1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Code for receiving a message and setting up spool files. */
12 #ifdef EXPERIMENTAL_DCC
16 #ifdef EXPERIMENTAL_DMARC
18 #endif /* EXPERIMENTAL_DMARC */
20 /*************************************************
21 * Local static variables *
22 *************************************************/
24 static FILE *data_file = NULL;
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
30 /*************************************************
31 * Non-SMTP character reading functions *
32 *************************************************/
34 /* These are the default functions that are set up in the variables such as
35 receive_getc initially. They just call the standard functions, passing stdin as
36 the file. (When SMTP input is occurring, different functions are used by
37 changing the pointer variables.) */
40 stdin_getc(unsigned lim)
48 return ungetc(c, stdin);
66 /*************************************************
67 * Check that a set sender is allowed *
68 *************************************************/
70 /* This function is called when a local caller sets an explicit sender address.
71 It checks whether this is permitted, which it is for trusted callers.
72 Otherwise, it must match the pattern(s) in untrusted_set_sender.
74 Arguments: the proposed sender address
75 Returns: TRUE for a trusted caller
76 TRUE if the address has been set, untrusted_set_sender has been
77 set, and the address matches something in the list
82 receive_check_set_sender(uschar *newsender)
85 if (trusted_caller) return TRUE;
86 if (newsender == NULL || untrusted_set_sender == NULL) return FALSE;
87 qnewsender = (Ustrchr(newsender, '@') != NULL)?
88 newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
90 match_address_list(qnewsender, TRUE, TRUE, CUSS &untrusted_set_sender, NULL, -1,
97 /*************************************************
98 * Read space info for a partition *
99 *************************************************/
101 /* This function is called by receive_check_fs() below, and also by string
102 expansion for variables such as $spool_space. The field names for the statvfs
103 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
104 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
105 have inodes, and they return -1 for the number available.
107 Later: It turns out that some file systems that do not have the concept of
108 inodes return 0 rather than -1. Such systems should also return 0 for the total
109 number of inodes, so we require that to be greater than zero before returning
113 isspool TRUE for spool partition, FALSE for log partition
114 inodeptr address of int to receive inode count; -1 if there isn't one
116 Returns: available on-root space, in kilobytes
117 -1 for log partition if there isn't one
119 All values are -1 if the STATFS functions are not available.
123 receive_statvfs(BOOL isspool, int *inodeptr)
126 struct STATVFS statbuf;
132 /* The spool directory must always exist. */
136 path = spool_directory;
140 /* Need to cut down the log file path to the directory, and to ignore any
141 appearance of "syslog" in it. */
145 int sep = ':'; /* Not variable - outside scripts use */
146 const uschar *p = log_file_path;
149 /* An empty log_file_path means "use the default". This is the same as an
150 empty item in a list. */
152 if (*p == 0) p = US":";
153 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
154 if (Ustrcmp(path, "syslog") != 0)
157 if (path == NULL) /* No log files */
163 /* An empty string means use the default, which is in the spool directory.
164 But don't just use the spool directory, as it is possible that the log
165 subdirectory has been symbolically linked elsewhere. */
169 sprintf(CS buffer, CS"%s/log", CS spool_directory);
175 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
179 /* We now have the path; do the business */
181 memset(&statbuf, 0, sizeof(statbuf));
183 if (STATVFS(CS path, &statbuf) != 0)
184 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
185 { /* Can happen on first run after installation */
191 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
192 "%s directory %s: %s", name, path, strerror(errno));
193 smtp_closedown(US"spool or log directory problem");
194 exim_exit(EXIT_FAILURE);
197 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
199 /* Disks are getting huge. Take care with computing the size in kilobytes. */
201 return (int)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
204 /* Unable to find partition sizes in this environment. */
214 /*************************************************
215 * Check space on spool and log partitions *
216 *************************************************/
218 /* This function is called before accepting a message; if any thresholds are
219 set, it checks them. If a message_size is supplied, it checks that there is
220 enough space for that size plus the threshold - i.e. that the message won't
221 reduce the space to the threshold. Not all OS have statvfs(); for those that
222 don't, this function always returns TRUE. For some OS the old function and
223 struct name statfs is used; that is handled by a macro, defined in exim.h.
226 msg_size the (estimated) size of an incoming message
228 Returns: FALSE if there isn't enough space, or if the information cannot
230 TRUE if no check was done or there is enough space
234 receive_check_fs(int msg_size)
238 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
240 space = receive_statvfs(TRUE, &inodes);
243 debug_printf("spool directory space = %dK inodes = %d "
244 "check_space = %dK inodes = %d msg_size = %d\n",
245 space, inodes, check_spool_space, check_spool_inodes, msg_size);
247 if ((space >= 0 && space < check_spool_space) ||
248 (inodes >= 0 && inodes < check_spool_inodes))
250 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
251 "inodes=%d", space, inodes);
256 if (check_log_space > 0 || check_log_inodes > 0)
258 space = receive_statvfs(FALSE, &inodes);
261 debug_printf("log directory space = %dK inodes = %d "
262 "check_space = %dK inodes = %d\n",
263 space, inodes, check_log_space, check_log_inodes);
265 if ((space >= 0 && space < check_log_space) ||
266 (inodes >= 0 && inodes < check_log_inodes))
268 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
269 "inodes=%d", space, inodes);
279 /*************************************************
280 * Bomb out while reading a message *
281 *************************************************/
283 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
284 received, or if there is a timeout. A rarer case might be if the log files are
285 screwed up and Exim can't open them to record a message's arrival. Handling
286 that case is done by setting a flag to cause the log functions to call this
287 function if there is an ultimate disaster. That is why it is globally
291 reason text reason to pass to the not-quit ACL
292 msg default SMTP response to give if in an SMTP session
297 receive_bomb_out(uschar *reason, uschar *msg)
299 static BOOL already_bombing_out;
300 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
301 timeouts, if someone has something slow in their quit ACL. Since the only
302 things we should be doing are to close down cleanly ASAP, on the second
303 pass we also close down stuff that might be opened again, before bypassing
304 the ACL call and exiting. */
306 /* If spool_name is set, it contains the name of the data file that is being
307 written. Unlink it before closing so that it cannot be picked up by a delivery
308 process. Ensure that any header file is also removed. */
310 if (spool_name[0] != '\0')
313 spool_name[Ustrlen(spool_name) - 1] = 'H';
315 spool_name[0] = '\0';
318 /* Now close the file if it is open, either as a fd or a stream. */
320 if (data_file != NULL)
322 (void)fclose(data_file);
324 } else if (data_fd >= 0) {
325 (void)close(data_fd);
329 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
330 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
333 if (!already_bombing_out)
335 already_bombing_out = TRUE;
338 if (smtp_batched_input)
339 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
340 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
341 smtp_active_hostname, msg);
345 /* Exit from the program (non-BSMTP cases) */
347 exim_exit(EXIT_FAILURE);
351 /*************************************************
352 * Data read timeout *
353 *************************************************/
355 /* Handler function for timeouts that occur while reading the data that
358 Argument: the signal number
363 data_timeout_handler(int sig)
367 sig = sig; /* Keep picky compilers happy */
371 msg = US"SMTP incoming data timeout";
372 log_write(L_lost_incoming_connection,
373 LOG_MAIN, "SMTP data timeout (message abandoned) on connection "
375 (sender_fullhost != NULL)? sender_fullhost : US"local process",
380 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
381 log_write(L_lost_incoming_connection,
382 LOG_MAIN, "timed out while reading local message");
385 receive_bomb_out(US"data-timeout", msg); /* Does not return */
390 /*************************************************
391 * local_scan() timeout *
392 *************************************************/
394 /* Handler function for timeouts that occur while running a local_scan()
397 Argument: the signal number
402 local_scan_timeout_handler(int sig)
404 sig = sig; /* Keep picky compilers happy */
405 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function timed out - "
406 "message temporarily rejected (size %d)", message_size);
407 /* Does not return */
408 receive_bomb_out(US"local-scan-timeout", US"local verification problem");
413 /*************************************************
414 * local_scan() crashed *
415 *************************************************/
417 /* Handler function for signals that occur while running a local_scan()
420 Argument: the signal number
425 local_scan_crash_handler(int sig)
427 log_write(0, LOG_MAIN|LOG_REJECT, "local_scan() function crashed with "
428 "signal %d - message temporarily rejected (size %d)", sig, message_size);
429 /* Does not return */
430 receive_bomb_out(US"local-scan-error", US"local verification problem");
434 /*************************************************
435 * SIGTERM or SIGINT received *
436 *************************************************/
438 /* Handler for SIGTERM or SIGINT signals that occur while reading the
439 data that comprises a message.
441 Argument: the signal number
446 data_sigterm_sigint_handler(int sig)
452 msg = US"Service not available - SIGTERM or SIGINT received";
453 log_write(0, LOG_MAIN, "%s closed after %s", smtp_get_connection_info(),
454 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
458 if (filter_test == FTEST_NONE)
460 fprintf(stderr, "\nexim: %s received - message abandoned\n",
461 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
462 log_write(0, LOG_MAIN, "%s received while reading local message",
463 (sig == SIGTERM)? "SIGTERM" : "SIGINT");
467 receive_bomb_out(US"signal-exit", msg); /* Does not return */
472 /*************************************************
473 * Add new recipient to list *
474 *************************************************/
476 /* This function builds a list of recipient addresses in argc/argv
480 recipient the next address to add to recipients_list
481 pno parent number for fixed aliases; -1 otherwise
487 receive_add_recipient(uschar *recipient, int pno)
489 if (recipients_count >= recipients_list_max)
491 recipient_item *oldlist = recipients_list;
492 int oldmax = recipients_list_max;
493 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
494 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
496 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
499 recipients_list[recipients_count].address = recipient;
500 recipients_list[recipients_count].pno = pno;
501 #ifdef EXPERIMENTAL_BRIGHTMAIL
502 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
503 /* reset optin string pointer for next recipient */
504 bmi_current_optin = NULL;
506 recipients_list[recipients_count].orcpt = NULL;
507 recipients_list[recipients_count].dsn_flags = 0;
508 recipients_list[recipients_count++].errors_to = NULL;
514 /*************************************************
515 * Send user response message *
516 *************************************************/
518 /* This function is passed a default response code and a user message. It calls
519 smtp_message_code() to check and possibly modify the response code, and then
520 calls smtp_respond() to transmit the response. I put this into a function
521 just to avoid a lot of repetition.
524 code the response code
525 user_msg the user message
532 smtp_user_msg(uschar *code, uschar *user_msg)
535 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
536 smtp_respond(code, len, TRUE, user_msg);
544 /*************************************************
545 * Remove a recipient from the list *
546 *************************************************/
548 /* This function is provided for local_scan() to use.
551 recipient address to remove
553 Returns: TRUE if it did remove something; FALSE otherwise
557 receive_remove_recipient(uschar *recipient)
560 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
562 for (count = 0; count < recipients_count; count++)
564 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
566 if ((--recipients_count - count) > 0)
567 memmove(recipients_list + count, recipients_list + count + 1,
568 (recipients_count - count)*sizeof(recipient_item));
579 /*************************************************
580 * Read data portion of a non-SMTP message *
581 *************************************************/
583 /* This function is called to read the remainder of a message (following the
584 header) when the input is not from SMTP - we are receiving a local message on
585 a standard input stream. The message is always terminated by EOF, and is also
586 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
587 two cases for maximum efficiency.
589 Ensure that the body ends with a newline. This will naturally be the case when
590 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
591 as "sequences of lines" - this of course strictly applies only to SMTP, but
592 deliveries into BSD-type mailbox files also require it. Exim used to have a
593 flag for doing this at delivery time, but as it was always set for all
594 transports, I decided to simplify things by putting the check here instead.
596 There is at least one MUA (dtmail) that sends CRLF via this interface, and
597 other programs are known to do this as well. Exim used to have a option for
598 dealing with this: in July 2003, after much discussion, the code has been
599 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
601 However, for the case when a dot on a line by itself terminates a message, the
602 only recognized terminating sequences before and after the dot are LF and CRLF.
603 Otherwise, having read EOL . CR, you don't know whether to read another
606 Internally, in messages stored in Exim's spool files, LF is used as the line
607 terminator. Under the new regime, bare CRs will no longer appear in these
611 fout a FILE to which to write the message
613 Returns: One of the END_xxx values indicating why it stopped reading
617 read_message_data(FILE *fout)
621 register int linelength = 0;
623 /* Handle the case when only EOF terminates the message */
627 register int last_ch = '\n';
629 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
631 if (ch == 0) body_zerocount++;
632 if (last_ch == '\r' && ch != '\n')
634 if (linelength > max_received_linelength)
635 max_received_linelength = linelength;
637 if (fputc('\n', fout) == EOF) return END_WERROR;
641 if (ch == '\r') continue;
643 if (fputc(ch, fout) == EOF) return END_WERROR;
646 if (linelength > max_received_linelength)
647 max_received_linelength = linelength;
652 if (++message_size > thismessage_size_limit) return END_SIZE;
657 if (linelength > max_received_linelength)
658 max_received_linelength = linelength;
659 if (fputc('\n', fout) == EOF) return END_WERROR;
667 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
671 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
673 if (ch == 0) body_zerocount++;
676 case 0: /* Normal state (previous char written) */
680 if (linelength > max_received_linelength)
681 max_received_linelength = linelength;
686 { ch_state = 2; continue; }
689 case 1: /* After written "\n" */
690 if (ch == '.') { ch_state = 3; continue; }
691 if (ch == '\r') { ch_state = 2; continue; }
692 if (ch == '\n') { body_linecount++; linelength = -1; }
697 body_linecount++; /* After unwritten "\r" */
698 if (linelength > max_received_linelength)
699 max_received_linelength = linelength;
707 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
708 if (ch == '\r') continue;
714 case 3: /* After "\n." (\n written, dot not) */
715 if (ch == '\n') return END_DOT;
716 if (ch == '\r') { ch_state = 4; continue; }
719 if (fputc('.', fout) == EOF) return END_WERROR;
723 case 4: /* After "\n.\r" (\n written, rest not) */
724 if (ch == '\n') return END_DOT;
727 if (fputs(".\n", fout) == EOF) return END_WERROR;
728 if (ch == '\r') { ch_state = 2; continue; }
734 if (fputc(ch, fout) == EOF) return END_WERROR;
735 if (++message_size > thismessage_size_limit) return END_SIZE;
738 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
739 the message ends with a newline, and we must also write any characters that
740 were saved up while testing for an ending dot. */
744 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
745 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
746 message_size += Ustrlen(ends[ch_state]);
756 /*************************************************
757 * Read data portion of an SMTP message *
758 *************************************************/
760 /* This function is called to read the remainder of an SMTP message (after the
761 headers), or to skip over it when an error has occurred. In this case, the
762 output file is passed as NULL.
764 If any line begins with a dot, that character is skipped. The input should only
765 be successfully terminated by CR LF . CR LF unless it is local (non-network)
766 SMTP, in which case the CRs are optional, but...
768 FUDGE: It seems that sites on the net send out messages with just LF
769 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
770 we make the CRs optional in all cases.
772 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
773 well, so that there are no CRs in spooled messages. However, the message
774 terminating dot is not recognized between two bare CRs.
777 fout a FILE to which to write the message; NULL if skipping
779 Returns: One of the END_xxx values indicating why it stopped reading
783 read_message_data_smtp(FILE *fout)
789 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
791 if (ch == 0) body_zerocount++;
794 case 0: /* After LF or CRLF */
798 continue; /* Don't ever write . after LF */
802 /* Else fall through to handle as normal uschar. */
804 case 1: /* Normal state */
809 if (linelength > max_received_linelength)
810 max_received_linelength = linelength;
820 case 2: /* After (unwritten) CR */
822 if (linelength > max_received_linelength)
823 max_received_linelength = linelength;
832 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
833 (void) cutthrough_put_nl();
834 if (ch != '\r') ch_state = 1; else continue;
838 case 3: /* After [CR] LF . */
846 /* The dot was removed at state 3. For a doubled dot, here, reinstate
847 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
848 and to file below. */
852 (void) cutthrough_puts(&c, 1);
857 case 4: /* After [CR] LF . CR */
858 if (ch == '\n') return END_DOT;
861 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
862 (void) cutthrough_put_nl();
872 /* Add the character to the spool file, unless skipping; then loop for the
879 if (fputc(ch, fout) == EOF) return END_WERROR;
880 if (message_size > thismessage_size_limit) return END_SIZE;
883 (void) cutthrough_put_nl();
887 (void) cutthrough_puts(&c, 1);
891 /* Fall through here if EOF encountered. This indicates some kind of error,
892 since a correct message is terminated by [CR] LF . [CR] LF. */
900 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
901 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
902 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
903 body_linecount accounting for proper re-expansion for the wire, so use
904 a cut-down version of the state-machine above; we don't need to do leading-dot
905 detection and unstuffing.
908 fout a FILE to which to write the message; NULL if skipping
910 Returns: One of the END_xxx values indicating why it stopped reading
914 read_message_bdat_smtp(FILE *fout)
916 int ch_state = 0, linelength = 0, ch;
920 switch ((ch = (bdat_getc)(GETC_BUFFER_UNLIMITED)))
922 case EOF: return END_EOF;
923 case EOD: return END_DOT; /* normal exit */
924 case ERR: return END_PROTOCOL;
925 case '\0': body_zerocount++; break;
929 case 0: /* After LF or CRLF */
931 /* fall through to handle as normal uschar. */
933 case 1: /* Mid-line state */
938 if (linelength > max_received_linelength)
939 max_received_linelength = linelength;
945 continue; /* don't write CR */
949 case 2: /* After (unwritten) CR */
951 if (linelength > max_received_linelength)
952 max_received_linelength = linelength;
959 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
960 (void) cutthrough_put_nl();
961 if (ch == '\r') continue; /* don't write CR */
967 /* Add the character to the spool file, unless skipping */
973 if (fputc(ch, fout) == EOF) return END_WERROR;
974 if (message_size > thismessage_size_limit) return END_SIZE;
977 (void) cutthrough_put_nl();
981 (void) cutthrough_puts(&c, 1);
990 /*************************************************
991 * Swallow SMTP message *
992 *************************************************/
994 /* This function is called when there has been some kind of error while reading
995 an SMTP message, and the remaining data may need to be swallowed. It is global
996 because it is called from smtp_closedown() to shut down an incoming call
999 Argument: a FILE from which to read the message
1004 receive_swallow_smtp(void)
1006 /*XXX CHUNKING: not enough. read chunks until RSET? */
1007 if (message_ended >= END_NOTENDED)
1008 message_ended = read_message_data_smtp(NULL);
1013 /*************************************************
1014 * Handle lost SMTP connection *
1015 *************************************************/
1017 /* This function logs connection loss incidents and generates an appropriate
1020 Argument: additional data for the message
1021 Returns: the SMTP response
1025 handle_lost_connection(uschar *s)
1027 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1028 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1029 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1030 return US"421 Lost incoming connection";
1036 /*************************************************
1037 * Handle a non-smtp reception error *
1038 *************************************************/
1040 /* This function is called for various errors during the reception of non-SMTP
1041 messages. It either sends a message to the sender of the problem message, or it
1042 writes to the standard error stream.
1045 errcode code for moan_to_sender(), identifying the error
1046 text1 first message text, passed to moan_to_sender()
1047 text2 second message text, used only for stderrr
1048 error_rc code to pass to exim_exit if no problem
1049 f FILE containing body of message (may be stdin)
1050 hptr pointer to instore headers or NULL
1052 Returns: calls exim_exit(), which does not return
1056 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1057 FILE *f, header_line *hptr)
1059 if (error_handling == ERRORS_SENDER)
1063 eblock.text1 = text1;
1064 eblock.text2 = US"";
1065 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1066 error_rc = EXIT_FAILURE;
1069 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1071 exim_exit(error_rc);
1076 /*************************************************
1077 * Add header lines set up by ACL *
1078 *************************************************/
1080 /* This function is called to add the header lines that were set up by
1081 statements in an ACL to the list of headers in memory. It is done in two stages
1082 like this, because when the ACL for RCPT is running, the other headers have not
1083 yet been received. This function is called twice; once just before running the
1084 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1085 are visible to the DATA ACL.
1087 Originally these header lines were added at the end. Now there is support for
1088 three different places: top, bottom, and after the Received: header(s). There
1089 will always be at least one Received: header, even if it is marked deleted, and
1090 even if something else has been put in front of it.
1093 acl_name text to identify which ACL
1099 add_acl_headers(int where, uschar *acl_name)
1101 header_line *h, *next;
1102 header_line *last_received = NULL;
1106 case ACL_WHERE_DKIM:
1107 case ACL_WHERE_MIME:
1108 case ACL_WHERE_DATA:
1109 if (cutthrough.fd >= 0 && (acl_removed_headers || acl_added_headers))
1111 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1112 " will not take effect on cutthrough deliveries");
1117 if (acl_removed_headers != NULL)
1119 DEBUG(D_receive|D_acl) debug_printf(">>Headers removed by %s ACL:\n", acl_name);
1121 for (h = header_list; h != NULL; h = h->next) if (h->type != htype_old)
1123 const uschar * list = acl_removed_headers;
1124 int sep = ':'; /* This is specified as a colon-separated list */
1128 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1129 if (header_testname(h, s, Ustrlen(s), FALSE))
1131 h->type = htype_old;
1132 DEBUG(D_receive|D_acl) debug_printf(" %s", h->text);
1135 acl_removed_headers = NULL;
1136 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1139 if (acl_added_headers == NULL) return;
1140 DEBUG(D_receive|D_acl) debug_printf(">>Headers added by %s ACL:\n", acl_name);
1142 for (h = acl_added_headers; h != NULL; h = next)
1149 h->next = header_list;
1151 DEBUG(D_receive|D_acl) debug_printf(" (at top)");
1155 if (last_received == NULL)
1157 last_received = header_list;
1158 while (!header_testname(last_received, US"Received", 8, FALSE))
1159 last_received = last_received->next;
1160 while (last_received->next != NULL &&
1161 header_testname(last_received->next, US"Received", 8, FALSE))
1162 last_received = last_received->next;
1164 h->next = last_received->next;
1165 last_received->next = h;
1166 DEBUG(D_receive|D_acl) debug_printf(" (after Received:)");
1170 /* add header before any header which is NOT Received: or Resent- */
1171 last_received = header_list;
1172 while ( (last_received->next != NULL) &&
1173 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1174 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1175 last_received = last_received->next;
1176 /* last_received now points to the last Received: or Resent-* header
1177 in an uninterrupted chain of those header types (seen from the beginning
1178 of all headers. Our current header must follow it. */
1179 h->next = last_received->next;
1180 last_received->next = h;
1181 DEBUG(D_receive|D_acl) debug_printf(" (before any non-Received: or Resent-*: header)");
1186 header_last->next = h;
1190 if (h->next == NULL) header_last = h;
1192 /* Check for one of the known header types (From:, To:, etc.) though in
1193 practice most added headers are going to be "other". Lower case
1194 identification letters are never stored with the header; they are used
1195 for existence tests when messages are received. So discard any lower case
1198 h->type = header_checkname(h, FALSE);
1199 if (h->type >= 'a') h->type = htype_other;
1201 DEBUG(D_receive|D_acl) debug_printf(" %s", header_last->text);
1204 acl_added_headers = NULL;
1205 DEBUG(D_receive|D_acl) debug_printf(">>\n");
1210 /*************************************************
1211 * Add host information for log line *
1212 *************************************************/
1214 /* Called for acceptance and rejecting log lines. This adds information about
1215 the calling host to a string that is being built dynamically.
1218 s the dynamic string
1219 sizeptr points to the size variable
1220 ptrptr points to the pointer variable
1222 Returns: the extended string
1226 add_host_info_for_log(uschar * s, int * sizeptr, int * ptrptr)
1228 if (sender_fullhost)
1230 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1231 s = string_cat(s, sizeptr, ptrptr, US" DS");
1232 s = string_append(s, sizeptr, ptrptr, 2, US" H=", sender_fullhost);
1233 if (LOGGING(incoming_interface) && interface_address != NULL)
1235 s = string_cat(s, sizeptr, ptrptr,
1236 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1239 if (sender_ident != NULL)
1240 s = string_append(s, sizeptr, ptrptr, 2, US" U=", sender_ident);
1241 if (received_protocol != NULL)
1242 s = string_append(s, sizeptr, ptrptr, 2, US" P=", received_protocol);
1248 #ifdef WITH_CONTENT_SCAN
1250 /*************************************************
1251 * Run the MIME ACL on a message *
1252 *************************************************/
1254 /* This code is in a subroutine so that it can be used for both SMTP
1255 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1258 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1259 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1260 smtp_reply_ptr Where SMTP reply is being built
1261 blackholed_by_ptr Where "blackholed by" message is being built
1263 Returns: TRUE to carry on; FALSE to abandon the message
1267 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1268 uschar **blackholed_by_ptr)
1271 uschar rfc822_file_path[2048];
1272 unsigned long mbox_size;
1273 header_line *my_headerlist;
1274 uschar *user_msg, *log_msg;
1275 int mime_part_count_buffer = -1;
1278 memset(CS rfc822_file_path,0,2048);
1280 /* check if it is a MIME message */
1281 my_headerlist = header_list;
1282 while (my_headerlist != NULL)
1284 /* skip deleted headers */
1285 if (my_headerlist->type == '*')
1287 my_headerlist = my_headerlist->next;
1290 if (strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0)
1292 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1295 my_headerlist = my_headerlist->next;
1298 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1302 /* make sure the eml mbox file is spooled up */
1303 mbox_file = spool_mbox(&mbox_size, NULL);
1304 if (mbox_file == NULL) {
1305 /* error while spooling */
1306 log_write(0, LOG_MAIN|LOG_PANIC,
1307 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1308 Uunlink(spool_name);
1310 #ifdef EXPERIMENTAL_DCC
1313 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1314 message_id[0] = 0; /* Indicate no message accepted */
1315 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1316 return FALSE; /* Indicate skip to end of receive function */
1322 mime_part_count = -1;
1323 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1324 (void)fclose(mbox_file);
1326 if (Ustrlen(rfc822_file_path) > 0)
1328 mime_part_count = mime_part_count_buffer;
1330 if (unlink(CS rfc822_file_path) == -1)
1332 log_write(0, LOG_PANIC,
1333 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1338 /* check if we must check any message/rfc822 attachments */
1341 uschar temp_path[1024];
1342 struct dirent * entry;
1345 (void) string_format(temp_path, sizeof(temp_path), "%s/scan/%s",
1346 spool_directory, message_id);
1348 tempdir = opendir(CS temp_path);
1351 if (!(entry = readdir(tempdir)))
1353 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1355 (void) string_format(rfc822_file_path, sizeof(rfc822_file_path),
1356 "%s/scan/%s/%s", spool_directory, message_id, entry->d_name);
1357 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1366 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1368 /* set RFC822 expansion variable */
1370 mime_part_count_buffer = mime_part_count;
1371 goto MIME_ACL_CHECK;
1373 log_write(0, LOG_PANIC,
1374 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1375 unlink(CS rfc822_file_path);
1380 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1383 recipients_count = 0;
1384 *blackholed_by_ptr = US"MIME ACL";
1388 Uunlink(spool_name);
1390 #ifdef EXPERIMENTAL_DCC
1394 && smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1396 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1397 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1399 message_id[0] = 0; /* Indicate no message accepted */
1400 return FALSE; /* Cause skip to end of receive function */
1406 #endif /* WITH_CONTENT_SCAN */
1411 received_header_gen(void)
1415 header_line *received_header= header_list;
1417 timestamp = expand_string(US"${tod_full}");
1418 if (recipients_count == 1) received_for = recipients_list[0].address;
1419 received = expand_string(received_header_text);
1420 received_for = NULL;
1424 if(spool_name[0] != 0)
1425 Uunlink(spool_name); /* Lose the data file */
1426 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1427 "(received_header_text) failed: %s", string_printing(received_header_text),
1428 expand_string_message);
1431 /* The first element on the header chain is reserved for the Received header,
1432 so all we have to do is fill in the text pointer, and set the type. However, if
1433 the result of the expansion is an empty string, we leave the header marked as
1434 "old" so as to refrain from adding a Received header. */
1436 if (received[0] == 0)
1438 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1439 received_header->type = htype_old;
1443 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1444 received_header->type = htype_received;
1447 received_header->slen = Ustrlen(received_header->text);
1449 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1450 received_header->type, received_header->text);
1455 /*************************************************
1457 *************************************************/
1459 /* Receive a message on the given input, and put it into a pair of spool files.
1460 Either a non-null list of recipients, or the extract flag will be true, or
1461 both. The flag sender_local is true for locally generated messages. The flag
1462 submission_mode is true if an ACL has obeyed "control = submission". The flag
1463 suppress_local_fixups is true if an ACL has obeyed "control =
1464 suppress_local_fixups" or -G was passed on the command-line.
1465 The flag smtp_input is true if the message is to be
1466 handled using SMTP conventions about termination and lines starting with dots.
1467 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1469 If a message was successfully read, message_id[0] will be non-zero.
1471 The general actions of this function are:
1473 . Read the headers of the message (if any) into a chain of store
1476 . If there is a "sender:" header and the message is locally originated,
1477 throw it away, unless the caller is trusted, or unless
1478 active_local_sender_retain is set - which can only happen if
1479 active_local_from_check is false.
1481 . If recipients are to be extracted from the message, build the
1482 recipients list from the headers, removing any that were on the
1483 original recipients list (unless extract_addresses_remove_arguments is
1484 false), and at the same time, remove any bcc header that may be present.
1486 . Get the spool file for the data, sort out its unique name, open
1487 and lock it (but don't give it the name yet).
1489 . Generate a "Message-Id" header if the message doesn't have one, for
1490 locally-originated messages.
1492 . Generate a "Received" header.
1494 . Ensure the recipients list is fully qualified and rewritten if necessary.
1496 . If there are any rewriting rules, apply them to the sender address
1497 and also to the headers.
1499 . If there is no from: header, generate one, for locally-generated messages
1500 and messages in "submission mode" only.
1502 . If the sender is local, check that from: is correct, and if not, generate
1503 a Sender: header, unless message comes from a trusted caller, or this
1504 feature is disabled by active_local_from_check being false.
1506 . If there is no "date" header, generate one, for locally-originated
1507 or submission mode messages only.
1509 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1510 dot_ends mode, to the data file. Leave it open, to hold the lock.
1512 . Write the envelope and the headers to a new file.
1514 . Set the name for the header file; close it.
1516 . Set the name for the data file; close it.
1518 Because this function can potentially be called many times in a single
1519 SMTP connection, all store should be got by store_get(), so that it will be
1520 automatically retrieved after the message is accepted.
1522 FUDGE: It seems that sites on the net send out messages with just LF
1523 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1524 we make the CRs optional in all cases.
1526 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1527 new regime is now in place in which bare CRs in header lines are turned into LF
1528 followed by a space, so as not to terminate the header line.
1530 February 2004: A bare LF in a header line in a message whose first line was
1531 terminated by CRLF is treated in the same way as a bare CR.
1534 extract_recip TRUE if recipients are to be extracted from the message's
1537 Returns: TRUE there are more messages to be read (SMTP input)
1538 FALSE there are no more messages to be read (non-SMTP input
1539 or SMTP connection collapsed, or other failure)
1541 When reading a message for filter testing, the returned value indicates
1542 whether the headers (which is all that is read) were terminated by '.' or
1546 receive_msg(BOOL extract_recip)
1551 int process_info_len = Ustrlen(process_info);
1552 int error_rc = (error_handling == ERRORS_SENDER)?
1553 errors_sender_rc : EXIT_FAILURE;
1554 int header_size = 256;
1555 int start, end, domain, size, sptr;
1558 int prevlines_length = 0;
1560 register int ptr = 0;
1562 BOOL contains_resent_headers = FALSE;
1563 BOOL extracted_ignored = FALSE;
1564 BOOL first_line_ended_crlf = TRUE_UNSET;
1565 BOOL smtp_yield = TRUE;
1568 BOOL resents_exist = FALSE;
1569 uschar *resent_prefix = US"";
1570 uschar *blackholed_by = NULL;
1571 uschar *blackhole_log_msg = US"";
1572 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1575 error_block *bad_addresses = NULL;
1577 uschar *frozen_by = NULL;
1578 uschar *queued_by = NULL;
1581 struct stat statbuf;
1583 /* Final message to give to SMTP caller, and messages from ACLs */
1585 uschar *smtp_reply = NULL;
1586 uschar *user_msg, *log_msg;
1588 /* Working header pointers */
1590 header_line *h, *next;
1592 /* Flags for noting the existence of certain headers (only one left) */
1594 BOOL date_header_exists = FALSE;
1596 /* Pointers to receive the addresses of headers whose contents we need. */
1598 header_line *from_header = NULL;
1599 header_line *subject_header = NULL;
1600 header_line *msgid_header = NULL;
1601 header_line *received_header;
1603 #ifdef EXPERIMENTAL_DMARC
1605 #endif /* EXPERIMENTAL_DMARC */
1607 /* Variables for use when building the Received: header. */
1612 /* Release any open files that might have been cached while preparing to
1613 accept the message - e.g. by verifying addresses - because reading a message
1614 might take a fair bit of real time. */
1618 /* Extracting the recipient list from an input file is incompatible with
1619 cutthrough delivery with the no-spool option. It shouldn't be possible
1620 to set up the combination, but just in case kill any ongoing connection. */
1621 if (extract_recip || !smtp_input)
1622 cancel_cutthrough_connection("not smtp input");
1624 /* Initialize the chain of headers by setting up a place-holder for Received:
1625 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1626 pointing to the end of the chain to make adding headers simple. */
1628 received_header = header_list = header_last = store_get(sizeof(header_line));
1629 header_list->next = NULL;
1630 header_list->type = htype_old;
1631 header_list->text = NULL;
1632 header_list->slen = 0;
1634 /* Control block for the next header to be read. */
1636 next = store_get(sizeof(header_line));
1637 next->text = store_get(header_size);
1639 /* Initialize message id to be null (indicating no message read), and the
1640 header names list to be the normal list. Indicate there is no data file open
1641 yet, initialize the size and warning count, and deal with no size limit. */
1649 received_count = 1; /* For the one we will add */
1651 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1653 /* While reading the message, the following counts are computed. */
1655 message_linecount = body_linecount = body_zerocount =
1656 max_received_linelength = 0;
1658 #ifndef DISABLE_DKIM
1659 /* Call into DKIM to set up the context. In CHUNKING mode
1660 we clear the dot-stuffing flag */
1661 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1662 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1665 #ifdef EXPERIMENTAL_DMARC
1666 /* initialize libopendmarc */
1667 dmarc_up = dmarc_init();
1670 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1671 ids, and fractions of a second are required. See the comments that precede the
1672 message id creation below. */
1674 (void)gettimeofday(&message_id_tv, NULL);
1676 /* For other uses of the received time we can operate with granularity of one
1677 second, and for that we use the global variable received_time. This is for
1678 things like ultimate message timeouts. */
1680 received_time = message_id_tv.tv_sec;
1682 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1683 happen in the smtp_getc() function when it refills its buffer. */
1685 if (smtp_input) os_non_restarting_signal(SIGALRM, data_timeout_handler);
1687 /* If not SMTP input, timeout happens only if configured, and we just set a
1688 single timeout for the whole message. */
1690 else if (receive_timeout > 0)
1692 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1693 alarm(receive_timeout);
1696 /* SIGTERM and SIGINT are caught always. */
1698 signal(SIGTERM, data_sigterm_sigint_handler);
1699 signal(SIGINT, data_sigterm_sigint_handler);
1701 /* Header lines in messages are not supposed to be very long, though when
1702 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1703 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1704 storing the header, and extend this as necessary using string_cat().
1706 To cope with total lunacies, impose an upper limit on the length of the header
1707 section of the message, as otherwise the store will fill up. We must also cope
1708 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1709 Folded header lines are joined into one string, leaving the '\n' characters
1710 inside them, so that writing them out reproduces the input.
1712 Loop for each character of each header; the next structure for chaining the
1713 header is set up already, with ptr the offset of the next character in
1718 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1720 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1721 SMTP must have a correct "." terminator. */
1723 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1725 smtp_reply = handle_lost_connection(US" (header)");
1727 goto TIDYUP; /* Skip to end of function */
1730 /* See if we are at the current header's size limit - there must be at least
1731 four bytes left. This allows for the new character plus a zero, plus two for
1732 extra insertions when we are playing games with dots and carriage returns. If
1733 we are at the limit, extend the text buffer. This could have been done
1734 automatically using string_cat() but because this is a tightish loop storing
1735 only one character at a time, we choose to do it inline. Normally
1736 store_extend() will be able to extend the block; only at the end of a big
1737 store block will a copy be needed. To handle the case of very long headers
1738 (and sometimes lunatic messages can have ones that are 100s of K long) we
1739 call store_release() for strings that have been copied - if the string is at
1740 the start of a block (and therefore the only thing in it, because we aren't
1741 doing any other gets), the block gets freed. We can only do this because we
1742 know there are no other calls to store_get() going on. */
1744 if (ptr >= header_size - 4)
1746 int oldsize = header_size;
1747 /* header_size += 256; */
1749 if (!store_extend(next->text, oldsize, header_size))
1751 uschar *newtext = store_get(header_size);
1752 memcpy(newtext, next->text, ptr);
1753 store_release(next->text);
1754 next->text = newtext;
1758 /* Cope with receiving a binary zero. There is dispute about whether
1759 these should be allowed in RFC 822 messages. The middle view is that they
1760 should not be allowed in headers, at least. Exim takes this attitude at
1761 the moment. We can't just stomp on them here, because we don't know that
1762 this line is a header yet. Set a flag to cause scanning later. */
1764 if (ch == 0) had_zero++;
1766 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1767 those from data files use just LF. Treat LF in local SMTP input as a
1768 terminator too. Treat EOF as a line terminator always. */
1770 if (ch == EOF) goto EOL;
1772 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1773 other MTAs accept this. We are therefore forced into this "liberalisation"
1774 too, so we accept LF as a line terminator whatever the source of the message.
1775 However, if the first line of the message ended with a CRLF, we treat a bare
1776 LF specially by inserting a white space after it to ensure that the header
1777 line is not terminated. */
1781 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1782 else if (first_line_ended_crlf) receive_ungetc(' ');
1786 /* This is not the end of the line. If this is SMTP input and this is
1787 the first character in the line and it is a "." character, ignore it.
1788 This implements the dot-doubling rule, though header lines starting with
1789 dots aren't exactly common. They are legal in RFC 822, though. If the
1790 following is CRLF or LF, this is the line that that terminates the
1791 entire message. We set message_ended to indicate this has happened (to
1792 prevent further reading), and break out of the loop, having freed the
1793 empty header, and set next = NULL to indicate no data line. */
1795 if (ptr == 0 && ch == '.' && (smtp_input || dot_ends))
1797 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1800 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1804 ch = '\r'; /* Revert to CR */
1809 message_ended = END_DOT;
1812 break; /* End character-reading loop */
1815 /* For non-SMTP input, the dot at the start of the line was really a data
1816 character. What is now in ch is the following character. We guaranteed
1817 enough space for this above. */
1821 next->text[ptr++] = '.';
1826 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1827 remember this case if this is the first line ending. */
1831 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1834 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1838 /* Otherwise, put back the character after CR, and turn the bare CR
1841 ch = (receive_ungetc)(ch);
1842 next->text[ptr++] = '\n';
1847 /* We have a data character for the header line. */
1849 next->text[ptr++] = ch; /* Add to buffer */
1850 message_size++; /* Total message size so far */
1852 /* Handle failure due to a humungously long header section. The >= allows
1853 for the terminating \n. Add what we have so far onto the headers list so
1854 that it gets reflected in any error message, and back up the just-read
1857 if (message_size >= header_maxsize)
1859 next->text[ptr] = 0;
1861 next->type = htype_other;
1863 header_last->next = next;
1866 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1867 "%s (more than %d characters): message abandoned",
1868 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1872 smtp_reply = US"552 Message header is ridiculously long";
1873 receive_swallow_smtp();
1874 goto TIDYUP; /* Skip to end of function */
1879 give_local_error(ERRMESS_VLONGHEADER,
1880 string_sprintf("message header longer than %d characters received: "
1881 "message not accepted", header_maxsize), US"", error_rc, stdin,
1883 /* Does not return */
1887 continue; /* With next input character */
1889 /* End of header line reached */
1893 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1895 receive_linecount++;
1896 message_linecount++;
1898 /* Keep track of maximum line length */
1900 if (ptr - prevlines_length > max_received_linelength)
1901 max_received_linelength = ptr - prevlines_length;
1902 prevlines_length = ptr + 1;
1904 /* Now put in the terminating newline. There is always space for
1905 at least two more characters. */
1907 next->text[ptr++] = '\n';
1910 /* A blank line signals the end of the headers; release the unwanted
1911 space and set next to NULL to indicate this. */
1920 /* There is data in the line; see if the next input character is a
1921 whitespace character. If it is, we have a continuation of this header line.
1922 There is always space for at least one character at this point. */
1926 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1927 if (nextch == ' ' || nextch == '\t')
1929 next->text[ptr++] = nextch;
1931 continue; /* Iterate the loop */
1933 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
1934 else ch = EOF; /* Cause main loop to exit at end */
1937 /* We have got to the real line end. Terminate the string and release store
1938 beyond it. If it turns out to be a real header, internal binary zeros will
1939 be squashed later. */
1941 next->text[ptr] = 0;
1943 store_reset(next->text + ptr + 1);
1945 /* Check the running total size against the overall message size limit. We
1946 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1947 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1948 headers - the code to read the body will then also hit the buffer. */
1950 if (message_size > thismessage_size_limit) break;
1952 /* A line that is not syntactically correct for a header also marks
1953 the end of the headers. In this case, we leave next containing the
1954 first data line. This might actually be several lines because of the
1955 continuation logic applied above, but that doesn't matter.
1957 It turns out that smail, and presumably sendmail, accept leading lines
1960 From ph10 Fri Jan 5 12:35 GMT 1996
1962 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1963 find any documentation of this, but for compatibility it had better be
1964 accepted. Exim restricts it to the case of non-smtp messages, and
1965 treats it as an alternative to the -f command line option. Thus it is
1966 ignored except for trusted users or filter testing. Otherwise it is taken
1967 as the sender address, unless -f was used (sendmail compatibility).
1969 It further turns out that some UUCPs generate the From_line in a different
1972 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1974 The regex for matching these things is now capable of recognizing both
1975 formats (including 2- and 4-digit years in the latter). In fact, the regex
1976 is now configurable, as is the expansion string to fish out the sender.
1978 Even further on it has been discovered that some broken clients send
1979 these lines in SMTP messages. There is now an option to ignore them from
1980 specified hosts or networks. Sigh. */
1982 if (header_last == header_list &&
1985 (sender_host_address != NULL &&
1986 verify_check_host(&ignore_fromline_hosts) == OK)
1988 (sender_host_address == NULL && ignore_fromline_local)
1990 regex_match_and_setup(regex_From, next->text, 0, -1))
1992 if (!sender_address_forced)
1994 uschar *uucp_sender = expand_string(uucp_from_sender);
1995 if (uucp_sender == NULL)
1997 log_write(0, LOG_MAIN|LOG_PANIC,
1998 "expansion of \"%s\" failed after matching "
1999 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2003 int start, end, domain;
2005 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2006 &start, &end, &domain, TRUE);
2007 if (newsender != NULL)
2009 if (domain == 0 && newsender[0] != 0)
2010 newsender = rewrite_address_qualify(newsender, FALSE);
2012 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2014 sender_address = newsender;
2016 if (trusted_caller || filter_test != FTEST_NONE)
2018 authenticated_sender = NULL;
2019 originator_name = US"";
2020 sender_local = FALSE;
2023 if (filter_test != FTEST_NONE)
2024 printf("Sender taken from \"From \" line\n");
2031 /* Not a leading "From " line. Check to see if it is a valid header line.
2032 Header names may contain any non-control characters except space and colon,
2037 uschar *p = next->text;
2039 /* If not a valid header line, break from the header reading loop, leaving
2040 next != NULL, indicating that it holds the first line of the body. */
2042 if (isspace(*p)) break;
2043 while (mac_isgraph(*p) && *p != ':') p++;
2044 while (isspace(*p)) p++;
2047 body_zerocount = had_zero;
2051 /* We have a valid header line. If there were any binary zeroes in
2052 the line, stomp on them here. */
2055 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2057 /* It is perfectly legal to have an empty continuation line
2058 at the end of a header, but it is confusing to humans
2059 looking at such messages, since it looks like a blank line.
2060 Reduce confusion by removing redundant white space at the
2061 end. We know that there is at least one printing character
2062 (the ':' tested for above) so there is no danger of running
2065 p = next->text + ptr - 2;
2068 while (*p == ' ' || *p == '\t') p--;
2069 if (*p != '\n') break;
2070 ptr = (p--) - next->text + 1;
2071 message_size -= next->slen - ptr;
2072 next->text[ptr] = 0;
2076 /* Add the header to the chain */
2078 next->type = htype_other;
2080 header_last->next = next;
2083 /* Check the limit for individual line lengths. This comes after adding to
2084 the chain so that the failing line is reflected if a bounce is generated
2085 (for a local message). */
2087 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2089 log_write(0, LOG_MAIN, "overlong message header line received from "
2090 "%s (more than %d characters): message abandoned",
2091 sender_host_unknown? sender_ident : sender_fullhost,
2092 header_line_maxsize);
2096 smtp_reply = US"552 A message header line is too long";
2097 receive_swallow_smtp();
2098 goto TIDYUP; /* Skip to end of function */
2103 give_local_error(ERRMESS_VLONGHDRLINE,
2104 string_sprintf("message header line longer than %d characters "
2105 "received: message not accepted", header_line_maxsize), US"",
2106 error_rc, stdin, header_list->next);
2107 /* Does not return */
2111 /* Note if any resent- fields exist. */
2113 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2115 resents_exist = TRUE;
2116 resent_prefix = US"Resent-";
2120 /* Reject CHUNKING messages that do not CRLF their first header line */
2122 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2124 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2125 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2127 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2128 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2129 smtp_printf("552 Message header not CRLF terminated\r\n");
2132 goto TIDYUP; /* Skip to end of function */
2135 /* The line has been handled. If we have hit EOF, break out of the loop,
2136 indicating no pending data line. */
2138 if (ch == EOF) { next = NULL; break; }
2140 /* Set up for the next header */
2143 next = store_get(sizeof(header_line));
2144 next->text = store_get(header_size);
2147 prevlines_length = 0;
2148 } /* Continue, starting to read the next header */
2150 /* At this point, we have read all the headers into a data structure in main
2151 store. The first header is still the dummy placeholder for the Received: header
2152 we are going to generate a bit later on. If next != NULL, it contains the first
2153 data line - which terminated the headers before reaching a blank line (not the
2158 debug_printf(">>Headers received:\n");
2159 for (h = header_list->next; h; h = h->next)
2160 debug_printf("%s", h->text);
2164 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2165 is dropped immediately after valid headers, the next thing we will see is EOF.
2166 We must test for this specially, as further down the reading of the data is
2167 skipped if already at EOF. */
2169 if (smtp_input && (receive_feof)())
2171 smtp_reply = handle_lost_connection(US" (after header)");
2173 goto TIDYUP; /* Skip to end of function */
2176 /* If this is a filter test run and no headers were read, output a warning
2177 in case there is a mistake in the test message. */
2179 if (filter_test != FTEST_NONE && header_list->next == NULL)
2180 printf("Warning: no message headers read\n");
2183 /* Scan the headers to identify them. Some are merely marked for later
2184 processing; some are dealt with here. */
2186 for (h = header_list->next; h; h = h->next)
2188 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2189 if (is_resent) contains_resent_headers = TRUE;
2191 switch (header_checkname(h, is_resent))
2194 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2198 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2201 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2204 if (!resents_exist || is_resent) date_header_exists = TRUE;
2207 /* Same comments as about Return-Path: below. */
2209 case htype_delivery_date:
2210 if (delivery_date_remove) h->type = htype_old;
2213 /* Same comments as about Return-Path: below. */
2215 case htype_envelope_to:
2216 if (envelope_to_remove) h->type = htype_old;
2219 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2220 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2221 header consists of just the login id of the user who called Exim, rewrite
2222 it with the gecos field first. Apply this rule to Resent-From: if there
2223 are resent- fields. */
2226 h->type = htype_from;
2227 if (!resents_exist || is_resent)
2233 uschar *s = Ustrchr(h->text, ':') + 1;
2234 while (isspace(*s)) s++;
2235 len = h->slen - (s - h->text) - 1;
2236 if (Ustrlen(originator_login) == len &&
2237 strncmpic(s, originator_login, len) == 0)
2239 uschar *name = is_resent? US"Resent-From" : US"From";
2240 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2241 originator_login, qualify_domain_sender);
2242 from_header = header_last;
2243 h->type = htype_old;
2244 DEBUG(D_receive|D_rewrite)
2245 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2251 /* Identify the Message-id: header for generating "in-reply-to" in the
2252 autoreply transport. For incoming logging, save any resent- value. In both
2253 cases, take just the first of any multiples. */
2256 if (msgid_header == NULL && (!resents_exist || is_resent))
2263 /* Flag all Received: headers */
2265 case htype_received:
2266 h->type = htype_received;
2270 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2272 case htype_reply_to:
2273 h->type = htype_reply_to;
2276 /* The Return-path: header is supposed to be added to messages when
2277 they leave the SMTP system. We shouldn't receive messages that already
2278 contain Return-path. However, since Exim generates Return-path: on
2279 local delivery, resent messages may well contain it. We therefore
2280 provide an option (which defaults on) to remove any Return-path: headers
2281 on input. Removal actually means flagging as "old", which prevents the
2282 header being transmitted with the message. */
2284 case htype_return_path:
2285 if (return_path_remove) h->type = htype_old;
2287 /* If we are testing a mail filter file, use the value of the
2288 Return-Path: header to set up the return_path variable, which is not
2289 otherwise set. However, remove any <> that surround the address
2290 because the variable doesn't have these. */
2292 if (filter_test != FTEST_NONE)
2294 uschar *start = h->text + 12;
2295 uschar *end = start + Ustrlen(start);
2296 while (isspace(*start)) start++;
2297 while (end > start && isspace(end[-1])) end--;
2298 if (*start == '<' && end[-1] == '>')
2303 return_path = string_copyn(start, end - start);
2304 printf("Return-path taken from \"Return-path:\" header line\n");
2308 /* If there is a "Sender:" header and the message is locally originated,
2309 and from an untrusted caller and suppress_local_fixups is not set, or if we
2310 are in submission mode for a remote message, mark it "old" so that it will
2311 not be transmitted with the message, unless active_local_sender_retain is
2312 set. (This can only be true if active_local_from_check is false.) If there
2313 are any resent- headers in the message, apply this rule to Resent-Sender:
2314 instead of Sender:. Messages with multiple resent- header sets cannot be
2315 tidily handled. (For this reason, at least one MUA - Pine - turns old
2316 resent- headers into X-resent- headers when resending, leaving just one
2320 h->type = ((!active_local_sender_retain &&
2322 (sender_local && !trusted_caller && !suppress_local_fixups)
2326 (!resents_exist||is_resent))?
2327 htype_old : htype_sender;
2330 /* Remember the Subject: header for logging. There is no Resent-Subject */
2336 /* "To:" gets flagged, and the existence of a recipient header is noted,
2337 whether it's resent- or not. */
2342 to_or_cc_header_exists = TRUE;
2348 /* Extract recipients from the headers if that is required (the -t option).
2349 Note that this is documented as being done *before* any address rewriting takes
2350 place. There are two possibilities:
2352 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2353 recipients already listed are to be REMOVED from the message. Smail 3 works
2354 like this. We need to build a non-recipients tree for that list, because in
2355 subsequent processing this data is held in a tree and that's what the
2356 spool_write_header() function expects. Make sure that non-recipient addresses
2357 are fully qualified and rewritten if necessary.
2359 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2360 those in the command line arguments (and it is rumoured some other MTAs do
2361 this). Therefore, there is an option to make Exim behave this way.
2363 *** Notes on "Resent-" header lines ***
2365 The presence of resent-headers in the message makes -t horribly ambiguous.
2366 Experiments with sendmail showed that it uses recipients for all resent-
2367 headers, totally ignoring the concept of "sets of resent- headers" as described
2368 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2369 with all the addresses in one instance of each header.
2371 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2372 error for -t if there were resent- headers in the message. However, after a
2373 discussion on the mailing list, I've learned that there are MUAs that use
2374 resent- headers with -t, and also that the stuff about sets of resent- headers
2375 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2376 message with -t and resent- header lines makes sure that only *its* resent-
2377 headers are present; previous ones are often renamed as X-resent- for example.
2379 Consequently, Exim has been changed so that, if any resent- header lines are
2380 present, the recipients are taken from all of the appropriate resent- lines,
2381 and not from the ordinary To:, Cc:, etc. */
2386 error_block **bnext = &bad_addresses;
2388 if (extract_addresses_remove_arguments)
2390 while (recipients_count-- > 0)
2392 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2393 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2394 tree_add_nonrecipient(s);
2396 recipients_list = NULL;
2397 recipients_count = recipients_list_max = 0;
2400 /* Now scan the headers */
2402 for (h = header_list->next; h; h = h->next)
2404 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2405 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2407 uschar *s = Ustrchr(h->text, ':') + 1;
2408 while (isspace(*s)) s++;
2410 parse_allow_group = TRUE; /* Allow address group syntax */
2414 uschar *ss = parse_find_address_end(s, FALSE);
2415 uschar *recipient, *errmess, *p, *pp;
2416 int start, end, domain;
2418 /* Check on maximum */
2420 if (recipients_max > 0 && ++rcount > recipients_max)
2422 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2423 US"message rejected: ", error_rc, stdin, NULL);
2424 /* Does not return */
2427 /* Make a copy of the address, and remove any internal newlines. These
2428 may be present as a result of continuations of the header line. The
2429 white space that follows the newline must not be removed - it is part
2432 pp = recipient = store_get(ss - s + 1);
2433 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2438 BOOL b = allow_utf8_domains;
2439 allow_utf8_domains = TRUE;
2441 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2445 if (string_is_utf8(recipient))
2446 message_smtputf8 = TRUE;
2448 allow_utf8_domains = b;
2452 /* Keep a list of all the bad addresses so we can send a single
2453 error message at the end. However, an empty address is not an error;
2454 just ignore it. This can come from an empty group list like
2456 To: Recipients of list:;
2458 If there are no recipients at all, an error will occur later. */
2460 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2462 int len = Ustrlen(s);
2463 error_block *b = store_get(sizeof(error_block));
2464 while (len > 0 && isspace(s[len-1])) len--;
2466 b->text1 = string_printing(string_copyn(s, len));
2472 /* If the recipient is already in the nonrecipients tree, it must
2473 have appeared on the command line with the option extract_addresses_
2474 remove_arguments set. Do not add it to the recipients, and keep a note
2475 that this has happened, in order to give a better error if there are
2476 no recipients left. */
2478 else if (recipient != NULL)
2480 if (tree_search(tree_nonrecipients, recipient) == NULL)
2481 receive_add_recipient(recipient, -1);
2483 extracted_ignored = TRUE;
2486 /* Move on past this address */
2488 s = ss + (*ss? 1:0);
2489 while (isspace(*s)) s++;
2490 } /* Next address */
2492 parse_allow_group = FALSE; /* Reset group syntax flags */
2493 parse_found_group = FALSE;
2495 /* If this was the bcc: header, mark it "old", which means it
2496 will be kept on the spool, but not transmitted as part of the
2499 if (h->type == htype_bcc) h->type = htype_old;
2500 } /* For appropriate header line */
2501 } /* For each header line */
2505 /* Now build the unique message id. This has changed several times over the
2506 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2507 Retaining all the history in the comment has become too unwieldy - read
2508 previous release sources if you want it.
2510 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2511 The first part is the current time, in seconds. The second part is the current
2512 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2513 can hold a number in the range 0-3843. It used to be a computed sequence
2514 number, but is now the fractional component of the current time in units of
2515 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2516 received, Exim ensures that the timer has ticked at the appropriate level
2517 before proceeding, to avoid duplication if the pid happened to be re-used
2518 within the same time period. It seems likely that most messages will take at
2519 least half a millisecond to be received, so no delay will normally be
2520 necessary. At least for some time...
2522 There is a modification when localhost_number is set. Formerly this was allowed
2523 to be as large as 255. Now it is restricted to the range 0-16, and the final
2524 component of the message id becomes (localhost_number * 200) + fractional time
2525 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2527 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2528 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2529 still allows the tttttt field to hold a large enough number to last for some
2530 more decades, and the final two-digit field can hold numbers up to 1295, which
2531 is enough for milliseconds (instead of 1/2000 of a second).
2533 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2534 pid, so it is probably safe because pids have to be positive. The
2535 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2536 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2538 Note that string_base62() returns its data in a static storage block, so it
2539 must be copied before calling string_base62() again. It always returns exactly
2542 There doesn't seem to be anything in the RFC which requires a message id to
2543 start with a letter, but Smail was changed to ensure this. The external form of
2544 the message id (as supplied by string expansion) therefore starts with an
2545 additional leading 'E'. The spool file names do not include this leading
2546 letter and it is not used internally.
2548 NOTE: If ever the format of message ids is changed, the regular expression for
2549 checking that a string is in this format must be updated in a corresponding
2550 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2551 must also be changed to reflect the correct string length. Then, of course,
2552 other programs that rely on the message id format will need updating too. */
2554 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2555 message_id[6] = '-';
2556 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2558 /* Deal with the case where the host number is set. The value of the number was
2559 checked when it was read, to ensure it isn't too big. The timing granularity is
2560 left in id_resolution so that an appropriate wait can be done after receiving
2561 the message, if necessary (we hope it won't be). */
2563 if (host_number_string != NULL)
2565 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2566 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2567 string_base62((long int)(
2568 host_number * (1000000/id_resolution) +
2569 message_id_tv.tv_usec/id_resolution)) + 4);
2572 /* Host number not set: final field is just the fractional time at an
2573 appropriate resolution. */
2577 id_resolution = (BASE_62 == 62)? 500 : 1000;
2578 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2579 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2582 /* Add the current message id onto the current process info string if
2585 (void)string_format(process_info + process_info_len,
2586 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2588 /* If we are using multiple input directories, set up the one for this message
2589 to be the least significant base-62 digit of the time of arrival. Otherwise
2590 ensure that it is an empty string. */
2592 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2594 /* Now that we have the message-id, if there is no message-id: header, generate
2595 one, but only for local (without suppress_local_fixups) or submission mode
2596 messages. This can be user-configured if required, but we had better flatten
2597 any illegal characters therein. */
2599 if (msgid_header == NULL &&
2600 ((sender_host_address == NULL && !suppress_local_fixups)
2601 || submission_mode))
2604 uschar *id_text = US"";
2605 uschar *id_domain = primary_hostname;
2607 /* Permit only letters, digits, dots, and hyphens in the domain */
2609 if (message_id_domain != NULL)
2611 uschar *new_id_domain = expand_string(message_id_domain);
2612 if (new_id_domain == NULL)
2614 if (!expand_string_forcedfail)
2615 log_write(0, LOG_MAIN|LOG_PANIC,
2616 "expansion of \"%s\" (message_id_header_domain) "
2617 "failed: %s", message_id_domain, expand_string_message);
2619 else if (*new_id_domain != 0)
2621 id_domain = new_id_domain;
2622 for (p = id_domain; *p != 0; p++)
2623 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2627 /* Permit all characters except controls and RFC 2822 specials in the
2628 additional text part. */
2630 if (message_id_text != NULL)
2632 uschar *new_id_text = expand_string(message_id_text);
2633 if (new_id_text == NULL)
2635 if (!expand_string_forcedfail)
2636 log_write(0, LOG_MAIN|LOG_PANIC,
2637 "expansion of \"%s\" (message_id_header_text) "
2638 "failed: %s", message_id_text, expand_string_message);
2640 else if (*new_id_text != 0)
2642 id_text = new_id_text;
2643 for (p = id_text; *p != 0; p++)
2644 if (mac_iscntrl_or_special(*p)) *p = '-';
2648 /* Add the header line
2649 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2650 * appended, to preserve classical expectations of header ordering. */
2652 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2653 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2654 (*id_text == 0)? "" : ".", id_text, id_domain);
2657 /* If we are to log recipients, keep a copy of the raw ones before any possible
2658 rewriting. Must copy the count, because later ACLs and the local_scan()
2659 function may mess with the real recipients. */
2661 if (LOGGING(received_recipients))
2663 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2664 for (i = 0; i < recipients_count; i++)
2665 raw_recipients[i] = string_copy(recipients_list[i].address);
2666 raw_recipients_count = recipients_count;
2669 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2670 recipients will get here only if the conditions were right (allow_unqualified_
2671 recipient is TRUE). */
2673 for (i = 0; i < recipients_count; i++)
2674 recipients_list[i].address =
2675 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2676 global_rewrite_rules, rewrite_existflags);
2678 /* If there is no From: header, generate one for local (without
2679 suppress_local_fixups) or submission_mode messages. If there is no sender
2680 address, but the sender is local or this is a local delivery error, use the
2681 originator login. This shouldn't happen for genuine bounces, but might happen
2682 for autoreplies. The addition of From: must be done *before* checking for the
2683 possible addition of a Sender: header, because untrusted_set_sender allows an
2684 untrusted user to set anything in the envelope (which might then get info
2685 From:) but we still want to ensure a valid Sender: if it is required. */
2687 if (from_header == NULL &&
2688 ((sender_host_address == NULL && !suppress_local_fixups)
2689 || submission_mode))
2691 uschar *oname = US"";
2693 /* Use the originator_name if this is a locally submitted message and the
2694 caller is not trusted. For trusted callers, use it only if -F was used to
2695 force its value or if we have a non-SMTP message for which -f was not used
2696 to set the sender. */
2698 if (sender_host_address == NULL)
2700 if (!trusted_caller || sender_name_forced ||
2701 (!smtp_input && !sender_address_forced))
2702 oname = originator_name;
2705 /* For non-locally submitted messages, the only time we use the originator
2706 name is when it was forced by the /name= option on control=submission. */
2710 if (submission_name != NULL) oname = submission_name;
2713 /* Envelope sender is empty */
2715 if (sender_address[0] == 0)
2717 uschar *fromstart, *fromend;
2719 fromstart = string_sprintf("%sFrom: %s%s", resent_prefix,
2720 oname, (oname[0] == 0)? "" : " <");
2721 fromend = (oname[0] == 0)? US"" : US">";
2723 if (sender_local || local_error_message)
2725 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2726 local_part_quote(originator_login), qualify_domain_sender,
2729 else if (submission_mode && authenticated_id != NULL)
2731 if (submission_domain == NULL)
2733 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2734 local_part_quote(authenticated_id), qualify_domain_sender,
2737 else if (submission_domain[0] == 0) /* empty => whole address set */
2739 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2744 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2745 local_part_quote(authenticated_id), submission_domain,
2748 from_header = header_last; /* To get it checked for Sender: */
2752 /* There is a non-null envelope sender. Build the header using the original
2753 sender address, before any rewriting that might have been done while
2758 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2760 (oname[0] == 0)? "" : " <",
2761 (sender_address_unrewritten == NULL)?
2762 sender_address : sender_address_unrewritten,
2763 (oname[0] == 0)? "" : ">");
2765 from_header = header_last; /* To get it checked for Sender: */
2770 /* If the sender is local (without suppress_local_fixups), or if we are in
2771 submission mode and there is an authenticated_id, check that an existing From:
2772 is correct, and if not, generate a Sender: header, unless disabled. Any
2773 previously-existing Sender: header was removed above. Note that sender_local,
2774 as well as being TRUE if the caller of exim is not trusted, is also true if a
2775 trusted caller did not supply a -f argument for non-smtp input. To allow
2776 trusted callers to forge From: without supplying -f, we have to test explicitly
2777 here. If the From: header contains more than one address, then the call to
2778 parse_extract_address fails, and a Sender: header is inserted, as required. */
2780 if (from_header != NULL &&
2781 (active_local_from_check &&
2782 ((sender_local && !trusted_caller && !suppress_local_fixups) ||
2783 (submission_mode && authenticated_id != NULL))
2786 BOOL make_sender = TRUE;
2787 int start, end, domain;
2789 uschar *from_address =
2790 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2791 &start, &end, &domain, FALSE);
2792 uschar *generated_sender_address;
2794 if (submission_mode)
2796 if (submission_domain == NULL)
2798 generated_sender_address = string_sprintf("%s@%s",
2799 local_part_quote(authenticated_id), qualify_domain_sender);
2801 else if (submission_domain[0] == 0) /* empty => full address */
2803 generated_sender_address = string_sprintf("%s",
2808 generated_sender_address = string_sprintf("%s@%s",
2809 local_part_quote(authenticated_id), submission_domain);
2813 generated_sender_address = string_sprintf("%s@%s",
2814 local_part_quote(originator_login), qualify_domain_sender);
2816 /* Remove permitted prefixes and suffixes from the local part of the From:
2817 address before doing the comparison with the generated sender. */
2819 if (from_address != NULL)
2822 uschar *at = (domain == 0)? NULL : from_address + domain - 1;
2824 if (at != NULL) *at = 0;
2825 from_address += route_check_prefix(from_address, local_from_prefix);
2826 slen = route_check_suffix(from_address, local_from_suffix);
2829 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2830 from_address += slen;
2832 if (at != NULL) *at = '@';
2834 if (strcmpic(generated_sender_address, from_address) == 0 ||
2835 (domain == 0 && strcmpic(from_address, originator_login) == 0))
2836 make_sender = FALSE;
2839 /* We have to cause the Sender header to be rewritten if there are
2840 appropriate rewriting rules. */
2844 if (submission_mode && submission_name == NULL)
2845 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2846 generated_sender_address);
2848 header_add(htype_sender, "%sSender: %s <%s>\n",
2850 submission_mode? submission_name : originator_name,
2851 generated_sender_address);
2854 /* Ensure that a non-null envelope sender address corresponds to the
2855 submission mode sender address. */
2857 if (submission_mode && sender_address[0] != 0)
2859 if (sender_address_unrewritten == NULL)
2860 sender_address_unrewritten = sender_address;
2861 sender_address = generated_sender_address;
2862 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2863 log_write(L_address_rewrite, LOG_MAIN,
2864 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2865 sender_address_unrewritten, generated_sender_address);
2869 /* If there are any rewriting rules, apply them to the sender address, unless
2870 it has already been rewritten as part of verification for SMTP input. */
2872 if (global_rewrite_rules != NULL && sender_address_unrewritten == NULL &&
2873 sender_address[0] != 0)
2875 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2876 global_rewrite_rules, rewrite_existflags);
2877 DEBUG(D_receive|D_rewrite)
2878 debug_printf("rewritten sender = %s\n", sender_address);
2882 /* The headers must be run through rewrite_header(), because it ensures that
2883 addresses are fully qualified, as well as applying any rewriting rules that may
2886 Qualification of header addresses in a message from a remote host happens only
2887 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2888 appropriate. For local messages, qualification always happens, unless -bnq is
2889 used to explicitly suppress it. No rewriting is done for an unqualified address
2890 that is left untouched.
2892 We start at the second header, skipping our own Received:. This rewriting is
2893 documented as happening *after* recipient addresses are taken from the headers
2894 by the -t command line option. An added Sender: gets rewritten here. */
2896 for (h = header_list->next; h; h = h->next)
2898 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2899 rewrite_existflags, TRUE);
2904 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2905 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2906 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2907 exists, this applies to the set of resent- headers rather than the normal set.
2909 The requirement for a recipient header has been removed in RFC 2822. At this
2910 point in the code, earlier versions of Exim added a To: header for locally
2911 submitted messages, and an empty Bcc: header for others. In the light of the
2912 changes in RFC 2822, this was dropped in November 2003. */
2915 /* If there is no date header, generate one if the message originates locally
2916 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2917 submission mode flag is set. Messages without Date: are not valid, but it seems
2918 to be more confusing if Exim adds one to all remotely-originated messages.
2919 As per Message-Id, we prepend if resending, else append.
2922 if (!date_header_exists &&
2923 ((sender_host_address == NULL && !suppress_local_fixups)
2924 || submission_mode))
2925 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2926 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2928 search_tidyup(); /* Free any cached resources */
2930 /* Show the complete set of headers if debugging. Note that the first one (the
2931 new Received:) has not yet been set. */
2935 debug_printf(">>Headers after rewriting and local additions:\n");
2936 for (h = header_list->next; h != NULL; h = h->next)
2937 debug_printf("%c %s", h->type, h->text);
2941 /* The headers are now complete in store. If we are running in filter
2942 testing mode, that is all this function does. Return TRUE if the message
2943 ended with a dot. */
2945 if (filter_test != FTEST_NONE)
2947 process_info[process_info_len] = 0;
2948 return message_ended == END_DOT;
2951 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2952 think more if it could be handled. Cannot do onward CHUNKING unless
2953 inbound is, but inbound chunking ought to be ok with outbound plain.
2954 Could we do onward CHUNKING given inbound CHUNKING?
2956 if (chunking_state > CHUNKING_OFFERED)
2957 cancel_cutthrough_connection("chunking active");
2959 /* Cutthrough delivery:
2960 We have to create the Received header now rather than at the end of reception,
2961 so the timestamp behaviour is a change to the normal case.
2962 XXX Ensure this gets documented XXX.
2963 Having created it, send the headers to the destination. */
2964 if (cutthrough.fd >= 0)
2966 if (received_count > received_headers_max)
2968 cancel_cutthrough_connection("too many headers");
2969 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
2970 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2971 "Too many \"Received\" headers",
2973 (sender_fullhost == NULL)? "" : " H=",
2974 (sender_fullhost == NULL)? US"" : sender_fullhost,
2975 (sender_ident == NULL)? "" : " U=",
2976 (sender_ident == NULL)? US"" : sender_ident);
2977 message_id[0] = 0; /* Indicate no message accepted */
2978 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
2979 goto TIDYUP; /* Skip to end of function */
2981 received_header_gen();
2982 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
2983 (void) cutthrough_headers_send();
2987 /* Open a new spool file for the data portion of the message. We need
2988 to access it both via a file descriptor and a stream. Try to make the
2989 directory if it isn't there. */
2991 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
2992 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
2994 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
2996 if (errno == ENOENT)
2998 (void) directory_make(spool_directory,
2999 spool_sname(US"input", message_subdir),
3000 INPUT_DIRECTORY_MODE, TRUE);
3001 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3004 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3005 spool_name, strerror(errno));
3008 /* Make sure the file's group is the Exim gid, and double-check the mode
3009 because the group setting doesn't always get set automatically. */
3011 if (fchown(data_fd, exim_uid, exim_gid))
3012 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3013 "Failed setting ownership on spool file %s: %s",
3014 spool_name, strerror(errno));
3015 (void)fchmod(data_fd, SPOOL_MODE);
3017 /* We now have data file open. Build a stream for it and lock it. We lock only
3018 the first line of the file (containing the message ID) because otherwise there
3019 are problems when Exim is run under Cygwin (I'm told). See comments in
3020 spool_in.c, where the same locking is done. */
3022 data_file = fdopen(data_fd, "w+");
3023 lock_data.l_type = F_WRLCK;
3024 lock_data.l_whence = SEEK_SET;
3025 lock_data.l_start = 0;
3026 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3028 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3029 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3030 errno, strerror(errno));
3032 /* We have an open, locked data file. Write the message id to it to make it
3033 self-identifying. Then read the remainder of the input of this message and
3034 write it to the data file. If the variable next != NULL, it contains the first
3035 data line (which was read as a header but then turned out not to have the right
3036 format); write it (remembering that it might contain binary zeros). The result
3037 of fwrite() isn't inspected; instead we call ferror() below. */
3039 fprintf(data_file, "%s-D\n", message_id);
3042 uschar *s = next->text;
3043 int len = next->slen;
3044 len = fwrite(s, 1, len, data_file); len = len; /* compiler quietening */
3045 body_linecount++; /* Assumes only 1 line */
3048 /* Note that we might already be at end of file, or the logical end of file
3049 (indicated by '.'), or might have encountered an error while writing the
3050 message id or "next" line. */
3052 if (!ferror(data_file) && !(receive_feof)() && message_ended != END_DOT)
3056 message_ended = chunking_state > CHUNKING_OFFERED
3057 ? read_message_bdat_smtp(data_file)
3058 : read_message_data_smtp(data_file);
3059 receive_linecount++; /* The terminating "." line */
3061 else message_ended = read_message_data(data_file);
3063 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3064 message_linecount += body_linecount;
3066 switch (message_ended)
3068 /* Handle premature termination of SMTP */
3073 Uunlink(spool_name); /* Lose data file when closed */
3074 cancel_cutthrough_connection("sender closed connection");
3075 message_id[0] = 0; /* Indicate no message accepted */
3076 smtp_reply = handle_lost_connection(US"");
3078 goto TIDYUP; /* Skip to end of function */
3082 /* Handle message that is too big. Don't use host_or_ident() in the log
3083 message; we want to see the ident value even for non-remote messages. */
3086 Uunlink(spool_name); /* Lose the data file when closed */
3087 cancel_cutthrough_connection("mail too big");
3088 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3090 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3091 "message too big: read=%d max=%d",
3093 (sender_fullhost == NULL)? "" : " H=",
3094 (sender_fullhost == NULL)? US"" : sender_fullhost,
3095 (sender_ident == NULL)? "" : " U=",
3096 (sender_ident == NULL)? US"" : sender_ident,
3098 thismessage_size_limit);
3102 smtp_reply = US"552 Message size exceeds maximum permitted";
3103 message_id[0] = 0; /* Indicate no message accepted */
3104 goto TIDYUP; /* Skip to end of function */
3108 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3109 give_local_error(ERRMESS_TOOBIG,
3110 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3111 US"message rejected: ", error_rc, data_file, header_list);
3112 /* Does not return */
3116 /* Handle bad BDAT protocol sequence */
3119 Uunlink(spool_name); /* Lose the data file when closed */
3120 cancel_cutthrough_connection("sender protocol error");
3121 smtp_reply = US""; /* Response already sent */
3122 message_id[0] = 0; /* Indicate no message accepted */
3123 goto TIDYUP; /* Skip to end of function */
3127 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3128 example, there may be some expansion in an ACL that uses a timer.) */
3130 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3132 /* The message body has now been read into the data file. Call fflush() to
3133 empty the buffers in C, and then call fsync() to get the data written out onto
3134 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3135 having to do this). If there was an I/O error on either input or output,
3136 attempt to send an error message, and unlink the spool file. For non-SMTP input
3137 we can then give up. Note that for SMTP input we must swallow the remainder of
3138 the input in cases of output errors, since the far end doesn't expect to see
3139 anything until the terminating dot line is sent. */
3141 if (fflush(data_file) == EOF || ferror(data_file) ||
3142 EXIMfsync(fileno(data_file)) < 0 || (receive_ferror)())
3144 uschar *msg_errno = US strerror(errno);
3145 BOOL input_error = (receive_ferror)() != 0;
3146 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3147 input_error? "Input read" : "Spool write",
3149 (sender_fullhost != NULL)? sender_fullhost : sender_ident);
3151 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3152 Uunlink(spool_name); /* Lose the data file */
3153 cancel_cutthrough_connection("error writing spoolfile");
3158 smtp_reply = US"451 Error while reading input data";
3161 smtp_reply = US"451 Error while writing spool file";
3162 receive_swallow_smtp();
3164 message_id[0] = 0; /* Indicate no message accepted */
3165 goto TIDYUP; /* Skip to end of function */
3170 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3171 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, data_file,
3173 /* Does not return */
3178 /* No I/O errors were encountered while writing the data file. */
3180 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3183 /* If there were any bad addresses extracted by -t, or there were no recipients
3184 left after -t, send a message to the sender of this message, or write it to
3185 stderr if the error handling option is set that way. Note that there may
3186 legitimately be no recipients for an SMTP message if they have all been removed
3189 We need to rewind the data file in order to read it. In the case of no
3190 recipients or stderr error writing, throw the data file away afterwards, and
3191 exit. (This can't be SMTP, which always ensures there's at least one
3192 syntactically good recipient address.) */
3194 if (extract_recip && (bad_addresses != NULL || recipients_count == 0))
3198 if (recipients_count == 0) debug_printf("*** No recipients\n");
3199 if (bad_addresses != NULL)
3201 error_block *eblock = bad_addresses;
3202 debug_printf("*** Bad address(es)\n");
3203 while (eblock != NULL)
3205 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3206 eblock = eblock->next;
3211 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3213 /* If configured to send errors to the sender, but this fails, force
3214 a failure error code. We use a special one for no recipients so that it
3215 can be detected by the autoreply transport. Otherwise error_rc is set to
3216 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3217 it is EXIT_SUCCESS. */
3219 if (error_handling == ERRORS_SENDER)
3221 if (!moan_to_sender(
3222 (bad_addresses == NULL)?
3223 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3224 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3225 bad_addresses, header_list, data_file, FALSE))
3226 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3230 if (bad_addresses == NULL)
3232 if (extracted_ignored)
3233 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3235 fprintf(stderr, "exim: no recipients in message\n");
3239 fprintf(stderr, "exim: invalid address%s",
3240 (bad_addresses->next == NULL)? ":" : "es:\n");
3241 while (bad_addresses != NULL)
3243 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3244 bad_addresses->text2);
3245 bad_addresses = bad_addresses->next;
3250 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3252 Uunlink(spool_name);
3253 (void)fclose(data_file);
3254 exim_exit(error_rc);
3258 /* Data file successfully written. Generate text for the Received: header by
3259 expanding the configured string, and adding a timestamp. By leaving this
3260 operation till now, we ensure that the timestamp is the time that message
3261 reception was completed. However, this is deliberately done before calling the
3262 data ACL and local_scan().
3264 This Received: header may therefore be inspected by the data ACL and by code in
3265 the local_scan() function. When they have run, we update the timestamp to be
3266 the final time of reception.
3268 If there is just one recipient, set up its value in the $received_for variable
3269 for use when we generate the Received: header.
3271 Note: the checking for too many Received: headers is handled by the delivery
3273 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3275 if (received_header->text == NULL) /* Non-cutthrough case */
3277 received_header_gen();
3279 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3281 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3282 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3284 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3285 now, before running the DATA ACL. */
3287 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3290 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3291 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3293 /* If an ACL is specified for checking things at this stage of reception of a
3294 message, run it, unless all the recipients were removed by "discard" in earlier
3295 ACLs. That is the only case in which recipients_count can be zero at this
3296 stage. Set deliver_datafile to point to the data file so that $message_body and
3297 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3300 deliver_datafile = data_fd;
3303 enable_dollar_recipients = TRUE;
3305 if (recipients_count == 0)
3306 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3310 /* Handle interactive SMTP messages */
3312 if (smtp_input && !smtp_batched_input)
3315 #ifndef DISABLE_DKIM
3316 if (!dkim_disable_verify)
3318 /* Finish verification, this will log individual signature results to
3320 dkim_exim_verify_finish();
3322 /* Check if we must run the DKIM ACL */
3323 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3325 uschar *dkim_verify_signers_expanded =
3326 expand_string(dkim_verify_signers);
3327 if (!dkim_verify_signers_expanded)
3328 log_write(0, LOG_MAIN|LOG_PANIC,
3329 "expansion of dkim_verify_signers option failed: %s",
3330 expand_string_message);
3335 const uschar *ptr = dkim_verify_signers_expanded;
3336 uschar *item = NULL;
3337 uschar *seen_items = NULL;
3338 int seen_items_size = 0;
3339 int seen_items_offset = 0;
3340 /* Default to OK when no items are present */
3342 while ((item = string_nextinlist(&ptr, &sep, NULL, 0)))
3344 /* Prevent running ACL for an empty item */
3345 if (!item || !*item) continue;
3347 /* Only run ACL once for each domain or identity,
3348 no matter how often it appears in the expanded list. */
3351 uschar *seen_item = NULL;
3352 const uschar *seen_items_list = seen_items;
3353 BOOL seen_this_item = FALSE;
3355 while ((seen_item = string_nextinlist(&seen_items_list, &sep,
3357 if (Ustrcmp(seen_item,item) == 0)
3359 seen_this_item = TRUE;
3366 debug_printf("acl_smtp_dkim: skipping signer %s, "
3367 "already seen\n", item);
3371 seen_items = string_append(seen_items, &seen_items_size,
3372 &seen_items_offset, 1, ":");
3375 seen_items = string_append(seen_items, &seen_items_size,
3376 &seen_items_offset, 1, item);
3377 seen_items[seen_items_offset] = '\0';
3380 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3383 dkim_exim_acl_setup(item);
3384 rc = acl_check(ACL_WHERE_DKIM, NULL, acl_smtp_dkim,
3385 &user_msg, &log_msg);
3390 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3391 "skipping remaining items\n", rc, item);
3392 cancel_cutthrough_connection("dkim acl not ok");
3396 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3399 recipients_count = 0;
3400 blackholed_by = US"DKIM ACL";
3401 if (log_msg != NULL)
3402 blackhole_log_msg = string_sprintf(": %s", log_msg);
3406 Uunlink(spool_name);
3407 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3408 smtp_yield = FALSE; /* No more messages after dropped connection */
3409 smtp_reply = US""; /* Indicate reply already sent */
3410 message_id[0] = 0; /* Indicate no message accepted */
3411 goto TIDYUP; /* Skip to end of function */
3416 #endif /* DISABLE_DKIM */
3418 #ifdef WITH_CONTENT_SCAN
3419 if (recipients_count > 0 &&
3420 acl_smtp_mime != NULL &&
3421 !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by))
3423 #endif /* WITH_CONTENT_SCAN */
3425 #ifdef EXPERIMENTAL_DMARC
3426 dmarc_up = dmarc_store_data(from_header);
3427 #endif /* EXPERIMENTAL_DMARC */
3429 #ifndef DISABLE_PRDR
3430 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3434 int all_fail = FAIL;
3436 smtp_printf("353 PRDR content analysis beginning\r\n");
3437 /* Loop through recipients, responses must be in same order received */
3438 for (c = 0; recipients_count > c; c++)
3440 uschar * addr= recipients_list[c].address;
3441 uschar * msg= US"PRDR R=<%s> %s";
3444 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3445 addr, c+1, recipients_count);
3446 rc = acl_check(ACL_WHERE_PRDR, addr,
3447 acl_smtp_data_prdr, &user_msg, &log_msg);
3449 /* If any recipient rejected content, indicate it in final message */
3451 /* If all recipients rejected, indicate in final message */
3456 case OK: case DISCARD: code = US"250"; break;
3457 case DEFER: code = US"450"; break;
3458 default: code = US"550"; break;
3460 if (user_msg != NULL)
3461 smtp_user_msg(code, user_msg);
3466 case OK: case DISCARD:
3467 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3469 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3471 msg = string_sprintf(CS msg, addr, "refusal"); break;
3473 smtp_user_msg(code, msg);
3475 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3476 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3477 else log_write(0, LOG_MAIN, "%s", CS msg);
3479 if (rc != OK) { receive_remove_recipient(addr); c--; }
3481 /* Set up final message, used if data acl gives OK */
3482 smtp_reply = string_sprintf("%s id=%s message %s",
3483 all_fail == FAIL ? US"550" : US"250",
3486 ? US"rejected for all recipients"
3489 : US"accepted for some recipients");
3490 if (recipients_count == 0)
3492 message_id[0] = 0; /* Indicate no message accepted */
3497 prdr_requested = FALSE;
3498 #endif /* !DISABLE_PRDR */
3500 /* Check the recipients count again, as the MIME ACL might have changed
3503 if (acl_smtp_data != NULL && recipients_count > 0)
3505 rc = acl_check(ACL_WHERE_DATA, NULL, acl_smtp_data, &user_msg, &log_msg);
3506 add_acl_headers(ACL_WHERE_DATA, US"DATA");
3509 recipients_count = 0;
3510 blackholed_by = US"DATA ACL";
3511 if (log_msg != NULL)
3512 blackhole_log_msg = string_sprintf(": %s", log_msg);
3513 cancel_cutthrough_connection("data acl discard");
3517 Uunlink(spool_name);
3518 cancel_cutthrough_connection("data acl not ok");
3519 #ifdef WITH_CONTENT_SCAN
3522 #ifdef EXPERIMENTAL_DCC
3525 if (smtp_handle_acl_fail(ACL_WHERE_DATA, rc, user_msg, log_msg) != 0)
3526 smtp_yield = FALSE; /* No more messages after dropped connection */
3527 smtp_reply = US""; /* Indicate reply already sent */
3528 message_id[0] = 0; /* Indicate no message accepted */
3529 goto TIDYUP; /* Skip to end of function */
3534 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3535 we cannot take different actions for permanent and temporary rejections. */
3540 #ifdef WITH_CONTENT_SCAN
3541 if (acl_not_smtp_mime != NULL &&
3542 !run_mime_acl(acl_not_smtp_mime, &smtp_yield, &smtp_reply,
3545 #endif /* WITH_CONTENT_SCAN */
3547 if (acl_not_smtp != NULL)
3549 uschar *user_msg, *log_msg;
3550 rc = acl_check(ACL_WHERE_NOTSMTP, NULL, acl_not_smtp, &user_msg, &log_msg);
3553 recipients_count = 0;
3554 blackholed_by = US"non-SMTP ACL";
3555 if (log_msg != NULL)
3556 blackhole_log_msg = string_sprintf(": %s", log_msg);
3560 Uunlink(spool_name);
3561 #ifdef WITH_CONTENT_SCAN
3564 #ifdef EXPERIMENTAL_DCC
3567 /* The ACL can specify where rejections are to be logged, possibly
3568 nowhere. The default is main and reject logs. */
3570 if (log_reject_target != 0)
3571 log_write(0, log_reject_target, "F=<%s> rejected by non-SMTP ACL: %s",
3572 sender_address, log_msg);
3574 if (user_msg == NULL) user_msg = US"local configuration problem";
3575 if (smtp_batched_input)
3577 moan_smtp_batch(NULL, "%d %s", 550, user_msg);
3578 /* Does not return */
3582 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3583 give_local_error(ERRMESS_LOCAL_ACL, user_msg,
3584 US"message rejected by non-SMTP ACL: ", error_rc, data_file,
3586 /* Does not return */
3589 add_acl_headers(ACL_WHERE_NOTSMTP, US"non-SMTP");
3593 /* The applicable ACLs have been run */
3595 if (deliver_freeze) frozen_by = US"ACL"; /* for later logging */
3596 if (queue_only_policy) queued_by = US"ACL";
3599 #ifdef WITH_CONTENT_SCAN
3603 #ifdef EXPERIMENTAL_DCC
3608 /* The final check on the message is to run the scan_local() function. The
3609 version supplied with Exim always accepts, but this is a hook for sysadmins to
3610 supply their own checking code. The local_scan() function is run even when all
3611 the recipients have been discarded. */
3613 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3615 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3616 deleted, and the incident gets logged. */
3618 os_non_restarting_signal(SIGSEGV, local_scan_crash_handler);
3619 os_non_restarting_signal(SIGFPE, local_scan_crash_handler);
3620 os_non_restarting_signal(SIGILL, local_scan_crash_handler);
3621 os_non_restarting_signal(SIGBUS, local_scan_crash_handler);
3623 DEBUG(D_receive) debug_printf("calling local_scan(); timeout=%d\n",
3624 local_scan_timeout);
3625 local_scan_data = NULL;
3627 os_non_restarting_signal(SIGALRM, local_scan_timeout_handler);
3628 if (local_scan_timeout > 0) alarm(local_scan_timeout);
3629 rc = local_scan(data_fd, &local_scan_data);
3631 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3633 enable_dollar_recipients = FALSE;
3635 store_pool = POOL_MAIN; /* In case changed */
3636 DEBUG(D_receive) debug_printf("local_scan() returned %d %s\n", rc,
3639 os_non_restarting_signal(SIGSEGV, SIG_DFL);
3640 os_non_restarting_signal(SIGFPE, SIG_DFL);
3641 os_non_restarting_signal(SIGILL, SIG_DFL);
3642 os_non_restarting_signal(SIGBUS, SIG_DFL);
3644 /* The length check is paranoia against some runaway code, and also because
3645 (for a success return) lines in the spool file are read into big_buffer. */
3647 if (local_scan_data != NULL)
3649 int len = Ustrlen(local_scan_data);
3650 if (len > LOCAL_SCAN_MAX_RETURN) len = LOCAL_SCAN_MAX_RETURN;
3651 local_scan_data = string_copyn(local_scan_data, len);
3654 if (rc == LOCAL_SCAN_ACCEPT_FREEZE)
3656 if (!deliver_freeze) /* ACL might have already frozen */
3658 deliver_freeze = TRUE;
3659 deliver_frozen_at = time(NULL);
3660 frozen_by = US"local_scan()";
3662 rc = LOCAL_SCAN_ACCEPT;
3664 else if (rc == LOCAL_SCAN_ACCEPT_QUEUE)
3666 if (!queue_only_policy) /* ACL might have already queued */
3668 queue_only_policy = TRUE;
3669 queued_by = US"local_scan()";
3671 rc = LOCAL_SCAN_ACCEPT;
3674 /* Message accepted: remove newlines in local_scan_data because otherwise
3675 the spool file gets corrupted. Ensure that all recipients are qualified. */
3677 if (rc == LOCAL_SCAN_ACCEPT)
3679 if (local_scan_data != NULL)
3682 for (s = local_scan_data; *s != 0; s++) if (*s == '\n') *s = ' ';
3684 for (i = 0; i < recipients_count; i++)
3686 recipient_item *r = recipients_list + i;
3687 r->address = rewrite_address_qualify(r->address, TRUE);
3688 if (r->errors_to != NULL)
3689 r->errors_to = rewrite_address_qualify(r->errors_to, TRUE);
3691 if (recipients_count == 0 && blackholed_by == NULL)
3692 blackholed_by = US"local_scan";
3695 /* Message rejected: newlines permitted in local_scan_data to generate
3696 multiline SMTP responses. */
3700 uschar *istemp = US"";
3706 errmsg = local_scan_data;
3708 Uunlink(spool_name); /* Cancel this message */
3712 log_write(0, LOG_MAIN, "invalid return %d from local_scan(). Temporary "
3713 "rejection given", rc);
3716 case LOCAL_SCAN_REJECT_NOLOGHDR:
3717 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3720 case LOCAL_SCAN_REJECT:
3721 smtp_code = US"550";
3722 if (errmsg == NULL) errmsg = US"Administrative prohibition";
3725 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR:
3726 BIT_CLEAR(log_selector, log_selector_size, Li_rejected_header);
3729 case LOCAL_SCAN_TEMPREJECT:
3731 smtp_code = US"451";
3732 if (errmsg == NULL) errmsg = US"Temporary local problem";
3733 istemp = US"temporarily ";
3737 s = string_append(s, &size, &sptr, 2, US"F=",
3738 (sender_address[0] == 0)? US"<>" : sender_address);
3739 s = add_host_info_for_log(s, &size, &sptr);
3742 log_write(0, LOG_MAIN|LOG_REJECT, "%s %srejected by local_scan(): %.256s",
3743 s, istemp, string_printing(errmsg));
3747 if (!smtp_batched_input)
3749 smtp_respond(smtp_code, 3, TRUE, errmsg);
3750 message_id[0] = 0; /* Indicate no message accepted */
3751 smtp_reply = US""; /* Indicate reply already sent */
3752 goto TIDYUP; /* Skip to end of function */
3756 moan_smtp_batch(NULL, "%s %s", smtp_code, errmsg);
3757 /* Does not return */
3762 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3763 give_local_error(ERRMESS_LOCAL_SCAN, errmsg,
3764 US"message rejected by local scan code: ", error_rc, data_file,
3766 /* Does not return */
3770 /* Reset signal handlers to ignore signals that previously would have caused
3771 the message to be abandoned. */
3773 signal(SIGTERM, SIG_IGN);
3774 signal(SIGINT, SIG_IGN);
3777 /* Ensure the first time flag is set in the newly-received message. */
3779 deliver_firsttime = TRUE;
3781 #ifdef EXPERIMENTAL_BRIGHTMAIL
3783 { /* rewind data file */
3784 lseek(data_fd, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3785 bmi_verdicts = bmi_process_message(header_list, data_fd);
3789 /* Update the timestamp in our Received: header to account for any time taken by
3790 an ACL or by local_scan(). The new time is the time that all reception
3791 processing is complete. */
3793 timestamp = expand_string(US"${tod_full}");
3794 tslen = Ustrlen(timestamp);
3796 memcpy(received_header->text + received_header->slen - tslen - 1,
3799 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3803 deliver_freeze = FALSE;
3804 queue_only_policy = FALSE;
3807 /* Keep the data file open until we have written the header file, in order to
3808 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3809 don't write the header file, and we unlink the data file. If writing the header
3810 file fails, we have failed to accept this message. */
3812 if (host_checking || blackholed_by != NULL)
3815 Uunlink(spool_name);
3816 msg_size = 0; /* Compute size for log line */
3817 for (h = header_list; h != NULL; h = h->next)
3818 if (h->type != '*') msg_size += h->slen;
3821 /* Write the -H file */
3824 if ((msg_size = spool_write_header(message_id, SW_RECEIVING, &errmsg)) < 0)
3826 log_write(0, LOG_MAIN, "Message abandoned: %s", errmsg);
3827 Uunlink(spool_name); /* Lose the data file */
3831 smtp_reply = US"451 Error in writing spool file";
3832 message_id[0] = 0; /* Indicate no message accepted */
3837 fseek(data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3838 give_local_error(ERRMESS_IOERR, errmsg, US"", error_rc, data_file,
3840 /* Does not return */
3845 /* The message has now been successfully received. */
3847 receive_messagecount++;
3849 /* In SMTP sessions we may receive several in one connection. After each one,
3850 we wait for the clock to tick at the level of message-id granularity. This is
3851 so that the combination of time+pid is unique, even on systems where the pid
3852 can be re-used within our time interval. We can't shorten the interval without
3853 re-designing the message-id. See comments above where the message id is
3854 created. This is Something For The Future. */
3856 message_id_tv.tv_usec = (message_id_tv.tv_usec/id_resolution) * id_resolution;
3857 exim_wait_tick(&message_id_tv, id_resolution);
3859 /* Add data size to written header size. We do not count the initial file name
3860 that is in the file, but we do add one extra for the notional blank line that
3861 precedes the data. This total differs from message_size in that it include the
3862 added Received: header and any other headers that got created locally. */
3865 fstat(data_fd, &statbuf);
3867 msg_size += statbuf.st_size - SPOOL_DATA_START_OFFSET + 1;
3869 /* Generate a "message received" log entry. We do this by building up a dynamic
3870 string as required. Since we commonly want to add two items at a time, use a
3871 macro to simplify the coding. We log the arrival of a new message while the
3872 file is still locked, just in case the machine is *really* fast, and delivers
3873 it first! Include any message id that is in the message - since the syntax of a
3874 message id is actually an addr-spec, we can use the parse routine to canonicalize
3879 s = store_get(size);
3881 s = string_append(s, &size, &sptr, 2,
3882 fake_response == FAIL ? US"(= " : US"<= ",
3883 sender_address[0] == 0 ? US"<>" : sender_address);
3884 if (message_reference)
3885 s = string_append(s, &size, &sptr, 2, US" R=", message_reference);
3887 s = add_host_info_for_log(s, &size, &sptr);
3890 if (LOGGING(tls_cipher) && tls_in.cipher)
3891 s = string_append(s, &size, &sptr, 2, US" X=", tls_in.cipher);
3892 if (LOGGING(tls_certificate_verified) && tls_in.cipher)
3893 s = string_append(s, &size, &sptr, 2, US" CV=",
3894 tls_in.certificate_verified ? "yes":"no");
3895 if (LOGGING(tls_peerdn) && tls_in.peerdn)
3896 s = string_append(s, &size, &sptr, 3, US" DN=\"",
3897 string_printing(tls_in.peerdn), US"\"");
3898 if (LOGGING(tls_sni) && tls_in.sni)
3899 s = string_append(s, &size, &sptr, 3, US" SNI=\"",
3900 string_printing(tls_in.sni), US"\"");
3903 if (sender_host_authenticated)
3905 s = string_append(s, &size, &sptr, 2, US" A=", sender_host_authenticated);
3906 if (authenticated_id)
3908 s = string_append(s, &size, &sptr, 2, US":", authenticated_id);
3909 if (LOGGING(smtp_mailauth) && authenticated_sender)
3910 s = string_append(s, &size, &sptr, 2, US":", authenticated_sender);
3914 #ifndef DISABLE_PRDR
3916 s = string_catn(s, &size, &sptr, US" PRDR", 5);
3919 #ifdef SUPPORT_PROXY
3920 if (proxy_session && LOGGING(proxy))
3921 s = string_append(s, &size, &sptr, 2, US" PRX=", proxy_local_address);
3924 if (chunking_state > CHUNKING_OFFERED)
3925 s = string_catn(s, &size, &sptr, US" K", 2);
3927 sprintf(CS big_buffer, "%d", msg_size);
3928 s = string_append(s, &size, &sptr, 2, US" S=", big_buffer);
3930 /* log 8BITMIME mode announced in MAIL_FROM
3934 if (LOGGING(8bitmime))
3936 sprintf(CS big_buffer, "%d", body_8bitmime);
3937 s = string_append(s, &size, &sptr, 2, US" M8S=", big_buffer);
3941 s = string_append(s, &size, &sptr, 2, US" Q=", queue_name);
3943 /* If an addr-spec in a message-id contains a quoted string, it can contain
3944 any characters except " \ and CR and so in particular it can contain NL!
3945 Therefore, make sure we use a printing-characters only version for the log.
3946 Also, allow for domain literals in the message id. */
3951 BOOL save_allow_domain_literals = allow_domain_literals;
3952 allow_domain_literals = TRUE;
3953 old_id = parse_extract_address(Ustrchr(msgid_header->text, ':') + 1,
3954 &errmsg, &start, &end, &domain, FALSE);
3955 allow_domain_literals = save_allow_domain_literals;
3957 s = string_append(s, &size, &sptr, 2, US" id=", string_printing(old_id));
3960 /* If subject logging is turned on, create suitable printing-character
3961 text. By expanding $h_subject: we make use of the MIME decoding. */
3963 if (LOGGING(subject) && subject_header != NULL)
3966 uschar *p = big_buffer;
3967 uschar *ss = expand_string(US"$h_subject:");
3969 /* Backslash-quote any double quotes or backslashes so as to make a
3970 a C-like string, and turn any non-printers into escape sequences. */
3973 if (*ss != 0) for (i = 0; i < 100 && ss[i] != 0; i++)
3975 if (ss[i] == '\"' || ss[i] == '\\') *p++ = '\\';
3980 s = string_append(s, &size, &sptr, 2, US" T=", string_printing(big_buffer));
3983 /* Terminate the string: string_cat() and string_append() leave room, but do
3984 not put the zero in. */
3988 /* Create a message log file if message logs are being used and this message is
3989 not blackholed. Write the reception stuff to it. We used to leave message log
3990 creation until the first delivery, but this has proved confusing for some
3993 if (message_logs && blackholed_by == NULL)
3997 spool_name = spool_fname(US"msglog", message_subdir, message_id, US"");
3999 if ( (fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE)) < 0
4003 (void)directory_make(spool_directory,
4004 spool_sname(US"msglog", message_subdir),
4005 MSGLOG_DIRECTORY_MODE, TRUE);
4006 fd = Uopen(spool_name, O_WRONLY|O_APPEND|O_CREAT, SPOOL_MODE);
4011 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't open message log %s: %s",
4012 spool_name, strerror(errno));
4017 FILE *message_log = fdopen(fd, "a");
4018 if (message_log == NULL)
4020 log_write(0, LOG_MAIN|LOG_PANIC, "Couldn't fdopen message log %s: %s",
4021 spool_name, strerror(errno));
4026 uschar *now = tod_stamp(tod_log);
4027 fprintf(message_log, "%s Received from %s\n", now, s+3);
4028 if (deliver_freeze) fprintf(message_log, "%s frozen by %s\n", now,
4030 if (queue_only_policy) fprintf(message_log,
4031 "%s no immediate delivery: queued%s%s by %s\n", now,
4032 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4034 (void)fclose(message_log);
4039 /* Everything has now been done for a successful message except logging its
4040 arrival, and outputting an SMTP response. While writing to the log, set a flag
4041 to cause a call to receive_bomb_out() if the log cannot be opened. */
4043 receive_call_bombout = TRUE;
4045 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4046 connection has gone away. This can only be done if there is no unconsumed input
4047 waiting in the local input buffer. We can test for this by calling
4048 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4049 input to be sent following the final dot, so the presence of following input is
4052 If the connection is still present, but there is no unread input for the
4053 socket, the result of a select() call will be zero. If, however, the connection
4054 has gone away, or if there is pending input, the result of select() will be
4055 non-zero. The two cases can be distinguished by trying to read the next input
4056 character. If we succeed, we can unread it so that it remains in the local
4057 buffer for handling later. If not, the connection has been lost.
4059 Of course, since TCP/IP is asynchronous, there is always a chance that the
4060 connection will vanish between the time of this test and the sending of the
4061 response, but the chance of this happening should be small. */
4063 if (smtp_input && sender_host_address != NULL && !sender_host_notsocket &&
4064 !receive_smtp_buffered())
4067 fd_set select_check;
4068 FD_ZERO(&select_check);
4069 FD_SET(fileno(smtp_in), &select_check);
4073 if (select(fileno(smtp_in) + 1, &select_check, NULL, NULL, &tv) != 0)
4075 int c = (receive_getc)(GETC_BUFFER_UNLIMITED);
4076 if (c != EOF) (receive_ungetc)(c); else
4078 smtp_notquit_exit(US"connection-lost", NULL, NULL);
4079 smtp_reply = US""; /* No attempt to send a response */
4080 smtp_yield = FALSE; /* Nothing more on this connection */
4082 /* Re-use the log line workspace */
4085 s = string_cat(s, &size, &sptr, US"SMTP connection lost after final dot");
4086 s = add_host_info_for_log(s, &size, &sptr);
4088 log_write(0, LOG_MAIN, "%s", s);
4090 /* Delete the files for this aborted message. */
4092 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4093 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4094 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4101 /* The connection has not gone away; we really are going to take responsibility
4102 for this message. */
4104 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4107 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4108 the sender's dot (below).
4109 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4110 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4111 in which case pass temp-reject back to initiator and dump the files.
4113 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4115 XXX We do not handle queue-only, freezing, or blackholes.
4117 if(cutthrough.fd >= 0)
4119 uschar * msg= cutthrough_finaldot(); /* Ask the target system to accept the message */
4120 /* Logging was done in finaldot() */
4123 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4124 cutthrough_done = ACCEPTED;
4125 break; /* message_id needed for SMTP accept below */
4127 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4128 ... for which, pass back the exact error */
4129 if (cutthrough.defer_pass) smtp_reply = string_copy_malloc(msg);
4132 default: /* Unknown response, or error. Treat as temp-reject. */
4133 cutthrough_done = TMP_REJ; /* Avoid the usual immediate delivery attempt */
4134 break; /* message_id needed for SMTP accept below */
4136 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4137 smtp_reply = string_copy_malloc(msg); /* Pass on the exact error */
4138 cutthrough_done = PERM_REJ;
4143 #ifndef DISABLE_PRDR
4144 if(!smtp_reply || prdr_requested)
4149 log_write(0, LOG_MAIN |
4150 (LOGGING(received_recipients)? LOG_RECIPIENTS : 0) |
4151 (LOGGING(received_sender)? LOG_SENDER : 0),
4154 /* Log any control actions taken by an ACL or local_scan(). */
4156 if (deliver_freeze) log_write(0, LOG_MAIN, "frozen by %s", frozen_by);
4157 if (queue_only_policy) log_write(L_delay_delivery, LOG_MAIN,
4158 "no immediate delivery: queued%s%s by %s",
4159 *queue_name ? " in " : "", *queue_name ? CS queue_name : "",
4162 receive_call_bombout = FALSE;
4164 store_reset(s); /* The store for the main log message can be reused */
4166 /* If the message is frozen, and freeze_tell is set, do the telling. */
4168 if (deliver_freeze && freeze_tell != NULL && freeze_tell[0] != 0)
4170 moan_tell_someone(freeze_tell, NULL, US"Message frozen on arrival",
4171 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4172 message_id, frozen_by, sender_address);
4176 /* Either a message has been successfully received and written to the two spool
4177 files, or an error in writing the spool has occurred for an SMTP message, or
4178 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4179 we will have already given up because there's no point in carrying on!) In
4180 either event, we must now close (and thereby unlock) the data file. In the
4181 successful case, this leaves the message on the spool, ready for delivery. In
4182 the error case, the spool file will be deleted. Then tidy up store, interact
4183 with an SMTP call if necessary, and return.
4185 A fflush() was done earlier in the expectation that any write errors on the
4186 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4187 possible for fclose() to fail - but what to do? What has happened to the lock
4192 process_info[process_info_len] = 0; /* Remove message id */
4193 if (data_file != NULL) (void)fclose(data_file); /* Frees the lock */
4195 /* Now reset signal handlers to their defaults */
4197 signal(SIGTERM, SIG_DFL);
4198 signal(SIGINT, SIG_DFL);
4200 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4201 value, which defaults TRUE - meaning there may be more incoming messages from
4202 this connection. For non-SMTP callers (where there is only ever one message),
4203 the default is FALSE. */
4209 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4210 is set to the response that should be sent. When it is NULL, we generate
4211 default responses. After an ACL error or local_scan() error, the response has
4212 already been sent, and smtp_reply is an empty string to indicate this. */
4214 if (!smtp_batched_input)
4218 if (fake_response != OK)
4219 smtp_respond(fake_response == DEFER ? US"450" : US"550",
4220 3, TRUE, fake_response_text);
4222 /* An OK response is required; use "message" text if present. */
4226 uschar *code = US"250";
4228 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
4229 smtp_respond(code, len, TRUE, user_msg);
4232 /* Default OK response */
4234 else if (chunking_state > CHUNKING_OFFERED)
4236 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4237 chunking_datasize, message_size+message_linecount, message_id);
4238 chunking_state = CHUNKING_OFFERED;
4241 smtp_printf("250 OK id=%s\r\n", message_id);
4245 "\n**** SMTP testing: that is not a real message id!\n\n");
4248 /* smtp_reply is set non-empty */
4250 else if (smtp_reply[0] != 0)
4251 if (fake_response != OK && (smtp_reply[0] == '2'))
4252 smtp_respond((fake_response == DEFER)? US"450" : US"550", 3, TRUE,
4253 fake_response_text);
4255 smtp_printf("%.1024s\r\n", smtp_reply);
4257 switch (cutthrough_done)
4260 log_write(0, LOG_MAIN, "Completed");/* Delivery was done */
4262 /* Delete spool files */
4263 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4264 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4265 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4266 message_id[0] = 0; /* Prevent a delivery from starting */
4270 if (cutthrough.defer_pass)
4272 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-D"));
4273 Uunlink(spool_fname(US"input", message_subdir, message_id, US"-H"));
4274 Uunlink(spool_fname(US"msglog", message_subdir, message_id, US""));
4276 message_id[0] = 0; /* Prevent a delivery from starting */
4280 cutthrough.delivery = FALSE;
4281 cutthrough.defer_pass = FALSE;
4284 /* For batched SMTP, generate an error message on failure, and do
4285 nothing on success. The function moan_smtp_batch() does not return -
4286 it exits from the program with a non-zero return code. */
4288 else if (smtp_reply)
4289 moan_smtp_batch(NULL, "%s", smtp_reply);
4293 /* If blackholing, we can immediately log this message's sad fate. The data
4294 file has already been unlinked, and the header file was never written to disk.
4295 We must now indicate that nothing was received, to prevent a delivery from
4300 const uschar *detail = local_scan_data
4301 ? string_printing(local_scan_data)
4302 : string_sprintf("(%s discarded recipients)", blackholed_by);
4303 log_write(0, LOG_MAIN, "=> blackhole %s%s", detail, blackhole_log_msg);
4304 log_write(0, LOG_MAIN, "Completed");
4308 /* Reset headers so that logging of rejects for a subsequent message doesn't
4309 include them. It is also important to set header_last = NULL before exiting
4310 from this function, as this prevents certain rewrites that might happen during
4311 subsequent verifying (of another incoming message) from trying to add headers
4312 when they shouldn't. */
4314 header_list = header_last = NULL;
4316 return yield; /* TRUE if more messages (SMTP only) */
4319 /* End of receive.c */