1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) The Exim Maintainers 2020 - 2023 */
6 /* Copyright (c) University of Cambridge 1995 - 2018 */
7 /* See the file NOTICE for conditions of use and distribution. */
8 /* SPDX-License-Identifier: GPL-2.0-or-later */
10 /* Code for receiving a message and setting up spool files. */
15 #ifdef EXPERIMENTAL_DCC
23 /*************************************************
24 * Local static variables *
25 *************************************************/
27 static int data_fd = -1;
28 static uschar *spool_name = US"";
30 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
32 #ifdef HAVE_LOCAL_SCAN
33 jmp_buf local_scan_env; /* error-handling context for local_scan */
34 unsigned had_local_scan_crash;
35 unsigned had_local_scan_timeout;
39 /*************************************************
40 * Non-SMTP character reading functions *
41 *************************************************/
43 /* These are the default functions that are set up in the variables such as
44 receive_getc initially. They just call the standard functions, passing stdin as
45 the file. (When SMTP input is occurring, different functions are used by
46 changing the pointer variables.) */
48 uschar stdin_buf[4096];
49 uschar * stdin_inptr = stdin_buf;
50 uschar * stdin_inend = stdin_buf;
55 size_t rc = fread(stdin_buf, 1, sizeof(stdin_buf), stdin);
60 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
61 log_write(L_lost_incoming_connection,
62 LOG_MAIN, "timed out while reading local message");
63 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
67 if (filter_test == FTEST_NONE)
69 fprintf(stderr, "\nexim: %s received - message abandoned\n",
70 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
71 log_write(0, LOG_MAIN, "%s received while reading local message",
72 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
74 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
78 stdin_inend = stdin_buf + rc;
79 stdin_inptr = stdin_buf;
84 stdin_getc(unsigned lim)
86 if (stdin_inptr >= stdin_inend)
89 return *stdin_inptr++;
96 return stdin_inptr < stdin_inend;
102 if (stdin_inptr <= stdin_buf)
103 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "buffer underflow in stdin_ungetc");
112 return stdin_hasc() ? FALSE : feof(stdin);
118 return ferror(stdin);
124 /*************************************************
125 * Check that a set sender is allowed *
126 *************************************************/
128 /* This function is called when a local caller sets an explicit sender address.
129 It checks whether this is permitted, which it is for trusted callers.
130 Otherwise, it must match the pattern(s) in untrusted_set_sender.
132 Arguments: the proposed sender address
133 Returns: TRUE for a trusted caller
134 TRUE if the address has been set, untrusted_set_sender has been
135 set, and the address matches something in the list
140 receive_check_set_sender(const uschar * newsender)
142 const uschar * qnewsender;
143 if (f.trusted_caller) return TRUE;
144 if (!newsender || !untrusted_set_sender) return FALSE;
145 qnewsender = Ustrchr(newsender, '@')
146 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
147 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
153 /*************************************************
154 * Read space info for a partition *
155 *************************************************/
157 /* This function is called by receive_check_fs() below, and also by string
158 expansion for variables such as $spool_space. The field names for the statvfs
159 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
160 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
161 have inodes, and they return -1 for the number available.
163 Later: It turns out that some file systems that do not have the concept of
164 inodes return 0 rather than -1. Such systems should also return 0 for the total
165 number of inodes, so we require that to be greater than zero before returning
169 isspool TRUE for spool partition, FALSE for log partition
170 inodeptr address of int to receive inode count; -1 if there isn't one
172 Returns: available on-root space, in kilobytes
173 -1 for log partition if there isn't one
175 All values are -1 if the STATFS functions are not available.
179 receive_statvfs(BOOL isspool, int *inodeptr)
182 struct STATVFS statbuf;
188 /* The spool directory must always exist. */
192 path = spool_directory;
196 /* Need to cut down the log file path to the directory, and to ignore any
197 appearance of "syslog" in it. */
201 int sep = ':'; /* Not variable - outside scripts use */
202 const uschar *p = log_file_path;
205 /* An empty log_file_path means "use the default". This is the same as an
206 empty item in a list. */
208 if (*p == 0) p = US":";
209 /* should never be a tainted list */
210 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
211 if (Ustrcmp(path, "syslog") != 0)
214 if (path == NULL) /* No log files */
220 /* An empty string means use the default, which is in the spool directory.
221 But don't just use the spool directory, as it is possible that the log
222 subdirectory has been symbolically linked elsewhere. */
226 sprintf(CS buffer, CS"%s/log", CS spool_directory);
232 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
236 /* We now have the path; do the business */
238 memset(&statbuf, 0, sizeof(statbuf));
240 if (STATVFS(CS path, &statbuf) != 0)
241 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
242 { /* Can happen on first run after installation */
248 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
249 "%s directory %s: %s", name, path, strerror(errno));
250 smtp_closedown(US"spool or log directory problem");
251 exim_exit(EXIT_FAILURE);
254 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
256 /* Disks are getting huge. Take care with computing the size in kilobytes. */
258 return (int_eximarith_t)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
261 /* Unable to find partition sizes in this environment. */
271 /*************************************************
272 * Check space on spool and log partitions *
273 *************************************************/
275 /* This function is called before accepting a message; if any thresholds are
276 set, it checks them. If a message_size is supplied, it checks that there is
277 enough space for that size plus the threshold - i.e. that the message won't
278 reduce the space to the threshold. Not all OS have statvfs(); for those that
279 don't, this function always returns TRUE. For some OS the old function and
280 struct name statfs is used; that is handled by a macro, defined in exim.h.
283 msg_size the (estimated) size of an incoming message
285 Returns: FALSE if there isn't enough space, or if the information cannot
287 TRUE if no check was done or there is enough space
291 receive_check_fs(int msg_size)
293 int_eximarith_t space;
296 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
298 space = receive_statvfs(TRUE, &inodes);
301 debug_printf("spool directory space = " PR_EXIM_ARITH "K inodes = %d "
302 "check_space = " PR_EXIM_ARITH "K inodes = %d msg_size = %d\n",
303 space, inodes, check_spool_space, check_spool_inodes, msg_size);
305 if ( space >= 0 && space + msg_size / 1024 < check_spool_space
306 || inodes >= 0 && inodes < check_spool_inodes)
308 log_write(0, LOG_MAIN, "spool directory space check failed: space="
309 PR_EXIM_ARITH " inodes=%d", space, inodes);
314 if (check_log_space > 0 || check_log_inodes > 0)
316 space = receive_statvfs(FALSE, &inodes);
319 debug_printf("log directory space = " PR_EXIM_ARITH "K inodes = %d "
320 "check_space = " PR_EXIM_ARITH "K inodes = %d\n",
321 space, inodes, check_log_space, check_log_inodes);
323 if ( space >= 0 && space < check_log_space
324 || inodes >= 0 && inodes < check_log_inodes)
326 log_write(0, LOG_MAIN, "log directory space check failed: space=" PR_EXIM_ARITH
327 " inodes=%d", space, inodes);
337 /*************************************************
338 * Bomb out while reading a message *
339 *************************************************/
341 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
342 received, or if there is a timeout. A rarer case might be if the log files are
343 screwed up and Exim can't open them to record a message's arrival. Handling
344 that case is done by setting a flag to cause the log functions to call this
345 function if there is an ultimate disaster. That is why it is globally
349 reason text reason to pass to the not-quit ACL
350 msg default SMTP response to give if in an SMTP session
355 receive_bomb_out(uschar *reason, uschar *msg)
357 static BOOL already_bombing_out;
358 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
359 timeouts, if someone has something slow in their quit ACL. Since the only
360 things we should be doing are to close down cleanly ASAP, on the second
361 pass we also close down stuff that might be opened again, before bypassing
362 the ACL call and exiting. */
364 /* If spool_name is set, it contains the name of the data file that is being
365 written. Unlink it before closing so that it cannot be picked up by a delivery
366 process. Ensure that any header file is also removed. */
368 if (spool_name[0] != '\0')
371 spool_name[Ustrlen(spool_name) - 1] = 'H';
373 spool_name[0] = '\0';
376 /* Now close the file if it is open, either as a fd or a stream. */
380 (void)fclose(spool_data_file);
381 spool_data_file = NULL;
383 else if (data_fd >= 0)
385 (void)close(data_fd);
389 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
390 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
393 if (!already_bombing_out)
395 already_bombing_out = TRUE;
398 if (smtp_batched_input)
399 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
400 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
401 smtp_active_hostname, msg);
405 /* Exit from the program (non-BSMTP cases) */
407 exim_exit(EXIT_FAILURE);
411 /*************************************************
412 * Data read timeout *
413 *************************************************/
415 /* Handler function for timeouts that occur while reading the data that
418 Argument: the signal number
423 data_timeout_handler(int sig)
425 had_data_timeout = sig;
430 #ifdef HAVE_LOCAL_SCAN
431 /*************************************************
432 * local_scan() timeout *
433 *************************************************/
435 /* Handler function for timeouts that occur while running a local_scan()
436 function. Posix recommends against calling longjmp() from a signal-handler,
437 but the GCC manual says you can so we will, and trust that it's better than
438 calling probably non-signal-safe funxtions during logging from within the
439 handler, even with other compilers.
441 See also https://cwe.mitre.org/data/definitions/745.html which also lists
444 This is all because we have no control over what might be written for a
445 local-scan function, so cannot sprinkle had-signal checks after each
446 call-site. At least with the default "do-nothing" function we won't
449 Argument: the signal number
454 local_scan_timeout_handler(int sig)
456 had_local_scan_timeout = sig;
457 siglongjmp(local_scan_env, 1);
462 /*************************************************
463 * local_scan() crashed *
464 *************************************************/
466 /* Handler function for signals that occur while running a local_scan()
469 Argument: the signal number
474 local_scan_crash_handler(int sig)
476 had_local_scan_crash = sig;
477 siglongjmp(local_scan_env, 1);
480 #endif /*HAVE_LOCAL_SCAN*/
483 /*************************************************
484 * SIGTERM or SIGINT received *
485 *************************************************/
487 /* Handler for SIGTERM or SIGINT signals that occur while reading the
488 data that comprises a message.
490 Argument: the signal number
495 data_sigterm_sigint_handler(int sig)
497 had_data_sigint = sig;
502 /*************************************************
503 * Add new recipient to list *
504 *************************************************/
506 /* This function builds a list of recipient addresses in argc/argv
510 recipient the next address to add to recipients_list
511 pno parent number for fixed aliases; -1 otherwise
517 receive_add_recipient(const uschar * recipient, int pno)
519 if (recipients_count >= recipients_list_max)
521 recipient_item *oldlist = recipients_list;
522 int oldmax = recipients_list_max;
524 const int safe_recipients_limit = INT_MAX / 2 / sizeof(recipient_item);
525 if (recipients_list_max < 0 || recipients_list_max >= safe_recipients_limit)
527 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Too many recipients: %d", recipients_list_max);
530 recipients_list_max = recipients_list_max ? 2*recipients_list_max : 50;
531 recipients_list = store_get(recipients_list_max * sizeof(recipient_item), GET_UNTAINTED);
533 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
536 recipients_list[recipients_count].address = recipient;
537 recipients_list[recipients_count].pno = pno;
538 #ifdef EXPERIMENTAL_BRIGHTMAIL
539 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
540 /* reset optin string pointer for next recipient */
541 bmi_current_optin = NULL;
543 recipients_list[recipients_count].orcpt = NULL;
544 recipients_list[recipients_count].dsn_flags = 0;
545 recipients_list[recipients_count++].errors_to = NULL;
551 /*************************************************
552 * Send user response message *
553 *************************************************/
555 /* This function is passed a default response code and a user message. It calls
556 smtp_message_code() to check and possibly modify the response code, and then
557 calls smtp_respond() to transmit the response. I put this into a function
558 just to avoid a lot of repetition.
561 code the response code
562 user_msg the user message
569 smtp_user_msg(uschar *code, uschar *user_msg)
572 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
573 smtp_respond(code, len, SR_FINAL, user_msg);
581 /*************************************************
582 * Remove a recipient from the list *
583 *************************************************/
585 /* This function is provided for local_scan() to use.
588 recipient address to remove
590 Returns: TRUE if it did remove something; FALSE otherwise
594 receive_remove_recipient(const uschar * recipient)
596 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
598 for (int count = 0; count < recipients_count; count++)
599 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
601 if ((--recipients_count - count) > 0)
602 memmove(recipients_list + count, recipients_list + count + 1,
603 (recipients_count - count)*sizeof(recipient_item));
613 /* Pause for a while waiting for input. If none received in that time,
614 close the logfile, if we had one open; then if we wait for a long-running
615 datasource (months, in one use-case) log rotation will not leave us holding
621 if (!receive_timeout && !receive_hasc())
624 timesince(&t, &received_time);
625 if (t.tv_sec > 30*60)
628 if (poll_one_fd(0, POLLIN, (30*60 - t.tv_sec) * 1000) == 0)
633 /*************************************************
634 * Read data portion of a non-SMTP message *
635 *************************************************/
637 /* This function is called to read the remainder of a message (following the
638 header) when the input is not from SMTP - we are receiving a local message on
639 a standard input stream. The message is always terminated by EOF, and is also
640 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
641 two cases for maximum efficiency.
643 Ensure that the body ends with a newline. This will naturally be the case when
644 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
645 as "sequences of lines" - this of course strictly applies only to SMTP, but
646 deliveries into BSD-type mailbox files also require it. Exim used to have a
647 flag for doing this at delivery time, but as it was always set for all
648 transports, I decided to simplify things by putting the check here instead.
650 There is at least one MUA (dtmail) that sends CRLF via this interface, and
651 other programs are known to do this as well. Exim used to have a option for
652 dealing with this: in July 2003, after much discussion, the code has been
653 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
655 However, for the case when a dot on a line by itself terminates a message, the
656 only recognized terminating sequences before and after the dot are LF and CRLF.
657 Otherwise, having read EOL . CR, you don't know whether to read another
660 Internally, in messages stored in Exim's spool files, LF is used as the line
661 terminator. Under the new regime, bare CRs will no longer appear in these
665 fout a FILE to which to write the message
667 Returns: One of the END_xxx values indicating why it stopped reading
671 read_message_data(FILE *fout)
675 register int linelength = 0;
677 /* Handle the case when only EOF terminates the message */
684 log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF;
687 if (ch == 0) body_zerocount++;
688 if (last_ch == '\r' && ch != '\n')
690 if (linelength > max_received_linelength)
691 max_received_linelength = linelength;
693 if (fputc('\n', fout) == EOF) return END_WERROR;
697 if (ch == '\r') continue;
699 if (fputc(ch, fout) == EOF) return END_WERROR;
702 if (linelength > max_received_linelength)
703 max_received_linelength = linelength;
708 if (++message_size > thismessage_size_limit) return END_SIZE;
713 if (linelength > max_received_linelength)
714 max_received_linelength = linelength;
715 if (fputc('\n', fout) == EOF) return END_WERROR;
723 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
727 while (log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
729 if (ch == 0) body_zerocount++;
732 case 0: /* Normal state (previous char written) */
736 if (linelength > max_received_linelength)
737 max_received_linelength = linelength;
742 { ch_state = 2; continue; }
745 case 1: /* After written "\n" */
746 if (ch == '.') { ch_state = 3; continue; }
747 if (ch == '\r') { ch_state = 2; continue; }
748 if (ch == '\n') { body_linecount++; linelength = -1; }
753 body_linecount++; /* After unwritten "\r" */
754 if (linelength > max_received_linelength)
755 max_received_linelength = linelength;
763 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
764 if (ch == '\r') continue;
770 case 3: /* After "\n." (\n written, dot not) */
771 if (ch == '\n') return END_DOT;
772 if (ch == '\r') { ch_state = 4; continue; }
775 if (fputc('.', fout) == EOF) return END_WERROR;
779 case 4: /* After "\n.\r" (\n written, rest not) */
780 if (ch == '\n') return END_DOT;
783 if (fputs(".\n", fout) == EOF) return END_WERROR;
784 if (ch == '\r') { ch_state = 2; continue; }
790 if (fputc(ch, fout) == EOF) return END_WERROR;
791 if (++message_size > thismessage_size_limit) return END_SIZE;
794 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
795 the message ends with a newline, and we must also write any characters that
796 were saved up while testing for an ending dot. */
800 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
801 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
802 message_size += Ustrlen(ends[ch_state]);
812 /*************************************************
813 * Read data portion of an SMTP message *
814 *************************************************/
816 /* This function is called to read the remainder of an SMTP message (after the
817 headers), or to skip over it when an error has occurred. In this case, the
818 output file is passed as NULL.
820 If any line begins with a dot, that character is skipped. The input should only
821 be successfully terminated by CR LF . CR LF unless it is local (non-network)
822 SMTP, in which case the CRs are optional, but...
824 FUDGE: It seems that sites on the net send out messages with just LF
825 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
826 we make the CRs optional in all cases.
828 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
829 well, so that there are no CRs in spooled messages. However, the message
830 terminating dot is not recognized between two bare CRs.
832 Dec 2023: getting a site to send a body including an "LF . LF" sequence
833 followed by SMTP commands is a possible "smtp smuggling" attack. If
834 the first (header) line for the message has a proper CRLF then enforce
835 that for the body: convert bare LF to a space.
838 fout a FILE to which to write the message; NULL if skipping
839 strict_crlf require full CRLF sequence as a line ending
841 Returns: One of the END_xxx values indicating why it stopped reading
845 read_message_data_smtp(FILE * fout, BOOL strict_crlf)
847 enum { s_linestart, s_normal, s_had_cr, s_had_nl_dot, s_had_dot_cr } ch_state =
849 int linelength = 0, ch;
851 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
853 if (ch == 0) body_zerocount++;
856 case s_linestart: /* After LF or CRLF */
859 ch_state = s_had_nl_dot;
860 continue; /* Don't ever write . after LF */
864 /* Else fall through to handle as normal uschar. */
866 case s_normal: /* Normal state */
870 continue; /* Don't write the CR */
872 if (ch == '\n') /* Bare LF at end of line */
874 ch = ' '; /* replace LF with space */
876 { /* treat as line ending */
877 ch_state = s_linestart;
879 if (linelength > max_received_linelength)
880 max_received_linelength = linelength;
885 case s_had_cr: /* After (unwritten) CR */
886 body_linecount++; /* Any char ends line */
887 if (linelength > max_received_linelength)
888 max_received_linelength = linelength;
890 if (ch == '\n') /* proper CRLF */
891 ch_state = s_linestart;
894 message_size++; /* convert the dropped CR to a stored NL */
895 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
896 cutthrough_data_put_nl();
897 if (ch == '\r') /* CR; do not write */
899 ch_state = s_normal; /* not LF or CR; process as standard */
903 case s_had_nl_dot: /* After [CR] LF . */
904 if (ch == '\n') /* [CR] LF . LF */
906 ch = ' '; /* replace LF with space */
909 else if (ch == '\r') /* [CR] LF . CR */
911 ch_state = s_had_dot_cr;
912 continue; /* Don't write the CR */
914 /* The dot was removed on reaching s_had_nl_dot. For a doubled dot, here,
915 reinstate it to cutthrough. The current ch, dot or not, is passed both to
916 cutthrough and to file below. */
920 cutthrough_data_puts(&c, 1);
925 case s_had_dot_cr: /* After [CR] LF . CR */
927 return END_DOT; /* Preferred termination */
929 message_size++; /* convert the dropped CR to a stored NL */
931 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
932 cutthrough_data_put_nl();
936 continue; /* CR; do not write */
942 /* Add the character to the spool file, unless skipping; then loop for the
949 if (fputc(ch, fout) == EOF) return END_WERROR;
950 if (message_size > thismessage_size_limit) return END_SIZE;
953 cutthrough_data_put_nl();
957 cutthrough_data_puts(&c, 1);
961 /* Fall through here if EOF encountered. This indicates some kind of error,
962 since a correct message is terminated by [CR] LF . [CR] LF. */
970 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
971 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
972 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
973 body_linecount accounting for proper re-expansion for the wire, so use
974 a cut-down version of the state-machine above; we don't need to do leading-dot
975 detection and unstuffing.
978 fout a FILE to which to write the message; NULL if skipping;
979 must be open for both writing and reading.
981 Returns: One of the END_xxx values indicating why it stopped reading
985 read_message_bdat_smtp(FILE * fout)
987 int linelength = 0, ch;
988 enum CH_STATE ch_state = LF_SEEN;
993 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
995 case EOF: return END_EOF;
996 case ERR: return END_PROTOCOL;
998 /* Nothing to get from the sender anymore. We check the last
999 character written to the spool.
1001 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
1002 If we would be strict, we would refuse such broken messages.
1003 But we are liberal, so we fix it. It would be easy just to append
1004 the "\n" to the spool.
1006 But there are some more things (line counting, message size calculation and such),
1007 that would need to be duplicated here. So we simply do some ungetc
1012 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
1013 if (fgetc(fout) == '\n') return END_DOT;
1016 if (linelength == -1) /* \r already seen (see below) */
1018 DEBUG(D_receive) debug_printf("Add missing LF\n");
1022 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
1023 bdat_ungetc('\r'); /* not even \r was seen */
1027 case '\0': body_zerocount++; break;
1031 case LF_SEEN: /* After LF or CRLF */
1032 ch_state = MID_LINE;
1033 /* fall through to handle as normal uschar. */
1035 case MID_LINE: /* Mid-line state */
1040 if (linelength > max_received_linelength)
1041 max_received_linelength = linelength;
1044 else if (ch == '\r')
1047 if (fix_nl) bdat_ungetc('\n');
1048 continue; /* don't write CR */
1052 case CR_SEEN: /* After (unwritten) CR */
1054 if (linelength > max_received_linelength)
1055 max_received_linelength = linelength;
1062 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
1063 cutthrough_data_put_nl();
1064 if (ch == '\r') continue; /* don't write CR */
1065 ch_state = MID_LINE;
1070 /* Add the character to the spool file, unless skipping */
1076 if (fputc(ch, fout) == EOF) return END_WERROR;
1077 if (message_size > thismessage_size_limit) return END_SIZE;
1080 cutthrough_data_put_nl();
1084 cutthrough_data_puts(&c, 1);
1091 read_message_bdat_smtp_wire(FILE * fout)
1095 /* Remember that this message uses wireformat. */
1097 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1098 fout ? "writing spoolfile in wire format" : "flushing input");
1099 f.spool_file_wireformat = TRUE;
1103 if (chunking_data_left > 0)
1105 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1106 uschar * buf = bdat_getbuf(&len);
1108 if (!buf) return END_EOF;
1109 message_size += len;
1110 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1112 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1114 case EOF: return END_EOF;
1115 case EOD: return END_DOT;
1116 case ERR: return END_PROTOCOL;
1122 max_received_linelength
1126 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1129 if (message_size > thismessage_size_limit) return END_SIZE;
1137 /*************************************************
1138 * Swallow SMTP message *
1139 *************************************************/
1141 /* This function is called when there has been some kind of error while reading
1142 an SMTP message, and the remaining data may need to be swallowed. It is global
1143 because it is called from smtp_closedown() to shut down an incoming call
1146 Argument: a FILE from which to read the message
1151 receive_swallow_smtp(void)
1153 if (message_ended >= END_NOTENDED)
1154 message_ended = chunking_state <= CHUNKING_OFFERED
1155 ? read_message_data_smtp(NULL, FALSE)
1156 : read_message_bdat_smtp_wire(NULL);
1161 /*************************************************
1162 * Handle lost SMTP connection *
1163 *************************************************/
1165 /* This function logs connection loss incidents and generates an appropriate
1168 Argument: additional data for the message
1169 Returns: the SMTP response
1173 handle_lost_connection(uschar * s)
1175 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1176 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1177 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1178 return US"421 Lost incoming connection";
1184 /*************************************************
1185 * Handle a non-smtp reception error *
1186 *************************************************/
1188 /* This function is called for various errors during the reception of non-SMTP
1189 messages. It either sends a message to the sender of the problem message, or it
1190 writes to the standard error stream.
1193 errcode code for moan_to_sender(), identifying the error
1194 text1 first message text, passed to moan_to_sender()
1195 text2 second message text, used only for stderrr
1196 error_rc code to pass to exim_exit if no problem
1197 f FILE containing body of message (may be stdin)
1198 hptr pointer to instore headers or NULL
1200 Returns: calls exim_exit(), which does not return
1204 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1205 FILE *f, header_line *hptr)
1207 DEBUG(D_all) debug_printf("%s%s\n", text2, text1);
1209 if (error_handling == ERRORS_SENDER)
1213 eblock.text1 = text1;
1214 eblock.text2 = US"";
1215 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1216 error_rc = EXIT_FAILURE;
1219 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1221 exim_exit(error_rc);
1226 /*************************************************
1227 * Add header lines set up by ACL *
1228 *************************************************/
1230 /* This function is called to add the header lines that were set up by
1231 statements in an ACL to the list of headers in memory. It is done in two stages
1232 like this, because when the ACL for RCPT is running, the other headers have not
1233 yet been received. This function is called twice; once just before running the
1234 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1235 are visible to the DATA ACL.
1237 Originally these header lines were added at the end. Now there is support for
1238 three different places: top, bottom, and after the Received: header(s). There
1239 will always be at least one Received: header, even if it is marked deleted, and
1240 even if something else has been put in front of it.
1243 acl_name text to identify which ACL
1249 add_acl_headers(int where, uschar * acl_name)
1251 header_line * last_received = NULL;
1255 case ACL_WHERE_DKIM:
1256 case ACL_WHERE_MIME:
1257 case ACL_WHERE_DATA:
1258 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1259 && (acl_removed_headers || acl_added_headers))
1261 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1262 " will not take effect on cutthrough deliveries");
1267 if (acl_removed_headers)
1269 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1271 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1273 const uschar * list = acl_removed_headers, * s;
1274 int sep = ':'; /* This is specified as a colon-separated list */
1276 /* If a list element has a leading '^' then it is an RE for
1277 the whole header, else just a header name. */
1278 while ((s = string_nextinlist(&list, &sep, NULL, 0)))
1281 regex_must_compile(s, MCS_CACHEABLE, FALSE),
1282 h->text, h->slen, NULL)
1284 || header_testname(h, s, Ustrlen(s), FALSE)
1287 h->type = htype_old;
1288 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1291 acl_removed_headers = NULL;
1292 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1295 if (!acl_added_headers) return;
1296 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1298 for (header_line * h = acl_added_headers, * next; h; h = next)
1305 h->next = header_list;
1307 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1313 last_received = header_list;
1314 while (!header_testname(last_received, US"Received", 8, FALSE))
1315 last_received = last_received->next;
1316 while (last_received->next &&
1317 header_testname(last_received->next, US"Received", 8, FALSE))
1318 last_received = last_received->next;
1320 h->next = last_received->next;
1321 last_received->next = h;
1322 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1326 /* add header before any header which is NOT Received: or Resent- */
1327 last_received = header_list;
1328 while ( last_received->next &&
1329 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1330 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1331 last_received = last_received->next;
1332 /* last_received now points to the last Received: or Resent-* header
1333 in an uninterrupted chain of those header types (seen from the beginning
1334 of all headers. Our current header must follow it. */
1335 h->next = last_received->next;
1336 last_received->next = h;
1337 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1342 header_last->next = h;
1343 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1347 if (!h->next) header_last = h;
1349 /* Check for one of the known header types (From:, To:, etc.) though in
1350 practice most added headers are going to be "other". Lower case
1351 identification letters are never stored with the header; they are used
1352 for existence tests when messages are received. So discard any lower case
1355 h->type = header_checkname(h, FALSE);
1356 if (h->type >= 'a') h->type = htype_other;
1358 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1361 acl_added_headers = NULL;
1362 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1367 /*************************************************
1368 * Add host information for log line *
1369 *************************************************/
1371 /* Called for acceptance and rejecting log lines. This adds information about
1372 the calling host to a string that is being built dynamically.
1375 s the dynamic string
1377 Returns: the extended string
1381 add_host_info_for_log(gstring * g)
1383 if (sender_fullhost)
1385 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1386 g = string_catn(g, US" DS", 3);
1387 g = string_append(g, 2, US" H=", sender_fullhost);
1388 if (LOGGING(incoming_interface) && interface_address)
1389 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1391 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1393 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1394 f.tcp_in_fastopen_logged = TRUE;
1397 g = string_append(g, 2, US" U=", sender_ident);
1398 if (LOGGING(connection_id))
1399 g = string_fmt_append(g, " Ci=%lu", connection_id);
1400 if (received_protocol)
1401 g = string_append(g, 2, US" P=", received_protocol);
1402 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1404 g = string_catn(g, US" L", 2);
1405 #ifndef DISABLE_PIPE_CONNECT
1406 if (f.smtp_in_early_pipe_used)
1407 g = string_catn(g, US"*", 1);
1408 else if (f.smtp_in_early_pipe_advertised)
1409 g = string_catn(g, US".", 1);
1411 if (!f.smtp_in_pipelining_used)
1412 g = string_catn(g, US"-", 1);
1419 #ifdef WITH_CONTENT_SCAN
1421 /*************************************************
1422 * Run the MIME ACL on a message *
1423 *************************************************/
1425 /* This code is in a subroutine so that it can be used for both SMTP
1426 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1429 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1430 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1431 smtp_reply_ptr Where SMTP reply is being built
1432 blackholed_by_ptr Where "blackholed by" message is being built
1434 Returns: TRUE to carry on; FALSE to abandon the message
1438 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1439 uschar **blackholed_by_ptr)
1442 uschar * rfc822_file_path = NULL;
1443 unsigned long mbox_size;
1444 uschar *user_msg, *log_msg;
1445 int mime_part_count_buffer = -1;
1446 uschar * mbox_filename;
1449 /* check if it is a MIME message */
1451 for (header_line * my_headerlist = header_list; my_headerlist;
1452 my_headerlist = my_headerlist->next)
1453 if ( my_headerlist->type != '*' /* skip deleted headers */
1454 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1457 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1461 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1466 /* make sure the eml mbox file is spooled up */
1467 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1468 { /* error while spooling */
1469 log_write(0, LOG_MAIN|LOG_PANIC,
1470 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1471 Uunlink(spool_name);
1473 #ifdef EXPERIMENTAL_DCC
1476 smtp_respond(US"451", 3, SR_FINAL, US"temporary local problem");
1477 message_id[0] = 0; /* Indicate no message accepted */
1478 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1479 return FALSE; /* Indicate skip to end of receive function */
1485 mime_part_count = -1;
1486 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1487 (void)fclose(mbox_file);
1489 if (rfc822_file_path)
1491 mime_part_count = mime_part_count_buffer;
1493 if (unlink(CS rfc822_file_path) == -1)
1495 log_write(0, LOG_PANIC,
1496 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1499 rfc822_file_path = NULL;
1502 /* check if we must check any message/rfc822 attachments */
1505 uschar * scandir = string_copyn(mbox_filename,
1506 Ustrrchr(mbox_filename, '/') - mbox_filename);
1507 struct dirent * entry;
1510 for (tempdir = exim_opendir(scandir); entry = readdir(tempdir); )
1511 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1513 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1515 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1521 if (rfc822_file_path)
1523 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1525 /* set RFC822 expansion variable */
1527 mime_part_count_buffer = mime_part_count;
1528 goto MIME_ACL_CHECK;
1530 log_write(0, LOG_PANIC,
1531 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1532 unlink(CS rfc822_file_path);
1537 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1540 recipients_count = 0;
1541 *blackholed_by_ptr = US"MIME ACL";
1542 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1546 Uunlink(spool_name);
1547 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1549 #ifdef EXPERIMENTAL_DCC
1554 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1555 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1556 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1558 message_id[0] = 0; /* Indicate no message accepted */
1559 return FALSE; /* Cause skip to end of receive function */
1565 #endif /* WITH_CONTENT_SCAN */
1570 received_header_gen(void)
1573 uschar * timestamp = expand_string(US"${tod_full}");
1574 header_line * received_header= header_list;
1576 if (recipients_count == 1) received_for = recipients_list[0].address;
1577 received = expand_string(received_header_text);
1578 received_for = NULL;
1582 if(spool_name[0] != 0)
1583 Uunlink(spool_name); /* Lose the data file */
1584 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1585 "(received_header_text) failed: %s", string_printing(received_header_text),
1586 expand_string_message);
1589 /* The first element on the header chain is reserved for the Received header,
1590 so all we have to do is fill in the text pointer, and set the type. However, if
1591 the result of the expansion is an empty string, we leave the header marked as
1592 "old" so as to refrain from adding a Received header. */
1596 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1597 received_header->type = htype_old;
1601 received_header->text = string_sprintf("%s;\n\t%s\n", received, timestamp);
1602 received_header->type = htype_received;
1605 received_header->slen = Ustrlen(received_header->text);
1607 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1608 received_header->type, received_header->text);
1613 /*************************************************
1615 *************************************************/
1617 /* Receive a message on the given input, and put it into a pair of spool files.
1618 Either a non-null list of recipients, or the extract flag will be true, or
1619 both. The flag sender_local is true for locally generated messages. The flag
1620 submission_mode is true if an ACL has obeyed "control = submission". The flag
1621 suppress_local_fixups is true if an ACL has obeyed "control =
1622 suppress_local_fixups" or -G was passed on the command-line.
1623 The flag smtp_input is true if the message is to be
1624 handled using SMTP conventions about termination and lines starting with dots.
1625 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1627 If a message was successfully read, message_id[0] will be non-zero.
1629 The general actions of this function are:
1631 . Read the headers of the message (if any) into a chain of store
1634 . If there is a "sender:" header and the message is locally originated,
1635 throw it away, unless the caller is trusted, or unless
1636 active_local_sender_retain is set - which can only happen if
1637 active_local_from_check is false.
1639 . If recipients are to be extracted from the message, build the
1640 recipients list from the headers, removing any that were on the
1641 original recipients list (unless extract_addresses_remove_arguments is
1642 false), and at the same time, remove any bcc header that may be present.
1644 . Get the spool file for the data, sort out its unique name, open
1645 and lock it (but don't give it the name yet).
1647 . Generate a "Message-Id" header if the message doesn't have one, for
1648 locally-originated messages.
1650 . Generate a "Received" header.
1652 . Ensure the recipients list is fully qualified and rewritten if necessary.
1654 . If there are any rewriting rules, apply them to the sender address
1655 and also to the headers.
1657 . If there is no from: header, generate one, for locally-generated messages
1658 and messages in "submission mode" only.
1660 . If the sender is local, check that from: is correct, and if not, generate
1661 a Sender: header, unless message comes from a trusted caller, or this
1662 feature is disabled by active_local_from_check being false.
1664 . If there is no "date" header, generate one, for locally-originated
1665 or submission mode messages only.
1667 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1668 dot_ends mode, to the data file. Leave it open, to hold the lock.
1670 . Write the envelope and the headers to a new file.
1672 . Set the name for the header file; close it.
1674 . Set the name for the data file; close it.
1676 Because this function can potentially be called many times in a single
1677 SMTP connection, all store should be got by store_get(), so that it will be
1678 automatically retrieved after the message is accepted.
1680 FUDGE: It seems that sites on the net send out messages with just LF
1681 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1682 we make the CRs optional in all cases.
1684 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1685 new regime is now in place in which bare CRs in header lines are turned into LF
1686 followed by a space, so as not to terminate the header line.
1688 February 2004: A bare LF in a header line in a message whose first line was
1689 terminated by CRLF is treated in the same way as a bare CR.
1692 extract_recip TRUE if recipients are to be extracted from the message's
1695 Returns: TRUE there are more messages to be read (SMTP input)
1696 FALSE there are no more messages to be read (non-SMTP input
1697 or SMTP connection collapsed, or other failure)
1699 When reading a message for filter testing, the returned value indicates
1700 whether the headers (which is all that is read) were terminated by '.' or
1704 receive_msg(BOOL extract_recip)
1708 int process_info_len = Ustrlen(process_info);
1709 int error_rc = error_handling == ERRORS_SENDER
1710 ? errors_sender_rc : EXIT_FAILURE;
1711 int header_size = 256;
1713 int prevlines_length = 0;
1714 const int id_resolution = BASE_62 == 62 && !host_number_string ? 1
1715 : BASE_62 != 62 && host_number_string ? 4
1720 BOOL contains_resent_headers = FALSE;
1721 BOOL extracted_ignored = FALSE;
1722 BOOL first_line_ended_crlf = TRUE_UNSET;
1723 BOOL smtp_yield = TRUE;
1726 BOOL resents_exist = FALSE;
1727 uschar *resent_prefix = US"";
1728 uschar *blackholed_by = NULL;
1729 uschar *blackhole_log_msg = US"";
1730 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1733 error_block *bad_addresses = NULL;
1735 uschar *frozen_by = NULL;
1736 uschar *queued_by = NULL;
1739 rmark rcvd_log_reset_point;
1741 struct stat statbuf;
1743 /* Final message to give to SMTP caller, and messages from ACLs */
1745 uschar *smtp_reply = NULL;
1746 uschar *user_msg, *log_msg;
1748 /* Working header pointers */
1753 /* Flags for noting the existence of certain headers (only one left) */
1755 BOOL date_header_exists = FALSE;
1757 /* Pointers to receive the addresses of headers whose contents we need. */
1759 header_line *from_header = NULL;
1760 header_line *subject_header = NULL;
1761 header_line *msgid_header = NULL;
1762 header_line *received_header;
1763 BOOL msgid_header_newly_created = FALSE;
1765 /* Variables for use when building the Received: header. */
1770 /* Time of creation of message_id */
1772 static struct timeval message_id_tv = { 0, 0 };
1775 /* Release any open files that might have been cached while preparing to
1776 accept the message - e.g. by verifying addresses - because reading a message
1777 might take a fair bit of real time. */
1781 /* Extracting the recipient list from an input file is incompatible with
1782 cutthrough delivery with the no-spool option. It shouldn't be possible
1783 to set up the combination, but just in case kill any ongoing connection. */
1784 if (extract_recip || !smtp_input)
1785 cancel_cutthrough_connection(TRUE, US"not smtp input");
1787 /* Initialize the chain of headers by setting up a place-holder for Received:
1788 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1789 pointing to the end of the chain to make adding headers simple. */
1791 received_header = header_list = header_last = store_get(sizeof(header_line), GET_UNTAINTED);
1792 header_list->next = NULL;
1793 header_list->type = htype_old;
1794 header_list->text = NULL;
1795 header_list->slen = 0;
1797 /* Control block for the next header to be read.
1798 The data comes from the message, so is tainted. */
1800 reset_point = store_mark();
1801 next = store_get(sizeof(header_line), GET_UNTAINTED);
1802 next->text = store_get(header_size, GET_TAINTED);
1804 /* Initialize message id to be null (indicating no message read), and the
1805 header names list to be the normal list. Indicate there is no data file open
1806 yet, initialize the size and warning count, and deal with no size limit. */
1809 spool_data_file = NULL;
1814 received_count = 1; /* For the one we will add */
1816 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1818 /* While reading the message, the following counts are computed. */
1820 message_linecount = body_linecount = body_zerocount =
1821 max_received_linelength = 0;
1823 #ifdef WITH_CONTENT_SCAN
1824 /* reset non-per-part mime variables */
1825 mime_is_coverletter = 0;
1827 mime_part_count = -1;
1830 #ifndef DISABLE_DKIM
1831 /* Call into DKIM to set up the context. In CHUNKING mode
1832 we clear the dot-stuffing flag */
1833 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1834 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1837 #ifdef SUPPORT_DMARC
1838 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1841 /* In SMTP sessions we may receive several messages in one connection. Before
1842 each subsequent one, we wait for the clock to tick at the level of message-id
1844 This is so that the combination of time+pid is unique, even on systems where the
1845 pid can be re-used within our time interval. We can't shorten the interval
1846 without re-designing the message-id. See comments above where the message id is
1847 created. This is Something For The Future.
1848 Do this wait any time we have previously created a message-id, even if we
1849 rejected the message. This gives unique IDs for logging done by ACLs.
1850 The initial timestamp must have been obtained via exim_gettime() to avoid
1851 issues on Linux with suspend/resume. */
1853 if (message_id_tv.tv_sec)
1855 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
1856 exim_wait_tick(&message_id_tv, id_resolution);
1859 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1860 ids, and fractions of a second are required. See the comments that precede the
1861 message id creation below.
1862 We use a routine that if possible uses a monotonic clock, and can be used again
1863 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1866 exim_gettime(&message_id_tv);
1868 /* For other uses of the received time we can operate with granularity of one
1869 second, and for that we use the global variable received_time. This is for
1870 things like ultimate message timeouts.
1871 For this we do not care about the Linux suspend/resume problem, so rather than
1872 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1874 gettimeofday(&received_time, NULL);
1876 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1877 happen in the smtp_getc() function when it refills its buffer. */
1879 had_data_timeout = 0;
1881 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1883 /* If not SMTP input, timeout happens only if configured, and we just set a
1884 single timeout for the whole message. */
1886 else if (receive_timeout > 0)
1888 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1889 ALARM(receive_timeout);
1892 /* SIGTERM and SIGINT are caught always. */
1894 had_data_sigint = 0;
1895 signal(SIGTERM, data_sigterm_sigint_handler);
1896 signal(SIGINT, data_sigterm_sigint_handler);
1898 /* Header lines in messages are not supposed to be very long, though when
1899 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1900 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1901 storing the header, and extend this as necessary using string_cat().
1903 To cope with total lunacies, impose an upper limit on the length of the header
1904 section of the message, as otherwise the store will fill up. We must also cope
1905 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1906 Folded header lines are joined into one string, leaving the '\n' characters
1907 inside them, so that writing them out reproduces the input.
1909 Loop for each character of each header; the next structure for chaining the
1910 header is set up already, with ptr the offset of the next character in
1915 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1917 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1918 SMTP must have a correct "." terminator. */
1920 if (smtp_input /* && !smtp_batched_input */)
1923 smtp_reply = handle_lost_connection(US" (header)");
1925 goto TIDYUP; /* Skip to end of function */
1930 /* See if we are at the current header's size limit - there must be at least
1931 four bytes left. This allows for the new character plus a zero, plus two for
1932 extra insertions when we are playing games with dots and carriage returns. If
1933 we are at the limit, extend the text buffer. This could have been done
1934 automatically using string_cat() but because this is a tightish loop storing
1935 only one character at a time, we choose to do it inline. Normally
1936 store_extend() will be able to extend the block; only at the end of a big
1937 store block will a copy be needed. To handle the case of very long headers
1938 (and sometimes lunatic messages can have ones that are 100s of K long) we
1939 call store_release() for strings that have been copied - if the string is at
1940 the start of a block (and therefore the only thing in it, because we aren't
1941 doing any other gets), the block gets freed. We can only do this release if
1942 there were no allocations since the once that we want to free. */
1944 if (ptr >= header_size - 4)
1946 int oldsize = header_size;
1948 if (header_size >= INT_MAX/2)
1952 if (!store_extend(next->text, oldsize, header_size))
1953 next->text = store_newblock(next->text, header_size, ptr);
1956 /* Cope with receiving a binary zero. There is dispute about whether
1957 these should be allowed in RFC 822 messages. The middle view is that they
1958 should not be allowed in headers, at least. Exim takes this attitude at
1959 the moment. We can't just stomp on them here, because we don't know that
1960 this line is a header yet. Set a flag to cause scanning later. */
1962 if (ch == 0) had_zero++;
1964 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1965 those from data files use just LF. Treat LF in local SMTP input as a
1966 terminator too. Treat EOF as a line terminator always. */
1968 if (ch < 0) goto EOL;
1970 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1971 other MTAs accept this. We are therefore forced into this "liberalisation"
1972 too, so we accept LF as a line terminator whatever the source of the message.
1973 However, if the first line of the message ended with a CRLF, we treat a bare
1974 LF specially by inserting a white space after it to ensure that the header
1975 line is not terminated. */
1979 if (first_line_ended_crlf == TRUE_UNSET)
1980 first_line_ended_crlf = FALSE;
1981 else if (first_line_ended_crlf)
1982 receive_ungetc(' ');
1986 /* This is not the end of the line. If this is SMTP input and this is
1987 the first character in the line and it is a "." character, ignore it.
1988 This implements the dot-doubling rule, though header lines starting with
1989 dots aren't exactly common. They are legal in RFC 822, though. If the
1990 following is CRLF or LF, this is the line that that terminates the
1992 entire message. We set message_ended to indicate this has happened (to
1993 prevent further reading), and break out of the loop, having freed the
1994 empty header, and set next = NULL to indicate no data line. */
1996 if (f.dot_ends && ptr == 0 && ch == '.')
1998 /* leading dot while in headers-read mode */
1999 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2000 if (ch == '\n' && first_line_ended_crlf == TRUE /* and not TRUE_UNSET */ )
2001 /* dot, LF but we are in CRLF mode. Attack? */
2002 ch = ' '; /* replace the LF with a space */
2004 else if (ch == '\r')
2006 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2009 if (ch >= 0) receive_ungetc(ch);
2010 ch = '\r'; /* Revert to CR */
2015 message_ended = END_DOT;
2016 reset_point = store_reset(reset_point);
2018 break; /* End character-reading loop */
2021 /* For non-SMTP input, the dot at the start of the line was really a data
2022 character. What is now in ch is the following character. We guaranteed
2023 enough space for this above. */
2027 next->text[ptr++] = '.';
2032 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
2033 remember this case if this is the first line ending. */
2037 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2040 if (first_line_ended_crlf == TRUE_UNSET)
2041 first_line_ended_crlf = TRUE;
2045 /* Otherwise, put back the character after CR, and turn the bare CR
2048 if (ch >= 0) (receive_ungetc)(ch);
2049 next->text[ptr++] = '\n';
2054 /* We have a data character for the header line. */
2056 next->text[ptr++] = ch; /* Add to buffer */
2057 message_size++; /* Total message size so far */
2059 /* Handle failure due to a humungously long header section. The >= allows
2060 for the terminating \n. Add what we have so far onto the headers list so
2061 that it gets reflected in any error message, and back up the just-read
2064 if (message_size >= header_maxsize)
2067 next->text[ptr] = 0;
2069 next->type = htype_other;
2071 header_last->next = next;
2074 log_write(0, LOG_MAIN, "ridiculously long message header received from "
2075 "%s (more than %d characters): message abandoned",
2076 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
2080 smtp_reply = US"552 Message header is ridiculously long";
2081 receive_swallow_smtp();
2082 goto TIDYUP; /* Skip to end of function */
2087 give_local_error(ERRMESS_VLONGHEADER,
2088 string_sprintf("message header longer than %d characters received: "
2089 "message not accepted", header_maxsize), US"", error_rc, stdin,
2091 /* Does not return */
2095 continue; /* With next input character */
2097 /* End of header line reached */
2101 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2103 receive_linecount++;
2104 message_linecount++;
2106 /* Keep track of maximum line length */
2108 if (ptr - prevlines_length > max_received_linelength)
2109 max_received_linelength = ptr - prevlines_length;
2110 prevlines_length = ptr + 1;
2112 /* Now put in the terminating newline. There is always space for
2113 at least two more characters. */
2115 next->text[ptr++] = '\n';
2118 /* A blank line signals the end of the headers; release the unwanted
2119 space and set next to NULL to indicate this. */
2123 reset_point = store_reset(reset_point);
2128 /* There is data in the line; see if the next input character is a
2129 whitespace character. If it is, we have a continuation of this header line.
2130 There is always space for at least one character at this point. */
2134 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2135 if (nextch == ' ' || nextch == '\t')
2137 next->text[ptr++] = nextch;
2138 if (++message_size >= header_maxsize)
2140 continue; /* Iterate the loop */
2142 else if (nextch >= 0) /* not EOF, ERR etc */
2143 (receive_ungetc)(nextch); /* For next time */
2144 else ch = nextch; /* Cause main loop to exit at end */
2147 /* We have got to the real line end. Terminate the string and release store
2148 beyond it. If it turns out to be a real header, internal binary zeros will
2149 be squashed later. */
2151 next->text[ptr] = 0;
2153 store_release_above(next->text + ptr + 1);
2155 /* Check the running total size against the overall message size limit. We
2156 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2157 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2158 headers - the code to read the body will then also hit the buffer. */
2160 if (message_size > thismessage_size_limit) break;
2162 /* A line that is not syntactically correct for a header also marks
2163 the end of the headers. In this case, we leave next containing the
2164 first data line. This might actually be several lines because of the
2165 continuation logic applied above, but that doesn't matter.
2167 It turns out that smail, and presumably sendmail, accept leading lines
2170 From ph10 Fri Jan 5 12:35 GMT 1996
2172 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2173 find any documentation of this, but for compatibility it had better be
2174 accepted. Exim restricts it to the case of non-smtp messages, and
2175 treats it as an alternative to the -f command line option. Thus it is
2176 ignored except for trusted users or filter testing. Otherwise it is taken
2177 as the sender address, unless -f was used (sendmail compatibility).
2179 It further turns out that some UUCPs generate the From_line in a different
2182 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2184 The regex for matching these things is now capable of recognizing both
2185 formats (including 2- and 4-digit years in the latter). In fact, the regex
2186 is now configurable, as is the expansion string to fish out the sender.
2188 Even further on it has been discovered that some broken clients send
2189 these lines in SMTP messages. There is now an option to ignore them from
2190 specified hosts or networks. Sigh. */
2192 if ( header_last == header_list
2194 || ( sender_host_address
2195 && verify_check_host(&ignore_fromline_hosts) == OK
2197 || (!sender_host_address && ignore_fromline_local)
2199 && regex_match_and_setup(regex_From, next->text, 0, -1)
2202 if (!f.sender_address_forced)
2204 uschar *uucp_sender = expand_string(uucp_from_sender);
2206 log_write(0, LOG_MAIN|LOG_PANIC,
2207 "expansion of \"%s\" failed after matching "
2208 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2211 int start, end, domain;
2213 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2214 &start, &end, &domain, TRUE);
2217 if (domain == 0 && newsender[0] != 0)
2218 /* deconst ok as newsender was not const */
2219 newsender = US rewrite_address_qualify(newsender, FALSE);
2221 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2223 sender_address = newsender;
2225 if (f.trusted_caller || filter_test != FTEST_NONE)
2227 authenticated_sender = NULL;
2228 originator_name = US"";
2229 f.sender_local = FALSE;
2232 if (filter_test != FTEST_NONE)
2233 printf("Sender taken from \"From \" line\n");
2240 /* Not a leading "From " line. Check to see if it is a valid header line.
2241 Header names may contain any non-control characters except space and colon,
2246 uschar * p = next->text;
2248 /* If not a valid header line, break from the header reading loop, leaving
2249 next != NULL, indicating that it holds the first line of the body. */
2251 if (isspace(*p)) break;
2252 while (mac_isgraph(*p) && *p != ':') p++;
2253 while (isspace(*p)) p++;
2256 body_zerocount = had_zero;
2260 /* We have a valid header line. If there were any binary zeroes in
2261 the line, stomp on them here. */
2264 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2267 /* It is perfectly legal to have an empty continuation line
2268 at the end of a header, but it is confusing to humans
2269 looking at such messages, since it looks like a blank line.
2270 Reduce confusion by removing redundant white space at the
2271 end. We know that there is at least one printing character
2272 (the ':' tested for above) so there is no danger of running
2275 p = next->text + ptr - 2;
2278 while (*p == ' ' || *p == '\t') p--;
2279 if (*p != '\n') break;
2280 ptr = (p--) - next->text + 1;
2281 message_size -= next->slen - ptr;
2282 next->text[ptr] = 0;
2286 /* Add the header to the chain */
2288 next->type = htype_other;
2290 header_last->next = next;
2293 /* Check the limit for individual line lengths. This comes after adding to
2294 the chain so that the failing line is reflected if a bounce is generated
2295 (for a local message). */
2297 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2299 log_write(0, LOG_MAIN, "overlong message header line received from "
2300 "%s (more than %d characters): message abandoned",
2301 f.sender_host_unknown ? sender_ident : sender_fullhost,
2302 header_line_maxsize);
2306 smtp_reply = US"552 A message header line is too long";
2307 receive_swallow_smtp();
2308 goto TIDYUP; /* Skip to end of function */
2312 give_local_error(ERRMESS_VLONGHDRLINE,
2313 string_sprintf("message header line longer than %d characters "
2314 "received: message not accepted", header_line_maxsize), US"",
2315 error_rc, stdin, header_list->next);
2316 /* Does not return */
2319 /* Note if any resent- fields exist. */
2321 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2323 resents_exist = TRUE;
2324 resent_prefix = US"Resent-";
2328 /* Reject CHUNKING messages that do not CRLF their first header line */
2330 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2332 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2333 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2335 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2336 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2337 smtp_printf("552 Message header not CRLF terminated\r\n", SP_NO_MORE);
2340 goto TIDYUP; /* Skip to end of function */
2343 /* The line has been handled. If we have hit EOF, break out of the loop,
2344 indicating no pending data line and no more data for the message */
2349 if (ch == EOF) message_ended = END_DOT;
2350 else if (ch == ERR) message_ended = END_PROTOCOL;
2354 /* Set up for the next header */
2356 reset_point = store_mark();
2358 next = store_get(sizeof(header_line), GET_UNTAINTED);
2359 next->text = store_get(header_size, GET_TAINTED);
2362 prevlines_length = 0;
2363 } /* Continue, starting to read the next header */
2365 /* At this point, we have read all the headers into a data structure in main
2366 store. The first header is still the dummy placeholder for the Received: header
2367 we are going to generate a bit later on. If next != NULL, it contains the first
2368 data line - which terminated the headers before reaching a blank line (not the
2373 debug_printf(">>Headers received:\n");
2374 for (header_line * h = header_list->next; h; h = h->next)
2375 debug_printf("%s", h->text);
2379 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2380 is dropped immediately after valid headers, the next thing we will see is EOF.
2381 We must test for this specially, as further down the reading of the data is
2382 skipped if already at EOF.
2383 In CHUNKING mode, a protocol error makes us give up on the message. */
2386 if ((receive_feof)())
2388 smtp_reply = handle_lost_connection(US" (after header)");
2390 goto TIDYUP; /* Skip to end of function */
2392 else if (message_ended == END_PROTOCOL)
2394 smtp_reply = US""; /* no reply needed */
2398 /* If this is a filter test run and no headers were read, output a warning
2399 in case there is a mistake in the test message. */
2401 if (filter_test != FTEST_NONE && header_list->next == NULL)
2402 printf("Warning: no message headers read\n");
2405 /* Scan the headers to identify them. Some are merely marked for later
2406 processing; some are dealt with here. */
2408 for (header_line * h = header_list->next; h; h = h->next)
2410 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2411 if (is_resent) contains_resent_headers = TRUE;
2413 switch (header_checkname(h, is_resent))
2416 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2420 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2423 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2426 if (!resents_exist || is_resent) date_header_exists = TRUE;
2429 /* Same comments as about Return-Path: below. */
2431 case htype_delivery_date:
2432 if (delivery_date_remove) h->type = htype_old;
2435 /* Same comments as about Return-Path: below. */
2437 case htype_envelope_to:
2438 if (envelope_to_remove) h->type = htype_old;
2441 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2442 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2443 header consists of just the login id of the user who called Exim, rewrite
2444 it with the gecos field first. Apply this rule to Resent-From: if there
2445 are resent- fields. */
2448 h->type = htype_from;
2449 if (!resents_exist || is_resent)
2455 uschar *s = Ustrchr(h->text, ':') + 1;
2456 while (isspace(*s)) s++;
2457 len = h->slen - (s - h->text) - 1;
2458 if (Ustrlen(originator_login) == len &&
2459 strncmpic(s, originator_login, len) == 0)
2461 uschar *name = is_resent? US"Resent-From" : US"From";
2462 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2463 originator_login, qualify_domain_sender);
2464 from_header = header_last;
2465 h->type = htype_old;
2466 DEBUG(D_receive|D_rewrite)
2467 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2473 /* Identify the Message-id: header for generating "in-reply-to" in the
2474 autoreply transport. For incoming logging, save any resent- value. In both
2475 cases, take just the first of any multiples. */
2478 if (!msgid_header && (!resents_exist || is_resent))
2485 /* Flag all Received: headers */
2487 case htype_received:
2488 h->type = htype_received;
2492 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2494 case htype_reply_to:
2495 h->type = htype_reply_to;
2498 /* The Return-path: header is supposed to be added to messages when
2499 they leave the SMTP system. We shouldn't receive messages that already
2500 contain Return-path. However, since Exim generates Return-path: on
2501 local delivery, resent messages may well contain it. We therefore
2502 provide an option (which defaults on) to remove any Return-path: headers
2503 on input. Removal actually means flagging as "old", which prevents the
2504 header being transmitted with the message. */
2506 case htype_return_path:
2507 if (return_path_remove) h->type = htype_old;
2509 /* If we are testing a mail filter file, use the value of the
2510 Return-Path: header to set up the return_path variable, which is not
2511 otherwise set. However, remove any <> that surround the address
2512 because the variable doesn't have these. */
2514 if (filter_test != FTEST_NONE)
2516 uschar *start = h->text + 12;
2517 uschar *end = start + Ustrlen(start);
2518 while (isspace(*start)) start++;
2519 while (end > start && isspace(end[-1])) end--;
2520 if (*start == '<' && end[-1] == '>')
2525 return_path = string_copyn(start, end - start);
2526 printf("Return-path taken from \"Return-path:\" header line\n");
2530 /* If there is a "Sender:" header and the message is locally originated,
2531 and from an untrusted caller and suppress_local_fixups is not set, or if we
2532 are in submission mode for a remote message, mark it "old" so that it will
2533 not be transmitted with the message, unless active_local_sender_retain is
2534 set. (This can only be true if active_local_from_check is false.) If there
2535 are any resent- headers in the message, apply this rule to Resent-Sender:
2536 instead of Sender:. Messages with multiple resent- header sets cannot be
2537 tidily handled. (For this reason, at least one MUA - Pine - turns old
2538 resent- headers into X-resent- headers when resending, leaving just one
2542 h->type = !f.active_local_sender_retain
2543 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2544 || f.submission_mode
2546 && (!resents_exist || is_resent)
2547 ? htype_old : htype_sender;
2550 /* Remember the Subject: header for logging. There is no Resent-Subject */
2556 /* "To:" gets flagged, and the existence of a recipient header is noted,
2557 whether it's resent- or not. */
2562 to_or_cc_header_exists = TRUE;
2568 /* Extract recipients from the headers if that is required (the -t option).
2569 Note that this is documented as being done *before* any address rewriting takes
2570 place. There are two possibilities:
2572 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2573 recipients already listed are to be REMOVED from the message. Smail 3 works
2574 like this. We need to build a non-recipients tree for that list, because in
2575 subsequent processing this data is held in a tree and that's what the
2576 spool_write_header() function expects. Make sure that non-recipient addresses
2577 are fully qualified and rewritten if necessary.
2579 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2580 those in the command line arguments (and it is rumoured some other MTAs do
2581 this). Therefore, there is an option to make Exim behave this way.
2583 *** Notes on "Resent-" header lines ***
2585 The presence of resent-headers in the message makes -t horribly ambiguous.
2586 Experiments with sendmail showed that it uses recipients for all resent-
2587 headers, totally ignoring the concept of "sets of resent- headers" as described
2588 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2589 with all the addresses in one instance of each header.
2591 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2592 error for -t if there were resent- headers in the message. However, after a
2593 discussion on the mailing list, I've learned that there are MUAs that use
2594 resent- headers with -t, and also that the stuff about sets of resent- headers
2595 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2596 message with -t and resent- header lines makes sure that only *its* resent-
2597 headers are present; previous ones are often renamed as X-resent- for example.
2599 Consequently, Exim has been changed so that, if any resent- header lines are
2600 present, the recipients are taken from all of the appropriate resent- lines,
2601 and not from the ordinary To:, Cc:, etc. */
2606 error_block **bnext = &bad_addresses;
2608 if (extract_addresses_remove_arguments)
2610 while (recipients_count-- > 0)
2612 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2613 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2614 tree_add_nonrecipient(s);
2616 recipients_list = NULL;
2617 recipients_count = recipients_list_max = 0;
2620 /* Now scan the headers */
2622 for (header_line * h = header_list->next; h; h = h->next)
2624 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2625 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2627 uschar * s = Ustrchr(h->text, ':') + 1;
2628 while (isspace(*s)) s++;
2630 f.parse_allow_group = TRUE; /* Allow address group syntax */
2634 uschar *ss = parse_find_address_end(s, FALSE);
2635 uschar *recipient, *errmess, *pp;
2636 int start, end, domain;
2638 /* Check on maximum */
2640 if (recipients_max_expanded > 0 && ++rcount > recipients_max_expanded)
2641 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2642 US"message rejected: ", error_rc, stdin, NULL);
2643 /* Does not return */
2645 /* Make a copy of the address, and remove any internal newlines. These
2646 may be present as a result of continuations of the header line. The
2647 white space that follows the newline must not be removed - it is part
2650 pp = recipient = store_get(ss - s + 1, s);
2651 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2656 BOOL b = allow_utf8_domains;
2657 allow_utf8_domains = TRUE;
2659 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2664 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2665 else allow_utf8_domains = b;
2671 /* Keep a list of all the bad addresses so we can send a single
2672 error message at the end. However, an empty address is not an error;
2673 just ignore it. This can come from an empty group list like
2675 To: Recipients of list:;
2677 If there are no recipients at all, an error will occur later. */
2679 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2681 int len = Ustrlen(s);
2682 error_block * b = store_get(sizeof(error_block), GET_UNTAINTED);
2683 while (len > 0 && isspace(s[len-1])) len--;
2685 b->text1 = string_printing(string_copyn(s, len));
2691 /* If the recipient is already in the nonrecipients tree, it must
2692 have appeared on the command line with the option extract_addresses_
2693 remove_arguments set. Do not add it to the recipients, and keep a note
2694 that this has happened, in order to give a better error if there are
2695 no recipients left. */
2699 if (tree_search(tree_nonrecipients, recipient) == NULL)
2700 receive_add_recipient(recipient, -1);
2702 extracted_ignored = TRUE;
2705 /* Move on past this address */
2707 s = ss + (*ss ? 1 : 0);
2708 while (isspace(*s)) s++;
2709 } /* Next address */
2711 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2712 f.parse_found_group = FALSE;
2714 /* If this was the bcc: header, mark it "old", which means it
2715 will be kept on the spool, but not transmitted as part of the
2718 if (h->type == htype_bcc) h->type = htype_old;
2719 } /* For appropriate header line */
2720 } /* For each header line */
2724 /* Now build the unique message id. This has changed several times over the
2725 lifetime of Exim, and is changing for Exim 4.97.
2726 The previous change was in about 2003.
2728 Detail for the pre-4.97 version is here in [square-brackets].
2730 The message ID has 3 parts: tttttt-ppppppppppp-ssss (6, 11, 4 - total 23 with
2731 the dashes). Each part is a number in base 62.
2732 [ tttttt-pppppp-ss 6, 6, 2 => 16 ]
2734 The first part is the current time, in seconds. Six chars is enough until
2735 year 3700 with case-sensitive filesystes, but will run out in 2038 on
2736 case-insensitive ones (Cygwin, Darwin - where we have to use base-36.
2737 Both of those are in the "unsupported" bucket, so ignore for now).
2739 The second part is the current pid, and supports 64b [31b] PIDs.
2741 The third part holds sub-second time, plus (when localhost_number is set)
2742 the host number multiplied by a number large enough to keep it away from
2743 the time portion. Host numbers are restricted to the range 0-16.
2744 The time resolution is variously 1, 2 or 4 microseconds [0.5 or 1 ms]
2745 depending on the use of localhost_nubmer and of case-insensitive filesystems.
2747 After a message has been received, Exim ensures that the timer has ticked at the
2748 appropriate level before proceeding, to avoid duplication if the pid happened to
2749 be re-used within the same time period. It seems likely that most messages will
2750 take at least half a millisecond to be received, so no delay will normally be
2751 necessary. At least for some time...
2753 Note that string_base62_XX() returns its data in a static storage block, so it
2754 must be copied before calling string_base62_XXX) again. It always returns exactly
2755 11 (_64) or 6 (_32) characters.
2757 There doesn't seem to be anything in the RFC which requires a message id to
2758 start with a letter, but Smail was changed to ensure this. The external form of
2759 the message id (as supplied by string expansion) therefore starts with an
2760 additional leading 'E'. The spool file names do not include this leading
2761 letter and it is not used internally.
2763 NOTE: If ever the format of message ids is changed, the regular expression for
2764 checking that a string is in this format must be updated in a corresponding
2765 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2766 must also be changed to reflect the correct string length. The queue-sort code
2767 needs to know the layout. Then, of course, other programs that rely on the
2768 message id format will need updating too (inc. at least exim_msgdate). */
2770 Ustrncpy(message_id, string_base62_32((long int)(message_id_tv.tv_sec)), MESSAGE_ID_TIME_LEN);
2771 message_id[MESSAGE_ID_TIME_LEN] = '-';
2772 Ustrncpy(message_id + MESSAGE_ID_TIME_LEN + 1,
2773 string_base62_64((long int)getpid()),
2777 /* Deal with the case where the host number is set. The value of the number was
2778 checked when it was read, to ensure it isn't too big. */
2780 if (host_number_string)
2781 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2782 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2783 string_base62_32((long int)(
2784 host_number * (1000000/id_resolution)
2785 + message_id_tv.tv_usec/id_resolution))
2786 + (6 - MESSAGE_ID_SUBTIME_LEN)
2789 /* Host number not set: final field is just the fractional time at an
2790 appropriate resolution. */
2793 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2794 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2795 string_base62_32((long int)(message_id_tv.tv_usec/id_resolution))
2796 + (6 - MESSAGE_ID_SUBTIME_LEN));
2798 /* Add the current message id onto the current process info string if
2801 (void)string_format(process_info + process_info_len,
2802 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2804 /* If we are using multiple input directories, set up the one for this message
2805 to be the least significant base-62 digit of the time of arrival. Otherwise
2806 ensure that it is an empty string. */
2808 set_subdir_str(message_subdir, message_id, 0);
2810 /* Now that we have the message-id, if there is no message-id: header, generate
2811 one, but only for local (without suppress_local_fixups) or submission mode
2812 messages. This can be user-configured if required, but we had better flatten
2813 any illegal characters therein. */
2816 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2818 uschar *id_text = US"";
2819 uschar *id_domain = primary_hostname;
2822 /* Permit only letters, digits, dots, and hyphens in the domain */
2824 if (message_id_domain)
2826 uschar *new_id_domain = expand_string(message_id_domain);
2829 if (!f.expand_string_forcedfail)
2830 log_write(0, LOG_MAIN|LOG_PANIC,
2831 "expansion of \"%s\" (message_id_header_domain) "
2832 "failed: %s", message_id_domain, expand_string_message);
2834 else if (*new_id_domain)
2836 id_domain = new_id_domain;
2837 for (uschar * p = id_domain; *p; p++)
2838 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2842 /* Permit all characters except controls and RFC 2822 specials in the
2843 additional text part. */
2845 if (message_id_text)
2847 uschar *new_id_text = expand_string(message_id_text);
2850 if (!f.expand_string_forcedfail)
2851 log_write(0, LOG_MAIN|LOG_PANIC,
2852 "expansion of \"%s\" (message_id_header_text) "
2853 "failed: %s", message_id_text, expand_string_message);
2855 else if (*new_id_text)
2857 id_text = new_id_text;
2858 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2862 /* Add the header line.
2863 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2864 appended, to preserve classical expectations of header ordering. */
2866 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2867 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2868 *id_text == 0 ? "" : ".", id_text, id_domain);
2870 /* Arrange for newly-created Message-Id to be logged */
2874 msgid_header_newly_created = TRUE;
2879 /* If we are to log recipients, keep a copy of the raw ones before any possible
2880 rewriting. Must copy the count, because later ACLs and the local_scan()
2881 function may mess with the real recipients. */
2883 if (LOGGING(received_recipients))
2885 raw_recipients = store_get(recipients_count * sizeof(uschar *), GET_UNTAINTED);
2886 for (int i = 0; i < recipients_count; i++)
2887 raw_recipients[i] = string_copy(recipients_list[i].address);
2888 raw_recipients_count = recipients_count;
2891 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2892 recipients will get here only if the conditions were right (allow_unqualified_
2893 recipient is TRUE). */
2896 { debug_printf_indent("qualify & rewrite recipients list\n"); acl_level++; }
2897 for (int i = 0; i < recipients_count; i++)
2898 recipients_list[i].address = /* deconst ok as src was not cont */
2899 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2900 global_rewrite_rules, rewrite_existflags);
2901 DEBUG(D_rewrite) acl_level--;
2903 /* If there is no From: header, generate one for local (without
2904 suppress_local_fixups) or submission_mode messages. If there is no sender
2905 address, but the sender is local or this is a local delivery error, use the
2906 originator login. This shouldn't happen for genuine bounces, but might happen
2907 for autoreplies. The addition of From: must be done *before* checking for the
2908 possible addition of a Sender: header, because untrusted_set_sender allows an
2909 untrusted user to set anything in the envelope (which might then get info
2910 From:) but we still want to ensure a valid Sender: if it is required. */
2913 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2915 const uschar * oname = US"";
2917 /* Use the originator_name if this is a locally submitted message and the
2918 caller is not trusted. For trusted callers, use it only if -F was used to
2919 force its value or if we have a non-SMTP message for which -f was not used
2920 to set the sender. */
2922 if (!sender_host_address)
2924 if (!f.trusted_caller || f.sender_name_forced ||
2925 (!smtp_input && !f.sender_address_forced))
2926 oname = originator_name;
2929 /* For non-locally submitted messages, the only time we use the originator
2930 name is when it was forced by the /name= option on control=submission. */
2932 else if (submission_name) oname = submission_name;
2934 /* Envelope sender is empty */
2936 if (!*sender_address)
2938 uschar *fromstart, *fromend;
2940 fromstart = string_sprintf("%sFrom: %s%s",
2941 resent_prefix, oname, *oname ? " <" : "");
2942 fromend = *oname ? US">" : US"";
2944 if (f.sender_local || f.local_error_message)
2945 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2946 local_part_quote(originator_login), qualify_domain_sender,
2949 else if (f.submission_mode && authenticated_id)
2951 if (!submission_domain)
2952 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2953 local_part_quote(authenticated_id), qualify_domain_sender,
2956 else if (!*submission_domain) /* empty => whole address set */
2957 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2961 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2962 local_part_quote(authenticated_id), submission_domain, fromend);
2964 from_header = header_last; /* To get it checked for Sender: */
2968 /* There is a non-null envelope sender. Build the header using the original
2969 sender address, before any rewriting that might have been done while
2974 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2977 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2980 from_header = header_last; /* To get it checked for Sender: */
2985 /* If the sender is local (without suppress_local_fixups), or if we are in
2986 submission mode and there is an authenticated_id, check that an existing From:
2987 is correct, and if not, generate a Sender: header, unless disabled. Any
2988 previously-existing Sender: header was removed above. Note that sender_local,
2989 as well as being TRUE if the caller of exim is not trusted, is also true if a
2990 trusted caller did not supply a -f argument for non-smtp input. To allow
2991 trusted callers to forge From: without supplying -f, we have to test explicitly
2992 here. If the From: header contains more than one address, then the call to
2993 parse_extract_address fails, and a Sender: header is inserted, as required. */
2996 && ( f.active_local_from_check
2997 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2998 || f.submission_mode && authenticated_id
3001 BOOL make_sender = TRUE;
3002 int start, end, domain;
3004 uschar *from_address =
3005 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
3006 &start, &end, &domain, FALSE);
3007 uschar *generated_sender_address;
3009 generated_sender_address = f.submission_mode
3010 ? !submission_domain
3011 ? string_sprintf("%s@%s",
3012 local_part_quote(authenticated_id), qualify_domain_sender)
3013 : !*submission_domain /* empty => full address */
3014 ? string_sprintf("%s", authenticated_id)
3015 : string_sprintf("%s@%s",
3016 local_part_quote(authenticated_id), submission_domain)
3017 : string_sprintf("%s@%s",
3018 local_part_quote(originator_login), qualify_domain_sender);
3020 /* Remove permitted prefixes and suffixes from the local part of the From:
3021 address before doing the comparison with the generated sender. */
3026 uschar *at = domain ? from_address + domain - 1 : NULL;
3029 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
3030 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
3032 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
3033 from_address += slen;
3037 if ( strcmpic(generated_sender_address, from_address) == 0
3038 || (!domain && strcmpic(from_address, originator_login) == 0))
3039 make_sender = FALSE;
3042 /* We have to cause the Sender header to be rewritten if there are
3043 appropriate rewriting rules. */
3046 if (f.submission_mode && !submission_name)
3047 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
3048 generated_sender_address);
3050 header_add(htype_sender, "%sSender: %s <%s>\n",
3052 f.submission_mode ? submission_name : originator_name,
3053 generated_sender_address);
3055 /* Ensure that a non-null envelope sender address corresponds to the
3056 submission mode sender address. */
3058 if (f.submission_mode && *sender_address)
3060 if (!sender_address_unrewritten)
3061 sender_address_unrewritten = sender_address;
3062 sender_address = generated_sender_address;
3063 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
3064 log_write(L_address_rewrite, LOG_MAIN,
3065 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
3066 sender_address_unrewritten, generated_sender_address);
3070 /* If there are any rewriting rules, apply them to the sender address, unless
3071 it has already been rewritten as part of verification for SMTP input. */
3074 { debug_printf("rewrite rules on sender address\n"); acl_level++; }
3075 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
3077 /* deconst ok as src was not const */
3078 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
3079 global_rewrite_rules, rewrite_existflags);
3080 DEBUG(D_receive|D_rewrite)
3081 debug_printf("rewritten sender = %s\n", sender_address);
3083 DEBUG(D_rewrite) acl_level--;
3086 /* The headers must be run through rewrite_header(), because it ensures that
3087 addresses are fully qualified, as well as applying any rewriting rules that may
3090 Qualification of header addresses in a message from a remote host happens only
3091 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
3092 appropriate. For local messages, qualification always happens, unless -bnq is
3093 used to explicitly suppress it. No rewriting is done for an unqualified address
3094 that is left untouched.
3096 We start at the second header, skipping our own Received:. This rewriting is
3097 documented as happening *after* recipient addresses are taken from the headers
3098 by the -t command line option. An added Sender: gets rewritten here. */
3101 { debug_printf("qualify and rewrite headers\n"); acl_level++; }
3102 for (header_line * h = header_list->next, * newh; h; h = h->next)
3103 if ((newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3104 rewrite_existflags, TRUE)))
3106 DEBUG(D_rewrite) acl_level--;
3109 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3110 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3111 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3112 exists, this applies to the set of resent- headers rather than the normal set.
3114 The requirement for a recipient header has been removed in RFC 2822. At this
3115 point in the code, earlier versions of Exim added a To: header for locally
3116 submitted messages, and an empty Bcc: header for others. In the light of the
3117 changes in RFC 2822, this was dropped in November 2003. */
3120 /* If there is no date header, generate one if the message originates locally
3121 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3122 submission mode flag is set. Messages without Date: are not valid, but it seems
3123 to be more confusing if Exim adds one to all remotely-originated messages.
3124 As per Message-Id, we prepend if resending, else append.
3127 if ( !date_header_exists
3128 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3129 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3130 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3132 search_tidyup(); /* Free any cached resources */
3134 /* Show the complete set of headers if debugging. Note that the first one (the
3135 new Received:) has not yet been set. */
3139 debug_printf(">>Headers after rewriting and local additions:\n");
3141 for (header_line * h = header_list->next; h; h = h->next)
3142 debug_printf_indent("%c %s", h->type, h->text);
3147 /* The headers are now complete in store. If we are running in filter
3148 testing mode, that is all this function does. Return TRUE if the message
3149 ended with a dot. */
3151 if (filter_test != FTEST_NONE)
3153 process_info[process_info_len] = 0;
3154 return message_ended == END_DOT;
3157 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3158 think more if it could be handled. Cannot do onward CHUNKING unless
3159 inbound is, but inbound chunking ought to be ok with outbound plain.
3160 Could we do onward CHUNKING given inbound CHUNKING?
3162 if (chunking_state > CHUNKING_OFFERED)
3163 cancel_cutthrough_connection(FALSE, US"chunking active");
3165 /* Cutthrough delivery:
3166 We have to create the Received header now rather than at the end of reception,
3167 so the timestamp behaviour is a change to the normal case.
3168 Having created it, send the headers to the destination. */
3170 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3172 if (received_count > received_headers_max)
3174 cancel_cutthrough_connection(TRUE, US"too many headers");
3175 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3176 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3177 "Too many \"Received\" headers",
3179 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3180 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3181 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3182 goto NOT_ACCEPTED; /* Skip to end of function */
3184 received_header_gen();
3185 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3186 (void) cutthrough_headers_send();
3190 /* Open a new spool file for the data portion of the message. We need
3191 to access it both via a file descriptor and a stdio stream. Try to make the
3192 directory if it isn't there. */
3194 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3195 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3197 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3199 if (errno == ENOENT)
3201 (void) directory_make(spool_directory,
3202 spool_sname(US"input", message_subdir),
3203 INPUT_DIRECTORY_MODE, TRUE);
3204 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3207 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3208 spool_name, strerror(errno));
3211 /* Make sure the file's group is the Exim gid, and double-check the mode
3212 because the group setting doesn't always get set automatically. */
3214 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3215 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3216 "Failed setting ownership on spool file %s: %s",
3217 spool_name, strerror(errno));
3218 (void)fchmod(data_fd, SPOOL_MODE);
3220 /* We now have data file open. Build a stream for it and lock it. We lock only
3221 the first line of the file (containing the message ID) because otherwise there
3222 are problems when Exim is run under Cygwin (I'm told). See comments in
3223 spool_in.c, where the same locking is done. */
3225 spool_data_file = fdopen(data_fd, "w+");
3226 lock_data.l_type = F_WRLCK;
3227 lock_data.l_whence = SEEK_SET;
3228 lock_data.l_start = 0;
3229 lock_data.l_len = spool_data_start_offset(message_id);
3231 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3232 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3233 errno, strerror(errno));
3235 /* We have an open, locked data file. Write the message id to it to make it
3236 self-identifying. Then read the remainder of the input of this message and
3237 write it to the data file. If the variable next != NULL, it contains the first
3238 data line (which was read as a header but then turned out not to have the right
3239 format); write it (remembering that it might contain binary zeros). The result
3240 of fwrite() isn't inspected; instead we call ferror() below. */
3242 fprintf(spool_data_file, "%s-D\n", message_id);
3245 uschar *s = next->text;
3246 int len = next->slen;
3247 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3248 body_linecount++; /* Assumes only 1 line */
3251 /* Note that we might already be at end of file, or the logical end of file
3252 (indicated by '.'), or might have encountered an error while writing the
3253 message id or "next" line. */
3255 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3259 message_ended = chunking_state <= CHUNKING_OFFERED
3260 ? read_message_data_smtp(spool_data_file, first_line_ended_crlf)
3262 ? read_message_bdat_smtp_wire(spool_data_file)
3263 : read_message_bdat_smtp(spool_data_file);
3264 receive_linecount++; /* The terminating "." line */
3267 message_ended = read_message_data(spool_data_file);
3269 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3270 message_linecount += body_linecount;
3272 switch (message_ended)
3274 /* Handle premature termination of SMTP */
3279 Uunlink(spool_name); /* Lose data file when closed */
3280 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3281 smtp_reply = handle_lost_connection(US"");
3283 goto NOT_ACCEPTED; /* Skip to end of function */
3287 /* Handle message that is too big. Don't use host_or_ident() in the log
3288 message; we want to see the ident value even for non-remote messages. */
3291 Uunlink(spool_name); /* Lose the data file when closed */
3292 cancel_cutthrough_connection(TRUE, US"mail too big");
3293 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3295 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3296 "message too big: read=%d max=%d",
3298 sender_fullhost ? " H=" : "",
3299 sender_fullhost ? sender_fullhost : US"",
3300 sender_ident ? " U=" : "",
3301 sender_ident ? sender_ident : US"",
3303 thismessage_size_limit);
3307 smtp_reply = US"552 Message size exceeds maximum permitted";
3308 goto NOT_ACCEPTED; /* Skip to end of function */
3312 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3313 give_local_error(ERRMESS_TOOBIG,
3314 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3315 US"message rejected: ", error_rc, spool_data_file, header_list);
3316 /* Does not return */
3320 /* Handle bad BDAT protocol sequence */
3323 Uunlink(spool_name); /* Lose the data file when closed */
3324 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3325 smtp_reply = US""; /* Response already sent */
3326 goto NOT_ACCEPTED; /* Skip to end of function */
3330 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3331 example, there may be some expansion in an ACL that uses a timer.) */
3333 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3335 /* The message body has now been read into the data file. Call fflush() to
3336 empty the buffers in C, and then call fsync() to get the data written out onto
3337 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3338 having to do this). If there was an I/O error on either input or output,
3339 attempt to send an error message, and unlink the spool file. For non-SMTP input
3340 we can then give up. Note that for SMTP input we must swallow the remainder of
3341 the input in cases of output errors, since the far end doesn't expect to see
3342 anything until the terminating dot line is sent. */
3344 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3345 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3347 uschar *msg_errno = US strerror(errno);
3348 BOOL input_error = (receive_ferror)() != 0;
3349 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3350 input_error? "Input read" : "Spool write",
3352 sender_fullhost ? sender_fullhost : sender_ident);
3354 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3355 Uunlink(spool_name); /* Lose the data file */
3356 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3361 smtp_reply = US"451 Error while reading input data";
3364 smtp_reply = US"451 Error while writing spool file";
3365 receive_swallow_smtp();
3367 goto NOT_ACCEPTED; /* Skip to end of function */
3372 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3373 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3375 /* Does not return */
3380 /* No I/O errors were encountered while writing the data file. */
3382 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3383 gettimeofday(&received_time_complete, NULL);
3386 /* If there were any bad addresses extracted by -t, or there were no recipients
3387 left after -t, send a message to the sender of this message, or write it to
3388 stderr if the error handling option is set that way. Note that there may
3389 legitimately be no recipients for an SMTP message if they have all been removed
3392 We need to rewind the data file in order to read it. In the case of no
3393 recipients or stderr error writing, throw the data file away afterwards, and
3394 exit. (This can't be SMTP, which always ensures there's at least one
3395 syntactically good recipient address.) */
3397 if (extract_recip && (bad_addresses || recipients_count == 0))
3401 if (recipients_count == 0) debug_printf("*** No recipients\n");
3404 debug_printf("*** Bad address(es)\n");
3405 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3406 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3410 log_write(0, LOG_MAIN|LOG_PANIC, "%s found in headers",
3411 bad_addresses ? "bad addresses" : "no recipients");
3413 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3415 /* If configured to send errors to the sender, but this fails, force
3416 a failure error code. We use a special one for no recipients so that it
3417 can be detected by the autoreply transport. Otherwise error_rc is set to
3418 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3419 it is EXIT_SUCCESS. */
3421 if (error_handling == ERRORS_SENDER)
3423 if (!moan_to_sender(
3425 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3426 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3427 bad_addresses, header_list, spool_data_file, FALSE
3429 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3434 if (extracted_ignored)
3435 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3437 fprintf(stderr, "exim: no recipients in message\n");
3440 fprintf(stderr, "exim: invalid address%s",
3441 bad_addresses->next ? "es:\n" : ":");
3442 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3443 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3444 bad_addresses->text2);
3448 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3450 Uunlink(spool_name);
3451 (void)fclose(spool_data_file);
3452 exim_exit(error_rc);
3456 /* Data file successfully written. Generate text for the Received: header by
3457 expanding the configured string, and adding a timestamp. By leaving this
3458 operation till now, we ensure that the timestamp is the time that message
3459 reception was completed. However, this is deliberately done before calling the
3460 data ACL and local_scan().
3462 This Received: header may therefore be inspected by the data ACL and by code in
3463 the local_scan() function. When they have run, we update the timestamp to be
3464 the final time of reception.
3466 If there is just one recipient, set up its value in the $received_for variable
3467 for use when we generate the Received: header.
3469 Note: the checking for too many Received: headers is handled by the delivery
3471 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3473 if (!received_header->text) /* Non-cutthrough case */
3475 received_header_gen();
3477 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3479 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3480 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3482 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3483 now, before running the DATA ACL. */
3485 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3488 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3489 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3491 /* If an ACL is specified for checking things at this stage of reception of a
3492 message, run it, unless all the recipients were removed by "discard" in earlier
3493 ACLs. That is the only case in which recipients_count can be zero at this
3494 stage. Set deliver_datafile to point to the data file so that $message_body and
3495 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3498 deliver_datafile = data_fd;
3501 f.enable_dollar_recipients = TRUE;
3503 if (recipients_count == 0)
3504 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3508 /* Handle interactive SMTP messages */
3510 if (smtp_input && !smtp_batched_input)
3513 #ifndef DISABLE_DKIM
3514 if (!f.dkim_disable_verify)
3516 /* Finish verification */
3517 dkim_exim_verify_finish();
3519 /* Check if we must run the DKIM ACL */
3520 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3522 uschar * dkim_verify_signers_expanded =
3523 expand_string(dkim_verify_signers);
3524 gstring * results = NULL;
3528 gstring * seen_items = NULL;
3529 int old_pool = store_pool;
3531 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3533 if (!(ptr = dkim_verify_signers_expanded))
3534 log_write(0, LOG_MAIN|LOG_PANIC,
3535 "expansion of dkim_verify_signers option failed: %s",
3536 expand_string_message);
3538 /* Default to OK when no items are present */
3540 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3542 /* Prevent running ACL for an empty item */
3543 if (!item || !*item) continue;
3545 /* Only run ACL once for each domain or identity,
3546 no matter how often it appears in the expanded list. */
3550 const uschar * seen_items_list = string_from_gstring(seen_items);
3552 BOOL seen_this_item = FALSE;
3554 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3556 if (Ustrcmp(seen_item,item) == 0)
3558 seen_this_item = TRUE;
3565 debug_printf("acl_smtp_dkim: skipping signer %s, "
3566 "already seen\n", item);
3570 seen_items = string_catn(seen_items, US":", 1);
3572 seen_items = string_cat(seen_items, item);
3574 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3578 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3579 "skipping remaining items\n", rc, item);
3580 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3584 dkim_verify_status = string_from_gstring(results);
3585 store_pool = old_pool;
3586 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3589 recipients_count = 0;
3590 blackholed_by = US"DKIM ACL";
3592 blackhole_log_msg = string_sprintf(": %s", log_msg);
3596 Uunlink(spool_name);
3597 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3598 smtp_yield = FALSE; /* No more messages after dropped connection */
3599 smtp_reply = US""; /* Indicate reply already sent */
3600 goto NOT_ACCEPTED; /* Skip to end of function */
3604 dkim_exim_verify_log_all();
3606 #endif /* DISABLE_DKIM */
3608 #ifdef WITH_CONTENT_SCAN
3609 if ( recipients_count > 0
3611 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3614 #endif /* WITH_CONTENT_SCAN */
3616 #ifdef SUPPORT_DMARC
3617 dmarc_store_data(from_header);
3620 #ifndef DISABLE_PRDR
3621 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3624 int all_fail = FAIL;
3626 smtp_printf("353 PRDR content analysis beginning\r\n", SP_MORE);
3627 /* Loop through recipients, responses must be in same order received */
3628 for (unsigned int c = 0; recipients_count > c; c++)
3630 const uschar * addr = recipients_list[c].address;
3631 uschar * msg= US"PRDR R=<%s> %s";
3634 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3635 addr, c+1, recipients_count);
3636 rc = acl_check(ACL_WHERE_PRDR, addr,
3637 acl_smtp_data_prdr, &user_msg, &log_msg);
3639 /* If any recipient rejected content, indicate it in final message */
3641 /* If all recipients rejected, indicate in final message */
3646 case OK: case DISCARD: code = US"250"; break;
3647 case DEFER: code = US"450"; break;
3648 default: code = US"550"; break;
3650 if (user_msg != NULL)
3651 smtp_user_msg(code, user_msg);
3656 case OK: case DISCARD:
3657 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3659 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3661 msg = string_sprintf(CS msg, addr, "refusal"); break;
3663 smtp_user_msg(code, msg);
3665 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3666 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3667 else log_write(0, LOG_MAIN, "%s", CS msg);
3669 if (rc != OK) { receive_remove_recipient(addr); c--; }
3671 /* Set up final message, used if data acl gives OK */
3672 smtp_reply = string_sprintf("%s id=%s message %s",
3673 all_fail == FAIL ? US"550" : US"250",
3676 ? US"rejected for all recipients"
3679 : US"accepted for some recipients");
3680 if (recipients_count == 0)
3684 prdr_requested = FALSE;
3685 #endif /* !DISABLE_PRDR */
3687 /* Check the recipients count again, as the MIME ACL might have changed
3690 if (acl_smtp_data && recipients_count > 0)
3692 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3693 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3696 recipients_count = 0;
3697 blackholed_by = US"DATA ACL";
3699 blackhole_log_msg = string_sprintf(": %s", log_msg);
3700 cancel_cutthrough_connection(TRUE, US"data acl discard");
3704 Uunlink(spool_name);
3705 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3706 #ifdef WITH_CONTENT_SCAN
3709 #ifdef EXPERIMENTAL_DCC
3712 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3713 smtp_yield = FALSE; /* No more messages after dropped connection */
3714 smtp_reply = US""; /* Indicate reply already sent */
3715 goto NOT_ACCEPTED; /* Skip to end of function */
3720 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3721 we cannot take different actions for permanent and temporary rejections. */
3726 #ifdef WITH_CONTENT_SCAN
3727 if ( acl_not_smtp_mime
3728 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3732 #endif /* WITH_CONTENT_SCAN */
3736 uschar *user_msg, *log_msg;
3737 f.authentication_local = TRUE;
3738 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3741 recipients_count = 0;
3742 blackholed_by = US"non-SMTP ACL";
3744 blackhole_log_msg = string_sprintf(": %s", log_msg);
3748 Uunlink(spool_name);
3749 #ifdef WITH_CONTENT_SCAN
3752 #ifdef EXPERIMENTAL_DCC
3755 /* The ACL can specify where rejections are to be logged, possibly
3756 nowhere. The default is main and reject logs. */
3758 if (log_reject_target)
3759 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3760 sender_address, log_msg);
3762 if (!user_msg) user_msg = US"local configuration problem";
3763 if (smtp_batched_input)
3764 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3765 /* Does not return */
3768 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3769 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3770 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3772 /* Does not return */
3775 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3779 /* The applicable ACLs have been run */
3781 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3782 if (f.queue_only_policy) queued_by = US"ACL";
3785 #ifdef WITH_CONTENT_SCAN
3789 #ifdef EXPERIMENTAL_DCC
3794 #ifdef HAVE_LOCAL_SCAN
3795 /* The final check on the message is to run the scan_local() function. The
3796 version supplied with Exim always accepts, but this is a hook for sysadmins to
3797 supply their own checking code. The local_scan() function is run even when all
3798 the recipients have been discarded. */
3800 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
3802 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3803 deleted, and the incident gets logged. */
3805 if (sigsetjmp(local_scan_env, 1) == 0)
3807 had_local_scan_crash = 0;
3808 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3809 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3810 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3811 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3813 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3814 local_scan_timeout);
3815 local_scan_data = NULL;
3817 had_local_scan_timeout = 0;
3818 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3819 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3820 rc = local_scan(data_fd, &local_scan_data);
3822 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3824 f.enable_dollar_recipients = FALSE;
3826 store_pool = POOL_MAIN; /* In case changed */
3827 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3830 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3831 os_non_restarting_signal(SIGFPE, SIG_DFL);
3832 os_non_restarting_signal(SIGILL, SIG_DFL);
3833 os_non_restarting_signal(SIGBUS, SIG_DFL);
3837 if (had_local_scan_crash)
3839 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3840 "signal %d - message temporarily rejected (size %d)",
3841 had_local_scan_crash, message_size);
3842 receive_bomb_out(US"local-scan-error", US"local verification problem");
3843 /* Does not return */
3845 if (had_local_scan_timeout)
3847 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3848 "message temporarily rejected (size %d)", message_size);
3849 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3850 /* Does not return */
3854 /* The length check is paranoia against some runaway code, and also because
3855 (for a success return) lines in the spool file are read into big_buffer. */
3857 if (local_scan_data)
3859 int len = Ustrlen(local_scan_data);
3860 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3861 local_scan_data = string_copyn(local_scan_data, len);
3864 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3866 if (!f.deliver_freeze) /* ACL might have already frozen */
3868 f.deliver_freeze = TRUE;
3869 deliver_frozen_at = time(NULL);
3870 frozen_by = US"local_scan()";
3872 rc = LOCAL_SCAN_ACCEPT;
3874 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3876 if (!f.queue_only_policy) /* ACL might have already queued */
3878 f.queue_only_policy = TRUE;
3879 queued_by = US"local_scan()";
3881 rc = LOCAL_SCAN_ACCEPT;
3884 /* Message accepted: remove newlines in local_scan_data because otherwise
3885 the spool file gets corrupted. Ensure that all recipients are qualified. */
3887 if (rc == LOCAL_SCAN_ACCEPT)
3889 if (local_scan_data)
3890 for (uschar * s = local_scan_data; *s; s++) if (*s == '\n') *s = ' ';
3891 for (recipient_item * r = recipients_list;
3892 r < recipients_list + recipients_count; r++)
3894 r->address = rewrite_address_qualify(r->address, TRUE);
3896 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3898 if (recipients_count == 0 && !blackholed_by)
3899 blackholed_by = US"local_scan";
3902 /* Message rejected: newlines permitted in local_scan_data to generate
3903 multiline SMTP responses. */
3907 uschar *istemp = US"";
3911 errmsg = local_scan_data;
3913 Uunlink(spool_name); /* Cancel this message */
3917 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3918 "rejection given", rc);
3921 case LOCAL_SCAN_REJECT_NOLOGHDR:
3922 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3925 case LOCAL_SCAN_REJECT:
3926 smtp_code = US"550";
3927 if (!errmsg) errmsg = US"Administrative prohibition";
3930 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3931 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3934 case LOCAL_SCAN_TEMPREJECT:
3936 smtp_code = US"451";
3937 if (!errmsg) errmsg = US"Temporary local problem";
3938 istemp = US"temporarily ";
3942 g = string_append(NULL, 2, US"F=", *sender_address ? sender_address : US"<>");
3943 g = add_host_info_for_log(g);
3945 log_write(0, LOG_MAIN|LOG_REJECT, "%Y %srejected by local_scan(): %.256s",
3946 g, istemp, string_printing(errmsg));
3949 if (!smtp_batched_input)
3951 smtp_respond(smtp_code, 3, SR_FINAL, errmsg);
3952 smtp_reply = US""; /* Indicate reply already sent */
3953 goto NOT_ACCEPTED; /* Skip to end of function */
3956 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3957 /* Does not return */
3960 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3961 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3962 US"message rejected by local scan code: ", error_rc, spool_data_file,
3964 /* Does not return */
3968 /* Reset signal handlers to ignore signals that previously would have caused
3969 the message to be abandoned. */
3971 signal(SIGTERM, SIG_IGN);
3972 signal(SIGINT, SIG_IGN);
3973 #endif /* HAVE_LOCAL_SCAN */
3975 /* If we are faking a reject or defer, avoid sennding a DSN for the
3976 actually-accepted message */
3978 if (fake_response != OK)
3979 for (recipient_item * r = recipients_list;
3980 r < recipients_list + recipients_count; r++)
3982 DEBUG(D_receive) if (r->dsn_flags & (rf_notify_success | rf_notify_delay))
3983 debug_printf("DSN: clearing flags due to fake-response for message\n");
3984 r->dsn_flags = r->dsn_flags & ~(rf_notify_success | rf_notify_delay)
3989 /* Ensure the first time flag is set in the newly-received message. */
3991 f.deliver_firsttime = TRUE;
3993 #ifdef EXPERIMENTAL_BRIGHTMAIL
3995 { /* rewind data file */
3996 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
3997 bmi_verdicts = bmi_process_message(header_list, data_fd);
4001 /* Update the timestamp in our Received: header to account for any time taken by
4002 an ACL or by local_scan(). The new time is the time that all reception
4003 processing is complete. */
4005 timestamp = expand_string(US"${tod_full}");
4006 tslen = Ustrlen(timestamp);
4008 memcpy(received_header->text + received_header->slen - tslen - 1,
4011 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
4015 f.deliver_freeze = FALSE;
4016 f.queue_only_policy = FALSE;
4019 /* Keep the data file open until we have written the header file, in order to
4020 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
4021 don't write the header file, and we unlink the data file. If writing the header
4022 file fails, we have failed to accept this message. */
4024 if (host_checking || blackholed_by)
4026 Uunlink(spool_name);
4027 msg_size = 0; /* Compute size for log line */
4028 for (header_line * h = header_list; h; h = h->next)
4029 if (h->type != '*') msg_size += h->slen;
4032 /* Write the -H file */
4035 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
4037 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
4038 Uunlink(spool_name); /* Lose the data file */
4042 smtp_reply = US"451 Error in writing spool file";
4047 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4048 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4050 /* Does not return */
4055 /* The message has now been successfully received. */
4057 receive_messagecount++;
4059 if ( fflush(spool_data_file)
4060 #if _POSIX_C_SOURCE >= 199309L || _XOPEN_SOURCE >= 500
4061 # ifdef ENABLE_DISABLE_FSYNC
4062 || !disable_fsync && fdatasync(data_fd)
4064 || fdatasync(data_fd)
4069 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
4070 log_write(0, LOG_MAIN, "%s\n", errmsg);
4071 Uunlink(spool_name); /* Lose the data file */
4075 smtp_reply = US"451 Error in writing spool file";
4080 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4081 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4083 /* Does not return */
4087 /* Add data size to written header size. We do not count the initial file name
4088 that is in the file, but we do add one extra for the notional blank line that
4089 precedes the data. This total differs from message_size in that it include the
4090 added Received: header and any other headers that got created locally. */
4092 fstat(data_fd, &statbuf);
4093 msg_size += statbuf.st_size - spool_data_start_offset(message_id) + 1;
4095 /* Generate a "message received" log entry. We do this by building up a dynamic
4096 string as required. We log the arrival of a new message while the
4097 file is still locked, just in case the machine is *really* fast, and delivers
4098 it first! Include any message id that is in the message - since the syntax of a
4099 message id is actually an addr-spec, we can use the parse routine to canonicalize
4102 rcvd_log_reset_point = store_mark();
4103 g = string_get(256);
4105 g = string_append(g, 2,
4106 fake_response == FAIL ? US"(= " : US"<= ",
4107 *sender_address ? sender_address : US"<>");
4108 if (message_reference)
4109 g = string_append(g, 2, US" R=", message_reference);
4111 g = add_host_info_for_log(g);
4114 if (LOGGING(tls_cipher) && tls_in.cipher)
4116 g = string_append(g, 2, US" X=", tls_in.cipher);
4117 # ifndef DISABLE_TLS_RESUME
4118 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4119 g = string_catn(g, US"*", 1);
4122 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4123 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4124 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4125 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4126 if (LOGGING(tls_sni) && tls_in.sni)
4127 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4130 if (sender_host_authenticated)
4132 g = string_append(g, 2, US" A=", sender_host_authenticated);
4133 if (authenticated_id)
4135 g = string_append(g, 2, US":", authenticated_id);
4136 if (LOGGING(smtp_mailauth) && authenticated_sender)
4137 g = string_append(g, 2, US":", authenticated_sender);
4141 #ifndef DISABLE_PRDR
4143 g = string_catn(g, US" PRDR", 5);
4146 #ifdef SUPPORT_PROXY
4147 if (proxy_session && LOGGING(proxy))
4148 g = string_append(g, 2, US" PRX=", proxy_local_address);
4151 if (chunking_state > CHUNKING_OFFERED)
4152 g = string_catn(g, US" K", 2);
4154 g = string_fmt_append(g, " S=%d", msg_size);
4156 /* log 8BITMIME mode announced in MAIL_FROM
4160 if (LOGGING(8bitmime))
4161 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4163 #ifndef DISABLE_DKIM
4164 if (LOGGING(dkim) && dkim_verify_overall)
4165 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4166 # ifdef EXPERIMENTAL_ARC
4167 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4168 g = string_catn(g, US" ARC", 4);
4172 if (LOGGING(receive_time))
4174 struct timeval diff = received_time_complete;
4175 timediff(&diff, &received_time);
4176 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4180 g = string_append(g, 2, US" Q=", queue_name);
4182 /* If an addr-spec in a message-id contains a quoted string, it can contain
4183 any characters except " \ and CR and so in particular it can contain NL!
4184 Therefore, make sure we use a printing-characters only version for the log.
4185 Also, allow for domain literals in the message id. */
4187 if ( LOGGING(msg_id) && msgid_header
4188 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4192 BOOL save_allow_domain_literals = allow_domain_literals;
4193 allow_domain_literals = TRUE;
4194 int start, end, domain;
4196 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4197 &errmsg, &start, &end, &domain, FALSE);
4198 allow_domain_literals = save_allow_domain_literals;
4200 g = string_append(g, 2,
4201 msgid_header_newly_created ? US" id*=" : US" id=",
4202 string_printing(old_id));
4205 /* If subject logging is turned on, create suitable printing-character
4206 text. By expanding $h_subject: we make use of the MIME decoding. */
4208 if (LOGGING(subject) && subject_header)
4210 uschar *p = big_buffer;
4211 uschar *ss = expand_string(US"$h_subject:");
4213 /* Backslash-quote any double quotes or backslashes so as to make a
4214 a C-like string, and turn any non-printers into escape sequences. */
4217 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4219 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4224 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4227 /* Terminate the string: string_cat() and string_append() leave room, but do
4228 not put the zero in. */
4230 (void) string_from_gstring(g);
4232 /* Create a message log file if message logs are being used and this message is
4233 not blackholed. Write the reception stuff to it. We used to leave message log
4234 creation until the first delivery, but this has proved confusing for some
4237 if (message_logs && !blackholed_by)
4240 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4242 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4246 (void)directory_make(spool_directory,
4247 spool_sname(US"msglog", message_subdir),
4248 MSGLOG_DIRECTORY_MODE, TRUE);
4249 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4253 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4254 m_name, strerror(errno));
4257 FILE *message_log = fdopen(fd, "a");
4260 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4261 m_name, strerror(errno));
4266 uschar * now = tod_stamp(tod_log);
4267 /* Drop the initial "<= " */
4268 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4269 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4271 if (f.queue_only_policy) fprintf(message_log,
4272 "%s no immediate delivery: queued%s%s by %s\n", now,
4273 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4275 (void)fclose(message_log);
4280 /* Everything has now been done for a successful message except logging its
4281 arrival, and outputting an SMTP response. While writing to the log, set a flag
4282 to cause a call to receive_bomb_out() if the log cannot be opened. */
4284 f.receive_call_bombout = TRUE;
4286 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4287 connection has gone away. This can only be done if there is no unconsumed input
4288 waiting in the local input buffer. We can test for this by calling
4289 receive_hasc(). RFC 2920 (pipelining) explicitly allows for additional
4290 input to be sent following the final dot, so the presence of following input is
4293 If the connection is still present, but there is no unread input for the
4294 socket, the result of a select() call will be zero. If, however, the connection
4295 has gone away, or if there is pending input, the result of select() will be
4296 non-zero. The two cases can be distinguished by trying to read the next input
4297 character. If we succeed, we can unread it so that it remains in the local
4298 buffer for handling later. If not, the connection has been lost.
4300 Of course, since TCP/IP is asynchronous, there is always a chance that the
4301 connection will vanish between the time of this test and the sending of the
4302 response, but the chance of this happening should be small. */
4304 if ( smtp_input && sender_host_address && !f.sender_host_notsocket
4307 if (poll_one_fd(fileno(smtp_in), POLLIN, 0) != 0)
4309 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4310 if (c != EOF) (receive_ungetc)(c);
4313 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4314 smtp_reply = US""; /* No attempt to send a response */
4315 smtp_yield = FALSE; /* Nothing more on this connection */
4317 /* Re-use the log line workspace */
4320 g = string_cat(g, US"SMTP connection lost after final dot");
4321 g = add_host_info_for_log(g);
4322 log_write(0, LOG_MAIN, "%Y", g);
4324 /* Delete the files for this aborted message. */
4326 Uunlink(spool_name);
4327 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4328 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4335 /* The connection has not gone away; we really are going to take responsibility
4336 for this message. */
4338 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4341 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4342 the sender's dot (below).
4343 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4344 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4345 in which case pass temp-reject back to initiator and dump the files.
4347 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4349 XXX We do not handle queue-only, freezing, or blackholes.
4351 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4353 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4354 /* Logging was done in finaldot() */
4357 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4358 cutthrough_done = ACCEPTED;
4359 break; /* message_id needed for SMTP accept below */
4361 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4362 ... for which, pass back the exact error */
4363 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4364 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4365 break; /* message_id needed for SMTP accept below */
4367 default: /* Unknown response, or error. Treat as temp-reject. */
4368 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4369 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4370 break; /* message_id needed for SMTP accept below */
4372 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4373 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4374 cutthrough_done = PERM_REJ;
4379 #ifndef DISABLE_PRDR
4380 if(!smtp_reply || prdr_requested)
4385 log_write(0, LOG_MAIN |
4386 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4387 (LOGGING(received_sender) ? LOG_SENDER : 0),
4390 /* Log any control actions taken by an ACL or local_scan(). */
4392 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4393 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4394 "no immediate delivery: queued%s%s by %s",
4395 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4398 f.receive_call_bombout = FALSE;
4400 /* The store for the main log message can be reused */
4401 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4403 /* If the message is frozen, and freeze_tell is set, do the telling. */
4405 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4406 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4407 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4408 message_id, frozen_by, sender_address);
4411 /* Either a message has been successfully received and written to the two spool
4412 files, or an error in writing the spool has occurred for an SMTP message, or
4413 an SMTP message has been rejected for policy reasons, or a message was passed on
4414 by cutthrough delivery. (For a non-SMTP message we will have already given up
4415 because there's no point in carrying on!) For non-cutthrough we must now close
4416 (and thereby unlock) the data file. In the successful case, this leaves the
4417 message on the spool, ready for delivery. In the error case, the spool file will
4418 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4421 For cutthrough we hold the data file locked until we have deleted it, otherwise
4422 a queue-runner could grab it in the window.
4424 A fflush() was done earlier in the expectation that any write errors on the
4425 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4426 possible for fclose() to fail - and this has been seen on obscure filesystems
4427 (probably one that delayed the actual media write as long as possible)
4428 but what to do? What has happened to the lock if this happens?
4429 It's a mess because we already logged the acceptance.
4430 We can at least log the issue, try to remove spoolfiles and respond with
4431 a temp-reject. We do not want to close before logging acceptance because
4432 we want to hold the lock until we know that logging worked.
4433 Could we make this less likely by doing an fdatasync() just after the fflush()?
4434 That seems like a good thing on data-security grounds, but how much will it hit
4441 message_id[0] = 0; /* Indicate no message accepted */
4444 process_info[process_info_len] = 0; /* Remove message id */
4445 if (spool_data_file && cutthrough_done == NOT_TRIED)
4447 if (fclose(spool_data_file)) /* Frees the lock */
4449 log_msg = string_sprintf("spoolfile error on close: %s", strerror(errno));
4450 log_write(0, LOG_MAIN|LOG_PANIC |
4451 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4452 (LOGGING(received_sender) ? LOG_SENDER : 0),
4454 log_write(0, LOG_MAIN |
4455 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4456 (LOGGING(received_sender) ? LOG_SENDER : 0),
4457 "rescind the above message-accept");
4459 Uunlink(spool_name);
4460 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4461 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4463 /* Claim a data ACL temp-reject, just to get reject logging and response */
4464 if (smtp_input) smtp_handle_acl_fail(ACL_WHERE_DATA, rc, NULL, log_msg);
4465 smtp_reply = US""; /* Indicate reply already sent */
4467 message_id[0] = 0; /* no message accepted */
4469 spool_data_file = NULL;
4472 /* Now reset signal handlers to their defaults */
4474 signal(SIGTERM, SIG_DFL);
4475 signal(SIGINT, SIG_DFL);
4477 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4478 value, which defaults TRUE - meaning there may be more incoming messages from
4479 this connection. For non-SMTP callers (where there is only ever one message),
4480 the default is FALSE. */
4486 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4487 is set to the response that should be sent. When it is NULL, we generate
4488 default responses. After an ACL error or local_scan() error, the response has
4489 already been sent, and smtp_reply is an empty string to indicate this. */
4491 if (!smtp_batched_input)
4495 if (fake_response != OK)
4496 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4497 3, SR_FINAL, fake_response_text);
4499 /* An OK response is required; use "message" text if present. */
4503 uschar *code = US"250";
4505 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4506 smtp_respond(code, len, SR_FINAL, user_msg);
4509 /* Default OK response */
4511 else if (chunking_state > CHUNKING_OFFERED)
4513 /* If there is more input waiting, no need to flush (probably the client
4514 pipelined QUIT after data). We check only the in-process buffer, not
4517 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4519 chunking_datasize, message_size+message_linecount, message_id);
4520 chunking_state = CHUNKING_OFFERED;
4523 smtp_printf("250 OK id=%s\r\n", receive_hasc(), message_id);
4527 "\n**** SMTP testing: that is not a real message id!\n\n");
4530 /* smtp_reply is set non-empty */
4532 else if (smtp_reply[0] != 0)
4533 if (fake_response != OK && smtp_reply[0] == '2')
4534 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4535 3, SR_FINAL, fake_response_text);
4537 smtp_printf("%.1024s\r\n", SP_NO_MORE, smtp_reply);
4539 switch (cutthrough_done)
4542 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4544 /* Delete spool files */
4545 Uunlink(spool_name);
4546 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4547 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4551 if (cutthrough.defer_pass)
4553 Uunlink(spool_name);
4554 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4555 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4560 if (cutthrough_done != NOT_TRIED)
4562 if (spool_data_file)
4564 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4565 spool_data_file = NULL;
4567 message_id[0] = 0; /* Prevent a delivery from starting */
4568 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4569 cutthrough.defer_pass = FALSE;
4573 /* For batched SMTP, generate an error message on failure, and do
4574 nothing on success. The function moan_smtp_batch() does not return -
4575 it exits from the program with a non-zero return code. */
4577 else if (smtp_reply)
4578 moan_smtp_batch(NULL, "%s", smtp_reply);
4582 /* If blackholing, we can immediately log this message's sad fate. The data
4583 file has already been unlinked, and the header file was never written to disk.
4584 We must now indicate that nothing was received, to prevent a delivery from
4589 const uschar *detail =
4590 #ifdef HAVE_LOCAL_SCAN
4591 local_scan_data ? string_printing(local_scan_data) :
4593 string_sprintf("(%s discarded recipients)", blackholed_by);
4594 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4595 log_write(0, LOG_MAIN, "Completed");
4599 /* Reset headers so that logging of rejects for a subsequent message doesn't
4600 include them. It is also important to set header_last = NULL before exiting
4601 from this function, as this prevents certain rewrites that might happen during
4602 subsequent verifying (of another incoming message) from trying to add headers
4603 when they shouldn't. */
4605 header_list = header_last = NULL;
4607 return yield; /* TRUE if more messages (SMTP only) */
4610 /* End of receive.c */