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 #ifdef SUPPORT_DMARC
1761 header_line * dmarc_from_header = NULL;
1763 header_line * subject_header = NULL, * msgid_header = NULL, * received_header;
1764 BOOL msgid_header_newly_created = FALSE;
1766 /* Variables for use when building the Received: header. */
1771 /* Time of creation of message_id */
1773 static struct timeval message_id_tv = { 0, 0 };
1776 /* Release any open files that might have been cached while preparing to
1777 accept the message - e.g. by verifying addresses - because reading a message
1778 might take a fair bit of real time. */
1782 /* Extracting the recipient list from an input file is incompatible with
1783 cutthrough delivery with the no-spool option. It shouldn't be possible
1784 to set up the combination, but just in case kill any ongoing connection. */
1785 if (extract_recip || !smtp_input)
1786 cancel_cutthrough_connection(TRUE, US"not smtp input");
1788 /* Initialize the chain of headers by setting up a place-holder for Received:
1789 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1790 pointing to the end of the chain to make adding headers simple. */
1792 received_header = header_list = header_last = store_get(sizeof(header_line), GET_UNTAINTED);
1793 header_list->next = NULL;
1794 header_list->type = htype_old;
1795 header_list->text = NULL;
1796 header_list->slen = 0;
1798 /* Control block for the next header to be read.
1799 The data comes from the message, so is tainted. */
1801 reset_point = store_mark();
1802 next = store_get(sizeof(header_line), GET_UNTAINTED);
1803 next->text = store_get(header_size, GET_TAINTED);
1805 /* Initialize message id to be null (indicating no message read), and the
1806 header names list to be the normal list. Indicate there is no data file open
1807 yet, initialize the size and warning count, and deal with no size limit. */
1810 spool_data_file = NULL;
1815 received_count = 1; /* For the one we will add */
1817 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1819 /* While reading the message, the following counts are computed. */
1821 message_linecount = body_linecount = body_zerocount =
1822 max_received_linelength = 0;
1824 #ifdef WITH_CONTENT_SCAN
1825 /* reset non-per-part mime variables */
1826 mime_is_coverletter = 0;
1828 mime_part_count = -1;
1831 #ifndef DISABLE_DKIM
1832 /* Call into DKIM to set up the context. In CHUNKING mode
1833 we clear the dot-stuffing flag */
1834 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1835 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1838 #ifdef SUPPORT_DMARC
1839 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1842 /* In SMTP sessions we may receive several messages in one connection. Before
1843 each subsequent one, we wait for the clock to tick at the level of message-id
1845 This is so that the combination of time+pid is unique, even on systems where the
1846 pid can be re-used within our time interval. We can't shorten the interval
1847 without re-designing the message-id. See comments above where the message id is
1848 created. This is Something For The Future.
1849 Do this wait any time we have previously created a message-id, even if we
1850 rejected the message. This gives unique IDs for logging done by ACLs.
1851 The initial timestamp must have been obtained via exim_gettime() to avoid
1852 issues on Linux with suspend/resume. */
1854 if (message_id_tv.tv_sec)
1856 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
1857 exim_wait_tick(&message_id_tv, id_resolution);
1860 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1861 ids, and fractions of a second are required. See the comments that precede the
1862 message id creation below.
1863 We use a routine that if possible uses a monotonic clock, and can be used again
1864 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1867 exim_gettime(&message_id_tv);
1869 /* For other uses of the received time we can operate with granularity of one
1870 second, and for that we use the global variable received_time. This is for
1871 things like ultimate message timeouts.
1872 For this we do not care about the Linux suspend/resume problem, so rather than
1873 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1875 gettimeofday(&received_time, NULL);
1877 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1878 happen in the smtp_getc() function when it refills its buffer. */
1880 had_data_timeout = 0;
1882 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1884 /* If not SMTP input, timeout happens only if configured, and we just set a
1885 single timeout for the whole message. */
1887 else if (receive_timeout > 0)
1889 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1890 ALARM(receive_timeout);
1893 /* SIGTERM and SIGINT are caught always. */
1895 had_data_sigint = 0;
1896 signal(SIGTERM, data_sigterm_sigint_handler);
1897 signal(SIGINT, data_sigterm_sigint_handler);
1899 /* Header lines in messages are not supposed to be very long, though when
1900 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1901 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1902 storing the header, and extend this as necessary using string_cat().
1904 To cope with total lunacies, impose an upper limit on the length of the header
1905 section of the message, as otherwise the store will fill up. We must also cope
1906 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1907 Folded header lines are joined into one string, leaving the '\n' characters
1908 inside them, so that writing them out reproduces the input.
1910 Loop for each character of each header; the next structure for chaining the
1911 header is set up already, with ptr the offset of the next character in
1916 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1918 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1919 SMTP must have a correct "." terminator. */
1921 if (smtp_input /* && !smtp_batched_input */)
1924 smtp_reply = handle_lost_connection(US" (header)");
1926 goto TIDYUP; /* Skip to end of function */
1931 /* See if we are at the current header's size limit - there must be at least
1932 four bytes left. This allows for the new character plus a zero, plus two for
1933 extra insertions when we are playing games with dots and carriage returns. If
1934 we are at the limit, extend the text buffer. This could have been done
1935 automatically using string_cat() but because this is a tightish loop storing
1936 only one character at a time, we choose to do it inline. Normally
1937 store_extend() will be able to extend the block; only at the end of a big
1938 store block will a copy be needed. To handle the case of very long headers
1939 (and sometimes lunatic messages can have ones that are 100s of K long) we
1940 call store_release() for strings that have been copied - if the string is at
1941 the start of a block (and therefore the only thing in it, because we aren't
1942 doing any other gets), the block gets freed. We can only do this release if
1943 there were no allocations since the once that we want to free. */
1945 if (ptr >= header_size - 4)
1947 int oldsize = header_size;
1949 if (header_size >= INT_MAX/2)
1953 if (!store_extend(next->text, oldsize, header_size))
1954 next->text = store_newblock(next->text, header_size, ptr);
1957 /* Cope with receiving a binary zero. There is dispute about whether
1958 these should be allowed in RFC 822 messages. The middle view is that they
1959 should not be allowed in headers, at least. Exim takes this attitude at
1960 the moment. We can't just stomp on them here, because we don't know that
1961 this line is a header yet. Set a flag to cause scanning later. */
1963 if (ch == 0) had_zero++;
1965 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1966 those from data files use just LF. Treat LF in local SMTP input as a
1967 terminator too. Treat EOF as a line terminator always. */
1969 if (ch < 0) goto EOL;
1971 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1972 other MTAs accept this. We are therefore forced into this "liberalisation"
1973 too, so we accept LF as a line terminator whatever the source of the message.
1974 However, if the first line of the message ended with a CRLF, we treat a bare
1975 LF specially by inserting a white space after it to ensure that the header
1976 line is not terminated. */
1980 if (first_line_ended_crlf == TRUE_UNSET)
1981 first_line_ended_crlf = FALSE;
1982 else if (first_line_ended_crlf)
1983 receive_ungetc(' ');
1987 /* This is not the end of the line. If this is SMTP input and this is
1988 the first character in the line and it is a "." character, ignore it.
1989 This implements the dot-doubling rule, though header lines starting with
1990 dots aren't exactly common. They are legal in RFC 822, though. If the
1991 following is CRLF or LF, this is the line that that terminates the
1993 entire message. We set message_ended to indicate this has happened (to
1994 prevent further reading), and break out of the loop, having freed the
1995 empty header, and set next = NULL to indicate no data line. */
1997 if (f.dot_ends && ptr == 0 && ch == '.')
1999 /* leading dot while in headers-read mode */
2000 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2001 if (ch == '\n' && first_line_ended_crlf == TRUE /* and not TRUE_UNSET */ )
2002 /* dot, LF but we are in CRLF mode. Attack? */
2003 ch = ' '; /* replace the LF with a space */
2005 else if (ch == '\r')
2007 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2010 if (ch >= 0) receive_ungetc(ch);
2011 ch = '\r'; /* Revert to CR */
2016 message_ended = END_DOT;
2017 reset_point = store_reset(reset_point);
2019 break; /* End character-reading loop */
2022 /* For non-SMTP input, the dot at the start of the line was really a data
2023 character. What is now in ch is the following character. We guaranteed
2024 enough space for this above. */
2028 next->text[ptr++] = '.';
2033 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
2034 remember this case if this is the first line ending. */
2038 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2041 if (first_line_ended_crlf == TRUE_UNSET)
2042 first_line_ended_crlf = TRUE;
2046 /* Otherwise, put back the character after CR, and turn the bare CR
2049 if (ch >= 0) (receive_ungetc)(ch);
2050 next->text[ptr++] = '\n';
2055 /* We have a data character for the header line. */
2057 next->text[ptr++] = ch; /* Add to buffer */
2058 message_size++; /* Total message size so far */
2060 /* Handle failure due to a humungously long header section. The >= allows
2061 for the terminating \n. Add what we have so far onto the headers list so
2062 that it gets reflected in any error message, and back up the just-read
2065 if (message_size >= header_maxsize)
2068 next->text[ptr] = 0;
2070 next->type = htype_other;
2072 header_last->next = next;
2075 log_write(0, LOG_MAIN, "ridiculously long message header received from "
2076 "%s (more than %d characters): message abandoned",
2077 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
2081 smtp_reply = US"552 Message header is ridiculously long";
2082 receive_swallow_smtp();
2083 goto TIDYUP; /* Skip to end of function */
2088 give_local_error(ERRMESS_VLONGHEADER,
2089 string_sprintf("message header longer than %d characters received: "
2090 "message not accepted", header_maxsize), US"", error_rc, stdin,
2092 /* Does not return */
2096 continue; /* With next input character */
2098 /* End of header line reached */
2102 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2104 receive_linecount++;
2105 message_linecount++;
2107 /* Keep track of maximum line length */
2109 if (ptr - prevlines_length > max_received_linelength)
2110 max_received_linelength = ptr - prevlines_length;
2111 prevlines_length = ptr + 1;
2113 /* Now put in the terminating newline. There is always space for
2114 at least two more characters. */
2116 next->text[ptr++] = '\n';
2119 /* A blank line signals the end of the headers; release the unwanted
2120 space and set next to NULL to indicate this. */
2124 reset_point = store_reset(reset_point);
2129 /* There is data in the line; see if the next input character is a
2130 whitespace character. If it is, we have a continuation of this header line.
2131 There is always space for at least one character at this point. */
2135 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2136 if (nextch == ' ' || nextch == '\t')
2138 next->text[ptr++] = nextch;
2139 if (++message_size >= header_maxsize)
2141 continue; /* Iterate the loop */
2143 else if (nextch >= 0) /* not EOF, ERR etc */
2144 (receive_ungetc)(nextch); /* For next time */
2145 else ch = nextch; /* Cause main loop to exit at end */
2148 /* We have got to the real line end. Terminate the string and release store
2149 beyond it. If it turns out to be a real header, internal binary zeros will
2150 be squashed later. */
2152 next->text[ptr] = 0;
2154 store_release_above(next->text + ptr + 1);
2156 /* Check the running total size against the overall message size limit. We
2157 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2158 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2159 headers - the code to read the body will then also hit the buffer. */
2161 if (message_size > thismessage_size_limit) break;
2163 /* A line that is not syntactically correct for a header also marks
2164 the end of the headers. In this case, we leave next containing the
2165 first data line. This might actually be several lines because of the
2166 continuation logic applied above, but that doesn't matter.
2168 It turns out that smail, and presumably sendmail, accept leading lines
2171 From ph10 Fri Jan 5 12:35 GMT 1996
2173 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2174 find any documentation of this, but for compatibility it had better be
2175 accepted. Exim restricts it to the case of non-smtp messages, and
2176 treats it as an alternative to the -f command line option. Thus it is
2177 ignored except for trusted users or filter testing. Otherwise it is taken
2178 as the sender address, unless -f was used (sendmail compatibility).
2180 It further turns out that some UUCPs generate the From_line in a different
2183 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2185 The regex for matching these things is now capable of recognizing both
2186 formats (including 2- and 4-digit years in the latter). In fact, the regex
2187 is now configurable, as is the expansion string to fish out the sender.
2189 Even further on it has been discovered that some broken clients send
2190 these lines in SMTP messages. There is now an option to ignore them from
2191 specified hosts or networks. Sigh. */
2193 if ( header_last == header_list
2195 || ( sender_host_address
2196 && verify_check_host(&ignore_fromline_hosts) == OK
2198 || (!sender_host_address && ignore_fromline_local)
2200 && regex_match_and_setup(regex_From, next->text, 0, -1)
2203 if (!f.sender_address_forced)
2205 uschar * uucp_sender;
2206 GET_OPTION("uucp_from_sender");
2207 if (!(uucp_sender = expand_string(uucp_from_sender)))
2208 log_write(0, LOG_MAIN|LOG_PANIC,
2209 "expansion of \"%s\" failed after matching "
2210 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2213 int start, end, domain;
2215 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2216 &start, &end, &domain, TRUE);
2219 if (domain == 0 && newsender[0] != 0)
2220 /* deconst ok as newsender was not const */
2221 newsender = US rewrite_address_qualify(newsender, FALSE);
2223 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2225 sender_address = newsender;
2227 if (f.trusted_caller || filter_test != FTEST_NONE)
2229 authenticated_sender = NULL;
2230 originator_name = US"";
2231 f.sender_local = FALSE;
2234 if (filter_test != FTEST_NONE)
2235 printf("Sender taken from \"From \" line\n");
2242 /* Not a leading "From " line. Check to see if it is a valid header line.
2243 Header names may contain any non-control characters except space and colon,
2248 uschar * p = next->text;
2250 /* If not a valid header line, break from the header reading loop, leaving
2251 next != NULL, indicating that it holds the first line of the body. */
2253 if (isspace(*p)) break;
2254 while (mac_isgraph(*p) && *p != ':') p++;
2255 if (Uskip_whitespace(&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 #ifdef SUPPORT_DMARC
2451 if (!is_resent) dmarc_from_header = h;
2453 if (!resents_exist || is_resent)
2459 uschar * s = Ustrchr(h->text, ':') + 1;
2461 Uskip_whitespace(&s);
2462 len = h->slen - (s - h->text) - 1;
2463 if (Ustrlen(originator_login) == len &&
2464 strncmpic(s, originator_login, len) == 0)
2466 uschar * name = is_resent ? US"Resent-From" : US"From";
2467 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2468 originator_login, qualify_domain_sender);
2469 from_header = header_last;
2470 h->type = htype_old;
2471 DEBUG(D_receive|D_rewrite)
2472 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2478 /* Identify the Message-id: header for generating "in-reply-to" in the
2479 autoreply transport. For incoming logging, save any resent- value. In both
2480 cases, take just the first of any multiples. */
2483 if (!msgid_header && (!resents_exist || is_resent))
2490 /* Flag all Received: headers */
2492 case htype_received:
2493 h->type = htype_received;
2497 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2499 case htype_reply_to:
2500 h->type = htype_reply_to;
2503 /* The Return-path: header is supposed to be added to messages when
2504 they leave the SMTP system. We shouldn't receive messages that already
2505 contain Return-path. However, since Exim generates Return-path: on
2506 local delivery, resent messages may well contain it. We therefore
2507 provide an option (which defaults on) to remove any Return-path: headers
2508 on input. Removal actually means flagging as "old", which prevents the
2509 header being transmitted with the message. */
2511 case htype_return_path:
2512 if (return_path_remove) h->type = htype_old;
2514 /* If we are testing a mail filter file, use the value of the
2515 Return-Path: header to set up the return_path variable, which is not
2516 otherwise set. However, remove any <> that surround the address
2517 because the variable doesn't have these. */
2519 if (filter_test != FTEST_NONE)
2521 uschar * start = h->text + 12;
2522 uschar * end = start + Ustrlen(start);
2524 Uskip_whitespace(&start);
2525 while (end > start && isspace(end[-1])) end--;
2526 if (*start == '<' && end[-1] == '>')
2528 return_path = string_copyn(start, end - start);
2529 printf("Return-path taken from \"Return-path:\" header line\n");
2533 /* If there is a "Sender:" header and the message is locally originated,
2534 and from an untrusted caller and suppress_local_fixups is not set, or if we
2535 are in submission mode for a remote message, mark it "old" so that it will
2536 not be transmitted with the message, unless active_local_sender_retain is
2537 set. (This can only be true if active_local_from_check is false.) If there
2538 are any resent- headers in the message, apply this rule to Resent-Sender:
2539 instead of Sender:. Messages with multiple resent- header sets cannot be
2540 tidily handled. (For this reason, at least one MUA - Pine - turns old
2541 resent- headers into X-resent- headers when resending, leaving just one
2545 h->type = !f.active_local_sender_retain
2546 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2547 || f.submission_mode
2549 && (!resents_exist || is_resent)
2550 ? htype_old : htype_sender;
2553 /* Remember the Subject: header for logging. There is no Resent-Subject */
2559 /* "To:" gets flagged, and the existence of a recipient header is noted,
2560 whether it's resent- or not. */
2565 to_or_cc_header_exists = TRUE;
2571 /* Extract recipients from the headers if that is required (the -t option).
2572 Note that this is documented as being done *before* any address rewriting takes
2573 place. There are two possibilities:
2575 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2576 recipients already listed are to be REMOVED from the message. Smail 3 works
2577 like this. We need to build a non-recipients tree for that list, because in
2578 subsequent processing this data is held in a tree and that's what the
2579 spool_write_header() function expects. Make sure that non-recipient addresses
2580 are fully qualified and rewritten if necessary.
2582 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2583 those in the command line arguments (and it is rumoured some other MTAs do
2584 this). Therefore, there is an option to make Exim behave this way.
2586 *** Notes on "Resent-" header lines ***
2588 The presence of resent-headers in the message makes -t horribly ambiguous.
2589 Experiments with sendmail showed that it uses recipients for all resent-
2590 headers, totally ignoring the concept of "sets of resent- headers" as described
2591 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2592 with all the addresses in one instance of each header.
2594 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2595 error for -t if there were resent- headers in the message. However, after a
2596 discussion on the mailing list, I've learned that there are MUAs that use
2597 resent- headers with -t, and also that the stuff about sets of resent- headers
2598 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2599 message with -t and resent- header lines makes sure that only *its* resent-
2600 headers are present; previous ones are often renamed as X-resent- for example.
2602 Consequently, Exim has been changed so that, if any resent- header lines are
2603 present, the recipients are taken from all of the appropriate resent- lines,
2604 and not from the ordinary To:, Cc:, etc. */
2609 error_block **bnext = &bad_addresses;
2611 if (extract_addresses_remove_arguments)
2613 while (recipients_count-- > 0)
2615 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2616 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2617 tree_add_nonrecipient(s);
2619 recipients_list = NULL;
2620 recipients_count = recipients_list_max = 0;
2623 /* Now scan the headers */
2625 for (header_line * h = header_list->next; h; h = h->next)
2627 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2628 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2630 uschar * s = Ustrchr(h->text, ':') + 1;
2631 Uskip_whitespace(&s);
2633 f.parse_allow_group = TRUE; /* Allow address group syntax */
2637 uschar *ss = parse_find_address_end(s, FALSE);
2638 uschar *recipient, *errmess, *pp;
2639 int start, end, domain;
2641 /* Check on maximum */
2643 if (recipients_max_expanded > 0 && ++rcount > recipients_max_expanded)
2644 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2645 US"message rejected: ", error_rc, stdin, NULL);
2646 /* Does not return */
2648 /* Make a copy of the address, and remove any internal newlines. These
2649 may be present as a result of continuations of the header line. The
2650 white space that follows the newline must not be removed - it is part
2653 pp = recipient = store_get(ss - s + 1, s);
2654 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2659 BOOL b = allow_utf8_domains;
2660 allow_utf8_domains = TRUE;
2662 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2667 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2668 else allow_utf8_domains = b;
2674 /* Keep a list of all the bad addresses so we can send a single
2675 error message at the end. However, an empty address is not an error;
2676 just ignore it. This can come from an empty group list like
2678 To: Recipients of list:;
2680 If there are no recipients at all, an error will occur later. */
2682 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2684 int len = Ustrlen(s);
2685 error_block * b = store_get(sizeof(error_block), GET_UNTAINTED);
2686 while (len > 0 && isspace(s[len-1])) len--;
2688 b->text1 = string_printing(string_copyn(s, len));
2694 /* If the recipient is already in the nonrecipients tree, it must
2695 have appeared on the command line with the option extract_addresses_
2696 remove_arguments set. Do not add it to the recipients, and keep a note
2697 that this has happened, in order to give a better error if there are
2698 no recipients left. */
2702 if (tree_search(tree_nonrecipients, recipient) == NULL)
2703 receive_add_recipient(recipient, -1);
2705 extracted_ignored = TRUE;
2708 /* Move on past this address */
2710 s = ss + (*ss ? 1 : 0);
2711 Uskip_whitespace(&s);
2712 } /* Next address */
2714 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2715 f.parse_found_group = FALSE;
2717 /* If this was the bcc: header, mark it "old", which means it
2718 will be kept on the spool, but not transmitted as part of the
2721 if (h->type == htype_bcc) h->type = htype_old;
2722 } /* For appropriate header line */
2723 } /* For each header line */
2727 /* Now build the unique message id. This has changed several times over the
2728 lifetime of Exim, and is changing for Exim 4.97.
2729 The previous change was in about 2003.
2731 Detail for the pre-4.97 version is here in [square-brackets].
2733 The message ID has 3 parts: tttttt-ppppppppppp-ssss (6, 11, 4 - total 23 with
2734 the dashes). Each part is a number in base 62.
2735 [ tttttt-pppppp-ss 6, 6, 2 => 16 ]
2737 The first part is the current time, in seconds. Six chars is enough until
2738 year 3700 with case-sensitive filesystes, but will run out in 2038 on
2739 case-insensitive ones (Cygwin, Darwin - where we have to use base-36.
2740 Both of those are in the "unsupported" bucket, so ignore for now).
2742 The second part is the current pid, and supports 64b [31b] PIDs.
2744 The third part holds sub-second time, plus (when localhost_number is set)
2745 the host number multiplied by a number large enough to keep it away from
2746 the time portion. Host numbers are restricted to the range 0-16.
2747 The time resolution is variously 1, 2 or 4 microseconds [0.5 or 1 ms]
2748 depending on the use of localhost_nubmer and of case-insensitive filesystems.
2750 After a message has been received, Exim ensures that the timer has ticked at the
2751 appropriate level before proceeding, to avoid duplication if the pid happened to
2752 be re-used within the same time period. It seems likely that most messages will
2753 take at least half a millisecond to be received, so no delay will normally be
2754 necessary. At least for some time...
2756 Note that string_base62_XX() returns its data in a static storage block, so it
2757 must be copied before calling string_base62_XXX) again. It always returns exactly
2758 11 (_64) or 6 (_32) characters.
2760 There doesn't seem to be anything in the RFC which requires a message id to
2761 start with a letter, but Smail was changed to ensure this. The external form of
2762 the message id (as supplied by string expansion) therefore starts with an
2763 additional leading 'E'. The spool file names do not include this leading
2764 letter and it is not used internally.
2766 NOTE: If ever the format of message ids is changed, the regular expression for
2767 checking that a string is in this format must be updated in a corresponding
2768 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2769 must also be changed to reflect the correct string length. The queue-sort code
2770 needs to know the layout. Then, of course, other programs that rely on the
2771 message id format will need updating too (inc. at least exim_msgdate). */
2773 Ustrncpy(message_id, string_base62_32((long int)(message_id_tv.tv_sec)), MESSAGE_ID_TIME_LEN);
2774 message_id[MESSAGE_ID_TIME_LEN] = '-';
2775 Ustrncpy(message_id + MESSAGE_ID_TIME_LEN + 1,
2776 string_base62_64((long int)getpid()),
2780 /* Deal with the case where the host number is set. The value of the number was
2781 checked when it was read, to ensure it isn't too big. */
2783 if (host_number_string)
2784 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2785 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2786 string_base62_32((long int)(
2787 host_number * (1000000/id_resolution)
2788 + message_id_tv.tv_usec/id_resolution))
2789 + (6 - MESSAGE_ID_SUBTIME_LEN)
2792 /* Host number not set: final field is just the fractional time at an
2793 appropriate resolution. */
2796 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2797 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2798 string_base62_32((long int)(message_id_tv.tv_usec/id_resolution))
2799 + (6 - MESSAGE_ID_SUBTIME_LEN));
2801 /* Add the current message id onto the current process info string if
2804 (void)string_format(process_info + process_info_len,
2805 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2807 /* If we are using multiple input directories, set up the one for this message
2808 to be the least significant base-62 digit of the time of arrival. Otherwise
2809 ensure that it is an empty string. */
2811 set_subdir_str(message_subdir, message_id, 0);
2813 /* Now that we have the message-id, if there is no message-id: header, generate
2814 one, but only for local (without suppress_local_fixups) or submission mode
2815 messages. This can be user-configured if required, but we had better flatten
2816 any illegal characters therein. */
2819 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2821 uschar *id_text = US"";
2822 uschar *id_domain = primary_hostname;
2825 /* Permit only letters, digits, dots, and hyphens in the domain */
2827 GET_OPTION("message_id_header_domain");
2828 if (message_id_domain)
2830 uschar *new_id_domain = expand_string(message_id_domain);
2833 if (!f.expand_string_forcedfail)
2834 log_write(0, LOG_MAIN|LOG_PANIC,
2835 "expansion of \"%s\" (message_id_header_domain) "
2836 "failed: %s", message_id_domain, expand_string_message);
2838 else if (*new_id_domain)
2840 id_domain = new_id_domain;
2841 for (uschar * p = id_domain; *p; p++)
2842 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2846 /* Permit all characters except controls and RFC 2822 specials in the
2847 additional text part. */
2849 GET_OPTION("message_id_header_text");
2850 if (message_id_text)
2852 uschar *new_id_text = expand_string(message_id_text);
2855 if (!f.expand_string_forcedfail)
2856 log_write(0, LOG_MAIN|LOG_PANIC,
2857 "expansion of \"%s\" (message_id_header_text) "
2858 "failed: %s", message_id_text, expand_string_message);
2860 else if (*new_id_text)
2862 id_text = new_id_text;
2863 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2867 /* Add the header line.
2868 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2869 appended, to preserve classical expectations of header ordering. */
2871 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2872 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2873 *id_text == 0 ? "" : ".", id_text, id_domain);
2875 /* Arrange for newly-created Message-Id to be logged */
2879 msgid_header_newly_created = TRUE;
2884 /* If we are to log recipients, keep a copy of the raw ones before any possible
2885 rewriting. Must copy the count, because later ACLs and the local_scan()
2886 function may mess with the real recipients. */
2888 if (LOGGING(received_recipients))
2890 raw_recipients = store_get(recipients_count * sizeof(uschar *), GET_UNTAINTED);
2891 for (int i = 0; i < recipients_count; i++)
2892 raw_recipients[i] = string_copy(recipients_list[i].address);
2893 raw_recipients_count = recipients_count;
2896 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2897 recipients will get here only if the conditions were right (allow_unqualified_
2898 recipient is TRUE). */
2901 { debug_printf_indent("qualify & rewrite recipients list\n"); acl_level++; }
2902 for (int i = 0; i < recipients_count; i++)
2903 recipients_list[i].address = /* deconst ok as src was not cont */
2904 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2905 global_rewrite_rules, rewrite_existflags);
2906 DEBUG(D_rewrite) acl_level--;
2908 /* If there is no From: header, generate one for local (without
2909 suppress_local_fixups) or submission_mode messages. If there is no sender
2910 address, but the sender is local or this is a local delivery error, use the
2911 originator login. This shouldn't happen for genuine bounces, but might happen
2912 for autoreplies. The addition of From: must be done *before* checking for the
2913 possible addition of a Sender: header, because untrusted_set_sender allows an
2914 untrusted user to set anything in the envelope (which might then get info
2915 From:) but we still want to ensure a valid Sender: if it is required. */
2918 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2920 const uschar * oname = US"";
2922 /* Use the originator_name if this is a locally submitted message and the
2923 caller is not trusted. For trusted callers, use it only if -F was used to
2924 force its value or if we have a non-SMTP message for which -f was not used
2925 to set the sender. */
2927 if (!sender_host_address)
2929 if (!f.trusted_caller || f.sender_name_forced ||
2930 (!smtp_input && !f.sender_address_forced))
2931 oname = originator_name;
2934 /* For non-locally submitted messages, the only time we use the originator
2935 name is when it was forced by the /name= option on control=submission. */
2937 else if (submission_name) oname = submission_name;
2939 /* Envelope sender is empty */
2941 if (!*sender_address)
2943 uschar *fromstart, *fromend;
2945 fromstart = string_sprintf("%sFrom: %s%s",
2946 resent_prefix, oname, *oname ? " <" : "");
2947 fromend = *oname ? US">" : US"";
2949 if (f.sender_local || f.local_error_message)
2950 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2951 local_part_quote(originator_login), qualify_domain_sender,
2954 else if (f.submission_mode && authenticated_id)
2956 if (!submission_domain)
2957 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2958 local_part_quote(authenticated_id), qualify_domain_sender,
2961 else if (!*submission_domain) /* empty => whole address set */
2962 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2966 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2967 local_part_quote(authenticated_id), submission_domain, fromend);
2969 from_header = header_last; /* To get it checked for Sender: */
2973 /* There is a non-null envelope sender. Build the header using the original
2974 sender address, before any rewriting that might have been done while
2979 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2982 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2985 from_header = header_last; /* To get it checked for Sender: */
2990 /* If the sender is local (without suppress_local_fixups), or if we are in
2991 submission mode and there is an authenticated_id, check that an existing From:
2992 is correct, and if not, generate a Sender: header, unless disabled. Any
2993 previously-existing Sender: header was removed above. Note that sender_local,
2994 as well as being TRUE if the caller of exim is not trusted, is also true if a
2995 trusted caller did not supply a -f argument for non-smtp input. To allow
2996 trusted callers to forge From: without supplying -f, we have to test explicitly
2997 here. If the From: header contains more than one address, then the call to
2998 parse_extract_address fails, and a Sender: header is inserted, as required. */
3001 && ( f.active_local_from_check
3002 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
3003 || f.submission_mode && authenticated_id
3006 BOOL make_sender = TRUE;
3007 int start, end, domain;
3009 uschar *from_address =
3010 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
3011 &start, &end, &domain, FALSE);
3012 uschar *generated_sender_address;
3014 generated_sender_address = f.submission_mode
3015 ? !submission_domain
3016 ? string_sprintf("%s@%s",
3017 local_part_quote(authenticated_id), qualify_domain_sender)
3018 : !*submission_domain /* empty => full address */
3019 ? string_sprintf("%s", authenticated_id)
3020 : string_sprintf("%s@%s",
3021 local_part_quote(authenticated_id), submission_domain)
3022 : string_sprintf("%s@%s",
3023 local_part_quote(originator_login), qualify_domain_sender);
3025 /* Remove permitted prefixes and suffixes from the local part of the From:
3026 address before doing the comparison with the generated sender. */
3031 uschar *at = domain ? from_address + domain - 1 : NULL;
3034 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
3035 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
3037 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
3038 from_address += slen;
3042 if ( strcmpic(generated_sender_address, from_address) == 0
3043 || (!domain && strcmpic(from_address, originator_login) == 0))
3044 make_sender = FALSE;
3047 /* We have to cause the Sender header to be rewritten if there are
3048 appropriate rewriting rules. */
3051 if (f.submission_mode && !submission_name)
3052 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
3053 generated_sender_address);
3055 header_add(htype_sender, "%sSender: %s <%s>\n",
3057 f.submission_mode ? submission_name : originator_name,
3058 generated_sender_address);
3060 /* Ensure that a non-null envelope sender address corresponds to the
3061 submission mode sender address. */
3063 if (f.submission_mode && *sender_address)
3065 if (!sender_address_unrewritten)
3066 sender_address_unrewritten = sender_address;
3067 sender_address = generated_sender_address;
3068 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
3069 log_write(L_address_rewrite, LOG_MAIN,
3070 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
3071 sender_address_unrewritten, generated_sender_address);
3075 /* If there are any rewriting rules, apply them to the sender address, unless
3076 it has already been rewritten as part of verification for SMTP input. */
3079 { debug_printf("rewrite rules on sender address\n"); acl_level++; }
3080 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
3082 /* deconst ok as src was not const */
3083 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
3084 global_rewrite_rules, rewrite_existflags);
3085 DEBUG(D_receive|D_rewrite)
3086 debug_printf("rewritten sender = %s\n", sender_address);
3088 DEBUG(D_rewrite) acl_level--;
3091 /* The headers must be run through rewrite_header(), because it ensures that
3092 addresses are fully qualified, as well as applying any rewriting rules that may
3095 Qualification of header addresses in a message from a remote host happens only
3096 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
3097 appropriate. For local messages, qualification always happens, unless -bnq is
3098 used to explicitly suppress it. No rewriting is done for an unqualified address
3099 that is left untouched.
3101 We start at the second header, skipping our own Received:. This rewriting is
3102 documented as happening *after* recipient addresses are taken from the headers
3103 by the -t command line option. An added Sender: gets rewritten here. */
3106 { debug_printf("qualify and rewrite headers\n"); acl_level++; }
3107 for (header_line * h = header_list->next, * newh; h; h = h->next)
3108 if ((newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3109 rewrite_existflags, TRUE)))
3111 DEBUG(D_rewrite) acl_level--;
3114 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3115 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3116 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3117 exists, this applies to the set of resent- headers rather than the normal set.
3119 The requirement for a recipient header has been removed in RFC 2822. At this
3120 point in the code, earlier versions of Exim added a To: header for locally
3121 submitted messages, and an empty Bcc: header for others. In the light of the
3122 changes in RFC 2822, this was dropped in November 2003. */
3125 /* If there is no date header, generate one if the message originates locally
3126 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3127 submission mode flag is set. Messages without Date: are not valid, but it seems
3128 to be more confusing if Exim adds one to all remotely-originated messages.
3129 As per Message-Id, we prepend if resending, else append.
3132 if ( !date_header_exists
3133 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3134 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3135 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3137 search_tidyup(); /* Free any cached resources */
3139 /* Show the complete set of headers if debugging. Note that the first one (the
3140 new Received:) has not yet been set. */
3144 debug_printf(">>Headers after rewriting and local additions:\n");
3146 for (header_line * h = header_list->next; h; h = h->next)
3147 debug_printf_indent("%c %s", h->type, h->text);
3152 /* The headers are now complete in store. If we are running in filter
3153 testing mode, that is all this function does. Return TRUE if the message
3154 ended with a dot. */
3156 if (filter_test != FTEST_NONE)
3158 process_info[process_info_len] = 0;
3159 return message_ended == END_DOT;
3162 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3163 think more if it could be handled. Cannot do onward CHUNKING unless
3164 inbound is, but inbound chunking ought to be ok with outbound plain.
3165 Could we do onward CHUNKING given inbound CHUNKING?
3167 if (chunking_state > CHUNKING_OFFERED)
3168 cancel_cutthrough_connection(FALSE, US"chunking active");
3170 /* Cutthrough delivery:
3171 We have to create the Received header now rather than at the end of reception,
3172 so the timestamp behaviour is a change to the normal case.
3173 Having created it, send the headers to the destination. */
3175 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3177 if (received_count > received_headers_max)
3179 cancel_cutthrough_connection(TRUE, US"too many headers");
3180 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3181 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3182 "Too many \"Received\" headers",
3184 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3185 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3186 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3187 goto NOT_ACCEPTED; /* Skip to end of function */
3189 received_header_gen();
3190 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3191 (void) cutthrough_headers_send();
3195 /* Open a new spool file for the data portion of the message. We need
3196 to access it both via a file descriptor and a stdio stream. Try to make the
3197 directory if it isn't there. */
3199 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3200 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3202 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3204 if (errno == ENOENT)
3206 (void) directory_make(spool_directory,
3207 spool_sname(US"input", message_subdir),
3208 INPUT_DIRECTORY_MODE, TRUE);
3209 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3212 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3213 spool_name, strerror(errno));
3216 /* Make sure the file's group is the Exim gid, and double-check the mode
3217 because the group setting doesn't always get set automatically. */
3219 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3220 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3221 "Failed setting ownership on spool file %s: %s",
3222 spool_name, strerror(errno));
3223 (void)fchmod(data_fd, SPOOL_MODE);
3225 /* We now have data file open. Build a stream for it and lock it. We lock only
3226 the first line of the file (containing the message ID) because otherwise there
3227 are problems when Exim is run under Cygwin (I'm told). See comments in
3228 spool_in.c, where the same locking is done. */
3230 spool_data_file = fdopen(data_fd, "w+");
3231 lock_data.l_type = F_WRLCK;
3232 lock_data.l_whence = SEEK_SET;
3233 lock_data.l_start = 0;
3234 lock_data.l_len = spool_data_start_offset(message_id);
3236 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3237 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3238 errno, strerror(errno));
3240 /* We have an open, locked data file. Write the message id to it to make it
3241 self-identifying. Then read the remainder of the input of this message and
3242 write it to the data file. If the variable next != NULL, it contains the first
3243 data line (which was read as a header but then turned out not to have the right
3244 format); write it (remembering that it might contain binary zeros). The result
3245 of fwrite() isn't inspected; instead we call ferror() below. */
3247 fprintf(spool_data_file, "%s-D\n", message_id);
3250 uschar *s = next->text;
3251 int len = next->slen;
3252 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3253 body_linecount++; /* Assumes only 1 line */
3256 /* Note that we might already be at end of file, or the logical end of file
3257 (indicated by '.'), or might have encountered an error while writing the
3258 message id or "next" line. */
3260 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3264 message_ended = chunking_state <= CHUNKING_OFFERED
3265 ? read_message_data_smtp(spool_data_file, first_line_ended_crlf)
3267 ? read_message_bdat_smtp_wire(spool_data_file)
3268 : read_message_bdat_smtp(spool_data_file);
3269 receive_linecount++; /* The terminating "." line */
3272 message_ended = read_message_data(spool_data_file);
3274 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3275 message_linecount += body_linecount;
3277 switch (message_ended)
3279 /* Handle premature termination of SMTP */
3284 Uunlink(spool_name); /* Lose data file when closed */
3285 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3286 smtp_reply = handle_lost_connection(US"");
3288 goto NOT_ACCEPTED; /* Skip to end of function */
3292 /* Handle message that is too big. Don't use host_or_ident() in the log
3293 message; we want to see the ident value even for non-remote messages. */
3296 Uunlink(spool_name); /* Lose the data file when closed */
3297 cancel_cutthrough_connection(TRUE, US"mail too big");
3298 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3300 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3301 "message too big: read=%d max=%d",
3303 sender_fullhost ? " H=" : "",
3304 sender_fullhost ? sender_fullhost : US"",
3305 sender_ident ? " U=" : "",
3306 sender_ident ? sender_ident : US"",
3308 thismessage_size_limit);
3312 smtp_reply = US"552 Message size exceeds maximum permitted";
3313 goto NOT_ACCEPTED; /* Skip to end of function */
3317 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3318 give_local_error(ERRMESS_TOOBIG,
3319 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3320 US"message rejected: ", error_rc, spool_data_file, header_list);
3321 /* Does not return */
3325 /* Handle bad BDAT protocol sequence */
3328 Uunlink(spool_name); /* Lose the data file when closed */
3329 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3330 smtp_reply = US""; /* Response already sent */
3331 goto NOT_ACCEPTED; /* Skip to end of function */
3335 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3336 example, there may be some expansion in an ACL that uses a timer.) */
3338 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3340 /* The message body has now been read into the data file. Call fflush() to
3341 empty the buffers in C, and then call fsync() to get the data written out onto
3342 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3343 having to do this). If there was an I/O error on either input or output,
3344 attempt to send an error message, and unlink the spool file. For non-SMTP input
3345 we can then give up. Note that for SMTP input we must swallow the remainder of
3346 the input in cases of output errors, since the far end doesn't expect to see
3347 anything until the terminating dot line is sent. */
3349 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3350 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3352 uschar *msg_errno = US strerror(errno);
3353 BOOL input_error = (receive_ferror)() != 0;
3354 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3355 input_error? "Input read" : "Spool write",
3357 sender_fullhost ? sender_fullhost : sender_ident);
3359 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3360 Uunlink(spool_name); /* Lose the data file */
3361 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3366 smtp_reply = US"451 Error while reading input data";
3369 smtp_reply = US"451 Error while writing spool file";
3370 receive_swallow_smtp();
3372 goto NOT_ACCEPTED; /* Skip to end of function */
3377 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3378 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3380 /* Does not return */
3385 /* No I/O errors were encountered while writing the data file. */
3387 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3388 gettimeofday(&received_time_complete, NULL);
3391 /* If there were any bad addresses extracted by -t, or there were no recipients
3392 left after -t, send a message to the sender of this message, or write it to
3393 stderr if the error handling option is set that way. Note that there may
3394 legitimately be no recipients for an SMTP message if they have all been removed
3397 We need to rewind the data file in order to read it. In the case of no
3398 recipients or stderr error writing, throw the data file away afterwards, and
3399 exit. (This can't be SMTP, which always ensures there's at least one
3400 syntactically good recipient address.) */
3402 if (extract_recip && (bad_addresses || recipients_count == 0))
3406 if (recipients_count == 0) debug_printf("*** No recipients\n");
3409 debug_printf("*** Bad address(es)\n");
3410 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3411 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3415 log_write(0, LOG_MAIN|LOG_PANIC, "%s found in headers",
3416 bad_addresses ? "bad addresses" : "no recipients");
3418 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3420 /* If configured to send errors to the sender, but this fails, force
3421 a failure error code. We use a special one for no recipients so that it
3422 can be detected by the autoreply transport. Otherwise error_rc is set to
3423 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3424 it is EXIT_SUCCESS. */
3426 if (error_handling == ERRORS_SENDER)
3428 if (!moan_to_sender(
3430 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3431 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3432 bad_addresses, header_list, spool_data_file, FALSE
3434 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3439 if (extracted_ignored)
3440 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3442 fprintf(stderr, "exim: no recipients in message\n");
3445 fprintf(stderr, "exim: invalid address%s",
3446 bad_addresses->next ? "es:\n" : ":");
3447 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3448 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3449 bad_addresses->text2);
3453 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3455 Uunlink(spool_name);
3456 (void)fclose(spool_data_file);
3457 exim_exit(error_rc);
3461 /* Data file successfully written. Generate text for the Received: header by
3462 expanding the configured string, and adding a timestamp. By leaving this
3463 operation till now, we ensure that the timestamp is the time that message
3464 reception was completed. However, this is deliberately done before calling the
3465 data ACL and local_scan().
3467 This Received: header may therefore be inspected by the data ACL and by code in
3468 the local_scan() function. When they have run, we update the timestamp to be
3469 the final time of reception.
3471 If there is just one recipient, set up its value in the $received_for variable
3472 for use when we generate the Received: header.
3474 Note: the checking for too many Received: headers is handled by the delivery
3476 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3478 if (!received_header->text) /* Non-cutthrough case */
3480 received_header_gen();
3482 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3484 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3485 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3487 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3488 now, before running the DATA ACL. */
3490 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3493 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3494 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3496 /* If an ACL is specified for checking things at this stage of reception of a
3497 message, run it, unless all the recipients were removed by "discard" in earlier
3498 ACLs. That is the only case in which recipients_count can be zero at this
3499 stage. Set deliver_datafile to point to the data file so that $message_body and
3500 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3503 deliver_datafile = data_fd;
3506 f.enable_dollar_recipients = TRUE;
3508 if (recipients_count == 0)
3509 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3513 /* Handle interactive SMTP messages */
3515 if (smtp_input && !smtp_batched_input)
3518 #ifndef DISABLE_DKIM
3519 if (!f.dkim_disable_verify)
3521 /* Finish verification */
3522 dkim_exim_verify_finish();
3524 /* Check if we must run the DKIM ACL */
3525 GET_OPTION("acl_smtp_dkim");
3526 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3528 uschar * dkim_verify_signers_expanded =
3529 expand_string(dkim_verify_signers);
3530 gstring * results = NULL;
3534 gstring * seen_items = NULL;
3535 int old_pool = store_pool;
3537 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3539 if (!(ptr = dkim_verify_signers_expanded))
3540 log_write(0, LOG_MAIN|LOG_PANIC,
3541 "expansion of dkim_verify_signers option failed: %s",
3542 expand_string_message);
3544 /* Default to OK when no items are present */
3546 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3548 /* Prevent running ACL for an empty item */
3549 if (!item || !*item) continue;
3551 /* Only run ACL once for each domain or identity,
3552 no matter how often it appears in the expanded list. */
3556 const uschar * seen_items_list = string_from_gstring(seen_items);
3558 BOOL seen_this_item = FALSE;
3560 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3562 if (Ustrcmp(seen_item,item) == 0)
3564 seen_this_item = TRUE;
3571 debug_printf("acl_smtp_dkim: skipping signer %s, "
3572 "already seen\n", item);
3576 seen_items = string_catn(seen_items, US":", 1);
3578 seen_items = string_cat(seen_items, item);
3580 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3584 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3585 "skipping remaining items\n", rc, item);
3586 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3590 dkim_verify_status = string_from_gstring(results);
3591 store_pool = old_pool;
3592 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3595 recipients_count = 0;
3596 blackholed_by = US"DKIM ACL";
3598 blackhole_log_msg = string_sprintf(": %s", log_msg);
3602 Uunlink(spool_name);
3603 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3604 smtp_yield = FALSE; /* No more messages after dropped connection */
3605 smtp_reply = US""; /* Indicate reply already sent */
3606 goto NOT_ACCEPTED; /* Skip to end of function */
3610 dkim_exim_verify_log_all();
3612 #endif /* DISABLE_DKIM */
3614 #ifdef WITH_CONTENT_SCAN
3615 if (recipients_count > 0)
3617 GET_OPTION("acl_smtp_mime");
3619 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3623 #endif /* WITH_CONTENT_SCAN */
3625 #ifdef SUPPORT_DMARC
3626 dmarc_store_data(dmarc_from_header);
3629 #ifndef DISABLE_PRDR
3630 if (prdr_requested && recipients_count > 1)
3632 GET_OPTION("acl_smtp_data_prdr");
3633 if (acl_smtp_data_prdr)
3636 int all_fail = FAIL;
3638 smtp_printf("353 PRDR content analysis beginning\r\n", SP_MORE);
3639 /* Loop through recipients, responses must be in same order received */
3640 for (unsigned int c = 0; recipients_count > c; c++)
3642 const uschar * addr = recipients_list[c].address;
3643 uschar * msg= US"PRDR R=<%s> %s";
3646 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3647 addr, c+1, recipients_count);
3648 rc = acl_check(ACL_WHERE_PRDR, addr,
3649 acl_smtp_data_prdr, &user_msg, &log_msg);
3651 /* If any recipient rejected content, indicate it in final message */
3653 /* If all recipients rejected, indicate in final message */
3658 case OK: case DISCARD: code = US"250"; break;
3659 case DEFER: code = US"450"; break;
3660 default: code = US"550"; break;
3662 if (user_msg != NULL)
3663 smtp_user_msg(code, user_msg);
3668 case OK: case DISCARD:
3669 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3671 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3673 msg = string_sprintf(CS msg, addr, "refusal"); break;
3675 smtp_user_msg(code, msg);
3677 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3678 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3679 else log_write(0, LOG_MAIN, "%s", CS msg);
3681 if (rc != OK) { receive_remove_recipient(addr); c--; }
3683 /* Set up final message, used if data acl gives OK */
3684 smtp_reply = string_sprintf("%s id=%s message %s",
3685 all_fail == FAIL ? US"550" : US"250",
3688 ? US"rejected for all recipients"
3691 : US"accepted for some recipients");
3692 if (recipients_count == 0)
3696 prdr_requested = FALSE;
3699 prdr_requested = FALSE;
3700 #endif /* !DISABLE_PRDR */
3702 /* Check the recipients count again, as the MIME ACL might have changed
3705 GET_OPTION("acl_smtp_data");
3706 if (acl_smtp_data && recipients_count > 0)
3708 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3709 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3712 recipients_count = 0;
3713 blackholed_by = US"DATA ACL";
3715 blackhole_log_msg = string_sprintf(": %s", log_msg);
3716 cancel_cutthrough_connection(TRUE, US"data acl discard");
3720 Uunlink(spool_name);
3721 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3722 #ifdef WITH_CONTENT_SCAN
3725 #ifdef EXPERIMENTAL_DCC
3728 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3729 smtp_yield = FALSE; /* No more messages after dropped connection */
3730 smtp_reply = US""; /* Indicate reply already sent */
3731 goto NOT_ACCEPTED; /* Skip to end of function */
3736 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3737 we cannot take different actions for permanent and temporary rejections. */
3742 #ifdef WITH_CONTENT_SCAN
3743 GET_OPTION("acl_not_smtp_mime");
3744 if ( acl_not_smtp_mime
3745 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3749 #endif /* WITH_CONTENT_SCAN */
3751 GET_OPTION("acl_not_smtp");
3754 uschar * user_msg, * log_msg;
3755 f.authentication_local = TRUE;
3756 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3759 recipients_count = 0;
3760 blackholed_by = US"non-SMTP ACL";
3762 blackhole_log_msg = string_sprintf(": %s", log_msg);
3766 Uunlink(spool_name);
3767 #ifdef WITH_CONTENT_SCAN
3770 #ifdef EXPERIMENTAL_DCC
3773 /* The ACL can specify where rejections are to be logged, possibly
3774 nowhere. The default is main and reject logs. */
3776 if (log_reject_target)
3777 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3778 sender_address, log_msg);
3780 if (!user_msg) user_msg = US"local configuration problem";
3781 if (smtp_batched_input)
3782 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3783 /* Does not return */
3786 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3787 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3788 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3790 /* Does not return */
3793 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3797 /* The applicable ACLs have been run */
3799 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3800 if (f.queue_only_policy) queued_by = US"ACL";
3803 #ifdef WITH_CONTENT_SCAN
3807 #ifdef EXPERIMENTAL_DCC
3812 #ifdef HAVE_LOCAL_SCAN
3813 /* The final check on the message is to run the scan_local() function. The
3814 version supplied with Exim always accepts, but this is a hook for sysadmins to
3815 supply their own checking code. The local_scan() function is run even when all
3816 the recipients have been discarded. */
3818 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
3820 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3821 deleted, and the incident gets logged. */
3823 if (sigsetjmp(local_scan_env, 1) == 0)
3825 had_local_scan_crash = 0;
3826 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3827 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3828 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3829 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3831 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3832 local_scan_timeout);
3833 local_scan_data = NULL;
3835 had_local_scan_timeout = 0;
3836 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3837 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3838 rc = local_scan(data_fd, &local_scan_data);
3840 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3842 f.enable_dollar_recipients = FALSE;
3844 store_pool = POOL_MAIN; /* In case changed */
3845 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3848 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3849 os_non_restarting_signal(SIGFPE, SIG_DFL);
3850 os_non_restarting_signal(SIGILL, SIG_DFL);
3851 os_non_restarting_signal(SIGBUS, SIG_DFL);
3855 if (had_local_scan_crash)
3857 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3858 "signal %d - message temporarily rejected (size %d)",
3859 had_local_scan_crash, message_size);
3860 receive_bomb_out(US"local-scan-error", US"local verification problem");
3861 /* Does not return */
3863 if (had_local_scan_timeout)
3865 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3866 "message temporarily rejected (size %d)", message_size);
3867 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3868 /* Does not return */
3872 /* The length check is paranoia against some runaway code, and also because
3873 (for a success return) lines in the spool file are read into big_buffer. */
3875 if (local_scan_data)
3877 int len = Ustrlen(local_scan_data);
3878 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3879 local_scan_data = string_copyn(local_scan_data, len);
3882 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3884 if (!f.deliver_freeze) /* ACL might have already frozen */
3886 f.deliver_freeze = TRUE;
3887 deliver_frozen_at = time(NULL);
3888 frozen_by = US"local_scan()";
3890 rc = LOCAL_SCAN_ACCEPT;
3892 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3894 if (!f.queue_only_policy) /* ACL might have already queued */
3896 f.queue_only_policy = TRUE;
3897 queued_by = US"local_scan()";
3899 rc = LOCAL_SCAN_ACCEPT;
3902 /* Message accepted: remove newlines in local_scan_data because otherwise
3903 the spool file gets corrupted. Ensure that all recipients are qualified. */
3905 if (rc == LOCAL_SCAN_ACCEPT)
3907 if (local_scan_data)
3908 for (uschar * s = local_scan_data; *s; s++) if (*s == '\n') *s = ' ';
3909 for (recipient_item * r = recipients_list;
3910 r < recipients_list + recipients_count; r++)
3912 r->address = rewrite_address_qualify(r->address, TRUE);
3914 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3916 if (recipients_count == 0 && !blackholed_by)
3917 blackholed_by = US"local_scan";
3920 /* Message rejected: newlines permitted in local_scan_data to generate
3921 multiline SMTP responses. */
3925 uschar *istemp = US"";
3929 errmsg = local_scan_data;
3931 Uunlink(spool_name); /* Cancel this message */
3935 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3936 "rejection given", rc);
3939 case LOCAL_SCAN_REJECT_NOLOGHDR:
3940 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3943 case LOCAL_SCAN_REJECT:
3944 smtp_code = US"550";
3945 if (!errmsg) errmsg = US"Administrative prohibition";
3948 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3949 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3952 case LOCAL_SCAN_TEMPREJECT:
3954 smtp_code = US"451";
3955 if (!errmsg) errmsg = US"Temporary local problem";
3956 istemp = US"temporarily ";
3960 g = string_append(NULL, 2, US"F=", *sender_address ? sender_address : US"<>");
3961 g = add_host_info_for_log(g);
3963 log_write(0, LOG_MAIN|LOG_REJECT, "%Y %srejected by local_scan(): %.256s",
3964 g, istemp, string_printing(errmsg));
3967 if (!smtp_batched_input)
3969 smtp_respond(smtp_code, 3, SR_FINAL, errmsg);
3970 smtp_reply = US""; /* Indicate reply already sent */
3971 goto NOT_ACCEPTED; /* Skip to end of function */
3974 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3975 /* Does not return */
3978 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3979 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3980 US"message rejected by local scan code: ", error_rc, spool_data_file,
3982 /* Does not return */
3986 /* Reset signal handlers to ignore signals that previously would have caused
3987 the message to be abandoned. */
3989 signal(SIGTERM, SIG_IGN);
3990 signal(SIGINT, SIG_IGN);
3991 #endif /* HAVE_LOCAL_SCAN */
3993 /* If we are faking a reject or defer, avoid sennding a DSN for the
3994 actually-accepted message */
3996 if (fake_response != OK)
3997 for (recipient_item * r = recipients_list;
3998 r < recipients_list + recipients_count; r++)
4000 DEBUG(D_receive) if (r->dsn_flags & (rf_notify_success | rf_notify_delay))
4001 debug_printf("DSN: clearing flags due to fake-response for message\n");
4002 r->dsn_flags = r->dsn_flags & ~(rf_notify_success | rf_notify_delay)
4007 /* Ensure the first time flag is set in the newly-received message. */
4009 f.deliver_firsttime = TRUE;
4011 #ifdef EXPERIMENTAL_BRIGHTMAIL
4013 { /* rewind data file */
4014 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
4015 bmi_verdicts = bmi_process_message(header_list, data_fd);
4019 /* Update the timestamp in our Received: header to account for any time taken by
4020 an ACL or by local_scan(). The new time is the time that all reception
4021 processing is complete. */
4023 timestamp = expand_string(US"${tod_full}");
4024 tslen = Ustrlen(timestamp);
4026 memcpy(received_header->text + received_header->slen - tslen - 1,
4029 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
4033 f.deliver_freeze = FALSE;
4034 f.queue_only_policy = FALSE;
4037 /* Keep the data file open until we have written the header file, in order to
4038 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
4039 don't write the header file, and we unlink the data file. If writing the header
4040 file fails, we have failed to accept this message. */
4042 if (host_checking || blackholed_by)
4044 Uunlink(spool_name);
4045 msg_size = 0; /* Compute size for log line */
4046 for (header_line * h = header_list; h; h = h->next)
4047 if (h->type != '*') msg_size += h->slen;
4050 /* Write the -H file */
4053 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
4055 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
4056 Uunlink(spool_name); /* Lose the data file */
4060 smtp_reply = US"451 Error in writing spool file";
4065 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4066 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4068 /* Does not return */
4073 /* The message has now been successfully received. */
4075 receive_messagecount++;
4077 if ( fflush(spool_data_file)
4078 #if _POSIX_C_SOURCE >= 199309L || _XOPEN_SOURCE >= 500
4079 # ifdef ENABLE_DISABLE_FSYNC
4080 || !disable_fsync && fdatasync(data_fd)
4082 || fdatasync(data_fd)
4087 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
4088 log_write(0, LOG_MAIN, "%s\n", errmsg);
4089 Uunlink(spool_name); /* Lose the data file */
4093 smtp_reply = US"451 Error in writing spool file";
4098 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4099 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4101 /* Does not return */
4105 /* Add data size to written header size. We do not count the initial file name
4106 that is in the file, but we do add one extra for the notional blank line that
4107 precedes the data. This total differs from message_size in that it include the
4108 added Received: header and any other headers that got created locally. */
4110 fstat(data_fd, &statbuf);
4111 msg_size += statbuf.st_size - spool_data_start_offset(message_id) + 1;
4113 /* Generate a "message received" log entry. We do this by building up a dynamic
4114 string as required. We log the arrival of a new message while the
4115 file is still locked, just in case the machine is *really* fast, and delivers
4116 it first! Include any message id that is in the message - since the syntax of a
4117 message id is actually an addr-spec, we can use the parse routine to canonicalize
4120 rcvd_log_reset_point = store_mark();
4121 g = string_get(256);
4123 g = string_append(g, 2,
4124 fake_response == FAIL ? US"(= " : US"<= ",
4125 *sender_address ? sender_address : US"<>");
4126 if (message_reference)
4127 g = string_append(g, 2, US" R=", message_reference);
4129 g = add_host_info_for_log(g);
4132 if (LOGGING(tls_cipher) && tls_in.cipher)
4134 g = string_append(g, 2, US" X=", tls_in.cipher);
4135 # ifndef DISABLE_TLS_RESUME
4136 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4137 g = string_catn(g, US"*", 1);
4140 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4141 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4142 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4143 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4144 if (LOGGING(tls_sni) && tls_in.sni)
4145 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4148 if (sender_host_authenticated)
4150 g = string_append(g, 2, US" A=", sender_host_authenticated);
4151 if (authenticated_id)
4153 g = string_append(g, 2, US":", authenticated_id);
4154 if (LOGGING(smtp_mailauth) && authenticated_sender)
4155 g = string_append(g, 2, US":", authenticated_sender);
4159 #ifndef DISABLE_PRDR
4161 g = string_catn(g, US" PRDR", 5);
4164 #ifdef SUPPORT_PROXY
4165 if (proxy_session && LOGGING(proxy))
4166 g = string_append(g, 2, US" PRX=", proxy_local_address);
4169 if (chunking_state > CHUNKING_OFFERED)
4170 g = string_catn(g, US" K", 2);
4172 g = string_fmt_append(g, " S=%d", msg_size);
4174 /* log 8BITMIME mode announced in MAIL_FROM
4178 if (LOGGING(8bitmime))
4179 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4181 #ifndef DISABLE_DKIM
4182 if (LOGGING(dkim) && dkim_verify_overall)
4183 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4184 # ifdef EXPERIMENTAL_ARC
4185 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4186 g = string_catn(g, US" ARC", 4);
4190 if (LOGGING(receive_time))
4192 struct timeval diff = received_time_complete;
4193 timediff(&diff, &received_time);
4194 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4198 g = string_append(g, 2, US" Q=", queue_name);
4200 /* If an addr-spec in a message-id contains a quoted string, it can contain
4201 any characters except " \ and CR and so in particular it can contain NL!
4202 Therefore, make sure we use a printing-characters only version for the log.
4203 Also, allow for domain literals in the message id. */
4205 if ( LOGGING(msg_id) && msgid_header
4206 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4210 BOOL save_allow_domain_literals = allow_domain_literals;
4211 allow_domain_literals = TRUE;
4212 int start, end, domain;
4214 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4215 &errmsg, &start, &end, &domain, FALSE);
4216 allow_domain_literals = save_allow_domain_literals;
4218 g = string_append(g, 2,
4219 msgid_header_newly_created ? US" id*=" : US" id=",
4220 string_printing(old_id));
4223 /* If subject logging is turned on, create suitable printing-character
4224 text. By expanding $h_subject: we make use of the MIME decoding. */
4226 if (LOGGING(subject) && subject_header)
4228 uschar *p = big_buffer;
4229 uschar *ss = expand_string(US"$h_subject:");
4231 /* Backslash-quote any double quotes or backslashes so as to make a
4232 a C-like string, and turn any non-printers into escape sequences. */
4235 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4237 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4242 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4245 /* Terminate the string: string_cat() and string_append() leave room, but do
4246 not put the zero in. */
4248 (void) string_from_gstring(g);
4250 /* Create a message log file if message logs are being used and this message is
4251 not blackholed. Write the reception stuff to it. We used to leave message log
4252 creation until the first delivery, but this has proved confusing for some
4255 if (message_logs && !blackholed_by)
4258 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4260 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4264 (void)directory_make(spool_directory,
4265 spool_sname(US"msglog", message_subdir),
4266 MSGLOG_DIRECTORY_MODE, TRUE);
4267 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4271 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4272 m_name, strerror(errno));
4275 FILE *message_log = fdopen(fd, "a");
4278 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4279 m_name, strerror(errno));
4284 uschar * now = tod_stamp(tod_log);
4285 /* Drop the initial "<= " */
4286 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4287 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4289 if (f.queue_only_policy) fprintf(message_log,
4290 "%s no immediate delivery: queued%s%s by %s\n", now,
4291 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4293 (void)fclose(message_log);
4298 /* Everything has now been done for a successful message except logging its
4299 arrival, and outputting an SMTP response. While writing to the log, set a flag
4300 to cause a call to receive_bomb_out() if the log cannot be opened. */
4302 f.receive_call_bombout = TRUE;
4304 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4305 connection has gone away. This can only be done if there is no unconsumed input
4306 waiting in the local input buffer. We can test for this by calling
4307 receive_hasc(). RFC 2920 (pipelining) explicitly allows for additional
4308 input to be sent following the final dot, so the presence of following input is
4311 If the connection is still present, but there is no unread input for the
4312 socket, the result of a select() call will be zero. If, however, the connection
4313 has gone away, or if there is pending input, the result of select() will be
4314 non-zero. The two cases can be distinguished by trying to read the next input
4315 character. If we succeed, we can unread it so that it remains in the local
4316 buffer for handling later. If not, the connection has been lost.
4318 Of course, since TCP/IP is asynchronous, there is always a chance that the
4319 connection will vanish between the time of this test and the sending of the
4320 response, but the chance of this happening should be small. */
4322 if ( smtp_input && sender_host_address && !f.sender_host_notsocket
4325 if (poll_one_fd(fileno(smtp_in), POLLIN, 0) != 0)
4327 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4328 if (c != EOF) (receive_ungetc)(c);
4331 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4332 smtp_reply = US""; /* No attempt to send a response */
4333 smtp_yield = FALSE; /* Nothing more on this connection */
4335 /* Re-use the log line workspace */
4338 g = string_cat(g, US"SMTP connection lost after final dot");
4339 g = add_host_info_for_log(g);
4340 log_write(0, LOG_MAIN, "%Y", g);
4342 /* Delete the files for this aborted message. */
4344 Uunlink(spool_name);
4345 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4346 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4353 /* The connection has not gone away; we really are going to take responsibility
4354 for this message. */
4356 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4359 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4360 the sender's dot (below).
4361 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4362 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4363 in which case pass temp-reject back to initiator and dump the files.
4365 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4367 XXX We do not handle queue-only, freezing, or blackholes.
4369 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4371 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4372 /* Logging was done in finaldot() */
4375 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4376 cutthrough_done = ACCEPTED;
4377 break; /* message_id needed for SMTP accept below */
4379 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4380 ... for which, pass back the exact error */
4381 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4382 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4383 break; /* message_id needed for SMTP accept below */
4385 default: /* Unknown response, or error. Treat as temp-reject. */
4386 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4387 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4388 break; /* message_id needed for SMTP accept below */
4390 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4391 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4392 cutthrough_done = PERM_REJ;
4397 #ifndef DISABLE_PRDR
4398 if(!smtp_reply || prdr_requested)
4403 log_write(0, LOG_MAIN |
4404 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4405 (LOGGING(received_sender) ? LOG_SENDER : 0),
4408 /* Log any control actions taken by an ACL or local_scan(). */
4410 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4411 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4412 "no immediate delivery: queued%s%s by %s",
4413 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4416 f.receive_call_bombout = FALSE;
4418 /* The store for the main log message can be reused */
4419 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4421 /* If the message is frozen, and freeze_tell is set, do the telling. */
4423 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4424 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4425 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4426 message_id, frozen_by, sender_address);
4429 /* Either a message has been successfully received and written to the two spool
4430 files, or an error in writing the spool has occurred for an SMTP message, or
4431 an SMTP message has been rejected for policy reasons, or a message was passed on
4432 by cutthrough delivery. (For a non-SMTP message we will have already given up
4433 because there's no point in carrying on!) For non-cutthrough we must now close
4434 (and thereby unlock) the data file. In the successful case, this leaves the
4435 message on the spool, ready for delivery. In the error case, the spool file will
4436 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4439 For cutthrough we hold the data file locked until we have deleted it, otherwise
4440 a queue-runner could grab it in the window.
4442 A fflush() was done earlier in the expectation that any write errors on the
4443 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4444 possible for fclose() to fail - and this has been seen on obscure filesystems
4445 (probably one that delayed the actual media write as long as possible)
4446 but what to do? What has happened to the lock if this happens?
4447 It's a mess because we already logged the acceptance.
4448 We can at least log the issue, try to remove spoolfiles and respond with
4449 a temp-reject. We do not want to close before logging acceptance because
4450 we want to hold the lock until we know that logging worked.
4451 Could we make this less likely by doing an fdatasync() just after the fflush()?
4452 That seems like a good thing on data-security grounds, but how much will it hit
4459 message_id[0] = 0; /* Indicate no message accepted */
4462 process_info[process_info_len] = 0; /* Remove message id */
4463 if (spool_data_file && cutthrough_done == NOT_TRIED)
4465 if (fclose(spool_data_file)) /* Frees the lock */
4467 log_msg = string_sprintf("spoolfile error on close: %s", strerror(errno));
4468 log_write(0, LOG_MAIN|LOG_PANIC |
4469 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4470 (LOGGING(received_sender) ? LOG_SENDER : 0),
4472 log_write(0, LOG_MAIN |
4473 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4474 (LOGGING(received_sender) ? LOG_SENDER : 0),
4475 "rescind the above message-accept");
4477 Uunlink(spool_name);
4478 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4479 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4481 /* Claim a data ACL temp-reject, just to get reject logging and response */
4482 if (smtp_input) smtp_handle_acl_fail(ACL_WHERE_DATA, rc, NULL, log_msg);
4483 smtp_reply = US""; /* Indicate reply already sent */
4485 message_id[0] = 0; /* no message accepted */
4487 spool_data_file = NULL;
4490 /* Now reset signal handlers to their defaults */
4492 signal(SIGTERM, SIG_DFL);
4493 signal(SIGINT, SIG_DFL);
4495 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4496 value, which defaults TRUE - meaning there may be more incoming messages from
4497 this connection. For non-SMTP callers (where there is only ever one message),
4498 the default is FALSE. */
4504 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4505 is set to the response that should be sent. When it is NULL, we generate
4506 default responses. After an ACL error or local_scan() error, the response has
4507 already been sent, and smtp_reply is an empty string to indicate this. */
4509 if (!smtp_batched_input)
4513 if (fake_response != OK)
4514 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4515 3, SR_FINAL, fake_response_text);
4517 /* An OK response is required; use "message" text if present. */
4521 uschar *code = US"250";
4523 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4524 smtp_respond(code, len, SR_FINAL, user_msg);
4527 /* Default OK response */
4529 else if (chunking_state > CHUNKING_OFFERED)
4531 /* If there is more input waiting, no need to flush (probably the client
4532 pipelined QUIT after data). We check only the in-process buffer, not
4535 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4537 chunking_datasize, message_size+message_linecount, message_id);
4538 chunking_state = CHUNKING_OFFERED;
4541 smtp_printf("250 OK id=%s\r\n", receive_hasc(), message_id);
4545 "\n**** SMTP testing: that is not a real message id!\n\n");
4548 /* smtp_reply is set non-empty */
4550 else if (smtp_reply[0] != 0)
4551 if (fake_response != OK && smtp_reply[0] == '2')
4552 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4553 3, SR_FINAL, fake_response_text);
4555 smtp_printf("%.1024s\r\n", SP_NO_MORE, smtp_reply);
4557 switch (cutthrough_done)
4560 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4562 /* Delete spool files */
4563 Uunlink(spool_name);
4564 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4565 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4569 if (cutthrough.defer_pass)
4571 Uunlink(spool_name);
4572 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4573 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4578 if (cutthrough_done != NOT_TRIED)
4580 if (spool_data_file)
4582 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4583 spool_data_file = NULL;
4585 message_id[0] = 0; /* Prevent a delivery from starting */
4586 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4587 cutthrough.defer_pass = FALSE;
4591 /* For batched SMTP, generate an error message on failure, and do
4592 nothing on success. The function moan_smtp_batch() does not return -
4593 it exits from the program with a non-zero return code. */
4595 else if (smtp_reply)
4596 moan_smtp_batch(NULL, "%s", smtp_reply);
4600 /* If blackholing, we can immediately log this message's sad fate. The data
4601 file has already been unlinked, and the header file was never written to disk.
4602 We must now indicate that nothing was received, to prevent a delivery from
4607 const uschar *detail =
4608 #ifdef HAVE_LOCAL_SCAN
4609 local_scan_data ? string_printing(local_scan_data) :
4611 string_sprintf("(%s discarded recipients)", blackholed_by);
4612 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4613 log_write(0, LOG_MAIN, "Completed");
4617 /* Reset headers so that logging of rejects for a subsequent message doesn't
4618 include them. It is also important to set header_last = NULL before exiting
4619 from this function, as this prevents certain rewrites that might happen during
4620 subsequent verifying (of another incoming message) from trying to add headers
4621 when they shouldn't. */
4623 header_list = header_last = NULL;
4625 return yield; /* TRUE if more messages (SMTP only) */
4628 /* End of receive.c */
4629 /* vi: se aw ai sw=2
git://git.exim.org / exim.git / blob