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 if (error_handling == ERRORS_SENDER)
1211 eblock.text1 = text1;
1212 eblock.text2 = US"";
1213 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1214 error_rc = EXIT_FAILURE;
1217 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1219 exim_exit(error_rc);
1224 /*************************************************
1225 * Add header lines set up by ACL *
1226 *************************************************/
1228 /* This function is called to add the header lines that were set up by
1229 statements in an ACL to the list of headers in memory. It is done in two stages
1230 like this, because when the ACL for RCPT is running, the other headers have not
1231 yet been received. This function is called twice; once just before running the
1232 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1233 are visible to the DATA ACL.
1235 Originally these header lines were added at the end. Now there is support for
1236 three different places: top, bottom, and after the Received: header(s). There
1237 will always be at least one Received: header, even if it is marked deleted, and
1238 even if something else has been put in front of it.
1241 acl_name text to identify which ACL
1247 add_acl_headers(int where, uschar * acl_name)
1249 header_line * last_received = NULL;
1253 case ACL_WHERE_DKIM:
1254 case ACL_WHERE_MIME:
1255 case ACL_WHERE_DATA:
1256 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1257 && (acl_removed_headers || acl_added_headers))
1259 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1260 " will not take effect on cutthrough deliveries");
1265 if (acl_removed_headers)
1267 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1269 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1271 const uschar * list = acl_removed_headers, * s;
1272 int sep = ':'; /* This is specified as a colon-separated list */
1274 /* If a list element has a leading '^' then it is an RE for
1275 the whole header, else just a header name. */
1276 while ((s = string_nextinlist(&list, &sep, NULL, 0)))
1279 regex_must_compile(s, MCS_CACHEABLE, FALSE),
1280 h->text, h->slen, NULL)
1282 || header_testname(h, s, Ustrlen(s), FALSE)
1285 h->type = htype_old;
1286 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1289 acl_removed_headers = NULL;
1290 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1293 if (!acl_added_headers) return;
1294 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1296 for (header_line * h = acl_added_headers, * next; h; h = next)
1303 h->next = header_list;
1305 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1311 last_received = header_list;
1312 while (!header_testname(last_received, US"Received", 8, FALSE))
1313 last_received = last_received->next;
1314 while (last_received->next &&
1315 header_testname(last_received->next, US"Received", 8, FALSE))
1316 last_received = last_received->next;
1318 h->next = last_received->next;
1319 last_received->next = h;
1320 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1324 /* add header before any header which is NOT Received: or Resent- */
1325 last_received = header_list;
1326 while ( last_received->next &&
1327 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1328 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1329 last_received = last_received->next;
1330 /* last_received now points to the last Received: or Resent-* header
1331 in an uninterrupted chain of those header types (seen from the beginning
1332 of all headers. Our current header must follow it. */
1333 h->next = last_received->next;
1334 last_received->next = h;
1335 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1340 header_last->next = h;
1341 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1345 if (!h->next) header_last = h;
1347 /* Check for one of the known header types (From:, To:, etc.) though in
1348 practice most added headers are going to be "other". Lower case
1349 identification letters are never stored with the header; they are used
1350 for existence tests when messages are received. So discard any lower case
1353 h->type = header_checkname(h, FALSE);
1354 if (h->type >= 'a') h->type = htype_other;
1356 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1359 acl_added_headers = NULL;
1360 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1365 /*************************************************
1366 * Add host information for log line *
1367 *************************************************/
1369 /* Called for acceptance and rejecting log lines. This adds information about
1370 the calling host to a string that is being built dynamically.
1373 s the dynamic string
1375 Returns: the extended string
1379 add_host_info_for_log(gstring * g)
1381 if (sender_fullhost)
1383 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1384 g = string_catn(g, US" DS", 3);
1385 g = string_append(g, 2, US" H=", sender_fullhost);
1386 if (LOGGING(incoming_interface) && interface_address)
1387 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1389 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1391 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1392 f.tcp_in_fastopen_logged = TRUE;
1395 g = string_append(g, 2, US" U=", sender_ident);
1396 if (LOGGING(connection_id))
1397 g = string_fmt_append(g, " Ci=%lu", connection_id);
1398 if (received_protocol)
1399 g = string_append(g, 2, US" P=", received_protocol);
1400 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1402 g = string_catn(g, US" L", 2);
1403 #ifndef DISABLE_PIPE_CONNECT
1404 if (f.smtp_in_early_pipe_used)
1405 g = string_catn(g, US"*", 1);
1406 else if (f.smtp_in_early_pipe_advertised)
1407 g = string_catn(g, US".", 1);
1409 if (!f.smtp_in_pipelining_used)
1410 g = string_catn(g, US"-", 1);
1417 #ifdef WITH_CONTENT_SCAN
1419 /*************************************************
1420 * Run the MIME ACL on a message *
1421 *************************************************/
1423 /* This code is in a subroutine so that it can be used for both SMTP
1424 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1427 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1428 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1429 smtp_reply_ptr Where SMTP reply is being built
1430 blackholed_by_ptr Where "blackholed by" message is being built
1432 Returns: TRUE to carry on; FALSE to abandon the message
1436 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1437 uschar **blackholed_by_ptr)
1440 uschar * rfc822_file_path = NULL;
1441 unsigned long mbox_size;
1442 uschar *user_msg, *log_msg;
1443 int mime_part_count_buffer = -1;
1444 uschar * mbox_filename;
1447 /* check if it is a MIME message */
1449 for (header_line * my_headerlist = header_list; my_headerlist;
1450 my_headerlist = my_headerlist->next)
1451 if ( my_headerlist->type != '*' /* skip deleted headers */
1452 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1455 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1459 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1464 /* make sure the eml mbox file is spooled up */
1465 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1466 { /* error while spooling */
1467 log_write(0, LOG_MAIN|LOG_PANIC,
1468 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1469 Uunlink(spool_name);
1471 #ifdef EXPERIMENTAL_DCC
1474 smtp_respond(US"451", 3, SR_FINAL, US"temporary local problem");
1475 message_id[0] = 0; /* Indicate no message accepted */
1476 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1477 return FALSE; /* Indicate skip to end of receive function */
1483 mime_part_count = -1;
1484 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1485 (void)fclose(mbox_file);
1487 if (rfc822_file_path)
1489 mime_part_count = mime_part_count_buffer;
1491 if (unlink(CS rfc822_file_path) == -1)
1493 log_write(0, LOG_PANIC,
1494 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1497 rfc822_file_path = NULL;
1500 /* check if we must check any message/rfc822 attachments */
1503 uschar * scandir = string_copyn(mbox_filename,
1504 Ustrrchr(mbox_filename, '/') - mbox_filename);
1505 struct dirent * entry;
1508 for (tempdir = exim_opendir(scandir); entry = readdir(tempdir); )
1509 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1511 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1513 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1519 if (rfc822_file_path)
1521 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1523 /* set RFC822 expansion variable */
1525 mime_part_count_buffer = mime_part_count;
1526 goto MIME_ACL_CHECK;
1528 log_write(0, LOG_PANIC,
1529 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1530 unlink(CS rfc822_file_path);
1535 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1538 recipients_count = 0;
1539 *blackholed_by_ptr = US"MIME ACL";
1540 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1544 Uunlink(spool_name);
1545 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1547 #ifdef EXPERIMENTAL_DCC
1552 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1553 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1554 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1556 message_id[0] = 0; /* Indicate no message accepted */
1557 return FALSE; /* Cause skip to end of receive function */
1563 #endif /* WITH_CONTENT_SCAN */
1568 received_header_gen(void)
1571 uschar * timestamp = expand_string(US"${tod_full}");
1572 header_line * received_header= header_list;
1574 if (recipients_count == 1) received_for = recipients_list[0].address;
1575 received = expand_string(received_header_text);
1576 received_for = NULL;
1580 if(spool_name[0] != 0)
1581 Uunlink(spool_name); /* Lose the data file */
1582 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1583 "(received_header_text) failed: %s", string_printing(received_header_text),
1584 expand_string_message);
1587 /* The first element on the header chain is reserved for the Received header,
1588 so all we have to do is fill in the text pointer, and set the type. However, if
1589 the result of the expansion is an empty string, we leave the header marked as
1590 "old" so as to refrain from adding a Received header. */
1594 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1595 received_header->type = htype_old;
1599 received_header->text = string_sprintf("%s;\n\t%s\n", received, timestamp);
1600 received_header->type = htype_received;
1603 received_header->slen = Ustrlen(received_header->text);
1605 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1606 received_header->type, received_header->text);
1611 /*************************************************
1613 *************************************************/
1615 /* Receive a message on the given input, and put it into a pair of spool files.
1616 Either a non-null list of recipients, or the extract flag will be true, or
1617 both. The flag sender_local is true for locally generated messages. The flag
1618 submission_mode is true if an ACL has obeyed "control = submission". The flag
1619 suppress_local_fixups is true if an ACL has obeyed "control =
1620 suppress_local_fixups" or -G was passed on the command-line.
1621 The flag smtp_input is true if the message is to be
1622 handled using SMTP conventions about termination and lines starting with dots.
1623 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1625 If a message was successfully read, message_id[0] will be non-zero.
1627 The general actions of this function are:
1629 . Read the headers of the message (if any) into a chain of store
1632 . If there is a "sender:" header and the message is locally originated,
1633 throw it away, unless the caller is trusted, or unless
1634 active_local_sender_retain is set - which can only happen if
1635 active_local_from_check is false.
1637 . If recipients are to be extracted from the message, build the
1638 recipients list from the headers, removing any that were on the
1639 original recipients list (unless extract_addresses_remove_arguments is
1640 false), and at the same time, remove any bcc header that may be present.
1642 . Get the spool file for the data, sort out its unique name, open
1643 and lock it (but don't give it the name yet).
1645 . Generate a "Message-Id" header if the message doesn't have one, for
1646 locally-originated messages.
1648 . Generate a "Received" header.
1650 . Ensure the recipients list is fully qualified and rewritten if necessary.
1652 . If there are any rewriting rules, apply them to the sender address
1653 and also to the headers.
1655 . If there is no from: header, generate one, for locally-generated messages
1656 and messages in "submission mode" only.
1658 . If the sender is local, check that from: is correct, and if not, generate
1659 a Sender: header, unless message comes from a trusted caller, or this
1660 feature is disabled by active_local_from_check being false.
1662 . If there is no "date" header, generate one, for locally-originated
1663 or submission mode messages only.
1665 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1666 dot_ends mode, to the data file. Leave it open, to hold the lock.
1668 . Write the envelope and the headers to a new file.
1670 . Set the name for the header file; close it.
1672 . Set the name for the data file; close it.
1674 Because this function can potentially be called many times in a single
1675 SMTP connection, all store should be got by store_get(), so that it will be
1676 automatically retrieved after the message is accepted.
1678 FUDGE: It seems that sites on the net send out messages with just LF
1679 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1680 we make the CRs optional in all cases.
1682 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1683 new regime is now in place in which bare CRs in header lines are turned into LF
1684 followed by a space, so as not to terminate the header line.
1686 February 2004: A bare LF in a header line in a message whose first line was
1687 terminated by CRLF is treated in the same way as a bare CR.
1690 extract_recip TRUE if recipients are to be extracted from the message's
1693 Returns: TRUE there are more messages to be read (SMTP input)
1694 FALSE there are no more messages to be read (non-SMTP input
1695 or SMTP connection collapsed, or other failure)
1697 When reading a message for filter testing, the returned value indicates
1698 whether the headers (which is all that is read) were terminated by '.' or
1702 receive_msg(BOOL extract_recip)
1706 int process_info_len = Ustrlen(process_info);
1707 int error_rc = error_handling == ERRORS_SENDER
1708 ? errors_sender_rc : EXIT_FAILURE;
1709 int header_size = 256;
1711 int prevlines_length = 0;
1712 const int id_resolution = BASE_62 == 62 && !host_number_string ? 1
1713 : BASE_62 != 62 && host_number_string ? 4
1718 BOOL contains_resent_headers = FALSE;
1719 BOOL extracted_ignored = FALSE;
1720 BOOL first_line_ended_crlf = TRUE_UNSET;
1721 BOOL smtp_yield = TRUE;
1724 BOOL resents_exist = FALSE;
1725 uschar *resent_prefix = US"";
1726 uschar *blackholed_by = NULL;
1727 uschar *blackhole_log_msg = US"";
1728 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1731 error_block *bad_addresses = NULL;
1733 uschar *frozen_by = NULL;
1734 uschar *queued_by = NULL;
1737 rmark rcvd_log_reset_point;
1739 struct stat statbuf;
1741 /* Final message to give to SMTP caller, and messages from ACLs */
1743 uschar *smtp_reply = NULL;
1744 uschar *user_msg, *log_msg;
1746 /* Working header pointers */
1751 /* Flags for noting the existence of certain headers (only one left) */
1753 BOOL date_header_exists = FALSE;
1755 /* Pointers to receive the addresses of headers whose contents we need. */
1757 header_line *from_header = NULL;
1758 header_line *subject_header = NULL;
1759 header_line *msgid_header = NULL;
1760 header_line *received_header;
1761 BOOL msgid_header_newly_created = FALSE;
1763 /* Variables for use when building the Received: header. */
1768 /* Time of creation of message_id */
1770 static struct timeval message_id_tv = { 0, 0 };
1773 /* Release any open files that might have been cached while preparing to
1774 accept the message - e.g. by verifying addresses - because reading a message
1775 might take a fair bit of real time. */
1779 /* Extracting the recipient list from an input file is incompatible with
1780 cutthrough delivery with the no-spool option. It shouldn't be possible
1781 to set up the combination, but just in case kill any ongoing connection. */
1782 if (extract_recip || !smtp_input)
1783 cancel_cutthrough_connection(TRUE, US"not smtp input");
1785 /* Initialize the chain of headers by setting up a place-holder for Received:
1786 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1787 pointing to the end of the chain to make adding headers simple. */
1789 received_header = header_list = header_last = store_get(sizeof(header_line), GET_UNTAINTED);
1790 header_list->next = NULL;
1791 header_list->type = htype_old;
1792 header_list->text = NULL;
1793 header_list->slen = 0;
1795 /* Control block for the next header to be read.
1796 The data comes from the message, so is tainted. */
1798 reset_point = store_mark();
1799 next = store_get(sizeof(header_line), GET_UNTAINTED);
1800 next->text = store_get(header_size, GET_TAINTED);
1802 /* Initialize message id to be null (indicating no message read), and the
1803 header names list to be the normal list. Indicate there is no data file open
1804 yet, initialize the size and warning count, and deal with no size limit. */
1807 spool_data_file = NULL;
1812 received_count = 1; /* For the one we will add */
1814 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1816 /* While reading the message, the following counts are computed. */
1818 message_linecount = body_linecount = body_zerocount =
1819 max_received_linelength = 0;
1821 #ifdef WITH_CONTENT_SCAN
1822 /* reset non-per-part mime variables */
1823 mime_is_coverletter = 0;
1825 mime_part_count = -1;
1828 #ifndef DISABLE_DKIM
1829 /* Call into DKIM to set up the context. In CHUNKING mode
1830 we clear the dot-stuffing flag */
1831 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1832 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1835 #ifdef SUPPORT_DMARC
1836 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1839 /* In SMTP sessions we may receive several messages in one connection. Before
1840 each subsequent one, we wait for the clock to tick at the level of message-id
1842 This is so that the combination of time+pid is unique, even on systems where the
1843 pid can be re-used within our time interval. We can't shorten the interval
1844 without re-designing the message-id. See comments above where the message id is
1845 created. This is Something For The Future.
1846 Do this wait any time we have previously created a message-id, even if we
1847 rejected the message. This gives unique IDs for logging done by ACLs.
1848 The initial timestamp must have been obtained via exim_gettime() to avoid
1849 issues on Linux with suspend/resume. */
1851 if (message_id_tv.tv_sec)
1853 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
1854 exim_wait_tick(&message_id_tv, id_resolution);
1857 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1858 ids, and fractions of a second are required. See the comments that precede the
1859 message id creation below.
1860 We use a routine that if possible uses a monotonic clock, and can be used again
1861 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1864 exim_gettime(&message_id_tv);
1866 /* For other uses of the received time we can operate with granularity of one
1867 second, and for that we use the global variable received_time. This is for
1868 things like ultimate message timeouts.
1869 For this we do not care about the Linux suspend/resume problem, so rather than
1870 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1872 gettimeofday(&received_time, NULL);
1874 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1875 happen in the smtp_getc() function when it refills its buffer. */
1877 had_data_timeout = 0;
1879 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1881 /* If not SMTP input, timeout happens only if configured, and we just set a
1882 single timeout for the whole message. */
1884 else if (receive_timeout > 0)
1886 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1887 ALARM(receive_timeout);
1890 /* SIGTERM and SIGINT are caught always. */
1892 had_data_sigint = 0;
1893 signal(SIGTERM, data_sigterm_sigint_handler);
1894 signal(SIGINT, data_sigterm_sigint_handler);
1896 /* Header lines in messages are not supposed to be very long, though when
1897 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1898 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1899 storing the header, and extend this as necessary using string_cat().
1901 To cope with total lunacies, impose an upper limit on the length of the header
1902 section of the message, as otherwise the store will fill up. We must also cope
1903 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1904 Folded header lines are joined into one string, leaving the '\n' characters
1905 inside them, so that writing them out reproduces the input.
1907 Loop for each character of each header; the next structure for chaining the
1908 header is set up already, with ptr the offset of the next character in
1913 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1915 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1916 SMTP must have a correct "." terminator. */
1918 if (smtp_input /* && !smtp_batched_input */)
1921 smtp_reply = handle_lost_connection(US" (header)");
1923 goto TIDYUP; /* Skip to end of function */
1928 /* See if we are at the current header's size limit - there must be at least
1929 four bytes left. This allows for the new character plus a zero, plus two for
1930 extra insertions when we are playing games with dots and carriage returns. If
1931 we are at the limit, extend the text buffer. This could have been done
1932 automatically using string_cat() but because this is a tightish loop storing
1933 only one character at a time, we choose to do it inline. Normally
1934 store_extend() will be able to extend the block; only at the end of a big
1935 store block will a copy be needed. To handle the case of very long headers
1936 (and sometimes lunatic messages can have ones that are 100s of K long) we
1937 call store_release() for strings that have been copied - if the string is at
1938 the start of a block (and therefore the only thing in it, because we aren't
1939 doing any other gets), the block gets freed. We can only do this release if
1940 there were no allocations since the once that we want to free. */
1942 if (ptr >= header_size - 4)
1944 int oldsize = header_size;
1946 if (header_size >= INT_MAX/2)
1950 if (!store_extend(next->text, oldsize, header_size))
1951 next->text = store_newblock(next->text, header_size, ptr);
1954 /* Cope with receiving a binary zero. There is dispute about whether
1955 these should be allowed in RFC 822 messages. The middle view is that they
1956 should not be allowed in headers, at least. Exim takes this attitude at
1957 the moment. We can't just stomp on them here, because we don't know that
1958 this line is a header yet. Set a flag to cause scanning later. */
1960 if (ch == 0) had_zero++;
1962 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1963 those from data files use just LF. Treat LF in local SMTP input as a
1964 terminator too. Treat EOF as a line terminator always. */
1966 if (ch < 0) goto EOL;
1968 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1969 other MTAs accept this. We are therefore forced into this "liberalisation"
1970 too, so we accept LF as a line terminator whatever the source of the message.
1971 However, if the first line of the message ended with a CRLF, we treat a bare
1972 LF specially by inserting a white space after it to ensure that the header
1973 line is not terminated. */
1977 if (first_line_ended_crlf == TRUE_UNSET)
1978 first_line_ended_crlf = FALSE;
1979 else if (first_line_ended_crlf)
1980 receive_ungetc(' ');
1984 /* This is not the end of the line. If this is SMTP input and this is
1985 the first character in the line and it is a "." character, ignore it.
1986 This implements the dot-doubling rule, though header lines starting with
1987 dots aren't exactly common. They are legal in RFC 822, though. If the
1988 following is CRLF or LF, this is the line that that terminates the
1990 entire message. We set message_ended to indicate this has happened (to
1991 prevent further reading), and break out of the loop, having freed the
1992 empty header, and set next = NULL to indicate no data line. */
1994 if (f.dot_ends && ptr == 0 && ch == '.')
1996 /* leading dot while in headers-read mode */
1997 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1998 if (ch == '\n' && first_line_ended_crlf == TRUE /* and not TRUE_UNSET */ )
1999 /* dot, LF but we are in CRLF mode. Attack? */
2000 ch = ' '; /* replace the LF with a space */
2002 else if (ch == '\r')
2004 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2007 if (ch >= 0) receive_ungetc(ch);
2008 ch = '\r'; /* Revert to CR */
2013 message_ended = END_DOT;
2014 reset_point = store_reset(reset_point);
2016 break; /* End character-reading loop */
2019 /* For non-SMTP input, the dot at the start of the line was really a data
2020 character. What is now in ch is the following character. We guaranteed
2021 enough space for this above. */
2025 next->text[ptr++] = '.';
2030 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
2031 remember this case if this is the first line ending. */
2035 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2038 if (first_line_ended_crlf == TRUE_UNSET)
2039 first_line_ended_crlf = TRUE;
2043 /* Otherwise, put back the character after CR, and turn the bare CR
2046 if (ch >= 0) (receive_ungetc)(ch);
2047 next->text[ptr++] = '\n';
2052 /* We have a data character for the header line. */
2054 next->text[ptr++] = ch; /* Add to buffer */
2055 message_size++; /* Total message size so far */
2057 /* Handle failure due to a humungously long header section. The >= allows
2058 for the terminating \n. Add what we have so far onto the headers list so
2059 that it gets reflected in any error message, and back up the just-read
2062 if (message_size >= header_maxsize)
2065 next->text[ptr] = 0;
2067 next->type = htype_other;
2069 header_last->next = next;
2072 log_write(0, LOG_MAIN, "ridiculously long message header received from "
2073 "%s (more than %d characters): message abandoned",
2074 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
2078 smtp_reply = US"552 Message header is ridiculously long";
2079 receive_swallow_smtp();
2080 goto TIDYUP; /* Skip to end of function */
2085 give_local_error(ERRMESS_VLONGHEADER,
2086 string_sprintf("message header longer than %d characters received: "
2087 "message not accepted", header_maxsize), US"", error_rc, stdin,
2089 /* Does not return */
2093 continue; /* With next input character */
2095 /* End of header line reached */
2099 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2101 receive_linecount++;
2102 message_linecount++;
2104 /* Keep track of maximum line length */
2106 if (ptr - prevlines_length > max_received_linelength)
2107 max_received_linelength = ptr - prevlines_length;
2108 prevlines_length = ptr + 1;
2110 /* Now put in the terminating newline. There is always space for
2111 at least two more characters. */
2113 next->text[ptr++] = '\n';
2116 /* A blank line signals the end of the headers; release the unwanted
2117 space and set next to NULL to indicate this. */
2121 reset_point = store_reset(reset_point);
2126 /* There is data in the line; see if the next input character is a
2127 whitespace character. If it is, we have a continuation of this header line.
2128 There is always space for at least one character at this point. */
2132 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2133 if (nextch == ' ' || nextch == '\t')
2135 next->text[ptr++] = nextch;
2136 if (++message_size >= header_maxsize)
2138 continue; /* Iterate the loop */
2140 else if (nextch >= 0) /* not EOF, ERR etc */
2141 (receive_ungetc)(nextch); /* For next time */
2142 else ch = nextch; /* Cause main loop to exit at end */
2145 /* We have got to the real line end. Terminate the string and release store
2146 beyond it. If it turns out to be a real header, internal binary zeros will
2147 be squashed later. */
2149 next->text[ptr] = 0;
2151 store_release_above(next->text + ptr + 1);
2153 /* Check the running total size against the overall message size limit. We
2154 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2155 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2156 headers - the code to read the body will then also hit the buffer. */
2158 if (message_size > thismessage_size_limit) break;
2160 /* A line that is not syntactically correct for a header also marks
2161 the end of the headers. In this case, we leave next containing the
2162 first data line. This might actually be several lines because of the
2163 continuation logic applied above, but that doesn't matter.
2165 It turns out that smail, and presumably sendmail, accept leading lines
2168 From ph10 Fri Jan 5 12:35 GMT 1996
2170 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2171 find any documentation of this, but for compatibility it had better be
2172 accepted. Exim restricts it to the case of non-smtp messages, and
2173 treats it as an alternative to the -f command line option. Thus it is
2174 ignored except for trusted users or filter testing. Otherwise it is taken
2175 as the sender address, unless -f was used (sendmail compatibility).
2177 It further turns out that some UUCPs generate the From_line in a different
2180 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2182 The regex for matching these things is now capable of recognizing both
2183 formats (including 2- and 4-digit years in the latter). In fact, the regex
2184 is now configurable, as is the expansion string to fish out the sender.
2186 Even further on it has been discovered that some broken clients send
2187 these lines in SMTP messages. There is now an option to ignore them from
2188 specified hosts or networks. Sigh. */
2190 if ( header_last == header_list
2192 || ( sender_host_address
2193 && verify_check_host(&ignore_fromline_hosts) == OK
2195 || (!sender_host_address && ignore_fromline_local)
2197 && regex_match_and_setup(regex_From, next->text, 0, -1)
2200 if (!f.sender_address_forced)
2202 uschar *uucp_sender = expand_string(uucp_from_sender);
2204 log_write(0, LOG_MAIN|LOG_PANIC,
2205 "expansion of \"%s\" failed after matching "
2206 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2209 int start, end, domain;
2211 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2212 &start, &end, &domain, TRUE);
2215 if (domain == 0 && newsender[0] != 0)
2216 /* deconst ok as newsender was not const */
2217 newsender = US rewrite_address_qualify(newsender, FALSE);
2219 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2221 sender_address = newsender;
2223 if (f.trusted_caller || filter_test != FTEST_NONE)
2225 authenticated_sender = NULL;
2226 originator_name = US"";
2227 f.sender_local = FALSE;
2230 if (filter_test != FTEST_NONE)
2231 printf("Sender taken from \"From \" line\n");
2238 /* Not a leading "From " line. Check to see if it is a valid header line.
2239 Header names may contain any non-control characters except space and colon,
2244 uschar * p = next->text;
2246 /* If not a valid header line, break from the header reading loop, leaving
2247 next != NULL, indicating that it holds the first line of the body. */
2249 if (isspace(*p)) break;
2250 while (mac_isgraph(*p) && *p != ':') p++;
2251 while (isspace(*p)) p++;
2254 body_zerocount = had_zero;
2258 /* We have a valid header line. If there were any binary zeroes in
2259 the line, stomp on them here. */
2262 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2265 /* It is perfectly legal to have an empty continuation line
2266 at the end of a header, but it is confusing to humans
2267 looking at such messages, since it looks like a blank line.
2268 Reduce confusion by removing redundant white space at the
2269 end. We know that there is at least one printing character
2270 (the ':' tested for above) so there is no danger of running
2273 p = next->text + ptr - 2;
2276 while (*p == ' ' || *p == '\t') p--;
2277 if (*p != '\n') break;
2278 ptr = (p--) - next->text + 1;
2279 message_size -= next->slen - ptr;
2280 next->text[ptr] = 0;
2284 /* Add the header to the chain */
2286 next->type = htype_other;
2288 header_last->next = next;
2291 /* Check the limit for individual line lengths. This comes after adding to
2292 the chain so that the failing line is reflected if a bounce is generated
2293 (for a local message). */
2295 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2297 log_write(0, LOG_MAIN, "overlong message header line received from "
2298 "%s (more than %d characters): message abandoned",
2299 f.sender_host_unknown ? sender_ident : sender_fullhost,
2300 header_line_maxsize);
2304 smtp_reply = US"552 A message header line is too long";
2305 receive_swallow_smtp();
2306 goto TIDYUP; /* Skip to end of function */
2310 give_local_error(ERRMESS_VLONGHDRLINE,
2311 string_sprintf("message header line longer than %d characters "
2312 "received: message not accepted", header_line_maxsize), US"",
2313 error_rc, stdin, header_list->next);
2314 /* Does not return */
2317 /* Note if any resent- fields exist. */
2319 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2321 resents_exist = TRUE;
2322 resent_prefix = US"Resent-";
2326 /* Reject CHUNKING messages that do not CRLF their first header line */
2328 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2330 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2331 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2333 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2334 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2335 smtp_printf("552 Message header not CRLF terminated\r\n", SP_NO_MORE);
2338 goto TIDYUP; /* Skip to end of function */
2341 /* The line has been handled. If we have hit EOF, break out of the loop,
2342 indicating no pending data line and no more data for the message */
2347 if (ch == EOF) message_ended = END_DOT;
2348 else if (ch == ERR) message_ended = END_PROTOCOL;
2352 /* Set up for the next header */
2354 reset_point = store_mark();
2356 next = store_get(sizeof(header_line), GET_UNTAINTED);
2357 next->text = store_get(header_size, GET_TAINTED);
2360 prevlines_length = 0;
2361 } /* Continue, starting to read the next header */
2363 /* At this point, we have read all the headers into a data structure in main
2364 store. The first header is still the dummy placeholder for the Received: header
2365 we are going to generate a bit later on. If next != NULL, it contains the first
2366 data line - which terminated the headers before reaching a blank line (not the
2371 debug_printf(">>Headers received:\n");
2372 for (header_line * h = header_list->next; h; h = h->next)
2373 debug_printf("%s", h->text);
2377 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2378 is dropped immediately after valid headers, the next thing we will see is EOF.
2379 We must test for this specially, as further down the reading of the data is
2380 skipped if already at EOF.
2381 In CHUNKING mode, a protocol error makes us give up on the message. */
2384 if ((receive_feof)())
2386 smtp_reply = handle_lost_connection(US" (after header)");
2388 goto TIDYUP; /* Skip to end of function */
2390 else if (message_ended == END_PROTOCOL)
2392 smtp_reply = US""; /* no reply needed */
2396 /* If this is a filter test run and no headers were read, output a warning
2397 in case there is a mistake in the test message. */
2399 if (filter_test != FTEST_NONE && header_list->next == NULL)
2400 printf("Warning: no message headers read\n");
2403 /* Scan the headers to identify them. Some are merely marked for later
2404 processing; some are dealt with here. */
2406 for (header_line * h = header_list->next; h; h = h->next)
2408 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2409 if (is_resent) contains_resent_headers = TRUE;
2411 switch (header_checkname(h, is_resent))
2414 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2418 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2421 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2424 if (!resents_exist || is_resent) date_header_exists = TRUE;
2427 /* Same comments as about Return-Path: below. */
2429 case htype_delivery_date:
2430 if (delivery_date_remove) h->type = htype_old;
2433 /* Same comments as about Return-Path: below. */
2435 case htype_envelope_to:
2436 if (envelope_to_remove) h->type = htype_old;
2439 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2440 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2441 header consists of just the login id of the user who called Exim, rewrite
2442 it with the gecos field first. Apply this rule to Resent-From: if there
2443 are resent- fields. */
2446 h->type = htype_from;
2447 if (!resents_exist || is_resent)
2453 uschar *s = Ustrchr(h->text, ':') + 1;
2454 while (isspace(*s)) s++;
2455 len = h->slen - (s - h->text) - 1;
2456 if (Ustrlen(originator_login) == len &&
2457 strncmpic(s, originator_login, len) == 0)
2459 uschar *name = is_resent? US"Resent-From" : US"From";
2460 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2461 originator_login, qualify_domain_sender);
2462 from_header = header_last;
2463 h->type = htype_old;
2464 DEBUG(D_receive|D_rewrite)
2465 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2471 /* Identify the Message-id: header for generating "in-reply-to" in the
2472 autoreply transport. For incoming logging, save any resent- value. In both
2473 cases, take just the first of any multiples. */
2476 if (!msgid_header && (!resents_exist || is_resent))
2483 /* Flag all Received: headers */
2485 case htype_received:
2486 h->type = htype_received;
2490 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2492 case htype_reply_to:
2493 h->type = htype_reply_to;
2496 /* The Return-path: header is supposed to be added to messages when
2497 they leave the SMTP system. We shouldn't receive messages that already
2498 contain Return-path. However, since Exim generates Return-path: on
2499 local delivery, resent messages may well contain it. We therefore
2500 provide an option (which defaults on) to remove any Return-path: headers
2501 on input. Removal actually means flagging as "old", which prevents the
2502 header being transmitted with the message. */
2504 case htype_return_path:
2505 if (return_path_remove) h->type = htype_old;
2507 /* If we are testing a mail filter file, use the value of the
2508 Return-Path: header to set up the return_path variable, which is not
2509 otherwise set. However, remove any <> that surround the address
2510 because the variable doesn't have these. */
2512 if (filter_test != FTEST_NONE)
2514 uschar *start = h->text + 12;
2515 uschar *end = start + Ustrlen(start);
2516 while (isspace(*start)) start++;
2517 while (end > start && isspace(end[-1])) end--;
2518 if (*start == '<' && end[-1] == '>')
2523 return_path = string_copyn(start, end - start);
2524 printf("Return-path taken from \"Return-path:\" header line\n");
2528 /* If there is a "Sender:" header and the message is locally originated,
2529 and from an untrusted caller and suppress_local_fixups is not set, or if we
2530 are in submission mode for a remote message, mark it "old" so that it will
2531 not be transmitted with the message, unless active_local_sender_retain is
2532 set. (This can only be true if active_local_from_check is false.) If there
2533 are any resent- headers in the message, apply this rule to Resent-Sender:
2534 instead of Sender:. Messages with multiple resent- header sets cannot be
2535 tidily handled. (For this reason, at least one MUA - Pine - turns old
2536 resent- headers into X-resent- headers when resending, leaving just one
2540 h->type = !f.active_local_sender_retain
2541 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2542 || f.submission_mode
2544 && (!resents_exist || is_resent)
2545 ? htype_old : htype_sender;
2548 /* Remember the Subject: header for logging. There is no Resent-Subject */
2554 /* "To:" gets flagged, and the existence of a recipient header is noted,
2555 whether it's resent- or not. */
2560 to_or_cc_header_exists = TRUE;
2566 /* Extract recipients from the headers if that is required (the -t option).
2567 Note that this is documented as being done *before* any address rewriting takes
2568 place. There are two possibilities:
2570 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2571 recipients already listed are to be REMOVED from the message. Smail 3 works
2572 like this. We need to build a non-recipients tree for that list, because in
2573 subsequent processing this data is held in a tree and that's what the
2574 spool_write_header() function expects. Make sure that non-recipient addresses
2575 are fully qualified and rewritten if necessary.
2577 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2578 those in the command line arguments (and it is rumoured some other MTAs do
2579 this). Therefore, there is an option to make Exim behave this way.
2581 *** Notes on "Resent-" header lines ***
2583 The presence of resent-headers in the message makes -t horribly ambiguous.
2584 Experiments with sendmail showed that it uses recipients for all resent-
2585 headers, totally ignoring the concept of "sets of resent- headers" as described
2586 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2587 with all the addresses in one instance of each header.
2589 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2590 error for -t if there were resent- headers in the message. However, after a
2591 discussion on the mailing list, I've learned that there are MUAs that use
2592 resent- headers with -t, and also that the stuff about sets of resent- headers
2593 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2594 message with -t and resent- header lines makes sure that only *its* resent-
2595 headers are present; previous ones are often renamed as X-resent- for example.
2597 Consequently, Exim has been changed so that, if any resent- header lines are
2598 present, the recipients are taken from all of the appropriate resent- lines,
2599 and not from the ordinary To:, Cc:, etc. */
2604 error_block **bnext = &bad_addresses;
2606 if (extract_addresses_remove_arguments)
2608 while (recipients_count-- > 0)
2610 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2611 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2612 tree_add_nonrecipient(s);
2614 recipients_list = NULL;
2615 recipients_count = recipients_list_max = 0;
2618 /* Now scan the headers */
2620 for (header_line * h = header_list->next; h; h = h->next)
2622 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2623 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2625 uschar *s = Ustrchr(h->text, ':') + 1;
2626 while (isspace(*s)) s++;
2628 f.parse_allow_group = TRUE; /* Allow address group syntax */
2632 uschar *ss = parse_find_address_end(s, FALSE);
2633 uschar *recipient, *errmess, *pp;
2634 int start, end, domain;
2636 /* Check on maximum */
2638 if (recipients_max > 0 && ++rcount > recipients_max)
2639 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2640 US"message rejected: ", error_rc, stdin, NULL);
2641 /* Does not return */
2643 /* Make a copy of the address, and remove any internal newlines. These
2644 may be present as a result of continuations of the header line. The
2645 white space that follows the newline must not be removed - it is part
2648 pp = recipient = store_get(ss - s + 1, s);
2649 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2654 BOOL b = allow_utf8_domains;
2655 allow_utf8_domains = TRUE;
2657 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2662 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2663 else allow_utf8_domains = b;
2669 /* Keep a list of all the bad addresses so we can send a single
2670 error message at the end. However, an empty address is not an error;
2671 just ignore it. This can come from an empty group list like
2673 To: Recipients of list:;
2675 If there are no recipients at all, an error will occur later. */
2677 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2679 int len = Ustrlen(s);
2680 error_block * b = store_get(sizeof(error_block), GET_UNTAINTED);
2681 while (len > 0 && isspace(s[len-1])) len--;
2683 b->text1 = string_printing(string_copyn(s, len));
2689 /* If the recipient is already in the nonrecipients tree, it must
2690 have appeared on the command line with the option extract_addresses_
2691 remove_arguments set. Do not add it to the recipients, and keep a note
2692 that this has happened, in order to give a better error if there are
2693 no recipients left. */
2697 if (tree_search(tree_nonrecipients, recipient) == NULL)
2698 receive_add_recipient(recipient, -1);
2700 extracted_ignored = TRUE;
2703 /* Move on past this address */
2705 s = ss + (*ss ? 1 : 0);
2706 while (isspace(*s)) s++;
2707 } /* Next address */
2709 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2710 f.parse_found_group = FALSE;
2712 /* If this was the bcc: header, mark it "old", which means it
2713 will be kept on the spool, but not transmitted as part of the
2716 if (h->type == htype_bcc) h->type = htype_old;
2717 } /* For appropriate header line */
2718 } /* For each header line */
2722 /* Now build the unique message id. This has changed several times over the
2723 lifetime of Exim, and is changing for Exim 4.97.
2724 The previous change was in about 2003.
2726 Detail for the pre-4.97 version is here in [square-brackets].
2728 The message ID has 3 parts: tttttt-ppppppppppp-ssss (6, 11, 4 - total 23 with
2729 the dashes). Each part is a number in base 62.
2730 [ tttttt-pppppp-ss 6, 6, 2 => 16 ]
2732 The first part is the current time, in seconds. Six chars is enough until
2733 year 3700 with case-sensitive filesystes, but will run out in 2038 on
2734 case-insensitive ones (Cygwin, Darwin - where we have to use base-36.
2735 Both of those are in the "unsupported" bucket, so ignore for now).
2737 The second part is the current pid, and supports 64b [31b] PIDs.
2739 The third part holds sub-second time, plus (when localhost_number is set)
2740 the host number multiplied by a number large enough to keep it away from
2741 the time portion. Host numbers are restricted to the range 0-16.
2742 The time resolution is variously 1, 2 or 4 microseconds [0.5 or 1 ms]
2743 depending on the use of localhost_nubmer and of case-insensitive filesystems.
2745 After a message has been received, Exim ensures that the timer has ticked at the
2746 appropriate level before proceeding, to avoid duplication if the pid happened to
2747 be re-used within the same time period. It seems likely that most messages will
2748 take at least half a millisecond to be received, so no delay will normally be
2749 necessary. At least for some time...
2751 Note that string_base62_XX() returns its data in a static storage block, so it
2752 must be copied before calling string_base62_XXX) again. It always returns exactly
2753 11 (_64) or 6 (_32) characters.
2755 There doesn't seem to be anything in the RFC which requires a message id to
2756 start with a letter, but Smail was changed to ensure this. The external form of
2757 the message id (as supplied by string expansion) therefore starts with an
2758 additional leading 'E'. The spool file names do not include this leading
2759 letter and it is not used internally.
2761 NOTE: If ever the format of message ids is changed, the regular expression for
2762 checking that a string is in this format must be updated in a corresponding
2763 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2764 must also be changed to reflect the correct string length. The queue-sort code
2765 needs to know the layout. Then, of course, other programs that rely on the
2766 message id format will need updating too (inc. at least exim_msgdate). */
2768 Ustrncpy(message_id, string_base62_32((long int)(message_id_tv.tv_sec)), MESSAGE_ID_TIME_LEN);
2769 message_id[MESSAGE_ID_TIME_LEN] = '-';
2770 Ustrncpy(message_id + MESSAGE_ID_TIME_LEN + 1,
2771 string_base62_64((long int)getpid()),
2775 /* Deal with the case where the host number is set. The value of the number was
2776 checked when it was read, to ensure it isn't too big. */
2778 if (host_number_string)
2779 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2780 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2781 string_base62_32((long int)(
2782 host_number * (1000000/id_resolution)
2783 + message_id_tv.tv_usec/id_resolution))
2784 + (6 - MESSAGE_ID_SUBTIME_LEN)
2787 /* Host number not set: final field is just the fractional time at an
2788 appropriate resolution. */
2791 sprintf(CS(message_id + MESSAGE_ID_TIME_LEN + 1 + MESSAGE_ID_PID_LEN),
2792 "-%" str(MESSAGE_ID_SUBTIME_LEN) "s",
2793 string_base62_32((long int)(message_id_tv.tv_usec/id_resolution))
2794 + (6 - MESSAGE_ID_SUBTIME_LEN));
2796 /* Add the current message id onto the current process info string if
2799 (void)string_format(process_info + process_info_len,
2800 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2802 /* If we are using multiple input directories, set up the one for this message
2803 to be the least significant base-62 digit of the time of arrival. Otherwise
2804 ensure that it is an empty string. */
2806 set_subdir_str(message_subdir, message_id, 0);
2808 /* Now that we have the message-id, if there is no message-id: header, generate
2809 one, but only for local (without suppress_local_fixups) or submission mode
2810 messages. This can be user-configured if required, but we had better flatten
2811 any illegal characters therein. */
2814 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2816 uschar *id_text = US"";
2817 uschar *id_domain = primary_hostname;
2820 /* Permit only letters, digits, dots, and hyphens in the domain */
2822 if (message_id_domain)
2824 uschar *new_id_domain = expand_string(message_id_domain);
2827 if (!f.expand_string_forcedfail)
2828 log_write(0, LOG_MAIN|LOG_PANIC,
2829 "expansion of \"%s\" (message_id_header_domain) "
2830 "failed: %s", message_id_domain, expand_string_message);
2832 else if (*new_id_domain)
2834 id_domain = new_id_domain;
2835 for (uschar * p = id_domain; *p; p++)
2836 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2840 /* Permit all characters except controls and RFC 2822 specials in the
2841 additional text part. */
2843 if (message_id_text)
2845 uschar *new_id_text = expand_string(message_id_text);
2848 if (!f.expand_string_forcedfail)
2849 log_write(0, LOG_MAIN|LOG_PANIC,
2850 "expansion of \"%s\" (message_id_header_text) "
2851 "failed: %s", message_id_text, expand_string_message);
2853 else if (*new_id_text)
2855 id_text = new_id_text;
2856 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2860 /* Add the header line.
2861 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2862 appended, to preserve classical expectations of header ordering. */
2864 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2865 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2866 *id_text == 0 ? "" : ".", id_text, id_domain);
2868 /* Arrange for newly-created Message-Id to be logged */
2872 msgid_header_newly_created = TRUE;
2877 /* If we are to log recipients, keep a copy of the raw ones before any possible
2878 rewriting. Must copy the count, because later ACLs and the local_scan()
2879 function may mess with the real recipients. */
2881 if (LOGGING(received_recipients))
2883 raw_recipients = store_get(recipients_count * sizeof(uschar *), GET_UNTAINTED);
2884 for (int i = 0; i < recipients_count; i++)
2885 raw_recipients[i] = string_copy(recipients_list[i].address);
2886 raw_recipients_count = recipients_count;
2889 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2890 recipients will get here only if the conditions were right (allow_unqualified_
2891 recipient is TRUE). */
2894 { debug_printf_indent("qualify & rewrite recipients list\n"); acl_level++; }
2895 for (int i = 0; i < recipients_count; i++)
2896 recipients_list[i].address = /* deconst ok as src was not cont */
2897 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2898 global_rewrite_rules, rewrite_existflags);
2899 DEBUG(D_rewrite) acl_level--;
2901 /* If there is no From: header, generate one for local (without
2902 suppress_local_fixups) or submission_mode messages. If there is no sender
2903 address, but the sender is local or this is a local delivery error, use the
2904 originator login. This shouldn't happen for genuine bounces, but might happen
2905 for autoreplies. The addition of From: must be done *before* checking for the
2906 possible addition of a Sender: header, because untrusted_set_sender allows an
2907 untrusted user to set anything in the envelope (which might then get info
2908 From:) but we still want to ensure a valid Sender: if it is required. */
2911 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2913 const uschar * oname = US"";
2915 /* Use the originator_name if this is a locally submitted message and the
2916 caller is not trusted. For trusted callers, use it only if -F was used to
2917 force its value or if we have a non-SMTP message for which -f was not used
2918 to set the sender. */
2920 if (!sender_host_address)
2922 if (!f.trusted_caller || f.sender_name_forced ||
2923 (!smtp_input && !f.sender_address_forced))
2924 oname = originator_name;
2927 /* For non-locally submitted messages, the only time we use the originator
2928 name is when it was forced by the /name= option on control=submission. */
2930 else if (submission_name) oname = submission_name;
2932 /* Envelope sender is empty */
2934 if (!*sender_address)
2936 uschar *fromstart, *fromend;
2938 fromstart = string_sprintf("%sFrom: %s%s",
2939 resent_prefix, oname, *oname ? " <" : "");
2940 fromend = *oname ? US">" : US"";
2942 if (f.sender_local || f.local_error_message)
2943 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2944 local_part_quote(originator_login), qualify_domain_sender,
2947 else if (f.submission_mode && authenticated_id)
2949 if (!submission_domain)
2950 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2951 local_part_quote(authenticated_id), qualify_domain_sender,
2954 else if (!*submission_domain) /* empty => whole address set */
2955 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2959 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2960 local_part_quote(authenticated_id), submission_domain, fromend);
2962 from_header = header_last; /* To get it checked for Sender: */
2966 /* There is a non-null envelope sender. Build the header using the original
2967 sender address, before any rewriting that might have been done while
2972 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2975 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2978 from_header = header_last; /* To get it checked for Sender: */
2983 /* If the sender is local (without suppress_local_fixups), or if we are in
2984 submission mode and there is an authenticated_id, check that an existing From:
2985 is correct, and if not, generate a Sender: header, unless disabled. Any
2986 previously-existing Sender: header was removed above. Note that sender_local,
2987 as well as being TRUE if the caller of exim is not trusted, is also true if a
2988 trusted caller did not supply a -f argument for non-smtp input. To allow
2989 trusted callers to forge From: without supplying -f, we have to test explicitly
2990 here. If the From: header contains more than one address, then the call to
2991 parse_extract_address fails, and a Sender: header is inserted, as required. */
2994 && ( f.active_local_from_check
2995 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2996 || f.submission_mode && authenticated_id
2999 BOOL make_sender = TRUE;
3000 int start, end, domain;
3002 uschar *from_address =
3003 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
3004 &start, &end, &domain, FALSE);
3005 uschar *generated_sender_address;
3007 generated_sender_address = f.submission_mode
3008 ? !submission_domain
3009 ? string_sprintf("%s@%s",
3010 local_part_quote(authenticated_id), qualify_domain_sender)
3011 : !*submission_domain /* empty => full address */
3012 ? string_sprintf("%s", authenticated_id)
3013 : string_sprintf("%s@%s",
3014 local_part_quote(authenticated_id), submission_domain)
3015 : string_sprintf("%s@%s",
3016 local_part_quote(originator_login), qualify_domain_sender);
3018 /* Remove permitted prefixes and suffixes from the local part of the From:
3019 address before doing the comparison with the generated sender. */
3024 uschar *at = domain ? from_address + domain - 1 : NULL;
3027 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
3028 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
3030 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
3031 from_address += slen;
3035 if ( strcmpic(generated_sender_address, from_address) == 0
3036 || (!domain && strcmpic(from_address, originator_login) == 0))
3037 make_sender = FALSE;
3040 /* We have to cause the Sender header to be rewritten if there are
3041 appropriate rewriting rules. */
3044 if (f.submission_mode && !submission_name)
3045 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
3046 generated_sender_address);
3048 header_add(htype_sender, "%sSender: %s <%s>\n",
3050 f.submission_mode ? submission_name : originator_name,
3051 generated_sender_address);
3053 /* Ensure that a non-null envelope sender address corresponds to the
3054 submission mode sender address. */
3056 if (f.submission_mode && *sender_address)
3058 if (!sender_address_unrewritten)
3059 sender_address_unrewritten = sender_address;
3060 sender_address = generated_sender_address;
3061 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
3062 log_write(L_address_rewrite, LOG_MAIN,
3063 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
3064 sender_address_unrewritten, generated_sender_address);
3068 /* If there are any rewriting rules, apply them to the sender address, unless
3069 it has already been rewritten as part of verification for SMTP input. */
3072 { debug_printf("global rewrite rules\n"); acl_level++; }
3073 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
3075 /* deconst ok as src was not const */
3076 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
3077 global_rewrite_rules, rewrite_existflags);
3078 DEBUG(D_receive|D_rewrite)
3079 debug_printf("rewritten sender = %s\n", sender_address);
3081 DEBUG(D_rewrite) acl_level--;
3084 /* The headers must be run through rewrite_header(), because it ensures that
3085 addresses are fully qualified, as well as applying any rewriting rules that may
3088 Qualification of header addresses in a message from a remote host happens only
3089 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
3090 appropriate. For local messages, qualification always happens, unless -bnq is
3091 used to explicitly suppress it. No rewriting is done for an unqualified address
3092 that is left untouched.
3094 We start at the second header, skipping our own Received:. This rewriting is
3095 documented as happening *after* recipient addresses are taken from the headers
3096 by the -t command line option. An added Sender: gets rewritten here. */
3099 { debug_printf("rewrite headers\n"); acl_level++; }
3100 for (header_line * h = header_list->next, * newh; h; h = h->next)
3101 if ((newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3102 rewrite_existflags, TRUE)))
3104 DEBUG(D_rewrite) acl_level--;
3107 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3108 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3109 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3110 exists, this applies to the set of resent- headers rather than the normal set.
3112 The requirement for a recipient header has been removed in RFC 2822. At this
3113 point in the code, earlier versions of Exim added a To: header for locally
3114 submitted messages, and an empty Bcc: header for others. In the light of the
3115 changes in RFC 2822, this was dropped in November 2003. */
3118 /* If there is no date header, generate one if the message originates locally
3119 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3120 submission mode flag is set. Messages without Date: are not valid, but it seems
3121 to be more confusing if Exim adds one to all remotely-originated messages.
3122 As per Message-Id, we prepend if resending, else append.
3125 if ( !date_header_exists
3126 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3127 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3128 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3130 search_tidyup(); /* Free any cached resources */
3132 /* Show the complete set of headers if debugging. Note that the first one (the
3133 new Received:) has not yet been set. */
3137 debug_printf(">>Headers after rewriting and local additions:\n");
3138 for (header_line * h = header_list->next; h; h = h->next)
3139 debug_printf("%c %s", h->type, h->text);
3143 /* The headers are now complete in store. If we are running in filter
3144 testing mode, that is all this function does. Return TRUE if the message
3145 ended with a dot. */
3147 if (filter_test != FTEST_NONE)
3149 process_info[process_info_len] = 0;
3150 return message_ended == END_DOT;
3153 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3154 think more if it could be handled. Cannot do onward CHUNKING unless
3155 inbound is, but inbound chunking ought to be ok with outbound plain.
3156 Could we do onward CHUNKING given inbound CHUNKING?
3158 if (chunking_state > CHUNKING_OFFERED)
3159 cancel_cutthrough_connection(FALSE, US"chunking active");
3161 /* Cutthrough delivery:
3162 We have to create the Received header now rather than at the end of reception,
3163 so the timestamp behaviour is a change to the normal case.
3164 Having created it, send the headers to the destination. */
3166 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3168 if (received_count > received_headers_max)
3170 cancel_cutthrough_connection(TRUE, US"too many headers");
3171 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3172 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3173 "Too many \"Received\" headers",
3175 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3176 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3177 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3178 goto NOT_ACCEPTED; /* Skip to end of function */
3180 received_header_gen();
3181 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3182 (void) cutthrough_headers_send();
3186 /* Open a new spool file for the data portion of the message. We need
3187 to access it both via a file descriptor and a stdio stream. Try to make the
3188 directory if it isn't there. */
3190 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3191 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3193 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3195 if (errno == ENOENT)
3197 (void) directory_make(spool_directory,
3198 spool_sname(US"input", message_subdir),
3199 INPUT_DIRECTORY_MODE, TRUE);
3200 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3203 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3204 spool_name, strerror(errno));
3207 /* Make sure the file's group is the Exim gid, and double-check the mode
3208 because the group setting doesn't always get set automatically. */
3210 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3211 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3212 "Failed setting ownership on spool file %s: %s",
3213 spool_name, strerror(errno));
3214 (void)fchmod(data_fd, SPOOL_MODE);
3216 /* We now have data file open. Build a stream for it and lock it. We lock only
3217 the first line of the file (containing the message ID) because otherwise there
3218 are problems when Exim is run under Cygwin (I'm told). See comments in
3219 spool_in.c, where the same locking is done. */
3221 spool_data_file = fdopen(data_fd, "w+");
3222 lock_data.l_type = F_WRLCK;
3223 lock_data.l_whence = SEEK_SET;
3224 lock_data.l_start = 0;
3225 lock_data.l_len = spool_data_start_offset(message_id);
3227 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3228 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3229 errno, strerror(errno));
3231 /* We have an open, locked data file. Write the message id to it to make it
3232 self-identifying. Then read the remainder of the input of this message and
3233 write it to the data file. If the variable next != NULL, it contains the first
3234 data line (which was read as a header but then turned out not to have the right
3235 format); write it (remembering that it might contain binary zeros). The result
3236 of fwrite() isn't inspected; instead we call ferror() below. */
3238 fprintf(spool_data_file, "%s-D\n", message_id);
3241 uschar *s = next->text;
3242 int len = next->slen;
3243 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3244 body_linecount++; /* Assumes only 1 line */
3247 /* Note that we might already be at end of file, or the logical end of file
3248 (indicated by '.'), or might have encountered an error while writing the
3249 message id or "next" line. */
3251 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3255 message_ended = chunking_state <= CHUNKING_OFFERED
3256 ? read_message_data_smtp(spool_data_file, first_line_ended_crlf)
3258 ? read_message_bdat_smtp_wire(spool_data_file)
3259 : read_message_bdat_smtp(spool_data_file);
3260 receive_linecount++; /* The terminating "." line */
3263 message_ended = read_message_data(spool_data_file);
3265 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3266 message_linecount += body_linecount;
3268 switch (message_ended)
3270 /* Handle premature termination of SMTP */
3275 Uunlink(spool_name); /* Lose data file when closed */
3276 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3277 smtp_reply = handle_lost_connection(US"");
3279 goto NOT_ACCEPTED; /* Skip to end of function */
3283 /* Handle message that is too big. Don't use host_or_ident() in the log
3284 message; we want to see the ident value even for non-remote messages. */
3287 Uunlink(spool_name); /* Lose the data file when closed */
3288 cancel_cutthrough_connection(TRUE, US"mail too big");
3289 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3291 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3292 "message too big: read=%d max=%d",
3294 sender_fullhost ? " H=" : "",
3295 sender_fullhost ? sender_fullhost : US"",
3296 sender_ident ? " U=" : "",
3297 sender_ident ? sender_ident : US"",
3299 thismessage_size_limit);
3303 smtp_reply = US"552 Message size exceeds maximum permitted";
3304 goto NOT_ACCEPTED; /* Skip to end of function */
3308 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3309 give_local_error(ERRMESS_TOOBIG,
3310 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3311 US"message rejected: ", error_rc, spool_data_file, header_list);
3312 /* Does not return */
3316 /* Handle bad BDAT protocol sequence */
3319 Uunlink(spool_name); /* Lose the data file when closed */
3320 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3321 smtp_reply = US""; /* Response already sent */
3322 goto NOT_ACCEPTED; /* Skip to end of function */
3326 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3327 example, there may be some expansion in an ACL that uses a timer.) */
3329 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3331 /* The message body has now been read into the data file. Call fflush() to
3332 empty the buffers in C, and then call fsync() to get the data written out onto
3333 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3334 having to do this). If there was an I/O error on either input or output,
3335 attempt to send an error message, and unlink the spool file. For non-SMTP input
3336 we can then give up. Note that for SMTP input we must swallow the remainder of
3337 the input in cases of output errors, since the far end doesn't expect to see
3338 anything until the terminating dot line is sent. */
3340 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3341 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3343 uschar *msg_errno = US strerror(errno);
3344 BOOL input_error = (receive_ferror)() != 0;
3345 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3346 input_error? "Input read" : "Spool write",
3348 sender_fullhost ? sender_fullhost : sender_ident);
3350 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3351 Uunlink(spool_name); /* Lose the data file */
3352 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3357 smtp_reply = US"451 Error while reading input data";
3360 smtp_reply = US"451 Error while writing spool file";
3361 receive_swallow_smtp();
3363 goto NOT_ACCEPTED; /* Skip to end of function */
3368 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3369 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3371 /* Does not return */
3376 /* No I/O errors were encountered while writing the data file. */
3378 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3379 gettimeofday(&received_time_complete, NULL);
3382 /* If there were any bad addresses extracted by -t, or there were no recipients
3383 left after -t, send a message to the sender of this message, or write it to
3384 stderr if the error handling option is set that way. Note that there may
3385 legitimately be no recipients for an SMTP message if they have all been removed
3388 We need to rewind the data file in order to read it. In the case of no
3389 recipients or stderr error writing, throw the data file away afterwards, and
3390 exit. (This can't be SMTP, which always ensures there's at least one
3391 syntactically good recipient address.) */
3393 if (extract_recip && (bad_addresses || recipients_count == 0))
3397 if (recipients_count == 0) debug_printf("*** No recipients\n");
3400 debug_printf("*** Bad address(es)\n");
3401 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3402 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3406 log_write(0, LOG_MAIN|LOG_PANIC, "%s found in headers",
3407 bad_addresses ? "bad addresses" : "no recipients");
3409 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3411 /* If configured to send errors to the sender, but this fails, force
3412 a failure error code. We use a special one for no recipients so that it
3413 can be detected by the autoreply transport. Otherwise error_rc is set to
3414 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3415 it is EXIT_SUCCESS. */
3417 if (error_handling == ERRORS_SENDER)
3419 if (!moan_to_sender(
3421 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3422 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3423 bad_addresses, header_list, spool_data_file, FALSE
3425 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3430 if (extracted_ignored)
3431 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3433 fprintf(stderr, "exim: no recipients in message\n");
3436 fprintf(stderr, "exim: invalid address%s",
3437 bad_addresses->next ? "es:\n" : ":");
3438 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3439 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3440 bad_addresses->text2);
3444 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3446 Uunlink(spool_name);
3447 (void)fclose(spool_data_file);
3448 exim_exit(error_rc);
3452 /* Data file successfully written. Generate text for the Received: header by
3453 expanding the configured string, and adding a timestamp. By leaving this
3454 operation till now, we ensure that the timestamp is the time that message
3455 reception was completed. However, this is deliberately done before calling the
3456 data ACL and local_scan().
3458 This Received: header may therefore be inspected by the data ACL and by code in
3459 the local_scan() function. When they have run, we update the timestamp to be
3460 the final time of reception.
3462 If there is just one recipient, set up its value in the $received_for variable
3463 for use when we generate the Received: header.
3465 Note: the checking for too many Received: headers is handled by the delivery
3467 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3469 if (!received_header->text) /* Non-cutthrough case */
3471 received_header_gen();
3473 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3475 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3476 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3478 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3479 now, before running the DATA ACL. */
3481 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3484 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3485 statbuf.st_size - spool_data_start_offset(message_id) : -1;
3487 /* If an ACL is specified for checking things at this stage of reception of a
3488 message, run it, unless all the recipients were removed by "discard" in earlier
3489 ACLs. That is the only case in which recipients_count can be zero at this
3490 stage. Set deliver_datafile to point to the data file so that $message_body and
3491 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3494 deliver_datafile = data_fd;
3497 f.enable_dollar_recipients = TRUE;
3499 if (recipients_count == 0)
3500 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3504 /* Handle interactive SMTP messages */
3506 if (smtp_input && !smtp_batched_input)
3509 #ifndef DISABLE_DKIM
3510 if (!f.dkim_disable_verify)
3512 /* Finish verification */
3513 dkim_exim_verify_finish();
3515 /* Check if we must run the DKIM ACL */
3516 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3518 uschar * dkim_verify_signers_expanded =
3519 expand_string(dkim_verify_signers);
3520 gstring * results = NULL;
3524 gstring * seen_items = NULL;
3525 int old_pool = store_pool;
3527 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3529 if (!(ptr = dkim_verify_signers_expanded))
3530 log_write(0, LOG_MAIN|LOG_PANIC,
3531 "expansion of dkim_verify_signers option failed: %s",
3532 expand_string_message);
3534 /* Default to OK when no items are present */
3536 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3538 /* Prevent running ACL for an empty item */
3539 if (!item || !*item) continue;
3541 /* Only run ACL once for each domain or identity,
3542 no matter how often it appears in the expanded list. */
3546 const uschar * seen_items_list = string_from_gstring(seen_items);
3548 BOOL seen_this_item = FALSE;
3550 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3552 if (Ustrcmp(seen_item,item) == 0)
3554 seen_this_item = TRUE;
3561 debug_printf("acl_smtp_dkim: skipping signer %s, "
3562 "already seen\n", item);
3566 seen_items = string_catn(seen_items, US":", 1);
3568 seen_items = string_cat(seen_items, item);
3570 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3574 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3575 "skipping remaining items\n", rc, item);
3576 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3580 dkim_verify_status = string_from_gstring(results);
3581 store_pool = old_pool;
3582 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3585 recipients_count = 0;
3586 blackholed_by = US"DKIM ACL";
3588 blackhole_log_msg = string_sprintf(": %s", log_msg);
3592 Uunlink(spool_name);
3593 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3594 smtp_yield = FALSE; /* No more messages after dropped connection */
3595 smtp_reply = US""; /* Indicate reply already sent */
3596 goto NOT_ACCEPTED; /* Skip to end of function */
3600 dkim_exim_verify_log_all();
3602 #endif /* DISABLE_DKIM */
3604 #ifdef WITH_CONTENT_SCAN
3605 if ( recipients_count > 0
3607 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3610 #endif /* WITH_CONTENT_SCAN */
3612 #ifdef SUPPORT_DMARC
3613 dmarc_store_data(from_header);
3616 #ifndef DISABLE_PRDR
3617 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3620 int all_fail = FAIL;
3622 smtp_printf("353 PRDR content analysis beginning\r\n", SP_MORE);
3623 /* Loop through recipients, responses must be in same order received */
3624 for (unsigned int c = 0; recipients_count > c; c++)
3626 const uschar * addr = recipients_list[c].address;
3627 uschar * msg= US"PRDR R=<%s> %s";
3630 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3631 addr, c+1, recipients_count);
3632 rc = acl_check(ACL_WHERE_PRDR, addr,
3633 acl_smtp_data_prdr, &user_msg, &log_msg);
3635 /* If any recipient rejected content, indicate it in final message */
3637 /* If all recipients rejected, indicate in final message */
3642 case OK: case DISCARD: code = US"250"; break;
3643 case DEFER: code = US"450"; break;
3644 default: code = US"550"; break;
3646 if (user_msg != NULL)
3647 smtp_user_msg(code, user_msg);
3652 case OK: case DISCARD:
3653 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3655 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3657 msg = string_sprintf(CS msg, addr, "refusal"); break;
3659 smtp_user_msg(code, msg);
3661 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3662 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3663 else log_write(0, LOG_MAIN, "%s", CS msg);
3665 if (rc != OK) { receive_remove_recipient(addr); c--; }
3667 /* Set up final message, used if data acl gives OK */
3668 smtp_reply = string_sprintf("%s id=%s message %s",
3669 all_fail == FAIL ? US"550" : US"250",
3672 ? US"rejected for all recipients"
3675 : US"accepted for some recipients");
3676 if (recipients_count == 0)
3680 prdr_requested = FALSE;
3681 #endif /* !DISABLE_PRDR */
3683 /* Check the recipients count again, as the MIME ACL might have changed
3686 if (acl_smtp_data && recipients_count > 0)
3688 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3689 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3692 recipients_count = 0;
3693 blackholed_by = US"DATA ACL";
3695 blackhole_log_msg = string_sprintf(": %s", log_msg);
3696 cancel_cutthrough_connection(TRUE, US"data acl discard");
3700 Uunlink(spool_name);
3701 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3702 #ifdef WITH_CONTENT_SCAN
3705 #ifdef EXPERIMENTAL_DCC
3708 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3709 smtp_yield = FALSE; /* No more messages after dropped connection */
3710 smtp_reply = US""; /* Indicate reply already sent */
3711 goto NOT_ACCEPTED; /* Skip to end of function */
3716 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3717 we cannot take different actions for permanent and temporary rejections. */
3722 #ifdef WITH_CONTENT_SCAN
3723 if ( acl_not_smtp_mime
3724 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3728 #endif /* WITH_CONTENT_SCAN */
3732 uschar *user_msg, *log_msg;
3733 f.authentication_local = TRUE;
3734 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3737 recipients_count = 0;
3738 blackholed_by = US"non-SMTP ACL";
3740 blackhole_log_msg = string_sprintf(": %s", log_msg);
3744 Uunlink(spool_name);
3745 #ifdef WITH_CONTENT_SCAN
3748 #ifdef EXPERIMENTAL_DCC
3751 /* The ACL can specify where rejections are to be logged, possibly
3752 nowhere. The default is main and reject logs. */
3754 if (log_reject_target)
3755 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3756 sender_address, log_msg);
3758 if (!user_msg) user_msg = US"local configuration problem";
3759 if (smtp_batched_input)
3760 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3761 /* Does not return */
3764 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3765 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3766 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3768 /* Does not return */
3771 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3775 /* The applicable ACLs have been run */
3777 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3778 if (f.queue_only_policy) queued_by = US"ACL";
3781 #ifdef WITH_CONTENT_SCAN
3785 #ifdef EXPERIMENTAL_DCC
3790 #ifdef HAVE_LOCAL_SCAN
3791 /* The final check on the message is to run the scan_local() function. The
3792 version supplied with Exim always accepts, but this is a hook for sysadmins to
3793 supply their own checking code. The local_scan() function is run even when all
3794 the recipients have been discarded. */
3796 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
3798 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3799 deleted, and the incident gets logged. */
3801 if (sigsetjmp(local_scan_env, 1) == 0)
3803 had_local_scan_crash = 0;
3804 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3805 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3806 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3807 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3809 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3810 local_scan_timeout);
3811 local_scan_data = NULL;
3813 had_local_scan_timeout = 0;
3814 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3815 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3816 rc = local_scan(data_fd, &local_scan_data);
3818 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3820 f.enable_dollar_recipients = FALSE;
3822 store_pool = POOL_MAIN; /* In case changed */
3823 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3826 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3827 os_non_restarting_signal(SIGFPE, SIG_DFL);
3828 os_non_restarting_signal(SIGILL, SIG_DFL);
3829 os_non_restarting_signal(SIGBUS, SIG_DFL);
3833 if (had_local_scan_crash)
3835 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3836 "signal %d - message temporarily rejected (size %d)",
3837 had_local_scan_crash, message_size);
3838 receive_bomb_out(US"local-scan-error", US"local verification problem");
3839 /* Does not return */
3841 if (had_local_scan_timeout)
3843 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3844 "message temporarily rejected (size %d)", message_size);
3845 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3846 /* Does not return */
3850 /* The length check is paranoia against some runaway code, and also because
3851 (for a success return) lines in the spool file are read into big_buffer. */
3853 if (local_scan_data)
3855 int len = Ustrlen(local_scan_data);
3856 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3857 local_scan_data = string_copyn(local_scan_data, len);
3860 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3862 if (!f.deliver_freeze) /* ACL might have already frozen */
3864 f.deliver_freeze = TRUE;
3865 deliver_frozen_at = time(NULL);
3866 frozen_by = US"local_scan()";
3868 rc = LOCAL_SCAN_ACCEPT;
3870 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3872 if (!f.queue_only_policy) /* ACL might have already queued */
3874 f.queue_only_policy = TRUE;
3875 queued_by = US"local_scan()";
3877 rc = LOCAL_SCAN_ACCEPT;
3880 /* Message accepted: remove newlines in local_scan_data because otherwise
3881 the spool file gets corrupted. Ensure that all recipients are qualified. */
3883 if (rc == LOCAL_SCAN_ACCEPT)
3885 if (local_scan_data)
3886 for (uschar * s = local_scan_data; *s; s++) if (*s == '\n') *s = ' ';
3887 for (recipient_item * r = recipients_list;
3888 r < recipients_list + recipients_count; r++)
3890 r->address = rewrite_address_qualify(r->address, TRUE);
3892 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3894 if (recipients_count == 0 && !blackholed_by)
3895 blackholed_by = US"local_scan";
3898 /* Message rejected: newlines permitted in local_scan_data to generate
3899 multiline SMTP responses. */
3903 uschar *istemp = US"";
3907 errmsg = local_scan_data;
3909 Uunlink(spool_name); /* Cancel this message */
3913 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3914 "rejection given", rc);
3917 case LOCAL_SCAN_REJECT_NOLOGHDR:
3918 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3921 case LOCAL_SCAN_REJECT:
3922 smtp_code = US"550";
3923 if (!errmsg) errmsg = US"Administrative prohibition";
3926 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3927 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3930 case LOCAL_SCAN_TEMPREJECT:
3932 smtp_code = US"451";
3933 if (!errmsg) errmsg = US"Temporary local problem";
3934 istemp = US"temporarily ";
3938 g = string_append(NULL, 2, US"F=", *sender_address ? sender_address : US"<>");
3939 g = add_host_info_for_log(g);
3941 log_write(0, LOG_MAIN|LOG_REJECT, "%Y %srejected by local_scan(): %.256s",
3942 g, istemp, string_printing(errmsg));
3945 if (!smtp_batched_input)
3947 smtp_respond(smtp_code, 3, SR_FINAL, errmsg);
3948 smtp_reply = US""; /* Indicate reply already sent */
3949 goto NOT_ACCEPTED; /* Skip to end of function */
3952 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3953 /* Does not return */
3956 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
3957 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3958 US"message rejected by local scan code: ", error_rc, spool_data_file,
3960 /* Does not return */
3964 /* Reset signal handlers to ignore signals that previously would have caused
3965 the message to be abandoned. */
3967 signal(SIGTERM, SIG_IGN);
3968 signal(SIGINT, SIG_IGN);
3969 #endif /* HAVE_LOCAL_SCAN */
3971 /* If we are faking a reject or defer, avoid sennding a DSN for the
3972 actually-accepted message */
3974 if (fake_response != OK)
3975 for (recipient_item * r = recipients_list;
3976 r < recipients_list + recipients_count; r++)
3978 DEBUG(D_receive) if (r->dsn_flags & (rf_notify_success | rf_notify_delay))
3979 debug_printf("DSN: clearing flags due to fake-response for message\n");
3980 r->dsn_flags = r->dsn_flags & ~(rf_notify_success | rf_notify_delay)
3985 /* Ensure the first time flag is set in the newly-received message. */
3987 f.deliver_firsttime = TRUE;
3989 #ifdef EXPERIMENTAL_BRIGHTMAIL
3991 { /* rewind data file */
3992 lseek(data_fd, (long int)spool_data_start_offset(message_id), SEEK_SET);
3993 bmi_verdicts = bmi_process_message(header_list, data_fd);
3997 /* Update the timestamp in our Received: header to account for any time taken by
3998 an ACL or by local_scan(). The new time is the time that all reception
3999 processing is complete. */
4001 timestamp = expand_string(US"${tod_full}");
4002 tslen = Ustrlen(timestamp);
4004 memcpy(received_header->text + received_header->slen - tslen - 1,
4007 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
4011 f.deliver_freeze = FALSE;
4012 f.queue_only_policy = FALSE;
4015 /* Keep the data file open until we have written the header file, in order to
4016 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
4017 don't write the header file, and we unlink the data file. If writing the header
4018 file fails, we have failed to accept this message. */
4020 if (host_checking || blackholed_by)
4022 Uunlink(spool_name);
4023 msg_size = 0; /* Compute size for log line */
4024 for (header_line * h = header_list; h; h = h->next)
4025 if (h->type != '*') msg_size += h->slen;
4028 /* Write the -H file */
4031 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
4033 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
4034 Uunlink(spool_name); /* Lose the data file */
4038 smtp_reply = US"451 Error in writing spool file";
4043 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4044 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4046 /* Does not return */
4051 /* The message has now been successfully received. */
4053 receive_messagecount++;
4055 if (fflush(spool_data_file))
4057 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
4058 log_write(0, LOG_MAIN, "%s\n", errmsg);
4059 Uunlink(spool_name); /* Lose the data file */
4063 smtp_reply = US"451 Error in writing spool file";
4068 fseek(spool_data_file, (long int)spool_data_start_offset(message_id), SEEK_SET);
4069 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4071 /* Does not return */
4075 /* Add data size to written header size. We do not count the initial file name
4076 that is in the file, but we do add one extra for the notional blank line that
4077 precedes the data. This total differs from message_size in that it include the
4078 added Received: header and any other headers that got created locally. */
4080 fstat(data_fd, &statbuf);
4081 msg_size += statbuf.st_size - spool_data_start_offset(message_id) + 1;
4083 /* Generate a "message received" log entry. We do this by building up a dynamic
4084 string as required. We log the arrival of a new message while the
4085 file is still locked, just in case the machine is *really* fast, and delivers
4086 it first! Include any message id that is in the message - since the syntax of a
4087 message id is actually an addr-spec, we can use the parse routine to canonicalize
4090 rcvd_log_reset_point = store_mark();
4091 g = string_get(256);
4093 g = string_append(g, 2,
4094 fake_response == FAIL ? US"(= " : US"<= ",
4095 *sender_address ? sender_address : US"<>");
4096 if (message_reference)
4097 g = string_append(g, 2, US" R=", message_reference);
4099 g = add_host_info_for_log(g);
4102 if (LOGGING(tls_cipher) && tls_in.cipher)
4104 g = string_append(g, 2, US" X=", tls_in.cipher);
4105 # ifndef DISABLE_TLS_RESUME
4106 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4107 g = string_catn(g, US"*", 1);
4110 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4111 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4112 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4113 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4114 if (LOGGING(tls_sni) && tls_in.sni)
4115 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4118 if (sender_host_authenticated)
4120 g = string_append(g, 2, US" A=", sender_host_authenticated);
4121 if (authenticated_id)
4123 g = string_append(g, 2, US":", authenticated_id);
4124 if (LOGGING(smtp_mailauth) && authenticated_sender)
4125 g = string_append(g, 2, US":", authenticated_sender);
4129 #ifndef DISABLE_PRDR
4131 g = string_catn(g, US" PRDR", 5);
4134 #ifdef SUPPORT_PROXY
4135 if (proxy_session && LOGGING(proxy))
4136 g = string_append(g, 2, US" PRX=", proxy_local_address);
4139 if (chunking_state > CHUNKING_OFFERED)
4140 g = string_catn(g, US" K", 2);
4142 g = string_fmt_append(g, " S=%d", msg_size);
4144 /* log 8BITMIME mode announced in MAIL_FROM
4148 if (LOGGING(8bitmime))
4149 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4151 #ifndef DISABLE_DKIM
4152 if (LOGGING(dkim) && dkim_verify_overall)
4153 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4154 # ifdef EXPERIMENTAL_ARC
4155 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4156 g = string_catn(g, US" ARC", 4);
4160 if (LOGGING(receive_time))
4162 struct timeval diff = received_time_complete;
4163 timediff(&diff, &received_time);
4164 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4168 g = string_append(g, 2, US" Q=", queue_name);
4170 /* If an addr-spec in a message-id contains a quoted string, it can contain
4171 any characters except " \ and CR and so in particular it can contain NL!
4172 Therefore, make sure we use a printing-characters only version for the log.
4173 Also, allow for domain literals in the message id. */
4175 if ( LOGGING(msg_id) && msgid_header
4176 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4180 BOOL save_allow_domain_literals = allow_domain_literals;
4181 allow_domain_literals = TRUE;
4182 int start, end, domain;
4184 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4185 &errmsg, &start, &end, &domain, FALSE);
4186 allow_domain_literals = save_allow_domain_literals;
4188 g = string_append(g, 2,
4189 msgid_header_newly_created ? US" id*=" : US" id=",
4190 string_printing(old_id));
4193 /* If subject logging is turned on, create suitable printing-character
4194 text. By expanding $h_subject: we make use of the MIME decoding. */
4196 if (LOGGING(subject) && subject_header)
4198 uschar *p = big_buffer;
4199 uschar *ss = expand_string(US"$h_subject:");
4201 /* Backslash-quote any double quotes or backslashes so as to make a
4202 a C-like string, and turn any non-printers into escape sequences. */
4205 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4207 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4212 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4215 /* Terminate the string: string_cat() and string_append() leave room, but do
4216 not put the zero in. */
4218 (void) string_from_gstring(g);
4220 /* Create a message log file if message logs are being used and this message is
4221 not blackholed. Write the reception stuff to it. We used to leave message log
4222 creation until the first delivery, but this has proved confusing for some
4225 if (message_logs && !blackholed_by)
4228 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4230 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4234 (void)directory_make(spool_directory,
4235 spool_sname(US"msglog", message_subdir),
4236 MSGLOG_DIRECTORY_MODE, TRUE);
4237 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4241 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4242 m_name, strerror(errno));
4245 FILE *message_log = fdopen(fd, "a");
4248 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4249 m_name, strerror(errno));
4254 uschar * now = tod_stamp(tod_log);
4255 /* Drop the initial "<= " */
4256 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4257 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4259 if (f.queue_only_policy) fprintf(message_log,
4260 "%s no immediate delivery: queued%s%s by %s\n", now,
4261 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4263 (void)fclose(message_log);
4268 /* Everything has now been done for a successful message except logging its
4269 arrival, and outputting an SMTP response. While writing to the log, set a flag
4270 to cause a call to receive_bomb_out() if the log cannot be opened. */
4272 f.receive_call_bombout = TRUE;
4274 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4275 connection has gone away. This can only be done if there is no unconsumed input
4276 waiting in the local input buffer. We can test for this by calling
4277 receive_hasc(). RFC 2920 (pipelining) explicitly allows for additional
4278 input to be sent following the final dot, so the presence of following input is
4281 If the connection is still present, but there is no unread input for the
4282 socket, the result of a select() call will be zero. If, however, the connection
4283 has gone away, or if there is pending input, the result of select() will be
4284 non-zero. The two cases can be distinguished by trying to read the next input
4285 character. If we succeed, we can unread it so that it remains in the local
4286 buffer for handling later. If not, the connection has been lost.
4288 Of course, since TCP/IP is asynchronous, there is always a chance that the
4289 connection will vanish between the time of this test and the sending of the
4290 response, but the chance of this happening should be small. */
4292 if ( smtp_input && sender_host_address && !f.sender_host_notsocket
4295 if (poll_one_fd(fileno(smtp_in), POLLIN, 0) != 0)
4297 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4298 if (c != EOF) (receive_ungetc)(c);
4301 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4302 smtp_reply = US""; /* No attempt to send a response */
4303 smtp_yield = FALSE; /* Nothing more on this connection */
4305 /* Re-use the log line workspace */
4308 g = string_cat(g, US"SMTP connection lost after final dot");
4309 g = add_host_info_for_log(g);
4310 log_write(0, LOG_MAIN, "%Y", g);
4312 /* Delete the files for this aborted message. */
4314 Uunlink(spool_name);
4315 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4316 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4323 /* The connection has not gone away; we really are going to take responsibility
4324 for this message. */
4326 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4329 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4330 the sender's dot (below).
4331 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4332 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4333 in which case pass temp-reject back to initiator and dump the files.
4335 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4337 XXX We do not handle queue-only, freezing, or blackholes.
4339 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4341 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4342 /* Logging was done in finaldot() */
4345 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4346 cutthrough_done = ACCEPTED;
4347 break; /* message_id needed for SMTP accept below */
4349 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4350 ... for which, pass back the exact error */
4351 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4352 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4353 break; /* message_id needed for SMTP accept below */
4355 default: /* Unknown response, or error. Treat as temp-reject. */
4356 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4357 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4358 break; /* message_id needed for SMTP accept below */
4360 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4361 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4362 cutthrough_done = PERM_REJ;
4367 #ifndef DISABLE_PRDR
4368 if(!smtp_reply || prdr_requested)
4373 log_write(0, LOG_MAIN |
4374 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4375 (LOGGING(received_sender) ? LOG_SENDER : 0),
4378 /* Log any control actions taken by an ACL or local_scan(). */
4380 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4381 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4382 "no immediate delivery: queued%s%s by %s",
4383 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4386 f.receive_call_bombout = FALSE;
4388 /* The store for the main log message can be reused */
4389 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4391 /* If the message is frozen, and freeze_tell is set, do the telling. */
4393 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4394 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4395 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4396 message_id, frozen_by, sender_address);
4399 /* Either a message has been successfully received and written to the two spool
4400 files, or an error in writing the spool has occurred for an SMTP message, or
4401 an SMTP message has been rejected for policy reasons, or a message was passed on
4402 by cutthrough delivery. (For a non-SMTP message we will have already given up
4403 because there's no point in carrying on!) For non-cutthrough we must now close
4404 (and thereby unlock) the data file. In the successful case, this leaves the
4405 message on the spool, ready for delivery. In the error case, the spool file will
4406 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4409 For cutthrough we hold the data file locked until we have deleted it, otherwise
4410 a queue-runner could grab it in the window.
4412 A fflush() was done earlier in the expectation that any write errors on the
4413 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4414 possible for fclose() to fail - and this has been seen on obscure filesystems
4415 (probably one that delayed the actual media write as long as possible)
4416 but what to do? What has happened to the lock if this happens?
4417 It's a mess because we already logged the acceptance.
4418 We can at least log the issue, try to remove spoolfiles and respond with
4419 a temp-reject. We do not want to close before logging acceptance because
4420 we want to hold the lock until we know that logging worked.
4421 Could we make this less likely by doing an fdatasync() just after the fflush()?
4422 That seems like a good thing on data-security grounds, but how much will it hit
4429 message_id[0] = 0; /* Indicate no message accepted */
4432 process_info[process_info_len] = 0; /* Remove message id */
4433 if (spool_data_file && cutthrough_done == NOT_TRIED)
4435 if (fclose(spool_data_file)) /* Frees the lock */
4437 log_msg = string_sprintf("spoolfile error on close: %s", strerror(errno));
4438 log_write(0, LOG_MAIN|LOG_PANIC |
4439 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4440 (LOGGING(received_sender) ? LOG_SENDER : 0),
4442 log_write(0, LOG_MAIN |
4443 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4444 (LOGGING(received_sender) ? LOG_SENDER : 0),
4445 "rescind the above message-accept");
4447 Uunlink(spool_name);
4448 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4449 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4451 /* Claim a data ACL temp-reject, just to get reject logging and response */
4452 if (smtp_input) smtp_handle_acl_fail(ACL_WHERE_DATA, rc, NULL, log_msg);
4453 smtp_reply = US""; /* Indicate reply already sent */
4455 message_id[0] = 0; /* no message accepted */
4457 spool_data_file = NULL;
4460 /* Now reset signal handlers to their defaults */
4462 signal(SIGTERM, SIG_DFL);
4463 signal(SIGINT, SIG_DFL);
4465 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4466 value, which defaults TRUE - meaning there may be more incoming messages from
4467 this connection. For non-SMTP callers (where there is only ever one message),
4468 the default is FALSE. */
4474 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4475 is set to the response that should be sent. When it is NULL, we generate
4476 default responses. After an ACL error or local_scan() error, the response has
4477 already been sent, and smtp_reply is an empty string to indicate this. */
4479 if (!smtp_batched_input)
4483 if (fake_response != OK)
4484 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4485 3, SR_FINAL, fake_response_text);
4487 /* An OK response is required; use "message" text if present. */
4491 uschar *code = US"250";
4493 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4494 smtp_respond(code, len, SR_FINAL, user_msg);
4497 /* Default OK response */
4499 else if (chunking_state > CHUNKING_OFFERED)
4501 /* If there is more input waiting, no need to flush (probably the client
4502 pipelined QUIT after data). We check only the in-process buffer, not
4505 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4507 chunking_datasize, message_size+message_linecount, message_id);
4508 chunking_state = CHUNKING_OFFERED;
4511 smtp_printf("250 OK id=%s\r\n", receive_hasc(), message_id);
4515 "\n**** SMTP testing: that is not a real message id!\n\n");
4518 /* smtp_reply is set non-empty */
4520 else if (smtp_reply[0] != 0)
4521 if (fake_response != OK && smtp_reply[0] == '2')
4522 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4523 3, SR_FINAL, fake_response_text);
4525 smtp_printf("%.1024s\r\n", SP_NO_MORE, smtp_reply);
4527 switch (cutthrough_done)
4530 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4532 /* Delete spool files */
4533 Uunlink(spool_name);
4534 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4535 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4539 if (cutthrough.defer_pass)
4541 Uunlink(spool_name);
4542 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4543 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4548 if (cutthrough_done != NOT_TRIED)
4550 if (spool_data_file)
4552 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4553 spool_data_file = NULL;
4555 message_id[0] = 0; /* Prevent a delivery from starting */
4556 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4557 cutthrough.defer_pass = FALSE;
4561 /* For batched SMTP, generate an error message on failure, and do
4562 nothing on success. The function moan_smtp_batch() does not return -
4563 it exits from the program with a non-zero return code. */
4565 else if (smtp_reply)
4566 moan_smtp_batch(NULL, "%s", smtp_reply);
4570 /* If blackholing, we can immediately log this message's sad fate. The data
4571 file has already been unlinked, and the header file was never written to disk.
4572 We must now indicate that nothing was received, to prevent a delivery from
4577 const uschar *detail =
4578 #ifdef HAVE_LOCAL_SCAN
4579 local_scan_data ? string_printing(local_scan_data) :
4581 string_sprintf("(%s discarded recipients)", blackholed_by);
4582 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4583 log_write(0, LOG_MAIN, "Completed");
4587 /* Reset headers so that logging of rejects for a subsequent message doesn't
4588 include them. It is also important to set header_last = NULL before exiting
4589 from this function, as this prevents certain rewrites that might happen during
4590 subsequent verifying (of another incoming message) from trying to add headers
4591 when they shouldn't. */
4593 header_list = header_last = NULL;
4595 return yield; /* TRUE if more messages (SMTP only) */
4598 /* End of receive.c */