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;
1668 int prevlines_length = 0;
1669 const int id_resolution = BASE_62 == 62 ? 5000 : 10000;
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. */
1723 /* Time of creation of message_id */
1725 static struct timeval message_id_tv = { 0, 0 };
1728 /* Release any open files that might have been cached while preparing to
1729 accept the message - e.g. by verifying addresses - because reading a message
1730 might take a fair bit of real time. */
1734 /* Extracting the recipient list from an input file is incompatible with
1735 cutthrough delivery with the no-spool option. It shouldn't be possible
1736 to set up the combination, but just in case kill any ongoing connection. */
1737 if (extract_recip || !smtp_input)
1738 cancel_cutthrough_connection(TRUE, US"not smtp input");
1740 /* Initialize the chain of headers by setting up a place-holder for Received:
1741 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1742 pointing to the end of the chain to make adding headers simple. */
1744 received_header = header_list = header_last = store_get(sizeof(header_line), FALSE);
1745 header_list->next = NULL;
1746 header_list->type = htype_old;
1747 header_list->text = NULL;
1748 header_list->slen = 0;
1750 /* Control block for the next header to be read. */
1752 reset_point = store_mark();
1753 next = store_get(sizeof(header_line), FALSE); /* not tainted */
1754 next->text = store_get(header_size, TRUE); /* tainted */
1756 /* Initialize message id to be null (indicating no message read), and the
1757 header names list to be the normal list. Indicate there is no data file open
1758 yet, initialize the size and warning count, and deal with no size limit. */
1761 spool_data_file = NULL;
1766 received_count = 1; /* For the one we will add */
1768 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1770 /* While reading the message, the following counts are computed. */
1772 message_linecount = body_linecount = body_zerocount =
1773 max_received_linelength = 0;
1775 #ifdef WITH_CONTENT_SCAN
1776 /* reset non-per-part mime variables */
1777 mime_is_coverletter = 0;
1779 mime_part_count = -1;
1782 #ifndef DISABLE_DKIM
1783 /* Call into DKIM to set up the context. In CHUNKING mode
1784 we clear the dot-stuffing flag */
1785 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1786 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1789 #ifdef SUPPORT_DMARC
1790 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1793 /* In SMTP sessions we may receive several messages in one connection. Before
1794 each subsequent one, we wait for the clock to tick at the level of message-id
1796 This is so that the combination of time+pid is unique, even on systems where the
1797 pid can be re-used within our time interval. We can't shorten the interval
1798 without re-designing the message-id. See comments above where the message id is
1799 created. This is Something For The Future.
1800 Do this wait any time we have previously created a message-id, even if we
1801 rejected the message. This gives unique IDs for logging done by ACLs.
1802 The initial timestamp must have been obtained via exim_gettime() to avoid
1803 issues on Linux with suspend/resume. */
1805 if (message_id_tv.tv_sec)
1807 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
1808 exim_wait_tick(&message_id_tv, id_resolution);
1811 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1812 ids, and fractions of a second are required. See the comments that precede the
1813 message id creation below.
1814 We use a routine that if possible uses a monotonic clock, and can be used again
1815 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1818 exim_gettime(&message_id_tv);
1820 /* For other uses of the received time we can operate with granularity of one
1821 second, and for that we use the global variable received_time. This is for
1822 things like ultimate message timeouts.
1823 For this we do not care about the Linux suspend/resume problem, so rather than
1824 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1826 gettimeofday(&received_time, NULL);
1828 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1829 happen in the smtp_getc() function when it refills its buffer. */
1831 had_data_timeout = 0;
1833 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1835 /* If not SMTP input, timeout happens only if configured, and we just set a
1836 single timeout for the whole message. */
1838 else if (receive_timeout > 0)
1840 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1841 ALARM(receive_timeout);
1844 /* SIGTERM and SIGINT are caught always. */
1846 had_data_sigint = 0;
1847 signal(SIGTERM, data_sigterm_sigint_handler);
1848 signal(SIGINT, data_sigterm_sigint_handler);
1850 /* Header lines in messages are not supposed to be very long, though when
1851 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1852 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1853 storing the header, and extend this as necessary using string_cat().
1855 To cope with total lunacies, impose an upper limit on the length of the header
1856 section of the message, as otherwise the store will fill up. We must also cope
1857 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1858 Folded header lines are joined into one string, leaving the '\n' characters
1859 inside them, so that writing them out reproduces the input.
1861 Loop for each character of each header; the next structure for chaining the
1862 header is set up already, with ptr the offset of the next character in
1867 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1869 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1870 SMTP must have a correct "." terminator. */
1872 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1874 smtp_reply = handle_lost_connection(US" (header)");
1876 goto TIDYUP; /* Skip to end of function */
1879 /* See if we are at the current header's size limit - there must be at least
1880 four bytes left. This allows for the new character plus a zero, plus two for
1881 extra insertions when we are playing games with dots and carriage returns. If
1882 we are at the limit, extend the text buffer. This could have been done
1883 automatically using string_cat() but because this is a tightish loop storing
1884 only one character at a time, we choose to do it inline. Normally
1885 store_extend() will be able to extend the block; only at the end of a big
1886 store block will a copy be needed. To handle the case of very long headers
1887 (and sometimes lunatic messages can have ones that are 100s of K long) we
1888 call store_release() for strings that have been copied - if the string is at
1889 the start of a block (and therefore the only thing in it, because we aren't
1890 doing any other gets), the block gets freed. We can only do this release if
1891 there were no allocations since the once that we want to free. */
1893 if (ptr >= header_size - 4)
1895 int oldsize = header_size;
1897 if (header_size >= INT_MAX/2)
1901 /* The data came from the message, so is tainted. */
1903 if (!store_extend(next->text, TRUE, oldsize, header_size))
1904 next->text = store_newblock(next->text, TRUE, header_size, ptr);
1907 /* Cope with receiving a binary zero. There is dispute about whether
1908 these should be allowed in RFC 822 messages. The middle view is that they
1909 should not be allowed in headers, at least. Exim takes this attitude at
1910 the moment. We can't just stomp on them here, because we don't know that
1911 this line is a header yet. Set a flag to cause scanning later. */
1913 if (ch == 0) had_zero++;
1915 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1916 those from data files use just LF. Treat LF in local SMTP input as a
1917 terminator too. Treat EOF as a line terminator always. */
1919 if (ch == EOF) goto EOL;
1921 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1922 other MTAs accept this. We are therefore forced into this "liberalisation"
1923 too, so we accept LF as a line terminator whatever the source of the message.
1924 However, if the first line of the message ended with a CRLF, we treat a bare
1925 LF specially by inserting a white space after it to ensure that the header
1926 line is not terminated. */
1930 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1931 else if (first_line_ended_crlf) receive_ungetc(' ');
1935 /* This is not the end of the line. If this is SMTP input and this is
1936 the first character in the line and it is a "." character, ignore it.
1937 This implements the dot-doubling rule, though header lines starting with
1938 dots aren't exactly common. They are legal in RFC 822, though. If the
1939 following is CRLF or LF, this is the line that that terminates the
1940 entire message. We set message_ended to indicate this has happened (to
1941 prevent further reading), and break out of the loop, having freed the
1942 empty header, and set next = NULL to indicate no data line. */
1944 if (ptr == 0 && ch == '.' && f.dot_ends)
1946 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1949 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1953 ch = '\r'; /* Revert to CR */
1958 message_ended = END_DOT;
1959 reset_point = store_reset(reset_point);
1961 break; /* End character-reading loop */
1964 /* For non-SMTP input, the dot at the start of the line was really a data
1965 character. What is now in ch is the following character. We guaranteed
1966 enough space for this above. */
1970 next->text[ptr++] = '.';
1975 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1976 remember this case if this is the first line ending. */
1980 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1983 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1987 /* Otherwise, put back the character after CR, and turn the bare CR
1990 ch = (receive_ungetc)(ch);
1991 next->text[ptr++] = '\n';
1996 /* We have a data character for the header line. */
1998 next->text[ptr++] = ch; /* Add to buffer */
1999 message_size++; /* Total message size so far */
2001 /* Handle failure due to a humungously long header section. The >= allows
2002 for the terminating \n. Add what we have so far onto the headers list so
2003 that it gets reflected in any error message, and back up the just-read
2006 if (message_size >= header_maxsize)
2009 next->text[ptr] = 0;
2011 next->type = htype_other;
2013 header_last->next = next;
2016 log_write(0, LOG_MAIN, "ridiculously long message header received from "
2017 "%s (more than %d characters): message abandoned",
2018 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
2022 smtp_reply = US"552 Message header is ridiculously long";
2023 receive_swallow_smtp();
2024 goto TIDYUP; /* Skip to end of function */
2029 give_local_error(ERRMESS_VLONGHEADER,
2030 string_sprintf("message header longer than %d characters received: "
2031 "message not accepted", header_maxsize), US"", error_rc, stdin,
2033 /* Does not return */
2037 continue; /* With next input character */
2039 /* End of header line reached */
2043 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2045 receive_linecount++;
2046 message_linecount++;
2048 /* Keep track of maximum line length */
2050 if (ptr - prevlines_length > max_received_linelength)
2051 max_received_linelength = ptr - prevlines_length;
2052 prevlines_length = ptr + 1;
2054 /* Now put in the terminating newline. There is always space for
2055 at least two more characters. */
2057 next->text[ptr++] = '\n';
2060 /* A blank line signals the end of the headers; release the unwanted
2061 space and set next to NULL to indicate this. */
2065 reset_point = store_reset(reset_point);
2070 /* There is data in the line; see if the next input character is a
2071 whitespace character. If it is, we have a continuation of this header line.
2072 There is always space for at least one character at this point. */
2076 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2077 if (nextch == ' ' || nextch == '\t')
2079 next->text[ptr++] = nextch;
2080 if (++message_size >= header_maxsize)
2082 continue; /* Iterate the loop */
2084 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2085 else ch = EOF; /* Cause main loop to exit at end */
2088 /* We have got to the real line end. Terminate the string and release store
2089 beyond it. If it turns out to be a real header, internal binary zeros will
2090 be squashed later. */
2092 next->text[ptr] = 0;
2094 store_release_above(next->text + ptr + 1);
2096 /* Check the running total size against the overall message size limit. We
2097 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2098 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2099 headers - the code to read the body will then also hit the buffer. */
2101 if (message_size > thismessage_size_limit) break;
2103 /* A line that is not syntactically correct for a header also marks
2104 the end of the headers. In this case, we leave next containing the
2105 first data line. This might actually be several lines because of the
2106 continuation logic applied above, but that doesn't matter.
2108 It turns out that smail, and presumably sendmail, accept leading lines
2111 From ph10 Fri Jan 5 12:35 GMT 1996
2113 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2114 find any documentation of this, but for compatibility it had better be
2115 accepted. Exim restricts it to the case of non-smtp messages, and
2116 treats it as an alternative to the -f command line option. Thus it is
2117 ignored except for trusted users or filter testing. Otherwise it is taken
2118 as the sender address, unless -f was used (sendmail compatibility).
2120 It further turns out that some UUCPs generate the From_line in a different
2123 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2125 The regex for matching these things is now capable of recognizing both
2126 formats (including 2- and 4-digit years in the latter). In fact, the regex
2127 is now configurable, as is the expansion string to fish out the sender.
2129 Even further on it has been discovered that some broken clients send
2130 these lines in SMTP messages. There is now an option to ignore them from
2131 specified hosts or networks. Sigh. */
2133 if ( header_last == header_list
2135 || ( sender_host_address
2136 && verify_check_host(&ignore_fromline_hosts) == OK
2138 || (!sender_host_address && ignore_fromline_local)
2140 && regex_match_and_setup(regex_From, next->text, 0, -1)
2143 if (!f.sender_address_forced)
2145 uschar *uucp_sender = expand_string(uucp_from_sender);
2147 log_write(0, LOG_MAIN|LOG_PANIC,
2148 "expansion of \"%s\" failed after matching "
2149 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2152 int start, end, domain;
2154 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2155 &start, &end, &domain, TRUE);
2158 if (domain == 0 && newsender[0] != 0)
2159 /* deconst ok as newsender was not const */
2160 newsender = US rewrite_address_qualify(newsender, FALSE);
2162 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2164 sender_address = newsender;
2166 if (f.trusted_caller || filter_test != FTEST_NONE)
2168 authenticated_sender = NULL;
2169 originator_name = US"";
2170 f.sender_local = FALSE;
2173 if (filter_test != FTEST_NONE)
2174 printf("Sender taken from \"From \" line\n");
2181 /* Not a leading "From " line. Check to see if it is a valid header line.
2182 Header names may contain any non-control characters except space and colon,
2187 uschar *p = next->text;
2189 /* If not a valid header line, break from the header reading loop, leaving
2190 next != NULL, indicating that it holds the first line of the body. */
2192 if (isspace(*p)) break;
2193 while (mac_isgraph(*p) && *p != ':') p++;
2194 while (isspace(*p)) p++;
2197 body_zerocount = had_zero;
2201 /* We have a valid header line. If there were any binary zeroes in
2202 the line, stomp on them here. */
2205 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2208 /* It is perfectly legal to have an empty continuation line
2209 at the end of a header, but it is confusing to humans
2210 looking at such messages, since it looks like a blank line.
2211 Reduce confusion by removing redundant white space at the
2212 end. We know that there is at least one printing character
2213 (the ':' tested for above) so there is no danger of running
2216 p = next->text + ptr - 2;
2219 while (*p == ' ' || *p == '\t') p--;
2220 if (*p != '\n') break;
2221 ptr = (p--) - next->text + 1;
2222 message_size -= next->slen - ptr;
2223 next->text[ptr] = 0;
2227 /* Add the header to the chain */
2229 next->type = htype_other;
2231 header_last->next = next;
2234 /* Check the limit for individual line lengths. This comes after adding to
2235 the chain so that the failing line is reflected if a bounce is generated
2236 (for a local message). */
2238 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2240 log_write(0, LOG_MAIN, "overlong message header line received from "
2241 "%s (more than %d characters): message abandoned",
2242 f.sender_host_unknown ? sender_ident : sender_fullhost,
2243 header_line_maxsize);
2247 smtp_reply = US"552 A message header line is too long";
2248 receive_swallow_smtp();
2249 goto TIDYUP; /* Skip to end of function */
2253 give_local_error(ERRMESS_VLONGHDRLINE,
2254 string_sprintf("message header line longer than %d characters "
2255 "received: message not accepted", header_line_maxsize), US"",
2256 error_rc, stdin, header_list->next);
2257 /* Does not return */
2260 /* Note if any resent- fields exist. */
2262 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2264 resents_exist = TRUE;
2265 resent_prefix = US"Resent-";
2269 /* Reject CHUNKING messages that do not CRLF their first header line */
2271 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2273 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2274 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2276 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2277 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2278 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2281 goto TIDYUP; /* Skip to end of function */
2284 /* The line has been handled. If we have hit EOF, break out of the loop,
2285 indicating no pending data line. */
2287 if (ch == EOF) { next = NULL; break; }
2289 /* Set up for the next header */
2291 reset_point = store_mark();
2293 next = store_get(sizeof(header_line), FALSE);
2294 next->text = store_get(header_size, TRUE);
2297 prevlines_length = 0;
2298 } /* Continue, starting to read the next header */
2300 /* At this point, we have read all the headers into a data structure in main
2301 store. The first header is still the dummy placeholder for the Received: header
2302 we are going to generate a bit later on. If next != NULL, it contains the first
2303 data line - which terminated the headers before reaching a blank line (not the
2308 debug_printf(">>Headers received:\n");
2309 for (header_line * h = header_list->next; h; h = h->next)
2310 debug_printf("%s", h->text);
2314 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2315 is dropped immediately after valid headers, the next thing we will see is EOF.
2316 We must test for this specially, as further down the reading of the data is
2317 skipped if already at EOF. */
2319 if (smtp_input && (receive_feof)())
2321 smtp_reply = handle_lost_connection(US" (after header)");
2323 goto TIDYUP; /* Skip to end of function */
2326 /* If this is a filter test run and no headers were read, output a warning
2327 in case there is a mistake in the test message. */
2329 if (filter_test != FTEST_NONE && header_list->next == NULL)
2330 printf("Warning: no message headers read\n");
2333 /* Scan the headers to identify them. Some are merely marked for later
2334 processing; some are dealt with here. */
2336 for (header_line * h = header_list->next; h; h = h->next)
2338 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2339 if (is_resent) contains_resent_headers = TRUE;
2341 switch (header_checkname(h, is_resent))
2344 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2348 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2351 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2354 if (!resents_exist || is_resent) date_header_exists = TRUE;
2357 /* Same comments as about Return-Path: below. */
2359 case htype_delivery_date:
2360 if (delivery_date_remove) h->type = htype_old;
2363 /* Same comments as about Return-Path: below. */
2365 case htype_envelope_to:
2366 if (envelope_to_remove) h->type = htype_old;
2369 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2370 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2371 header consists of just the login id of the user who called Exim, rewrite
2372 it with the gecos field first. Apply this rule to Resent-From: if there
2373 are resent- fields. */
2376 h->type = htype_from;
2377 if (!resents_exist || is_resent)
2383 uschar *s = Ustrchr(h->text, ':') + 1;
2384 while (isspace(*s)) s++;
2385 len = h->slen - (s - h->text) - 1;
2386 if (Ustrlen(originator_login) == len &&
2387 strncmpic(s, originator_login, len) == 0)
2389 uschar *name = is_resent? US"Resent-From" : US"From";
2390 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2391 originator_login, qualify_domain_sender);
2392 from_header = header_last;
2393 h->type = htype_old;
2394 DEBUG(D_receive|D_rewrite)
2395 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2401 /* Identify the Message-id: header for generating "in-reply-to" in the
2402 autoreply transport. For incoming logging, save any resent- value. In both
2403 cases, take just the first of any multiples. */
2406 if (!msgid_header && (!resents_exist || is_resent))
2413 /* Flag all Received: headers */
2415 case htype_received:
2416 h->type = htype_received;
2420 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2422 case htype_reply_to:
2423 h->type = htype_reply_to;
2426 /* The Return-path: header is supposed to be added to messages when
2427 they leave the SMTP system. We shouldn't receive messages that already
2428 contain Return-path. However, since Exim generates Return-path: on
2429 local delivery, resent messages may well contain it. We therefore
2430 provide an option (which defaults on) to remove any Return-path: headers
2431 on input. Removal actually means flagging as "old", which prevents the
2432 header being transmitted with the message. */
2434 case htype_return_path:
2435 if (return_path_remove) h->type = htype_old;
2437 /* If we are testing a mail filter file, use the value of the
2438 Return-Path: header to set up the return_path variable, which is not
2439 otherwise set. However, remove any <> that surround the address
2440 because the variable doesn't have these. */
2442 if (filter_test != FTEST_NONE)
2444 uschar *start = h->text + 12;
2445 uschar *end = start + Ustrlen(start);
2446 while (isspace(*start)) start++;
2447 while (end > start && isspace(end[-1])) end--;
2448 if (*start == '<' && end[-1] == '>')
2453 return_path = string_copyn(start, end - start);
2454 printf("Return-path taken from \"Return-path:\" header line\n");
2458 /* If there is a "Sender:" header and the message is locally originated,
2459 and from an untrusted caller and suppress_local_fixups is not set, or if we
2460 are in submission mode for a remote message, mark it "old" so that it will
2461 not be transmitted with the message, unless active_local_sender_retain is
2462 set. (This can only be true if active_local_from_check is false.) If there
2463 are any resent- headers in the message, apply this rule to Resent-Sender:
2464 instead of Sender:. Messages with multiple resent- header sets cannot be
2465 tidily handled. (For this reason, at least one MUA - Pine - turns old
2466 resent- headers into X-resent- headers when resending, leaving just one
2470 h->type = !f.active_local_sender_retain
2471 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2472 || f.submission_mode
2474 && (!resents_exist || is_resent)
2475 ? htype_old : htype_sender;
2478 /* Remember the Subject: header for logging. There is no Resent-Subject */
2484 /* "To:" gets flagged, and the existence of a recipient header is noted,
2485 whether it's resent- or not. */
2490 to_or_cc_header_exists = TRUE;
2496 /* Extract recipients from the headers if that is required (the -t option).
2497 Note that this is documented as being done *before* any address rewriting takes
2498 place. There are two possibilities:
2500 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2501 recipients already listed are to be REMOVED from the message. Smail 3 works
2502 like this. We need to build a non-recipients tree for that list, because in
2503 subsequent processing this data is held in a tree and that's what the
2504 spool_write_header() function expects. Make sure that non-recipient addresses
2505 are fully qualified and rewritten if necessary.
2507 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2508 those in the command line arguments (and it is rumoured some other MTAs do
2509 this). Therefore, there is an option to make Exim behave this way.
2511 *** Notes on "Resent-" header lines ***
2513 The presence of resent-headers in the message makes -t horribly ambiguous.
2514 Experiments with sendmail showed that it uses recipients for all resent-
2515 headers, totally ignoring the concept of "sets of resent- headers" as described
2516 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2517 with all the addresses in one instance of each header.
2519 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2520 error for -t if there were resent- headers in the message. However, after a
2521 discussion on the mailing list, I've learned that there are MUAs that use
2522 resent- headers with -t, and also that the stuff about sets of resent- headers
2523 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2524 message with -t and resent- header lines makes sure that only *its* resent-
2525 headers are present; previous ones are often renamed as X-resent- for example.
2527 Consequently, Exim has been changed so that, if any resent- header lines are
2528 present, the recipients are taken from all of the appropriate resent- lines,
2529 and not from the ordinary To:, Cc:, etc. */
2534 error_block **bnext = &bad_addresses;
2536 if (extract_addresses_remove_arguments)
2538 while (recipients_count-- > 0)
2540 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2541 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2542 tree_add_nonrecipient(s);
2544 recipients_list = NULL;
2545 recipients_count = recipients_list_max = 0;
2548 /* Now scan the headers */
2550 for (header_line * h = header_list->next; h; h = h->next)
2552 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2553 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2555 uschar *s = Ustrchr(h->text, ':') + 1;
2556 while (isspace(*s)) s++;
2558 f.parse_allow_group = TRUE; /* Allow address group syntax */
2562 uschar *ss = parse_find_address_end(s, FALSE);
2563 uschar *recipient, *errmess, *pp;
2564 int start, end, domain;
2566 /* Check on maximum */
2568 if (recipients_max > 0 && ++rcount > recipients_max)
2569 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2570 US"message rejected: ", error_rc, stdin, NULL);
2571 /* Does not return */
2573 /* Make a copy of the address, and remove any internal newlines. These
2574 may be present as a result of continuations of the header line. The
2575 white space that follows the newline must not be removed - it is part
2578 pp = recipient = store_get(ss - s + 1, is_tainted(s));
2579 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2584 BOOL b = allow_utf8_domains;
2585 allow_utf8_domains = TRUE;
2587 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2592 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2593 else allow_utf8_domains = b;
2599 /* Keep a list of all the bad addresses so we can send a single
2600 error message at the end. However, an empty address is not an error;
2601 just ignore it. This can come from an empty group list like
2603 To: Recipients of list:;
2605 If there are no recipients at all, an error will occur later. */
2607 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2609 int len = Ustrlen(s);
2610 error_block *b = store_get(sizeof(error_block), FALSE);
2611 while (len > 0 && isspace(s[len-1])) len--;
2613 b->text1 = string_printing(string_copyn(s, len));
2619 /* If the recipient is already in the nonrecipients tree, it must
2620 have appeared on the command line with the option extract_addresses_
2621 remove_arguments set. Do not add it to the recipients, and keep a note
2622 that this has happened, in order to give a better error if there are
2623 no recipients left. */
2625 else if (recipient != NULL)
2627 if (tree_search(tree_nonrecipients, recipient) == NULL)
2628 receive_add_recipient(recipient, -1);
2630 extracted_ignored = TRUE;
2633 /* Move on past this address */
2635 s = ss + (*ss? 1:0);
2636 while (isspace(*s)) s++;
2637 } /* Next address */
2639 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2640 f.parse_found_group = FALSE;
2642 /* If this was the bcc: header, mark it "old", which means it
2643 will be kept on the spool, but not transmitted as part of the
2646 if (h->type == htype_bcc) h->type = htype_old;
2647 } /* For appropriate header line */
2648 } /* For each header line */
2652 /* Now build the unique message id. This has changed several times over the
2653 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2654 Retaining all the history in the comment has become too unwieldy - read
2655 previous release sources if you want it.
2657 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2658 The first part is the current time, in seconds. The second part is the current
2659 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2660 can hold a number in the range 0-3843. It used to be a computed sequence
2661 number, but is now the fractional component of the current time in units of
2662 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2663 received, Exim ensures that the timer has ticked at the appropriate level
2664 before proceeding, to avoid duplication if the pid happened to be re-used
2665 within the same time period. It seems likely that most messages will take at
2666 least half a millisecond to be received, so no delay will normally be
2667 necessary. At least for some time...
2669 There is a modification when localhost_number is set. Formerly this was allowed
2670 to be as large as 255. Now it is restricted to the range 0-16, and the final
2671 component of the message id becomes (localhost_number * 200) + fractional time
2672 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2674 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2675 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2676 still allows the tttttt field to hold a large enough number to last for some
2677 more decades, and the final two-digit field can hold numbers up to 1295, which
2678 is enough for milliseconds (instead of 1/2000 of a second).
2680 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2681 pid, so it is probably safe because pids have to be positive. The
2682 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2683 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2685 Note that string_base62() returns its data in a static storage block, so it
2686 must be copied before calling string_base62() again. It always returns exactly
2689 There doesn't seem to be anything in the RFC which requires a message id to
2690 start with a letter, but Smail was changed to ensure this. The external form of
2691 the message id (as supplied by string expansion) therefore starts with an
2692 additional leading 'E'. The spool file names do not include this leading
2693 letter and it is not used internally.
2695 NOTE: If ever the format of message ids is changed, the regular expression for
2696 checking that a string is in this format must be updated in a corresponding
2697 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2698 must also be changed to reflect the correct string length. The queue-sort code
2699 needs to know the layout. Then, of course, other programs that rely on the
2700 message id format will need updating too. */
2702 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2703 message_id[6] = '-';
2704 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2706 /* Deal with the case where the host number is set. The value of the number was
2707 checked when it was read, to ensure it isn't too big. */
2709 if (host_number_string)
2710 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2711 string_base62((long int)(
2712 host_number * (1000000/id_resolution) +
2713 message_id_tv.tv_usec/id_resolution)) + 4);
2715 /* Host number not set: final field is just the fractional time at an
2716 appropriate resolution. */
2719 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2720 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2722 /* Add the current message id onto the current process info string if
2725 (void)string_format(process_info + process_info_len,
2726 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2728 /* If we are using multiple input directories, set up the one for this message
2729 to be the least significant base-62 digit of the time of arrival. Otherwise
2730 ensure that it is an empty string. */
2732 set_subdir_str(message_subdir, message_id, 0);
2734 /* Now that we have the message-id, if there is no message-id: header, generate
2735 one, but only for local (without suppress_local_fixups) or submission mode
2736 messages. This can be user-configured if required, but we had better flatten
2737 any illegal characters therein. */
2740 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2742 uschar *id_text = US"";
2743 uschar *id_domain = primary_hostname;
2746 /* Permit only letters, digits, dots, and hyphens in the domain */
2748 if (message_id_domain)
2750 uschar *new_id_domain = expand_string(message_id_domain);
2753 if (!f.expand_string_forcedfail)
2754 log_write(0, LOG_MAIN|LOG_PANIC,
2755 "expansion of \"%s\" (message_id_header_domain) "
2756 "failed: %s", message_id_domain, expand_string_message);
2758 else if (*new_id_domain)
2760 id_domain = new_id_domain;
2761 for (uschar * p = id_domain; *p; p++)
2762 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2766 /* Permit all characters except controls and RFC 2822 specials in the
2767 additional text part. */
2769 if (message_id_text)
2771 uschar *new_id_text = expand_string(message_id_text);
2774 if (!f.expand_string_forcedfail)
2775 log_write(0, LOG_MAIN|LOG_PANIC,
2776 "expansion of \"%s\" (message_id_header_text) "
2777 "failed: %s", message_id_text, expand_string_message);
2779 else if (*new_id_text)
2781 id_text = new_id_text;
2782 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2786 /* Add the header line.
2787 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2788 appended, to preserve classical expectations of header ordering. */
2790 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2791 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2792 *id_text == 0 ? "" : ".", id_text, id_domain);
2794 /* Arrange for newly-created Message-Id to be logged */
2798 msgid_header_newly_created = TRUE;
2803 /* If we are to log recipients, keep a copy of the raw ones before any possible
2804 rewriting. Must copy the count, because later ACLs and the local_scan()
2805 function may mess with the real recipients. */
2807 if (LOGGING(received_recipients))
2809 raw_recipients = store_get(recipients_count * sizeof(uschar *), FALSE);
2810 for (int i = 0; i < recipients_count; i++)
2811 raw_recipients[i] = string_copy(recipients_list[i].address);
2812 raw_recipients_count = recipients_count;
2815 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2816 recipients will get here only if the conditions were right (allow_unqualified_
2817 recipient is TRUE). */
2819 for (int i = 0; i < recipients_count; i++)
2820 recipients_list[i].address = /* deconst ok as src was not cont */
2821 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2822 global_rewrite_rules, rewrite_existflags);
2824 /* If there is no From: header, generate one for local (without
2825 suppress_local_fixups) or submission_mode messages. If there is no sender
2826 address, but the sender is local or this is a local delivery error, use the
2827 originator login. This shouldn't happen for genuine bounces, but might happen
2828 for autoreplies. The addition of From: must be done *before* checking for the
2829 possible addition of a Sender: header, because untrusted_set_sender allows an
2830 untrusted user to set anything in the envelope (which might then get info
2831 From:) but we still want to ensure a valid Sender: if it is required. */
2834 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2836 const uschar * oname = US"";
2838 /* Use the originator_name if this is a locally submitted message and the
2839 caller is not trusted. For trusted callers, use it only if -F was used to
2840 force its value or if we have a non-SMTP message for which -f was not used
2841 to set the sender. */
2843 if (!sender_host_address)
2845 if (!f.trusted_caller || f.sender_name_forced ||
2846 (!smtp_input && !f.sender_address_forced))
2847 oname = originator_name;
2850 /* For non-locally submitted messages, the only time we use the originator
2851 name is when it was forced by the /name= option on control=submission. */
2853 else if (submission_name) oname = submission_name;
2855 /* Envelope sender is empty */
2857 if (!*sender_address)
2859 uschar *fromstart, *fromend;
2861 fromstart = string_sprintf("%sFrom: %s%s",
2862 resent_prefix, oname, *oname ? " <" : "");
2863 fromend = *oname ? US">" : US"";
2865 if (f.sender_local || f.local_error_message)
2866 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2867 local_part_quote(originator_login), qualify_domain_sender,
2870 else if (f.submission_mode && authenticated_id)
2872 if (!submission_domain)
2873 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2874 local_part_quote(authenticated_id), qualify_domain_sender,
2877 else if (!*submission_domain) /* empty => whole address set */
2878 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2882 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2883 local_part_quote(authenticated_id), submission_domain, fromend);
2885 from_header = header_last; /* To get it checked for Sender: */
2889 /* There is a non-null envelope sender. Build the header using the original
2890 sender address, before any rewriting that might have been done while
2895 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2898 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2901 from_header = header_last; /* To get it checked for Sender: */
2906 /* If the sender is local (without suppress_local_fixups), or if we are in
2907 submission mode and there is an authenticated_id, check that an existing From:
2908 is correct, and if not, generate a Sender: header, unless disabled. Any
2909 previously-existing Sender: header was removed above. Note that sender_local,
2910 as well as being TRUE if the caller of exim is not trusted, is also true if a
2911 trusted caller did not supply a -f argument for non-smtp input. To allow
2912 trusted callers to forge From: without supplying -f, we have to test explicitly
2913 here. If the From: header contains more than one address, then the call to
2914 parse_extract_address fails, and a Sender: header is inserted, as required. */
2917 && ( f.active_local_from_check
2918 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2919 || f.submission_mode && authenticated_id
2922 BOOL make_sender = TRUE;
2923 int start, end, domain;
2925 uschar *from_address =
2926 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2927 &start, &end, &domain, FALSE);
2928 uschar *generated_sender_address;
2930 generated_sender_address = f.submission_mode
2931 ? !submission_domain
2932 ? string_sprintf("%s@%s",
2933 local_part_quote(authenticated_id), qualify_domain_sender)
2934 : !*submission_domain /* empty => full address */
2935 ? string_sprintf("%s", authenticated_id)
2936 : string_sprintf("%s@%s",
2937 local_part_quote(authenticated_id), submission_domain)
2938 : string_sprintf("%s@%s",
2939 local_part_quote(originator_login), qualify_domain_sender);
2941 /* Remove permitted prefixes and suffixes from the local part of the From:
2942 address before doing the comparison with the generated sender. */
2947 uschar *at = domain ? from_address + domain - 1 : NULL;
2950 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2951 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2953 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2954 from_address += slen;
2958 if ( strcmpic(generated_sender_address, from_address) == 0
2959 || (!domain && strcmpic(from_address, originator_login) == 0))
2960 make_sender = FALSE;
2963 /* We have to cause the Sender header to be rewritten if there are
2964 appropriate rewriting rules. */
2967 if (f.submission_mode && !submission_name)
2968 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2969 generated_sender_address);
2971 header_add(htype_sender, "%sSender: %s <%s>\n",
2973 f.submission_mode ? submission_name : originator_name,
2974 generated_sender_address);
2976 /* Ensure that a non-null envelope sender address corresponds to the
2977 submission mode sender address. */
2979 if (f.submission_mode && *sender_address)
2981 if (!sender_address_unrewritten)
2982 sender_address_unrewritten = sender_address;
2983 sender_address = generated_sender_address;
2984 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2985 log_write(L_address_rewrite, LOG_MAIN,
2986 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2987 sender_address_unrewritten, generated_sender_address);
2991 /* If there are any rewriting rules, apply them to the sender address, unless
2992 it has already been rewritten as part of verification for SMTP input. */
2994 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2996 /* deconst ok as src was not const */
2997 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
2998 global_rewrite_rules, rewrite_existflags);
2999 DEBUG(D_receive|D_rewrite)
3000 debug_printf("rewritten sender = %s\n", sender_address);
3004 /* The headers must be run through rewrite_header(), because it ensures that
3005 addresses are fully qualified, as well as applying any rewriting rules that may
3008 Qualification of header addresses in a message from a remote host happens only
3009 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
3010 appropriate. For local messages, qualification always happens, unless -bnq is
3011 used to explicitly suppress it. No rewriting is done for an unqualified address
3012 that is left untouched.
3014 We start at the second header, skipping our own Received:. This rewriting is
3015 documented as happening *after* recipient addresses are taken from the headers
3016 by the -t command line option. An added Sender: gets rewritten here. */
3018 for (header_line * h = header_list->next; h; h = h->next)
3020 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3021 rewrite_existflags, TRUE);
3026 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3027 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3028 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3029 exists, this applies to the set of resent- headers rather than the normal set.
3031 The requirement for a recipient header has been removed in RFC 2822. At this
3032 point in the code, earlier versions of Exim added a To: header for locally
3033 submitted messages, and an empty Bcc: header for others. In the light of the
3034 changes in RFC 2822, this was dropped in November 2003. */
3037 /* If there is no date header, generate one if the message originates locally
3038 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3039 submission mode flag is set. Messages without Date: are not valid, but it seems
3040 to be more confusing if Exim adds one to all remotely-originated messages.
3041 As per Message-Id, we prepend if resending, else append.
3044 if ( !date_header_exists
3045 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3046 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3047 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3049 search_tidyup(); /* Free any cached resources */
3051 /* Show the complete set of headers if debugging. Note that the first one (the
3052 new Received:) has not yet been set. */
3056 debug_printf(">>Headers after rewriting and local additions:\n");
3057 for (header_line * h = header_list->next; h; h = h->next)
3058 debug_printf("%c %s", h->type, h->text);
3062 /* The headers are now complete in store. If we are running in filter
3063 testing mode, that is all this function does. Return TRUE if the message
3064 ended with a dot. */
3066 if (filter_test != FTEST_NONE)
3068 process_info[process_info_len] = 0;
3069 return message_ended == END_DOT;
3072 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3073 think more if it could be handled. Cannot do onward CHUNKING unless
3074 inbound is, but inbound chunking ought to be ok with outbound plain.
3075 Could we do onward CHUNKING given inbound CHUNKING?
3077 if (chunking_state > CHUNKING_OFFERED)
3078 cancel_cutthrough_connection(FALSE, US"chunking active");
3080 /* Cutthrough delivery:
3081 We have to create the Received header now rather than at the end of reception,
3082 so the timestamp behaviour is a change to the normal case.
3083 Having created it, send the headers to the destination. */
3085 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3087 if (received_count > received_headers_max)
3089 cancel_cutthrough_connection(TRUE, US"too many headers");
3090 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3091 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3092 "Too many \"Received\" headers",
3094 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3095 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3096 message_id[0] = 0; /* Indicate no message accepted */
3097 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3098 goto TIDYUP; /* Skip to end of function */
3100 received_header_gen();
3101 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3102 (void) cutthrough_headers_send();
3106 /* Open a new spool file for the data portion of the message. We need
3107 to access it both via a file descriptor and a stream. Try to make the
3108 directory if it isn't there. */
3110 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3111 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3113 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3115 if (errno == ENOENT)
3117 (void) directory_make(spool_directory,
3118 spool_sname(US"input", message_subdir),
3119 INPUT_DIRECTORY_MODE, TRUE);
3120 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3123 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3124 spool_name, strerror(errno));
3127 /* Make sure the file's group is the Exim gid, and double-check the mode
3128 because the group setting doesn't always get set automatically. */
3130 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3131 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3132 "Failed setting ownership on spool file %s: %s",
3133 spool_name, strerror(errno));
3134 (void)fchmod(data_fd, SPOOL_MODE);
3136 /* We now have data file open. Build a stream for it and lock it. We lock only
3137 the first line of the file (containing the message ID) because otherwise there
3138 are problems when Exim is run under Cygwin (I'm told). See comments in
3139 spool_in.c, where the same locking is done. */
3141 spool_data_file = fdopen(data_fd, "w+");
3142 lock_data.l_type = F_WRLCK;
3143 lock_data.l_whence = SEEK_SET;
3144 lock_data.l_start = 0;
3145 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3147 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3148 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3149 errno, strerror(errno));
3151 /* We have an open, locked data file. Write the message id to it to make it
3152 self-identifying. Then read the remainder of the input of this message and
3153 write it to the data file. If the variable next != NULL, it contains the first
3154 data line (which was read as a header but then turned out not to have the right
3155 format); write it (remembering that it might contain binary zeros). The result
3156 of fwrite() isn't inspected; instead we call ferror() below. */
3158 fprintf(spool_data_file, "%s-D\n", message_id);
3161 uschar *s = next->text;
3162 int len = next->slen;
3163 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3164 body_linecount++; /* Assumes only 1 line */
3167 /* Note that we might already be at end of file, or the logical end of file
3168 (indicated by '.'), or might have encountered an error while writing the
3169 message id or "next" line. */
3171 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3175 message_ended = chunking_state <= CHUNKING_OFFERED
3176 ? read_message_data_smtp(spool_data_file)
3178 ? read_message_bdat_smtp_wire(spool_data_file)
3179 : read_message_bdat_smtp(spool_data_file);
3180 receive_linecount++; /* The terminating "." line */
3183 message_ended = read_message_data(spool_data_file);
3185 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3186 message_linecount += body_linecount;
3188 switch (message_ended)
3190 /* Handle premature termination of SMTP */
3195 Uunlink(spool_name); /* Lose data file when closed */
3196 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3197 message_id[0] = 0; /* Indicate no message accepted */
3198 smtp_reply = handle_lost_connection(US"");
3200 goto TIDYUP; /* Skip to end of function */
3204 /* Handle message that is too big. Don't use host_or_ident() in the log
3205 message; we want to see the ident value even for non-remote messages. */
3208 Uunlink(spool_name); /* Lose the data file when closed */
3209 cancel_cutthrough_connection(TRUE, US"mail too big");
3210 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3212 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3213 "message too big: read=%d max=%d",
3215 sender_fullhost ? " H=" : "",
3216 sender_fullhost ? sender_fullhost : US"",
3217 sender_ident ? " U=" : "",
3218 sender_ident ? sender_ident : US"",
3220 thismessage_size_limit);
3224 smtp_reply = US"552 Message size exceeds maximum permitted";
3225 message_id[0] = 0; /* Indicate no message accepted */
3226 goto TIDYUP; /* Skip to end of function */
3230 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3231 give_local_error(ERRMESS_TOOBIG,
3232 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3233 US"message rejected: ", error_rc, spool_data_file, header_list);
3234 /* Does not return */
3238 /* Handle bad BDAT protocol sequence */
3241 Uunlink(spool_name); /* Lose the data file when closed */
3242 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3243 smtp_reply = US""; /* Response already sent */
3244 message_id[0] = 0; /* Indicate no message accepted */
3245 goto TIDYUP; /* Skip to end of function */
3249 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3250 example, there may be some expansion in an ACL that uses a timer.) */
3252 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3254 /* The message body has now been read into the data file. Call fflush() to
3255 empty the buffers in C, and then call fsync() to get the data written out onto
3256 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3257 having to do this). If there was an I/O error on either input or output,
3258 attempt to send an error message, and unlink the spool file. For non-SMTP input
3259 we can then give up. Note that for SMTP input we must swallow the remainder of
3260 the input in cases of output errors, since the far end doesn't expect to see
3261 anything until the terminating dot line is sent. */
3263 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3264 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3266 uschar *msg_errno = US strerror(errno);
3267 BOOL input_error = (receive_ferror)() != 0;
3268 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3269 input_error? "Input read" : "Spool write",
3271 sender_fullhost ? sender_fullhost : sender_ident);
3273 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3274 Uunlink(spool_name); /* Lose the data file */
3275 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3280 smtp_reply = US"451 Error while reading input data";
3283 smtp_reply = US"451 Error while writing spool file";
3284 receive_swallow_smtp();
3286 message_id[0] = 0; /* Indicate no message accepted */
3287 goto TIDYUP; /* Skip to end of function */
3292 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3293 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3295 /* Does not return */
3300 /* No I/O errors were encountered while writing the data file. */
3302 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3303 gettimeofday(&received_time_complete, NULL);
3306 /* If there were any bad addresses extracted by -t, or there were no recipients
3307 left after -t, send a message to the sender of this message, or write it to
3308 stderr if the error handling option is set that way. Note that there may
3309 legitimately be no recipients for an SMTP message if they have all been removed
3312 We need to rewind the data file in order to read it. In the case of no
3313 recipients or stderr error writing, throw the data file away afterwards, and
3314 exit. (This can't be SMTP, which always ensures there's at least one
3315 syntactically good recipient address.) */
3317 if (extract_recip && (bad_addresses || recipients_count == 0))
3321 if (recipients_count == 0) debug_printf("*** No recipients\n");
3324 debug_printf("*** Bad address(es)\n");
3325 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3326 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3330 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3331 message_id, bad_addresses ? "bad addresses" : "no recipients");
3333 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3335 /* If configured to send errors to the sender, but this fails, force
3336 a failure error code. We use a special one for no recipients so that it
3337 can be detected by the autoreply transport. Otherwise error_rc is set to
3338 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3339 it is EXIT_SUCCESS. */
3341 if (error_handling == ERRORS_SENDER)
3343 if (!moan_to_sender(
3345 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3346 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3347 bad_addresses, header_list, spool_data_file, FALSE
3349 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3354 if (extracted_ignored)
3355 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3357 fprintf(stderr, "exim: no recipients in message\n");
3360 fprintf(stderr, "exim: invalid address%s",
3361 bad_addresses->next ? "es:\n" : ":");
3362 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3363 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3364 bad_addresses->text2);
3368 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3370 Uunlink(spool_name);
3371 (void)fclose(spool_data_file);
3372 exim_exit(error_rc);
3376 /* Data file successfully written. Generate text for the Received: header by
3377 expanding the configured string, and adding a timestamp. By leaving this
3378 operation till now, we ensure that the timestamp is the time that message
3379 reception was completed. However, this is deliberately done before calling the
3380 data ACL and local_scan().
3382 This Received: header may therefore be inspected by the data ACL and by code in
3383 the local_scan() function. When they have run, we update the timestamp to be
3384 the final time of reception.
3386 If there is just one recipient, set up its value in the $received_for variable
3387 for use when we generate the Received: header.
3389 Note: the checking for too many Received: headers is handled by the delivery
3391 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3393 if (!received_header->text) /* Non-cutthrough case */
3395 received_header_gen();
3397 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3399 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3400 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3402 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3403 now, before running the DATA ACL. */
3405 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3408 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3409 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3411 /* If an ACL is specified for checking things at this stage of reception of a
3412 message, run it, unless all the recipients were removed by "discard" in earlier
3413 ACLs. That is the only case in which recipients_count can be zero at this
3414 stage. Set deliver_datafile to point to the data file so that $message_body and
3415 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3418 deliver_datafile = data_fd;
3421 f.enable_dollar_recipients = TRUE;
3423 if (recipients_count == 0)
3424 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3428 /* Handle interactive SMTP messages */
3430 if (smtp_input && !smtp_batched_input)
3433 #ifndef DISABLE_DKIM
3434 if (!f.dkim_disable_verify)
3436 /* Finish verification */
3437 dkim_exim_verify_finish();
3439 /* Check if we must run the DKIM ACL */
3440 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3442 uschar * dkim_verify_signers_expanded =
3443 expand_string(dkim_verify_signers);
3444 gstring * results = NULL;
3448 gstring * seen_items = NULL;
3449 int old_pool = store_pool;
3451 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3453 if (!(ptr = dkim_verify_signers_expanded))
3454 log_write(0, LOG_MAIN|LOG_PANIC,
3455 "expansion of dkim_verify_signers option failed: %s",
3456 expand_string_message);
3458 /* Default to OK when no items are present */
3460 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3462 /* Prevent running ACL for an empty item */
3463 if (!item || !*item) continue;
3465 /* Only run ACL once for each domain or identity,
3466 no matter how often it appears in the expanded list. */
3470 const uschar * seen_items_list = string_from_gstring(seen_items);
3472 BOOL seen_this_item = FALSE;
3474 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3476 if (Ustrcmp(seen_item,item) == 0)
3478 seen_this_item = TRUE;
3485 debug_printf("acl_smtp_dkim: skipping signer %s, "
3486 "already seen\n", item);
3490 seen_items = string_catn(seen_items, US":", 1);
3492 seen_items = string_cat(seen_items, item);
3494 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3498 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3499 "skipping remaining items\n", rc, item);
3500 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3504 dkim_verify_status = string_from_gstring(results);
3505 store_pool = old_pool;
3506 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3509 recipients_count = 0;
3510 blackholed_by = US"DKIM ACL";
3512 blackhole_log_msg = string_sprintf(": %s", log_msg);
3516 Uunlink(spool_name);
3517 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3518 smtp_yield = FALSE; /* No more messages after dropped connection */
3519 smtp_reply = US""; /* Indicate reply already sent */
3520 message_id[0] = 0; /* Indicate no message accepted */
3521 goto TIDYUP; /* Skip to end of function */
3525 dkim_exim_verify_log_all();
3527 #endif /* DISABLE_DKIM */
3529 #ifdef WITH_CONTENT_SCAN
3530 if ( recipients_count > 0
3532 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3535 #endif /* WITH_CONTENT_SCAN */
3537 #ifdef SUPPORT_DMARC
3538 dmarc_store_data(from_header);
3541 #ifndef DISABLE_PRDR
3542 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3545 int all_fail = FAIL;
3547 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3548 /* Loop through recipients, responses must be in same order received */
3549 for (unsigned int c = 0; recipients_count > c; c++)
3551 uschar * addr= recipients_list[c].address;
3552 uschar * msg= US"PRDR R=<%s> %s";
3555 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3556 addr, c+1, recipients_count);
3557 rc = acl_check(ACL_WHERE_PRDR, addr,
3558 acl_smtp_data_prdr, &user_msg, &log_msg);
3560 /* If any recipient rejected content, indicate it in final message */
3562 /* If all recipients rejected, indicate in final message */
3567 case OK: case DISCARD: code = US"250"; break;
3568 case DEFER: code = US"450"; break;
3569 default: code = US"550"; break;
3571 if (user_msg != NULL)
3572 smtp_user_msg(code, user_msg);
3577 case OK: case DISCARD:
3578 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3580 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3582 msg = string_sprintf(CS msg, addr, "refusal"); break;
3584 smtp_user_msg(code, msg);
3586 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3587 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3588 else log_write(0, LOG_MAIN, "%s", CS msg);
3590 if (rc != OK) { receive_remove_recipient(addr); c--; }
3592 /* Set up final message, used if data acl gives OK */
3593 smtp_reply = string_sprintf("%s id=%s message %s",
3594 all_fail == FAIL ? US"550" : US"250",
3597 ? US"rejected for all recipients"
3600 : US"accepted for some recipients");
3601 if (recipients_count == 0)
3603 message_id[0] = 0; /* Indicate no message accepted */
3608 prdr_requested = FALSE;
3609 #endif /* !DISABLE_PRDR */
3611 /* Check the recipients count again, as the MIME ACL might have changed
3614 if (acl_smtp_data != NULL && recipients_count > 0)
3616 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3617 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3620 recipients_count = 0;
3621 blackholed_by = US"DATA ACL";
3623 blackhole_log_msg = string_sprintf(": %s", log_msg);
3624 cancel_cutthrough_connection(TRUE, US"data acl discard");
3628 Uunlink(spool_name);
3629 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3630 #ifdef WITH_CONTENT_SCAN
3633 #ifdef EXPERIMENTAL_DCC
3636 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3637 smtp_yield = FALSE; /* No more messages after dropped connection */
3638 smtp_reply = US""; /* Indicate reply already sent */
3639 message_id[0] = 0; /* Indicate no message accepted */
3640 goto TIDYUP; /* Skip to end of function */
3645 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3646 we cannot take different actions for permanent and temporary rejections. */
3651 #ifdef WITH_CONTENT_SCAN
3652 if ( acl_not_smtp_mime
3653 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3657 #endif /* WITH_CONTENT_SCAN */
3661 uschar *user_msg, *log_msg;
3662 f.authentication_local = TRUE;
3663 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3666 recipients_count = 0;
3667 blackholed_by = US"non-SMTP ACL";
3669 blackhole_log_msg = string_sprintf(": %s", log_msg);
3673 Uunlink(spool_name);
3674 #ifdef WITH_CONTENT_SCAN
3677 #ifdef EXPERIMENTAL_DCC
3680 /* The ACL can specify where rejections are to be logged, possibly
3681 nowhere. The default is main and reject logs. */
3683 if (log_reject_target)
3684 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3685 sender_address, log_msg);
3687 if (!user_msg) user_msg = US"local configuration problem";
3688 if (smtp_batched_input)
3689 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3690 /* Does not return */
3693 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3694 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3695 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3697 /* Does not return */
3700 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3704 /* The applicable ACLs have been run */
3706 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3707 if (f.queue_only_policy) queued_by = US"ACL";
3710 #ifdef WITH_CONTENT_SCAN
3714 #ifdef EXPERIMENTAL_DCC
3719 #ifdef HAVE_LOCAL_SCAN
3720 /* The final check on the message is to run the scan_local() function. The
3721 version supplied with Exim always accepts, but this is a hook for sysadmins to
3722 supply their own checking code. The local_scan() function is run even when all
3723 the recipients have been discarded. */
3725 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3727 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3728 deleted, and the incident gets logged. */
3730 if (sigsetjmp(local_scan_env, 1) == 0)
3732 had_local_scan_crash = 0;
3733 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3734 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3735 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3736 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3738 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3739 local_scan_timeout);
3740 local_scan_data = NULL;
3742 had_local_scan_timeout = 0;
3743 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3744 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3745 rc = local_scan(data_fd, &local_scan_data);
3747 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3749 f.enable_dollar_recipients = FALSE;
3751 store_pool = POOL_MAIN; /* In case changed */
3752 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3755 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3756 os_non_restarting_signal(SIGFPE, SIG_DFL);
3757 os_non_restarting_signal(SIGILL, SIG_DFL);
3758 os_non_restarting_signal(SIGBUS, SIG_DFL);
3762 if (had_local_scan_crash)
3764 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3765 "signal %d - message temporarily rejected (size %d)",
3766 had_local_scan_crash, message_size);
3767 receive_bomb_out(US"local-scan-error", US"local verification problem");
3768 /* Does not return */
3770 if (had_local_scan_timeout)
3772 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3773 "message temporarily rejected (size %d)", message_size);
3774 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3775 /* Does not return */
3779 /* The length check is paranoia against some runaway code, and also because
3780 (for a success return) lines in the spool file are read into big_buffer. */
3782 if (local_scan_data)
3784 int len = Ustrlen(local_scan_data);
3785 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3786 local_scan_data = string_copyn(local_scan_data, len);
3789 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3791 if (!f.deliver_freeze) /* ACL might have already frozen */
3793 f.deliver_freeze = TRUE;
3794 deliver_frozen_at = time(NULL);
3795 frozen_by = US"local_scan()";
3797 rc = LOCAL_SCAN_ACCEPT;
3799 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3801 if (!f.queue_only_policy) /* ACL might have already queued */
3803 f.queue_only_policy = TRUE;
3804 queued_by = US"local_scan()";
3806 rc = LOCAL_SCAN_ACCEPT;
3809 /* Message accepted: remove newlines in local_scan_data because otherwise
3810 the spool file gets corrupted. Ensure that all recipients are qualified. */
3812 if (rc == LOCAL_SCAN_ACCEPT)
3814 if (local_scan_data)
3815 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3816 for (int i = 0; i < recipients_count; i++)
3818 recipient_item *r = recipients_list + i;
3819 r->address = rewrite_address_qualify(r->address, TRUE);
3821 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3823 if (recipients_count == 0 && !blackholed_by)
3824 blackholed_by = US"local_scan";
3827 /* Message rejected: newlines permitted in local_scan_data to generate
3828 multiline SMTP responses. */
3832 uschar *istemp = US"";
3836 errmsg = local_scan_data;
3838 Uunlink(spool_name); /* Cancel this message */
3842 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3843 "rejection given", rc);
3846 case LOCAL_SCAN_REJECT_NOLOGHDR:
3847 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3850 case LOCAL_SCAN_REJECT:
3851 smtp_code = US"550";
3852 if (!errmsg) errmsg = US"Administrative prohibition";
3855 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3856 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3859 case LOCAL_SCAN_TEMPREJECT:
3861 smtp_code = US"451";
3862 if (!errmsg) errmsg = US"Temporary local problem";
3863 istemp = US"temporarily ";
3867 g = string_append(NULL, 2, US"F=",
3868 sender_address[0] == 0 ? US"<>" : sender_address);
3869 g = add_host_info_for_log(g);
3871 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3872 string_from_gstring(g), istemp, string_printing(errmsg));
3875 if (!smtp_batched_input)
3877 smtp_respond(smtp_code, 3, TRUE, errmsg);
3878 message_id[0] = 0; /* Indicate no message accepted */
3879 smtp_reply = US""; /* Indicate reply already sent */
3880 goto TIDYUP; /* Skip to end of function */
3883 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3884 /* Does not return */
3887 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3888 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3889 US"message rejected by local scan code: ", error_rc, spool_data_file,
3891 /* Does not return */
3895 /* Reset signal handlers to ignore signals that previously would have caused
3896 the message to be abandoned. */
3898 signal(SIGTERM, SIG_IGN);
3899 signal(SIGINT, SIG_IGN);
3900 #endif /* HAVE_LOCAL_SCAN */
3903 /* Ensure the first time flag is set in the newly-received message. */
3905 f.deliver_firsttime = TRUE;
3907 #ifdef EXPERIMENTAL_BRIGHTMAIL
3909 { /* rewind data file */
3910 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3911 bmi_verdicts = bmi_process_message(header_list, data_fd);
3915 /* Update the timestamp in our Received: header to account for any time taken by
3916 an ACL or by local_scan(). The new time is the time that all reception
3917 processing is complete. */
3919 timestamp = expand_string(US"${tod_full}");
3920 tslen = Ustrlen(timestamp);
3922 memcpy(received_header->text + received_header->slen - tslen - 1,
3925 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3929 f.deliver_freeze = FALSE;
3930 f.queue_only_policy = FALSE;
3933 /* Keep the data file open until we have written the header file, in order to
3934 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3935 don't write the header file, and we unlink the data file. If writing the header
3936 file fails, we have failed to accept this message. */
3938 if (host_checking || blackholed_by)
3940 Uunlink(spool_name);
3941 msg_size = 0; /* Compute size for log line */
3942 for (header_line * h = header_list; h; h = h->next)
3943 if (h->type != '*') msg_size += h->slen;
3946 /* Write the -H file */
3949 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3951 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3952 Uunlink(spool_name); /* Lose the data file */
3956 smtp_reply = US"451 Error in writing spool file";
3957 message_id[0] = 0; /* Indicate no message accepted */
3962 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3963 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3965 /* Does not return */
3970 /* The message has now been successfully received. */
3972 receive_messagecount++;
3974 /* Add data size to written header size. We do not count the initial file name
3975 that is in the file, but we do add one extra for the notional blank line that
3976 precedes the data. This total differs from message_size in that it include the
3977 added Received: header and any other headers that got created locally. */
3979 if (fflush(spool_data_file))
3981 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
3982 log_write(0, LOG_MAIN, "%s\n", errmsg);
3983 Uunlink(spool_name); /* Lose the data file */
3987 smtp_reply = US"451 Error in writing spool file";
3988 message_id[0] = 0; /* Indicate no message accepted */
3993 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3994 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3996 /* Does not return */
3999 fstat(data_fd, &statbuf);
4001 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
4003 /* Generate a "message received" log entry. We do this by building up a dynamic
4004 string as required. We log the arrival of a new message while the
4005 file is still locked, just in case the machine is *really* fast, and delivers
4006 it first! Include any message id that is in the message - since the syntax of a
4007 message id is actually an addr-spec, we can use the parse routine to canonicalize
4010 rcvd_log_reset_point = store_mark();
4011 g = string_get(256);
4013 g = string_append(g, 2,
4014 fake_response == FAIL ? US"(= " : US"<= ",
4015 sender_address[0] == 0 ? US"<>" : sender_address);
4016 if (message_reference)
4017 g = string_append(g, 2, US" R=", message_reference);
4019 g = add_host_info_for_log(g);
4022 if (LOGGING(tls_cipher) && tls_in.cipher)
4024 g = string_append(g, 2, US" X=", tls_in.cipher);
4025 # ifndef DISABLE_TLS_RESUME
4026 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4027 g = string_catn(g, US"*", 1);
4030 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4031 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4032 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4033 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4034 if (LOGGING(tls_sni) && tls_in.sni)
4035 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4038 if (sender_host_authenticated)
4040 g = string_append(g, 2, US" A=", sender_host_authenticated);
4041 if (authenticated_id)
4043 g = string_append(g, 2, US":", authenticated_id);
4044 if (LOGGING(smtp_mailauth) && authenticated_sender)
4045 g = string_append(g, 2, US":", authenticated_sender);
4049 #ifndef DISABLE_PRDR
4051 g = string_catn(g, US" PRDR", 5);
4054 #ifdef SUPPORT_PROXY
4055 if (proxy_session && LOGGING(proxy))
4056 g = string_append(g, 2, US" PRX=", proxy_local_address);
4059 if (chunking_state > CHUNKING_OFFERED)
4060 g = string_catn(g, US" K", 2);
4062 g = string_fmt_append(g, " S=%d", msg_size);
4064 /* log 8BITMIME mode announced in MAIL_FROM
4068 if (LOGGING(8bitmime))
4069 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4071 #ifndef DISABLE_DKIM
4072 if (LOGGING(dkim) && dkim_verify_overall)
4073 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4074 # ifdef EXPERIMENTAL_ARC
4075 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4076 g = string_catn(g, US" ARC", 4);
4080 if (LOGGING(receive_time))
4082 struct timeval diff = received_time_complete;
4083 timediff(&diff, &received_time);
4084 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4088 g = string_append(g, 2, US" Q=", queue_name);
4090 /* If an addr-spec in a message-id contains a quoted string, it can contain
4091 any characters except " \ and CR and so in particular it can contain NL!
4092 Therefore, make sure we use a printing-characters only version for the log.
4093 Also, allow for domain literals in the message id. */
4095 if ( LOGGING(msg_id) && msgid_header
4096 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4100 BOOL save_allow_domain_literals = allow_domain_literals;
4101 allow_domain_literals = TRUE;
4102 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4103 &errmsg, &start, &end, &domain, FALSE);
4104 allow_domain_literals = save_allow_domain_literals;
4106 g = string_append(g, 2,
4107 msgid_header_newly_created ? US" id*=" : US" id=",
4108 string_printing(old_id));
4111 /* If subject logging is turned on, create suitable printing-character
4112 text. By expanding $h_subject: we make use of the MIME decoding. */
4114 if (LOGGING(subject) && subject_header)
4116 uschar *p = big_buffer;
4117 uschar *ss = expand_string(US"$h_subject:");
4119 /* Backslash-quote any double quotes or backslashes so as to make a
4120 a C-like string, and turn any non-printers into escape sequences. */
4123 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4125 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4130 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4133 /* Terminate the string: string_cat() and string_append() leave room, but do
4134 not put the zero in. */
4136 (void) string_from_gstring(g);
4138 /* Create a message log file if message logs are being used and this message is
4139 not blackholed. Write the reception stuff to it. We used to leave message log
4140 creation until the first delivery, but this has proved confusing for some
4143 if (message_logs && !blackholed_by)
4146 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4148 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4152 (void)directory_make(spool_directory,
4153 spool_sname(US"msglog", message_subdir),
4154 MSGLOG_DIRECTORY_MODE, TRUE);
4155 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4159 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4160 m_name, strerror(errno));
4163 FILE *message_log = fdopen(fd, "a");
4166 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4167 m_name, strerror(errno));
4172 uschar *now = tod_stamp(tod_log);
4173 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4174 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4176 if (f.queue_only_policy) fprintf(message_log,
4177 "%s no immediate delivery: queued%s%s by %s\n", now,
4178 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4180 (void)fclose(message_log);
4185 /* Everything has now been done for a successful message except logging its
4186 arrival, and outputting an SMTP response. While writing to the log, set a flag
4187 to cause a call to receive_bomb_out() if the log cannot be opened. */
4189 f.receive_call_bombout = TRUE;
4191 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4192 connection has gone away. This can only be done if there is no unconsumed input
4193 waiting in the local input buffer. We can test for this by calling
4194 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4195 input to be sent following the final dot, so the presence of following input is
4198 If the connection is still present, but there is no unread input for the
4199 socket, the result of a select() call will be zero. If, however, the connection
4200 has gone away, or if there is pending input, the result of select() will be
4201 non-zero. The two cases can be distinguished by trying to read the next input
4202 character. If we succeed, we can unread it so that it remains in the local
4203 buffer for handling later. If not, the connection has been lost.
4205 Of course, since TCP/IP is asynchronous, there is always a chance that the
4206 connection will vanish between the time of this test and the sending of the
4207 response, but the chance of this happening should be small. */
4209 if (smtp_input && sender_host_address && !f.sender_host_notsocket &&
4210 !receive_smtp_buffered())
4212 struct timeval tv = {.tv_sec = 0, .tv_usec = 0};
4213 fd_set select_check;
4214 FD_ZERO(&select_check);
4215 FD_SET(fileno(smtp_in), &select_check);
4217 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4219 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4220 if (c != EOF) (receive_ungetc)(c); else
4222 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4223 smtp_reply = US""; /* No attempt to send a response */
4224 smtp_yield = FALSE; /* Nothing more on this connection */
4226 /* Re-use the log line workspace */
4229 g = string_cat(g, US"SMTP connection lost after final dot");
4230 g = add_host_info_for_log(g);
4231 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4233 /* Delete the files for this aborted message. */
4235 Uunlink(spool_name);
4236 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4237 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4244 /* The connection has not gone away; we really are going to take responsibility
4245 for this message. */
4247 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4250 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4251 the sender's dot (below).
4252 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4253 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4254 in which case pass temp-reject back to initiator and dump the files.
4256 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4258 XXX We do not handle queue-only, freezing, or blackholes.
4260 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4262 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4263 /* Logging was done in finaldot() */
4266 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4267 cutthrough_done = ACCEPTED;
4268 break; /* message_id needed for SMTP accept below */
4270 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4271 ... for which, pass back the exact error */
4272 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4273 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4274 break; /* message_id needed for SMTP accept below */
4276 default: /* Unknown response, or error. Treat as temp-reject. */
4277 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4278 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4279 break; /* message_id needed for SMTP accept below */
4281 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4282 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4283 cutthrough_done = PERM_REJ;
4288 #ifndef DISABLE_PRDR
4289 if(!smtp_reply || prdr_requested)
4294 log_write(0, LOG_MAIN |
4295 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4296 (LOGGING(received_sender) ? LOG_SENDER : 0),
4299 /* Log any control actions taken by an ACL or local_scan(). */
4301 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4302 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4303 "no immediate delivery: queued%s%s by %s",
4304 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4307 f.receive_call_bombout = FALSE;
4309 /* The store for the main log message can be reused */
4310 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4312 /* If the message is frozen, and freeze_tell is set, do the telling. */
4314 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4315 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4316 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4317 message_id, frozen_by, sender_address);
4320 /* Either a message has been successfully received and written to the two spool
4321 files, or an error in writing the spool has occurred for an SMTP message, or
4322 an SMTP message has been rejected for policy reasons, or a message was passed on
4323 by cutthrough delivery. (For a non-SMTP message we will have already given up
4324 because there's no point in carrying on!) For non-cutthrough we must now close
4325 (and thereby unlock) the data file. In the successful case, this leaves the
4326 message on the spool, ready for delivery. In the error case, the spool file will
4327 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4330 For cutthrough we hold the data file locked until we have deleted it, otherwise
4331 a queue-runner could grab it in the window.
4333 A fflush() was done earlier in the expectation that any write errors on the
4334 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4335 possible for fclose() to fail - but what to do? What has happened to the lock
4336 if this happens? We can at least log it; if it is observed on some platform
4337 then we can think about properly declaring the message not-received. */
4341 process_info[process_info_len] = 0; /* Remove message id */
4342 if (spool_data_file && cutthrough_done == NOT_TRIED)
4344 if (fclose(spool_data_file)) /* Frees the lock */
4345 log_write(0, LOG_MAIN|LOG_PANIC,
4346 "spoolfile error on close: %s", strerror(errno));
4347 spool_data_file = NULL;
4350 /* Now reset signal handlers to their defaults */
4352 signal(SIGTERM, SIG_DFL);
4353 signal(SIGINT, SIG_DFL);
4355 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4356 value, which defaults TRUE - meaning there may be more incoming messages from
4357 this connection. For non-SMTP callers (where there is only ever one message),
4358 the default is FALSE. */
4364 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4365 is set to the response that should be sent. When it is NULL, we generate
4366 default responses. After an ACL error or local_scan() error, the response has
4367 already been sent, and smtp_reply is an empty string to indicate this. */
4369 if (!smtp_batched_input)
4373 if (fake_response != OK)
4374 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4375 3, TRUE, fake_response_text);
4377 /* An OK response is required; use "message" text if present. */
4381 uschar *code = US"250";
4383 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4384 smtp_respond(code, len, TRUE, user_msg);
4387 /* Default OK response */
4389 else if (chunking_state > CHUNKING_OFFERED)
4391 /* If there is more input waiting, no need to flush (probably the client
4392 pipelined QUIT after data). We check only the in-process buffer, not
4395 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4396 receive_smtp_buffered(),
4397 chunking_datasize, message_size+message_linecount, message_id);
4398 chunking_state = CHUNKING_OFFERED;
4401 smtp_printf("250 OK id=%s\r\n", receive_smtp_buffered(), message_id);
4405 "\n**** SMTP testing: that is not a real message id!\n\n");
4408 /* smtp_reply is set non-empty */
4410 else if (smtp_reply[0] != 0)
4411 if (fake_response != OK && smtp_reply[0] == '2')
4412 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4413 fake_response_text);
4415 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4417 switch (cutthrough_done)
4420 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4422 /* Delete spool files */
4423 Uunlink(spool_name);
4424 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4425 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4429 if (cutthrough.defer_pass)
4431 Uunlink(spool_name);
4432 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4433 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4438 if (cutthrough_done != NOT_TRIED)
4440 if (spool_data_file)
4442 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4443 spool_data_file = NULL;
4445 message_id[0] = 0; /* Prevent a delivery from starting */
4446 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4447 cutthrough.defer_pass = FALSE;
4451 /* For batched SMTP, generate an error message on failure, and do
4452 nothing on success. The function moan_smtp_batch() does not return -
4453 it exits from the program with a non-zero return code. */
4455 else if (smtp_reply)
4456 moan_smtp_batch(NULL, "%s", smtp_reply);
4460 /* If blackholing, we can immediately log this message's sad fate. The data
4461 file has already been unlinked, and the header file was never written to disk.
4462 We must now indicate that nothing was received, to prevent a delivery from
4467 const uschar *detail =
4468 #ifdef HAVE_LOCAL_SCAN
4469 local_scan_data ? string_printing(local_scan_data) :
4471 string_sprintf("(%s discarded recipients)", blackholed_by);
4472 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4473 log_write(0, LOG_MAIN, "Completed");
4477 /* Reset headers so that logging of rejects for a subsequent message doesn't
4478 include them. It is also important to set header_last = NULL before exiting
4479 from this function, as this prevents certain rewrites that might happen during
4480 subsequent verifying (of another incoming message) from trying to add headers
4481 when they shouldn't. */
4483 header_list = header_last = NULL;
4485 return yield; /* TRUE if more messages (SMTP only) */
4488 /* End of receive.c */