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 start, end, domain;
1667 int id_resolution = 0;
1669 int prevlines_length = 0;
1673 BOOL contains_resent_headers = FALSE;
1674 BOOL extracted_ignored = FALSE;
1675 BOOL first_line_ended_crlf = TRUE_UNSET;
1676 BOOL smtp_yield = TRUE;
1679 BOOL resents_exist = FALSE;
1680 uschar *resent_prefix = US"";
1681 uschar *blackholed_by = NULL;
1682 uschar *blackhole_log_msg = US"";
1683 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1686 error_block *bad_addresses = NULL;
1688 uschar *frozen_by = NULL;
1689 uschar *queued_by = NULL;
1692 rmark rcvd_log_reset_point;
1694 struct stat statbuf;
1696 /* Final message to give to SMTP caller, and messages from ACLs */
1698 uschar *smtp_reply = NULL;
1699 uschar *user_msg, *log_msg;
1701 /* Working header pointers */
1706 /* Flags for noting the existence of certain headers (only one left) */
1708 BOOL date_header_exists = FALSE;
1710 /* Pointers to receive the addresses of headers whose contents we need. */
1712 header_line *from_header = NULL;
1713 header_line *subject_header = NULL;
1714 header_line *msgid_header = NULL;
1715 header_line *received_header;
1716 BOOL msgid_header_newly_created = FALSE;
1718 /* Variables for use when building the Received: header. */
1724 /* Release any open files that might have been cached while preparing to
1725 accept the message - e.g. by verifying addresses - because reading a message
1726 might take a fair bit of real time. */
1730 /* Extracting the recipient list from an input file is incompatible with
1731 cutthrough delivery with the no-spool option. It shouldn't be possible
1732 to set up the combination, but just in case kill any ongoing connection. */
1733 if (extract_recip || !smtp_input)
1734 cancel_cutthrough_connection(TRUE, US"not smtp input");
1736 /* Initialize the chain of headers by setting up a place-holder for Received:
1737 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1738 pointing to the end of the chain to make adding headers simple. */
1740 received_header = header_list = header_last = store_get(sizeof(header_line), FALSE);
1741 header_list->next = NULL;
1742 header_list->type = htype_old;
1743 header_list->text = NULL;
1744 header_list->slen = 0;
1746 /* Control block for the next header to be read. */
1748 reset_point = store_mark();
1749 next = store_get(sizeof(header_line), FALSE); /* not tainted */
1750 next->text = store_get(header_size, TRUE); /* tainted */
1752 /* Initialize message id to be null (indicating no message read), and the
1753 header names list to be the normal list. Indicate there is no data file open
1754 yet, initialize the size and warning count, and deal with no size limit. */
1757 spool_data_file = NULL;
1762 received_count = 1; /* For the one we will add */
1764 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1766 /* While reading the message, the following counts are computed. */
1768 message_linecount = body_linecount = body_zerocount =
1769 max_received_linelength = 0;
1771 #ifdef WITH_CONTENT_SCAN
1772 /* reset non-per-part mime variables */
1773 mime_is_coverletter = 0;
1775 mime_part_count = -1;
1778 #ifndef DISABLE_DKIM
1779 /* Call into DKIM to set up the context. In CHUNKING mode
1780 we clear the dot-stuffing flag */
1781 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1782 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1785 #ifdef SUPPORT_DMARC
1786 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1789 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1790 ids, and fractions of a second are required. See the comments that precede the
1791 message id creation below.
1792 We use a routine that if possible uses a monotonic clock, and can be used again
1793 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1795 exim_gettime(&message_id_tv);
1797 /* For other uses of the received time we can operate with granularity of one
1798 second, and for that we use the global variable received_time. This is for
1799 things like ultimate message timeouts.
1800 For this we do not care about the Linux suspend/resume problem, so rather than
1801 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1803 gettimeofday(&received_time, NULL);
1805 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1806 happen in the smtp_getc() function when it refills its buffer. */
1808 had_data_timeout = 0;
1810 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1812 /* If not SMTP input, timeout happens only if configured, and we just set a
1813 single timeout for the whole message. */
1815 else if (receive_timeout > 0)
1817 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1818 ALARM(receive_timeout);
1821 /* SIGTERM and SIGINT are caught always. */
1823 had_data_sigint = 0;
1824 signal(SIGTERM, data_sigterm_sigint_handler);
1825 signal(SIGINT, data_sigterm_sigint_handler);
1827 /* Header lines in messages are not supposed to be very long, though when
1828 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1829 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1830 storing the header, and extend this as necessary using string_cat().
1832 To cope with total lunacies, impose an upper limit on the length of the header
1833 section of the message, as otherwise the store will fill up. We must also cope
1834 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1835 Folded header lines are joined into one string, leaving the '\n' characters
1836 inside them, so that writing them out reproduces the input.
1838 Loop for each character of each header; the next structure for chaining the
1839 header is set up already, with ptr the offset of the next character in
1844 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1846 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1847 SMTP must have a correct "." terminator. */
1849 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1851 smtp_reply = handle_lost_connection(US" (header)");
1853 goto TIDYUP; /* Skip to end of function */
1856 /* See if we are at the current header's size limit - there must be at least
1857 four bytes left. This allows for the new character plus a zero, plus two for
1858 extra insertions when we are playing games with dots and carriage returns. If
1859 we are at the limit, extend the text buffer. This could have been done
1860 automatically using string_cat() but because this is a tightish loop storing
1861 only one character at a time, we choose to do it inline. Normally
1862 store_extend() will be able to extend the block; only at the end of a big
1863 store block will a copy be needed. To handle the case of very long headers
1864 (and sometimes lunatic messages can have ones that are 100s of K long) we
1865 call store_release() for strings that have been copied - if the string is at
1866 the start of a block (and therefore the only thing in it, because we aren't
1867 doing any other gets), the block gets freed. We can only do this release if
1868 there were no allocations since the once that we want to free. */
1870 if (ptr >= header_size - 4)
1872 int oldsize = header_size;
1874 if (header_size >= INT_MAX/2)
1878 /* The data came from the message, so is tainted. */
1880 if (!store_extend(next->text, TRUE, oldsize, header_size))
1881 next->text = store_newblock(next->text, TRUE, header_size, ptr);
1884 /* Cope with receiving a binary zero. There is dispute about whether
1885 these should be allowed in RFC 822 messages. The middle view is that they
1886 should not be allowed in headers, at least. Exim takes this attitude at
1887 the moment. We can't just stomp on them here, because we don't know that
1888 this line is a header yet. Set a flag to cause scanning later. */
1890 if (ch == 0) had_zero++;
1892 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1893 those from data files use just LF. Treat LF in local SMTP input as a
1894 terminator too. Treat EOF as a line terminator always. */
1896 if (ch == EOF) goto EOL;
1898 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1899 other MTAs accept this. We are therefore forced into this "liberalisation"
1900 too, so we accept LF as a line terminator whatever the source of the message.
1901 However, if the first line of the message ended with a CRLF, we treat a bare
1902 LF specially by inserting a white space after it to ensure that the header
1903 line is not terminated. */
1907 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1908 else if (first_line_ended_crlf) receive_ungetc(' ');
1912 /* This is not the end of the line. If this is SMTP input and this is
1913 the first character in the line and it is a "." character, ignore it.
1914 This implements the dot-doubling rule, though header lines starting with
1915 dots aren't exactly common. They are legal in RFC 822, though. If the
1916 following is CRLF or LF, this is the line that that terminates the
1917 entire message. We set message_ended to indicate this has happened (to
1918 prevent further reading), and break out of the loop, having freed the
1919 empty header, and set next = NULL to indicate no data line. */
1921 if (ptr == 0 && ch == '.' && f.dot_ends)
1923 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1926 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1930 ch = '\r'; /* Revert to CR */
1935 message_ended = END_DOT;
1936 reset_point = store_reset(reset_point);
1938 break; /* End character-reading loop */
1941 /* For non-SMTP input, the dot at the start of the line was really a data
1942 character. What is now in ch is the following character. We guaranteed
1943 enough space for this above. */
1947 next->text[ptr++] = '.';
1952 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1953 remember this case if this is the first line ending. */
1957 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1960 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1964 /* Otherwise, put back the character after CR, and turn the bare CR
1967 ch = (receive_ungetc)(ch);
1968 next->text[ptr++] = '\n';
1973 /* We have a data character for the header line. */
1975 next->text[ptr++] = ch; /* Add to buffer */
1976 message_size++; /* Total message size so far */
1978 /* Handle failure due to a humungously long header section. The >= allows
1979 for the terminating \n. Add what we have so far onto the headers list so
1980 that it gets reflected in any error message, and back up the just-read
1983 if (message_size >= header_maxsize)
1986 next->text[ptr] = 0;
1988 next->type = htype_other;
1990 header_last->next = next;
1993 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1994 "%s (more than %d characters): message abandoned",
1995 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1999 smtp_reply = US"552 Message header is ridiculously long";
2000 receive_swallow_smtp();
2001 goto TIDYUP; /* Skip to end of function */
2006 give_local_error(ERRMESS_VLONGHEADER,
2007 string_sprintf("message header longer than %d characters received: "
2008 "message not accepted", header_maxsize), US"", error_rc, stdin,
2010 /* Does not return */
2014 continue; /* With next input character */
2016 /* End of header line reached */
2020 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2022 receive_linecount++;
2023 message_linecount++;
2025 /* Keep track of maximum line length */
2027 if (ptr - prevlines_length > max_received_linelength)
2028 max_received_linelength = ptr - prevlines_length;
2029 prevlines_length = ptr + 1;
2031 /* Now put in the terminating newline. There is always space for
2032 at least two more characters. */
2034 next->text[ptr++] = '\n';
2037 /* A blank line signals the end of the headers; release the unwanted
2038 space and set next to NULL to indicate this. */
2042 reset_point = store_reset(reset_point);
2047 /* There is data in the line; see if the next input character is a
2048 whitespace character. If it is, we have a continuation of this header line.
2049 There is always space for at least one character at this point. */
2053 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2054 if (nextch == ' ' || nextch == '\t')
2056 next->text[ptr++] = nextch;
2057 if (++message_size >= header_maxsize)
2059 continue; /* Iterate the loop */
2061 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2062 else ch = EOF; /* Cause main loop to exit at end */
2065 /* We have got to the real line end. Terminate the string and release store
2066 beyond it. If it turns out to be a real header, internal binary zeros will
2067 be squashed later. */
2069 next->text[ptr] = 0;
2071 store_release_above(next->text + ptr + 1);
2073 /* Check the running total size against the overall message size limit. We
2074 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2075 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2076 headers - the code to read the body will then also hit the buffer. */
2078 if (message_size > thismessage_size_limit) break;
2080 /* A line that is not syntactically correct for a header also marks
2081 the end of the headers. In this case, we leave next containing the
2082 first data line. This might actually be several lines because of the
2083 continuation logic applied above, but that doesn't matter.
2085 It turns out that smail, and presumably sendmail, accept leading lines
2088 From ph10 Fri Jan 5 12:35 GMT 1996
2090 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2091 find any documentation of this, but for compatibility it had better be
2092 accepted. Exim restricts it to the case of non-smtp messages, and
2093 treats it as an alternative to the -f command line option. Thus it is
2094 ignored except for trusted users or filter testing. Otherwise it is taken
2095 as the sender address, unless -f was used (sendmail compatibility).
2097 It further turns out that some UUCPs generate the From_line in a different
2100 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2102 The regex for matching these things is now capable of recognizing both
2103 formats (including 2- and 4-digit years in the latter). In fact, the regex
2104 is now configurable, as is the expansion string to fish out the sender.
2106 Even further on it has been discovered that some broken clients send
2107 these lines in SMTP messages. There is now an option to ignore them from
2108 specified hosts or networks. Sigh. */
2110 if ( header_last == header_list
2112 || ( sender_host_address
2113 && verify_check_host(&ignore_fromline_hosts) == OK
2115 || (!sender_host_address && ignore_fromline_local)
2117 && regex_match_and_setup(regex_From, next->text, 0, -1)
2120 if (!f.sender_address_forced)
2122 uschar *uucp_sender = expand_string(uucp_from_sender);
2124 log_write(0, LOG_MAIN|LOG_PANIC,
2125 "expansion of \"%s\" failed after matching "
2126 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2129 int start, end, domain;
2131 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2132 &start, &end, &domain, TRUE);
2135 if (domain == 0 && newsender[0] != 0)
2136 /* deconst ok as newsender was not const */
2137 newsender = US rewrite_address_qualify(newsender, FALSE);
2139 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2141 sender_address = newsender;
2143 if (f.trusted_caller || filter_test != FTEST_NONE)
2145 authenticated_sender = NULL;
2146 originator_name = US"";
2147 f.sender_local = FALSE;
2150 if (filter_test != FTEST_NONE)
2151 printf("Sender taken from \"From \" line\n");
2158 /* Not a leading "From " line. Check to see if it is a valid header line.
2159 Header names may contain any non-control characters except space and colon,
2164 uschar *p = next->text;
2166 /* If not a valid header line, break from the header reading loop, leaving
2167 next != NULL, indicating that it holds the first line of the body. */
2169 if (isspace(*p)) break;
2170 while (mac_isgraph(*p) && *p != ':') p++;
2171 while (isspace(*p)) p++;
2174 body_zerocount = had_zero;
2178 /* We have a valid header line. If there were any binary zeroes in
2179 the line, stomp on them here. */
2182 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2185 /* It is perfectly legal to have an empty continuation line
2186 at the end of a header, but it is confusing to humans
2187 looking at such messages, since it looks like a blank line.
2188 Reduce confusion by removing redundant white space at the
2189 end. We know that there is at least one printing character
2190 (the ':' tested for above) so there is no danger of running
2193 p = next->text + ptr - 2;
2196 while (*p == ' ' || *p == '\t') p--;
2197 if (*p != '\n') break;
2198 ptr = (p--) - next->text + 1;
2199 message_size -= next->slen - ptr;
2200 next->text[ptr] = 0;
2204 /* Add the header to the chain */
2206 next->type = htype_other;
2208 header_last->next = next;
2211 /* Check the limit for individual line lengths. This comes after adding to
2212 the chain so that the failing line is reflected if a bounce is generated
2213 (for a local message). */
2215 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2217 log_write(0, LOG_MAIN, "overlong message header line received from "
2218 "%s (more than %d characters): message abandoned",
2219 f.sender_host_unknown ? sender_ident : sender_fullhost,
2220 header_line_maxsize);
2224 smtp_reply = US"552 A message header line is too long";
2225 receive_swallow_smtp();
2226 goto TIDYUP; /* Skip to end of function */
2230 give_local_error(ERRMESS_VLONGHDRLINE,
2231 string_sprintf("message header line longer than %d characters "
2232 "received: message not accepted", header_line_maxsize), US"",
2233 error_rc, stdin, header_list->next);
2234 /* Does not return */
2237 /* Note if any resent- fields exist. */
2239 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2241 resents_exist = TRUE;
2242 resent_prefix = US"Resent-";
2246 /* Reject CHUNKING messages that do not CRLF their first header line */
2248 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2250 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2251 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2253 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2254 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2255 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2258 goto TIDYUP; /* Skip to end of function */
2261 /* The line has been handled. If we have hit EOF, break out of the loop,
2262 indicating no pending data line. */
2264 if (ch == EOF) { next = NULL; break; }
2266 /* Set up for the next header */
2268 reset_point = store_mark();
2270 next = store_get(sizeof(header_line), FALSE);
2271 next->text = store_get(header_size, TRUE);
2274 prevlines_length = 0;
2275 } /* Continue, starting to read the next header */
2277 /* At this point, we have read all the headers into a data structure in main
2278 store. The first header is still the dummy placeholder for the Received: header
2279 we are going to generate a bit later on. If next != NULL, it contains the first
2280 data line - which terminated the headers before reaching a blank line (not the
2285 debug_printf(">>Headers received:\n");
2286 for (header_line * h = header_list->next; h; h = h->next)
2287 debug_printf("%s", h->text);
2291 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2292 is dropped immediately after valid headers, the next thing we will see is EOF.
2293 We must test for this specially, as further down the reading of the data is
2294 skipped if already at EOF. */
2296 if (smtp_input && (receive_feof)())
2298 smtp_reply = handle_lost_connection(US" (after header)");
2300 goto TIDYUP; /* Skip to end of function */
2303 /* If this is a filter test run and no headers were read, output a warning
2304 in case there is a mistake in the test message. */
2306 if (filter_test != FTEST_NONE && header_list->next == NULL)
2307 printf("Warning: no message headers read\n");
2310 /* Scan the headers to identify them. Some are merely marked for later
2311 processing; some are dealt with here. */
2313 for (header_line * h = header_list->next; h; h = h->next)
2315 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2316 if (is_resent) contains_resent_headers = TRUE;
2318 switch (header_checkname(h, is_resent))
2321 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2325 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2328 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2331 if (!resents_exist || is_resent) date_header_exists = TRUE;
2334 /* Same comments as about Return-Path: below. */
2336 case htype_delivery_date:
2337 if (delivery_date_remove) h->type = htype_old;
2340 /* Same comments as about Return-Path: below. */
2342 case htype_envelope_to:
2343 if (envelope_to_remove) h->type = htype_old;
2346 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2347 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2348 header consists of just the login id of the user who called Exim, rewrite
2349 it with the gecos field first. Apply this rule to Resent-From: if there
2350 are resent- fields. */
2353 h->type = htype_from;
2354 if (!resents_exist || is_resent)
2360 uschar *s = Ustrchr(h->text, ':') + 1;
2361 while (isspace(*s)) s++;
2362 len = h->slen - (s - h->text) - 1;
2363 if (Ustrlen(originator_login) == len &&
2364 strncmpic(s, originator_login, len) == 0)
2366 uschar *name = is_resent? US"Resent-From" : US"From";
2367 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2368 originator_login, qualify_domain_sender);
2369 from_header = header_last;
2370 h->type = htype_old;
2371 DEBUG(D_receive|D_rewrite)
2372 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2378 /* Identify the Message-id: header for generating "in-reply-to" in the
2379 autoreply transport. For incoming logging, save any resent- value. In both
2380 cases, take just the first of any multiples. */
2383 if (!msgid_header && (!resents_exist || is_resent))
2390 /* Flag all Received: headers */
2392 case htype_received:
2393 h->type = htype_received;
2397 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2399 case htype_reply_to:
2400 h->type = htype_reply_to;
2403 /* The Return-path: header is supposed to be added to messages when
2404 they leave the SMTP system. We shouldn't receive messages that already
2405 contain Return-path. However, since Exim generates Return-path: on
2406 local delivery, resent messages may well contain it. We therefore
2407 provide an option (which defaults on) to remove any Return-path: headers
2408 on input. Removal actually means flagging as "old", which prevents the
2409 header being transmitted with the message. */
2411 case htype_return_path:
2412 if (return_path_remove) h->type = htype_old;
2414 /* If we are testing a mail filter file, use the value of the
2415 Return-Path: header to set up the return_path variable, which is not
2416 otherwise set. However, remove any <> that surround the address
2417 because the variable doesn't have these. */
2419 if (filter_test != FTEST_NONE)
2421 uschar *start = h->text + 12;
2422 uschar *end = start + Ustrlen(start);
2423 while (isspace(*start)) start++;
2424 while (end > start && isspace(end[-1])) end--;
2425 if (*start == '<' && end[-1] == '>')
2430 return_path = string_copyn(start, end - start);
2431 printf("Return-path taken from \"Return-path:\" header line\n");
2435 /* If there is a "Sender:" header and the message is locally originated,
2436 and from an untrusted caller and suppress_local_fixups is not set, or if we
2437 are in submission mode for a remote message, mark it "old" so that it will
2438 not be transmitted with the message, unless active_local_sender_retain is
2439 set. (This can only be true if active_local_from_check is false.) If there
2440 are any resent- headers in the message, apply this rule to Resent-Sender:
2441 instead of Sender:. Messages with multiple resent- header sets cannot be
2442 tidily handled. (For this reason, at least one MUA - Pine - turns old
2443 resent- headers into X-resent- headers when resending, leaving just one
2447 h->type = !f.active_local_sender_retain
2448 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2449 || f.submission_mode
2451 && (!resents_exist || is_resent)
2452 ? htype_old : htype_sender;
2455 /* Remember the Subject: header for logging. There is no Resent-Subject */
2461 /* "To:" gets flagged, and the existence of a recipient header is noted,
2462 whether it's resent- or not. */
2467 to_or_cc_header_exists = TRUE;
2473 /* Extract recipients from the headers if that is required (the -t option).
2474 Note that this is documented as being done *before* any address rewriting takes
2475 place. There are two possibilities:
2477 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2478 recipients already listed are to be REMOVED from the message. Smail 3 works
2479 like this. We need to build a non-recipients tree for that list, because in
2480 subsequent processing this data is held in a tree and that's what the
2481 spool_write_header() function expects. Make sure that non-recipient addresses
2482 are fully qualified and rewritten if necessary.
2484 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2485 those in the command line arguments (and it is rumoured some other MTAs do
2486 this). Therefore, there is an option to make Exim behave this way.
2488 *** Notes on "Resent-" header lines ***
2490 The presence of resent-headers in the message makes -t horribly ambiguous.
2491 Experiments with sendmail showed that it uses recipients for all resent-
2492 headers, totally ignoring the concept of "sets of resent- headers" as described
2493 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2494 with all the addresses in one instance of each header.
2496 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2497 error for -t if there were resent- headers in the message. However, after a
2498 discussion on the mailing list, I've learned that there are MUAs that use
2499 resent- headers with -t, and also that the stuff about sets of resent- headers
2500 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2501 message with -t and resent- header lines makes sure that only *its* resent-
2502 headers are present; previous ones are often renamed as X-resent- for example.
2504 Consequently, Exim has been changed so that, if any resent- header lines are
2505 present, the recipients are taken from all of the appropriate resent- lines,
2506 and not from the ordinary To:, Cc:, etc. */
2511 error_block **bnext = &bad_addresses;
2513 if (extract_addresses_remove_arguments)
2515 while (recipients_count-- > 0)
2517 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2518 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2519 tree_add_nonrecipient(s);
2521 recipients_list = NULL;
2522 recipients_count = recipients_list_max = 0;
2525 /* Now scan the headers */
2527 for (header_line * h = header_list->next; h; h = h->next)
2529 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2530 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2532 uschar *s = Ustrchr(h->text, ':') + 1;
2533 while (isspace(*s)) s++;
2535 f.parse_allow_group = TRUE; /* Allow address group syntax */
2539 uschar *ss = parse_find_address_end(s, FALSE);
2540 uschar *recipient, *errmess, *pp;
2541 int start, end, domain;
2543 /* Check on maximum */
2545 if (recipients_max > 0 && ++rcount > recipients_max)
2546 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2547 US"message rejected: ", error_rc, stdin, NULL);
2548 /* Does not return */
2550 /* Make a copy of the address, and remove any internal newlines. These
2551 may be present as a result of continuations of the header line. The
2552 white space that follows the newline must not be removed - it is part
2555 pp = recipient = store_get(ss - s + 1, is_tainted(s));
2556 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2561 BOOL b = allow_utf8_domains;
2562 allow_utf8_domains = TRUE;
2564 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2569 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2570 else allow_utf8_domains = b;
2576 /* Keep a list of all the bad addresses so we can send a single
2577 error message at the end. However, an empty address is not an error;
2578 just ignore it. This can come from an empty group list like
2580 To: Recipients of list:;
2582 If there are no recipients at all, an error will occur later. */
2584 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2586 int len = Ustrlen(s);
2587 error_block *b = store_get(sizeof(error_block), FALSE);
2588 while (len > 0 && isspace(s[len-1])) len--;
2590 b->text1 = string_printing(string_copyn(s, len));
2596 /* If the recipient is already in the nonrecipients tree, it must
2597 have appeared on the command line with the option extract_addresses_
2598 remove_arguments set. Do not add it to the recipients, and keep a note
2599 that this has happened, in order to give a better error if there are
2600 no recipients left. */
2602 else if (recipient != NULL)
2604 if (tree_search(tree_nonrecipients, recipient) == NULL)
2605 receive_add_recipient(recipient, -1);
2607 extracted_ignored = TRUE;
2610 /* Move on past this address */
2612 s = ss + (*ss? 1:0);
2613 while (isspace(*s)) s++;
2614 } /* Next address */
2616 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2617 f.parse_found_group = FALSE;
2619 /* If this was the bcc: header, mark it "old", which means it
2620 will be kept on the spool, but not transmitted as part of the
2623 if (h->type == htype_bcc) h->type = htype_old;
2624 } /* For appropriate header line */
2625 } /* For each header line */
2629 /* Now build the unique message id. This has changed several times over the
2630 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2631 Retaining all the history in the comment has become too unwieldy - read
2632 previous release sources if you want it.
2634 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2635 The first part is the current time, in seconds. The second part is the current
2636 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2637 can hold a number in the range 0-3843. It used to be a computed sequence
2638 number, but is now the fractional component of the current time in units of
2639 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2640 received, Exim ensures that the timer has ticked at the appropriate level
2641 before proceeding, to avoid duplication if the pid happened to be re-used
2642 within the same time period. It seems likely that most messages will take at
2643 least half a millisecond to be received, so no delay will normally be
2644 necessary. At least for some time...
2646 There is a modification when localhost_number is set. Formerly this was allowed
2647 to be as large as 255. Now it is restricted to the range 0-16, and the final
2648 component of the message id becomes (localhost_number * 200) + fractional time
2649 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2651 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2652 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2653 still allows the tttttt field to hold a large enough number to last for some
2654 more decades, and the final two-digit field can hold numbers up to 1295, which
2655 is enough for milliseconds (instead of 1/2000 of a second).
2657 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2658 pid, so it is probably safe because pids have to be positive. The
2659 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2660 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2662 Note that string_base62() returns its data in a static storage block, so it
2663 must be copied before calling string_base62() again. It always returns exactly
2666 There doesn't seem to be anything in the RFC which requires a message id to
2667 start with a letter, but Smail was changed to ensure this. The external form of
2668 the message id (as supplied by string expansion) therefore starts with an
2669 additional leading 'E'. The spool file names do not include this leading
2670 letter and it is not used internally.
2672 NOTE: If ever the format of message ids is changed, the regular expression for
2673 checking that a string is in this format must be updated in a corresponding
2674 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2675 must also be changed to reflect the correct string length. The queue-sort code
2676 needs to know the layout. Then, of course, other programs that rely on the
2677 message id format will need updating too. */
2679 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2680 message_id[6] = '-';
2681 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2683 /* Deal with the case where the host number is set. The value of the number was
2684 checked when it was read, to ensure it isn't too big. The timing granularity is
2685 left in id_resolution so that an appropriate wait can be done after receiving
2686 the message, if necessary (we hope it won't be). */
2688 if (host_number_string)
2690 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2691 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2692 string_base62((long int)(
2693 host_number * (1000000/id_resolution) +
2694 message_id_tv.tv_usec/id_resolution)) + 4);
2697 /* Host number not set: final field is just the fractional time at an
2698 appropriate resolution. */
2702 id_resolution = BASE_62 == 62 ? 500 : 1000;
2703 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2704 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2707 /* Add the current message id onto the current process info string if
2710 (void)string_format(process_info + process_info_len,
2711 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2713 /* If we are using multiple input directories, set up the one for this message
2714 to be the least significant base-62 digit of the time of arrival. Otherwise
2715 ensure that it is an empty string. */
2717 set_subdir_str(message_subdir, message_id, 0);
2719 /* Now that we have the message-id, if there is no message-id: header, generate
2720 one, but only for local (without suppress_local_fixups) or submission mode
2721 messages. This can be user-configured if required, but we had better flatten
2722 any illegal characters therein. */
2725 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2727 uschar *id_text = US"";
2728 uschar *id_domain = primary_hostname;
2731 /* Permit only letters, digits, dots, and hyphens in the domain */
2733 if (message_id_domain)
2735 uschar *new_id_domain = expand_string(message_id_domain);
2738 if (!f.expand_string_forcedfail)
2739 log_write(0, LOG_MAIN|LOG_PANIC,
2740 "expansion of \"%s\" (message_id_header_domain) "
2741 "failed: %s", message_id_domain, expand_string_message);
2743 else if (*new_id_domain)
2745 id_domain = new_id_domain;
2746 for (uschar * p = id_domain; *p; p++)
2747 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2751 /* Permit all characters except controls and RFC 2822 specials in the
2752 additional text part. */
2754 if (message_id_text)
2756 uschar *new_id_text = expand_string(message_id_text);
2759 if (!f.expand_string_forcedfail)
2760 log_write(0, LOG_MAIN|LOG_PANIC,
2761 "expansion of \"%s\" (message_id_header_text) "
2762 "failed: %s", message_id_text, expand_string_message);
2764 else if (*new_id_text)
2766 id_text = new_id_text;
2767 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2771 /* Add the header line.
2772 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2773 appended, to preserve classical expectations of header ordering. */
2775 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2776 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2777 *id_text == 0 ? "" : ".", id_text, id_domain);
2779 /* Arrange for newly-created Message-Id to be logged */
2783 msgid_header_newly_created = TRUE;
2788 /* If we are to log recipients, keep a copy of the raw ones before any possible
2789 rewriting. Must copy the count, because later ACLs and the local_scan()
2790 function may mess with the real recipients. */
2792 if (LOGGING(received_recipients))
2794 raw_recipients = store_get(recipients_count * sizeof(uschar *), FALSE);
2795 for (int i = 0; i < recipients_count; i++)
2796 raw_recipients[i] = string_copy(recipients_list[i].address);
2797 raw_recipients_count = recipients_count;
2800 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2801 recipients will get here only if the conditions were right (allow_unqualified_
2802 recipient is TRUE). */
2804 for (int i = 0; i < recipients_count; i++)
2805 recipients_list[i].address = /* deconst ok as src was not cont */
2806 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2807 global_rewrite_rules, rewrite_existflags);
2809 /* If there is no From: header, generate one for local (without
2810 suppress_local_fixups) or submission_mode messages. If there is no sender
2811 address, but the sender is local or this is a local delivery error, use the
2812 originator login. This shouldn't happen for genuine bounces, but might happen
2813 for autoreplies. The addition of From: must be done *before* checking for the
2814 possible addition of a Sender: header, because untrusted_set_sender allows an
2815 untrusted user to set anything in the envelope (which might then get info
2816 From:) but we still want to ensure a valid Sender: if it is required. */
2819 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2821 const uschar * oname = US"";
2823 /* Use the originator_name if this is a locally submitted message and the
2824 caller is not trusted. For trusted callers, use it only if -F was used to
2825 force its value or if we have a non-SMTP message for which -f was not used
2826 to set the sender. */
2828 if (!sender_host_address)
2830 if (!f.trusted_caller || f.sender_name_forced ||
2831 (!smtp_input && !f.sender_address_forced))
2832 oname = originator_name;
2835 /* For non-locally submitted messages, the only time we use the originator
2836 name is when it was forced by the /name= option on control=submission. */
2838 else if (submission_name) oname = submission_name;
2840 /* Envelope sender is empty */
2842 if (!*sender_address)
2844 uschar *fromstart, *fromend;
2846 fromstart = string_sprintf("%sFrom: %s%s",
2847 resent_prefix, oname, *oname ? " <" : "");
2848 fromend = *oname ? US">" : US"";
2850 if (f.sender_local || f.local_error_message)
2851 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2852 local_part_quote(originator_login), qualify_domain_sender,
2855 else if (f.submission_mode && authenticated_id)
2857 if (!submission_domain)
2858 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2859 local_part_quote(authenticated_id), qualify_domain_sender,
2862 else if (!*submission_domain) /* empty => whole address set */
2863 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2867 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2868 local_part_quote(authenticated_id), submission_domain, fromend);
2870 from_header = header_last; /* To get it checked for Sender: */
2874 /* There is a non-null envelope sender. Build the header using the original
2875 sender address, before any rewriting that might have been done while
2880 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2883 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2886 from_header = header_last; /* To get it checked for Sender: */
2891 /* If the sender is local (without suppress_local_fixups), or if we are in
2892 submission mode and there is an authenticated_id, check that an existing From:
2893 is correct, and if not, generate a Sender: header, unless disabled. Any
2894 previously-existing Sender: header was removed above. Note that sender_local,
2895 as well as being TRUE if the caller of exim is not trusted, is also true if a
2896 trusted caller did not supply a -f argument for non-smtp input. To allow
2897 trusted callers to forge From: without supplying -f, we have to test explicitly
2898 here. If the From: header contains more than one address, then the call to
2899 parse_extract_address fails, and a Sender: header is inserted, as required. */
2902 && ( f.active_local_from_check
2903 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2904 || f.submission_mode && authenticated_id
2907 BOOL make_sender = TRUE;
2908 int start, end, domain;
2910 uschar *from_address =
2911 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2912 &start, &end, &domain, FALSE);
2913 uschar *generated_sender_address;
2915 generated_sender_address = f.submission_mode
2916 ? !submission_domain
2917 ? string_sprintf("%s@%s",
2918 local_part_quote(authenticated_id), qualify_domain_sender)
2919 : !*submission_domain /* empty => full address */
2920 ? string_sprintf("%s", authenticated_id)
2921 : string_sprintf("%s@%s",
2922 local_part_quote(authenticated_id), submission_domain)
2923 : string_sprintf("%s@%s",
2924 local_part_quote(originator_login), qualify_domain_sender);
2926 /* Remove permitted prefixes and suffixes from the local part of the From:
2927 address before doing the comparison with the generated sender. */
2932 uschar *at = domain ? from_address + domain - 1 : NULL;
2935 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2936 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2938 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2939 from_address += slen;
2943 if ( strcmpic(generated_sender_address, from_address) == 0
2944 || (!domain && strcmpic(from_address, originator_login) == 0))
2945 make_sender = FALSE;
2948 /* We have to cause the Sender header to be rewritten if there are
2949 appropriate rewriting rules. */
2952 if (f.submission_mode && !submission_name)
2953 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2954 generated_sender_address);
2956 header_add(htype_sender, "%sSender: %s <%s>\n",
2958 f.submission_mode ? submission_name : originator_name,
2959 generated_sender_address);
2961 /* Ensure that a non-null envelope sender address corresponds to the
2962 submission mode sender address. */
2964 if (f.submission_mode && *sender_address)
2966 if (!sender_address_unrewritten)
2967 sender_address_unrewritten = sender_address;
2968 sender_address = generated_sender_address;
2969 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2970 log_write(L_address_rewrite, LOG_MAIN,
2971 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2972 sender_address_unrewritten, generated_sender_address);
2976 /* If there are any rewriting rules, apply them to the sender address, unless
2977 it has already been rewritten as part of verification for SMTP input. */
2979 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2981 /* deconst ok as src was not const */
2982 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
2983 global_rewrite_rules, rewrite_existflags);
2984 DEBUG(D_receive|D_rewrite)
2985 debug_printf("rewritten sender = %s\n", sender_address);
2989 /* The headers must be run through rewrite_header(), because it ensures that
2990 addresses are fully qualified, as well as applying any rewriting rules that may
2993 Qualification of header addresses in a message from a remote host happens only
2994 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2995 appropriate. For local messages, qualification always happens, unless -bnq is
2996 used to explicitly suppress it. No rewriting is done for an unqualified address
2997 that is left untouched.
2999 We start at the second header, skipping our own Received:. This rewriting is
3000 documented as happening *after* recipient addresses are taken from the headers
3001 by the -t command line option. An added Sender: gets rewritten here. */
3003 for (header_line * h = header_list->next; h; h = h->next)
3005 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3006 rewrite_existflags, TRUE);
3011 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3012 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3013 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3014 exists, this applies to the set of resent- headers rather than the normal set.
3016 The requirement for a recipient header has been removed in RFC 2822. At this
3017 point in the code, earlier versions of Exim added a To: header for locally
3018 submitted messages, and an empty Bcc: header for others. In the light of the
3019 changes in RFC 2822, this was dropped in November 2003. */
3022 /* If there is no date header, generate one if the message originates locally
3023 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3024 submission mode flag is set. Messages without Date: are not valid, but it seems
3025 to be more confusing if Exim adds one to all remotely-originated messages.
3026 As per Message-Id, we prepend if resending, else append.
3029 if ( !date_header_exists
3030 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3031 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3032 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3034 search_tidyup(); /* Free any cached resources */
3036 /* Show the complete set of headers if debugging. Note that the first one (the
3037 new Received:) has not yet been set. */
3041 debug_printf(">>Headers after rewriting and local additions:\n");
3042 for (header_line * h = header_list->next; h; h = h->next)
3043 debug_printf("%c %s", h->type, h->text);
3047 /* The headers are now complete in store. If we are running in filter
3048 testing mode, that is all this function does. Return TRUE if the message
3049 ended with a dot. */
3051 if (filter_test != FTEST_NONE)
3053 process_info[process_info_len] = 0;
3054 return message_ended == END_DOT;
3057 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3058 think more if it could be handled. Cannot do onward CHUNKING unless
3059 inbound is, but inbound chunking ought to be ok with outbound plain.
3060 Could we do onward CHUNKING given inbound CHUNKING?
3062 if (chunking_state > CHUNKING_OFFERED)
3063 cancel_cutthrough_connection(FALSE, US"chunking active");
3065 /* Cutthrough delivery:
3066 We have to create the Received header now rather than at the end of reception,
3067 so the timestamp behaviour is a change to the normal case.
3068 Having created it, send the headers to the destination. */
3070 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3072 if (received_count > received_headers_max)
3074 cancel_cutthrough_connection(TRUE, US"too many headers");
3075 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3076 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3077 "Too many \"Received\" headers",
3079 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3080 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3081 message_id[0] = 0; /* Indicate no message accepted */
3082 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3083 goto TIDYUP; /* Skip to end of function */
3085 received_header_gen();
3086 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3087 (void) cutthrough_headers_send();
3091 /* Open a new spool file for the data portion of the message. We need
3092 to access it both via a file descriptor and a stream. Try to make the
3093 directory if it isn't there. */
3095 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3096 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3098 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3100 if (errno == ENOENT)
3102 (void) directory_make(spool_directory,
3103 spool_sname(US"input", message_subdir),
3104 INPUT_DIRECTORY_MODE, TRUE);
3105 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3108 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3109 spool_name, strerror(errno));
3112 /* Make sure the file's group is the Exim gid, and double-check the mode
3113 because the group setting doesn't always get set automatically. */
3115 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3116 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3117 "Failed setting ownership on spool file %s: %s",
3118 spool_name, strerror(errno));
3119 (void)fchmod(data_fd, SPOOL_MODE);
3121 /* We now have data file open. Build a stream for it and lock it. We lock only
3122 the first line of the file (containing the message ID) because otherwise there
3123 are problems when Exim is run under Cygwin (I'm told). See comments in
3124 spool_in.c, where the same locking is done. */
3126 spool_data_file = fdopen(data_fd, "w+");
3127 lock_data.l_type = F_WRLCK;
3128 lock_data.l_whence = SEEK_SET;
3129 lock_data.l_start = 0;
3130 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3132 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3133 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3134 errno, strerror(errno));
3136 /* We have an open, locked data file. Write the message id to it to make it
3137 self-identifying. Then read the remainder of the input of this message and
3138 write it to the data file. If the variable next != NULL, it contains the first
3139 data line (which was read as a header but then turned out not to have the right
3140 format); write it (remembering that it might contain binary zeros). The result
3141 of fwrite() isn't inspected; instead we call ferror() below. */
3143 fprintf(spool_data_file, "%s-D\n", message_id);
3146 uschar *s = next->text;
3147 int len = next->slen;
3148 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3149 body_linecount++; /* Assumes only 1 line */
3152 /* Note that we might already be at end of file, or the logical end of file
3153 (indicated by '.'), or might have encountered an error while writing the
3154 message id or "next" line. */
3156 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3160 message_ended = chunking_state <= CHUNKING_OFFERED
3161 ? read_message_data_smtp(spool_data_file)
3163 ? read_message_bdat_smtp_wire(spool_data_file)
3164 : read_message_bdat_smtp(spool_data_file);
3165 receive_linecount++; /* The terminating "." line */
3168 message_ended = read_message_data(spool_data_file);
3170 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3171 message_linecount += body_linecount;
3173 switch (message_ended)
3175 /* Handle premature termination of SMTP */
3180 Uunlink(spool_name); /* Lose data file when closed */
3181 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3182 message_id[0] = 0; /* Indicate no message accepted */
3183 smtp_reply = handle_lost_connection(US"");
3185 goto TIDYUP; /* Skip to end of function */
3189 /* Handle message that is too big. Don't use host_or_ident() in the log
3190 message; we want to see the ident value even for non-remote messages. */
3193 Uunlink(spool_name); /* Lose the data file when closed */
3194 cancel_cutthrough_connection(TRUE, US"mail too big");
3195 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3197 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3198 "message too big: read=%d max=%d",
3200 sender_fullhost ? " H=" : "",
3201 sender_fullhost ? sender_fullhost : US"",
3202 sender_ident ? " U=" : "",
3203 sender_ident ? sender_ident : US"",
3205 thismessage_size_limit);
3209 smtp_reply = US"552 Message size exceeds maximum permitted";
3210 message_id[0] = 0; /* Indicate no message accepted */
3211 goto TIDYUP; /* Skip to end of function */
3215 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3216 give_local_error(ERRMESS_TOOBIG,
3217 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3218 US"message rejected: ", error_rc, spool_data_file, header_list);
3219 /* Does not return */
3223 /* Handle bad BDAT protocol sequence */
3226 Uunlink(spool_name); /* Lose the data file when closed */
3227 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3228 smtp_reply = US""; /* Response already sent */
3229 message_id[0] = 0; /* Indicate no message accepted */
3230 goto TIDYUP; /* Skip to end of function */
3234 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3235 example, there may be some expansion in an ACL that uses a timer.) */
3237 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3239 /* The message body has now been read into the data file. Call fflush() to
3240 empty the buffers in C, and then call fsync() to get the data written out onto
3241 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3242 having to do this). If there was an I/O error on either input or output,
3243 attempt to send an error message, and unlink the spool file. For non-SMTP input
3244 we can then give up. Note that for SMTP input we must swallow the remainder of
3245 the input in cases of output errors, since the far end doesn't expect to see
3246 anything until the terminating dot line is sent. */
3248 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3249 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3251 uschar *msg_errno = US strerror(errno);
3252 BOOL input_error = (receive_ferror)() != 0;
3253 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3254 input_error? "Input read" : "Spool write",
3256 sender_fullhost ? sender_fullhost : sender_ident);
3258 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3259 Uunlink(spool_name); /* Lose the data file */
3260 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3265 smtp_reply = US"451 Error while reading input data";
3268 smtp_reply = US"451 Error while writing spool file";
3269 receive_swallow_smtp();
3271 message_id[0] = 0; /* Indicate no message accepted */
3272 goto TIDYUP; /* Skip to end of function */
3277 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3278 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3280 /* Does not return */
3285 /* No I/O errors were encountered while writing the data file. */
3287 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3288 gettimeofday(&received_time_complete, NULL);
3291 /* If there were any bad addresses extracted by -t, or there were no recipients
3292 left after -t, send a message to the sender of this message, or write it to
3293 stderr if the error handling option is set that way. Note that there may
3294 legitimately be no recipients for an SMTP message if they have all been removed
3297 We need to rewind the data file in order to read it. In the case of no
3298 recipients or stderr error writing, throw the data file away afterwards, and
3299 exit. (This can't be SMTP, which always ensures there's at least one
3300 syntactically good recipient address.) */
3302 if (extract_recip && (bad_addresses || recipients_count == 0))
3306 if (recipients_count == 0) debug_printf("*** No recipients\n");
3309 debug_printf("*** Bad address(es)\n");
3310 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3311 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3315 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3316 message_id, bad_addresses ? "bad addresses" : "no recipients");
3318 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3320 /* If configured to send errors to the sender, but this fails, force
3321 a failure error code. We use a special one for no recipients so that it
3322 can be detected by the autoreply transport. Otherwise error_rc is set to
3323 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3324 it is EXIT_SUCCESS. */
3326 if (error_handling == ERRORS_SENDER)
3328 if (!moan_to_sender(
3330 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3331 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3332 bad_addresses, header_list, spool_data_file, FALSE
3334 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3339 if (extracted_ignored)
3340 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3342 fprintf(stderr, "exim: no recipients in message\n");
3345 fprintf(stderr, "exim: invalid address%s",
3346 bad_addresses->next ? "es:\n" : ":");
3347 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3348 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3349 bad_addresses->text2);
3353 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3355 Uunlink(spool_name);
3356 (void)fclose(spool_data_file);
3357 exim_exit(error_rc);
3361 /* Data file successfully written. Generate text for the Received: header by
3362 expanding the configured string, and adding a timestamp. By leaving this
3363 operation till now, we ensure that the timestamp is the time that message
3364 reception was completed. However, this is deliberately done before calling the
3365 data ACL and local_scan().
3367 This Received: header may therefore be inspected by the data ACL and by code in
3368 the local_scan() function. When they have run, we update the timestamp to be
3369 the final time of reception.
3371 If there is just one recipient, set up its value in the $received_for variable
3372 for use when we generate the Received: header.
3374 Note: the checking for too many Received: headers is handled by the delivery
3376 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3378 if (!received_header->text) /* Non-cutthrough case */
3380 received_header_gen();
3382 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3384 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3385 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3387 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3388 now, before running the DATA ACL. */
3390 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3393 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3394 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3396 /* If an ACL is specified for checking things at this stage of reception of a
3397 message, run it, unless all the recipients were removed by "discard" in earlier
3398 ACLs. That is the only case in which recipients_count can be zero at this
3399 stage. Set deliver_datafile to point to the data file so that $message_body and
3400 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3403 deliver_datafile = data_fd;
3406 f.enable_dollar_recipients = TRUE;
3408 if (recipients_count == 0)
3409 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3413 /* Handle interactive SMTP messages */
3415 if (smtp_input && !smtp_batched_input)
3418 #ifndef DISABLE_DKIM
3419 if (!f.dkim_disable_verify)
3421 /* Finish verification */
3422 dkim_exim_verify_finish();
3424 /* Check if we must run the DKIM ACL */
3425 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3427 uschar * dkim_verify_signers_expanded =
3428 expand_string(dkim_verify_signers);
3429 gstring * results = NULL;
3433 gstring * seen_items = NULL;
3434 int old_pool = store_pool;
3436 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3438 if (!(ptr = dkim_verify_signers_expanded))
3439 log_write(0, LOG_MAIN|LOG_PANIC,
3440 "expansion of dkim_verify_signers option failed: %s",
3441 expand_string_message);
3443 /* Default to OK when no items are present */
3445 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3447 /* Prevent running ACL for an empty item */
3448 if (!item || !*item) continue;
3450 /* Only run ACL once for each domain or identity,
3451 no matter how often it appears in the expanded list. */
3455 const uschar * seen_items_list = string_from_gstring(seen_items);
3457 BOOL seen_this_item = FALSE;
3459 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3461 if (Ustrcmp(seen_item,item) == 0)
3463 seen_this_item = TRUE;
3470 debug_printf("acl_smtp_dkim: skipping signer %s, "
3471 "already seen\n", item);
3475 seen_items = string_catn(seen_items, US":", 1);
3477 seen_items = string_cat(seen_items, item);
3479 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3483 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3484 "skipping remaining items\n", rc, item);
3485 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3489 dkim_verify_status = string_from_gstring(results);
3490 store_pool = old_pool;
3491 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3494 recipients_count = 0;
3495 blackholed_by = US"DKIM ACL";
3497 blackhole_log_msg = string_sprintf(": %s", log_msg);
3501 Uunlink(spool_name);
3502 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3503 smtp_yield = FALSE; /* No more messages after dropped connection */
3504 smtp_reply = US""; /* Indicate reply already sent */
3505 message_id[0] = 0; /* Indicate no message accepted */
3506 goto TIDYUP; /* Skip to end of function */
3510 dkim_exim_verify_log_all();
3512 #endif /* DISABLE_DKIM */
3514 #ifdef WITH_CONTENT_SCAN
3515 if ( recipients_count > 0
3517 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3520 #endif /* WITH_CONTENT_SCAN */
3522 #ifdef SUPPORT_DMARC
3523 dmarc_store_data(from_header);
3526 #ifndef DISABLE_PRDR
3527 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3530 int all_fail = FAIL;
3532 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3533 /* Loop through recipients, responses must be in same order received */
3534 for (unsigned int c = 0; recipients_count > c; c++)
3536 uschar * addr= recipients_list[c].address;
3537 uschar * msg= US"PRDR R=<%s> %s";
3540 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3541 addr, c+1, recipients_count);
3542 rc = acl_check(ACL_WHERE_PRDR, addr,
3543 acl_smtp_data_prdr, &user_msg, &log_msg);
3545 /* If any recipient rejected content, indicate it in final message */
3547 /* If all recipients rejected, indicate in final message */
3552 case OK: case DISCARD: code = US"250"; break;
3553 case DEFER: code = US"450"; break;
3554 default: code = US"550"; break;
3556 if (user_msg != NULL)
3557 smtp_user_msg(code, user_msg);
3562 case OK: case DISCARD:
3563 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3565 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3567 msg = string_sprintf(CS msg, addr, "refusal"); break;
3569 smtp_user_msg(code, msg);
3571 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3572 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3573 else log_write(0, LOG_MAIN, "%s", CS msg);
3575 if (rc != OK) { receive_remove_recipient(addr); c--; }
3577 /* Set up final message, used if data acl gives OK */
3578 smtp_reply = string_sprintf("%s id=%s message %s",
3579 all_fail == FAIL ? US"550" : US"250",
3582 ? US"rejected for all recipients"
3585 : US"accepted for some recipients");
3586 if (recipients_count == 0)
3588 message_id[0] = 0; /* Indicate no message accepted */
3593 prdr_requested = FALSE;
3594 #endif /* !DISABLE_PRDR */
3596 /* Check the recipients count again, as the MIME ACL might have changed
3599 if (acl_smtp_data != NULL && recipients_count > 0)
3601 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3602 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3605 recipients_count = 0;
3606 blackholed_by = US"DATA ACL";
3608 blackhole_log_msg = string_sprintf(": %s", log_msg);
3609 cancel_cutthrough_connection(TRUE, US"data acl discard");
3613 Uunlink(spool_name);
3614 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3615 #ifdef WITH_CONTENT_SCAN
3618 #ifdef EXPERIMENTAL_DCC
3621 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3622 smtp_yield = FALSE; /* No more messages after dropped connection */
3623 smtp_reply = US""; /* Indicate reply already sent */
3624 message_id[0] = 0; /* Indicate no message accepted */
3625 goto TIDYUP; /* Skip to end of function */
3630 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3631 we cannot take different actions for permanent and temporary rejections. */
3636 #ifdef WITH_CONTENT_SCAN
3637 if ( acl_not_smtp_mime
3638 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3642 #endif /* WITH_CONTENT_SCAN */
3646 uschar *user_msg, *log_msg;
3647 f.authentication_local = TRUE;
3648 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3651 recipients_count = 0;
3652 blackholed_by = US"non-SMTP ACL";
3654 blackhole_log_msg = string_sprintf(": %s", log_msg);
3658 Uunlink(spool_name);
3659 #ifdef WITH_CONTENT_SCAN
3662 #ifdef EXPERIMENTAL_DCC
3665 /* The ACL can specify where rejections are to be logged, possibly
3666 nowhere. The default is main and reject logs. */
3668 if (log_reject_target)
3669 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3670 sender_address, log_msg);
3672 if (!user_msg) user_msg = US"local configuration problem";
3673 if (smtp_batched_input)
3674 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3675 /* Does not return */
3678 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3679 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3680 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3682 /* Does not return */
3685 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3689 /* The applicable ACLs have been run */
3691 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3692 if (f.queue_only_policy) queued_by = US"ACL";
3695 #ifdef WITH_CONTENT_SCAN
3699 #ifdef EXPERIMENTAL_DCC
3704 #ifdef HAVE_LOCAL_SCAN
3705 /* The final check on the message is to run the scan_local() function. The
3706 version supplied with Exim always accepts, but this is a hook for sysadmins to
3707 supply their own checking code. The local_scan() function is run even when all
3708 the recipients have been discarded. */
3710 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3712 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3713 deleted, and the incident gets logged. */
3715 if (sigsetjmp(local_scan_env, 1) == 0)
3717 had_local_scan_crash = 0;
3718 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3719 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3720 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3721 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3723 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3724 local_scan_timeout);
3725 local_scan_data = NULL;
3727 had_local_scan_timeout = 0;
3728 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3729 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3730 rc = local_scan(data_fd, &local_scan_data);
3732 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3734 f.enable_dollar_recipients = FALSE;
3736 store_pool = POOL_MAIN; /* In case changed */
3737 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3740 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3741 os_non_restarting_signal(SIGFPE, SIG_DFL);
3742 os_non_restarting_signal(SIGILL, SIG_DFL);
3743 os_non_restarting_signal(SIGBUS, SIG_DFL);
3747 if (had_local_scan_crash)
3749 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3750 "signal %d - message temporarily rejected (size %d)",
3751 had_local_scan_crash, message_size);
3752 receive_bomb_out(US"local-scan-error", US"local verification problem");
3753 /* Does not return */
3755 if (had_local_scan_timeout)
3757 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3758 "message temporarily rejected (size %d)", message_size);
3759 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3760 /* Does not return */
3764 /* The length check is paranoia against some runaway code, and also because
3765 (for a success return) lines in the spool file are read into big_buffer. */
3767 if (local_scan_data)
3769 int len = Ustrlen(local_scan_data);
3770 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3771 local_scan_data = string_copyn(local_scan_data, len);
3774 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3776 if (!f.deliver_freeze) /* ACL might have already frozen */
3778 f.deliver_freeze = TRUE;
3779 deliver_frozen_at = time(NULL);
3780 frozen_by = US"local_scan()";
3782 rc = LOCAL_SCAN_ACCEPT;
3784 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3786 if (!f.queue_only_policy) /* ACL might have already queued */
3788 f.queue_only_policy = TRUE;
3789 queued_by = US"local_scan()";
3791 rc = LOCAL_SCAN_ACCEPT;
3794 /* Message accepted: remove newlines in local_scan_data because otherwise
3795 the spool file gets corrupted. Ensure that all recipients are qualified. */
3797 if (rc == LOCAL_SCAN_ACCEPT)
3799 if (local_scan_data)
3800 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3801 for (int i = 0; i < recipients_count; i++)
3803 recipient_item *r = recipients_list + i;
3804 r->address = rewrite_address_qualify(r->address, TRUE);
3806 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3808 if (recipients_count == 0 && !blackholed_by)
3809 blackholed_by = US"local_scan";
3812 /* Message rejected: newlines permitted in local_scan_data to generate
3813 multiline SMTP responses. */
3817 uschar *istemp = US"";
3821 errmsg = local_scan_data;
3823 Uunlink(spool_name); /* Cancel this message */
3827 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3828 "rejection given", rc);
3831 case LOCAL_SCAN_REJECT_NOLOGHDR:
3832 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3835 case LOCAL_SCAN_REJECT:
3836 smtp_code = US"550";
3837 if (!errmsg) errmsg = US"Administrative prohibition";
3840 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3841 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3844 case LOCAL_SCAN_TEMPREJECT:
3846 smtp_code = US"451";
3847 if (!errmsg) errmsg = US"Temporary local problem";
3848 istemp = US"temporarily ";
3852 g = string_append(NULL, 2, US"F=",
3853 sender_address[0] == 0 ? US"<>" : sender_address);
3854 g = add_host_info_for_log(g);
3856 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3857 string_from_gstring(g), istemp, string_printing(errmsg));
3860 if (!smtp_batched_input)
3862 smtp_respond(smtp_code, 3, TRUE, errmsg);
3863 message_id[0] = 0; /* Indicate no message accepted */
3864 smtp_reply = US""; /* Indicate reply already sent */
3865 goto TIDYUP; /* Skip to end of function */
3868 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3869 /* Does not return */
3872 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3873 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3874 US"message rejected by local scan code: ", error_rc, spool_data_file,
3876 /* Does not return */
3880 /* Reset signal handlers to ignore signals that previously would have caused
3881 the message to be abandoned. */
3883 signal(SIGTERM, SIG_IGN);
3884 signal(SIGINT, SIG_IGN);
3885 #endif /* HAVE_LOCAL_SCAN */
3888 /* Ensure the first time flag is set in the newly-received message. */
3890 f.deliver_firsttime = TRUE;
3892 #ifdef EXPERIMENTAL_BRIGHTMAIL
3894 { /* rewind data file */
3895 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3896 bmi_verdicts = bmi_process_message(header_list, data_fd);
3900 /* Update the timestamp in our Received: header to account for any time taken by
3901 an ACL or by local_scan(). The new time is the time that all reception
3902 processing is complete. */
3904 timestamp = expand_string(US"${tod_full}");
3905 tslen = Ustrlen(timestamp);
3907 memcpy(received_header->text + received_header->slen - tslen - 1,
3910 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3914 f.deliver_freeze = FALSE;
3915 f.queue_only_policy = FALSE;
3918 /* Keep the data file open until we have written the header file, in order to
3919 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3920 don't write the header file, and we unlink the data file. If writing the header
3921 file fails, we have failed to accept this message. */
3923 if (host_checking || blackholed_by)
3925 Uunlink(spool_name);
3926 msg_size = 0; /* Compute size for log line */
3927 for (header_line * h = header_list; h; h = h->next)
3928 if (h->type != '*') msg_size += h->slen;
3931 /* Write the -H file */
3934 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3936 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3937 Uunlink(spool_name); /* Lose the data file */
3941 smtp_reply = US"451 Error in writing spool file";
3942 message_id[0] = 0; /* Indicate no message accepted */
3947 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3948 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3950 /* Does not return */
3955 /* The message has now been successfully received. */
3957 receive_messagecount++;
3959 /* Add data size to written header size. We do not count the initial file name
3960 that is in the file, but we do add one extra for the notional blank line that
3961 precedes the data. This total differs from message_size in that it include the
3962 added Received: header and any other headers that got created locally. */
3964 if (fflush(spool_data_file))
3966 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3967 log_write(0, LOG_MAIN, "%s\n", errmsg);
3968 Uunlink(spool_name); /* Lose the data file */
3972 smtp_reply = US"451 Error in writing spool file";
3973 message_id[0] = 0; /* Indicate no message accepted */
3978 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3979 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3981 /* Does not return */
3984 fstat(data_fd, &statbuf);
3986 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3988 /* Generate a "message received" log entry. We do this by building up a dynamic
3989 string as required. We log the arrival of a new message while the
3990 file is still locked, just in case the machine is *really* fast, and delivers
3991 it first! Include any message id that is in the message - since the syntax of a
3992 message id is actually an addr-spec, we can use the parse routine to canonicalize
3995 rcvd_log_reset_point = store_mark();
3996 g = string_get(256);
3998 g = string_append(g, 2,
3999 fake_response == FAIL ? US"(= " : US"<= ",
4000 sender_address[0] == 0 ? US"<>" : sender_address);
4001 if (message_reference)
4002 g = string_append(g, 2, US" R=", message_reference);
4004 g = add_host_info_for_log(g);
4007 if (LOGGING(tls_cipher) && tls_in.cipher)
4009 g = string_append(g, 2, US" X=", tls_in.cipher);
4010 # ifndef DISABLE_TLS_RESUME
4011 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4012 g = string_catn(g, US"*", 1);
4015 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4016 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4017 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4018 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4019 if (LOGGING(tls_sni) && tls_in.sni)
4020 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4023 if (sender_host_authenticated)
4025 g = string_append(g, 2, US" A=", sender_host_authenticated);
4026 if (authenticated_id)
4028 g = string_append(g, 2, US":", authenticated_id);
4029 if (LOGGING(smtp_mailauth) && authenticated_sender)
4030 g = string_append(g, 2, US":", authenticated_sender);
4034 #ifndef DISABLE_PRDR
4036 g = string_catn(g, US" PRDR", 5);
4039 #ifdef SUPPORT_PROXY
4040 if (proxy_session && LOGGING(proxy))
4041 g = string_append(g, 2, US" PRX=", proxy_local_address);
4044 if (chunking_state > CHUNKING_OFFERED)
4045 g = string_catn(g, US" K", 2);
4047 g = string_fmt_append(g, " S=%d", msg_size);
4049 /* log 8BITMIME mode announced in MAIL_FROM
4053 if (LOGGING(8bitmime))
4054 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4056 #ifndef DISABLE_DKIM
4057 if (LOGGING(dkim) && dkim_verify_overall)
4058 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4059 # ifdef EXPERIMENTAL_ARC
4060 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4061 g = string_catn(g, US" ARC", 4);
4065 if (LOGGING(receive_time))
4067 struct timeval diff = received_time_complete;
4068 timediff(&diff, &received_time);
4069 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4073 g = string_append(g, 2, US" Q=", queue_name);
4075 /* If an addr-spec in a message-id contains a quoted string, it can contain
4076 any characters except " \ and CR and so in particular it can contain NL!
4077 Therefore, make sure we use a printing-characters only version for the log.
4078 Also, allow for domain literals in the message id. */
4080 if ( LOGGING(msg_id) && msgid_header
4081 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4085 BOOL save_allow_domain_literals = allow_domain_literals;
4086 allow_domain_literals = TRUE;
4087 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4088 &errmsg, &start, &end, &domain, FALSE);
4089 allow_domain_literals = save_allow_domain_literals;
4091 g = string_append(g, 2,
4092 msgid_header_newly_created ? US" id*=" : US" id=",
4093 string_printing(old_id));
4096 /* If subject logging is turned on, create suitable printing-character
4097 text. By expanding $h_subject: we make use of the MIME decoding. */
4099 if (LOGGING(subject) && subject_header)
4101 uschar *p = big_buffer;
4102 uschar *ss = expand_string(US"$h_subject:");
4104 /* Backslash-quote any double quotes or backslashes so as to make a
4105 a C-like string, and turn any non-printers into escape sequences. */
4108 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4110 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4115 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4118 /* Terminate the string: string_cat() and string_append() leave room, but do
4119 not put the zero in. */
4121 (void) string_from_gstring(g);
4123 /* Create a message log file if message logs are being used and this message is
4124 not blackholed. Write the reception stuff to it. We used to leave message log
4125 creation until the first delivery, but this has proved confusing for some
4128 if (message_logs && !blackholed_by)
4131 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4133 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4137 (void)directory_make(spool_directory,
4138 spool_sname(US"msglog", message_subdir),
4139 MSGLOG_DIRECTORY_MODE, TRUE);
4140 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4144 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4145 m_name, strerror(errno));
4148 FILE *message_log = fdopen(fd, "a");
4151 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4152 m_name, strerror(errno));
4157 uschar *now = tod_stamp(tod_log);
4158 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4159 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4161 if (f.queue_only_policy) fprintf(message_log,
4162 "%s no immediate delivery: queued%s%s by %s\n", now,
4163 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4165 (void)fclose(message_log);
4170 /* Everything has now been done for a successful message except logging its
4171 arrival, and outputting an SMTP response. While writing to the log, set a flag
4172 to cause a call to receive_bomb_out() if the log cannot be opened. */
4174 f.receive_call_bombout = TRUE;
4176 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4177 connection has gone away. This can only be done if there is no unconsumed input
4178 waiting in the local input buffer. We can test for this by calling
4179 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4180 input to be sent following the final dot, so the presence of following input is
4183 If the connection is still present, but there is no unread input for the
4184 socket, the result of a select() call will be zero. If, however, the connection
4185 has gone away, or if there is pending input, the result of select() will be
4186 non-zero. The two cases can be distinguished by trying to read the next input
4187 character. If we succeed, we can unread it so that it remains in the local
4188 buffer for handling later. If not, the connection has been lost.
4190 Of course, since TCP/IP is asynchronous, there is always a chance that the
4191 connection will vanish between the time of this test and the sending of the
4192 response, but the chance of this happening should be small. */
4194 if (smtp_input && sender_host_address && !f.sender_host_notsocket &&
4195 !receive_smtp_buffered())
4197 struct timeval tv = {.tv_sec = 0, .tv_usec = 0};
4198 fd_set select_check;
4199 FD_ZERO(&select_check);
4200 FD_SET(fileno(smtp_in), &select_check);
4202 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4204 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4205 if (c != EOF) (receive_ungetc)(c); else
4207 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4208 smtp_reply = US""; /* No attempt to send a response */
4209 smtp_yield = FALSE; /* Nothing more on this connection */
4211 /* Re-use the log line workspace */
4214 g = string_cat(g, US"SMTP connection lost after final dot");
4215 g = add_host_info_for_log(g);
4216 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4218 /* Delete the files for this aborted message. */
4220 Uunlink(spool_name);
4221 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4222 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4229 /* The connection has not gone away; we really are going to take responsibility
4230 for this message. */
4232 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4235 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4236 the sender's dot (below).
4237 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4238 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4239 in which case pass temp-reject back to initiator and dump the files.
4241 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4243 XXX We do not handle queue-only, freezing, or blackholes.
4245 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4247 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4248 /* Logging was done in finaldot() */
4251 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4252 cutthrough_done = ACCEPTED;
4253 break; /* message_id needed for SMTP accept below */
4255 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4256 ... for which, pass back the exact error */
4257 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4258 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4259 break; /* message_id needed for SMTP accept below */
4261 default: /* Unknown response, or error. Treat as temp-reject. */
4262 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4263 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4264 break; /* message_id needed for SMTP accept below */
4266 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4267 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4268 cutthrough_done = PERM_REJ;
4273 #ifndef DISABLE_PRDR
4274 if(!smtp_reply || prdr_requested)
4279 log_write(0, LOG_MAIN |
4280 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4281 (LOGGING(received_sender) ? LOG_SENDER : 0),
4284 /* Log any control actions taken by an ACL or local_scan(). */
4286 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4287 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4288 "no immediate delivery: queued%s%s by %s",
4289 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4292 f.receive_call_bombout = FALSE;
4294 /* The store for the main log message can be reused */
4295 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4297 /* If the message is frozen, and freeze_tell is set, do the telling. */
4299 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4300 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4301 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4302 message_id, frozen_by, sender_address);
4305 /* Either a message has been successfully received and written to the two spool
4306 files, or an error in writing the spool has occurred for an SMTP message, or
4307 an SMTP message has been rejected for policy reasons, or a message was passed on
4308 by cutthrough delivery. (For a non-SMTP message we will have already given up
4309 because there's no point in carrying on!) For non-cutthrough we must now close
4310 (and thereby unlock) the data file. In the successful case, this leaves the
4311 message on the spool, ready for delivery. In the error case, the spool file will
4312 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4315 For cutthrough we hold the data file locked until we have deleted it, otherwise
4316 a queue-runner could grab it in the window.
4318 A fflush() was done earlier in the expectation that any write errors on the
4319 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4320 possible for fclose() to fail - but what to do? What has happened to the lock
4321 if this happens? We can at least log it; if it is observed on some platform
4322 then we can think about properly declaring the message not-received. */
4326 /* In SMTP sessions we may receive several messages in one connection. After
4327 each one, we wait for the clock to tick at the level of message-id granularity.
4328 This is so that the combination of time+pid is unique, even on systems where the
4329 pid can be re-used within our time interval. We can't shorten the interval
4330 without re-designing the message-id. See comments above where the message id is
4331 created. This is Something For The Future.
4332 Do this wait any time we have created a message-id, even if we rejected the
4333 message. This gives unique IDs for logging done by ACLs.
4334 The initial timestamp must have been obtained via exim_gettime() to avoid
4335 issues on Linux with suspend/resume.
4336 It would be Nicer to only pause before a follow-on message. */
4338 if (id_resolution != 0)
4340 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
4341 exim_wait_tick(&message_id_tv, id_resolution);
4346 process_info[process_info_len] = 0; /* Remove message id */
4347 if (spool_data_file && cutthrough_done == NOT_TRIED)
4349 if (fclose(spool_data_file)) /* Frees the lock */
4350 log_write(0, LOG_MAIN|LOG_PANIC,
4351 "spoolfile error on close: %s", strerror(errno));
4352 spool_data_file = NULL;
4355 /* Now reset signal handlers to their defaults */
4357 signal(SIGTERM, SIG_DFL);
4358 signal(SIGINT, SIG_DFL);
4360 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4361 value, which defaults TRUE - meaning there may be more incoming messages from
4362 this connection. For non-SMTP callers (where there is only ever one message),
4363 the default is FALSE. */
4369 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4370 is set to the response that should be sent. When it is NULL, we generate
4371 default responses. After an ACL error or local_scan() error, the response has
4372 already been sent, and smtp_reply is an empty string to indicate this. */
4374 if (!smtp_batched_input)
4378 if (fake_response != OK)
4379 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4380 3, TRUE, fake_response_text);
4382 /* An OK response is required; use "message" text if present. */
4386 uschar *code = US"250";
4388 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4389 smtp_respond(code, len, TRUE, user_msg);
4392 /* Default OK response */
4394 else if (chunking_state > CHUNKING_OFFERED)
4396 /* If there is more input waiting, no need to flush (probably the client
4397 pipelined QUIT after data). We check only the in-process buffer, not
4400 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4401 receive_smtp_buffered(),
4402 chunking_datasize, message_size+message_linecount, message_id);
4403 chunking_state = CHUNKING_OFFERED;
4406 smtp_printf("250 OK id=%s\r\n", receive_smtp_buffered(), message_id);
4410 "\n**** SMTP testing: that is not a real message id!\n\n");
4413 /* smtp_reply is set non-empty */
4415 else if (smtp_reply[0] != 0)
4416 if (fake_response != OK && smtp_reply[0] == '2')
4417 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4418 fake_response_text);
4420 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4422 switch (cutthrough_done)
4425 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4427 /* Delete spool files */
4428 Uunlink(spool_name);
4429 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4430 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4434 if (cutthrough.defer_pass)
4436 Uunlink(spool_name);
4437 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4438 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4443 if (cutthrough_done != NOT_TRIED)
4445 if (spool_data_file)
4447 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4448 spool_data_file = NULL;
4450 message_id[0] = 0; /* Prevent a delivery from starting */
4451 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4452 cutthrough.defer_pass = FALSE;
4456 /* For batched SMTP, generate an error message on failure, and do
4457 nothing on success. The function moan_smtp_batch() does not return -
4458 it exits from the program with a non-zero return code. */
4460 else if (smtp_reply)
4461 moan_smtp_batch(NULL, "%s", smtp_reply);
4465 /* If blackholing, we can immediately log this message's sad fate. The data
4466 file has already been unlinked, and the header file was never written to disk.
4467 We must now indicate that nothing was received, to prevent a delivery from
4472 const uschar *detail =
4473 #ifdef HAVE_LOCAL_SCAN
4474 local_scan_data ? string_printing(local_scan_data) :
4476 string_sprintf("(%s discarded recipients)", blackholed_by);
4477 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4478 log_write(0, LOG_MAIN, "Completed");
4482 /* Reset headers so that logging of rejects for a subsequent message doesn't
4483 include them. It is also important to set header_last = NULL before exiting
4484 from this function, as this prevents certain rewrites that might happen during
4485 subsequent verifying (of another incoming message) from trying to add headers
4486 when they shouldn't. */
4488 header_list = header_last = NULL;
4490 return yield; /* TRUE if more messages (SMTP only) */
4493 /* End of receive.c */