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 if (misc_mod_msg_init() != OK)
1834 /* In SMTP sessions we may receive several messages in one connection. Before
1835 each subsequent one, we wait for the clock to tick at the level of message-id
1837 This is so that the combination of time+pid is unique, even on systems where the
1838 pid can be re-used within our time interval. We can't shorten the interval
1839 without re-designing the message-id. See comments above where the message id is
1840 created. This is Something For The Future.
1841 Do this wait any time we have previously created a message-id, even if we
1842 rejected the message. This gives unique IDs for logging done by ACLs.
1843 The initial timestamp must have been obtained via exim_gettime() to avoid
1844 issues on Linux with suspend/resume. */
1846 if (message_id_tv.tv_sec)
1848 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
1849 exim_wait_tick(&message_id_tv, id_resolution);
1852 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1853 ids, and fractions of a second are required. See the comments that precede the
1854 message id creation below.
1855 We use a routine that if possible uses a monotonic clock, and can be used again
1856 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1859 exim_gettime(&message_id_tv);
1861 /* For other uses of the received time we can operate with granularity of one
1862 second, and for that we use the global variable received_time. This is for
1863 things like ultimate message timeouts.
1864 For this we do not care about the Linux suspend/resume problem, so rather than
1865 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1867 gettimeofday(&received_time, NULL);
1869 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1870 happen in the smtp_getc() function when it refills its buffer. */
1872 had_data_timeout = 0;
1874 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1876 /* If not SMTP input, timeout happens only if configured, and we just set a
1877 single timeout for the whole message. */
1879 else if (receive_timeout > 0)
1881 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1882 ALARM(receive_timeout);
1885 /* SIGTERM and SIGINT are caught always. */
1887 had_data_sigint = 0;
1888 signal(SIGTERM, data_sigterm_sigint_handler);
1889 signal(SIGINT, data_sigterm_sigint_handler);
1891 /* Header lines in messages are not supposed to be very long, though when
1892 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1893 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1894 storing the header, and extend this as necessary using string_cat().
1896 To cope with total lunacies, impose an upper limit on the length of the header
1897 section of the message, as otherwise the store will fill up. We must also cope
1898 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1899 Folded header lines are joined into one string, leaving the '\n' characters
1900 inside them, so that writing them out reproduces the input.
1902 Loop for each character of each header; the next structure for chaining the
1903 header is set up already, with ptr the offset of the next character in
1908 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1910 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1911 SMTP must have a correct "." terminator. */
1913 if (smtp_input /* && !smtp_batched_input */)
1916 smtp_reply = handle_lost_connection(US" (header)");
1918 goto TIDYUP; /* Skip to end of function */
1923 /* See if we are at the current header's size limit - there must be at least
1924 four bytes left. This allows for the new character plus a zero, plus two for
1925 extra insertions when we are playing games with dots and carriage returns. If
1926 we are at the limit, extend the text buffer. This could have been done
1927 automatically using string_cat() but because this is a tightish loop storing
1928 only one character at a time, we choose to do it inline. Normally
1929 store_extend() will be able to extend the block; only at the end of a big
1930 store block will a copy be needed. To handle the case of very long headers
1931 (and sometimes lunatic messages can have ones that are 100s of K long) we
1932 call store_release() for strings that have been copied - if the string is at
1933 the start of a block (and therefore the only thing in it, because we aren't
1934 doing any other gets), the block gets freed. We can only do this release if
1935 there were no allocations since the once that we want to free. */
1937 if (ptr >= header_size - 4)
1939 int oldsize = header_size;
1941 if (header_size >= INT_MAX/2)
1945 if (!store_extend(next->text, oldsize, header_size))
1946 next->text = store_newblock(next->text, header_size, ptr);
1949 /* Cope with receiving a binary zero. There is dispute about whether
1950 these should be allowed in RFC 822 messages. The middle view is that they
1951 should not be allowed in headers, at least. Exim takes this attitude at
1952 the moment. We can't just stomp on them here, because we don't know that
1953 this line is a header yet. Set a flag to cause scanning later. */
1955 if (ch == 0) had_zero++;
1957 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1958 those from data files use just LF. Treat LF in local SMTP input as a
1959 terminator too. Treat EOF as a line terminator always. */
1961 if (ch < 0) goto EOL;
1963 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1964 other MTAs accept this. We are therefore forced into this "liberalisation"
1965 too, so we accept LF as a line terminator whatever the source of the message.
1966 However, if the first line of the message ended with a CRLF, we treat a bare
1967 LF specially by inserting a white space after it to ensure that the header
1968 line is not terminated. */
1972 if (first_line_ended_crlf == TRUE_UNSET)
1973 first_line_ended_crlf = FALSE;
1974 else if (first_line_ended_crlf)
1975 receive_ungetc(' ');
1979 /* This is not the end of the line. If this is SMTP input and this is
1980 the first character in the line and it is a "." character, ignore it.
1981 This implements the dot-doubling rule, though header lines starting with
1982 dots aren't exactly common. They are legal in RFC 822, though. If the
1983 following is CRLF or LF, this is the line that that terminates the
1985 entire message. We set message_ended to indicate this has happened (to
1986 prevent further reading), and break out of the loop, having freed the
1987 empty header, and set next = NULL to indicate no data line. */
1989 if (f.dot_ends && ptr == 0 && ch == '.')
1991 /* leading dot while in headers-read mode */
1992 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1993 if (ch == '\n' && first_line_ended_crlf == TRUE /* and not TRUE_UNSET */ )
1994 /* dot, LF but we are in CRLF mode. Attack? */
1995 ch = ' '; /* replace the LF with a space */
1997 else if (ch == '\r')
1999 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2002 if (ch >= 0) receive_ungetc(ch);
2003 ch = '\r'; /* Revert to CR */
2008 message_ended = END_DOT;
2009 reset_point = store_reset(reset_point);
2011 break; /* End character-reading loop */
2014 /* For non-SMTP input, the dot at the start of the line was really a data
2015 character. What is now in ch is the following character. We guaranteed
2016 enough space for this above. */
2020 next->text[ptr++] = '.';
2025 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
2026 remember this case if this is the first line ending. */
2030 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2033 if (first_line_ended_crlf == TRUE_UNSET)
2034 first_line_ended_crlf = TRUE;
2038 /* Otherwise, put back the character after CR, and turn the bare CR
2041 if (ch >= 0) (receive_ungetc)(ch);
2042 next->text[ptr++] = '\n';
2047 /* We have a data character for the header line. */
2049 next->text[ptr++] = ch; /* Add to buffer */
2050 message_size++; /* Total message size so far */
2052 /* Handle failure due to a humungously long header section. The >= allows
2053 for the terminating \n. Add what we have so far onto the headers list so
2054 that it gets reflected in any error message, and back up the just-read
2057 if (message_size >= header_maxsize)
2060 next->text[ptr] = 0;
2062 next->type = htype_other;
2064 header_last->next = next;
2067 log_write(0, LOG_MAIN, "ridiculously long message header received from "
2068 "%s (more than %d characters): message abandoned",
2069 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
2073 smtp_reply = US"552 Message header is ridiculously long";
2074 receive_swallow_smtp();
2075 goto TIDYUP; /* Skip to end of function */
2080 give_local_error(ERRMESS_VLONGHEADER,
2081 string_sprintf("message header longer than %d characters received: "
2082 "message not accepted", header_maxsize), US"", error_rc, stdin,
2084 /* Does not return */
2088 continue; /* With next input character */
2090 /* End of header line reached */
2094 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2096 receive_linecount++;
2097 message_linecount++;
2099 /* Keep track of maximum line length */
2101 if (ptr - prevlines_length > max_received_linelength)
2102 max_received_linelength = ptr - prevlines_length;
2103 prevlines_length = ptr + 1;
2105 /* Now put in the terminating newline. There is always space for
2106 at least two more characters. */
2108 next->text[ptr++] = '\n';
2111 /* A blank line signals the end of the headers; release the unwanted
2112 space and set next to NULL to indicate this. */
2116 reset_point = store_reset(reset_point);
2121 /* There is data in the line; see if the next input character is a
2122 whitespace character. If it is, we have a continuation of this header line.
2123 There is always space for at least one character at this point. */
2127 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2128 if (nextch == ' ' || nextch == '\t')
2130 next->text[ptr++] = nextch;
2131 if (++message_size >= header_maxsize)
2133 continue; /* Iterate the loop */
2135 else if (nextch >= 0) /* not EOF, ERR etc */
2136 (receive_ungetc)(nextch); /* For next time */
2137 else ch = nextch; /* Cause main loop to exit at end */
2140 /* We have got to the real line end. Terminate the string and release store
2141 beyond it. If it turns out to be a real header, internal binary zeros will
2142 be squashed later. */
2144 next->text[ptr] = 0;
2146 store_release_above(next->text + ptr + 1);
2148 /* Check the running total size against the overall message size limit. We
2149 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2150 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2151 headers - the code to read the body will then also hit the buffer. */
2153 if (message_size > thismessage_size_limit) break;
2155 /* A line that is not syntactically correct for a header also marks
2156 the end of the headers. In this case, we leave next containing the
2157 first data line. This might actually be several lines because of the
2158 continuation logic applied above, but that doesn't matter.
2160 It turns out that smail, and presumably sendmail, accept leading lines
2163 From ph10 Fri Jan 5 12:35 GMT 1996
2165 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2166 find any documentation of this, but for compatibility it had better be
2167 accepted. Exim restricts it to the case of non-smtp messages, and
2168 treats it as an alternative to the -f command line option. Thus it is
2169 ignored except for trusted users or filter testing. Otherwise it is taken
2170 as the sender address, unless -f was used (sendmail compatibility).
2172 It further turns out that some UUCPs generate the From_line in a different
2175 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2177 The regex for matching these things is now capable of recognizing both
2178 formats (including 2- and 4-digit years in the latter). In fact, the regex
2179 is now configurable, as is the expansion string to fish out the sender.
2181 Even further on it has been discovered that some broken clients send
2182 these lines in SMTP messages. There is now an option to ignore them from
2183 specified hosts or networks. Sigh. */
2185 if ( header_last == header_list
2187 || ( sender_host_address
2188 && verify_check_host(&ignore_fromline_hosts) == OK
2190 || (!sender_host_address && ignore_fromline_local)
2192 && regex_match_and_setup(regex_From, next->text, 0, -1)
2195 if (!f.sender_address_forced)
2197 uschar * uucp_sender;
2198 GET_OPTION("uucp_from_sender");
2199 if (!(uucp_sender = expand_string(uucp_from_sender)))
2200 log_write(0, LOG_MAIN|LOG_PANIC,
2201 "expansion of \"%s\" failed after matching "
2202 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2205 int start, end, domain;
2207 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2208 &start, &end, &domain, TRUE);
2211 if (domain == 0 && newsender[0] != 0)
2212 /* deconst ok as newsender was not const */
2213 newsender = US rewrite_address_qualify(newsender, FALSE);
2215 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2217 sender_address = newsender;
2219 if (f.trusted_caller || filter_test != FTEST_NONE)
2221 authenticated_sender = NULL;
2222 originator_name = US"";
2223 f.sender_local = FALSE;
2226 if (filter_test != FTEST_NONE)
2227 printf("Sender taken from \"From \" line\n");
2234 /* Not a leading "From " line. Check to see if it is a valid header line.
2235 Header names may contain any non-control characters except space and colon,
2240 uschar * p = next->text;
2242 /* If not a valid header line, break from the header reading loop, leaving
2243 next != NULL, indicating that it holds the first line of the body. */
2245 if (isspace(*p)) break;
2246 while (mac_isgraph(*p) && *p != ':') p++;
2247 if (Uskip_whitespace(&p) != ':')
2249 body_zerocount = had_zero;
2253 /* We have a valid header line. If there were any binary zeroes in
2254 the line, stomp on them here. */
2257 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2260 /* It is perfectly legal to have an empty continuation line
2261 at the end of a header, but it is confusing to humans
2262 looking at such messages, since it looks like a blank line.
2263 Reduce confusion by removing redundant white space at the
2264 end. We know that there is at least one printing character
2265 (the ':' tested for above) so there is no danger of running
2268 p = next->text + ptr - 2;
2271 while (*p == ' ' || *p == '\t') p--;
2272 if (*p != '\n') break;
2273 ptr = (p--) - next->text + 1;
2274 message_size -= next->slen - ptr;
2275 next->text[ptr] = 0;
2279 /* Add the header to the chain */
2281 next->type = htype_other;
2283 header_last->next = next;
2286 /* Check the limit for individual line lengths. This comes after adding to
2287 the chain so that the failing line is reflected if a bounce is generated
2288 (for a local message). */
2290 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2292 log_write(0, LOG_MAIN, "overlong message header line received from "
2293 "%s (more than %d characters): message abandoned",
2294 f.sender_host_unknown ? sender_ident : sender_fullhost,
2295 header_line_maxsize);
2299 smtp_reply = US"552 A message header line is too long";
2300 receive_swallow_smtp();
2301 goto TIDYUP; /* Skip to end of function */
2305 give_local_error(ERRMESS_VLONGHDRLINE,
2306 string_sprintf("message header line longer than %d characters "
2307 "received: message not accepted", header_line_maxsize), US"",
2308 error_rc, stdin, header_list->next);
2309 /* Does not return */
2312 /* Note if any resent- fields exist. */
2314 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2316 resents_exist = TRUE;
2317 resent_prefix = US"Resent-";
2321 /* Reject CHUNKING messages that do not CRLF their first header line */
2323 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2325 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2326 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2328 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2329 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2330 smtp_printf("552 Message header not CRLF terminated\r\n", SP_NO_MORE);
2333 goto TIDYUP; /* Skip to end of function */
2336 /* The line has been handled. If we have hit EOF, break out of the loop,
2337 indicating no pending data line and no more data for the message */
2342 if (ch == EOF) message_ended = END_DOT;
2343 else if (ch == ERR) message_ended = END_PROTOCOL;
2347 /* Set up for the next header */
2349 reset_point = store_mark();
2351 next = store_get(sizeof(header_line), GET_UNTAINTED);
2352 next->text = store_get(header_size, GET_TAINTED);
2355 prevlines_length = 0;
2356 } /* Continue, starting to read the next header */
2358 /* At this point, we have read all the headers into a data structure in main
2359 store. The first header is still the dummy placeholder for the Received: header
2360 we are going to generate a bit later on. If next != NULL, it contains the first
2361 data line - which terminated the headers before reaching a blank line (not the
2366 debug_printf(">>Headers received:\n");
2367 for (header_line * h = header_list->next; h; h = h->next)
2368 debug_printf("%s", h->text);
2372 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2373 is dropped immediately after valid headers, the next thing we will see is EOF.
2374 We must test for this specially, as further down the reading of the data is
2375 skipped if already at EOF.
2376 In CHUNKING mode, a protocol error makes us give up on the message. */
2379 if ((receive_feof)())
2381 smtp_reply = handle_lost_connection(US" (after header)");
2383 goto TIDYUP; /* Skip to end of function */
2385 else if (message_ended == END_PROTOCOL)
2387 smtp_reply = US""; /* no reply needed */
2391 /* If this is a filter test run and no headers were read, output a warning
2392 in case there is a mistake in the test message. */
2394 if (filter_test != FTEST_NONE && header_list->next == NULL)
2395 printf("Warning: no message headers read\n");
2398 /* Scan the headers to identify them. Some are merely marked for later
2399 processing; some are dealt with here. */
2401 for (header_line * h = header_list->next; h; h = h->next)
2403 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2404 if (is_resent) contains_resent_headers = TRUE;
2406 switch (header_checkname(h, is_resent))
2409 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2413 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2416 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2419 if (!resents_exist || is_resent) date_header_exists = TRUE;
2422 /* Same comments as about Return-Path: below. */
2424 case htype_delivery_date:
2425 if (delivery_date_remove) h->type = htype_old;
2428 /* Same comments as about Return-Path: below. */
2430 case htype_envelope_to:
2431 if (envelope_to_remove) h->type = htype_old;
2434 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2435 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2436 header consists of just the login id of the user who called Exim, rewrite
2437 it with the gecos field first. Apply this rule to Resent-From: if there
2438 are resent- fields. */
2441 h->type = htype_from;
2442 #ifdef SUPPORT_DMARC
2443 if (!is_resent) dmarc_from_header = h;
2445 if (!resents_exist || is_resent)
2451 uschar * s = Ustrchr(h->text, ':') + 1;
2453 Uskip_whitespace(&s);
2454 len = h->slen - (s - h->text) - 1;
2455 if (Ustrlen(originator_login) == len &&
2456 strncmpic(s, originator_login, len) == 0)
2458 uschar * name = is_resent ? US"Resent-From" : US"From";
2459 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2460 originator_login, qualify_domain_sender);
2461 from_header = header_last;
2462 h->type = htype_old;
2463 DEBUG(D_receive|D_rewrite)
2464 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2470 /* Identify the Message-id: header for generating "in-reply-to" in the
2471 autoreply transport. For incoming logging, save any resent- value. In both
2472 cases, take just the first of any multiples. */
2475 if (!msgid_header && (!resents_exist || is_resent))
2482 /* Flag all Received: headers */
2484 case htype_received:
2485 h->type = htype_received;
2489 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2491 case htype_reply_to:
2492 h->type = htype_reply_to;
2495 /* The Return-path: header is supposed to be added to messages when
2496 they leave the SMTP system. We shouldn't receive messages that already
2497 contain Return-path. However, since Exim generates Return-path: on
2498 local delivery, resent messages may well contain it. We therefore
2499 provide an option (which defaults on) to remove any Return-path: headers
2500 on input. Removal actually means flagging as "old", which prevents the
2501 header being transmitted with the message. */
2503 case htype_return_path:
2504 if (return_path_remove) h->type = htype_old;
2506 /* If we are testing a mail filter file, use the value of the
2507 Return-Path: header to set up the return_path variable, which is not
2508 otherwise set. However, remove any <> that surround the address
2509 because the variable doesn't have these. */
2511 if (filter_test != FTEST_NONE)
2513 uschar * start = h->text + 12;
2514 uschar * end = start + Ustrlen(start);
2516 Uskip_whitespace(&start);
2517 while (end > start && isspace(end[-1])) end--;
2518 if (*start == '<' && end[-1] == '>')
2520 return_path = string_copyn(start, end - start);
2521 printf("Return-path taken from \"Return-path:\" header line\n");
2525 /* If there is a "Sender:" header and the message is locally originated,
2526 and from an untrusted caller and suppress_local_fixups is not set, or if we
2527 are in submission mode for a remote message, mark it "old" so that it will
2528 not be transmitted with the message, unless active_local_sender_retain is
2529 set. (This can only be true if active_local_from_check is false.) If there
2530 are any resent- headers in the message, apply this rule to Resent-Sender:
2531 instead of Sender:. Messages with multiple resent- header sets cannot be
2532 tidily handled. (For this reason, at least one MUA - Pine - turns old
2533 resent- headers into X-resent- headers when resending, leaving just one
2537 h->type = !f.active_local_sender_retain
2538 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2539 || f.submission_mode
2541 && (!resents_exist || is_resent)
2542 ? htype_old : htype_sender;
2545 /* Remember the Subject: header for logging. There is no Resent-Subject */
2551 /* "To:" gets flagged, and the existence of a recipient header is noted,
2552 whether it's resent- or not. */
2557 to_or_cc_header_exists = TRUE;
2563 /* Extract recipients from the headers if that is required (the -t option).
2564 Note that this is documented as being done *before* any address rewriting takes
2565 place. There are two possibilities:
2567 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2568 recipients already listed are to be REMOVED from the message. Smail 3 works
2569 like this. We need to build a non-recipients tree for that list, because in
2570 subsequent processing this data is held in a tree and that's what the
2571 spool_write_header() function expects. Make sure that non-recipient addresses
2572 are fully qualified and rewritten if necessary.
2574 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2575 those in the command line arguments (and it is rumoured some other MTAs do
2576 this). Therefore, there is an option to make Exim behave this way.
2578 *** Notes on "Resent-" header lines ***
2580 The presence of resent-headers in the message makes -t horribly ambiguous.
2581 Experiments with sendmail showed that it uses recipients for all resent-
2582 headers, totally ignoring the concept of "sets of resent- headers" as described
2583 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2584 with all the addresses in one instance of each header.
2586 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2587 error for -t if there were resent- headers in the message. However, after a
2588 discussion on the mailing list, I've learned that there are MUAs that use
2589 resent- headers with -t, and also that the stuff about sets of resent- headers
2590 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2591 message with -t and resent- header lines makes sure that only *its* resent-
2592 headers are present; previous ones are often renamed as X-resent- for example.
2594 Consequently, Exim has been changed so that, if any resent- header lines are
2595 present, the recipients are taken from all of the appropriate resent- lines,
2596 and not from the ordinary To:, Cc:, etc. */
2601 error_block **bnext = &bad_addresses;
2603 if (extract_addresses_remove_arguments)
2605 while (recipients_count-- > 0)
2607 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2608 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2609 tree_add_nonrecipient(s);
2611 recipients_list = NULL;
2612 recipients_count = recipients_list_max = 0;
2615 /* Now scan the headers */
2617 for (header_line * h = header_list->next; h; h = h->next)
2619 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2620 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2622 uschar * s = Ustrchr(h->text, ':') + 1;
2623 Uskip_whitespace(&s);
2625 f.parse_allow_group = TRUE; /* Allow address group syntax */
2629 uschar *ss = parse_find_address_end(s, FALSE);
2630 uschar *recipient, *errmess, *pp;
2631 int start, end, domain;
2633 /* Check on maximum */
2635 if (recipients_max_expanded > 0 && ++rcount > recipients_max_expanded)
2636 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2637 US"message rejected: ", error_rc, stdin, NULL);
2638 /* Does not return */
2640 /* Make a copy of the address, and remove any internal newlines. These
2641 may be present as a result of continuations of the header line. The
2642 white space that follows the newline must not be removed - it is part
2645 pp = recipient = store_get(ss - s + 1, s);
2646 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2651 BOOL b = allow_utf8_domains;
2652 allow_utf8_domains = TRUE;
2654 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2659 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2660 else allow_utf8_domains = b;
2666 /* Keep a list of all the bad addresses so we can send a single
2667 error message at the end. However, an empty address is not an error;
2668 just ignore it. This can come from an empty group list like
2670 To: Recipients of list:;
2672 If there are no recipients at all, an error will occur later. */
2674 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2676 int len = Ustrlen(s);
2677 error_block * b = store_get(sizeof(error_block), GET_UNTAINTED);
2678 while (len > 0 && isspace(s[len-1])) len--;
2680 b->text1 = string_printing(string_copyn(s, len));
2686 /* If the recipient is already in the nonrecipients tree, it must
2687 have appeared on the command line with the option extract_addresses_
2688 remove_arguments set. Do not add it to the recipients, and keep a note
2689 that this has happened, in order to give a better error if there are
2690 no recipients left. */
2694 if (tree_search(tree_nonrecipients, recipient) == NULL)
2695 receive_add_recipient(recipient, -1);
2697 extracted_ignored = TRUE;
2700 /* Move on past this address */
2702 s = ss + (*ss ? 1 : 0);
2703 Uskip_whitespace(&s);
2704 } /* Next address */
2706 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2707 f.parse_found_group = FALSE;
2709 /* If this was the bcc: header, mark it "old", which means it
2710 will be kept on the spool, but not transmitted as part of the
2713 if (h->type == htype_bcc) h->type = htype_old;
2714 } /* For appropriate header line */
2715 } /* For each header line */
2719 /* Now build the unique message id. This has changed several times over the
2720 lifetime of Exim, and is changing for Exim 4.97.
2721 The previous change was in about 2003.
2723 Detail for the pre-4.97 version is here in [square-brackets].
2725 The message ID has 3 parts: tttttt-ppppppppppp-ssss (6, 11, 4 - total 23 with
2726 the dashes). Each part is a number in base 62.
2727 [ tttttt-pppppp-ss 6, 6, 2 => 16 ]
2729 The first part is the current time, in seconds. Six chars is enough until
2730 year 3700 with case-sensitive filesystes, but will run out in 2038 on
2731 case-insensitive ones (Cygwin, Darwin - where we have to use base-36.
2732 Both of those are in the "unsupported" bucket, so ignore for now).
2734 The second part is the current pid, and supports 64b [31b] PIDs.
2736 The third part holds sub-second time, plus (when localhost_number is set)
2737 the host number multiplied by a number large enough to keep it away from
2738 the time portion. Host numbers are restricted to the range 0-16.
2739 The time resolution is variously 1, 2 or 4 microseconds [0.5 or 1 ms]
2740 depending on the use of localhost_nubmer and of case-insensitive filesystems.
2742 After a message has been received, Exim ensures that the timer has ticked at the
2743 appropriate level before proceeding, to avoid duplication if the pid happened to
2744 be re-used within the same time period. It seems likely that most messages will
2745 take at least half a millisecond to be received, so no delay will normally be
2746 necessary. At least for some time...
2748 Note that string_base62_XX() returns its data in a static storage block, so it
2749 must be copied before calling string_base62_XXX) again. It always returns exactly
2750 11 (_64) or 6 (_32) characters.
2752 There doesn't seem to be anything in the RFC which requires a message id to
2753 start with a letter, but Smail was changed to ensure this. The external form of
2754 the message id (as supplied by string expansion) therefore starts with an
2755 additional leading 'E'. The spool file names do not include this leading
2756 letter and it is not used internally.
2758 NOTE: If ever the format of message ids is changed, the regular expression for
2759 checking that a string is in this format must be updated in a corresponding
2760 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2761 must also be changed to reflect the correct string length. The queue-sort code
2762 needs to know the layout. Then, of course, other programs that rely on the
2763 message id format will need updating too (inc. at least exim_msgdate). */
2765 Ustrncpy(message_id, string_base62_32((long int)(message_id_tv.tv_sec)), MESSAGE_ID_TIME_LEN);
2766 message_id[MESSAGE_ID_TIME_LEN] = '-';
2767 Ustrncpy(message_id + MESSAGE_ID_TIME_LEN + 1,
2768 string_base62_64((long int)getpid()),
2772 /* Deal with the case where the host number is set. The value of the number was
2773 checked when it was read, to ensure it isn't too big. */
2775 if (host_number_string)
2776 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2777 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2778 string_base62_32((long int)(
2779 host_number * (1000000/id_resolution)
2780 + message_id_tv.tv_usec/id_resolution))
2781 + (6 - MESSAGE_ID_SUBTIME_LEN)
2784 /* Host number not set: final field is just the fractional time at an
2785 appropriate resolution. */
2788 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2789 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2790 string_base62_32((long int)(message_id_tv.tv_usec/id_resolution))
2791 + (6 - MESSAGE_ID_SUBTIME_LEN));
2793 /* Add the current message id onto the current process info string if
2796 (void)string_format(process_info + process_info_len,
2797 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2799 /* If we are using multiple input directories, set up the one for this message
2800 to be the least significant base-62 digit of the time of arrival. Otherwise
2801 ensure that it is an empty string. */
2803 set_subdir_str(message_subdir, message_id, 0);
2805 /* Now that we have the message-id, if there is no message-id: header, generate
2806 one, but only for local (without suppress_local_fixups) or submission mode
2807 messages. This can be user-configured if required, but we had better flatten
2808 any illegal characters therein. */
2811 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2813 uschar *id_text = US"";
2814 uschar *id_domain = primary_hostname;
2817 /* Permit only letters, digits, dots, and hyphens in the domain */
2819 GET_OPTION("message_id_header_domain");
2820 if (message_id_domain)
2822 uschar *new_id_domain = expand_string(message_id_domain);
2825 if (!f.expand_string_forcedfail)
2826 log_write(0, LOG_MAIN|LOG_PANIC,
2827 "expansion of \"%s\" (message_id_header_domain) "
2828 "failed: %s", message_id_domain, expand_string_message);
2830 else if (*new_id_domain)
2832 id_domain = new_id_domain;
2833 for (uschar * p = id_domain; *p; p++)
2834 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2838 /* Permit all characters except controls and RFC 2822 specials in the
2839 additional text part. */
2841 GET_OPTION("message_id_header_text");
2842 if (message_id_text)
2844 uschar *new_id_text = expand_string(message_id_text);
2847 if (!f.expand_string_forcedfail)
2848 log_write(0, LOG_MAIN|LOG_PANIC,
2849 "expansion of \"%s\" (message_id_header_text) "
2850 "failed: %s", message_id_text, expand_string_message);
2852 else if (*new_id_text)
2854 id_text = new_id_text;
2855 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2859 /* Add the header line.
2860 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2861 appended, to preserve classical expectations of header ordering. */
2863 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2864 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2865 *id_text == 0 ? "" : ".", id_text, id_domain);
2867 /* Arrange for newly-created Message-Id to be logged */
2871 msgid_header_newly_created = TRUE;
2876 /* If we are to log recipients, keep a copy of the raw ones before any possible
2877 rewriting. Must copy the count, because later ACLs and the local_scan()
2878 function may mess with the real recipients. */
2880 if (LOGGING(received_recipients))
2882 raw_recipients = store_get(recipients_count * sizeof(uschar *), GET_UNTAINTED);
2883 for (int i = 0; i < recipients_count; i++)
2884 raw_recipients[i] = string_copy(recipients_list[i].address);
2885 raw_recipients_count = recipients_count;
2888 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2889 recipients will get here only if the conditions were right (allow_unqualified_
2890 recipient is TRUE). */
2893 { debug_printf_indent("qualify & rewrite recipients list\n"); acl_level++; }
2894 for (int i = 0; i < recipients_count; i++)
2895 recipients_list[i].address = /* deconst ok as src was not cont */
2896 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2897 global_rewrite_rules, rewrite_existflags);
2898 DEBUG(D_rewrite) acl_level--;
2900 /* If there is no From: header, generate one for local (without
2901 suppress_local_fixups) or submission_mode messages. If there is no sender
2902 address, but the sender is local or this is a local delivery error, use the
2903 originator login. This shouldn't happen for genuine bounces, but might happen
2904 for autoreplies. The addition of From: must be done *before* checking for the
2905 possible addition of a Sender: header, because untrusted_set_sender allows an
2906 untrusted user to set anything in the envelope (which might then get info
2907 From:) but we still want to ensure a valid Sender: if it is required. */
2910 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2912 const uschar * oname = US"";
2914 /* Use the originator_name if this is a locally submitted message and the
2915 caller is not trusted. For trusted callers, use it only if -F was used to
2916 force its value or if we have a non-SMTP message for which -f was not used
2917 to set the sender. */
2919 if (!sender_host_address)
2921 if (!f.trusted_caller || f.sender_name_forced ||
2922 (!smtp_input && !f.sender_address_forced))
2923 oname = originator_name;
2926 /* For non-locally submitted messages, the only time we use the originator
2927 name is when it was forced by the /name= option on control=submission. */
2929 else if (submission_name) oname = submission_name;
2931 /* Envelope sender is empty */
2933 if (!*sender_address)
2935 uschar *fromstart, *fromend;
2937 fromstart = string_sprintf("%sFrom: %s%s",
2938 resent_prefix, oname, *oname ? " <" : "");
2939 fromend = *oname ? US">" : US"";
2941 if (f.sender_local || f.local_error_message)
2942 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2943 local_part_quote(originator_login), qualify_domain_sender,
2946 else if (f.submission_mode && authenticated_id)
2948 if (!submission_domain)
2949 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2950 local_part_quote(authenticated_id), qualify_domain_sender,
2953 else if (!*submission_domain) /* empty => whole address set */
2954 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2958 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2959 local_part_quote(authenticated_id), submission_domain, fromend);
2961 from_header = header_last; /* To get it checked for Sender: */
2965 /* There is a non-null envelope sender. Build the header using the original
2966 sender address, before any rewriting that might have been done while
2971 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2974 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2977 from_header = header_last; /* To get it checked for Sender: */
2982 /* If the sender is local (without suppress_local_fixups), or if we are in
2983 submission mode and there is an authenticated_id, check that an existing From:
2984 is correct, and if not, generate a Sender: header, unless disabled. Any
2985 previously-existing Sender: header was removed above. Note that sender_local,
2986 as well as being TRUE if the caller of exim is not trusted, is also true if a
2987 trusted caller did not supply a -f argument for non-smtp input. To allow
2988 trusted callers to forge From: without supplying -f, we have to test explicitly
2989 here. If the From: header contains more than one address, then the call to
2990 parse_extract_address fails, and a Sender: header is inserted, as required. */
2993 && ( f.active_local_from_check
2994 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2995 || f.submission_mode && authenticated_id
2998 BOOL make_sender = TRUE;
2999 int start, end, domain;
3001 uschar *from_address =
3002 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
3003 &start, &end, &domain, FALSE);
3004 uschar *generated_sender_address;
3006 generated_sender_address = f.submission_mode
3007 ? !submission_domain
3008 ? string_sprintf("%s@%s",
3009 local_part_quote(authenticated_id), qualify_domain_sender)
3010 : !*submission_domain /* empty => full address */
3011 ? string_sprintf("%s", authenticated_id)
3012 : string_sprintf("%s@%s",
3013 local_part_quote(authenticated_id), submission_domain)
3014 : string_sprintf("%s@%s",
3015 local_part_quote(originator_login), qualify_domain_sender);
3017 /* Remove permitted prefixes and suffixes from the local part of the From:
3018 address before doing the comparison with the generated sender. */
3023 uschar *at = domain ? from_address + domain - 1 : NULL;
3026 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
3027 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
3029 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
3030 from_address += slen;
3034 if ( strcmpic(generated_sender_address, from_address) == 0
3035 || (!domain && strcmpic(from_address, originator_login) == 0))
3036 make_sender = FALSE;
3039 /* We have to cause the Sender header to be rewritten if there are
3040 appropriate rewriting rules. */
3043 if (f.submission_mode && !submission_name)
3044 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
3045 generated_sender_address);
3047 header_add(htype_sender, "%sSender: %s <%s>\n",
3049 f.submission_mode ? submission_name : originator_name,
3050 generated_sender_address);
3052 /* Ensure that a non-null envelope sender address corresponds to the
3053 submission mode sender address. */
3055 if (f.submission_mode && *sender_address)
3057 if (!sender_address_unrewritten)
3058 sender_address_unrewritten = sender_address;
3059 sender_address = generated_sender_address;
3060 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
3061 log_write(L_address_rewrite, LOG_MAIN,
3062 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
3063 sender_address_unrewritten, generated_sender_address);
3067 /* If there are any rewriting rules, apply them to the sender address, unless
3068 it has already been rewritten as part of verification for SMTP input. */
3071 { debug_printf("rewrite rules on sender address\n"); acl_level++; }
3072 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
3074 /* deconst ok as src was not const */
3075 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
3076 global_rewrite_rules, rewrite_existflags);
3077 DEBUG(D_receive|D_rewrite)
3078 debug_printf("rewritten sender = %s\n", sender_address);
3080 DEBUG(D_rewrite) acl_level--;
3083 /* The headers must be run through rewrite_header(), because it ensures that
3084 addresses are fully qualified, as well as applying any rewriting rules that may
3087 Qualification of header addresses in a message from a remote host happens only
3088 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
3089 appropriate. For local messages, qualification always happens, unless -bnq is
3090 used to explicitly suppress it. No rewriting is done for an unqualified address
3091 that is left untouched.
3093 We start at the second header, skipping our own Received:. This rewriting is
3094 documented as happening *after* recipient addresses are taken from the headers
3095 by the -t command line option. An added Sender: gets rewritten here. */
3098 { debug_printf("qualify and rewrite headers\n"); acl_level++; }
3099 for (header_line * h = header_list->next, * newh; h; h = h->next)
3100 if ((newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3101 rewrite_existflags, TRUE)))
3103 DEBUG(D_rewrite) acl_level--;
3106 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3107 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3108 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3109 exists, this applies to the set of resent- headers rather than the normal set.
3111 The requirement for a recipient header has been removed in RFC 2822. At this
3112 point in the code, earlier versions of Exim added a To: header for locally
3113 submitted messages, and an empty Bcc: header for others. In the light of the
3114 changes in RFC 2822, this was dropped in November 2003. */
3117 /* If there is no date header, generate one if the message originates locally
3118 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3119 submission mode flag is set. Messages without Date: are not valid, but it seems
3120 to be more confusing if Exim adds one to all remotely-originated messages.
3121 As per Message-Id, we prepend if resending, else append.
3124 if ( !date_header_exists
3125 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3126 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3127 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3129 search_tidyup(); /* Free any cached resources */
3131 /* Show the complete set of headers if debugging. Note that the first one (the
3132 new Received:) has not yet been set. */
3136 debug_printf(">>Headers after rewriting and local additions:\n");
3138 for (header_line * h = header_list->next; h; h = h->next)
3139 debug_printf_indent("%c %s", h->type, h->text);
3144 /* The headers are now complete in store. If we are running in filter
3145 testing mode, that is all this function does. Return TRUE if the message
3146 ended with a dot. */
3148 if (filter_test != FTEST_NONE)
3150 process_info[process_info_len] = 0;
3151 return message_ended == END_DOT;
3154 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3155 think more if it could be handled. Cannot do onward CHUNKING unless
3156 inbound is, but inbound chunking ought to be ok with outbound plain.
3157 Could we do onward CHUNKING given inbound CHUNKING?
3159 if (chunking_state > CHUNKING_OFFERED)
3160 cancel_cutthrough_connection(FALSE, US"chunking active");
3162 /* Cutthrough delivery:
3163 We have to create the Received header now rather than at the end of reception,
3164 so the timestamp behaviour is a change to the normal case.
3165 Having created it, send the headers to the destination. */
3167 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3169 if (received_count > received_headers_max)
3171 cancel_cutthrough_connection(TRUE, US"too many headers");
3172 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3173 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3174 "Too many \"Received\" headers",
3176 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3177 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3178 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3179 goto NOT_ACCEPTED; /* Skip to end of function */
3181 received_header_gen();
3182 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3183 (void) cutthrough_headers_send();
3187 /* Open a new spool file for the data portion of the message. We need
3188 to access it both via a file descriptor and a stdio stream. Try to make the
3189 directory if it isn't there. */
3191 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3192 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3194 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3196 if (errno == ENOENT)
3198 (void) directory_make(spool_directory,
3199 spool_sname(US"input", message_subdir),
3200 INPUT_DIRECTORY_MODE, TRUE);
3201 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3204 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3205 spool_name, strerror(errno));
3208 /* Make sure the file's group is the Exim gid, and double-check the mode
3209 because the group setting doesn't always get set automatically. */
3211 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3212 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3213 "Failed setting ownership on spool file %s: %s",
3214 spool_name, strerror(errno));
3215 (void)fchmod(data_fd, SPOOL_MODE);
3217 /* We now have data file open. Build a stream for it and lock it. We lock only
3218 the first line of the file (containing the message ID) because otherwise there
3219 are problems when Exim is run under Cygwin (I'm told). See comments in
3220 spool_in.c, where the same locking is done. */
3222 spool_data_file = fdopen(data_fd, "w+");
3223 lock_data.l_type = F_WRLCK;
3224 lock_data.l_whence = SEEK_SET;
3225 lock_data.l_start = 0;
3226 lock_data.l_len = spool_data_start_offset(message_id);
3228 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3229 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3230 errno, strerror(errno));
3232 /* We have an open, locked data file. Write the message id to it to make it
3233 self-identifying. Then read the remainder of the input of this message and
3234 write it to the data file. If the variable next != NULL, it contains the first
3235 data line (which was read as a header but then turned out not to have the right
3236 format); write it (remembering that it might contain binary zeros). The result
3237 of fwrite() isn't inspected; instead we call ferror() below. */
3239 fprintf(spool_data_file, "%s-D\n", message_id);
3242 uschar *s = next->text;
3243 int len = next->slen;
3244 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3245 body_linecount++; /* Assumes only 1 line */
3248 /* Note that we might already be at end of file, or the logical end of file
3249 (indicated by '.'), or might have encountered an error while writing the
3250 message id or "next" line. */
3252 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3256 message_ended = chunking_state <= CHUNKING_OFFERED
3257 ? read_message_data_smtp(spool_data_file, first_line_ended_crlf)
3259 ? read_message_bdat_smtp_wire(spool_data_file)
3260 : read_message_bdat_smtp(spool_data_file);
3261 receive_linecount++; /* The terminating "." line */
3264 message_ended = read_message_data(spool_data_file);
3266 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3267 message_linecount += body_linecount;
3269 switch (message_ended)
3271 /* Handle premature termination of SMTP */
3276 Uunlink(spool_name); /* Lose data file when closed */
3277 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3278 smtp_reply = handle_lost_connection(US"");
3280 goto NOT_ACCEPTED; /* Skip to end of function */
3284 /* Handle message that is too big. Don't use host_or_ident() in the log
3285 message; we want to see the ident value even for non-remote messages. */
3288 Uunlink(spool_name); /* Lose the data file when closed */
3289 cancel_cutthrough_connection(TRUE, US"mail too big");
3290 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3292 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3293 "message too big: read=%d max=%d",
3295 sender_fullhost ? " H=" : "",
3296 sender_fullhost ? sender_fullhost : US"",
3297 sender_ident ? " U=" : "",
3298 sender_ident ? sender_ident : US"",
3300 thismessage_size_limit);
3304 smtp_reply = US"552 Message size exceeds maximum permitted";
3305 goto NOT_ACCEPTED; /* Skip to end of function */
3309 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3310 give_local_error(ERRMESS_TOOBIG,
3311 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3312 US"message rejected: ", error_rc, spool_data_file, header_list);
3313 /* Does not return */
3317 /* Handle bad BDAT protocol sequence */
3320 Uunlink(spool_name); /* Lose the data file when closed */
3321 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3322 smtp_reply = US""; /* Response already sent */
3323 goto NOT_ACCEPTED; /* Skip to end of function */
3327 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3328 example, there may be some expansion in an ACL that uses a timer.) */
3330 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3332 /* The message body has now been read into the data file. Call fflush() to
3333 empty the buffers in C, and then call fsync() to get the data written out onto
3334 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3335 having to do this). If there was an I/O error on either input or output,
3336 attempt to send an error message, and unlink the spool file. For non-SMTP input
3337 we can then give up. Note that for SMTP input we must swallow the remainder of
3338 the input in cases of output errors, since the far end doesn't expect to see
3339 anything until the terminating dot line is sent. */
3341 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3342 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3344 uschar *msg_errno = US strerror(errno);
3345 BOOL input_error = (receive_ferror)() != 0;
3346 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3347 input_error? "Input read" : "Spool write",
3349 sender_fullhost ? sender_fullhost : sender_ident);
3351 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3352 Uunlink(spool_name); /* Lose the data file */
3353 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3358 smtp_reply = US"451 Error while reading input data";
3361 smtp_reply = US"451 Error while writing spool file";
3362 receive_swallow_smtp();
3364 goto NOT_ACCEPTED; /* Skip to end of function */
3369 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3370 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3372 /* Does not return */
3377 /* No I/O errors were encountered while writing the data file. */
3379 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3380 gettimeofday(&received_time_complete, NULL);
3383 /* If there were any bad addresses extracted by -t, or there were no recipients
3384 left after -t, send a message to the sender of this message, or write it to
3385 stderr if the error handling option is set that way. Note that there may
3386 legitimately be no recipients for an SMTP message if they have all been removed
3389 We need to rewind the data file in order to read it. In the case of no
3390 recipients or stderr error writing, throw the data file away afterwards, and
3391 exit. (This can't be SMTP, which always ensures there's at least one
3392 syntactically good recipient address.) */
3394 if (extract_recip && (bad_addresses || recipients_count == 0))
3398 if (recipients_count == 0) debug_printf("*** No recipients\n");
3401 debug_printf("*** Bad address(es)\n");
3402 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3403 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3407 log_write(0, LOG_MAIN|LOG_PANIC, "%s found in headers",
3408 bad_addresses ? "bad addresses" : "no recipients");
3410 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3412 /* If configured to send errors to the sender, but this fails, force
3413 a failure error code. We use a special one for no recipients so that it
3414 can be detected by the autoreply transport. Otherwise error_rc is set to
3415 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3416 it is EXIT_SUCCESS. */
3418 if (error_handling == ERRORS_SENDER)
3420 if (!moan_to_sender(
3422 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3423 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3424 bad_addresses, header_list, spool_data_file, FALSE
3426 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3431 if (extracted_ignored)
3432 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3434 fprintf(stderr, "exim: no recipients in message\n");
3437 fprintf(stderr, "exim: invalid address%s",
3438 bad_addresses->next ? "es:\n" : ":");
3439 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3440 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3441 bad_addresses->text2);
3445 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3447 Uunlink(spool_name);
3448 (void)fclose(spool_data_file);
3449 exim_exit(error_rc);
3453 /* Data file successfully written. Generate text for the Received: header by
3454 expanding the configured string, and adding a timestamp. By leaving this
3455 operation till now, we ensure that the timestamp is the time that message
3456 reception was completed. However, this is deliberately done before calling the
3457 data ACL and local_scan().
3459 This Received: header may therefore be inspected by the data ACL and by code in
3460 the local_scan() function. When they have run, we update the timestamp to be
3461 the final time of reception.
3463 If there is just one recipient, set up its value in the $received_for variable
3464 for use when we generate the Received: header.
3466 Note: the checking for too many Received: headers is handled by the delivery
3468 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3470 if (!received_header->text) /* Non-cutthrough case */
3472 received_header_gen();
3474 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3476 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3477 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3479 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3480 now, before running the DATA ACL. */
3482 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3485 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3486 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3488 /* If an ACL is specified for checking things at this stage of reception of a
3489 message, run it, unless all the recipients were removed by "discard" in earlier
3490 ACLs. That is the only case in which recipients_count can be zero at this
3491 stage. Set deliver_datafile to point to the data file so that $message_body and
3492 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3495 deliver_datafile = data_fd;
3498 f.enable_dollar_recipients = TRUE;
3500 if (recipients_count == 0)
3501 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3505 /* Handle interactive SMTP messages */
3507 if (smtp_input && !smtp_batched_input)
3510 #ifndef DISABLE_DKIM
3511 if (!f.dkim_disable_verify)
3513 misc_module_info * mi = misc_mod_findonly(US"dkim");
3516 typedef void (*vfin_fn_t)(void);
3517 typedef int (*vacl_fn_t)(uschar **, uschar**);
3518 typedef void (*vlog_fn_t)(void);
3520 /* Finish off the body hashes, calculate sigs and do compares */
3522 (((vfin_fn_t *) mi->functions)[DKIM_VERIFY_FINISH]) ();
3524 /* Check if we must run the DKIM ACL */
3526 GET_OPTION("acl_smtp_dkim");
3529 rc = (((vacl_fn_t *) mi->functions)[DKIM_ACL_ENTRY])
3530 (&user_msg, &log_msg);
3531 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3535 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3539 Uunlink(spool_name);
3540 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3541 smtp_yield = FALSE; /* No more msgs after dropped conn */
3542 smtp_reply = US""; /* Indicate reply already sent */
3543 goto NOT_ACCEPTED; /* Skip to end of function */
3545 recipients_count = 0;
3546 blackholed_by = US"DKIM ACL";
3548 blackhole_log_msg = string_sprintf(": %s", log_msg);
3551 else /* No ACL; just log */
3552 (((vlog_fn_t *) mi->functions)[DKIM_VERIFY_LOG_ALL]) ();
3555 #endif /* DISABLE_DKIM */
3557 #ifdef WITH_CONTENT_SCAN
3558 if (recipients_count > 0)
3560 GET_OPTION("acl_smtp_mime");
3562 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3566 #endif /* WITH_CONTENT_SCAN */
3568 #ifdef SUPPORT_DMARC
3570 misc_module_info * mi = misc_mod_findonly(US"dmarc");
3573 typedef int (*fn_t)(header_line *);
3574 (((fn_t *) mi->functions)[DMARC_STORE_DATA]) (dmarc_from_header);
3579 #ifndef DISABLE_PRDR
3580 if (prdr_requested && recipients_count > 1)
3582 GET_OPTION("acl_smtp_data_prdr");
3583 if (acl_smtp_data_prdr)
3586 int all_fail = FAIL;
3588 smtp_printf("353 PRDR content analysis beginning\r\n", SP_MORE);
3589 /* Loop through recipients, responses must be in same order received */
3590 for (unsigned int c = 0; recipients_count > c; c++)
3592 const uschar * addr = recipients_list[c].address;
3593 uschar * msg= US"PRDR R=<%s> %s";
3596 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3597 addr, c+1, recipients_count);
3598 rc = acl_check(ACL_WHERE_PRDR, addr,
3599 acl_smtp_data_prdr, &user_msg, &log_msg);
3601 /* If any recipient rejected content, indicate it in final message */
3603 /* If all recipients rejected, indicate in final message */
3608 case OK: case DISCARD: code = US"250"; break;
3609 case DEFER: code = US"450"; break;
3610 default: code = US"550"; break;
3612 if (user_msg != NULL)
3613 smtp_user_msg(code, user_msg);
3618 case OK: case DISCARD:
3619 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3621 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3623 msg = string_sprintf(CS msg, addr, "refusal"); break;
3625 smtp_user_msg(code, msg);
3627 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3628 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3629 else log_write(0, LOG_MAIN, "%s", CS msg);
3631 if (rc != OK) { receive_remove_recipient(addr); c--; }
3633 /* Set up final message, used if data acl gives OK */
3634 smtp_reply = string_sprintf("%s id=%s message %s",
3635 all_fail == FAIL ? US"550" : US"250",
3638 ? US"rejected for all recipients"
3641 : US"accepted for some recipients");
3642 if (recipients_count == 0)
3646 prdr_requested = FALSE;
3649 prdr_requested = FALSE;
3650 #endif /* !DISABLE_PRDR */
3652 /* Check the recipients count again, as the MIME ACL might have changed
3655 GET_OPTION("acl_smtp_data");
3656 if (acl_smtp_data && recipients_count > 0)
3658 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3659 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3662 recipients_count = 0;
3663 blackholed_by = US"DATA ACL";
3665 blackhole_log_msg = string_sprintf(": %s", log_msg);
3666 cancel_cutthrough_connection(TRUE, US"data acl discard");
3670 Uunlink(spool_name);
3671 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3672 #ifdef WITH_CONTENT_SCAN
3675 #ifdef EXPERIMENTAL_DCC
3678 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3679 smtp_yield = FALSE; /* No more messages after dropped connection */
3680 smtp_reply = US""; /* Indicate reply already sent */
3681 goto NOT_ACCEPTED; /* Skip to end of function */
3686 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3687 we cannot take different actions for permanent and temporary rejections. */
3692 #ifdef WITH_CONTENT_SCAN
3693 GET_OPTION("acl_not_smtp_mime");
3694 if ( acl_not_smtp_mime
3695 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3699 #endif /* WITH_CONTENT_SCAN */
3701 GET_OPTION("acl_not_smtp");
3704 uschar * user_msg, * log_msg;
3705 f.authentication_local = TRUE;
3706 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3709 recipients_count = 0;
3710 blackholed_by = US"non-SMTP ACL";
3712 blackhole_log_msg = string_sprintf(": %s", log_msg);
3716 Uunlink(spool_name);
3717 #ifdef WITH_CONTENT_SCAN
3720 #ifdef EXPERIMENTAL_DCC
3723 /* The ACL can specify where rejections are to be logged, possibly
3724 nowhere. The default is main and reject logs. */
3726 if (log_reject_target)
3727 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3728 sender_address, log_msg);
3730 if (!user_msg) user_msg = US"local configuration problem";
3731 if (smtp_batched_input)
3732 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3733 /* Does not return */
3736 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3737 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3738 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3740 /* Does not return */
3743 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3747 /* The applicable ACLs have been run */
3749 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3750 if (f.queue_only_policy) queued_by = US"ACL";
3753 #ifdef WITH_CONTENT_SCAN
3757 #ifdef EXPERIMENTAL_DCC
3762 #ifdef HAVE_LOCAL_SCAN
3763 /* The final check on the message is to run the scan_local() function. The
3764 version supplied with Exim always accepts, but this is a hook for sysadmins to
3765 supply their own checking code. The local_scan() function is run even when all
3766 the recipients have been discarded. */
3768 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
3770 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3771 deleted, and the incident gets logged. */
3773 if (sigsetjmp(local_scan_env, 1) == 0)
3775 had_local_scan_crash = 0;
3776 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3777 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3778 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3779 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3781 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3782 local_scan_timeout);
3783 local_scan_data = NULL;
3785 had_local_scan_timeout = 0;
3786 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3787 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3788 rc = local_scan(data_fd, &local_scan_data);
3790 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3792 f.enable_dollar_recipients = FALSE;
3794 store_pool = POOL_MAIN; /* In case changed */
3795 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3798 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3799 os_non_restarting_signal(SIGFPE, SIG_DFL);
3800 os_non_restarting_signal(SIGILL, SIG_DFL);
3801 os_non_restarting_signal(SIGBUS, SIG_DFL);
3805 if (had_local_scan_crash)
3807 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3808 "signal %d - message temporarily rejected (size %d)",
3809 had_local_scan_crash, message_size);
3810 receive_bomb_out(US"local-scan-error", US"local verification problem");
3811 /* Does not return */
3813 if (had_local_scan_timeout)
3815 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3816 "message temporarily rejected (size %d)", message_size);
3817 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3818 /* Does not return */
3822 /* The length check is paranoia against some runaway code, and also because
3823 (for a success return) lines in the spool file are read into big_buffer. */
3825 if (local_scan_data)
3827 int len = Ustrlen(local_scan_data);
3828 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3829 local_scan_data = string_copyn(local_scan_data, len);
3832 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3834 if (!f.deliver_freeze) /* ACL might have already frozen */
3836 f.deliver_freeze = TRUE;
3837 deliver_frozen_at = time(NULL);
3838 frozen_by = US"local_scan()";
3840 rc = LOCAL_SCAN_ACCEPT;
3842 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3844 if (!f.queue_only_policy) /* ACL might have already queued */
3846 f.queue_only_policy = TRUE;
3847 queued_by = US"local_scan()";
3849 rc = LOCAL_SCAN_ACCEPT;
3852 /* Message accepted: remove newlines in local_scan_data because otherwise
3853 the spool file gets corrupted. Ensure that all recipients are qualified. */
3855 if (rc == LOCAL_SCAN_ACCEPT)
3857 if (local_scan_data)
3858 for (uschar * s = local_scan_data; *s; s++) if (*s == '\n') *s = ' ';
3859 for (recipient_item * r = recipients_list;
3860 r < recipients_list + recipients_count; r++)
3862 r->address = rewrite_address_qualify(r->address, TRUE);
3864 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3866 if (recipients_count == 0 && !blackholed_by)
3867 blackholed_by = US"local_scan";
3870 /* Message rejected: newlines permitted in local_scan_data to generate
3871 multiline SMTP responses. */
3875 uschar *istemp = US"";
3879 errmsg = local_scan_data;
3881 Uunlink(spool_name); /* Cancel this message */
3885 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3886 "rejection given", rc);
3889 case LOCAL_SCAN_REJECT_NOLOGHDR:
3890 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3893 case LOCAL_SCAN_REJECT:
3894 smtp_code = US"550";
3895 if (!errmsg) errmsg = US"Administrative prohibition";
3898 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3899 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3902 case LOCAL_SCAN_TEMPREJECT:
3904 smtp_code = US"451";
3905 if (!errmsg) errmsg = US"Temporary local problem";
3906 istemp = US"temporarily ";
3910 g = string_append(NULL, 2, US"F=", *sender_address ? sender_address : US"<>");
3911 g = add_host_info_for_log(g);
3913 log_write(0, LOG_MAIN|LOG_REJECT, "%Y %srejected by local_scan(): %.256s",
3914 g, istemp, string_printing(errmsg));
3917 if (!smtp_batched_input)
3919 smtp_respond(smtp_code, 3, SR_FINAL, errmsg);
3920 smtp_reply = US""; /* Indicate reply already sent */
3921 goto NOT_ACCEPTED; /* Skip to end of function */
3924 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3925 /* Does not return */
3928 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3929 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3930 US"message rejected by local scan code: ", error_rc, spool_data_file,
3932 /* Does not return */
3936 /* Reset signal handlers to ignore signals that previously would have caused
3937 the message to be abandoned. */
3939 signal(SIGTERM, SIG_IGN);
3940 signal(SIGINT, SIG_IGN);
3941 #endif /* HAVE_LOCAL_SCAN */
3943 /* If we are faking a reject or defer, avoid sennding a DSN for the
3944 actually-accepted message */
3946 if (fake_response != OK)
3947 for (recipient_item * r = recipients_list;
3948 r < recipients_list + recipients_count; r++)
3950 DEBUG(D_receive) if (r->dsn_flags & (rf_notify_success | rf_notify_delay))
3951 debug_printf("DSN: clearing flags due to fake-response for message\n");
3952 r->dsn_flags = r->dsn_flags & ~(rf_notify_success | rf_notify_delay)
3957 /* Ensure the first time flag is set in the newly-received message. */
3959 f.deliver_firsttime = TRUE;
3961 #ifdef EXPERIMENTAL_BRIGHTMAIL
3963 { /* rewind data file */
3964 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
3965 bmi_verdicts = bmi_process_message(header_list, data_fd);
3969 /* Update the timestamp in our Received: header to account for any time taken by
3970 an ACL or by local_scan(). The new time is the time that all reception
3971 processing is complete. */
3973 timestamp = expand_string(US"${tod_full}");
3974 tslen = Ustrlen(timestamp);
3976 memcpy(received_header->text + received_header->slen - tslen - 1,
3979 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3983 f.deliver_freeze = FALSE;
3984 f.queue_only_policy = FALSE;
3987 /* Keep the data file open until we have written the header file, in order to
3988 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3989 don't write the header file, and we unlink the data file. If writing the header
3990 file fails, we have failed to accept this message. */
3992 if (host_checking || blackholed_by)
3994 Uunlink(spool_name);
3995 msg_size = 0; /* Compute size for log line */
3996 for (header_line * h = header_list; h; h = h->next)
3997 if (h->type != '*') msg_size += h->slen;
4000 /* Write the -H file */
4003 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
4005 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
4006 Uunlink(spool_name); /* Lose the data file */
4010 smtp_reply = US"451 Error in writing spool file";
4015 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4016 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4018 /* Does not return */
4023 /* The message has now been successfully received. */
4025 receive_messagecount++;
4027 if ( fflush(spool_data_file)
4028 #if _POSIX_C_SOURCE >= 199309L || _XOPEN_SOURCE >= 500
4029 # ifdef ENABLE_DISABLE_FSYNC
4030 || !disable_fsync && fdatasync(data_fd)
4032 || fdatasync(data_fd)
4037 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
4038 log_write(0, LOG_MAIN, "%s\n", errmsg);
4039 Uunlink(spool_name); /* Lose the data file */
4043 smtp_reply = US"451 Error in writing spool file";
4048 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4049 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4051 /* Does not return */
4055 /* Add data size to written header size. We do not count the initial file name
4056 that is in the file, but we do add one extra for the notional blank line that
4057 precedes the data. This total differs from message_size in that it include the
4058 added Received: header and any other headers that got created locally. */
4060 fstat(data_fd, &statbuf);
4061 msg_size += statbuf.st_size - spool_data_start_offset(message_id) + 1;
4063 /* Generate a "message received" log entry. We do this by building up a dynamic
4064 string as required. We log the arrival of a new message while the
4065 file is still locked, just in case the machine is *really* fast, and delivers
4066 it first! Include any message id that is in the message - since the syntax of a
4067 message id is actually an addr-spec, we can use the parse routine to canonicalize
4070 rcvd_log_reset_point = store_mark();
4071 g = string_get(256);
4073 g = string_append(g, 2,
4074 fake_response == FAIL ? US"(= " : US"<= ",
4075 *sender_address ? sender_address : US"<>");
4076 if (message_reference)
4077 g = string_append(g, 2, US" R=", message_reference);
4079 g = add_host_info_for_log(g);
4082 if (LOGGING(tls_cipher) && tls_in.cipher)
4084 g = string_append(g, 2, US" X=", tls_in.cipher);
4085 # ifndef DISABLE_TLS_RESUME
4086 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4087 g = string_catn(g, US"*", 1);
4090 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4091 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4092 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4093 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4094 if (LOGGING(tls_sni) && tls_in.sni)
4095 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4098 if (sender_host_authenticated)
4100 g = string_append(g, 2, US" A=", sender_host_authenticated);
4101 if (authenticated_id)
4103 g = string_append(g, 2, US":", authenticated_id);
4104 if (LOGGING(smtp_mailauth) && authenticated_sender)
4105 g = string_append(g, 2, US":", authenticated_sender);
4109 #ifndef DISABLE_PRDR
4111 g = string_catn(g, US" PRDR", 5);
4114 #ifdef SUPPORT_PROXY
4115 if (proxy_session && LOGGING(proxy))
4116 g = string_append(g, 2, US" PRX=", proxy_local_address);
4119 if (chunking_state > CHUNKING_OFFERED)
4120 g = string_catn(g, US" K", 2);
4122 g = string_fmt_append(g, " S=%d", msg_size);
4124 /* log 8BITMIME mode announced in MAIL_FROM
4128 if (LOGGING(8bitmime))
4129 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4131 #ifndef DISABLE_DKIM
4134 misc_module_info * mi = misc_mod_findonly(US"dkim");
4135 typedef gstring * (*fn_t)(gstring *);
4137 g = (((fn_t *) mi->functions)[DKIM_VDOM_FIRSTPASS]) (g);
4139 # ifdef EXPERIMENTAL_ARC
4140 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4141 g = string_catn(g, US" ARC", 4);
4145 if (LOGGING(receive_time))
4147 struct timeval diff = received_time_complete;
4148 timediff(&diff, &received_time);
4149 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4153 g = string_append(g, 2, US" Q=", queue_name);
4155 /* If an addr-spec in a message-id contains a quoted string, it can contain
4156 any characters except " \ and CR and so in particular it can contain NL!
4157 Therefore, make sure we use a printing-characters only version for the log.
4158 Also, allow for domain literals in the message id. */
4160 if ( LOGGING(msg_id) && msgid_header
4161 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4165 BOOL save_allow_domain_literals = allow_domain_literals;
4166 allow_domain_literals = TRUE;
4167 int start, end, domain;
4169 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4170 &errmsg, &start, &end, &domain, FALSE);
4171 allow_domain_literals = save_allow_domain_literals;
4173 g = string_append(g, 2,
4174 msgid_header_newly_created ? US" id*=" : US" id=",
4175 string_printing(old_id));
4178 /* If subject logging is turned on, create suitable printing-character
4179 text. By expanding $h_subject: we make use of the MIME decoding. */
4181 if (LOGGING(subject) && subject_header)
4183 uschar *p = big_buffer;
4184 uschar *ss = expand_string(US"$h_subject:");
4186 /* Backslash-quote any double quotes or backslashes so as to make a
4187 a C-like string, and turn any non-printers into escape sequences. */
4190 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4192 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4197 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4200 /* Terminate the string: string_cat() and string_append() leave room, but do
4201 not put the zero in. */
4203 (void) string_from_gstring(g);
4205 /* Create a message log file if message logs are being used and this message is
4206 not blackholed. Write the reception stuff to it. We used to leave message log
4207 creation until the first delivery, but this has proved confusing for some
4210 if (message_logs && !blackholed_by)
4213 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4215 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4219 (void)directory_make(spool_directory,
4220 spool_sname(US"msglog", message_subdir),
4221 MSGLOG_DIRECTORY_MODE, TRUE);
4222 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4226 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4227 m_name, strerror(errno));
4230 FILE *message_log = fdopen(fd, "a");
4233 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4234 m_name, strerror(errno));
4239 uschar * now = tod_stamp(tod_log);
4240 /* Drop the initial "<= " */
4241 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4242 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4244 if (f.queue_only_policy) fprintf(message_log,
4245 "%s no immediate delivery: queued%s%s by %s\n", now,
4246 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4248 (void)fclose(message_log);
4253 /* Everything has now been done for a successful message except logging its
4254 arrival, and outputting an SMTP response. While writing to the log, set a flag
4255 to cause a call to receive_bomb_out() if the log cannot be opened. */
4257 f.receive_call_bombout = TRUE;
4259 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4260 connection has gone away. This can only be done if there is no unconsumed input
4261 waiting in the local input buffer. We can test for this by calling
4262 receive_hasc(). RFC 2920 (pipelining) explicitly allows for additional
4263 input to be sent following the final dot, so the presence of following input is
4266 If the connection is still present, but there is no unread input for the
4267 socket, the result of a select() call will be zero. If, however, the connection
4268 has gone away, or if there is pending input, the result of select() will be
4269 non-zero. The two cases can be distinguished by trying to read the next input
4270 character. If we succeed, we can unread it so that it remains in the local
4271 buffer for handling later. If not, the connection has been lost.
4273 Of course, since TCP/IP is asynchronous, there is always a chance that the
4274 connection will vanish between the time of this test and the sending of the
4275 response, but the chance of this happening should be small. */
4277 if ( smtp_input && sender_host_address && !f.sender_host_notsocket
4280 if (poll_one_fd(fileno(smtp_in), POLLIN, 0) != 0)
4282 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4283 if (c != EOF) (receive_ungetc)(c);
4286 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4287 smtp_reply = US""; /* No attempt to send a response */
4288 smtp_yield = FALSE; /* Nothing more on this connection */
4290 /* Re-use the log line workspace */
4293 g = string_cat(g, US"SMTP connection lost after final dot");
4294 g = add_host_info_for_log(g);
4295 log_write(0, LOG_MAIN, "%Y", g);
4297 /* Delete the files for this aborted message. */
4299 Uunlink(spool_name);
4300 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4301 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4308 /* The connection has not gone away; we really are going to take responsibility
4309 for this message. */
4311 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4314 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4315 the sender's dot (below).
4316 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4317 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4318 in which case pass temp-reject back to initiator and dump the files.
4320 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4322 XXX We do not handle queue-only, freezing, or blackholes.
4324 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4326 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4327 /* Logging was done in finaldot() */
4330 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4331 cutthrough_done = ACCEPTED;
4332 break; /* message_id needed for SMTP accept below */
4334 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4335 ... for which, pass back the exact error */
4336 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4337 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4338 break; /* message_id needed for SMTP accept below */
4340 default: /* Unknown response, or error. Treat as temp-reject. */
4341 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4342 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4343 break; /* message_id needed for SMTP accept below */
4345 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4346 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4347 cutthrough_done = PERM_REJ;
4352 #ifndef DISABLE_PRDR
4353 if(!smtp_reply || prdr_requested)
4358 log_write(0, LOG_MAIN |
4359 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4360 (LOGGING(received_sender) ? LOG_SENDER : 0),
4363 /* Log any control actions taken by an ACL or local_scan(). */
4365 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4366 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4367 "no immediate delivery: queued%s%s by %s",
4368 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4371 f.receive_call_bombout = FALSE;
4373 /* The store for the main log message can be reused */
4374 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4376 /* If the message is frozen, and freeze_tell is set, do the telling. */
4378 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4379 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4380 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4381 message_id, frozen_by, sender_address);
4384 /* Either a message has been successfully received and written to the two spool
4385 files, or an error in writing the spool has occurred for an SMTP message, or
4386 an SMTP message has been rejected for policy reasons, or a message was passed on
4387 by cutthrough delivery. (For a non-SMTP message we will have already given up
4388 because there's no point in carrying on!) For non-cutthrough we must now close
4389 (and thereby unlock) the data file. In the successful case, this leaves the
4390 message on the spool, ready for delivery. In the error case, the spool file will
4391 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4394 For cutthrough we hold the data file locked until we have deleted it, otherwise
4395 a queue-runner could grab it in the window.
4397 A fflush() was done earlier in the expectation that any write errors on the
4398 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4399 possible for fclose() to fail - and this has been seen on obscure filesystems
4400 (probably one that delayed the actual media write as long as possible)
4401 but what to do? What has happened to the lock if this happens?
4402 It's a mess because we already logged the acceptance.
4403 We can at least log the issue, try to remove spoolfiles and respond with
4404 a temp-reject. We do not want to close before logging acceptance because
4405 we want to hold the lock until we know that logging worked.
4406 Could we make this less likely by doing an fdatasync() just after the fflush()?
4407 That seems like a good thing on data-security grounds, but how much will it hit
4414 message_id[0] = 0; /* Indicate no message accepted */
4417 process_info[process_info_len] = 0; /* Remove message id */
4418 if (spool_data_file && cutthrough_done == NOT_TRIED)
4420 if (fclose(spool_data_file)) /* Frees the lock */
4422 log_msg = string_sprintf("spoolfile error on close: %s", strerror(errno));
4423 log_write(0, LOG_MAIN|LOG_PANIC |
4424 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4425 (LOGGING(received_sender) ? LOG_SENDER : 0),
4427 log_write(0, LOG_MAIN |
4428 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4429 (LOGGING(received_sender) ? LOG_SENDER : 0),
4430 "rescind the above message-accept");
4432 Uunlink(spool_name);
4433 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4434 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4436 /* Claim a data ACL temp-reject, just to get reject logging and response */
4437 if (smtp_input) smtp_handle_acl_fail(ACL_WHERE_DATA, rc, NULL, log_msg);
4438 smtp_reply = US""; /* Indicate reply already sent */
4440 message_id[0] = 0; /* no message accepted */
4442 spool_data_file = NULL;
4445 /* Now reset signal handlers to their defaults */
4447 signal(SIGTERM, SIG_DFL);
4448 signal(SIGINT, SIG_DFL);
4450 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4451 value, which defaults TRUE - meaning there may be more incoming messages from
4452 this connection. For non-SMTP callers (where there is only ever one message),
4453 the default is FALSE. */
4459 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4460 is set to the response that should be sent. When it is NULL, we generate
4461 default responses. After an ACL error or local_scan() error, the response has
4462 already been sent, and smtp_reply is an empty string to indicate this. */
4464 if (!smtp_batched_input)
4468 if (fake_response != OK)
4469 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4470 3, SR_FINAL, fake_response_text);
4472 /* An OK response is required; use "message" text if present. */
4476 uschar *code = US"250";
4478 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4479 smtp_respond(code, len, SR_FINAL, user_msg);
4482 /* Default OK response */
4484 else if (chunking_state > CHUNKING_OFFERED)
4486 /* If there is more input waiting, no need to flush (probably the client
4487 pipelined QUIT after data). We check only the in-process buffer, not
4490 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4492 chunking_datasize, message_size+message_linecount, message_id);
4493 chunking_state = CHUNKING_OFFERED;
4496 smtp_printf("250 OK id=%s\r\n", receive_hasc(), message_id);
4500 "\n**** SMTP testing: that is not a real message id!\n\n");
4503 /* smtp_reply is set non-empty */
4505 else if (smtp_reply[0] != 0)
4506 if (fake_response != OK && smtp_reply[0] == '2')
4507 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4508 3, SR_FINAL, fake_response_text);
4510 smtp_printf("%.1024s\r\n", SP_NO_MORE, smtp_reply);
4512 switch (cutthrough_done)
4515 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4517 /* Delete spool files */
4518 Uunlink(spool_name);
4519 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4520 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4524 if (cutthrough.defer_pass)
4526 Uunlink(spool_name);
4527 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4528 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4533 if (cutthrough_done != NOT_TRIED)
4535 if (spool_data_file)
4537 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4538 spool_data_file = NULL;
4540 message_id[0] = 0; /* Prevent a delivery from starting */
4541 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4542 cutthrough.defer_pass = FALSE;
4546 /* For batched SMTP, generate an error message on failure, and do
4547 nothing on success. The function moan_smtp_batch() does not return -
4548 it exits from the program with a non-zero return code. */
4550 else if (smtp_reply)
4551 moan_smtp_batch(NULL, "%s", smtp_reply);
4555 /* If blackholing, we can immediately log this message's sad fate. The data
4556 file has already been unlinked, and the header file was never written to disk.
4557 We must now indicate that nothing was received, to prevent a delivery from
4562 const uschar *detail =
4563 #ifdef HAVE_LOCAL_SCAN
4564 local_scan_data ? string_printing(local_scan_data) :
4566 string_sprintf("(%s discarded recipients)", blackholed_by);
4567 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4568 log_write(0, LOG_MAIN, "Completed");
4572 /* Reset headers so that logging of rejects for a subsequent message doesn't
4573 include them. It is also important to set header_last = NULL before exiting
4574 from this function, as this prevents certain rewrites that might happen during
4575 subsequent verifying (of another incoming message) from trying to add headers
4576 when they shouldn't. */
4578 header_list = header_last = NULL;
4580 return yield; /* TRUE if more messages (SMTP only) */
4583 /* End of receive.c */
4584 /* vi: se aw ai sw=2