1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2022 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
10 /* Code for receiving a message and setting up spool files. */
15 #ifdef EXPERIMENTAL_DCC
23 /*************************************************
24 * Local static variables *
25 *************************************************/
27 static int data_fd = -1;
28 static uschar *spool_name = US"";
30 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
32 #ifdef HAVE_LOCAL_SCAN
33 jmp_buf local_scan_env; /* error-handling context for local_scan */
34 unsigned had_local_scan_crash;
35 unsigned had_local_scan_timeout;
39 /*************************************************
40 * Non-SMTP character reading functions *
41 *************************************************/
43 /* These are the default functions that are set up in the variables such as
44 receive_getc initially. They just call the standard functions, passing stdin as
45 the file. (When SMTP input is occurring, different functions are used by
46 changing the pointer variables.) */
48 uschar stdin_buf[4096];
49 uschar * stdin_inptr = stdin_buf;
50 uschar * stdin_inend = stdin_buf;
55 size_t rc = fread(stdin_buf, 1, sizeof(stdin_buf), stdin);
60 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
61 log_write(L_lost_incoming_connection,
62 LOG_MAIN, "timed out while reading local message");
63 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
67 if (filter_test == FTEST_NONE)
69 fprintf(stderr, "\nexim: %s received - message abandoned\n",
70 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
71 log_write(0, LOG_MAIN, "%s received while reading local message",
72 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
74 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
78 stdin_inend = stdin_buf + rc;
79 stdin_inptr = stdin_buf;
84 stdin_getc(unsigned lim)
86 if (stdin_inptr >= stdin_inend)
89 return *stdin_inptr++;
96 return stdin_inptr < stdin_inend;
102 if (stdin_inptr <= stdin_buf)
103 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "buffer underflow in stdin_ungetc");
112 return stdin_hasc() ? FALSE : feof(stdin);
118 return ferror(stdin);
124 /*************************************************
125 * Check that a set sender is allowed *
126 *************************************************/
128 /* This function is called when a local caller sets an explicit sender address.
129 It checks whether this is permitted, which it is for trusted callers.
130 Otherwise, it must match the pattern(s) in untrusted_set_sender.
132 Arguments: the proposed sender address
133 Returns: TRUE for a trusted caller
134 TRUE if the address has been set, untrusted_set_sender has been
135 set, and the address matches something in the list
140 receive_check_set_sender(uschar *newsender)
143 if (f.trusted_caller) return TRUE;
144 if (!newsender || !untrusted_set_sender) return FALSE;
145 qnewsender = Ustrchr(newsender, '@')
146 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
147 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
153 /*************************************************
154 * Read space info for a partition *
155 *************************************************/
157 /* This function is called by receive_check_fs() below, and also by string
158 expansion for variables such as $spool_space. The field names for the statvfs
159 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
160 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
161 have inodes, and they return -1 for the number available.
163 Later: It turns out that some file systems that do not have the concept of
164 inodes return 0 rather than -1. Such systems should also return 0 for the total
165 number of inodes, so we require that to be greater than zero before returning
169 isspool TRUE for spool partition, FALSE for log partition
170 inodeptr address of int to receive inode count; -1 if there isn't one
172 Returns: available on-root space, in kilobytes
173 -1 for log partition if there isn't one
175 All values are -1 if the STATFS functions are not available.
179 receive_statvfs(BOOL isspool, int *inodeptr)
182 struct STATVFS statbuf;
188 /* The spool directory must always exist. */
192 path = spool_directory;
196 /* Need to cut down the log file path to the directory, and to ignore any
197 appearance of "syslog" in it. */
201 int sep = ':'; /* Not variable - outside scripts use */
202 const uschar *p = log_file_path;
205 /* An empty log_file_path means "use the default". This is the same as an
206 empty item in a list. */
208 if (*p == 0) p = US":";
209 /* should never be a tainted list */
210 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
211 if (Ustrcmp(path, "syslog") != 0)
214 if (path == NULL) /* No log files */
220 /* An empty string means use the default, which is in the spool directory.
221 But don't just use the spool directory, as it is possible that the log
222 subdirectory has been symbolically linked elsewhere. */
226 sprintf(CS buffer, CS"%s/log", CS spool_directory);
232 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
236 /* We now have the path; do the business */
238 memset(&statbuf, 0, sizeof(statbuf));
240 if (STATVFS(CS path, &statbuf) != 0)
241 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
242 { /* Can happen on first run after installation */
248 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
249 "%s directory %s: %s", name, path, strerror(errno));
250 smtp_closedown(US"spool or log directory problem");
251 exim_exit(EXIT_FAILURE);
254 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
256 /* Disks are getting huge. Take care with computing the size in kilobytes. */
258 return (int_eximarith_t)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
261 /* Unable to find partition sizes in this environment. */
271 /*************************************************
272 * Check space on spool and log partitions *
273 *************************************************/
275 /* This function is called before accepting a message; if any thresholds are
276 set, it checks them. If a message_size is supplied, it checks that there is
277 enough space for that size plus the threshold - i.e. that the message won't
278 reduce the space to the threshold. Not all OS have statvfs(); for those that
279 don't, this function always returns TRUE. For some OS the old function and
280 struct name statfs is used; that is handled by a macro, defined in exim.h.
283 msg_size the (estimated) size of an incoming message
285 Returns: FALSE if there isn't enough space, or if the information cannot
287 TRUE if no check was done or there is enough space
291 receive_check_fs(int msg_size)
293 int_eximarith_t space;
296 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
298 space = receive_statvfs(TRUE, &inodes);
301 debug_printf("spool directory space = " PR_EXIM_ARITH "K inodes = %d "
302 "check_space = " PR_EXIM_ARITH "K inodes = %d msg_size = %d\n",
303 space, inodes, check_spool_space, check_spool_inodes, msg_size);
305 if ( space >= 0 && space + msg_size / 1024 < check_spool_space
306 || inodes >= 0 && inodes < check_spool_inodes)
308 log_write(0, LOG_MAIN, "spool directory space check failed: space="
309 PR_EXIM_ARITH " inodes=%d", space, inodes);
314 if (check_log_space > 0 || check_log_inodes > 0)
316 space = receive_statvfs(FALSE, &inodes);
319 debug_printf("log directory space = " PR_EXIM_ARITH "K inodes = %d "
320 "check_space = " PR_EXIM_ARITH "K inodes = %d\n",
321 space, inodes, check_log_space, check_log_inodes);
323 if ( space >= 0 && space < check_log_space
324 || inodes >= 0 && inodes < check_log_inodes)
326 log_write(0, LOG_MAIN, "log directory space check failed: space=" PR_EXIM_ARITH
327 " inodes=%d", space, inodes);
337 /*************************************************
338 * Bomb out while reading a message *
339 *************************************************/
341 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
342 received, or if there is a timeout. A rarer case might be if the log files are
343 screwed up and Exim can't open them to record a message's arrival. Handling
344 that case is done by setting a flag to cause the log functions to call this
345 function if there is an ultimate disaster. That is why it is globally
349 reason text reason to pass to the not-quit ACL
350 msg default SMTP response to give if in an SMTP session
355 receive_bomb_out(uschar *reason, uschar *msg)
357 static BOOL already_bombing_out;
358 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
359 timeouts, if someone has something slow in their quit ACL. Since the only
360 things we should be doing are to close down cleanly ASAP, on the second
361 pass we also close down stuff that might be opened again, before bypassing
362 the ACL call and exiting. */
364 /* If spool_name is set, it contains the name of the data file that is being
365 written. Unlink it before closing so that it cannot be picked up by a delivery
366 process. Ensure that any header file is also removed. */
368 if (spool_name[0] != '\0')
371 spool_name[Ustrlen(spool_name) - 1] = 'H';
373 spool_name[0] = '\0';
376 /* Now close the file if it is open, either as a fd or a stream. */
380 (void)fclose(spool_data_file);
381 spool_data_file = NULL;
383 else if (data_fd >= 0)
385 (void)close(data_fd);
389 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
390 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
393 if (!already_bombing_out)
395 already_bombing_out = TRUE;
398 if (smtp_batched_input)
399 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
400 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
401 smtp_active_hostname, msg);
405 /* Exit from the program (non-BSMTP cases) */
407 exim_exit(EXIT_FAILURE);
411 /*************************************************
412 * Data read timeout *
413 *************************************************/
415 /* Handler function for timeouts that occur while reading the data that
418 Argument: the signal number
423 data_timeout_handler(int sig)
425 had_data_timeout = sig;
430 #ifdef HAVE_LOCAL_SCAN
431 /*************************************************
432 * local_scan() timeout *
433 *************************************************/
435 /* Handler function for timeouts that occur while running a local_scan()
436 function. Posix recommends against calling longjmp() from a signal-handler,
437 but the GCC manual says you can so we will, and trust that it's better than
438 calling probably non-signal-safe funxtions during logging from within the
439 handler, even with other compilers.
441 See also https://cwe.mitre.org/data/definitions/745.html which also lists
444 This is all because we have no control over what might be written for a
445 local-scan function, so cannot sprinkle had-signal checks after each
446 call-site. At least with the default "do-nothing" function we won't
449 Argument: the signal number
454 local_scan_timeout_handler(int sig)
456 had_local_scan_timeout = sig;
457 siglongjmp(local_scan_env, 1);
462 /*************************************************
463 * local_scan() crashed *
464 *************************************************/
466 /* Handler function for signals that occur while running a local_scan()
469 Argument: the signal number
474 local_scan_crash_handler(int sig)
476 had_local_scan_crash = sig;
477 siglongjmp(local_scan_env, 1);
480 #endif /*HAVE_LOCAL_SCAN*/
483 /*************************************************
484 * SIGTERM or SIGINT received *
485 *************************************************/
487 /* Handler for SIGTERM or SIGINT signals that occur while reading the
488 data that comprises a message.
490 Argument: the signal number
495 data_sigterm_sigint_handler(int sig)
497 had_data_sigint = sig;
502 /*************************************************
503 * Add new recipient to list *
504 *************************************************/
506 /* This function builds a list of recipient addresses in argc/argv
510 recipient the next address to add to recipients_list
511 pno parent number for fixed aliases; -1 otherwise
517 receive_add_recipient(uschar *recipient, int pno)
519 if (recipients_count >= recipients_list_max)
521 recipient_item *oldlist = recipients_list;
522 int oldmax = recipients_list_max;
524 const int safe_recipients_limit = INT_MAX / 2 / sizeof(recipient_item);
525 if (recipients_list_max < 0 || recipients_list_max >= safe_recipients_limit)
527 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Too many recipients: %d", recipients_list_max);
530 recipients_list_max = recipients_list_max ? 2*recipients_list_max : 50;
531 recipients_list = store_get(recipients_list_max * sizeof(recipient_item), GET_UNTAINTED);
533 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
536 recipients_list[recipients_count].address = recipient;
537 recipients_list[recipients_count].pno = pno;
538 #ifdef EXPERIMENTAL_BRIGHTMAIL
539 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
540 /* reset optin string pointer for next recipient */
541 bmi_current_optin = NULL;
543 recipients_list[recipients_count].orcpt = NULL;
544 recipients_list[recipients_count].dsn_flags = 0;
545 recipients_list[recipients_count++].errors_to = NULL;
551 /*************************************************
552 * Send user response message *
553 *************************************************/
555 /* This function is passed a default response code and a user message. It calls
556 smtp_message_code() to check and possibly modify the response code, and then
557 calls smtp_respond() to transmit the response. I put this into a function
558 just to avoid a lot of repetition.
561 code the response code
562 user_msg the user message
569 smtp_user_msg(uschar *code, uschar *user_msg)
572 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
573 smtp_respond(code, len, TRUE, user_msg);
581 /*************************************************
582 * Remove a recipient from the list *
583 *************************************************/
585 /* This function is provided for local_scan() to use.
588 recipient address to remove
590 Returns: TRUE if it did remove something; FALSE otherwise
594 receive_remove_recipient(uschar *recipient)
596 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
598 for (int count = 0; count < recipients_count; count++)
599 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
601 if ((--recipients_count - count) > 0)
602 memmove(recipients_list + count, recipients_list + count + 1,
603 (recipients_count - count)*sizeof(recipient_item));
613 /* Pause for a while waiting for input. If none received in that time,
614 close the logfile, if we had one open; then if we wait for a long-running
615 datasource (months, in one use-case) log rotation will not leave us holding
621 if (!receive_timeout && !receive_hasc())
624 timesince(&t, &received_time);
625 if (t.tv_sec > 30*60)
628 if (poll_one_fd(0, POLLIN, (30*60 - t.tv_sec) * 1000) == 0)
633 /*************************************************
634 * Read data portion of a non-SMTP message *
635 *************************************************/
637 /* This function is called to read the remainder of a message (following the
638 header) when the input is not from SMTP - we are receiving a local message on
639 a standard input stream. The message is always terminated by EOF, and is also
640 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
641 two cases for maximum efficiency.
643 Ensure that the body ends with a newline. This will naturally be the case when
644 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
645 as "sequences of lines" - this of course strictly applies only to SMTP, but
646 deliveries into BSD-type mailbox files also require it. Exim used to have a
647 flag for doing this at delivery time, but as it was always set for all
648 transports, I decided to simplify things by putting the check here instead.
650 There is at least one MUA (dtmail) that sends CRLF via this interface, and
651 other programs are known to do this as well. Exim used to have a option for
652 dealing with this: in July 2003, after much discussion, the code has been
653 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
655 However, for the case when a dot on a line by itself terminates a message, the
656 only recognized terminating sequences before and after the dot are LF and CRLF.
657 Otherwise, having read EOL . CR, you don't know whether to read another
660 Internally, in messages stored in Exim's spool files, LF is used as the line
661 terminator. Under the new regime, bare CRs will no longer appear in these
665 fout a FILE to which to write the message
667 Returns: One of the END_xxx values indicating why it stopped reading
671 read_message_data(FILE *fout)
675 register int linelength = 0;
677 /* Handle the case when only EOF terminates the message */
684 log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF;
687 if (ch == 0) body_zerocount++;
688 if (last_ch == '\r' && ch != '\n')
690 if (linelength > max_received_linelength)
691 max_received_linelength = linelength;
693 if (fputc('\n', fout) == EOF) return END_WERROR;
697 if (ch == '\r') continue;
699 if (fputc(ch, fout) == EOF) return END_WERROR;
702 if (linelength > max_received_linelength)
703 max_received_linelength = linelength;
708 if (++message_size > thismessage_size_limit) return END_SIZE;
713 if (linelength > max_received_linelength)
714 max_received_linelength = linelength;
715 if (fputc('\n', fout) == EOF) return END_WERROR;
723 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
727 while (log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
729 if (ch == 0) body_zerocount++;
732 case 0: /* Normal state (previous char written) */
736 if (linelength > max_received_linelength)
737 max_received_linelength = linelength;
742 { ch_state = 2; continue; }
745 case 1: /* After written "\n" */
746 if (ch == '.') { ch_state = 3; continue; }
747 if (ch == '\r') { ch_state = 2; continue; }
748 if (ch == '\n') { body_linecount++; linelength = -1; }
753 body_linecount++; /* After unwritten "\r" */
754 if (linelength > max_received_linelength)
755 max_received_linelength = linelength;
763 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
764 if (ch == '\r') continue;
770 case 3: /* After "\n." (\n written, dot not) */
771 if (ch == '\n') return END_DOT;
772 if (ch == '\r') { ch_state = 4; continue; }
775 if (fputc('.', fout) == EOF) return END_WERROR;
779 case 4: /* After "\n.\r" (\n written, rest not) */
780 if (ch == '\n') return END_DOT;
783 if (fputs(".\n", fout) == EOF) return END_WERROR;
784 if (ch == '\r') { ch_state = 2; continue; }
790 if (fputc(ch, fout) == EOF) return END_WERROR;
791 if (++message_size > thismessage_size_limit) return END_SIZE;
794 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
795 the message ends with a newline, and we must also write any characters that
796 were saved up while testing for an ending dot. */
800 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
801 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
802 message_size += Ustrlen(ends[ch_state]);
812 /*************************************************
813 * Read data portion of an SMTP message *
814 *************************************************/
816 /* This function is called to read the remainder of an SMTP message (after the
817 headers), or to skip over it when an error has occurred. In this case, the
818 output file is passed as NULL.
820 If any line begins with a dot, that character is skipped. The input should only
821 be successfully terminated by CR LF . CR LF unless it is local (non-network)
822 SMTP, in which case the CRs are optional, but...
824 FUDGE: It seems that sites on the net send out messages with just LF
825 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
826 we make the CRs optional in all cases.
828 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
829 well, so that there are no CRs in spooled messages. However, the message
830 terminating dot is not recognized between two bare CRs.
833 fout a FILE to which to write the message; NULL if skipping
835 Returns: One of the END_xxx values indicating why it stopped reading
839 read_message_data_smtp(FILE *fout)
845 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
847 if (ch == 0) body_zerocount++;
850 case 0: /* After LF or CRLF */
854 continue; /* Don't ever write . after LF */
858 /* Else fall through to handle as normal uschar. */
860 case 1: /* Normal state */
865 if (linelength > max_received_linelength)
866 max_received_linelength = linelength;
876 case 2: /* After (unwritten) CR */
878 if (linelength > max_received_linelength)
879 max_received_linelength = linelength;
888 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
889 cutthrough_data_put_nl();
890 if (ch != '\r') ch_state = 1; else continue;
894 case 3: /* After [CR] LF . */
902 /* The dot was removed at state 3. For a doubled dot, here, reinstate
903 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
904 and to file below. */
908 cutthrough_data_puts(&c, 1);
913 case 4: /* After [CR] LF . CR */
914 if (ch == '\n') return END_DOT;
917 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
918 cutthrough_data_put_nl();
928 /* Add the character to the spool file, unless skipping; then loop for the
935 if (fputc(ch, fout) == EOF) return END_WERROR;
936 if (message_size > thismessage_size_limit) return END_SIZE;
939 cutthrough_data_put_nl();
943 cutthrough_data_puts(&c, 1);
947 /* Fall through here if EOF encountered. This indicates some kind of error,
948 since a correct message is terminated by [CR] LF . [CR] LF. */
956 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
957 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
958 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
959 body_linecount accounting for proper re-expansion for the wire, so use
960 a cut-down version of the state-machine above; we don't need to do leading-dot
961 detection and unstuffing.
964 fout a FILE to which to write the message; NULL if skipping;
965 must be open for both writing and reading.
967 Returns: One of the END_xxx values indicating why it stopped reading
971 read_message_bdat_smtp(FILE * fout)
973 int linelength = 0, ch;
974 enum CH_STATE ch_state = LF_SEEN;
979 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
981 case EOF: return END_EOF;
982 case ERR: return END_PROTOCOL;
984 /* Nothing to get from the sender anymore. We check the last
985 character written to the spool.
987 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
988 If we would be strict, we would refuse such broken messages.
989 But we are liberal, so we fix it. It would be easy just to append
990 the "\n" to the spool.
992 But there are some more things (line counting, message size calculation and such),
993 that would need to be duplicated here. So we simply do some ungetc
998 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
999 if (fgetc(fout) == '\n') return END_DOT;
1002 if (linelength == -1) /* \r already seen (see below) */
1004 DEBUG(D_receive) debug_printf("Add missing LF\n");
1008 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
1009 bdat_ungetc('\r'); /* not even \r was seen */
1013 case '\0': body_zerocount++; break;
1017 case LF_SEEN: /* After LF or CRLF */
1018 ch_state = MID_LINE;
1019 /* fall through to handle as normal uschar. */
1021 case MID_LINE: /* Mid-line state */
1026 if (linelength > max_received_linelength)
1027 max_received_linelength = linelength;
1030 else if (ch == '\r')
1033 if (fix_nl) bdat_ungetc('\n');
1034 continue; /* don't write CR */
1038 case CR_SEEN: /* After (unwritten) CR */
1040 if (linelength > max_received_linelength)
1041 max_received_linelength = linelength;
1048 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
1049 cutthrough_data_put_nl();
1050 if (ch == '\r') continue; /* don't write CR */
1051 ch_state = MID_LINE;
1056 /* Add the character to the spool file, unless skipping */
1062 if (fputc(ch, fout) == EOF) return END_WERROR;
1063 if (message_size > thismessage_size_limit) return END_SIZE;
1066 cutthrough_data_put_nl();
1070 cutthrough_data_puts(&c, 1);
1077 read_message_bdat_smtp_wire(FILE * fout)
1081 /* Remember that this message uses wireformat. */
1083 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1084 fout ? "writing spoolfile in wire format" : "flushing input");
1085 f.spool_file_wireformat = TRUE;
1089 if (chunking_data_left > 0)
1091 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1092 uschar * buf = bdat_getbuf(&len);
1094 if (!buf) return END_EOF;
1095 message_size += len;
1096 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1098 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1100 case EOF: return END_EOF;
1101 case EOD: return END_DOT;
1102 case ERR: return END_PROTOCOL;
1108 max_received_linelength
1112 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1115 if (message_size > thismessage_size_limit) return END_SIZE;
1123 /*************************************************
1124 * Swallow SMTP message *
1125 *************************************************/
1127 /* This function is called when there has been some kind of error while reading
1128 an SMTP message, and the remaining data may need to be swallowed. It is global
1129 because it is called from smtp_closedown() to shut down an incoming call
1132 Argument: a FILE from which to read the message
1137 receive_swallow_smtp(void)
1139 if (message_ended >= END_NOTENDED)
1140 message_ended = chunking_state <= CHUNKING_OFFERED
1141 ? read_message_data_smtp(NULL)
1142 : read_message_bdat_smtp_wire(NULL);
1147 /*************************************************
1148 * Handle lost SMTP connection *
1149 *************************************************/
1151 /* This function logs connection loss incidents and generates an appropriate
1154 Argument: additional data for the message
1155 Returns: the SMTP response
1159 handle_lost_connection(uschar *s)
1161 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1162 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1163 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1164 return US"421 Lost incoming connection";
1170 /*************************************************
1171 * Handle a non-smtp reception error *
1172 *************************************************/
1174 /* This function is called for various errors during the reception of non-SMTP
1175 messages. It either sends a message to the sender of the problem message, or it
1176 writes to the standard error stream.
1179 errcode code for moan_to_sender(), identifying the error
1180 text1 first message text, passed to moan_to_sender()
1181 text2 second message text, used only for stderrr
1182 error_rc code to pass to exim_exit if no problem
1183 f FILE containing body of message (may be stdin)
1184 hptr pointer to instore headers or NULL
1186 Returns: calls exim_exit(), which does not return
1190 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1191 FILE *f, header_line *hptr)
1193 if (error_handling == ERRORS_SENDER)
1197 eblock.text1 = text1;
1198 eblock.text2 = US"";
1199 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1200 error_rc = EXIT_FAILURE;
1203 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1205 exim_exit(error_rc);
1210 /*************************************************
1211 * Add header lines set up by ACL *
1212 *************************************************/
1214 /* This function is called to add the header lines that were set up by
1215 statements in an ACL to the list of headers in memory. It is done in two stages
1216 like this, because when the ACL for RCPT is running, the other headers have not
1217 yet been received. This function is called twice; once just before running the
1218 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1219 are visible to the DATA ACL.
1221 Originally these header lines were added at the end. Now there is support for
1222 three different places: top, bottom, and after the Received: header(s). There
1223 will always be at least one Received: header, even if it is marked deleted, and
1224 even if something else has been put in front of it.
1227 acl_name text to identify which ACL
1233 add_acl_headers(int where, uschar *acl_name)
1235 header_line *last_received = NULL;
1239 case ACL_WHERE_DKIM:
1240 case ACL_WHERE_MIME:
1241 case ACL_WHERE_DATA:
1242 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1243 && (acl_removed_headers || acl_added_headers))
1245 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1246 " will not take effect on cutthrough deliveries");
1251 if (acl_removed_headers)
1253 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1255 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1257 const uschar * list = acl_removed_headers;
1258 int sep = ':'; /* This is specified as a colon-separated list */
1261 while ((s = string_nextinlist(&list, &sep, NULL, 0)))
1262 if (header_testname(h, s, Ustrlen(s), FALSE))
1264 h->type = htype_old;
1265 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1268 acl_removed_headers = NULL;
1269 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1272 if (!acl_added_headers) return;
1273 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1275 for (header_line * h = acl_added_headers, * next; h; h = next)
1282 h->next = header_list;
1284 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1290 last_received = header_list;
1291 while (!header_testname(last_received, US"Received", 8, FALSE))
1292 last_received = last_received->next;
1293 while (last_received->next &&
1294 header_testname(last_received->next, US"Received", 8, FALSE))
1295 last_received = last_received->next;
1297 h->next = last_received->next;
1298 last_received->next = h;
1299 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1303 /* add header before any header which is NOT Received: or Resent- */
1304 last_received = header_list;
1305 while ( last_received->next &&
1306 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1307 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1308 last_received = last_received->next;
1309 /* last_received now points to the last Received: or Resent-* header
1310 in an uninterrupted chain of those header types (seen from the beginning
1311 of all headers. Our current header must follow it. */
1312 h->next = last_received->next;
1313 last_received->next = h;
1314 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1319 header_last->next = h;
1320 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1324 if (!h->next) header_last = h;
1326 /* Check for one of the known header types (From:, To:, etc.) though in
1327 practice most added headers are going to be "other". Lower case
1328 identification letters are never stored with the header; they are used
1329 for existence tests when messages are received. So discard any lower case
1332 h->type = header_checkname(h, FALSE);
1333 if (h->type >= 'a') h->type = htype_other;
1335 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1338 acl_added_headers = NULL;
1339 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1344 /*************************************************
1345 * Add host information for log line *
1346 *************************************************/
1348 /* Called for acceptance and rejecting log lines. This adds information about
1349 the calling host to a string that is being built dynamically.
1352 s the dynamic string
1354 Returns: the extended string
1358 add_host_info_for_log(gstring * g)
1360 if (sender_fullhost)
1362 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1363 g = string_catn(g, US" DS", 3);
1364 g = string_append(g, 2, US" H=", sender_fullhost);
1365 if (LOGGING(incoming_interface) && interface_address)
1366 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1368 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1370 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1371 f.tcp_in_fastopen_logged = TRUE;
1374 g = string_append(g, 2, US" U=", sender_ident);
1375 if (received_protocol)
1376 g = string_append(g, 2, US" P=", received_protocol);
1377 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1379 g = string_catn(g, US" L", 2);
1380 #ifndef DISABLE_PIPE_CONNECT
1381 if (f.smtp_in_early_pipe_used)
1382 g = string_catn(g, US"*", 1);
1383 else if (f.smtp_in_early_pipe_advertised)
1384 g = string_catn(g, US".", 1);
1386 if (!f.smtp_in_pipelining_used)
1387 g = string_catn(g, US"-", 1);
1394 #ifdef WITH_CONTENT_SCAN
1396 /*************************************************
1397 * Run the MIME ACL on a message *
1398 *************************************************/
1400 /* This code is in a subroutine so that it can be used for both SMTP
1401 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1404 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1405 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1406 smtp_reply_ptr Where SMTP reply is being built
1407 blackholed_by_ptr Where "blackholed by" message is being built
1409 Returns: TRUE to carry on; FALSE to abandon the message
1413 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1414 uschar **blackholed_by_ptr)
1417 uschar * rfc822_file_path = NULL;
1418 unsigned long mbox_size;
1419 uschar *user_msg, *log_msg;
1420 int mime_part_count_buffer = -1;
1421 uschar * mbox_filename;
1424 /* check if it is a MIME message */
1426 for (header_line * my_headerlist = header_list; my_headerlist;
1427 my_headerlist = my_headerlist->next)
1428 if ( my_headerlist->type != '*' /* skip deleted headers */
1429 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1432 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1436 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1441 /* make sure the eml mbox file is spooled up */
1442 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1443 { /* error while spooling */
1444 log_write(0, LOG_MAIN|LOG_PANIC,
1445 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1446 Uunlink(spool_name);
1448 #ifdef EXPERIMENTAL_DCC
1451 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1452 message_id[0] = 0; /* Indicate no message accepted */
1453 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1454 return FALSE; /* Indicate skip to end of receive function */
1460 mime_part_count = -1;
1461 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1462 (void)fclose(mbox_file);
1464 if (rfc822_file_path)
1466 mime_part_count = mime_part_count_buffer;
1468 if (unlink(CS rfc822_file_path) == -1)
1470 log_write(0, LOG_PANIC,
1471 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1474 rfc822_file_path = NULL;
1477 /* check if we must check any message/rfc822 attachments */
1480 uschar * scandir = string_copyn(mbox_filename,
1481 Ustrrchr(mbox_filename, '/') - mbox_filename);
1482 struct dirent * entry;
1485 for (tempdir = exim_opendir(scandir); entry = readdir(tempdir); )
1486 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1488 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1490 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1496 if (rfc822_file_path)
1498 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1500 /* set RFC822 expansion variable */
1502 mime_part_count_buffer = mime_part_count;
1503 goto MIME_ACL_CHECK;
1505 log_write(0, LOG_PANIC,
1506 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1507 unlink(CS rfc822_file_path);
1512 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1515 recipients_count = 0;
1516 *blackholed_by_ptr = US"MIME ACL";
1517 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1521 Uunlink(spool_name);
1522 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1524 #ifdef EXPERIMENTAL_DCC
1529 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1530 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1531 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1533 message_id[0] = 0; /* Indicate no message accepted */
1534 return FALSE; /* Cause skip to end of receive function */
1540 #endif /* WITH_CONTENT_SCAN */
1545 received_header_gen(void)
1548 uschar * timestamp = expand_string(US"${tod_full}");
1549 header_line * received_header= header_list;
1551 if (recipients_count == 1) received_for = recipients_list[0].address;
1552 received = expand_string(received_header_text);
1553 received_for = NULL;
1557 if(spool_name[0] != 0)
1558 Uunlink(spool_name); /* Lose the data file */
1559 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1560 "(received_header_text) failed: %s", string_printing(received_header_text),
1561 expand_string_message);
1564 /* The first element on the header chain is reserved for the Received header,
1565 so all we have to do is fill in the text pointer, and set the type. However, if
1566 the result of the expansion is an empty string, we leave the header marked as
1567 "old" so as to refrain from adding a Received header. */
1571 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1572 received_header->type = htype_old;
1576 received_header->text = string_sprintf("%s;\n\t%s\n", received, timestamp);
1577 received_header->type = htype_received;
1580 received_header->slen = Ustrlen(received_header->text);
1582 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1583 received_header->type, received_header->text);
1588 /*************************************************
1590 *************************************************/
1592 /* Receive a message on the given input, and put it into a pair of spool files.
1593 Either a non-null list of recipients, or the extract flag will be true, or
1594 both. The flag sender_local is true for locally generated messages. The flag
1595 submission_mode is true if an ACL has obeyed "control = submission". The flag
1596 suppress_local_fixups is true if an ACL has obeyed "control =
1597 suppress_local_fixups" or -G was passed on the command-line.
1598 The flag smtp_input is true if the message is to be
1599 handled using SMTP conventions about termination and lines starting with dots.
1600 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1602 If a message was successfully read, message_id[0] will be non-zero.
1604 The general actions of this function are:
1606 . Read the headers of the message (if any) into a chain of store
1609 . If there is a "sender:" header and the message is locally originated,
1610 throw it away, unless the caller is trusted, or unless
1611 active_local_sender_retain is set - which can only happen if
1612 active_local_from_check is false.
1614 . If recipients are to be extracted from the message, build the
1615 recipients list from the headers, removing any that were on the
1616 original recipients list (unless extract_addresses_remove_arguments is
1617 false), and at the same time, remove any bcc header that may be present.
1619 . Get the spool file for the data, sort out its unique name, open
1620 and lock it (but don't give it the name yet).
1622 . Generate a "Message-Id" header if the message doesn't have one, for
1623 locally-originated messages.
1625 . Generate a "Received" header.
1627 . Ensure the recipients list is fully qualified and rewritten if necessary.
1629 . If there are any rewriting rules, apply them to the sender address
1630 and also to the headers.
1632 . If there is no from: header, generate one, for locally-generated messages
1633 and messages in "submission mode" only.
1635 . If the sender is local, check that from: is correct, and if not, generate
1636 a Sender: header, unless message comes from a trusted caller, or this
1637 feature is disabled by active_local_from_check being false.
1639 . If there is no "date" header, generate one, for locally-originated
1640 or submission mode messages only.
1642 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1643 dot_ends mode, to the data file. Leave it open, to hold the lock.
1645 . Write the envelope and the headers to a new file.
1647 . Set the name for the header file; close it.
1649 . Set the name for the data file; close it.
1651 Because this function can potentially be called many times in a single
1652 SMTP connection, all store should be got by store_get(), so that it will be
1653 automatically retrieved after the message is accepted.
1655 FUDGE: It seems that sites on the net send out messages with just LF
1656 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1657 we make the CRs optional in all cases.
1659 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1660 new regime is now in place in which bare CRs in header lines are turned into LF
1661 followed by a space, so as not to terminate the header line.
1663 February 2004: A bare LF in a header line in a message whose first line was
1664 terminated by CRLF is treated in the same way as a bare CR.
1667 extract_recip TRUE if recipients are to be extracted from the message's
1670 Returns: TRUE there are more messages to be read (SMTP input)
1671 FALSE there are no more messages to be read (non-SMTP input
1672 or SMTP connection collapsed, or other failure)
1674 When reading a message for filter testing, the returned value indicates
1675 whether the headers (which is all that is read) were terminated by '.' or
1679 receive_msg(BOOL extract_recip)
1683 int process_info_len = Ustrlen(process_info);
1684 int error_rc = error_handling == ERRORS_SENDER
1685 ? errors_sender_rc : EXIT_FAILURE;
1686 int header_size = 256;
1688 int prevlines_length = 0;
1689 const int id_resolution = BASE_62 == 62 ? 5000 : 10000;
1693 BOOL contains_resent_headers = FALSE;
1694 BOOL extracted_ignored = FALSE;
1695 BOOL first_line_ended_crlf = TRUE_UNSET;
1696 BOOL smtp_yield = TRUE;
1699 BOOL resents_exist = FALSE;
1700 uschar *resent_prefix = US"";
1701 uschar *blackholed_by = NULL;
1702 uschar *blackhole_log_msg = US"";
1703 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1706 error_block *bad_addresses = NULL;
1708 uschar *frozen_by = NULL;
1709 uschar *queued_by = NULL;
1712 rmark rcvd_log_reset_point;
1714 struct stat statbuf;
1716 /* Final message to give to SMTP caller, and messages from ACLs */
1718 uschar *smtp_reply = NULL;
1719 uschar *user_msg, *log_msg;
1721 /* Working header pointers */
1726 /* Flags for noting the existence of certain headers (only one left) */
1728 BOOL date_header_exists = FALSE;
1730 /* Pointers to receive the addresses of headers whose contents we need. */
1732 header_line *from_header = NULL;
1733 header_line *subject_header = NULL;
1734 header_line *msgid_header = NULL;
1735 header_line *received_header;
1736 BOOL msgid_header_newly_created = FALSE;
1738 /* Variables for use when building the Received: header. */
1743 /* Time of creation of message_id */
1745 static struct timeval message_id_tv = { 0, 0 };
1748 /* Release any open files that might have been cached while preparing to
1749 accept the message - e.g. by verifying addresses - because reading a message
1750 might take a fair bit of real time. */
1754 /* Extracting the recipient list from an input file is incompatible with
1755 cutthrough delivery with the no-spool option. It shouldn't be possible
1756 to set up the combination, but just in case kill any ongoing connection. */
1757 if (extract_recip || !smtp_input)
1758 cancel_cutthrough_connection(TRUE, US"not smtp input");
1760 /* Initialize the chain of headers by setting up a place-holder for Received:
1761 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1762 pointing to the end of the chain to make adding headers simple. */
1764 received_header = header_list = header_last = store_get(sizeof(header_line), GET_UNTAINTED);
1765 header_list->next = NULL;
1766 header_list->type = htype_old;
1767 header_list->text = NULL;
1768 header_list->slen = 0;
1770 /* Control block for the next header to be read.
1771 The data comes from the message, so is tainted. */
1773 reset_point = store_mark();
1774 next = store_get(sizeof(header_line), GET_UNTAINTED);
1775 next->text = store_get(header_size, GET_TAINTED);
1777 /* Initialize message id to be null (indicating no message read), and the
1778 header names list to be the normal list. Indicate there is no data file open
1779 yet, initialize the size and warning count, and deal with no size limit. */
1782 spool_data_file = NULL;
1787 received_count = 1; /* For the one we will add */
1789 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1791 /* While reading the message, the following counts are computed. */
1793 message_linecount = body_linecount = body_zerocount =
1794 max_received_linelength = 0;
1796 #ifdef WITH_CONTENT_SCAN
1797 /* reset non-per-part mime variables */
1798 mime_is_coverletter = 0;
1800 mime_part_count = -1;
1803 #ifndef DISABLE_DKIM
1804 /* Call into DKIM to set up the context. In CHUNKING mode
1805 we clear the dot-stuffing flag */
1806 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1807 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1810 #ifdef SUPPORT_DMARC
1811 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1814 /* In SMTP sessions we may receive several messages in one connection. Before
1815 each subsequent one, we wait for the clock to tick at the level of message-id
1817 This is so that the combination of time+pid is unique, even on systems where the
1818 pid can be re-used within our time interval. We can't shorten the interval
1819 without re-designing the message-id. See comments above where the message id is
1820 created. This is Something For The Future.
1821 Do this wait any time we have previously created a message-id, even if we
1822 rejected the message. This gives unique IDs for logging done by ACLs.
1823 The initial timestamp must have been obtained via exim_gettime() to avoid
1824 issues on Linux with suspend/resume. */
1826 if (message_id_tv.tv_sec)
1828 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
1829 exim_wait_tick(&message_id_tv, id_resolution);
1832 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1833 ids, and fractions of a second are required. See the comments that precede the
1834 message id creation below.
1835 We use a routine that if possible uses a monotonic clock, and can be used again
1836 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1839 exim_gettime(&message_id_tv);
1841 /* For other uses of the received time we can operate with granularity of one
1842 second, and for that we use the global variable received_time. This is for
1843 things like ultimate message timeouts.
1844 For this we do not care about the Linux suspend/resume problem, so rather than
1845 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1847 gettimeofday(&received_time, NULL);
1849 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1850 happen in the smtp_getc() function when it refills its buffer. */
1852 had_data_timeout = 0;
1854 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1856 /* If not SMTP input, timeout happens only if configured, and we just set a
1857 single timeout for the whole message. */
1859 else if (receive_timeout > 0)
1861 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1862 ALARM(receive_timeout);
1865 /* SIGTERM and SIGINT are caught always. */
1867 had_data_sigint = 0;
1868 signal(SIGTERM, data_sigterm_sigint_handler);
1869 signal(SIGINT, data_sigterm_sigint_handler);
1871 /* Header lines in messages are not supposed to be very long, though when
1872 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1873 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1874 storing the header, and extend this as necessary using string_cat().
1876 To cope with total lunacies, impose an upper limit on the length of the header
1877 section of the message, as otherwise the store will fill up. We must also cope
1878 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1879 Folded header lines are joined into one string, leaving the '\n' characters
1880 inside them, so that writing them out reproduces the input.
1882 Loop for each character of each header; the next structure for chaining the
1883 header is set up already, with ptr the offset of the next character in
1888 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1890 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1891 SMTP must have a correct "." terminator. */
1893 if (smtp_input /* && !smtp_batched_input */)
1896 smtp_reply = handle_lost_connection(US" (header)");
1898 goto TIDYUP; /* Skip to end of function */
1903 /* See if we are at the current header's size limit - there must be at least
1904 four bytes left. This allows for the new character plus a zero, plus two for
1905 extra insertions when we are playing games with dots and carriage returns. If
1906 we are at the limit, extend the text buffer. This could have been done
1907 automatically using string_cat() but because this is a tightish loop storing
1908 only one character at a time, we choose to do it inline. Normally
1909 store_extend() will be able to extend the block; only at the end of a big
1910 store block will a copy be needed. To handle the case of very long headers
1911 (and sometimes lunatic messages can have ones that are 100s of K long) we
1912 call store_release() for strings that have been copied - if the string is at
1913 the start of a block (and therefore the only thing in it, because we aren't
1914 doing any other gets), the block gets freed. We can only do this release if
1915 there were no allocations since the once that we want to free. */
1917 if (ptr >= header_size - 4)
1919 int oldsize = header_size;
1921 if (header_size >= INT_MAX/2)
1925 if (!store_extend(next->text, oldsize, header_size))
1926 next->text = store_newblock(next->text, header_size, ptr);
1929 /* Cope with receiving a binary zero. There is dispute about whether
1930 these should be allowed in RFC 822 messages. The middle view is that they
1931 should not be allowed in headers, at least. Exim takes this attitude at
1932 the moment. We can't just stomp on them here, because we don't know that
1933 this line is a header yet. Set a flag to cause scanning later. */
1935 if (ch == 0) had_zero++;
1937 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1938 those from data files use just LF. Treat LF in local SMTP input as a
1939 terminator too. Treat EOF as a line terminator always. */
1941 if (ch < 0) goto EOL;
1943 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1944 other MTAs accept this. We are therefore forced into this "liberalisation"
1945 too, so we accept LF as a line terminator whatever the source of the message.
1946 However, if the first line of the message ended with a CRLF, we treat a bare
1947 LF specially by inserting a white space after it to ensure that the header
1948 line is not terminated. */
1952 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1953 else if (first_line_ended_crlf) receive_ungetc(' ');
1957 /* This is not the end of the line. If this is SMTP input and this is
1958 the first character in the line and it is a "." character, ignore it.
1959 This implements the dot-doubling rule, though header lines starting with
1960 dots aren't exactly common. They are legal in RFC 822, though. If the
1961 following is CRLF or LF, this is the line that that terminates the
1962 entire message. We set message_ended to indicate this has happened (to
1963 prevent further reading), and break out of the loop, having freed the
1964 empty header, and set next = NULL to indicate no data line. */
1966 if (f.dot_ends && ptr == 0 && ch == '.')
1968 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1971 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1974 if (ch >= 0) receive_ungetc(ch);
1975 ch = '\r'; /* Revert to CR */
1980 message_ended = END_DOT;
1981 reset_point = store_reset(reset_point);
1983 break; /* End character-reading loop */
1986 /* For non-SMTP input, the dot at the start of the line was really a data
1987 character. What is now in ch is the following character. We guaranteed
1988 enough space for this above. */
1992 next->text[ptr++] = '.';
1997 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1998 remember this case if this is the first line ending. */
2002 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2005 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
2009 /* Otherwise, put back the character after CR, and turn the bare CR
2012 if (ch >= 0) (receive_ungetc)(ch);
2013 next->text[ptr++] = '\n';
2018 /* We have a data character for the header line. */
2020 next->text[ptr++] = ch; /* Add to buffer */
2021 message_size++; /* Total message size so far */
2023 /* Handle failure due to a humungously long header section. The >= allows
2024 for the terminating \n. Add what we have so far onto the headers list so
2025 that it gets reflected in any error message, and back up the just-read
2028 if (message_size >= header_maxsize)
2031 next->text[ptr] = 0;
2033 next->type = htype_other;
2035 header_last->next = next;
2038 log_write(0, LOG_MAIN, "ridiculously long message header received from "
2039 "%s (more than %d characters): message abandoned",
2040 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
2044 smtp_reply = US"552 Message header is ridiculously long";
2045 receive_swallow_smtp();
2046 goto TIDYUP; /* Skip to end of function */
2051 give_local_error(ERRMESS_VLONGHEADER,
2052 string_sprintf("message header longer than %d characters received: "
2053 "message not accepted", header_maxsize), US"", error_rc, stdin,
2055 /* Does not return */
2059 continue; /* With next input character */
2061 /* End of header line reached */
2065 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2067 receive_linecount++;
2068 message_linecount++;
2070 /* Keep track of maximum line length */
2072 if (ptr - prevlines_length > max_received_linelength)
2073 max_received_linelength = ptr - prevlines_length;
2074 prevlines_length = ptr + 1;
2076 /* Now put in the terminating newline. There is always space for
2077 at least two more characters. */
2079 next->text[ptr++] = '\n';
2082 /* A blank line signals the end of the headers; release the unwanted
2083 space and set next to NULL to indicate this. */
2087 reset_point = store_reset(reset_point);
2092 /* There is data in the line; see if the next input character is a
2093 whitespace character. If it is, we have a continuation of this header line.
2094 There is always space for at least one character at this point. */
2098 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2099 if (nextch == ' ' || nextch == '\t')
2101 next->text[ptr++] = nextch;
2102 if (++message_size >= header_maxsize)
2104 continue; /* Iterate the loop */
2106 else if (nextch >= 0) /* not EOF, ERR etc */
2107 (receive_ungetc)(nextch); /* For next time */
2108 else ch = nextch; /* Cause main loop to exit at end */
2111 /* We have got to the real line end. Terminate the string and release store
2112 beyond it. If it turns out to be a real header, internal binary zeros will
2113 be squashed later. */
2115 next->text[ptr] = 0;
2117 store_release_above(next->text + ptr + 1);
2119 /* Check the running total size against the overall message size limit. We
2120 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2121 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2122 headers - the code to read the body will then also hit the buffer. */
2124 if (message_size > thismessage_size_limit) break;
2126 /* A line that is not syntactically correct for a header also marks
2127 the end of the headers. In this case, we leave next containing the
2128 first data line. This might actually be several lines because of the
2129 continuation logic applied above, but that doesn't matter.
2131 It turns out that smail, and presumably sendmail, accept leading lines
2134 From ph10 Fri Jan 5 12:35 GMT 1996
2136 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2137 find any documentation of this, but for compatibility it had better be
2138 accepted. Exim restricts it to the case of non-smtp messages, and
2139 treats it as an alternative to the -f command line option. Thus it is
2140 ignored except for trusted users or filter testing. Otherwise it is taken
2141 as the sender address, unless -f was used (sendmail compatibility).
2143 It further turns out that some UUCPs generate the From_line in a different
2146 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2148 The regex for matching these things is now capable of recognizing both
2149 formats (including 2- and 4-digit years in the latter). In fact, the regex
2150 is now configurable, as is the expansion string to fish out the sender.
2152 Even further on it has been discovered that some broken clients send
2153 these lines in SMTP messages. There is now an option to ignore them from
2154 specified hosts or networks. Sigh. */
2156 if ( header_last == header_list
2158 || ( sender_host_address
2159 && verify_check_host(&ignore_fromline_hosts) == OK
2161 || (!sender_host_address && ignore_fromline_local)
2163 && regex_match_and_setup(regex_From, next->text, 0, -1)
2166 if (!f.sender_address_forced)
2168 uschar *uucp_sender = expand_string(uucp_from_sender);
2170 log_write(0, LOG_MAIN|LOG_PANIC,
2171 "expansion of \"%s\" failed after matching "
2172 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2175 int start, end, domain;
2177 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2178 &start, &end, &domain, TRUE);
2181 if (domain == 0 && newsender[0] != 0)
2182 /* deconst ok as newsender was not const */
2183 newsender = US rewrite_address_qualify(newsender, FALSE);
2185 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2187 sender_address = newsender;
2189 if (f.trusted_caller || filter_test != FTEST_NONE)
2191 authenticated_sender = NULL;
2192 originator_name = US"";
2193 f.sender_local = FALSE;
2196 if (filter_test != FTEST_NONE)
2197 printf("Sender taken from \"From \" line\n");
2204 /* Not a leading "From " line. Check to see if it is a valid header line.
2205 Header names may contain any non-control characters except space and colon,
2210 uschar * p = next->text;
2212 /* If not a valid header line, break from the header reading loop, leaving
2213 next != NULL, indicating that it holds the first line of the body. */
2215 if (isspace(*p)) break;
2216 while (mac_isgraph(*p) && *p != ':') p++;
2217 while (isspace(*p)) p++;
2220 body_zerocount = had_zero;
2224 /* We have a valid header line. If there were any binary zeroes in
2225 the line, stomp on them here. */
2228 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2231 /* It is perfectly legal to have an empty continuation line
2232 at the end of a header, but it is confusing to humans
2233 looking at such messages, since it looks like a blank line.
2234 Reduce confusion by removing redundant white space at the
2235 end. We know that there is at least one printing character
2236 (the ':' tested for above) so there is no danger of running
2239 p = next->text + ptr - 2;
2242 while (*p == ' ' || *p == '\t') p--;
2243 if (*p != '\n') break;
2244 ptr = (p--) - next->text + 1;
2245 message_size -= next->slen - ptr;
2246 next->text[ptr] = 0;
2250 /* Add the header to the chain */
2252 next->type = htype_other;
2254 header_last->next = next;
2257 /* Check the limit for individual line lengths. This comes after adding to
2258 the chain so that the failing line is reflected if a bounce is generated
2259 (for a local message). */
2261 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2263 log_write(0, LOG_MAIN, "overlong message header line received from "
2264 "%s (more than %d characters): message abandoned",
2265 f.sender_host_unknown ? sender_ident : sender_fullhost,
2266 header_line_maxsize);
2270 smtp_reply = US"552 A message header line is too long";
2271 receive_swallow_smtp();
2272 goto TIDYUP; /* Skip to end of function */
2276 give_local_error(ERRMESS_VLONGHDRLINE,
2277 string_sprintf("message header line longer than %d characters "
2278 "received: message not accepted", header_line_maxsize), US"",
2279 error_rc, stdin, header_list->next);
2280 /* Does not return */
2283 /* Note if any resent- fields exist. */
2285 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2287 resents_exist = TRUE;
2288 resent_prefix = US"Resent-";
2292 /* Reject CHUNKING messages that do not CRLF their first header line */
2294 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2296 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2297 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2299 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2300 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2301 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2304 goto TIDYUP; /* Skip to end of function */
2307 /* The line has been handled. If we have hit EOF, break out of the loop,
2308 indicating no pending data line and no more data for the message */
2313 if (ch == EOF) message_ended = END_DOT;
2314 else if (ch == ERR) message_ended = END_PROTOCOL;
2318 /* Set up for the next header */
2320 reset_point = store_mark();
2322 next = store_get(sizeof(header_line), GET_UNTAINTED);
2323 next->text = store_get(header_size, GET_TAINTED);
2326 prevlines_length = 0;
2327 } /* Continue, starting to read the next header */
2329 /* At this point, we have read all the headers into a data structure in main
2330 store. The first header is still the dummy placeholder for the Received: header
2331 we are going to generate a bit later on. If next != NULL, it contains the first
2332 data line - which terminated the headers before reaching a blank line (not the
2337 debug_printf(">>Headers received:\n");
2338 for (header_line * h = header_list->next; h; h = h->next)
2339 debug_printf("%s", h->text);
2343 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2344 is dropped immediately after valid headers, the next thing we will see is EOF.
2345 We must test for this specially, as further down the reading of the data is
2346 skipped if already at EOF.
2347 In CHUNKING mode, a protocol error makes us give up on the message. */
2350 if ((receive_feof)())
2352 smtp_reply = handle_lost_connection(US" (after header)");
2354 goto TIDYUP; /* Skip to end of function */
2356 else if (message_ended == END_PROTOCOL)
2358 smtp_reply = US""; /* no reply needed */
2362 /* If this is a filter test run and no headers were read, output a warning
2363 in case there is a mistake in the test message. */
2365 if (filter_test != FTEST_NONE && header_list->next == NULL)
2366 printf("Warning: no message headers read\n");
2369 /* Scan the headers to identify them. Some are merely marked for later
2370 processing; some are dealt with here. */
2372 for (header_line * h = header_list->next; h; h = h->next)
2374 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2375 if (is_resent) contains_resent_headers = TRUE;
2377 switch (header_checkname(h, is_resent))
2380 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2384 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2387 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2390 if (!resents_exist || is_resent) date_header_exists = TRUE;
2393 /* Same comments as about Return-Path: below. */
2395 case htype_delivery_date:
2396 if (delivery_date_remove) h->type = htype_old;
2399 /* Same comments as about Return-Path: below. */
2401 case htype_envelope_to:
2402 if (envelope_to_remove) h->type = htype_old;
2405 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2406 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2407 header consists of just the login id of the user who called Exim, rewrite
2408 it with the gecos field first. Apply this rule to Resent-From: if there
2409 are resent- fields. */
2412 h->type = htype_from;
2413 if (!resents_exist || is_resent)
2419 uschar *s = Ustrchr(h->text, ':') + 1;
2420 while (isspace(*s)) s++;
2421 len = h->slen - (s - h->text) - 1;
2422 if (Ustrlen(originator_login) == len &&
2423 strncmpic(s, originator_login, len) == 0)
2425 uschar *name = is_resent? US"Resent-From" : US"From";
2426 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2427 originator_login, qualify_domain_sender);
2428 from_header = header_last;
2429 h->type = htype_old;
2430 DEBUG(D_receive|D_rewrite)
2431 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2437 /* Identify the Message-id: header for generating "in-reply-to" in the
2438 autoreply transport. For incoming logging, save any resent- value. In both
2439 cases, take just the first of any multiples. */
2442 if (!msgid_header && (!resents_exist || is_resent))
2449 /* Flag all Received: headers */
2451 case htype_received:
2452 h->type = htype_received;
2456 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2458 case htype_reply_to:
2459 h->type = htype_reply_to;
2462 /* The Return-path: header is supposed to be added to messages when
2463 they leave the SMTP system. We shouldn't receive messages that already
2464 contain Return-path. However, since Exim generates Return-path: on
2465 local delivery, resent messages may well contain it. We therefore
2466 provide an option (which defaults on) to remove any Return-path: headers
2467 on input. Removal actually means flagging as "old", which prevents the
2468 header being transmitted with the message. */
2470 case htype_return_path:
2471 if (return_path_remove) h->type = htype_old;
2473 /* If we are testing a mail filter file, use the value of the
2474 Return-Path: header to set up the return_path variable, which is not
2475 otherwise set. However, remove any <> that surround the address
2476 because the variable doesn't have these. */
2478 if (filter_test != FTEST_NONE)
2480 uschar *start = h->text + 12;
2481 uschar *end = start + Ustrlen(start);
2482 while (isspace(*start)) start++;
2483 while (end > start && isspace(end[-1])) end--;
2484 if (*start == '<' && end[-1] == '>')
2489 return_path = string_copyn(start, end - start);
2490 printf("Return-path taken from \"Return-path:\" header line\n");
2494 /* If there is a "Sender:" header and the message is locally originated,
2495 and from an untrusted caller and suppress_local_fixups is not set, or if we
2496 are in submission mode for a remote message, mark it "old" so that it will
2497 not be transmitted with the message, unless active_local_sender_retain is
2498 set. (This can only be true if active_local_from_check is false.) If there
2499 are any resent- headers in the message, apply this rule to Resent-Sender:
2500 instead of Sender:. Messages with multiple resent- header sets cannot be
2501 tidily handled. (For this reason, at least one MUA - Pine - turns old
2502 resent- headers into X-resent- headers when resending, leaving just one
2506 h->type = !f.active_local_sender_retain
2507 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2508 || f.submission_mode
2510 && (!resents_exist || is_resent)
2511 ? htype_old : htype_sender;
2514 /* Remember the Subject: header for logging. There is no Resent-Subject */
2520 /* "To:" gets flagged, and the existence of a recipient header is noted,
2521 whether it's resent- or not. */
2526 to_or_cc_header_exists = TRUE;
2532 /* Extract recipients from the headers if that is required (the -t option).
2533 Note that this is documented as being done *before* any address rewriting takes
2534 place. There are two possibilities:
2536 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2537 recipients already listed are to be REMOVED from the message. Smail 3 works
2538 like this. We need to build a non-recipients tree for that list, because in
2539 subsequent processing this data is held in a tree and that's what the
2540 spool_write_header() function expects. Make sure that non-recipient addresses
2541 are fully qualified and rewritten if necessary.
2543 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2544 those in the command line arguments (and it is rumoured some other MTAs do
2545 this). Therefore, there is an option to make Exim behave this way.
2547 *** Notes on "Resent-" header lines ***
2549 The presence of resent-headers in the message makes -t horribly ambiguous.
2550 Experiments with sendmail showed that it uses recipients for all resent-
2551 headers, totally ignoring the concept of "sets of resent- headers" as described
2552 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2553 with all the addresses in one instance of each header.
2555 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2556 error for -t if there were resent- headers in the message. However, after a
2557 discussion on the mailing list, I've learned that there are MUAs that use
2558 resent- headers with -t, and also that the stuff about sets of resent- headers
2559 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2560 message with -t and resent- header lines makes sure that only *its* resent-
2561 headers are present; previous ones are often renamed as X-resent- for example.
2563 Consequently, Exim has been changed so that, if any resent- header lines are
2564 present, the recipients are taken from all of the appropriate resent- lines,
2565 and not from the ordinary To:, Cc:, etc. */
2570 error_block **bnext = &bad_addresses;
2572 if (extract_addresses_remove_arguments)
2574 while (recipients_count-- > 0)
2576 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2577 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2578 tree_add_nonrecipient(s);
2580 recipients_list = NULL;
2581 recipients_count = recipients_list_max = 0;
2584 /* Now scan the headers */
2586 for (header_line * h = header_list->next; h; h = h->next)
2588 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2589 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2591 uschar *s = Ustrchr(h->text, ':') + 1;
2592 while (isspace(*s)) s++;
2594 f.parse_allow_group = TRUE; /* Allow address group syntax */
2598 uschar *ss = parse_find_address_end(s, FALSE);
2599 uschar *recipient, *errmess, *pp;
2600 int start, end, domain;
2602 /* Check on maximum */
2604 if (recipients_max > 0 && ++rcount > recipients_max)
2605 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2606 US"message rejected: ", error_rc, stdin, NULL);
2607 /* Does not return */
2609 /* Make a copy of the address, and remove any internal newlines. These
2610 may be present as a result of continuations of the header line. The
2611 white space that follows the newline must not be removed - it is part
2614 pp = recipient = store_get(ss - s + 1, s);
2615 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2620 BOOL b = allow_utf8_domains;
2621 allow_utf8_domains = TRUE;
2623 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2628 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2629 else allow_utf8_domains = b;
2635 /* Keep a list of all the bad addresses so we can send a single
2636 error message at the end. However, an empty address is not an error;
2637 just ignore it. This can come from an empty group list like
2639 To: Recipients of list:;
2641 If there are no recipients at all, an error will occur later. */
2643 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2645 int len = Ustrlen(s);
2646 error_block * b = store_get(sizeof(error_block), GET_UNTAINTED);
2647 while (len > 0 && isspace(s[len-1])) len--;
2649 b->text1 = string_printing(string_copyn(s, len));
2655 /* If the recipient is already in the nonrecipients tree, it must
2656 have appeared on the command line with the option extract_addresses_
2657 remove_arguments set. Do not add it to the recipients, and keep a note
2658 that this has happened, in order to give a better error if there are
2659 no recipients left. */
2661 else if (recipient != NULL)
2663 if (tree_search(tree_nonrecipients, recipient) == NULL)
2664 receive_add_recipient(recipient, -1);
2666 extracted_ignored = TRUE;
2669 /* Move on past this address */
2671 s = ss + (*ss? 1:0);
2672 while (isspace(*s)) s++;
2673 } /* Next address */
2675 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2676 f.parse_found_group = FALSE;
2678 /* If this was the bcc: header, mark it "old", which means it
2679 will be kept on the spool, but not transmitted as part of the
2682 if (h->type == htype_bcc) h->type = htype_old;
2683 } /* For appropriate header line */
2684 } /* For each header line */
2688 /* Now build the unique message id. This has changed several times over the
2689 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2690 Retaining all the history in the comment has become too unwieldy - read
2691 previous release sources if you want it.
2693 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2694 The first part is the current time, in seconds. The second part is the current
2695 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2696 can hold a number in the range 0-3843. It used to be a computed sequence
2697 number, but is now the fractional component of the current time in units of
2698 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2699 received, Exim ensures that the timer has ticked at the appropriate level
2700 before proceeding, to avoid duplication if the pid happened to be re-used
2701 within the same time period. It seems likely that most messages will take at
2702 least half a millisecond to be received, so no delay will normally be
2703 necessary. At least for some time...
2705 There is a modification when localhost_number is set. Formerly this was allowed
2706 to be as large as 255. Now it is restricted to the range 0-16, and the final
2707 component of the message id becomes (localhost_number * 200) + fractional time
2708 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2710 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2711 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2712 still allows the tttttt field to hold a large enough number to last for some
2713 more decades, and the final two-digit field can hold numbers up to 1295, which
2714 is enough for milliseconds (instead of 1/2000 of a second).
2716 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2717 pid, so it is probably safe because pids have to be positive. The
2718 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2719 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2721 Note that string_base62() returns its data in a static storage block, so it
2722 must be copied before calling string_base62() again. It always returns exactly
2725 There doesn't seem to be anything in the RFC which requires a message id to
2726 start with a letter, but Smail was changed to ensure this. The external form of
2727 the message id (as supplied by string expansion) therefore starts with an
2728 additional leading 'E'. The spool file names do not include this leading
2729 letter and it is not used internally.
2731 NOTE: If ever the format of message ids is changed, the regular expression for
2732 checking that a string is in this format must be updated in a corresponding
2733 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2734 must also be changed to reflect the correct string length. The queue-sort code
2735 needs to know the layout. Then, of course, other programs that rely on the
2736 message id format will need updating too. */
2738 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2739 message_id[6] = '-';
2740 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2742 /* Deal with the case where the host number is set. The value of the number was
2743 checked when it was read, to ensure it isn't too big. */
2745 if (host_number_string)
2746 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2747 string_base62((long int)(
2748 host_number * (1000000/id_resolution) +
2749 message_id_tv.tv_usec/id_resolution)) + 4);
2751 /* Host number not set: final field is just the fractional time at an
2752 appropriate resolution. */
2755 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2756 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2758 /* Add the current message id onto the current process info string if
2761 (void)string_format(process_info + process_info_len,
2762 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2764 /* If we are using multiple input directories, set up the one for this message
2765 to be the least significant base-62 digit of the time of arrival. Otherwise
2766 ensure that it is an empty string. */
2768 set_subdir_str(message_subdir, message_id, 0);
2770 /* Now that we have the message-id, if there is no message-id: header, generate
2771 one, but only for local (without suppress_local_fixups) or submission mode
2772 messages. This can be user-configured if required, but we had better flatten
2773 any illegal characters therein. */
2776 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2778 uschar *id_text = US"";
2779 uschar *id_domain = primary_hostname;
2782 /* Permit only letters, digits, dots, and hyphens in the domain */
2784 if (message_id_domain)
2786 uschar *new_id_domain = expand_string(message_id_domain);
2789 if (!f.expand_string_forcedfail)
2790 log_write(0, LOG_MAIN|LOG_PANIC,
2791 "expansion of \"%s\" (message_id_header_domain) "
2792 "failed: %s", message_id_domain, expand_string_message);
2794 else if (*new_id_domain)
2796 id_domain = new_id_domain;
2797 for (uschar * p = id_domain; *p; p++)
2798 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2802 /* Permit all characters except controls and RFC 2822 specials in the
2803 additional text part. */
2805 if (message_id_text)
2807 uschar *new_id_text = expand_string(message_id_text);
2810 if (!f.expand_string_forcedfail)
2811 log_write(0, LOG_MAIN|LOG_PANIC,
2812 "expansion of \"%s\" (message_id_header_text) "
2813 "failed: %s", message_id_text, expand_string_message);
2815 else if (*new_id_text)
2817 id_text = new_id_text;
2818 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2822 /* Add the header line.
2823 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2824 appended, to preserve classical expectations of header ordering. */
2826 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2827 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2828 *id_text == 0 ? "" : ".", id_text, id_domain);
2830 /* Arrange for newly-created Message-Id to be logged */
2834 msgid_header_newly_created = TRUE;
2839 /* If we are to log recipients, keep a copy of the raw ones before any possible
2840 rewriting. Must copy the count, because later ACLs and the local_scan()
2841 function may mess with the real recipients. */
2843 if (LOGGING(received_recipients))
2845 raw_recipients = store_get(recipients_count * sizeof(uschar *), GET_UNTAINTED);
2846 for (int i = 0; i < recipients_count; i++)
2847 raw_recipients[i] = string_copy(recipients_list[i].address);
2848 raw_recipients_count = recipients_count;
2851 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2852 recipients will get here only if the conditions were right (allow_unqualified_
2853 recipient is TRUE). */
2856 { debug_printf_indent("qualify & rewrite recipients list\n"); acl_level++; }
2857 for (int i = 0; i < recipients_count; i++)
2858 recipients_list[i].address = /* deconst ok as src was not cont */
2859 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2860 global_rewrite_rules, rewrite_existflags);
2861 DEBUG(D_rewrite) acl_level--;
2863 /* If there is no From: header, generate one for local (without
2864 suppress_local_fixups) or submission_mode messages. If there is no sender
2865 address, but the sender is local or this is a local delivery error, use the
2866 originator login. This shouldn't happen for genuine bounces, but might happen
2867 for autoreplies. The addition of From: must be done *before* checking for the
2868 possible addition of a Sender: header, because untrusted_set_sender allows an
2869 untrusted user to set anything in the envelope (which might then get info
2870 From:) but we still want to ensure a valid Sender: if it is required. */
2873 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2875 const uschar * oname = US"";
2877 /* Use the originator_name if this is a locally submitted message and the
2878 caller is not trusted. For trusted callers, use it only if -F was used to
2879 force its value or if we have a non-SMTP message for which -f was not used
2880 to set the sender. */
2882 if (!sender_host_address)
2884 if (!f.trusted_caller || f.sender_name_forced ||
2885 (!smtp_input && !f.sender_address_forced))
2886 oname = originator_name;
2889 /* For non-locally submitted messages, the only time we use the originator
2890 name is when it was forced by the /name= option on control=submission. */
2892 else if (submission_name) oname = submission_name;
2894 /* Envelope sender is empty */
2896 if (!*sender_address)
2898 uschar *fromstart, *fromend;
2900 fromstart = string_sprintf("%sFrom: %s%s",
2901 resent_prefix, oname, *oname ? " <" : "");
2902 fromend = *oname ? US">" : US"";
2904 if (f.sender_local || f.local_error_message)
2905 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2906 local_part_quote(originator_login), qualify_domain_sender,
2909 else if (f.submission_mode && authenticated_id)
2911 if (!submission_domain)
2912 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2913 local_part_quote(authenticated_id), qualify_domain_sender,
2916 else if (!*submission_domain) /* empty => whole address set */
2917 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2921 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2922 local_part_quote(authenticated_id), submission_domain, fromend);
2924 from_header = header_last; /* To get it checked for Sender: */
2928 /* There is a non-null envelope sender. Build the header using the original
2929 sender address, before any rewriting that might have been done while
2934 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2937 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2940 from_header = header_last; /* To get it checked for Sender: */
2945 /* If the sender is local (without suppress_local_fixups), or if we are in
2946 submission mode and there is an authenticated_id, check that an existing From:
2947 is correct, and if not, generate a Sender: header, unless disabled. Any
2948 previously-existing Sender: header was removed above. Note that sender_local,
2949 as well as being TRUE if the caller of exim is not trusted, is also true if a
2950 trusted caller did not supply a -f argument for non-smtp input. To allow
2951 trusted callers to forge From: without supplying -f, we have to test explicitly
2952 here. If the From: header contains more than one address, then the call to
2953 parse_extract_address fails, and a Sender: header is inserted, as required. */
2956 && ( f.active_local_from_check
2957 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2958 || f.submission_mode && authenticated_id
2961 BOOL make_sender = TRUE;
2962 int start, end, domain;
2964 uschar *from_address =
2965 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2966 &start, &end, &domain, FALSE);
2967 uschar *generated_sender_address;
2969 generated_sender_address = f.submission_mode
2970 ? !submission_domain
2971 ? string_sprintf("%s@%s",
2972 local_part_quote(authenticated_id), qualify_domain_sender)
2973 : !*submission_domain /* empty => full address */
2974 ? string_sprintf("%s", authenticated_id)
2975 : string_sprintf("%s@%s",
2976 local_part_quote(authenticated_id), submission_domain)
2977 : string_sprintf("%s@%s",
2978 local_part_quote(originator_login), qualify_domain_sender);
2980 /* Remove permitted prefixes and suffixes from the local part of the From:
2981 address before doing the comparison with the generated sender. */
2986 uschar *at = domain ? from_address + domain - 1 : NULL;
2989 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2990 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2992 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2993 from_address += slen;
2997 if ( strcmpic(generated_sender_address, from_address) == 0
2998 || (!domain && strcmpic(from_address, originator_login) == 0))
2999 make_sender = FALSE;
3002 /* We have to cause the Sender header to be rewritten if there are
3003 appropriate rewriting rules. */
3006 if (f.submission_mode && !submission_name)
3007 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
3008 generated_sender_address);
3010 header_add(htype_sender, "%sSender: %s <%s>\n",
3012 f.submission_mode ? submission_name : originator_name,
3013 generated_sender_address);
3015 /* Ensure that a non-null envelope sender address corresponds to the
3016 submission mode sender address. */
3018 if (f.submission_mode && *sender_address)
3020 if (!sender_address_unrewritten)
3021 sender_address_unrewritten = sender_address;
3022 sender_address = generated_sender_address;
3023 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
3024 log_write(L_address_rewrite, LOG_MAIN,
3025 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
3026 sender_address_unrewritten, generated_sender_address);
3030 /* If there are any rewriting rules, apply them to the sender address, unless
3031 it has already been rewritten as part of verification for SMTP input. */
3034 { debug_printf("global rewrite rules\n"); acl_level++; }
3035 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
3037 /* deconst ok as src was not const */
3038 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
3039 global_rewrite_rules, rewrite_existflags);
3040 DEBUG(D_receive|D_rewrite)
3041 debug_printf("rewritten sender = %s\n", sender_address);
3043 DEBUG(D_rewrite) acl_level--;
3046 /* The headers must be run through rewrite_header(), because it ensures that
3047 addresses are fully qualified, as well as applying any rewriting rules that may
3050 Qualification of header addresses in a message from a remote host happens only
3051 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
3052 appropriate. For local messages, qualification always happens, unless -bnq is
3053 used to explicitly suppress it. No rewriting is done for an unqualified address
3054 that is left untouched.
3056 We start at the second header, skipping our own Received:. This rewriting is
3057 documented as happening *after* recipient addresses are taken from the headers
3058 by the -t command line option. An added Sender: gets rewritten here. */
3061 { debug_printf("rewrite headers\n"); acl_level++; }
3062 for (header_line * h = header_list->next, * newh; h; h = h->next)
3063 if ((newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3064 rewrite_existflags, TRUE)))
3066 DEBUG(D_rewrite) acl_level--;
3069 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3070 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3071 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3072 exists, this applies to the set of resent- headers rather than the normal set.
3074 The requirement for a recipient header has been removed in RFC 2822. At this
3075 point in the code, earlier versions of Exim added a To: header for locally
3076 submitted messages, and an empty Bcc: header for others. In the light of the
3077 changes in RFC 2822, this was dropped in November 2003. */
3080 /* If there is no date header, generate one if the message originates locally
3081 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3082 submission mode flag is set. Messages without Date: are not valid, but it seems
3083 to be more confusing if Exim adds one to all remotely-originated messages.
3084 As per Message-Id, we prepend if resending, else append.
3087 if ( !date_header_exists
3088 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3089 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3090 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3092 search_tidyup(); /* Free any cached resources */
3094 /* Show the complete set of headers if debugging. Note that the first one (the
3095 new Received:) has not yet been set. */
3099 debug_printf(">>Headers after rewriting and local additions:\n");
3100 for (header_line * h = header_list->next; h; h = h->next)
3101 debug_printf("%c %s", h->type, h->text);
3105 /* The headers are now complete in store. If we are running in filter
3106 testing mode, that is all this function does. Return TRUE if the message
3107 ended with a dot. */
3109 if (filter_test != FTEST_NONE)
3111 process_info[process_info_len] = 0;
3112 return message_ended == END_DOT;
3115 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3116 think more if it could be handled. Cannot do onward CHUNKING unless
3117 inbound is, but inbound chunking ought to be ok with outbound plain.
3118 Could we do onward CHUNKING given inbound CHUNKING?
3120 if (chunking_state > CHUNKING_OFFERED)
3121 cancel_cutthrough_connection(FALSE, US"chunking active");
3123 /* Cutthrough delivery:
3124 We have to create the Received header now rather than at the end of reception,
3125 so the timestamp behaviour is a change to the normal case.
3126 Having created it, send the headers to the destination. */
3128 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3130 if (received_count > received_headers_max)
3132 cancel_cutthrough_connection(TRUE, US"too many headers");
3133 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3134 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3135 "Too many \"Received\" headers",
3137 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3138 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3139 message_id[0] = 0; /* Indicate no message accepted */
3140 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3141 goto TIDYUP; /* Skip to end of function */
3143 received_header_gen();
3144 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3145 (void) cutthrough_headers_send();
3149 /* Open a new spool file for the data portion of the message. We need
3150 to access it both via a file descriptor and a stream. Try to make the
3151 directory if it isn't there. */
3153 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3154 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3156 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3158 if (errno == ENOENT)
3160 (void) directory_make(spool_directory,
3161 spool_sname(US"input", message_subdir),
3162 INPUT_DIRECTORY_MODE, TRUE);
3163 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3166 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3167 spool_name, strerror(errno));
3170 /* Make sure the file's group is the Exim gid, and double-check the mode
3171 because the group setting doesn't always get set automatically. */
3173 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3174 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3175 "Failed setting ownership on spool file %s: %s",
3176 spool_name, strerror(errno));
3177 (void)fchmod(data_fd, SPOOL_MODE);
3179 /* We now have data file open. Build a stream for it and lock it. We lock only
3180 the first line of the file (containing the message ID) because otherwise there
3181 are problems when Exim is run under Cygwin (I'm told). See comments in
3182 spool_in.c, where the same locking is done. */
3184 spool_data_file = fdopen(data_fd, "w+");
3185 lock_data.l_type = F_WRLCK;
3186 lock_data.l_whence = SEEK_SET;
3187 lock_data.l_start = 0;
3188 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3190 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3191 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3192 errno, strerror(errno));
3194 /* We have an open, locked data file. Write the message id to it to make it
3195 self-identifying. Then read the remainder of the input of this message and
3196 write it to the data file. If the variable next != NULL, it contains the first
3197 data line (which was read as a header but then turned out not to have the right
3198 format); write it (remembering that it might contain binary zeros). The result
3199 of fwrite() isn't inspected; instead we call ferror() below. */
3201 fprintf(spool_data_file, "%s-D\n", message_id);
3204 uschar *s = next->text;
3205 int len = next->slen;
3206 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3207 body_linecount++; /* Assumes only 1 line */
3210 /* Note that we might already be at end of file, or the logical end of file
3211 (indicated by '.'), or might have encountered an error while writing the
3212 message id or "next" line. */
3214 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3218 message_ended = chunking_state <= CHUNKING_OFFERED
3219 ? read_message_data_smtp(spool_data_file)
3221 ? read_message_bdat_smtp_wire(spool_data_file)
3222 : read_message_bdat_smtp(spool_data_file);
3223 receive_linecount++; /* The terminating "." line */
3226 message_ended = read_message_data(spool_data_file);
3228 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3229 message_linecount += body_linecount;
3231 switch (message_ended)
3233 /* Handle premature termination of SMTP */
3238 Uunlink(spool_name); /* Lose data file when closed */
3239 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3240 message_id[0] = 0; /* Indicate no message accepted */
3241 smtp_reply = handle_lost_connection(US"");
3243 goto TIDYUP; /* Skip to end of function */
3247 /* Handle message that is too big. Don't use host_or_ident() in the log
3248 message; we want to see the ident value even for non-remote messages. */
3251 Uunlink(spool_name); /* Lose the data file when closed */
3252 cancel_cutthrough_connection(TRUE, US"mail too big");
3253 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3255 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3256 "message too big: read=%d max=%d",
3258 sender_fullhost ? " H=" : "",
3259 sender_fullhost ? sender_fullhost : US"",
3260 sender_ident ? " U=" : "",
3261 sender_ident ? sender_ident : US"",
3263 thismessage_size_limit);
3267 smtp_reply = US"552 Message size exceeds maximum permitted";
3268 message_id[0] = 0; /* Indicate no message accepted */
3269 goto TIDYUP; /* Skip to end of function */
3273 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3274 give_local_error(ERRMESS_TOOBIG,
3275 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3276 US"message rejected: ", error_rc, spool_data_file, header_list);
3277 /* Does not return */
3281 /* Handle bad BDAT protocol sequence */
3284 Uunlink(spool_name); /* Lose the data file when closed */
3285 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3286 smtp_reply = US""; /* Response already sent */
3287 message_id[0] = 0; /* Indicate no message accepted */
3288 goto TIDYUP; /* Skip to end of function */
3292 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3293 example, there may be some expansion in an ACL that uses a timer.) */
3295 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3297 /* The message body has now been read into the data file. Call fflush() to
3298 empty the buffers in C, and then call fsync() to get the data written out onto
3299 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3300 having to do this). If there was an I/O error on either input or output,
3301 attempt to send an error message, and unlink the spool file. For non-SMTP input
3302 we can then give up. Note that for SMTP input we must swallow the remainder of
3303 the input in cases of output errors, since the far end doesn't expect to see
3304 anything until the terminating dot line is sent. */
3306 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3307 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3309 uschar *msg_errno = US strerror(errno);
3310 BOOL input_error = (receive_ferror)() != 0;
3311 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3312 input_error? "Input read" : "Spool write",
3314 sender_fullhost ? sender_fullhost : sender_ident);
3316 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3317 Uunlink(spool_name); /* Lose the data file */
3318 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3323 smtp_reply = US"451 Error while reading input data";
3326 smtp_reply = US"451 Error while writing spool file";
3327 receive_swallow_smtp();
3329 message_id[0] = 0; /* Indicate no message accepted */
3330 goto TIDYUP; /* Skip to end of function */
3335 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3336 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3338 /* Does not return */
3343 /* No I/O errors were encountered while writing the data file. */
3345 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3346 gettimeofday(&received_time_complete, NULL);
3349 /* If there were any bad addresses extracted by -t, or there were no recipients
3350 left after -t, send a message to the sender of this message, or write it to
3351 stderr if the error handling option is set that way. Note that there may
3352 legitimately be no recipients for an SMTP message if they have all been removed
3355 We need to rewind the data file in order to read it. In the case of no
3356 recipients or stderr error writing, throw the data file away afterwards, and
3357 exit. (This can't be SMTP, which always ensures there's at least one
3358 syntactically good recipient address.) */
3360 if (extract_recip && (bad_addresses || recipients_count == 0))
3364 if (recipients_count == 0) debug_printf("*** No recipients\n");
3367 debug_printf("*** Bad address(es)\n");
3368 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3369 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3373 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3374 message_id, bad_addresses ? "bad addresses" : "no recipients");
3376 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3378 /* If configured to send errors to the sender, but this fails, force
3379 a failure error code. We use a special one for no recipients so that it
3380 can be detected by the autoreply transport. Otherwise error_rc is set to
3381 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3382 it is EXIT_SUCCESS. */
3384 if (error_handling == ERRORS_SENDER)
3386 if (!moan_to_sender(
3388 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3389 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3390 bad_addresses, header_list, spool_data_file, FALSE
3392 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3397 if (extracted_ignored)
3398 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3400 fprintf(stderr, "exim: no recipients in message\n");
3403 fprintf(stderr, "exim: invalid address%s",
3404 bad_addresses->next ? "es:\n" : ":");
3405 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3406 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3407 bad_addresses->text2);
3411 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3413 Uunlink(spool_name);
3414 (void)fclose(spool_data_file);
3415 exim_exit(error_rc);
3419 /* Data file successfully written. Generate text for the Received: header by
3420 expanding the configured string, and adding a timestamp. By leaving this
3421 operation till now, we ensure that the timestamp is the time that message
3422 reception was completed. However, this is deliberately done before calling the
3423 data ACL and local_scan().
3425 This Received: header may therefore be inspected by the data ACL and by code in
3426 the local_scan() function. When they have run, we update the timestamp to be
3427 the final time of reception.
3429 If there is just one recipient, set up its value in the $received_for variable
3430 for use when we generate the Received: header.
3432 Note: the checking for too many Received: headers is handled by the delivery
3434 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3436 if (!received_header->text) /* Non-cutthrough case */
3438 received_header_gen();
3440 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3442 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3443 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3445 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3446 now, before running the DATA ACL. */
3448 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3451 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3452 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3454 /* If an ACL is specified for checking things at this stage of reception of a
3455 message, run it, unless all the recipients were removed by "discard" in earlier
3456 ACLs. That is the only case in which recipients_count can be zero at this
3457 stage. Set deliver_datafile to point to the data file so that $message_body and
3458 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3461 deliver_datafile = data_fd;
3464 f.enable_dollar_recipients = TRUE;
3466 if (recipients_count == 0)
3467 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3471 /* Handle interactive SMTP messages */
3473 if (smtp_input && !smtp_batched_input)
3476 #ifndef DISABLE_DKIM
3477 if (!f.dkim_disable_verify)
3479 /* Finish verification */
3480 dkim_exim_verify_finish();
3482 /* Check if we must run the DKIM ACL */
3483 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3485 uschar * dkim_verify_signers_expanded =
3486 expand_string(dkim_verify_signers);
3487 gstring * results = NULL;
3491 gstring * seen_items = NULL;
3492 int old_pool = store_pool;
3494 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3496 if (!(ptr = dkim_verify_signers_expanded))
3497 log_write(0, LOG_MAIN|LOG_PANIC,
3498 "expansion of dkim_verify_signers option failed: %s",
3499 expand_string_message);
3501 /* Default to OK when no items are present */
3503 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3505 /* Prevent running ACL for an empty item */
3506 if (!item || !*item) continue;
3508 /* Only run ACL once for each domain or identity,
3509 no matter how often it appears in the expanded list. */
3513 const uschar * seen_items_list = string_from_gstring(seen_items);
3515 BOOL seen_this_item = FALSE;
3517 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3519 if (Ustrcmp(seen_item,item) == 0)
3521 seen_this_item = TRUE;
3528 debug_printf("acl_smtp_dkim: skipping signer %s, "
3529 "already seen\n", item);
3533 seen_items = string_catn(seen_items, US":", 1);
3535 seen_items = string_cat(seen_items, item);
3537 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3541 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3542 "skipping remaining items\n", rc, item);
3543 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3547 dkim_verify_status = string_from_gstring(results);
3548 store_pool = old_pool;
3549 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3552 recipients_count = 0;
3553 blackholed_by = US"DKIM ACL";
3555 blackhole_log_msg = string_sprintf(": %s", log_msg);
3559 Uunlink(spool_name);
3560 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3561 smtp_yield = FALSE; /* No more messages after dropped connection */
3562 smtp_reply = US""; /* Indicate reply already sent */
3563 message_id[0] = 0; /* Indicate no message accepted */
3564 goto TIDYUP; /* Skip to end of function */
3568 dkim_exim_verify_log_all();
3570 #endif /* DISABLE_DKIM */
3572 #ifdef WITH_CONTENT_SCAN
3573 if ( recipients_count > 0
3575 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3578 #endif /* WITH_CONTENT_SCAN */
3580 #ifdef SUPPORT_DMARC
3581 dmarc_store_data(from_header);
3584 #ifndef DISABLE_PRDR
3585 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3588 int all_fail = FAIL;
3590 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3591 /* Loop through recipients, responses must be in same order received */
3592 for (unsigned int c = 0; recipients_count > c; c++)
3594 uschar * addr= recipients_list[c].address;
3595 uschar * msg= US"PRDR R=<%s> %s";
3598 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3599 addr, c+1, recipients_count);
3600 rc = acl_check(ACL_WHERE_PRDR, addr,
3601 acl_smtp_data_prdr, &user_msg, &log_msg);
3603 /* If any recipient rejected content, indicate it in final message */
3605 /* If all recipients rejected, indicate in final message */
3610 case OK: case DISCARD: code = US"250"; break;
3611 case DEFER: code = US"450"; break;
3612 default: code = US"550"; break;
3614 if (user_msg != NULL)
3615 smtp_user_msg(code, user_msg);
3620 case OK: case DISCARD:
3621 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3623 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3625 msg = string_sprintf(CS msg, addr, "refusal"); break;
3627 smtp_user_msg(code, msg);
3629 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3630 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3631 else log_write(0, LOG_MAIN, "%s", CS msg);
3633 if (rc != OK) { receive_remove_recipient(addr); c--; }
3635 /* Set up final message, used if data acl gives OK */
3636 smtp_reply = string_sprintf("%s id=%s message %s",
3637 all_fail == FAIL ? US"550" : US"250",
3640 ? US"rejected for all recipients"
3643 : US"accepted for some recipients");
3644 if (recipients_count == 0)
3646 message_id[0] = 0; /* Indicate no message accepted */
3651 prdr_requested = FALSE;
3652 #endif /* !DISABLE_PRDR */
3654 /* Check the recipients count again, as the MIME ACL might have changed
3657 if (acl_smtp_data != NULL && recipients_count > 0)
3659 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3660 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3663 recipients_count = 0;
3664 blackholed_by = US"DATA ACL";
3666 blackhole_log_msg = string_sprintf(": %s", log_msg);
3667 cancel_cutthrough_connection(TRUE, US"data acl discard");
3671 Uunlink(spool_name);
3672 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3673 #ifdef WITH_CONTENT_SCAN
3676 #ifdef EXPERIMENTAL_DCC
3679 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3680 smtp_yield = FALSE; /* No more messages after dropped connection */
3681 smtp_reply = US""; /* Indicate reply already sent */
3682 message_id[0] = 0; /* Indicate no message accepted */
3683 goto TIDYUP; /* Skip to end of function */
3688 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3689 we cannot take different actions for permanent and temporary rejections. */
3694 #ifdef WITH_CONTENT_SCAN
3695 if ( acl_not_smtp_mime
3696 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3700 #endif /* WITH_CONTENT_SCAN */
3704 uschar *user_msg, *log_msg;
3705 f.authentication_local = TRUE;
3706 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3709 recipients_count = 0;
3710 blackholed_by = US"non-SMTP ACL";
3712 blackhole_log_msg = string_sprintf(": %s", log_msg);
3716 Uunlink(spool_name);
3717 #ifdef WITH_CONTENT_SCAN
3720 #ifdef EXPERIMENTAL_DCC
3723 /* The ACL can specify where rejections are to be logged, possibly
3724 nowhere. The default is main and reject logs. */
3726 if (log_reject_target)
3727 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3728 sender_address, log_msg);
3730 if (!user_msg) user_msg = US"local configuration problem";
3731 if (smtp_batched_input)
3732 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3733 /* Does not return */
3736 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3737 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3738 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3740 /* Does not return */
3743 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3747 /* The applicable ACLs have been run */
3749 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3750 if (f.queue_only_policy) queued_by = US"ACL";
3753 #ifdef WITH_CONTENT_SCAN
3757 #ifdef EXPERIMENTAL_DCC
3762 #ifdef HAVE_LOCAL_SCAN
3763 /* The final check on the message is to run the scan_local() function. The
3764 version supplied with Exim always accepts, but this is a hook for sysadmins to
3765 supply their own checking code. The local_scan() function is run even when all
3766 the recipients have been discarded. */
3768 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3770 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3771 deleted, and the incident gets logged. */
3773 if (sigsetjmp(local_scan_env, 1) == 0)
3775 had_local_scan_crash = 0;
3776 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3777 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3778 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3779 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3781 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3782 local_scan_timeout);
3783 local_scan_data = NULL;
3785 had_local_scan_timeout = 0;
3786 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3787 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3788 rc = local_scan(data_fd, &local_scan_data);
3790 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3792 f.enable_dollar_recipients = FALSE;
3794 store_pool = POOL_MAIN; /* In case changed */
3795 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3798 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3799 os_non_restarting_signal(SIGFPE, SIG_DFL);
3800 os_non_restarting_signal(SIGILL, SIG_DFL);
3801 os_non_restarting_signal(SIGBUS, SIG_DFL);
3805 if (had_local_scan_crash)
3807 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3808 "signal %d - message temporarily rejected (size %d)",
3809 had_local_scan_crash, message_size);
3810 receive_bomb_out(US"local-scan-error", US"local verification problem");
3811 /* Does not return */
3813 if (had_local_scan_timeout)
3815 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3816 "message temporarily rejected (size %d)", message_size);
3817 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3818 /* Does not return */
3822 /* The length check is paranoia against some runaway code, and also because
3823 (for a success return) lines in the spool file are read into big_buffer. */
3825 if (local_scan_data)
3827 int len = Ustrlen(local_scan_data);
3828 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3829 local_scan_data = string_copyn(local_scan_data, len);
3832 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3834 if (!f.deliver_freeze) /* ACL might have already frozen */
3836 f.deliver_freeze = TRUE;
3837 deliver_frozen_at = time(NULL);
3838 frozen_by = US"local_scan()";
3840 rc = LOCAL_SCAN_ACCEPT;
3842 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3844 if (!f.queue_only_policy) /* ACL might have already queued */
3846 f.queue_only_policy = TRUE;
3847 queued_by = US"local_scan()";
3849 rc = LOCAL_SCAN_ACCEPT;
3852 /* Message accepted: remove newlines in local_scan_data because otherwise
3853 the spool file gets corrupted. Ensure that all recipients are qualified. */
3855 if (rc == LOCAL_SCAN_ACCEPT)
3857 if (local_scan_data)
3858 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3859 for (int i = 0; i < recipients_count; i++)
3861 recipient_item *r = recipients_list + i;
3862 r->address = rewrite_address_qualify(r->address, TRUE);
3864 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3866 if (recipients_count == 0 && !blackholed_by)
3867 blackholed_by = US"local_scan";
3870 /* Message rejected: newlines permitted in local_scan_data to generate
3871 multiline SMTP responses. */
3875 uschar *istemp = US"";
3879 errmsg = local_scan_data;
3881 Uunlink(spool_name); /* Cancel this message */
3885 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3886 "rejection given", rc);
3889 case LOCAL_SCAN_REJECT_NOLOGHDR:
3890 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3893 case LOCAL_SCAN_REJECT:
3894 smtp_code = US"550";
3895 if (!errmsg) errmsg = US"Administrative prohibition";
3898 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3899 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3902 case LOCAL_SCAN_TEMPREJECT:
3904 smtp_code = US"451";
3905 if (!errmsg) errmsg = US"Temporary local problem";
3906 istemp = US"temporarily ";
3910 g = string_append(NULL, 2, US"F=",
3911 sender_address[0] == 0 ? US"<>" : sender_address);
3912 g = add_host_info_for_log(g);
3914 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3915 string_from_gstring(g), istemp, string_printing(errmsg));
3918 if (!smtp_batched_input)
3920 smtp_respond(smtp_code, 3, TRUE, errmsg);
3921 message_id[0] = 0; /* Indicate no message accepted */
3922 smtp_reply = US""; /* Indicate reply already sent */
3923 goto TIDYUP; /* Skip to end of function */
3926 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3927 /* Does not return */
3930 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3931 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3932 US"message rejected by local scan code: ", error_rc, spool_data_file,
3934 /* Does not return */
3938 /* Reset signal handlers to ignore signals that previously would have caused
3939 the message to be abandoned. */
3941 signal(SIGTERM, SIG_IGN);
3942 signal(SIGINT, SIG_IGN);
3943 #endif /* HAVE_LOCAL_SCAN */
3946 /* Ensure the first time flag is set in the newly-received message. */
3948 f.deliver_firsttime = TRUE;
3950 #ifdef EXPERIMENTAL_BRIGHTMAIL
3952 { /* rewind data file */
3953 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3954 bmi_verdicts = bmi_process_message(header_list, data_fd);
3958 /* Update the timestamp in our Received: header to account for any time taken by
3959 an ACL or by local_scan(). The new time is the time that all reception
3960 processing is complete. */
3962 timestamp = expand_string(US"${tod_full}");
3963 tslen = Ustrlen(timestamp);
3965 memcpy(received_header->text + received_header->slen - tslen - 1,
3968 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3972 f.deliver_freeze = FALSE;
3973 f.queue_only_policy = FALSE;
3976 /* Keep the data file open until we have written the header file, in order to
3977 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3978 don't write the header file, and we unlink the data file. If writing the header
3979 file fails, we have failed to accept this message. */
3981 if (host_checking || blackholed_by)
3983 Uunlink(spool_name);
3984 msg_size = 0; /* Compute size for log line */
3985 for (header_line * h = header_list; h; h = h->next)
3986 if (h->type != '*') msg_size += h->slen;
3989 /* Write the -H file */
3992 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3994 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3995 Uunlink(spool_name); /* Lose the data file */
3999 smtp_reply = US"451 Error in writing spool file";
4000 message_id[0] = 0; /* Indicate no message accepted */
4005 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
4006 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4008 /* Does not return */
4013 /* The message has now been successfully received. */
4015 receive_messagecount++;
4017 /* Add data size to written header size. We do not count the initial file name
4018 that is in the file, but we do add one extra for the notional blank line that
4019 precedes the data. This total differs from message_size in that it include the
4020 added Received: header and any other headers that got created locally. */
4022 if (fflush(spool_data_file))
4024 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
4025 log_write(0, LOG_MAIN, "%s\n", errmsg);
4026 Uunlink(spool_name); /* Lose the data file */
4030 smtp_reply = US"451 Error in writing spool file";
4031 message_id[0] = 0; /* Indicate no message accepted */
4036 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
4037 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4039 /* Does not return */
4042 fstat(data_fd, &statbuf);
4044 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
4046 /* Generate a "message received" log entry. We do this by building up a dynamic
4047 string as required. We log the arrival of a new message while the
4048 file is still locked, just in case the machine is *really* fast, and delivers
4049 it first! Include any message id that is in the message - since the syntax of a
4050 message id is actually an addr-spec, we can use the parse routine to canonicalize
4053 rcvd_log_reset_point = store_mark();
4054 g = string_get(256);
4056 g = string_append(g, 2,
4057 fake_response == FAIL ? US"(= " : US"<= ",
4058 sender_address[0] == 0 ? US"<>" : sender_address);
4059 if (message_reference)
4060 g = string_append(g, 2, US" R=", message_reference);
4062 g = add_host_info_for_log(g);
4065 if (LOGGING(tls_cipher) && tls_in.cipher)
4067 g = string_append(g, 2, US" X=", tls_in.cipher);
4068 # ifndef DISABLE_TLS_RESUME
4069 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4070 g = string_catn(g, US"*", 1);
4073 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4074 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4075 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4076 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4077 if (LOGGING(tls_sni) && tls_in.sni)
4078 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4081 if (sender_host_authenticated)
4083 g = string_append(g, 2, US" A=", sender_host_authenticated);
4084 if (authenticated_id)
4086 g = string_append(g, 2, US":", authenticated_id);
4087 if (LOGGING(smtp_mailauth) && authenticated_sender)
4088 g = string_append(g, 2, US":", authenticated_sender);
4092 #ifndef DISABLE_PRDR
4094 g = string_catn(g, US" PRDR", 5);
4097 #ifdef SUPPORT_PROXY
4098 if (proxy_session && LOGGING(proxy))
4099 g = string_append(g, 2, US" PRX=", proxy_local_address);
4102 if (chunking_state > CHUNKING_OFFERED)
4103 g = string_catn(g, US" K", 2);
4105 g = string_fmt_append(g, " S=%d", msg_size);
4107 /* log 8BITMIME mode announced in MAIL_FROM
4111 if (LOGGING(8bitmime))
4112 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4114 #ifndef DISABLE_DKIM
4115 if (LOGGING(dkim) && dkim_verify_overall)
4116 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4117 # ifdef EXPERIMENTAL_ARC
4118 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4119 g = string_catn(g, US" ARC", 4);
4123 if (LOGGING(receive_time))
4125 struct timeval diff = received_time_complete;
4126 timediff(&diff, &received_time);
4127 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4131 g = string_append(g, 2, US" Q=", queue_name);
4133 /* If an addr-spec in a message-id contains a quoted string, it can contain
4134 any characters except " \ and CR and so in particular it can contain NL!
4135 Therefore, make sure we use a printing-characters only version for the log.
4136 Also, allow for domain literals in the message id. */
4138 if ( LOGGING(msg_id) && msgid_header
4139 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4143 BOOL save_allow_domain_literals = allow_domain_literals;
4144 allow_domain_literals = TRUE;
4145 int start, end, domain;
4147 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4148 &errmsg, &start, &end, &domain, FALSE);
4149 allow_domain_literals = save_allow_domain_literals;
4151 g = string_append(g, 2,
4152 msgid_header_newly_created ? US" id*=" : US" id=",
4153 string_printing(old_id));
4156 /* If subject logging is turned on, create suitable printing-character
4157 text. By expanding $h_subject: we make use of the MIME decoding. */
4159 if (LOGGING(subject) && subject_header)
4161 uschar *p = big_buffer;
4162 uschar *ss = expand_string(US"$h_subject:");
4164 /* Backslash-quote any double quotes or backslashes so as to make a
4165 a C-like string, and turn any non-printers into escape sequences. */
4168 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4170 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4175 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4178 /* Terminate the string: string_cat() and string_append() leave room, but do
4179 not put the zero in. */
4181 (void) string_from_gstring(g);
4183 /* Create a message log file if message logs are being used and this message is
4184 not blackholed. Write the reception stuff to it. We used to leave message log
4185 creation until the first delivery, but this has proved confusing for some
4188 if (message_logs && !blackholed_by)
4191 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4193 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4197 (void)directory_make(spool_directory,
4198 spool_sname(US"msglog", message_subdir),
4199 MSGLOG_DIRECTORY_MODE, TRUE);
4200 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4204 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4205 m_name, strerror(errno));
4208 FILE *message_log = fdopen(fd, "a");
4211 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4212 m_name, strerror(errno));
4217 uschar * now = tod_stamp(tod_log);
4218 /* Drop the initial "<= " */
4219 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4220 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4222 if (f.queue_only_policy) fprintf(message_log,
4223 "%s no immediate delivery: queued%s%s by %s\n", now,
4224 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4226 (void)fclose(message_log);
4231 /* Everything has now been done for a successful message except logging its
4232 arrival, and outputting an SMTP response. While writing to the log, set a flag
4233 to cause a call to receive_bomb_out() if the log cannot be opened. */
4235 f.receive_call_bombout = TRUE;
4237 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4238 connection has gone away. This can only be done if there is no unconsumed input
4239 waiting in the local input buffer. We can test for this by calling
4240 receive_hasc(). RFC 2920 (pipelining) explicitly allows for additional
4241 input to be sent following the final dot, so the presence of following input is
4244 If the connection is still present, but there is no unread input for the
4245 socket, the result of a select() call will be zero. If, however, the connection
4246 has gone away, or if there is pending input, the result of select() will be
4247 non-zero. The two cases can be distinguished by trying to read the next input
4248 character. If we succeed, we can unread it so that it remains in the local
4249 buffer for handling later. If not, the connection has been lost.
4251 Of course, since TCP/IP is asynchronous, there is always a chance that the
4252 connection will vanish between the time of this test and the sending of the
4253 response, but the chance of this happening should be small. */
4255 if ( smtp_input && sender_host_address && !f.sender_host_notsocket
4258 if (poll_one_fd(fileno(smtp_in), POLLIN, 0) != 0)
4260 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4261 if (c != EOF) (receive_ungetc)(c);
4264 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4265 smtp_reply = US""; /* No attempt to send a response */
4266 smtp_yield = FALSE; /* Nothing more on this connection */
4268 /* Re-use the log line workspace */
4271 g = string_cat(g, US"SMTP connection lost after final dot");
4272 g = add_host_info_for_log(g);
4273 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4275 /* Delete the files for this aborted message. */
4277 Uunlink(spool_name);
4278 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4279 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4286 /* The connection has not gone away; we really are going to take responsibility
4287 for this message. */
4289 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4292 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4293 the sender's dot (below).
4294 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4295 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4296 in which case pass temp-reject back to initiator and dump the files.
4298 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4300 XXX We do not handle queue-only, freezing, or blackholes.
4302 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4304 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4305 /* Logging was done in finaldot() */
4308 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4309 cutthrough_done = ACCEPTED;
4310 break; /* message_id needed for SMTP accept below */
4312 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4313 ... for which, pass back the exact error */
4314 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4315 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4316 break; /* message_id needed for SMTP accept below */
4318 default: /* Unknown response, or error. Treat as temp-reject. */
4319 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4320 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4321 break; /* message_id needed for SMTP accept below */
4323 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4324 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4325 cutthrough_done = PERM_REJ;
4330 #ifndef DISABLE_PRDR
4331 if(!smtp_reply || prdr_requested)
4336 log_write(0, LOG_MAIN |
4337 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4338 (LOGGING(received_sender) ? LOG_SENDER : 0),
4341 /* Log any control actions taken by an ACL or local_scan(). */
4343 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4344 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4345 "no immediate delivery: queued%s%s by %s",
4346 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4349 f.receive_call_bombout = FALSE;
4351 /* The store for the main log message can be reused */
4352 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4354 /* If the message is frozen, and freeze_tell is set, do the telling. */
4356 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4357 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4358 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4359 message_id, frozen_by, sender_address);
4362 /* Either a message has been successfully received and written to the two spool
4363 files, or an error in writing the spool has occurred for an SMTP message, or
4364 an SMTP message has been rejected for policy reasons, or a message was passed on
4365 by cutthrough delivery. (For a non-SMTP message we will have already given up
4366 because there's no point in carrying on!) For non-cutthrough we must now close
4367 (and thereby unlock) the data file. In the successful case, this leaves the
4368 message on the spool, ready for delivery. In the error case, the spool file will
4369 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4372 For cutthrough we hold the data file locked until we have deleted it, otherwise
4373 a queue-runner could grab it in the window.
4375 A fflush() was done earlier in the expectation that any write errors on the
4376 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4377 possible for fclose() to fail - but what to do? What has happened to the lock
4378 if this happens? We can at least log it; if it is observed on some platform
4379 then we can think about properly declaring the message not-received. */
4383 process_info[process_info_len] = 0; /* Remove message id */
4384 if (spool_data_file && cutthrough_done == NOT_TRIED)
4386 if (fclose(spool_data_file)) /* Frees the lock */
4387 log_write(0, LOG_MAIN|LOG_PANIC,
4388 "spoolfile error on close: %s", strerror(errno));
4389 spool_data_file = NULL;
4392 /* Now reset signal handlers to their defaults */
4394 signal(SIGTERM, SIG_DFL);
4395 signal(SIGINT, SIG_DFL);
4397 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4398 value, which defaults TRUE - meaning there may be more incoming messages from
4399 this connection. For non-SMTP callers (where there is only ever one message),
4400 the default is FALSE. */
4406 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4407 is set to the response that should be sent. When it is NULL, we generate
4408 default responses. After an ACL error or local_scan() error, the response has
4409 already been sent, and smtp_reply is an empty string to indicate this. */
4411 if (!smtp_batched_input)
4415 if (fake_response != OK)
4416 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4417 3, TRUE, fake_response_text);
4419 /* An OK response is required; use "message" text if present. */
4423 uschar *code = US"250";
4425 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4426 smtp_respond(code, len, TRUE, user_msg);
4429 /* Default OK response */
4431 else if (chunking_state > CHUNKING_OFFERED)
4433 /* If there is more input waiting, no need to flush (probably the client
4434 pipelined QUIT after data). We check only the in-process buffer, not
4437 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4439 chunking_datasize, message_size+message_linecount, message_id);
4440 chunking_state = CHUNKING_OFFERED;
4443 smtp_printf("250 OK id=%s\r\n", receive_hasc(), message_id);
4447 "\n**** SMTP testing: that is not a real message id!\n\n");
4450 /* smtp_reply is set non-empty */
4452 else if (smtp_reply[0] != 0)
4453 if (fake_response != OK && smtp_reply[0] == '2')
4454 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4455 fake_response_text);
4457 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4459 switch (cutthrough_done)
4462 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4464 /* Delete spool files */
4465 Uunlink(spool_name);
4466 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4467 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4471 if (cutthrough.defer_pass)
4473 Uunlink(spool_name);
4474 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4475 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4480 if (cutthrough_done != NOT_TRIED)
4482 if (spool_data_file)
4484 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4485 spool_data_file = NULL;
4487 message_id[0] = 0; /* Prevent a delivery from starting */
4488 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4489 cutthrough.defer_pass = FALSE;
4493 /* For batched SMTP, generate an error message on failure, and do
4494 nothing on success. The function moan_smtp_batch() does not return -
4495 it exits from the program with a non-zero return code. */
4497 else if (smtp_reply)
4498 moan_smtp_batch(NULL, "%s", smtp_reply);
4502 /* If blackholing, we can immediately log this message's sad fate. The data
4503 file has already been unlinked, and the header file was never written to disk.
4504 We must now indicate that nothing was received, to prevent a delivery from
4509 const uschar *detail =
4510 #ifdef HAVE_LOCAL_SCAN
4511 local_scan_data ? string_printing(local_scan_data) :
4513 string_sprintf("(%s discarded recipients)", blackholed_by);
4514 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4515 log_write(0, LOG_MAIN, "Completed");
4519 /* Reset headers so that logging of rejects for a subsequent message doesn't
4520 include them. It is also important to set header_last = NULL before exiting
4521 from this function, as this prevents certain rewrites that might happen during
4522 subsequent verifying (of another incoming message) from trying to add headers
4523 when they shouldn't. */
4525 header_list = header_last = NULL;
4527 return yield; /* TRUE if more messages (SMTP only) */
4530 /* End of receive.c */