1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* Copyright (c) The Exim Maintainers 2020 - 2021 */
7 /* See the file NOTICE for conditions of use and distribution. */
9 /* Code for receiving a message and setting up spool files. */
14 #ifdef EXPERIMENTAL_DCC
22 /*************************************************
23 * Local static variables *
24 *************************************************/
26 static int data_fd = -1;
27 static uschar *spool_name = US"";
29 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
31 #ifdef HAVE_LOCAL_SCAN
32 jmp_buf local_scan_env; /* error-handling context for local_scan */
33 unsigned had_local_scan_crash;
34 unsigned had_local_scan_timeout;
38 /*************************************************
39 * Non-SMTP character reading functions *
40 *************************************************/
42 /* These are the default functions that are set up in the variables such as
43 receive_getc initially. They just call the standard functions, passing stdin as
44 the file. (When SMTP input is occurring, different functions are used by
45 changing the pointer variables.) */
47 uschar stdin_buf[4096];
48 uschar * stdin_inptr = stdin_buf;
49 uschar * stdin_inend = stdin_buf;
54 size_t rc = fread(stdin_buf, 1, sizeof(stdin_buf), stdin);
59 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
60 log_write(L_lost_incoming_connection,
61 LOG_MAIN, "timed out while reading local message");
62 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
66 if (filter_test == FTEST_NONE)
68 fprintf(stderr, "\nexim: %s received - message abandoned\n",
69 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
70 log_write(0, LOG_MAIN, "%s received while reading local message",
71 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
73 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
77 stdin_inend = stdin_buf + rc;
78 stdin_inptr = stdin_buf;
83 stdin_getc(unsigned lim)
85 if (stdin_inptr >= stdin_inend)
88 return *stdin_inptr++;
95 return stdin_inptr < stdin_inend;
101 if (stdin_inptr <= stdin_buf)
102 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "buffer underflow in stdin_ungetc");
111 return stdin_hasc() ? FALSE : feof(stdin);
117 return ferror(stdin);
123 /*************************************************
124 * Check that a set sender is allowed *
125 *************************************************/
127 /* This function is called when a local caller sets an explicit sender address.
128 It checks whether this is permitted, which it is for trusted callers.
129 Otherwise, it must match the pattern(s) in untrusted_set_sender.
131 Arguments: the proposed sender address
132 Returns: TRUE for a trusted caller
133 TRUE if the address has been set, untrusted_set_sender has been
134 set, and the address matches something in the list
139 receive_check_set_sender(uschar *newsender)
142 if (f.trusted_caller) return TRUE;
143 if (!newsender || !untrusted_set_sender) return FALSE;
144 qnewsender = Ustrchr(newsender, '@')
145 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
146 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
152 /*************************************************
153 * Read space info for a partition *
154 *************************************************/
156 /* This function is called by receive_check_fs() below, and also by string
157 expansion for variables such as $spool_space. The field names for the statvfs
158 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
159 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
160 have inodes, and they return -1 for the number available.
162 Later: It turns out that some file systems that do not have the concept of
163 inodes return 0 rather than -1. Such systems should also return 0 for the total
164 number of inodes, so we require that to be greater than zero before returning
168 isspool TRUE for spool partition, FALSE for log partition
169 inodeptr address of int to receive inode count; -1 if there isn't one
171 Returns: available on-root space, in kilobytes
172 -1 for log partition if there isn't one
174 All values are -1 if the STATFS functions are not available.
178 receive_statvfs(BOOL isspool, int *inodeptr)
181 struct STATVFS statbuf;
187 /* The spool directory must always exist. */
191 path = spool_directory;
195 /* Need to cut down the log file path to the directory, and to ignore any
196 appearance of "syslog" in it. */
200 int sep = ':'; /* Not variable - outside scripts use */
201 const uschar *p = log_file_path;
204 /* An empty log_file_path means "use the default". This is the same as an
205 empty item in a list. */
207 if (*p == 0) p = US":";
208 /* should never be a tainted list */
209 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
210 if (Ustrcmp(path, "syslog") != 0)
213 if (path == NULL) /* No log files */
219 /* An empty string means use the default, which is in the spool directory.
220 But don't just use the spool directory, as it is possible that the log
221 subdirectory has been symbolically linked elsewhere. */
225 sprintf(CS buffer, CS"%s/log", CS spool_directory);
231 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
235 /* We now have the path; do the business */
237 memset(&statbuf, 0, sizeof(statbuf));
239 if (STATVFS(CS path, &statbuf) != 0)
240 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
241 { /* Can happen on first run after installation */
247 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
248 "%s directory %s: %s", name, path, strerror(errno));
249 smtp_closedown(US"spool or log directory problem");
250 exim_exit(EXIT_FAILURE);
253 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
255 /* Disks are getting huge. Take care with computing the size in kilobytes. */
257 return (int_eximarith_t)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
260 /* Unable to find partition sizes in this environment. */
270 /*************************************************
271 * Check space on spool and log partitions *
272 *************************************************/
274 /* This function is called before accepting a message; if any thresholds are
275 set, it checks them. If a message_size is supplied, it checks that there is
276 enough space for that size plus the threshold - i.e. that the message won't
277 reduce the space to the threshold. Not all OS have statvfs(); for those that
278 don't, this function always returns TRUE. For some OS the old function and
279 struct name statfs is used; that is handled by a macro, defined in exim.h.
282 msg_size the (estimated) size of an incoming message
284 Returns: FALSE if there isn't enough space, or if the information cannot
286 TRUE if no check was done or there is enough space
290 receive_check_fs(int msg_size)
292 int_eximarith_t space;
295 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
297 space = receive_statvfs(TRUE, &inodes);
300 debug_printf("spool directory space = " PR_EXIM_ARITH "K inodes = %d "
301 "check_space = " PR_EXIM_ARITH "K inodes = %d msg_size = %d\n",
302 space, inodes, check_spool_space, check_spool_inodes, msg_size);
304 if ( space >= 0 && space + msg_size / 1024 < check_spool_space
305 || inodes >= 0 && inodes < check_spool_inodes)
307 log_write(0, LOG_MAIN, "spool directory space check failed: space="
308 PR_EXIM_ARITH " inodes=%d", space, inodes);
313 if (check_log_space > 0 || check_log_inodes > 0)
315 space = receive_statvfs(FALSE, &inodes);
318 debug_printf("log directory space = " PR_EXIM_ARITH "K inodes = %d "
319 "check_space = " PR_EXIM_ARITH "K inodes = %d\n",
320 space, inodes, check_log_space, check_log_inodes);
322 if ( space >= 0 && space < check_log_space
323 || inodes >= 0 && inodes < check_log_inodes)
325 log_write(0, LOG_MAIN, "log directory space check failed: space=" PR_EXIM_ARITH
326 " inodes=%d", space, inodes);
336 /*************************************************
337 * Bomb out while reading a message *
338 *************************************************/
340 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
341 received, or if there is a timeout. A rarer case might be if the log files are
342 screwed up and Exim can't open them to record a message's arrival. Handling
343 that case is done by setting a flag to cause the log functions to call this
344 function if there is an ultimate disaster. That is why it is globally
348 reason text reason to pass to the not-quit ACL
349 msg default SMTP response to give if in an SMTP session
354 receive_bomb_out(uschar *reason, uschar *msg)
356 static BOOL already_bombing_out;
357 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
358 timeouts, if someone has something slow in their quit ACL. Since the only
359 things we should be doing are to close down cleanly ASAP, on the second
360 pass we also close down stuff that might be opened again, before bypassing
361 the ACL call and exiting. */
363 /* If spool_name is set, it contains the name of the data file that is being
364 written. Unlink it before closing so that it cannot be picked up by a delivery
365 process. Ensure that any header file is also removed. */
367 if (spool_name[0] != '\0')
370 spool_name[Ustrlen(spool_name) - 1] = 'H';
372 spool_name[0] = '\0';
375 /* Now close the file if it is open, either as a fd or a stream. */
379 (void)fclose(spool_data_file);
380 spool_data_file = NULL;
382 else if (data_fd >= 0)
384 (void)close(data_fd);
388 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
389 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
392 if (!already_bombing_out)
394 already_bombing_out = TRUE;
397 if (smtp_batched_input)
398 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
399 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
400 smtp_active_hostname, msg);
404 /* Exit from the program (non-BSMTP cases) */
406 exim_exit(EXIT_FAILURE);
410 /*************************************************
411 * Data read timeout *
412 *************************************************/
414 /* Handler function for timeouts that occur while reading the data that
417 Argument: the signal number
422 data_timeout_handler(int sig)
424 had_data_timeout = sig;
429 #ifdef HAVE_LOCAL_SCAN
430 /*************************************************
431 * local_scan() timeout *
432 *************************************************/
434 /* Handler function for timeouts that occur while running a local_scan()
435 function. Posix recommends against calling longjmp() from a signal-handler,
436 but the GCC manual says you can so we will, and trust that it's better than
437 calling probably non-signal-safe funxtions during logging from within the
438 handler, even with other compilers.
440 See also https://cwe.mitre.org/data/definitions/745.html which also lists
443 This is all because we have no control over what might be written for a
444 local-scan function, so cannot sprinkle had-signal checks after each
445 call-site. At least with the default "do-nothing" function we won't
448 Argument: the signal number
453 local_scan_timeout_handler(int sig)
455 had_local_scan_timeout = sig;
456 siglongjmp(local_scan_env, 1);
461 /*************************************************
462 * local_scan() crashed *
463 *************************************************/
465 /* Handler function for signals that occur while running a local_scan()
468 Argument: the signal number
473 local_scan_crash_handler(int sig)
475 had_local_scan_crash = sig;
476 siglongjmp(local_scan_env, 1);
479 #endif /*HAVE_LOCAL_SCAN*/
482 /*************************************************
483 * SIGTERM or SIGINT received *
484 *************************************************/
486 /* Handler for SIGTERM or SIGINT signals that occur while reading the
487 data that comprises a message.
489 Argument: the signal number
494 data_sigterm_sigint_handler(int sig)
496 had_data_sigint = sig;
501 /*************************************************
502 * Add new recipient to list *
503 *************************************************/
505 /* This function builds a list of recipient addresses in argc/argv
509 recipient the next address to add to recipients_list
510 pno parent number for fixed aliases; -1 otherwise
516 receive_add_recipient(uschar *recipient, int pno)
518 if (recipients_count >= recipients_list_max)
520 recipient_item *oldlist = recipients_list;
521 int oldmax = recipients_list_max;
523 const int safe_recipients_limit = INT_MAX / 2 / sizeof(recipient_item);
524 if (recipients_list_max < 0 || recipients_list_max >= safe_recipients_limit)
526 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Too many recipients: %d", recipients_list_max);
529 recipients_list_max = recipients_list_max ? 2*recipients_list_max : 50;
530 recipients_list = store_get(recipients_list_max * sizeof(recipient_item), FALSE);
532 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
535 recipients_list[recipients_count].address = recipient;
536 recipients_list[recipients_count].pno = pno;
537 #ifdef EXPERIMENTAL_BRIGHTMAIL
538 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
539 /* reset optin string pointer for next recipient */
540 bmi_current_optin = NULL;
542 recipients_list[recipients_count].orcpt = NULL;
543 recipients_list[recipients_count].dsn_flags = 0;
544 recipients_list[recipients_count++].errors_to = NULL;
550 /*************************************************
551 * Send user response message *
552 *************************************************/
554 /* This function is passed a default response code and a user message. It calls
555 smtp_message_code() to check and possibly modify the response code, and then
556 calls smtp_respond() to transmit the response. I put this into a function
557 just to avoid a lot of repetition.
560 code the response code
561 user_msg the user message
568 smtp_user_msg(uschar *code, uschar *user_msg)
571 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
572 smtp_respond(code, len, TRUE, user_msg);
580 /*************************************************
581 * Remove a recipient from the list *
582 *************************************************/
584 /* This function is provided for local_scan() to use.
587 recipient address to remove
589 Returns: TRUE if it did remove something; FALSE otherwise
593 receive_remove_recipient(uschar *recipient)
595 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
597 for (int count = 0; count < recipients_count; count++)
598 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
600 if ((--recipients_count - count) > 0)
601 memmove(recipients_list + count, recipients_list + count + 1,
602 (recipients_count - count)*sizeof(recipient_item));
612 /* Pause for a while waiting for input. If none received in that time,
613 close the logfile, if we had one open; then if we wait for a long-running
614 datasource (months, in one use-case) log rotation will not leave us holding
620 if (!receive_timeout && !receive_hasc())
623 timesince(&t, &received_time);
624 if (t.tv_sec > 30*60)
627 if (poll_one_fd(0, POLLIN, (30*60 - t.tv_sec) * 1000) == 0)
632 /*************************************************
633 * Read data portion of a non-SMTP message *
634 *************************************************/
636 /* This function is called to read the remainder of a message (following the
637 header) when the input is not from SMTP - we are receiving a local message on
638 a standard input stream. The message is always terminated by EOF, and is also
639 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
640 two cases for maximum efficiency.
642 Ensure that the body ends with a newline. This will naturally be the case when
643 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
644 as "sequences of lines" - this of course strictly applies only to SMTP, but
645 deliveries into BSD-type mailbox files also require it. Exim used to have a
646 flag for doing this at delivery time, but as it was always set for all
647 transports, I decided to simplify things by putting the check here instead.
649 There is at least one MUA (dtmail) that sends CRLF via this interface, and
650 other programs are known to do this as well. Exim used to have a option for
651 dealing with this: in July 2003, after much discussion, the code has been
652 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
654 However, for the case when a dot on a line by itself terminates a message, the
655 only recognized terminating sequences before and after the dot are LF and CRLF.
656 Otherwise, having read EOL . CR, you don't know whether to read another
659 Internally, in messages stored in Exim's spool files, LF is used as the line
660 terminator. Under the new regime, bare CRs will no longer appear in these
664 fout a FILE to which to write the message
666 Returns: One of the END_xxx values indicating why it stopped reading
670 read_message_data(FILE *fout)
674 register int linelength = 0;
676 /* Handle the case when only EOF terminates the message */
683 log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF;
686 if (ch == 0) body_zerocount++;
687 if (last_ch == '\r' && ch != '\n')
689 if (linelength > max_received_linelength)
690 max_received_linelength = linelength;
692 if (fputc('\n', fout) == EOF) return END_WERROR;
696 if (ch == '\r') continue;
698 if (fputc(ch, fout) == EOF) return END_WERROR;
701 if (linelength > max_received_linelength)
702 max_received_linelength = linelength;
707 if (++message_size > thismessage_size_limit) return END_SIZE;
712 if (linelength > max_received_linelength)
713 max_received_linelength = linelength;
714 if (fputc('\n', fout) == EOF) return END_WERROR;
722 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
726 while (log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
728 if (ch == 0) body_zerocount++;
731 case 0: /* Normal state (previous char written) */
735 if (linelength > max_received_linelength)
736 max_received_linelength = linelength;
741 { ch_state = 2; continue; }
744 case 1: /* After written "\n" */
745 if (ch == '.') { ch_state = 3; continue; }
746 if (ch == '\r') { ch_state = 2; continue; }
747 if (ch == '\n') { body_linecount++; linelength = -1; }
752 body_linecount++; /* After unwritten "\r" */
753 if (linelength > max_received_linelength)
754 max_received_linelength = linelength;
762 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
763 if (ch == '\r') continue;
769 case 3: /* After "\n." (\n written, dot not) */
770 if (ch == '\n') return END_DOT;
771 if (ch == '\r') { ch_state = 4; continue; }
774 if (fputc('.', fout) == EOF) return END_WERROR;
778 case 4: /* After "\n.\r" (\n written, rest not) */
779 if (ch == '\n') return END_DOT;
782 if (fputs(".\n", fout) == EOF) return END_WERROR;
783 if (ch == '\r') { ch_state = 2; continue; }
789 if (fputc(ch, fout) == EOF) return END_WERROR;
790 if (++message_size > thismessage_size_limit) return END_SIZE;
793 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
794 the message ends with a newline, and we must also write any characters that
795 were saved up while testing for an ending dot. */
799 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
800 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
801 message_size += Ustrlen(ends[ch_state]);
811 /*************************************************
812 * Read data portion of an SMTP message *
813 *************************************************/
815 /* This function is called to read the remainder of an SMTP message (after the
816 headers), or to skip over it when an error has occurred. In this case, the
817 output file is passed as NULL.
819 If any line begins with a dot, that character is skipped. The input should only
820 be successfully terminated by CR LF . CR LF unless it is local (non-network)
821 SMTP, in which case the CRs are optional, but...
823 FUDGE: It seems that sites on the net send out messages with just LF
824 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
825 we make the CRs optional in all cases.
827 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
828 well, so that there are no CRs in spooled messages. However, the message
829 terminating dot is not recognized between two bare CRs.
832 fout a FILE to which to write the message; NULL if skipping
834 Returns: One of the END_xxx values indicating why it stopped reading
838 read_message_data_smtp(FILE *fout)
844 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
846 if (ch == 0) body_zerocount++;
849 case 0: /* After LF or CRLF */
853 continue; /* Don't ever write . after LF */
857 /* Else fall through to handle as normal uschar. */
859 case 1: /* Normal state */
864 if (linelength > max_received_linelength)
865 max_received_linelength = linelength;
875 case 2: /* After (unwritten) CR */
877 if (linelength > max_received_linelength)
878 max_received_linelength = linelength;
887 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
888 cutthrough_data_put_nl();
889 if (ch != '\r') ch_state = 1; else continue;
893 case 3: /* After [CR] LF . */
901 /* The dot was removed at state 3. For a doubled dot, here, reinstate
902 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
903 and to file below. */
907 cutthrough_data_puts(&c, 1);
912 case 4: /* After [CR] LF . CR */
913 if (ch == '\n') return END_DOT;
916 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
917 cutthrough_data_put_nl();
927 /* Add the character to the spool file, unless skipping; then loop for the
934 if (fputc(ch, fout) == EOF) return END_WERROR;
935 if (message_size > thismessage_size_limit) return END_SIZE;
938 cutthrough_data_put_nl();
942 cutthrough_data_puts(&c, 1);
946 /* Fall through here if EOF encountered. This indicates some kind of error,
947 since a correct message is terminated by [CR] LF . [CR] LF. */
955 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
956 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
957 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
958 body_linecount accounting for proper re-expansion for the wire, so use
959 a cut-down version of the state-machine above; we don't need to do leading-dot
960 detection and unstuffing.
963 fout a FILE to which to write the message; NULL if skipping;
964 must be open for both writing and reading.
966 Returns: One of the END_xxx values indicating why it stopped reading
970 read_message_bdat_smtp(FILE *fout)
972 int linelength = 0, ch;
973 enum CH_STATE ch_state = LF_SEEN;
978 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
980 case EOF: return END_EOF;
981 case ERR: return END_PROTOCOL;
983 /* Nothing to get from the sender anymore. We check the last
984 character written to the spool.
986 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
987 If we would be strict, we would refuse such broken messages.
988 But we are liberal, so we fix it. It would be easy just to append
989 the "\n" to the spool.
991 But there are some more things (line counting, message size calculation and such),
992 that would need to be duplicated here. So we simply do some ungetc
997 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
998 if (fgetc(fout) == '\n') return END_DOT;
1001 if (linelength == -1) /* \r already seen (see below) */
1003 DEBUG(D_receive) debug_printf("Add missing LF\n");
1007 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
1008 bdat_ungetc('\r'); /* not even \r was seen */
1012 case '\0': body_zerocount++; break;
1016 case LF_SEEN: /* After LF or CRLF */
1017 ch_state = MID_LINE;
1018 /* fall through to handle as normal uschar. */
1020 case MID_LINE: /* Mid-line state */
1025 if (linelength > max_received_linelength)
1026 max_received_linelength = linelength;
1029 else if (ch == '\r')
1032 if (fix_nl) bdat_ungetc('\n');
1033 continue; /* don't write CR */
1037 case CR_SEEN: /* After (unwritten) CR */
1039 if (linelength > max_received_linelength)
1040 max_received_linelength = linelength;
1047 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
1048 cutthrough_data_put_nl();
1049 if (ch == '\r') continue; /* don't write CR */
1050 ch_state = MID_LINE;
1055 /* Add the character to the spool file, unless skipping */
1061 if (fputc(ch, fout) == EOF) return END_WERROR;
1062 if (message_size > thismessage_size_limit) return END_SIZE;
1065 cutthrough_data_put_nl();
1069 cutthrough_data_puts(&c, 1);
1076 read_message_bdat_smtp_wire(FILE *fout)
1080 /* Remember that this message uses wireformat. */
1082 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1083 fout ? "writing spoolfile in wire format" : "flushing input");
1084 f.spool_file_wireformat = TRUE;
1088 if (chunking_data_left > 0)
1090 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1091 uschar * buf = bdat_getbuf(&len);
1093 if (!buf) return END_EOF;
1094 message_size += len;
1095 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1097 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1099 case EOF: return END_EOF;
1100 case EOD: return END_DOT;
1101 case ERR: return END_PROTOCOL;
1107 max_received_linelength
1111 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1114 if (message_size > thismessage_size_limit) return END_SIZE;
1122 /*************************************************
1123 * Swallow SMTP message *
1124 *************************************************/
1126 /* This function is called when there has been some kind of error while reading
1127 an SMTP message, and the remaining data may need to be swallowed. It is global
1128 because it is called from smtp_closedown() to shut down an incoming call
1131 Argument: a FILE from which to read the message
1136 receive_swallow_smtp(void)
1138 if (message_ended >= END_NOTENDED)
1139 message_ended = chunking_state <= CHUNKING_OFFERED
1140 ? read_message_data_smtp(NULL)
1141 : read_message_bdat_smtp_wire(NULL);
1146 /*************************************************
1147 * Handle lost SMTP connection *
1148 *************************************************/
1150 /* This function logs connection loss incidents and generates an appropriate
1153 Argument: additional data for the message
1154 Returns: the SMTP response
1158 handle_lost_connection(uschar *s)
1160 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1161 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1162 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1163 return US"421 Lost incoming connection";
1169 /*************************************************
1170 * Handle a non-smtp reception error *
1171 *************************************************/
1173 /* This function is called for various errors during the reception of non-SMTP
1174 messages. It either sends a message to the sender of the problem message, or it
1175 writes to the standard error stream.
1178 errcode code for moan_to_sender(), identifying the error
1179 text1 first message text, passed to moan_to_sender()
1180 text2 second message text, used only for stderrr
1181 error_rc code to pass to exim_exit if no problem
1182 f FILE containing body of message (may be stdin)
1183 hptr pointer to instore headers or NULL
1185 Returns: calls exim_exit(), which does not return
1189 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1190 FILE *f, header_line *hptr)
1192 if (error_handling == ERRORS_SENDER)
1196 eblock.text1 = text1;
1197 eblock.text2 = US"";
1198 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1199 error_rc = EXIT_FAILURE;
1202 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1204 exim_exit(error_rc);
1209 /*************************************************
1210 * Add header lines set up by ACL *
1211 *************************************************/
1213 /* This function is called to add the header lines that were set up by
1214 statements in an ACL to the list of headers in memory. It is done in two stages
1215 like this, because when the ACL for RCPT is running, the other headers have not
1216 yet been received. This function is called twice; once just before running the
1217 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1218 are visible to the DATA ACL.
1220 Originally these header lines were added at the end. Now there is support for
1221 three different places: top, bottom, and after the Received: header(s). There
1222 will always be at least one Received: header, even if it is marked deleted, and
1223 even if something else has been put in front of it.
1226 acl_name text to identify which ACL
1232 add_acl_headers(int where, uschar *acl_name)
1234 header_line *last_received = NULL;
1238 case ACL_WHERE_DKIM:
1239 case ACL_WHERE_MIME:
1240 case ACL_WHERE_DATA:
1241 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1242 && (acl_removed_headers || acl_added_headers))
1244 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1245 " will not take effect on cutthrough deliveries");
1250 if (acl_removed_headers)
1252 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1254 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1256 const uschar * list = acl_removed_headers;
1257 int sep = ':'; /* This is specified as a colon-separated list */
1260 while ((s = string_nextinlist(&list, &sep, NULL, 0)))
1261 if (header_testname(h, s, Ustrlen(s), FALSE))
1263 h->type = htype_old;
1264 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1267 acl_removed_headers = NULL;
1268 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1271 if (!acl_added_headers) return;
1272 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1274 for (header_line * h = acl_added_headers, * next; h; h = next)
1281 h->next = header_list;
1283 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1289 last_received = header_list;
1290 while (!header_testname(last_received, US"Received", 8, FALSE))
1291 last_received = last_received->next;
1292 while (last_received->next &&
1293 header_testname(last_received->next, US"Received", 8, FALSE))
1294 last_received = last_received->next;
1296 h->next = last_received->next;
1297 last_received->next = h;
1298 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1302 /* add header before any header which is NOT Received: or Resent- */
1303 last_received = header_list;
1304 while ( last_received->next &&
1305 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1306 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1307 last_received = last_received->next;
1308 /* last_received now points to the last Received: or Resent-* header
1309 in an uninterrupted chain of those header types (seen from the beginning
1310 of all headers. Our current header must follow it. */
1311 h->next = last_received->next;
1312 last_received->next = h;
1313 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1318 header_last->next = h;
1319 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1323 if (!h->next) header_last = h;
1325 /* Check for one of the known header types (From:, To:, etc.) though in
1326 practice most added headers are going to be "other". Lower case
1327 identification letters are never stored with the header; they are used
1328 for existence tests when messages are received. So discard any lower case
1331 h->type = header_checkname(h, FALSE);
1332 if (h->type >= 'a') h->type = htype_other;
1334 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1337 acl_added_headers = NULL;
1338 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1343 /*************************************************
1344 * Add host information for log line *
1345 *************************************************/
1347 /* Called for acceptance and rejecting log lines. This adds information about
1348 the calling host to a string that is being built dynamically.
1351 s the dynamic string
1353 Returns: the extended string
1357 add_host_info_for_log(gstring * g)
1359 if (sender_fullhost)
1361 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1362 g = string_catn(g, US" DS", 3);
1363 g = string_append(g, 2, US" H=", sender_fullhost);
1364 if (LOGGING(incoming_interface) && interface_address)
1365 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1367 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1369 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1370 f.tcp_in_fastopen_logged = TRUE;
1373 g = string_append(g, 2, US" U=", sender_ident);
1374 if (received_protocol)
1375 g = string_append(g, 2, US" P=", received_protocol);
1376 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1378 g = string_catn(g, US" L", 2);
1379 #ifndef DISABLE_PIPE_CONNECT
1380 if (f.smtp_in_early_pipe_used)
1381 g = string_catn(g, US"*", 1);
1382 else if (f.smtp_in_early_pipe_advertised)
1383 g = string_catn(g, US".", 1);
1385 if (!f.smtp_in_pipelining_used)
1386 g = string_catn(g, US"-", 1);
1393 #ifdef WITH_CONTENT_SCAN
1395 /*************************************************
1396 * Run the MIME ACL on a message *
1397 *************************************************/
1399 /* This code is in a subroutine so that it can be used for both SMTP
1400 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1403 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1404 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1405 smtp_reply_ptr Where SMTP reply is being built
1406 blackholed_by_ptr Where "blackholed by" message is being built
1408 Returns: TRUE to carry on; FALSE to abandon the message
1412 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1413 uschar **blackholed_by_ptr)
1416 uschar * rfc822_file_path = NULL;
1417 unsigned long mbox_size;
1418 uschar *user_msg, *log_msg;
1419 int mime_part_count_buffer = -1;
1420 uschar * mbox_filename;
1423 /* check if it is a MIME message */
1425 for (header_line * my_headerlist = header_list; my_headerlist;
1426 my_headerlist = my_headerlist->next)
1427 if ( my_headerlist->type != '*' /* skip deleted headers */
1428 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1431 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1435 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1440 /* make sure the eml mbox file is spooled up */
1441 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1442 { /* error while spooling */
1443 log_write(0, LOG_MAIN|LOG_PANIC,
1444 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1445 Uunlink(spool_name);
1447 #ifdef EXPERIMENTAL_DCC
1450 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1451 message_id[0] = 0; /* Indicate no message accepted */
1452 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1453 return FALSE; /* Indicate skip to end of receive function */
1459 mime_part_count = -1;
1460 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1461 (void)fclose(mbox_file);
1463 if (rfc822_file_path)
1465 mime_part_count = mime_part_count_buffer;
1467 if (unlink(CS rfc822_file_path) == -1)
1469 log_write(0, LOG_PANIC,
1470 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1473 rfc822_file_path = NULL;
1476 /* check if we must check any message/rfc822 attachments */
1479 uschar * scandir = string_copyn(mbox_filename,
1480 Ustrrchr(mbox_filename, '/') - mbox_filename);
1481 struct dirent * entry;
1484 for (tempdir = exim_opendir(scandir); entry = readdir(tempdir); )
1485 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1487 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1489 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1495 if (rfc822_file_path)
1497 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1499 /* set RFC822 expansion variable */
1501 mime_part_count_buffer = mime_part_count;
1502 goto MIME_ACL_CHECK;
1504 log_write(0, LOG_PANIC,
1505 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1506 unlink(CS rfc822_file_path);
1511 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1514 recipients_count = 0;
1515 *blackholed_by_ptr = US"MIME ACL";
1516 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1520 Uunlink(spool_name);
1521 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1523 #ifdef EXPERIMENTAL_DCC
1528 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1529 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1530 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1532 message_id[0] = 0; /* Indicate no message accepted */
1533 return FALSE; /* Cause skip to end of receive function */
1539 #endif /* WITH_CONTENT_SCAN */
1544 received_header_gen(void)
1547 uschar * timestamp = expand_string(US"${tod_full}");
1548 header_line * received_header= header_list;
1550 if (recipients_count == 1) received_for = recipients_list[0].address;
1551 received = expand_string(received_header_text);
1552 received_for = NULL;
1556 if(spool_name[0] != 0)
1557 Uunlink(spool_name); /* Lose the data file */
1558 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1559 "(received_header_text) failed: %s", string_printing(received_header_text),
1560 expand_string_message);
1563 /* The first element on the header chain is reserved for the Received header,
1564 so all we have to do is fill in the text pointer, and set the type. However, if
1565 the result of the expansion is an empty string, we leave the header marked as
1566 "old" so as to refrain from adding a Received header. */
1570 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1571 received_header->type = htype_old;
1575 received_header->text = string_sprintf("%s;\n\t%s\n", received, timestamp);
1576 received_header->type = htype_received;
1579 received_header->slen = Ustrlen(received_header->text);
1581 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1582 received_header->type, received_header->text);
1587 /*************************************************
1589 *************************************************/
1591 /* Receive a message on the given input, and put it into a pair of spool files.
1592 Either a non-null list of recipients, or the extract flag will be true, or
1593 both. The flag sender_local is true for locally generated messages. The flag
1594 submission_mode is true if an ACL has obeyed "control = submission". The flag
1595 suppress_local_fixups is true if an ACL has obeyed "control =
1596 suppress_local_fixups" or -G was passed on the command-line.
1597 The flag smtp_input is true if the message is to be
1598 handled using SMTP conventions about termination and lines starting with dots.
1599 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1601 If a message was successfully read, message_id[0] will be non-zero.
1603 The general actions of this function are:
1605 . Read the headers of the message (if any) into a chain of store
1608 . If there is a "sender:" header and the message is locally originated,
1609 throw it away, unless the caller is trusted, or unless
1610 active_local_sender_retain is set - which can only happen if
1611 active_local_from_check is false.
1613 . If recipients are to be extracted from the message, build the
1614 recipients list from the headers, removing any that were on the
1615 original recipients list (unless extract_addresses_remove_arguments is
1616 false), and at the same time, remove any bcc header that may be present.
1618 . Get the spool file for the data, sort out its unique name, open
1619 and lock it (but don't give it the name yet).
1621 . Generate a "Message-Id" header if the message doesn't have one, for
1622 locally-originated messages.
1624 . Generate a "Received" header.
1626 . Ensure the recipients list is fully qualified and rewritten if necessary.
1628 . If there are any rewriting rules, apply them to the sender address
1629 and also to the headers.
1631 . If there is no from: header, generate one, for locally-generated messages
1632 and messages in "submission mode" only.
1634 . If the sender is local, check that from: is correct, and if not, generate
1635 a Sender: header, unless message comes from a trusted caller, or this
1636 feature is disabled by active_local_from_check being false.
1638 . If there is no "date" header, generate one, for locally-originated
1639 or submission mode messages only.
1641 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1642 dot_ends mode, to the data file. Leave it open, to hold the lock.
1644 . Write the envelope and the headers to a new file.
1646 . Set the name for the header file; close it.
1648 . Set the name for the data file; close it.
1650 Because this function can potentially be called many times in a single
1651 SMTP connection, all store should be got by store_get(), so that it will be
1652 automatically retrieved after the message is accepted.
1654 FUDGE: It seems that sites on the net send out messages with just LF
1655 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1656 we make the CRs optional in all cases.
1658 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1659 new regime is now in place in which bare CRs in header lines are turned into LF
1660 followed by a space, so as not to terminate the header line.
1662 February 2004: A bare LF in a header line in a message whose first line was
1663 terminated by CRLF is treated in the same way as a bare CR.
1666 extract_recip TRUE if recipients are to be extracted from the message's
1669 Returns: TRUE there are more messages to be read (SMTP input)
1670 FALSE there are no more messages to be read (non-SMTP input
1671 or SMTP connection collapsed, or other failure)
1673 When reading a message for filter testing, the returned value indicates
1674 whether the headers (which is all that is read) were terminated by '.' or
1678 receive_msg(BOOL extract_recip)
1682 int process_info_len = Ustrlen(process_info);
1683 int error_rc = error_handling == ERRORS_SENDER
1684 ? errors_sender_rc : EXIT_FAILURE;
1685 int header_size = 256;
1687 int prevlines_length = 0;
1688 const int id_resolution = BASE_62 == 62 ? 5000 : 10000;
1692 BOOL contains_resent_headers = FALSE;
1693 BOOL extracted_ignored = FALSE;
1694 BOOL first_line_ended_crlf = TRUE_UNSET;
1695 BOOL smtp_yield = TRUE;
1698 BOOL resents_exist = FALSE;
1699 uschar *resent_prefix = US"";
1700 uschar *blackholed_by = NULL;
1701 uschar *blackhole_log_msg = US"";
1702 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1705 error_block *bad_addresses = NULL;
1707 uschar *frozen_by = NULL;
1708 uschar *queued_by = NULL;
1711 rmark rcvd_log_reset_point;
1713 struct stat statbuf;
1715 /* Final message to give to SMTP caller, and messages from ACLs */
1717 uschar *smtp_reply = NULL;
1718 uschar *user_msg, *log_msg;
1720 /* Working header pointers */
1725 /* Flags for noting the existence of certain headers (only one left) */
1727 BOOL date_header_exists = FALSE;
1729 /* Pointers to receive the addresses of headers whose contents we need. */
1731 header_line *from_header = NULL;
1732 header_line *subject_header = NULL;
1733 header_line *msgid_header = NULL;
1734 header_line *received_header;
1735 BOOL msgid_header_newly_created = FALSE;
1737 /* Variables for use when building the Received: header. */
1742 /* Time of creation of message_id */
1744 static struct timeval message_id_tv = { 0, 0 };
1747 /* Release any open files that might have been cached while preparing to
1748 accept the message - e.g. by verifying addresses - because reading a message
1749 might take a fair bit of real time. */
1753 /* Extracting the recipient list from an input file is incompatible with
1754 cutthrough delivery with the no-spool option. It shouldn't be possible
1755 to set up the combination, but just in case kill any ongoing connection. */
1756 if (extract_recip || !smtp_input)
1757 cancel_cutthrough_connection(TRUE, US"not smtp input");
1759 /* Initialize the chain of headers by setting up a place-holder for Received:
1760 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1761 pointing to the end of the chain to make adding headers simple. */
1763 received_header = header_list = header_last = store_get(sizeof(header_line), FALSE);
1764 header_list->next = NULL;
1765 header_list->type = htype_old;
1766 header_list->text = NULL;
1767 header_list->slen = 0;
1769 /* Control block for the next header to be read. */
1771 reset_point = store_mark();
1772 next = store_get(sizeof(header_line), FALSE); /* not tainted */
1773 next->text = store_get(header_size, TRUE); /* tainted */
1775 /* Initialize message id to be null (indicating no message read), and the
1776 header names list to be the normal list. Indicate there is no data file open
1777 yet, initialize the size and warning count, and deal with no size limit. */
1780 spool_data_file = NULL;
1785 received_count = 1; /* For the one we will add */
1787 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1789 /* While reading the message, the following counts are computed. */
1791 message_linecount = body_linecount = body_zerocount =
1792 max_received_linelength = 0;
1794 #ifdef WITH_CONTENT_SCAN
1795 /* reset non-per-part mime variables */
1796 mime_is_coverletter = 0;
1798 mime_part_count = -1;
1801 #ifndef DISABLE_DKIM
1802 /* Call into DKIM to set up the context. In CHUNKING mode
1803 we clear the dot-stuffing flag */
1804 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1805 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1808 #ifdef SUPPORT_DMARC
1809 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1812 /* In SMTP sessions we may receive several messages in one connection. Before
1813 each subsequent one, we wait for the clock to tick at the level of message-id
1815 This is so that the combination of time+pid is unique, even on systems where the
1816 pid can be re-used within our time interval. We can't shorten the interval
1817 without re-designing the message-id. See comments above where the message id is
1818 created. This is Something For The Future.
1819 Do this wait any time we have previously created a message-id, even if we
1820 rejected the message. This gives unique IDs for logging done by ACLs.
1821 The initial timestamp must have been obtained via exim_gettime() to avoid
1822 issues on Linux with suspend/resume. */
1824 if (message_id_tv.tv_sec)
1826 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
1827 exim_wait_tick(&message_id_tv, id_resolution);
1830 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1831 ids, and fractions of a second are required. See the comments that precede the
1832 message id creation below.
1833 We use a routine that if possible uses a monotonic clock, and can be used again
1834 after reception for the tick-wait even under the Linux non-Posix behaviour. */
1837 exim_gettime(&message_id_tv);
1839 /* For other uses of the received time we can operate with granularity of one
1840 second, and for that we use the global variable received_time. This is for
1841 things like ultimate message timeouts.
1842 For this we do not care about the Linux suspend/resume problem, so rather than
1843 use exim_gettime() everywhere we use a plain gettimeofday() here. */
1845 gettimeofday(&received_time, NULL);
1847 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1848 happen in the smtp_getc() function when it refills its buffer. */
1850 had_data_timeout = 0;
1852 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1854 /* If not SMTP input, timeout happens only if configured, and we just set a
1855 single timeout for the whole message. */
1857 else if (receive_timeout > 0)
1859 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1860 ALARM(receive_timeout);
1863 /* SIGTERM and SIGINT are caught always. */
1865 had_data_sigint = 0;
1866 signal(SIGTERM, data_sigterm_sigint_handler);
1867 signal(SIGINT, data_sigterm_sigint_handler);
1869 /* Header lines in messages are not supposed to be very long, though when
1870 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1871 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1872 storing the header, and extend this as necessary using string_cat().
1874 To cope with total lunacies, impose an upper limit on the length of the header
1875 section of the message, as otherwise the store will fill up. We must also cope
1876 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1877 Folded header lines are joined into one string, leaving the '\n' characters
1878 inside them, so that writing them out reproduces the input.
1880 Loop for each character of each header; the next structure for chaining the
1881 header is set up already, with ptr the offset of the next character in
1886 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1888 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1889 SMTP must have a correct "." terminator. */
1891 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1893 smtp_reply = handle_lost_connection(US" (header)");
1895 goto TIDYUP; /* Skip to end of function */
1898 /* See if we are at the current header's size limit - there must be at least
1899 four bytes left. This allows for the new character plus a zero, plus two for
1900 extra insertions when we are playing games with dots and carriage returns. If
1901 we are at the limit, extend the text buffer. This could have been done
1902 automatically using string_cat() but because this is a tightish loop storing
1903 only one character at a time, we choose to do it inline. Normally
1904 store_extend() will be able to extend the block; only at the end of a big
1905 store block will a copy be needed. To handle the case of very long headers
1906 (and sometimes lunatic messages can have ones that are 100s of K long) we
1907 call store_release() for strings that have been copied - if the string is at
1908 the start of a block (and therefore the only thing in it, because we aren't
1909 doing any other gets), the block gets freed. We can only do this release if
1910 there were no allocations since the once that we want to free. */
1912 if (ptr >= header_size - 4)
1914 int oldsize = header_size;
1916 if (header_size >= INT_MAX/2)
1920 /* The data came from the message, so is tainted. */
1922 if (!store_extend(next->text, TRUE, oldsize, header_size))
1923 next->text = store_newblock(next->text, TRUE, header_size, ptr);
1926 /* Cope with receiving a binary zero. There is dispute about whether
1927 these should be allowed in RFC 822 messages. The middle view is that they
1928 should not be allowed in headers, at least. Exim takes this attitude at
1929 the moment. We can't just stomp on them here, because we don't know that
1930 this line is a header yet. Set a flag to cause scanning later. */
1932 if (ch == 0) had_zero++;
1934 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1935 those from data files use just LF. Treat LF in local SMTP input as a
1936 terminator too. Treat EOF as a line terminator always. */
1938 if (ch == EOF) goto EOL;
1940 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1941 other MTAs accept this. We are therefore forced into this "liberalisation"
1942 too, so we accept LF as a line terminator whatever the source of the message.
1943 However, if the first line of the message ended with a CRLF, we treat a bare
1944 LF specially by inserting a white space after it to ensure that the header
1945 line is not terminated. */
1949 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1950 else if (first_line_ended_crlf) receive_ungetc(' ');
1954 /* This is not the end of the line. If this is SMTP input and this is
1955 the first character in the line and it is a "." character, ignore it.
1956 This implements the dot-doubling rule, though header lines starting with
1957 dots aren't exactly common. They are legal in RFC 822, though. If the
1958 following is CRLF or LF, this is the line that that terminates the
1959 entire message. We set message_ended to indicate this has happened (to
1960 prevent further reading), and break out of the loop, having freed the
1961 empty header, and set next = NULL to indicate no data line. */
1963 if (ptr == 0 && ch == '.' && f.dot_ends)
1965 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1968 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1972 ch = '\r'; /* Revert to CR */
1977 message_ended = END_DOT;
1978 reset_point = store_reset(reset_point);
1980 break; /* End character-reading loop */
1983 /* For non-SMTP input, the dot at the start of the line was really a data
1984 character. What is now in ch is the following character. We guaranteed
1985 enough space for this above. */
1989 next->text[ptr++] = '.';
1994 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1995 remember this case if this is the first line ending. */
1999 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2002 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
2006 /* Otherwise, put back the character after CR, and turn the bare CR
2009 ch = (receive_ungetc)(ch);
2010 next->text[ptr++] = '\n';
2015 /* We have a data character for the header line. */
2017 next->text[ptr++] = ch; /* Add to buffer */
2018 message_size++; /* Total message size so far */
2020 /* Handle failure due to a humungously long header section. The >= allows
2021 for the terminating \n. Add what we have so far onto the headers list so
2022 that it gets reflected in any error message, and back up the just-read
2025 if (message_size >= header_maxsize)
2028 next->text[ptr] = 0;
2030 next->type = htype_other;
2032 header_last->next = next;
2035 log_write(0, LOG_MAIN, "ridiculously long message header received from "
2036 "%s (more than %d characters): message abandoned",
2037 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
2041 smtp_reply = US"552 Message header is ridiculously long";
2042 receive_swallow_smtp();
2043 goto TIDYUP; /* Skip to end of function */
2048 give_local_error(ERRMESS_VLONGHEADER,
2049 string_sprintf("message header longer than %d characters received: "
2050 "message not accepted", header_maxsize), US"", error_rc, stdin,
2052 /* Does not return */
2056 continue; /* With next input character */
2058 /* End of header line reached */
2062 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2064 receive_linecount++;
2065 message_linecount++;
2067 /* Keep track of maximum line length */
2069 if (ptr - prevlines_length > max_received_linelength)
2070 max_received_linelength = ptr - prevlines_length;
2071 prevlines_length = ptr + 1;
2073 /* Now put in the terminating newline. There is always space for
2074 at least two more characters. */
2076 next->text[ptr++] = '\n';
2079 /* A blank line signals the end of the headers; release the unwanted
2080 space and set next to NULL to indicate this. */
2084 reset_point = store_reset(reset_point);
2089 /* There is data in the line; see if the next input character is a
2090 whitespace character. If it is, we have a continuation of this header line.
2091 There is always space for at least one character at this point. */
2095 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2096 if (nextch == ' ' || nextch == '\t')
2098 next->text[ptr++] = nextch;
2099 if (++message_size >= header_maxsize)
2101 continue; /* Iterate the loop */
2103 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2104 else ch = EOF; /* Cause main loop to exit at end */
2107 /* We have got to the real line end. Terminate the string and release store
2108 beyond it. If it turns out to be a real header, internal binary zeros will
2109 be squashed later. */
2111 next->text[ptr] = 0;
2113 store_release_above(next->text + ptr + 1);
2115 /* Check the running total size against the overall message size limit. We
2116 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2117 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2118 headers - the code to read the body will then also hit the buffer. */
2120 if (message_size > thismessage_size_limit) break;
2122 /* A line that is not syntactically correct for a header also marks
2123 the end of the headers. In this case, we leave next containing the
2124 first data line. This might actually be several lines because of the
2125 continuation logic applied above, but that doesn't matter.
2127 It turns out that smail, and presumably sendmail, accept leading lines
2130 From ph10 Fri Jan 5 12:35 GMT 1996
2132 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2133 find any documentation of this, but for compatibility it had better be
2134 accepted. Exim restricts it to the case of non-smtp messages, and
2135 treats it as an alternative to the -f command line option. Thus it is
2136 ignored except for trusted users or filter testing. Otherwise it is taken
2137 as the sender address, unless -f was used (sendmail compatibility).
2139 It further turns out that some UUCPs generate the From_line in a different
2142 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2144 The regex for matching these things is now capable of recognizing both
2145 formats (including 2- and 4-digit years in the latter). In fact, the regex
2146 is now configurable, as is the expansion string to fish out the sender.
2148 Even further on it has been discovered that some broken clients send
2149 these lines in SMTP messages. There is now an option to ignore them from
2150 specified hosts or networks. Sigh. */
2152 if ( header_last == header_list
2154 || ( sender_host_address
2155 && verify_check_host(&ignore_fromline_hosts) == OK
2157 || (!sender_host_address && ignore_fromline_local)
2159 && regex_match_and_setup(regex_From, next->text, 0, -1)
2162 if (!f.sender_address_forced)
2164 uschar *uucp_sender = expand_string(uucp_from_sender);
2166 log_write(0, LOG_MAIN|LOG_PANIC,
2167 "expansion of \"%s\" failed after matching "
2168 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2171 int start, end, domain;
2173 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2174 &start, &end, &domain, TRUE);
2177 if (domain == 0 && newsender[0] != 0)
2178 /* deconst ok as newsender was not const */
2179 newsender = US rewrite_address_qualify(newsender, FALSE);
2181 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2183 sender_address = newsender;
2185 if (f.trusted_caller || filter_test != FTEST_NONE)
2187 authenticated_sender = NULL;
2188 originator_name = US"";
2189 f.sender_local = FALSE;
2192 if (filter_test != FTEST_NONE)
2193 printf("Sender taken from \"From \" line\n");
2200 /* Not a leading "From " line. Check to see if it is a valid header line.
2201 Header names may contain any non-control characters except space and colon,
2206 uschar *p = next->text;
2208 /* If not a valid header line, break from the header reading loop, leaving
2209 next != NULL, indicating that it holds the first line of the body. */
2211 if (isspace(*p)) break;
2212 while (mac_isgraph(*p) && *p != ':') p++;
2213 while (isspace(*p)) p++;
2216 body_zerocount = had_zero;
2220 /* We have a valid header line. If there were any binary zeroes in
2221 the line, stomp on them here. */
2224 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2227 /* It is perfectly legal to have an empty continuation line
2228 at the end of a header, but it is confusing to humans
2229 looking at such messages, since it looks like a blank line.
2230 Reduce confusion by removing redundant white space at the
2231 end. We know that there is at least one printing character
2232 (the ':' tested for above) so there is no danger of running
2235 p = next->text + ptr - 2;
2238 while (*p == ' ' || *p == '\t') p--;
2239 if (*p != '\n') break;
2240 ptr = (p--) - next->text + 1;
2241 message_size -= next->slen - ptr;
2242 next->text[ptr] = 0;
2246 /* Add the header to the chain */
2248 next->type = htype_other;
2250 header_last->next = next;
2253 /* Check the limit for individual line lengths. This comes after adding to
2254 the chain so that the failing line is reflected if a bounce is generated
2255 (for a local message). */
2257 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2259 log_write(0, LOG_MAIN, "overlong message header line received from "
2260 "%s (more than %d characters): message abandoned",
2261 f.sender_host_unknown ? sender_ident : sender_fullhost,
2262 header_line_maxsize);
2266 smtp_reply = US"552 A message header line is too long";
2267 receive_swallow_smtp();
2268 goto TIDYUP; /* Skip to end of function */
2272 give_local_error(ERRMESS_VLONGHDRLINE,
2273 string_sprintf("message header line longer than %d characters "
2274 "received: message not accepted", header_line_maxsize), US"",
2275 error_rc, stdin, header_list->next);
2276 /* Does not return */
2279 /* Note if any resent- fields exist. */
2281 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2283 resents_exist = TRUE;
2284 resent_prefix = US"Resent-";
2288 /* Reject CHUNKING messages that do not CRLF their first header line */
2290 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2292 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2293 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2295 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2296 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2297 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2300 goto TIDYUP; /* Skip to end of function */
2303 /* The line has been handled. If we have hit EOF, break out of the loop,
2304 indicating no pending data line. */
2306 if (ch == EOF) { next = NULL; break; }
2308 /* Set up for the next header */
2310 reset_point = store_mark();
2312 next = store_get(sizeof(header_line), FALSE);
2313 next->text = store_get(header_size, TRUE);
2316 prevlines_length = 0;
2317 } /* Continue, starting to read the next header */
2319 /* At this point, we have read all the headers into a data structure in main
2320 store. The first header is still the dummy placeholder for the Received: header
2321 we are going to generate a bit later on. If next != NULL, it contains the first
2322 data line - which terminated the headers before reaching a blank line (not the
2327 debug_printf(">>Headers received:\n");
2328 for (header_line * h = header_list->next; h; h = h->next)
2329 debug_printf("%s", h->text);
2333 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2334 is dropped immediately after valid headers, the next thing we will see is EOF.
2335 We must test for this specially, as further down the reading of the data is
2336 skipped if already at EOF. */
2338 if (smtp_input && (receive_feof)())
2340 smtp_reply = handle_lost_connection(US" (after header)");
2342 goto TIDYUP; /* Skip to end of function */
2345 /* If this is a filter test run and no headers were read, output a warning
2346 in case there is a mistake in the test message. */
2348 if (filter_test != FTEST_NONE && header_list->next == NULL)
2349 printf("Warning: no message headers read\n");
2352 /* Scan the headers to identify them. Some are merely marked for later
2353 processing; some are dealt with here. */
2355 for (header_line * h = header_list->next; h; h = h->next)
2357 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2358 if (is_resent) contains_resent_headers = TRUE;
2360 switch (header_checkname(h, is_resent))
2363 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2367 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2370 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2373 if (!resents_exist || is_resent) date_header_exists = TRUE;
2376 /* Same comments as about Return-Path: below. */
2378 case htype_delivery_date:
2379 if (delivery_date_remove) h->type = htype_old;
2382 /* Same comments as about Return-Path: below. */
2384 case htype_envelope_to:
2385 if (envelope_to_remove) h->type = htype_old;
2388 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2389 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2390 header consists of just the login id of the user who called Exim, rewrite
2391 it with the gecos field first. Apply this rule to Resent-From: if there
2392 are resent- fields. */
2395 h->type = htype_from;
2396 if (!resents_exist || is_resent)
2402 uschar *s = Ustrchr(h->text, ':') + 1;
2403 while (isspace(*s)) s++;
2404 len = h->slen - (s - h->text) - 1;
2405 if (Ustrlen(originator_login) == len &&
2406 strncmpic(s, originator_login, len) == 0)
2408 uschar *name = is_resent? US"Resent-From" : US"From";
2409 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2410 originator_login, qualify_domain_sender);
2411 from_header = header_last;
2412 h->type = htype_old;
2413 DEBUG(D_receive|D_rewrite)
2414 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2420 /* Identify the Message-id: header for generating "in-reply-to" in the
2421 autoreply transport. For incoming logging, save any resent- value. In both
2422 cases, take just the first of any multiples. */
2425 if (!msgid_header && (!resents_exist || is_resent))
2432 /* Flag all Received: headers */
2434 case htype_received:
2435 h->type = htype_received;
2439 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2441 case htype_reply_to:
2442 h->type = htype_reply_to;
2445 /* The Return-path: header is supposed to be added to messages when
2446 they leave the SMTP system. We shouldn't receive messages that already
2447 contain Return-path. However, since Exim generates Return-path: on
2448 local delivery, resent messages may well contain it. We therefore
2449 provide an option (which defaults on) to remove any Return-path: headers
2450 on input. Removal actually means flagging as "old", which prevents the
2451 header being transmitted with the message. */
2453 case htype_return_path:
2454 if (return_path_remove) h->type = htype_old;
2456 /* If we are testing a mail filter file, use the value of the
2457 Return-Path: header to set up the return_path variable, which is not
2458 otherwise set. However, remove any <> that surround the address
2459 because the variable doesn't have these. */
2461 if (filter_test != FTEST_NONE)
2463 uschar *start = h->text + 12;
2464 uschar *end = start + Ustrlen(start);
2465 while (isspace(*start)) start++;
2466 while (end > start && isspace(end[-1])) end--;
2467 if (*start == '<' && end[-1] == '>')
2472 return_path = string_copyn(start, end - start);
2473 printf("Return-path taken from \"Return-path:\" header line\n");
2477 /* If there is a "Sender:" header and the message is locally originated,
2478 and from an untrusted caller and suppress_local_fixups is not set, or if we
2479 are in submission mode for a remote message, mark it "old" so that it will
2480 not be transmitted with the message, unless active_local_sender_retain is
2481 set. (This can only be true if active_local_from_check is false.) If there
2482 are any resent- headers in the message, apply this rule to Resent-Sender:
2483 instead of Sender:. Messages with multiple resent- header sets cannot be
2484 tidily handled. (For this reason, at least one MUA - Pine - turns old
2485 resent- headers into X-resent- headers when resending, leaving just one
2489 h->type = !f.active_local_sender_retain
2490 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2491 || f.submission_mode
2493 && (!resents_exist || is_resent)
2494 ? htype_old : htype_sender;
2497 /* Remember the Subject: header for logging. There is no Resent-Subject */
2503 /* "To:" gets flagged, and the existence of a recipient header is noted,
2504 whether it's resent- or not. */
2509 to_or_cc_header_exists = TRUE;
2515 /* Extract recipients from the headers if that is required (the -t option).
2516 Note that this is documented as being done *before* any address rewriting takes
2517 place. There are two possibilities:
2519 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2520 recipients already listed are to be REMOVED from the message. Smail 3 works
2521 like this. We need to build a non-recipients tree for that list, because in
2522 subsequent processing this data is held in a tree and that's what the
2523 spool_write_header() function expects. Make sure that non-recipient addresses
2524 are fully qualified and rewritten if necessary.
2526 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2527 those in the command line arguments (and it is rumoured some other MTAs do
2528 this). Therefore, there is an option to make Exim behave this way.
2530 *** Notes on "Resent-" header lines ***
2532 The presence of resent-headers in the message makes -t horribly ambiguous.
2533 Experiments with sendmail showed that it uses recipients for all resent-
2534 headers, totally ignoring the concept of "sets of resent- headers" as described
2535 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2536 with all the addresses in one instance of each header.
2538 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2539 error for -t if there were resent- headers in the message. However, after a
2540 discussion on the mailing list, I've learned that there are MUAs that use
2541 resent- headers with -t, and also that the stuff about sets of resent- headers
2542 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2543 message with -t and resent- header lines makes sure that only *its* resent-
2544 headers are present; previous ones are often renamed as X-resent- for example.
2546 Consequently, Exim has been changed so that, if any resent- header lines are
2547 present, the recipients are taken from all of the appropriate resent- lines,
2548 and not from the ordinary To:, Cc:, etc. */
2553 error_block **bnext = &bad_addresses;
2555 if (extract_addresses_remove_arguments)
2557 while (recipients_count-- > 0)
2559 const uschar * s = rewrite_address(recipients_list[recipients_count].address,
2560 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2561 tree_add_nonrecipient(s);
2563 recipients_list = NULL;
2564 recipients_count = recipients_list_max = 0;
2567 /* Now scan the headers */
2569 for (header_line * h = header_list->next; h; h = h->next)
2571 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2572 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2574 uschar *s = Ustrchr(h->text, ':') + 1;
2575 while (isspace(*s)) s++;
2577 f.parse_allow_group = TRUE; /* Allow address group syntax */
2581 uschar *ss = parse_find_address_end(s, FALSE);
2582 uschar *recipient, *errmess, *pp;
2583 int start, end, domain;
2585 /* Check on maximum */
2587 if (recipients_max > 0 && ++rcount > recipients_max)
2588 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2589 US"message rejected: ", error_rc, stdin, NULL);
2590 /* Does not return */
2592 /* Make a copy of the address, and remove any internal newlines. These
2593 may be present as a result of continuations of the header line. The
2594 white space that follows the newline must not be removed - it is part
2597 pp = recipient = store_get(ss - s + 1, is_tainted(s));
2598 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2603 BOOL b = allow_utf8_domains;
2604 allow_utf8_domains = TRUE;
2606 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2611 if (string_is_utf8(recipient)) message_smtputf8 = TRUE;
2612 else allow_utf8_domains = b;
2618 /* Keep a list of all the bad addresses so we can send a single
2619 error message at the end. However, an empty address is not an error;
2620 just ignore it. This can come from an empty group list like
2622 To: Recipients of list:;
2624 If there are no recipients at all, an error will occur later. */
2626 if (!recipient && Ustrcmp(errmess, "empty address") != 0)
2628 int len = Ustrlen(s);
2629 error_block *b = store_get(sizeof(error_block), FALSE);
2630 while (len > 0 && isspace(s[len-1])) len--;
2632 b->text1 = string_printing(string_copyn(s, len));
2638 /* If the recipient is already in the nonrecipients tree, it must
2639 have appeared on the command line with the option extract_addresses_
2640 remove_arguments set. Do not add it to the recipients, and keep a note
2641 that this has happened, in order to give a better error if there are
2642 no recipients left. */
2644 else if (recipient != NULL)
2646 if (tree_search(tree_nonrecipients, recipient) == NULL)
2647 receive_add_recipient(recipient, -1);
2649 extracted_ignored = TRUE;
2652 /* Move on past this address */
2654 s = ss + (*ss? 1:0);
2655 while (isspace(*s)) s++;
2656 } /* Next address */
2658 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2659 f.parse_found_group = FALSE;
2661 /* If this was the bcc: header, mark it "old", which means it
2662 will be kept on the spool, but not transmitted as part of the
2665 if (h->type == htype_bcc) h->type = htype_old;
2666 } /* For appropriate header line */
2667 } /* For each header line */
2671 /* Now build the unique message id. This has changed several times over the
2672 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2673 Retaining all the history in the comment has become too unwieldy - read
2674 previous release sources if you want it.
2676 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2677 The first part is the current time, in seconds. The second part is the current
2678 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2679 can hold a number in the range 0-3843. It used to be a computed sequence
2680 number, but is now the fractional component of the current time in units of
2681 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2682 received, Exim ensures that the timer has ticked at the appropriate level
2683 before proceeding, to avoid duplication if the pid happened to be re-used
2684 within the same time period. It seems likely that most messages will take at
2685 least half a millisecond to be received, so no delay will normally be
2686 necessary. At least for some time...
2688 There is a modification when localhost_number is set. Formerly this was allowed
2689 to be as large as 255. Now it is restricted to the range 0-16, and the final
2690 component of the message id becomes (localhost_number * 200) + fractional time
2691 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2693 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2694 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2695 still allows the tttttt field to hold a large enough number to last for some
2696 more decades, and the final two-digit field can hold numbers up to 1295, which
2697 is enough for milliseconds (instead of 1/2000 of a second).
2699 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2700 pid, so it is probably safe because pids have to be positive. The
2701 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2702 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2704 Note that string_base62() returns its data in a static storage block, so it
2705 must be copied before calling string_base62() again. It always returns exactly
2708 There doesn't seem to be anything in the RFC which requires a message id to
2709 start with a letter, but Smail was changed to ensure this. The external form of
2710 the message id (as supplied by string expansion) therefore starts with an
2711 additional leading 'E'. The spool file names do not include this leading
2712 letter and it is not used internally.
2714 NOTE: If ever the format of message ids is changed, the regular expression for
2715 checking that a string is in this format must be updated in a corresponding
2716 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2717 must also be changed to reflect the correct string length. The queue-sort code
2718 needs to know the layout. Then, of course, other programs that rely on the
2719 message id format will need updating too. */
2721 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2722 message_id[6] = '-';
2723 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2725 /* Deal with the case where the host number is set. The value of the number was
2726 checked when it was read, to ensure it isn't too big. */
2728 if (host_number_string)
2729 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2730 string_base62((long int)(
2731 host_number * (1000000/id_resolution) +
2732 message_id_tv.tv_usec/id_resolution)) + 4);
2734 /* Host number not set: final field is just the fractional time at an
2735 appropriate resolution. */
2738 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2739 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2741 /* Add the current message id onto the current process info string if
2744 (void)string_format(process_info + process_info_len,
2745 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2747 /* If we are using multiple input directories, set up the one for this message
2748 to be the least significant base-62 digit of the time of arrival. Otherwise
2749 ensure that it is an empty string. */
2751 set_subdir_str(message_subdir, message_id, 0);
2753 /* Now that we have the message-id, if there is no message-id: header, generate
2754 one, but only for local (without suppress_local_fixups) or submission mode
2755 messages. This can be user-configured if required, but we had better flatten
2756 any illegal characters therein. */
2759 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2761 uschar *id_text = US"";
2762 uschar *id_domain = primary_hostname;
2765 /* Permit only letters, digits, dots, and hyphens in the domain */
2767 if (message_id_domain)
2769 uschar *new_id_domain = expand_string(message_id_domain);
2772 if (!f.expand_string_forcedfail)
2773 log_write(0, LOG_MAIN|LOG_PANIC,
2774 "expansion of \"%s\" (message_id_header_domain) "
2775 "failed: %s", message_id_domain, expand_string_message);
2777 else if (*new_id_domain)
2779 id_domain = new_id_domain;
2780 for (uschar * p = id_domain; *p; p++)
2781 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2785 /* Permit all characters except controls and RFC 2822 specials in the
2786 additional text part. */
2788 if (message_id_text)
2790 uschar *new_id_text = expand_string(message_id_text);
2793 if (!f.expand_string_forcedfail)
2794 log_write(0, LOG_MAIN|LOG_PANIC,
2795 "expansion of \"%s\" (message_id_header_text) "
2796 "failed: %s", message_id_text, expand_string_message);
2798 else if (*new_id_text)
2800 id_text = new_id_text;
2801 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2805 /* Add the header line.
2806 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2807 appended, to preserve classical expectations of header ordering. */
2809 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2810 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2811 *id_text == 0 ? "" : ".", id_text, id_domain);
2813 /* Arrange for newly-created Message-Id to be logged */
2817 msgid_header_newly_created = TRUE;
2822 /* If we are to log recipients, keep a copy of the raw ones before any possible
2823 rewriting. Must copy the count, because later ACLs and the local_scan()
2824 function may mess with the real recipients. */
2826 if (LOGGING(received_recipients))
2828 raw_recipients = store_get(recipients_count * sizeof(uschar *), FALSE);
2829 for (int i = 0; i < recipients_count; i++)
2830 raw_recipients[i] = string_copy(recipients_list[i].address);
2831 raw_recipients_count = recipients_count;
2834 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2835 recipients will get here only if the conditions were right (allow_unqualified_
2836 recipient is TRUE). */
2839 { debug_printf_indent("qualify & rewrite recipients list\n"); acl_level++; }
2840 for (int i = 0; i < recipients_count; i++)
2841 recipients_list[i].address = /* deconst ok as src was not cont */
2842 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2843 global_rewrite_rules, rewrite_existflags);
2844 DEBUG(D_rewrite) acl_level--;
2846 /* If there is no From: header, generate one for local (without
2847 suppress_local_fixups) or submission_mode messages. If there is no sender
2848 address, but the sender is local or this is a local delivery error, use the
2849 originator login. This shouldn't happen for genuine bounces, but might happen
2850 for autoreplies. The addition of From: must be done *before* checking for the
2851 possible addition of a Sender: header, because untrusted_set_sender allows an
2852 untrusted user to set anything in the envelope (which might then get info
2853 From:) but we still want to ensure a valid Sender: if it is required. */
2856 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2858 const uschar * oname = US"";
2860 /* Use the originator_name if this is a locally submitted message and the
2861 caller is not trusted. For trusted callers, use it only if -F was used to
2862 force its value or if we have a non-SMTP message for which -f was not used
2863 to set the sender. */
2865 if (!sender_host_address)
2867 if (!f.trusted_caller || f.sender_name_forced ||
2868 (!smtp_input && !f.sender_address_forced))
2869 oname = originator_name;
2872 /* For non-locally submitted messages, the only time we use the originator
2873 name is when it was forced by the /name= option on control=submission. */
2875 else if (submission_name) oname = submission_name;
2877 /* Envelope sender is empty */
2879 if (!*sender_address)
2881 uschar *fromstart, *fromend;
2883 fromstart = string_sprintf("%sFrom: %s%s",
2884 resent_prefix, oname, *oname ? " <" : "");
2885 fromend = *oname ? US">" : US"";
2887 if (f.sender_local || f.local_error_message)
2888 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2889 local_part_quote(originator_login), qualify_domain_sender,
2892 else if (f.submission_mode && authenticated_id)
2894 if (!submission_domain)
2895 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2896 local_part_quote(authenticated_id), qualify_domain_sender,
2899 else if (!*submission_domain) /* empty => whole address set */
2900 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2904 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2905 local_part_quote(authenticated_id), submission_domain, fromend);
2907 from_header = header_last; /* To get it checked for Sender: */
2911 /* There is a non-null envelope sender. Build the header using the original
2912 sender address, before any rewriting that might have been done while
2917 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2920 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2923 from_header = header_last; /* To get it checked for Sender: */
2928 /* If the sender is local (without suppress_local_fixups), or if we are in
2929 submission mode and there is an authenticated_id, check that an existing From:
2930 is correct, and if not, generate a Sender: header, unless disabled. Any
2931 previously-existing Sender: header was removed above. Note that sender_local,
2932 as well as being TRUE if the caller of exim is not trusted, is also true if a
2933 trusted caller did not supply a -f argument for non-smtp input. To allow
2934 trusted callers to forge From: without supplying -f, we have to test explicitly
2935 here. If the From: header contains more than one address, then the call to
2936 parse_extract_address fails, and a Sender: header is inserted, as required. */
2939 && ( f.active_local_from_check
2940 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2941 || f.submission_mode && authenticated_id
2944 BOOL make_sender = TRUE;
2945 int start, end, domain;
2947 uschar *from_address =
2948 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2949 &start, &end, &domain, FALSE);
2950 uschar *generated_sender_address;
2952 generated_sender_address = f.submission_mode
2953 ? !submission_domain
2954 ? string_sprintf("%s@%s",
2955 local_part_quote(authenticated_id), qualify_domain_sender)
2956 : !*submission_domain /* empty => full address */
2957 ? string_sprintf("%s", authenticated_id)
2958 : string_sprintf("%s@%s",
2959 local_part_quote(authenticated_id), submission_domain)
2960 : string_sprintf("%s@%s",
2961 local_part_quote(originator_login), qualify_domain_sender);
2963 /* Remove permitted prefixes and suffixes from the local part of the From:
2964 address before doing the comparison with the generated sender. */
2969 uschar *at = domain ? from_address + domain - 1 : NULL;
2972 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2973 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2975 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2976 from_address += slen;
2980 if ( strcmpic(generated_sender_address, from_address) == 0
2981 || (!domain && strcmpic(from_address, originator_login) == 0))
2982 make_sender = FALSE;
2985 /* We have to cause the Sender header to be rewritten if there are
2986 appropriate rewriting rules. */
2989 if (f.submission_mode && !submission_name)
2990 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2991 generated_sender_address);
2993 header_add(htype_sender, "%sSender: %s <%s>\n",
2995 f.submission_mode ? submission_name : originator_name,
2996 generated_sender_address);
2998 /* Ensure that a non-null envelope sender address corresponds to the
2999 submission mode sender address. */
3001 if (f.submission_mode && *sender_address)
3003 if (!sender_address_unrewritten)
3004 sender_address_unrewritten = sender_address;
3005 sender_address = generated_sender_address;
3006 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
3007 log_write(L_address_rewrite, LOG_MAIN,
3008 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
3009 sender_address_unrewritten, generated_sender_address);
3013 /* If there are any rewriting rules, apply them to the sender address, unless
3014 it has already been rewritten as part of verification for SMTP input. */
3017 { debug_printf("global rewrite rules\n"); acl_level++; }
3018 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
3020 /* deconst ok as src was not const */
3021 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
3022 global_rewrite_rules, rewrite_existflags);
3023 DEBUG(D_receive|D_rewrite)
3024 debug_printf("rewritten sender = %s\n", sender_address);
3026 DEBUG(D_rewrite) acl_level--;
3029 /* The headers must be run through rewrite_header(), because it ensures that
3030 addresses are fully qualified, as well as applying any rewriting rules that may
3033 Qualification of header addresses in a message from a remote host happens only
3034 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
3035 appropriate. For local messages, qualification always happens, unless -bnq is
3036 used to explicitly suppress it. No rewriting is done for an unqualified address
3037 that is left untouched.
3039 We start at the second header, skipping our own Received:. This rewriting is
3040 documented as happening *after* recipient addresses are taken from the headers
3041 by the -t command line option. An added Sender: gets rewritten here. */
3044 { debug_printf("rewrite headers\n"); acl_level++; }
3045 for (header_line * h = header_list->next, * newh; h; h = h->next)
3046 if ((newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3047 rewrite_existflags, TRUE)))
3049 DEBUG(D_rewrite) acl_level--;
3052 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3053 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3054 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3055 exists, this applies to the set of resent- headers rather than the normal set.
3057 The requirement for a recipient header has been removed in RFC 2822. At this
3058 point in the code, earlier versions of Exim added a To: header for locally
3059 submitted messages, and an empty Bcc: header for others. In the light of the
3060 changes in RFC 2822, this was dropped in November 2003. */
3063 /* If there is no date header, generate one if the message originates locally
3064 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3065 submission mode flag is set. Messages without Date: are not valid, but it seems
3066 to be more confusing if Exim adds one to all remotely-originated messages.
3067 As per Message-Id, we prepend if resending, else append.
3070 if ( !date_header_exists
3071 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3072 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3073 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3075 search_tidyup(); /* Free any cached resources */
3077 /* Show the complete set of headers if debugging. Note that the first one (the
3078 new Received:) has not yet been set. */
3082 debug_printf(">>Headers after rewriting and local additions:\n");
3083 for (header_line * h = header_list->next; h; h = h->next)
3084 debug_printf("%c %s", h->type, h->text);
3088 /* The headers are now complete in store. If we are running in filter
3089 testing mode, that is all this function does. Return TRUE if the message
3090 ended with a dot. */
3092 if (filter_test != FTEST_NONE)
3094 process_info[process_info_len] = 0;
3095 return message_ended == END_DOT;
3098 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3099 think more if it could be handled. Cannot do onward CHUNKING unless
3100 inbound is, but inbound chunking ought to be ok with outbound plain.
3101 Could we do onward CHUNKING given inbound CHUNKING?
3103 if (chunking_state > CHUNKING_OFFERED)
3104 cancel_cutthrough_connection(FALSE, US"chunking active");
3106 /* Cutthrough delivery:
3107 We have to create the Received header now rather than at the end of reception,
3108 so the timestamp behaviour is a change to the normal case.
3109 Having created it, send the headers to the destination. */
3111 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3113 if (received_count > received_headers_max)
3115 cancel_cutthrough_connection(TRUE, US"too many headers");
3116 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3117 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3118 "Too many \"Received\" headers",
3120 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3121 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3122 message_id[0] = 0; /* Indicate no message accepted */
3123 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3124 goto TIDYUP; /* Skip to end of function */
3126 received_header_gen();
3127 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3128 (void) cutthrough_headers_send();
3132 /* Open a new spool file for the data portion of the message. We need
3133 to access it both via a file descriptor and a stream. Try to make the
3134 directory if it isn't there. */
3136 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3137 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3139 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3141 if (errno == ENOENT)
3143 (void) directory_make(spool_directory,
3144 spool_sname(US"input", message_subdir),
3145 INPUT_DIRECTORY_MODE, TRUE);
3146 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3149 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3150 spool_name, strerror(errno));
3153 /* Make sure the file's group is the Exim gid, and double-check the mode
3154 because the group setting doesn't always get set automatically. */
3156 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3157 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3158 "Failed setting ownership on spool file %s: %s",
3159 spool_name, strerror(errno));
3160 (void)fchmod(data_fd, SPOOL_MODE);
3162 /* We now have data file open. Build a stream for it and lock it. We lock only
3163 the first line of the file (containing the message ID) because otherwise there
3164 are problems when Exim is run under Cygwin (I'm told). See comments in
3165 spool_in.c, where the same locking is done. */
3167 spool_data_file = fdopen(data_fd, "w+");
3168 lock_data.l_type = F_WRLCK;
3169 lock_data.l_whence = SEEK_SET;
3170 lock_data.l_start = 0;
3171 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3173 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3174 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3175 errno, strerror(errno));
3177 /* We have an open, locked data file. Write the message id to it to make it
3178 self-identifying. Then read the remainder of the input of this message and
3179 write it to the data file. If the variable next != NULL, it contains the first
3180 data line (which was read as a header but then turned out not to have the right
3181 format); write it (remembering that it might contain binary zeros). The result
3182 of fwrite() isn't inspected; instead we call ferror() below. */
3184 fprintf(spool_data_file, "%s-D\n", message_id);
3187 uschar *s = next->text;
3188 int len = next->slen;
3189 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3190 body_linecount++; /* Assumes only 1 line */
3193 /* Note that we might already be at end of file, or the logical end of file
3194 (indicated by '.'), or might have encountered an error while writing the
3195 message id or "next" line. */
3197 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3201 message_ended = chunking_state <= CHUNKING_OFFERED
3202 ? read_message_data_smtp(spool_data_file)
3204 ? read_message_bdat_smtp_wire(spool_data_file)
3205 : read_message_bdat_smtp(spool_data_file);
3206 receive_linecount++; /* The terminating "." line */
3209 message_ended = read_message_data(spool_data_file);
3211 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3212 message_linecount += body_linecount;
3214 switch (message_ended)
3216 /* Handle premature termination of SMTP */
3221 Uunlink(spool_name); /* Lose data file when closed */
3222 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3223 message_id[0] = 0; /* Indicate no message accepted */
3224 smtp_reply = handle_lost_connection(US"");
3226 goto TIDYUP; /* Skip to end of function */
3230 /* Handle message that is too big. Don't use host_or_ident() in the log
3231 message; we want to see the ident value even for non-remote messages. */
3234 Uunlink(spool_name); /* Lose the data file when closed */
3235 cancel_cutthrough_connection(TRUE, US"mail too big");
3236 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3238 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3239 "message too big: read=%d max=%d",
3241 sender_fullhost ? " H=" : "",
3242 sender_fullhost ? sender_fullhost : US"",
3243 sender_ident ? " U=" : "",
3244 sender_ident ? sender_ident : US"",
3246 thismessage_size_limit);
3250 smtp_reply = US"552 Message size exceeds maximum permitted";
3251 message_id[0] = 0; /* Indicate no message accepted */
3252 goto TIDYUP; /* Skip to end of function */
3256 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3257 give_local_error(ERRMESS_TOOBIG,
3258 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3259 US"message rejected: ", error_rc, spool_data_file, header_list);
3260 /* Does not return */
3264 /* Handle bad BDAT protocol sequence */
3267 Uunlink(spool_name); /* Lose the data file when closed */
3268 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3269 smtp_reply = US""; /* Response already sent */
3270 message_id[0] = 0; /* Indicate no message accepted */
3271 goto TIDYUP; /* Skip to end of function */
3275 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3276 example, there may be some expansion in an ACL that uses a timer.) */
3278 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3280 /* The message body has now been read into the data file. Call fflush() to
3281 empty the buffers in C, and then call fsync() to get the data written out onto
3282 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3283 having to do this). If there was an I/O error on either input or output,
3284 attempt to send an error message, and unlink the spool file. For non-SMTP input
3285 we can then give up. Note that for SMTP input we must swallow the remainder of
3286 the input in cases of output errors, since the far end doesn't expect to see
3287 anything until the terminating dot line is sent. */
3289 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3290 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3292 uschar *msg_errno = US strerror(errno);
3293 BOOL input_error = (receive_ferror)() != 0;
3294 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3295 input_error? "Input read" : "Spool write",
3297 sender_fullhost ? sender_fullhost : sender_ident);
3299 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3300 Uunlink(spool_name); /* Lose the data file */
3301 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3306 smtp_reply = US"451 Error while reading input data";
3309 smtp_reply = US"451 Error while writing spool file";
3310 receive_swallow_smtp();
3312 message_id[0] = 0; /* Indicate no message accepted */
3313 goto TIDYUP; /* Skip to end of function */
3318 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3319 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3321 /* Does not return */
3326 /* No I/O errors were encountered while writing the data file. */
3328 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3329 gettimeofday(&received_time_complete, NULL);
3332 /* If there were any bad addresses extracted by -t, or there were no recipients
3333 left after -t, send a message to the sender of this message, or write it to
3334 stderr if the error handling option is set that way. Note that there may
3335 legitimately be no recipients for an SMTP message if they have all been removed
3338 We need to rewind the data file in order to read it. In the case of no
3339 recipients or stderr error writing, throw the data file away afterwards, and
3340 exit. (This can't be SMTP, which always ensures there's at least one
3341 syntactically good recipient address.) */
3343 if (extract_recip && (bad_addresses || recipients_count == 0))
3347 if (recipients_count == 0) debug_printf("*** No recipients\n");
3350 debug_printf("*** Bad address(es)\n");
3351 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3352 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3356 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3357 message_id, bad_addresses ? "bad addresses" : "no recipients");
3359 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3361 /* If configured to send errors to the sender, but this fails, force
3362 a failure error code. We use a special one for no recipients so that it
3363 can be detected by the autoreply transport. Otherwise error_rc is set to
3364 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3365 it is EXIT_SUCCESS. */
3367 if (error_handling == ERRORS_SENDER)
3369 if (!moan_to_sender(
3371 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3372 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3373 bad_addresses, header_list, spool_data_file, FALSE
3375 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3380 if (extracted_ignored)
3381 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3383 fprintf(stderr, "exim: no recipients in message\n");
3386 fprintf(stderr, "exim: invalid address%s",
3387 bad_addresses->next ? "es:\n" : ":");
3388 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3389 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3390 bad_addresses->text2);
3394 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3396 Uunlink(spool_name);
3397 (void)fclose(spool_data_file);
3398 exim_exit(error_rc);
3402 /* Data file successfully written. Generate text for the Received: header by
3403 expanding the configured string, and adding a timestamp. By leaving this
3404 operation till now, we ensure that the timestamp is the time that message
3405 reception was completed. However, this is deliberately done before calling the
3406 data ACL and local_scan().
3408 This Received: header may therefore be inspected by the data ACL and by code in
3409 the local_scan() function. When they have run, we update the timestamp to be
3410 the final time of reception.
3412 If there is just one recipient, set up its value in the $received_for variable
3413 for use when we generate the Received: header.
3415 Note: the checking for too many Received: headers is handled by the delivery
3417 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3419 if (!received_header->text) /* Non-cutthrough case */
3421 received_header_gen();
3423 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3425 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3426 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3428 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3429 now, before running the DATA ACL. */
3431 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3434 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3435 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3437 /* If an ACL is specified for checking things at this stage of reception of a
3438 message, run it, unless all the recipients were removed by "discard" in earlier
3439 ACLs. That is the only case in which recipients_count can be zero at this
3440 stage. Set deliver_datafile to point to the data file so that $message_body and
3441 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3444 deliver_datafile = data_fd;
3447 f.enable_dollar_recipients = TRUE;
3449 if (recipients_count == 0)
3450 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3454 /* Handle interactive SMTP messages */
3456 if (smtp_input && !smtp_batched_input)
3459 #ifndef DISABLE_DKIM
3460 if (!f.dkim_disable_verify)
3462 /* Finish verification */
3463 dkim_exim_verify_finish();
3465 /* Check if we must run the DKIM ACL */
3466 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3468 uschar * dkim_verify_signers_expanded =
3469 expand_string(dkim_verify_signers);
3470 gstring * results = NULL;
3474 gstring * seen_items = NULL;
3475 int old_pool = store_pool;
3477 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3479 if (!(ptr = dkim_verify_signers_expanded))
3480 log_write(0, LOG_MAIN|LOG_PANIC,
3481 "expansion of dkim_verify_signers option failed: %s",
3482 expand_string_message);
3484 /* Default to OK when no items are present */
3486 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3488 /* Prevent running ACL for an empty item */
3489 if (!item || !*item) continue;
3491 /* Only run ACL once for each domain or identity,
3492 no matter how often it appears in the expanded list. */
3496 const uschar * seen_items_list = string_from_gstring(seen_items);
3498 BOOL seen_this_item = FALSE;
3500 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3502 if (Ustrcmp(seen_item,item) == 0)
3504 seen_this_item = TRUE;
3511 debug_printf("acl_smtp_dkim: skipping signer %s, "
3512 "already seen\n", item);
3516 seen_items = string_catn(seen_items, US":", 1);
3518 seen_items = string_cat(seen_items, item);
3520 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3524 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3525 "skipping remaining items\n", rc, item);
3526 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3530 dkim_verify_status = string_from_gstring(results);
3531 store_pool = old_pool;
3532 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3535 recipients_count = 0;
3536 blackholed_by = US"DKIM ACL";
3538 blackhole_log_msg = string_sprintf(": %s", log_msg);
3542 Uunlink(spool_name);
3543 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3544 smtp_yield = FALSE; /* No more messages after dropped connection */
3545 smtp_reply = US""; /* Indicate reply already sent */
3546 message_id[0] = 0; /* Indicate no message accepted */
3547 goto TIDYUP; /* Skip to end of function */
3551 dkim_exim_verify_log_all();
3553 #endif /* DISABLE_DKIM */
3555 #ifdef WITH_CONTENT_SCAN
3556 if ( recipients_count > 0
3558 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3561 #endif /* WITH_CONTENT_SCAN */
3563 #ifdef SUPPORT_DMARC
3564 dmarc_store_data(from_header);
3567 #ifndef DISABLE_PRDR
3568 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3571 int all_fail = FAIL;
3573 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3574 /* Loop through recipients, responses must be in same order received */
3575 for (unsigned int c = 0; recipients_count > c; c++)
3577 uschar * addr= recipients_list[c].address;
3578 uschar * msg= US"PRDR R=<%s> %s";
3581 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3582 addr, c+1, recipients_count);
3583 rc = acl_check(ACL_WHERE_PRDR, addr,
3584 acl_smtp_data_prdr, &user_msg, &log_msg);
3586 /* If any recipient rejected content, indicate it in final message */
3588 /* If all recipients rejected, indicate in final message */
3593 case OK: case DISCARD: code = US"250"; break;
3594 case DEFER: code = US"450"; break;
3595 default: code = US"550"; break;
3597 if (user_msg != NULL)
3598 smtp_user_msg(code, user_msg);
3603 case OK: case DISCARD:
3604 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3606 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3608 msg = string_sprintf(CS msg, addr, "refusal"); break;
3610 smtp_user_msg(code, msg);
3612 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3613 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3614 else log_write(0, LOG_MAIN, "%s", CS msg);
3616 if (rc != OK) { receive_remove_recipient(addr); c--; }
3618 /* Set up final message, used if data acl gives OK */
3619 smtp_reply = string_sprintf("%s id=%s message %s",
3620 all_fail == FAIL ? US"550" : US"250",
3623 ? US"rejected for all recipients"
3626 : US"accepted for some recipients");
3627 if (recipients_count == 0)
3629 message_id[0] = 0; /* Indicate no message accepted */
3634 prdr_requested = FALSE;
3635 #endif /* !DISABLE_PRDR */
3637 /* Check the recipients count again, as the MIME ACL might have changed
3640 if (acl_smtp_data != NULL && recipients_count > 0)
3642 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3643 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3646 recipients_count = 0;
3647 blackholed_by = US"DATA ACL";
3649 blackhole_log_msg = string_sprintf(": %s", log_msg);
3650 cancel_cutthrough_connection(TRUE, US"data acl discard");
3654 Uunlink(spool_name);
3655 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3656 #ifdef WITH_CONTENT_SCAN
3659 #ifdef EXPERIMENTAL_DCC
3662 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3663 smtp_yield = FALSE; /* No more messages after dropped connection */
3664 smtp_reply = US""; /* Indicate reply already sent */
3665 message_id[0] = 0; /* Indicate no message accepted */
3666 goto TIDYUP; /* Skip to end of function */
3671 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3672 we cannot take different actions for permanent and temporary rejections. */
3677 #ifdef WITH_CONTENT_SCAN
3678 if ( acl_not_smtp_mime
3679 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3683 #endif /* WITH_CONTENT_SCAN */
3687 uschar *user_msg, *log_msg;
3688 f.authentication_local = TRUE;
3689 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3692 recipients_count = 0;
3693 blackholed_by = US"non-SMTP ACL";
3695 blackhole_log_msg = string_sprintf(": %s", log_msg);
3699 Uunlink(spool_name);
3700 #ifdef WITH_CONTENT_SCAN
3703 #ifdef EXPERIMENTAL_DCC
3706 /* The ACL can specify where rejections are to be logged, possibly
3707 nowhere. The default is main and reject logs. */
3709 if (log_reject_target)
3710 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3711 sender_address, log_msg);
3713 if (!user_msg) user_msg = US"local configuration problem";
3714 if (smtp_batched_input)
3715 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3716 /* Does not return */
3719 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3720 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3721 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3723 /* Does not return */
3726 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3730 /* The applicable ACLs have been run */
3732 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3733 if (f.queue_only_policy) queued_by = US"ACL";
3736 #ifdef WITH_CONTENT_SCAN
3740 #ifdef EXPERIMENTAL_DCC
3745 #ifdef HAVE_LOCAL_SCAN
3746 /* The final check on the message is to run the scan_local() function. The
3747 version supplied with Exim always accepts, but this is a hook for sysadmins to
3748 supply their own checking code. The local_scan() function is run even when all
3749 the recipients have been discarded. */
3751 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3753 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3754 deleted, and the incident gets logged. */
3756 if (sigsetjmp(local_scan_env, 1) == 0)
3758 had_local_scan_crash = 0;
3759 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3760 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3761 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3762 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3764 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3765 local_scan_timeout);
3766 local_scan_data = NULL;
3768 had_local_scan_timeout = 0;
3769 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3770 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3771 rc = local_scan(data_fd, &local_scan_data);
3773 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3775 f.enable_dollar_recipients = FALSE;
3777 store_pool = POOL_MAIN; /* In case changed */
3778 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3781 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3782 os_non_restarting_signal(SIGFPE, SIG_DFL);
3783 os_non_restarting_signal(SIGILL, SIG_DFL);
3784 os_non_restarting_signal(SIGBUS, SIG_DFL);
3788 if (had_local_scan_crash)
3790 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3791 "signal %d - message temporarily rejected (size %d)",
3792 had_local_scan_crash, message_size);
3793 receive_bomb_out(US"local-scan-error", US"local verification problem");
3794 /* Does not return */
3796 if (had_local_scan_timeout)
3798 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3799 "message temporarily rejected (size %d)", message_size);
3800 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3801 /* Does not return */
3805 /* The length check is paranoia against some runaway code, and also because
3806 (for a success return) lines in the spool file are read into big_buffer. */
3808 if (local_scan_data)
3810 int len = Ustrlen(local_scan_data);
3811 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3812 local_scan_data = string_copyn(local_scan_data, len);
3815 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3817 if (!f.deliver_freeze) /* ACL might have already frozen */
3819 f.deliver_freeze = TRUE;
3820 deliver_frozen_at = time(NULL);
3821 frozen_by = US"local_scan()";
3823 rc = LOCAL_SCAN_ACCEPT;
3825 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3827 if (!f.queue_only_policy) /* ACL might have already queued */
3829 f.queue_only_policy = TRUE;
3830 queued_by = US"local_scan()";
3832 rc = LOCAL_SCAN_ACCEPT;
3835 /* Message accepted: remove newlines in local_scan_data because otherwise
3836 the spool file gets corrupted. Ensure that all recipients are qualified. */
3838 if (rc == LOCAL_SCAN_ACCEPT)
3840 if (local_scan_data)
3841 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3842 for (int i = 0; i < recipients_count; i++)
3844 recipient_item *r = recipients_list + i;
3845 r->address = rewrite_address_qualify(r->address, TRUE);
3847 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3849 if (recipients_count == 0 && !blackholed_by)
3850 blackholed_by = US"local_scan";
3853 /* Message rejected: newlines permitted in local_scan_data to generate
3854 multiline SMTP responses. */
3858 uschar *istemp = US"";
3862 errmsg = local_scan_data;
3864 Uunlink(spool_name); /* Cancel this message */
3868 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3869 "rejection given", rc);
3872 case LOCAL_SCAN_REJECT_NOLOGHDR:
3873 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3876 case LOCAL_SCAN_REJECT:
3877 smtp_code = US"550";
3878 if (!errmsg) errmsg = US"Administrative prohibition";
3881 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3882 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3885 case LOCAL_SCAN_TEMPREJECT:
3887 smtp_code = US"451";
3888 if (!errmsg) errmsg = US"Temporary local problem";
3889 istemp = US"temporarily ";
3893 g = string_append(NULL, 2, US"F=",
3894 sender_address[0] == 0 ? US"<>" : sender_address);
3895 g = add_host_info_for_log(g);
3897 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3898 string_from_gstring(g), istemp, string_printing(errmsg));
3901 if (!smtp_batched_input)
3903 smtp_respond(smtp_code, 3, TRUE, errmsg);
3904 message_id[0] = 0; /* Indicate no message accepted */
3905 smtp_reply = US""; /* Indicate reply already sent */
3906 goto TIDYUP; /* Skip to end of function */
3909 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3910 /* Does not return */
3913 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3914 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3915 US"message rejected by local scan code: ", error_rc, spool_data_file,
3917 /* Does not return */
3921 /* Reset signal handlers to ignore signals that previously would have caused
3922 the message to be abandoned. */
3924 signal(SIGTERM, SIG_IGN);
3925 signal(SIGINT, SIG_IGN);
3926 #endif /* HAVE_LOCAL_SCAN */
3929 /* Ensure the first time flag is set in the newly-received message. */
3931 f.deliver_firsttime = TRUE;
3933 #ifdef EXPERIMENTAL_BRIGHTMAIL
3935 { /* rewind data file */
3936 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3937 bmi_verdicts = bmi_process_message(header_list, data_fd);
3941 /* Update the timestamp in our Received: header to account for any time taken by
3942 an ACL or by local_scan(). The new time is the time that all reception
3943 processing is complete. */
3945 timestamp = expand_string(US"${tod_full}");
3946 tslen = Ustrlen(timestamp);
3948 memcpy(received_header->text + received_header->slen - tslen - 1,
3951 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3955 f.deliver_freeze = FALSE;
3956 f.queue_only_policy = FALSE;
3959 /* Keep the data file open until we have written the header file, in order to
3960 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3961 don't write the header file, and we unlink the data file. If writing the header
3962 file fails, we have failed to accept this message. */
3964 if (host_checking || blackholed_by)
3966 Uunlink(spool_name);
3967 msg_size = 0; /* Compute size for log line */
3968 for (header_line * h = header_list; h; h = h->next)
3969 if (h->type != '*') msg_size += h->slen;
3972 /* Write the -H file */
3975 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3977 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3978 Uunlink(spool_name); /* Lose the data file */
3982 smtp_reply = US"451 Error in writing spool file";
3983 message_id[0] = 0; /* Indicate no message accepted */
3988 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3989 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3991 /* Does not return */
3996 /* The message has now been successfully received. */
3998 receive_messagecount++;
4000 /* Add data size to written header size. We do not count the initial file name
4001 that is in the file, but we do add one extra for the notional blank line that
4002 precedes the data. This total differs from message_size in that it include the
4003 added Received: header and any other headers that got created locally. */
4005 if (fflush(spool_data_file))
4007 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
4008 log_write(0, LOG_MAIN, "%s\n", errmsg);
4009 Uunlink(spool_name); /* Lose the data file */
4013 smtp_reply = US"451 Error in writing spool file";
4014 message_id[0] = 0; /* Indicate no message accepted */
4019 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
4020 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4022 /* Does not return */
4025 fstat(data_fd, &statbuf);
4027 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
4029 /* Generate a "message received" log entry. We do this by building up a dynamic
4030 string as required. We log the arrival of a new message while the
4031 file is still locked, just in case the machine is *really* fast, and delivers
4032 it first! Include any message id that is in the message - since the syntax of a
4033 message id is actually an addr-spec, we can use the parse routine to canonicalize
4036 rcvd_log_reset_point = store_mark();
4037 g = string_get(256);
4039 g = string_append(g, 2,
4040 fake_response == FAIL ? US"(= " : US"<= ",
4041 sender_address[0] == 0 ? US"<>" : sender_address);
4042 if (message_reference)
4043 g = string_append(g, 2, US" R=", message_reference);
4045 g = add_host_info_for_log(g);
4048 if (LOGGING(tls_cipher) && tls_in.cipher)
4050 g = string_append(g, 2, US" X=", tls_in.cipher);
4051 # ifndef DISABLE_TLS_RESUME
4052 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4053 g = string_catn(g, US"*", 1);
4056 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4057 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4058 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4059 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4060 if (LOGGING(tls_sni) && tls_in.sni)
4061 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4064 if (sender_host_authenticated)
4066 g = string_append(g, 2, US" A=", sender_host_authenticated);
4067 if (authenticated_id)
4069 g = string_append(g, 2, US":", authenticated_id);
4070 if (LOGGING(smtp_mailauth) && authenticated_sender)
4071 g = string_append(g, 2, US":", authenticated_sender);
4075 #ifndef DISABLE_PRDR
4077 g = string_catn(g, US" PRDR", 5);
4080 #ifdef SUPPORT_PROXY
4081 if (proxy_session && LOGGING(proxy))
4082 g = string_append(g, 2, US" PRX=", proxy_local_address);
4085 if (chunking_state > CHUNKING_OFFERED)
4086 g = string_catn(g, US" K", 2);
4088 g = string_fmt_append(g, " S=%d", msg_size);
4090 /* log 8BITMIME mode announced in MAIL_FROM
4094 if (LOGGING(8bitmime))
4095 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4097 #ifndef DISABLE_DKIM
4098 if (LOGGING(dkim) && dkim_verify_overall)
4099 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4100 # ifdef EXPERIMENTAL_ARC
4101 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4102 g = string_catn(g, US" ARC", 4);
4106 if (LOGGING(receive_time))
4108 struct timeval diff = received_time_complete;
4109 timediff(&diff, &received_time);
4110 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4114 g = string_append(g, 2, US" Q=", queue_name);
4116 /* If an addr-spec in a message-id contains a quoted string, it can contain
4117 any characters except " \ and CR and so in particular it can contain NL!
4118 Therefore, make sure we use a printing-characters only version for the log.
4119 Also, allow for domain literals in the message id. */
4121 if ( LOGGING(msg_id) && msgid_header
4122 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4126 BOOL save_allow_domain_literals = allow_domain_literals;
4127 allow_domain_literals = TRUE;
4128 int start, end, domain;
4130 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4131 &errmsg, &start, &end, &domain, FALSE);
4132 allow_domain_literals = save_allow_domain_literals;
4134 g = string_append(g, 2,
4135 msgid_header_newly_created ? US" id*=" : US" id=",
4136 string_printing(old_id));
4139 /* If subject logging is turned on, create suitable printing-character
4140 text. By expanding $h_subject: we make use of the MIME decoding. */
4142 if (LOGGING(subject) && subject_header)
4144 uschar *p = big_buffer;
4145 uschar *ss = expand_string(US"$h_subject:");
4147 /* Backslash-quote any double quotes or backslashes so as to make a
4148 a C-like string, and turn any non-printers into escape sequences. */
4151 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4153 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4158 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4161 /* Terminate the string: string_cat() and string_append() leave room, but do
4162 not put the zero in. */
4164 (void) string_from_gstring(g);
4166 /* Create a message log file if message logs are being used and this message is
4167 not blackholed. Write the reception stuff to it. We used to leave message log
4168 creation until the first delivery, but this has proved confusing for some
4171 if (message_logs && !blackholed_by)
4174 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4176 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4180 (void)directory_make(spool_directory,
4181 spool_sname(US"msglog", message_subdir),
4182 MSGLOG_DIRECTORY_MODE, TRUE);
4183 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4187 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4188 m_name, strerror(errno));
4191 FILE *message_log = fdopen(fd, "a");
4194 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4195 m_name, strerror(errno));
4200 uschar *now = tod_stamp(tod_log);
4201 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4202 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4204 if (f.queue_only_policy) fprintf(message_log,
4205 "%s no immediate delivery: queued%s%s by %s\n", now,
4206 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4208 (void)fclose(message_log);
4213 /* Everything has now been done for a successful message except logging its
4214 arrival, and outputting an SMTP response. While writing to the log, set a flag
4215 to cause a call to receive_bomb_out() if the log cannot be opened. */
4217 f.receive_call_bombout = TRUE;
4219 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4220 connection has gone away. This can only be done if there is no unconsumed input
4221 waiting in the local input buffer. We can test for this by calling
4222 receive_hasc(). RFC 2920 (pipelining) explicitly allows for additional
4223 input to be sent following the final dot, so the presence of following input is
4226 If the connection is still present, but there is no unread input for the
4227 socket, the result of a select() call will be zero. If, however, the connection
4228 has gone away, or if there is pending input, the result of select() will be
4229 non-zero. The two cases can be distinguished by trying to read the next input
4230 character. If we succeed, we can unread it so that it remains in the local
4231 buffer for handling later. If not, the connection has been lost.
4233 Of course, since TCP/IP is asynchronous, there is always a chance that the
4234 connection will vanish between the time of this test and the sending of the
4235 response, but the chance of this happening should be small. */
4237 if ( smtp_input && sender_host_address && !f.sender_host_notsocket
4240 if (poll_one_fd(fileno(smtp_in), POLLIN, 0) != 0)
4242 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4243 if (c != EOF) (receive_ungetc)(c); else
4245 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4246 smtp_reply = US""; /* No attempt to send a response */
4247 smtp_yield = FALSE; /* Nothing more on this connection */
4249 /* Re-use the log line workspace */
4252 g = string_cat(g, US"SMTP connection lost after final dot");
4253 g = add_host_info_for_log(g);
4254 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4256 /* Delete the files for this aborted message. */
4258 Uunlink(spool_name);
4259 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4260 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4267 /* The connection has not gone away; we really are going to take responsibility
4268 for this message. */
4270 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4273 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4274 the sender's dot (below).
4275 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4276 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4277 in which case pass temp-reject back to initiator and dump the files.
4279 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4281 XXX We do not handle queue-only, freezing, or blackholes.
4283 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4285 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4286 /* Logging was done in finaldot() */
4289 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4290 cutthrough_done = ACCEPTED;
4291 break; /* message_id needed for SMTP accept below */
4293 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4294 ... for which, pass back the exact error */
4295 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4296 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4297 break; /* message_id needed for SMTP accept below */
4299 default: /* Unknown response, or error. Treat as temp-reject. */
4300 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4301 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4302 break; /* message_id needed for SMTP accept below */
4304 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4305 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4306 cutthrough_done = PERM_REJ;
4311 #ifndef DISABLE_PRDR
4312 if(!smtp_reply || prdr_requested)
4317 log_write(0, LOG_MAIN |
4318 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4319 (LOGGING(received_sender) ? LOG_SENDER : 0),
4322 /* Log any control actions taken by an ACL or local_scan(). */
4324 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4325 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4326 "no immediate delivery: queued%s%s by %s",
4327 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4330 f.receive_call_bombout = FALSE;
4332 /* The store for the main log message can be reused */
4333 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4335 /* If the message is frozen, and freeze_tell is set, do the telling. */
4337 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4338 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4339 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4340 message_id, frozen_by, sender_address);
4343 /* Either a message has been successfully received and written to the two spool
4344 files, or an error in writing the spool has occurred for an SMTP message, or
4345 an SMTP message has been rejected for policy reasons, or a message was passed on
4346 by cutthrough delivery. (For a non-SMTP message we will have already given up
4347 because there's no point in carrying on!) For non-cutthrough we must now close
4348 (and thereby unlock) the data file. In the successful case, this leaves the
4349 message on the spool, ready for delivery. In the error case, the spool file will
4350 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4353 For cutthrough we hold the data file locked until we have deleted it, otherwise
4354 a queue-runner could grab it in the window.
4356 A fflush() was done earlier in the expectation that any write errors on the
4357 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4358 possible for fclose() to fail - but what to do? What has happened to the lock
4359 if this happens? We can at least log it; if it is observed on some platform
4360 then we can think about properly declaring the message not-received. */
4364 process_info[process_info_len] = 0; /* Remove message id */
4365 if (spool_data_file && cutthrough_done == NOT_TRIED)
4367 if (fclose(spool_data_file)) /* Frees the lock */
4368 log_write(0, LOG_MAIN|LOG_PANIC,
4369 "spoolfile error on close: %s", strerror(errno));
4370 spool_data_file = NULL;
4373 /* Now reset signal handlers to their defaults */
4375 signal(SIGTERM, SIG_DFL);
4376 signal(SIGINT, SIG_DFL);
4378 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4379 value, which defaults TRUE - meaning there may be more incoming messages from
4380 this connection. For non-SMTP callers (where there is only ever one message),
4381 the default is FALSE. */
4387 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4388 is set to the response that should be sent. When it is NULL, we generate
4389 default responses. After an ACL error or local_scan() error, the response has
4390 already been sent, and smtp_reply is an empty string to indicate this. */
4392 if (!smtp_batched_input)
4396 if (fake_response != OK)
4397 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4398 3, TRUE, fake_response_text);
4400 /* An OK response is required; use "message" text if present. */
4404 uschar *code = US"250";
4406 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4407 smtp_respond(code, len, TRUE, user_msg);
4410 /* Default OK response */
4412 else if (chunking_state > CHUNKING_OFFERED)
4414 /* If there is more input waiting, no need to flush (probably the client
4415 pipelined QUIT after data). We check only the in-process buffer, not
4418 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4420 chunking_datasize, message_size+message_linecount, message_id);
4421 chunking_state = CHUNKING_OFFERED;
4424 smtp_printf("250 OK id=%s\r\n", receive_hasc(), message_id);
4428 "\n**** SMTP testing: that is not a real message id!\n\n");
4431 /* smtp_reply is set non-empty */
4433 else if (smtp_reply[0] != 0)
4434 if (fake_response != OK && smtp_reply[0] == '2')
4435 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4436 fake_response_text);
4438 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4440 switch (cutthrough_done)
4443 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4445 /* Delete spool files */
4446 Uunlink(spool_name);
4447 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4448 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4452 if (cutthrough.defer_pass)
4454 Uunlink(spool_name);
4455 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4456 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4461 if (cutthrough_done != NOT_TRIED)
4463 if (spool_data_file)
4465 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4466 spool_data_file = NULL;
4468 message_id[0] = 0; /* Prevent a delivery from starting */
4469 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4470 cutthrough.defer_pass = FALSE;
4474 /* For batched SMTP, generate an error message on failure, and do
4475 nothing on success. The function moan_smtp_batch() does not return -
4476 it exits from the program with a non-zero return code. */
4478 else if (smtp_reply)
4479 moan_smtp_batch(NULL, "%s", smtp_reply);
4483 /* If blackholing, we can immediately log this message's sad fate. The data
4484 file has already been unlinked, and the header file was never written to disk.
4485 We must now indicate that nothing was received, to prevent a delivery from
4490 const uschar *detail =
4491 #ifdef HAVE_LOCAL_SCAN
4492 local_scan_data ? string_printing(local_scan_data) :
4494 string_sprintf("(%s discarded recipients)", blackholed_by);
4495 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4496 log_write(0, LOG_MAIN, "Completed");
4500 /* Reset headers so that logging of rejects for a subsequent message doesn't
4501 include them. It is also important to set header_last = NULL before exiting
4502 from this function, as this prevents certain rewrites that might happen during
4503 subsequent verifying (of another incoming message) from trying to add headers
4504 when they shouldn't. */
4506 header_list = header_last = NULL;
4508 return yield; /* TRUE if more messages (SMTP only) */
4511 /* End of receive.c */