1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
13 #ifdef EXPERIMENTAL_DCC
17 #ifdef EXPERIMENTAL_DMARC
19 #endif /* EXPERIMENTAL_DMARC */
21 /*************************************************
22 * Local static variables *
23 *************************************************/
25 static FILE *data_file = NULL;
26 static int data_fd = -1;
27 static uschar *spool_name = US"";
29 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
31 jmp_buf local_scan_env; /* error-handling context for local_scan */
32 unsigned had_local_scan_crash;
33 unsigned had_local_scan_timeout;
36 /*************************************************
37 * Non-SMTP character reading functions *
38 *************************************************/
40 /* These are the default functions that are set up in the variables such as
41 receive_getc initially. They just call the standard functions, passing stdin as
42 the file. (When SMTP input is occurring, different functions are used by
43 changing the pointer variables.) */
46 stdin_getc(unsigned lim)
52 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
53 log_write(L_lost_incoming_connection,
54 LOG_MAIN, "timed out while reading local message");
55 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
59 if (filter_test == FTEST_NONE)
61 fprintf(stderr, "\nexim: %s received - message abandoned\n",
62 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
63 log_write(0, LOG_MAIN, "%s received while reading local message",
64 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
66 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
74 return ungetc(c, stdin);
92 /*************************************************
93 * Check that a set sender is allowed *
94 *************************************************/
96 /* This function is called when a local caller sets an explicit sender address.
97 It checks whether this is permitted, which it is for trusted callers.
98 Otherwise, it must match the pattern(s) in untrusted_set_sender.
100 Arguments: the proposed sender address
101 Returns: TRUE for a trusted caller
102 TRUE if the address has been set, untrusted_set_sender has been
103 set, and the address matches something in the list
108 receive_check_set_sender(uschar *newsender)
111 if (trusted_caller) return TRUE;
112 if (!newsender || !untrusted_set_sender) return FALSE;
113 qnewsender = Ustrchr(newsender, '@')
114 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
115 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
121 /*************************************************
122 * Read space info for a partition *
123 *************************************************/
125 /* This function is called by receive_check_fs() below, and also by string
126 expansion for variables such as $spool_space. The field names for the statvfs
127 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
128 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
129 have inodes, and they return -1 for the number available.
131 Later: It turns out that some file systems that do not have the concept of
132 inodes return 0 rather than -1. Such systems should also return 0 for the total
133 number of inodes, so we require that to be greater than zero before returning
137 isspool TRUE for spool partition, FALSE for log partition
138 inodeptr address of int to receive inode count; -1 if there isn't one
140 Returns: available on-root space, in kilobytes
141 -1 for log partition if there isn't one
143 All values are -1 if the STATFS functions are not available.
147 receive_statvfs(BOOL isspool, int *inodeptr)
150 struct STATVFS statbuf;
156 /* The spool directory must always exist. */
160 path = spool_directory;
164 /* Need to cut down the log file path to the directory, and to ignore any
165 appearance of "syslog" in it. */
169 int sep = ':'; /* Not variable - outside scripts use */
170 const uschar *p = log_file_path;
173 /* An empty log_file_path means "use the default". This is the same as an
174 empty item in a list. */
176 if (*p == 0) p = US":";
177 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
178 if (Ustrcmp(path, "syslog") != 0)
181 if (path == NULL) /* No log files */
187 /* An empty string means use the default, which is in the spool directory.
188 But don't just use the spool directory, as it is possible that the log
189 subdirectory has been symbolically linked elsewhere. */
193 sprintf(CS buffer, CS"%s/log", CS spool_directory);
199 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
203 /* We now have the path; do the business */
205 memset(&statbuf, 0, sizeof(statbuf));
207 if (STATVFS(CS path, &statbuf) != 0)
208 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
209 { /* Can happen on first run after installation */
215 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
216 "%s directory %s: %s", name, path, strerror(errno));
217 smtp_closedown(US"spool or log directory problem");
218 exim_exit(EXIT_FAILURE, NULL);
221 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
223 /* Disks are getting huge. Take care with computing the size in kilobytes. */
225 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
228 /* Unable to find partition sizes in this environment. */
238 /*************************************************
239 * Check space on spool and log partitions *
240 *************************************************/
242 /* This function is called before accepting a message; if any thresholds are
243 set, it checks them. If a message_size is supplied, it checks that there is
244 enough space for that size plus the threshold - i.e. that the message won't
245 reduce the space to the threshold. Not all OS have statvfs(); for those that
246 don't, this function always returns TRUE. For some OS the old function and
247 struct name statfs is used; that is handled by a macro, defined in exim.h.
250 msg_size the (estimated) size of an incoming message
252 Returns: FALSE if there isn't enough space, or if the information cannot
254 TRUE if no check was done or there is enough space
258 receive_check_fs(int msg_size)
262 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
264 space = receive_statvfs(TRUE, &inodes);
267 debug_printf("spool directory space = %dK inodes = %d "
268 "check_space = %dK inodes = %d msg_size = %d\n",
269 space, inodes, check_spool_space, check_spool_inodes, msg_size);
271 if ((space >= 0 && space < check_spool_space) ||
272 (inodes >= 0 && inodes < check_spool_inodes))
274 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
275 "inodes=%d", space, inodes);
280 if (check_log_space > 0 || check_log_inodes > 0)
282 space = receive_statvfs(FALSE, &inodes);
285 debug_printf("log directory space = %dK inodes = %d "
286 "check_space = %dK inodes = %d\n",
287 space, inodes, check_log_space, check_log_inodes);
289 if ((space >= 0 && space < check_log_space) ||
290 (inodes >= 0 && inodes < check_log_inodes))
292 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
293 "inodes=%d", space, inodes);
303 /*************************************************
304 * Bomb out while reading a message *
305 *************************************************/
307 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
308 received, or if there is a timeout. A rarer case might be if the log files are
309 screwed up and Exim can't open them to record a message's arrival. Handling
310 that case is done by setting a flag to cause the log functions to call this
311 function if there is an ultimate disaster. That is why it is globally
315 reason text reason to pass to the not-quit ACL
316 msg default SMTP response to give if in an SMTP session
321 receive_bomb_out(uschar *reason, uschar *msg)
323 static BOOL already_bombing_out;
324 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
325 timeouts, if someone has something slow in their quit ACL. Since the only
326 things we should be doing are to close down cleanly ASAP, on the second
327 pass we also close down stuff that might be opened again, before bypassing
328 the ACL call and exiting. */
330 /* If spool_name is set, it contains the name of the data file that is being
331 written. Unlink it before closing so that it cannot be picked up by a delivery
332 process. Ensure that any header file is also removed. */
334 if (spool_name[0] != '\0')
337 spool_name[Ustrlen(spool_name) - 1] = 'H';
339 spool_name[0] = '\0';
342 /* Now close the file if it is open, either as a fd or a stream. */
346 (void)fclose(data_file);
349 else if (data_fd >= 0)
351 (void)close(data_fd);
355 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
356 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
359 if (!already_bombing_out)
361 already_bombing_out = TRUE;
364 if (smtp_batched_input)
365 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
366 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
367 smtp_active_hostname, msg);
371 /* Exit from the program (non-BSMTP cases) */
373 exim_exit(EXIT_FAILURE, NULL);
377 /*************************************************
378 * Data read timeout *
379 *************************************************/
381 /* Handler function for timeouts that occur while reading the data that
384 Argument: the signal number
389 data_timeout_handler(int sig)
391 had_data_timeout = sig;
396 /*************************************************
397 * local_scan() timeout *
398 *************************************************/
400 /* Handler function for timeouts that occur while running a local_scan()
401 function. Posix recommends against calling longjmp() from a signal-handler,
402 but the GCC manual says you can so we will, and trust that it's better than
403 calling probably non-signal-safe functions during logging from within the
404 handler, even with other compilers.
406 See also https://cwe.mitre.org/data/definitions/745.html which also lists
409 This is all because we have no control over what might be written for a
410 local-scan function, so cannot sprinkle had-signal checks after each
411 call-site. At least with the default "do-nothing" function we won't
414 Argument: the signal number
419 local_scan_timeout_handler(int sig)
421 had_local_scan_timeout = sig;
422 siglongjmp(local_scan_env, 1);
427 /*************************************************
428 * local_scan() crashed *
429 *************************************************/
431 /* Handler function for signals that occur while running a local_scan()
434 Argument: the signal number
439 local_scan_crash_handler(int sig)
441 had_local_scan_crash = sig;
442 siglongjmp(local_scan_env, 1);
447 /*************************************************
448 * SIGTERM or SIGINT received *
449 *************************************************/
451 /* Handler for SIGTERM or SIGINT signals that occur while reading the
452 data that comprises a message.
454 Argument: the signal number
459 data_sigterm_sigint_handler(int sig)
461 had_data_sigint = sig;
466 /*************************************************
467 * Add new recipient to list *
468 *************************************************/
470 /* This function builds a list of recipient addresses in argc/argv
474 recipient the next address to add to recipients_list
475 pno parent number for fixed aliases; -1 otherwise
481 receive_add_recipient(uschar *recipient, int pno)
483 if (recipients_count >= recipients_list_max)
485 recipient_item *oldlist = recipients_list;
486 int oldmax = recipients_list_max;
487 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
488 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
490 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
493 recipients_list[recipients_count].address = recipient;
494 recipients_list[recipients_count].pno = pno;
495 #ifdef EXPERIMENTAL_BRIGHTMAIL
496 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
497 /* reset optin string pointer for next recipient */
498 bmi_current_optin = NULL;
500 recipients_list[recipients_count].orcpt = NULL;
501 recipients_list[recipients_count].dsn_flags = 0;
502 recipients_list[recipients_count++].errors_to = NULL;
508 /*************************************************
509 * Send user response message *
510 *************************************************/
512 /* This function is passed a default response code and a user message. It calls
513 smtp_message_code() to check and possibly modify the response code, and then
514 calls smtp_respond() to transmit the response. I put this into a function
515 just to avoid a lot of repetition.
518 code the response code
519 user_msg the user message
526 smtp_user_msg(uschar *code, uschar *user_msg)
529 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
530 smtp_respond(code, len, TRUE, user_msg);
538 /*************************************************
539 * Remove a recipient from the list *
540 *************************************************/
542 /* This function is provided for local_scan() to use.
545 recipient address to remove
547 Returns: TRUE if it did remove something; FALSE otherwise
551 receive_remove_recipient(uschar *recipient)
554 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
556 for (count = 0; count < recipients_count; count++)
558 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
560 if ((--recipients_count - count) > 0)
561 memmove(recipients_list + count, recipients_list + count + 1,
562 (recipients_count - count)*sizeof(recipient_item));
573 /*************************************************
574 * Read data portion of a non-SMTP message *
575 *************************************************/
577 /* This function is called to read the remainder of a message (following the
578 header) when the input is not from SMTP - we are receiving a local message on
579 a standard input stream. The message is always terminated by EOF, and is also
580 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
581 two cases for maximum efficiency.
583 Ensure that the body ends with a newline. This will naturally be the case when
584 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
585 as "sequences of lines" - this of course strictly applies only to SMTP, but
586 deliveries into BSD-type mailbox files also require it. Exim used to have a
587 flag for doing this at delivery time, but as it was always set for all
588 transports, I decided to simplify things by putting the check here instead.
590 There is at least one MUA (dtmail) that sends CRLF via this interface, and
591 other programs are known to do this as well. Exim used to have a option for
592 dealing with this: in July 2003, after much discussion, the code has been
593 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
595 However, for the case when a dot on a line by itself terminates a message, the
596 only recognized terminating sequences before and after the dot are LF and CRLF.
597 Otherwise, having read EOL . CR, you don't know whether to read another
600 Internally, in messages stored in Exim's spool files, LF is used as the line
601 terminator. Under the new regime, bare CRs will no longer appear in these
605 fout a FILE to which to write the message
607 Returns: One of the END_xxx values indicating why it stopped reading
611 read_message_data(FILE *fout)
615 register int linelength = 0;
617 /* Handle the case when only EOF terminates the message */
621 register int last_ch = '\n';
623 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
625 if (ch == 0) body_zerocount++;
626 if (last_ch == '\r' && ch != '\n')
628 if (linelength > max_received_linelength)
629 max_received_linelength = linelength;
631 if (fputc('\n', fout) == EOF) return END_WERROR;
635 if (ch == '\r') continue;
637 if (fputc(ch, fout) == EOF) return END_WERROR;
640 if (linelength > max_received_linelength)
641 max_received_linelength = linelength;
646 if (++message_size > thismessage_size_limit) return END_SIZE;
651 if (linelength > max_received_linelength)
652 max_received_linelength = linelength;
653 if (fputc('\n', fout) == EOF) return END_WERROR;
661 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
665 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
667 if (ch == 0) body_zerocount++;
670 case 0: /* Normal state (previous char written) */
674 if (linelength > max_received_linelength)
675 max_received_linelength = linelength;
680 { ch_state = 2; continue; }
683 case 1: /* After written "\n" */
684 if (ch == '.') { ch_state = 3; continue; }
685 if (ch == '\r') { ch_state = 2; continue; }
686 if (ch == '\n') { body_linecount++; linelength = -1; }
691 body_linecount++; /* After unwritten "\r" */
692 if (linelength > max_received_linelength)
693 max_received_linelength = linelength;
701 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
702 if (ch == '\r') continue;
708 case 3: /* After "\n." (\n written, dot not) */
709 if (ch == '\n') return END_DOT;
710 if (ch == '\r') { ch_state = 4; continue; }
713 if (fputc('.', fout) == EOF) return END_WERROR;
717 case 4: /* After "\n.\r" (\n written, rest not) */
718 if (ch == '\n') return END_DOT;
721 if (fputs(".\n", fout) == EOF) return END_WERROR;
722 if (ch == '\r') { ch_state = 2; continue; }
728 if (fputc(ch, fout) == EOF) return END_WERROR;
729 if (++message_size > thismessage_size_limit) return END_SIZE;
732 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
733 the message ends with a newline, and we must also write any characters that
734 were saved up while testing for an ending dot. */
738 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
739 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
740 message_size += Ustrlen(ends[ch_state]);
750 /*************************************************
751 * Read data portion of an SMTP message *
752 *************************************************/
754 /* This function is called to read the remainder of an SMTP message (after the
755 headers), or to skip over it when an error has occurred. In this case, the
756 output file is passed as NULL.
758 If any line begins with a dot, that character is skipped. The input should only
759 be successfully terminated by CR LF . CR LF unless it is local (non-network)
760 SMTP, in which case the CRs are optional, but...
762 FUDGE: It seems that sites on the net send out messages with just LF
763 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
764 we make the CRs optional in all cases.
766 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
767 well, so that there are no CRs in spooled messages. However, the message
768 terminating dot is not recognized between two bare CRs.
771 fout a FILE to which to write the message; NULL if skipping
773 Returns: One of the END_xxx values indicating why it stopped reading
777 read_message_data_smtp(FILE *fout)
783 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
785 if (ch == 0) body_zerocount++;
788 case 0: /* After LF or CRLF */
792 continue; /* Don't ever write . after LF */
796 /* Else fall through to handle as normal uschar. */
798 case 1: /* Normal state */
803 if (linelength > max_received_linelength)
804 max_received_linelength = linelength;
814 case 2: /* After (unwritten) CR */
816 if (linelength > max_received_linelength)
817 max_received_linelength = linelength;
826 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
827 cutthrough_data_put_nl();
828 if (ch != '\r') ch_state = 1; else continue;
832 case 3: /* After [CR] LF . */
840 /* The dot was removed at state 3. For a doubled dot, here, reinstate
841 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
842 and to file below. */
846 cutthrough_data_puts(&c, 1);
851 case 4: /* After [CR] LF . CR */
852 if (ch == '\n') return END_DOT;
855 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
856 cutthrough_data_put_nl();
866 /* Add the character to the spool file, unless skipping; then loop for the
873 if (fputc(ch, fout) == EOF) return END_WERROR;
874 if (message_size > thismessage_size_limit) return END_SIZE;
877 cutthrough_data_put_nl();
881 cutthrough_data_puts(&c, 1);
885 /* Fall through here if EOF encountered. This indicates some kind of error,
886 since a correct message is terminated by [CR] LF . [CR] LF. */
894 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
895 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
896 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
897 body_linecount accounting for proper re-expansion for the wire, so use
898 a cut-down version of the state-machine above; we don't need to do leading-dot
899 detection and unstuffing.
902 fout a FILE to which to write the message; NULL if skipping;
903 must be open for both writing and reading.
905 Returns: One of the END_xxx values indicating why it stopped reading
909 read_message_bdat_smtp(FILE *fout)
911 int linelength = 0, ch;
912 enum CH_STATE ch_state = LF_SEEN;
917 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
919 case EOF: return END_EOF;
920 case ERR: return END_PROTOCOL;
922 /* Nothing to get from the sender anymore. We check the last
923 character written to the spool.
925 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
926 If we would be strict, we would refuse such broken messages.
927 But we are liberal, so we fix it. It would be easy just to append
928 the "\n" to the spool.
930 But there are some more things (line counting, message size calculation and such),
931 that would need to be duplicated here. So we simply do some ungetc
936 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
937 if (fgetc(fout) == '\n') return END_DOT;
940 if (linelength == -1) /* \r already seen (see below) */
942 DEBUG(D_receive) debug_printf("Add missing LF\n");
946 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
947 bdat_ungetc('\r'); /* not even \r was seen */
951 case '\0': body_zerocount++; break;
955 case LF_SEEN: /* After LF or CRLF */
957 /* fall through to handle as normal uschar. */
959 case MID_LINE: /* Mid-line state */
964 if (linelength > max_received_linelength)
965 max_received_linelength = linelength;
971 if (fix_nl) bdat_ungetc('\n');
972 continue; /* don't write CR */
976 case CR_SEEN: /* After (unwritten) CR */
978 if (linelength > max_received_linelength)
979 max_received_linelength = linelength;
986 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
987 cutthrough_data_put_nl();
988 if (ch == '\r') continue; /* don't write CR */
994 /* Add the character to the spool file, unless skipping */
1000 if (fputc(ch, fout) == EOF) return END_WERROR;
1001 if (message_size > thismessage_size_limit) return END_SIZE;
1004 cutthrough_data_put_nl();
1008 cutthrough_data_puts(&c, 1);
1015 read_message_bdat_smtp_wire(FILE *fout)
1019 /* Remember that this message uses wireformat. */
1021 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1022 fout ? "writing spoolfile in wire format" : "flushing input");
1023 spool_file_wireformat = TRUE;
1027 if (chunking_data_left > 0)
1029 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1030 uschar * buf = bdat_getbuf(&len);
1032 if (!buf) return END_EOF;
1033 message_size += len;
1034 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1036 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1038 case EOF: return END_EOF;
1039 case EOD: return END_DOT;
1040 case ERR: return END_PROTOCOL;
1046 max_received_linelength
1050 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1053 if (message_size > thismessage_size_limit) return END_SIZE;
1061 /*************************************************
1062 * Swallow SMTP message *
1063 *************************************************/
1065 /* This function is called when there has been some kind of error while reading
1066 an SMTP message, and the remaining data may need to be swallowed. It is global
1067 because it is called from smtp_closedown() to shut down an incoming call
1070 Argument: a FILE from which to read the message
1075 receive_swallow_smtp(void)
1077 if (message_ended >= END_NOTENDED)
1078 message_ended = chunking_state <= CHUNKING_OFFERED
1079 ? read_message_data_smtp(NULL)
1080 : read_message_bdat_smtp_wire(NULL);
1085 /*************************************************
1086 * Handle lost SMTP connection *
1087 *************************************************/
1089 /* This function logs connection loss incidents and generates an appropriate
1092 Argument: additional data for the message
1093 Returns: the SMTP response
1097 handle_lost_connection(uschar *s)
1099 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1100 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1101 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1102 return US"421 Lost incoming connection";
1108 /*************************************************
1109 * Handle a non-smtp reception error *
1110 *************************************************/
1112 /* This function is called for various errors during the reception of non-SMTP
1113 messages. It either sends a message to the sender of the problem message, or it
1114 writes to the standard error stream.
1117 errcode code for moan_to_sender(), identifying the error
1118 text1 first message text, passed to moan_to_sender()
1119 text2 second message text, used only for stderrr
1120 error_rc code to pass to exim_exit if no problem
1121 f FILE containing body of message (may be stdin)
1122 hptr pointer to instore headers or NULL
1124 Returns: calls exim_exit(), which does not return
1128 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1129 FILE *f, header_line *hptr)
1131 if (error_handling == ERRORS_SENDER)
1135 eblock.text1 = text1;
1136 eblock.text2 = US"";
1137 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1138 error_rc = EXIT_FAILURE;
1141 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1143 exim_exit(error_rc, US"");
1148 /*************************************************
1149 * Add header lines set up by ACL *
1150 *************************************************/
1152 /* This function is called to add the header lines that were set up by
1153 statements in an ACL to the list of headers in memory. It is done in two stages
1154 like this, because when the ACL for RCPT is running, the other headers have not
1155 yet been received. This function is called twice; once just before running the
1156 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1157 are visible to the DATA ACL.
1159 Originally these header lines were added at the end. Now there is support for
1160 three different places: top, bottom, and after the Received: header(s). There
1161 will always be at least one Received: header, even if it is marked deleted, and
1162 even if something else has been put in front of it.
1165 acl_name text to identify which ACL
1171 add_acl_headers(int where, uschar *acl_name)
1173 header_line *h, *next;
1174 header_line *last_received = NULL;
1178 case ACL_WHERE_DKIM:
1179 case ACL_WHERE_MIME:
1180 case ACL_WHERE_DATA:
1181 if ( cutthrough.fd >= 0 && cutthrough.delivery
1182 && (acl_removed_headers || acl_added_headers))
1184 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1185 " will not take effect on cutthrough deliveries");
1190 if (acl_removed_headers)
1192 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1194 for (h = header_list; h; h = h->next) if (h->type != htype_old)
1196 const uschar * list = acl_removed_headers;
1197 int sep = ':'; /* This is specified as a colon-separated list */
1201 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1202 if (header_testname(h, s, Ustrlen(s), FALSE))
1204 h->type = htype_old;
1205 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1208 acl_removed_headers = NULL;
1209 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1212 if (!acl_added_headers) return;
1213 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1215 for (h = acl_added_headers; h; h = next)
1222 h->next = header_list;
1224 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1230 last_received = header_list;
1231 while (!header_testname(last_received, US"Received", 8, FALSE))
1232 last_received = last_received->next;
1233 while (last_received->next &&
1234 header_testname(last_received->next, US"Received", 8, FALSE))
1235 last_received = last_received->next;
1237 h->next = last_received->next;
1238 last_received->next = h;
1239 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1243 /* add header before any header which is NOT Received: or Resent- */
1244 last_received = header_list;
1245 while ( last_received->next &&
1246 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1247 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1248 last_received = last_received->next;
1249 /* last_received now points to the last Received: or Resent-* header
1250 in an uninterrupted chain of those header types (seen from the beginning
1251 of all headers. Our current header must follow it. */
1252 h->next = last_received->next;
1253 last_received->next = h;
1254 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1259 header_last->next = h;
1260 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1264 if (!h->next) header_last = h;
1266 /* Check for one of the known header types (From:, To:, etc.) though in
1267 practice most added headers are going to be "other". Lower case
1268 identification letters are never stored with the header; they are used
1269 for existence tests when messages are received. So discard any lower case
1272 h->type = header_checkname(h, FALSE);
1273 if (h->type >= 'a') h->type = htype_other;
1275 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1278 acl_added_headers = NULL;
1279 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1284 /*************************************************
1285 * Add host information for log line *
1286 *************************************************/
1288 /* Called for acceptance and rejecting log lines. This adds information about
1289 the calling host to a string that is being built dynamically.
1292 s the dynamic string
1294 Returns: the extended string
1298 add_host_info_for_log(gstring * g)
1300 if (sender_fullhost)
1302 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1303 g = string_catn(g, US" DS", 3);
1304 g = string_append(g, 2, US" H=", sender_fullhost);
1305 if (LOGGING(incoming_interface) && interface_address != NULL)
1308 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1311 if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1313 g = string_catn(g, US" TFO", 4);
1314 tcp_in_fastopen_logged = TRUE;
1317 g = string_append(g, 2, US" U=", sender_ident);
1318 if (received_protocol)
1319 g = string_append(g, 2, US" P=", received_protocol);
1325 #ifdef WITH_CONTENT_SCAN
1327 /*************************************************
1328 * Run the MIME ACL on a message *
1329 *************************************************/
1331 /* This code is in a subroutine so that it can be used for both SMTP
1332 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1335 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1336 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1337 smtp_reply_ptr Where SMTP reply is being built
1338 blackholed_by_ptr Where "blackholed by" message is being built
1340 Returns: TRUE to carry on; FALSE to abandon the message
1344 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1345 uschar **blackholed_by_ptr)
1348 uschar * rfc822_file_path = NULL;
1349 unsigned long mbox_size;
1350 header_line *my_headerlist;
1351 uschar *user_msg, *log_msg;
1352 int mime_part_count_buffer = -1;
1353 uschar * mbox_filename;
1356 /* check if it is a MIME message */
1358 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1359 if ( my_headerlist->type != '*' /* skip deleted headers */
1360 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1363 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1367 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1372 /* make sure the eml mbox file is spooled up */
1373 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1374 { /* error while spooling */
1375 log_write(0, LOG_MAIN|LOG_PANIC,
1376 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1377 Uunlink(spool_name);
1379 #ifdef EXPERIMENTAL_DCC
1382 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1383 message_id[0] = 0; /* Indicate no message accepted */
1384 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1385 return FALSE; /* Indicate skip to end of receive function */
1391 mime_part_count = -1;
1392 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1393 (void)fclose(mbox_file);
1395 if (rfc822_file_path)
1397 mime_part_count = mime_part_count_buffer;
1399 if (unlink(CS rfc822_file_path) == -1)
1401 log_write(0, LOG_PANIC,
1402 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1405 rfc822_file_path = NULL;
1408 /* check if we must check any message/rfc822 attachments */
1411 uschar * scandir = string_copyn(mbox_filename,
1412 Ustrrchr(mbox_filename, '/') - mbox_filename);
1413 struct dirent * entry;
1416 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1417 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1419 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1421 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1427 if (rfc822_file_path)
1429 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1431 /* set RFC822 expansion variable */
1433 mime_part_count_buffer = mime_part_count;
1434 goto MIME_ACL_CHECK;
1436 log_write(0, LOG_PANIC,
1437 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1438 unlink(CS rfc822_file_path);
1443 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1446 recipients_count = 0;
1447 *blackholed_by_ptr = US"MIME ACL";
1451 Uunlink(spool_name);
1453 #ifdef EXPERIMENTAL_DCC
1458 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1459 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1460 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1462 message_id[0] = 0; /* Indicate no message accepted */
1463 return FALSE; /* Cause skip to end of receive function */
1469 #endif /* WITH_CONTENT_SCAN */
1474 received_header_gen(void)
1478 header_line *received_header= header_list;
1480 timestamp = expand_string(US"${tod_full}");
1481 if (recipients_count == 1) received_for = recipients_list[0].address;
1482 received = expand_string(received_header_text);
1483 received_for = NULL;
1487 if(spool_name[0] != 0)
1488 Uunlink(spool_name); /* Lose the data file */
1489 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1490 "(received_header_text) failed: %s", string_printing(received_header_text),
1491 expand_string_message);
1494 /* The first element on the header chain is reserved for the Received header,
1495 so all we have to do is fill in the text pointer, and set the type. However, if
1496 the result of the expansion is an empty string, we leave the header marked as
1497 "old" so as to refrain from adding a Received header. */
1499 if (received[0] == 0)
1501 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1502 received_header->type = htype_old;
1506 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1507 received_header->type = htype_received;
1510 received_header->slen = Ustrlen(received_header->text);
1512 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1513 received_header->type, received_header->text);
1518 /*************************************************
1520 *************************************************/
1522 /* Receive a message on the given input, and put it into a pair of spool files.
1523 Either a non-null list of recipients, or the extract flag will be true, or
1524 both. The flag sender_local is true for locally generated messages. The flag
1525 submission_mode is true if an ACL has obeyed "control = submission". The flag
1526 suppress_local_fixups is true if an ACL has obeyed "control =
1527 suppress_local_fixups" or -G was passed on the command-line.
1528 The flag smtp_input is true if the message is to be
1529 handled using SMTP conventions about termination and lines starting with dots.
1530 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1532 If a message was successfully read, message_id[0] will be non-zero.
1534 The general actions of this function are:
1536 . Read the headers of the message (if any) into a chain of store
1539 . If there is a "sender:" header and the message is locally originated,
1540 throw it away, unless the caller is trusted, or unless
1541 active_local_sender_retain is set - which can only happen if
1542 active_local_from_check is false.
1544 . If recipients are to be extracted from the message, build the
1545 recipients list from the headers, removing any that were on the
1546 original recipients list (unless extract_addresses_remove_arguments is
1547 false), and at the same time, remove any bcc header that may be present.
1549 . Get the spool file for the data, sort out its unique name, open
1550 and lock it (but don't give it the name yet).
1552 . Generate a "Message-Id" header if the message doesn't have one, for
1553 locally-originated messages.
1555 . Generate a "Received" header.
1557 . Ensure the recipients list is fully qualified and rewritten if necessary.
1559 . If there are any rewriting rules, apply them to the sender address
1560 and also to the headers.
1562 . If there is no from: header, generate one, for locally-generated messages
1563 and messages in "submission mode" only.
1565 . If the sender is local, check that from: is correct, and if not, generate
1566 a Sender: header, unless message comes from a trusted caller, or this
1567 feature is disabled by active_local_from_check being false.
1569 . If there is no "date" header, generate one, for locally-originated
1570 or submission mode messages only.
1572 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1573 dot_ends mode, to the data file. Leave it open, to hold the lock.
1575 . Write the envelope and the headers to a new file.
1577 . Set the name for the header file; close it.
1579 . Set the name for the data file; close it.
1581 Because this function can potentially be called many times in a single
1582 SMTP connection, all store should be got by store_get(), so that it will be
1583 automatically retrieved after the message is accepted.
1585 FUDGE: It seems that sites on the net send out messages with just LF
1586 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1587 we make the CRs optional in all cases.
1589 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1590 new regime is now in place in which bare CRs in header lines are turned into LF
1591 followed by a space, so as not to terminate the header line.
1593 February 2004: A bare LF in a header line in a message whose first line was
1594 terminated by CRLF is treated in the same way as a bare CR.
1597 extract_recip TRUE if recipients are to be extracted from the message's
1600 Returns: TRUE there are more messages to be read (SMTP input)
1601 FALSE there are no more messages to be read (non-SMTP input
1602 or SMTP connection collapsed, or other failure)
1604 When reading a message for filter testing, the returned value indicates
1605 whether the headers (which is all that is read) were terminated by '.' or
1609 receive_msg(BOOL extract_recip)
1614 int process_info_len = Ustrlen(process_info);
1615 int error_rc = error_handling == ERRORS_SENDER
1616 ? errors_sender_rc : EXIT_FAILURE;
1617 int header_size = 256;
1618 int start, end, domain;
1621 int prevlines_length = 0;
1623 register int ptr = 0;
1625 BOOL contains_resent_headers = FALSE;
1626 BOOL extracted_ignored = FALSE;
1627 BOOL first_line_ended_crlf = TRUE_UNSET;
1628 BOOL smtp_yield = TRUE;
1631 BOOL resents_exist = FALSE;
1632 uschar *resent_prefix = US"";
1633 uschar *blackholed_by = NULL;
1634 uschar *blackhole_log_msg = US"";
1635 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1638 error_block *bad_addresses = NULL;
1640 uschar *frozen_by = NULL;
1641 uschar *queued_by = NULL;
1645 struct stat statbuf;
1647 /* Final message to give to SMTP caller, and messages from ACLs */
1649 uschar *smtp_reply = NULL;
1650 uschar *user_msg, *log_msg;
1652 /* Working header pointers */
1654 header_line *h, *next;
1656 /* Flags for noting the existence of certain headers (only one left) */
1658 BOOL date_header_exists = FALSE;
1660 /* Pointers to receive the addresses of headers whose contents we need. */
1662 header_line *from_header = NULL;
1663 header_line *subject_header = NULL;
1664 header_line *msgid_header = NULL;
1665 header_line *received_header;
1667 #ifdef EXPERIMENTAL_DMARC
1669 #endif /* EXPERIMENTAL_DMARC */
1671 /* Variables for use when building the Received: header. */
1677 /* Release any open files that might have been cached while preparing to
1678 accept the message - e.g. by verifying addresses - because reading a message
1679 might take a fair bit of real time. */
1683 /* Extracting the recipient list from an input file is incompatible with
1684 cutthrough delivery with the no-spool option. It shouldn't be possible
1685 to set up the combination, but just in case kill any ongoing connection. */
1686 if (extract_recip || !smtp_input)
1687 cancel_cutthrough_connection(TRUE, US"not smtp input");
1689 /* Initialize the chain of headers by setting up a place-holder for Received:
1690 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1691 pointing to the end of the chain to make adding headers simple. */
1693 received_header = header_list = header_last = store_get(sizeof(header_line));
1694 header_list->next = NULL;
1695 header_list->type = htype_old;
1696 header_list->text = NULL;
1697 header_list->slen = 0;
1699 /* Control block for the next header to be read. */
1701 next = store_get(sizeof(header_line));
1702 next->text = store_get(header_size);
1704 /* Initialize message id to be null (indicating no message read), and the
1705 header names list to be the normal list. Indicate there is no data file open
1706 yet, initialize the size and warning count, and deal with no size limit. */
1714 received_count = 1; /* For the one we will add */
1716 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1718 /* While reading the message, the following counts are computed. */
1720 message_linecount = body_linecount = body_zerocount =
1721 max_received_linelength = 0;
1723 #ifndef DISABLE_DKIM
1724 /* Call into DKIM to set up the context. In CHUNKING mode
1725 we clear the dot-stuffing flag */
1726 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1727 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1730 #ifdef EXPERIMENTAL_DMARC
1731 /* initialize libopendmarc */
1732 dmarc_up = dmarc_init();
1735 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1736 ids, and fractions of a second are required. See the comments that precede the
1737 message id creation below. */
1739 (void)gettimeofday(&message_id_tv, NULL);
1741 /* For other uses of the received time we can operate with granularity of one
1742 second, and for that we use the global variable received_time. This is for
1743 things like ultimate message timeouts. */
1745 received_time = message_id_tv;
1747 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1748 happen in the smtp_getc() function when it refills its buffer. */
1750 had_data_timeout = 0;
1752 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1754 /* If not SMTP input, timeout happens only if configured, and we just set a
1755 single timeout for the whole message. */
1757 else if (receive_timeout > 0)
1759 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1760 alarm(receive_timeout);
1763 /* SIGTERM and SIGINT are caught always. */
1765 had_data_sigint = 0;
1766 signal(SIGTERM, data_sigterm_sigint_handler);
1767 signal(SIGINT, data_sigterm_sigint_handler);
1769 /* Header lines in messages are not supposed to be very long, though when
1770 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1771 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1772 storing the header, and extend this as necessary using string_cat().
1774 To cope with total lunacies, impose an upper limit on the length of the header
1775 section of the message, as otherwise the store will fill up. We must also cope
1776 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1777 Folded header lines are joined into one string, leaving the '\n' characters
1778 inside them, so that writing them out reproduces the input.
1780 Loop for each character of each header; the next structure for chaining the
1781 header is set up already, with ptr the offset of the next character in
1786 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1788 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1789 SMTP must have a correct "." terminator. */
1791 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1793 smtp_reply = handle_lost_connection(US" (header)");
1795 goto TIDYUP; /* Skip to end of function */
1798 /* See if we are at the current header's size limit - there must be at least
1799 four bytes left. This allows for the new character plus a zero, plus two for
1800 extra insertions when we are playing games with dots and carriage returns. If
1801 we are at the limit, extend the text buffer. This could have been done
1802 automatically using string_cat() but because this is a tightish loop storing
1803 only one character at a time, we choose to do it inline. Normally
1804 store_extend() will be able to extend the block; only at the end of a big
1805 store block will a copy be needed. To handle the case of very long headers
1806 (and sometimes lunatic messages can have ones that are 100s of K long) we
1807 call store_release() for strings that have been copied - if the string is at
1808 the start of a block (and therefore the only thing in it, because we aren't
1809 doing any other gets), the block gets freed. We can only do this release if
1810 there were no allocations since the once that we want to free. */
1812 if (ptr >= header_size - 4)
1814 int oldsize = header_size;
1815 /* header_size += 256; */
1817 if (!store_extend(next->text, oldsize, header_size))
1818 next->text = store_newblock(next->text, header_size, ptr);
1821 /* Cope with receiving a binary zero. There is dispute about whether
1822 these should be allowed in RFC 822 messages. The middle view is that they
1823 should not be allowed in headers, at least. Exim takes this attitude at
1824 the moment. We can't just stomp on them here, because we don't know that
1825 this line is a header yet. Set a flag to cause scanning later. */
1827 if (ch == 0) had_zero++;
1829 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1830 those from data files use just LF. Treat LF in local SMTP input as a
1831 terminator too. Treat EOF as a line terminator always. */
1833 if (ch == EOF) goto EOL;
1835 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1836 other MTAs accept this. We are therefore forced into this "liberalisation"
1837 too, so we accept LF as a line terminator whatever the source of the message.
1838 However, if the first line of the message ended with a CRLF, we treat a bare
1839 LF specially by inserting a white space after it to ensure that the header
1840 line is not terminated. */
1844 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1845 else if (first_line_ended_crlf) receive_ungetc(' ');
1849 /* This is not the end of the line. If this is SMTP input and this is
1850 the first character in the line and it is a "." character, ignore it.
1851 This implements the dot-doubling rule, though header lines starting with
1852 dots aren't exactly common. They are legal in RFC 822, though. If the
1853 following is CRLF or LF, this is the line that that terminates the
1854 entire message. We set message_ended to indicate this has happened (to
1855 prevent further reading), and break out of the loop, having freed the
1856 empty header, and set next = NULL to indicate no data line. */
1858 if (ptr == 0 && ch == '.' && dot_ends)
1860 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1863 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1867 ch = '\r'; /* Revert to CR */
1872 message_ended = END_DOT;
1875 break; /* End character-reading loop */
1878 /* For non-SMTP input, the dot at the start of the line was really a data
1879 character. What is now in ch is the following character. We guaranteed
1880 enough space for this above. */
1884 next->text[ptr++] = '.';
1889 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1890 remember this case if this is the first line ending. */
1894 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1897 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1901 /* Otherwise, put back the character after CR, and turn the bare CR
1904 ch = (receive_ungetc)(ch);
1905 next->text[ptr++] = '\n';
1910 /* We have a data character for the header line. */
1912 next->text[ptr++] = ch; /* Add to buffer */
1913 message_size++; /* Total message size so far */
1915 /* Handle failure due to a humungously long header section. The >= allows
1916 for the terminating \n. Add what we have so far onto the headers list so
1917 that it gets reflected in any error message, and back up the just-read
1920 if (message_size >= header_maxsize)
1922 next->text[ptr] = 0;
1924 next->type = htype_other;
1926 header_last->next = next;
1929 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1930 "%s (more than %d characters): message abandoned",
1931 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1935 smtp_reply = US"552 Message header is ridiculously long";
1936 receive_swallow_smtp();
1937 goto TIDYUP; /* Skip to end of function */
1942 give_local_error(ERRMESS_VLONGHEADER,
1943 string_sprintf("message header longer than %d characters received: "
1944 "message not accepted", header_maxsize), US"", error_rc, stdin,
1946 /* Does not return */
1950 continue; /* With next input character */
1952 /* End of header line reached */
1956 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1958 receive_linecount++;
1959 message_linecount++;
1961 /* Keep track of maximum line length */
1963 if (ptr - prevlines_length > max_received_linelength)
1964 max_received_linelength = ptr - prevlines_length;
1965 prevlines_length = ptr + 1;
1967 /* Now put in the terminating newline. There is always space for
1968 at least two more characters. */
1970 next->text[ptr++] = '\n';
1973 /* A blank line signals the end of the headers; release the unwanted
1974 space and set next to NULL to indicate this. */
1983 /* There is data in the line; see if the next input character is a
1984 whitespace character. If it is, we have a continuation of this header line.
1985 There is always space for at least one character at this point. */
1989 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1990 if (nextch == ' ' || nextch == '\t')
1992 next->text[ptr++] = nextch;
1994 continue; /* Iterate the loop */
1996 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1997 else ch = EOF; /* Cause main loop to exit at end */
2000 /* We have got to the real line end. Terminate the string and release store
2001 beyond it. If it turns out to be a real header, internal binary zeros will
2002 be squashed later. */
2004 next->text[ptr] = 0;
2006 store_reset(next->text + ptr + 1);
2008 /* Check the running total size against the overall message size limit. We
2009 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2010 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2011 headers - the code to read the body will then also hit the buffer. */
2013 if (message_size > thismessage_size_limit) break;
2015 /* A line that is not syntactically correct for a header also marks
2016 the end of the headers. In this case, we leave next containing the
2017 first data line. This might actually be several lines because of the
2018 continuation logic applied above, but that doesn't matter.
2020 It turns out that smail, and presumably sendmail, accept leading lines
2023 From ph10 Fri Jan 5 12:35 GMT 1996
2025 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2026 find any documentation of this, but for compatibility it had better be
2027 accepted. Exim restricts it to the case of non-smtp messages, and
2028 treats it as an alternative to the -f command line option. Thus it is
2029 ignored except for trusted users or filter testing. Otherwise it is taken
2030 as the sender address, unless -f was used (sendmail compatibility).
2032 It further turns out that some UUCPs generate the From_line in a different
2035 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2037 The regex for matching these things is now capable of recognizing both
2038 formats (including 2- and 4-digit years in the latter). In fact, the regex
2039 is now configurable, as is the expansion string to fish out the sender.
2041 Even further on it has been discovered that some broken clients send
2042 these lines in SMTP messages. There is now an option to ignore them from
2043 specified hosts or networks. Sigh. */
2045 if ( header_last == header_list
2047 || ( sender_host_address
2048 && verify_check_host(&ignore_fromline_hosts) == OK
2050 || (!sender_host_address && ignore_fromline_local)
2052 && regex_match_and_setup(regex_From, next->text, 0, -1)
2055 if (!sender_address_forced)
2057 uschar *uucp_sender = expand_string(uucp_from_sender);
2059 log_write(0, LOG_MAIN|LOG_PANIC,
2060 "expansion of \"%s\" failed after matching "
2061 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2064 int start, end, domain;
2066 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2067 &start, &end, &domain, TRUE);
2070 if (domain == 0 && newsender[0] != 0)
2071 newsender = rewrite_address_qualify(newsender, FALSE);
2073 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2075 sender_address = newsender;
2077 if (trusted_caller || filter_test != FTEST_NONE)
2079 authenticated_sender = NULL;
2080 originator_name = US"";
2081 sender_local = FALSE;
2084 if (filter_test != FTEST_NONE)
2085 printf("Sender taken from \"From \" line\n");
2092 /* Not a leading "From " line. Check to see if it is a valid header line.
2093 Header names may contain any non-control characters except space and colon,
2098 uschar *p = next->text;
2100 /* If not a valid header line, break from the header reading loop, leaving
2101 next != NULL, indicating that it holds the first line of the body. */
2103 if (isspace(*p)) break;
2104 while (mac_isgraph(*p) && *p != ':') p++;
2105 while (isspace(*p)) p++;
2108 body_zerocount = had_zero;
2112 /* We have a valid header line. If there were any binary zeroes in
2113 the line, stomp on them here. */
2116 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2118 /* It is perfectly legal to have an empty continuation line
2119 at the end of a header, but it is confusing to humans
2120 looking at such messages, since it looks like a blank line.
2121 Reduce confusion by removing redundant white space at the
2122 end. We know that there is at least one printing character
2123 (the ':' tested for above) so there is no danger of running
2126 p = next->text + ptr - 2;
2129 while (*p == ' ' || *p == '\t') p--;
2130 if (*p != '\n') break;
2131 ptr = (p--) - next->text + 1;
2132 message_size -= next->slen - ptr;
2133 next->text[ptr] = 0;
2137 /* Add the header to the chain */
2139 next->type = htype_other;
2141 header_last->next = next;
2144 /* Check the limit for individual line lengths. This comes after adding to
2145 the chain so that the failing line is reflected if a bounce is generated
2146 (for a local message). */
2148 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2150 log_write(0, LOG_MAIN, "overlong message header line received from "
2151 "%s (more than %d characters): message abandoned",
2152 sender_host_unknown? sender_ident : sender_fullhost,
2153 header_line_maxsize);
2157 smtp_reply = US"552 A message header line is too long";
2158 receive_swallow_smtp();
2159 goto TIDYUP; /* Skip to end of function */
2163 give_local_error(ERRMESS_VLONGHDRLINE,
2164 string_sprintf("message header line longer than %d characters "
2165 "received: message not accepted", header_line_maxsize), US"",
2166 error_rc, stdin, header_list->next);
2167 /* Does not return */
2170 /* Note if any resent- fields exist. */
2172 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2174 resents_exist = TRUE;
2175 resent_prefix = US"Resent-";
2179 /* Reject CHUNKING messages that do not CRLF their first header line */
2181 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2183 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2184 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2186 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2187 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2188 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2191 goto TIDYUP; /* Skip to end of function */
2194 /* The line has been handled. If we have hit EOF, break out of the loop,
2195 indicating no pending data line. */
2197 if (ch == EOF) { next = NULL; break; }
2199 /* Set up for the next header */
2202 next = store_get(sizeof(header_line));
2203 next->text = store_get(header_size);
2206 prevlines_length = 0;
2207 } /* Continue, starting to read the next header */
2209 /* At this point, we have read all the headers into a data structure in main
2210 store. The first header is still the dummy placeholder for the Received: header
2211 we are going to generate a bit later on. If next != NULL, it contains the first
2212 data line - which terminated the headers before reaching a blank line (not the
2217 debug_printf(">>Headers received:\n");
2218 for (h = header_list->next; h; h = h->next)
2219 debug_printf("%s", h->text);
2223 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2224 is dropped immediately after valid headers, the next thing we will see is EOF.
2225 We must test for this specially, as further down the reading of the data is
2226 skipped if already at EOF. */
2228 if (smtp_input && (receive_feof)())
2230 smtp_reply = handle_lost_connection(US" (after header)");
2232 goto TIDYUP; /* Skip to end of function */
2235 /* If this is a filter test run and no headers were read, output a warning
2236 in case there is a mistake in the test message. */
2238 if (filter_test != FTEST_NONE && header_list->next == NULL)
2239 printf("Warning: no message headers read\n");
2242 /* Scan the headers to identify them. Some are merely marked for later
2243 processing; some are dealt with here. */
2245 for (h = header_list->next; h; h = h->next)
2247 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2248 if (is_resent) contains_resent_headers = TRUE;
2250 switch (header_checkname(h, is_resent))
2253 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2257 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2260 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2263 if (!resents_exist || is_resent) date_header_exists = TRUE;
2266 /* Same comments as about Return-Path: below. */
2268 case htype_delivery_date:
2269 if (delivery_date_remove) h->type = htype_old;
2272 /* Same comments as about Return-Path: below. */
2274 case htype_envelope_to:
2275 if (envelope_to_remove) h->type = htype_old;
2278 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2279 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2280 header consists of just the login id of the user who called Exim, rewrite
2281 it with the gecos field first. Apply this rule to Resent-From: if there
2282 are resent- fields. */
2285 h->type = htype_from;
2286 if (!resents_exist || is_resent)
2292 uschar *s = Ustrchr(h->text, ':') + 1;
2293 while (isspace(*s)) s++;
2294 len = h->slen - (s - h->text) - 1;
2295 if (Ustrlen(originator_login) == len &&
2296 strncmpic(s, originator_login, len) == 0)
2298 uschar *name = is_resent? US"Resent-From" : US"From";
2299 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2300 originator_login, qualify_domain_sender);
2301 from_header = header_last;
2302 h->type = htype_old;
2303 DEBUG(D_receive|D_rewrite)
2304 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2310 /* Identify the Message-id: header for generating "in-reply-to" in the
2311 autoreply transport. For incoming logging, save any resent- value. In both
2312 cases, take just the first of any multiples. */
2315 if (!msgid_header && (!resents_exist || is_resent))
2322 /* Flag all Received: headers */
2324 case htype_received:
2325 h->type = htype_received;
2329 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2331 case htype_reply_to:
2332 h->type = htype_reply_to;
2335 /* The Return-path: header is supposed to be added to messages when
2336 they leave the SMTP system. We shouldn't receive messages that already
2337 contain Return-path. However, since Exim generates Return-path: on
2338 local delivery, resent messages may well contain it. We therefore
2339 provide an option (which defaults on) to remove any Return-path: headers
2340 on input. Removal actually means flagging as "old", which prevents the
2341 header being transmitted with the message. */
2343 case htype_return_path:
2344 if (return_path_remove) h->type = htype_old;
2346 /* If we are testing a mail filter file, use the value of the
2347 Return-Path: header to set up the return_path variable, which is not
2348 otherwise set. However, remove any <> that surround the address
2349 because the variable doesn't have these. */
2351 if (filter_test != FTEST_NONE)
2353 uschar *start = h->text + 12;
2354 uschar *end = start + Ustrlen(start);
2355 while (isspace(*start)) start++;
2356 while (end > start && isspace(end[-1])) end--;
2357 if (*start == '<' && end[-1] == '>')
2362 return_path = string_copyn(start, end - start);
2363 printf("Return-path taken from \"Return-path:\" header line\n");
2367 /* If there is a "Sender:" header and the message is locally originated,
2368 and from an untrusted caller and suppress_local_fixups is not set, or if we
2369 are in submission mode for a remote message, mark it "old" so that it will
2370 not be transmitted with the message, unless active_local_sender_retain is
2371 set. (This can only be true if active_local_from_check is false.) If there
2372 are any resent- headers in the message, apply this rule to Resent-Sender:
2373 instead of Sender:. Messages with multiple resent- header sets cannot be
2374 tidily handled. (For this reason, at least one MUA - Pine - turns old
2375 resent- headers into X-resent- headers when resending, leaving just one
2379 h->type = !active_local_sender_retain
2380 && ( sender_local && !trusted_caller && !suppress_local_fixups
2383 && (!resents_exist || is_resent)
2384 ? htype_old : htype_sender;
2387 /* Remember the Subject: header for logging. There is no Resent-Subject */
2393 /* "To:" gets flagged, and the existence of a recipient header is noted,
2394 whether it's resent- or not. */
2399 to_or_cc_header_exists = TRUE;
2405 /* Extract recipients from the headers if that is required (the -t option).
2406 Note that this is documented as being done *before* any address rewriting takes
2407 place. There are two possibilities:
2409 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2410 recipients already listed are to be REMOVED from the message. Smail 3 works
2411 like this. We need to build a non-recipients tree for that list, because in
2412 subsequent processing this data is held in a tree and that's what the
2413 spool_write_header() function expects. Make sure that non-recipient addresses
2414 are fully qualified and rewritten if necessary.
2416 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2417 those in the command line arguments (and it is rumoured some other MTAs do
2418 this). Therefore, there is an option to make Exim behave this way.
2420 *** Notes on "Resent-" header lines ***
2422 The presence of resent-headers in the message makes -t horribly ambiguous.
2423 Experiments with sendmail showed that it uses recipients for all resent-
2424 headers, totally ignoring the concept of "sets of resent- headers" as described
2425 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2426 with all the addresses in one instance of each header.
2428 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2429 error for -t if there were resent- headers in the message. However, after a
2430 discussion on the mailing list, I've learned that there are MUAs that use
2431 resent- headers with -t, and also that the stuff about sets of resent- headers
2432 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2433 message with -t and resent- header lines makes sure that only *its* resent-
2434 headers are present; previous ones are often renamed as X-resent- for example.
2436 Consequently, Exim has been changed so that, if any resent- header lines are
2437 present, the recipients are taken from all of the appropriate resent- lines,
2438 and not from the ordinary To:, Cc:, etc. */
2443 error_block **bnext = &bad_addresses;
2445 if (extract_addresses_remove_arguments)
2447 while (recipients_count-- > 0)
2449 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2450 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2451 tree_add_nonrecipient(s);
2453 recipients_list = NULL;
2454 recipients_count = recipients_list_max = 0;
2457 /* Now scan the headers */
2459 for (h = header_list->next; h; h = h->next)
2461 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2462 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2464 uschar *s = Ustrchr(h->text, ':') + 1;
2465 while (isspace(*s)) s++;
2467 parse_allow_group = TRUE; /* Allow address group syntax */
2471 uschar *ss = parse_find_address_end(s, FALSE);
2472 uschar *recipient, *errmess, *p, *pp;
2473 int start, end, domain;
2475 /* Check on maximum */
2477 if (recipients_max > 0 && ++rcount > recipients_max)
2479 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2480 US"message rejected: ", error_rc, stdin, NULL);
2481 /* Does not return */
2484 /* Make a copy of the address, and remove any internal newlines. These
2485 may be present as a result of continuations of the header line. The
2486 white space that follows the newline must not be removed - it is part
2489 pp = recipient = store_get(ss - s + 1);
2490 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2495 BOOL b = allow_utf8_domains;
2496 allow_utf8_domains = TRUE;
2498 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2502 if (string_is_utf8(recipient))
2503 message_smtputf8 = TRUE;
2505 allow_utf8_domains = b;
2509 /* Keep a list of all the bad addresses so we can send a single
2510 error message at the end. However, an empty address is not an error;
2511 just ignore it. This can come from an empty group list like
2513 To: Recipients of list:;
2515 If there are no recipients at all, an error will occur later. */
2517 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2519 int len = Ustrlen(s);
2520 error_block *b = store_get(sizeof(error_block));
2521 while (len > 0 && isspace(s[len-1])) len--;
2523 b->text1 = string_printing(string_copyn(s, len));
2529 /* If the recipient is already in the nonrecipients tree, it must
2530 have appeared on the command line with the option extract_addresses_
2531 remove_arguments set. Do not add it to the recipients, and keep a note
2532 that this has happened, in order to give a better error if there are
2533 no recipients left. */
2535 else if (recipient != NULL)
2537 if (tree_search(tree_nonrecipients, recipient) == NULL)
2538 receive_add_recipient(recipient, -1);
2540 extracted_ignored = TRUE;
2543 /* Move on past this address */
2545 s = ss + (*ss? 1:0);
2546 while (isspace(*s)) s++;
2547 } /* Next address */
2549 parse_allow_group = FALSE; /* Reset group syntax flags */
2550 parse_found_group = FALSE;
2552 /* If this was the bcc: header, mark it "old", which means it
2553 will be kept on the spool, but not transmitted as part of the
2556 if (h->type == htype_bcc) h->type = htype_old;
2557 } /* For appropriate header line */
2558 } /* For each header line */
2562 /* Now build the unique message id. This has changed several times over the
2563 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2564 Retaining all the history in the comment has become too unwieldy - read
2565 previous release sources if you want it.
2567 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2568 The first part is the current time, in seconds. The second part is the current
2569 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2570 can hold a number in the range 0-3843. It used to be a computed sequence
2571 number, but is now the fractional component of the current time in units of
2572 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2573 received, Exim ensures that the timer has ticked at the appropriate level
2574 before proceeding, to avoid duplication if the pid happened to be re-used
2575 within the same time period. It seems likely that most messages will take at
2576 least half a millisecond to be received, so no delay will normally be
2577 necessary. At least for some time...
2579 There is a modification when localhost_number is set. Formerly this was allowed
2580 to be as large as 255. Now it is restricted to the range 0-16, and the final
2581 component of the message id becomes (localhost_number * 200) + fractional time
2582 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2584 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2585 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2586 still allows the tttttt field to hold a large enough number to last for some
2587 more decades, and the final two-digit field can hold numbers up to 1295, which
2588 is enough for milliseconds (instead of 1/2000 of a second).
2590 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2591 pid, so it is probably safe because pids have to be positive. The
2592 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2593 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2595 Note that string_base62() returns its data in a static storage block, so it
2596 must be copied before calling string_base62() again. It always returns exactly
2599 There doesn't seem to be anything in the RFC which requires a message id to
2600 start with a letter, but Smail was changed to ensure this. The external form of
2601 the message id (as supplied by string expansion) therefore starts with an
2602 additional leading 'E'. The spool file names do not include this leading
2603 letter and it is not used internally.
2605 NOTE: If ever the format of message ids is changed, the regular expression for
2606 checking that a string is in this format must be updated in a corresponding
2607 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2608 must also be changed to reflect the correct string length. The queue-sort code
2609 needs to know the layout. Then, of course, other programs that rely on the
2610 message id format will need updating too. */
2612 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2613 message_id[6] = '-';
2614 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2616 /* Deal with the case where the host number is set. The value of the number was
2617 checked when it was read, to ensure it isn't too big. The timing granularity is
2618 left in id_resolution so that an appropriate wait can be done after receiving
2619 the message, if necessary (we hope it won't be). */
2621 if (host_number_string)
2623 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2624 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2625 string_base62((long int)(
2626 host_number * (1000000/id_resolution) +
2627 message_id_tv.tv_usec/id_resolution)) + 4);
2630 /* Host number not set: final field is just the fractional time at an
2631 appropriate resolution. */
2635 id_resolution = (BASE_62 == 62)? 500 : 1000;
2636 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2637 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2640 /* Add the current message id onto the current process info string if
2643 (void)string_format(process_info + process_info_len,
2644 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2646 /* If we are using multiple input directories, set up the one for this message
2647 to be the least significant base-62 digit of the time of arrival. Otherwise
2648 ensure that it is an empty string. */
2650 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2652 /* Now that we have the message-id, if there is no message-id: header, generate
2653 one, but only for local (without suppress_local_fixups) or submission mode
2654 messages. This can be user-configured if required, but we had better flatten
2655 any illegal characters therein. */
2658 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2661 uschar *id_text = US"";
2662 uschar *id_domain = primary_hostname;
2664 /* Permit only letters, digits, dots, and hyphens in the domain */
2666 if (message_id_domain)
2668 uschar *new_id_domain = expand_string(message_id_domain);
2671 if (!expand_string_forcedfail)
2672 log_write(0, LOG_MAIN|LOG_PANIC,
2673 "expansion of \"%s\" (message_id_header_domain) "
2674 "failed: %s", message_id_domain, expand_string_message);
2676 else if (*new_id_domain)
2678 id_domain = new_id_domain;
2679 for (p = id_domain; *p; p++)
2680 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2684 /* Permit all characters except controls and RFC 2822 specials in the
2685 additional text part. */
2687 if (message_id_text)
2689 uschar *new_id_text = expand_string(message_id_text);
2692 if (!expand_string_forcedfail)
2693 log_write(0, LOG_MAIN|LOG_PANIC,
2694 "expansion of \"%s\" (message_id_header_text) "
2695 "failed: %s", message_id_text, expand_string_message);
2697 else if (*new_id_text)
2699 id_text = new_id_text;
2700 for (p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2704 /* Add the header line
2705 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2706 * appended, to preserve classical expectations of header ordering. */
2708 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2709 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2710 (*id_text == 0)? "" : ".", id_text, id_domain);
2713 /* If we are to log recipients, keep a copy of the raw ones before any possible
2714 rewriting. Must copy the count, because later ACLs and the local_scan()
2715 function may mess with the real recipients. */
2717 if (LOGGING(received_recipients))
2719 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2720 for (i = 0; i < recipients_count; i++)
2721 raw_recipients[i] = string_copy(recipients_list[i].address);
2722 raw_recipients_count = recipients_count;
2725 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2726 recipients will get here only if the conditions were right (allow_unqualified_
2727 recipient is TRUE). */
2729 for (i = 0; i < recipients_count; i++)
2730 recipients_list[i].address =
2731 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2732 global_rewrite_rules, rewrite_existflags);
2734 /* If there is no From: header, generate one for local (without
2735 suppress_local_fixups) or submission_mode messages. If there is no sender
2736 address, but the sender is local or this is a local delivery error, use the
2737 originator login. This shouldn't happen for genuine bounces, but might happen
2738 for autoreplies. The addition of From: must be done *before* checking for the
2739 possible addition of a Sender: header, because untrusted_set_sender allows an
2740 untrusted user to set anything in the envelope (which might then get info
2741 From:) but we still want to ensure a valid Sender: if it is required. */
2744 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2746 uschar *oname = US"";
2748 /* Use the originator_name if this is a locally submitted message and the
2749 caller is not trusted. For trusted callers, use it only if -F was used to
2750 force its value or if we have a non-SMTP message for which -f was not used
2751 to set the sender. */
2753 if (!sender_host_address)
2755 if (!trusted_caller || sender_name_forced ||
2756 (!smtp_input && !sender_address_forced))
2757 oname = originator_name;
2760 /* For non-locally submitted messages, the only time we use the originator
2761 name is when it was forced by the /name= option on control=submission. */
2763 else if (submission_name) oname = submission_name;
2765 /* Envelope sender is empty */
2767 if (!*sender_address)
2769 uschar *fromstart, *fromend;
2771 fromstart = string_sprintf("%sFrom: %s%s",
2772 resent_prefix, oname, *oname ? " <" : "");
2773 fromend = *oname ? US">" : US"";
2775 if (sender_local || local_error_message)
2776 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2777 local_part_quote(originator_login), qualify_domain_sender,
2780 else if (submission_mode && authenticated_id)
2782 if (!submission_domain)
2783 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2784 local_part_quote(authenticated_id), qualify_domain_sender,
2787 else if (!*submission_domain) /* empty => whole address set */
2788 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2792 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2793 local_part_quote(authenticated_id), submission_domain, fromend);
2795 from_header = header_last; /* To get it checked for Sender: */
2799 /* There is a non-null envelope sender. Build the header using the original
2800 sender address, before any rewriting that might have been done while
2805 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2808 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2811 from_header = header_last; /* To get it checked for Sender: */
2816 /* If the sender is local (without suppress_local_fixups), or if we are in
2817 submission mode and there is an authenticated_id, check that an existing From:
2818 is correct, and if not, generate a Sender: header, unless disabled. Any
2819 previously-existing Sender: header was removed above. Note that sender_local,
2820 as well as being TRUE if the caller of exim is not trusted, is also true if a
2821 trusted caller did not supply a -f argument for non-smtp input. To allow
2822 trusted callers to forge From: without supplying -f, we have to test explicitly
2823 here. If the From: header contains more than one address, then the call to
2824 parse_extract_address fails, and a Sender: header is inserted, as required. */
2827 && ( active_local_from_check
2828 && ( sender_local && !trusted_caller && !suppress_local_fixups
2829 || submission_mode && authenticated_id
2832 BOOL make_sender = TRUE;
2833 int start, end, domain;
2835 uschar *from_address =
2836 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2837 &start, &end, &domain, FALSE);
2838 uschar *generated_sender_address;
2840 generated_sender_address = submission_mode
2841 ? !submission_domain
2842 ? string_sprintf("%s@%s",
2843 local_part_quote(authenticated_id), qualify_domain_sender)
2844 : !*submission_domain /* empty => full address */
2845 ? string_sprintf("%s", authenticated_id)
2846 : string_sprintf("%s@%s",
2847 local_part_quote(authenticated_id), submission_domain)
2848 : string_sprintf("%s@%s",
2849 local_part_quote(originator_login), qualify_domain_sender);
2851 /* Remove permitted prefixes and suffixes from the local part of the From:
2852 address before doing the comparison with the generated sender. */
2857 uschar *at = domain ? from_address + domain - 1 : NULL;
2860 from_address += route_check_prefix(from_address, local_from_prefix);
2861 slen = route_check_suffix(from_address, local_from_suffix);
2864 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2865 from_address += slen;
2869 if ( strcmpic(generated_sender_address, from_address) == 0
2870 || (!domain && strcmpic(from_address, originator_login) == 0))
2871 make_sender = FALSE;
2874 /* We have to cause the Sender header to be rewritten if there are
2875 appropriate rewriting rules. */
2878 if (submission_mode && !submission_name)
2879 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2880 generated_sender_address);
2882 header_add(htype_sender, "%sSender: %s <%s>\n",
2884 submission_mode? submission_name : originator_name,
2885 generated_sender_address);
2887 /* Ensure that a non-null envelope sender address corresponds to the
2888 submission mode sender address. */
2890 if (submission_mode && *sender_address)
2892 if (!sender_address_unrewritten)
2893 sender_address_unrewritten = sender_address;
2894 sender_address = generated_sender_address;
2895 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2896 log_write(L_address_rewrite, LOG_MAIN,
2897 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2898 sender_address_unrewritten, generated_sender_address);
2902 /* If there are any rewriting rules, apply them to the sender address, unless
2903 it has already been rewritten as part of verification for SMTP input. */
2905 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2907 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2908 global_rewrite_rules, rewrite_existflags);
2909 DEBUG(D_receive|D_rewrite)
2910 debug_printf("rewritten sender = %s\n", sender_address);
2914 /* The headers must be run through rewrite_header(), because it ensures that
2915 addresses are fully qualified, as well as applying any rewriting rules that may
2918 Qualification of header addresses in a message from a remote host happens only
2919 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2920 appropriate. For local messages, qualification always happens, unless -bnq is
2921 used to explicitly suppress it. No rewriting is done for an unqualified address
2922 that is left untouched.
2924 We start at the second header, skipping our own Received:. This rewriting is
2925 documented as happening *after* recipient addresses are taken from the headers
2926 by the -t command line option. An added Sender: gets rewritten here. */
2928 for (h = header_list->next; h; h = h->next)
2930 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2931 rewrite_existflags, TRUE);
2936 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2937 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2938 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2939 exists, this applies to the set of resent- headers rather than the normal set.
2941 The requirement for a recipient header has been removed in RFC 2822. At this
2942 point in the code, earlier versions of Exim added a To: header for locally
2943 submitted messages, and an empty Bcc: header for others. In the light of the
2944 changes in RFC 2822, this was dropped in November 2003. */
2947 /* If there is no date header, generate one if the message originates locally
2948 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2949 submission mode flag is set. Messages without Date: are not valid, but it seems
2950 to be more confusing if Exim adds one to all remotely-originated messages.
2951 As per Message-Id, we prepend if resending, else append.
2954 if ( !date_header_exists
2955 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2956 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2957 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2959 search_tidyup(); /* Free any cached resources */
2961 /* Show the complete set of headers if debugging. Note that the first one (the
2962 new Received:) has not yet been set. */
2966 debug_printf(">>Headers after rewriting and local additions:\n");
2967 for (h = header_list->next; h; h = h->next)
2968 debug_printf("%c %s", h->type, h->text);
2972 /* The headers are now complete in store. If we are running in filter
2973 testing mode, that is all this function does. Return TRUE if the message
2974 ended with a dot. */
2976 if (filter_test != FTEST_NONE)
2978 process_info[process_info_len] = 0;
2979 return message_ended == END_DOT;
2982 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2983 think more if it could be handled. Cannot do onward CHUNKING unless
2984 inbound is, but inbound chunking ought to be ok with outbound plain.
2985 Could we do onward CHUNKING given inbound CHUNKING?
2987 if (chunking_state > CHUNKING_OFFERED)
2988 cancel_cutthrough_connection(FALSE, US"chunking active");
2990 /* Cutthrough delivery:
2991 We have to create the Received header now rather than at the end of reception,
2992 so the timestamp behaviour is a change to the normal case.
2993 Having created it, send the headers to the destination. */
2995 if (cutthrough.fd >= 0 && cutthrough.delivery)
2997 if (received_count > received_headers_max)
2999 cancel_cutthrough_connection(TRUE, US"too many headers");
3000 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3001 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3002 "Too many \"Received\" headers",
3004 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3005 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3006 message_id[0] = 0; /* Indicate no message accepted */
3007 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3008 goto TIDYUP; /* Skip to end of function */
3010 received_header_gen();
3011 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3012 (void) cutthrough_headers_send();
3016 /* Open a new spool file for the data portion of the message. We need
3017 to access it both via a file descriptor and a stream. Try to make the
3018 directory if it isn't there. */
3020 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3021 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3023 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3025 if (errno == ENOENT)
3027 (void) directory_make(spool_directory,
3028 spool_sname(US"input", message_subdir),
3029 INPUT_DIRECTORY_MODE, TRUE);
3030 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3033 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3034 spool_name, strerror(errno));
3037 /* Make sure the file's group is the Exim gid, and double-check the mode
3038 because the group setting doesn't always get set automatically. */
3040 if (fchown(data_fd, exim_uid, exim_gid))
3041 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3042 "Failed setting ownership on spool file %s: %s",
3043 spool_name, strerror(errno));
3044 (void)fchmod(data_fd, SPOOL_MODE);
3046 /* We now have data file open. Build a stream for it and lock it. We lock only
3047 the first line of the file (containing the message ID) because otherwise there
3048 are problems when Exim is run under Cygwin (I'm told). See comments in
3049 spool_in.c, where the same locking is done. */
3051 data_file = fdopen(data_fd, "w+");
3052 lock_data.l_type = F_WRLCK;
3053 lock_data.l_whence = SEEK_SET;
3054 lock_data.l_start = 0;
3055 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3057 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3058 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3059 errno, strerror(errno));
3061 /* We have an open, locked data file. Write the message id to it to make it
3062 self-identifying. Then read the remainder of the input of this message and
3063 write it to the data file. If the variable next != NULL, it contains the first
3064 data line (which was read as a header but then turned out not to have the right
3065 format); write it (remembering that it might contain binary zeros). The result
3066 of fwrite() isn't inspected; instead we call ferror() below. */
3068 fprintf(data_file, "%s-D\n", message_id);
3071 uschar *s = next->text;
3072 int len = next->slen;
3073 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3074 body_linecount++; /* Assumes only 1 line */
3077 /* Note that we might already be at end of file, or the logical end of file
3078 (indicated by '.'), or might have encountered an error while writing the
3079 message id or "next" line. */
3081 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3085 message_ended = chunking_state <= CHUNKING_OFFERED
3086 ? read_message_data_smtp(data_file)
3088 ? read_message_bdat_smtp_wire(data_file)
3089 : read_message_bdat_smtp(data_file);
3090 receive_linecount++; /* The terminating "." line */
3092 else message_ended = read_message_data(data_file);
3094 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3095 message_linecount += body_linecount;
3097 switch (message_ended)
3099 /* Handle premature termination of SMTP */
3104 Uunlink(spool_name); /* Lose data file when closed */
3105 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3106 message_id[0] = 0; /* Indicate no message accepted */
3107 smtp_reply = handle_lost_connection(US"");
3109 goto TIDYUP; /* Skip to end of function */
3113 /* Handle message that is too big. Don't use host_or_ident() in the log
3114 message; we want to see the ident value even for non-remote messages. */
3117 Uunlink(spool_name); /* Lose the data file when closed */
3118 cancel_cutthrough_connection(TRUE, US"mail too big");
3119 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3121 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3122 "message too big: read=%d max=%d",
3124 sender_fullhost ? " H=" : "",
3125 sender_fullhost ? sender_fullhost : US"",
3126 sender_ident ? " U=" : "",
3127 sender_ident ? sender_ident : US"",
3129 thismessage_size_limit);
3133 smtp_reply = US"552 Message size exceeds maximum permitted";
3134 message_id[0] = 0; /* Indicate no message accepted */
3135 goto TIDYUP; /* Skip to end of function */
3139 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3140 give_local_error(ERRMESS_TOOBIG,
3141 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3142 US"message rejected: ", error_rc, data_file, header_list);
3143 /* Does not return */
3147 /* Handle bad BDAT protocol sequence */
3150 Uunlink(spool_name); /* Lose the data file when closed */
3151 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3152 smtp_reply = US""; /* Response already sent */
3153 message_id[0] = 0; /* Indicate no message accepted */
3154 goto TIDYUP; /* Skip to end of function */
3158 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3159 example, there may be some expansion in an ACL that uses a timer.) */
3161 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3163 /* The message body has now been read into the data file. Call fflush() to
3164 empty the buffers in C, and then call fsync() to get the data written out onto
3165 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3166 having to do this). If there was an I/O error on either input or output,
3167 attempt to send an error message, and unlink the spool file. For non-SMTP input
3168 we can then give up. Note that for SMTP input we must swallow the remainder of
3169 the input in cases of output errors, since the far end doesn't expect to see
3170 anything until the terminating dot line is sent. */
3172 if (fflush(data_file) == EOF || ferror(data_file) ||
3173 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3175 uschar *msg_errno = US strerror(errno);
3176 BOOL input_error = (receive_ferror)() != 0;
3177 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3178 input_error? "Input read" : "Spool write",
3180 sender_fullhost ? sender_fullhost : sender_ident);
3182 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3183 Uunlink(spool_name); /* Lose the data file */
3184 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3189 smtp_reply = US"451 Error while reading input data";
3192 smtp_reply = US"451 Error while writing spool file";
3193 receive_swallow_smtp();
3195 message_id[0] = 0; /* Indicate no message accepted */
3196 goto TIDYUP; /* Skip to end of function */
3201 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3202 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3204 /* Does not return */
3209 /* No I/O errors were encountered while writing the data file. */
3211 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3212 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3215 /* If there were any bad addresses extracted by -t, or there were no recipients
3216 left after -t, send a message to the sender of this message, or write it to
3217 stderr if the error handling option is set that way. Note that there may
3218 legitimately be no recipients for an SMTP message if they have all been removed
3221 We need to rewind the data file in order to read it. In the case of no
3222 recipients or stderr error writing, throw the data file away afterwards, and
3223 exit. (This can't be SMTP, which always ensures there's at least one
3224 syntactically good recipient address.) */
3226 if (extract_recip && (bad_addresses || recipients_count == 0))
3230 if (recipients_count == 0) debug_printf("*** No recipients\n");
3233 error_block *eblock = bad_addresses;
3234 debug_printf("*** Bad address(es)\n");
3235 while (eblock != NULL)
3237 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3238 eblock = eblock->next;
3243 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3245 /* If configured to send errors to the sender, but this fails, force
3246 a failure error code. We use a special one for no recipients so that it
3247 can be detected by the autoreply transport. Otherwise error_rc is set to
3248 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3249 it is EXIT_SUCCESS. */
3251 if (error_handling == ERRORS_SENDER)
3253 if (!moan_to_sender(
3254 (bad_addresses == NULL)?
3255 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3256 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3257 bad_addresses, header_list, data_file, FALSE))
3258 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3264 if (extracted_ignored)
3265 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3267 fprintf(stderr, "exim: no recipients in message\n");
3271 fprintf(stderr, "exim: invalid address%s",
3272 (bad_addresses->next == NULL)? ":" : "es:\n");
3273 while (bad_addresses != NULL)
3275 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3276 bad_addresses->text2);
3277 bad_addresses = bad_addresses->next;
3282 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3284 Uunlink(spool_name);
3285 (void)fclose(data_file);
3286 exim_exit(error_rc, US"receiving");
3290 /* Data file successfully written. Generate text for the Received: header by
3291 expanding the configured string, and adding a timestamp. By leaving this
3292 operation till now, we ensure that the timestamp is the time that message
3293 reception was completed. However, this is deliberately done before calling the
3294 data ACL and local_scan().
3296 This Received: header may therefore be inspected by the data ACL and by code in
3297 the local_scan() function. When they have run, we update the timestamp to be
3298 the final time of reception.
3300 If there is just one recipient, set up its value in the $received_for variable
3301 for use when we generate the Received: header.
3303 Note: the checking for too many Received: headers is handled by the delivery
3305 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3307 if (!received_header->text) /* Non-cutthrough case */
3309 received_header_gen();
3311 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3313 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3314 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3316 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3317 now, before running the DATA ACL. */
3319 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3322 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3323 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3325 /* If an ACL is specified for checking things at this stage of reception of a
3326 message, run it, unless all the recipients were removed by "discard" in earlier
3327 ACLs. That is the only case in which recipients_count can be zero at this
3328 stage. Set deliver_datafile to point to the data file so that $message_body and
3329 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3332 deliver_datafile = data_fd;
3335 enable_dollar_recipients = TRUE;
3337 if (recipients_count == 0)
3338 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3342 /* Handle interactive SMTP messages */
3344 if (smtp_input && !smtp_batched_input)
3347 #ifndef DISABLE_DKIM
3348 if (!dkim_disable_verify)
3350 /* Finish verification */
3351 dkim_exim_verify_finish();
3353 /* Check if we must run the DKIM ACL */
3354 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3356 uschar * dkim_verify_signers_expanded =
3357 expand_string(dkim_verify_signers);
3358 gstring * results = NULL;
3362 gstring * seen_items = NULL;
3363 int old_pool = store_pool;
3365 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3367 if (!(ptr = dkim_verify_signers_expanded))
3368 log_write(0, LOG_MAIN|LOG_PANIC,
3369 "expansion of dkim_verify_signers option failed: %s",
3370 expand_string_message);
3372 /* Default to OK when no items are present */
3374 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3376 /* Prevent running ACL for an empty item */
3377 if (!item || !*item) continue;
3379 /* Only run ACL once for each domain or identity,
3380 no matter how often it appears in the expanded list. */
3384 const uschar * seen_items_list = string_from_gstring(seen_items);
3386 BOOL seen_this_item = FALSE;
3388 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3390 if (Ustrcmp(seen_item,item) == 0)
3392 seen_this_item = TRUE;
3399 debug_printf("acl_smtp_dkim: skipping signer %s, "
3400 "already seen\n", item);
3404 seen_items = string_catn(seen_items, US":", 1);
3406 seen_items = string_cat(seen_items, item);
3408 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3412 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3413 "skipping remaining items\n", rc, item);
3414 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3418 dkim_verify_status = string_from_gstring(results);
3419 store_pool = old_pool;
3420 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3423 recipients_count = 0;
3424 blackholed_by = US"DKIM ACL";
3426 blackhole_log_msg = string_sprintf(": %s", log_msg);
3430 Uunlink(spool_name);
3431 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3432 smtp_yield = FALSE; /* No more messages after dropped connection */
3433 smtp_reply = US""; /* Indicate reply already sent */
3434 message_id[0] = 0; /* Indicate no message accepted */
3435 goto TIDYUP; /* Skip to end of function */
3439 dkim_exim_verify_log_all();
3441 #endif /* DISABLE_DKIM */
3443 #ifdef WITH_CONTENT_SCAN
3444 if ( recipients_count > 0
3446 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3449 #endif /* WITH_CONTENT_SCAN */
3451 #ifdef EXPERIMENTAL_DMARC
3452 dmarc_up = dmarc_store_data(from_header);
3453 #endif /* EXPERIMENTAL_DMARC */
3455 #ifndef DISABLE_PRDR
3456 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3460 int all_fail = FAIL;
3462 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3463 /* Loop through recipients, responses must be in same order received */
3464 for (c = 0; recipients_count > c; c++)
3466 uschar * addr= recipients_list[c].address;
3467 uschar * msg= US"PRDR R=<%s> %s";
3470 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3471 addr, c+1, recipients_count);
3472 rc = acl_check(ACL_WHERE_PRDR, addr,
3473 acl_smtp_data_prdr, &user_msg, &log_msg);
3475 /* If any recipient rejected content, indicate it in final message */
3477 /* If all recipients rejected, indicate in final message */
3482 case OK: case DISCARD: code = US"250"; break;
3483 case DEFER: code = US"450"; break;
3484 default: code = US"550"; break;
3486 if (user_msg != NULL)
3487 smtp_user_msg(code, user_msg);
3492 case OK: case DISCARD:
3493 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3495 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3497 msg = string_sprintf(CS msg, addr, "refusal"); break;
3499 smtp_user_msg(code, msg);
3501 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3502 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3503 else log_write(0, LOG_MAIN, "%s", CS msg);
3505 if (rc != OK) { receive_remove_recipient(addr); c--; }
3507 /* Set up final message, used if data acl gives OK */
3508 smtp_reply = string_sprintf("%s id=%s message %s",
3509 all_fail == FAIL ? US"550" : US"250",
3512 ? US"rejected for all recipients"
3515 : US"accepted for some recipients");
3516 if (recipients_count == 0)
3518 message_id[0] = 0; /* Indicate no message accepted */
3523 prdr_requested = FALSE;
3524 #endif /* !DISABLE_PRDR */
3526 /* Check the recipients count again, as the MIME ACL might have changed
3529 if (acl_smtp_data != NULL && recipients_count > 0)
3531 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3532 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3535 recipients_count = 0;
3536 blackholed_by = US"DATA ACL";
3538 blackhole_log_msg = string_sprintf(": %s", log_msg);
3539 cancel_cutthrough_connection(TRUE, US"data acl discard");
3543 Uunlink(spool_name);
3544 cancel_cutthrough_connection(TRUE, US"data acl not ok");
3545 #ifdef WITH_CONTENT_SCAN
3548 #ifdef EXPERIMENTAL_DCC
3551 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3552 smtp_yield = FALSE; /* No more messages after dropped connection */
3553 smtp_reply = US""; /* Indicate reply already sent */
3554 message_id[0] = 0; /* Indicate no message accepted */
3555 goto TIDYUP; /* Skip to end of function */
3560 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3561 we cannot take different actions for permanent and temporary rejections. */
3566 #ifdef WITH_CONTENT_SCAN
3567 if ( acl_not_smtp_mime
3568 && !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3572 #endif /* WITH_CONTENT_SCAN */
3576 uschar *user_msg, *log_msg;
3577 authentication_local = TRUE;
3578 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3581 recipients_count = 0;
3582 blackholed_by = US"non-SMTP ACL";
3584 blackhole_log_msg = string_sprintf(": %s", log_msg);
3588 Uunlink(spool_name);
3589 #ifdef WITH_CONTENT_SCAN
3592 #ifdef EXPERIMENTAL_DCC
3595 /* The ACL can specify where rejections are to be logged, possibly
3596 nowhere. The default is main and reject logs. */
3598 if (log_reject_target)
3599 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3600 sender_address, log_msg);
3602 if (!user_msg) user_msg = US"local configuration problem";
3603 if (smtp_batched_input)
3605 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3606 /* Does not return */
3610 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3611 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3612 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3614 /* Does not return */
3617 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3621 /* The applicable ACLs have been run */
3623 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3624 if (queue_only_policy) queued_by = US"ACL";
3627 #ifdef WITH_CONTENT_SCAN
3631 #ifdef EXPERIMENTAL_DCC
3636 /* The final check on the message is to run the scan_local() function. The
3637 version supplied with Exim always accepts, but this is a hook for sysadmins to
3638 supply their own checking code. The local_scan() function is run even when all
3639 the recipients have been discarded. */
3641 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3643 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3644 deleted, and the incident gets logged. */
3646 if (sigsetjmp(local_scan_env, 1) == 0)
3648 had_local_scan_crash = 0;
3649 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3650 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3651 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3652 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3654 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3655 local_scan_timeout);
3656 local_scan_data = NULL;
3658 had_local_scan_timeout = 0;
3659 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3660 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3661 rc = local_scan(data_fd, &local_scan_data);
3663 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3665 enable_dollar_recipients = FALSE;
3667 store_pool = POOL_MAIN; /* In case changed */
3668 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3671 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3672 os_non_restarting_signal(SIGFPE, SIG_DFL);
3673 os_non_restarting_signal(SIGILL, SIG_DFL);
3674 os_non_restarting_signal(SIGBUS, SIG_DFL);
3678 if (had_local_scan_crash)
3680 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
3681 "signal %d - message temporarily rejected (size %d)",
3682 had_local_scan_crash, message_size);
3683 /* Does not return */
3684 receive_bomb_out(US"local-scan-error", US"local verification problem");
3686 if (had_local_scan_timeout)
3688 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
3689 "message temporarily rejected (size %d)", message_size);
3690 /* Does not return */
3691 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
3695 /* The length check is paranoia against some runaway code, and also because
3696 (for a success return) lines in the spool file are read into big_buffer. */
3698 if (local_scan_data)
3700 int len = Ustrlen(local_scan_data);
3701 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3702 local_scan_data = string_copyn(local_scan_data, len);
3705 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3707 if (!deliver_freeze) /* ACL might have already frozen */
3709 deliver_freeze = TRUE;
3710 deliver_frozen_at = time(NULL);
3711 frozen_by = US"local_scan()";
3713 rc = LOCAL_SCAN_ACCEPT;
3715 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3717 if (!queue_only_policy) /* ACL might have already queued */
3719 queue_only_policy = TRUE;
3720 queued_by = US"local_scan()";
3722 rc = LOCAL_SCAN_ACCEPT;
3725 /* Message accepted: remove newlines in local_scan_data because otherwise
3726 the spool file gets corrupted. Ensure that all recipients are qualified. */
3728 if (rc == LOCAL_SCAN_ACCEPT)
3730 if (local_scan_data)
3733 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3735 for (i = 0; i < recipients_count; i++)
3737 recipient_item *r = recipients_list + i;
3738 r->address = rewrite_address_qualify(r->address, TRUE);
3739 if (r->errors_to != NULL)
3740 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3742 if (recipients_count == 0 && blackholed_by == NULL)
3743 blackholed_by = US"local_scan";
3746 /* Message rejected: newlines permitted in local_scan_data to generate
3747 multiline SMTP responses. */
3751 uschar *istemp = US"";
3755 errmsg = local_scan_data;
3757 Uunlink(spool_name); /* Cancel this message */
3761 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3762 "rejection given", rc);
3765 case LOCAL_SCAN_REJECT_NOLOGHDR:
3766 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3769 case LOCAL_SCAN_REJECT:
3770 smtp_code = US"550";
3771 if (!errmsg) errmsg = US"Administrative prohibition";
3774 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3775 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3778 case LOCAL_SCAN_TEMPREJECT:
3780 smtp_code = US"451";
3781 if (!errmsg) errmsg = US"Temporary local problem";
3782 istemp = US"temporarily ";
3786 g = string_append(NULL, 2, US"F=",
3787 sender_address[0] == 0 ? US"<>" : sender_address);
3788 g = add_host_info_for_log(g);
3790 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3791 string_from_gstring(g), istemp, string_printing(errmsg));
3795 if (!smtp_batched_input)
3797 smtp_respond(smtp_code, 3, TRUE, errmsg);
3798 message_id[0] = 0; /* Indicate no message accepted */
3799 smtp_reply = US""; /* Indicate reply already sent */
3800 goto TIDYUP; /* Skip to end of function */
3804 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3805 /* Does not return */
3810 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3811 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3812 US"message rejected by local scan code: ", error_rc, data_file,
3814 /* Does not return */
3818 /* Reset signal handlers to ignore signals that previously would have caused
3819 the message to be abandoned. */
3821 signal(SIGTERM, SIG_IGN);
3822 signal(SIGINT, SIG_IGN);
3825 /* Ensure the first time flag is set in the newly-received message. */
3827 deliver_firsttime = TRUE;
3829 #ifdef EXPERIMENTAL_BRIGHTMAIL
3831 { /* rewind data file */
3832 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3833 bmi_verdicts = bmi_process_message(header_list, data_fd);
3837 /* Update the timestamp in our Received: header to account for any time taken by
3838 an ACL or by local_scan(). The new time is the time that all reception
3839 processing is complete. */
3841 timestamp = expand_string(US"${tod_full}");
3842 tslen = Ustrlen(timestamp);
3844 memcpy(received_header->text + received_header->slen - tslen - 1,
3847 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3851 deliver_freeze = FALSE;
3852 queue_only_policy = FALSE;
3855 /* Keep the data file open until we have written the header file, in order to
3856 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3857 don't write the header file, and we unlink the data file. If writing the header
3858 file fails, we have failed to accept this message. */
3860 if (host_checking || blackholed_by != NULL)
3863 Uunlink(spool_name);
3864 msg_size = 0; /* Compute size for log line */
3865 for (h = header_list; h != NULL; h = h->next)
3866 if (h->type != '*') msg_size += h->slen;
3869 /* Write the -H file */
3872 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3874 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3875 Uunlink(spool_name); /* Lose the data file */
3879 smtp_reply = US"451 Error in writing spool file";
3880 message_id[0] = 0; /* Indicate no message accepted */
3885 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3886 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3888 /* Does not return */
3893 /* The message has now been successfully received. */
3895 receive_messagecount++;
3897 /* In SMTP sessions we may receive several in one connection. After each one,
3898 we wait for the clock to tick at the level of message-id granularity. This is
3899 so that the combination of time+pid is unique, even on systems where the pid
3900 can be re-used within our time interval. We can't shorten the interval without
3901 re-designing the message-id. See comments above where the message id is
3902 created. This is Something For The Future. */
3904 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3905 exim_wait_tick(&message_id_tv, id_resolution);
3907 /* Add data size to written header size. We do not count the initial file name
3908 that is in the file, but we do add one extra for the notional blank line that
3909 precedes the data. This total differs from message_size in that it include the
3910 added Received: header and any other headers that got created locally. */
3913 fstat(data_fd, &statbuf);
3915 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3917 /* Generate a "message received" log entry. We do this by building up a dynamic
3918 string as required. Since we commonly want to add two items at a time, use a
3919 macro to simplify the coding. We log the arrival of a new message while the
3920 file is still locked, just in case the machine is *really* fast, and delivers
3921 it first! Include any message id that is in the message - since the syntax of a
3922 message id is actually an addr-spec, we can use the parse routine to canonicalize
3925 g = string_get(256);
3927 g = string_append(g, 2,
3928 fake_response == FAIL ? US"(= " : US"<= ",
3929 sender_address[0] == 0 ? US"<>" : sender_address);
3930 if (message_reference)
3931 g = string_append(g, 2, US" R=", message_reference);
3933 g = add_host_info_for_log(g);
3936 if (LOGGING(tls_cipher) && tls_in.cipher)
3937 g = string_append(g, 2, US" X=", tls_in.cipher);
3938 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3939 g = string_append(g, 2, US" CV=", tls_in.certificate_verified ? "yes":"no");
3940 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3941 g = string_append(g, 3, US" DN=\"", string_printing(tls_in.peerdn), US"\"");
3942 if (LOGGING(tls_sni) && tls_in.sni)
3943 g = string_append(g, 3, US" SNI=\"", string_printing(tls_in.sni), US"\"");
3946 if (sender_host_authenticated)
3948 g = string_append(g, 2, US" A=", sender_host_authenticated);
3949 if (authenticated_id)
3951 g = string_append(g, 2, US":", authenticated_id);
3952 if (LOGGING(smtp_mailauth) && authenticated_sender)
3953 g = string_append(g, 2, US":", authenticated_sender);
3957 #ifndef DISABLE_PRDR
3959 g = string_catn(g, US" PRDR", 5);
3962 #ifdef SUPPORT_PROXY
3963 if (proxy_session && LOGGING(proxy))
3964 g = string_append(g, 2, US" PRX=", proxy_local_address);
3967 if (chunking_state > CHUNKING_OFFERED)
3968 g = string_catn(g, US" K", 2);
3970 sprintf(CS big_buffer, "%d", msg_size);
3971 g = string_append(g, 2, US" S=", big_buffer);
3973 /* log 8BITMIME mode announced in MAIL_FROM
3977 if (LOGGING(8bitmime))
3979 sprintf(CS big_buffer, "%d", body_8bitmime);
3980 g = string_append(g, 2, US" M8S=", big_buffer);
3983 #ifndef DISABLE_DKIM
3984 if (LOGGING(dkim) && dkim_verify_overall)
3985 g = string_append(g, 2, US" DKIM=", dkim_verify_overall);
3986 # ifdef EXPERIMENTAL_ARC
3987 if (LOGGING(dkim) && arc_state && Ustrcmp(arc_state, "pass") == 0)
3988 g = string_catn(g, US" ARC", 4);
3992 if (LOGGING(receive_time))
3993 g = string_append(g, 2, US" RT=", string_timediff(&received_time_taken));
3996 g = string_append(g, 2, US" Q=", queue_name);
3998 /* If an addr-spec in a message-id contains a quoted string, it can contain
3999 any characters except " \ and CR and so in particular it can contain NL!
4000 Therefore, make sure we use a printing-characters only version for the log.
4001 Also, allow for domain literals in the message id. */
4006 BOOL save_allow_domain_literals = allow_domain_literals;
4007 allow_domain_literals = TRUE;
4008 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
4009 &errmsg, &start, &end, &domain, FALSE);
4010 allow_domain_literals = save_allow_domain_literals;
4012 g = string_append(g, 2, US" id=", string_printing(old_id));
4015 /* If subject logging is turned on, create suitable printing-character
4016 text. By expanding $h_subject: we make use of the MIME decoding. */
4018 if (LOGGING(subject) && subject_header)
4021 uschar *p = big_buffer;
4022 uschar *ss = expand_string(US"$h_subject:");
4024 /* Backslash-quote any double quotes or backslashes so as to make a
4025 a C-like string, and turn any non-printers into escape sequences. */
4028 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
4030 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
4035 g = string_append(g, 2, US" T=", string_printing(big_buffer));
4038 /* Terminate the string: string_cat() and string_append() leave room, but do
4039 not put the zero in. */
4041 (void) string_from_gstring(g);
4043 /* Create a message log file if message logs are being used and this message is
4044 not blackholed. Write the reception stuff to it. We used to leave message log
4045 creation until the first delivery, but this has proved confusing for some
4048 if (message_logs && !blackholed_by)
4052 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
4054 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4058 (void)directory_make(spool_directory,
4059 spool_sname(US"msglog", message_subdir),
4060 MSGLOG_DIRECTORY_MODE, TRUE);
4061 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4065 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4066 spool_name, strerror(errno));
4069 FILE *message_log = fdopen(fd, "a");
4070 if (message_log == NULL)
4072 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4073 spool_name, strerror(errno));
4078 uschar *now = tod_stamp(tod_log);
4079 fprintf(message_log, "%s Received from %s\n", now, g->s+3);
4080 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4082 if (queue_only_policy) fprintf(message_log,
4083 "%s no immediate delivery: queued%s%s by %s\n", now,
4084 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4086 (void)fclose(message_log);
4091 /* Everything has now been done for a successful message except logging its
4092 arrival, and outputting an SMTP response. While writing to the log, set a flag
4093 to cause a call to receive_bomb_out() if the log cannot be opened. */
4095 receive_call_bombout = TRUE;
4097 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4098 connection has gone away. This can only be done if there is no unconsumed input
4099 waiting in the local input buffer. We can test for this by calling
4100 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4101 input to be sent following the final dot, so the presence of following input is
4104 If the connection is still present, but there is no unread input for the
4105 socket, the result of a select() call will be zero. If, however, the connection
4106 has gone away, or if there is pending input, the result of select() will be
4107 non-zero. The two cases can be distinguished by trying to read the next input
4108 character. If we succeed, we can unread it so that it remains in the local
4109 buffer for handling later. If not, the connection has been lost.
4111 Of course, since TCP/IP is asynchronous, there is always a chance that the
4112 connection will vanish between the time of this test and the sending of the
4113 response, but the chance of this happening should be small. */
4115 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
4116 !receive_smtp_buffered())
4119 fd_set select_check;
4120 FD_ZERO(&select_check);
4121 FD_SET(fileno(smtp_in), &select_check);
4125 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4127 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4128 if (c != EOF) (receive_ungetc)(c); else
4130 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4131 smtp_reply = US""; /* No attempt to send a response */
4132 smtp_yield = FALSE; /* Nothing more on this connection */
4134 /* Re-use the log line workspace */
4137 g = string_cat(g, US"SMTP connection lost after final dot");
4138 g = add_host_info_for_log(g);
4139 log_write(0, LOG_MAIN, "%s", string_from_gstring(g));
4141 /* Delete the files for this aborted message. */
4143 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4144 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4145 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4152 /* The connection has not gone away; we really are going to take responsibility
4153 for this message. */
4155 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4158 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4159 the sender's dot (below).
4160 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4161 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4162 in which case pass temp-reject back to initiator and dump the files.
4164 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4166 XXX We do not handle queue-only, freezing, or blackholes.
4168 if(cutthrough.fd >= 0 && cutthrough.delivery)
4170 uschar * msg = cutthrough_finaldot(); /* Ask the target system to accept the message */
4171 /* Logging was done in finaldot() */
4174 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4175 cutthrough_done = ACCEPTED;
4176 break; /* message_id needed for SMTP accept below */
4178 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4179 ... for which, pass back the exact error */
4180 if (cutthrough.defer_pass) smtp_reply = string_copy_malloc(msg);
4181 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4182 break; /* message_id needed for SMTP accept below */
4184 default: /* Unknown response, or error. Treat as temp-reject. */
4185 if (cutthrough.defer_pass) smtp_reply = US"450 Onward transmission not accepted";
4186 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4187 break; /* message_id needed for SMTP accept below */
4189 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4190 smtp_reply = string_copy_malloc(msg); /* Pass on the exact error */
4191 cutthrough_done = PERM_REJ;
4196 #ifndef DISABLE_PRDR
4197 if(!smtp_reply || prdr_requested)
4202 log_write(0, LOG_MAIN |
4203 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4204 (LOGGING(received_sender)? LOG_SENDER : 0),
4207 /* Log any control actions taken by an ACL or local_scan(). */
4209 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4210 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4211 "no immediate delivery: queued%s%s by %s",
4212 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4215 receive_call_bombout = FALSE;
4217 store_reset(g); /* The store for the main log message can be reused */
4219 /* If the message is frozen, and freeze_tell is set, do the telling. */
4221 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4223 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4224 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4225 message_id, frozen_by, sender_address);
4229 /* Either a message has been successfully received and written to the two spool
4230 files, or an error in writing the spool has occurred for an SMTP message, or
4231 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4232 we will have already given up because there's no point in carrying on!) In
4233 either event, we must now close (and thereby unlock) the data file. In the
4234 successful case, this leaves the message on the spool, ready for delivery. In
4235 the error case, the spool file will be deleted. Then tidy up store, interact
4236 with an SMTP call if necessary, and return.
4238 A fflush() was done earlier in the expectation that any write errors on the
4239 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4240 possible for fclose() to fail - but what to do? What has happened to the lock
4245 process_info[process_info_len] = 0; /* Remove message id */
4246 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4248 /* Now reset signal handlers to their defaults */
4250 signal(SIGTERM, SIG_DFL);
4251 signal(SIGINT, SIG_DFL);
4253 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4254 value, which defaults TRUE - meaning there may be more incoming messages from
4255 this connection. For non-SMTP callers (where there is only ever one message),
4256 the default is FALSE. */
4262 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4263 is set to the response that should be sent. When it is NULL, we generate
4264 default responses. After an ACL error or local_scan() error, the response has
4265 already been sent, and smtp_reply is an empty string to indicate this. */
4267 if (!smtp_batched_input)
4271 if (fake_response != OK)
4272 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4273 3, TRUE, fake_response_text);
4275 /* An OK response is required; use "message" text if present. */
4279 uschar *code = US"250";
4281 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4282 smtp_respond(code, len, TRUE, user_msg);
4285 /* Default OK response */
4287 else if (chunking_state > CHUNKING_OFFERED)
4289 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n", FALSE,
4290 chunking_datasize, message_size+message_linecount, message_id);
4291 chunking_state = CHUNKING_OFFERED;
4294 smtp_printf("250 OK id=%s\r\n", FALSE, message_id);
4298 "\n**** SMTP testing: that is not a real message id!\n\n");
4301 /* smtp_reply is set non-empty */
4303 else if (smtp_reply[0] != 0)
4304 if (fake_response != OK && (smtp_reply[0] == '2'))
4305 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4306 fake_response_text);
4308 smtp_printf("%.1024s\r\n", FALSE, smtp_reply);
4310 switch (cutthrough_done)
4313 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4315 /* Delete spool files */
4316 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4317 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4318 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4322 if (cutthrough.defer_pass)
4324 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4325 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4326 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4331 if (cutthrough_done != NOT_TRIED)
4333 message_id[0] = 0; /* Prevent a delivery from starting */
4334 cutthrough.delivery = cutthrough.callout_hold_only = FALSE;
4335 cutthrough.defer_pass = FALSE;
4339 /* For batched SMTP, generate an error message on failure, and do
4340 nothing on success. The function moan_smtp_batch() does not return -
4341 it exits from the program with a non-zero return code. */
4343 else if (smtp_reply)
4344 moan_smtp_batch(NULL, "%s", smtp_reply);
4348 /* If blackholing, we can immediately log this message's sad fate. The data
4349 file has already been unlinked, and the header file was never written to disk.
4350 We must now indicate that nothing was received, to prevent a delivery from
4355 const uschar *detail =
4356 local_scan_data ? string_printing(local_scan_data) :
4357 string_sprintf("(%s discarded recipients)", blackholed_by);
4358 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4359 log_write(0, LOG_MAIN, "Completed");
4363 /* Reset headers so that logging of rejects for a subsequent message doesn't
4364 include them. It is also important to set header_last = NULL before exiting
4365 from this function, as this prevents certain rewrites that might happen during
4366 subsequent verifying (of another incoming message) from trying to add headers
4367 when they shouldn't. */
4369 header_list = header_last = NULL;
4371 return yield; /* TRUE if more messages (SMTP only) */
4374 /* End of receive.c */