1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 */
7 /* See the file NOTICE for conditions of use and distribution. */
9 /* Code for receiving a message and setting up spool files. */
14 #ifdef EXPERIMENTAL_DCC
22 /*************************************************
23 * Local static variables *
24 *************************************************/
26 static int data_fd = -1;
27 static uschar *spool_name = US"";
29 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
31 #ifdef HAVE_LOCAL_SCAN
32 jmp_buf local_scan_env; /* error-handling context for local_scan */
33 unsigned had_local_scan_crash;
34 unsigned had_local_scan_timeout;
38 /*************************************************
39 * Non-SMTP character reading functions *
40 *************************************************/
42 /* These are the default functions that are set up in the variables such as
43 receive_getc initially. They just call the standard functions, passing stdin as
44 the file. (When SMTP input is occurring, different functions are used by
45 changing the pointer variables.) */
48 stdin_getc(unsigned lim)
54 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
55 log_write(L_lost_incoming_connection,
56 LOG_MAIN, "timed out while reading local message");
57 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
61 if (filter_test == FTEST_NONE)
63 fprintf(stderr, "\nexim: %s received - message abandoned\n",
64 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
65 log_write(0, LOG_MAIN, "%s received while reading local message",
66 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
68 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
76 return ungetc(c, stdin);
94 /*************************************************
95 * Check that a set sender is allowed *
96 *************************************************/
98 /* This function is called when a local caller sets an explicit sender address.
99 It checks whether this is permitted, which it is for trusted callers.
100 Otherwise, it must match the pattern(s) in untrusted_set_sender.
102 Arguments: the proposed sender address
103 Returns: TRUE for a trusted caller
104 TRUE if the address has been set, untrusted_set_sender has been
105 set, and the address matches something in the list
110 receive_check_set_sender(uschar *newsender)
113 if (f.trusted_caller) return TRUE;
114 if (!newsender || !untrusted_set_sender) return FALSE;
115 qnewsender = Ustrchr(newsender, '@')
116 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
117 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
123 /*************************************************
124 * Read space info for a partition *
125 *************************************************/
127 /* This function is called by receive_check_fs() below, and also by string
128 expansion for variables such as $spool_space. The field names for the statvfs
129 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
130 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
131 have inodes, and they return -1 for the number available.
133 Later: It turns out that some file systems that do not have the concept of
134 inodes return 0 rather than -1. Such systems should also return 0 for the total
135 number of inodes, so we require that to be greater than zero before returning
139 isspool TRUE for spool partition, FALSE for log partition
140 inodeptr address of int to receive inode count; -1 if there isn't one
142 Returns: available on-root space, in kilobytes
143 -1 for log partition if there isn't one
145 All values are -1 if the STATFS functions are not available.
149 receive_statvfs(BOOL isspool, int *inodeptr)
152 struct STATVFS statbuf;
158 /* The spool directory must always exist. */
162 path = spool_directory;
166 /* Need to cut down the log file path to the directory, and to ignore any
167 appearance of "syslog" in it. */
171 int sep = ':'; /* Not variable - outside scripts use */
172 const uschar *p = log_file_path;
175 /* An empty log_file_path means "use the default". This is the same as an
176 empty item in a list. */
178 if (*p == 0) p = US":";
179 /* should never be a tainted list */
180 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
181 if (Ustrcmp(path, "syslog") != 0)
184 if (path == NULL) /* No log files */
190 /* An empty string means use the default, which is in the spool directory.
191 But don't just use the spool directory, as it is possible that the log
192 subdirectory has been symbolically linked elsewhere. */
196 sprintf(CS buffer, CS"%s/log", CS spool_directory);
202 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
206 /* We now have the path; do the business */
208 memset(&statbuf, 0, sizeof(statbuf));
210 if (STATVFS(CS path, &statbuf) != 0)
211 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
212 { /* Can happen on first run after installation */
218 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
219 "%s directory %s: %s", name, path, strerror(errno));
220 smtp_closedown(US"spool or log directory problem");
221 exim_exit(EXIT_FAILURE);
224 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
226 /* Disks are getting huge. Take care with computing the size in kilobytes. */
228 return (int_eximarith_t)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
231 /* Unable to find partition sizes in this environment. */
241 /*************************************************
242 * Check space on spool and log partitions *
243 *************************************************/
245 /* This function is called before accepting a message; if any thresholds are
246 set, it checks them. If a message_size is supplied, it checks that there is
247 enough space for that size plus the threshold - i.e. that the message won't
248 reduce the space to the threshold. Not all OS have statvfs(); for those that
249 don't, this function always returns TRUE. For some OS the old function and
250 struct name statfs is used; that is handled by a macro, defined in exim.h.
253 msg_size the (estimated) size of an incoming message
255 Returns: FALSE if there isn't enough space, or if the information cannot
257 TRUE if no check was done or there is enough space
261 receive_check_fs(int msg_size)
263 int_eximarith_t space;
266 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
268 space = receive_statvfs(TRUE, &inodes);
271 debug_printf("spool directory space = " PR_EXIM_ARITH "K inodes = %d "
272 "check_space = " PR_EXIM_ARITH "K inodes = %d msg_size = %d\n",
273 space, inodes, check_spool_space, check_spool_inodes, msg_size);
275 if ( space >= 0 && space + msg_size / 1024 < check_spool_space
276 || inodes >= 0 && inodes < check_spool_inodes)
278 log_write(0, LOG_MAIN, "spool directory space check failed: space="
279 PR_EXIM_ARITH " inodes=%d", space, inodes);
284 if (check_log_space > 0 || check_log_inodes > 0)
286 space = receive_statvfs(FALSE, &inodes);
289 debug_printf("log directory space = " PR_EXIM_ARITH "K inodes = %d "
290 "check_space = " PR_EXIM_ARITH "K inodes = %d\n",
291 space, inodes, check_log_space, check_log_inodes);
293 if ( space >= 0 && space < check_log_space
294 || inodes >= 0 && inodes < check_log_inodes)
296 log_write(0, LOG_MAIN, "log directory space check failed: space=" PR_EXIM_ARITH
297 " inodes=%d", space, inodes);
307 /*************************************************
308 * Bomb out while reading a message *
309 *************************************************/
311 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
312 received, or if there is a timeout. A rarer case might be if the log files are
313 screwed up and Exim can't open them to record a message's arrival. Handling
314 that case is done by setting a flag to cause the log functions to call this
315 function if there is an ultimate disaster. That is why it is globally
319 reason text reason to pass to the not-quit ACL
320 msg default SMTP response to give if in an SMTP session
325 receive_bomb_out(uschar *reason, uschar *msg)
327 static BOOL already_bombing_out;
328 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
329 timeouts, if someone has something slow in their quit ACL. Since the only
330 things we should be doing are to close down cleanly ASAP, on the second
331 pass we also close down stuff that might be opened again, before bypassing
332 the ACL call and exiting. */
334 /* If spool_name is set, it contains the name of the data file that is being
335 written. Unlink it before closing so that it cannot be picked up by a delivery
336 process. Ensure that any header file is also removed. */
338 if (spool_name[0] != '\0')
341 spool_name[Ustrlen(spool_name) - 1] = 'H';
343 spool_name[0] = '\0';
346 /* Now close the file if it is open, either as a fd or a stream. */
350 (void)fclose(spool_data_file);
351 spool_data_file = NULL;
353 else if (data_fd >= 0)
355 (void)close(data_fd);
359 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
360 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
363 if (!already_bombing_out)
365 already_bombing_out = TRUE;
368 if (smtp_batched_input)
369 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
370 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
371 smtp_active_hostname, msg);
375 /* Exit from the program (non-BSMTP cases) */
377 exim_exit(EXIT_FAILURE);
381 /*************************************************
382 * Data read timeout *
383 *************************************************/
385 /* Handler function for timeouts that occur while reading the data that
388 Argument: the signal number
393 data_timeout_handler(int sig)
395 had_data_timeout = sig;
400 #ifdef HAVE_LOCAL_SCAN
401 /*************************************************
402 * local_scan() timeout *
403 *************************************************/
405 /* Handler function for timeouts that occur while running a local_scan()
406 function. Posix recommends against calling longjmp() from a signal-handler,
407 but the GCC manual says you can so we will, and trust that it's better than
408 calling probably non-signal-safe funxtions during logging from within the
409 handler, even with other compilers.
411 See also https://cwe.mitre.org/data/definitions/745.html which also lists
414 This is all because we have no control over what might be written for a
415 local-scan function, so cannot sprinkle had-signal checks after each
416 call-site. At least with the default "do-nothing" function we won't
419 Argument: the signal number
424 local_scan_timeout_handler(int sig)
426 had_local_scan_timeout = sig;
427 siglongjmp(local_scan_env, 1);
432 /*************************************************
433 * local_scan() crashed *
434 *************************************************/
436 /* Handler function for signals that occur while running a local_scan()
439 Argument: the signal number
444 local_scan_crash_handler(int sig)
446 had_local_scan_crash = sig;
447 siglongjmp(local_scan_env, 1);
450 #endif /*HAVE_LOCAL_SCAN*/
453 /*************************************************
454 * SIGTERM or SIGINT received *
455 *************************************************/
457 /* Handler for SIGTERM or SIGINT signals that occur while reading the
458 data that comprises a message.
460 Argument: the signal number
465 data_sigterm_sigint_handler(int sig)
467 had_data_sigint = sig;
472 /*************************************************
473 * Add new recipient to list *
474 *************************************************/
476 /* This function builds a list of recipient addresses in argc/argv
480 recipient the next address to add to recipients_list
481 pno parent number for fixed aliases; -1 otherwise
487 receive_add_recipient(uschar *recipient, int pno)
489 if (recipients_count >= recipients_list_max)
491 recipient_item *oldlist = recipients_list;
492 int oldmax = recipients_list_max;
494 const int safe_recipients_limit = INT_MAX / 2 / sizeof(recipient_item);
495 if (recipients_list_max < 0 || recipients_list_max >= safe_recipients_limit)
497 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Too many recipients: %d", recipients_list_max);
500 recipients_list_max = recipients_list_max ? 2*recipients_list_max : 50;
501 recipients_list = store_get(recipients_list_max * sizeof(recipient_item), FALSE);
503 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
506 recipients_list[recipients_count].address = recipient;
507 recipients_list[recipients_count].pno = pno;
508 #ifdef EXPERIMENTAL_BRIGHTMAIL
509 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
510 /* reset optin string pointer for next recipient */
511 bmi_current_optin = NULL;
513 recipients_list[recipients_count].orcpt = NULL;
514 recipients_list[recipients_count].dsn_flags = 0;
515 recipients_list[recipients_count++].errors_to = NULL;
521 /*************************************************
522 * Send user response message *
523 *************************************************/
525 /* This function is passed a default response code and a user message. It calls
526 smtp_message_code() to check and possibly modify the response code, and then
527 calls smtp_respond() to transmit the response. I put this into a function
528 just to avoid a lot of repetition.
531 code the response code
532 user_msg the user message
539 smtp_user_msg(uschar *code, uschar *user_msg)
542 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
543 smtp_respond(code, len, TRUE, user_msg);
551 /*************************************************
552 * Remove a recipient from the list *
553 *************************************************/
555 /* This function is provided for local_scan() to use.
558 recipient address to remove
560 Returns: TRUE if it did remove something; FALSE otherwise
564 receive_remove_recipient(uschar *recipient)
566 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
568 for (int count = 0; count < recipients_count; count++)
569 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
571 if ((--recipients_count - count) > 0)
572 memmove(recipients_list + count, recipients_list + count + 1,
573 (recipients_count - count)*sizeof(recipient_item));
583 /* Pause for a while waiting for input. If none received in that time,
584 close the logfile, if we had one open; then if we wait for a long-running
585 datasource (months, in one use-case) log rotation will not leave us holding
591 if (!receive_timeout)
594 timesince(&t, &received_time);
595 if (t.tv_sec > 30*60)
600 FD_ZERO(&r); FD_SET(0, &r);
601 t.tv_sec = 30*60 - t.tv_sec; t.tv_usec = 0;
602 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
607 /*************************************************
608 * Read data portion of a non-SMTP message *
609 *************************************************/
611 /* This function is called to read the remainder of a message (following the
612 header) when the input is not from SMTP - we are receiving a local message on
613 a standard input stream. The message is always terminated by EOF, and is also
614 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
615 two cases for maximum efficiency.
617 Ensure that the body ends with a newline. This will naturally be the case when
618 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
619 as "sequences of lines" - this of course strictly applies only to SMTP, but
620 deliveries into BSD-type mailbox files also require it. Exim used to have a
621 flag for doing this at delivery time, but as it was always set for all
622 transports, I decided to simplify things by putting the check here instead.
624 There is at least one MUA (dtmail) that sends CRLF via this interface, and
625 other programs are known to do this as well. Exim used to have a option for
626 dealing with this: in July 2003, after much discussion, the code has been
627 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
629 However, for the case when a dot on a line by itself terminates a message, the
630 only recognized terminating sequences before and after the dot are LF and CRLF.
631 Otherwise, having read EOL . CR, you don't know whether to read another
634 Internally, in messages stored in Exim's spool files, LF is used as the line
635 terminator. Under the new regime, bare CRs will no longer appear in these
639 fout a FILE to which to write the message
641 Returns: One of the END_xxx values indicating why it stopped reading
645 read_message_data(FILE *fout)
649 register int linelength = 0;
651 /* Handle the case when only EOF terminates the message */
657 /*XXX we do a gettimeofday before checking for every received char,
658 which is hardly clever. The function-indirection doesn't help, but
659 an additional function to check for nonempty read buffer would help.
660 See stdin_getc() / smtp_getc() / tls_getc() / bdat_getc(). */
663 log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF;
666 if (ch == 0) body_zerocount++;
667 if (last_ch == '\r' && ch != '\n')
669 if (linelength > max_received_linelength)
670 max_received_linelength = linelength;
672 if (fputc('\n', fout) == EOF) return END_WERROR;
676 if (ch == '\r') continue;
678 if (fputc(ch, fout) == EOF) return END_WERROR;
681 if (linelength > max_received_linelength)
682 max_received_linelength = linelength;
687 if (++message_size > thismessage_size_limit) return END_SIZE;
692 if (linelength > max_received_linelength)
693 max_received_linelength = linelength;
694 if (fputc('\n', fout) == EOF) return END_WERROR;
702 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
706 while (log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
708 if (ch == 0) body_zerocount++;
711 case 0: /* Normal state (previous char written) */
715 if (linelength > max_received_linelength)
716 max_received_linelength = linelength;
721 { ch_state = 2; continue; }
724 case 1: /* After written "\n" */
725 if (ch == '.') { ch_state = 3; continue; }
726 if (ch == '\r') { ch_state = 2; continue; }
727 if (ch == '\n') { body_linecount++; linelength = -1; }
732 body_linecount++; /* After unwritten "\r" */
733 if (linelength > max_received_linelength)
734 max_received_linelength = linelength;
742 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
743 if (ch == '\r') continue;
749 case 3: /* After "\n." (\n written, dot not) */
750 if (ch == '\n') return END_DOT;
751 if (ch == '\r') { ch_state = 4; continue; }
754 if (fputc('.', fout) == EOF) return END_WERROR;
758 case 4: /* After "\n.\r" (\n written, rest not) */
759 if (ch == '\n') return END_DOT;
762 if (fputs(".\n", fout) == EOF) return END_WERROR;
763 if (ch == '\r') { ch_state = 2; continue; }
769 if (fputc(ch, fout) == EOF) return END_WERROR;
770 if (++message_size > thismessage_size_limit) return END_SIZE;
773 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
774 the message ends with a newline, and we must also write any characters that
775 were saved up while testing for an ending dot. */
779 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
780 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
781 message_size += Ustrlen(ends[ch_state]);
791 /*************************************************
792 * Read data portion of an SMTP message *
793 *************************************************/
795 /* This function is called to read the remainder of an SMTP message (after the
796 headers), or to skip over it when an error has occurred. In this case, the
797 output file is passed as NULL.
799 If any line begins with a dot, that character is skipped. The input should only
800 be successfully terminated by CR LF . CR LF unless it is local (non-network)
801 SMTP, in which case the CRs are optional, but...
803 FUDGE: It seems that sites on the net send out messages with just LF
804 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
805 we make the CRs optional in all cases.
807 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
808 well, so that there are no CRs in spooled messages. However, the message
809 terminating dot is not recognized between two bare CRs.
812 fout a FILE to which to write the message; NULL if skipping
814 Returns: One of the END_xxx values indicating why it stopped reading
818 read_message_data_smtp(FILE *fout)
824 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
826 if (ch == 0) body_zerocount++;
829 case 0: /* After LF or CRLF */
833 continue; /* Don't ever write . after LF */
837 /* Else fall through to handle as normal uschar. */
839 case 1: /* Normal state */
844 if (linelength > max_received_linelength)
845 max_received_linelength = linelength;
855 case 2: /* After (unwritten) CR */
857 if (linelength > max_received_linelength)
858 max_received_linelength = linelength;
867 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
868 cutthrough_data_put_nl();
869 if (ch != '\r') ch_state = 1; else continue;
873 case 3: /* After [CR] LF . */
881 /* The dot was removed at state 3. For a doubled dot, here, reinstate
882 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
883 and to file below. */
887 cutthrough_data_puts(&c, 1);
892 case 4: /* After [CR] LF . CR */
893 if (ch == '\n') return END_DOT;
896 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
897 cutthrough_data_put_nl();
907 /* Add the character to the spool file, unless skipping; then loop for the
914 if (fputc(ch, fout) == EOF) return END_WERROR;
915 if (message_size > thismessage_size_limit) return END_SIZE;
918 cutthrough_data_put_nl();
922 cutthrough_data_puts(&c, 1);
926 /* Fall through here if EOF encountered. This indicates some kind of error,
927 since a correct message is terminated by [CR] LF . [CR] LF. */
935 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
936 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
937 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
938 body_linecount accounting for proper re-expansion for the wire, so use
939 a cut-down version of the state-machine above; we don't need to do leading-dot
940 detection and unstuffing.
943 fout a FILE to which to write the message; NULL if skipping;
944 must be open for both writing and reading.
946 Returns: One of the END_xxx values indicating why it stopped reading
950 read_message_bdat_smtp(FILE *fout)
952 int linelength = 0, ch;
953 enum CH_STATE ch_state = LF_SEEN;
958 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
960 case EOF: return END_EOF;
961 case ERR: return END_PROTOCOL;
963 /* Nothing to get from the sender anymore. We check the last
964 character written to the spool.
966 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
967 If we would be strict, we would refuse such broken messages.
968 But we are liberal, so we fix it. It would be easy just to append
969 the "\n" to the spool.
971 But there are some more things (line counting, message size calculation and such),
972 that would need to be duplicated here. So we simply do some ungetc
977 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
978 if (fgetc(fout) == '\n') return END_DOT;
981 if (linelength == -1) /* \r already seen (see below) */
983 DEBUG(D_receive) debug_printf("Add missing LF\n");
987 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
988 bdat_ungetc('\r'); /* not even \r was seen */
992 case '\0': body_zerocount++; break;
996 case LF_SEEN: /* After LF or CRLF */
998 /* fall through to handle as normal uschar. */
1000 case MID_LINE: /* Mid-line state */
1005 if (linelength > max_received_linelength)
1006 max_received_linelength = linelength;
1009 else if (ch == '\r')
1012 if (fix_nl) bdat_ungetc('\n');
1013 continue; /* don't write CR */
1017 case CR_SEEN: /* After (unwritten) CR */
1019 if (linelength > max_received_linelength)
1020 max_received_linelength = linelength;
1027 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
1028 cutthrough_data_put_nl();
1029 if (ch == '\r') continue; /* don't write CR */
1030 ch_state = MID_LINE;
1035 /* Add the character to the spool file, unless skipping */
1041 if (fputc(ch, fout) == EOF) return END_WERROR;
1042 if (message_size > thismessage_size_limit) return END_SIZE;
1045 cutthrough_data_put_nl();
1049 cutthrough_data_puts(&c, 1);
1056 read_message_bdat_smtp_wire(FILE *fout)
1060 /* Remember that this message uses wireformat. */
1062 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1063 fout ? "writing spoolfile in wire format" : "flushing input");
1064 f.spool_file_wireformat = TRUE;
1068 if (chunking_data_left > 0)
1070 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1071 uschar * buf = bdat_getbuf(&len);
1073 if (!buf) return END_EOF;
1074 message_size += len;
1075 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1077 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1079 case EOF: return END_EOF;
1080 case EOD: return END_DOT;
1081 case ERR: return END_PROTOCOL;
1087 max_received_linelength
1091 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1094 if (message_size > thismessage_size_limit) return END_SIZE;
1102 /*************************************************
1103 * Swallow SMTP message *
1104 *************************************************/
1106 /* This function is called when there has been some kind of error while reading
1107 an SMTP message, and the remaining data may need to be swallowed. It is global
1108 because it is called from smtp_closedown() to shut down an incoming call
1111 Argument: a FILE from which to read the message
1116 receive_swallow_smtp(void)
1118 if (message_ended >= END_NOTENDED)
1119 message_ended = chunking_state <= CHUNKING_OFFERED
1120 ? read_message_data_smtp(NULL)
1121 : read_message_bdat_smtp_wire(NULL);
1126 /*************************************************
1127 * Handle lost SMTP connection *
1128 *************************************************/
1130 /* This function logs connection loss incidents and generates an appropriate
1133 Argument: additional data for the message
1134 Returns: the SMTP response
1138 handle_lost_connection(uschar *s)
1140 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1141 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1142 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1143 return US"421 Lost incoming connection";
1149 /*************************************************
1150 * Handle a non-smtp reception error *
1151 *************************************************/
1153 /* This function is called for various errors during the reception of non-SMTP
1154 messages. It either sends a message to the sender of the problem message, or it
1155 writes to the standard error stream.
1158 errcode code for moan_to_sender(), identifying the error
1159 text1 first message text, passed to moan_to_sender()
1160 text2 second message text, used only for stderrr
1161 error_rc code to pass to exim_exit if no problem
1162 f FILE containing body of message (may be stdin)
1163 hptr pointer to instore headers or NULL
1165 Returns: calls exim_exit(), which does not return
1169 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1170 FILE *f, header_line *hptr)
1172 if (error_handling == ERRORS_SENDER)
1176 eblock.text1 = text1;
1177 eblock.text2 = US"";
1178 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1179 error_rc = EXIT_FAILURE;
1182 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1184 exim_exit(error_rc);
1189 /*************************************************
1190 * Add header lines set up by ACL *
1191 *************************************************/
1193 /* This function is called to add the header lines that were set up by
1194 statements in an ACL to the list of headers in memory. It is done in two stages
1195 like this, because when the ACL for RCPT is running, the other headers have not
1196 yet been received. This function is called twice; once just before running the
1197 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1198 are visible to the DATA ACL.
1200 Originally these header lines were added at the end. Now there is support for
1201 three different places: top, bottom, and after the Received: header(s). There
1202 will always be at least one Received: header, even if it is marked deleted, and
1203 even if something else has been put in front of it.
1206 acl_name text to identify which ACL
1212 add_acl_headers(int where, uschar *acl_name)
1214 header_line *last_received = NULL;
1218 case ACL_WHERE_DKIM:
1219 case ACL_WHERE_MIME:
1220 case ACL_WHERE_DATA:
1221 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1222 && (acl_removed_headers || acl_added_headers))
1224 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1225 " will not take effect on cutthrough deliveries");
1230 if (acl_removed_headers)
1232 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1234 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1236 const uschar * list = acl_removed_headers;
1237 int sep = ':'; /* This is specified as a colon-separated list */
1240 while ((s = string_nextinlist(&list, &sep, NULL, 0)))
1241 if (header_testname(h, s, Ustrlen(s), FALSE))
1243 h->type = htype_old;
1244 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1247 acl_removed_headers = NULL;
1248 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1251 if (!acl_added_headers) return;
1252 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1254 for (header_line * h = acl_added_headers, * next; h; h = next)
1261 h->next = header_list;
1263 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1269 last_received = header_list;
1270 while (!header_testname(last_received, US"Received", 8, FALSE))
1271 last_received = last_received->next;
1272 while (last_received->next &&
1273 header_testname(last_received->next, US"Received", 8, FALSE))
1274 last_received = last_received->next;
1276 h->next = last_received->next;
1277 last_received->next = h;
1278 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1282 /* add header before any header which is NOT Received: or Resent- */
1283 last_received = header_list;
1284 while ( last_received->next &&
1285 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1286 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1287 last_received = last_received->next;
1288 /* last_received now points to the last Received: or Resent-* header
1289 in an uninterrupted chain of those header types (seen from the beginning
1290 of all headers. Our current header must follow it. */
1291 h->next = last_received->next;
1292 last_received->next = h;
1293 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1298 header_last->next = h;
1299 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1303 if (!h->next) header_last = h;
1305 /* Check for one of the known header types (From:, To:, etc.) though in
1306 practice most added headers are going to be "other". Lower case
1307 identification letters are never stored with the header; they are used
1308 for existence tests when messages are received. So discard any lower case
1311 h->type = header_checkname(h, FALSE);
1312 if (h->type >= 'a') h->type = htype_other;
1314 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1317 acl_added_headers = NULL;
1318 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1323 /*************************************************
1324 * Add host information for log line *
1325 *************************************************/
1327 /* Called for acceptance and rejecting log lines. This adds information about
1328 the calling host to a string that is being built dynamically.
1331 s the dynamic string
1333 Returns: the extended string
1337 add_host_info_for_log(gstring * g)
1339 if (sender_fullhost)
1341 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1342 g = string_catn(g, US" DS", 3);
1343 g = string_append(g, 2, US" H=", sender_fullhost);
1344 if (LOGGING(incoming_interface) && interface_address)
1345 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1347 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1349 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1350 f.tcp_in_fastopen_logged = TRUE;
1353 g = string_append(g, 2, US" U=", sender_ident);
1354 if (received_protocol)
1355 g = string_append(g, 2, US" P=", received_protocol);
1356 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1358 g = string_catn(g, US" L", 2);
1359 #ifndef DISABLE_PIPE_CONNECT
1360 if (f.smtp_in_early_pipe_used)
1361 g = string_catn(g, US"*", 1);
1362 else if (f.smtp_in_early_pipe_advertised)
1363 g = string_catn(g, US".", 1);
1365 if (!f.smtp_in_pipelining_used)
1366 g = string_catn(g, US"-", 1);
1373 #ifdef WITH_CONTENT_SCAN
1375 /*************************************************
1376 * Run the MIME ACL on a message *
1377 *************************************************/
1379 /* This code is in a subroutine so that it can be used for both SMTP
1380 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1383 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1384 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1385 smtp_reply_ptr Where SMTP reply is being built
1386 blackholed_by_ptr Where "blackholed by" message is being built
1388 Returns: TRUE to carry on; FALSE to abandon the message
1392 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1393 uschar **blackholed_by_ptr)
1396 uschar * rfc822_file_path = NULL;
1397 unsigned long mbox_size;
1398 uschar *user_msg, *log_msg;
1399 int mime_part_count_buffer = -1;
1400 uschar * mbox_filename;
1403 /* check if it is a MIME message */
1405 for (header_line * my_headerlist = header_list; my_headerlist;
1406 my_headerlist = my_headerlist->next)
1407 if ( my_headerlist->type != '*' /* skip deleted headers */
1408 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1411 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1415 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1420 /* make sure the eml mbox file is spooled up */
1421 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1422 { /* error while spooling */
1423 log_write(0, LOG_MAIN|LOG_PANIC,
1424 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1425 Uunlink(spool_name);
1427 #ifdef EXPERIMENTAL_DCC
1430 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1431 message_id[0] = 0; /* Indicate no message accepted */
1432 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1433 return FALSE; /* Indicate skip to end of receive function */
1439 mime_part_count = -1;
1440 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1441 (void)fclose(mbox_file);
1443 if (rfc822_file_path)
1445 mime_part_count = mime_part_count_buffer;
1447 if (unlink(CS rfc822_file_path) == -1)
1449 log_write(0, LOG_PANIC,
1450 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1453 rfc822_file_path = NULL;
1456 /* check if we must check any message/rfc822 attachments */
1459 uschar * scandir = string_copyn(mbox_filename,
1460 Ustrrchr(mbox_filename, '/') - mbox_filename);
1461 struct dirent * entry;
1464 for (tempdir = exim_opendir(scandir); entry = readdir(tempdir); )
1465 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1467 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1469 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1475 if (rfc822_file_path)
1477 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1479 /* set RFC822 expansion variable */
1481 mime_part_count_buffer = mime_part_count;
1482 goto MIME_ACL_CHECK;
1484 log_write(0, LOG_PANIC,
1485 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1486 unlink(CS rfc822_file_path);
1491 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1494 recipients_count = 0;
1495 *blackholed_by_ptr = US"MIME ACL";
1496 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1500 Uunlink(spool_name);
1501 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1503 #ifdef EXPERIMENTAL_DCC
1508 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1509 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1510 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1512 message_id[0] = 0; /* Indicate no message accepted */
1513 return FALSE; /* Cause skip to end of receive function */
1519 #endif /* WITH_CONTENT_SCAN */
1524 received_header_gen(void)
1527 uschar * timestamp = expand_string(US"${tod_full}");
1528 header_line * received_header= header_list;
1530 if (recipients_count == 1) received_for = recipients_list[0].address;
1531 received = expand_string(received_header_text);
1532 received_for = NULL;
1536 if(spool_name[0] != 0)
1537 Uunlink(spool_name); /* Lose the data file */
1538 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1539 "(received_header_text) failed: %s", string_printing(received_header_text),
1540 expand_string_message);
1543 /* The first element on the header chain is reserved for the Received header,
1544 so all we have to do is fill in the text pointer, and set the type. However, if
1545 the result of the expansion is an empty string, we leave the header marked as
1546 "old" so as to refrain from adding a Received header. */
1550 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1551 received_header->type = htype_old;
1555 received_header->text = string_sprintf("%s;\n\t%s\n", received, timestamp);
1556 received_header->type = htype_received;
1559 received_header->slen = Ustrlen(received_header->text);
1561 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1562 received_header->type, received_header->text);
1567 /*************************************************
1569 *************************************************/
1571 /* Receive a message on the given input, and put it into a pair of spool files.
1572 Either a non-null list of recipients, or the extract flag will be true, or
1573 both. The flag sender_local is true for locally generated messages. The flag
1574 submission_mode is true if an ACL has obeyed "control = submission". The flag
1575 suppress_local_fixups is true if an ACL has obeyed "control =
1576 suppress_local_fixups" or -G was passed on the command-line.
1577 The flag smtp_input is true if the message is to be
1578 handled using SMTP conventions about termination and lines starting with dots.
1579 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1581 If a message was successfully read, message_id[0] will be non-zero.
1583 The general actions of this function are:
1585 . Read the headers of the message (if any) into a chain of store
1588 . If there is a "sender:" header and the message is locally originated,
1589 throw it away, unless the caller is trusted, or unless
1590 active_local_sender_retain is set - which can only happen if
1591 active_local_from_check is false.
1593 . If recipients are to be extracted from the message, build the
1594 recipients list from the headers, removing any that were on the
1595 original recipients list (unless extract_addresses_remove_arguments is
1596 false), and at the same time, remove any bcc header that may be present.
1598 . Get the spool file for the data, sort out its unique name, open
1599 and lock it (but don't give it the name yet).
1601 . Generate a "Message-Id" header if the message doesn't have one, for
1602 locally-originated messages.
1604 . Generate a "Received" header.
1606 . Ensure the recipients list is fully qualified and rewritten if necessary.
1608 . If there are any rewriting rules, apply them to the sender address
1609 and also to the headers.
1611 . If there is no from: header, generate one, for locally-generated messages
1612 and messages in "submission mode" only.
1614 . If the sender is local, check that from: is correct, and if not, generate
1615 a Sender: header, unless message comes from a trusted caller, or this
1616 feature is disabled by active_local_from_check being false.
1618 . If there is no "date" header, generate one, for locally-originated
1619 or submission mode messages only.
1621 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1622 dot_ends mode, to the data file. Leave it open, to hold the lock.
1624 . Write the envelope and the headers to a new file.
1626 . Set the name for the header file; close it.
1628 . Set the name for the data file; close it.
1630 Because this function can potentially be called many times in a single
1631 SMTP connection, all store should be got by store_get(), so that it will be
1632 automatically retrieved after the message is accepted.
1634 FUDGE: It seems that sites on the net send out messages with just LF
1635 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1636 we make the CRs optional in all cases.
1638 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1639 new regime is now in place in which bare CRs in header lines are turned into LF
1640 followed by a space, so as not to terminate the header line.
1642 February 2004: A bare LF in a header line in a message whose first line was
1643 terminated by CRLF is treated in the same way as a bare CR.
1646 extract_recip TRUE if recipients are to be extracted from the message's
1649 Returns: TRUE there are more messages to be read (SMTP input)
1650 FALSE there are no more messages to be read (non-SMTP input
1651 or SMTP connection collapsed, or other failure)
1653 When reading a message for filter testing, the returned value indicates
1654 whether the headers (which is all that is read) were terminated by '.' or
1658 receive_msg(BOOL extract_recip)
1662 int process_info_len = Ustrlen(process_info);
1663 int error_rc = error_handling == ERRORS_SENDER
1664 ? errors_sender_rc : EXIT_FAILURE;
1665 int header_size = 256;
1666 int id_resolution = 0;
1668 int prevlines_length = 0;
1672 BOOL contains_resent_headers = FALSE;
1673 BOOL extracted_ignored = FALSE;
1674 BOOL first_line_ended_crlf = TRUE_UNSET;
1675 BOOL smtp_yield = TRUE;
1678 BOOL resents_exist = FALSE;
1679 uschar *resent_prefix = US"";
1680 uschar *blackholed_by = NULL;
1681 uschar *blackhole_log_msg = US"";
1682 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1685 error_block *bad_addresses = NULL;
1687 uschar *frozen_by = NULL;
1688 uschar *queued_by = NULL;
1691 rmark rcvd_log_reset_point;
1693 struct stat statbuf;
1695 /* Final message to give to SMTP caller, and messages from ACLs */
1697 uschar *smtp_reply = NULL;
1698 uschar *user_msg, *log_msg;
1700 /* Working header pointers */
1705 /* Flags for noting the existence of certain headers (only one left) */
1707 BOOL date_header_exists = FALSE;
1709 /* Pointers to receive the addresses of headers whose contents we need. */
1711 header_line *from_header = NULL;
1712 header_line *subject_header = NULL;
1713 header_line *msgid_header = NULL;
1714 header_line *received_header;
1715 BOOL msgid_header_newly_created = FALSE;
1717 /* Variables for use when building the Received: header. */
1723 /* Release any open files that might have been cached while preparing to
1724 accept the message - e.g. by verifying addresses - because reading a message
1725 might take a fair bit of real time. */
1729 /* Extracting the recipient list from an input file is incompatible with
1730 cutthrough delivery with the no-spool option. It shouldn't be possible
1731 to set up the combination, but just in case kill any ongoing connection. */
1732 if (extract_recip || !smtp_input)
1733 cancel_cutthrough_connection(TRUE, US"not smtp input");
1735 /* Initialize the chain of headers by setting up a place-holder for Received:
1736 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1737 pointing to the end of the chain to make adding headers simple. */
1739 received_header = header_list = header_last = store_get(sizeof(header_line), FALSE);
1740 header_list->next = NULL;
1741 header_list->type = htype_old;
1742 header_list->text = NULL;
1743 header_list->slen = 0;
1745 /* Control block for the next header to be read. */
1747 reset_point = store_mark();
1748 next = store_get(sizeof(header_line), FALSE); /* not tainted */
1749 next->text = store_get(header_size, TRUE); /* tainted */
1751 /* Initialize message id to be null (indicating no message read), and the
1752 header names list to be the normal list. Indicate there is no data file open
1753 yet, initialize the size and warning count, and deal with no size limit. */
1756 spool_data_file = NULL;
1761 received_count = 1; /* For the one we will add */
1763 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1765 /* While reading the message, the following counts are computed. */
1767 message_linecount = body_linecount = body_zerocount =
1768 max_received_linelength = 0;
1770 #ifdef WITH_CONTENT_SCAN
1771 /* reset non-per-part mime variables */
1772 mime_is_coverletter = 0;
1774 mime_part_count = -1;
1777 #ifndef DISABLE_DKIM
1778 /* Call into DKIM to set up the context. In CHUNKING mode
1779 we clear the dot-stuffing flag */
1780 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1781 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1784 #ifdef SUPPORT_DMARC
1785 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1788 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1789 ids, and fractions of a second are required. See the comments that precede the
1790 message id creation below.
1791 We use a routine that if possible uses a monotonic clock, and can be used again
1792 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1794 exim_gettime(&message_id_tv);
1796 /* For other uses of the received time we can operate with granularity of one
1797 second, and for that we use the global variable received_time. This is for
1798 things like ultimate message timeouts.
1799 For this we do not care about the Linux suspend/resume problem, so rather than
1800 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1802 gettimeofday(&received_time, NULL);
1804 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1805 happen in the smtp_getc() function when it refills its buffer. */
1807 had_data_timeout = 0;
1809 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1811 /* If not SMTP input, timeout happens only if configured, and we just set a
1812 single timeout for the whole message. */
1814 else if (receive_timeout > 0)
1816 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1817 ALARM(receive_timeout);
1820 /* SIGTERM and SIGINT are caught always. */
1822 had_data_sigint = 0;
1823 signal(SIGTERM, data_sigterm_sigint_handler);
1824 signal(SIGINT, data_sigterm_sigint_handler);
1826 /* Header lines in messages are not supposed to be very long, though when
1827 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1828 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1829 storing the header, and extend this as necessary using string_cat().
1831 To cope with total lunacies, impose an upper limit on the length of the header
1832 section of the message, as otherwise the store will fill up. We must also cope
1833 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1834 Folded header lines are joined into one string, leaving the '\n' characters
1835 inside them, so that writing them out reproduces the input.
1837 Loop for each character of each header; the next structure for chaining the
1838 header is set up already, with ptr the offset of the next character in
1843 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1845 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1846 SMTP must have a correct "." terminator. */
1848 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1850 smtp_reply = handle_lost_connection(US" (header)");
1852 goto TIDYUP; /* Skip to end of function */
1855 /* See if we are at the current header's size limit - there must be at least
1856 four bytes left. This allows for the new character plus a zero, plus two for
1857 extra insertions when we are playing games with dots and carriage returns. If
1858 we are at the limit, extend the text buffer. This could have been done
1859 automatically using string_cat() but because this is a tightish loop storing
1860 only one character at a time, we choose to do it inline. Normally
1861 store_extend() will be able to extend the block; only at the end of a big
1862 store block will a copy be needed. To handle the case of very long headers
1863 (and sometimes lunatic messages can have ones that are 100s of K long) we
1864 call store_release() for strings that have been copied - if the string is at
1865 the start of a block (and therefore the only thing in it, because we aren't
1866 doing any other gets), the block gets freed. We can only do this release if
1867 there were no allocations since the once that we want to free. */
1869 if (ptr >= header_size - 4)
1871 int oldsize = header_size;
1873 if (header_size >= INT_MAX/2)
1877 /* The data came from the message, so is tainted. */
1879 if (!store_extend(next->text, TRUE, oldsize, header_size))
1880 next->text = store_newblock(next->text, TRUE, header_size, ptr);
1883 /* Cope with receiving a binary zero. There is dispute about whether
1884 these should be allowed in RFC 822 messages. The middle view is that they
1885 should not be allowed in headers, at least. Exim takes this attitude at
1886 the moment. We can't just stomp on them here, because we don't know that
1887 this line is a header yet. Set a flag to cause scanning later. */
1889 if (ch == 0) had_zero++;
1891 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1892 those from data files use just LF. Treat LF in local SMTP input as a
1893 terminator too. Treat EOF as a line terminator always. */
1895 if (ch == EOF) goto EOL;
1897 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1898 other MTAs accept this. We are therefore forced into this "liberalisation"
1899 too, so we accept LF as a line terminator whatever the source of the message.
1900 However, if the first line of the message ended with a CRLF, we treat a bare
1901 LF specially by inserting a white space after it to ensure that the header
1902 line is not terminated. */
1906 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1907 else if (first_line_ended_crlf) receive_ungetc(' ');
1911 /* This is not the end of the line. If this is SMTP input and this is
1912 the first character in the line and it is a "." character, ignore it.
1913 This implements the dot-doubling rule, though header lines starting with
1914 dots aren't exactly common. They are legal in RFC 822, though. If the
1915 following is CRLF or LF, this is the line that that terminates the
1916 entire message. We set message_ended to indicate this has happened (to
1917 prevent further reading), and break out of the loop, having freed the
1918 empty header, and set next = NULL to indicate no data line. */
1920 if (ptr == 0 && ch == '.' && f.dot_ends)
1922 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1925 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1929 ch = '\r'; /* Revert to CR */
1934 message_ended = END_DOT;
1935 reset_point = store_reset(reset_point);
1937 break; /* End character-reading loop */
1940 /* For non-SMTP input, the dot at the start of the line was really a data
1941 character. What is now in ch is the following character. We guaranteed
1942 enough space for this above. */
1946 next->text[ptr++] = '.';
1951 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1952 remember this case if this is the first line ending. */
1956 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1959 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1963 /* Otherwise, put back the character after CR, and turn the bare CR
1966 ch = (receive_ungetc)(ch);
1967 next->text[ptr++] = '\n';
1972 /* We have a data character for the header line. */
1974 next->text[ptr++] = ch; /* Add to buffer */
1975 message_size++; /* Total message size so far */
1977 /* Handle failure due to a humungously long header section. The >= allows
1978 for the terminating \n. Add what we have so far onto the headers list so
1979 that it gets reflected in any error message, and back up the just-read
1982 if (message_size >= header_maxsize)
1985 next->text[ptr] = 0;
1987 next->type = htype_other;
1989 header_last->next = next;
1992 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1993 "%s (more than %d characters): message abandoned",
1994 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1998 smtp_reply = US"552 Message header is ridiculously long";
1999 receive_swallow_smtp();
2000 goto TIDYUP; /* Skip to end of function */
2005 give_local_error(ERRMESS_VLONGHEADER,
2006 string_sprintf("message header longer than %d characters received: "
2007 "message not accepted", header_maxsize), US"", error_rc, stdin,
2009 /* Does not return */
2013 continue; /* With next input character */
2015 /* End of header line reached */
2019 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2021 receive_linecount++;
2022 message_linecount++;
2024 /* Keep track of maximum line length */
2026 if (ptr - prevlines_length > max_received_linelength)
2027 max_received_linelength = ptr - prevlines_length;
2028 prevlines_length = ptr + 1;
2030 /* Now put in the terminating newline. There is always space for
2031 at least two more characters. */
2033 next->text[ptr++] = '\n';
2036 /* A blank line signals the end of the headers; release the unwanted
2037 space and set next to NULL to indicate this. */
2041 reset_point = store_reset(reset_point);
2046 /* There is data in the line; see if the next input character is a
2047 whitespace character. If it is, we have a continuation of this header line.
2048 There is always space for at least one character at this point. */
2052 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2053 if (nextch == ' ' || nextch == '\t')
2055 next->text[ptr++] = nextch;
2056 if (++message_size >= header_maxsize)
2058 continue; /* Iterate the loop */
2060 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2061 else ch = EOF; /* Cause main loop to exit at end */
2064 /* We have got to the real line end. Terminate the string and release store
2065 beyond it. If it turns out to be a real header, internal binary zeros will
2066 be squashed later. */
2068 next->text[ptr] = 0;
2070 store_release_above(next->text + ptr + 1);
2072 /* Check the running total size against the overall message size limit. We
2073 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2074 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2075 headers - the code to read the body will then also hit the buffer. */
2077 if (message_size > thismessage_size_limit) break;
2079 /* A line that is not syntactically correct for a header also marks
2080 the end of the headers. In this case, we leave next containing the
2081 first data line. This might actually be several lines because of the
2082 continuation logic applied above, but that doesn't matter.
2084 It turns out that smail, and presumably sendmail, accept leading lines
2087 From ph10 Fri Jan 5 12:35 GMT 1996
2089 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2090 find any documentation of this, but for compatibility it had better be
2091 accepted. Exim restricts it to the case of non-smtp messages, and
2092 treats it as an alternative to the -f command line option. Thus it is
2093 ignored except for trusted users or filter testing. Otherwise it is taken
2094 as the sender address, unless -f was used (sendmail compatibility).
2096 It further turns out that some UUCPs generate the From_line in a different
2099 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2101 The regex for matching these things is now capable of recognizing both
2102 formats (including 2- and 4-digit years in the latter). In fact, the regex
2103 is now configurable, as is the expansion string to fish out the sender.
2105 Even further on it has been discovered that some broken clients send
2106 these lines in SMTP messages. There is now an option to ignore them from
2107 specified hosts or networks. Sigh. */
2109 if ( header_last == header_list
2111 || ( sender_host_address
2112 && verify_check_host(&ignore_fromline_hosts) == OK
2114 || (!sender_host_address && ignore_fromline_local)
2116 && regex_match_and_setup(regex_From, next->text, 0, -1)
2119 if (!f.sender_address_forced)
2121 uschar *uucp_sender = expand_string(uucp_from_sender);
2123 log_write(0, LOG_MAIN|LOG_PANIC,
2124 "expansion of \"%s\" failed after matching "
2125 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2128 int start, end, domain;
2130 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2131 &start, &end, &domain, TRUE);
2134 if (domain == 0 && newsender[0] != 0)
2135 /* deconst ok as newsender was not const */
2136 newsender = US rewrite_address_qualify(newsender, FALSE);
2138 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2140 sender_address = newsender;
2142 if (f.trusted_caller || filter_test != FTEST_NONE)
2144 authenticated_sender = NULL;
2145 originator_name = US"";
2146 f.sender_local = FALSE;
2149 if (filter_test != FTEST_NONE)
2150 printf("Sender taken from \"From \" line\n");
2157 /* Not a leading "From " line. Check to see if it is a valid header line.
2158 Header names may contain any non-control characters except space and colon,
2163 uschar *p = next->text;
2165 /* If not a valid header line, break from the header reading loop, leaving
2166 next != NULL, indicating that it holds the first line of the body. */
2168 if (isspace(*p)) break;
2169 while (mac_isgraph(*p) && *p != ':') p++;
2170 while (isspace(*p)) p++;
2173 body_zerocount = had_zero;
2177 /* We have a valid header line. If there were any binary zeroes in
2178 the line, stomp on them here. */
2181 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2184 /* It is perfectly legal to have an empty continuation line
2185 at the end of a header, but it is confusing to humans
2186 looking at such messages, since it looks like a blank line.
2187 Reduce confusion by removing redundant white space at the
2188 end. We know that there is at least one printing character
2189 (the ':' tested for above) so there is no danger of running
2192 p = next->text + ptr - 2;
2195 while (*p == ' ' || *p == '\t') p--;
2196 if (*p != '\n') break;
2197 ptr = (p--) - next->text + 1;
2198 message_size -= next->slen - ptr;
2199 next->text[ptr] = 0;
2203 /* Add the header to the chain */
2205 next->type = htype_other;
2207 header_last->next = next;
2210 /* Check the limit for individual line lengths. This comes after adding to
2211 the chain so that the failing line is reflected if a bounce is generated
2212 (for a local message). */
2214 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2216 log_write(0, LOG_MAIN, "overlong message header line received from "
2217 "%s (more than %d characters): message abandoned",
2218 f.sender_host_unknown ? sender_ident : sender_fullhost,
2219 header_line_maxsize);
2223 smtp_reply = US"552 A message header line is too long";
2224 receive_swallow_smtp();
2225 goto TIDYUP; /* Skip to end of function */
2229 give_local_error(ERRMESS_VLONGHDRLINE,
2230 string_sprintf("message header line longer than %d characters "
2231 "received: message not accepted", header_line_maxsize), US"",
2232 error_rc, stdin, header_list->next);
2233 /* Does not return */
2236 /* Note if any resent- fields exist. */
2238 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2240 resents_exist = TRUE;
2241 resent_prefix = US"Resent-";
2245 /* Reject CHUNKING messages that do not CRLF their first header line */
2247 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2249 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2250 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2252 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2253 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2254 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2257 goto TIDYUP; /* Skip to end of function */
2260 /* The line has been handled. If we have hit EOF, break out of the loop,
2261 indicating no pending data line. */
2263 if (ch == EOF) { next = NULL; break; }
2265 /* Set up for the next header */
2267 reset_point = store_mark();
2269 next = store_get(sizeof(header_line), FALSE);
2270 next->text = store_get(header_size, TRUE);
2273 prevlines_length = 0;
2274 } /* Continue, starting to read the next header */
2276 /* At this point, we have read all the headers into a data structure in main
2277 store. The first header is still the dummy placeholder for the Received: header
2278 we are going to generate a bit later on. If next != NULL, it contains the first
2279 data line - which terminated the headers before reaching a blank line (not the
2284 debug_printf(">>Headers received:\n");
2285 for (header_line * h = header_list->next; h; h = h->next)
2286 debug_printf("%s", h->text);
2290 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2291 is dropped immediately after valid headers, the next thing we will see is EOF.
2292 We must test for this specially, as further down the reading of the data is
2293 skipped if already at EOF. */
2295 if (smtp_input && (receive_feof)())
2297 smtp_reply = handle_lost_connection(US" (after header)");
2299 goto TIDYUP; /* Skip to end of function */
2302 /* If this is a filter test run and no headers were read, output a warning
2303 in case there is a mistake in the test message. */
2305 if (filter_test != FTEST_NONE && header_list->next == NULL)
2306 printf("Warning: no message headers read\n");
2309 /* Scan the headers to identify them. Some are merely marked for later
2310 processing; some are dealt with here. */
2312 for (header_line * h = header_list->next; h; h = h->next)
2314 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2315 if (is_resent) contains_resent_headers = TRUE;
2317 switch (header_checkname(h, is_resent))
2320 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2324 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2327 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2330 if (!resents_exist || is_resent) date_header_exists = TRUE;
2333 /* Same comments as about Return-Path: below. */
2335 case htype_delivery_date:
2336 if (delivery_date_remove) h->type = htype_old;
2339 /* Same comments as about Return-Path: below. */
2341 case htype_envelope_to:
2342 if (envelope_to_remove) h->type = htype_old;
2345 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2346 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2347 header consists of just the login id of the user who called Exim, rewrite
2348 it with the gecos field first. Apply this rule to Resent-From: if there
2349 are resent- fields. */
2352 h->type = htype_from;
2353 if (!resents_exist || is_resent)
2359 uschar *s = Ustrchr(h->text, ':') + 1;
2360 while (isspace(*s)) s++;
2361 len = h->slen - (s - h->text) - 1;
2362 if (Ustrlen(originator_login) == len &&
2363 strncmpic(s, originator_login, len) == 0)
2365 uschar *name = is_resent? US"Resent-From" : US"From";
2366 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2367 originator_login, qualify_domain_sender);
2368 from_header = header_last;
2369 h->type = htype_old;
2370 DEBUG(D_receive|D_rewrite)
2371 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2377 /* Identify the Message-id: header for generating "in-reply-to" in the
2378 autoreply transport. For incoming logging, save any resent- value. In both
2379 cases, take just the first of any multiples. */
2382 if (!msgid_header && (!resents_exist || is_resent))
2389 /* Flag all Received: headers */
2391 case htype_received:
2392 h->type = htype_received;
2396 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2398 case htype_reply_to:
2399 h->type = htype_reply_to;
2402 /* The Return-path: header is supposed to be added to messages when
2403 they leave the SMTP system. We shouldn't receive messages that already
2404 contain Return-path. However, since Exim generates Return-path: on
2405 local delivery, resent messages may well contain it. We therefore
2406 provide an option (which defaults on) to remove any Return-path: headers
2407 on input. Removal actually means flagging as "old", which prevents the
2408 header being transmitted with the message. */
2410 case htype_return_path:
2411 if (return_path_remove) h->type = htype_old;
2413 /* If we are testing a mail filter file, use the value of the
2414 Return-Path: header to set up the return_path variable, which is not
2415 otherwise set. However, remove any <> that surround the address
2416 because the variable doesn't have these. */
2418 if (filter_test != FTEST_NONE)
2420 uschar *start = h->text + 12;
2421 uschar *end = start + Ustrlen(start);
2422 while (isspace(*start)) start++;
2423 while (end > start && isspace(end[-1])) end--;
2424 if (*start == '<' && end[-1] == '>')
2429 return_path = string_copyn(start, end - start);
2430 printf("Return-path taken from \"Return-path:\" header line\n");
2434 /* If there is a "Sender:" header and the message is locally originated,
2435 and from an untrusted caller and suppress_local_fixups is not set, or if we
2436 are in submission mode for a remote message, mark it "old" so that it will
2437 not be transmitted with the message, unless active_local_sender_retain is
2438 set. (This can only be true if active_local_from_check is false.) If there
2439 are any resent- headers in the message, apply this rule to Resent-Sender:
2440 instead of Sender:. Messages with multiple resent- header sets cannot be
2441 tidily handled. (For this reason, at least one MUA - Pine - turns old
2442 resent- headers into X-resent- headers when resending, leaving just one
2446 h->type = !f.active_local_sender_retain
2447 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2448 || f.submission_mode
2450 && (!resents_exist || is_resent)
2451 ? htype_old : htype_sender;
2454 /* Remember the Subject: header for logging. There is no Resent-Subject */
2460 /* "To:" gets flagged, and the existence of a recipient header is noted,
2461 whether it's resent- or not. */
2466 to_or_cc_header_exists = TRUE;
2472 /* Extract recipients from the headers if that is required (the -t option).
2473 Note that this is documented as being done *before* any address rewriting takes
2474 place. There are two possibilities:
2476 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2477 recipients already listed are to be REMOVED from the message. Smail 3 works
2478 like this. We need to build a non-recipients tree for that list, because in
2479 subsequent processing this data is held in a tree and that's what the
2480 spool_write_header() function expects. Make sure that non-recipient addresses
2481 are fully qualified and rewritten if necessary.
2483 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2484 those in the command line arguments (and it is rumoured some other MTAs do
2485 this). Therefore, there is an option to make Exim behave this way.
2487 *** Notes on "Resent-" header lines ***
2489 The presence of resent-headers in the message makes -t horribly ambiguous.
2490 Experiments with sendmail showed that it uses recipients for all resent-
2491 headers, totally ignoring the concept of "sets of resent- headers" as described
2492 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2493 with all the addresses in one instance of each header.
2495 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2496 error for -t if there were resent- headers in the message. However, after a
2497 discussion on the mailing list, I've learned that there are MUAs that use
2498 resent- headers with -t, and also that the stuff about sets of resent- headers
2499 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2500 message with -t and resent- header lines makes sure that only *its* resent-
2501 headers are present; previous ones are often renamed as X-resent- for example.
2503 Consequently, Exim has been changed so that, if any resent- header lines are
2504 present, the recipients are taken from all of the appropriate resent- lines,
2505 and not from the ordinary To:, Cc:, etc. */
2510 error_block **bnext = &bad_addresses;
2512 if (extract_addresses_remove_arguments)
2514 while (recipients_count-- > 0)
2516 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2517 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2518 tree_add_nonrecipient(s);
2520 recipients_list = NULL;
2521 recipients_count = recipients_list_max = 0;
2524 /* Now scan the headers */
2526 for (header_line * h = header_list->next; h; h = h->next)
2528 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2529 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2531 uschar *s = Ustrchr(h->text, ':') + 1;
2532 while (isspace(*s)) s++;
2534 f.parse_allow_group = TRUE; /* Allow address group syntax */
2538 uschar *ss = parse_find_address_end(s, FALSE);
2539 uschar *recipient, *errmess, *pp;
2540 int start, end, domain;
2542 /* Check on maximum */
2544 if (recipients_max > 0 && ++rcount > recipients_max)
2545 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2546 US"message rejected: ", error_rc, stdin, NULL);
2547 /* Does not return */
2549 /* Make a copy of the address, and remove any internal newlines. These
2550 may be present as a result of continuations of the header line. The
2551 white space that follows the newline must not be removed - it is part
2554 pp = recipient = store_get(ss - s + 1, is_tainted(s));
2555 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2560 BOOL b = allow_utf8_domains;
2561 allow_utf8_domains = TRUE;
2563 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2568 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2569 else allow_utf8_domains = b;
2575 /* Keep a list of all the bad addresses so we can send a single
2576 error message at the end. However, an empty address is not an error;
2577 just ignore it. This can come from an empty group list like
2579 To: Recipients of list:;
2581 If there are no recipients at all, an error will occur later. */
2583 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2585 int len = Ustrlen(s);
2586 error_block *b = store_get(sizeof(error_block), FALSE);
2587 while (len > 0 && isspace(s[len-1])) len--;
2589 b->text1 = string_printing(string_copyn(s, len));
2595 /* If the recipient is already in the nonrecipients tree, it must
2596 have appeared on the command line with the option extract_addresses_
2597 remove_arguments set. Do not add it to the recipients, and keep a note
2598 that this has happened, in order to give a better error if there are
2599 no recipients left. */
2601 else if (recipient != NULL)
2603 if (tree_search(tree_nonrecipients, recipient) == NULL)
2604 receive_add_recipient(recipient, -1);
2606 extracted_ignored = TRUE;
2609 /* Move on past this address */
2611 s = ss + (*ss? 1:0);
2612 while (isspace(*s)) s++;
2613 } /* Next address */
2615 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2616 f.parse_found_group = FALSE;
2618 /* If this was the bcc: header, mark it "old", which means it
2619 will be kept on the spool, but not transmitted as part of the
2622 if (h->type == htype_bcc) h->type = htype_old;
2623 } /* For appropriate header line */
2624 } /* For each header line */
2628 /* Now build the unique message id. This has changed several times over the
2629 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2630 Retaining all the history in the comment has become too unwieldy - read
2631 previous release sources if you want it.
2633 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2634 The first part is the current time, in seconds. The second part is the current
2635 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2636 can hold a number in the range 0-3843. It used to be a computed sequence
2637 number, but is now the fractional component of the current time in units of
2638 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2639 received, Exim ensures that the timer has ticked at the appropriate level
2640 before proceeding, to avoid duplication if the pid happened to be re-used
2641 within the same time period. It seems likely that most messages will take at
2642 least half a millisecond to be received, so no delay will normally be
2643 necessary. At least for some time...
2645 There is a modification when localhost_number is set. Formerly this was allowed
2646 to be as large as 255. Now it is restricted to the range 0-16, and the final
2647 component of the message id becomes (localhost_number * 200) + fractional time
2648 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2650 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2651 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2652 still allows the tttttt field to hold a large enough number to last for some
2653 more decades, and the final two-digit field can hold numbers up to 1295, which
2654 is enough for milliseconds (instead of 1/2000 of a second).
2656 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2657 pid, so it is probably safe because pids have to be positive. The
2658 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2659 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2661 Note that string_base62() returns its data in a static storage block, so it
2662 must be copied before calling string_base62() again. It always returns exactly
2665 There doesn't seem to be anything in the RFC which requires a message id to
2666 start with a letter, but Smail was changed to ensure this. The external form of
2667 the message id (as supplied by string expansion) therefore starts with an
2668 additional leading 'E'. The spool file names do not include this leading
2669 letter and it is not used internally.
2671 NOTE: If ever the format of message ids is changed, the regular expression for
2672 checking that a string is in this format must be updated in a corresponding
2673 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2674 must also be changed to reflect the correct string length. The queue-sort code
2675 needs to know the layout. Then, of course, other programs that rely on the
2676 message id format will need updating too. */
2678 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2679 message_id[6] = '-';
2680 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2682 /* Deal with the case where the host number is set. The value of the number was
2683 checked when it was read, to ensure it isn't too big. The timing granularity is
2684 left in id_resolution so that an appropriate wait can be done after receiving
2685 the message, if necessary (we hope it won't be). */
2687 if (host_number_string)
2689 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2690 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2691 string_base62((long int)(
2692 host_number * (1000000/id_resolution) +
2693 message_id_tv.tv_usec/id_resolution)) + 4);
2696 /* Host number not set: final field is just the fractional time at an
2697 appropriate resolution. */
2701 id_resolution = BASE_62 == 62 ? 500 : 1000;
2702 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2703 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2706 /* Add the current message id onto the current process info string if
2709 (void)string_format(process_info + process_info_len,
2710 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2712 /* If we are using multiple input directories, set up the one for this message
2713 to be the least significant base-62 digit of the time of arrival. Otherwise
2714 ensure that it is an empty string. */
2716 set_subdir_str(message_subdir, message_id, 0);
2718 /* Now that we have the message-id, if there is no message-id: header, generate
2719 one, but only for local (without suppress_local_fixups) or submission mode
2720 messages. This can be user-configured if required, but we had better flatten
2721 any illegal characters therein. */
2724 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2726 uschar *id_text = US"";
2727 uschar *id_domain = primary_hostname;
2730 /* Permit only letters, digits, dots, and hyphens in the domain */
2732 if (message_id_domain)
2734 uschar *new_id_domain = expand_string(message_id_domain);
2737 if (!f.expand_string_forcedfail)
2738 log_write(0, LOG_MAIN|LOG_PANIC,
2739 "expansion of \"%s\" (message_id_header_domain) "
2740 "failed: %s", message_id_domain, expand_string_message);
2742 else if (*new_id_domain)
2744 id_domain = new_id_domain;
2745 for (uschar * p = id_domain; *p; p++)
2746 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2750 /* Permit all characters except controls and RFC 2822 specials in the
2751 additional text part. */
2753 if (message_id_text)
2755 uschar *new_id_text = expand_string(message_id_text);
2758 if (!f.expand_string_forcedfail)
2759 log_write(0, LOG_MAIN|LOG_PANIC,
2760 "expansion of \"%s\" (message_id_header_text) "
2761 "failed: %s", message_id_text, expand_string_message);
2763 else if (*new_id_text)
2765 id_text = new_id_text;
2766 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2770 /* Add the header line.
2771 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2772 appended, to preserve classical expectations of header ordering. */
2774 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2775 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2776 *id_text == 0 ? "" : ".", id_text, id_domain);
2778 /* Arrange for newly-created Message-Id to be logged */
2782 msgid_header_newly_created = TRUE;
2787 /* If we are to log recipients, keep a copy of the raw ones before any possible
2788 rewriting. Must copy the count, because later ACLs and the local_scan()
2789 function may mess with the real recipients. */
2791 if (LOGGING(received_recipients))
2793 raw_recipients = store_get(recipients_count * sizeof(uschar *), FALSE);
2794 for (int i = 0; i < recipients_count; i++)
2795 raw_recipients[i] = string_copy(recipients_list[i].address);
2796 raw_recipients_count = recipients_count;
2799 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2800 recipients will get here only if the conditions were right (allow_unqualified_
2801 recipient is TRUE). */
2803 for (int i = 0; i < recipients_count; i++)
2804 recipients_list[i].address = /* deconst ok as src was not cont */
2805 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2806 global_rewrite_rules, rewrite_existflags);
2808 /* If there is no From: header, generate one for local (without
2809 suppress_local_fixups) or submission_mode messages. If there is no sender
2810 address, but the sender is local or this is a local delivery error, use the
2811 originator login. This shouldn't happen for genuine bounces, but might happen
2812 for autoreplies. The addition of From: must be done *before* checking for the
2813 possible addition of a Sender: header, because untrusted_set_sender allows an
2814 untrusted user to set anything in the envelope (which might then get info
2815 From:) but we still want to ensure a valid Sender: if it is required. */
2818 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2820 const uschar * oname = US"";
2822 /* Use the originator_name if this is a locally submitted message and the
2823 caller is not trusted. For trusted callers, use it only if -F was used to
2824 force its value or if we have a non-SMTP message for which -f was not used
2825 to set the sender. */
2827 if (!sender_host_address)
2829 if (!f.trusted_caller || f.sender_name_forced ||
2830 (!smtp_input && !f.sender_address_forced))
2831 oname = originator_name;
2834 /* For non-locally submitted messages, the only time we use the originator
2835 name is when it was forced by the /name= option on control=submission. */
2837 else if (submission_name) oname = submission_name;
2839 /* Envelope sender is empty */
2841 if (!*sender_address)
2843 uschar *fromstart, *fromend;
2845 fromstart = string_sprintf("%sFrom: %s%s",
2846 resent_prefix, oname, *oname ? " <" : "");
2847 fromend = *oname ? US">" : US"";
2849 if (f.sender_local || f.local_error_message)
2850 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2851 local_part_quote(originator_login), qualify_domain_sender,
2854 else if (f.submission_mode && authenticated_id)
2856 if (!submission_domain)
2857 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2858 local_part_quote(authenticated_id), qualify_domain_sender,
2861 else if (!*submission_domain) /* empty => whole address set */
2862 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2866 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2867 local_part_quote(authenticated_id), submission_domain, fromend);
2869 from_header = header_last; /* To get it checked for Sender: */
2873 /* There is a non-null envelope sender. Build the header using the original
2874 sender address, before any rewriting that might have been done while
2879 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2882 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2885 from_header = header_last; /* To get it checked for Sender: */
2890 /* If the sender is local (without suppress_local_fixups), or if we are in
2891 submission mode and there is an authenticated_id, check that an existing From:
2892 is correct, and if not, generate a Sender: header, unless disabled. Any
2893 previously-existing Sender: header was removed above. Note that sender_local,
2894 as well as being TRUE if the caller of exim is not trusted, is also true if a
2895 trusted caller did not supply a -f argument for non-smtp input. To allow
2896 trusted callers to forge From: without supplying -f, we have to test explicitly
2897 here. If the From: header contains more than one address, then the call to
2898 parse_extract_address fails, and a Sender: header is inserted, as required. */
2901 && ( f.active_local_from_check
2902 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2903 || f.submission_mode && authenticated_id
2906 BOOL make_sender = TRUE;
2907 int start, end, domain;
2909 uschar *from_address =
2910 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2911 &start, &end, &domain, FALSE);
2912 uschar *generated_sender_address;
2914 generated_sender_address = f.submission_mode
2915 ? !submission_domain
2916 ? string_sprintf("%s@%s",
2917 local_part_quote(authenticated_id), qualify_domain_sender)
2918 : !*submission_domain /* empty => full address */
2919 ? string_sprintf("%s", authenticated_id)
2920 : string_sprintf("%s@%s",
2921 local_part_quote(authenticated_id), submission_domain)
2922 : string_sprintf("%s@%s",
2923 local_part_quote(originator_login), qualify_domain_sender);
2925 /* Remove permitted prefixes and suffixes from the local part of the From:
2926 address before doing the comparison with the generated sender. */
2931 uschar *at = domain ? from_address + domain - 1 : NULL;
2934 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2935 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2937 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2938 from_address += slen;
2942 if ( strcmpic(generated_sender_address, from_address) == 0
2943 || (!domain && strcmpic(from_address, originator_login) == 0))
2944 make_sender = FALSE;
2947 /* We have to cause the Sender header to be rewritten if there are
2948 appropriate rewriting rules. */
2951 if (f.submission_mode && !submission_name)
2952 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2953 generated_sender_address);
2955 header_add(htype_sender, "%sSender: %s <%s>\n",
2957 f.submission_mode ? submission_name : originator_name,
2958 generated_sender_address);
2960 /* Ensure that a non-null envelope sender address corresponds to the
2961 submission mode sender address. */
2963 if (f.submission_mode && *sender_address)
2965 if (!sender_address_unrewritten)
2966 sender_address_unrewritten = sender_address;
2967 sender_address = generated_sender_address;
2968 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2969 log_write(L_address_rewrite, LOG_MAIN,
2970 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2971 sender_address_unrewritten, generated_sender_address);
2975 /* If there are any rewriting rules, apply them to the sender address, unless
2976 it has already been rewritten as part of verification for SMTP input. */
2978 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2980 /* deconst ok as src was not const */
2981 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
2982 global_rewrite_rules, rewrite_existflags);
2983 DEBUG(D_receive|D_rewrite)
2984 debug_printf("rewritten sender = %s\n", sender_address);
2988 /* The headers must be run through rewrite_header(), because it ensures that
2989 addresses are fully qualified, as well as applying any rewriting rules that may
2992 Qualification of header addresses in a message from a remote host happens only
2993 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2994 appropriate. For local messages, qualification always happens, unless -bnq is
2995 used to explicitly suppress it. No rewriting is done for an unqualified address
2996 that is left untouched.
2998 We start at the second header, skipping our own Received:. This rewriting is
2999 documented as happening *after* recipient addresses are taken from the headers
3000 by the -t command line option. An added Sender: gets rewritten here. */
3002 for (header_line * h = header_list->next; h; h = h->next)
3004 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3005 rewrite_existflags, TRUE);
3010 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3011 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3012 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3013 exists, this applies to the set of resent- headers rather than the normal set.
3015 The requirement for a recipient header has been removed in RFC 2822. At this
3016 point in the code, earlier versions of Exim added a To: header for locally
3017 submitted messages, and an empty Bcc: header for others. In the light of the
3018 changes in RFC 2822, this was dropped in November 2003. */
3021 /* If there is no date header, generate one if the message originates locally
3022 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3023 submission mode flag is set. Messages without Date: are not valid, but it seems
3024 to be more confusing if Exim adds one to all remotely-originated messages.
3025 As per Message-Id, we prepend if resending, else append.
3028 if ( !date_header_exists
3029 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3030 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3031 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3033 search_tidyup(); /* Free any cached resources */
3035 /* Show the complete set of headers if debugging. Note that the first one (the
3036 new Received:) has not yet been set. */
3040 debug_printf(">>Headers after rewriting and local additions:\n");
3041 for (header_line * h = header_list->next; h; h = h->next)
3042 debug_printf("%c %s", h->type, h->text);
3046 /* The headers are now complete in store. If we are running in filter
3047 testing mode, that is all this function does. Return TRUE if the message
3048 ended with a dot. */
3050 if (filter_test != FTEST_NONE)
3052 process_info[process_info_len] = 0;
3053 return message_ended == END_DOT;
3056 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3057 think more if it could be handled. Cannot do onward CHUNKING unless
3058 inbound is, but inbound chunking ought to be ok with outbound plain.
3059 Could we do onward CHUNKING given inbound CHUNKING?
3061 if (chunking_state > CHUNKING_OFFERED)
3062 cancel_cutthrough_connection(FALSE, US"chunking active");
3064 /* Cutthrough delivery:
3065 We have to create the Received header now rather than at the end of reception,
3066 so the timestamp behaviour is a change to the normal case.
3067 Having created it, send the headers to the destination. */
3069 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3071 if (received_count > received_headers_max)
3073 cancel_cutthrough_connection(TRUE, US"too many headers");
3074 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3075 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3076 "Too many \"Received\" headers",
3078 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3079 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3080 message_id[0] = 0; /* Indicate no message accepted */
3081 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3082 goto TIDYUP; /* Skip to end of function */
3084 received_header_gen();
3085 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3086 (void) cutthrough_headers_send();
3090 /* Open a new spool file for the data portion of the message. We need
3091 to access it both via a file descriptor and a stream. Try to make the
3092 directory if it isn't there. */
3094 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3095 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3097 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3099 if (errno == ENOENT)
3101 (void) directory_make(spool_directory,
3102 spool_sname(US"input", message_subdir),
3103 INPUT_DIRECTORY_MODE, TRUE);
3104 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3107 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3108 spool_name, strerror(errno));
3111 /* Make sure the file's group is the Exim gid, and double-check the mode
3112 because the group setting doesn't always get set automatically. */
3114 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3115 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3116 "Failed setting ownership on spool file %s: %s",
3117 spool_name, strerror(errno));
3118 (void)fchmod(data_fd, SPOOL_MODE);
3120 /* We now have data file open. Build a stream for it and lock it. We lock only
3121 the first line of the file (containing the message ID) because otherwise there
3122 are problems when Exim is run under Cygwin (I'm told). See comments in
3123 spool_in.c, where the same locking is done. */
3125 spool_data_file = fdopen(data_fd, "w+");
3126 lock_data.l_type = F_WRLCK;
3127 lock_data.l_whence = SEEK_SET;
3128 lock_data.l_start = 0;
3129 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3131 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3132 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3133 errno, strerror(errno));
3135 /* We have an open, locked data file. Write the message id to it to make it
3136 self-identifying. Then read the remainder of the input of this message and
3137 write it to the data file. If the variable next != NULL, it contains the first
3138 data line (which was read as a header but then turned out not to have the right
3139 format); write it (remembering that it might contain binary zeros). The result
3140 of fwrite() isn't inspected; instead we call ferror() below. */
3142 fprintf(spool_data_file, "%s-D\n", message_id);
3145 uschar *s = next->text;
3146 int len = next->slen;
3147 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3148 body_linecount++; /* Assumes only 1 line */
3151 /* Note that we might already be at end of file, or the logical end of file
3152 (indicated by '.'), or might have encountered an error while writing the
3153 message id or "next" line. */
3155 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3159 message_ended = chunking_state <= CHUNKING_OFFERED
3160 ? read_message_data_smtp(spool_data_file)
3162 ? read_message_bdat_smtp_wire(spool_data_file)
3163 : read_message_bdat_smtp(spool_data_file);
3164 receive_linecount++; /* The terminating "." line */
3167 message_ended = read_message_data(spool_data_file);
3169 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3170 message_linecount += body_linecount;
3172 switch (message_ended)
3174 /* Handle premature termination of SMTP */
3179 Uunlink(spool_name); /* Lose data file when closed */
3180 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3181 message_id[0] = 0; /* Indicate no message accepted */
3182 smtp_reply = handle_lost_connection(US"");
3184 goto TIDYUP; /* Skip to end of function */
3188 /* Handle message that is too big. Don't use host_or_ident() in the log
3189 message; we want to see the ident value even for non-remote messages. */
3192 Uunlink(spool_name); /* Lose the data file when closed */
3193 cancel_cutthrough_connection(TRUE, US"mail too big");
3194 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3196 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3197 "message too big: read=%d max=%d",
3199 sender_fullhost ? " H=" : "",
3200 sender_fullhost ? sender_fullhost : US"",
3201 sender_ident ? " U=" : "",
3202 sender_ident ? sender_ident : US"",
3204 thismessage_size_limit);
3208 smtp_reply = US"552 Message size exceeds maximum permitted";
3209 message_id[0] = 0; /* Indicate no message accepted */
3210 goto TIDYUP; /* Skip to end of function */
3214 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3215 give_local_error(ERRMESS_TOOBIG,
3216 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3217 US"message rejected: ", error_rc, spool_data_file, header_list);
3218 /* Does not return */
3222 /* Handle bad BDAT protocol sequence */
3225 Uunlink(spool_name); /* Lose the data file when closed */
3226 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3227 smtp_reply = US""; /* Response already sent */
3228 message_id[0] = 0; /* Indicate no message accepted */
3229 goto TIDYUP; /* Skip to end of function */
3233 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3234 example, there may be some expansion in an ACL that uses a timer.) */
3236 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3238 /* The message body has now been read into the data file. Call fflush() to
3239 empty the buffers in C, and then call fsync() to get the data written out onto
3240 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3241 having to do this). If there was an I/O error on either input or output,
3242 attempt to send an error message, and unlink the spool file. For non-SMTP input
3243 we can then give up. Note that for SMTP input we must swallow the remainder of
3244 the input in cases of output errors, since the far end doesn't expect to see
3245 anything until the terminating dot line is sent. */
3247 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3248 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3250 uschar *msg_errno = US strerror(errno);
3251 BOOL input_error = (receive_ferror)() != 0;
3252 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3253 input_error? "Input read" : "Spool write",
3255 sender_fullhost ? sender_fullhost : sender_ident);
3257 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3258 Uunlink(spool_name); /* Lose the data file */
3259 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3264 smtp_reply = US"451 Error while reading input data";
3267 smtp_reply = US"451 Error while writing spool file";
3268 receive_swallow_smtp();
3270 message_id[0] = 0; /* Indicate no message accepted */
3271 goto TIDYUP; /* Skip to end of function */
3276 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3277 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3279 /* Does not return */
3284 /* No I/O errors were encountered while writing the data file. */
3286 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3287 gettimeofday(&received_time_complete, NULL);
3290 /* If there were any bad addresses extracted by -t, or there were no recipients
3291 left after -t, send a message to the sender of this message, or write it to
3292 stderr if the error handling option is set that way. Note that there may
3293 legitimately be no recipients for an SMTP message if they have all been removed
3296 We need to rewind the data file in order to read it. In the case of no
3297 recipients or stderr error writing, throw the data file away afterwards, and
3298 exit. (This can't be SMTP, which always ensures there's at least one
3299 syntactically good recipient address.) */
3301 if (extract_recip && (bad_addresses || recipients_count == 0))
3305 if (recipients_count == 0) debug_printf("*** No recipients\n");
3308 debug_printf("*** Bad address(es)\n");
3309 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3310 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3314 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3315 message_id, bad_addresses ? "bad addresses" : "no recipients");
3317 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3319 /* If configured to send errors to the sender, but this fails, force
3320 a failure error code. We use a special one for no recipients so that it
3321 can be detected by the autoreply transport. Otherwise error_rc is set to
3322 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3323 it is EXIT_SUCCESS. */
3325 if (error_handling == ERRORS_SENDER)
3327 if (!moan_to_sender(
3329 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3330 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3331 bad_addresses, header_list, spool_data_file, FALSE
3333 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3338 if (extracted_ignored)
3339 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3341 fprintf(stderr, "exim: no recipients in message\n");
3344 fprintf(stderr, "exim: invalid address%s",
3345 bad_addresses->next ? "es:\n" : ":");
3346 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3347 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3348 bad_addresses->text2);
3352 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3354 Uunlink(spool_name);
3355 (void)fclose(spool_data_file);
3356 exim_exit(error_rc);
3360 /* Data file successfully written. Generate text for the Received: header by
3361 expanding the configured string, and adding a timestamp. By leaving this
3362 operation till now, we ensure that the timestamp is the time that message
3363 reception was completed. However, this is deliberately done before calling the
3364 data ACL and local_scan().
3366 This Received: header may therefore be inspected by the data ACL and by code in
3367 the local_scan() function. When they have run, we update the timestamp to be
3368 the final time of reception.
3370 If there is just one recipient, set up its value in the $received_for variable
3371 for use when we generate the Received: header.
3373 Note: the checking for too many Received: headers is handled by the delivery
3375 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3377 if (!received_header->text) /* Non-cutthrough case */
3379 received_header_gen();
3381 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3383 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3384 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3386 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3387 now, before running the DATA ACL. */
3389 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3392 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3393 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3395 /* If an ACL is specified for checking things at this stage of reception of a
3396 message, run it, unless all the recipients were removed by "discard" in earlier
3397 ACLs. That is the only case in which recipients_count can be zero at this
3398 stage. Set deliver_datafile to point to the data file so that $message_body and
3399 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3402 deliver_datafile = data_fd;
3405 f.enable_dollar_recipients = TRUE;
3407 if (recipients_count == 0)
3408 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3412 /* Handle interactive SMTP messages */
3414 if (smtp_input && !smtp_batched_input)
3417 #ifndef DISABLE_DKIM
3418 if (!f.dkim_disable_verify)
3420 /* Finish verification */
3421 dkim_exim_verify_finish();
3423 /* Check if we must run the DKIM ACL */
3424 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3426 uschar * dkim_verify_signers_expanded =
3427 expand_string(dkim_verify_signers);
3428 gstring * results = NULL;
3432 gstring * seen_items = NULL;
3433 int old_pool = store_pool;
3435 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3437 if (!(ptr = dkim_verify_signers_expanded))
3438 log_write(0, LOG_MAIN|LOG_PANIC,
3439 "expansion of dkim_verify_signers option failed: %s",
3440 expand_string_message);
3442 /* Default to OK when no items are present */
3444 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3446 /* Prevent running ACL for an empty item */
3447 if (!item || !*item) continue;
3449 /* Only run ACL once for each domain or identity,
3450 no matter how often it appears in the expanded list. */
3454 const uschar * seen_items_list = string_from_gstring(seen_items);
3456 BOOL seen_this_item = FALSE;
3458 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3460 if (Ustrcmp(seen_item,item) == 0)
3462 seen_this_item = TRUE;
3469 debug_printf("acl_smtp_dkim: skipping signer %s, "
3470 "already seen\n", item);
3474 seen_items = string_catn(seen_items, US":", 1);
3476 seen_items = string_cat(seen_items, item);
3478 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3482 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3483 "skipping remaining items\n", rc, item);
3484 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3488 dkim_verify_status = string_from_gstring(results);
3489 store_pool = old_pool;
3490 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3493 recipients_count = 0;
3494 blackholed_by = US"DKIM ACL";
3496 blackhole_log_msg = string_sprintf(": %s", log_msg);
3500 Uunlink(spool_name);
3501 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3502 smtp_yield = FALSE; /* No more messages after dropped connection */
3503 smtp_reply = US""; /* Indicate reply already sent */
3504 message_id[0] = 0; /* Indicate no message accepted */
3505 goto TIDYUP; /* Skip to end of function */
3509 dkim_exim_verify_log_all();
3511 #endif /* DISABLE_DKIM */
3513 #ifdef WITH_CONTENT_SCAN
3514 if ( recipients_count > 0
3516 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3519 #endif /* WITH_CONTENT_SCAN */
3521 #ifdef SUPPORT_DMARC
3522 dmarc_store_data(from_header);
3525 #ifndef DISABLE_PRDR
3526 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3529 int all_fail = FAIL;
3531 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3532 /* Loop through recipients, responses must be in same order received */
3533 for (unsigned int c = 0; recipients_count > c; c++)
3535 uschar * addr= recipients_list[c].address;
3536 uschar * msg= US"PRDR R=<%s> %s";
3539 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3540 addr, c+1, recipients_count);
3541 rc = acl_check(ACL_WHERE_PRDR, addr,
3542 acl_smtp_data_prdr, &user_msg, &log_msg);
3544 /* If any recipient rejected content, indicate it in final message */
3546 /* If all recipients rejected, indicate in final message */
3551 case OK: case DISCARD: code = US"250"; break;
3552 case DEFER: code = US"450"; break;
3553 default: code = US"550"; break;
3555 if (user_msg != NULL)
3556 smtp_user_msg(code, user_msg);
3561 case OK: case DISCARD:
3562 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3564 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3566 msg = string_sprintf(CS msg, addr, "refusal"); break;
3568 smtp_user_msg(code, msg);
3570 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3571 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3572 else log_write(0, LOG_MAIN, "%s", CS msg);
3574 if (rc != OK) { receive_remove_recipient(addr); c--; }
3576 /* Set up final message, used if data acl gives OK */
3577 smtp_reply = string_sprintf("%s id=%s message %s",
3578 all_fail == FAIL ? US"550" : US"250",
3581 ? US"rejected for all recipients"
3584 : US"accepted for some recipients");
3585 if (recipients_count == 0)
3587 message_id[0] = 0; /* Indicate no message accepted */
3592 prdr_requested = FALSE;
3593 #endif /* !DISABLE_PRDR */
3595 /* Check the recipients count again, as the MIME ACL might have changed
3598 if (acl_smtp_data != NULL && recipients_count > 0)
3600 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3601 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3604 recipients_count = 0;
3605 blackholed_by = US"DATA ACL";
3607 blackhole_log_msg = string_sprintf(": %s", log_msg);
3608 cancel_cutthrough_connection(TRUE, US"data acl discard");
3612 Uunlink(spool_name);
3613 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3614 #ifdef WITH_CONTENT_SCAN
3617 #ifdef EXPERIMENTAL_DCC
3620 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3621 smtp_yield = FALSE; /* No more messages after dropped connection */
3622 smtp_reply = US""; /* Indicate reply already sent */
3623 message_id[0] = 0; /* Indicate no message accepted */
3624 goto TIDYUP; /* Skip to end of function */
3629 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3630 we cannot take different actions for permanent and temporary rejections. */
3635 #ifdef WITH_CONTENT_SCAN
3636 if ( acl_not_smtp_mime
3637 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3641 #endif /* WITH_CONTENT_SCAN */
3645 uschar *user_msg, *log_msg;
3646 f.authentication_local = TRUE;
3647 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3650 recipients_count = 0;
3651 blackholed_by = US"non-SMTP ACL";
3653 blackhole_log_msg = string_sprintf(": %s", log_msg);
3657 Uunlink(spool_name);
3658 #ifdef WITH_CONTENT_SCAN
3661 #ifdef EXPERIMENTAL_DCC
3664 /* The ACL can specify where rejections are to be logged, possibly
3665 nowhere. The default is main and reject logs. */
3667 if (log_reject_target)
3668 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3669 sender_address, log_msg);
3671 if (!user_msg) user_msg = US"local configuration problem";
3672 if (smtp_batched_input)
3673 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3674 /* Does not return */
3677 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3678 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3679 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3681 /* Does not return */
3684 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3688 /* The applicable ACLs have been run */
3690 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3691 if (f.queue_only_policy) queued_by = US"ACL";
3694 #ifdef WITH_CONTENT_SCAN
3698 #ifdef EXPERIMENTAL_DCC
3703 #ifdef HAVE_LOCAL_SCAN
3704 /* The final check on the message is to run the scan_local() function. The
3705 version supplied with Exim always accepts, but this is a hook for sysadmins to
3706 supply their own checking code. The local_scan() function is run even when all
3707 the recipients have been discarded. */
3709 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3711 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3712 deleted, and the incident gets logged. */
3714 if (sigsetjmp(local_scan_env, 1) == 0)
3716 had_local_scan_crash = 0;
3717 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3718 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3719 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3720 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3722 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3723 local_scan_timeout);
3724 local_scan_data = NULL;
3726 had_local_scan_timeout = 0;
3727 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3728 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3729 rc = local_scan(data_fd, &local_scan_data);
3731 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3733 f.enable_dollar_recipients = FALSE;
3735 store_pool = POOL_MAIN; /* In case changed */
3736 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3739 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3740 os_non_restarting_signal(SIGFPE, SIG_DFL);
3741 os_non_restarting_signal(SIGILL, SIG_DFL);
3742 os_non_restarting_signal(SIGBUS, SIG_DFL);
3746 if (had_local_scan_crash)
3748 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3749 "signal %d - message temporarily rejected (size %d)",
3750 had_local_scan_crash, message_size);
3751 receive_bomb_out(US"local-scan-error", US"local verification problem");
3752 /* Does not return */
3754 if (had_local_scan_timeout)
3756 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3757 "message temporarily rejected (size %d)", message_size);
3758 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3759 /* Does not return */
3763 /* The length check is paranoia against some runaway code, and also because
3764 (for a success return) lines in the spool file are read into big_buffer. */
3766 if (local_scan_data)
3768 int len = Ustrlen(local_scan_data);
3769 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3770 local_scan_data = string_copyn(local_scan_data, len);
3773 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3775 if (!f.deliver_freeze) /* ACL might have already frozen */
3777 f.deliver_freeze = TRUE;
3778 deliver_frozen_at = time(NULL);
3779 frozen_by = US"local_scan()";
3781 rc = LOCAL_SCAN_ACCEPT;
3783 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3785 if (!f.queue_only_policy) /* ACL might have already queued */
3787 f.queue_only_policy = TRUE;
3788 queued_by = US"local_scan()";
3790 rc = LOCAL_SCAN_ACCEPT;
3793 /* Message accepted: remove newlines in local_scan_data because otherwise
3794 the spool file gets corrupted. Ensure that all recipients are qualified. */
3796 if (rc == LOCAL_SCAN_ACCEPT)
3798 if (local_scan_data)
3799 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3800 for (int i = 0; i < recipients_count; i++)
3802 recipient_item *r = recipients_list + i;
3803 r->address = rewrite_address_qualify(r->address, TRUE);
3805 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3807 if (recipients_count == 0 && !blackholed_by)
3808 blackholed_by = US"local_scan";
3811 /* Message rejected: newlines permitted in local_scan_data to generate
3812 multiline SMTP responses. */
3816 uschar *istemp = US"";
3820 errmsg = local_scan_data;
3822 Uunlink(spool_name); /* Cancel this message */
3826 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3827 "rejection given", rc);
3830 case LOCAL_SCAN_REJECT_NOLOGHDR:
3831 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3834 case LOCAL_SCAN_REJECT:
3835 smtp_code = US"550";
3836 if (!errmsg) errmsg = US"Administrative prohibition";
3839 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3840 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3843 case LOCAL_SCAN_TEMPREJECT:
3845 smtp_code = US"451";
3846 if (!errmsg) errmsg = US"Temporary local problem";
3847 istemp = US"temporarily ";
3851 g = string_append(NULL, 2, US"F=",
3852 sender_address[0] == 0 ? US"<>" : sender_address);
3853 g = add_host_info_for_log(g);
3855 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3856 string_from_gstring(g), istemp, string_printing(errmsg));
3859 if (!smtp_batched_input)
3861 smtp_respond(smtp_code, 3, TRUE, errmsg);
3862 message_id[0] = 0; /* Indicate no message accepted */
3863 smtp_reply = US""; /* Indicate reply already sent */
3864 goto TIDYUP; /* Skip to end of function */
3867 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3868 /* Does not return */
3871 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3872 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3873 US"message rejected by local scan code: ", error_rc, spool_data_file,
3875 /* Does not return */
3879 /* Reset signal handlers to ignore signals that previously would have caused
3880 the message to be abandoned. */
3882 signal(SIGTERM, SIG_IGN);
3883 signal(SIGINT, SIG_IGN);
3884 #endif /* HAVE_LOCAL_SCAN */
3887 /* Ensure the first time flag is set in the newly-received message. */
3889 f.deliver_firsttime = TRUE;
3891 #ifdef EXPERIMENTAL_BRIGHTMAIL
3893 { /* rewind data file */
3894 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3895 bmi_verdicts = bmi_process_message(header_list, data_fd);
3899 /* Update the timestamp in our Received: header to account for any time taken by
3900 an ACL or by local_scan(). The new time is the time that all reception
3901 processing is complete. */
3903 timestamp = expand_string(US"${tod_full}");
3904 tslen = Ustrlen(timestamp);
3906 memcpy(received_header->text + received_header->slen - tslen - 1,
3909 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3913 f.deliver_freeze = FALSE;
3914 f.queue_only_policy = FALSE;
3917 /* Keep the data file open until we have written the header file, in order to
3918 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3919 don't write the header file, and we unlink the data file. If writing the header
3920 file fails, we have failed to accept this message. */
3922 if (host_checking || blackholed_by)
3924 Uunlink(spool_name);
3925 msg_size = 0; /* Compute size for log line */
3926 for (header_line * h = header_list; h; h = h->next)
3927 if (h->type != '*') msg_size += h->slen;
3930 /* Write the -H file */
3933 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3935 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3936 Uunlink(spool_name); /* Lose the data file */
3940 smtp_reply = US"451 Error in writing spool file";
3941 message_id[0] = 0; /* Indicate no message accepted */
3946 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3947 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3949 /* Does not return */
3954 /* The message has now been successfully received. */
3956 receive_messagecount++;
3958 /* Add data size to written header size. We do not count the initial file name
3959 that is in the file, but we do add one extra for the notional blank line that
3960 precedes the data. This total differs from message_size in that it include the
3961 added Received: header and any other headers that got created locally. */
3963 if (fflush(spool_data_file))
3965 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3966 log_write(0, LOG_MAIN, "%s\n", errmsg);
3967 Uunlink(spool_name); /* Lose the data file */
3971 smtp_reply = US"451 Error in writing spool file";
3972 message_id[0] = 0; /* Indicate no message accepted */
3977 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3978 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3980 /* Does not return */
3983 fstat(data_fd, &statbuf);
3985 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3987 /* Generate a "message received" log entry. We do this by building up a dynamic
3988 string as required. We log the arrival of a new message while the
3989 file is still locked, just in case the machine is *really* fast, and delivers
3990 it first! Include any message id that is in the message - since the syntax of a
3991 message id is actually an addr-spec, we can use the parse routine to canonicalize
3994 rcvd_log_reset_point = store_mark();
3995 g = string_get(256);
3997 g = string_append(g, 2,
3998 fake_response == FAIL ? US"(= " : US"<= ",
3999 sender_address[0] == 0 ? US"<>" : sender_address);
4000 if (message_reference)
4001 g = string_append(g, 2, US" R=", message_reference);
4003 g = add_host_info_for_log(g);
4006 if (LOGGING(tls_cipher) && tls_in.cipher)
4008 g = string_append(g, 2, US" X=", tls_in.cipher);
4009 # ifndef DISABLE_TLS_RESUME
4010 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4011 g = string_catn(g, US"*", 1);
4014 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4015 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4016 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4017 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4018 if (LOGGING(tls_sni) && tls_in.sni)
4019 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4022 if (sender_host_authenticated)
4024 g = string_append(g, 2, US" A=", sender_host_authenticated);
4025 if (authenticated_id)
4027 g = string_append(g, 2, US":", authenticated_id);
4028 if (LOGGING(smtp_mailauth) && authenticated_sender)
4029 g = string_append(g, 2, US":", authenticated_sender);
4033 #ifndef DISABLE_PRDR
4035 g = string_catn(g, US" PRDR", 5);
4038 #ifdef SUPPORT_PROXY
4039 if (proxy_session && LOGGING(proxy))
4040 g = string_append(g, 2, US" PRX=", proxy_local_address);
4043 if (chunking_state > CHUNKING_OFFERED)
4044 g = string_catn(g, US" K", 2);
4046 g = string_fmt_append(g, " S=%d", msg_size);
4048 /* log 8BITMIME mode announced in MAIL_FROM
4052 if (LOGGING(8bitmime))
4053 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4055 #ifndef DISABLE_DKIM
4056 if (LOGGING(dkim) && dkim_verify_overall)
4057 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4058 # ifdef EXPERIMENTAL_ARC
4059 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4060 g = string_catn(g, US" ARC", 4);
4064 if (LOGGING(receive_time))
4066 struct timeval diff = received_time_complete;
4067 timediff(&diff, &received_time);
4068 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4072 g = string_append(g, 2, US" Q=", queue_name);
4074 /* If an addr-spec in a message-id contains a quoted string, it can contain
4075 any characters except " \ and CR and so in particular it can contain NL!
4076 Therefore, make sure we use a printing-characters only version for the log.
4077 Also, allow for domain literals in the message id. */
4079 if ( LOGGING(msg_id) && msgid_header
4080 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4084 BOOL save_allow_domain_literals = allow_domain_literals;
4085 allow_domain_literals = TRUE;
4086 int start, end, domain;
4088 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4089 &errmsg, &start, &end, &domain, FALSE);
4090 allow_domain_literals = save_allow_domain_literals;
4092 g = string_append(g, 2,
4093 msgid_header_newly_created ? US" id*=" : US" id=",
4094 string_printing(old_id));
4097 /* If subject logging is turned on, create suitable printing-character
4098 text. By expanding $h_subject: we make use of the MIME decoding. */
4100 if (LOGGING(subject) && subject_header)
4102 uschar *p = big_buffer;
4103 uschar *ss = expand_string(US"$h_subject:");
4105 /* Backslash-quote any double quotes or backslashes so as to make a
4106 a C-like string, and turn any non-printers into escape sequences. */
4109 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4111 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4116 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4119 /* Terminate the string: string_cat() and string_append() leave room, but do
4120 not put the zero in. */
4122 (void) string_from_gstring(g);
4124 /* Create a message log file if message logs are being used and this message is
4125 not blackholed. Write the reception stuff to it. We used to leave message log
4126 creation until the first delivery, but this has proved confusing for some
4129 if (message_logs && !blackholed_by)
4132 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4134 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4138 (void)directory_make(spool_directory,
4139 spool_sname(US"msglog", message_subdir),
4140 MSGLOG_DIRECTORY_MODE, TRUE);
4141 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4145 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4146 m_name, strerror(errno));
4149 FILE *message_log = fdopen(fd, "a");
4152 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4153 m_name, strerror(errno));
4158 uschar *now = tod_stamp(tod_log);
4159 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4160 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4162 if (f.queue_only_policy) fprintf(message_log,
4163 "%s no immediate delivery: queued%s%s by %s\n", now,
4164 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4166 (void)fclose(message_log);
4171 /* Everything has now been done for a successful message except logging its
4172 arrival, and outputting an SMTP response. While writing to the log, set a flag
4173 to cause a call to receive_bomb_out() if the log cannot be opened. */
4175 f.receive_call_bombout = TRUE;
4177 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4178 connection has gone away. This can only be done if there is no unconsumed input
4179 waiting in the local input buffer. We can test for this by calling
4180 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4181 input to be sent following the final dot, so the presence of following input is
4184 If the connection is still present, but there is no unread input for the
4185 socket, the result of a select() call will be zero. If, however, the connection
4186 has gone away, or if there is pending input, the result of select() will be
4187 non-zero. The two cases can be distinguished by trying to read the next input
4188 character. If we succeed, we can unread it so that it remains in the local
4189 buffer for handling later. If not, the connection has been lost.
4191 Of course, since TCP/IP is asynchronous, there is always a chance that the
4192 connection will vanish between the time of this test and the sending of the
4193 response, but the chance of this happening should be small. */
4195 if (smtp_input && sender_host_address && !f.sender_host_notsocket &&
4196 !receive_smtp_buffered())
4198 struct timeval tv = {.tv_sec = 0, .tv_usec = 0};
4199 fd_set select_check;
4200 FD_ZERO(&select_check);
4201 FD_SET(fileno(smtp_in), &select_check);
4203 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4205 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4206 if (c != EOF) (receive_ungetc)(c); else
4208 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4209 smtp_reply = US""; /* No attempt to send a response */
4210 smtp_yield = FALSE; /* Nothing more on this connection */
4212 /* Re-use the log line workspace */
4215 g = string_cat(g, US"SMTP connection lost after final dot");
4216 g = add_host_info_for_log(g);
4217 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4219 /* Delete the files for this aborted message. */
4221 Uunlink(spool_name);
4222 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4223 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4230 /* The connection has not gone away; we really are going to take responsibility
4231 for this message. */
4233 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4236 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4237 the sender's dot (below).
4238 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4239 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4240 in which case pass temp-reject back to initiator and dump the files.
4242 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4244 XXX We do not handle queue-only, freezing, or blackholes.
4246 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4248 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4249 /* Logging was done in finaldot() */
4252 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4253 cutthrough_done = ACCEPTED;
4254 break; /* message_id needed for SMTP accept below */
4256 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4257 ... for which, pass back the exact error */
4258 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4259 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4260 break; /* message_id needed for SMTP accept below */
4262 default: /* Unknown response, or error. Treat as temp-reject. */
4263 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4264 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4265 break; /* message_id needed for SMTP accept below */
4267 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4268 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4269 cutthrough_done = PERM_REJ;
4274 #ifndef DISABLE_PRDR
4275 if(!smtp_reply || prdr_requested)
4280 log_write(0, LOG_MAIN |
4281 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4282 (LOGGING(received_sender) ? LOG_SENDER : 0),
4285 /* Log any control actions taken by an ACL or local_scan(). */
4287 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4288 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4289 "no immediate delivery: queued%s%s by %s",
4290 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4293 f.receive_call_bombout = FALSE;
4295 /* The store for the main log message can be reused */
4296 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4298 /* If the message is frozen, and freeze_tell is set, do the telling. */
4300 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4301 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4302 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4303 message_id, frozen_by, sender_address);
4306 /* Either a message has been successfully received and written to the two spool
4307 files, or an error in writing the spool has occurred for an SMTP message, or
4308 an SMTP message has been rejected for policy reasons, or a message was passed on
4309 by cutthrough delivery. (For a non-SMTP message we will have already given up
4310 because there's no point in carrying on!) For non-cutthrough we must now close
4311 (and thereby unlock) the data file. In the successful case, this leaves the
4312 message on the spool, ready for delivery. In the error case, the spool file will
4313 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4316 For cutthrough we hold the data file locked until we have deleted it, otherwise
4317 a queue-runner could grab it in the window.
4319 A fflush() was done earlier in the expectation that any write errors on the
4320 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4321 possible for fclose() to fail - but what to do? What has happened to the lock
4322 if this happens? We can at least log it; if it is observed on some platform
4323 then we can think about properly declaring the message not-received. */
4327 /* In SMTP sessions we may receive several messages in one connection. After
4328 each one, we wait for the clock to tick at the level of message-id granularity.
4329 This is so that the combination of time+pid is unique, even on systems where the
4330 pid can be re-used within our time interval. We can't shorten the interval
4331 without re-designing the message-id. See comments above where the message id is
4332 created. This is Something For The Future.
4333 Do this wait any time we have created a message-id, even if we rejected the
4334 message. This gives unique IDs for logging done by ACLs.
4335 The initial timestamp must have been obtained via exim_gettime() to avoid
4336 issues on Linux with suspend/resume.
4337 It would be Nicer to only pause before a follow-on message. */
4339 if (id_resolution != 0)
4341 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
4342 exim_wait_tick(&message_id_tv, id_resolution);
4347 process_info[process_info_len] = 0; /* Remove message id */
4348 if (spool_data_file && cutthrough_done == NOT_TRIED)
4350 if (fclose(spool_data_file)) /* Frees the lock */
4351 log_write(0, LOG_MAIN|LOG_PANIC,
4352 "spoolfile error on close: %s", strerror(errno));
4353 spool_data_file = NULL;
4356 /* Now reset signal handlers to their defaults */
4358 signal(SIGTERM, SIG_DFL);
4359 signal(SIGINT, SIG_DFL);
4361 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4362 value, which defaults TRUE - meaning there may be more incoming messages from
4363 this connection. For non-SMTP callers (where there is only ever one message),
4364 the default is FALSE. */
4370 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4371 is set to the response that should be sent. When it is NULL, we generate
4372 default responses. After an ACL error or local_scan() error, the response has
4373 already been sent, and smtp_reply is an empty string to indicate this. */
4375 if (!smtp_batched_input)
4379 if (fake_response != OK)
4380 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4381 3, TRUE, fake_response_text);
4383 /* An OK response is required; use "message" text if present. */
4387 uschar *code = US"250";
4389 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4390 smtp_respond(code, len, TRUE, user_msg);
4393 /* Default OK response */
4395 else if (chunking_state > CHUNKING_OFFERED)
4397 /* If there is more input waiting, no need to flush (probably the client
4398 pipelined QUIT after data). We check only the in-process buffer, not
4401 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4402 receive_smtp_buffered(),
4403 chunking_datasize, message_size+message_linecount, message_id);
4404 chunking_state = CHUNKING_OFFERED;
4407 smtp_printf("250 OK id=%s\r\n", receive_smtp_buffered(), message_id);
4411 "\n**** SMTP testing: that is not a real message id!\n\n");
4414 /* smtp_reply is set non-empty */
4416 else if (smtp_reply[0] != 0)
4417 if (fake_response != OK && smtp_reply[0] == '2')
4418 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4419 fake_response_text);
4421 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4423 switch (cutthrough_done)
4426 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4428 /* Delete spool files */
4429 Uunlink(spool_name);
4430 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4431 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4435 if (cutthrough.defer_pass)
4437 Uunlink(spool_name);
4438 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4439 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4444 if (cutthrough_done != NOT_TRIED)
4446 if (spool_data_file)
4448 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4449 spool_data_file = NULL;
4451 message_id[0] = 0; /* Prevent a delivery from starting */
4452 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4453 cutthrough.defer_pass = FALSE;
4457 /* For batched SMTP, generate an error message on failure, and do
4458 nothing on success. The function moan_smtp_batch() does not return -
4459 it exits from the program with a non-zero return code. */
4461 else if (smtp_reply)
4462 moan_smtp_batch(NULL, "%s", smtp_reply);
4466 /* If blackholing, we can immediately log this message's sad fate. The data
4467 file has already been unlinked, and the header file was never written to disk.
4468 We must now indicate that nothing was received, to prevent a delivery from
4473 const uschar *detail =
4474 #ifdef HAVE_LOCAL_SCAN
4475 local_scan_data ? string_printing(local_scan_data) :
4477 string_sprintf("(%s discarded recipients)", blackholed_by);
4478 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4479 log_write(0, LOG_MAIN, "Completed");
4483 /* Reset headers so that logging of rejects for a subsequent message doesn't
4484 include them. It is also important to set header_last = NULL before exiting
4485 from this function, as this prevents certain rewrites that might happen during
4486 subsequent verifying (of another incoming message) from trying to add headers
4487 when they shouldn't. */
4489 header_list = header_last = NULL;
4491 return yield; /* TRUE if more messages (SMTP only) */
4494 /* End of receive.c */