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). */
2838 for (int i = 0; i < recipients_count; i++)
2839 recipients_list[i].address = /* deconst ok as src was not cont */
2840 US rewrite_address(recipients_list[i].address, TRUE, TRUE,
2841 global_rewrite_rules, rewrite_existflags);
2843 /* If there is no From: header, generate one for local (without
2844 suppress_local_fixups) or submission_mode messages. If there is no sender
2845 address, but the sender is local or this is a local delivery error, use the
2846 originator login. This shouldn't happen for genuine bounces, but might happen
2847 for autoreplies. The addition of From: must be done *before* checking for the
2848 possible addition of a Sender: header, because untrusted_set_sender allows an
2849 untrusted user to set anything in the envelope (which might then get info
2850 From:) but we still want to ensure a valid Sender: if it is required. */
2853 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2855 const uschar * oname = US"";
2857 /* Use the originator_name if this is a locally submitted message and the
2858 caller is not trusted. For trusted callers, use it only if -F was used to
2859 force its value or if we have a non-SMTP message for which -f was not used
2860 to set the sender. */
2862 if (!sender_host_address)
2864 if (!f.trusted_caller || f.sender_name_forced ||
2865 (!smtp_input && !f.sender_address_forced))
2866 oname = originator_name;
2869 /* For non-locally submitted messages, the only time we use the originator
2870 name is when it was forced by the /name= option on control=submission. */
2872 else if (submission_name) oname = submission_name;
2874 /* Envelope sender is empty */
2876 if (!*sender_address)
2878 uschar *fromstart, *fromend;
2880 fromstart = string_sprintf("%sFrom: %s%s",
2881 resent_prefix, oname, *oname ? " <" : "");
2882 fromend = *oname ? US">" : US"";
2884 if (f.sender_local || f.local_error_message)
2885 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2886 local_part_quote(originator_login), qualify_domain_sender,
2889 else if (f.submission_mode && authenticated_id)
2891 if (!submission_domain)
2892 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2893 local_part_quote(authenticated_id), qualify_domain_sender,
2896 else if (!*submission_domain) /* empty => whole address set */
2897 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2901 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2902 local_part_quote(authenticated_id), submission_domain, fromend);
2904 from_header = header_last; /* To get it checked for Sender: */
2908 /* There is a non-null envelope sender. Build the header using the original
2909 sender address, before any rewriting that might have been done while
2914 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2917 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2920 from_header = header_last; /* To get it checked for Sender: */
2925 /* If the sender is local (without suppress_local_fixups), or if we are in
2926 submission mode and there is an authenticated_id, check that an existing From:
2927 is correct, and if not, generate a Sender: header, unless disabled. Any
2928 previously-existing Sender: header was removed above. Note that sender_local,
2929 as well as being TRUE if the caller of exim is not trusted, is also true if a
2930 trusted caller did not supply a -f argument for non-smtp input. To allow
2931 trusted callers to forge From: without supplying -f, we have to test explicitly
2932 here. If the From: header contains more than one address, then the call to
2933 parse_extract_address fails, and a Sender: header is inserted, as required. */
2936 && ( f.active_local_from_check
2937 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2938 || f.submission_mode && authenticated_id
2941 BOOL make_sender = TRUE;
2942 int start, end, domain;
2944 uschar *from_address =
2945 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2946 &start, &end, &domain, FALSE);
2947 uschar *generated_sender_address;
2949 generated_sender_address = f.submission_mode
2950 ? !submission_domain
2951 ? string_sprintf("%s@%s",
2952 local_part_quote(authenticated_id), qualify_domain_sender)
2953 : !*submission_domain /* empty => full address */
2954 ? string_sprintf("%s", authenticated_id)
2955 : string_sprintf("%s@%s",
2956 local_part_quote(authenticated_id), submission_domain)
2957 : string_sprintf("%s@%s",
2958 local_part_quote(originator_login), qualify_domain_sender);
2960 /* Remove permitted prefixes and suffixes from the local part of the From:
2961 address before doing the comparison with the generated sender. */
2966 uschar *at = domain ? from_address + domain - 1 : NULL;
2969 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2970 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2972 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2973 from_address += slen;
2977 if ( strcmpic(generated_sender_address, from_address) == 0
2978 || (!domain && strcmpic(from_address, originator_login) == 0))
2979 make_sender = FALSE;
2982 /* We have to cause the Sender header to be rewritten if there are
2983 appropriate rewriting rules. */
2986 if (f.submission_mode && !submission_name)
2987 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2988 generated_sender_address);
2990 header_add(htype_sender, "%sSender: %s <%s>\n",
2992 f.submission_mode ? submission_name : originator_name,
2993 generated_sender_address);
2995 /* Ensure that a non-null envelope sender address corresponds to the
2996 submission mode sender address. */
2998 if (f.submission_mode && *sender_address)
3000 if (!sender_address_unrewritten)
3001 sender_address_unrewritten = sender_address;
3002 sender_address = generated_sender_address;
3003 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
3004 log_write(L_address_rewrite, LOG_MAIN,
3005 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
3006 sender_address_unrewritten, generated_sender_address);
3010 /* If there are any rewriting rules, apply them to the sender address, unless
3011 it has already been rewritten as part of verification for SMTP input. */
3013 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
3015 /* deconst ok as src was not const */
3016 sender_address = US rewrite_address(sender_address, FALSE, TRUE,
3017 global_rewrite_rules, rewrite_existflags);
3018 DEBUG(D_receive|D_rewrite)
3019 debug_printf("rewritten sender = %s\n", sender_address);
3023 /* The headers must be run through rewrite_header(), because it ensures that
3024 addresses are fully qualified, as well as applying any rewriting rules that may
3027 Qualification of header addresses in a message from a remote host happens only
3028 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
3029 appropriate. For local messages, qualification always happens, unless -bnq is
3030 used to explicitly suppress it. No rewriting is done for an unqualified address
3031 that is left untouched.
3033 We start at the second header, skipping our own Received:. This rewriting is
3034 documented as happening *after* recipient addresses are taken from the headers
3035 by the -t command line option. An added Sender: gets rewritten here. */
3037 for (header_line * h = header_list->next; h; h = h->next)
3039 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
3040 rewrite_existflags, TRUE);
3045 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
3046 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
3047 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
3048 exists, this applies to the set of resent- headers rather than the normal set.
3050 The requirement for a recipient header has been removed in RFC 2822. At this
3051 point in the code, earlier versions of Exim added a To: header for locally
3052 submitted messages, and an empty Bcc: header for others. In the light of the
3053 changes in RFC 2822, this was dropped in November 2003. */
3056 /* If there is no date header, generate one if the message originates locally
3057 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3058 submission mode flag is set. Messages without Date: are not valid, but it seems
3059 to be more confusing if Exim adds one to all remotely-originated messages.
3060 As per Message-Id, we prepend if resending, else append.
3063 if ( !date_header_exists
3064 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3065 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3066 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3068 search_tidyup(); /* Free any cached resources */
3070 /* Show the complete set of headers if debugging. Note that the first one (the
3071 new Received:) has not yet been set. */
3075 debug_printf(">>Headers after rewriting and local additions:\n");
3076 for (header_line * h = header_list->next; h; h = h->next)
3077 debug_printf("%c %s", h->type, h->text);
3081 /* The headers are now complete in store. If we are running in filter
3082 testing mode, that is all this function does. Return TRUE if the message
3083 ended with a dot. */
3085 if (filter_test != FTEST_NONE)
3087 process_info[process_info_len] = 0;
3088 return message_ended == END_DOT;
3091 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3092 think more if it could be handled. Cannot do onward CHUNKING unless
3093 inbound is, but inbound chunking ought to be ok with outbound plain.
3094 Could we do onward CHUNKING given inbound CHUNKING?
3096 if (chunking_state > CHUNKING_OFFERED)
3097 cancel_cutthrough_connection(FALSE, US"chunking active");
3099 /* Cutthrough delivery:
3100 We have to create the Received header now rather than at the end of reception,
3101 so the timestamp behaviour is a change to the normal case.
3102 Having created it, send the headers to the destination. */
3104 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3106 if (received_count > received_headers_max)
3108 cancel_cutthrough_connection(TRUE, US"too many headers");
3109 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3110 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3111 "Too many \"Received\" headers",
3113 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3114 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3115 message_id[0] = 0; /* Indicate no message accepted */
3116 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3117 goto TIDYUP; /* Skip to end of function */
3119 received_header_gen();
3120 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3121 (void) cutthrough_headers_send();
3125 /* Open a new spool file for the data portion of the message. We need
3126 to access it both via a file descriptor and a stream. Try to make the
3127 directory if it isn't there. */
3129 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3130 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3132 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3134 if (errno == ENOENT)
3136 (void) directory_make(spool_directory,
3137 spool_sname(US"input", message_subdir),
3138 INPUT_DIRECTORY_MODE, TRUE);
3139 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3142 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3143 spool_name, strerror(errno));
3146 /* Make sure the file's group is the Exim gid, and double-check the mode
3147 because the group setting doesn't always get set automatically. */
3149 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3150 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3151 "Failed setting ownership on spool file %s: %s",
3152 spool_name, strerror(errno));
3153 (void)fchmod(data_fd, SPOOL_MODE);
3155 /* We now have data file open. Build a stream for it and lock it. We lock only
3156 the first line of the file (containing the message ID) because otherwise there
3157 are problems when Exim is run under Cygwin (I'm told). See comments in
3158 spool_in.c, where the same locking is done. */
3160 spool_data_file = fdopen(data_fd, "w+");
3161 lock_data.l_type = F_WRLCK;
3162 lock_data.l_whence = SEEK_SET;
3163 lock_data.l_start = 0;
3164 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3166 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3167 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3168 errno, strerror(errno));
3170 /* We have an open, locked data file. Write the message id to it to make it
3171 self-identifying. Then read the remainder of the input of this message and
3172 write it to the data file. If the variable next != NULL, it contains the first
3173 data line (which was read as a header but then turned out not to have the right
3174 format); write it (remembering that it might contain binary zeros). The result
3175 of fwrite() isn't inspected; instead we call ferror() below. */
3177 fprintf(spool_data_file, "%s-D\n", message_id);
3180 uschar *s = next->text;
3181 int len = next->slen;
3182 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3183 body_linecount++; /* Assumes only 1 line */
3186 /* Note that we might already be at end of file, or the logical end of file
3187 (indicated by '.'), or might have encountered an error while writing the
3188 message id or "next" line. */
3190 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3194 message_ended = chunking_state <= CHUNKING_OFFERED
3195 ? read_message_data_smtp(spool_data_file)
3197 ? read_message_bdat_smtp_wire(spool_data_file)
3198 : read_message_bdat_smtp(spool_data_file);
3199 receive_linecount++; /* The terminating "." line */
3202 message_ended = read_message_data(spool_data_file);
3204 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3205 message_linecount += body_linecount;
3207 switch (message_ended)
3209 /* Handle premature termination of SMTP */
3214 Uunlink(spool_name); /* Lose data file when closed */
3215 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3216 message_id[0] = 0; /* Indicate no message accepted */
3217 smtp_reply = handle_lost_connection(US"");
3219 goto TIDYUP; /* Skip to end of function */
3223 /* Handle message that is too big. Don't use host_or_ident() in the log
3224 message; we want to see the ident value even for non-remote messages. */
3227 Uunlink(spool_name); /* Lose the data file when closed */
3228 cancel_cutthrough_connection(TRUE, US"mail too big");
3229 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3231 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3232 "message too big: read=%d max=%d",
3234 sender_fullhost ? " H=" : "",
3235 sender_fullhost ? sender_fullhost : US"",
3236 sender_ident ? " U=" : "",
3237 sender_ident ? sender_ident : US"",
3239 thismessage_size_limit);
3243 smtp_reply = US"552 Message size exceeds maximum permitted";
3244 message_id[0] = 0; /* Indicate no message accepted */
3245 goto TIDYUP; /* Skip to end of function */
3249 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3250 give_local_error(ERRMESS_TOOBIG,
3251 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3252 US"message rejected: ", error_rc, spool_data_file, header_list);
3253 /* Does not return */
3257 /* Handle bad BDAT protocol sequence */
3260 Uunlink(spool_name); /* Lose the data file when closed */
3261 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3262 smtp_reply = US""; /* Response already sent */
3263 message_id[0] = 0; /* Indicate no message accepted */
3264 goto TIDYUP; /* Skip to end of function */
3268 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3269 example, there may be some expansion in an ACL that uses a timer.) */
3271 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3273 /* The message body has now been read into the data file. Call fflush() to
3274 empty the buffers in C, and then call fsync() to get the data written out onto
3275 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3276 having to do this). If there was an I/O error on either input or output,
3277 attempt to send an error message, and unlink the spool file. For non-SMTP input
3278 we can then give up. Note that for SMTP input we must swallow the remainder of
3279 the input in cases of output errors, since the far end doesn't expect to see
3280 anything until the terminating dot line is sent. */
3282 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3283 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3285 uschar *msg_errno = US strerror(errno);
3286 BOOL input_error = (receive_ferror)() != 0;
3287 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3288 input_error? "Input read" : "Spool write",
3290 sender_fullhost ? sender_fullhost : sender_ident);
3292 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3293 Uunlink(spool_name); /* Lose the data file */
3294 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3299 smtp_reply = US"451 Error while reading input data";
3302 smtp_reply = US"451 Error while writing spool file";
3303 receive_swallow_smtp();
3305 message_id[0] = 0; /* Indicate no message accepted */
3306 goto TIDYUP; /* Skip to end of function */
3311 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3312 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3314 /* Does not return */
3319 /* No I/O errors were encountered while writing the data file. */
3321 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3322 gettimeofday(&received_time_complete, NULL);
3325 /* If there were any bad addresses extracted by -t, or there were no recipients
3326 left after -t, send a message to the sender of this message, or write it to
3327 stderr if the error handling option is set that way. Note that there may
3328 legitimately be no recipients for an SMTP message if they have all been removed
3331 We need to rewind the data file in order to read it. In the case of no
3332 recipients or stderr error writing, throw the data file away afterwards, and
3333 exit. (This can't be SMTP, which always ensures there's at least one
3334 syntactically good recipient address.) */
3336 if (extract_recip && (bad_addresses || recipients_count == 0))
3340 if (recipients_count == 0) debug_printf("*** No recipients\n");
3343 debug_printf("*** Bad address(es)\n");
3344 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3345 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3349 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3350 message_id, bad_addresses ? "bad addresses" : "no recipients");
3352 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3354 /* If configured to send errors to the sender, but this fails, force
3355 a failure error code. We use a special one for no recipients so that it
3356 can be detected by the autoreply transport. Otherwise error_rc is set to
3357 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3358 it is EXIT_SUCCESS. */
3360 if (error_handling == ERRORS_SENDER)
3362 if (!moan_to_sender(
3364 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3365 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3366 bad_addresses, header_list, spool_data_file, FALSE
3368 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3373 if (extracted_ignored)
3374 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3376 fprintf(stderr, "exim: no recipients in message\n");
3379 fprintf(stderr, "exim: invalid address%s",
3380 bad_addresses->next ? "es:\n" : ":");
3381 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3382 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3383 bad_addresses->text2);
3387 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3389 Uunlink(spool_name);
3390 (void)fclose(spool_data_file);
3391 exim_exit(error_rc);
3395 /* Data file successfully written. Generate text for the Received: header by
3396 expanding the configured string, and adding a timestamp. By leaving this
3397 operation till now, we ensure that the timestamp is the time that message
3398 reception was completed. However, this is deliberately done before calling the
3399 data ACL and local_scan().
3401 This Received: header may therefore be inspected by the data ACL and by code in
3402 the local_scan() function. When they have run, we update the timestamp to be
3403 the final time of reception.
3405 If there is just one recipient, set up its value in the $received_for variable
3406 for use when we generate the Received: header.
3408 Note: the checking for too many Received: headers is handled by the delivery
3410 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3412 if (!received_header->text) /* Non-cutthrough case */
3414 received_header_gen();
3416 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3418 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3419 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3421 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3422 now, before running the DATA ACL. */
3424 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3427 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3428 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3430 /* If an ACL is specified for checking things at this stage of reception of a
3431 message, run it, unless all the recipients were removed by "discard" in earlier
3432 ACLs. That is the only case in which recipients_count can be zero at this
3433 stage. Set deliver_datafile to point to the data file so that $message_body and
3434 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3437 deliver_datafile = data_fd;
3440 f.enable_dollar_recipients = TRUE;
3442 if (recipients_count == 0)
3443 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3447 /* Handle interactive SMTP messages */
3449 if (smtp_input && !smtp_batched_input)
3452 #ifndef DISABLE_DKIM
3453 if (!f.dkim_disable_verify)
3455 /* Finish verification */
3456 dkim_exim_verify_finish();
3458 /* Check if we must run the DKIM ACL */
3459 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3461 uschar * dkim_verify_signers_expanded =
3462 expand_string(dkim_verify_signers);
3463 gstring * results = NULL;
3467 gstring * seen_items = NULL;
3468 int old_pool = store_pool;
3470 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3472 if (!(ptr = dkim_verify_signers_expanded))
3473 log_write(0, LOG_MAIN|LOG_PANIC,
3474 "expansion of dkim_verify_signers option failed: %s",
3475 expand_string_message);
3477 /* Default to OK when no items are present */
3479 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3481 /* Prevent running ACL for an empty item */
3482 if (!item || !*item) continue;
3484 /* Only run ACL once for each domain or identity,
3485 no matter how often it appears in the expanded list. */
3489 const uschar * seen_items_list = string_from_gstring(seen_items);
3491 BOOL seen_this_item = FALSE;
3493 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3495 if (Ustrcmp(seen_item,item) == 0)
3497 seen_this_item = TRUE;
3504 debug_printf("acl_smtp_dkim: skipping signer %s, "
3505 "already seen\n", item);
3509 seen_items = string_catn(seen_items, US":", 1);
3511 seen_items = string_cat(seen_items, item);
3513 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3517 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3518 "skipping remaining items\n", rc, item);
3519 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3523 dkim_verify_status = string_from_gstring(results);
3524 store_pool = old_pool;
3525 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3528 recipients_count = 0;
3529 blackholed_by = US"DKIM ACL";
3531 blackhole_log_msg = string_sprintf(": %s", log_msg);
3535 Uunlink(spool_name);
3536 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3537 smtp_yield = FALSE; /* No more messages after dropped connection */
3538 smtp_reply = US""; /* Indicate reply already sent */
3539 message_id[0] = 0; /* Indicate no message accepted */
3540 goto TIDYUP; /* Skip to end of function */
3544 dkim_exim_verify_log_all();
3546 #endif /* DISABLE_DKIM */
3548 #ifdef WITH_CONTENT_SCAN
3549 if ( recipients_count > 0
3551 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3554 #endif /* WITH_CONTENT_SCAN */
3556 #ifdef SUPPORT_DMARC
3557 dmarc_store_data(from_header);
3560 #ifndef DISABLE_PRDR
3561 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3564 int all_fail = FAIL;
3566 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3567 /* Loop through recipients, responses must be in same order received */
3568 for (unsigned int c = 0; recipients_count > c; c++)
3570 uschar * addr= recipients_list[c].address;
3571 uschar * msg= US"PRDR R=<%s> %s";
3574 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3575 addr, c+1, recipients_count);
3576 rc = acl_check(ACL_WHERE_PRDR, addr,
3577 acl_smtp_data_prdr, &user_msg, &log_msg);
3579 /* If any recipient rejected content, indicate it in final message */
3581 /* If all recipients rejected, indicate in final message */
3586 case OK: case DISCARD: code = US"250"; break;
3587 case DEFER: code = US"450"; break;
3588 default: code = US"550"; break;
3590 if (user_msg != NULL)
3591 smtp_user_msg(code, user_msg);
3596 case OK: case DISCARD:
3597 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3599 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3601 msg = string_sprintf(CS msg, addr, "refusal"); break;
3603 smtp_user_msg(code, msg);
3605 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3606 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3607 else log_write(0, LOG_MAIN, "%s", CS msg);
3609 if (rc != OK) { receive_remove_recipient(addr); c--; }
3611 /* Set up final message, used if data acl gives OK */
3612 smtp_reply = string_sprintf("%s id=%s message %s",
3613 all_fail == FAIL ? US"550" : US"250",
3616 ? US"rejected for all recipients"
3619 : US"accepted for some recipients");
3620 if (recipients_count == 0)
3622 message_id[0] = 0; /* Indicate no message accepted */
3627 prdr_requested = FALSE;
3628 #endif /* !DISABLE_PRDR */
3630 /* Check the recipients count again, as the MIME ACL might have changed
3633 if (acl_smtp_data != NULL && recipients_count > 0)
3635 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3636 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3639 recipients_count = 0;
3640 blackholed_by = US"DATA ACL";
3642 blackhole_log_msg = string_sprintf(": %s", log_msg);
3643 cancel_cutthrough_connection(TRUE, US"data acl discard");
3647 Uunlink(spool_name);
3648 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3649 #ifdef WITH_CONTENT_SCAN
3652 #ifdef EXPERIMENTAL_DCC
3655 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3656 smtp_yield = FALSE; /* No more messages after dropped connection */
3657 smtp_reply = US""; /* Indicate reply already sent */
3658 message_id[0] = 0; /* Indicate no message accepted */
3659 goto TIDYUP; /* Skip to end of function */
3664 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3665 we cannot take different actions for permanent and temporary rejections. */
3670 #ifdef WITH_CONTENT_SCAN
3671 if ( acl_not_smtp_mime
3672 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3676 #endif /* WITH_CONTENT_SCAN */
3680 uschar *user_msg, *log_msg;
3681 f.authentication_local = TRUE;
3682 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3685 recipients_count = 0;
3686 blackholed_by = US"non-SMTP ACL";
3688 blackhole_log_msg = string_sprintf(": %s", log_msg);
3692 Uunlink(spool_name);
3693 #ifdef WITH_CONTENT_SCAN
3696 #ifdef EXPERIMENTAL_DCC
3699 /* The ACL can specify where rejections are to be logged, possibly
3700 nowhere. The default is main and reject logs. */
3702 if (log_reject_target)
3703 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3704 sender_address, log_msg);
3706 if (!user_msg) user_msg = US"local configuration problem";
3707 if (smtp_batched_input)
3708 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3709 /* Does not return */
3712 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3713 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3714 US"message rejected by non-SMTP ACL: ", error_rc, spool_data_file,
3716 /* Does not return */
3719 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3723 /* The applicable ACLs have been run */
3725 if (f.deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3726 if (f.queue_only_policy) queued_by = US"ACL";
3729 #ifdef WITH_CONTENT_SCAN
3733 #ifdef EXPERIMENTAL_DCC
3738 #ifdef HAVE_LOCAL_SCAN
3739 /* The final check on the message is to run the scan_local() function. The
3740 version supplied with Exim always accepts, but this is a hook for sysadmins to
3741 supply their own checking code. The local_scan() function is run even when all
3742 the recipients have been discarded. */
3744 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3746 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3747 deleted, and the incident gets logged. */
3749 if (sigsetjmp(local_scan_env, 1) == 0)
3751 had_local_scan_crash = 0;
3752 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3753 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3754 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3755 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3757 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3758 local_scan_timeout);
3759 local_scan_data = NULL;
3761 had_local_scan_timeout = 0;
3762 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3763 if (local_scan_timeout > 0) ALARM(local_scan_timeout);
3764 rc = local_scan(data_fd, &local_scan_data);
3766 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3768 f.enable_dollar_recipients = FALSE;
3770 store_pool = POOL_MAIN; /* In case changed */
3771 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3774 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3775 os_non_restarting_signal(SIGFPE, SIG_DFL);
3776 os_non_restarting_signal(SIGILL, SIG_DFL);
3777 os_non_restarting_signal(SIGBUS, SIG_DFL);
3781 if (had_local_scan_crash)
3783 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3784 "signal %d - message temporarily rejected (size %d)",
3785 had_local_scan_crash, message_size);
3786 receive_bomb_out(US"local-scan-error", US"local verification problem");
3787 /* Does not return */
3789 if (had_local_scan_timeout)
3791 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3792 "message temporarily rejected (size %d)", message_size);
3793 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3794 /* Does not return */
3798 /* The length check is paranoia against some runaway code, and also because
3799 (for a success return) lines in the spool file are read into big_buffer. */
3801 if (local_scan_data)
3803 int len = Ustrlen(local_scan_data);
3804 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3805 local_scan_data = string_copyn(local_scan_data, len);
3808 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3810 if (!f.deliver_freeze) /* ACL might have already frozen */
3812 f.deliver_freeze = TRUE;
3813 deliver_frozen_at = time(NULL);
3814 frozen_by = US"local_scan()";
3816 rc = LOCAL_SCAN_ACCEPT;
3818 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3820 if (!f.queue_only_policy) /* ACL might have already queued */
3822 f.queue_only_policy = TRUE;
3823 queued_by = US"local_scan()";
3825 rc = LOCAL_SCAN_ACCEPT;
3828 /* Message accepted: remove newlines in local_scan_data because otherwise
3829 the spool file gets corrupted. Ensure that all recipients are qualified. */
3831 if (rc == LOCAL_SCAN_ACCEPT)
3833 if (local_scan_data)
3834 for (uschar * s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3835 for (int i = 0; i < recipients_count; i++)
3837 recipient_item *r = recipients_list + i;
3838 r->address = rewrite_address_qualify(r->address, TRUE);
3840 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3842 if (recipients_count == 0 && !blackholed_by)
3843 blackholed_by = US"local_scan";
3846 /* Message rejected: newlines permitted in local_scan_data to generate
3847 multiline SMTP responses. */
3851 uschar *istemp = US"";
3855 errmsg = local_scan_data;
3857 Uunlink(spool_name); /* Cancel this message */
3861 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3862 "rejection given", rc);
3865 case LOCAL_SCAN_REJECT_NOLOGHDR:
3866 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3869 case LOCAL_SCAN_REJECT:
3870 smtp_code = US"550";
3871 if (!errmsg) errmsg = US"Administrative prohibition";
3874 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3875 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3878 case LOCAL_SCAN_TEMPREJECT:
3880 smtp_code = US"451";
3881 if (!errmsg) errmsg = US"Temporary local problem";
3882 istemp = US"temporarily ";
3886 g = string_append(NULL, 2, US"F=",
3887 sender_address[0] == 0 ? US"<>" : sender_address);
3888 g = add_host_info_for_log(g);
3890 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3891 string_from_gstring(g), istemp, string_printing(errmsg));
3894 if (!smtp_batched_input)
3896 smtp_respond(smtp_code, 3, TRUE, errmsg);
3897 message_id[0] = 0; /* Indicate no message accepted */
3898 smtp_reply = US""; /* Indicate reply already sent */
3899 goto TIDYUP; /* Skip to end of function */
3902 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3903 /* Does not return */
3906 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3907 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3908 US"message rejected by local scan code: ", error_rc, spool_data_file,
3910 /* Does not return */
3914 /* Reset signal handlers to ignore signals that previously would have caused
3915 the message to be abandoned. */
3917 signal(SIGTERM, SIG_IGN);
3918 signal(SIGINT, SIG_IGN);
3919 #endif /* HAVE_LOCAL_SCAN */
3922 /* Ensure the first time flag is set in the newly-received message. */
3924 f.deliver_firsttime = TRUE;
3926 #ifdef EXPERIMENTAL_BRIGHTMAIL
3928 { /* rewind data file */
3929 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3930 bmi_verdicts = bmi_process_message(header_list, data_fd);
3934 /* Update the timestamp in our Received: header to account for any time taken by
3935 an ACL or by local_scan(). The new time is the time that all reception
3936 processing is complete. */
3938 timestamp = expand_string(US"${tod_full}");
3939 tslen = Ustrlen(timestamp);
3941 memcpy(received_header->text + received_header->slen - tslen - 1,
3944 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3948 f.deliver_freeze = FALSE;
3949 f.queue_only_policy = FALSE;
3952 /* Keep the data file open until we have written the header file, in order to
3953 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3954 don't write the header file, and we unlink the data file. If writing the header
3955 file fails, we have failed to accept this message. */
3957 if (host_checking || blackholed_by)
3959 Uunlink(spool_name);
3960 msg_size = 0; /* Compute size for log line */
3961 for (header_line * h = header_list; h; h = h->next)
3962 if (h->type != '*') msg_size += h->slen;
3965 /* Write the -H file */
3968 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3970 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3971 Uunlink(spool_name); /* Lose the data file */
3975 smtp_reply = US"451 Error in writing spool file";
3976 message_id[0] = 0; /* Indicate no message accepted */
3981 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3982 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
3984 /* Does not return */
3989 /* The message has now been successfully received. */
3991 receive_messagecount++;
3993 /* Add data size to written header size. We do not count the initial file name
3994 that is in the file, but we do add one extra for the notional blank line that
3995 precedes the data. This total differs from message_size in that it include the
3996 added Received: header and any other headers that got created locally. */
3998 if (fflush(spool_data_file))
4000 errmsg = string_sprintf("Spool write error: %s", strerror(errno));
4001 log_write(0, LOG_MAIN, "%s\n", errmsg);
4002 Uunlink(spool_name); /* Lose the data file */
4006 smtp_reply = US"451 Error in writing spool file";
4007 message_id[0] = 0; /* Indicate no message accepted */
4012 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
4013 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, spool_data_file,
4015 /* Does not return */
4018 fstat(data_fd, &statbuf);
4020 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
4022 /* Generate a "message received" log entry. We do this by building up a dynamic
4023 string as required. We log the arrival of a new message while the
4024 file is still locked, just in case the machine is *really* fast, and delivers
4025 it first! Include any message id that is in the message - since the syntax of a
4026 message id is actually an addr-spec, we can use the parse routine to canonicalize
4029 rcvd_log_reset_point = store_mark();
4030 g = string_get(256);
4032 g = string_append(g, 2,
4033 fake_response == FAIL ? US"(= " : US"<= ",
4034 sender_address[0] == 0 ? US"<>" : sender_address);
4035 if (message_reference)
4036 g = string_append(g, 2, US" R=", message_reference);
4038 g = add_host_info_for_log(g);
4041 if (LOGGING(tls_cipher) && tls_in.cipher)
4043 g = string_append(g, 2, US" X=", tls_in.cipher);
4044 # ifndef DISABLE_TLS_RESUME
4045 if (LOGGING(tls_resumption) && tls_in.resumption & RESUME_USED)
4046 g = string_catn(g, US"*", 1);
4049 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
4050 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
4051 if (LOGGING(tls_peerdn) && tls_in.peerdn)
4052 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
4053 if (LOGGING(tls_sni) && tls_in.sni)
4054 g = string_append(g, 2, US" SNI=", string_printing2(tls_in.sni, SP_TAB|SP_SPACE));
4057 if (sender_host_authenticated)
4059 g = string_append(g, 2, US" A=", sender_host_authenticated);
4060 if (authenticated_id)
4062 g = string_append(g, 2, US":", authenticated_id);
4063 if (LOGGING(smtp_mailauth) && authenticated_sender)
4064 g = string_append(g, 2, US":", authenticated_sender);
4068 #ifndef DISABLE_PRDR
4070 g = string_catn(g, US" PRDR", 5);
4073 #ifdef SUPPORT_PROXY
4074 if (proxy_session && LOGGING(proxy))
4075 g = string_append(g, 2, US" PRX=", proxy_local_address);
4078 if (chunking_state > CHUNKING_OFFERED)
4079 g = string_catn(g, US" K", 2);
4081 g = string_fmt_append(g, " S=%d", msg_size);
4083 /* log 8BITMIME mode announced in MAIL_FROM
4087 if (LOGGING(8bitmime))
4088 g = string_fmt_append(g, " M8S=%d", body_8bitmime);
4090 #ifndef DISABLE_DKIM
4091 if (LOGGING(dkim) && dkim_verify_overall)
4092 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
4093 # ifdef EXPERIMENTAL_ARC
4094 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
4095 g = string_catn(g, US" ARC", 4);
4099 if (LOGGING(receive_time))
4101 struct timeval diff = received_time_complete;
4102 timediff(&diff, &received_time);
4103 g = string_append(g, 2, US" RT=", string_timediff(&diff));
4107 g = string_append(g, 2, US" Q=", queue_name);
4109 /* If an addr-spec in a message-id contains a quoted string, it can contain
4110 any characters except " \ and CR and so in particular it can contain NL!
4111 Therefore, make sure we use a printing-characters only version for the log.
4112 Also, allow for domain literals in the message id. */
4114 if ( LOGGING(msg_id) && msgid_header
4115 && (LOGGING(msg_id_created) || !msgid_header_newly_created)
4119 BOOL save_allow_domain_literals = allow_domain_literals;
4120 allow_domain_literals = TRUE;
4121 int start, end, domain;
4123 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4124 &errmsg, &start, &end, &domain, FALSE);
4125 allow_domain_literals = save_allow_domain_literals;
4127 g = string_append(g, 2,
4128 msgid_header_newly_created ? US" id*=" : US" id=",
4129 string_printing(old_id));
4132 /* If subject logging is turned on, create suitable printing-character
4133 text. By expanding $h_subject: we make use of the MIME decoding. */
4135 if (LOGGING(subject) && subject_header)
4137 uschar *p = big_buffer;
4138 uschar *ss = expand_string(US"$h_subject:");
4140 /* Backslash-quote any double quotes or backslashes so as to make a
4141 a C-like string, and turn any non-printers into escape sequences. */
4144 if (*ss != 0) for (int i = 0; i < 100 && ss[i] != 0; i++)
4146 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4151 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4154 /* Terminate the string: string_cat() and string_append() leave room, but do
4155 not put the zero in. */
4157 (void) string_from_gstring(g);
4159 /* Create a message log file if message logs are being used and this message is
4160 not blackholed. Write the reception stuff to it. We used to leave message log
4161 creation until the first delivery, but this has proved confusing for some
4164 if (message_logs && !blackholed_by)
4167 uschar * m_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4169 if ( (fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4173 (void)directory_make(spool_directory,
4174 spool_sname(US"msglog", message_subdir),
4175 MSGLOG_DIRECTORY_MODE, TRUE);
4176 fd = Uopen(m_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4180 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4181 m_name, strerror(errno));
4184 FILE *message_log = fdopen(fd, "a");
4187 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4188 m_name, strerror(errno));
4193 uschar *now = tod_stamp(tod_log);
4194 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4195 if (f.deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4197 if (f.queue_only_policy) fprintf(message_log,
4198 "%s no immediate delivery: queued%s%s by %s\n", now,
4199 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4201 (void)fclose(message_log);
4206 /* Everything has now been done for a successful message except logging its
4207 arrival, and outputting an SMTP response. While writing to the log, set a flag
4208 to cause a call to receive_bomb_out() if the log cannot be opened. */
4210 f.receive_call_bombout = TRUE;
4212 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4213 connection has gone away. This can only be done if there is no unconsumed input
4214 waiting in the local input buffer. We can test for this by calling
4215 receive_hasc(). RFC 2920 (pipelining) explicitly allows for additional
4216 input to be sent following the final dot, so the presence of following input is
4219 If the connection is still present, but there is no unread input for the
4220 socket, the result of a select() call will be zero. If, however, the connection
4221 has gone away, or if there is pending input, the result of select() will be
4222 non-zero. The two cases can be distinguished by trying to read the next input
4223 character. If we succeed, we can unread it so that it remains in the local
4224 buffer for handling later. If not, the connection has been lost.
4226 Of course, since TCP/IP is asynchronous, there is always a chance that the
4227 connection will vanish between the time of this test and the sending of the
4228 response, but the chance of this happening should be small. */
4230 if ( smtp_input && sender_host_address && !f.sender_host_notsocket
4233 if (poll_one_fd(fileno(smtp_in), POLLIN, 0) != 0)
4235 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4236 if (c != EOF) (receive_ungetc)(c); else
4238 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4239 smtp_reply = US""; /* No attempt to send a response */
4240 smtp_yield = FALSE; /* Nothing more on this connection */
4242 /* Re-use the log line workspace */
4245 g = string_cat(g, US"SMTP connection lost after final dot");
4246 g = add_host_info_for_log(g);
4247 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4249 /* Delete the files for this aborted message. */
4251 Uunlink(spool_name);
4252 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4253 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4260 /* The connection has not gone away; we really are going to take responsibility
4261 for this message. */
4263 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4266 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4267 the sender's dot (below).
4268 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4269 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4270 in which case pass temp-reject back to initiator and dump the files.
4272 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4274 XXX We do not handle queue-only, freezing, or blackholes.
4276 if(cutthrough.cctx.sock >= 0 && cutthrough.delivery)
4278 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4279 /* Logging was done in finaldot() */
4282 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4283 cutthrough_done = ACCEPTED;
4284 break; /* message_id needed for SMTP accept below */
4286 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4287 ... for which, pass back the exact error */
4288 if (cutthrough.defer_pass) smtp_reply = string_copy_perm(msg, TRUE);
4289 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4290 break; /* message_id needed for SMTP accept below */
4292 default: /* Unknown response, or error. Treat as temp-reject. */
4293 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4294 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4295 break; /* message_id needed for SMTP accept below */
4297 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4298 smtp_reply = string_copy_perm(msg, TRUE); /* Pass on the exact error */
4299 cutthrough_done = PERM_REJ;
4304 #ifndef DISABLE_PRDR
4305 if(!smtp_reply || prdr_requested)
4310 log_write(0, LOG_MAIN |
4311 (LOGGING(received_recipients) ? LOG_RECIPIENTS : 0) |
4312 (LOGGING(received_sender) ? LOG_SENDER : 0),
4315 /* Log any control actions taken by an ACL or local_scan(). */
4317 if (f.deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4318 if (f.queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4319 "no immediate delivery: queued%s%s by %s",
4320 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4323 f.receive_call_bombout = FALSE;
4325 /* The store for the main log message can be reused */
4326 rcvd_log_reset_point = store_reset(rcvd_log_reset_point);
4328 /* If the message is frozen, and freeze_tell is set, do the telling. */
4330 if (f.deliver_freeze && freeze_tell && freeze_tell[0])
4331 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4332 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4333 message_id, frozen_by, sender_address);
4336 /* Either a message has been successfully received and written to the two spool
4337 files, or an error in writing the spool has occurred for an SMTP message, or
4338 an SMTP message has been rejected for policy reasons, or a message was passed on
4339 by cutthrough delivery. (For a non-SMTP message we will have already given up
4340 because there's no point in carrying on!) For non-cutthrough we must now close
4341 (and thereby unlock) the data file. In the successful case, this leaves the
4342 message on the spool, ready for delivery. In the error case, the spool file will
4343 be deleted. Then tidy up store, interact with an SMTP call if necessary, and
4346 For cutthrough we hold the data file locked until we have deleted it, otherwise
4347 a queue-runner could grab it in the window.
4349 A fflush() was done earlier in the expectation that any write errors on the
4350 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4351 possible for fclose() to fail - but what to do? What has happened to the lock
4352 if this happens? We can at least log it; if it is observed on some platform
4353 then we can think about properly declaring the message not-received. */
4357 process_info[process_info_len] = 0; /* Remove message id */
4358 if (spool_data_file && cutthrough_done == NOT_TRIED)
4360 if (fclose(spool_data_file)) /* Frees the lock */
4361 log_write(0, LOG_MAIN|LOG_PANIC,
4362 "spoolfile error on close: %s", strerror(errno));
4363 spool_data_file = NULL;
4366 /* Now reset signal handlers to their defaults */
4368 signal(SIGTERM, SIG_DFL);
4369 signal(SIGINT, SIG_DFL);
4371 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4372 value, which defaults TRUE - meaning there may be more incoming messages from
4373 this connection. For non-SMTP callers (where there is only ever one message),
4374 the default is FALSE. */
4380 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4381 is set to the response that should be sent. When it is NULL, we generate
4382 default responses. After an ACL error or local_scan() error, the response has
4383 already been sent, and smtp_reply is an empty string to indicate this. */
4385 if (!smtp_batched_input)
4389 if (fake_response != OK)
4390 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4391 3, TRUE, fake_response_text);
4393 /* An OK response is required; use "message" text if present. */
4397 uschar *code = US"250";
4399 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4400 smtp_respond(code, len, TRUE, user_msg);
4403 /* Default OK response */
4405 else if (chunking_state > CHUNKING_OFFERED)
4407 /* If there is more input waiting, no need to flush (probably the client
4408 pipelined QUIT after data). We check only the in-process buffer, not
4411 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4413 chunking_datasize, message_size+message_linecount, message_id);
4414 chunking_state = CHUNKING_OFFERED;
4417 smtp_printf("250 OK id=%s\r\n", receive_hasc(), message_id);
4421 "\n**** SMTP testing: that is not a real message id!\n\n");
4424 /* smtp_reply is set non-empty */
4426 else if (smtp_reply[0] != 0)
4427 if (fake_response != OK && smtp_reply[0] == '2')
4428 smtp_respond(fake_response == DEFER ? US"450" : US"550", 3, TRUE,
4429 fake_response_text);
4431 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4433 switch (cutthrough_done)
4436 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4438 /* Delete spool files */
4439 Uunlink(spool_name);
4440 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4441 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4445 if (cutthrough.defer_pass)
4447 Uunlink(spool_name);
4448 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4449 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4454 if (cutthrough_done != NOT_TRIED)
4456 if (spool_data_file)
4458 (void) fclose(spool_data_file); /* Frees the lock; do not care if error */
4459 spool_data_file = NULL;
4461 message_id[0] = 0; /* Prevent a delivery from starting */
4462 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4463 cutthrough.defer_pass = FALSE;
4467 /* For batched SMTP, generate an error message on failure, and do
4468 nothing on success. The function moan_smtp_batch() does not return -
4469 it exits from the program with a non-zero return code. */
4471 else if (smtp_reply)
4472 moan_smtp_batch(NULL, "%s", smtp_reply);
4476 /* If blackholing, we can immediately log this message's sad fate. The data
4477 file has already been unlinked, and the header file was never written to disk.
4478 We must now indicate that nothing was received, to prevent a delivery from
4483 const uschar *detail =
4484 #ifdef HAVE_LOCAL_SCAN
4485 local_scan_data ? string_printing(local_scan_data) :
4487 string_sprintf("(%s discarded recipients)", blackholed_by);
4488 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4489 log_write(0, LOG_MAIN, "Completed");
4493 /* Reset headers so that logging of rejects for a subsequent message doesn't
4494 include them. It is also important to set header_last = NULL before exiting
4495 from this function, as this prevents certain rewrites that might happen during
4496 subsequent verifying (of another incoming message) from trying to add headers
4497 when they shouldn't. */
4499 header_list = header_last = NULL;
4501 return yield; /* TRUE if more messages (SMTP only) */
4504 /* End of receive.c */