1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2023 */
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(const uschar * newsender)
142 const uschar * qnewsender;
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)
295 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
297 int_eximarith_t space = receive_statvfs(TRUE, &inodes);
300 debug_printf("spool directory space = " PR_EXIM_ARITH "K inodes = %d "
301 "check_space = " PR_EXIM_ARITH "K inodes = %d msg_size = %d\n",
302 space, inodes, check_spool_space, check_spool_inodes, msg_size);
304 if ( space >= 0 && space + msg_size / 1024 < check_spool_space
305 || inodes >= 0 && inodes < check_spool_inodes)
307 log_write(0, LOG_MAIN, "spool directory space check failed: space="
308 PR_EXIM_ARITH " inodes=%d", space, inodes);
313 if (check_log_space > 0 || check_log_inodes > 0)
315 int_eximarith_t space = receive_statvfs(FALSE, &inodes);
318 debug_printf("log directory space = " PR_EXIM_ARITH "K inodes = %d "
319 "check_space = " PR_EXIM_ARITH "K inodes = %d\n",
320 space, inodes, check_log_space, check_log_inodes);
322 if ( space >= 0 && space < check_log_space
323 || inodes >= 0 && inodes < check_log_inodes)
325 log_write(0, LOG_MAIN, "log directory space check failed: space=" PR_EXIM_ARITH
326 " inodes=%d", space, inodes);
336 /*************************************************
337 * Bomb out while reading a message *
338 *************************************************/
340 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
341 received, or if there is a timeout. A rarer case might be if the log files are
342 screwed up and Exim can't open them to record a message's arrival. Handling
343 that case is done by setting a flag to cause the log functions to call this
344 function if there is an ultimate disaster. That is why it is globally
348 reason text reason to pass to the not-quit ACL
349 msg default SMTP response to give if in an SMTP session
354 receive_bomb_out(uschar *reason, uschar *msg)
356 static BOOL already_bombing_out;
357 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
358 timeouts, if someone has something slow in their quit ACL. Since the only
359 things we should be doing are to close down cleanly ASAP, on the second
360 pass we also close down stuff that might be opened again, before bypassing
361 the ACL call and exiting. */
363 /* If spool_name is set, it contains the name of the data file that is being
364 written. Unlink it before closing so that it cannot be picked up by a delivery
365 process. Ensure that any header file is also removed. */
367 if (spool_name[0] != '\0')
370 spool_name[Ustrlen(spool_name) - 1] = 'H';
372 spool_name[0] = '\0';
375 /* Now close the file if it is open, either as a fd or a stream. */
379 (void)fclose(spool_data_file);
380 spool_data_file = NULL;
382 else if (data_fd >= 0)
384 (void)close(data_fd);
388 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
389 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
392 if (!already_bombing_out)
394 already_bombing_out = TRUE;
397 if (smtp_batched_input)
398 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
399 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
400 smtp_active_hostname, msg);
404 /* Exit from the program (non-BSMTP cases) */
406 exim_exit(EXIT_FAILURE);
410 /*************************************************
411 * Data read timeout *
412 *************************************************/
414 /* Handler function for timeouts that occur while reading the data that
417 Argument: the signal number
422 data_timeout_handler(int sig)
424 had_data_timeout = sig;
429 #ifdef HAVE_LOCAL_SCAN
430 /*************************************************
431 * local_scan() timeout *
432 *************************************************/
434 /* Handler function for timeouts that occur while running a local_scan()
435 function. Posix recommends against calling longjmp() from a signal-handler,
436 but the GCC manual says you can so we will, and trust that it's better than
437 calling probably non-signal-safe funxtions during logging from within the
438 handler, even with other compilers.
440 See also https://cwe.mitre.org/data/definitions/745.html which also lists
443 This is all because we have no control over what might be written for a
444 local-scan function, so cannot sprinkle had-signal checks after each
445 call-site. At least with the default "do-nothing" function we won't
448 Argument: the signal number
453 local_scan_timeout_handler(int sig)
455 had_local_scan_timeout = sig;
456 siglongjmp(local_scan_env, 1);
461 /*************************************************
462 * local_scan() crashed *
463 *************************************************/
465 /* Handler function for signals that occur while running a local_scan()
468 Argument: the signal number
473 local_scan_crash_handler(int sig)
475 had_local_scan_crash = sig;
476 siglongjmp(local_scan_env, 1);
479 #endif /*HAVE_LOCAL_SCAN*/
482 /*************************************************
483 * SIGTERM or SIGINT received *
484 *************************************************/
486 /* Handler for SIGTERM or SIGINT signals that occur while reading the
487 data that comprises a message.
489 Argument: the signal number
494 data_sigterm_sigint_handler(int sig)
496 had_data_sigint = sig;
501 /*************************************************
502 * Add new recipient to list *
503 *************************************************/
505 /* This function builds a list of recipient addresses in argc/argv
509 recipient the next address to add to recipients_list
510 pno parent number for fixed aliases; -1 otherwise
516 receive_add_recipient(const uschar * recipient, int pno)
518 if (recipients_count >= recipients_list_max)
520 recipient_item *oldlist = recipients_list;
521 int oldmax = recipients_list_max;
523 const int safe_recipients_limit = INT_MAX / 2 / sizeof(recipient_item);
524 if (recipients_list_max < 0 || recipients_list_max >= safe_recipients_limit)
526 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Too many recipients: %d", recipients_list_max);
529 recipients_list_max = recipients_list_max ? 2*recipients_list_max : 50;
530 recipients_list = store_get(recipients_list_max * sizeof(recipient_item), GET_UNTAINTED);
532 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
535 recipients_list[recipients_count].address = recipient;
536 recipients_list[recipients_count].pno = pno;
537 #ifdef EXPERIMENTAL_BRIGHTMAIL
538 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
539 /* reset optin string pointer for next recipient */
540 bmi_current_optin = NULL;
542 recipients_list[recipients_count].orcpt = NULL;
543 recipients_list[recipients_count].dsn_flags = 0;
544 recipients_list[recipients_count++].errors_to = NULL;
550 /*************************************************
551 * Send user response message *
552 *************************************************/
554 /* This function is passed a default response code and a user message. It calls
555 smtp_message_code() to check and possibly modify the response code, and then
556 calls smtp_respond() to transmit the response. I put this into a function
557 just to avoid a lot of repetition.
560 code the response code
561 user_msg the user message
568 smtp_user_msg(uschar *code, uschar *user_msg)
571 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
572 smtp_respond(code, len, SR_FINAL, user_msg);
580 /*************************************************
581 * Remove a recipient from the list *
582 *************************************************/
584 /* This function is provided for local_scan() to use.
587 recipient address to remove
589 Returns: TRUE if it did remove something; FALSE otherwise
593 receive_remove_recipient(const uschar * recipient)
595 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
597 for (int count = 0; count < recipients_count; count++)
598 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
600 if ((--recipients_count - count) > 0)
601 memmove(recipients_list + count, recipients_list + count + 1,
602 (recipients_count - count)*sizeof(recipient_item));
612 /* Pause for a while waiting for input. If none received in that time,
613 close the logfile, if we had one open; then if we wait for a long-running
614 datasource (months, in one use-case) log rotation will not leave us holding
620 if (!receive_timeout && !receive_hasc())
623 timesince(&t, &received_time);
624 if (t.tv_sec > 30*60)
627 if (poll_one_fd(0, POLLIN, (30*60 - t.tv_sec) * 1000) == 0)
632 /*************************************************
633 * Read data portion of a non-SMTP message *
634 *************************************************/
636 /* This function is called to read the remainder of a message (following the
637 header) when the input is not from SMTP - we are receiving a local message on
638 a standard input stream. The message is always terminated by EOF, and is also
639 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
640 two cases for maximum efficiency.
642 Ensure that the body ends with a newline. This will naturally be the case when
643 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
644 as "sequences of lines" - this of course strictly applies only to SMTP, but
645 deliveries into BSD-type mailbox files also require it. Exim used to have a
646 flag for doing this at delivery time, but as it was always set for all
647 transports, I decided to simplify things by putting the check here instead.
649 There is at least one MUA (dtmail) that sends CRLF via this interface, and
650 other programs are known to do this as well. Exim used to have a option for
651 dealing with this: in July 2003, after much discussion, the code has been
652 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
654 However, for the case when a dot on a line by itself terminates a message, the
655 only recognized terminating sequences before and after the dot are LF and CRLF.
656 Otherwise, having read EOL . CR, you don't know whether to read another
659 Internally, in messages stored in Exim's spool files, LF is used as the line
660 terminator. Under the new regime, bare CRs will no longer appear in these
664 fout a FILE to which to write the message
666 Returns: One of the END_xxx values indicating why it stopped reading
670 read_message_data(FILE *fout)
674 register int linelength = 0;
676 /* Handle the case when only EOF terminates the message */
683 log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF;
686 if (ch == 0) body_zerocount++;
687 if (last_ch == '\r' && ch != '\n')
689 if (linelength > max_received_linelength)
690 max_received_linelength = linelength;
692 if (fputc('\n', fout) == EOF) return END_WERROR;
696 if (ch == '\r') continue;
698 if (fputc(ch, fout) == EOF) return END_WERROR;
701 if (linelength > max_received_linelength)
702 max_received_linelength = linelength;
707 if (++message_size > thismessage_size_limit) return END_SIZE;
712 if (linelength > max_received_linelength)
713 max_received_linelength = linelength;
714 if (fputc('\n', fout) == EOF) return END_WERROR;
722 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
726 while (log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
728 if (ch == 0) body_zerocount++;
731 case 0: /* Normal state (previous char written) */
735 if (linelength > max_received_linelength)
736 max_received_linelength = linelength;
741 { ch_state = 2; continue; }
744 case 1: /* After written "\n" */
745 if (ch == '.') { ch_state = 3; continue; }
746 if (ch == '\r') { ch_state = 2; continue; }
747 if (ch == '\n') { body_linecount++; linelength = -1; }
752 body_linecount++; /* After unwritten "\r" */
753 if (linelength > max_received_linelength)
754 max_received_linelength = linelength;
762 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
763 if (ch == '\r') continue;
769 case 3: /* After "\n." (\n written, dot not) */
770 if (ch == '\n') return END_DOT;
771 if (ch == '\r') { ch_state = 4; continue; }
774 if (fputc('.', fout) == EOF) return END_WERROR;
778 case 4: /* After "\n.\r" (\n written, rest not) */
779 if (ch == '\n') return END_DOT;
782 if (fputs(".\n", fout) == EOF) return END_WERROR;
783 if (ch == '\r') { ch_state = 2; continue; }
789 if (fputc(ch, fout) == EOF) return END_WERROR;
790 if (++message_size > thismessage_size_limit) return END_SIZE;
793 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
794 the message ends with a newline, and we must also write any characters that
795 were saved up while testing for an ending dot. */
799 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
800 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
801 message_size += Ustrlen(ends[ch_state]);
811 /*************************************************
812 * Read data portion of an SMTP message *
813 *************************************************/
815 /* This function is called to read the remainder of an SMTP message (after the
816 headers), or to skip over it when an error has occurred. In this case, the
817 output file is passed as NULL.
819 If any line begins with a dot, that character is skipped. The input should only
820 be successfully terminated by CR LF . CR LF unless it is local (non-network)
821 SMTP, in which case the CRs are optional, but...
823 FUDGE: It seems that sites on the net send out messages with just LF
824 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
825 we make the CRs optional in all cases.
827 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
828 well, so that there are no CRs in spooled messages. However, the message
829 terminating dot is not recognized between two bare CRs.
831 Dec 2023: getting a site to send a body including an "LF . LF" sequence
832 followed by SMTP commands is a possible "smtp smuggling" attack. If
833 the first (header) line for the message has a proper CRLF then enforce
834 that for the body: convert bare LF to a space.
837 fout a FILE to which to write the message; NULL if skipping
838 strict_crlf require full CRLF sequence as a line ending
840 Returns: One of the END_xxx values indicating why it stopped reading
844 read_message_data_smtp(FILE * fout, BOOL strict_crlf)
846 enum { s_linestart, s_normal, s_had_cr, s_had_nl_dot, s_had_dot_cr } ch_state =
848 int linelength = 0, ch;
850 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
852 if (ch == 0) body_zerocount++;
855 case s_linestart: /* After LF or CRLF */
858 ch_state = s_had_nl_dot;
859 continue; /* Don't ever write . after LF */
863 /* Else fall through to handle as normal uschar. */
865 case s_normal: /* Normal state */
869 continue; /* Don't write the CR */
871 if (ch == '\n') /* Bare LF at end of line */
873 ch = ' '; /* replace LF with space */
875 { /* treat as line ending */
876 ch_state = s_linestart;
878 if (linelength > max_received_linelength)
879 max_received_linelength = linelength;
884 case s_had_cr: /* After (unwritten) CR */
885 body_linecount++; /* Any char ends line */
886 if (linelength > max_received_linelength)
887 max_received_linelength = linelength;
889 if (ch == '\n') /* proper CRLF */
890 ch_state = s_linestart;
893 message_size++; /* convert the dropped CR to a stored NL */
894 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
895 cutthrough_data_put_nl();
896 if (ch == '\r') /* CR; do not write */
898 ch_state = s_normal; /* not LF or CR; process as standard */
902 case s_had_nl_dot: /* After [CR] LF . */
903 if (ch == '\n') /* [CR] LF . LF */
905 ch = ' '; /* replace LF with space */
908 else if (ch == '\r') /* [CR] LF . CR */
910 ch_state = s_had_dot_cr;
911 continue; /* Don't write the CR */
913 /* The dot was removed on reaching s_had_nl_dot. For a doubled dot, here,
914 reinstate it to cutthrough. The current ch, dot or not, is passed both to
915 cutthrough and to file below. */
919 cutthrough_data_puts(&c, 1);
924 case s_had_dot_cr: /* After [CR] LF . CR */
926 return END_DOT; /* Preferred termination */
928 message_size++; /* convert the dropped CR to a stored NL */
930 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
931 cutthrough_data_put_nl();
935 continue; /* CR; do not write */
941 /* Add the character to the spool file, unless skipping; then loop for the
948 if (fputc(ch, fout) == EOF) return END_WERROR;
949 if (message_size > thismessage_size_limit) return END_SIZE;
952 cutthrough_data_put_nl();
956 cutthrough_data_puts(&c, 1);
960 /* Fall through here if EOF encountered. This indicates some kind of error,
961 since a correct message is terminated by [CR] LF . [CR] LF. */
969 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
970 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
971 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
972 body_linecount accounting for proper re-expansion for the wire, so use
973 a cut-down version of the state-machine above; we don't need to do leading-dot
974 detection and unstuffing.
977 fout a FILE to which to write the message; NULL if skipping;
978 must be open for both writing and reading.
980 Returns: One of the END_xxx values indicating why it stopped reading
984 read_message_bdat_smtp(FILE * fout)
986 int linelength = 0, ch;
987 enum CH_STATE ch_state = LF_SEEN;
992 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
994 case EOF: return END_EOF;
995 case ERR: return END_PROTOCOL;
997 /* Nothing to get from the sender anymore. We check the last
998 character written to the spool.
1000 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
1001 If we would be strict, we would refuse such broken messages.
1002 But we are liberal, so we fix it. It would be easy just to append
1003 the "\n" to the spool.
1005 But there are some more things (line counting, message size calculation and such),
1006 that would need to be duplicated here. So we simply do some ungetc
1011 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
1012 if (fgetc(fout) == '\n') return END_DOT;
1015 if (linelength == -1) /* \r already seen (see below) */
1017 DEBUG(D_receive) debug_printf("Add missing LF\n");
1021 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
1022 bdat_ungetc('\r'); /* not even \r was seen */
1026 case '\0': body_zerocount++; break;
1030 case LF_SEEN: /* After LF or CRLF */
1031 ch_state = MID_LINE;
1032 /* fall through to handle as normal uschar. */
1034 case MID_LINE: /* Mid-line state */
1039 if (linelength > max_received_linelength)
1040 max_received_linelength = linelength;
1043 else if (ch == '\r')
1046 if (fix_nl) bdat_ungetc('\n');
1047 continue; /* don't write CR */
1051 case CR_SEEN: /* After (unwritten) CR */
1053 if (linelength > max_received_linelength)
1054 max_received_linelength = linelength;
1061 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
1062 cutthrough_data_put_nl();
1063 if (ch == '\r') continue; /* don't write CR */
1064 ch_state = MID_LINE;
1069 /* Add the character to the spool file, unless skipping */
1075 if (fputc(ch, fout) == EOF) return END_WERROR;
1076 if (message_size > thismessage_size_limit) return END_SIZE;
1079 cutthrough_data_put_nl();
1083 cutthrough_data_puts(&c, 1);
1090 read_message_bdat_smtp_wire(FILE * fout)
1094 /* Remember that this message uses wireformat. */
1096 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1097 fout ? "writing spoolfile in wire format" : "flushing input");
1098 f.spool_file_wireformat = TRUE;
1102 if (chunking_data_left > 0)
1104 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1105 uschar * buf = bdat_getbuf(&len);
1107 if (!buf) return END_EOF;
1108 message_size += len;
1109 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1111 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1113 case EOF: return END_EOF;
1114 case EOD: return END_DOT;
1115 case ERR: return END_PROTOCOL;
1121 max_received_linelength
1125 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1128 if (message_size > thismessage_size_limit) return END_SIZE;
1136 /*************************************************
1137 * Swallow SMTP message *
1138 *************************************************/
1140 /* This function is called when there has been some kind of error while reading
1141 an SMTP message, and the remaining data may need to be swallowed. It is global
1142 because it is called from smtp_closedown() to shut down an incoming call
1145 Argument: a FILE from which to read the message
1150 receive_swallow_smtp(void)
1152 if (message_ended >= END_NOTENDED)
1153 message_ended = chunking_state <= CHUNKING_OFFERED
1154 ? read_message_data_smtp(NULL, FALSE)
1155 : read_message_bdat_smtp_wire(NULL);
1160 /*************************************************
1161 * Handle lost SMTP connection *
1162 *************************************************/
1164 /* This function logs connection loss incidents and generates an appropriate
1167 Argument: additional data for the message
1168 Returns: the SMTP response
1172 handle_lost_connection(uschar * s)
1174 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1175 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1176 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1177 return US"421 Lost incoming connection";
1183 /*************************************************
1184 * Handle a non-smtp reception error *
1185 *************************************************/
1187 /* This function is called for various errors during the reception of non-SMTP
1188 messages. It either sends a message to the sender of the problem message, or it
1189 writes to the standard error stream.
1192 errcode code for moan_to_sender(), identifying the error
1193 text1 first message text, passed to moan_to_sender()
1194 text2 second message text, used only for stderrr
1195 error_rc code to pass to exim_exit if no problem
1196 f FILE containing body of message (may be stdin)
1197 hptr pointer to instore headers or NULL
1199 Returns: calls exim_exit(), which does not return
1203 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1204 FILE *f, header_line *hptr)
1206 DEBUG(D_all) debug_printf("%s%s\n", text2, text1);
1208 if (error_handling == ERRORS_SENDER)
1212 eblock.text1 = text1;
1213 eblock.text2 = US"";
1214 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1215 error_rc = EXIT_FAILURE;
1218 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1220 exim_exit(error_rc);
1225 /*************************************************
1226 * Add header lines set up by ACL *
1227 *************************************************/
1229 /* This function is called to add the header lines that were set up by
1230 statements in an ACL to the list of headers in memory. It is done in two stages
1231 like this, because when the ACL for RCPT is running, the other headers have not
1232 yet been received. This function is called twice; once just before running the
1233 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1234 are visible to the DATA ACL.
1236 Originally these header lines were added at the end. Now there is support for
1237 three different places: top, bottom, and after the Received: header(s). There
1238 will always be at least one Received: header, even if it is marked deleted, and
1239 even if something else has been put in front of it.
1242 acl_name text to identify which ACL
1248 add_acl_headers(int where, uschar * acl_name)
1250 header_line * last_received = NULL;
1254 case ACL_WHERE_DKIM:
1255 case ACL_WHERE_MIME:
1256 case ACL_WHERE_DATA:
1257 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1258 && (acl_removed_headers || acl_added_headers))
1260 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1261 " will not take effect on cutthrough deliveries");
1266 if (acl_removed_headers)
1268 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1270 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1272 const uschar * list = acl_removed_headers, * s;
1273 int sep = ':'; /* This is specified as a colon-separated list */
1275 /* If a list element has a leading '^' then it is an RE for
1276 the whole header, else just a header name. */
1277 while ((s = string_nextinlist(&list, &sep, NULL, 0)))
1280 regex_must_compile(s, MCS_CACHEABLE, FALSE),
1281 h->text, h->slen, NULL)
1283 || header_testname(h, s, Ustrlen(s), FALSE)
1286 h->type = htype_old;
1287 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1290 acl_removed_headers = NULL;
1291 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1294 if (!acl_added_headers) return;
1295 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1297 for (header_line * h = acl_added_headers, * next; h; h = next)
1304 h->next = header_list;
1306 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1312 last_received = header_list;
1313 while (!header_testname(last_received, US"Received", 8, FALSE))
1314 last_received = last_received->next;
1315 while (last_received->next &&
1316 header_testname(last_received->next, US"Received", 8, FALSE))
1317 last_received = last_received->next;
1319 h->next = last_received->next;
1320 last_received->next = h;
1321 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1325 /* add header before any header which is NOT Received: or Resent- */
1326 last_received = header_list;
1327 while ( last_received->next &&
1328 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1329 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1330 last_received = last_received->next;
1331 /* last_received now points to the last Received: or Resent-* header
1332 in an uninterrupted chain of those header types (seen from the beginning
1333 of all headers. Our current header must follow it. */
1334 h->next = last_received->next;
1335 last_received->next = h;
1336 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1341 header_last->next = h;
1342 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1346 if (!h->next) header_last = h;
1348 /* Check for one of the known header types (From:, To:, etc.) though in
1349 practice most added headers are going to be "other". Lower case
1350 identification letters are never stored with the header; they are used
1351 for existence tests when messages are received. So discard any lower case
1354 h->type = header_checkname(h, FALSE);
1355 if (h->type >= 'a') h->type = htype_other;
1357 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1360 acl_added_headers = NULL;
1361 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1366 /*************************************************
1367 * Add host information for log line *
1368 *************************************************/
1370 /* Called for acceptance and rejecting log lines. This adds information about
1371 the calling host to a string that is being built dynamically.
1374 s the dynamic string
1376 Returns: the extended string
1380 add_host_info_for_log(gstring * g)
1382 if (sender_fullhost)
1384 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1385 g = string_catn(g, US" DS", 3);
1386 g = string_append(g, 2, US" H=", sender_fullhost);
1387 if (LOGGING(incoming_interface) && interface_address)
1388 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1390 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1392 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1393 f.tcp_in_fastopen_logged = TRUE;
1396 g = string_append(g, 2, US" U=", sender_ident);
1397 if (LOGGING(connection_id))
1398 g = string_fmt_append(g, " Ci=%lu", connection_id);
1399 if (received_protocol)
1400 g = string_append(g, 2, US" P=", received_protocol);
1401 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1403 g = string_catn(g, US" L", 2);
1404 #ifndef DISABLE_PIPE_CONNECT
1405 if (f.smtp_in_early_pipe_used)
1406 g = string_catn(g, US"*", 1);
1407 else if (f.smtp_in_early_pipe_advertised)
1408 g = string_catn(g, US".", 1);
1410 if (!f.smtp_in_pipelining_used)
1411 g = string_catn(g, US"-", 1);
1418 #ifdef WITH_CONTENT_SCAN
1420 /*************************************************
1421 * Run the MIME ACL on a message *
1422 *************************************************/
1424 /* This code is in a subroutine so that it can be used for both SMTP
1425 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1428 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1429 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1430 smtp_reply_ptr Where SMTP reply is being built
1431 blackholed_by_ptr Where "blackholed by" message is being built
1433 Returns: TRUE to carry on; FALSE to abandon the message
1437 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1438 uschar **blackholed_by_ptr)
1441 uschar * rfc822_file_path = NULL;
1442 unsigned long mbox_size;
1443 uschar *user_msg, *log_msg;
1444 int mime_part_count_buffer = -1;
1445 uschar * mbox_filename;
1448 /* check if it is a MIME message */
1450 for (header_line * my_headerlist = header_list; my_headerlist;
1451 my_headerlist = my_headerlist->next)
1452 if ( my_headerlist->type != '*' /* skip deleted headers */
1453 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1456 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1460 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1465 /* make sure the eml mbox file is spooled up */
1466 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1467 { /* error while spooling */
1468 log_write(0, LOG_MAIN|LOG_PANIC,
1469 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1470 Uunlink(spool_name);
1472 #ifdef EXPERIMENTAL_DCC
1475 smtp_respond(US"451", 3, SR_FINAL, US"temporary local problem");
1476 message_id[0] = 0; /* Indicate no message accepted */
1477 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1478 return FALSE; /* Indicate skip to end of receive function */
1484 mime_part_count = -1;
1485 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1486 (void)fclose(mbox_file);
1488 if (rfc822_file_path)
1490 mime_part_count = mime_part_count_buffer;
1492 if (unlink(CS rfc822_file_path) == -1)
1494 log_write(0, LOG_PANIC,
1495 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1498 rfc822_file_path = NULL;
1501 /* check if we must check any message/rfc822 attachments */
1504 uschar * scandir = string_copyn(mbox_filename,
1505 Ustrrchr(mbox_filename, '/') - mbox_filename);
1506 struct dirent * entry;
1509 for (tempdir = exim_opendir(scandir); entry = readdir(tempdir); )
1510 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1512 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1514 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1520 if (rfc822_file_path)
1522 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1524 /* set RFC822 expansion variable */
1526 mime_part_count_buffer = mime_part_count;
1527 goto MIME_ACL_CHECK;
1529 log_write(0, LOG_PANIC,
1530 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1531 unlink(CS rfc822_file_path);
1536 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1539 recipients_count = 0;
1540 *blackholed_by_ptr = US"MIME ACL";
1541 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1545 Uunlink(spool_name);
1546 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1548 #ifdef EXPERIMENTAL_DCC
1553 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1554 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1555 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1557 message_id[0] = 0; /* Indicate no message accepted */
1558 return FALSE; /* Cause skip to end of receive function */
1564 #endif /* WITH_CONTENT_SCAN */
1569 received_header_gen(void)
1572 uschar * timestamp = expand_string(US"${tod_full}");
1573 header_line * received_header= header_list;
1575 if (recipients_count == 1) received_for = recipients_list[0].address;
1576 GET_OPTION("received_header_text");
1577 received = expand_string(received_header_text);
1578 received_for = NULL;
1582 if(spool_name[0] != 0)
1583 Uunlink(spool_name); /* Lose the data file */
1584 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1585 "(received_header_text) failed: %s", string_printing(received_header_text),
1586 expand_string_message);
1589 /* The first element on the header chain is reserved for the Received header,
1590 so all we have to do is fill in the text pointer, and set the type. However, if
1591 the result of the expansion is an empty string, we leave the header marked as
1592 "old" so as to refrain from adding a Received header. */
1596 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1597 received_header->type = htype_old;
1601 received_header->text = string_sprintf("%s;\n\t%s\n", received, timestamp);
1602 received_header->type = htype_received;
1605 received_header->slen = Ustrlen(received_header->text);
1607 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1608 received_header->type, received_header->text);
1613 /*************************************************
1615 *************************************************/
1617 /* Receive a message on the given input, and put it into a pair of spool files.
1618 Either a non-null list of recipients, or the extract flag will be true, or
1619 both. The flag sender_local is true for locally generated messages. The flag
1620 submission_mode is true if an ACL has obeyed "control = submission". The flag
1621 suppress_local_fixups is true if an ACL has obeyed "control =
1622 suppress_local_fixups" or -G was passed on the command-line.
1623 The flag smtp_input is true if the message is to be
1624 handled using SMTP conventions about termination and lines starting with dots.
1625 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1627 If a message was successfully read, message_id[0] will be non-zero.
1629 The general actions of this function are:
1631 . Read the headers of the message (if any) into a chain of store
1634 . If there is a "sender:" header and the message is locally originated,
1635 throw it away, unless the caller is trusted, or unless
1636 active_local_sender_retain is set - which can only happen if
1637 active_local_from_check is false.
1639 . If recipients are to be extracted from the message, build the
1640 recipients list from the headers, removing any that were on the
1641 original recipients list (unless extract_addresses_remove_arguments is
1642 false), and at the same time, remove any bcc header that may be present.
1644 . Get the spool file for the data, sort out its unique name, open
1645 and lock it (but don't give it the name yet).
1647 . Generate a "Message-Id" header if the message doesn't have one, for
1648 locally-originated messages.
1650 . Generate a "Received" header.
1652 . Ensure the recipients list is fully qualified and rewritten if necessary.
1654 . If there are any rewriting rules, apply them to the sender address
1655 and also to the headers.
1657 . If there is no from: header, generate one, for locally-generated messages
1658 and messages in "submission mode" only.
1660 . If the sender is local, check that from: is correct, and if not, generate
1661 a Sender: header, unless message comes from a trusted caller, or this
1662 feature is disabled by active_local_from_check being false.
1664 . If there is no "date" header, generate one, for locally-originated
1665 or submission mode messages only.
1667 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1668 dot_ends mode, to the data file. Leave it open, to hold the lock.
1670 . Write the envelope and the headers to a new file.
1672 . Set the name for the header file; close it.
1674 . Set the name for the data file; close it.
1676 Because this function can potentially be called many times in a single
1677 SMTP connection, all store should be got by store_get(), so that it will be
1678 automatically retrieved after the message is accepted.
1680 FUDGE: It seems that sites on the net send out messages with just LF
1681 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1682 we make the CRs optional in all cases.
1684 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1685 new regime is now in place in which bare CRs in header lines are turned into LF
1686 followed by a space, so as not to terminate the header line.
1688 February 2004: A bare LF in a header line in a message whose first line was
1689 terminated by CRLF is treated in the same way as a bare CR.
1692 extract_recip TRUE if recipients are to be extracted from the message's
1695 Returns: TRUE there are more messages to be read (SMTP input)
1696 FALSE there are no more messages to be read (non-SMTP input
1697 or SMTP connection collapsed, or other failure)
1699 When reading a message for filter testing, the returned value indicates
1700 whether the headers (which is all that is read) were terminated by '.' or
1704 receive_msg(BOOL extract_recip)
1708 int process_info_len = Ustrlen(process_info);
1709 int error_rc = error_handling == ERRORS_SENDER
1710 ? errors_sender_rc : EXIT_FAILURE;
1711 int header_size = 256;
1713 int prevlines_length = 0;
1714 const int id_resolution = BASE_62 == 62 && !host_number_string ? 1
1715 : BASE_62 != 62 && host_number_string ? 4
1720 BOOL contains_resent_headers = FALSE;
1721 BOOL extracted_ignored = FALSE;
1722 BOOL first_line_ended_crlf = TRUE_UNSET;
1723 BOOL smtp_yield = TRUE;
1726 BOOL resents_exist = FALSE;
1727 uschar *resent_prefix = US"";
1728 uschar *blackholed_by = NULL;
1729 uschar *blackhole_log_msg = US"";
1730 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1733 error_block *bad_addresses = NULL;
1735 uschar *frozen_by = NULL;
1736 uschar *queued_by = NULL;
1739 rmark rcvd_log_reset_point;
1741 struct stat statbuf;
1743 /* Final message to give to SMTP caller, and messages from ACLs */
1745 uschar *smtp_reply = NULL;
1746 uschar *user_msg, *log_msg;
1748 /* Working header pointers */
1753 /* Flags for noting the existence of certain headers (only one left) */
1755 BOOL date_header_exists = FALSE;
1757 /* Pointers to receive the addresses of headers whose contents we need. */
1759 header_line *from_header = NULL;
1760 header_line *subject_header = NULL;
1761 header_line *msgid_header = NULL;
1762 header_line *received_header;
1763 BOOL msgid_header_newly_created = FALSE;
1765 /* Variables for use when building the Received: header. */
1770 /* Time of creation of message_id */
1772 static struct timeval message_id_tv = { 0, 0 };
1775 /* Release any open files that might have been cached while preparing to
1776 accept the message - e.g. by verifying addresses - because reading a message
1777 might take a fair bit of real time. */
1781 /* Extracting the recipient list from an input file is incompatible with
1782 cutthrough delivery with the no-spool option. It shouldn't be possible
1783 to set up the combination, but just in case kill any ongoing connection. */
1784 if (extract_recip || !smtp_input)
1785 cancel_cutthrough_connection(TRUE, US"not smtp input");
1787 /* Initialize the chain of headers by setting up a place-holder for Received:
1788 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1789 pointing to the end of the chain to make adding headers simple. */
1791 received_header = header_list = header_last = store_get(sizeof(header_line), GET_UNTAINTED);
1792 header_list->next = NULL;
1793 header_list->type = htype_old;
1794 header_list->text = NULL;
1795 header_list->slen = 0;
1797 /* Control block for the next header to be read.
1798 The data comes from the message, so is tainted. */
1800 reset_point = store_mark();
1801 next = store_get(sizeof(header_line), GET_UNTAINTED);
1802 next->text = store_get(header_size, GET_TAINTED);
1804 /* Initialize message id to be null (indicating no message read), and the
1805 header names list to be the normal list. Indicate there is no data file open
1806 yet, initialize the size and warning count, and deal with no size limit. */
1809 spool_data_file = NULL;
1814 received_count = 1; /* For the one we will add */
1816 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1818 /* While reading the message, the following counts are computed. */
1820 message_linecount = body_linecount = body_zerocount =
1821 max_received_linelength = 0;
1823 #ifdef WITH_CONTENT_SCAN
1824 /* reset non-per-part mime variables */
1825 mime_is_coverletter = 0;
1827 mime_part_count = -1;
1830 #ifndef DISABLE_DKIM
1831 /* Call into DKIM to set up the context. In CHUNKING mode
1832 we clear the dot-stuffing flag */
1833 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1834 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1837 #ifdef SUPPORT_DMARC
1838 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1841 /* In SMTP sessions we may receive several messages in one connection. Before
1842 each subsequent one, we wait for the clock to tick at the level of message-id
1844 This is so that the combination of time+pid is unique, even on systems where the
1845 pid can be re-used within our time interval. We can't shorten the interval
1846 without re-designing the message-id. See comments above where the message id is
1847 created. This is Something For The Future.
1848 Do this wait any time we have previously created a message-id, even if we
1849 rejected the message. This gives unique IDs for logging done by ACLs.
1850 The initial timestamp must have been obtained via exim_gettime() to avoid
1851 issues on Linux with suspend/resume. */
1853 if (message_id_tv.tv_sec)
1855 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
1856 exim_wait_tick(&message_id_tv, id_resolution);
1859 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1860 ids, and fractions of a second are required. See the comments that precede the
1861 message id creation below.
1862 We use a routine that if possible uses a monotonic clock, and can be used again
1863 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1866 exim_gettime(&message_id_tv);
1868 /* For other uses of the received time we can operate with granularity of one
1869 second, and for that we use the global variable received_time. This is for
1870 things like ultimate message timeouts.
1871 For this we do not care about the Linux suspend/resume problem, so rather than
1872 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1874 gettimeofday(&received_time, NULL);
1876 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1877 happen in the smtp_getc() function when it refills its buffer. */
1879 had_data_timeout = 0;
1881 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1883 /* If not SMTP input, timeout happens only if configured, and we just set a
1884 single timeout for the whole message. */
1886 else if (receive_timeout > 0)
1888 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1889 ALARM(receive_timeout);
1892 /* SIGTERM and SIGINT are caught always. */
1894 had_data_sigint = 0;
1895 signal(SIGTERM, data_sigterm_sigint_handler);
1896 signal(SIGINT, data_sigterm_sigint_handler);
1898 /* Header lines in messages are not supposed to be very long, though when
1899 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1900 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1901 storing the header, and extend this as necessary using string_cat().
1903 To cope with total lunacies, impose an upper limit on the length of the header
1904 section of the message, as otherwise the store will fill up. We must also cope
1905 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1906 Folded header lines are joined into one string, leaving the '\n' characters
1907 inside them, so that writing them out reproduces the input.
1909 Loop for each character of each header; the next structure for chaining the
1910 header is set up already, with ptr the offset of the next character in
1915 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1917 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1918 SMTP must have a correct "." terminator. */
1920 if (smtp_input /* && !smtp_batched_input */)
1923 smtp_reply = handle_lost_connection(US" (header)");
1925 goto TIDYUP; /* Skip to end of function */
1930 /* See if we are at the current header's size limit - there must be at least
1931 four bytes left. This allows for the new character plus a zero, plus two for
1932 extra insertions when we are playing games with dots and carriage returns. If
1933 we are at the limit, extend the text buffer. This could have been done
1934 automatically using string_cat() but because this is a tightish loop storing
1935 only one character at a time, we choose to do it inline. Normally
1936 store_extend() will be able to extend the block; only at the end of a big
1937 store block will a copy be needed. To handle the case of very long headers
1938 (and sometimes lunatic messages can have ones that are 100s of K long) we
1939 call store_release() for strings that have been copied - if the string is at
1940 the start of a block (and therefore the only thing in it, because we aren't
1941 doing any other gets), the block gets freed. We can only do this release if
1942 there were no allocations since the once that we want to free. */
1944 if (ptr >= header_size - 4)
1946 int oldsize = header_size;
1948 if (header_size >= INT_MAX/2)
1952 if (!store_extend(next->text, oldsize, header_size))
1953 next->text = store_newblock(next->text, header_size, ptr);
1956 /* Cope with receiving a binary zero. There is dispute about whether
1957 these should be allowed in RFC 822 messages. The middle view is that they
1958 should not be allowed in headers, at least. Exim takes this attitude at
1959 the moment. We can't just stomp on them here, because we don't know that
1960 this line is a header yet. Set a flag to cause scanning later. */
1962 if (ch == 0) had_zero++;
1964 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1965 those from data files use just LF. Treat LF in local SMTP input as a
1966 terminator too. Treat EOF as a line terminator always. */
1968 if (ch < 0) goto EOL;
1970 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1971 other MTAs accept this. We are therefore forced into this "liberalisation"
1972 too, so we accept LF as a line terminator whatever the source of the message.
1973 However, if the first line of the message ended with a CRLF, we treat a bare
1974 LF specially by inserting a white space after it to ensure that the header
1975 line is not terminated. */
1979 if (first_line_ended_crlf == TRUE_UNSET)
1980 first_line_ended_crlf = FALSE;
1981 else if (first_line_ended_crlf)
1982 receive_ungetc(' ');
1986 /* This is not the end of the line. If this is SMTP input and this is
1987 the first character in the line and it is a "." character, ignore it.
1988 This implements the dot-doubling rule, though header lines starting with
1989 dots aren't exactly common. They are legal in RFC 822, though. If the
1990 following is CRLF or LF, this is the line that that terminates the
1992 entire message. We set message_ended to indicate this has happened (to
1993 prevent further reading), and break out of the loop, having freed the
1994 empty header, and set next = NULL to indicate no data line. */
1996 if (f.dot_ends && ptr == 0 && ch == '.')
1998 /* leading dot while in headers-read mode */
1999 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2000 if (ch == '\n' && first_line_ended_crlf == TRUE /* and not TRUE_UNSET */ )
2001 /* dot, LF but we are in CRLF mode. Attack? */
2002 ch = ' '; /* replace the LF with a space */
2004 else if (ch == '\r')
2006 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2009 if (ch >= 0) receive_ungetc(ch);
2010 ch = '\r'; /* Revert to CR */
2015 message_ended = END_DOT;
2016 reset_point = store_reset(reset_point);
2018 break; /* End character-reading loop */
2021 /* For non-SMTP input, the dot at the start of the line was really a data
2022 character. What is now in ch is the following character. We guaranteed
2023 enough space for this above. */
2027 next->text[ptr++] = '.';
2032 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
2033 remember this case if this is the first line ending. */
2037 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2040 if (first_line_ended_crlf == TRUE_UNSET)
2041 first_line_ended_crlf = TRUE;
2045 /* Otherwise, put back the character after CR, and turn the bare CR
2048 if (ch >= 0) (receive_ungetc)(ch);
2049 next->text[ptr++] = '\n';
2054 /* We have a data character for the header line. */
2056 next->text[ptr++] = ch; /* Add to buffer */
2057 message_size++; /* Total message size so far */
2059 /* Handle failure due to a humungously long header section. The >= allows
2060 for the terminating \n. Add what we have so far onto the headers list so
2061 that it gets reflected in any error message, and back up the just-read
2064 if (message_size >= header_maxsize)
2067 next->text[ptr] = 0;
2069 next->type = htype_other;
2071 header_last->next = next;
2074 log_write(0, LOG_MAIN, "ridiculously long message header received from "
2075 "%s (more than %d characters): message abandoned",
2076 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
2080 smtp_reply = US"552 Message header is ridiculously long";
2081 receive_swallow_smtp();
2082 goto TIDYUP; /* Skip to end of function */
2087 give_local_error(ERRMESS_VLONGHEADER,
2088 string_sprintf("message header longer than %d characters received: "
2089 "message not accepted", header_maxsize), US"", error_rc, stdin,
2091 /* Does not return */
2095 continue; /* With next input character */
2097 /* End of header line reached */
2101 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2103 receive_linecount++;
2104 message_linecount++;
2106 /* Keep track of maximum line length */
2108 if (ptr - prevlines_length > max_received_linelength)
2109 max_received_linelength = ptr - prevlines_length;
2110 prevlines_length = ptr + 1;
2112 /* Now put in the terminating newline. There is always space for
2113 at least two more characters. */
2115 next->text[ptr++] = '\n';
2118 /* A blank line signals the end of the headers; release the unwanted
2119 space and set next to NULL to indicate this. */
2123 reset_point = store_reset(reset_point);
2128 /* There is data in the line; see if the next input character is a
2129 whitespace character. If it is, we have a continuation of this header line.
2130 There is always space for at least one character at this point. */
2134 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2135 if (nextch == ' ' || nextch == '\t')
2137 next->text[ptr++] = nextch;
2138 if (++message_size >= header_maxsize)
2140 continue; /* Iterate the loop */
2142 else if (nextch >= 0) /* not EOF, ERR etc */
2143 (receive_ungetc)(nextch); /* For next time */
2144 else ch = nextch; /* Cause main loop to exit at end */
2147 /* We have got to the real line end. Terminate the string and release store
2148 beyond it. If it turns out to be a real header, internal binary zeros will
2149 be squashed later. */
2151 next->text[ptr] = 0;
2153 store_release_above(next->text + ptr + 1);
2155 /* Check the running total size against the overall message size limit. We
2156 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2157 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2158 headers - the code to read the body will then also hit the buffer. */
2160 if (message_size > thismessage_size_limit) break;
2162 /* A line that is not syntactically correct for a header also marks
2163 the end of the headers. In this case, we leave next containing the
2164 first data line. This might actually be several lines because of the
2165 continuation logic applied above, but that doesn't matter.
2167 It turns out that smail, and presumably sendmail, accept leading lines
2170 From ph10 Fri Jan 5 12:35 GMT 1996
2172 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2173 find any documentation of this, but for compatibility it had better be
2174 accepted. Exim restricts it to the case of non-smtp messages, and
2175 treats it as an alternative to the -f command line option. Thus it is
2176 ignored except for trusted users or filter testing. Otherwise it is taken
2177 as the sender address, unless -f was used (sendmail compatibility).
2179 It further turns out that some UUCPs generate the From_line in a different
2182 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2184 The regex for matching these things is now capable of recognizing both
2185 formats (including 2- and 4-digit years in the latter). In fact, the regex
2186 is now configurable, as is the expansion string to fish out the sender.
2188 Even further on it has been discovered that some broken clients send
2189 these lines in SMTP messages. There is now an option to ignore them from
2190 specified hosts or networks. Sigh. */
2192 if ( header_last == header_list
2194 || ( sender_host_address
2195 && verify_check_host(&ignore_fromline_hosts) == OK
2197 || (!sender_host_address && ignore_fromline_local)
2199 && regex_match_and_setup(regex_From, next->text, 0, -1)
2202 if (!f.sender_address_forced)
2204 uschar * uucp_sender;
2205 GET_OPTION("uucp_from_sender");
2206 if (!(uucp_sender = expand_string(uucp_from_sender)))
2207 log_write(0, LOG_MAIN|LOG_PANIC,
2208 "expansion of \"%s\" failed after matching "
2209 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2212 int start, end, domain;
2214 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2215 &start, &end, &domain, TRUE);
2218 if (domain == 0 && newsender[0] != 0)
2219 /* deconst ok as newsender was not const */
2220 newsender = US rewrite_address_qualify(newsender, FALSE);
2222 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2224 sender_address = newsender;
2226 if (f.trusted_caller || filter_test != FTEST_NONE)
2228 authenticated_sender = NULL;
2229 originator_name = US"";
2230 f.sender_local = FALSE;
2233 if (filter_test != FTEST_NONE)
2234 printf("Sender taken from \"From \" line\n");
2241 /* Not a leading "From " line. Check to see if it is a valid header line.
2242 Header names may contain any non-control characters except space and colon,
2247 uschar * p = next->text;
2249 /* If not a valid header line, break from the header reading loop, leaving
2250 next != NULL, indicating that it holds the first line of the body. */
2252 if (isspace(*p)) break;
2253 while (mac_isgraph(*p) && *p != ':') p++;
2254 while (isspace(*p)) p++;
2257 body_zerocount = had_zero;
2261 /* We have a valid header line. If there were any binary zeroes in
2262 the line, stomp on them here. */
2265 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2268 /* It is perfectly legal to have an empty continuation line
2269 at the end of a header, but it is confusing to humans
2270 looking at such messages, since it looks like a blank line.
2271 Reduce confusion by removing redundant white space at the
2272 end. We know that there is at least one printing character
2273 (the ':' tested for above) so there is no danger of running
2276 p = next->text + ptr - 2;
2279 while (*p == ' ' || *p == '\t') p--;
2280 if (*p != '\n') break;
2281 ptr = (p--) - next->text + 1;
2282 message_size -= next->slen - ptr;
2283 next->text[ptr] = 0;
2287 /* Add the header to the chain */
2289 next->type = htype_other;
2291 header_last->next = next;
2294 /* Check the limit for individual line lengths. This comes after adding to
2295 the chain so that the failing line is reflected if a bounce is generated
2296 (for a local message). */
2298 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2300 log_write(0, LOG_MAIN, "overlong message header line received from "
2301 "%s (more than %d characters): message abandoned",
2302 f.sender_host_unknown ? sender_ident : sender_fullhost,
2303 header_line_maxsize);
2307 smtp_reply = US"552 A message header line is too long";
2308 receive_swallow_smtp();
2309 goto TIDYUP; /* Skip to end of function */
2313 give_local_error(ERRMESS_VLONGHDRLINE,
2314 string_sprintf("message header line longer than %d characters "
2315 "received: message not accepted", header_line_maxsize), US"",
2316 error_rc, stdin, header_list->next);
2317 /* Does not return */
2320 /* Note if any resent- fields exist. */
2322 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2324 resents_exist = TRUE;
2325 resent_prefix = US"Resent-";
2329 /* Reject CHUNKING messages that do not CRLF their first header line */
2331 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2333 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2334 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2336 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2337 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2338 smtp_printf("552 Message header not CRLF terminated\r\n", SP_NO_MORE);
2341 goto TIDYUP; /* Skip to end of function */
2344 /* The line has been handled. If we have hit EOF, break out of the loop,
2345 indicating no pending data line and no more data for the message */
2350 if (ch == EOF) message_ended = END_DOT;
2351 else if (ch == ERR) message_ended = END_PROTOCOL;
2355 /* Set up for the next header */
2357 reset_point = store_mark();
2359 next = store_get(sizeof(header_line), GET_UNTAINTED);
2360 next->text = store_get(header_size, GET_TAINTED);
2363 prevlines_length = 0;
2364 } /* Continue, starting to read the next header */
2366 /* At this point, we have read all the headers into a data structure in main
2367 store. The first header is still the dummy placeholder for the Received: header
2368 we are going to generate a bit later on. If next != NULL, it contains the first
2369 data line - which terminated the headers before reaching a blank line (not the
2374 debug_printf(">>Headers received:\n");
2375 for (header_line * h = header_list->next; h; h = h->next)
2376 debug_printf("%s", h->text);
2380 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2381 is dropped immediately after valid headers, the next thing we will see is EOF.
2382 We must test for this specially, as further down the reading of the data is
2383 skipped if already at EOF.
2384 In CHUNKING mode, a protocol error makes us give up on the message. */
2387 if ((receive_feof)())
2389 smtp_reply = handle_lost_connection(US" (after header)");
2391 goto TIDYUP; /* Skip to end of function */
2393 else if (message_ended == END_PROTOCOL)
2395 smtp_reply = US""; /* no reply needed */
2399 /* If this is a filter test run and no headers were read, output a warning
2400 in case there is a mistake in the test message. */
2402 if (filter_test != FTEST_NONE && header_list->next == NULL)
2403 printf("Warning: no message headers read\n");
2406 /* Scan the headers to identify them. Some are merely marked for later
2407 processing; some are dealt with here. */
2409 for (header_line * h = header_list->next; h; h = h->next)
2411 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2412 if (is_resent) contains_resent_headers = TRUE;
2414 switch (header_checkname(h, is_resent))
2417 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2421 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2424 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2427 if (!resents_exist || is_resent) date_header_exists = TRUE;
2430 /* Same comments as about Return-Path: below. */
2432 case htype_delivery_date:
2433 if (delivery_date_remove) h->type = htype_old;
2436 /* Same comments as about Return-Path: below. */
2438 case htype_envelope_to:
2439 if (envelope_to_remove) h->type = htype_old;
2442 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2443 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2444 header consists of just the login id of the user who called Exim, rewrite
2445 it with the gecos field first. Apply this rule to Resent-From: if there
2446 are resent- fields. */
2449 h->type = htype_from;
2450 if (!resents_exist || is_resent)
2456 uschar *s = Ustrchr(h->text, ':') + 1;
2457 while (isspace(*s)) s++;
2458 len = h->slen - (s - h->text) - 1;
2459 if (Ustrlen(originator_login) == len &&
2460 strncmpic(s, originator_login, len) == 0)
2462 uschar *name = is_resent? US"Resent-From" : US"From";
2463 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2464 originator_login, qualify_domain_sender);
2465 from_header = header_last;
2466 h->type = htype_old;
2467 DEBUG(D_receive|D_rewrite)
2468 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2474 /* Identify the Message-id: header for generating "in-reply-to" in the
2475 autoreply transport. For incoming logging, save any resent- value. In both
2476 cases, take just the first of any multiples. */
2479 if (!msgid_header && (!resents_exist || is_resent))
2486 /* Flag all Received: headers */
2488 case htype_received:
2489 h->type = htype_received;
2493 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2495 case htype_reply_to:
2496 h->type = htype_reply_to;
2499 /* The Return-path: header is supposed to be added to messages when
2500 they leave the SMTP system. We shouldn't receive messages that already
2501 contain Return-path. However, since Exim generates Return-path: on
2502 local delivery, resent messages may well contain it. We therefore
2503 provide an option (which defaults on) to remove any Return-path: headers
2504 on input. Removal actually means flagging as "old", which prevents the
2505 header being transmitted with the message. */
2507 case htype_return_path:
2508 if (return_path_remove) h->type = htype_old;
2510 /* If we are testing a mail filter file, use the value of the
2511 Return-Path: header to set up the return_path variable, which is not
2512 otherwise set. However, remove any <> that surround the address
2513 because the variable doesn't have these. */
2515 if (filter_test != FTEST_NONE)
2517 uschar *start = h->text + 12;
2518 uschar *end = start + Ustrlen(start);
2519 while (isspace(*start)) start++;
2520 while (end > start && isspace(end[-1])) end--;
2521 if (*start == '<' && end[-1] == '>')
2526 return_path = string_copyn(start, end - start);
2527 printf("Return-path taken from \"Return-path:\" header line\n");
2531 /* If there is a "Sender:" header and the message is locally originated,
2532 and from an untrusted caller and suppress_local_fixups is not set, or if we
2533 are in submission mode for a remote message, mark it "old" so that it will
2534 not be transmitted with the message, unless active_local_sender_retain is
2535 set. (This can only be true if active_local_from_check is false.) If there
2536 are any resent- headers in the message, apply this rule to Resent-Sender:
2537 instead of Sender:. Messages with multiple resent- header sets cannot be
2538 tidily handled. (For this reason, at least one MUA - Pine - turns old
2539 resent- headers into X-resent- headers when resending, leaving just one
2543 h->type = !f.active_local_sender_retain
2544 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2545 || f.submission_mode
2547 && (!resents_exist || is_resent)
2548 ? htype_old : htype_sender;
2551 /* Remember the Subject: header for logging. There is no Resent-Subject */
2557 /* "To:" gets flagged, and the existence of a recipient header is noted,
2558 whether it's resent- or not. */
2563 to_or_cc_header_exists = TRUE;
2569 /* Extract recipients from the headers if that is required (the -t option).
2570 Note that this is documented as being done *before* any address rewriting takes
2571 place. There are two possibilities:
2573 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2574 recipients already listed are to be REMOVED from the message. Smail 3 works
2575 like this. We need to build a non-recipients tree for that list, because in
2576 subsequent processing this data is held in a tree and that's what the
2577 spool_write_header() function expects. Make sure that non-recipient addresses
2578 are fully qualified and rewritten if necessary.
2580 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2581 those in the command line arguments (and it is rumoured some other MTAs do
2582 this). Therefore, there is an option to make Exim behave this way.
2584 *** Notes on "Resent-" header lines ***
2586 The presence of resent-headers in the message makes -t horribly ambiguous.
2587 Experiments with sendmail showed that it uses recipients for all resent-
2588 headers, totally ignoring the concept of "sets of resent- headers" as described
2589 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2590 with all the addresses in one instance of each header.
2592 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2593 error for -t if there were resent- headers in the message. However, after a
2594 discussion on the mailing list, I've learned that there are MUAs that use
2595 resent- headers with -t, and also that the stuff about sets of resent- headers
2596 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2597 message with -t and resent- header lines makes sure that only *its* resent-
2598 headers are present; previous ones are often renamed as X-resent- for example.
2600 Consequently, Exim has been changed so that, if any resent- header lines are
2601 present, the recipients are taken from all of the appropriate resent- lines,
2602 and not from the ordinary To:, Cc:, etc. */
2607 error_block **bnext = &bad_addresses;
2609 if (extract_addresses_remove_arguments)
2611 while (recipients_count-- > 0)
2613 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2614 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2615 tree_add_nonrecipient(s);
2617 recipients_list = NULL;
2618 recipients_count = recipients_list_max = 0;
2621 /* Now scan the headers */
2623 for (header_line * h = header_list->next; h; h = h->next)
2625 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2626 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2628 uschar * s = Ustrchr(h->text, ':') + 1;
2629 while (isspace(*s)) s++;
2631 f.parse_allow_group = TRUE; /* Allow address group syntax */
2635 uschar *ss = parse_find_address_end(s, FALSE);
2636 uschar *recipient, *errmess, *pp;
2637 int start, end, domain;
2639 /* Check on maximum */
2641 if (recipients_max_expanded > 0 && ++rcount > recipients_max_expanded)
2642 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2643 US"message rejected: ", error_rc, stdin, NULL);
2644 /* Does not return */
2646 /* Make a copy of the address, and remove any internal newlines. These
2647 may be present as a result of continuations of the header line. The
2648 white space that follows the newline must not be removed - it is part
2651 pp = recipient = store_get(ss - s + 1, s);
2652 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2657 BOOL b = allow_utf8_domains;
2658 allow_utf8_domains = TRUE;
2660 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2665 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2666 else allow_utf8_domains = b;
2672 /* Keep a list of all the bad addresses so we can send a single
2673 error message at the end. However, an empty address is not an error;
2674 just ignore it. This can come from an empty group list like
2676 To: Recipients of list:;
2678 If there are no recipients at all, an error will occur later. */
2680 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2682 int len = Ustrlen(s);
2683 error_block * b = store_get(sizeof(error_block), GET_UNTAINTED);
2684 while (len > 0 && isspace(s[len-1])) len--;
2686 b->text1 = string_printing(string_copyn(s, len));
2692 /* If the recipient is already in the nonrecipients tree, it must
2693 have appeared on the command line with the option extract_addresses_
2694 remove_arguments set. Do not add it to the recipients, and keep a note
2695 that this has happened, in order to give a better error if there are
2696 no recipients left. */
2700 if (tree_search(tree_nonrecipients, recipient) == NULL)
2701 receive_add_recipient(recipient, -1);
2703 extracted_ignored = TRUE;
2706 /* Move on past this address */
2708 s = ss + (*ss ? 1 : 0);
2709 while (isspace(*s)) s++;
2710 } /* Next address */
2712 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2713 f.parse_found_group = FALSE;
2715 /* If this was the bcc: header, mark it "old", which means it
2716 will be kept on the spool, but not transmitted as part of the
2719 if (h->type == htype_bcc) h->type = htype_old;
2720 } /* For appropriate header line */
2721 } /* For each header line */
2725 /* Now build the unique message id. This has changed several times over the
2726 lifetime of Exim, and is changing for Exim 4.97.
2727 The previous change was in about 2003.
2729 Detail for the pre-4.97 version is here in [square-brackets].
2731 The message ID has 3 parts: tttttt-ppppppppppp-ssss (6, 11, 4 - total 23 with
2732 the dashes). Each part is a number in base 62.
2733 [ tttttt-pppppp-ss 6, 6, 2 => 16 ]
2735 The first part is the current time, in seconds. Six chars is enough until
2736 year 3700 with case-sensitive filesystes, but will run out in 2038 on
2737 case-insensitive ones (Cygwin, Darwin - where we have to use base-36.
2738 Both of those are in the "unsupported" bucket, so ignore for now).
2740 The second part is the current pid, and supports 64b [31b] PIDs.
2742 The third part holds sub-second time, plus (when localhost_number is set)
2743 the host number multiplied by a number large enough to keep it away from
2744 the time portion. Host numbers are restricted to the range 0-16.
2745 The time resolution is variously 1, 2 or 4 microseconds [0.5 or 1 ms]
2746 depending on the use of localhost_nubmer and of case-insensitive filesystems.
2748 After a message has been received, Exim ensures that the timer has ticked at the
2749 appropriate level before proceeding, to avoid duplication if the pid happened to
2750 be re-used within the same time period. It seems likely that most messages will
2751 take at least half a millisecond to be received, so no delay will normally be
2752 necessary. At least for some time...
2754 Note that string_base62_XX() returns its data in a static storage block, so it
2755 must be copied before calling string_base62_XXX) again. It always returns exactly
2756 11 (_64) or 6 (_32) characters.
2758 There doesn't seem to be anything in the RFC which requires a message id to
2759 start with a letter, but Smail was changed to ensure this. The external form of
2760 the message id (as supplied by string expansion) therefore starts with an
2761 additional leading 'E'. The spool file names do not include this leading
2762 letter and it is not used internally.
2764 NOTE: If ever the format of message ids is changed, the regular expression for
2765 checking that a string is in this format must be updated in a corresponding
2766 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2767 must also be changed to reflect the correct string length. The queue-sort code
2768 needs to know the layout. Then, of course, other programs that rely on the
2769 message id format will need updating too (inc. at least exim_msgdate). */
2771 Ustrncpy(message_id, string_base62_32((long int)(message_id_tv.tv_sec)), MESSAGE_ID_TIME_LEN);
2772 message_id[MESSAGE_ID_TIME_LEN] = '-';
2773 Ustrncpy(message_id + MESSAGE_ID_TIME_LEN + 1,
2774 string_base62_64((long int)getpid()),
2778 /* Deal with the case where the host number is set. The value of the number was
2779 checked when it was read, to ensure it isn't too big. */
2781 if (host_number_string)
2782 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2783 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2784 string_base62_32((long int)(
2785 host_number * (1000000/id_resolution)
2786 + message_id_tv.tv_usec/id_resolution))
2787 + (6 - MESSAGE_ID_SUBTIME_LEN)
2790 /* Host number not set: final field is just the fractional time at an
2791 appropriate resolution. */
2794 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2795 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2796 string_base62_32((long int)(message_id_tv.tv_usec/id_resolution))
2797 + (6 - MESSAGE_ID_SUBTIME_LEN));
2799 /* Add the current message id onto the current process info string if
2802 (void)string_format(process_info + process_info_len,
2803 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2805 /* If we are using multiple input directories, set up the one for this message
2806 to be the least significant base-62 digit of the time of arrival. Otherwise
2807 ensure that it is an empty string. */
2809 set_subdir_str(message_subdir, message_id, 0);
2811 /* Now that we have the message-id, if there is no message-id: header, generate
2812 one, but only for local (without suppress_local_fixups) or submission mode
2813 messages. This can be user-configured if required, but we had better flatten
2814 any illegal characters therein. */
2817 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2819 uschar *id_text = US"";
2820 uschar *id_domain = primary_hostname;
2823 /* Permit only letters, digits, dots, and hyphens in the domain */
2825 GET_OPTION("message_id_header_domain");
2826 if (message_id_domain)
2828 uschar *new_id_domain = expand_string(message_id_domain);
2831 if (!f.expand_string_forcedfail)
2832 log_write(0, LOG_MAIN|LOG_PANIC,
2833 "expansion of \"%s\" (message_id_header_domain) "
2834 "failed: %s", message_id_domain, expand_string_message);
2836 else if (*new_id_domain)
2838 id_domain = new_id_domain;
2839 for (uschar * p = id_domain; *p; p++)
2840 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2844 /* Permit all characters except controls and RFC 2822 specials in the
2845 additional text part. */
2847 GET_OPTION("message_id_header_text");
2848 if (message_id_text)
2850 uschar *new_id_text = expand_string(message_id_text);
2853 if (!f.expand_string_forcedfail)
2854 log_write(0, LOG_MAIN|LOG_PANIC,
2855 "expansion of \"%s\" (message_id_header_text) "
2856 "failed: %s", message_id_text, expand_string_message);
2858 else if (*new_id_text)
2860 id_text = new_id_text;
2861 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2865 /* Add the header line.
2866 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2867 appended, to preserve classical expectations of header ordering. */
2869 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2870 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2871 *id_text == 0 ? "" : ".", id_text, id_domain);
2873 /* Arrange for newly-created Message-Id to be logged */
2877 msgid_header_newly_created = TRUE;
2882 /* If we are to log recipients, keep a copy of the raw ones before any possible
2883 rewriting. Must copy the count, because later ACLs and the local_scan()
2884 function may mess with the real recipients. */
2886 if (LOGGING(received_recipients))
2888 raw_recipients = store_get(recipients_count * sizeof(uschar *), GET_UNTAINTED);
2889 for (int i = 0; i < recipients_count; i++)
2890 raw_recipients[i] = string_copy(recipients_list[i].address);
2891 raw_recipients_count = recipients_count;
2894 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2895 recipients will get here only if the conditions were right (allow_unqualified_
2896 recipient is TRUE). */
2899 { debug_printf_indent("qualify & rewrite recipients list\n"); acl_level++; }
2900 for (int i = 0; i < recipients_count; i++)
2901 recipients_list[i].address = /* deconst ok as src was not cont */
2902 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2903 global_rewrite_rules, rewrite_existflags);
2904 DEBUG(D_rewrite) acl_level--;
2906 /* If there is no From: header, generate one for local (without
2907 suppress_local_fixups) or submission_mode messages. If there is no sender
2908 address, but the sender is local or this is a local delivery error, use the
2909 originator login. This shouldn't happen for genuine bounces, but might happen
2910 for autoreplies. The addition of From: must be done *before* checking for the
2911 possible addition of a Sender: header, because untrusted_set_sender allows an
2912 untrusted user to set anything in the envelope (which might then get info
2913 From:) but we still want to ensure a valid Sender: if it is required. */
2916 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2918 const uschar * oname = US"";
2920 /* Use the originator_name if this is a locally submitted message and the
2921 caller is not trusted. For trusted callers, use it only if -F was used to
2922 force its value or if we have a non-SMTP message for which -f was not used
2923 to set the sender. */
2925 if (!sender_host_address)
2927 if (!f.trusted_caller || f.sender_name_forced ||
2928 (!smtp_input && !f.sender_address_forced))
2929 oname = originator_name;
2932 /* For non-locally submitted messages, the only time we use the originator
2933 name is when it was forced by the /name= option on control=submission. */
2935 else if (submission_name) oname = submission_name;
2937 /* Envelope sender is empty */
2939 if (!*sender_address)
2941 uschar *fromstart, *fromend;
2943 fromstart = string_sprintf("%sFrom: %s%s",
2944 resent_prefix, oname, *oname ? " <" : "");
2945 fromend = *oname ? US">" : US"";
2947 if (f.sender_local || f.local_error_message)
2948 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2949 local_part_quote(originator_login), qualify_domain_sender,
2952 else if (f.submission_mode && authenticated_id)
2954 if (!submission_domain)
2955 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2956 local_part_quote(authenticated_id), qualify_domain_sender,
2959 else if (!*submission_domain) /* empty => whole address set */
2960 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2964 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2965 local_part_quote(authenticated_id), submission_domain, fromend);
2967 from_header = header_last; /* To get it checked for Sender: */
2971 /* There is a non-null envelope sender. Build the header using the original
2972 sender address, before any rewriting that might have been done while
2977 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2980 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2983 from_header = header_last; /* To get it checked for Sender: */
2988 /* If the sender is local (without suppress_local_fixups), or if we are in
2989 submission mode and there is an authenticated_id, check that an existing From:
2990 is correct, and if not, generate a Sender: header, unless disabled. Any
2991 previously-existing Sender: header was removed above. Note that sender_local,
2992 as well as being TRUE if the caller of exim is not trusted, is also true if a
2993 trusted caller did not supply a -f argument for non-smtp input. To allow
2994 trusted callers to forge From: without supplying -f, we have to test explicitly
2995 here. If the From: header contains more than one address, then the call to
2996 parse_extract_address fails, and a Sender: header is inserted, as required. */
2999 && ( f.active_local_from_check
3000 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
3001 || f.submission_mode && authenticated_id
3004 BOOL make_sender = TRUE;
3005 int start, end, domain;
3007 uschar *from_address =
3008 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
3009 &start, &end, &domain, FALSE);
3010 uschar *generated_sender_address;
3012 generated_sender_address = f.submission_mode
3013 ? !submission_domain
3014 ? string_sprintf("%s@%s",
3015 local_part_quote(authenticated_id), qualify_domain_sender)
3016 : !*submission_domain /* empty => full address */
3017 ? string_sprintf("%s", authenticated_id)
3018 : string_sprintf("%s@%s",
3019 local_part_quote(authenticated_id), submission_domain)
3020 : string_sprintf("%s@%s",
3021 local_part_quote(originator_login), qualify_domain_sender);
3023 /* Remove permitted prefixes and suffixes from the local part of the From:
3024 address before doing the comparison with the generated sender. */
3029 uschar *at = domain ? from_address + domain - 1 : NULL;
3032 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
3033 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
3035 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
3036 from_address += slen;
3040 if ( strcmpic(generated_sender_address, from_address) == 0
3041 || (!domain && strcmpic(from_address, originator_login) == 0))
3042 make_sender = FALSE;
3045 /* We have to cause the Sender header to be rewritten if there are
3046 appropriate rewriting rules. */
3049 if (f.submission_mode && !submission_name)
3050 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
3051 generated_sender_address);
3053 header_add(htype_sender, "%sSender: %s <%s>\n",
3055 f.submission_mode ? submission_name : originator_name,
3056 generated_sender_address);
3058 /* Ensure that a non-null envelope sender address corresponds to the
3059 submission mode sender address. */
3061 if (f.submission_mode && *sender_address)
3063 if (!sender_address_unrewritten)
3064 sender_address_unrewritten = sender_address;
3065 sender_address = generated_sender_address;
3066 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
3067 log_write(L_address_rewrite, LOG_MAIN,
3068 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
3069 sender_address_unrewritten, generated_sender_address);
3073 /* If there are any rewriting rules, apply them to the sender address, unless
3074 it has already been rewritten as part of verification for SMTP input. */
3077 { debug_printf("rewrite rules on sender address\n"); acl_level++; }
3078 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
3080 /* deconst ok as src was not const */
3081 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
3082 global_rewrite_rules, rewrite_existflags);
3083 DEBUG(D_receive|D_rewrite)
3084 debug_printf("rewritten sender = %s\n", sender_address);
3086 DEBUG(D_rewrite) acl_level--;
3089 /* The headers must be run through rewrite_header(), because it ensures that
3090 addresses are fully qualified, as well as applying any rewriting rules that may
3093 Qualification of header addresses in a message from a remote host happens only
3094 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
3095 appropriate. For local messages, qualification always happens, unless -bnq is
3096 used to explicitly suppress it. No rewriting is done for an unqualified address
3097 that is left untouched.
3099 We start at the second header, skipping our own Received:. This rewriting is
3100 documented as happening *after* recipient addresses are taken from the headers
3101 by the -t command line option. An added Sender: gets rewritten here. */
3104 { debug_printf("qualify and rewrite headers\n"); acl_level++; }
3105 for (header_line * h = header_list->next, * newh; h; h = h->next)
3106 if ((newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3107 rewrite_existflags, TRUE)))
3109 DEBUG(D_rewrite) acl_level--;
3112 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3113 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3114 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3115 exists, this applies to the set of resent- headers rather than the normal set.
3117 The requirement for a recipient header has been removed in RFC 2822. At this
3118 point in the code, earlier versions of Exim added a To: header for locally
3119 submitted messages, and an empty Bcc: header for others. In the light of the
3120 changes in RFC 2822, this was dropped in November 2003. */
3123 /* If there is no date header, generate one if the message originates locally
3124 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3125 submission mode flag is set. Messages without Date: are not valid, but it seems
3126 to be more confusing if Exim adds one to all remotely-originated messages.
3127 As per Message-Id, we prepend if resending, else append.
3130 if ( !date_header_exists
3131 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3132 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3133 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3135 search_tidyup(); /* Free any cached resources */
3137 /* Show the complete set of headers if debugging. Note that the first one (the
3138 new Received:) has not yet been set. */
3142 debug_printf(">>Headers after rewriting and local additions:\n");
3144 for (header_line * h = header_list->next; h; h = h->next)
3145 debug_printf_indent("%c %s", h->type, h->text);
3150 /* The headers are now complete in store. If we are running in filter
3151 testing mode, that is all this function does. Return TRUE if the message
3152 ended with a dot. */
3154 if (filter_test != FTEST_NONE)
3156 process_info[process_info_len] = 0;
3157 return message_ended == END_DOT;
3160 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3161 think more if it could be handled. Cannot do onward CHUNKING unless
3162 inbound is, but inbound chunking ought to be ok with outbound plain.
3163 Could we do onward CHUNKING given inbound CHUNKING?
3165 if (chunking_state > CHUNKING_OFFERED)
3166 cancel_cutthrough_connection(FALSE, US"chunking active");
3168 /* Cutthrough delivery:
3169 We have to create the Received header now rather than at the end of reception,
3170 so the timestamp behaviour is a change to the normal case.
3171 Having created it, send the headers to the destination. */
3173 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3175 if (received_count > received_headers_max)
3177 cancel_cutthrough_connection(TRUE, US"too many headers");
3178 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3179 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3180 "Too many \"Received\" headers",
3182 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3183 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3184 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3185 goto NOT_ACCEPTED; /* Skip to end of function */
3187 received_header_gen();
3188 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3189 (void) cutthrough_headers_send();
3193 /* Open a new spool file for the data portion of the message. We need
3194 to access it both via a file descriptor and a stdio stream. Try to make the
3195 directory if it isn't there. */
3197 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3198 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3200 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3202 if (errno == ENOENT)
3204 (void) directory_make(spool_directory,
3205 spool_sname(US"input", message_subdir),
3206 INPUT_DIRECTORY_MODE, TRUE);
3207 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3210 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3211 spool_name, strerror(errno));
3214 /* Make sure the file's group is the Exim gid, and double-check the mode
3215 because the group setting doesn't always get set automatically. */
3217 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3218 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3219 "Failed setting ownership on spool file %s: %s",
3220 spool_name, strerror(errno));
3221 (void)fchmod(data_fd, SPOOL_MODE);
3223 /* We now have data file open. Build a stream for it and lock it. We lock only
3224 the first line of the file (containing the message ID) because otherwise there
3225 are problems when Exim is run under Cygwin (I'm told). See comments in
3226 spool_in.c, where the same locking is done. */
3228 spool_data_file = fdopen(data_fd, "w+");
3229 lock_data.l_type = F_WRLCK;
3230 lock_data.l_whence = SEEK_SET;
3231 lock_data.l_start = 0;
3232 lock_data.l_len = spool_data_start_offset(message_id);
3234 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3235 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3236 errno, strerror(errno));
3238 /* We have an open, locked data file. Write the message id to it to make it
3239 self-identifying. Then read the remainder of the input of this message and
3240 write it to the data file. If the variable next != NULL, it contains the first
3241 data line (which was read as a header but then turned out not to have the right
3242 format); write it (remembering that it might contain binary zeros). The result
3243 of fwrite() isn't inspected; instead we call ferror() below. */
3245 fprintf(spool_data_file, "%s-D\n", message_id);
3248 uschar *s = next->text;
3249 int len = next->slen;
3250 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3251 body_linecount++; /* Assumes only 1 line */
3254 /* Note that we might already be at end of file, or the logical end of file
3255 (indicated by '.'), or might have encountered an error while writing the
3256 message id or "next" line. */
3258 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3262 message_ended = chunking_state <= CHUNKING_OFFERED
3263 ? read_message_data_smtp(spool_data_file, first_line_ended_crlf)
3265 ? read_message_bdat_smtp_wire(spool_data_file)
3266 : read_message_bdat_smtp(spool_data_file);
3267 receive_linecount++; /* The terminating "." line */
3270 message_ended = read_message_data(spool_data_file);
3272 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3273 message_linecount += body_linecount;
3275 switch (message_ended)
3277 /* Handle premature termination of SMTP */
3282 Uunlink(spool_name); /* Lose data file when closed */
3283 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3284 smtp_reply = handle_lost_connection(US"");
3286 goto NOT_ACCEPTED; /* Skip to end of function */
3290 /* Handle message that is too big. Don't use host_or_ident() in the log
3291 message; we want to see the ident value even for non-remote messages. */
3294 Uunlink(spool_name); /* Lose the data file when closed */
3295 cancel_cutthrough_connection(TRUE, US"mail too big");
3296 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3298 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3299 "message too big: read=%d max=%d",
3301 sender_fullhost ? " H=" : "",
3302 sender_fullhost ? sender_fullhost : US"",
3303 sender_ident ? " U=" : "",
3304 sender_ident ? sender_ident : US"",
3306 thismessage_size_limit);
3310 smtp_reply = US"552 Message size exceeds maximum permitted";
3311 goto NOT_ACCEPTED; /* Skip to end of function */
3315 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3316 give_local_error(ERRMESS_TOOBIG,
3317 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3318 US"message rejected: ", error_rc, spool_data_file, header_list);
3319 /* Does not return */
3323 /* Handle bad BDAT protocol sequence */
3326 Uunlink(spool_name); /* Lose the data file when closed */
3327 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3328 smtp_reply = US""; /* Response already sent */
3329 goto NOT_ACCEPTED; /* Skip to end of function */
3333 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3334 example, there may be some expansion in an ACL that uses a timer.) */
3336 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3338 /* The message body has now been read into the data file. Call fflush() to
3339 empty the buffers in C, and then call fsync() to get the data written out onto
3340 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3341 having to do this). If there was an I/O error on either input or output,
3342 attempt to send an error message, and unlink the spool file. For non-SMTP input
3343 we can then give up. Note that for SMTP input we must swallow the remainder of
3344 the input in cases of output errors, since the far end doesn't expect to see
3345 anything until the terminating dot line is sent. */
3347 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3348 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3350 uschar *msg_errno = US strerror(errno);
3351 BOOL input_error = (receive_ferror)() != 0;
3352 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3353 input_error? "Input read" : "Spool write",
3355 sender_fullhost ? sender_fullhost : sender_ident);
3357 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3358 Uunlink(spool_name); /* Lose the data file */
3359 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3364 smtp_reply = US"451 Error while reading input data";
3367 smtp_reply = US"451 Error while writing spool file";
3368 receive_swallow_smtp();
3370 goto NOT_ACCEPTED; /* Skip to end of function */
3375 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3376 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3378 /* Does not return */
3383 /* No I/O errors were encountered while writing the data file. */
3385 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3386 gettimeofday(&received_time_complete, NULL);
3389 /* If there were any bad addresses extracted by -t, or there were no recipients
3390 left after -t, send a message to the sender of this message, or write it to
3391 stderr if the error handling option is set that way. Note that there may
3392 legitimately be no recipients for an SMTP message if they have all been removed
3395 We need to rewind the data file in order to read it. In the case of no
3396 recipients or stderr error writing, throw the data file away afterwards, and
3397 exit. (This can't be SMTP, which always ensures there's at least one
3398 syntactically good recipient address.) */
3400 if (extract_recip && (bad_addresses || recipients_count == 0))
3404 if (recipients_count == 0) debug_printf("*** No recipients\n");
3407 debug_printf("*** Bad address(es)\n");
3408 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3409 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3413 log_write(0, LOG_MAIN|LOG_PANIC, "%s found in headers",
3414 bad_addresses ? "bad addresses" : "no recipients");
3416 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3418 /* If configured to send errors to the sender, but this fails, force
3419 a failure error code. We use a special one for no recipients so that it
3420 can be detected by the autoreply transport. Otherwise error_rc is set to
3421 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3422 it is EXIT_SUCCESS. */
3424 if (error_handling == ERRORS_SENDER)
3426 if (!moan_to_sender(
3428 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3429 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3430 bad_addresses, header_list, spool_data_file, FALSE
3432 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3437 if (extracted_ignored)
3438 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3440 fprintf(stderr, "exim: no recipients in message\n");
3443 fprintf(stderr, "exim: invalid address%s",
3444 bad_addresses->next ? "es:\n" : ":");
3445 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3446 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3447 bad_addresses->text2);
3451 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3453 Uunlink(spool_name);
3454 (void)fclose(spool_data_file);
3455 exim_exit(error_rc);
3459 /* Data file successfully written. Generate text for the Received: header by
3460 expanding the configured string, and adding a timestamp. By leaving this
3461 operation till now, we ensure that the timestamp is the time that message
3462 reception was completed. However, this is deliberately done before calling the
3463 data ACL and local_scan().
3465 This Received: header may therefore be inspected by the data ACL and by code in
3466 the local_scan() function. When they have run, we update the timestamp to be
3467 the final time of reception.
3469 If there is just one recipient, set up its value in the $received_for variable
3470 for use when we generate the Received: header.
3472 Note: the checking for too many Received: headers is handled by the delivery
3474 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3476 if (!received_header->text) /* Non-cutthrough case */
3478 received_header_gen();
3480 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3482 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3483 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3485 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3486 now, before running the DATA ACL. */
3488 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3491 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3492 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3494 /* If an ACL is specified for checking things at this stage of reception of a
3495 message, run it, unless all the recipients were removed by "discard" in earlier
3496 ACLs. That is the only case in which recipients_count can be zero at this
3497 stage. Set deliver_datafile to point to the data file so that $message_body and
3498 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3501 deliver_datafile = data_fd;
3504 f.enable_dollar_recipients = TRUE;
3506 if (recipients_count == 0)
3507 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3511 /* Handle interactive SMTP messages */
3513 if (smtp_input && !smtp_batched_input)
3516 #ifndef DISABLE_DKIM
3517 if (!f.dkim_disable_verify)
3519 /* Finish verification */
3520 dkim_exim_verify_finish();
3522 /* Check if we must run the DKIM ACL */
3523 GET_OPTION("acl_smtp_dkim");
3524 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3526 uschar * dkim_verify_signers_expanded =
3527 expand_string(dkim_verify_signers);
3528 gstring * results = NULL;
3532 gstring * seen_items = NULL;
3533 int old_pool = store_pool;
3535 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3537 if (!(ptr = dkim_verify_signers_expanded))
3538 log_write(0, LOG_MAIN|LOG_PANIC,
3539 "expansion of dkim_verify_signers option failed: %s",
3540 expand_string_message);
3542 /* Default to OK when no items are present */
3544 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3546 /* Prevent running ACL for an empty item */
3547 if (!item || !*item) continue;
3549 /* Only run ACL once for each domain or identity,
3550 no matter how often it appears in the expanded list. */
3554 const uschar * seen_items_list = string_from_gstring(seen_items);
3556 BOOL seen_this_item = FALSE;
3558 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3560 if (Ustrcmp(seen_item,item) == 0)
3562 seen_this_item = TRUE;
3569 debug_printf("acl_smtp_dkim: skipping signer %s, "
3570 "already seen\n", item);
3574 seen_items = string_catn(seen_items, US":", 1);
3576 seen_items = string_cat(seen_items, item);
3578 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3582 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3583 "skipping remaining items\n", rc, item);
3584 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3588 dkim_verify_status = string_from_gstring(results);
3589 store_pool = old_pool;
3590 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3593 recipients_count = 0;
3594 blackholed_by = US"DKIM ACL";
3596 blackhole_log_msg = string_sprintf(": %s", log_msg);
3600 Uunlink(spool_name);
3601 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3602 smtp_yield = FALSE; /* No more messages after dropped connection */
3603 smtp_reply = US""; /* Indicate reply already sent */
3604 goto NOT_ACCEPTED; /* Skip to end of function */
3608 dkim_exim_verify_log_all();
3610 #endif /* DISABLE_DKIM */
3612 #ifdef WITH_CONTENT_SCAN
3613 if (recipients_count > 0)
3615 GET_OPTION("acl_smtp_mime");
3617 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3621 #endif /* WITH_CONTENT_SCAN */
3623 #ifdef SUPPORT_DMARC
3624 dmarc_store_data(from_header);
3627 #ifndef DISABLE_PRDR
3628 if (prdr_requested && recipients_count > 1)
3630 GET_OPTION("acl_smtp_data_prdr");
3631 if (acl_smtp_data_prdr)
3634 int all_fail = FAIL;
3636 smtp_printf("353 PRDR content analysis beginning\r\n", SP_MORE);
3637 /* Loop through recipients, responses must be in same order received */
3638 for (unsigned int c = 0; recipients_count > c; c++)
3640 const uschar * addr = recipients_list[c].address;
3641 uschar * msg= US"PRDR R=<%s> %s";
3644 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3645 addr, c+1, recipients_count);
3646 rc = acl_check(ACL_WHERE_PRDR, addr,
3647 acl_smtp_data_prdr, &user_msg, &log_msg);
3649 /* If any recipient rejected content, indicate it in final message */
3651 /* If all recipients rejected, indicate in final message */
3656 case OK: case DISCARD: code = US"250"; break;
3657 case DEFER: code = US"450"; break;
3658 default: code = US"550"; break;
3660 if (user_msg != NULL)
3661 smtp_user_msg(code, user_msg);
3666 case OK: case DISCARD:
3667 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3669 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3671 msg = string_sprintf(CS msg, addr, "refusal"); break;
3673 smtp_user_msg(code, msg);
3675 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3676 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3677 else log_write(0, LOG_MAIN, "%s", CS msg);
3679 if (rc != OK) { receive_remove_recipient(addr); c--; }
3681 /* Set up final message, used if data acl gives OK */
3682 smtp_reply = string_sprintf("%s id=%s message %s",
3683 all_fail == FAIL ? US"550" : US"250",
3686 ? US"rejected for all recipients"
3689 : US"accepted for some recipients");
3690 if (recipients_count == 0)
3694 prdr_requested = FALSE;
3697 prdr_requested = FALSE;
3698 #endif /* !DISABLE_PRDR */
3700 /* Check the recipients count again, as the MIME ACL might have changed
3703 GET_OPTION("acl_smtp_data");
3704 if (acl_smtp_data && recipients_count > 0)
3706 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3707 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3710 recipients_count = 0;
3711 blackholed_by = US"DATA ACL";
3713 blackhole_log_msg = string_sprintf(": %s", log_msg);
3714 cancel_cutthrough_connection(TRUE, US"data acl discard");
3718 Uunlink(spool_name);
3719 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3720 #ifdef WITH_CONTENT_SCAN
3723 #ifdef EXPERIMENTAL_DCC
3726 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3727 smtp_yield = FALSE; /* No more messages after dropped connection */
3728 smtp_reply = US""; /* Indicate reply already sent */
3729 goto NOT_ACCEPTED; /* Skip to end of function */
3734 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3735 we cannot take different actions for permanent and temporary rejections. */
3740 #ifdef WITH_CONTENT_SCAN
3741 GET_OPTION("acl_not_smtp_mime");
3742 if ( acl_not_smtp_mime
3743 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3747 #endif /* WITH_CONTENT_SCAN */
3749 GET_OPTION("acl_not_smtp");
3752 uschar * user_msg, * log_msg;
3753 f.authentication_local = TRUE;
3754 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3757 recipients_count = 0;
3758 blackholed_by = US"non-SMTP ACL";
3760 blackhole_log_msg = string_sprintf(": %s", log_msg);
3764 Uunlink(spool_name);
3765 #ifdef WITH_CONTENT_SCAN
3768 #ifdef EXPERIMENTAL_DCC
3771 /* The ACL can specify where rejections are to be logged, possibly
3772 nowhere. The default is main and reject logs. */
3774 if (log_reject_target)
3775 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3776 sender_address, log_msg);
3778 if (!user_msg) user_msg = US"local configuration problem";
3779 if (smtp_batched_input)
3780 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3781 /* Does not return */
3784 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3785 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3786 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3788 /* Does not return */
3791 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3795 /* The applicable ACLs have been run */
3797 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3798 if (f.queue_only_policy) queued_by = US"ACL";
3801 #ifdef WITH_CONTENT_SCAN
3805 #ifdef EXPERIMENTAL_DCC
3810 #ifdef HAVE_LOCAL_SCAN
3811 /* The final check on the message is to run the scan_local() function. The
3812 version supplied with Exim always accepts, but this is a hook for sysadmins to
3813 supply their own checking code. The local_scan() function is run even when all
3814 the recipients have been discarded. */
3816 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
3818 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3819 deleted, and the incident gets logged. */
3821 if (sigsetjmp(local_scan_env, 1) == 0)
3823 had_local_scan_crash = 0;
3824 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3825 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3826 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3827 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3829 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3830 local_scan_timeout);
3831 local_scan_data = NULL;
3833 had_local_scan_timeout = 0;
3834 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3835 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3836 rc = local_scan(data_fd, &local_scan_data);
3838 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3840 f.enable_dollar_recipients = FALSE;
3842 store_pool = POOL_MAIN; /* In case changed */
3843 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3846 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3847 os_non_restarting_signal(SIGFPE, SIG_DFL);
3848 os_non_restarting_signal(SIGILL, SIG_DFL);
3849 os_non_restarting_signal(SIGBUS, SIG_DFL);
3853 if (had_local_scan_crash)
3855 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3856 "signal %d - message temporarily rejected (size %d)",
3857 had_local_scan_crash, message_size);
3858 receive_bomb_out(US"local-scan-error", US"local verification problem");
3859 /* Does not return */
3861 if (had_local_scan_timeout)
3863 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3864 "message temporarily rejected (size %d)", message_size);
3865 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3866 /* Does not return */
3870 /* The length check is paranoia against some runaway code, and also because
3871 (for a success return) lines in the spool file are read into big_buffer. */
3873 if (local_scan_data)
3875 int len = Ustrlen(local_scan_data);
3876 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3877 local_scan_data = string_copyn(local_scan_data, len);
3880 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3882 if (!f.deliver_freeze) /* ACL might have already frozen */
3884 f.deliver_freeze = TRUE;
3885 deliver_frozen_at = time(NULL);
3886 frozen_by = US"local_scan()";
3888 rc = LOCAL_SCAN_ACCEPT;
3890 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3892 if (!f.queue_only_policy) /* ACL might have already queued */
3894 f.queue_only_policy = TRUE;
3895 queued_by = US"local_scan()";
3897 rc = LOCAL_SCAN_ACCEPT;
3900 /* Message accepted: remove newlines in local_scan_data because otherwise
3901 the spool file gets corrupted. Ensure that all recipients are qualified. */
3903 if (rc == LOCAL_SCAN_ACCEPT)
3905 if (local_scan_data)
3906 for (uschar * s = local_scan_data; *s; s++) if (*s == '\n') *s = ' ';
3907 for (recipient_item * r = recipients_list;
3908 r < recipients_list + recipients_count; r++)
3910 r->address = rewrite_address_qualify(r->address, TRUE);
3912 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3914 if (recipients_count == 0 && !blackholed_by)
3915 blackholed_by = US"local_scan";
3918 /* Message rejected: newlines permitted in local_scan_data to generate
3919 multiline SMTP responses. */
3923 uschar *istemp = US"";
3927 errmsg = local_scan_data;
3929 Uunlink(spool_name); /* Cancel this message */
3933 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3934 "rejection given", rc);
3937 case LOCAL_SCAN_REJECT_NOLOGHDR:
3938 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3941 case LOCAL_SCAN_REJECT:
3942 smtp_code = US"550";
3943 if (!errmsg) errmsg = US"Administrative prohibition";
3946 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3947 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3950 case LOCAL_SCAN_TEMPREJECT:
3952 smtp_code = US"451";
3953 if (!errmsg) errmsg = US"Temporary local problem";
3954 istemp = US"temporarily ";
3958 g = string_append(NULL, 2, US"F=", *sender_address ? sender_address : US"<>");
3959 g = add_host_info_for_log(g);
3961 log_write(0, LOG_MAIN|LOG_REJECT, "%Y %srejected by local_scan(): %.256s",
3962 g, istemp, string_printing(errmsg));
3965 if (!smtp_batched_input)
3967 smtp_respond(smtp_code, 3, SR_FINAL, errmsg);
3968 smtp_reply = US""; /* Indicate reply already sent */
3969 goto NOT_ACCEPTED; /* Skip to end of function */
3972 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3973 /* Does not return */
3976 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3977 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3978 US"message rejected by local scan code: ", error_rc, spool_data_file,
3980 /* Does not return */
3984 /* Reset signal handlers to ignore signals that previously would have caused
3985 the message to be abandoned. */
3987 signal(SIGTERM, SIG_IGN);
3988 signal(SIGINT, SIG_IGN);
3989 #endif /* HAVE_LOCAL_SCAN */
3991 /* If we are faking a reject or defer, avoid sennding a DSN for the
3992 actually-accepted message */
3994 if (fake_response != OK)
3995 for (recipient_item * r = recipients_list;
3996 r < recipients_list + recipients_count; r++)
3998 DEBUG(D_receive) if (r->dsn_flags & (rf_notify_success | rf_notify_delay))
3999 debug_printf("DSN: clearing flags due to fake-response for message\n");
4000 r->dsn_flags = r->dsn_flags & ~(rf_notify_success | rf_notify_delay)
4005 /* Ensure the first time flag is set in the newly-received message. */
4007 f.deliver_firsttime = TRUE;
4009 #ifdef EXPERIMENTAL_BRIGHTMAIL
4011 { /* rewind data file */
4012 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
4013 bmi_verdicts = bmi_process_message(header_list, data_fd);
4017 /* Update the timestamp in our Received: header to account for any time taken by
4018 an ACL or by local_scan(). The new time is the time that all reception
4019 processing is complete. */
4021 timestamp = expand_string(US"${tod_full}");
4022 tslen = Ustrlen(timestamp);
4024 memcpy(received_header->text + received_header->slen - tslen - 1,
4027 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
4031 f.deliver_freeze = FALSE;
4032 f.queue_only_policy = FALSE;
4035 /* Keep the data file open until we have written the header file, in order to
4036 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
4037 don't write the header file, and we unlink the data file. If writing the header
4038 file fails, we have failed to accept this message. */
4040 if (host_checking || blackholed_by)
4042 Uunlink(spool_name);
4043 msg_size = 0; /* Compute size for log line */
4044 for (header_line * h = header_list; h; h = h->next)
4045 if (h->type != '*') msg_size += h->slen;
4048 /* Write the -H file */
4051 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
4053 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
4054 Uunlink(spool_name); /* Lose the data file */
4058 smtp_reply = US"451 Error in writing spool file";
4063 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4064 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4066 /* Does not return */
4071 /* The message has now been successfully received. */
4073 receive_messagecount++;
4075 if ( fflush(spool_data_file)
4076 #if _POSIX_C_SOURCE >= 199309L || _XOPEN_SOURCE >= 500
4077 # ifdef ENABLE_DISABLE_FSYNC
4078 || !disable_fsync && fdatasync(data_fd)
4080 || fdatasync(data_fd)
4085 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
4086 log_write(0, LOG_MAIN, "%s\n", errmsg);
4087 Uunlink(spool_name); /* Lose the data file */
4091 smtp_reply = US"451 Error in writing spool file";
4096 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4097 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4099 /* Does not return */
4103 /* Add data size to written header size. We do not count the initial file name
4104 that is in the file, but we do add one extra for the notional blank line that
4105 precedes the data. This total differs from message_size in that it include the
4106 added Received: header and any other headers that got created locally. */
4108 fstat(data_fd, &statbuf);
4109 msg_size += statbuf.st_size - spool_data_start_offset(message_id) + 1;
4111 /* Generate a "message received" log entry. We do this by building up a dynamic
4112 string as required. We log the arrival of a new message while the
4113 file is still locked, just in case the machine is *really* fast, and delivers
4114 it first! Include any message id that is in the message - since the syntax of a
4115 message id is actually an addr-spec, we can use the parse routine to canonicalize
4118 rcvd_log_reset_point = store_mark();
4119 g = string_get(256);
4121 g = string_append(g, 2,
4122 fake_response == FAIL ? US"(= " : US"<= ",
4123 *sender_address ? sender_address : US"<>");
4124 if (message_reference)
4125 g = string_append(g, 2, US" R=", message_reference);
4127 g = add_host_info_for_log(g);
4130 if (LOGGING(tls_cipher) && tls_in.cipher)
4132 g = string_append(g, 2, US" X=", tls_in.cipher);
4133 # ifndef DISABLE_TLS_RESUME
4134 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4135 g = string_catn(g, US"*", 1);
4138 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4139 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4140 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4141 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4142 if (LOGGING(tls_sni) && tls_in.sni)
4143 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4146 if (sender_host_authenticated)
4148 g = string_append(g, 2, US" A=", sender_host_authenticated);
4149 if (authenticated_id)
4151 g = string_append(g, 2, US":", authenticated_id);
4152 if (LOGGING(smtp_mailauth) && authenticated_sender)
4153 g = string_append(g, 2, US":", authenticated_sender);
4157 #ifndef DISABLE_PRDR
4159 g = string_catn(g, US" PRDR", 5);
4162 #ifdef SUPPORT_PROXY
4163 if (proxy_session && LOGGING(proxy))
4164 g = string_append(g, 2, US" PRX=", proxy_local_address);
4167 if (chunking_state > CHUNKING_OFFERED)
4168 g = string_catn(g, US" K", 2);
4170 g = string_fmt_append(g, " S=%d", msg_size);
4172 /* log 8BITMIME mode announced in MAIL_FROM
4176 if (LOGGING(8bitmime))
4177 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4179 #ifndef DISABLE_DKIM
4180 if (LOGGING(dkim) && dkim_verify_overall)
4181 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4182 # ifdef EXPERIMENTAL_ARC
4183 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4184 g = string_catn(g, US" ARC", 4);
4188 if (LOGGING(receive_time))
4190 struct timeval diff = received_time_complete;
4191 timediff(&diff, &received_time);
4192 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4196 g = string_append(g, 2, US" Q=", queue_name);
4198 /* If an addr-spec in a message-id contains a quoted string, it can contain
4199 any characters except " \ and CR and so in particular it can contain NL!
4200 Therefore, make sure we use a printing-characters only version for the log.
4201 Also, allow for domain literals in the message id. */
4203 if ( LOGGING(msg_id) && msgid_header
4204 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4208 BOOL save_allow_domain_literals = allow_domain_literals;
4209 allow_domain_literals = TRUE;
4210 int start, end, domain;
4212 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4213 &errmsg, &start, &end, &domain, FALSE);
4214 allow_domain_literals = save_allow_domain_literals;
4216 g = string_append(g, 2,
4217 msgid_header_newly_created ? US" id*=" : US" id=",
4218 string_printing(old_id));
4221 /* If subject logging is turned on, create suitable printing-character
4222 text. By expanding $h_subject: we make use of the MIME decoding. */
4224 if (LOGGING(subject) && subject_header)
4226 uschar *p = big_buffer;
4227 uschar *ss = expand_string(US"$h_subject:");
4229 /* Backslash-quote any double quotes or backslashes so as to make a
4230 a C-like string, and turn any non-printers into escape sequences. */
4233 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4235 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4240 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4243 /* Terminate the string: string_cat() and string_append() leave room, but do
4244 not put the zero in. */
4246 (void) string_from_gstring(g);
4248 /* Create a message log file if message logs are being used and this message is
4249 not blackholed. Write the reception stuff to it. We used to leave message log
4250 creation until the first delivery, but this has proved confusing for some
4253 if (message_logs && !blackholed_by)
4256 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4258 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4262 (void)directory_make(spool_directory,
4263 spool_sname(US"msglog", message_subdir),
4264 MSGLOG_DIRECTORY_MODE, TRUE);
4265 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4269 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4270 m_name, strerror(errno));
4273 FILE *message_log = fdopen(fd, "a");
4276 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4277 m_name, strerror(errno));
4282 uschar * now = tod_stamp(tod_log);
4283 /* Drop the initial "<= " */
4284 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4285 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4287 if (f.queue_only_policy) fprintf(message_log,
4288 "%s no immediate delivery: queued%s%s by %s\n", now,
4289 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4291 (void)fclose(message_log);
4296 /* Everything has now been done for a successful message except logging its
4297 arrival, and outputting an SMTP response. While writing to the log, set a flag
4298 to cause a call to receive_bomb_out() if the log cannot be opened. */
4300 f.receive_call_bombout = TRUE;
4302 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4303 connection has gone away. This can only be done if there is no unconsumed input
4304 waiting in the local input buffer. We can test for this by calling
4305 receive_hasc(). RFC 2920 (pipelining) explicitly allows for additional
4306 input to be sent following the final dot, so the presence of following input is
4309 If the connection is still present, but there is no unread input for the
4310 socket, the result of a select() call will be zero. If, however, the connection
4311 has gone away, or if there is pending input, the result of select() will be
4312 non-zero. The two cases can be distinguished by trying to read the next input
4313 character. If we succeed, we can unread it so that it remains in the local
4314 buffer for handling later. If not, the connection has been lost.
4316 Of course, since TCP/IP is asynchronous, there is always a chance that the
4317 connection will vanish between the time of this test and the sending of the
4318 response, but the chance of this happening should be small. */
4320 if ( smtp_input && sender_host_address && !f.sender_host_notsocket
4323 if (poll_one_fd(fileno(smtp_in), POLLIN, 0) != 0)
4325 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4326 if (c != EOF) (receive_ungetc)(c);
4329 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4330 smtp_reply = US""; /* No attempt to send a response */
4331 smtp_yield = FALSE; /* Nothing more on this connection */
4333 /* Re-use the log line workspace */
4336 g = string_cat(g, US"SMTP connection lost after final dot");
4337 g = add_host_info_for_log(g);
4338 log_write(0, LOG_MAIN, "%Y", g);
4340 /* Delete the files for this aborted message. */
4342 Uunlink(spool_name);
4343 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4344 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4351 /* The connection has not gone away; we really are going to take responsibility
4352 for this message. */
4354 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4357 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4358 the sender's dot (below).
4359 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4360 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4361 in which case pass temp-reject back to initiator and dump the files.
4363 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4365 XXX We do not handle queue-only, freezing, or blackholes.
4367 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4369 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4370 /* Logging was done in finaldot() */
4373 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4374 cutthrough_done = ACCEPTED;
4375 break; /* message_id needed for SMTP accept below */
4377 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4378 ... for which, pass back the exact error */
4379 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4380 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4381 break; /* message_id needed for SMTP accept below */
4383 default: /* Unknown response, or error. Treat as temp-reject. */
4384 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4385 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4386 break; /* message_id needed for SMTP accept below */
4388 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4389 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4390 cutthrough_done = PERM_REJ;
4395 #ifndef DISABLE_PRDR
4396 if(!smtp_reply || prdr_requested)
4401 log_write(0, LOG_MAIN |
4402 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4403 (LOGGING(received_sender) ? LOG_SENDER : 0),
4406 /* Log any control actions taken by an ACL or local_scan(). */
4408 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4409 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4410 "no immediate delivery: queued%s%s by %s",
4411 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4414 f.receive_call_bombout = FALSE;
4416 /* The store for the main log message can be reused */
4417 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4419 /* If the message is frozen, and freeze_tell is set, do the telling. */
4421 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4422 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4423 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4424 message_id, frozen_by, sender_address);
4427 /* Either a message has been successfully received and written to the two spool
4428 files, or an error in writing the spool has occurred for an SMTP message, or
4429 an SMTP message has been rejected for policy reasons, or a message was passed on
4430 by cutthrough delivery. (For a non-SMTP message we will have already given up
4431 because there's no point in carrying on!) For non-cutthrough we must now close
4432 (and thereby unlock) the data file. In the successful case, this leaves the
4433 message on the spool, ready for delivery. In the error case, the spool file will
4434 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4437 For cutthrough we hold the data file locked until we have deleted it, otherwise
4438 a queue-runner could grab it in the window.
4440 A fflush() was done earlier in the expectation that any write errors on the
4441 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4442 possible for fclose() to fail - and this has been seen on obscure filesystems
4443 (probably one that delayed the actual media write as long as possible)
4444 but what to do? What has happened to the lock if this happens?
4445 It's a mess because we already logged the acceptance.
4446 We can at least log the issue, try to remove spoolfiles and respond with
4447 a temp-reject. We do not want to close before logging acceptance because
4448 we want to hold the lock until we know that logging worked.
4449 Could we make this less likely by doing an fdatasync() just after the fflush()?
4450 That seems like a good thing on data-security grounds, but how much will it hit
4457 message_id[0] = 0; /* Indicate no message accepted */
4460 process_info[process_info_len] = 0; /* Remove message id */
4461 if (spool_data_file && cutthrough_done == NOT_TRIED)
4463 if (fclose(spool_data_file)) /* Frees the lock */
4465 log_msg = string_sprintf("spoolfile error on close: %s", strerror(errno));
4466 log_write(0, LOG_MAIN|LOG_PANIC |
4467 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4468 (LOGGING(received_sender) ? LOG_SENDER : 0),
4470 log_write(0, LOG_MAIN |
4471 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4472 (LOGGING(received_sender) ? LOG_SENDER : 0),
4473 "rescind the above message-accept");
4475 Uunlink(spool_name);
4476 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4477 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4479 /* Claim a data ACL temp-reject, just to get reject logging and response */
4480 if (smtp_input) smtp_handle_acl_fail(ACL_WHERE_DATA, rc, NULL, log_msg);
4481 smtp_reply = US""; /* Indicate reply already sent */
4483 message_id[0] = 0; /* no message accepted */
4485 spool_data_file = NULL;
4488 /* Now reset signal handlers to their defaults */
4490 signal(SIGTERM, SIG_DFL);
4491 signal(SIGINT, SIG_DFL);
4493 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4494 value, which defaults TRUE - meaning there may be more incoming messages from
4495 this connection. For non-SMTP callers (where there is only ever one message),
4496 the default is FALSE. */
4502 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4503 is set to the response that should be sent. When it is NULL, we generate
4504 default responses. After an ACL error or local_scan() error, the response has
4505 already been sent, and smtp_reply is an empty string to indicate this. */
4507 if (!smtp_batched_input)
4511 if (fake_response != OK)
4512 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4513 3, SR_FINAL, fake_response_text);
4515 /* An OK response is required; use "message" text if present. */
4519 uschar *code = US"250";
4521 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4522 smtp_respond(code, len, SR_FINAL, user_msg);
4525 /* Default OK response */
4527 else if (chunking_state > CHUNKING_OFFERED)
4529 /* If there is more input waiting, no need to flush (probably the client
4530 pipelined QUIT after data). We check only the in-process buffer, not
4533 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4535 chunking_datasize, message_size+message_linecount, message_id);
4536 chunking_state = CHUNKING_OFFERED;
4539 smtp_printf("250 OK id=%s\r\n", receive_hasc(), message_id);
4543 "\n**** SMTP testing: that is not a real message id!\n\n");
4546 /* smtp_reply is set non-empty */
4548 else if (smtp_reply[0] != 0)
4549 if (fake_response != OK && smtp_reply[0] == '2')
4550 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4551 3, SR_FINAL, fake_response_text);
4553 smtp_printf("%.1024s\r\n", SP_NO_MORE, smtp_reply);
4555 switch (cutthrough_done)
4558 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4560 /* Delete spool files */
4561 Uunlink(spool_name);
4562 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4563 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4567 if (cutthrough.defer_pass)
4569 Uunlink(spool_name);
4570 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4571 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4576 if (cutthrough_done != NOT_TRIED)
4578 if (spool_data_file)
4580 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4581 spool_data_file = NULL;
4583 message_id[0] = 0; /* Prevent a delivery from starting */
4584 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4585 cutthrough.defer_pass = FALSE;
4589 /* For batched SMTP, generate an error message on failure, and do
4590 nothing on success. The function moan_smtp_batch() does not return -
4591 it exits from the program with a non-zero return code. */
4593 else if (smtp_reply)
4594 moan_smtp_batch(NULL, "%s", smtp_reply);
4598 /* If blackholing, we can immediately log this message's sad fate. The data
4599 file has already been unlinked, and the header file was never written to disk.
4600 We must now indicate that nothing was received, to prevent a delivery from
4605 const uschar *detail =
4606 #ifdef HAVE_LOCAL_SCAN
4607 local_scan_data ? string_printing(local_scan_data) :
4609 string_sprintf("(%s discarded recipients)", blackholed_by);
4610 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4611 log_write(0, LOG_MAIN, "Completed");
4615 /* Reset headers so that logging of rejects for a subsequent message doesn't
4616 include them. It is also important to set header_last = NULL before exiting
4617 from this function, as this prevents certain rewrites that might happen during
4618 subsequent verifying (of another incoming message) from trying to add headers
4619 when they shouldn't. */
4621 header_list = header_last = NULL;
4623 return yield; /* TRUE if more messages (SMTP only) */
4626 /* End of receive.c */