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
20 # include "miscmods/dmarc.h"
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=%s", 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 if (misc_mod_msg_init() != OK)
1841 /* In SMTP sessions we may receive several messages in one connection. Before
1842 each subsequent one, we wait for the clock to tick at the level of message-id
1844 This is so that the combination of time+pid is unique, even on systems where the
1845 pid can be re-used within our time interval. We can't shorten the interval
1846 without re-designing the message-id. See comments above where the message id is
1847 created. This is Something For The Future.
1848 Do this wait any time we have previously created a message-id, even if we
1849 rejected the message. This gives unique IDs for logging done by ACLs.
1850 The initial timestamp must have been obtained via exim_gettime() to avoid
1851 issues on Linux with suspend/resume. */
1853 if (message_id_tv.tv_sec)
1855 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
1856 exim_wait_tick(&message_id_tv, id_resolution);
1859 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1860 ids, and fractions of a second are required. See the comments that precede the
1861 message id creation below.
1862 We use a routine that if possible uses a monotonic clock, and can be used again
1863 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1866 exim_gettime(&message_id_tv);
1868 /* For other uses of the received time we can operate with granularity of one
1869 second, and for that we use the global variable received_time. This is for
1870 things like ultimate message timeouts.
1871 For this we do not care about the Linux suspend/resume problem, so rather than
1872 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1874 gettimeofday(&received_time, NULL);
1876 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1877 happen in the smtp_getc() function when it refills its buffer. */
1879 had_data_timeout = 0;
1881 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1883 /* If not SMTP input, timeout happens only if configured, and we just set a
1884 single timeout for the whole message. */
1886 else if (receive_timeout > 0)
1888 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1889 ALARM(receive_timeout);
1892 /* SIGTERM and SIGINT are caught always. */
1894 had_data_sigint = 0;
1895 signal(SIGTERM, data_sigterm_sigint_handler);
1896 signal(SIGINT, data_sigterm_sigint_handler);
1898 /* Header lines in messages are not supposed to be very long, though when
1899 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1900 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1901 storing the header, and extend this as necessary using string_cat().
1903 To cope with total lunacies, impose an upper limit on the length of the header
1904 section of the message, as otherwise the store will fill up. We must also cope
1905 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1906 Folded header lines are joined into one string, leaving the '\n' characters
1907 inside them, so that writing them out reproduces the input.
1909 Loop for each character of each header; the next structure for chaining the
1910 header is set up already, with ptr the offset of the next character in
1915 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1917 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1918 SMTP must have a correct "." terminator. */
1920 if (smtp_input /* && !smtp_batched_input */)
1923 smtp_reply = handle_lost_connection(US" (header)");
1925 goto TIDYUP; /* Skip to end of function */
1930 /* See if we are at the current header's size limit - there must be at least
1931 four bytes left. This allows for the new character plus a zero, plus two for
1932 extra insertions when we are playing games with dots and carriage returns. If
1933 we are at the limit, extend the text buffer. This could have been done
1934 automatically using string_cat() but because this is a tightish loop storing
1935 only one character at a time, we choose to do it inline. Normally
1936 store_extend() will be able to extend the block; only at the end of a big
1937 store block will a copy be needed. To handle the case of very long headers
1938 (and sometimes lunatic messages can have ones that are 100s of K long) we
1939 call store_release() for strings that have been copied - if the string is at
1940 the start of a block (and therefore the only thing in it, because we aren't
1941 doing any other gets), the block gets freed. We can only do this release if
1942 there were no allocations since the once that we want to free. */
1944 if (ptr >= header_size - 4)
1946 int oldsize = header_size;
1948 if (header_size >= INT_MAX/2)
1952 if (!store_extend(next->text, oldsize, header_size))
1953 next->text = store_newblock(next->text, header_size, ptr);
1956 /* Cope with receiving a binary zero. There is dispute about whether
1957 these should be allowed in RFC 822 messages. The middle view is that they
1958 should not be allowed in headers, at least. Exim takes this attitude at
1959 the moment. We can't just stomp on them here, because we don't know that
1960 this line is a header yet. Set a flag to cause scanning later. */
1962 if (ch == 0) had_zero++;
1964 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1965 those from data files use just LF. Treat LF in local SMTP input as a
1966 terminator too. Treat EOF as a line terminator always. */
1968 if (ch < 0) goto EOL;
1970 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1971 other MTAs accept this. We are therefore forced into this "liberalisation"
1972 too, so we accept LF as a line terminator whatever the source of the message.
1973 However, if the first line of the message ended with a CRLF, we treat a bare
1974 LF specially by inserting a white space after it to ensure that the header
1975 line is not terminated. */
1979 if (first_line_ended_crlf == TRUE_UNSET)
1980 first_line_ended_crlf = FALSE;
1981 else if (first_line_ended_crlf)
1982 receive_ungetc(' ');
1986 /* This is not the end of the line. If this is SMTP input and this is
1987 the first character in the line and it is a "." character, ignore it.
1988 This implements the dot-doubling rule, though header lines starting with
1989 dots aren't exactly common. They are legal in RFC 822, though. If the
1990 following is CRLF or LF, this is the line that that terminates the
1992 entire message. We set message_ended to indicate this has happened (to
1993 prevent further reading), and break out of the loop, having freed the
1994 empty header, and set next = NULL to indicate no data line. */
1996 if (f.dot_ends && ptr == 0 && ch == '.')
1998 /* leading dot while in headers-read mode */
1999 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2000 if (ch == '\n' && first_line_ended_crlf == TRUE /* and not TRUE_UNSET */ )
2001 /* dot, LF but we are in CRLF mode. Attack? */
2002 ch = ' '; /* replace the LF with a space */
2004 else if (ch == '\r')
2006 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2009 if (ch >= 0) receive_ungetc(ch);
2010 ch = '\r'; /* Revert to CR */
2015 message_ended = END_DOT;
2016 reset_point = store_reset(reset_point);
2018 break; /* End character-reading loop */
2021 /* For non-SMTP input, the dot at the start of the line was really a data
2022 character. What is now in ch is the following character. We guaranteed
2023 enough space for this above. */
2027 next->text[ptr++] = '.';
2032 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
2033 remember this case if this is the first line ending. */
2037 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2040 if (first_line_ended_crlf == TRUE_UNSET)
2041 first_line_ended_crlf = TRUE;
2045 /* Otherwise, put back the character after CR, and turn the bare CR
2048 if (ch >= 0) (receive_ungetc)(ch);
2049 next->text[ptr++] = '\n';
2054 /* We have a data character for the header line. */
2056 next->text[ptr++] = ch; /* Add to buffer */
2057 message_size++; /* Total message size so far */
2059 /* Handle failure due to a humungously long header section. The >= allows
2060 for the terminating \n. Add what we have so far onto the headers list so
2061 that it gets reflected in any error message, and back up the just-read
2064 if (message_size >= header_maxsize)
2067 next->text[ptr] = 0;
2069 next->type = htype_other;
2071 header_last->next = next;
2074 log_write(0, LOG_MAIN, "ridiculously long message header received from "
2075 "%s (more than %d characters): message abandoned",
2076 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
2080 smtp_reply = US"552 Message header is ridiculously long";
2081 receive_swallow_smtp();
2082 goto TIDYUP; /* Skip to end of function */
2087 give_local_error(ERRMESS_VLONGHEADER,
2088 string_sprintf("message header longer than %d characters received: "
2089 "message not accepted", header_maxsize), US"", error_rc, stdin,
2091 /* Does not return */
2095 continue; /* With next input character */
2097 /* End of header line reached */
2101 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2103 receive_linecount++;
2104 message_linecount++;
2106 /* Keep track of maximum line length */
2108 if (ptr - prevlines_length > max_received_linelength)
2109 max_received_linelength = ptr - prevlines_length;
2110 prevlines_length = ptr + 1;
2112 /* Now put in the terminating newline. There is always space for
2113 at least two more characters. */
2115 next->text[ptr++] = '\n';
2118 /* A blank line signals the end of the headers; release the unwanted
2119 space and set next to NULL to indicate this. */
2123 reset_point = store_reset(reset_point);
2128 /* There is data in the line; see if the next input character is a
2129 whitespace character. If it is, we have a continuation of this header line.
2130 There is always space for at least one character at this point. */
2134 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2135 if (nextch == ' ' || nextch == '\t')
2137 next->text[ptr++] = nextch;
2138 if (++message_size >= header_maxsize)
2140 continue; /* Iterate the loop */
2142 else if (nextch >= 0) /* not EOF, ERR etc */
2143 (receive_ungetc)(nextch); /* For next time */
2144 else ch = nextch; /* Cause main loop to exit at end */
2147 /* We have got to the real line end. Terminate the string and release store
2148 beyond it. If it turns out to be a real header, internal binary zeros will
2149 be squashed later. */
2151 next->text[ptr] = 0;
2153 store_release_above(next->text + ptr + 1);
2155 /* Check the running total size against the overall message size limit. We
2156 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2157 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2158 headers - the code to read the body will then also hit the buffer. */
2160 if (message_size > thismessage_size_limit) break;
2162 /* A line that is not syntactically correct for a header also marks
2163 the end of the headers. In this case, we leave next containing the
2164 first data line. This might actually be several lines because of the
2165 continuation logic applied above, but that doesn't matter.
2167 It turns out that smail, and presumably sendmail, accept leading lines
2170 From ph10 Fri Jan 5 12:35 GMT 1996
2172 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2173 find any documentation of this, but for compatibility it had better be
2174 accepted. Exim restricts it to the case of non-smtp messages, and
2175 treats it as an alternative to the -f command line option. Thus it is
2176 ignored except for trusted users or filter testing. Otherwise it is taken
2177 as the sender address, unless -f was used (sendmail compatibility).
2179 It further turns out that some UUCPs generate the From_line in a different
2182 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2184 The regex for matching these things is now capable of recognizing both
2185 formats (including 2- and 4-digit years in the latter). In fact, the regex
2186 is now configurable, as is the expansion string to fish out the sender.
2188 Even further on it has been discovered that some broken clients send
2189 these lines in SMTP messages. There is now an option to ignore them from
2190 specified hosts or networks. Sigh. */
2192 if ( header_last == header_list
2194 || ( sender_host_address
2195 && verify_check_host(&ignore_fromline_hosts) == OK
2197 || (!sender_host_address && ignore_fromline_local)
2199 && regex_match_and_setup(regex_From, next->text, 0, -1)
2202 if (!f.sender_address_forced)
2204 uschar * uucp_sender;
2205 GET_OPTION("uucp_from_sender");
2206 if (!(uucp_sender = expand_string(uucp_from_sender)))
2207 log_write(0, LOG_MAIN|LOG_PANIC,
2208 "expansion of \"%s\" failed after matching "
2209 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2212 int start, end, domain;
2214 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2215 &start, &end, &domain, TRUE);
2218 if (domain == 0 && newsender[0] != 0)
2219 /* deconst ok as newsender was not const */
2220 newsender = US rewrite_address_qualify(newsender, FALSE);
2222 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2224 sender_address = newsender;
2226 if (f.trusted_caller || filter_test != FTEST_NONE)
2228 authenticated_sender = NULL;
2229 originator_name = US"";
2230 f.sender_local = FALSE;
2233 if (filter_test != FTEST_NONE)
2234 printf("Sender taken from \"From \" line\n");
2241 /* Not a leading "From " line. Check to see if it is a valid header line.
2242 Header names may contain any non-control characters except space and colon,
2247 uschar * p = next->text;
2249 /* If not a valid header line, break from the header reading loop, leaving
2250 next != NULL, indicating that it holds the first line of the body. */
2252 if (isspace(*p)) break;
2253 while (mac_isgraph(*p) && *p != ':') p++;
2254 if (Uskip_whitespace(&p) != ':')
2256 body_zerocount = had_zero;
2260 /* We have a valid header line. If there were any binary zeroes in
2261 the line, stomp on them here. */
2264 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2267 /* It is perfectly legal to have an empty continuation line
2268 at the end of a header, but it is confusing to humans
2269 looking at such messages, since it looks like a blank line.
2270 Reduce confusion by removing redundant white space at the
2271 end. We know that there is at least one printing character
2272 (the ':' tested for above) so there is no danger of running
2275 p = next->text + ptr - 2;
2278 while (*p == ' ' || *p == '\t') p--;
2279 if (*p != '\n') break;
2280 ptr = (p--) - next->text + 1;
2281 message_size -= next->slen - ptr;
2282 next->text[ptr] = 0;
2286 /* Add the header to the chain */
2288 next->type = htype_other;
2290 header_last->next = next;
2293 /* Check the limit for individual line lengths. This comes after adding to
2294 the chain so that the failing line is reflected if a bounce is generated
2295 (for a local message). */
2297 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2299 log_write(0, LOG_MAIN, "overlong message header line received from "
2300 "%s (more than %d characters): message abandoned",
2301 f.sender_host_unknown ? sender_ident : sender_fullhost,
2302 header_line_maxsize);
2306 smtp_reply = US"552 A message header line is too long";
2307 receive_swallow_smtp();
2308 goto TIDYUP; /* Skip to end of function */
2312 give_local_error(ERRMESS_VLONGHDRLINE,
2313 string_sprintf("message header line longer than %d characters "
2314 "received: message not accepted", header_line_maxsize), US"",
2315 error_rc, stdin, header_list->next);
2316 /* Does not return */
2319 /* Note if any resent- fields exist. */
2321 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2323 resents_exist = TRUE;
2324 resent_prefix = US"Resent-";
2328 /* Reject CHUNKING messages that do not CRLF their first header line */
2330 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2332 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2333 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2335 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2336 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2337 smtp_printf("552 Message header not CRLF terminated\r\n", SP_NO_MORE);
2340 goto TIDYUP; /* Skip to end of function */
2343 /* The line has been handled. If we have hit EOF, break out of the loop,
2344 indicating no pending data line and no more data for the message */
2349 if (ch == EOF) message_ended = END_DOT;
2350 else if (ch == ERR) message_ended = END_PROTOCOL;
2354 /* Set up for the next header */
2356 reset_point = store_mark();
2358 next = store_get(sizeof(header_line), GET_UNTAINTED);
2359 next->text = store_get(header_size, GET_TAINTED);
2362 prevlines_length = 0;
2363 } /* Continue, starting to read the next header */
2365 /* At this point, we have read all the headers into a data structure in main
2366 store. The first header is still the dummy placeholder for the Received: header
2367 we are going to generate a bit later on. If next != NULL, it contains the first
2368 data line - which terminated the headers before reaching a blank line (not the
2373 debug_printf(">>Headers received:\n");
2374 for (header_line * h = header_list->next; h; h = h->next)
2375 debug_printf("%s", h->text);
2379 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2380 is dropped immediately after valid headers, the next thing we will see is EOF.
2381 We must test for this specially, as further down the reading of the data is
2382 skipped if already at EOF.
2383 In CHUNKING mode, a protocol error makes us give up on the message. */
2386 if ((receive_feof)())
2388 smtp_reply = handle_lost_connection(US" (after header)");
2390 goto TIDYUP; /* Skip to end of function */
2392 else if (message_ended == END_PROTOCOL)
2394 smtp_reply = US""; /* no reply needed */
2398 /* If this is a filter test run and no headers were read, output a warning
2399 in case there is a mistake in the test message. */
2401 if (filter_test != FTEST_NONE && header_list->next == NULL)
2402 printf("Warning: no message headers read\n");
2405 /* Scan the headers to identify them. Some are merely marked for later
2406 processing; some are dealt with here. */
2408 for (header_line * h = header_list->next; h; h = h->next)
2410 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2411 if (is_resent) contains_resent_headers = TRUE;
2413 switch (header_checkname(h, is_resent))
2416 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2420 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2423 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2426 if (!resents_exist || is_resent) date_header_exists = TRUE;
2429 /* Same comments as about Return-Path: below. */
2431 case htype_delivery_date:
2432 if (delivery_date_remove) h->type = htype_old;
2435 /* Same comments as about Return-Path: below. */
2437 case htype_envelope_to:
2438 if (envelope_to_remove) h->type = htype_old;
2441 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2442 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2443 header consists of just the login id of the user who called Exim, rewrite
2444 it with the gecos field first. Apply this rule to Resent-From: if there
2445 are resent- fields. */
2448 h->type = htype_from;
2449 #ifdef SUPPORT_DMARC
2450 if (!is_resent) dmarc_from_header = h;
2452 if (!resents_exist || is_resent)
2458 uschar * s = Ustrchr(h->text, ':') + 1;
2460 Uskip_whitespace(&s);
2461 len = h->slen - (s - h->text) - 1;
2462 if (Ustrlen(originator_login) == len &&
2463 strncmpic(s, originator_login, len) == 0)
2465 uschar * name = is_resent ? US"Resent-From" : US"From";
2466 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2467 originator_login, qualify_domain_sender);
2468 from_header = header_last;
2469 h->type = htype_old;
2470 DEBUG(D_receive|D_rewrite)
2471 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2477 /* Identify the Message-id: header for generating "in-reply-to" in the
2478 autoreply transport. For incoming logging, save any resent- value. In both
2479 cases, take just the first of any multiples. */
2482 if (!msgid_header && (!resents_exist || is_resent))
2489 /* Flag all Received: headers */
2491 case htype_received:
2492 h->type = htype_received;
2496 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2498 case htype_reply_to:
2499 h->type = htype_reply_to;
2502 /* The Return-path: header is supposed to be added to messages when
2503 they leave the SMTP system. We shouldn't receive messages that already
2504 contain Return-path. However, since Exim generates Return-path: on
2505 local delivery, resent messages may well contain it. We therefore
2506 provide an option (which defaults on) to remove any Return-path: headers
2507 on input. Removal actually means flagging as "old", which prevents the
2508 header being transmitted with the message. */
2510 case htype_return_path:
2511 if (return_path_remove) h->type = htype_old;
2513 /* If we are testing a mail filter file, use the value of the
2514 Return-Path: header to set up the return_path variable, which is not
2515 otherwise set. However, remove any <> that surround the address
2516 because the variable doesn't have these. */
2518 if (filter_test != FTEST_NONE)
2520 uschar * start = h->text + 12;
2521 uschar * end = start + Ustrlen(start);
2523 Uskip_whitespace(&start);
2524 while (end > start && isspace(end[-1])) end--;
2525 if (*start == '<' && end[-1] == '>')
2527 return_path = string_copyn(start, end - start);
2528 printf("Return-path taken from \"Return-path:\" header line\n");
2532 /* If there is a "Sender:" header and the message is locally originated,
2533 and from an untrusted caller and suppress_local_fixups is not set, or if we
2534 are in submission mode for a remote message, mark it "old" so that it will
2535 not be transmitted with the message, unless active_local_sender_retain is
2536 set. (This can only be true if active_local_from_check is false.) If there
2537 are any resent- headers in the message, apply this rule to Resent-Sender:
2538 instead of Sender:. Messages with multiple resent- header sets cannot be
2539 tidily handled. (For this reason, at least one MUA - Pine - turns old
2540 resent- headers into X-resent- headers when resending, leaving just one
2544 h->type = !f.active_local_sender_retain
2545 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2546 || f.submission_mode
2548 && (!resents_exist || is_resent)
2549 ? htype_old : htype_sender;
2552 /* Remember the Subject: header for logging. There is no Resent-Subject */
2558 /* "To:" gets flagged, and the existence of a recipient header is noted,
2559 whether it's resent- or not. */
2564 to_or_cc_header_exists = TRUE;
2570 /* Extract recipients from the headers if that is required (the -t option).
2571 Note that this is documented as being done *before* any address rewriting takes
2572 place. There are two possibilities:
2574 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2575 recipients already listed are to be REMOVED from the message. Smail 3 works
2576 like this. We need to build a non-recipients tree for that list, because in
2577 subsequent processing this data is held in a tree and that's what the
2578 spool_write_header() function expects. Make sure that non-recipient addresses
2579 are fully qualified and rewritten if necessary.
2581 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2582 those in the command line arguments (and it is rumoured some other MTAs do
2583 this). Therefore, there is an option to make Exim behave this way.
2585 *** Notes on "Resent-" header lines ***
2587 The presence of resent-headers in the message makes -t horribly ambiguous.
2588 Experiments with sendmail showed that it uses recipients for all resent-
2589 headers, totally ignoring the concept of "sets of resent- headers" as described
2590 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2591 with all the addresses in one instance of each header.
2593 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2594 error for -t if there were resent- headers in the message. However, after a
2595 discussion on the mailing list, I've learned that there are MUAs that use
2596 resent- headers with -t, and also that the stuff about sets of resent- headers
2597 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2598 message with -t and resent- header lines makes sure that only *its* resent-
2599 headers are present; previous ones are often renamed as X-resent- for example.
2601 Consequently, Exim has been changed so that, if any resent- header lines are
2602 present, the recipients are taken from all of the appropriate resent- lines,
2603 and not from the ordinary To:, Cc:, etc. */
2608 error_block **bnext = &bad_addresses;
2610 if (extract_addresses_remove_arguments)
2612 while (recipients_count-- > 0)
2614 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2615 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2616 tree_add_nonrecipient(s);
2618 recipients_list = NULL;
2619 recipients_count = recipients_list_max = 0;
2622 /* Now scan the headers */
2624 for (header_line * h = header_list->next; h; h = h->next)
2626 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2627 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2629 uschar * s = Ustrchr(h->text, ':') + 1;
2630 Uskip_whitespace(&s);
2632 f.parse_allow_group = TRUE; /* Allow address group syntax */
2636 uschar *ss = parse_find_address_end(s, FALSE);
2637 uschar *recipient, *errmess, *pp;
2638 int start, end, domain;
2640 /* Check on maximum */
2642 if (recipients_max_expanded > 0 && ++rcount > recipients_max_expanded)
2643 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2644 US"message rejected: ", error_rc, stdin, NULL);
2645 /* Does not return */
2647 /* Make a copy of the address, and remove any internal newlines. These
2648 may be present as a result of continuations of the header line. The
2649 white space that follows the newline must not be removed - it is part
2652 pp = recipient = store_get(ss - s + 1, s);
2653 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2658 BOOL b = allow_utf8_domains;
2659 allow_utf8_domains = TRUE;
2661 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2666 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2667 else allow_utf8_domains = b;
2673 /* Keep a list of all the bad addresses so we can send a single
2674 error message at the end. However, an empty address is not an error;
2675 just ignore it. This can come from an empty group list like
2677 To: Recipients of list:;
2679 If there are no recipients at all, an error will occur later. */
2681 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2683 int len = Ustrlen(s);
2684 error_block * b = store_get(sizeof(error_block), GET_UNTAINTED);
2685 while (len > 0 && isspace(s[len-1])) len--;
2687 b->text1 = string_printing(string_copyn(s, len));
2693 /* If the recipient is already in the nonrecipients tree, it must
2694 have appeared on the command line with the option extract_addresses_
2695 remove_arguments set. Do not add it to the recipients, and keep a note
2696 that this has happened, in order to give a better error if there are
2697 no recipients left. */
2701 if (tree_search(tree_nonrecipients, recipient) == NULL)
2702 receive_add_recipient(recipient, -1);
2704 extracted_ignored = TRUE;
2707 /* Move on past this address */
2709 s = ss + (*ss ? 1 : 0);
2710 Uskip_whitespace(&s);
2711 } /* Next address */
2713 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2714 f.parse_found_group = FALSE;
2716 /* If this was the bcc: header, mark it "old", which means it
2717 will be kept on the spool, but not transmitted as part of the
2720 if (h->type == htype_bcc) h->type = htype_old;
2721 } /* For appropriate header line */
2722 } /* For each header line */
2726 /* Now build the unique message id. This has changed several times over the
2727 lifetime of Exim, and is changing for Exim 4.97.
2728 The previous change was in about 2003.
2730 Detail for the pre-4.97 version is here in [square-brackets].
2732 The message ID has 3 parts: tttttt-ppppppppppp-ssss (6, 11, 4 - total 23 with
2733 the dashes). Each part is a number in base 62.
2734 [ tttttt-pppppp-ss 6, 6, 2 => 16 ]
2736 The first part is the current time, in seconds. Six chars is enough until
2737 year 3700 with case-sensitive filesystes, but will run out in 2038 on
2738 case-insensitive ones (Cygwin, Darwin - where we have to use base-36.
2739 Both of those are in the "unsupported" bucket, so ignore for now).
2741 The second part is the current pid, and supports 64b [31b] PIDs.
2743 The third part holds sub-second time, plus (when localhost_number is set)
2744 the host number multiplied by a number large enough to keep it away from
2745 the time portion. Host numbers are restricted to the range 0-16.
2746 The time resolution is variously 1, 2 or 4 microseconds [0.5 or 1 ms]
2747 depending on the use of localhost_nubmer and of case-insensitive filesystems.
2749 After a message has been received, Exim ensures that the timer has ticked at the
2750 appropriate level before proceeding, to avoid duplication if the pid happened to
2751 be re-used within the same time period. It seems likely that most messages will
2752 take at least half a millisecond to be received, so no delay will normally be
2753 necessary. At least for some time...
2755 Note that string_base62_XX() returns its data in a static storage block, so it
2756 must be copied before calling string_base62_XXX) again. It always returns exactly
2757 11 (_64) or 6 (_32) characters.
2759 There doesn't seem to be anything in the RFC which requires a message id to
2760 start with a letter, but Smail was changed to ensure this. The external form of
2761 the message id (as supplied by string expansion) therefore starts with an
2762 additional leading 'E'. The spool file names do not include this leading
2763 letter and it is not used internally.
2765 NOTE: If ever the format of message ids is changed, the regular expression for
2766 checking that a string is in this format must be updated in a corresponding
2767 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2768 must also be changed to reflect the correct string length. The queue-sort code
2769 needs to know the layout. Then, of course, other programs that rely on the
2770 message id format will need updating too (inc. at least exim_msgdate). */
2772 Ustrncpy(message_id, string_base62_32((long int)(message_id_tv.tv_sec)), MESSAGE_ID_TIME_LEN);
2773 message_id[MESSAGE_ID_TIME_LEN] = '-';
2774 Ustrncpy(message_id + MESSAGE_ID_TIME_LEN + 1,
2775 string_base62_64((long int)getpid()),
2779 /* Deal with the case where the host number is set. The value of the number was
2780 checked when it was read, to ensure it isn't too big. */
2782 if (host_number_string)
2783 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2784 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2785 string_base62_32((long int)(
2786 host_number * (1000000/id_resolution)
2787 + message_id_tv.tv_usec/id_resolution))
2788 + (6 - MESSAGE_ID_SUBTIME_LEN)
2791 /* Host number not set: final field is just the fractional time at an
2792 appropriate resolution. */
2795 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2796 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2797 string_base62_32((long int)(message_id_tv.tv_usec/id_resolution))
2798 + (6 - MESSAGE_ID_SUBTIME_LEN));
2800 /* Add the current message id onto the current process info string if
2803 (void)string_format(process_info + process_info_len,
2804 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2806 /* If we are using multiple input directories, set up the one for this message
2807 to be the least significant base-62 digit of the time of arrival. Otherwise
2808 ensure that it is an empty string. */
2810 set_subdir_str(message_subdir, message_id, 0);
2812 /* Now that we have the message-id, if there is no message-id: header, generate
2813 one, but only for local (without suppress_local_fixups) or submission mode
2814 messages. This can be user-configured if required, but we had better flatten
2815 any illegal characters therein. */
2818 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2820 uschar *id_text = US"";
2821 uschar *id_domain = primary_hostname;
2824 /* Permit only letters, digits, dots, and hyphens in the domain */
2826 GET_OPTION("message_id_header_domain");
2827 if (message_id_domain)
2829 uschar *new_id_domain = expand_string(message_id_domain);
2832 if (!f.expand_string_forcedfail)
2833 log_write(0, LOG_MAIN|LOG_PANIC,
2834 "expansion of \"%s\" (message_id_header_domain) "
2835 "failed: %s", message_id_domain, expand_string_message);
2837 else if (*new_id_domain)
2839 id_domain = new_id_domain;
2840 for (uschar * p = id_domain; *p; p++)
2841 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2845 /* Permit all characters except controls and RFC 2822 specials in the
2846 additional text part. */
2848 GET_OPTION("message_id_header_text");
2849 if (message_id_text)
2851 uschar *new_id_text = expand_string(message_id_text);
2854 if (!f.expand_string_forcedfail)
2855 log_write(0, LOG_MAIN|LOG_PANIC,
2856 "expansion of \"%s\" (message_id_header_text) "
2857 "failed: %s", message_id_text, expand_string_message);
2859 else if (*new_id_text)
2861 id_text = new_id_text;
2862 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2866 /* Add the header line.
2867 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2868 appended, to preserve classical expectations of header ordering. */
2870 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2871 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2872 *id_text == 0 ? "" : ".", id_text, id_domain);
2874 /* Arrange for newly-created Message-Id to be logged */
2878 msgid_header_newly_created = TRUE;
2883 /* If we are to log recipients, keep a copy of the raw ones before any possible
2884 rewriting. Must copy the count, because later ACLs and the local_scan()
2885 function may mess with the real recipients. */
2887 if (LOGGING(received_recipients))
2889 raw_recipients = store_get(recipients_count * sizeof(uschar *), GET_UNTAINTED);
2890 for (int i = 0; i < recipients_count; i++)
2891 raw_recipients[i] = string_copy(recipients_list[i].address);
2892 raw_recipients_count = recipients_count;
2895 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2896 recipients will get here only if the conditions were right (allow_unqualified_
2897 recipient is TRUE). */
2900 { debug_printf_indent("qualify & rewrite recipients list\n"); acl_level++; }
2901 for (int i = 0; i < recipients_count; i++)
2902 recipients_list[i].address = /* deconst ok as src was not cont */
2903 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2904 global_rewrite_rules, rewrite_existflags);
2905 DEBUG(D_rewrite) acl_level--;
2907 /* If there is no From: header, generate one for local (without
2908 suppress_local_fixups) or submission_mode messages. If there is no sender
2909 address, but the sender is local or this is a local delivery error, use the
2910 originator login. This shouldn't happen for genuine bounces, but might happen
2911 for autoreplies. The addition of From: must be done *before* checking for the
2912 possible addition of a Sender: header, because untrusted_set_sender allows an
2913 untrusted user to set anything in the envelope (which might then get info
2914 From:) but we still want to ensure a valid Sender: if it is required. */
2917 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2919 const uschar * oname = US"";
2921 /* Use the originator_name if this is a locally submitted message and the
2922 caller is not trusted. For trusted callers, use it only if -F was used to
2923 force its value or if we have a non-SMTP message for which -f was not used
2924 to set the sender. */
2926 if (!sender_host_address)
2928 if (!f.trusted_caller || f.sender_name_forced ||
2929 (!smtp_input && !f.sender_address_forced))
2930 oname = originator_name;
2933 /* For non-locally submitted messages, the only time we use the originator
2934 name is when it was forced by the /name= option on control=submission. */
2936 else if (submission_name) oname = submission_name;
2938 /* Envelope sender is empty */
2940 if (!*sender_address)
2942 uschar *fromstart, *fromend;
2944 fromstart = string_sprintf("%sFrom: %s%s",
2945 resent_prefix, oname, *oname ? " <" : "");
2946 fromend = *oname ? US">" : US"";
2948 if (f.sender_local || f.local_error_message)
2949 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2950 local_part_quote(originator_login), qualify_domain_sender,
2953 else if (f.submission_mode && authenticated_id)
2955 if (!submission_domain)
2956 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2957 local_part_quote(authenticated_id), qualify_domain_sender,
2960 else if (!*submission_domain) /* empty => whole address set */
2961 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2965 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2966 local_part_quote(authenticated_id), submission_domain, fromend);
2968 from_header = header_last; /* To get it checked for Sender: */
2972 /* There is a non-null envelope sender. Build the header using the original
2973 sender address, before any rewriting that might have been done while
2978 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2981 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2984 from_header = header_last; /* To get it checked for Sender: */
2989 /* If the sender is local (without suppress_local_fixups), or if we are in
2990 submission mode and there is an authenticated_id, check that an existing From:
2991 is correct, and if not, generate a Sender: header, unless disabled. Any
2992 previously-existing Sender: header was removed above. Note that sender_local,
2993 as well as being TRUE if the caller of exim is not trusted, is also true if a
2994 trusted caller did not supply a -f argument for non-smtp input. To allow
2995 trusted callers to forge From: without supplying -f, we have to test explicitly
2996 here. If the From: header contains more than one address, then the call to
2997 parse_extract_address fails, and a Sender: header is inserted, as required. */
3000 && ( f.active_local_from_check
3001 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
3002 || f.submission_mode && authenticated_id
3005 BOOL make_sender = TRUE;
3006 int start, end, domain;
3008 uschar *from_address =
3009 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
3010 &start, &end, &domain, FALSE);
3011 uschar *generated_sender_address;
3013 generated_sender_address = f.submission_mode
3014 ? !submission_domain
3015 ? string_sprintf("%s@%s",
3016 local_part_quote(authenticated_id), qualify_domain_sender)
3017 : !*submission_domain /* empty => full address */
3018 ? string_sprintf("%s", authenticated_id)
3019 : string_sprintf("%s@%s",
3020 local_part_quote(authenticated_id), submission_domain)
3021 : string_sprintf("%s@%s",
3022 local_part_quote(originator_login), qualify_domain_sender);
3024 /* Remove permitted prefixes and suffixes from the local part of the From:
3025 address before doing the comparison with the generated sender. */
3030 uschar *at = domain ? from_address + domain - 1 : NULL;
3033 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
3034 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
3036 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
3037 from_address += slen;
3041 if ( strcmpic(generated_sender_address, from_address) == 0
3042 || (!domain && strcmpic(from_address, originator_login) == 0))
3043 make_sender = FALSE;
3046 /* We have to cause the Sender header to be rewritten if there are
3047 appropriate rewriting rules. */
3050 if (f.submission_mode && !submission_name)
3051 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
3052 generated_sender_address);
3054 header_add(htype_sender, "%sSender: %s <%s>\n",
3056 f.submission_mode ? submission_name : originator_name,
3057 generated_sender_address);
3059 /* Ensure that a non-null envelope sender address corresponds to the
3060 submission mode sender address. */
3062 if (f.submission_mode && *sender_address)
3064 if (!sender_address_unrewritten)
3065 sender_address_unrewritten = sender_address;
3066 sender_address = generated_sender_address;
3067 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
3068 log_write(L_address_rewrite, LOG_MAIN,
3069 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
3070 sender_address_unrewritten, generated_sender_address);
3074 /* If there are any rewriting rules, apply them to the sender address, unless
3075 it has already been rewritten as part of verification for SMTP input. */
3078 { debug_printf("rewrite rules on sender address\n"); acl_level++; }
3079 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
3081 /* deconst ok as src was not const */
3082 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
3083 global_rewrite_rules, rewrite_existflags);
3084 DEBUG(D_receive|D_rewrite)
3085 debug_printf("rewritten sender = %s\n", sender_address);
3087 DEBUG(D_rewrite) acl_level--;
3090 /* The headers must be run through rewrite_header(), because it ensures that
3091 addresses are fully qualified, as well as applying any rewriting rules that may
3094 Qualification of header addresses in a message from a remote host happens only
3095 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
3096 appropriate. For local messages, qualification always happens, unless -bnq is
3097 used to explicitly suppress it. No rewriting is done for an unqualified address
3098 that is left untouched.
3100 We start at the second header, skipping our own Received:. This rewriting is
3101 documented as happening *after* recipient addresses are taken from the headers
3102 by the -t command line option. An added Sender: gets rewritten here. */
3105 { debug_printf("qualify and rewrite headers\n"); acl_level++; }
3106 for (header_line * h = header_list->next, * newh; h; h = h->next)
3107 if ((newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3108 rewrite_existflags, TRUE)))
3110 DEBUG(D_rewrite) acl_level--;
3113 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3114 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3115 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3116 exists, this applies to the set of resent- headers rather than the normal set.
3118 The requirement for a recipient header has been removed in RFC 2822. At this
3119 point in the code, earlier versions of Exim added a To: header for locally
3120 submitted messages, and an empty Bcc: header for others. In the light of the
3121 changes in RFC 2822, this was dropped in November 2003. */
3124 /* If there is no date header, generate one if the message originates locally
3125 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3126 submission mode flag is set. Messages without Date: are not valid, but it seems
3127 to be more confusing if Exim adds one to all remotely-originated messages.
3128 As per Message-Id, we prepend if resending, else append.
3131 if ( !date_header_exists
3132 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3133 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3134 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3136 search_tidyup(); /* Free any cached resources */
3138 /* Show the complete set of headers if debugging. Note that the first one (the
3139 new Received:) has not yet been set. */
3143 debug_printf(">>Headers after rewriting and local additions:\n");
3145 for (header_line * h = header_list->next; h; h = h->next)
3146 debug_printf_indent("%c %s", h->type, h->text);
3151 /* The headers are now complete in store. If we are running in filter
3152 testing mode, that is all this function does. Return TRUE if the message
3153 ended with a dot. */
3155 if (filter_test != FTEST_NONE)
3157 process_info[process_info_len] = 0;
3158 return message_ended == END_DOT;
3161 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3162 think more if it could be handled. Cannot do onward CHUNKING unless
3163 inbound is, but inbound chunking ought to be ok with outbound plain.
3164 Could we do onward CHUNKING given inbound CHUNKING?
3166 if (chunking_state > CHUNKING_OFFERED)
3167 cancel_cutthrough_connection(FALSE, US"chunking active");
3169 /* Cutthrough delivery:
3170 We have to create the Received header now rather than at the end of reception,
3171 so the timestamp behaviour is a change to the normal case.
3172 Having created it, send the headers to the destination. */
3174 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3176 if (received_count > received_headers_max)
3178 cancel_cutthrough_connection(TRUE, US"too many headers");
3179 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3180 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3181 "Too many \"Received\" headers",
3183 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3184 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3185 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3186 goto NOT_ACCEPTED; /* Skip to end of function */
3188 received_header_gen();
3189 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3190 (void) cutthrough_headers_send();
3194 /* Open a new spool file for the data portion of the message. We need
3195 to access it both via a file descriptor and a stdio stream. Try to make the
3196 directory if it isn't there. */
3198 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3199 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3201 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3203 if (errno == ENOENT)
3205 (void) directory_make(spool_directory,
3206 spool_sname(US"input", message_subdir),
3207 INPUT_DIRECTORY_MODE, TRUE);
3208 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3211 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3212 spool_name, strerror(errno));
3215 /* Make sure the file's group is the Exim gid, and double-check the mode
3216 because the group setting doesn't always get set automatically. */
3218 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3219 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3220 "Failed setting ownership on spool file %s: %s",
3221 spool_name, strerror(errno));
3222 (void)fchmod(data_fd, SPOOL_MODE);
3224 /* We now have data file open. Build a stream for it and lock it. We lock only
3225 the first line of the file (containing the message ID) because otherwise there
3226 are problems when Exim is run under Cygwin (I'm told). See comments in
3227 spool_in.c, where the same locking is done. */
3229 spool_data_file = fdopen(data_fd, "w+");
3230 lock_data.l_type = F_WRLCK;
3231 lock_data.l_whence = SEEK_SET;
3232 lock_data.l_start = 0;
3233 lock_data.l_len = spool_data_start_offset(message_id);
3235 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3236 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3237 errno, strerror(errno));
3239 /* We have an open, locked data file. Write the message id to it to make it
3240 self-identifying. Then read the remainder of the input of this message and
3241 write it to the data file. If the variable next != NULL, it contains the first
3242 data line (which was read as a header but then turned out not to have the right
3243 format); write it (remembering that it might contain binary zeros). The result
3244 of fwrite() isn't inspected; instead we call ferror() below. */
3246 fprintf(spool_data_file, "%s-D\n", message_id);
3249 uschar *s = next->text;
3250 int len = next->slen;
3251 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3252 body_linecount++; /* Assumes only 1 line */
3255 /* Note that we might already be at end of file, or the logical end of file
3256 (indicated by '.'), or might have encountered an error while writing the
3257 message id or "next" line. */
3259 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3263 message_ended = chunking_state <= CHUNKING_OFFERED
3264 ? read_message_data_smtp(spool_data_file, first_line_ended_crlf)
3266 ? read_message_bdat_smtp_wire(spool_data_file)
3267 : read_message_bdat_smtp(spool_data_file);
3268 receive_linecount++; /* The terminating "." line */
3271 message_ended = read_message_data(spool_data_file);
3273 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3274 message_linecount += body_linecount;
3276 switch (message_ended)
3278 /* Handle premature termination of SMTP */
3283 Uunlink(spool_name); /* Lose data file when closed */
3284 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3285 smtp_reply = handle_lost_connection(US"");
3287 goto NOT_ACCEPTED; /* Skip to end of function */
3291 /* Handle message that is too big. Don't use host_or_ident() in the log
3292 message; we want to see the ident value even for non-remote messages. */
3295 Uunlink(spool_name); /* Lose the data file when closed */
3296 cancel_cutthrough_connection(TRUE, US"mail too big");
3297 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3299 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3300 "message too big: read=%d max=%d",
3302 sender_fullhost ? " H=" : "",
3303 sender_fullhost ? sender_fullhost : US"",
3304 sender_ident ? " U=" : "",
3305 sender_ident ? sender_ident : US"",
3307 thismessage_size_limit);
3311 smtp_reply = US"552 Message size exceeds maximum permitted";
3312 goto NOT_ACCEPTED; /* Skip to end of function */
3316 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3317 give_local_error(ERRMESS_TOOBIG,
3318 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3319 US"message rejected: ", error_rc, spool_data_file, header_list);
3320 /* Does not return */
3324 /* Handle bad BDAT protocol sequence */
3327 Uunlink(spool_name); /* Lose the data file when closed */
3328 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3329 smtp_reply = US""; /* Response already sent */
3330 goto NOT_ACCEPTED; /* Skip to end of function */
3334 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3335 example, there may be some expansion in an ACL that uses a timer.) */
3337 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3339 /* The message body has now been read into the data file. Call fflush() to
3340 empty the buffers in C, and then call fsync() to get the data written out onto
3341 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3342 having to do this). If there was an I/O error on either input or output,
3343 attempt to send an error message, and unlink the spool file. For non-SMTP input
3344 we can then give up. Note that for SMTP input we must swallow the remainder of
3345 the input in cases of output errors, since the far end doesn't expect to see
3346 anything until the terminating dot line is sent. */
3348 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3349 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3351 uschar *msg_errno = US strerror(errno);
3352 BOOL input_error = (receive_ferror)() != 0;
3353 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3354 input_error? "Input read" : "Spool write",
3356 sender_fullhost ? sender_fullhost : sender_ident);
3358 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3359 Uunlink(spool_name); /* Lose the data file */
3360 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3365 smtp_reply = US"451 Error while reading input data";
3368 smtp_reply = US"451 Error while writing spool file";
3369 receive_swallow_smtp();
3371 goto NOT_ACCEPTED; /* Skip to end of function */
3376 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3377 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3379 /* Does not return */
3384 /* No I/O errors were encountered while writing the data file. */
3386 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3387 gettimeofday(&received_time_complete, NULL);
3390 /* If there were any bad addresses extracted by -t, or there were no recipients
3391 left after -t, send a message to the sender of this message, or write it to
3392 stderr if the error handling option is set that way. Note that there may
3393 legitimately be no recipients for an SMTP message if they have all been removed
3396 We need to rewind the data file in order to read it. In the case of no
3397 recipients or stderr error writing, throw the data file away afterwards, and
3398 exit. (This can't be SMTP, which always ensures there's at least one
3399 syntactically good recipient address.) */
3401 if (extract_recip && (bad_addresses || recipients_count == 0))
3405 if (recipients_count == 0) debug_printf("*** No recipients\n");
3408 debug_printf("*** Bad address(es)\n");
3409 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3410 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3414 log_write(0, LOG_MAIN|LOG_PANIC, "%s found in headers",
3415 bad_addresses ? "bad addresses" : "no recipients");
3417 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3419 /* If configured to send errors to the sender, but this fails, force
3420 a failure error code. We use a special one for no recipients so that it
3421 can be detected by the autoreply transport. Otherwise error_rc is set to
3422 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3423 it is EXIT_SUCCESS. */
3425 if (error_handling == ERRORS_SENDER)
3427 if (!moan_to_sender(
3429 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3430 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3431 bad_addresses, header_list, spool_data_file, FALSE
3433 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3438 if (extracted_ignored)
3439 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3441 fprintf(stderr, "exim: no recipients in message\n");
3444 fprintf(stderr, "exim: invalid address%s",
3445 bad_addresses->next ? "es:\n" : ":");
3446 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3447 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3448 bad_addresses->text2);
3452 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3454 Uunlink(spool_name);
3455 (void)fclose(spool_data_file);
3456 exim_exit(error_rc);
3460 /* Data file successfully written. Generate text for the Received: header by
3461 expanding the configured string, and adding a timestamp. By leaving this
3462 operation till now, we ensure that the timestamp is the time that message
3463 reception was completed. However, this is deliberately done before calling the
3464 data ACL and local_scan().
3466 This Received: header may therefore be inspected by the data ACL and by code in
3467 the local_scan() function. When they have run, we update the timestamp to be
3468 the final time of reception.
3470 If there is just one recipient, set up its value in the $received_for variable
3471 for use when we generate the Received: header.
3473 Note: the checking for too many Received: headers is handled by the delivery
3475 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3477 if (!received_header->text) /* Non-cutthrough case */
3479 received_header_gen();
3481 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3483 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3484 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3486 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3487 now, before running the DATA ACL. */
3489 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3492 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3493 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3495 /* If an ACL is specified for checking things at this stage of reception of a
3496 message, run it, unless all the recipients were removed by "discard" in earlier
3497 ACLs. That is the only case in which recipients_count can be zero at this
3498 stage. Set deliver_datafile to point to the data file so that $message_body and
3499 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3502 deliver_datafile = data_fd;
3505 f.enable_dollar_recipients = TRUE;
3507 if (recipients_count == 0)
3508 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3512 /* Handle interactive SMTP messages */
3514 if (smtp_input && !smtp_batched_input)
3517 #ifndef DISABLE_DKIM
3518 if (!f.dkim_disable_verify)
3520 /* Finish off the body hashes, calculate sigs and do compares */
3521 dkim_exim_verify_finish();
3523 /* Check if we must run the DKIM ACL */
3524 GET_OPTION("acl_smtp_dkim");
3525 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3527 uschar * dkim_verify_signers_expanded =
3528 expand_string(dkim_verify_signers);
3529 gstring * results = NULL, * seen_items = NULL;
3530 int signer_sep = 0, old_pool = store_pool;
3534 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3536 if (!(ptr = dkim_verify_signers_expanded))
3537 log_write(0, LOG_MAIN|LOG_PANIC,
3538 "expansion of dkim_verify_signers option failed: %s",
3539 expand_string_message);
3541 /* Loop over signers we want to verify, calling ACL. Default to OK
3542 when no signers are present. Each call from here expands to a n ACL
3543 call per matching sig in the message. */
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 if (dkim_verify_minimal && Ustrcmp(dkim_verify_status, "pass") == 0)
3593 dkim_verify_status = string_from_gstring(results);
3594 store_pool = old_pool;
3595 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3598 recipients_count = 0;
3599 blackholed_by = US"DKIM ACL";
3601 blackhole_log_msg = string_sprintf(": %s", log_msg);
3605 Uunlink(spool_name);
3606 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3607 smtp_yield = FALSE; /* No more messages after dropped connection */
3608 smtp_reply = US""; /* Indicate reply already sent */
3609 goto NOT_ACCEPTED; /* Skip to end of function */
3612 else /* No acl or no wanted signers */
3613 dkim_exim_verify_log_all();
3615 #endif /* DISABLE_DKIM */
3617 #ifdef WITH_CONTENT_SCAN
3618 if (recipients_count > 0)
3620 GET_OPTION("acl_smtp_mime");
3622 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3626 #endif /* WITH_CONTENT_SCAN */
3628 #ifdef SUPPORT_DMARC
3630 misc_module_info * mi = misc_mod_findonly(US"dmarc");
3633 typedef int (*fn_t)(header_line *);
3634 (((fn_t *) mi->functions)[3]) (dmarc_from_header);
3639 #ifndef DISABLE_PRDR
3640 if (prdr_requested && recipients_count > 1)
3642 GET_OPTION("acl_smtp_data_prdr");
3643 if (acl_smtp_data_prdr)
3646 int all_fail = FAIL;
3648 smtp_printf("353 PRDR content analysis beginning\r\n", SP_MORE);
3649 /* Loop through recipients, responses must be in same order received */
3650 for (unsigned int c = 0; recipients_count > c; c++)
3652 const uschar * addr = recipients_list[c].address;
3653 uschar * msg= US"PRDR R=<%s> %s";
3656 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3657 addr, c+1, recipients_count);
3658 rc = acl_check(ACL_WHERE_PRDR, addr,
3659 acl_smtp_data_prdr, &user_msg, &log_msg);
3661 /* If any recipient rejected content, indicate it in final message */
3663 /* If all recipients rejected, indicate in final message */
3668 case OK: case DISCARD: code = US"250"; break;
3669 case DEFER: code = US"450"; break;
3670 default: code = US"550"; break;
3672 if (user_msg != NULL)
3673 smtp_user_msg(code, user_msg);
3678 case OK: case DISCARD:
3679 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3681 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3683 msg = string_sprintf(CS msg, addr, "refusal"); break;
3685 smtp_user_msg(code, msg);
3687 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3688 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3689 else log_write(0, LOG_MAIN, "%s", CS msg);
3691 if (rc != OK) { receive_remove_recipient(addr); c--; }
3693 /* Set up final message, used if data acl gives OK */
3694 smtp_reply = string_sprintf("%s id=%s message %s",
3695 all_fail == FAIL ? US"550" : US"250",
3698 ? US"rejected for all recipients"
3701 : US"accepted for some recipients");
3702 if (recipients_count == 0)
3706 prdr_requested = FALSE;
3709 prdr_requested = FALSE;
3710 #endif /* !DISABLE_PRDR */
3712 /* Check the recipients count again, as the MIME ACL might have changed
3715 GET_OPTION("acl_smtp_data");
3716 if (acl_smtp_data && recipients_count > 0)
3718 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3719 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3722 recipients_count = 0;
3723 blackholed_by = US"DATA ACL";
3725 blackhole_log_msg = string_sprintf(": %s", log_msg);
3726 cancel_cutthrough_connection(TRUE, US"data acl discard");
3730 Uunlink(spool_name);
3731 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3732 #ifdef WITH_CONTENT_SCAN
3735 #ifdef EXPERIMENTAL_DCC
3738 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3739 smtp_yield = FALSE; /* No more messages after dropped connection */
3740 smtp_reply = US""; /* Indicate reply already sent */
3741 goto NOT_ACCEPTED; /* Skip to end of function */
3746 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3747 we cannot take different actions for permanent and temporary rejections. */
3752 #ifdef WITH_CONTENT_SCAN
3753 GET_OPTION("acl_not_smtp_mime");
3754 if ( acl_not_smtp_mime
3755 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3759 #endif /* WITH_CONTENT_SCAN */
3761 GET_OPTION("acl_not_smtp");
3764 uschar * user_msg, * log_msg;
3765 f.authentication_local = TRUE;
3766 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3769 recipients_count = 0;
3770 blackholed_by = US"non-SMTP ACL";
3772 blackhole_log_msg = string_sprintf(": %s", log_msg);
3776 Uunlink(spool_name);
3777 #ifdef WITH_CONTENT_SCAN
3780 #ifdef EXPERIMENTAL_DCC
3783 /* The ACL can specify where rejections are to be logged, possibly
3784 nowhere. The default is main and reject logs. */
3786 if (log_reject_target)
3787 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3788 sender_address, log_msg);
3790 if (!user_msg) user_msg = US"local configuration problem";
3791 if (smtp_batched_input)
3792 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3793 /* Does not return */
3796 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3797 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3798 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3800 /* Does not return */
3803 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3807 /* The applicable ACLs have been run */
3809 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3810 if (f.queue_only_policy) queued_by = US"ACL";
3813 #ifdef WITH_CONTENT_SCAN
3817 #ifdef EXPERIMENTAL_DCC
3822 #ifdef HAVE_LOCAL_SCAN
3823 /* The final check on the message is to run the scan_local() function. The
3824 version supplied with Exim always accepts, but this is a hook for sysadmins to
3825 supply their own checking code. The local_scan() function is run even when all
3826 the recipients have been discarded. */
3828 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
3830 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3831 deleted, and the incident gets logged. */
3833 if (sigsetjmp(local_scan_env, 1) == 0)
3835 had_local_scan_crash = 0;
3836 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3837 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3838 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3839 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3841 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3842 local_scan_timeout);
3843 local_scan_data = NULL;
3845 had_local_scan_timeout = 0;
3846 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3847 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3848 rc = local_scan(data_fd, &local_scan_data);
3850 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3852 f.enable_dollar_recipients = FALSE;
3854 store_pool = POOL_MAIN; /* In case changed */
3855 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3858 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3859 os_non_restarting_signal(SIGFPE, SIG_DFL);
3860 os_non_restarting_signal(SIGILL, SIG_DFL);
3861 os_non_restarting_signal(SIGBUS, SIG_DFL);
3865 if (had_local_scan_crash)
3867 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3868 "signal %d - message temporarily rejected (size %d)",
3869 had_local_scan_crash, message_size);
3870 receive_bomb_out(US"local-scan-error", US"local verification problem");
3871 /* Does not return */
3873 if (had_local_scan_timeout)
3875 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3876 "message temporarily rejected (size %d)", message_size);
3877 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3878 /* Does not return */
3882 /* The length check is paranoia against some runaway code, and also because
3883 (for a success return) lines in the spool file are read into big_buffer. */
3885 if (local_scan_data)
3887 int len = Ustrlen(local_scan_data);
3888 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3889 local_scan_data = string_copyn(local_scan_data, len);
3892 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3894 if (!f.deliver_freeze) /* ACL might have already frozen */
3896 f.deliver_freeze = TRUE;
3897 deliver_frozen_at = time(NULL);
3898 frozen_by = US"local_scan()";
3900 rc = LOCAL_SCAN_ACCEPT;
3902 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3904 if (!f.queue_only_policy) /* ACL might have already queued */
3906 f.queue_only_policy = TRUE;
3907 queued_by = US"local_scan()";
3909 rc = LOCAL_SCAN_ACCEPT;
3912 /* Message accepted: remove newlines in local_scan_data because otherwise
3913 the spool file gets corrupted. Ensure that all recipients are qualified. */
3915 if (rc == LOCAL_SCAN_ACCEPT)
3917 if (local_scan_data)
3918 for (uschar * s = local_scan_data; *s; s++) if (*s == '\n') *s = ' ';
3919 for (recipient_item * r = recipients_list;
3920 r < recipients_list + recipients_count; r++)
3922 r->address = rewrite_address_qualify(r->address, TRUE);
3924 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3926 if (recipients_count == 0 && !blackholed_by)
3927 blackholed_by = US"local_scan";
3930 /* Message rejected: newlines permitted in local_scan_data to generate
3931 multiline SMTP responses. */
3935 uschar *istemp = US"";
3939 errmsg = local_scan_data;
3941 Uunlink(spool_name); /* Cancel this message */
3945 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3946 "rejection given", rc);
3949 case LOCAL_SCAN_REJECT_NOLOGHDR:
3950 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3953 case LOCAL_SCAN_REJECT:
3954 smtp_code = US"550";
3955 if (!errmsg) errmsg = US"Administrative prohibition";
3958 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3959 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3962 case LOCAL_SCAN_TEMPREJECT:
3964 smtp_code = US"451";
3965 if (!errmsg) errmsg = US"Temporary local problem";
3966 istemp = US"temporarily ";
3970 g = string_append(NULL, 2, US"F=", *sender_address ? sender_address : US"<>");
3971 g = add_host_info_for_log(g);
3973 log_write(0, LOG_MAIN|LOG_REJECT, "%Y %srejected by local_scan(): %.256s",
3974 g, istemp, string_printing(errmsg));
3977 if (!smtp_batched_input)
3979 smtp_respond(smtp_code, 3, SR_FINAL, errmsg);
3980 smtp_reply = US""; /* Indicate reply already sent */
3981 goto NOT_ACCEPTED; /* Skip to end of function */
3984 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3985 /* Does not return */
3988 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3989 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3990 US"message rejected by local scan code: ", error_rc, spool_data_file,
3992 /* Does not return */
3996 /* Reset signal handlers to ignore signals that previously would have caused
3997 the message to be abandoned. */
3999 signal(SIGTERM, SIG_IGN);
4000 signal(SIGINT, SIG_IGN);
4001 #endif /* HAVE_LOCAL_SCAN */
4003 /* If we are faking a reject or defer, avoid sennding a DSN for the
4004 actually-accepted message */
4006 if (fake_response != OK)
4007 for (recipient_item * r = recipients_list;
4008 r < recipients_list + recipients_count; r++)
4010 DEBUG(D_receive) if (r->dsn_flags & (rf_notify_success | rf_notify_delay))
4011 debug_printf("DSN: clearing flags due to fake-response for message\n");
4012 r->dsn_flags = r->dsn_flags & ~(rf_notify_success | rf_notify_delay)
4017 /* Ensure the first time flag is set in the newly-received message. */
4019 f.deliver_firsttime = TRUE;
4021 #ifdef EXPERIMENTAL_BRIGHTMAIL
4023 { /* rewind data file */
4024 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
4025 bmi_verdicts = bmi_process_message(header_list, data_fd);
4029 /* Update the timestamp in our Received: header to account for any time taken by
4030 an ACL or by local_scan(). The new time is the time that all reception
4031 processing is complete. */
4033 timestamp = expand_string(US"${tod_full}");
4034 tslen = Ustrlen(timestamp);
4036 memcpy(received_header->text + received_header->slen - tslen - 1,
4039 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
4043 f.deliver_freeze = FALSE;
4044 f.queue_only_policy = FALSE;
4047 /* Keep the data file open until we have written the header file, in order to
4048 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
4049 don't write the header file, and we unlink the data file. If writing the header
4050 file fails, we have failed to accept this message. */
4052 if (host_checking || blackholed_by)
4054 Uunlink(spool_name);
4055 msg_size = 0; /* Compute size for log line */
4056 for (header_line * h = header_list; h; h = h->next)
4057 if (h->type != '*') msg_size += h->slen;
4060 /* Write the -H file */
4063 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
4065 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
4066 Uunlink(spool_name); /* Lose the data file */
4070 smtp_reply = US"451 Error in writing spool file";
4075 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4076 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4078 /* Does not return */
4083 /* The message has now been successfully received. */
4085 receive_messagecount++;
4087 if ( fflush(spool_data_file)
4088 #if _POSIX_C_SOURCE >= 199309L || _XOPEN_SOURCE >= 500
4089 # ifdef ENABLE_DISABLE_FSYNC
4090 || !disable_fsync && fdatasync(data_fd)
4092 || fdatasync(data_fd)
4097 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
4098 log_write(0, LOG_MAIN, "%s\n", errmsg);
4099 Uunlink(spool_name); /* Lose the data file */
4103 smtp_reply = US"451 Error in writing spool file";
4108 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4109 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4111 /* Does not return */
4115 /* Add data size to written header size. We do not count the initial file name
4116 that is in the file, but we do add one extra for the notional blank line that
4117 precedes the data. This total differs from message_size in that it include the
4118 added Received: header and any other headers that got created locally. */
4120 fstat(data_fd, &statbuf);
4121 msg_size += statbuf.st_size - spool_data_start_offset(message_id) + 1;
4123 /* Generate a "message received" log entry. We do this by building up a dynamic
4124 string as required. We log the arrival of a new message while the
4125 file is still locked, just in case the machine is *really* fast, and delivers
4126 it first! Include any message id that is in the message - since the syntax of a
4127 message id is actually an addr-spec, we can use the parse routine to canonicalize
4130 rcvd_log_reset_point = store_mark();
4131 g = string_get(256);
4133 g = string_append(g, 2,
4134 fake_response == FAIL ? US"(= " : US"<= ",
4135 *sender_address ? sender_address : US"<>");
4136 if (message_reference)
4137 g = string_append(g, 2, US" R=", message_reference);
4139 g = add_host_info_for_log(g);
4142 if (LOGGING(tls_cipher) && tls_in.cipher)
4144 g = string_append(g, 2, US" X=", tls_in.cipher);
4145 # ifndef DISABLE_TLS_RESUME
4146 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4147 g = string_catn(g, US"*", 1);
4150 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4151 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4152 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4153 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4154 if (LOGGING(tls_sni) && tls_in.sni)
4155 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4158 if (sender_host_authenticated)
4160 g = string_append(g, 2, US" A=", sender_host_authenticated);
4161 if (authenticated_id)
4163 g = string_append(g, 2, US":", authenticated_id);
4164 if (LOGGING(smtp_mailauth) && authenticated_sender)
4165 g = string_append(g, 2, US":", authenticated_sender);
4169 #ifndef DISABLE_PRDR
4171 g = string_catn(g, US" PRDR", 5);
4174 #ifdef SUPPORT_PROXY
4175 if (proxy_session && LOGGING(proxy))
4176 g = string_append(g, 2, US" PRX=", proxy_local_address);
4179 if (chunking_state > CHUNKING_OFFERED)
4180 g = string_catn(g, US" K", 2);
4182 g = string_fmt_append(g, " S=%d", msg_size);
4184 /* log 8BITMIME mode announced in MAIL_FROM
4188 if (LOGGING(8bitmime))
4189 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4191 #ifndef DISABLE_DKIM
4192 if (LOGGING(dkim) && dkim_verify_overall)
4193 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4194 # ifdef EXPERIMENTAL_ARC
4195 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4196 g = string_catn(g, US" ARC", 4);
4200 if (LOGGING(receive_time))
4202 struct timeval diff = received_time_complete;
4203 timediff(&diff, &received_time);
4204 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4208 g = string_append(g, 2, US" Q=", queue_name);
4210 /* If an addr-spec in a message-id contains a quoted string, it can contain
4211 any characters except " \ and CR and so in particular it can contain NL!
4212 Therefore, make sure we use a printing-characters only version for the log.
4213 Also, allow for domain literals in the message id. */
4215 if ( LOGGING(msg_id) && msgid_header
4216 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4220 BOOL save_allow_domain_literals = allow_domain_literals;
4221 allow_domain_literals = TRUE;
4222 int start, end, domain;
4224 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4225 &errmsg, &start, &end, &domain, FALSE);
4226 allow_domain_literals = save_allow_domain_literals;
4228 g = string_append(g, 2,
4229 msgid_header_newly_created ? US" id*=" : US" id=",
4230 string_printing(old_id));
4233 /* If subject logging is turned on, create suitable printing-character
4234 text. By expanding $h_subject: we make use of the MIME decoding. */
4236 if (LOGGING(subject) && subject_header)
4238 uschar *p = big_buffer;
4239 uschar *ss = expand_string(US"$h_subject:");
4241 /* Backslash-quote any double quotes or backslashes so as to make a
4242 a C-like string, and turn any non-printers into escape sequences. */
4245 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4247 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4252 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4255 /* Terminate the string: string_cat() and string_append() leave room, but do
4256 not put the zero in. */
4258 (void) string_from_gstring(g);
4260 /* Create a message log file if message logs are being used and this message is
4261 not blackholed. Write the reception stuff to it. We used to leave message log
4262 creation until the first delivery, but this has proved confusing for some
4265 if (message_logs && !blackholed_by)
4268 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4270 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4274 (void)directory_make(spool_directory,
4275 spool_sname(US"msglog", message_subdir),
4276 MSGLOG_DIRECTORY_MODE, TRUE);
4277 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4281 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4282 m_name, strerror(errno));
4285 FILE *message_log = fdopen(fd, "a");
4288 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4289 m_name, strerror(errno));
4294 uschar * now = tod_stamp(tod_log);
4295 /* Drop the initial "<= " */
4296 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4297 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4299 if (f.queue_only_policy) fprintf(message_log,
4300 "%s no immediate delivery: queued%s%s by %s\n", now,
4301 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4303 (void)fclose(message_log);
4308 /* Everything has now been done for a successful message except logging its
4309 arrival, and outputting an SMTP response. While writing to the log, set a flag
4310 to cause a call to receive_bomb_out() if the log cannot be opened. */
4312 f.receive_call_bombout = TRUE;
4314 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4315 connection has gone away. This can only be done if there is no unconsumed input
4316 waiting in the local input buffer. We can test for this by calling
4317 receive_hasc(). RFC 2920 (pipelining) explicitly allows for additional
4318 input to be sent following the final dot, so the presence of following input is
4321 If the connection is still present, but there is no unread input for the
4322 socket, the result of a select() call will be zero. If, however, the connection
4323 has gone away, or if there is pending input, the result of select() will be
4324 non-zero. The two cases can be distinguished by trying to read the next input
4325 character. If we succeed, we can unread it so that it remains in the local
4326 buffer for handling later. If not, the connection has been lost.
4328 Of course, since TCP/IP is asynchronous, there is always a chance that the
4329 connection will vanish between the time of this test and the sending of the
4330 response, but the chance of this happening should be small. */
4332 if ( smtp_input && sender_host_address && !f.sender_host_notsocket
4335 if (poll_one_fd(fileno(smtp_in), POLLIN, 0) != 0)
4337 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4338 if (c != EOF) (receive_ungetc)(c);
4341 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4342 smtp_reply = US""; /* No attempt to send a response */
4343 smtp_yield = FALSE; /* Nothing more on this connection */
4345 /* Re-use the log line workspace */
4348 g = string_cat(g, US"SMTP connection lost after final dot");
4349 g = add_host_info_for_log(g);
4350 log_write(0, LOG_MAIN, "%Y", g);
4352 /* Delete the files for this aborted message. */
4354 Uunlink(spool_name);
4355 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4356 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4363 /* The connection has not gone away; we really are going to take responsibility
4364 for this message. */
4366 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4369 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4370 the sender's dot (below).
4371 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4372 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4373 in which case pass temp-reject back to initiator and dump the files.
4375 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4377 XXX We do not handle queue-only, freezing, or blackholes.
4379 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4381 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4382 /* Logging was done in finaldot() */
4385 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4386 cutthrough_done = ACCEPTED;
4387 break; /* message_id needed for SMTP accept below */
4389 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4390 ... for which, pass back the exact error */
4391 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4392 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4393 break; /* message_id needed for SMTP accept below */
4395 default: /* Unknown response, or error. Treat as temp-reject. */
4396 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4397 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4398 break; /* message_id needed for SMTP accept below */
4400 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4401 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4402 cutthrough_done = PERM_REJ;
4407 #ifndef DISABLE_PRDR
4408 if(!smtp_reply || prdr_requested)
4413 log_write(0, LOG_MAIN |
4414 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4415 (LOGGING(received_sender) ? LOG_SENDER : 0),
4418 /* Log any control actions taken by an ACL or local_scan(). */
4420 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4421 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4422 "no immediate delivery: queued%s%s by %s",
4423 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4426 f.receive_call_bombout = FALSE;
4428 /* The store for the main log message can be reused */
4429 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4431 /* If the message is frozen, and freeze_tell is set, do the telling. */
4433 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4434 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4435 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4436 message_id, frozen_by, sender_address);
4439 /* Either a message has been successfully received and written to the two spool
4440 files, or an error in writing the spool has occurred for an SMTP message, or
4441 an SMTP message has been rejected for policy reasons, or a message was passed on
4442 by cutthrough delivery. (For a non-SMTP message we will have already given up
4443 because there's no point in carrying on!) For non-cutthrough we must now close
4444 (and thereby unlock) the data file. In the successful case, this leaves the
4445 message on the spool, ready for delivery. In the error case, the spool file will
4446 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4449 For cutthrough we hold the data file locked until we have deleted it, otherwise
4450 a queue-runner could grab it in the window.
4452 A fflush() was done earlier in the expectation that any write errors on the
4453 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4454 possible for fclose() to fail - and this has been seen on obscure filesystems
4455 (probably one that delayed the actual media write as long as possible)
4456 but what to do? What has happened to the lock if this happens?
4457 It's a mess because we already logged the acceptance.
4458 We can at least log the issue, try to remove spoolfiles and respond with
4459 a temp-reject. We do not want to close before logging acceptance because
4460 we want to hold the lock until we know that logging worked.
4461 Could we make this less likely by doing an fdatasync() just after the fflush()?
4462 That seems like a good thing on data-security grounds, but how much will it hit
4469 message_id[0] = 0; /* Indicate no message accepted */
4472 process_info[process_info_len] = 0; /* Remove message id */
4473 if (spool_data_file && cutthrough_done == NOT_TRIED)
4475 if (fclose(spool_data_file)) /* Frees the lock */
4477 log_msg = string_sprintf("spoolfile error on close: %s", strerror(errno));
4478 log_write(0, LOG_MAIN|LOG_PANIC |
4479 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4480 (LOGGING(received_sender) ? LOG_SENDER : 0),
4482 log_write(0, LOG_MAIN |
4483 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4484 (LOGGING(received_sender) ? LOG_SENDER : 0),
4485 "rescind the above message-accept");
4487 Uunlink(spool_name);
4488 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4489 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4491 /* Claim a data ACL temp-reject, just to get reject logging and response */
4492 if (smtp_input) smtp_handle_acl_fail(ACL_WHERE_DATA, rc, NULL, log_msg);
4493 smtp_reply = US""; /* Indicate reply already sent */
4495 message_id[0] = 0; /* no message accepted */
4497 spool_data_file = NULL;
4500 /* Now reset signal handlers to their defaults */
4502 signal(SIGTERM, SIG_DFL);
4503 signal(SIGINT, SIG_DFL);
4505 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4506 value, which defaults TRUE - meaning there may be more incoming messages from
4507 this connection. For non-SMTP callers (where there is only ever one message),
4508 the default is FALSE. */
4514 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4515 is set to the response that should be sent. When it is NULL, we generate
4516 default responses. After an ACL error or local_scan() error, the response has
4517 already been sent, and smtp_reply is an empty string to indicate this. */
4519 if (!smtp_batched_input)
4523 if (fake_response != OK)
4524 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4525 3, SR_FINAL, fake_response_text);
4527 /* An OK response is required; use "message" text if present. */
4531 uschar *code = US"250";
4533 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4534 smtp_respond(code, len, SR_FINAL, user_msg);
4537 /* Default OK response */
4539 else if (chunking_state > CHUNKING_OFFERED)
4541 /* If there is more input waiting, no need to flush (probably the client
4542 pipelined QUIT after data). We check only the in-process buffer, not
4545 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4547 chunking_datasize, message_size+message_linecount, message_id);
4548 chunking_state = CHUNKING_OFFERED;
4551 smtp_printf("250 OK id=%s\r\n", receive_hasc(), message_id);
4555 "\n**** SMTP testing: that is not a real message id!\n\n");
4558 /* smtp_reply is set non-empty */
4560 else if (smtp_reply[0] != 0)
4561 if (fake_response != OK && smtp_reply[0] == '2')
4562 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4563 3, SR_FINAL, fake_response_text);
4565 smtp_printf("%.1024s\r\n", SP_NO_MORE, smtp_reply);
4567 switch (cutthrough_done)
4570 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4572 /* Delete spool files */
4573 Uunlink(spool_name);
4574 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4575 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4579 if (cutthrough.defer_pass)
4581 Uunlink(spool_name);
4582 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4583 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4588 if (cutthrough_done != NOT_TRIED)
4590 if (spool_data_file)
4592 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4593 spool_data_file = NULL;
4595 message_id[0] = 0; /* Prevent a delivery from starting */
4596 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4597 cutthrough.defer_pass = FALSE;
4601 /* For batched SMTP, generate an error message on failure, and do
4602 nothing on success. The function moan_smtp_batch() does not return -
4603 it exits from the program with a non-zero return code. */
4605 else if (smtp_reply)
4606 moan_smtp_batch(NULL, "%s", smtp_reply);
4610 /* If blackholing, we can immediately log this message's sad fate. The data
4611 file has already been unlinked, and the header file was never written to disk.
4612 We must now indicate that nothing was received, to prevent a delivery from
4617 const uschar *detail =
4618 #ifdef HAVE_LOCAL_SCAN
4619 local_scan_data ? string_printing(local_scan_data) :
4621 string_sprintf("(%s discarded recipients)", blackholed_by);
4622 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4623 log_write(0, LOG_MAIN, "Completed");
4627 /* Reset headers so that logging of rejects for a subsequent message doesn't
4628 include them. It is also important to set header_last = NULL before exiting
4629 from this function, as this prevents certain rewrites that might happen during
4630 subsequent verifying (of another incoming message) from trying to add headers
4631 when they shouldn't. */
4633 header_list = header_last = NULL;
4635 return yield; /* TRUE if more messages (SMTP only) */
4638 /* End of receive.c */
4639 /* vi: se aw ai sw=2