1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2017 */
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
"";
28 enum CH_STATE
{LF_SEEN
, MID_LINE
, CR_SEEN
};
31 /*************************************************
32 * Non-SMTP character reading functions *
33 *************************************************/
35 /* These are the default functions that are set up in the variables such as
36 receive_getc initially. They just call the standard functions, passing stdin as
37 the file. (When SMTP input is occurring, different functions are used by
38 changing the pointer variables.) */
41 stdin_getc(unsigned lim
)
49 return ungetc(c
, stdin
);
67 /*************************************************
68 * Check that a set sender is allowed *
69 *************************************************/
71 /* This function is called when a local caller sets an explicit sender address.
72 It checks whether this is permitted, which it is for trusted callers.
73 Otherwise, it must match the pattern(s) in untrusted_set_sender.
75 Arguments: the proposed sender address
76 Returns: TRUE for a trusted caller
77 TRUE if the address has been set, untrusted_set_sender has been
78 set, and the address matches something in the list
83 receive_check_set_sender(uschar
*newsender
)
86 if (trusted_caller
) return TRUE
;
87 if (newsender
== NULL
|| untrusted_set_sender
== NULL
) return FALSE
;
88 qnewsender
= (Ustrchr(newsender
, '@') != NULL
)?
89 newsender
: string_sprintf("%s@%s", newsender
, qualify_domain_sender
);
91 match_address_list(qnewsender
, TRUE
, TRUE
, CUSS
&untrusted_set_sender
, NULL
, -1,
98 /*************************************************
99 * Read space info for a partition *
100 *************************************************/
102 /* This function is called by receive_check_fs() below, and also by string
103 expansion for variables such as $spool_space. The field names for the statvfs
104 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
105 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
106 have inodes, and they return -1 for the number available.
108 Later: It turns out that some file systems that do not have the concept of
109 inodes return 0 rather than -1. Such systems should also return 0 for the total
110 number of inodes, so we require that to be greater than zero before returning
114 isspool TRUE for spool partition, FALSE for log partition
115 inodeptr address of int to receive inode count; -1 if there isn't one
117 Returns: available on-root space, in kilobytes
118 -1 for log partition if there isn't one
120 All values are -1 if the STATFS functions are not available.
124 receive_statvfs(BOOL isspool
, int *inodeptr
)
127 struct STATVFS statbuf
;
133 /* The spool directory must always exist. */
137 path
= spool_directory
;
141 /* Need to cut down the log file path to the directory, and to ignore any
142 appearance of "syslog" in it. */
146 int sep
= ':'; /* Not variable - outside scripts use */
147 const uschar
*p
= log_file_path
;
150 /* An empty log_file_path means "use the default". This is the same as an
151 empty item in a list. */
153 if (*p
== 0) p
= US
":";
154 while ((path
= string_nextinlist(&p
, &sep
, buffer
, sizeof(buffer
))))
155 if (Ustrcmp(path
, "syslog") != 0)
158 if (path
== NULL
) /* No log files */
164 /* An empty string means use the default, which is in the spool directory.
165 But don't just use the spool directory, as it is possible that the log
166 subdirectory has been symbolically linked elsewhere. */
170 sprintf(CS buffer
, CS
"%s/log", CS spool_directory
);
176 if ((cp
= Ustrrchr(path
, '/')) != NULL
) *cp
= 0;
180 /* We now have the path; do the business */
182 memset(&statbuf
, 0, sizeof(statbuf
));
184 if (STATVFS(CS path
, &statbuf
) != 0)
185 if (stat(CS path
, &dummy
) == -1 && errno
== ENOENT
)
186 { /* Can happen on first run after installation */
192 log_write(0, LOG_MAIN
|LOG_PANIC
, "cannot accept message: failed to stat "
193 "%s directory %s: %s", name
, path
, strerror(errno
));
194 smtp_closedown(US
"spool or log directory problem");
195 exim_exit(EXIT_FAILURE
);
198 *inodeptr
= (statbuf
.F_FILES
> 0)? statbuf
.F_FAVAIL
: -1;
200 /* Disks are getting huge. Take care with computing the size in kilobytes. */
202 return (int)(((double)statbuf
.F_BAVAIL
* (double)statbuf
.F_FRSIZE
)/1024.0);
205 /* Unable to find partition sizes in this environment. */
215 /*************************************************
216 * Check space on spool and log partitions *
217 *************************************************/
219 /* This function is called before accepting a message; if any thresholds are
220 set, it checks them. If a message_size is supplied, it checks that there is
221 enough space for that size plus the threshold - i.e. that the message won't
222 reduce the space to the threshold. Not all OS have statvfs(); for those that
223 don't, this function always returns TRUE. For some OS the old function and
224 struct name statfs is used; that is handled by a macro, defined in exim.h.
227 msg_size the (estimated) size of an incoming message
229 Returns: FALSE if there isn't enough space, or if the information cannot
231 TRUE if no check was done or there is enough space
235 receive_check_fs(int msg_size
)
239 if (check_spool_space
> 0 || msg_size
> 0 || check_spool_inodes
> 0)
241 space
= receive_statvfs(TRUE
, &inodes
);
244 debug_printf("spool directory space = %dK inodes = %d "
245 "check_space = %dK inodes = %d msg_size = %d\n",
246 space
, inodes
, check_spool_space
, check_spool_inodes
, msg_size
);
248 if ((space
>= 0 && space
< check_spool_space
) ||
249 (inodes
>= 0 && inodes
< check_spool_inodes
))
251 log_write(0, LOG_MAIN
, "spool directory space check failed: space=%d "
252 "inodes=%d", space
, inodes
);
257 if (check_log_space
> 0 || check_log_inodes
> 0)
259 space
= receive_statvfs(FALSE
, &inodes
);
262 debug_printf("log directory space = %dK inodes = %d "
263 "check_space = %dK inodes = %d\n",
264 space
, inodes
, check_log_space
, check_log_inodes
);
266 if ((space
>= 0 && space
< check_log_space
) ||
267 (inodes
>= 0 && inodes
< check_log_inodes
))
269 log_write(0, LOG_MAIN
, "log directory space check failed: space=%d "
270 "inodes=%d", space
, inodes
);
280 /*************************************************
281 * Bomb out while reading a message *
282 *************************************************/
284 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
285 received, or if there is a timeout. A rarer case might be if the log files are
286 screwed up and Exim can't open them to record a message's arrival. Handling
287 that case is done by setting a flag to cause the log functions to call this
288 function if there is an ultimate disaster. That is why it is globally
292 reason text reason to pass to the not-quit ACL
293 msg default SMTP response to give if in an SMTP session
298 receive_bomb_out(uschar
*reason
, uschar
*msg
)
300 static BOOL already_bombing_out
;
301 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
302 timeouts, if someone has something slow in their quit ACL. Since the only
303 things we should be doing are to close down cleanly ASAP, on the second
304 pass we also close down stuff that might be opened again, before bypassing
305 the ACL call and exiting. */
307 /* If spool_name is set, it contains the name of the data file that is being
308 written. Unlink it before closing so that it cannot be picked up by a delivery
309 process. Ensure that any header file is also removed. */
311 if (spool_name
[0] != '\0')
314 spool_name
[Ustrlen(spool_name
) - 1] = 'H';
316 spool_name
[0] = '\0';
319 /* Now close the file if it is open, either as a fd or a stream. */
321 if (data_file
!= NULL
)
323 (void)fclose(data_file
);
325 } else if (data_fd
>= 0) {
326 (void)close(data_fd
);
330 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
331 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
334 if (!already_bombing_out
)
336 already_bombing_out
= TRUE
;
339 if (smtp_batched_input
)
340 moan_smtp_batch(NULL
, "421 %s - message abandoned", msg
); /* No return */
341 smtp_notquit_exit(reason
, US
"421", US
"%s %s - closing connection.",
342 smtp_active_hostname
, msg
);
346 /* Exit from the program (non-BSMTP cases) */
348 exim_exit(EXIT_FAILURE
);
352 /*************************************************
353 * Data read timeout *
354 *************************************************/
356 /* Handler function for timeouts that occur while reading the data that
359 Argument: the signal number
364 data_timeout_handler(int sig
)
368 sig
= sig
; /* Keep picky compilers happy */
372 msg
= US
"SMTP incoming data timeout";
373 log_write(L_lost_incoming_connection
,
374 LOG_MAIN
, "SMTP data timeout (message abandoned) on connection "
376 (sender_fullhost
!= NULL
)? sender_fullhost
: US
"local process",
381 fprintf(stderr
, "exim: timed out while reading - message abandoned\n");
382 log_write(L_lost_incoming_connection
,
383 LOG_MAIN
, "timed out while reading local message");
386 receive_bomb_out(US
"data-timeout", msg
); /* Does not return */
391 /*************************************************
392 * local_scan() timeout *
393 *************************************************/
395 /* Handler function for timeouts that occur while running a local_scan()
398 Argument: the signal number
403 local_scan_timeout_handler(int sig
)
405 sig
= sig
; /* Keep picky compilers happy */
406 log_write(0, LOG_MAIN
|LOG_REJECT
, "local_scan() function timed out - "
407 "message temporarily rejected (size %d)", message_size
);
408 /* Does not return */
409 receive_bomb_out(US
"local-scan-timeout", US
"local verification problem");
414 /*************************************************
415 * local_scan() crashed *
416 *************************************************/
418 /* Handler function for signals that occur while running a local_scan()
421 Argument: the signal number
426 local_scan_crash_handler(int sig
)
428 log_write(0, LOG_MAIN
|LOG_REJECT
, "local_scan() function crashed with "
429 "signal %d - message temporarily rejected (size %d)", sig
, message_size
);
430 /* Does not return */
431 receive_bomb_out(US
"local-scan-error", US
"local verification problem");
435 /*************************************************
436 * SIGTERM or SIGINT received *
437 *************************************************/
439 /* Handler for SIGTERM or SIGINT signals that occur while reading the
440 data that comprises a message.
442 Argument: the signal number
447 data_sigterm_sigint_handler(int sig
)
453 msg
= US
"Service not available - SIGTERM or SIGINT received";
454 log_write(0, LOG_MAIN
, "%s closed after %s", smtp_get_connection_info(),
455 (sig
== SIGTERM
)? "SIGTERM" : "SIGINT");
459 if (filter_test
== FTEST_NONE
)
461 fprintf(stderr
, "\nexim: %s received - message abandoned\n",
462 (sig
== SIGTERM
)? "SIGTERM" : "SIGINT");
463 log_write(0, LOG_MAIN
, "%s received while reading local message",
464 (sig
== SIGTERM
)? "SIGTERM" : "SIGINT");
468 receive_bomb_out(US
"signal-exit", msg
); /* Does not return */
473 /*************************************************
474 * Add new recipient to list *
475 *************************************************/
477 /* This function builds a list of recipient addresses in argc/argv
481 recipient the next address to add to recipients_list
482 pno parent number for fixed aliases; -1 otherwise
488 receive_add_recipient(uschar
*recipient
, int pno
)
490 if (recipients_count
>= recipients_list_max
)
492 recipient_item
*oldlist
= recipients_list
;
493 int oldmax
= recipients_list_max
;
494 recipients_list_max
= recipients_list_max
? 2*recipients_list_max
: 50;
495 recipients_list
= store_get(recipients_list_max
* sizeof(recipient_item
));
497 memcpy(recipients_list
, oldlist
, oldmax
* sizeof(recipient_item
));
500 recipients_list
[recipients_count
].address
= recipient
;
501 recipients_list
[recipients_count
].pno
= pno
;
502 #ifdef EXPERIMENTAL_BRIGHTMAIL
503 recipients_list
[recipients_count
].bmi_optin
= bmi_current_optin
;
504 /* reset optin string pointer for next recipient */
505 bmi_current_optin
= NULL
;
507 recipients_list
[recipients_count
].orcpt
= NULL
;
508 recipients_list
[recipients_count
].dsn_flags
= 0;
509 recipients_list
[recipients_count
++].errors_to
= NULL
;
515 /*************************************************
516 * Send user response message *
517 *************************************************/
519 /* This function is passed a default response code and a user message. It calls
520 smtp_message_code() to check and possibly modify the response code, and then
521 calls smtp_respond() to transmit the response. I put this into a function
522 just to avoid a lot of repetition.
525 code the response code
526 user_msg the user message
533 smtp_user_msg(uschar
*code
, uschar
*user_msg
)
536 smtp_message_code(&code
, &len
, &user_msg
, NULL
, TRUE
);
537 smtp_respond(code
, len
, TRUE
, user_msg
);
545 /*************************************************
546 * Remove a recipient from the list *
547 *************************************************/
549 /* This function is provided for local_scan() to use.
552 recipient address to remove
554 Returns: TRUE if it did remove something; FALSE otherwise
558 receive_remove_recipient(uschar
*recipient
)
561 DEBUG(D_receive
) debug_printf("receive_remove_recipient(\"%s\") called\n",
563 for (count
= 0; count
< recipients_count
; count
++)
565 if (Ustrcmp(recipients_list
[count
].address
, recipient
) == 0)
567 if ((--recipients_count
- count
) > 0)
568 memmove(recipients_list
+ count
, recipients_list
+ count
+ 1,
569 (recipients_count
- count
)*sizeof(recipient_item
));
580 /*************************************************
581 * Read data portion of a non-SMTP message *
582 *************************************************/
584 /* This function is called to read the remainder of a message (following the
585 header) when the input is not from SMTP - we are receiving a local message on
586 a standard input stream. The message is always terminated by EOF, and is also
587 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
588 two cases for maximum efficiency.
590 Ensure that the body ends with a newline. This will naturally be the case when
591 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
592 as "sequences of lines" - this of course strictly applies only to SMTP, but
593 deliveries into BSD-type mailbox files also require it. Exim used to have a
594 flag for doing this at delivery time, but as it was always set for all
595 transports, I decided to simplify things by putting the check here instead.
597 There is at least one MUA (dtmail) that sends CRLF via this interface, and
598 other programs are known to do this as well. Exim used to have a option for
599 dealing with this: in July 2003, after much discussion, the code has been
600 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
602 However, for the case when a dot on a line by itself terminates a message, the
603 only recognized terminating sequences before and after the dot are LF and CRLF.
604 Otherwise, having read EOL . CR, you don't know whether to read another
607 Internally, in messages stored in Exim's spool files, LF is used as the line
608 terminator. Under the new regime, bare CRs will no longer appear in these
612 fout a FILE to which to write the message
614 Returns: One of the END_xxx values indicating why it stopped reading
618 read_message_data(FILE *fout
)
622 register int linelength
= 0;
624 /* Handle the case when only EOF terminates the message */
628 register int last_ch
= '\n';
630 for (; (ch
= (receive_getc
)(GETC_BUFFER_UNLIMITED
)) != EOF
; last_ch
= ch
)
632 if (ch
== 0) body_zerocount
++;
633 if (last_ch
== '\r' && ch
!= '\n')
635 if (linelength
> max_received_linelength
)
636 max_received_linelength
= linelength
;
638 if (fputc('\n', fout
) == EOF
) return END_WERROR
;
642 if (ch
== '\r') continue;
644 if (fputc(ch
, fout
) == EOF
) return END_WERROR
;
647 if (linelength
> max_received_linelength
)
648 max_received_linelength
= linelength
;
653 if (++message_size
> thismessage_size_limit
) return END_SIZE
;
658 if (linelength
> max_received_linelength
)
659 max_received_linelength
= linelength
;
660 if (fputc('\n', fout
) == EOF
) return END_WERROR
;
668 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
672 while ((ch
= (receive_getc
)(GETC_BUFFER_UNLIMITED
)) != EOF
)
674 if (ch
== 0) body_zerocount
++;
677 case 0: /* Normal state (previous char written) */
681 if (linelength
> max_received_linelength
)
682 max_received_linelength
= linelength
;
687 { ch_state
= 2; continue; }
690 case 1: /* After written "\n" */
691 if (ch
== '.') { ch_state
= 3; continue; }
692 if (ch
== '\r') { ch_state
= 2; continue; }
693 if (ch
== '\n') { body_linecount
++; linelength
= -1; }
698 body_linecount
++; /* After unwritten "\r" */
699 if (linelength
> max_received_linelength
)
700 max_received_linelength
= linelength
;
708 if (message_size
++, fputc('\n', fout
) == EOF
) return END_WERROR
;
709 if (ch
== '\r') continue;
715 case 3: /* After "\n." (\n written, dot not) */
716 if (ch
== '\n') return END_DOT
;
717 if (ch
== '\r') { ch_state
= 4; continue; }
720 if (fputc('.', fout
) == EOF
) return END_WERROR
;
724 case 4: /* After "\n.\r" (\n written, rest not) */
725 if (ch
== '\n') return END_DOT
;
728 if (fputs(".\n", fout
) == EOF
) return END_WERROR
;
729 if (ch
== '\r') { ch_state
= 2; continue; }
735 if (fputc(ch
, fout
) == EOF
) return END_WERROR
;
736 if (++message_size
> thismessage_size_limit
) return END_SIZE
;
739 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
740 the message ends with a newline, and we must also write any characters that
741 were saved up while testing for an ending dot. */
745 static uschar
*ends
[] = { US
"\n", NULL
, US
"\n", US
".\n", US
".\n" };
746 if (fputs(CS ends
[ch_state
], fout
) == EOF
) return END_WERROR
;
747 message_size
+= Ustrlen(ends
[ch_state
]);
757 /*************************************************
758 * Read data portion of an SMTP message *
759 *************************************************/
761 /* This function is called to read the remainder of an SMTP message (after the
762 headers), or to skip over it when an error has occurred. In this case, the
763 output file is passed as NULL.
765 If any line begins with a dot, that character is skipped. The input should only
766 be successfully terminated by CR LF . CR LF unless it is local (non-network)
767 SMTP, in which case the CRs are optional, but...
769 FUDGE: It seems that sites on the net send out messages with just LF
770 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
771 we make the CRs optional in all cases.
773 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
774 well, so that there are no CRs in spooled messages. However, the message
775 terminating dot is not recognized between two bare CRs.
778 fout a FILE to which to write the message; NULL if skipping
780 Returns: One of the END_xxx values indicating why it stopped reading
784 read_message_data_smtp(FILE *fout
)
790 while ((ch
= (receive_getc
)(GETC_BUFFER_UNLIMITED
)) != EOF
)
792 if (ch
== 0) body_zerocount
++;
795 case 0: /* After LF or CRLF */
799 continue; /* Don't ever write . after LF */
803 /* Else fall through to handle as normal uschar. */
805 case 1: /* Normal state */
810 if (linelength
> max_received_linelength
)
811 max_received_linelength
= linelength
;
821 case 2: /* After (unwritten) CR */
823 if (linelength
> max_received_linelength
)
824 max_received_linelength
= linelength
;
833 if (fout
!= NULL
&& fputc('\n', fout
) == EOF
) return END_WERROR
;
834 (void) cutthrough_put_nl();
835 if (ch
!= '\r') ch_state
= 1; else continue;
839 case 3: /* After [CR] LF . */
847 /* The dot was removed at state 3. For a doubled dot, here, reinstate
848 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
849 and to file below. */
853 (void) cutthrough_puts(&c
, 1);
858 case 4: /* After [CR] LF . CR */
859 if (ch
== '\n') return END_DOT
;
862 if (fout
!= NULL
&& fputc('\n', fout
) == EOF
) return END_WERROR
;
863 (void) cutthrough_put_nl();
873 /* Add the character to the spool file, unless skipping; then loop for the
880 if (fputc(ch
, fout
) == EOF
) return END_WERROR
;
881 if (message_size
> thismessage_size_limit
) return END_SIZE
;
884 (void) cutthrough_put_nl();
888 (void) cutthrough_puts(&c
, 1);
892 /* Fall through here if EOF encountered. This indicates some kind of error,
893 since a correct message is terminated by [CR] LF . [CR] LF. */
901 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
902 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
903 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
904 body_linecount accounting for proper re-expansion for the wire, so use
905 a cut-down version of the state-machine above; we don't need to do leading-dot
906 detection and unstuffing.
909 fout a FILE to which to write the message; NULL if skipping
911 Returns: One of the END_xxx values indicating why it stopped reading
915 read_message_bdat_smtp(FILE *fout
)
917 int linelength
= 0, ch
;
918 enum CH_STATE ch_state
= LF_SEEN
;
922 switch ((ch
= (bdat_getc
)(GETC_BUFFER_UNLIMITED
)))
924 case EOF
: return END_EOF
;
925 case EOD
: return END_DOT
; /* normal exit */
926 case ERR
: return END_PROTOCOL
;
927 case '\0': body_zerocount
++; break;
931 case LF_SEEN
: /* After LF or CRLF */
933 /* fall through to handle as normal uschar. */
935 case MID_LINE
: /* Mid-line state */
940 if (linelength
> max_received_linelength
)
941 max_received_linelength
= linelength
;
947 continue; /* don't write CR */
951 case CR_SEEN
: /* After (unwritten) CR */
953 if (linelength
> max_received_linelength
)
954 max_received_linelength
= linelength
;
961 if (fout
!= NULL
&& fputc('\n', fout
) == EOF
) return END_WERROR
;
962 (void) cutthrough_put_nl();
963 if (ch
== '\r') continue; /* don't write CR */
969 /* Add the character to the spool file, unless skipping */
975 if (fputc(ch
, fout
) == EOF
) return END_WERROR
;
976 if (message_size
> thismessage_size_limit
) return END_SIZE
;
979 (void) cutthrough_put_nl();
983 (void) cutthrough_puts(&c
, 1);
992 /*************************************************
993 * Swallow SMTP message *
994 *************************************************/
996 /* This function is called when there has been some kind of error while reading
997 an SMTP message, and the remaining data may need to be swallowed. It is global
998 because it is called from smtp_closedown() to shut down an incoming call
1001 Argument: a FILE from which to read the message
1006 receive_swallow_smtp(void)
1008 /*XXX CHUNKING: not enough. read chunks until RSET? */
1009 if (message_ended
>= END_NOTENDED
)
1010 message_ended
= read_message_data_smtp(NULL
);
1015 /*************************************************
1016 * Handle lost SMTP connection *
1017 *************************************************/
1019 /* This function logs connection loss incidents and generates an appropriate
1022 Argument: additional data for the message
1023 Returns: the SMTP response
1027 handle_lost_connection(uschar
*s
)
1029 log_write(L_lost_incoming_connection
| L_smtp_connection
, LOG_MAIN
,
1030 "%s lost while reading message data%s", smtp_get_connection_info(), s
);
1031 smtp_notquit_exit(US
"connection-lost", NULL
, NULL
);
1032 return US
"421 Lost incoming connection";
1038 /*************************************************
1039 * Handle a non-smtp reception error *
1040 *************************************************/
1042 /* This function is called for various errors during the reception of non-SMTP
1043 messages. It either sends a message to the sender of the problem message, or it
1044 writes to the standard error stream.
1047 errcode code for moan_to_sender(), identifying the error
1048 text1 first message text, passed to moan_to_sender()
1049 text2 second message text, used only for stderrr
1050 error_rc code to pass to exim_exit if no problem
1051 f FILE containing body of message (may be stdin)
1052 hptr pointer to instore headers or NULL
1054 Returns: calls exim_exit(), which does not return
1058 give_local_error(int errcode
, uschar
*text1
, uschar
*text2
, int error_rc
,
1059 FILE *f
, header_line
*hptr
)
1061 if (error_handling
== ERRORS_SENDER
)
1065 eblock
.text1
= text1
;
1066 eblock
.text2
= US
"";
1067 if (!moan_to_sender(errcode
, &eblock
, hptr
, f
, FALSE
))
1068 error_rc
= EXIT_FAILURE
;
1071 fprintf(stderr
, "exim: %s%s\n", text2
, text1
); /* Sic */
1073 exim_exit(error_rc
);
1078 /*************************************************
1079 * Add header lines set up by ACL *
1080 *************************************************/
1082 /* This function is called to add the header lines that were set up by
1083 statements in an ACL to the list of headers in memory. It is done in two stages
1084 like this, because when the ACL for RCPT is running, the other headers have not
1085 yet been received. This function is called twice; once just before running the
1086 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1087 are visible to the DATA ACL.
1089 Originally these header lines were added at the end. Now there is support for
1090 three different places: top, bottom, and after the Received: header(s). There
1091 will always be at least one Received: header, even if it is marked deleted, and
1092 even if something else has been put in front of it.
1095 acl_name text to identify which ACL
1101 add_acl_headers(int where
, uschar
*acl_name
)
1103 header_line
*h
, *next
;
1104 header_line
*last_received
= NULL
;
1108 case ACL_WHERE_DKIM
:
1109 case ACL_WHERE_MIME
:
1110 case ACL_WHERE_DATA
:
1111 if (cutthrough
.fd
>= 0 && (acl_removed_headers
|| acl_added_headers
))
1113 log_write(0, LOG_MAIN
|LOG_PANIC
, "Header modification in data ACLs"
1114 " will not take effect on cutthrough deliveries");
1119 if (acl_removed_headers
!= NULL
)
1121 DEBUG(D_receive
|D_acl
) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name
);
1123 for (h
= header_list
; h
!= NULL
; h
= h
->next
) if (h
->type
!= htype_old
)
1125 const uschar
* list
= acl_removed_headers
;
1126 int sep
= ':'; /* This is specified as a colon-separated list */
1130 while ((s
= string_nextinlist(&list
, &sep
, buffer
, sizeof(buffer
))))
1131 if (header_testname(h
, s
, Ustrlen(s
), FALSE
))
1133 h
->type
= htype_old
;
1134 DEBUG(D_receive
|D_acl
) debug_printf_indent(" %s", h
->text
);
1137 acl_removed_headers
= NULL
;
1138 DEBUG(D_receive
|D_acl
) debug_printf_indent(">>\n");
1141 if (acl_added_headers
== NULL
) return;
1142 DEBUG(D_receive
|D_acl
) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name
);
1144 for (h
= acl_added_headers
; h
!= NULL
; h
= next
)
1151 h
->next
= header_list
;
1153 DEBUG(D_receive
|D_acl
) debug_printf_indent(" (at top)");
1157 if (last_received
== NULL
)
1159 last_received
= header_list
;
1160 while (!header_testname(last_received
, US
"Received", 8, FALSE
))
1161 last_received
= last_received
->next
;
1162 while (last_received
->next
!= NULL
&&
1163 header_testname(last_received
->next
, US
"Received", 8, FALSE
))
1164 last_received
= last_received
->next
;
1166 h
->next
= last_received
->next
;
1167 last_received
->next
= h
;
1168 DEBUG(D_receive
|D_acl
) debug_printf_indent(" (after Received:)");
1172 /* add header before any header which is NOT Received: or Resent- */
1173 last_received
= header_list
;
1174 while ( (last_received
->next
!= NULL
) &&
1175 ( (header_testname(last_received
->next
, US
"Received", 8, FALSE
)) ||
1176 (header_testname_incomplete(last_received
->next
, US
"Resent-", 7, FALSE
)) ) )
1177 last_received
= last_received
->next
;
1178 /* last_received now points to the last Received: or Resent-* header
1179 in an uninterrupted chain of those header types (seen from the beginning
1180 of all headers. Our current header must follow it. */
1181 h
->next
= last_received
->next
;
1182 last_received
->next
= h
;
1183 DEBUG(D_receive
|D_acl
) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1188 header_last
->next
= h
;
1192 if (h
->next
== NULL
) header_last
= h
;
1194 /* Check for one of the known header types (From:, To:, etc.) though in
1195 practice most added headers are going to be "other". Lower case
1196 identification letters are never stored with the header; they are used
1197 for existence tests when messages are received. So discard any lower case
1200 h
->type
= header_checkname(h
, FALSE
);
1201 if (h
->type
>= 'a') h
->type
= htype_other
;
1203 DEBUG(D_receive
|D_acl
) debug_printf_indent(" %s", header_last
->text
);
1206 acl_added_headers
= NULL
;
1207 DEBUG(D_receive
|D_acl
) debug_printf_indent(">>\n");
1212 /*************************************************
1213 * Add host information for log line *
1214 *************************************************/
1216 /* Called for acceptance and rejecting log lines. This adds information about
1217 the calling host to a string that is being built dynamically.
1220 s the dynamic string
1221 sizeptr points to the size variable
1222 ptrptr points to the pointer variable
1224 Returns: the extended string
1228 add_host_info_for_log(uschar
* s
, int * sizeptr
, int * ptrptr
)
1230 if (sender_fullhost
)
1232 if (LOGGING(dnssec
) && sender_host_dnssec
) /*XXX sender_helo_dnssec? */
1233 s
= string_cat(s
, sizeptr
, ptrptr
, US
" DS");
1234 s
= string_append(s
, sizeptr
, ptrptr
, 2, US
" H=", sender_fullhost
);
1235 if (LOGGING(incoming_interface
) && interface_address
!= NULL
)
1237 s
= string_cat(s
, sizeptr
, ptrptr
,
1238 string_sprintf(" I=[%s]:%d", interface_address
, interface_port
));
1241 if (sender_ident
!= NULL
)
1242 s
= string_append(s
, sizeptr
, ptrptr
, 2, US
" U=", sender_ident
);
1243 if (received_protocol
!= NULL
)
1244 s
= string_append(s
, sizeptr
, ptrptr
, 2, US
" P=", received_protocol
);
1250 #ifdef WITH_CONTENT_SCAN
1252 /*************************************************
1253 * Run the MIME ACL on a message *
1254 *************************************************/
1256 /* This code is in a subroutine so that it can be used for both SMTP
1257 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1260 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1261 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1262 smtp_reply_ptr Where SMTP reply is being built
1263 blackholed_by_ptr Where "blackholed by" message is being built
1265 Returns: TRUE to carry on; FALSE to abandon the message
1269 run_mime_acl(uschar
*acl
, BOOL
*smtp_yield_ptr
, uschar
**smtp_reply_ptr
,
1270 uschar
**blackholed_by_ptr
)
1273 uschar rfc822_file_path
[2048];
1274 unsigned long mbox_size
;
1275 header_line
*my_headerlist
;
1276 uschar
*user_msg
, *log_msg
;
1277 int mime_part_count_buffer
= -1;
1280 memset(CS rfc822_file_path
,0,2048);
1282 /* check if it is a MIME message */
1283 my_headerlist
= header_list
;
1284 while (my_headerlist
!= NULL
)
1286 /* skip deleted headers */
1287 if (my_headerlist
->type
== '*')
1289 my_headerlist
= my_headerlist
->next
;
1292 if (strncmpic(my_headerlist
->text
, US
"Content-Type:", 13) == 0)
1294 DEBUG(D_receive
) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1297 my_headerlist
= my_headerlist
->next
;
1300 DEBUG(D_receive
) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1304 /* make sure the eml mbox file is spooled up */
1305 mbox_file
= spool_mbox(&mbox_size
, NULL
);
1306 if (mbox_file
== NULL
) {
1307 /* error while spooling */
1308 log_write(0, LOG_MAIN
|LOG_PANIC
,
1309 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1310 Uunlink(spool_name
);
1312 #ifdef EXPERIMENTAL_DCC
1315 smtp_respond(US
"451", 3, TRUE
, US
"temporary local problem");
1316 message_id
[0] = 0; /* Indicate no message accepted */
1317 *smtp_reply_ptr
= US
""; /* Indicate reply already sent */
1318 return FALSE
; /* Indicate skip to end of receive function */
1324 mime_part_count
= -1;
1325 rc
= mime_acl_check(acl
, mbox_file
, NULL
, &user_msg
, &log_msg
);
1326 (void)fclose(mbox_file
);
1328 if (Ustrlen(rfc822_file_path
) > 0)
1330 mime_part_count
= mime_part_count_buffer
;
1332 if (unlink(CS rfc822_file_path
) == -1)
1334 log_write(0, LOG_PANIC
,
1335 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1340 /* check if we must check any message/rfc822 attachments */
1343 uschar temp_path
[1024];
1344 struct dirent
* entry
;
1347 (void) string_format(temp_path
, sizeof(temp_path
), "%s/scan/%s",
1348 spool_directory
, message_id
);
1350 tempdir
= opendir(CS temp_path
);
1353 if (!(entry
= readdir(tempdir
)))
1355 if (strncmpic(US entry
->d_name
, US
"__rfc822_", 9) == 0)
1357 (void) string_format(rfc822_file_path
, sizeof(rfc822_file_path
),
1358 "%s/scan/%s/%s", spool_directory
, message_id
, entry
->d_name
);
1359 DEBUG(D_receive
) debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1368 if ((mbox_file
= Ufopen(rfc822_file_path
, "rb")))
1370 /* set RFC822 expansion variable */
1372 mime_part_count_buffer
= mime_part_count
;
1373 goto MIME_ACL_CHECK
;
1375 log_write(0, LOG_PANIC
,
1376 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1377 unlink(CS rfc822_file_path
);
1382 add_acl_headers(ACL_WHERE_MIME
, US
"MIME");
1385 recipients_count
= 0;
1386 *blackholed_by_ptr
= US
"MIME ACL";
1390 Uunlink(spool_name
);
1392 #ifdef EXPERIMENTAL_DCC
1396 && smtp_handle_acl_fail(ACL_WHERE_MIME
, rc
, user_msg
, log_msg
) != 0)
1398 *smtp_yield_ptr
= FALSE
; /* No more messages after dropped connection */
1399 *smtp_reply_ptr
= US
""; /* Indicate reply already sent */
1401 message_id
[0] = 0; /* Indicate no message accepted */
1402 return FALSE
; /* Cause skip to end of receive function */
1408 #endif /* WITH_CONTENT_SCAN */
1413 received_header_gen(void)
1417 header_line
*received_header
= header_list
;
1419 timestamp
= expand_string(US
"${tod_full}");
1420 if (recipients_count
== 1) received_for
= recipients_list
[0].address
;
1421 received
= expand_string(received_header_text
);
1422 received_for
= NULL
;
1426 if(spool_name
[0] != 0)
1427 Uunlink(spool_name
); /* Lose the data file */
1428 log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "Expansion of \"%s\" "
1429 "(received_header_text) failed: %s", string_printing(received_header_text
),
1430 expand_string_message
);
1433 /* The first element on the header chain is reserved for the Received header,
1434 so all we have to do is fill in the text pointer, and set the type. However, if
1435 the result of the expansion is an empty string, we leave the header marked as
1436 "old" so as to refrain from adding a Received header. */
1438 if (received
[0] == 0)
1440 received_header
->text
= string_sprintf("Received: ; %s\n", timestamp
);
1441 received_header
->type
= htype_old
;
1445 received_header
->text
= string_sprintf("%s; %s\n", received
, timestamp
);
1446 received_header
->type
= htype_received
;
1449 received_header
->slen
= Ustrlen(received_header
->text
);
1451 DEBUG(D_receive
) debug_printf(">>Generated Received: header line\n%c %s",
1452 received_header
->type
, received_header
->text
);
1457 /*************************************************
1459 *************************************************/
1461 /* Receive a message on the given input, and put it into a pair of spool files.
1462 Either a non-null list of recipients, or the extract flag will be true, or
1463 both. The flag sender_local is true for locally generated messages. The flag
1464 submission_mode is true if an ACL has obeyed "control = submission". The flag
1465 suppress_local_fixups is true if an ACL has obeyed "control =
1466 suppress_local_fixups" or -G was passed on the command-line.
1467 The flag smtp_input is true if the message is to be
1468 handled using SMTP conventions about termination and lines starting with dots.
1469 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1471 If a message was successfully read, message_id[0] will be non-zero.
1473 The general actions of this function are:
1475 . Read the headers of the message (if any) into a chain of store
1478 . If there is a "sender:" header and the message is locally originated,
1479 throw it away, unless the caller is trusted, or unless
1480 active_local_sender_retain is set - which can only happen if
1481 active_local_from_check is false.
1483 . If recipients are to be extracted from the message, build the
1484 recipients list from the headers, removing any that were on the
1485 original recipients list (unless extract_addresses_remove_arguments is
1486 false), and at the same time, remove any bcc header that may be present.
1488 . Get the spool file for the data, sort out its unique name, open
1489 and lock it (but don't give it the name yet).
1491 . Generate a "Message-Id" header if the message doesn't have one, for
1492 locally-originated messages.
1494 . Generate a "Received" header.
1496 . Ensure the recipients list is fully qualified and rewritten if necessary.
1498 . If there are any rewriting rules, apply them to the sender address
1499 and also to the headers.
1501 . If there is no from: header, generate one, for locally-generated messages
1502 and messages in "submission mode" only.
1504 . If the sender is local, check that from: is correct, and if not, generate
1505 a Sender: header, unless message comes from a trusted caller, or this
1506 feature is disabled by active_local_from_check being false.
1508 . If there is no "date" header, generate one, for locally-originated
1509 or submission mode messages only.
1511 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1512 dot_ends mode, to the data file. Leave it open, to hold the lock.
1514 . Write the envelope and the headers to a new file.
1516 . Set the name for the header file; close it.
1518 . Set the name for the data file; close it.
1520 Because this function can potentially be called many times in a single
1521 SMTP connection, all store should be got by store_get(), so that it will be
1522 automatically retrieved after the message is accepted.
1524 FUDGE: It seems that sites on the net send out messages with just LF
1525 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1526 we make the CRs optional in all cases.
1528 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1529 new regime is now in place in which bare CRs in header lines are turned into LF
1530 followed by a space, so as not to terminate the header line.
1532 February 2004: A bare LF in a header line in a message whose first line was
1533 terminated by CRLF is treated in the same way as a bare CR.
1536 extract_recip TRUE if recipients are to be extracted from the message's
1539 Returns: TRUE there are more messages to be read (SMTP input)
1540 FALSE there are no more messages to be read (non-SMTP input
1541 or SMTP connection collapsed, or other failure)
1543 When reading a message for filter testing, the returned value indicates
1544 whether the headers (which is all that is read) were terminated by '.' or
1548 receive_msg(BOOL extract_recip
)
1553 int process_info_len
= Ustrlen(process_info
);
1554 int error_rc
= (error_handling
== ERRORS_SENDER
)?
1555 errors_sender_rc
: EXIT_FAILURE
;
1556 int header_size
= 256;
1557 int start
, end
, domain
, size
, sptr
;
1560 int prevlines_length
= 0;
1562 register int ptr
= 0;
1564 BOOL contains_resent_headers
= FALSE
;
1565 BOOL extracted_ignored
= FALSE
;
1566 BOOL first_line_ended_crlf
= TRUE_UNSET
;
1567 BOOL smtp_yield
= TRUE
;
1570 BOOL resents_exist
= FALSE
;
1571 uschar
*resent_prefix
= US
"";
1572 uschar
*blackholed_by
= NULL
;
1573 uschar
*blackhole_log_msg
= US
"";
1574 enum {NOT_TRIED
, TMP_REJ
, PERM_REJ
, ACCEPTED
} cutthrough_done
= NOT_TRIED
;
1577 error_block
*bad_addresses
= NULL
;
1579 uschar
*frozen_by
= NULL
;
1580 uschar
*queued_by
= NULL
;
1583 struct stat statbuf
;
1585 /* Final message to give to SMTP caller, and messages from ACLs */
1587 uschar
*smtp_reply
= NULL
;
1588 uschar
*user_msg
, *log_msg
;
1590 /* Working header pointers */
1592 header_line
*h
, *next
;
1594 /* Flags for noting the existence of certain headers (only one left) */
1596 BOOL date_header_exists
= FALSE
;
1598 /* Pointers to receive the addresses of headers whose contents we need. */
1600 header_line
*from_header
= NULL
;
1601 header_line
*subject_header
= NULL
;
1602 header_line
*msgid_header
= NULL
;
1603 header_line
*received_header
;
1605 #ifdef EXPERIMENTAL_DMARC
1607 #endif /* EXPERIMENTAL_DMARC */
1609 /* Variables for use when building the Received: header. */
1614 /* Release any open files that might have been cached while preparing to
1615 accept the message - e.g. by verifying addresses - because reading a message
1616 might take a fair bit of real time. */
1620 /* Extracting the recipient list from an input file is incompatible with
1621 cutthrough delivery with the no-spool option. It shouldn't be possible
1622 to set up the combination, but just in case kill any ongoing connection. */
1623 if (extract_recip
|| !smtp_input
)
1624 cancel_cutthrough_connection("not smtp input");
1626 /* Initialize the chain of headers by setting up a place-holder for Received:
1627 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1628 pointing to the end of the chain to make adding headers simple. */
1630 received_header
= header_list
= header_last
= store_get(sizeof(header_line
));
1631 header_list
->next
= NULL
;
1632 header_list
->type
= htype_old
;
1633 header_list
->text
= NULL
;
1634 header_list
->slen
= 0;
1636 /* Control block for the next header to be read. */
1638 next
= store_get(sizeof(header_line
));
1639 next
->text
= store_get(header_size
);
1641 /* Initialize message id to be null (indicating no message read), and the
1642 header names list to be the normal list. Indicate there is no data file open
1643 yet, initialize the size and warning count, and deal with no size limit. */
1651 received_count
= 1; /* For the one we will add */
1653 if (thismessage_size_limit
<= 0) thismessage_size_limit
= INT_MAX
;
1655 /* While reading the message, the following counts are computed. */
1657 message_linecount
= body_linecount
= body_zerocount
=
1658 max_received_linelength
= 0;
1660 #ifndef DISABLE_DKIM
1661 /* Call into DKIM to set up the context. In CHUNKING mode
1662 we clear the dot-stuffing flag */
1663 if (smtp_input
&& !smtp_batched_input
&& !dkim_disable_verify
)
1664 dkim_exim_verify_init(chunking_state
<= CHUNKING_OFFERED
);
1667 #ifdef EXPERIMENTAL_DMARC
1668 /* initialize libopendmarc */
1669 dmarc_up
= dmarc_init();
1672 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1673 ids, and fractions of a second are required. See the comments that precede the
1674 message id creation below. */
1676 (void)gettimeofday(&message_id_tv
, NULL
);
1678 /* For other uses of the received time we can operate with granularity of one
1679 second, and for that we use the global variable received_time. This is for
1680 things like ultimate message timeouts. */
1682 received_time
= message_id_tv
.tv_sec
;
1684 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1685 happen in the smtp_getc() function when it refills its buffer. */
1687 if (smtp_input
) os_non_restarting_signal(SIGALRM
, data_timeout_handler
);
1689 /* If not SMTP input, timeout happens only if configured, and we just set a
1690 single timeout for the whole message. */
1692 else if (receive_timeout
> 0)
1694 os_non_restarting_signal(SIGALRM
, data_timeout_handler
);
1695 alarm(receive_timeout
);
1698 /* SIGTERM and SIGINT are caught always. */
1700 signal(SIGTERM
, data_sigterm_sigint_handler
);
1701 signal(SIGINT
, data_sigterm_sigint_handler
);
1703 /* Header lines in messages are not supposed to be very long, though when
1704 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1705 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1706 storing the header, and extend this as necessary using string_cat().
1708 To cope with total lunacies, impose an upper limit on the length of the header
1709 section of the message, as otherwise the store will fill up. We must also cope
1710 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1711 Folded header lines are joined into one string, leaving the '\n' characters
1712 inside them, so that writing them out reproduces the input.
1714 Loop for each character of each header; the next structure for chaining the
1715 header is set up already, with ptr the offset of the next character in
1720 int ch
= (receive_getc
)(GETC_BUFFER_UNLIMITED
);
1722 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1723 SMTP must have a correct "." terminator. */
1725 if (ch
== EOF
&& smtp_input
/* && !smtp_batched_input */)
1727 smtp_reply
= handle_lost_connection(US
" (header)");
1729 goto TIDYUP
; /* Skip to end of function */
1732 /* See if we are at the current header's size limit - there must be at least
1733 four bytes left. This allows for the new character plus a zero, plus two for
1734 extra insertions when we are playing games with dots and carriage returns. If
1735 we are at the limit, extend the text buffer. This could have been done
1736 automatically using string_cat() but because this is a tightish loop storing
1737 only one character at a time, we choose to do it inline. Normally
1738 store_extend() will be able to extend the block; only at the end of a big
1739 store block will a copy be needed. To handle the case of very long headers
1740 (and sometimes lunatic messages can have ones that are 100s of K long) we
1741 call store_release() for strings that have been copied - if the string is at
1742 the start of a block (and therefore the only thing in it, because we aren't
1743 doing any other gets), the block gets freed. We can only do this because we
1744 know there are no other calls to store_get() going on. */
1746 if (ptr
>= header_size
- 4)
1748 int oldsize
= header_size
;
1749 /* header_size += 256; */
1751 if (!store_extend(next
->text
, oldsize
, header_size
))
1753 uschar
*newtext
= store_get(header_size
);
1754 memcpy(newtext
, next
->text
, ptr
);
1755 store_release(next
->text
);
1756 next
->text
= newtext
;
1760 /* Cope with receiving a binary zero. There is dispute about whether
1761 these should be allowed in RFC 822 messages. The middle view is that they
1762 should not be allowed in headers, at least. Exim takes this attitude at
1763 the moment. We can't just stomp on them here, because we don't know that
1764 this line is a header yet. Set a flag to cause scanning later. */
1766 if (ch
== 0) had_zero
++;
1768 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1769 those from data files use just LF. Treat LF in local SMTP input as a
1770 terminator too. Treat EOF as a line terminator always. */
1772 if (ch
== EOF
) goto EOL
;
1774 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1775 other MTAs accept this. We are therefore forced into this "liberalisation"
1776 too, so we accept LF as a line terminator whatever the source of the message.
1777 However, if the first line of the message ended with a CRLF, we treat a bare
1778 LF specially by inserting a white space after it to ensure that the header
1779 line is not terminated. */
1783 if (first_line_ended_crlf
== TRUE_UNSET
) first_line_ended_crlf
= FALSE
;
1784 else if (first_line_ended_crlf
) receive_ungetc(' ');
1788 /* This is not the end of the line. If this is SMTP input and this is
1789 the first character in the line and it is a "." character, ignore it.
1790 This implements the dot-doubling rule, though header lines starting with
1791 dots aren't exactly common. They are legal in RFC 822, though. If the
1792 following is CRLF or LF, this is the line that that terminates the
1793 entire message. We set message_ended to indicate this has happened (to
1794 prevent further reading), and break out of the loop, having freed the
1795 empty header, and set next = NULL to indicate no data line. */
1797 if (ptr
== 0 && ch
== '.' && (smtp_input
|| dot_ends
))
1799 ch
= (receive_getc
)(GETC_BUFFER_UNLIMITED
);
1802 ch
= (receive_getc
)(GETC_BUFFER_UNLIMITED
);
1806 ch
= '\r'; /* Revert to CR */
1811 message_ended
= END_DOT
;
1814 break; /* End character-reading loop */
1817 /* For non-SMTP input, the dot at the start of the line was really a data
1818 character. What is now in ch is the following character. We guaranteed
1819 enough space for this above. */
1823 next
->text
[ptr
++] = '.';
1828 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1829 remember this case if this is the first line ending. */
1833 ch
= (receive_getc
)(GETC_BUFFER_UNLIMITED
);
1836 if (first_line_ended_crlf
== TRUE_UNSET
) first_line_ended_crlf
= TRUE
;
1840 /* Otherwise, put back the character after CR, and turn the bare CR
1843 ch
= (receive_ungetc
)(ch
);
1844 next
->text
[ptr
++] = '\n';
1849 /* We have a data character for the header line. */
1851 next
->text
[ptr
++] = ch
; /* Add to buffer */
1852 message_size
++; /* Total message size so far */
1854 /* Handle failure due to a humungously long header section. The >= allows
1855 for the terminating \n. Add what we have so far onto the headers list so
1856 that it gets reflected in any error message, and back up the just-read
1859 if (message_size
>= header_maxsize
)
1861 next
->text
[ptr
] = 0;
1863 next
->type
= htype_other
;
1865 header_last
->next
= next
;
1868 log_write(0, LOG_MAIN
, "ridiculously long message header received from "
1869 "%s (more than %d characters): message abandoned",
1870 sender_host_unknown
? sender_ident
: sender_fullhost
, header_maxsize
);
1874 smtp_reply
= US
"552 Message header is ridiculously long";
1875 receive_swallow_smtp();
1876 goto TIDYUP
; /* Skip to end of function */
1881 give_local_error(ERRMESS_VLONGHEADER
,
1882 string_sprintf("message header longer than %d characters received: "
1883 "message not accepted", header_maxsize
), US
"", error_rc
, stdin
,
1885 /* Does not return */
1889 continue; /* With next input character */
1891 /* End of header line reached */
1895 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1897 receive_linecount
++;
1898 message_linecount
++;
1900 /* Keep track of maximum line length */
1902 if (ptr
- prevlines_length
> max_received_linelength
)
1903 max_received_linelength
= ptr
- prevlines_length
;
1904 prevlines_length
= ptr
+ 1;
1906 /* Now put in the terminating newline. There is always space for
1907 at least two more characters. */
1909 next
->text
[ptr
++] = '\n';
1912 /* A blank line signals the end of the headers; release the unwanted
1913 space and set next to NULL to indicate this. */
1922 /* There is data in the line; see if the next input character is a
1923 whitespace character. If it is, we have a continuation of this header line.
1924 There is always space for at least one character at this point. */
1928 int nextch
= (receive_getc
)(GETC_BUFFER_UNLIMITED
);
1929 if (nextch
== ' ' || nextch
== '\t')
1931 next
->text
[ptr
++] = nextch
;
1933 continue; /* Iterate the loop */
1935 else if (nextch
!= EOF
) (receive_ungetc
)(nextch
); /* For next time */
1936 else ch
= EOF
; /* Cause main loop to exit at end */
1939 /* We have got to the real line end. Terminate the string and release store
1940 beyond it. If it turns out to be a real header, internal binary zeros will
1941 be squashed later. */
1943 next
->text
[ptr
] = 0;
1945 store_reset(next
->text
+ ptr
+ 1);
1947 /* Check the running total size against the overall message size limit. We
1948 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1949 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1950 headers - the code to read the body will then also hit the buffer. */
1952 if (message_size
> thismessage_size_limit
) break;
1954 /* A line that is not syntactically correct for a header also marks
1955 the end of the headers. In this case, we leave next containing the
1956 first data line. This might actually be several lines because of the
1957 continuation logic applied above, but that doesn't matter.
1959 It turns out that smail, and presumably sendmail, accept leading lines
1962 From ph10 Fri Jan 5 12:35 GMT 1996
1964 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1965 find any documentation of this, but for compatibility it had better be
1966 accepted. Exim restricts it to the case of non-smtp messages, and
1967 treats it as an alternative to the -f command line option. Thus it is
1968 ignored except for trusted users or filter testing. Otherwise it is taken
1969 as the sender address, unless -f was used (sendmail compatibility).
1971 It further turns out that some UUCPs generate the From_line in a different
1974 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1976 The regex for matching these things is now capable of recognizing both
1977 formats (including 2- and 4-digit years in the latter). In fact, the regex
1978 is now configurable, as is the expansion string to fish out the sender.
1980 Even further on it has been discovered that some broken clients send
1981 these lines in SMTP messages. There is now an option to ignore them from
1982 specified hosts or networks. Sigh. */
1984 if (header_last
== header_list
&&
1987 (sender_host_address
!= NULL
&&
1988 verify_check_host(&ignore_fromline_hosts
) == OK
)
1990 (sender_host_address
== NULL
&& ignore_fromline_local
)
1992 regex_match_and_setup(regex_From
, next
->text
, 0, -1))
1994 if (!sender_address_forced
)
1996 uschar
*uucp_sender
= expand_string(uucp_from_sender
);
1997 if (uucp_sender
== NULL
)
1999 log_write(0, LOG_MAIN
|LOG_PANIC
,
2000 "expansion of \"%s\" failed after matching "
2001 "\"From \" line: %s", uucp_from_sender
, expand_string_message
);
2005 int start
, end
, domain
;
2007 uschar
*newsender
= parse_extract_address(uucp_sender
, &errmess
,
2008 &start
, &end
, &domain
, TRUE
);
2009 if (newsender
!= NULL
)
2011 if (domain
== 0 && newsender
[0] != 0)
2012 newsender
= rewrite_address_qualify(newsender
, FALSE
);
2014 if (filter_test
!= FTEST_NONE
|| receive_check_set_sender(newsender
))
2016 sender_address
= newsender
;
2018 if (trusted_caller
|| filter_test
!= FTEST_NONE
)
2020 authenticated_sender
= NULL
;
2021 originator_name
= US
"";
2022 sender_local
= FALSE
;
2025 if (filter_test
!= FTEST_NONE
)
2026 printf("Sender taken from \"From \" line\n");
2033 /* Not a leading "From " line. Check to see if it is a valid header line.
2034 Header names may contain any non-control characters except space and colon,
2039 uschar
*p
= next
->text
;
2041 /* If not a valid header line, break from the header reading loop, leaving
2042 next != NULL, indicating that it holds the first line of the body. */
2044 if (isspace(*p
)) break;
2045 while (mac_isgraph(*p
) && *p
!= ':') p
++;
2046 while (isspace(*p
)) p
++;
2049 body_zerocount
= had_zero
;
2053 /* We have a valid header line. If there were any binary zeroes in
2054 the line, stomp on them here. */
2057 for (p
= next
->text
; p
< next
->text
+ ptr
; p
++) if (*p
== 0) *p
= '?';
2059 /* It is perfectly legal to have an empty continuation line
2060 at the end of a header, but it is confusing to humans
2061 looking at such messages, since it looks like a blank line.
2062 Reduce confusion by removing redundant white space at the
2063 end. We know that there is at least one printing character
2064 (the ':' tested for above) so there is no danger of running
2067 p
= next
->text
+ ptr
- 2;
2070 while (*p
== ' ' || *p
== '\t') p
--;
2071 if (*p
!= '\n') break;
2072 ptr
= (p
--) - next
->text
+ 1;
2073 message_size
-= next
->slen
- ptr
;
2074 next
->text
[ptr
] = 0;
2078 /* Add the header to the chain */
2080 next
->type
= htype_other
;
2082 header_last
->next
= next
;
2085 /* Check the limit for individual line lengths. This comes after adding to
2086 the chain so that the failing line is reflected if a bounce is generated
2087 (for a local message). */
2089 if (header_line_maxsize
> 0 && next
->slen
> header_line_maxsize
)
2091 log_write(0, LOG_MAIN
, "overlong message header line received from "
2092 "%s (more than %d characters): message abandoned",
2093 sender_host_unknown
? sender_ident
: sender_fullhost
,
2094 header_line_maxsize
);
2098 smtp_reply
= US
"552 A message header line is too long";
2099 receive_swallow_smtp();
2100 goto TIDYUP
; /* Skip to end of function */
2105 give_local_error(ERRMESS_VLONGHDRLINE
,
2106 string_sprintf("message header line longer than %d characters "
2107 "received: message not accepted", header_line_maxsize
), US
"",
2108 error_rc
, stdin
, header_list
->next
);
2109 /* Does not return */
2113 /* Note if any resent- fields exist. */
2115 if (!resents_exist
&& strncmpic(next
->text
, US
"resent-", 7) == 0)
2117 resents_exist
= TRUE
;
2118 resent_prefix
= US
"Resent-";
2122 /* Reject CHUNKING messages that do not CRLF their first header line */
2124 if (!first_line_ended_crlf
&& chunking_state
> CHUNKING_OFFERED
)
2126 log_write(L_size_reject
, LOG_MAIN
|LOG_REJECT
, "rejected from <%s>%s%s%s%s: "
2127 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2129 sender_fullhost
? " H=" : "", sender_fullhost
? sender_fullhost
: US
"",
2130 sender_ident
? " U=" : "", sender_ident
? sender_ident
: US
"");
2131 smtp_printf("552 Message header not CRLF terminated\r\n");
2134 goto TIDYUP
; /* Skip to end of function */
2137 /* The line has been handled. If we have hit EOF, break out of the loop,
2138 indicating no pending data line. */
2140 if (ch
== EOF
) { next
= NULL
; break; }
2142 /* Set up for the next header */
2145 next
= store_get(sizeof(header_line
));
2146 next
->text
= store_get(header_size
);
2149 prevlines_length
= 0;
2150 } /* Continue, starting to read the next header */
2152 /* At this point, we have read all the headers into a data structure in main
2153 store. The first header is still the dummy placeholder for the Received: header
2154 we are going to generate a bit later on. If next != NULL, it contains the first
2155 data line - which terminated the headers before reaching a blank line (not the
2160 debug_printf(">>Headers received:\n");
2161 for (h
= header_list
->next
; h
; h
= h
->next
)
2162 debug_printf("%s", h
->text
);
2166 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2167 is dropped immediately after valid headers, the next thing we will see is EOF.
2168 We must test for this specially, as further down the reading of the data is
2169 skipped if already at EOF. */
2171 if (smtp_input
&& (receive_feof
)())
2173 smtp_reply
= handle_lost_connection(US
" (after header)");
2175 goto TIDYUP
; /* Skip to end of function */
2178 /* If this is a filter test run and no headers were read, output a warning
2179 in case there is a mistake in the test message. */
2181 if (filter_test
!= FTEST_NONE
&& header_list
->next
== NULL
)
2182 printf("Warning: no message headers read\n");
2185 /* Scan the headers to identify them. Some are merely marked for later
2186 processing; some are dealt with here. */
2188 for (h
= header_list
->next
; h
; h
= h
->next
)
2190 BOOL is_resent
= strncmpic(h
->text
, US
"resent-", 7) == 0;
2191 if (is_resent
) contains_resent_headers
= TRUE
;
2193 switch (header_checkname(h
, is_resent
))
2196 h
->type
= htype_bcc
; /* Both Bcc: and Resent-Bcc: */
2200 h
->type
= htype_cc
; /* Both Cc: and Resent-Cc: */
2203 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2206 if (!resents_exist
|| is_resent
) date_header_exists
= TRUE
;
2209 /* Same comments as about Return-Path: below. */
2211 case htype_delivery_date
:
2212 if (delivery_date_remove
) h
->type
= htype_old
;
2215 /* Same comments as about Return-Path: below. */
2217 case htype_envelope_to
:
2218 if (envelope_to_remove
) h
->type
= htype_old
;
2221 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2222 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2223 header consists of just the login id of the user who called Exim, rewrite
2224 it with the gecos field first. Apply this rule to Resent-From: if there
2225 are resent- fields. */
2228 h
->type
= htype_from
;
2229 if (!resents_exist
|| is_resent
)
2235 uschar
*s
= Ustrchr(h
->text
, ':') + 1;
2236 while (isspace(*s
)) s
++;
2237 len
= h
->slen
- (s
- h
->text
) - 1;
2238 if (Ustrlen(originator_login
) == len
&&
2239 strncmpic(s
, originator_login
, len
) == 0)
2241 uschar
*name
= is_resent
? US
"Resent-From" : US
"From";
2242 header_add(htype_from
, "%s: %s <%s@%s>\n", name
, originator_name
,
2243 originator_login
, qualify_domain_sender
);
2244 from_header
= header_last
;
2245 h
->type
= htype_old
;
2246 DEBUG(D_receive
|D_rewrite
)
2247 debug_printf("rewrote \"%s:\" header using gecos\n", name
);
2253 /* Identify the Message-id: header for generating "in-reply-to" in the
2254 autoreply transport. For incoming logging, save any resent- value. In both
2255 cases, take just the first of any multiples. */
2258 if (msgid_header
== NULL
&& (!resents_exist
|| is_resent
))
2265 /* Flag all Received: headers */
2267 case htype_received
:
2268 h
->type
= htype_received
;
2272 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2274 case htype_reply_to
:
2275 h
->type
= htype_reply_to
;
2278 /* The Return-path: header is supposed to be added to messages when
2279 they leave the SMTP system. We shouldn't receive messages that already
2280 contain Return-path. However, since Exim generates Return-path: on
2281 local delivery, resent messages may well contain it. We therefore
2282 provide an option (which defaults on) to remove any Return-path: headers
2283 on input. Removal actually means flagging as "old", which prevents the
2284 header being transmitted with the message. */
2286 case htype_return_path
:
2287 if (return_path_remove
) h
->type
= htype_old
;
2289 /* If we are testing a mail filter file, use the value of the
2290 Return-Path: header to set up the return_path variable, which is not
2291 otherwise set. However, remove any <> that surround the address
2292 because the variable doesn't have these. */
2294 if (filter_test
!= FTEST_NONE
)
2296 uschar
*start
= h
->text
+ 12;
2297 uschar
*end
= start
+ Ustrlen(start
);
2298 while (isspace(*start
)) start
++;
2299 while (end
> start
&& isspace(end
[-1])) end
--;
2300 if (*start
== '<' && end
[-1] == '>')
2305 return_path
= string_copyn(start
, end
- start
);
2306 printf("Return-path taken from \"Return-path:\" header line\n");
2310 /* If there is a "Sender:" header and the message is locally originated,
2311 and from an untrusted caller and suppress_local_fixups is not set, or if we
2312 are in submission mode for a remote message, mark it "old" so that it will
2313 not be transmitted with the message, unless active_local_sender_retain is
2314 set. (This can only be true if active_local_from_check is false.) If there
2315 are any resent- headers in the message, apply this rule to Resent-Sender:
2316 instead of Sender:. Messages with multiple resent- header sets cannot be
2317 tidily handled. (For this reason, at least one MUA - Pine - turns old
2318 resent- headers into X-resent- headers when resending, leaving just one
2322 h
->type
= ((!active_local_sender_retain
&&
2324 (sender_local
&& !trusted_caller
&& !suppress_local_fixups
)
2328 (!resents_exist
||is_resent
))?
2329 htype_old
: htype_sender
;
2332 /* Remember the Subject: header for logging. There is no Resent-Subject */
2338 /* "To:" gets flagged, and the existence of a recipient header is noted,
2339 whether it's resent- or not. */
2344 to_or_cc_header_exists = TRUE;
2350 /* Extract recipients from the headers if that is required (the -t option).
2351 Note that this is documented as being done *before* any address rewriting takes
2352 place. There are two possibilities:
2354 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2355 recipients already listed are to be REMOVED from the message. Smail 3 works
2356 like this. We need to build a non-recipients tree for that list, because in
2357 subsequent processing this data is held in a tree and that's what the
2358 spool_write_header() function expects. Make sure that non-recipient addresses
2359 are fully qualified and rewritten if necessary.
2361 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2362 those in the command line arguments (and it is rumoured some other MTAs do
2363 this). Therefore, there is an option to make Exim behave this way.
2365 *** Notes on "Resent-" header lines ***
2367 The presence of resent-headers in the message makes -t horribly ambiguous.
2368 Experiments with sendmail showed that it uses recipients for all resent-
2369 headers, totally ignoring the concept of "sets of resent- headers" as described
2370 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2371 with all the addresses in one instance of each header.
2373 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2374 error for -t if there were resent- headers in the message. However, after a
2375 discussion on the mailing list, I've learned that there are MUAs that use
2376 resent- headers with -t, and also that the stuff about sets of resent- headers
2377 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2378 message with -t and resent- header lines makes sure that only *its* resent-
2379 headers are present; previous ones are often renamed as X-resent- for example.
2381 Consequently, Exim has been changed so that, if any resent- header lines are
2382 present, the recipients are taken from all of the appropriate resent- lines,
2383 and not from the ordinary To:, Cc:, etc. */
2388 error_block
**bnext
= &bad_addresses
;
2390 if (extract_addresses_remove_arguments
)
2392 while (recipients_count
-- > 0)
2394 uschar
*s
= rewrite_address(recipients_list
[recipients_count
].address
,
2395 TRUE
, TRUE
, global_rewrite_rules
, rewrite_existflags
);
2396 tree_add_nonrecipient(s
);
2398 recipients_list
= NULL
;
2399 recipients_count
= recipients_list_max
= 0;
2402 /* Now scan the headers */
2404 for (h
= header_list
->next
; h
; h
= h
->next
)
2406 if ((h
->type
== htype_to
|| h
->type
== htype_cc
|| h
->type
== htype_bcc
) &&
2407 (!contains_resent_headers
|| strncmpic(h
->text
, US
"resent-", 7) == 0))
2409 uschar
*s
= Ustrchr(h
->text
, ':') + 1;
2410 while (isspace(*s
)) s
++;
2412 parse_allow_group
= TRUE
; /* Allow address group syntax */
2416 uschar
*ss
= parse_find_address_end(s
, FALSE
);
2417 uschar
*recipient
, *errmess
, *p
, *pp
;
2418 int start
, end
, domain
;
2420 /* Check on maximum */
2422 if (recipients_max
> 0 && ++rcount
> recipients_max
)
2424 give_local_error(ERRMESS_TOOMANYRECIP
, US
"too many recipients",
2425 US
"message rejected: ", error_rc
, stdin
, NULL
);
2426 /* Does not return */
2429 /* Make a copy of the address, and remove any internal newlines. These
2430 may be present as a result of continuations of the header line. The
2431 white space that follows the newline must not be removed - it is part
2434 pp
= recipient
= store_get(ss
- s
+ 1);
2435 for (p
= s
; p
< ss
; p
++) if (*p
!= '\n') *pp
++ = *p
;
2440 BOOL b
= allow_utf8_domains
;
2441 allow_utf8_domains
= TRUE
;
2443 recipient
= parse_extract_address(recipient
, &errmess
, &start
, &end
,
2447 if (string_is_utf8(recipient
))
2448 message_smtputf8
= TRUE
;
2450 allow_utf8_domains
= b
;
2454 /* Keep a list of all the bad addresses so we can send a single
2455 error message at the end. However, an empty address is not an error;
2456 just ignore it. This can come from an empty group list like
2458 To: Recipients of list:;
2460 If there are no recipients at all, an error will occur later. */
2462 if (recipient
== NULL
&& Ustrcmp(errmess
, "empty address") != 0)
2464 int len
= Ustrlen(s
);
2465 error_block
*b
= store_get(sizeof(error_block
));
2466 while (len
> 0 && isspace(s
[len
-1])) len
--;
2468 b
->text1
= string_printing(string_copyn(s
, len
));
2474 /* If the recipient is already in the nonrecipients tree, it must
2475 have appeared on the command line with the option extract_addresses_
2476 remove_arguments set. Do not add it to the recipients, and keep a note
2477 that this has happened, in order to give a better error if there are
2478 no recipients left. */
2480 else if (recipient
!= NULL
)
2482 if (tree_search(tree_nonrecipients
, recipient
) == NULL
)
2483 receive_add_recipient(recipient
, -1);
2485 extracted_ignored
= TRUE
;
2488 /* Move on past this address */
2490 s
= ss
+ (*ss
? 1:0);
2491 while (isspace(*s
)) s
++;
2492 } /* Next address */
2494 parse_allow_group
= FALSE
; /* Reset group syntax flags */
2495 parse_found_group
= FALSE
;
2497 /* If this was the bcc: header, mark it "old", which means it
2498 will be kept on the spool, but not transmitted as part of the
2501 if (h
->type
== htype_bcc
) h
->type
= htype_old
;
2502 } /* For appropriate header line */
2503 } /* For each header line */
2507 /* Now build the unique message id. This has changed several times over the
2508 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2509 Retaining all the history in the comment has become too unwieldy - read
2510 previous release sources if you want it.
2512 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2513 The first part is the current time, in seconds. The second part is the current
2514 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2515 can hold a number in the range 0-3843. It used to be a computed sequence
2516 number, but is now the fractional component of the current time in units of
2517 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2518 received, Exim ensures that the timer has ticked at the appropriate level
2519 before proceeding, to avoid duplication if the pid happened to be re-used
2520 within the same time period. It seems likely that most messages will take at
2521 least half a millisecond to be received, so no delay will normally be
2522 necessary. At least for some time...
2524 There is a modification when localhost_number is set. Formerly this was allowed
2525 to be as large as 255. Now it is restricted to the range 0-16, and the final
2526 component of the message id becomes (localhost_number * 200) + fractional time
2527 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2529 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2530 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2531 still allows the tttttt field to hold a large enough number to last for some
2532 more decades, and the final two-digit field can hold numbers up to 1295, which
2533 is enough for milliseconds (instead of 1/2000 of a second).
2535 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2536 pid, so it is probably safe because pids have to be positive. The
2537 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2538 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2540 Note that string_base62() returns its data in a static storage block, so it
2541 must be copied before calling string_base62() again. It always returns exactly
2544 There doesn't seem to be anything in the RFC which requires a message id to
2545 start with a letter, but Smail was changed to ensure this. The external form of
2546 the message id (as supplied by string expansion) therefore starts with an
2547 additional leading 'E'. The spool file names do not include this leading
2548 letter and it is not used internally.
2550 NOTE: If ever the format of message ids is changed, the regular expression for
2551 checking that a string is in this format must be updated in a corresponding
2552 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2553 must also be changed to reflect the correct string length. Then, of course,
2554 other programs that rely on the message id format will need updating too. */
2556 Ustrncpy(message_id
, string_base62((long int)(message_id_tv
.tv_sec
)), 6);
2557 message_id
[6] = '-';
2558 Ustrncpy(message_id
+ 7, string_base62((long int)getpid()), 6);
2560 /* Deal with the case where the host number is set. The value of the number was
2561 checked when it was read, to ensure it isn't too big. The timing granularity is
2562 left in id_resolution so that an appropriate wait can be done after receiving
2563 the message, if necessary (we hope it won't be). */
2565 if (host_number_string
!= NULL
)
2567 id_resolution
= (BASE_62
== 62)? 5000 : 10000;
2568 sprintf(CS(message_id
+ MESSAGE_ID_LENGTH
- 3), "-%2s",
2569 string_base62((long int)(
2570 host_number
* (1000000/id_resolution
) +
2571 message_id_tv
.tv_usec
/id_resolution
)) + 4);
2574 /* Host number not set: final field is just the fractional time at an
2575 appropriate resolution. */
2579 id_resolution
= (BASE_62
== 62)? 500 : 1000;
2580 sprintf(CS(message_id
+ MESSAGE_ID_LENGTH
- 3), "-%2s",
2581 string_base62((long int)(message_id_tv
.tv_usec
/id_resolution
)) + 4);
2584 /* Add the current message id onto the current process info string if
2587 (void)string_format(process_info
+ process_info_len
,
2588 PROCESS_INFO_SIZE
- process_info_len
, " id=%s", message_id
);
2590 /* If we are using multiple input directories, set up the one for this message
2591 to be the least significant base-62 digit of the time of arrival. Otherwise
2592 ensure that it is an empty string. */
2594 message_subdir
[0] = split_spool_directory
? message_id
[5] : 0;
2596 /* Now that we have the message-id, if there is no message-id: header, generate
2597 one, but only for local (without suppress_local_fixups) or submission mode
2598 messages. This can be user-configured if required, but we had better flatten
2599 any illegal characters therein. */
2601 if (msgid_header
== NULL
&&
2602 ((sender_host_address
== NULL
&& !suppress_local_fixups
)
2603 || submission_mode
))
2606 uschar
*id_text
= US
"";
2607 uschar
*id_domain
= primary_hostname
;
2609 /* Permit only letters, digits, dots, and hyphens in the domain */
2611 if (message_id_domain
!= NULL
)
2613 uschar
*new_id_domain
= expand_string(message_id_domain
);
2614 if (new_id_domain
== NULL
)
2616 if (!expand_string_forcedfail
)
2617 log_write(0, LOG_MAIN
|LOG_PANIC
,
2618 "expansion of \"%s\" (message_id_header_domain) "
2619 "failed: %s", message_id_domain
, expand_string_message
);
2621 else if (*new_id_domain
!= 0)
2623 id_domain
= new_id_domain
;
2624 for (p
= id_domain
; *p
!= 0; p
++)
2625 if (!isalnum(*p
) && *p
!= '.') *p
= '-'; /* No need to test '-' ! */
2629 /* Permit all characters except controls and RFC 2822 specials in the
2630 additional text part. */
2632 if (message_id_text
!= NULL
)
2634 uschar
*new_id_text
= expand_string(message_id_text
);
2635 if (new_id_text
== NULL
)
2637 if (!expand_string_forcedfail
)
2638 log_write(0, LOG_MAIN
|LOG_PANIC
,
2639 "expansion of \"%s\" (message_id_header_text) "
2640 "failed: %s", message_id_text
, expand_string_message
);
2642 else if (*new_id_text
!= 0)
2644 id_text
= new_id_text
;
2645 for (p
= id_text
; *p
!= 0; p
++)
2646 if (mac_iscntrl_or_special(*p
)) *p
= '-';
2650 /* Add the header line
2651 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2652 * appended, to preserve classical expectations of header ordering. */
2654 header_add_at_position(!resents_exist
, NULL
, FALSE
, htype_id
,
2655 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix
, message_id_external
,
2656 (*id_text
== 0)? "" : ".", id_text
, id_domain
);
2659 /* If we are to log recipients, keep a copy of the raw ones before any possible
2660 rewriting. Must copy the count, because later ACLs and the local_scan()
2661 function may mess with the real recipients. */
2663 if (LOGGING(received_recipients
))
2665 raw_recipients
= store_get(recipients_count
* sizeof(uschar
*));
2666 for (i
= 0; i
< recipients_count
; i
++)
2667 raw_recipients
[i
] = string_copy(recipients_list
[i
].address
);
2668 raw_recipients_count
= recipients_count
;
2671 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2672 recipients will get here only if the conditions were right (allow_unqualified_
2673 recipient is TRUE). */
2675 for (i
= 0; i
< recipients_count
; i
++)
2676 recipients_list
[i
].address
=
2677 rewrite_address(recipients_list
[i
].address
, TRUE
, TRUE
,
2678 global_rewrite_rules
, rewrite_existflags
);
2680 /* If there is no From: header, generate one for local (without
2681 suppress_local_fixups) or submission_mode messages. If there is no sender
2682 address, but the sender is local or this is a local delivery error, use the
2683 originator login. This shouldn't happen for genuine bounces, but might happen
2684 for autoreplies. The addition of From: must be done *before* checking for the
2685 possible addition of a Sender: header, because untrusted_set_sender allows an
2686 untrusted user to set anything in the envelope (which might then get info
2687 From:) but we still want to ensure a valid Sender: if it is required. */
2689 if (from_header
== NULL
&&
2690 ((sender_host_address
== NULL
&& !suppress_local_fixups
)
2691 || submission_mode
))
2693 uschar
*oname
= US
"";
2695 /* Use the originator_name if this is a locally submitted message and the
2696 caller is not trusted. For trusted callers, use it only if -F was used to
2697 force its value or if we have a non-SMTP message for which -f was not used
2698 to set the sender. */
2700 if (sender_host_address
== NULL
)
2702 if (!trusted_caller
|| sender_name_forced
||
2703 (!smtp_input
&& !sender_address_forced
))
2704 oname
= originator_name
;
2707 /* For non-locally submitted messages, the only time we use the originator
2708 name is when it was forced by the /name= option on control=submission. */
2712 if (submission_name
!= NULL
) oname
= submission_name
;
2715 /* Envelope sender is empty */
2717 if (sender_address
[0] == 0)
2719 uschar
*fromstart
, *fromend
;
2721 fromstart
= string_sprintf("%sFrom: %s%s", resent_prefix
,
2722 oname
, (oname
[0] == 0)? "" : " <");
2723 fromend
= (oname
[0] == 0)? US
"" : US
">";
2725 if (sender_local
|| local_error_message
)
2727 header_add(htype_from
, "%s%s@%s%s\n", fromstart
,
2728 local_part_quote(originator_login
), qualify_domain_sender
,
2731 else if (submission_mode
&& authenticated_id
!= NULL
)
2733 if (submission_domain
== NULL
)
2735 header_add(htype_from
, "%s%s@%s%s\n", fromstart
,
2736 local_part_quote(authenticated_id
), qualify_domain_sender
,
2739 else if (submission_domain
[0] == 0) /* empty => whole address set */
2741 header_add(htype_from
, "%s%s%s\n", fromstart
, authenticated_id
,
2746 header_add(htype_from
, "%s%s@%s%s\n", fromstart
,
2747 local_part_quote(authenticated_id
), submission_domain
,
2750 from_header
= header_last
; /* To get it checked for Sender: */
2754 /* There is a non-null envelope sender. Build the header using the original
2755 sender address, before any rewriting that might have been done while
2760 header_add(htype_from
, "%sFrom: %s%s%s%s\n", resent_prefix
,
2762 (oname
[0] == 0)? "" : " <",
2763 (sender_address_unrewritten
== NULL
)?
2764 sender_address
: sender_address_unrewritten
,
2765 (oname
[0] == 0)? "" : ">");
2767 from_header
= header_last
; /* To get it checked for Sender: */
2772 /* If the sender is local (without suppress_local_fixups), or if we are in
2773 submission mode and there is an authenticated_id, check that an existing From:
2774 is correct, and if not, generate a Sender: header, unless disabled. Any
2775 previously-existing Sender: header was removed above. Note that sender_local,
2776 as well as being TRUE if the caller of exim is not trusted, is also true if a
2777 trusted caller did not supply a -f argument for non-smtp input. To allow
2778 trusted callers to forge From: without supplying -f, we have to test explicitly
2779 here. If the From: header contains more than one address, then the call to
2780 parse_extract_address fails, and a Sender: header is inserted, as required. */
2782 if (from_header
!= NULL
&&
2783 (active_local_from_check
&&
2784 ((sender_local
&& !trusted_caller
&& !suppress_local_fixups
) ||
2785 (submission_mode
&& authenticated_id
!= NULL
))
2788 BOOL make_sender
= TRUE
;
2789 int start
, end
, domain
;
2791 uschar
*from_address
=
2792 parse_extract_address(Ustrchr(from_header
->text
, ':') + 1, &errmess
,
2793 &start
, &end
, &domain
, FALSE
);
2794 uschar
*generated_sender_address
;
2796 if (submission_mode
)
2798 if (submission_domain
== NULL
)
2800 generated_sender_address
= string_sprintf("%s@%s",
2801 local_part_quote(authenticated_id
), qualify_domain_sender
);
2803 else if (submission_domain
[0] == 0) /* empty => full address */
2805 generated_sender_address
= string_sprintf("%s",
2810 generated_sender_address
= string_sprintf("%s@%s",
2811 local_part_quote(authenticated_id
), submission_domain
);
2815 generated_sender_address
= string_sprintf("%s@%s",
2816 local_part_quote(originator_login
), qualify_domain_sender
);
2818 /* Remove permitted prefixes and suffixes from the local part of the From:
2819 address before doing the comparison with the generated sender. */
2821 if (from_address
!= NULL
)
2824 uschar
*at
= (domain
== 0)? NULL
: from_address
+ domain
- 1;
2826 if (at
!= NULL
) *at
= 0;
2827 from_address
+= route_check_prefix(from_address
, local_from_prefix
);
2828 slen
= route_check_suffix(from_address
, local_from_suffix
);
2831 memmove(from_address
+slen
, from_address
, Ustrlen(from_address
)-slen
);
2832 from_address
+= slen
;
2834 if (at
!= NULL
) *at
= '@';
2836 if (strcmpic(generated_sender_address
, from_address
) == 0 ||
2837 (domain
== 0 && strcmpic(from_address
, originator_login
) == 0))
2838 make_sender
= FALSE
;
2841 /* We have to cause the Sender header to be rewritten if there are
2842 appropriate rewriting rules. */
2846 if (submission_mode
&& submission_name
== NULL
)
2847 header_add(htype_sender
, "%sSender: %s\n", resent_prefix
,
2848 generated_sender_address
);
2850 header_add(htype_sender
, "%sSender: %s <%s>\n",
2852 submission_mode
? submission_name
: originator_name
,
2853 generated_sender_address
);
2856 /* Ensure that a non-null envelope sender address corresponds to the
2857 submission mode sender address. */
2859 if (submission_mode
&& sender_address
[0] != 0)
2861 if (sender_address_unrewritten
== NULL
)
2862 sender_address_unrewritten
= sender_address
;
2863 sender_address
= generated_sender_address
;
2864 if (Ustrcmp(sender_address_unrewritten
, generated_sender_address
) != 0)
2865 log_write(L_address_rewrite
, LOG_MAIN
,
2866 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2867 sender_address_unrewritten
, generated_sender_address
);
2871 /* If there are any rewriting rules, apply them to the sender address, unless
2872 it has already been rewritten as part of verification for SMTP input. */
2874 if (global_rewrite_rules
!= NULL
&& sender_address_unrewritten
== NULL
&&
2875 sender_address
[0] != 0)
2877 sender_address
= rewrite_address(sender_address
, FALSE
, TRUE
,
2878 global_rewrite_rules
, rewrite_existflags
);
2879 DEBUG(D_receive
|D_rewrite
)
2880 debug_printf("rewritten sender = %s\n", sender_address
);
2884 /* The headers must be run through rewrite_header(), because it ensures that
2885 addresses are fully qualified, as well as applying any rewriting rules that may
2888 Qualification of header addresses in a message from a remote host happens only
2889 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2890 appropriate. For local messages, qualification always happens, unless -bnq is
2891 used to explicitly suppress it. No rewriting is done for an unqualified address
2892 that is left untouched.
2894 We start at the second header, skipping our own Received:. This rewriting is
2895 documented as happening *after* recipient addresses are taken from the headers
2896 by the -t command line option. An added Sender: gets rewritten here. */
2898 for (h
= header_list
->next
; h
; h
= h
->next
)
2900 header_line
*newh
= rewrite_header(h
, NULL
, NULL
, global_rewrite_rules
,
2901 rewrite_existflags
, TRUE
);
2906 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2907 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2908 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2909 exists, this applies to the set of resent- headers rather than the normal set.
2911 The requirement for a recipient header has been removed in RFC 2822. At this
2912 point in the code, earlier versions of Exim added a To: header for locally
2913 submitted messages, and an empty Bcc: header for others. In the light of the
2914 changes in RFC 2822, this was dropped in November 2003. */
2917 /* If there is no date header, generate one if the message originates locally
2918 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2919 submission mode flag is set. Messages without Date: are not valid, but it seems
2920 to be more confusing if Exim adds one to all remotely-originated messages.
2921 As per Message-Id, we prepend if resending, else append.
2924 if (!date_header_exists
&&
2925 ((sender_host_address
== NULL
&& !suppress_local_fixups
)
2926 || submission_mode
))
2927 header_add_at_position(!resents_exist
, NULL
, FALSE
, htype_other
,
2928 "%sDate: %s\n", resent_prefix
, tod_stamp(tod_full
));
2930 search_tidyup(); /* Free any cached resources */
2932 /* Show the complete set of headers if debugging. Note that the first one (the
2933 new Received:) has not yet been set. */
2937 debug_printf(">>Headers after rewriting and local additions:\n");
2938 for (h
= header_list
->next
; h
!= NULL
; h
= h
->next
)
2939 debug_printf("%c %s", h
->type
, h
->text
);
2943 /* The headers are now complete in store. If we are running in filter
2944 testing mode, that is all this function does. Return TRUE if the message
2945 ended with a dot. */
2947 if (filter_test
!= FTEST_NONE
)
2949 process_info
[process_info_len
] = 0;
2950 return message_ended
== END_DOT
;
2953 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2954 think more if it could be handled. Cannot do onward CHUNKING unless
2955 inbound is, but inbound chunking ought to be ok with outbound plain.
2956 Could we do onward CHUNKING given inbound CHUNKING?
2958 if (chunking_state
> CHUNKING_OFFERED
)
2959 cancel_cutthrough_connection("chunking active");
2961 /* Cutthrough delivery:
2962 We have to create the Received header now rather than at the end of reception,
2963 so the timestamp behaviour is a change to the normal case.
2964 XXX Ensure this gets documented XXX.
2965 Having created it, send the headers to the destination. */
2966 if (cutthrough
.fd
>= 0)
2968 if (received_count
> received_headers_max
)
2970 cancel_cutthrough_connection("too many headers");
2971 if (smtp_input
) receive_swallow_smtp(); /* Swallow incoming SMTP */
2972 log_write(0, LOG_MAIN
|LOG_REJECT
, "rejected from <%s>%s%s%s%s: "
2973 "Too many \"Received\" headers",
2975 (sender_fullhost
== NULL
)? "" : " H=",
2976 (sender_fullhost
== NULL
)? US
"" : sender_fullhost
,
2977 (sender_ident
== NULL
)? "" : " U=",
2978 (sender_ident
== NULL
)? US
"" : sender_ident
);
2979 message_id
[0] = 0; /* Indicate no message accepted */
2980 smtp_reply
= US
"550 Too many \"Received\" headers - suspected mail loop";
2981 goto TIDYUP
; /* Skip to end of function */
2983 received_header_gen();
2984 add_acl_headers(ACL_WHERE_RCPT
, US
"MAIL or RCPT");
2985 (void) cutthrough_headers_send();
2989 /* Open a new spool file for the data portion of the message. We need
2990 to access it both via a file descriptor and a stream. Try to make the
2991 directory if it isn't there. */
2993 spool_name
= spool_fname(US
"input", message_subdir
, message_id
, US
"-D");
2994 DEBUG(D_receive
) debug_printf("Data file name: %s\n", spool_name
);
2996 if ((data_fd
= Uopen(spool_name
, O_RDWR
|O_CREAT
|O_EXCL
, SPOOL_MODE
)) < 0)
2998 if (errno
== ENOENT
)
3000 (void) directory_make(spool_directory
,
3001 spool_sname(US
"input", message_subdir
),
3002 INPUT_DIRECTORY_MODE
, TRUE
);
3003 data_fd
= Uopen(spool_name
, O_RDWR
|O_CREAT
|O_EXCL
, SPOOL_MODE
);
3006 log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "Failed to create spool file %s: %s",
3007 spool_name
, strerror(errno
));
3010 /* Make sure the file's group is the Exim gid, and double-check the mode
3011 because the group setting doesn't always get set automatically. */
3013 if (fchown(data_fd
, exim_uid
, exim_gid
))
3014 log_write(0, LOG_MAIN
|LOG_PANIC_DIE
,
3015 "Failed setting ownership on spool file %s: %s",
3016 spool_name
, strerror(errno
));
3017 (void)fchmod(data_fd
, SPOOL_MODE
);
3019 /* We now have data file open. Build a stream for it and lock it. We lock only
3020 the first line of the file (containing the message ID) because otherwise there
3021 are problems when Exim is run under Cygwin (I'm told). See comments in
3022 spool_in.c, where the same locking is done. */
3024 data_file
= fdopen(data_fd
, "w+");
3025 lock_data
.l_type
= F_WRLCK
;
3026 lock_data
.l_whence
= SEEK_SET
;
3027 lock_data
.l_start
= 0;
3028 lock_data
.l_len
= SPOOL_DATA_START_OFFSET
;
3030 if (fcntl(data_fd
, F_SETLK
, &lock_data
) < 0)
3031 log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "Cannot lock %s (%d): %s", spool_name
,
3032 errno
, strerror(errno
));
3034 /* We have an open, locked data file. Write the message id to it to make it
3035 self-identifying. Then read the remainder of the input of this message and
3036 write it to the data file. If the variable next != NULL, it contains the first
3037 data line (which was read as a header but then turned out not to have the right
3038 format); write it (remembering that it might contain binary zeros). The result
3039 of fwrite() isn't inspected; instead we call ferror() below. */
3041 fprintf(data_file
, "%s-D\n", message_id
);
3044 uschar
*s
= next
->text
;
3045 int len
= next
->slen
;
3046 len
= fwrite(s
, 1, len
, data_file
); len
= len
; /* compiler quietening */
3047 body_linecount
++; /* Assumes only 1 line */
3050 /* Note that we might already be at end of file, or the logical end of file
3051 (indicated by '.'), or might have encountered an error while writing the
3052 message id or "next" line. */
3054 if (!ferror(data_file
) && !(receive_feof
)() && message_ended
!= END_DOT
)
3058 message_ended
= chunking_state
> CHUNKING_OFFERED
3059 ? read_message_bdat_smtp(data_file
)
3060 : read_message_data_smtp(data_file
);
3061 receive_linecount
++; /* The terminating "." line */
3063 else message_ended
= read_message_data(data_file
);
3065 receive_linecount
+= body_linecount
; /* For BSMTP errors mainly */
3066 message_linecount
+= body_linecount
;
3068 switch (message_ended
)
3070 /* Handle premature termination of SMTP */
3075 Uunlink(spool_name
); /* Lose data file when closed */
3076 cancel_cutthrough_connection("sender closed connection");
3077 message_id
[0] = 0; /* Indicate no message accepted */
3078 smtp_reply
= handle_lost_connection(US
"");
3080 goto TIDYUP
; /* Skip to end of function */
3084 /* Handle message that is too big. Don't use host_or_ident() in the log
3085 message; we want to see the ident value even for non-remote messages. */
3088 Uunlink(spool_name
); /* Lose the data file when closed */
3089 cancel_cutthrough_connection("mail too big");
3090 if (smtp_input
) receive_swallow_smtp(); /* Swallow incoming SMTP */
3092 log_write(L_size_reject
, LOG_MAIN
|LOG_REJECT
, "rejected from <%s>%s%s%s%s: "
3093 "message too big: read=%d max=%d",
3095 (sender_fullhost
== NULL
)? "" : " H=",
3096 (sender_fullhost
== NULL
)? US
"" : sender_fullhost
,
3097 (sender_ident
== NULL
)? "" : " U=",
3098 (sender_ident
== NULL
)? US
"" : sender_ident
,
3100 thismessage_size_limit
);
3104 smtp_reply
= US
"552 Message size exceeds maximum permitted";
3105 message_id
[0] = 0; /* Indicate no message accepted */
3106 goto TIDYUP
; /* Skip to end of function */
3110 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3111 give_local_error(ERRMESS_TOOBIG
,
3112 string_sprintf("message too big (max=%d)", thismessage_size_limit
),
3113 US
"message rejected: ", error_rc
, data_file
, header_list
);
3114 /* Does not return */
3118 /* Handle bad BDAT protocol sequence */
3121 Uunlink(spool_name
); /* Lose the data file when closed */
3122 cancel_cutthrough_connection("sender protocol error");
3123 smtp_reply
= US
""; /* Response already sent */
3124 message_id
[0] = 0; /* Indicate no message accepted */
3125 goto TIDYUP
; /* Skip to end of function */
3129 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3130 example, there may be some expansion in an ACL that uses a timer.) */
3132 os_non_restarting_signal(SIGALRM
, sigalrm_handler
);
3134 /* The message body has now been read into the data file. Call fflush() to
3135 empty the buffers in C, and then call fsync() to get the data written out onto
3136 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3137 having to do this). If there was an I/O error on either input or output,
3138 attempt to send an error message, and unlink the spool file. For non-SMTP input
3139 we can then give up. Note that for SMTP input we must swallow the remainder of
3140 the input in cases of output errors, since the far end doesn't expect to see
3141 anything until the terminating dot line is sent. */
3143 if (fflush(data_file
) == EOF
|| ferror(data_file
) ||
3144 EXIMfsync(fileno(data_file
)) < 0 || (receive_ferror
)())
3146 uschar
*msg_errno
= US
strerror(errno
);
3147 BOOL input_error
= (receive_ferror
)() != 0;
3148 uschar
*msg
= string_sprintf("%s error (%s) while receiving message from %s",
3149 input_error
? "Input read" : "Spool write",
3151 (sender_fullhost
!= NULL
)? sender_fullhost
: sender_ident
);
3153 log_write(0, LOG_MAIN
, "Message abandoned: %s", msg
);
3154 Uunlink(spool_name
); /* Lose the data file */
3155 cancel_cutthrough_connection("error writing spoolfile");
3160 smtp_reply
= US
"451 Error while reading input data";
3163 smtp_reply
= US
"451 Error while writing spool file";
3164 receive_swallow_smtp();
3166 message_id
[0] = 0; /* Indicate no message accepted */
3167 goto TIDYUP
; /* Skip to end of function */
3172 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3173 give_local_error(ERRMESS_IOERR
, msg
, US
"", error_rc
, data_file
,
3175 /* Does not return */
3180 /* No I/O errors were encountered while writing the data file. */
3182 DEBUG(D_receive
) debug_printf("Data file written for message %s\n", message_id
);
3185 /* If there were any bad addresses extracted by -t, or there were no recipients
3186 left after -t, send a message to the sender of this message, or write it to
3187 stderr if the error handling option is set that way. Note that there may
3188 legitimately be no recipients for an SMTP message if they have all been removed
3191 We need to rewind the data file in order to read it. In the case of no
3192 recipients or stderr error writing, throw the data file away afterwards, and
3193 exit. (This can't be SMTP, which always ensures there's at least one
3194 syntactically good recipient address.) */
3196 if (extract_recip
&& (bad_addresses
!= NULL
|| recipients_count
== 0))
3200 if (recipients_count
== 0) debug_printf("*** No recipients\n");
3201 if (bad_addresses
!= NULL
)
3203 error_block
*eblock
= bad_addresses
;
3204 debug_printf("*** Bad address(es)\n");
3205 while (eblock
!= NULL
)
3207 debug_printf(" %s: %s\n", eblock
->text1
, eblock
->text2
);
3208 eblock
= eblock
->next
;
3213 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3215 /* If configured to send errors to the sender, but this fails, force
3216 a failure error code. We use a special one for no recipients so that it
3217 can be detected by the autoreply transport. Otherwise error_rc is set to
3218 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3219 it is EXIT_SUCCESS. */
3221 if (error_handling
== ERRORS_SENDER
)
3223 if (!moan_to_sender(
3224 (bad_addresses
== NULL
)?
3225 (extracted_ignored
? ERRMESS_IGADDRESS
: ERRMESS_NOADDRESS
) :
3226 (recipients_list
== NULL
)? ERRMESS_BADNOADDRESS
: ERRMESS_BADADDRESS
,
3227 bad_addresses
, header_list
, data_file
, FALSE
))
3228 error_rc
= (bad_addresses
== NULL
)? EXIT_NORECIPIENTS
: EXIT_FAILURE
;
3232 if (bad_addresses
== NULL
)
3234 if (extracted_ignored
)
3235 fprintf(stderr
, "exim: all -t recipients overridden by command line\n");
3237 fprintf(stderr
, "exim: no recipients in message\n");
3241 fprintf(stderr
, "exim: invalid address%s",
3242 (bad_addresses
->next
== NULL
)? ":" : "es:\n");
3243 while (bad_addresses
!= NULL
)
3245 fprintf(stderr
, " %s: %s\n", bad_addresses
->text1
,
3246 bad_addresses
->text2
);
3247 bad_addresses
= bad_addresses
->next
;
3252 if (recipients_count
== 0 || error_handling
== ERRORS_STDERR
)
3254 Uunlink(spool_name
);
3255 (void)fclose(data_file
);
3256 exim_exit(error_rc
);
3260 /* Data file successfully written. Generate text for the Received: header by
3261 expanding the configured string, and adding a timestamp. By leaving this
3262 operation till now, we ensure that the timestamp is the time that message
3263 reception was completed. However, this is deliberately done before calling the
3264 data ACL and local_scan().
3266 This Received: header may therefore be inspected by the data ACL and by code in
3267 the local_scan() function. When they have run, we update the timestamp to be
3268 the final time of reception.
3270 If there is just one recipient, set up its value in the $received_for variable
3271 for use when we generate the Received: header.
3273 Note: the checking for too many Received: headers is handled by the delivery
3275 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3277 if (received_header
->text
== NULL
) /* Non-cutthrough case */
3279 received_header_gen();
3281 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3283 message_body_size
= (fstat(data_fd
, &statbuf
) == 0)?
3284 statbuf
.st_size
- SPOOL_DATA_START_OFFSET
: -1;
3286 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3287 now, before running the DATA ACL. */
3289 add_acl_headers(ACL_WHERE_RCPT
, US
"MAIL or RCPT");
3292 message_body_size
= (fstat(data_fd
, &statbuf
) == 0)?
3293 statbuf
.st_size
- SPOOL_DATA_START_OFFSET
: -1;
3295 /* If an ACL is specified for checking things at this stage of reception of a
3296 message, run it, unless all the recipients were removed by "discard" in earlier
3297 ACLs. That is the only case in which recipients_count can be zero at this
3298 stage. Set deliver_datafile to point to the data file so that $message_body and
3299 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3302 deliver_datafile
= data_fd
;
3305 enable_dollar_recipients
= TRUE
;
3307 if (recipients_count
== 0)
3308 blackholed_by
= recipients_discarded
? US
"MAIL ACL" : US
"RCPT ACL";
3312 /* Handle interactive SMTP messages */
3314 if (smtp_input
&& !smtp_batched_input
)
3317 #ifndef DISABLE_DKIM
3318 if (!dkim_disable_verify
)
3320 /* Finish verification, this will log individual signature results to
3322 dkim_exim_verify_finish();
3324 /* Check if we must run the DKIM ACL */
3325 if (acl_smtp_dkim
&& dkim_verify_signers
&& *dkim_verify_signers
)
3327 uschar
*dkim_verify_signers_expanded
=
3328 expand_string(dkim_verify_signers
);
3329 if (!dkim_verify_signers_expanded
)
3330 log_write(0, LOG_MAIN
|LOG_PANIC
,
3331 "expansion of dkim_verify_signers option failed: %s",
3332 expand_string_message
);
3337 const uschar
*ptr
= dkim_verify_signers_expanded
;
3338 uschar
*item
= NULL
;
3339 uschar
*seen_items
= NULL
;
3340 int seen_items_size
= 0;
3341 int seen_items_offset
= 0;
3342 /* Default to OK when no items are present */
3344 while ((item
= string_nextinlist(&ptr
, &sep
, NULL
, 0)))
3346 /* Prevent running ACL for an empty item */
3347 if (!item
|| !*item
) continue;
3349 /* Only run ACL once for each domain or identity,
3350 no matter how often it appears in the expanded list. */
3353 uschar
*seen_item
= NULL
;
3354 const uschar
*seen_items_list
= seen_items
;
3355 BOOL seen_this_item
= FALSE
;
3357 while ((seen_item
= string_nextinlist(&seen_items_list
, &sep
,
3359 if (Ustrcmp(seen_item
,item
) == 0)
3361 seen_this_item
= TRUE
;
3368 debug_printf("acl_smtp_dkim: skipping signer %s, "
3369 "already seen\n", item
);
3373 seen_items
= string_append(seen_items
, &seen_items_size
,
3374 &seen_items_offset
, 1, ":");
3377 seen_items
= string_append(seen_items
, &seen_items_size
,
3378 &seen_items_offset
, 1, item
);
3379 seen_items
[seen_items_offset
] = '\0';
3382 debug_printf("calling acl_smtp_dkim for dkim_cur_signer=%s\n",
3385 dkim_exim_acl_setup(item
);
3386 rc
= acl_check(ACL_WHERE_DKIM
, NULL
, acl_smtp_dkim
,
3387 &user_msg
, &log_msg
);
3392 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3393 "skipping remaining items\n", rc
, item
);
3394 cancel_cutthrough_connection("dkim acl not ok");
3398 add_acl_headers(ACL_WHERE_DKIM
, US
"DKIM");
3401 recipients_count
= 0;
3402 blackholed_by
= US
"DKIM ACL";
3403 if (log_msg
!= NULL
)
3404 blackhole_log_msg
= string_sprintf(": %s", log_msg
);
3408 Uunlink(spool_name
);
3409 if (smtp_handle_acl_fail(ACL_WHERE_DKIM
, rc
, user_msg
, log_msg
) != 0)
3410 smtp_yield
= FALSE
; /* No more messages after dropped connection */
3411 smtp_reply
= US
""; /* Indicate reply already sent */
3412 message_id
[0] = 0; /* Indicate no message accepted */
3413 goto TIDYUP
; /* Skip to end of function */
3418 #endif /* DISABLE_DKIM */
3420 #ifdef WITH_CONTENT_SCAN
3421 if (recipients_count
> 0 &&
3422 acl_smtp_mime
!= NULL
&&
3423 !run_mime_acl(acl_smtp_mime
, &smtp_yield
, &smtp_reply
, &blackholed_by
))
3425 #endif /* WITH_CONTENT_SCAN */
3427 #ifdef EXPERIMENTAL_DMARC
3428 dmarc_up
= dmarc_store_data(from_header
);
3429 #endif /* EXPERIMENTAL_DMARC */
3431 #ifndef DISABLE_PRDR
3432 if (prdr_requested
&& recipients_count
> 1 && acl_smtp_data_prdr
)
3436 int all_fail
= FAIL
;
3438 smtp_printf("353 PRDR content analysis beginning\r\n");
3439 /* Loop through recipients, responses must be in same order received */
3440 for (c
= 0; recipients_count
> c
; c
++)
3442 uschar
* addr
= recipients_list
[c
].address
;
3443 uschar
* msg
= US
"PRDR R=<%s> %s";
3446 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3447 addr
, c
+1, recipients_count
);
3448 rc
= acl_check(ACL_WHERE_PRDR
, addr
,
3449 acl_smtp_data_prdr
, &user_msg
, &log_msg
);
3451 /* If any recipient rejected content, indicate it in final message */
3453 /* If all recipients rejected, indicate in final message */
3458 case OK
: case DISCARD
: code
= US
"250"; break;
3459 case DEFER
: code
= US
"450"; break;
3460 default: code
= US
"550"; break;
3462 if (user_msg
!= NULL
)
3463 smtp_user_msg(code
, user_msg
);
3468 case OK
: case DISCARD
:
3469 msg
= string_sprintf(CS msg
, addr
, "acceptance"); break;
3471 msg
= string_sprintf(CS msg
, addr
, "temporary refusal"); break;
3473 msg
= string_sprintf(CS msg
, addr
, "refusal"); break;
3475 smtp_user_msg(code
, msg
);
3477 if (log_msg
) log_write(0, LOG_MAIN
, "PRDR %s %s", addr
, log_msg
);
3478 else if (user_msg
) log_write(0, LOG_MAIN
, "PRDR %s %s", addr
, user_msg
);
3479 else log_write(0, LOG_MAIN
, "%s", CS msg
);
3481 if (rc
!= OK
) { receive_remove_recipient(addr
); c
--; }
3483 /* Set up final message, used if data acl gives OK */
3484 smtp_reply
= string_sprintf("%s id=%s message %s",
3485 all_fail
== FAIL
? US
"550" : US
"250",
3488 ? US
"rejected for all recipients"
3491 : US
"accepted for some recipients");
3492 if (recipients_count
== 0)
3494 message_id
[0] = 0; /* Indicate no message accepted */
3499 prdr_requested
= FALSE
;
3500 #endif /* !DISABLE_PRDR */
3502 /* Check the recipients count again, as the MIME ACL might have changed
3505 if (acl_smtp_data
!= NULL
&& recipients_count
> 0)
3507 rc
= acl_check(ACL_WHERE_DATA
, NULL
, acl_smtp_data
, &user_msg
, &log_msg
);
3508 add_acl_headers(ACL_WHERE_DATA
, US
"DATA");
3511 recipients_count
= 0;
3512 blackholed_by
= US
"DATA ACL";
3513 if (log_msg
!= NULL
)
3514 blackhole_log_msg
= string_sprintf(": %s", log_msg
);
3515 cancel_cutthrough_connection("data acl discard");
3519 Uunlink(spool_name
);
3520 cancel_cutthrough_connection("data acl not ok");
3521 #ifdef WITH_CONTENT_SCAN
3524 #ifdef EXPERIMENTAL_DCC
3527 if (smtp_handle_acl_fail(ACL_WHERE_DATA
, rc
, user_msg
, log_msg
) != 0)
3528 smtp_yield
= FALSE
; /* No more messages after dropped connection */
3529 smtp_reply
= US
""; /* Indicate reply already sent */
3530 message_id
[0] = 0; /* Indicate no message accepted */
3531 goto TIDYUP
; /* Skip to end of function */
3536 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
3537 we cannot take different actions for permanent and temporary rejections. */
3542 #ifdef WITH_CONTENT_SCAN
3543 if (acl_not_smtp_mime
!= NULL
&&
3544 !run_mime_acl(acl_not_smtp_mime
, &smtp_yield
, &smtp_reply
,
3547 #endif /* WITH_CONTENT_SCAN */
3549 if (acl_not_smtp
!= NULL
)
3551 uschar
*user_msg
, *log_msg
;
3552 rc
= acl_check(ACL_WHERE_NOTSMTP
, NULL
, acl_not_smtp
, &user_msg
, &log_msg
);
3555 recipients_count
= 0;
3556 blackholed_by
= US
"non-SMTP ACL";
3557 if (log_msg
!= NULL
)
3558 blackhole_log_msg
= string_sprintf(": %s", log_msg
);
3562 Uunlink(spool_name
);
3563 #ifdef WITH_CONTENT_SCAN
3566 #ifdef EXPERIMENTAL_DCC
3569 /* The ACL can specify where rejections are to be logged, possibly
3570 nowhere. The default is main and reject logs. */
3572 if (log_reject_target
!= 0)
3573 log_write(0, log_reject_target
, "F=<%s> rejected by non-SMTP ACL: %s",
3574 sender_address
, log_msg
);
3576 if (user_msg
== NULL
) user_msg
= US
"local configuration problem";
3577 if (smtp_batched_input
)
3579 moan_smtp_batch(NULL
, "%d %s", 550, user_msg
);
3580 /* Does not return */
3584 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3585 give_local_error(ERRMESS_LOCAL_ACL
, user_msg
,
3586 US
"message rejected by non-SMTP ACL: ", error_rc
, data_file
,
3588 /* Does not return */
3591 add_acl_headers(ACL_WHERE_NOTSMTP
, US
"non-SMTP");
3595 /* The applicable ACLs have been run */
3597 if (deliver_freeze
) frozen_by
= US
"ACL"; /* for later logging */
3598 if (queue_only_policy
) queued_by
= US
"ACL";
3601 #ifdef WITH_CONTENT_SCAN
3605 #ifdef EXPERIMENTAL_DCC
3610 /* The final check on the message is to run the scan_local() function. The
3611 version supplied with Exim always accepts, but this is a hook for sysadmins to
3612 supply their own checking code. The local_scan() function is run even when all
3613 the recipients have been discarded. */
3615 lseek(data_fd
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3617 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3618 deleted, and the incident gets logged. */
3620 os_non_restarting_signal(SIGSEGV
, local_scan_crash_handler
);
3621 os_non_restarting_signal(SIGFPE
, local_scan_crash_handler
);
3622 os_non_restarting_signal(SIGILL
, local_scan_crash_handler
);
3623 os_non_restarting_signal(SIGBUS
, local_scan_crash_handler
);
3625 DEBUG(D_receive
) debug_printf("calling local_scan(); timeout=%d\n",
3626 local_scan_timeout
);
3627 local_scan_data
= NULL
;
3629 os_non_restarting_signal(SIGALRM
, local_scan_timeout_handler
);
3630 if (local_scan_timeout
> 0) alarm(local_scan_timeout
);
3631 rc
= local_scan(data_fd
, &local_scan_data
);
3633 os_non_restarting_signal(SIGALRM
, sigalrm_handler
);
3635 enable_dollar_recipients
= FALSE
;
3637 store_pool
= POOL_MAIN
; /* In case changed */
3638 DEBUG(D_receive
) debug_printf("local_scan() returned %d %s\n", rc
,
3641 os_non_restarting_signal(SIGSEGV
, SIG_DFL
);
3642 os_non_restarting_signal(SIGFPE
, SIG_DFL
);
3643 os_non_restarting_signal(SIGILL
, SIG_DFL
);
3644 os_non_restarting_signal(SIGBUS
, SIG_DFL
);
3646 /* The length check is paranoia against some runaway code, and also because
3647 (for a success return) lines in the spool file are read into big_buffer. */
3649 if (local_scan_data
!= NULL
)
3651 int len
= Ustrlen(local_scan_data
);
3652 if (len
> LOCAL_SCAN_MAX_RETURN
) len
= LOCAL_SCAN_MAX_RETURN
;
3653 local_scan_data
= string_copyn(local_scan_data
, len
);
3656 if (rc
== LOCAL_SCAN_ACCEPT_FREEZE
)
3658 if (!deliver_freeze
) /* ACL might have already frozen */
3660 deliver_freeze
= TRUE
;
3661 deliver_frozen_at
= time(NULL
);
3662 frozen_by
= US
"local_scan()";
3664 rc
= LOCAL_SCAN_ACCEPT
;
3666 else if (rc
== LOCAL_SCAN_ACCEPT_QUEUE
)
3668 if (!queue_only_policy
) /* ACL might have already queued */
3670 queue_only_policy
= TRUE
;
3671 queued_by
= US
"local_scan()";
3673 rc
= LOCAL_SCAN_ACCEPT
;
3676 /* Message accepted: remove newlines in local_scan_data because otherwise
3677 the spool file gets corrupted. Ensure that all recipients are qualified. */
3679 if (rc
== LOCAL_SCAN_ACCEPT
)
3681 if (local_scan_data
!= NULL
)
3684 for (s
= local_scan_data
; *s
!= 0; s
++) if (*s
== '\n') *s
= ' ';
3686 for (i
= 0; i
< recipients_count
; i
++)
3688 recipient_item
*r
= recipients_list
+ i
;
3689 r
->address
= rewrite_address_qualify(r
->address
, TRUE
);
3690 if (r
->errors_to
!= NULL
)
3691 r
->errors_to
= rewrite_address_qualify(r
->errors_to
, TRUE
);
3693 if (recipients_count
== 0 && blackholed_by
== NULL
)
3694 blackholed_by
= US
"local_scan";
3697 /* Message rejected: newlines permitted in local_scan_data to generate
3698 multiline SMTP responses. */
3702 uschar
*istemp
= US
"";
3708 errmsg
= local_scan_data
;
3710 Uunlink(spool_name
); /* Cancel this message */
3714 log_write(0, LOG_MAIN
, "invalid return %d from local_scan(). Temporary "
3715 "rejection given", rc
);
3718 case LOCAL_SCAN_REJECT_NOLOGHDR
:
3719 BIT_CLEAR(log_selector
, log_selector_size
, Li_rejected_header
);
3722 case LOCAL_SCAN_REJECT
:
3723 smtp_code
= US
"550";
3724 if (errmsg
== NULL
) errmsg
= US
"Administrative prohibition";
3727 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR
:
3728 BIT_CLEAR(log_selector
, log_selector_size
, Li_rejected_header
);
3731 case LOCAL_SCAN_TEMPREJECT
:
3733 smtp_code
= US
"451";
3734 if (errmsg
== NULL
) errmsg
= US
"Temporary local problem";
3735 istemp
= US
"temporarily ";
3739 s
= string_append(s
, &size
, &sptr
, 2, US
"F=",
3740 (sender_address
[0] == 0)? US
"<>" : sender_address
);
3741 s
= add_host_info_for_log(s
, &size
, &sptr
);
3744 log_write(0, LOG_MAIN
|LOG_REJECT
, "%s %srejected by local_scan(): %.256s",
3745 s
, istemp
, string_printing(errmsg
));
3749 if (!smtp_batched_input
)
3751 smtp_respond(smtp_code
, 3, TRUE
, errmsg
);
3752 message_id
[0] = 0; /* Indicate no message accepted */
3753 smtp_reply
= US
""; /* Indicate reply already sent */
3754 goto TIDYUP
; /* Skip to end of function */
3758 moan_smtp_batch(NULL
, "%s %s", smtp_code
, errmsg
);
3759 /* Does not return */
3764 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3765 give_local_error(ERRMESS_LOCAL_SCAN
, errmsg
,
3766 US
"message rejected by local scan code: ", error_rc
, data_file
,
3768 /* Does not return */
3772 /* Reset signal handlers to ignore signals that previously would have caused
3773 the message to be abandoned. */
3775 signal(SIGTERM
, SIG_IGN
);
3776 signal(SIGINT
, SIG_IGN
);
3779 /* Ensure the first time flag is set in the newly-received message. */
3781 deliver_firsttime
= TRUE
;
3783 #ifdef EXPERIMENTAL_BRIGHTMAIL
3785 { /* rewind data file */
3786 lseek(data_fd
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3787 bmi_verdicts
= bmi_process_message(header_list
, data_fd
);
3791 /* Update the timestamp in our Received: header to account for any time taken by
3792 an ACL or by local_scan(). The new time is the time that all reception
3793 processing is complete. */
3795 timestamp
= expand_string(US
"${tod_full}");
3796 tslen
= Ustrlen(timestamp
);
3798 memcpy(received_header
->text
+ received_header
->slen
- tslen
- 1,
3801 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3805 deliver_freeze
= FALSE
;
3806 queue_only_policy
= FALSE
;
3809 /* Keep the data file open until we have written the header file, in order to
3810 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3811 don't write the header file, and we unlink the data file. If writing the header
3812 file fails, we have failed to accept this message. */
3814 if (host_checking
|| blackholed_by
!= NULL
)
3817 Uunlink(spool_name
);
3818 msg_size
= 0; /* Compute size for log line */
3819 for (h
= header_list
; h
!= NULL
; h
= h
->next
)
3820 if (h
->type
!= '*') msg_size
+= h
->slen
;
3823 /* Write the -H file */
3826 if ((msg_size
= spool_write_header(message_id
, SW_RECEIVING
, &errmsg
)) < 0)
3828 log_write(0, LOG_MAIN
, "Message abandoned: %s", errmsg
);
3829 Uunlink(spool_name
); /* Lose the data file */
3833 smtp_reply
= US
"451 Error in writing spool file";
3834 message_id
[0] = 0; /* Indicate no message accepted */
3839 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3840 give_local_error(ERRMESS_IOERR
, errmsg
, US
"", error_rc
, data_file
,
3842 /* Does not return */
3847 /* The message has now been successfully received. */
3849 receive_messagecount
++;
3851 /* In SMTP sessions we may receive several in one connection. After each one,
3852 we wait for the clock to tick at the level of message-id granularity. This is
3853 so that the combination of time+pid is unique, even on systems where the pid
3854 can be re-used within our time interval. We can't shorten the interval without
3855 re-designing the message-id. See comments above where the message id is
3856 created. This is Something For The Future. */
3858 message_id_tv
.tv_usec
= (message_id_tv
.tv_usec
/id_resolution
) * id_resolution
;
3859 exim_wait_tick(&message_id_tv
, id_resolution
);
3861 /* Add data size to written header size. We do not count the initial file name
3862 that is in the file, but we do add one extra for the notional blank line that
3863 precedes the data. This total differs from message_size in that it include the
3864 added Received: header and any other headers that got created locally. */
3867 fstat(data_fd
, &statbuf
);
3869 msg_size
+= statbuf
.st_size
- SPOOL_DATA_START_OFFSET
+ 1;
3871 /* Generate a "message received" log entry. We do this by building up a dynamic
3872 string as required. Since we commonly want to add two items at a time, use a
3873 macro to simplify the coding. We log the arrival of a new message while the
3874 file is still locked, just in case the machine is *really* fast, and delivers
3875 it first! Include any message id that is in the message - since the syntax of a
3876 message id is actually an addr-spec, we can use the parse routine to canonicalize
3881 s
= store_get(size
);
3883 s
= string_append(s
, &size
, &sptr
, 2,
3884 fake_response
== FAIL
? US
"(= " : US
"<= ",
3885 sender_address
[0] == 0 ? US
"<>" : sender_address
);
3886 if (message_reference
)
3887 s
= string_append(s
, &size
, &sptr
, 2, US
" R=", message_reference
);
3889 s
= add_host_info_for_log(s
, &size
, &sptr
);
3892 if (LOGGING(tls_cipher
) && tls_in
.cipher
)
3893 s
= string_append(s
, &size
, &sptr
, 2, US
" X=", tls_in
.cipher
);
3894 if (LOGGING(tls_certificate_verified
) && tls_in
.cipher
)
3895 s
= string_append(s
, &size
, &sptr
, 2, US
" CV=",
3896 tls_in
.certificate_verified
? "yes":"no");
3897 if (LOGGING(tls_peerdn
) && tls_in
.peerdn
)
3898 s
= string_append(s
, &size
, &sptr
, 3, US
" DN=\"",
3899 string_printing(tls_in
.peerdn
), US
"\"");
3900 if (LOGGING(tls_sni
) && tls_in
.sni
)
3901 s
= string_append(s
, &size
, &sptr
, 3, US
" SNI=\"",
3902 string_printing(tls_in
.sni
), US
"\"");
3905 if (sender_host_authenticated
)
3907 s
= string_append(s
, &size
, &sptr
, 2, US
" A=", sender_host_authenticated
);
3908 if (authenticated_id
)
3910 s
= string_append(s
, &size
, &sptr
, 2, US
":", authenticated_id
);
3911 if (LOGGING(smtp_mailauth
) && authenticated_sender
)
3912 s
= string_append(s
, &size
, &sptr
, 2, US
":", authenticated_sender
);
3916 #ifndef DISABLE_PRDR
3918 s
= string_catn(s
, &size
, &sptr
, US
" PRDR", 5);
3921 #ifdef SUPPORT_PROXY
3922 if (proxy_session
&& LOGGING(proxy
))
3923 s
= string_append(s
, &size
, &sptr
, 2, US
" PRX=", proxy_local_address
);
3926 if (chunking_state
> CHUNKING_OFFERED
)
3927 s
= string_catn(s
, &size
, &sptr
, US
" K", 2);
3929 sprintf(CS big_buffer
, "%d", msg_size
);
3930 s
= string_append(s
, &size
, &sptr
, 2, US
" S=", big_buffer
);
3932 /* log 8BITMIME mode announced in MAIL_FROM
3936 if (LOGGING(8bitmime
))
3938 sprintf(CS big_buffer
, "%d", body_8bitmime
);
3939 s
= string_append(s
, &size
, &sptr
, 2, US
" M8S=", big_buffer
);
3943 s
= string_append(s
, &size
, &sptr
, 2, US
" Q=", queue_name
);
3945 /* If an addr-spec in a message-id contains a quoted string, it can contain
3946 any characters except " \ and CR and so in particular it can contain NL!
3947 Therefore, make sure we use a printing-characters only version for the log.
3948 Also, allow for domain literals in the message id. */
3953 BOOL save_allow_domain_literals
= allow_domain_literals
;
3954 allow_domain_literals
= TRUE
;
3955 old_id
= parse_extract_address(Ustrchr(msgid_header
->text
, ':') + 1,
3956 &errmsg
, &start
, &end
, &domain
, FALSE
);
3957 allow_domain_literals
= save_allow_domain_literals
;
3959 s
= string_append(s
, &size
, &sptr
, 2, US
" id=", string_printing(old_id
));
3962 /* If subject logging is turned on, create suitable printing-character
3963 text. By expanding $h_subject: we make use of the MIME decoding. */
3965 if (LOGGING(subject
) && subject_header
!= NULL
)
3968 uschar
*p
= big_buffer
;
3969 uschar
*ss
= expand_string(US
"$h_subject:");
3971 /* Backslash-quote any double quotes or backslashes so as to make a
3972 a C-like string, and turn any non-printers into escape sequences. */
3975 if (*ss
!= 0) for (i
= 0; i
< 100 && ss
[i
] != 0; i
++)
3977 if (ss
[i
] == '\"' || ss
[i
] == '\\') *p
++ = '\\';
3982 s
= string_append(s
, &size
, &sptr
, 2, US
" T=", string_printing(big_buffer
));
3985 /* Terminate the string: string_cat() and string_append() leave room, but do
3986 not put the zero in. */
3990 /* Create a message log file if message logs are being used and this message is
3991 not blackholed. Write the reception stuff to it. We used to leave message log
3992 creation until the first delivery, but this has proved confusing for some
3995 if (message_logs
&& blackholed_by
== NULL
)
3999 spool_name
= spool_fname(US
"msglog", message_subdir
, message_id
, US
"");
4001 if ( (fd
= Uopen(spool_name
, O_WRONLY
|O_APPEND
|O_CREAT
, SPOOL_MODE
)) < 0
4005 (void)directory_make(spool_directory
,
4006 spool_sname(US
"msglog", message_subdir
),
4007 MSGLOG_DIRECTORY_MODE
, TRUE
);
4008 fd
= Uopen(spool_name
, O_WRONLY
|O_APPEND
|O_CREAT
, SPOOL_MODE
);
4013 log_write(0, LOG_MAIN
|LOG_PANIC
, "Couldn't open message log %s: %s",
4014 spool_name
, strerror(errno
));
4019 FILE *message_log
= fdopen(fd
, "a");
4020 if (message_log
== NULL
)
4022 log_write(0, LOG_MAIN
|LOG_PANIC
, "Couldn't fdopen message log %s: %s",
4023 spool_name
, strerror(errno
));
4028 uschar
*now
= tod_stamp(tod_log
);
4029 fprintf(message_log
, "%s Received from %s\n", now
, s
+3);
4030 if (deliver_freeze
) fprintf(message_log
, "%s frozen by %s\n", now
,
4032 if (queue_only_policy
) fprintf(message_log
,
4033 "%s no immediate delivery: queued%s%s by %s\n", now
,
4034 *queue_name
? " in " : "", *queue_name
? CS queue_name
: "",
4036 (void)fclose(message_log
);
4041 /* Everything has now been done for a successful message except logging its
4042 arrival, and outputting an SMTP response. While writing to the log, set a flag
4043 to cause a call to receive_bomb_out() if the log cannot be opened. */
4045 receive_call_bombout
= TRUE
;
4047 /* Before sending an SMTP response in a TCP/IP session, we check to see if the
4048 connection has gone away. This can only be done if there is no unconsumed input
4049 waiting in the local input buffer. We can test for this by calling
4050 receive_smtp_buffered(). RFC 2920 (pipelining) explicitly allows for additional
4051 input to be sent following the final dot, so the presence of following input is
4054 If the connection is still present, but there is no unread input for the
4055 socket, the result of a select() call will be zero. If, however, the connection
4056 has gone away, or if there is pending input, the result of select() will be
4057 non-zero. The two cases can be distinguished by trying to read the next input
4058 character. If we succeed, we can unread it so that it remains in the local
4059 buffer for handling later. If not, the connection has been lost.
4061 Of course, since TCP/IP is asynchronous, there is always a chance that the
4062 connection will vanish between the time of this test and the sending of the
4063 response, but the chance of this happening should be small. */
4065 if (smtp_input
&& sender_host_address
!= NULL
&& !sender_host_notsocket
&&
4066 !receive_smtp_buffered())
4069 fd_set select_check
;
4070 FD_ZERO(&select_check
);
4071 FD_SET(fileno(smtp_in
), &select_check
);
4075 if (select(fileno(smtp_in
) + 1, &select_check
, NULL
, NULL
, &tv
) != 0)
4077 int c
= (receive_getc
)(GETC_BUFFER_UNLIMITED
);
4078 if (c
!= EOF
) (receive_ungetc
)(c
); else
4080 smtp_notquit_exit(US
"connection-lost", NULL
, NULL
);
4081 smtp_reply
= US
""; /* No attempt to send a response */
4082 smtp_yield
= FALSE
; /* Nothing more on this connection */
4084 /* Re-use the log line workspace */
4087 s
= string_cat(s
, &size
, &sptr
, US
"SMTP connection lost after final dot");
4088 s
= add_host_info_for_log(s
, &size
, &sptr
);
4090 log_write(0, LOG_MAIN
, "%s", s
);
4092 /* Delete the files for this aborted message. */
4094 Uunlink(spool_fname(US
"input", message_subdir
, message_id
, US
"-D"));
4095 Uunlink(spool_fname(US
"input", message_subdir
, message_id
, US
"-H"));
4096 Uunlink(spool_fname(US
"msglog", message_subdir
, message_id
, US
""));
4103 /* The connection has not gone away; we really are going to take responsibility
4104 for this message. */
4106 /* Cutthrough - had sender last-dot; assume we've sent (or bufferred) all
4109 Send dot onward. If accepted, wipe the spooled files, log as delivered and accept
4110 the sender's dot (below).
4111 If rejected: copy response to sender, wipe the spooled files, log appropriately.
4112 If temp-reject: normally accept to sender, keep the spooled file - unless defer=pass
4113 in which case pass temp-reject back to initiator and dump the files.
4115 Having the normal spool files lets us do data-filtering, and store/forward on temp-reject.
4117 XXX We do not handle queue-only, freezing, or blackholes.
4119 if(cutthrough
.fd
>= 0)
4121 uschar
* msg
= cutthrough_finaldot(); /* Ask the target system to accept the message */
4122 /* Logging was done in finaldot() */
4125 case '2': /* Accept. Do the same to the source; dump any spoolfiles. */
4126 cutthrough_done
= ACCEPTED
;
4127 break; /* message_id needed for SMTP accept below */
4129 case '4': /* Temp-reject. Keep spoolfiles and accept, unless defer-pass mode.
4130 ... for which, pass back the exact error */
4131 if (cutthrough
.defer_pass
) smtp_reply
= string_copy_malloc(msg
);
4134 default: /* Unknown response, or error. Treat as temp-reject. */
4135 cutthrough_done
= TMP_REJ
; /* Avoid the usual immediate delivery attempt */
4136 break; /* message_id needed for SMTP accept below */
4138 case '5': /* Perm-reject. Do the same to the source. Dump any spoolfiles */
4139 smtp_reply
= string_copy_malloc(msg
); /* Pass on the exact error */
4140 cutthrough_done
= PERM_REJ
;
4145 #ifndef DISABLE_PRDR
4146 if(!smtp_reply
|| prdr_requested
)
4151 log_write(0, LOG_MAIN
|
4152 (LOGGING(received_recipients
)? LOG_RECIPIENTS
: 0) |
4153 (LOGGING(received_sender
)? LOG_SENDER
: 0),
4156 /* Log any control actions taken by an ACL or local_scan(). */
4158 if (deliver_freeze
) log_write(0, LOG_MAIN
, "frozen by %s", frozen_by
);
4159 if (queue_only_policy
) log_write(L_delay_delivery
, LOG_MAIN
,
4160 "no immediate delivery: queued%s%s by %s",
4161 *queue_name
? " in " : "", *queue_name
? CS queue_name
: "",
4164 receive_call_bombout
= FALSE
;
4166 store_reset(s
); /* The store for the main log message can be reused */
4168 /* If the message is frozen, and freeze_tell is set, do the telling. */
4170 if (deliver_freeze
&& freeze_tell
!= NULL
&& freeze_tell
[0] != 0)
4172 moan_tell_someone(freeze_tell
, NULL
, US
"Message frozen on arrival",
4173 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
4174 message_id
, frozen_by
, sender_address
);
4178 /* Either a message has been successfully received and written to the two spool
4179 files, or an error in writing the spool has occurred for an SMTP message, or
4180 an SMTP message has been rejected for policy reasons. (For a non-SMTP message
4181 we will have already given up because there's no point in carrying on!) In
4182 either event, we must now close (and thereby unlock) the data file. In the
4183 successful case, this leaves the message on the spool, ready for delivery. In
4184 the error case, the spool file will be deleted. Then tidy up store, interact
4185 with an SMTP call if necessary, and return.
4187 A fflush() was done earlier in the expectation that any write errors on the
4188 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
4189 possible for fclose() to fail - but what to do? What has happened to the lock
4194 process_info
[process_info_len
] = 0; /* Remove message id */
4195 if (data_file
!= NULL
) (void)fclose(data_file
); /* Frees the lock */
4197 /* Now reset signal handlers to their defaults */
4199 signal(SIGTERM
, SIG_DFL
);
4200 signal(SIGINT
, SIG_DFL
);
4202 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
4203 value, which defaults TRUE - meaning there may be more incoming messages from
4204 this connection. For non-SMTP callers (where there is only ever one message),
4205 the default is FALSE. */
4211 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
4212 is set to the response that should be sent. When it is NULL, we generate
4213 default responses. After an ACL error or local_scan() error, the response has
4214 already been sent, and smtp_reply is an empty string to indicate this. */
4216 if (!smtp_batched_input
)
4220 if (fake_response
!= OK
)
4221 smtp_respond(fake_response
== DEFER
? US
"450" : US
"550",
4222 3, TRUE
, fake_response_text
);
4224 /* An OK response is required; use "message" text if present. */
4228 uschar
*code
= US
"250";
4230 smtp_message_code(&code
, &len
, &user_msg
, NULL
, TRUE
);
4231 smtp_respond(code
, len
, TRUE
, user_msg
);
4234 /* Default OK response */
4236 else if (chunking_state
> CHUNKING_OFFERED
)
4238 smtp_printf("250- %u byte chunk, total %d\r\n250 OK id=%s\r\n",
4239 chunking_datasize
, message_size
+message_linecount
, message_id
);
4240 chunking_state
= CHUNKING_OFFERED
;
4243 smtp_printf("250 OK id=%s\r\n", message_id
);
4247 "\n**** SMTP testing: that is not a real message id!\n\n");
4250 /* smtp_reply is set non-empty */
4252 else if (smtp_reply
[0] != 0)
4253 if (fake_response
!= OK
&& (smtp_reply
[0] == '2'))
4254 smtp_respond((fake_response
== DEFER
)? US
"450" : US
"550", 3, TRUE
,
4255 fake_response_text
);
4257 smtp_printf("%.1024s\r\n", smtp_reply
);
4259 switch (cutthrough_done
)
4262 log_write(0, LOG_MAIN
, "Completed");/* Delivery was done */
4264 /* Delete spool files */
4265 Uunlink(spool_fname(US
"input", message_subdir
, message_id
, US
"-D"));
4266 Uunlink(spool_fname(US
"input", message_subdir
, message_id
, US
"-H"));
4267 Uunlink(spool_fname(US
"msglog", message_subdir
, message_id
, US
""));
4268 message_id
[0] = 0; /* Prevent a delivery from starting */
4272 if (cutthrough
.defer_pass
)
4274 Uunlink(spool_fname(US
"input", message_subdir
, message_id
, US
"-D"));
4275 Uunlink(spool_fname(US
"input", message_subdir
, message_id
, US
"-H"));
4276 Uunlink(spool_fname(US
"msglog", message_subdir
, message_id
, US
""));
4278 message_id
[0] = 0; /* Prevent a delivery from starting */
4282 cutthrough
.delivery
= FALSE
;
4283 cutthrough
.defer_pass
= FALSE
;
4286 /* For batched SMTP, generate an error message on failure, and do
4287 nothing on success. The function moan_smtp_batch() does not return -
4288 it exits from the program with a non-zero return code. */
4290 else if (smtp_reply
)
4291 moan_smtp_batch(NULL
, "%s", smtp_reply
);
4295 /* If blackholing, we can immediately log this message's sad fate. The data
4296 file has already been unlinked, and the header file was never written to disk.
4297 We must now indicate that nothing was received, to prevent a delivery from
4302 const uschar
*detail
= local_scan_data
4303 ? string_printing(local_scan_data
)
4304 : string_sprintf("(%s discarded recipients)", blackholed_by
);
4305 log_write(0, LOG_MAIN
, "=> blackhole %s%s", detail
, blackhole_log_msg
);
4306 log_write(0, LOG_MAIN
, "Completed");
4310 /* Reset headers so that logging of rejects for a subsequent message doesn't
4311 include them. It is also important to set header_last = NULL before exiting
4312 from this function, as this prevents certain rewrites that might happen during
4313 subsequent verifying (of another incoming message) from trying to add headers
4314 when they shouldn't. */
4316 header_list
= header_last
= NULL
;
4318 return yield
; /* TRUE if more messages (SMTP only) */
4321 /* End of receive.c */