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;
1677 #ifdef EXPERIMENTAL_DMARC
1679 #endif /* EXPERIMENTAL_DMARC */
1681 /* Variables for use when building the Received: header. */
1687 /* Release any open files that might have been cached while preparing to
1688 accept the message - e.g. by verifying addresses - because reading a message
1689 might take a fair bit of real time. */
1693 /* Extracting the recipient list from an input file is incompatible with
1694 cutthrough delivery with the no-spool option. It shouldn't be possible
1695 to set up the combination, but just in case kill any ongoing connection. */
1696 if (extract_recip || !smtp_input)
1697 cancel_cutthrough_connection(TRUE, US"not smtp input");
1699 /* Initialize the chain of headers by setting up a place-holder for Received:
1700 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1701 pointing to the end of the chain to make adding headers simple. */
1703 received_header = header_list = header_last = store_get(sizeof(header_line));
1704 header_list->next = NULL;
1705 header_list->type = htype_old;
1706 header_list->text = NULL;
1707 header_list->slen = 0;
1709 /* Control block for the next header to be read. */
1711 next = store_get(sizeof(header_line));
1712 next->text = store_get(header_size);
1714 /* Initialize message id to be null (indicating no message read), and the
1715 header names list to be the normal list. Indicate there is no data file open
1716 yet, initialize the size and warning count, and deal with no size limit. */
1719 spool_data_file = NULL;
1724 received_count = 1; /* For the one we will add */
1726 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1728 /* While reading the message, the following counts are computed. */
1730 message_linecount = body_linecount = body_zerocount =
1731 max_received_linelength = 0;
1733 #ifndef DISABLE_DKIM
1734 /* Call into DKIM to set up the context. In CHUNKING mode
1735 we clear the dot-stuffing flag */
1736 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1737 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1740 #ifdef EXPERIMENTAL_DMARC
1741 /* initialize libopendmarc */
1742 dmarc_up = dmarc_init();
1745 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1746 ids, and fractions of a second are required. See the comments that precede the
1747 message id creation below. */
1749 (void)gettimeofday(&message_id_tv, NULL);
1751 /* For other uses of the received time we can operate with granularity of one
1752 second, and for that we use the global variable received_time. This is for
1753 things like ultimate message timeouts. */
1755 received_time = message_id_tv;
1757 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1758 happen in the smtp_getc() function when it refills its buffer. */
1760 had_data_timeout = 0;
1762 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1764 /* If not SMTP input, timeout happens only if configured, and we just set a
1765 single timeout for the whole message. */
1767 else if (receive_timeout > 0)
1769 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1770 ALARM(receive_timeout);
1773 /* SIGTERM and SIGINT are caught always. */
1775 had_data_sigint = 0;
1776 signal(SIGTERM, data_sigterm_sigint_handler);
1777 signal(SIGINT, data_sigterm_sigint_handler);
1779 /* Header lines in messages are not supposed to be very long, though when
1780 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1781 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1782 storing the header, and extend this as necessary using string_cat().
1784 To cope with total lunacies, impose an upper limit on the length of the header
1785 section of the message, as otherwise the store will fill up. We must also cope
1786 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1787 Folded header lines are joined into one string, leaving the '\n' characters
1788 inside them, so that writing them out reproduces the input.
1790 Loop for each character of each header; the next structure for chaining the
1791 header is set up already, with ptr the offset of the next character in
1796 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1798 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1799 SMTP must have a correct "." terminator. */
1801 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1803 smtp_reply = handle_lost_connection(US" (header)");
1805 goto TIDYUP; /* Skip to end of function */
1808 /* See if we are at the current header's size limit - there must be at least
1809 four bytes left. This allows for the new character plus a zero, plus two for
1810 extra insertions when we are playing games with dots and carriage returns. If
1811 we are at the limit, extend the text buffer. This could have been done
1812 automatically using string_cat() but because this is a tightish loop storing
1813 only one character at a time, we choose to do it inline. Normally
1814 store_extend() will be able to extend the block; only at the end of a big
1815 store block will a copy be needed. To handle the case of very long headers
1816 (and sometimes lunatic messages can have ones that are 100s of K long) we
1817 call store_release() for strings that have been copied - if the string is at
1818 the start of a block (and therefore the only thing in it, because we aren't
1819 doing any other gets), the block gets freed. We can only do this release if
1820 there were no allocations since the once that we want to free. */
1822 if (ptr >= header_size - 4)
1824 int oldsize = header_size;
1826 if (header_size >= INT_MAX/2)
1830 if (!store_extend(next->text, oldsize, header_size))
1831 next->text = store_newblock(next->text, header_size, ptr);
1834 /* Cope with receiving a binary zero. There is dispute about whether
1835 these should be allowed in RFC 822 messages. The middle view is that they
1836 should not be allowed in headers, at least. Exim takes this attitude at
1837 the moment. We can't just stomp on them here, because we don't know that
1838 this line is a header yet. Set a flag to cause scanning later. */
1840 if (ch == 0) had_zero++;
1842 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1843 those from data files use just LF. Treat LF in local SMTP input as a
1844 terminator too. Treat EOF as a line terminator always. */
1846 if (ch == EOF) goto EOL;
1848 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1849 other MTAs accept this. We are therefore forced into this "liberalisation"
1850 too, so we accept LF as a line terminator whatever the source of the message.
1851 However, if the first line of the message ended with a CRLF, we treat a bare
1852 LF specially by inserting a white space after it to ensure that the header
1853 line is not terminated. */
1857 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1858 else if (first_line_ended_crlf) receive_ungetc(' ');
1862 /* This is not the end of the line. If this is SMTP input and this is
1863 the first character in the line and it is a "." character, ignore it.
1864 This implements the dot-doubling rule, though header lines starting with
1865 dots aren't exactly common. They are legal in RFC 822, though. If the
1866 following is CRLF or LF, this is the line that that terminates the
1867 entire message. We set message_ended to indicate this has happened (to
1868 prevent further reading), and break out of the loop, having freed the
1869 empty header, and set next = NULL to indicate no data line. */
1871 if (ptr == 0 && ch == '.' && f.dot_ends)
1873 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1876 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1880 ch = '\r'; /* Revert to CR */
1885 message_ended = END_DOT;
1888 break; /* End character-reading loop */
1891 /* For non-SMTP input, the dot at the start of the line was really a data
1892 character. What is now in ch is the following character. We guaranteed
1893 enough space for this above. */
1897 next->text[ptr++] = '.';
1902 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1903 remember this case if this is the first line ending. */
1907 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1910 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1914 /* Otherwise, put back the character after CR, and turn the bare CR
1917 ch = (receive_ungetc)(ch);
1918 next->text[ptr++] = '\n';
1923 /* We have a data character for the header line. */
1925 next->text[ptr++] = ch; /* Add to buffer */
1926 message_size++; /* Total message size so far */
1928 /* Handle failure due to a humungously long header section. The >= allows
1929 for the terminating \n. Add what we have so far onto the headers list so
1930 that it gets reflected in any error message, and back up the just-read
1933 if (message_size >= header_maxsize)
1936 next->text[ptr] = 0;
1938 next->type = htype_other;
1940 header_last->next = next;
1943 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1944 "%s (more than %d characters): message abandoned",
1945 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1949 smtp_reply = US"552 Message header is ridiculously long";
1950 receive_swallow_smtp();
1951 goto TIDYUP; /* Skip to end of function */
1956 give_local_error(ERRMESS_VLONGHEADER,
1957 string_sprintf("message header longer than %d characters received: "
1958 "message not accepted", header_maxsize), US"", error_rc, stdin,
1960 /* Does not return */
1964 continue; /* With next input character */
1966 /* End of header line reached */
1970 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1972 receive_linecount++;
1973 message_linecount++;
1975 /* Keep track of maximum line length */
1977 if (ptr - prevlines_length > max_received_linelength)
1978 max_received_linelength = ptr - prevlines_length;
1979 prevlines_length = ptr + 1;
1981 /* Now put in the terminating newline. There is always space for
1982 at least two more characters. */
1984 next->text[ptr++] = '\n';
1987 /* A blank line signals the end of the headers; release the unwanted
1988 space and set next to NULL to indicate this. */
1997 /* There is data in the line; see if the next input character is a
1998 whitespace character. If it is, we have a continuation of this header line.
1999 There is always space for at least one character at this point. */
2003 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2004 if (nextch == ' ' || nextch == '\t')
2006 next->text[ptr++] = nextch;
2007 if (++message_size >= header_maxsize)
2009 continue; /* Iterate the loop */
2011 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2012 else ch = EOF; /* Cause main loop to exit at end */
2015 /* We have got to the real line end. Terminate the string and release store
2016 beyond it. If it turns out to be a real header, internal binary zeros will
2017 be squashed later. */
2019 next->text[ptr] = 0;
2021 store_reset(next->text + ptr + 1);
2023 /* Check the running total size against the overall message size limit. We
2024 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2025 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2026 headers - the code to read the body will then also hit the buffer. */
2028 if (message_size > thismessage_size_limit) break;
2030 /* A line that is not syntactically correct for a header also marks
2031 the end of the headers. In this case, we leave next containing the
2032 first data line. This might actually be several lines because of the
2033 continuation logic applied above, but that doesn't matter.
2035 It turns out that smail, and presumably sendmail, accept leading lines
2038 From ph10 Fri Jan 5 12:35 GMT 1996
2040 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2041 find any documentation of this, but for compatibility it had better be
2042 accepted. Exim restricts it to the case of non-smtp messages, and
2043 treats it as an alternative to the -f command line option. Thus it is
2044 ignored except for trusted users or filter testing. Otherwise it is taken
2045 as the sender address, unless -f was used (sendmail compatibility).
2047 It further turns out that some UUCPs generate the From_line in a different
2050 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2052 The regex for matching these things is now capable of recognizing both
2053 formats (including 2- and 4-digit years in the latter). In fact, the regex
2054 is now configurable, as is the expansion string to fish out the sender.
2056 Even further on it has been discovered that some broken clients send
2057 these lines in SMTP messages. There is now an option to ignore them from
2058 specified hosts or networks. Sigh. */
2060 if ( header_last == header_list
2062 || ( sender_host_address
2063 && verify_check_host(&ignore_fromline_hosts) == OK
2065 || (!sender_host_address && ignore_fromline_local)
2067 && regex_match_and_setup(regex_From, next->text, 0, -1)
2070 if (!f.sender_address_forced)
2072 uschar *uucp_sender = expand_string(uucp_from_sender);
2074 log_write(0, LOG_MAIN|LOG_PANIC,
2075 "expansion of \"%s\" failed after matching "
2076 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2079 int start, end, domain;
2081 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2082 &start, &end, &domain, TRUE);
2085 if (domain == 0 && newsender[0] != 0)
2086 newsender = rewrite_address_qualify(newsender, FALSE);
2088 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2090 sender_address = newsender;
2092 if (f.trusted_caller || filter_test != FTEST_NONE)
2094 authenticated_sender = NULL;
2095 originator_name = US"";
2096 f.sender_local = FALSE;
2099 if (filter_test != FTEST_NONE)
2100 printf("Sender taken from \"From \" line\n");
2107 /* Not a leading "From " line. Check to see if it is a valid header line.
2108 Header names may contain any non-control characters except space and colon,
2113 uschar *p = next->text;
2115 /* If not a valid header line, break from the header reading loop, leaving
2116 next != NULL, indicating that it holds the first line of the body. */
2118 if (isspace(*p)) break;
2119 while (mac_isgraph(*p) && *p != ':') p++;
2120 while (isspace(*p)) p++;
2123 body_zerocount = had_zero;
2127 /* We have a valid header line. If there were any binary zeroes in
2128 the line, stomp on them here. */
2131 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2134 /* It is perfectly legal to have an empty continuation line
2135 at the end of a header, but it is confusing to humans
2136 looking at such messages, since it looks like a blank line.
2137 Reduce confusion by removing redundant white space at the
2138 end. We know that there is at least one printing character
2139 (the ':' tested for above) so there is no danger of running
2142 p = next->text + ptr - 2;
2145 while (*p == ' ' || *p == '\t') p--;
2146 if (*p != '\n') break;
2147 ptr = (p--) - next->text + 1;
2148 message_size -= next->slen - ptr;
2149 next->text[ptr] = 0;
2153 /* Add the header to the chain */
2155 next->type = htype_other;
2157 header_last->next = next;
2160 /* Check the limit for individual line lengths. This comes after adding to
2161 the chain so that the failing line is reflected if a bounce is generated
2162 (for a local message). */
2164 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2166 log_write(0, LOG_MAIN, "overlong message header line received from "
2167 "%s (more than %d characters): message abandoned",
2168 f.sender_host_unknown ? sender_ident : sender_fullhost,
2169 header_line_maxsize);
2173 smtp_reply = US"552 A message header line is too long";
2174 receive_swallow_smtp();
2175 goto TIDYUP; /* Skip to end of function */
2179 give_local_error(ERRMESS_VLONGHDRLINE,
2180 string_sprintf("message header line longer than %d characters "
2181 "received: message not accepted", header_line_maxsize), US"",
2182 error_rc, stdin, header_list->next);
2183 /* Does not return */
2186 /* Note if any resent- fields exist. */
2188 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2190 resents_exist = TRUE;
2191 resent_prefix = US"Resent-";
2195 /* Reject CHUNKING messages that do not CRLF their first header line */
2197 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2199 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2200 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2202 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2203 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2204 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2207 goto TIDYUP; /* Skip to end of function */
2210 /* The line has been handled. If we have hit EOF, break out of the loop,
2211 indicating no pending data line. */
2213 if (ch == EOF) { next = NULL; break; }
2215 /* Set up for the next header */
2218 next = store_get(sizeof(header_line));
2219 next->text = store_get(header_size);
2222 prevlines_length = 0;
2223 } /* Continue, starting to read the next header */
2225 /* At this point, we have read all the headers into a data structure in main
2226 store. The first header is still the dummy placeholder for the Received: header
2227 we are going to generate a bit later on. If next != NULL, it contains the first
2228 data line - which terminated the headers before reaching a blank line (not the
2233 debug_printf(">>Headers received:\n");
2234 for (header_line * h = header_list->next; h; h = h->next)
2235 debug_printf("%s", h->text);
2239 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2240 is dropped immediately after valid headers, the next thing we will see is EOF.
2241 We must test for this specially, as further down the reading of the data is
2242 skipped if already at EOF. */
2244 if (smtp_input && (receive_feof)())
2246 smtp_reply = handle_lost_connection(US" (after header)");
2248 goto TIDYUP; /* Skip to end of function */
2251 /* If this is a filter test run and no headers were read, output a warning
2252 in case there is a mistake in the test message. */
2254 if (filter_test != FTEST_NONE && header_list->next == NULL)
2255 printf("Warning: no message headers read\n");
2258 /* Scan the headers to identify them. Some are merely marked for later
2259 processing; some are dealt with here. */
2261 for (header_line * h = header_list->next; h; h = h->next)
2263 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2264 if (is_resent) contains_resent_headers = TRUE;
2266 switch (header_checkname(h, is_resent))
2269 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2273 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2276 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2279 if (!resents_exist || is_resent) date_header_exists = TRUE;
2282 /* Same comments as about Return-Path: below. */
2284 case htype_delivery_date:
2285 if (delivery_date_remove) h->type = htype_old;
2288 /* Same comments as about Return-Path: below. */
2290 case htype_envelope_to:
2291 if (envelope_to_remove) h->type = htype_old;
2294 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2295 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2296 header consists of just the login id of the user who called Exim, rewrite
2297 it with the gecos field first. Apply this rule to Resent-From: if there
2298 are resent- fields. */
2301 h->type = htype_from;
2302 if (!resents_exist || is_resent)
2308 uschar *s = Ustrchr(h->text, ':') + 1;
2309 while (isspace(*s)) s++;
2310 len = h->slen - (s - h->text) - 1;
2311 if (Ustrlen(originator_login) == len &&
2312 strncmpic(s, originator_login, len) == 0)
2314 uschar *name = is_resent? US"Resent-From" : US"From";
2315 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2316 originator_login, qualify_domain_sender);
2317 from_header = header_last;
2318 h->type = htype_old;
2319 DEBUG(D_receive|D_rewrite)
2320 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2326 /* Identify the Message-id: header for generating "in-reply-to" in the
2327 autoreply transport. For incoming logging, save any resent- value. In both
2328 cases, take just the first of any multiples. */
2331 if (!msgid_header && (!resents_exist || is_resent))
2338 /* Flag all Received: headers */
2340 case htype_received:
2341 h->type = htype_received;
2345 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2347 case htype_reply_to:
2348 h->type = htype_reply_to;
2351 /* The Return-path: header is supposed to be added to messages when
2352 they leave the SMTP system. We shouldn't receive messages that already
2353 contain Return-path. However, since Exim generates Return-path: on
2354 local delivery, resent messages may well contain it. We therefore
2355 provide an option (which defaults on) to remove any Return-path: headers
2356 on input. Removal actually means flagging as "old", which prevents the
2357 header being transmitted with the message. */
2359 case htype_return_path:
2360 if (return_path_remove) h->type = htype_old;
2362 /* If we are testing a mail filter file, use the value of the
2363 Return-Path: header to set up the return_path variable, which is not
2364 otherwise set. However, remove any <> that surround the address
2365 because the variable doesn't have these. */
2367 if (filter_test != FTEST_NONE)
2369 uschar *start = h->text + 12;
2370 uschar *end = start + Ustrlen(start);
2371 while (isspace(*start)) start++;
2372 while (end > start && isspace(end[-1])) end--;
2373 if (*start == '<' && end[-1] == '>')
2378 return_path = string_copyn(start, end - start);
2379 printf("Return-path taken from \"Return-path:\" header line\n");
2383 /* If there is a "Sender:" header and the message is locally originated,
2384 and from an untrusted caller and suppress_local_fixups is not set, or if we
2385 are in submission mode for a remote message, mark it "old" so that it will
2386 not be transmitted with the message, unless active_local_sender_retain is
2387 set. (This can only be true if active_local_from_check is false.) If there
2388 are any resent- headers in the message, apply this rule to Resent-Sender:
2389 instead of Sender:. Messages with multiple resent- header sets cannot be
2390 tidily handled. (For this reason, at least one MUA - Pine - turns old
2391 resent- headers into X-resent- headers when resending, leaving just one
2395 h->type = !f.active_local_sender_retain
2396 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2397 || f.submission_mode
2399 && (!resents_exist || is_resent)
2400 ? htype_old : htype_sender;
2403 /* Remember the Subject: header for logging. There is no Resent-Subject */
2409 /* "To:" gets flagged, and the existence of a recipient header is noted,
2410 whether it's resent- or not. */
2415 to_or_cc_header_exists = TRUE;
2421 /* Extract recipients from the headers if that is required (the -t option).
2422 Note that this is documented as being done *before* any address rewriting takes
2423 place. There are two possibilities:
2425 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2426 recipients already listed are to be REMOVED from the message. Smail 3 works
2427 like this. We need to build a non-recipients tree for that list, because in
2428 subsequent processing this data is held in a tree and that's what the
2429 spool_write_header() function expects. Make sure that non-recipient addresses
2430 are fully qualified and rewritten if necessary.
2432 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2433 those in the command line arguments (and it is rumoured some other MTAs do
2434 this). Therefore, there is an option to make Exim behave this way.
2436 *** Notes on "Resent-" header lines ***
2438 The presence of resent-headers in the message makes -t horribly ambiguous.
2439 Experiments with sendmail showed that it uses recipients for all resent-
2440 headers, totally ignoring the concept of "sets of resent- headers" as described
2441 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2442 with all the addresses in one instance of each header.
2444 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2445 error for -t if there were resent- headers in the message. However, after a
2446 discussion on the mailing list, I've learned that there are MUAs that use
2447 resent- headers with -t, and also that the stuff about sets of resent- headers
2448 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2449 message with -t and resent- header lines makes sure that only *its* resent-
2450 headers are present; previous ones are often renamed as X-resent- for example.
2452 Consequently, Exim has been changed so that, if any resent- header lines are
2453 present, the recipients are taken from all of the appropriate resent- lines,
2454 and not from the ordinary To:, Cc:, etc. */
2459 error_block **bnext = &bad_addresses;
2461 if (extract_addresses_remove_arguments)
2463 while (recipients_count-- > 0)
2465 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2466 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2467 tree_add_nonrecipient(s);
2469 recipients_list = NULL;
2470 recipients_count = recipients_list_max = 0;
2473 /* Now scan the headers */
2475 for (header_line * h = header_list->next; h; h = h->next)
2477 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2478 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2480 uschar *s = Ustrchr(h->text, ':') + 1;
2481 while (isspace(*s)) s++;
2483 f.parse_allow_group = TRUE; /* Allow address group syntax */
2487 uschar *ss = parse_find_address_end(s, FALSE);
2488 uschar *recipient, *errmess, *pp;
2489 int start, end, domain;
2491 /* Check on maximum */
2493 if (recipients_max > 0 && ++rcount > recipients_max)
2494 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2495 US"message rejected: ", error_rc, stdin, NULL);
2496 /* Does not return */
2498 /* Make a copy of the address, and remove any internal newlines. These
2499 may be present as a result of continuations of the header line. The
2500 white space that follows the newline must not be removed - it is part
2503 pp = recipient = store_get(ss - s + 1);
2504 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2509 BOOL b = allow_utf8_domains;
2510 allow_utf8_domains = TRUE;
2512 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2516 if (string_is_utf8(recipient))
2517 message_smtputf8 = TRUE;
2519 allow_utf8_domains = b;
2523 /* Keep a list of all the bad addresses so we can send a single
2524 error message at the end. However, an empty address is not an error;
2525 just ignore it. This can come from an empty group list like
2527 To: Recipients of list:;
2529 If there are no recipients at all, an error will occur later. */
2531 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2533 int len = Ustrlen(s);
2534 error_block *b = store_get(sizeof(error_block));
2535 while (len > 0 && isspace(s[len-1])) len--;
2537 b->text1 = string_printing(string_copyn(s, len));
2543 /* If the recipient is already in the nonrecipients tree, it must
2544 have appeared on the command line with the option extract_addresses_
2545 remove_arguments set. Do not add it to the recipients, and keep a note
2546 that this has happened, in order to give a better error if there are
2547 no recipients left. */
2549 else if (recipient != NULL)
2551 if (tree_search(tree_nonrecipients, recipient) == NULL)
2552 receive_add_recipient(recipient, -1);
2554 extracted_ignored = TRUE;
2557 /* Move on past this address */
2559 s = ss + (*ss? 1:0);
2560 while (isspace(*s)) s++;
2561 } /* Next address */
2563 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2564 f.parse_found_group = FALSE;
2566 /* If this was the bcc: header, mark it "old", which means it
2567 will be kept on the spool, but not transmitted as part of the
2570 if (h->type == htype_bcc) h->type = htype_old;
2571 } /* For appropriate header line */
2572 } /* For each header line */
2576 /* Now build the unique message id. This has changed several times over the
2577 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2578 Retaining all the history in the comment has become too unwieldy - read
2579 previous release sources if you want it.
2581 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2582 The first part is the current time, in seconds. The second part is the current
2583 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2584 can hold a number in the range 0-3843. It used to be a computed sequence
2585 number, but is now the fractional component of the current time in units of
2586 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2587 received, Exim ensures that the timer has ticked at the appropriate level
2588 before proceeding, to avoid duplication if the pid happened to be re-used
2589 within the same time period. It seems likely that most messages will take at
2590 least half a millisecond to be received, so no delay will normally be
2591 necessary. At least for some time...
2593 There is a modification when localhost_number is set. Formerly this was allowed
2594 to be as large as 255. Now it is restricted to the range 0-16, and the final
2595 component of the message id becomes (localhost_number * 200) + fractional time
2596 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2598 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2599 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2600 still allows the tttttt field to hold a large enough number to last for some
2601 more decades, and the final two-digit field can hold numbers up to 1295, which
2602 is enough for milliseconds (instead of 1/2000 of a second).
2604 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2605 pid, so it is probably safe because pids have to be positive. The
2606 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2607 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2609 Note that string_base62() returns its data in a static storage block, so it
2610 must be copied before calling string_base62() again. It always returns exactly
2613 There doesn't seem to be anything in the RFC which requires a message id to
2614 start with a letter, but Smail was changed to ensure this. The external form of
2615 the message id (as supplied by string expansion) therefore starts with an
2616 additional leading 'E'. The spool file names do not include this leading
2617 letter and it is not used internally.
2619 NOTE: If ever the format of message ids is changed, the regular expression for
2620 checking that a string is in this format must be updated in a corresponding
2621 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2622 must also be changed to reflect the correct string length. The queue-sort code
2623 needs to know the layout. Then, of course, other programs that rely on the
2624 message id format will need updating too. */
2626 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2627 message_id[6] = '-';
2628 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2630 /* Deal with the case where the host number is set. The value of the number was
2631 checked when it was read, to ensure it isn't too big. The timing granularity is
2632 left in id_resolution so that an appropriate wait can be done after receiving
2633 the message, if necessary (we hope it won't be). */
2635 if (host_number_string)
2637 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2638 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2639 string_base62((long int)(
2640 host_number * (1000000/id_resolution) +
2641 message_id_tv.tv_usec/id_resolution)) + 4);
2644 /* Host number not set: final field is just the fractional time at an
2645 appropriate resolution. */
2649 id_resolution = BASE_62 == 62 ? 500 : 1000;
2650 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2651 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2654 /* Add the current message id onto the current process info string if
2657 (void)string_format(process_info + process_info_len,
2658 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2660 /* If we are using multiple input directories, set up the one for this message
2661 to be the least significant base-62 digit of the time of arrival. Otherwise
2662 ensure that it is an empty string. */
2664 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2666 /* Now that we have the message-id, if there is no message-id: header, generate
2667 one, but only for local (without suppress_local_fixups) or submission mode
2668 messages. This can be user-configured if required, but we had better flatten
2669 any illegal characters therein. */
2672 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2674 uschar *id_text = US"";
2675 uschar *id_domain = primary_hostname;
2677 /* Permit only letters, digits, dots, and hyphens in the domain */
2679 if (message_id_domain)
2681 uschar *new_id_domain = expand_string(message_id_domain);
2684 if (!f.expand_string_forcedfail)
2685 log_write(0, LOG_MAIN|LOG_PANIC,
2686 "expansion of \"%s\" (message_id_header_domain) "
2687 "failed: %s", message_id_domain, expand_string_message);
2689 else if (*new_id_domain)
2691 id_domain = new_id_domain;
2692 for (uschar * p = id_domain; *p; p++)
2693 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2697 /* Permit all characters except controls and RFC 2822 specials in the
2698 additional text part. */
2700 if (message_id_text)
2702 uschar *new_id_text = expand_string(message_id_text);
2705 if (!f.expand_string_forcedfail)
2706 log_write(0, LOG_MAIN|LOG_PANIC,
2707 "expansion of \"%s\" (message_id_header_text) "
2708 "failed: %s", message_id_text, expand_string_message);
2710 else if (*new_id_text)
2712 id_text = new_id_text;
2713 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2717 /* Add the header line
2718 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2719 * appended, to preserve classical expectations of header ordering. */
2721 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2722 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2723 (*id_text == 0)? "" : ".", id_text, id_domain);
2726 /* If we are to log recipients, keep a copy of the raw ones before any possible
2727 rewriting. Must copy the count, because later ACLs and the local_scan()
2728 function may mess with the real recipients. */
2730 if (LOGGING(received_recipients))
2732 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2733 for (int i = 0; i < recipients_count; i++)
2734 raw_recipients[i] = string_copy(recipients_list[i].address);
2735 raw_recipients_count = recipients_count;
2738 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2739 recipients will get here only if the conditions were right (allow_unqualified_
2740 recipient is TRUE). */
2742 for (int i = 0; i < recipients_count; i++)
2743 recipients_list[i].address =
2744 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2745 global_rewrite_rules, rewrite_existflags);
2747 /* If there is no From: header, generate one for local (without
2748 suppress_local_fixups) or submission_mode messages. If there is no sender
2749 address, but the sender is local or this is a local delivery error, use the
2750 originator login. This shouldn't happen for genuine bounces, but might happen
2751 for autoreplies. The addition of From: must be done *before* checking for the
2752 possible addition of a Sender: header, because untrusted_set_sender allows an
2753 untrusted user to set anything in the envelope (which might then get info
2754 From:) but we still want to ensure a valid Sender: if it is required. */
2757 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2759 uschar *oname = US"";
2761 /* Use the originator_name if this is a locally submitted message and the
2762 caller is not trusted. For trusted callers, use it only if -F was used to
2763 force its value or if we have a non-SMTP message for which -f was not used
2764 to set the sender. */
2766 if (!sender_host_address)
2768 if (!f.trusted_caller || f.sender_name_forced ||
2769 (!smtp_input && !f.sender_address_forced))
2770 oname = originator_name;
2773 /* For non-locally submitted messages, the only time we use the originator
2774 name is when it was forced by the /name= option on control=submission. */
2776 else if (submission_name) oname = submission_name;
2778 /* Envelope sender is empty */
2780 if (!*sender_address)
2782 uschar *fromstart, *fromend;
2784 fromstart = string_sprintf("%sFrom: %s%s",
2785 resent_prefix, oname, *oname ? " <" : "");
2786 fromend = *oname ? US">" : US"";
2788 if (f.sender_local || f.local_error_message)
2789 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2790 local_part_quote(originator_login), qualify_domain_sender,
2793 else if (f.submission_mode && authenticated_id)
2795 if (!submission_domain)
2796 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2797 local_part_quote(authenticated_id), qualify_domain_sender,
2800 else if (!*submission_domain) /* empty => whole address set */
2801 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2805 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2806 local_part_quote(authenticated_id), submission_domain, fromend);
2808 from_header = header_last; /* To get it checked for Sender: */
2812 /* There is a non-null envelope sender. Build the header using the original
2813 sender address, before any rewriting that might have been done while
2818 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2821 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2824 from_header = header_last; /* To get it checked for Sender: */
2829 /* If the sender is local (without suppress_local_fixups), or if we are in
2830 submission mode and there is an authenticated_id, check that an existing From:
2831 is correct, and if not, generate a Sender: header, unless disabled. Any
2832 previously-existing Sender: header was removed above. Note that sender_local,
2833 as well as being TRUE if the caller of exim is not trusted, is also true if a
2834 trusted caller did not supply a -f argument for non-smtp input. To allow
2835 trusted callers to forge From: without supplying -f, we have to test explicitly
2836 here. If the From: header contains more than one address, then the call to
2837 parse_extract_address fails, and a Sender: header is inserted, as required. */
2840 && ( f.active_local_from_check
2841 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2842 || f.submission_mode && authenticated_id
2845 BOOL make_sender = TRUE;
2846 int start, end, domain;
2848 uschar *from_address =
2849 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2850 &start, &end, &domain, FALSE);
2851 uschar *generated_sender_address;
2853 generated_sender_address = f.submission_mode
2854 ? !submission_domain
2855 ? string_sprintf("%s@%s",
2856 local_part_quote(authenticated_id), qualify_domain_sender)
2857 : !*submission_domain /* empty => full address */
2858 ? string_sprintf("%s", authenticated_id)
2859 : string_sprintf("%s@%s",
2860 local_part_quote(authenticated_id), submission_domain)
2861 : string_sprintf("%s@%s",
2862 local_part_quote(originator_login), qualify_domain_sender);
2864 /* Remove permitted prefixes and suffixes from the local part of the From:
2865 address before doing the comparison with the generated sender. */
2870 uschar *at = domain ? from_address + domain - 1 : NULL;
2873 from_address += route_check_prefix(from_address, local_from_prefix);
2874 slen = route_check_suffix(from_address, local_from_suffix);
2877 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2878 from_address += slen;
2882 if ( strcmpic(generated_sender_address, from_address) == 0
2883 || (!domain && strcmpic(from_address, originator_login) == 0))
2884 make_sender = FALSE;
2887 /* We have to cause the Sender header to be rewritten if there are
2888 appropriate rewriting rules. */
2891 if (f.submission_mode && !submission_name)
2892 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2893 generated_sender_address);
2895 header_add(htype_sender, "%sSender: %s <%s>\n",
2897 f.submission_mode ? submission_name : originator_name,
2898 generated_sender_address);
2900 /* Ensure that a non-null envelope sender address corresponds to the
2901 submission mode sender address. */
2903 if (f.submission_mode && *sender_address)
2905 if (!sender_address_unrewritten)
2906 sender_address_unrewritten = sender_address;
2907 sender_address = generated_sender_address;
2908 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2909 log_write(L_address_rewrite, LOG_MAIN,
2910 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2911 sender_address_unrewritten, generated_sender_address);
2915 /* If there are any rewriting rules, apply them to the sender address, unless
2916 it has already been rewritten as part of verification for SMTP input. */
2918 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2920 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2921 global_rewrite_rules, rewrite_existflags);
2922 DEBUG(D_receive|D_rewrite)
2923 debug_printf("rewritten sender = %s\n", sender_address);
2927 /* The headers must be run through rewrite_header(), because it ensures that
2928 addresses are fully qualified, as well as applying any rewriting rules that may
2931 Qualification of header addresses in a message from a remote host happens only
2932 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2933 appropriate. For local messages, qualification always happens, unless -bnq is
2934 used to explicitly suppress it. No rewriting is done for an unqualified address
2935 that is left untouched.
2937 We start at the second header, skipping our own Received:. This rewriting is
2938 documented as happening *after* recipient addresses are taken from the headers
2939 by the -t command line option. An added Sender: gets rewritten here. */
2941 for (header_line * h = header_list->next; h; h = h->next)
2943 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2944 rewrite_existflags, TRUE);
2949 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2950 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2951 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2952 exists, this applies to the set of resent- headers rather than the normal set.
2954 The requirement for a recipient header has been removed in RFC 2822. At this
2955 point in the code, earlier versions of Exim added a To: header for locally
2956 submitted messages, and an empty Bcc: header for others. In the light of the
2957 changes in RFC 2822, this was dropped in November 2003. */
2960 /* If there is no date header, generate one if the message originates locally
2961 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2962 submission mode flag is set. Messages without Date: are not valid, but it seems
2963 to be more confusing if Exim adds one to all remotely-originated messages.
2964 As per Message-Id, we prepend if resending, else append.
2967 if ( !date_header_exists
2968 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2969 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2970 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2972 search_tidyup(); /* Free any cached resources */
2974 /* Show the complete set of headers if debugging. Note that the first one (the
2975 new Received:) has not yet been set. */
2979 debug_printf(">>Headers after rewriting and local additions:\n");
2980 for (header_line * h = header_list->next; h; h = h->next)
2981 debug_printf("%c %s", h->type, h->text);
2985 /* The headers are now complete in store. If we are running in filter
2986 testing mode, that is all this function does. Return TRUE if the message
2987 ended with a dot. */
2989 if (filter_test != FTEST_NONE)
2991 process_info[process_info_len] = 0;
2992 return message_ended == END_DOT;
2995 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2996 think more if it could be handled. Cannot do onward CHUNKING unless
2997 inbound is, but inbound chunking ought to be ok with outbound plain.
2998 Could we do onward CHUNKING given inbound CHUNKING?
3000 if (chunking_state > CHUNKING_OFFERED)
3001 cancel_cutthrough_connection(FALSE, US"chunking active");
3003 /* Cutthrough delivery:
3004 We have to create the Received header now rather than at the end of reception,
3005 so the timestamp behaviour is a change to the normal case.
3006 Having created it, send the headers to the destination. */
3008 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3010 if (received_count > received_headers_max)
3012 cancel_cutthrough_connection(TRUE, US"too many headers");
3013 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3014 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3015 "Too many \"Received\" headers",
3017 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3018 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3019 message_id[0] = 0; /* Indicate no message accepted */
3020 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3021 goto TIDYUP; /* Skip to end of function */
3023 received_header_gen();
3024 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3025 (void) cutthrough_headers_send();
3029 /* Open a new spool file for the data portion of the message. We need
3030 to access it both via a file descriptor and a stream. Try to make the
3031 directory if it isn't there. */
3033 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3034 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3036 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3038 if (errno == ENOENT)
3040 (void) directory_make(spool_directory,
3041 spool_sname(US"input", message_subdir),
3042 INPUT_DIRECTORY_MODE, TRUE);
3043 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3046 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3047 spool_name, strerror(errno));
3050 /* Make sure the file's group is the Exim gid, and double-check the mode
3051 because the group setting doesn't always get set automatically. */
3053 if (fchown(data_fd, exim_uid, exim_gid))
3054 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3055 "Failed setting ownership on spool file %s: %s",
3056 spool_name, strerror(errno));
3057 (void)fchmod(data_fd, SPOOL_MODE);
3059 /* We now have data file open. Build a stream for it and lock it. We lock only
3060 the first line of the file (containing the message ID) because otherwise there
3061 are problems when Exim is run under Cygwin (I'm told). See comments in
3062 spool_in.c, where the same locking is done. */
3064 spool_data_file = fdopen(data_fd, "w+");
3065 lock_data.l_type = F_WRLCK;
3066 lock_data.l_whence = SEEK_SET;
3067 lock_data.l_start = 0;
3068 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3070 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3071 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3072 errno, strerror(errno));
3074 /* We have an open, locked data file. Write the message id to it to make it
3075 self-identifying. Then read the remainder of the input of this message and
3076 write it to the data file. If the variable next != NULL, it contains the first
3077 data line (which was read as a header but then turned out not to have the right
3078 format); write it (remembering that it might contain binary zeros). The result
3079 of fwrite() isn't inspected; instead we call ferror() below. */
3081 fprintf(spool_data_file, "%s-D\n", message_id);
3084 uschar *s = next->text;
3085 int len = next->slen;
3086 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3087 body_linecount++; /* Assumes only 1 line */
3090 /* Note that we might already be at end of file, or the logical end of file
3091 (indicated by '.'), or might have encountered an error while writing the
3092 message id or "next" line. */
3094 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3098 message_ended = chunking_state <= CHUNKING_OFFERED
3099 ? read_message_data_smtp(spool_data_file)
3101 ? read_message_bdat_smtp_wire(spool_data_file)
3102 : read_message_bdat_smtp(spool_data_file);
3103 receive_linecount++; /* The terminating "." line */
3106 message_ended = read_message_data(spool_data_file);
3108 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3109 message_linecount += body_linecount;
3111 switch (message_ended)
3113 /* Handle premature termination of SMTP */
3118 Uunlink(spool_name); /* Lose data file when closed */
3119 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3120 message_id[0] = 0; /* Indicate no message accepted */
3121 smtp_reply = handle_lost_connection(US"");
3123 goto TIDYUP; /* Skip to end of function */
3127 /* Handle message that is too big. Don't use host_or_ident() in the log
3128 message; we want to see the ident value even for non-remote messages. */
3131 Uunlink(spool_name); /* Lose the data file when closed */
3132 cancel_cutthrough_connection(TRUE, US"mail too big");
3133 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3135 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3136 "message too big: read=%d max=%d",
3138 sender_fullhost ? " H=" : "",
3139 sender_fullhost ? sender_fullhost : US"",
3140 sender_ident ? " U=" : "",
3141 sender_ident ? sender_ident : US"",
3143 thismessage_size_limit);
3147 smtp_reply = US"552 Message size exceeds maximum permitted";
3148 message_id[0] = 0; /* Indicate no message accepted */
3149 goto TIDYUP; /* Skip to end of function */
3153 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3154 give_local_error(ERRMESS_TOOBIG,
3155 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3156 US"message rejected: ", error_rc, spool_data_file, header_list);
3157 /* Does not return */
3161 /* Handle bad BDAT protocol sequence */
3164 Uunlink(spool_name); /* Lose the data file when closed */
3165 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3166 smtp_reply = US""; /* Response already sent */
3167 message_id[0] = 0; /* Indicate no message accepted */
3168 goto TIDYUP; /* Skip to end of function */
3172 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3173 example, there may be some expansion in an ACL that uses a timer.) */
3175 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3177 /* The message body has now been read into the data file. Call fflush() to
3178 empty the buffers in C, and then call fsync() to get the data written out onto
3179 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3180 having to do this). If there was an I/O error on either input or output,
3181 attempt to send an error message, and unlink the spool file. For non-SMTP input
3182 we can then give up. Note that for SMTP input we must swallow the remainder of
3183 the input in cases of output errors, since the far end doesn't expect to see
3184 anything until the terminating dot line is sent. */
3186 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3187 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3189 uschar *msg_errno = US strerror(errno);
3190 BOOL input_error = (receive_ferror)() != 0;
3191 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3192 input_error? "Input read" : "Spool write",
3194 sender_fullhost ? sender_fullhost : sender_ident);
3196 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3197 Uunlink(spool_name); /* Lose the data file */
3198 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3203 smtp_reply = US"451 Error while reading input data";
3206 smtp_reply = US"451 Error while writing spool file";
3207 receive_swallow_smtp();
3209 message_id[0] = 0; /* Indicate no message accepted */
3210 goto TIDYUP; /* Skip to end of function */
3215 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3216 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3218 /* Does not return */
3223 /* No I/O errors were encountered while writing the data file. */
3225 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3226 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3229 /* If there were any bad addresses extracted by -t, or there were no recipients
3230 left after -t, send a message to the sender of this message, or write it to
3231 stderr if the error handling option is set that way. Note that there may
3232 legitimately be no recipients for an SMTP message if they have all been removed
3235 We need to rewind the data file in order to read it. In the case of no
3236 recipients or stderr error writing, throw the data file away afterwards, and
3237 exit. (This can't be SMTP, which always ensures there's at least one
3238 syntactically good recipient address.) */
3240 if (extract_recip && (bad_addresses || recipients_count == 0))
3244 if (recipients_count == 0) debug_printf("*** No recipients\n");
3247 debug_printf("*** Bad address(es)\n");
3248 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3249 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3253 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3254 message_id, bad_addresses ? "bad addresses" : "no recipients");
3256 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3258 /* If configured to send errors to the sender, but this fails, force
3259 a failure error code. We use a special one for no recipients so that it
3260 can be detected by the autoreply transport. Otherwise error_rc is set to
3261 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3262 it is EXIT_SUCCESS. */
3264 if (error_handling == ERRORS_SENDER)
3266 if (!moan_to_sender(
3268 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3269 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3270 bad_addresses, header_list, spool_data_file, FALSE
3272 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3277 if (extracted_ignored)
3278 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3280 fprintf(stderr, "exim: no recipients in message\n");
3283 fprintf(stderr, "exim: invalid address%s",
3284 bad_addresses->next ? "es:\n" : ":");
3285 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3286 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3287 bad_addresses->text2);
3291 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3293 Uunlink(spool_name);
3294 (void)fclose(spool_data_file);
3295 exim_exit(error_rc, US"receiving");
3299 /* Data file successfully written. Generate text for the Received: header by
3300 expanding the configured string, and adding a timestamp. By leaving this
3301 operation till now, we ensure that the timestamp is the time that message
3302 reception was completed. However, this is deliberately done before calling the
3303 data ACL and local_scan().
3305 This Received: header may therefore be inspected by the data ACL and by code in
3306 the local_scan() function. When they have run, we update the timestamp to be
3307 the final time of reception.
3309 If there is just one recipient, set up its value in the $received_for variable
3310 for use when we generate the Received: header.
3312 Note: the checking for too many Received: headers is handled by the delivery
3314 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3316 if (!received_header->text) /* Non-cutthrough case */
3318 received_header_gen();
3320 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3322 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3323 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3325 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3326 now, before running the DATA ACL. */
3328 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3331 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3332 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3334 /* If an ACL is specified for checking things at this stage of reception of a
3335 message, run it, unless all the recipients were removed by "discard" in earlier
3336 ACLs. That is the only case in which recipients_count can be zero at this
3337 stage. Set deliver_datafile to point to the data file so that $message_body and
3338 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3341 deliver_datafile = data_fd;
3344 f.enable_dollar_recipients = TRUE;
3346 if (recipients_count == 0)
3347 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3351 /* Handle interactive SMTP messages */
3353 if (smtp_input && !smtp_batched_input)
3356 #ifndef DISABLE_DKIM
3357 if (!f.dkim_disable_verify)
3359 /* Finish verification */
3360 dkim_exim_verify_finish();
3362 /* Check if we must run the DKIM ACL */
3363 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3365 uschar * dkim_verify_signers_expanded =
3366 expand_string(dkim_verify_signers);
3367 gstring * results = NULL;
3371 gstring * seen_items = NULL;
3372 int old_pool = store_pool;
3374 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3376 if (!(ptr = dkim_verify_signers_expanded))
3377 log_write(0, LOG_MAIN|LOG_PANIC,
3378 "expansion of dkim_verify_signers option failed: %s",
3379 expand_string_message);
3381 /* Default to OK when no items are present */
3383 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3385 /* Prevent running ACL for an empty item */
3386 if (!item || !*item) continue;
3388 /* Only run ACL once for each domain or identity,
3389 no matter how often it appears in the expanded list. */
3393 const uschar * seen_items_list = string_from_gstring(seen_items);
3395 BOOL seen_this_item = FALSE;
3397 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3399 if (Ustrcmp(seen_item,item) == 0)
3401 seen_this_item = TRUE;
3408 debug_printf("acl_smtp_dkim: skipping signer %s, "
3409 "already seen\n", item);
3413 seen_items = string_catn(seen_items, US":", 1);
3415 seen_items = string_cat(seen_items, item);
3417 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3421 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3422 "skipping remaining items\n", rc, item);
3423 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3427 dkim_verify_status = string_from_gstring(results);
3428 store_pool = old_pool;
3429 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3432 recipients_count = 0;
3433 blackholed_by = US"DKIM ACL";
3435 blackhole_log_msg = string_sprintf(": %s", log_msg);
3439 Uunlink(spool_name);
3440 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3441 smtp_yield = FALSE; /* No more messages after dropped connection */
3442 smtp_reply = US""; /* Indicate reply already sent */
3443 message_id[0] = 0; /* Indicate no message accepted */
3444 goto TIDYUP; /* Skip to end of function */
3448 dkim_exim_verify_log_all();
3450 #endif /* DISABLE_DKIM */
3452 #ifdef WITH_CONTENT_SCAN
3453 if ( recipients_count > 0
3455 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3458 #endif /* WITH_CONTENT_SCAN */
3460 #ifdef EXPERIMENTAL_DMARC
3461 dmarc_up = dmarc_store_data(from_header);
3462 #endif /* EXPERIMENTAL_DMARC */
3464 #ifndef DISABLE_PRDR
3465 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3468 int all_fail = FAIL;
3470 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3471 /* Loop through recipients, responses must be in same order received */
3472 for (unsigned int c = 0; recipients_count > c; c++)
3474 uschar * addr= recipients_list[c].address;
3475 uschar * msg= US"PRDR R=<%s> %s";
3478 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3479 addr, c+1, recipients_count);
3480 rc = acl_check(ACL_WHERE_PRDR, addr,
3481 acl_smtp_data_prdr, &user_msg, &log_msg);
3483 /* If any recipient rejected content, indicate it in final message */
3485 /* If all recipients rejected, indicate in final message */
3490 case OK: case DISCARD: code = US"250"; break;
3491 case DEFER: code = US"450"; break;
3492 default: code = US"550"; break;
3494 if (user_msg != NULL)
3495 smtp_user_msg(code, user_msg);
3500 case OK: case DISCARD:
3501 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3503 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3505 msg = string_sprintf(CS msg, addr, "refusal"); break;
3507 smtp_user_msg(code, msg);
3509 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3510 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3511 else log_write(0, LOG_MAIN, "%s", CS msg);
3513 if (rc != OK) { receive_remove_recipient(addr); c--; }
3515 /* Set up final message, used if data acl gives OK */
3516 smtp_reply = string_sprintf("%s id=%s message %s",
3517 all_fail == FAIL ? US"550" : US"250",
3520 ? US"rejected for all recipients"
3523 : US"accepted for some recipients");
3524 if (recipients_count == 0)
3526 message_id[0] = 0; /* Indicate no message accepted */
3531 prdr_requested = FALSE;
3532 #endif /* !DISABLE_PRDR */
3534 /* Check the recipients count again, as the MIME ACL might have changed
3537 if (acl_smtp_data != NULL && recipients_count > 0)
3539 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3540 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3543 recipients_count = 0;
3544 blackholed_by = US"DATA ACL";
3546 blackhole_log_msg = string_sprintf(": %s", log_msg);
3547 cancel_cutthrough_connection(TRUE, US"data acl discard");
3551 Uunlink(spool_name);
3552 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3553 #ifdef WITH_CONTENT_SCAN
3556 #ifdef EXPERIMENTAL_DCC
3559 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3560 smtp_yield = FALSE; /* No more messages after dropped connection */
3561 smtp_reply = US""; /* Indicate reply already sent */
3562 message_id[0] = 0; /* Indicate no message accepted */
3563 goto TIDYUP; /* Skip to end of function */
3568 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3569 we cannot take different actions for permanent and temporary rejections. */
3574 #ifdef WITH_CONTENT_SCAN
3575 if ( acl_not_smtp_mime
3576 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3580 #endif /* WITH_CONTENT_SCAN */
3584 uschar *user_msg, *log_msg;
3585 f.authentication_local = TRUE;
3586 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3589 recipients_count = 0;
3590 blackholed_by = US"non-SMTP ACL";
3592 blackhole_log_msg = string_sprintf(": %s", log_msg);
3596 Uunlink(spool_name);
3597 #ifdef WITH_CONTENT_SCAN
3600 #ifdef EXPERIMENTAL_DCC
3603 /* The ACL can specify where rejections are to be logged, possibly
3604 nowhere. The default is main and reject logs. */
3606 if (log_reject_target)
3607 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3608 sender_address, log_msg);
3610 if (!user_msg) user_msg = US"local configuration problem";
3611 if (smtp_batched_input)
3612 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3613 /* Does not return */
3616 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3617 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3618 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3620 /* Does not return */
3623 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3627 /* The applicable ACLs have been run */
3629 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3630 if (f.queue_only_policy) queued_by = US"ACL";
3633 #ifdef WITH_CONTENT_SCAN
3637 #ifdef EXPERIMENTAL_DCC
3642 #ifdef HAVE_LOCAL_SCAN
3643 /* The final check on the message is to run the scan_local() function. The
3644 version supplied with Exim always accepts, but this is a hook for sysadmins to
3645 supply their own checking code. The local_scan() function is run even when all
3646 the recipients have been discarded. */
3648 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3650 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3651 deleted, and the incident gets logged. */
3653 if (sigsetjmp(local_scan_env, 1) == 0)
3655 had_local_scan_crash = 0;
3656 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3657 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3658 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3659 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3661 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3662 local_scan_timeout);
3663 local_scan_data = NULL;
3665 had_local_scan_timeout = 0;
3666 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3667 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3668 rc = local_scan(data_fd, &local_scan_data);
3670 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3672 f.enable_dollar_recipients = FALSE;
3674 store_pool = POOL_MAIN; /* In case changed */
3675 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3678 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3679 os_non_restarting_signal(SIGFPE, SIG_DFL);
3680 os_non_restarting_signal(SIGILL, SIG_DFL);
3681 os_non_restarting_signal(SIGBUS, SIG_DFL);
3685 if (had_local_scan_crash)
3687 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3688 "signal %d - message temporarily rejected (size %d)",
3689 had_local_scan_crash, message_size);
3690 receive_bomb_out(US"local-scan-error", US"local verification problem");
3691 /* Does not return */
3693 if (had_local_scan_timeout)
3695 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3696 "message temporarily rejected (size %d)", message_size);
3697 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3698 /* Does not return */
3702 /* The length check is paranoia against some runaway code, and also because
3703 (for a success return) lines in the spool file are read into big_buffer. */
3705 if (local_scan_data)
3707 int len = Ustrlen(local_scan_data);
3708 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3709 local_scan_data = string_copyn(local_scan_data, len);
3712 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3714 if (!f.deliver_freeze) /* ACL might have already frozen */
3716 f.deliver_freeze = TRUE;
3717 deliver_frozen_at = time(NULL);
3718 frozen_by = US"local_scan()";
3720 rc = LOCAL_SCAN_ACCEPT;
3722 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3724 if (!f.queue_only_policy) /* ACL might have already queued */
3726 f.queue_only_policy = TRUE;
3727 queued_by = US"local_scan()";
3729 rc = LOCAL_SCAN_ACCEPT;
3732 /* Message accepted: remove newlines in local_scan_data because otherwise
3733 the spool file gets corrupted. Ensure that all recipients are qualified. */
3735 if (rc == LOCAL_SCAN_ACCEPT)
3737 if (local_scan_data)
3738 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3739 for (int i = 0; i < recipients_count; i++)
3741 recipient_item *r = recipients_list + i;
3742 r->address = rewrite_address_qualify(r->address, TRUE);
3744 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3746 if (recipients_count == 0 && !blackholed_by)
3747 blackholed_by = US"local_scan";
3750 /* Message rejected: newlines permitted in local_scan_data to generate
3751 multiline SMTP responses. */
3755 uschar *istemp = US"";
3759 errmsg = local_scan_data;
3761 Uunlink(spool_name); /* Cancel this message */
3765 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3766 "rejection given", rc);
3769 case LOCAL_SCAN_REJECT_NOLOGHDR:
3770 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3773 case LOCAL_SCAN_REJECT:
3774 smtp_code = US"550";
3775 if (!errmsg) errmsg = US"Administrative prohibition";
3778 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3779 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3782 case LOCAL_SCAN_TEMPREJECT:
3784 smtp_code = US"451";
3785 if (!errmsg) errmsg = US"Temporary local problem";
3786 istemp = US"temporarily ";
3790 g = string_append(NULL, 2, US"F=",
3791 sender_address[0] == 0 ? US"<>" : sender_address);
3792 g = add_host_info_for_log(g);
3794 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3795 string_from_gstring(g), istemp, string_printing(errmsg));
3799 if (!smtp_batched_input)
3801 smtp_respond(smtp_code, 3, TRUE, errmsg);
3802 message_id[0] = 0; /* Indicate no message accepted */
3803 smtp_reply = US""; /* Indicate reply already sent */
3804 goto TIDYUP; /* Skip to end of function */
3807 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3808 /* Does not return */
3812 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3813 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3814 US"message rejected by local scan code: ", error_rc, spool_data_file,
3816 /* Does not return */
3820 /* Reset signal handlers to ignore signals that previously would have caused
3821 the message to be abandoned. */
3823 signal(SIGTERM, SIG_IGN);
3824 signal(SIGINT, SIG_IGN);
3825 #endif /* HAVE_LOCAL_SCAN */
3828 /* Ensure the first time flag is set in the newly-received message. */
3830 f.deliver_firsttime = TRUE;
3832 #ifdef EXPERIMENTAL_BRIGHTMAIL
3834 { /* rewind data file */
3835 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3836 bmi_verdicts = bmi_process_message(header_list, data_fd);
3840 /* Update the timestamp in our Received: header to account for any time taken by
3841 an ACL or by local_scan(). The new time is the time that all reception
3842 processing is complete. */
3844 timestamp = expand_string(US"${tod_full}");
3845 tslen = Ustrlen(timestamp);
3847 memcpy(received_header->text + received_header->slen - tslen - 1,
3850 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3854 f.deliver_freeze = FALSE;
3855 f.queue_only_policy = FALSE;
3858 /* Keep the data file open until we have written the header file, in order to
3859 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3860 don't write the header file, and we unlink the data file. If writing the header
3861 file fails, we have failed to accept this message. */
3863 if (host_checking || blackholed_by)
3865 Uunlink(spool_name);
3866 msg_size = 0; /* Compute size for log line */
3867 for (header_line * h = header_list; h; h = h->next)
3868 if (h->type != '*') msg_size += h->slen;
3871 /* Write the -H file */
3874 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3876 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3877 Uunlink(spool_name); /* Lose the data file */
3881 smtp_reply = US"451 Error in writing spool file";
3882 message_id[0] = 0; /* Indicate no message accepted */
3887 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3888 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3890 /* Does not return */
3895 /* The message has now been successfully received. */
3897 receive_messagecount++;
3899 /* Add data size to written header size. We do not count the initial file name
3900 that is in the file, but we do add one extra for the notional blank line that
3901 precedes the data. This total differs from message_size in that it include the
3902 added Received: header and any other headers that got created locally. */
3904 if (fflush(spool_data_file))
3906 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3907 log_write(0, LOG_MAIN, "%s\n", errmsg);
3908 Uunlink(spool_name); /* Lose the data file */
3912 smtp_reply = US"451 Error in writing spool file";
3913 message_id[0] = 0; /* Indicate no message accepted */
3918 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3919 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3921 /* Does not return */
3924 fstat(data_fd, &statbuf);
3926 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3928 /* Generate a "message received" log entry. We do this by building up a dynamic
3929 string as required. We log the arrival of a new message while the
3930 file is still locked, just in case the machine is *really* fast, and delivers
3931 it first! Include any message id that is in the message - since the syntax of a
3932 message id is actually an addr-spec, we can use the parse routine to canonicalize
3935 g = string_get(256);
3937 g = string_append(g, 2,
3938 fake_response == FAIL ? US"(= " : US"<= ",
3939 sender_address[0] == 0 ? US"<>" : sender_address);
3940 if (message_reference)
3941 g = string_append(g, 2, US" R=", message_reference);
3943 g = add_host_info_for_log(g);
3946 if (LOGGING(tls_cipher) && tls_in.cipher)
3947 g = string_append(g, 2, US" X=", tls_in.cipher);
3948 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3949 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3950 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3951 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3952 if (LOGGING(tls_sni) && tls_in.sni)
3953 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3956 if (sender_host_authenticated)
3958 g = string_append(g, 2, US" A=", sender_host_authenticated);
3959 if (authenticated_id)
3961 g = string_append(g, 2, US":", authenticated_id);
3962 if (LOGGING(smtp_mailauth) && authenticated_sender)
3963 g = string_append(g, 2, US":", authenticated_sender);
3967 #ifndef DISABLE_PRDR
3969 g = string_catn(g, US" PRDR", 5);
3972 #ifdef SUPPORT_PROXY
3973 if (proxy_session && LOGGING(proxy))
3974 g = string_append(g, 2, US" PRX=", proxy_local_address);
3977 if (chunking_state > CHUNKING_OFFERED)
3978 g = string_catn(g, US" K", 2);
3980 sprintf(CS big_buffer, "%d", msg_size);
3981 g = string_append(g, 2, US" S=", big_buffer);
3983 /* log 8BITMIME mode announced in MAIL_FROM
3987 if (LOGGING(8bitmime))
3989 sprintf(CS big_buffer, "%d", body_8bitmime);
3990 g = string_append(g, 2, US" M8S=", big_buffer);
3993 #ifndef DISABLE_DKIM
3994 if (LOGGING(dkim) && dkim_verify_overall)
3995 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
3996 # ifdef EXPERIMENTAL_ARC
3997 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
3998 g = string_catn(g, US" ARC", 4);
4002 if (LOGGING(receive_time))
4003 g = string_append(g, 2, US" RT=", string_timediff(&received_time_taken));
4006 g = string_append(g, 2, US" Q=", queue_name);
4008 /* If an addr-spec in a message-id contains a quoted string, it can contain
4009 any characters except " \ and CR and so in particular it can contain NL!
4010 Therefore, make sure we use a printing-characters only version for the log.
4011 Also, allow for domain literals in the message id. */
4016 BOOL save_allow_domain_literals = allow_domain_literals;
4017 allow_domain_literals = TRUE;
4018 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4019 &errmsg, &start, &end, &domain, FALSE);
4020 allow_domain_literals = save_allow_domain_literals;
4022 g = string_append(g, 2, US" id=", string_printing(old_id));
4025 /* If subject logging is turned on, create suitable printing-character
4026 text. By expanding $h_subject: we make use of the MIME decoding. */
4028 if (LOGGING(subject) && subject_header)
4030 uschar *p = big_buffer;
4031 uschar *ss = expand_string(US"$h_subject:");
4033 /* Backslash-quote any double quotes or backslashes so as to make a
4034 a C-like string, and turn any non-printers into escape sequences. */
4037 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4039 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4044 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4047 /* Terminate the string: string_cat() and string_append() leave room, but do
4048 not put the zero in. */
4050 (void) string_from_gstring(g);
4052 /* Create a message log file if message logs are being used and this message is
4053 not blackholed. Write the reception stuff to it. We used to leave message log
4054 creation until the first delivery, but this has proved confusing for some
4057 if (message_logs && !blackholed_by)
4060 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4062 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4066 (void)directory_make(spool_directory,
4067 spool_sname(US"msglog", message_subdir),
4068 MSGLOG_DIRECTORY_MODE, TRUE);
4069 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4073 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4074 m_name, strerror(errno));
4077 FILE *message_log = fdopen(fd, "a");
4080 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4081 m_name, strerror(errno));
4086 uschar *now = tod_stamp(tod_log);
4087 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4088 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4090 if (f.queue_only_policy) fprintf(message_log,
4091 "%s no immediate delivery: queued%s%s by %s\n", now,
4092 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4094 (void)fclose(message_log);
4099 /* Everything has now been done for a successful message except logging its
4100 arrival, and outputting an SMTP response. While writing to the log, set a flag
4101 to cause a call to receive_bomb_out() if the log cannot be opened. */
4103 f.receive_call_bombout = TRUE;
4105 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4106 connection has gone away. This can only be done if there is no unconsumed input
4107 waiting in the local input buffer. We can test for this by calling
4108 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4109 input to be sent following the final dot, so the presence of following input is
4112 If the connection is still present, but there is no unread input for the
4113 socket, the result of a select() call will be zero. If, however, the connection
4114 has gone away, or if there is pending input, the result of select() will be
4115 non-zero. The two cases can be distinguished by trying to read the next input
4116 character. If we succeed, we can unread it so that it remains in the local
4117 buffer for handling later. If not, the connection has been lost.
4119 Of course, since TCP/IP is asynchronous, there is always a chance that the
4120 connection will vanish between the time of this test and the sending of the
4121 response, but the chance of this happening should be small. */
4123 if (smtp_input && sender_host_address && !f.sender_host_notsocket &&
4124 !receive_smtp_buffered())
4127 fd_set select_check;
4128 FD_ZERO(&select_check);
4129 FD_SET(fileno(smtp_in), &select_check);
4133 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4135 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4136 if (c != EOF) (receive_ungetc)(c); else
4138 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4139 smtp_reply = US""; /* No attempt to send a response */
4140 smtp_yield = FALSE; /* Nothing more on this connection */
4142 /* Re-use the log line workspace */
4145 g = string_cat(g, US"SMTP connection lost after final dot");
4146 g = add_host_info_for_log(g);
4147 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4149 /* Delete the files for this aborted message. */
4151 Uunlink(spool_name);
4152 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4153 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4160 /* The connection has not gone away; we really are going to take responsibility
4161 for this message. */
4163 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4166 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4167 the sender's dot (below).
4168 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4169 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4170 in which case pass temp-reject back to initiator and dump the files.
4172 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4174 XXX We do not handle queue-only, freezing, or blackholes.
4176 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4178 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4179 /* Logging was done in finaldot() */
4182 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4183 cutthrough_done = ACCEPTED;
4184 break; /* message_id needed for SMTP accept below */
4186 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4187 ... for which, pass back the exact error */
4188 if (cutthrough.defer_pass) smtp_reply = string_copy_malloc(msg);
4189 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4190 break; /* message_id needed for SMTP accept below */
4192 default: /* Unknown response, or error. Treat as temp-reject. */
4193 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4194 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4195 break; /* message_id needed for SMTP accept below */
4197 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4198 smtp_reply = string_copy_malloc(msg); /* Pass on the exact error */
4199 cutthrough_done = PERM_REJ;
4204 #ifndef DISABLE_PRDR
4205 if(!smtp_reply || prdr_requested)
4210 log_write(0, LOG_MAIN |
4211 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4212 (LOGGING(received_sender) ? LOG_SENDER : 0),
4215 /* Log any control actions taken by an ACL or local_scan(). */
4217 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4218 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4219 "no immediate delivery: queued%s%s by %s",
4220 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4223 f.receive_call_bombout = FALSE;
4225 store_reset(g); /* The store for the main log message can be reused */
4227 /* If the message is frozen, and freeze_tell is set, do the telling. */
4229 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4230 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4231 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4232 message_id, frozen_by, sender_address);
4235 /* Either a message has been successfully received and written to the two spool
4236 files, or an error in writing the spool has occurred for an SMTP message, or
4237 an SMTP message has been rejected for policy reasons, or a message was passed on
4238 by cutthrough delivery. (For a non-SMTP message we will have already given up
4239 because there's no point in carrying on!) For non-cutthrough we must now close
4240 (and thereby unlock) the data file. In the successful case, this leaves the
4241 message on the spool, ready for delivery. In the error case, the spool file will
4242 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4245 For cutthrough we hold the data file locked until we have deleted it, otherwise
4246 a queue-runner could grab it in the window.
4248 A fflush() was done earlier in the expectation that any write errors on the
4249 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4250 possible for fclose() to fail - but what to do? What has happened to the lock
4251 if this happens? We can at least log it; if it is observed on some platform
4252 then we can think about properly declaring the message not-received. */
4256 /* In SMTP sessions we may receive several messages in one connection. After
4257 each one, we wait for the clock to tick at the level of message-id granularity.
4258 This is so that the combination of time+pid is unique, even on systems where the
4259 pid can be re-used within our time interval. We can't shorten the interval
4260 without re-designing the message-id. See comments above where the message id is
4261 created. This is Something For The Future.
4262 Do this wait any time we have created a message-id, even if we rejected the
4263 message. This gives unique IDs for logging done by ACLs. */
4265 if (id_resolution != 0)
4267 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
4268 exim_wait_tick(&message_id_tv, id_resolution);
4273 process_info[process_info_len] = 0; /* Remove message id */
4274 if (spool_data_file && cutthrough_done == NOT_TRIED)
4276 if (fclose(spool_data_file)) /* Frees the lock */
4277 log_write(0, LOG_MAIN|LOG_PANIC,
4278 "spoolfile error on close: %s", strerror(errno));
4279 spool_data_file = NULL;
4282 /* Now reset signal handlers to their defaults */
4284 signal(SIGTERM, SIG_DFL);
4285 signal(SIGINT, SIG_DFL);
4287 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4288 value, which defaults TRUE - meaning there may be more incoming messages from
4289 this connection. For non-SMTP callers (where there is only ever one message),
4290 the default is FALSE. */
4296 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4297 is set to the response that should be sent. When it is NULL, we generate
4298 default responses. After an ACL error or local_scan() error, the response has
4299 already been sent, and smtp_reply is an empty string to indicate this. */
4301 if (!smtp_batched_input)
4305 if (fake_response != OK)
4306 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4307 3, TRUE, fake_response_text);
4309 /* An OK response is required; use "message" text if present. */
4313 uschar *code = US"250";
4315 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4316 smtp_respond(code, len, TRUE, user_msg);
4319 /* Default OK response */
4321 else if (chunking_state > CHUNKING_OFFERED)
4323 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n", FALSE,
4324 chunking_datasize, message_size+message_linecount, message_id);
4325 chunking_state = CHUNKING_OFFERED;
4328 smtp_printf("250 OK id=%s\r\n", FALSE, message_id);
4332 "\n**** SMTP testing: that is not a real message id!\n\n");
4335 /* smtp_reply is set non-empty */
4337 else if (smtp_reply[0] != 0)
4338 if (fake_response != OK && smtp_reply[0] == '2')
4339 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4340 fake_response_text);
4342 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4344 switch (cutthrough_done)
4347 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4349 /* Delete spool files */
4350 Uunlink(spool_name);
4351 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4352 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4356 if (cutthrough.defer_pass)
4358 Uunlink(spool_name);
4359 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4360 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4365 if (cutthrough_done != NOT_TRIED)
4367 if (spool_data_file)
4369 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4370 spool_data_file = NULL;
4372 message_id[0] = 0; /* Prevent a delivery from starting */
4373 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4374 cutthrough.defer_pass = FALSE;
4378 /* For batched SMTP, generate an error message on failure, and do
4379 nothing on success. The function moan_smtp_batch() does not return -
4380 it exits from the program with a non-zero return code. */
4382 else if (smtp_reply)
4383 moan_smtp_batch(NULL, "%s", smtp_reply);
4387 /* If blackholing, we can immediately log this message's sad fate. The data
4388 file has already been unlinked, and the header file was never written to disk.
4389 We must now indicate that nothing was received, to prevent a delivery from
4394 const uschar *detail =
4395 #ifdef HAVE_LOCAL_SCAN
4396 local_scan_data ? string_printing(local_scan_data) :
4398 string_sprintf("(%s discarded recipients)", blackholed_by);
4399 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4400 log_write(0, LOG_MAIN, "Completed");
4404 /* Reset headers so that logging of rejects for a subsequent message doesn't
4405 include them. It is also important to set header_last = NULL before exiting
4406 from this function, as this prevents certain rewrites that might happen during
4407 subsequent verifying (of another incoming message) from trying to add headers
4408 when they shouldn't. */
4410 header_list = header_last = NULL;
4412 return yield; /* TRUE if more messages (SMTP only) */
4415 /* End of receive.c */