1 /* $Cambridge: exim/src/src/receive.c,v 1.13 2005/04/04 10:33:49 ph10 Exp $ */
3 /*************************************************
4 * Exim - an Internet mail transport agent *
5 *************************************************/
7 /* Copyright (c) University of Cambridge 1995 - 2005 */
8 /* See the file NOTICE for conditions of use and distribution. */
10 /* Code for receiving a message and setting up spool files. */
14 #ifdef EXPERIMENTAL_DOMAINKEYS
15 #define RECEIVE_GETC dk_receive_getc
16 #define RECEIVE_UNGETC dk_receive_ungetc
18 #define RECEIVE_GETC receive_getc
19 #define RECEIVE_UNGETC receive_ungetc
22 /*************************************************
23 * Local static variables *
24 *************************************************/
26 static FILE *data_file
= NULL
;
27 static int data_fd
= -1;
28 static uschar spool_name
[256];
32 /*************************************************
33 * Non-SMTP character reading functions *
34 *************************************************/
36 /* These are the default functions that are set up in the variables such as
37 receive_getc initially. They just call the standard functions, passing stdin as
38 the file. (When SMTP input is occurring, different functions are used by
39 changing the pointer variables.) */
50 return ungetc(c
, stdin
);
68 /*************************************************
69 * Check that a set sender is allowed *
70 *************************************************/
72 /* This function is called when a local caller sets an explicit sender address.
73 It checks whether this is permitted, which it is for trusted callers.
74 Otherwise, it must match the pattern(s) in untrusted_set_sender.
76 Arguments: the proposed sender address
77 Returns: TRUE for a trusted caller
78 TRUE if the address has been set, untrusted_set_sender has been
79 set, and the address matches something in the list
84 receive_check_set_sender(uschar
*newsender
)
87 if (trusted_caller
) return TRUE
;
88 if (newsender
== NULL
|| untrusted_set_sender
== NULL
) return FALSE
;
89 qnewsender
= (Ustrchr(newsender
, '@') != NULL
)?
90 newsender
: string_sprintf("%s@%s", newsender
, qualify_domain_sender
);
92 match_address_list(qnewsender
, TRUE
, TRUE
, &untrusted_set_sender
, NULL
, -1,
99 /*************************************************
100 * Read space info for a partition *
101 *************************************************/
103 /* This function is called by receive_check_fs() below, and also by string
104 expansion for variables such as $spool_space. The field names for the statvfs
105 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
106 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
107 have inodes, and they return -1 for the number available.
109 Later: It turns out that some file systems that do not have the concept of
110 inodes return 0 rather than -1. Such systems should also return 0 for the total
111 number of inodes, so we require that to be greater than zero before returning
115 isspool TRUE for spool partition, FALSE for log partition
116 inodeptr address of int to receive inode count; -1 if there isn't one
118 Returns: available on-root space, in kilobytes
119 -1 for log partition if there isn't one
121 All values are -1 if the STATFS functions are not available.
125 receive_statvfs(BOOL isspool
, int *inodeptr
)
128 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 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
))) != NULL
)
156 if (Ustrcmp(path
, "syslog") != 0) break;
159 if (path
== NULL
) /* No log files */
165 /* An empty string means use the default, which is in the spool directory.
166 But don't just use the spool directory, as it is possible that the log
167 subdirectory has been symbolically linked elsewhere. */
171 sprintf(CS buffer
, CS
"%s/log", CS spool_directory
);
177 if ((cp
= Ustrrchr(path
, '/')) != NULL
) *cp
= 0;
181 /* We now have the patch; do the business */
183 memset(&statbuf
, 0, sizeof(statbuf
));
185 if (STATVFS(CS path
, &statbuf
) != 0)
187 log_write(0, LOG_MAIN
|LOG_PANIC
, "cannot accept message: failed to stat "
188 "%s directory %s: %s", name
, spool_directory
, strerror(errno
));
189 smtp_closedown(US
"spool or log directory problem");
190 exim_exit(EXIT_FAILURE
);
193 *inodeptr
= (statbuf
.F_FILES
> 0)? statbuf
.F_FAVAIL
: -1;
195 /* Disks are getting huge. Take care with computing the size in kilobytes. */
197 return (int)(((double)statbuf
.F_BAVAIL
* (double)statbuf
.F_FRSIZE
)/1024.0);
199 /* Unable to find partition sizes in this environment. */
210 /*************************************************
211 * Check space on spool and log partitions *
212 *************************************************/
214 /* This function is called before accepting a message; if any thresholds are
215 set, it checks them. If a message_size is supplied, it checks that there is
216 enough space for that size plus the threshold - i.e. that the message won't
217 reduce the space to the threshold. Not all OS have statvfs(); for those that
218 don't, this function always returns TRUE. For some OS the old function and
219 struct name statfs is used; that is handled by a macro, defined in exim.h.
222 msg_size the (estimated) size of an incoming message
224 Returns: FALSE if there isn't enough space, or if the information cannot
226 TRUE if no check was done or there is enough space
230 receive_check_fs(int msg_size
)
234 if (check_spool_space
> 0 || msg_size
> 0 || check_spool_inodes
> 0)
236 space
= receive_statvfs(TRUE
, &inodes
);
239 debug_printf("spool directory space = %dK inodes = %d "
240 "check_space = %dK inodes = %d msg_size = %d\n",
241 space
, inodes
, check_spool_space
, check_spool_inodes
, msg_size
);
243 if ((space
>= 0 && space
< check_spool_space
) ||
244 (inodes
>= 0 && inodes
< check_spool_inodes
))
246 log_write(0, LOG_MAIN
, "spool directory space check failed: space=%d "
247 "inodes=%d", space
, inodes
);
252 if (check_log_space
> 0 || check_log_inodes
> 0)
254 space
= receive_statvfs(FALSE
, &inodes
);
257 debug_printf("log directory space = %dK inodes = %d "
258 "check_space = %dK inodes = %d\n",
259 space
, inodes
, check_log_space
, check_log_inodes
);
261 if ((space
>= 0 && space
< check_log_space
) ||
262 (inodes
>= 0 && inodes
< check_log_inodes
))
264 log_write(0, LOG_MAIN
, "log directory space check failed: space=%d "
265 "inodes=%d", space
, inodes
);
275 /*************************************************
276 * Bomb out while reading a message *
277 *************************************************/
279 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
280 received, or if there is a timeout. A rarer case might be if the log files are
281 screwed up and Exim can't open them to record a message's arrival. Handling
282 that case is done by setting a flag to cause the log functions to call this
283 function if there is an ultimate disaster. That is why it is globally
286 Arguments: SMTP response to give if in an SMTP session
291 receive_bomb_out(uschar
*msg
)
293 /* If spool_name is set, it contains the name of the data file that is being
294 written. Unlink it before closing so that it cannot be picked up by a delivery
295 process. Ensure that any header file is also removed. */
297 if (spool_name
[0] != 0)
300 spool_name
[Ustrlen(spool_name
) - 1] = 'H';
304 /* Now close the file if it is open, either as a fd or a stream. */
306 if (data_file
!= NULL
) fclose(data_file
);
307 else if (data_fd
>= 0) close(data_fd
);
309 /* Attempt to close down an SMTP connection tidily. */
313 if (!smtp_batched_input
)
315 smtp_printf("421 %s %s - closing connection.\r\n", smtp_active_hostname
,
320 /* Control does not return from moan_smtp_batch(). */
322 else moan_smtp_batch(NULL
, "421 %s - message abandoned", msg
);
325 /* Exit from the program (non-BSMTP cases) */
327 exim_exit(EXIT_FAILURE
);
331 /*************************************************
332 * Data read timeout *
333 *************************************************/
335 /* Handler function for timeouts that occur while reading the data that
338 Argument: the signal number
343 data_timeout_handler(int sig
)
347 sig
= sig
; /* Keep picky compilers happy */
351 msg
= US
"SMTP incoming data timeout";
352 log_write(L_lost_incoming_connection
,
353 LOG_MAIN
, "SMTP data timeout (message abandoned) on connection "
355 (sender_fullhost
!= NULL
)? sender_fullhost
: US
"local process");
359 fprintf(stderr
, "exim: timed out while reading - message abandoned\n");
360 log_write(L_lost_incoming_connection
,
361 LOG_MAIN
, "timed out while reading local message");
364 receive_bomb_out(msg
); /* Does not return */
369 /*************************************************
370 * local_scan() timeout *
371 *************************************************/
373 /* Handler function for timeouts that occur while running a local_scan()
376 Argument: the signal number
381 local_scan_timeout_handler(int sig
)
383 sig
= sig
; /* Keep picky compilers happy */
384 log_write(0, LOG_MAIN
|LOG_REJECT
, "local_scan() function timed out - "
385 "message temporarily rejected (size %d)", message_size
);
386 receive_bomb_out(US
"local verification problem"); /* Does not return */
391 /*************************************************
392 * local_scan() crashed *
393 *************************************************/
395 /* Handler function for signals that occur while running a local_scan()
398 Argument: the signal number
403 local_scan_crash_handler(int sig
)
405 log_write(0, LOG_MAIN
|LOG_REJECT
, "local_scan() function crashed with "
406 "signal %d - message temporarily rejected (size %d)", sig
, message_size
);
407 receive_bomb_out(US
"local verification problem"); /* Does not return */
411 /*************************************************
412 * SIGTERM or SIGINT received *
413 *************************************************/
415 /* Handler for SIGTERM or SIGINT signals that occur while reading the
416 data that comprises a message.
418 Argument: the signal number
423 data_sigterm_sigint_handler(int sig
)
429 msg
= US
"Service not available - SIGTERM or SIGINT received";
430 log_write(0, LOG_MAIN
, "%s closed after %s", smtp_get_connection_info(),
431 (sig
== SIGTERM
)? "SIGTERM" : "SIGINT");
435 if (filter_test
== FTEST_NONE
)
437 fprintf(stderr
, "\nexim: %s received - message abandoned\n",
438 (sig
== SIGTERM
)? "SIGTERM" : "SIGINT");
439 log_write(0, LOG_MAIN
, "%s received while reading local message",
440 (sig
== SIGTERM
)? "SIGTERM" : "SIGINT");
444 receive_bomb_out(msg
); /* Does not return */
449 /*************************************************
450 * Add new recipient to list *
451 *************************************************/
453 /* This function builds a list of recipient addresses in argc/argv
457 recipient the next address to add to recipients_list
458 pno parent number for fixed aliases; -1 otherwise
464 receive_add_recipient(uschar
*recipient
, int pno
)
466 if (recipients_count
>= recipients_list_max
)
468 recipient_item
*oldlist
= recipients_list
;
469 int oldmax
= recipients_list_max
;
470 recipients_list_max
= recipients_list_max
? 2*recipients_list_max
: 50;
471 recipients_list
= store_get(recipients_list_max
* sizeof(recipient_item
));
473 memcpy(recipients_list
, oldlist
, oldmax
* sizeof(recipient_item
));
476 recipients_list
[recipients_count
].address
= recipient
;
477 recipients_list
[recipients_count
].pno
= pno
;
478 #ifdef EXPERIMENTAL_BRIGHTMAIL
479 recipients_list
[recipients_count
].bmi_optin
= bmi_current_optin
;
480 /* reset optin string pointer for next recipient */
481 bmi_current_optin
= NULL
;
483 recipients_list
[recipients_count
++].errors_to
= NULL
;
489 /*************************************************
490 * Remove a recipient from the list *
491 *************************************************/
493 /* This function is provided for local_scan() to use.
496 recipient address to remove
498 Returns: TRUE if it did remove something; FALSE otherwise
502 receive_remove_recipient(uschar
*recipient
)
505 DEBUG(D_receive
) debug_printf("receive_remove_recipient(\"%s\") called\n",
507 for (count
= 0; count
< recipients_count
; count
++)
509 if (Ustrcmp(recipients_list
[count
].address
, recipient
) == 0)
511 if ((--recipients_count
- count
) > 0)
512 memmove(recipients_list
+ count
, recipients_list
+ count
+ 1,
513 (recipients_count
- count
)*sizeof(recipient_item
));
524 /*************************************************
525 * Read data portion of a non-SMTP message *
526 *************************************************/
528 /* This function is called to read the remainder of a message (following the
529 header) when the input is not from SMTP - we are receiving a local message on
530 a standard input stream. The message is always terminated by EOF, and is also
531 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
532 two cases for maximum efficiency.
534 Ensure that the body ends with a newline. This will naturally be the case when
535 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
536 as "sequences of lines" - this of course strictly applies only to SMTP, but
537 deliveries into BSD-type mailbox files also require it. Exim used to have a
538 flag for doing this at delivery time, but as it was always set for all
539 transports, I decided to simplify things by putting the check here instead.
541 There is at least one MUA (dtmail) that sends CRLF via this interface, and
542 other programs are known to do this as well. Exim used to have a option for
543 dealing with this: in July 2003, after much discussion, the code has been
544 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
546 However, for the case when a dot on a line by itself terminates a message, the
547 only recognized terminating sequences before and after the dot are LF and CRLF.
548 Otherwise, having read EOL . CR, you don't know whether to read another
551 Internally, in messages stored in Exim's spool files, LF is used as the line
552 terminator. Under the new regime, bare CRs will no longer appear in these
556 fout a FILE to which to write the message
558 Returns: One of the END_xxx values indicating why it stopped reading
562 read_message_data(FILE *fout
)
567 /* Handle the case when only EOF terminates the message */
571 register int last_ch
= '\n';
573 for (; (ch
= (RECEIVE_GETC
)()) != EOF
; last_ch
= ch
)
575 if (ch
== 0) body_zerocount
++;
576 if (last_ch
== '\r' && ch
!= '\n')
578 if (fputc('\n', fout
) == EOF
) return END_WERROR
;
582 if (ch
== '\r') continue;
584 if (fputc(ch
, fout
) == EOF
) return END_WERROR
;
585 if (ch
== '\n') body_linecount
++;
586 if (++message_size
> thismessage_size_limit
) return END_SIZE
;
591 if (fputc('\n', fout
) == EOF
) return END_WERROR
;
599 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
603 while ((ch
= (RECEIVE_GETC
)()) != EOF
)
605 if (ch
== 0) body_zerocount
++;
608 case 0: /* Normal state (previous char written) */
610 { body_linecount
++; ch_state
= 1; }
612 { ch_state
= 2; continue; }
615 case 1: /* After written "\n" */
616 if (ch
== '.') { ch_state
= 3; continue; }
617 if (ch
!= '\n') ch_state
= 0;
621 body_linecount
++; /* After unwritten "\r" */
626 if (message_size
++, fputc('\n', fout
) == EOF
) return END_WERROR
;
627 if (ch
== '\r') continue;
632 case 3: /* After "\n." (\n written, dot not) */
633 if (ch
== '\n') return END_DOT
;
634 if (ch
== '\r') { ch_state
= 4; continue; }
636 if (fputc('.', fout
) == EOF
) return END_WERROR
;
640 case 4: /* After "\n.\r" (\n written, rest not) */
641 if (ch
== '\n') return END_DOT
;
644 if (fputs(".\n", fout
) == EOF
) return END_WERROR
;
645 if (ch
== '\r') { ch_state
= 2; continue; }
650 if (fputc(ch
, fout
) == EOF
) return END_WERROR
;
651 if (++message_size
> thismessage_size_limit
) return END_SIZE
;
654 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
655 the message ends with a newline, and we must also write any characters that
656 were saved up while testing for an ending dot. */
660 static uschar
*ends
[] = { US
"\n", NULL
, US
"\n", US
".\n", US
".\n" };
661 if (fputs(CS ends
[ch_state
], fout
) == EOF
) return END_WERROR
;
662 message_size
+= Ustrlen(ends
[ch_state
]);
672 /*************************************************
673 * Read data portion of an SMTP message *
674 *************************************************/
676 /* This function is called to read the remainder of an SMTP message (after the
677 headers), or to skip over it when an error has occurred. In this case, the
678 output file is passed as NULL.
680 If any line begins with a dot, that character is skipped. The input should only
681 be successfully terminated by CR LF . CR LF unless it is local (non-network)
682 SMTP, in which case the CRs are optional, but...
684 FUDGE: It seems that sites on the net send out messages with just LF
685 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
686 we make the CRs optional in all cases.
688 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
689 well, so that there are no CRs in spooled messages. However, the message
690 terminating dot is not recognized between two bare CRs.
693 fout a FILE to which to write the message; NULL if skipping
695 Returns: One of the END_xxx values indicating why it stopped reading
699 read_message_data_smtp(FILE *fout
)
704 while ((ch
= (RECEIVE_GETC
)()) != EOF
)
706 if (ch
== 0) body_zerocount
++;
709 case 0: /* After LF or CRLF */
713 continue; /* Don't ever write . after LF */
717 /* Else fall through to handle as normal uschar. */
719 case 1: /* Normal state */
732 case 2: /* After (unwritten) CR */
741 if (fout
!= NULL
&& fputc('\n', fout
) == EOF
) return END_WERROR
;
742 if (ch
!= '\r') ch_state
= 1; else continue;
746 case 3: /* After [CR] LF . */
754 ch_state
= 1; /* The dot itself is removed */
757 case 4: /* After [CR] LF . CR */
758 if (ch
== '\n') return END_DOT
;
761 if (fout
!= NULL
&& fputc('\n', fout
) == EOF
) return END_WERROR
;
771 /* Add the character to the spool file, unless skipping; then loop for the
777 if (fputc(ch
, fout
) == EOF
) return END_WERROR
;
778 if (message_size
> thismessage_size_limit
) return END_SIZE
;
782 /* Fall through here if EOF encountered. This indicates some kind of error,
783 since a correct message is terminated by [CR] LF . [CR] LF. */
791 /*************************************************
792 * Swallow SMTP message *
793 *************************************************/
795 /* This function is called when there has been some kind of error while reading
796 an SMTP message, and the remaining data may need to be swallowed. It is global
797 because it is called from smtp_closedown() to shut down an incoming call
800 Argument: a FILE from which to read the message
805 receive_swallow_smtp(void)
807 if (message_ended
>= END_NOTENDED
)
808 message_ended
= read_message_data_smtp(NULL
);
813 /*************************************************
814 * Handle lost SMTP connection *
815 *************************************************/
817 /* This function logs connection loss incidents and generates an appropriate
820 Argument: additional data for the message
821 Returns: the SMTP response
825 handle_lost_connection(uschar
*s
)
827 log_write(L_lost_incoming_connection
| L_smtp_connection
, LOG_MAIN
,
828 "%s lost while reading message data%s", smtp_get_connection_info(), s
);
829 return US
"421 Lost incoming connection";
835 /*************************************************
836 * Handle a non-smtp reception error *
837 *************************************************/
839 /* This function is called for various errors during the reception of non-SMTP
840 messages. It either sends a message to the sender of the problem message, or it
841 writes to the standard error stream.
844 errcode code for moan_to_sender(), identifying the error
845 text1 first message text, passed to moan_to_sender()
846 text2 second message text, used only for stderrr
847 error_rc code to pass to exim_exit if no problem
848 f FILE containing body of message (may be stdin)
849 hptr pointer to instore headers or NULL
851 Returns: calls exim_exit(), which does not return
855 give_local_error(int errcode
, uschar
*text1
, uschar
*text2
, int error_rc
,
856 FILE *f
, header_line
*hptr
)
858 if (error_handling
== ERRORS_SENDER
)
862 eblock
.text1
= text1
;
863 if (!moan_to_sender(errcode
, &eblock
, hptr
, f
, FALSE
))
864 error_rc
= EXIT_FAILURE
;
866 else fprintf(stderr
, "exim: %s%s\n", text2
, text1
); /* Sic */
873 /*************************************************
874 * Add header lines set up by ACL *
875 *************************************************/
877 /* This function is called to add the header lines that were set up by "warn"
878 statements in an ACL onto the list of headers in memory. It is done in two
879 stages like this, because when the ACL for RCPT is running, the other headers
880 have not yet been received. This function is called twice; once just before
881 running the DATA ACL, and once after. This is so that header lines added by
882 MAIL or RCPT are visible to the DATA ACL.
884 Originally these header lines were added at the end. Now there is support for
885 three different places: top, bottom, and after the Received: header(s). There
886 will always be at least one Received: header, even if it is marked deleted, and
887 even if something else has been put in front of it.
890 acl_name text to identify which ACL
896 add_acl_headers(uschar
*acl_name
)
898 header_line
*h
, *next
;
899 header_line
*last_received
= NULL
;
901 if (acl_warn_headers
== NULL
) return;
902 DEBUG(D_receive
|D_acl
) debug_printf(">>Headers added by %s ACL:\n", acl_name
);
904 for (h
= acl_warn_headers
; h
!= NULL
; h
= next
)
911 h
->next
= header_list
;
913 DEBUG(D_receive
|D_acl
) debug_printf(" (at top)");
917 if (last_received
== NULL
)
919 last_received
= header_list
;
920 while (!header_testname(last_received
, US
"Received", 8, FALSE
))
921 last_received
= last_received
->next
;
922 while (last_received
->next
!= NULL
&&
923 header_testname(last_received
->next
, US
"Received", 8, FALSE
))
924 last_received
= last_received
->next
;
926 h
->next
= last_received
->next
;
927 last_received
->next
= h
;
928 DEBUG(D_receive
|D_acl
) debug_printf(" (after Received:)");
932 /* add header before any header which is NOT Received: or Resent- */
933 last_received
= header_list
;
934 while ( (last_received
->next
!= NULL
) &&
935 ( (header_testname(last_received
->next
, US
"Received", 8, FALSE
)) ||
936 (header_testname_incomplete(last_received
->next
, US
"Resent-", 7, FALSE
)) ) )
937 last_received
= last_received
->next
;
938 /* last_received now points to the last Received: or Resent-* header
939 in an uninterrupted chain of those header types (seen from the beginning
940 of all headers. Our current header must follow it. */
941 h
->next
= last_received
->next
;
942 last_received
->next
= h
;
943 DEBUG(D_receive
|D_acl
) debug_printf(" (before any non-Received: or Resent-*: header)");
948 header_last
->next
= h
;
952 if (h
->next
== NULL
) header_last
= h
;
954 /* Check for one of the known header types (From:, To:, etc.) though in
955 practice most added headers are going to be "other". Lower case
956 identification letters are never stored with the header; they are used
957 for existence tests when messages are received. So discard any lower case
960 h
->type
= header_checkname(h
, FALSE
);
961 if (h
->type
>= 'a') h
->type
= htype_other
;
963 DEBUG(D_receive
|D_acl
) debug_printf(" %s", header_last
->text
);
966 acl_warn_headers
= NULL
;
967 DEBUG(D_receive
|D_acl
) debug_printf(">>\n");
972 /*************************************************
973 * Add host information for log line *
974 *************************************************/
976 /* Called for acceptance and rejecting log lines. This adds information about
977 the calling host to a string that is being built dynamically.
981 sizeptr points to the size variable
982 ptrptr points to the pointer variable
984 Returns: the extended string
988 add_host_info_for_log(uschar
*s
, int *sizeptr
, int *ptrptr
)
990 if (sender_fullhost
!= NULL
)
992 s
= string_append(s
, sizeptr
, ptrptr
, 2, US
" H=", sender_fullhost
);
993 if ((log_extra_selector
& LX_incoming_interface
) != 0 &&
994 interface_address
!= NULL
)
996 uschar
*ss
= string_sprintf(" I=[%s]:%d", interface_address
,
998 s
= string_cat(s
, sizeptr
, ptrptr
, ss
, Ustrlen(ss
));
1001 if (sender_ident
!= NULL
)
1002 s
= string_append(s
, sizeptr
, ptrptr
, 2, US
" U=", sender_ident
);
1003 if (received_protocol
!= NULL
)
1004 s
= string_append(s
, sizeptr
, ptrptr
, 2, US
" P=", received_protocol
);
1011 /*************************************************
1012 * Run the MIME ACL on a message *
1013 *************************************************/
1015 /* This code is in a subroutine so that it can be used for both SMTP
1016 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1019 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1020 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1021 smtp_reply_ptr Where SMTP reply is being built
1022 blackholed_by_ptr Where "blackholed by" message is being built
1024 Returns: TRUE to carry on; FALSE to abandon the message
1028 run_mime_acl(uschar
*acl
, BOOL
*smtp_yield_ptr
, uschar
**smtp_reply_ptr
,
1029 uschar
**blackholed_by_ptr
)
1032 uschar rfc822_file_path
[2048];
1033 unsigned long mbox_size
;
1034 header_line
*my_headerlist
;
1035 uschar
*user_msg
, *log_msg
;
1036 int mime_part_count_buffer
= -1;
1039 memset(CS rfc822_file_path
,0,2048);
1041 /* check if it is a MIME message */
1042 my_headerlist
= header_list
;
1043 while (my_headerlist
!= NULL
) {
1044 /* skip deleted headers */
1045 if (my_headerlist
->type
== '*') {
1046 my_headerlist
= my_headerlist
->next
;
1049 if (strncmpic(my_headerlist
->text
, US
"Content-Type:", 13) == 0) {
1050 DEBUG(D_receive
) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1053 my_headerlist
= my_headerlist
->next
;
1056 DEBUG(D_receive
) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1060 /* make sure the eml mbox file is spooled up */
1061 mbox_file
= spool_mbox(&mbox_size
);
1062 if (mbox_file
== NULL
) {
1063 /* error while spooling */
1064 log_write(0, LOG_MAIN
|LOG_PANIC
,
1065 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1066 Uunlink(spool_name
);
1068 smtp_respond(451, TRUE
, US
"temporary local problem");
1069 message_id
[0] = 0; /* Indicate no message accepted */
1070 *smtp_reply_ptr
= US
""; /* Indicate reply already sent */
1071 return FALSE
; /* Indicate skip to end of receive function */
1077 mime_part_count
= -1;
1078 rc
= mime_acl_check(acl
, mbox_file
, NULL
, &user_msg
, &log_msg
);
1081 if (Ustrlen(rfc822_file_path
) > 0) {
1082 mime_part_count
= mime_part_count_buffer
;
1084 if (unlink(CS rfc822_file_path
) == -1) {
1085 log_write(0, LOG_PANIC
,
1086 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1091 /* check if we must check any message/rfc822 attachments */
1093 uschar temp_path
[1024];
1095 struct dirent
*entry
;
1098 snprintf(CS temp_path
, 1024, "%s/scan/%s", spool_directory
, message_id
);
1100 tempdir
= opendir(CS temp_path
);
1103 entry
= readdir(tempdir
);
1104 if (entry
== NULL
) break;
1105 if (strncmpic(US entry
->d_name
,US
"__rfc822_",9) == 0) {
1106 snprintf(CS rfc822_file_path
, 2048,"%s/scan/%s/%s", spool_directory
, message_id
, entry
->d_name
);
1107 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n", rfc822_file_path
);
1113 if (entry
!= NULL
) {
1114 mbox_file
= Ufopen(rfc822_file_path
,"r");
1115 if (mbox_file
== NULL
) {
1116 log_write(0, LOG_PANIC
,
1117 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1118 unlink(CS rfc822_file_path
);
1121 /* set RFC822 expansion variable */
1123 mime_part_count_buffer
= mime_part_count
;
1124 goto MIME_ACL_CHECK
;
1129 add_acl_headers(US
"MIME");
1132 recipients_count
= 0;
1133 *blackholed_by_ptr
= US
"MIME ACL";
1137 Uunlink(spool_name
);
1139 if (smtp_handle_acl_fail(ACL_WHERE_MIME
, rc
, user_msg
, log_msg
) != 0)
1140 *smtp_yield_ptr
= FALSE
; /* No more messsages after dropped connection */
1141 *smtp_reply_ptr
= US
""; /* Indicate reply already sent */
1142 message_id
[0] = 0; /* Indicate no message accepted */
1143 return FALSE
; /* Cause skip to end of receive function */
1151 /*************************************************
1153 *************************************************/
1155 /* Receive a message on the given input, and put it into a pair of spool files.
1156 Either a non-null list of recipients, or the extract flag will be true, or
1157 both. The flag sender_local is true for locally generated messages. The flag
1158 submission_mode is true if an ACL has obeyed "control = submission". The flag
1159 smtp_input is true if the message is to be handled using SMTP conventions about
1160 termination and lines starting with dots. For non-SMTP messages, dot_ends is
1161 true for dot-terminated messages.
1163 If a message was successfully read, message_id[0] will be non-zero.
1165 The general actions of this function are:
1167 . Read the headers of the message (if any) into a chain of store
1170 . If there is a "sender:" header and the message is locally originated,
1171 throw it away, unless the caller is trusted, or unless
1172 active_local_sender_retain is set - which can only happen if
1173 active_local_from_check is false.
1175 . If recipients are to be extracted from the message, build the
1176 recipients list from the headers, removing any that were on the
1177 original recipients list (unless extract_addresses_remove_arguments is
1178 false), and at the same time, remove any bcc header that may be present.
1180 . Get the spool file for the data, sort out its unique name, open
1181 and lock it (but don't give it the name yet).
1183 . Generate a "Message-Id" header if the message doesn't have one, for
1184 locally-originated messages.
1186 . Generate a "Received" header.
1188 . Ensure the recipients list is fully qualified and rewritten if necessary.
1190 . If there are any rewriting rules, apply them to the sender address
1191 and also to the headers.
1193 . If there is no from: header, generate one, for locally-generated messages
1194 and messages in "submission mode" only.
1196 . If the sender is local, check that from: is correct, and if not, generate
1197 a Sender: header, unless message comes from a trusted caller, or this
1198 feature is disabled by active_local_from_check being false.
1200 . If there is no "date" header, generate one, for locally-originated
1201 or submission mode messages only.
1203 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1204 dot_ends mode, to the data file. Leave it open, to hold the lock.
1206 . Write the envelope and the headers to a new file.
1208 . Set the name for the header file; close it.
1210 . Set the name for the data file; close it.
1212 Because this function can potentially be called many times in a single
1213 SMTP connection, all store should be got by store_get(), so that it will be
1214 automatically retrieved after the message is accepted.
1216 FUDGE: It seems that sites on the net send out messages with just LF
1217 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1218 we make the CRs optional in all cases.
1220 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1221 new regime is now in place in which bare CRs in header lines are turned into LF
1222 followed by a space, so as not to terminate the header line.
1224 February 2004: A bare LF in a header line in a message whose first line was
1225 terminated by CRLF is treated in the same way as a bare CR.
1228 extract_recip TRUE if recipients are to be extracted from the message's
1231 Returns: TRUE there are more messages to be read (SMTP input)
1232 FALSE there are no more messages to be read (non-SMTP input
1233 or SMTP connection collapsed, or other failure)
1235 When reading a message for filter testing, the returned value indicates
1236 whether the headers (which is all that is read) were terminated by '.' or
1240 receive_msg(BOOL extract_recip
)
1244 int process_info_len
= Ustrlen(process_info
);
1245 int error_rc
= (error_handling
== ERRORS_SENDER
)?
1246 errors_sender_rc
: EXIT_FAILURE
;
1247 int header_size
= 256;
1248 int start
, end
, domain
, size
, sptr
;
1252 register int ptr
= 0;
1254 BOOL contains_resent_headers
= FALSE
;
1255 BOOL extracted_ignored
= FALSE
;
1256 BOOL first_line_ended_crlf
= TRUE_UNSET
;
1257 BOOL smtp_yield
= TRUE
;
1260 BOOL resents_exist
= FALSE
;
1261 uschar
*resent_prefix
= US
"";
1262 uschar
*blackholed_by
= NULL
;
1263 uschar
*blackhole_log_msg
= US
"";
1266 error_block
*bad_addresses
= NULL
;
1268 uschar
*frozen_by
= NULL
;
1269 uschar
*queued_by
= NULL
;
1272 struct stat statbuf
;
1274 /* Final message to give to SMTP caller */
1276 uschar
*smtp_reply
= NULL
;
1278 /* Working header pointers */
1280 header_line
*h
, *next
;
1282 /* Flags for noting the existence of certain headers */
1284 /**** No longer check for these (Nov 2003)
1285 BOOL to_or_cc_header_exists = FALSE;
1286 BOOL bcc_header_exists = FALSE;
1289 BOOL date_header_exists
= FALSE
;
1291 /* Pointers to receive the addresses of headers whose contents we need. */
1293 header_line
*from_header
= NULL
;
1294 header_line
*subject_header
= NULL
;
1295 header_line
*msgid_header
= NULL
;
1296 header_line
*received_header
;
1298 /* Variables for use when building the Received: header. */
1304 /* Release any open files that might have been cached while preparing to
1305 accept the message - e.g. by verifying addresses - because reading a message
1306 might take a fair bit of real time. */
1310 /* Initialize the chain of headers by setting up a place-holder for Received:
1311 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1312 pointing to the end of the chain to make adding headers simple. */
1314 received_header
= header_list
= header_last
= store_get(sizeof(header_line
));
1315 header_list
->next
= NULL
;
1316 header_list
->type
= htype_old
;
1317 header_list
->text
= NULL
;
1318 header_list
->slen
= 0;
1320 /* Control block for the next header to be read. */
1322 next
= store_get(sizeof(header_line
));
1323 next
->text
= store_get(header_size
);
1325 /* Initialize message id to be null (indicating no message read), and the
1326 header names list to be the normal list. Indicate there is no data file open
1327 yet, initialize the size and warning count, and deal with no size limit. */
1335 received_count
= 1; /* For the one we will add */
1337 if (thismessage_size_limit
<= 0) thismessage_size_limit
= INT_MAX
;
1339 /* While reading the message, body_linecount and body_zerocount is computed.
1340 The full message_ linecount is set up only when the headers are read back in
1341 from the spool for delivery. */
1343 body_linecount
= body_zerocount
= 0;
1345 #ifdef EXPERIMENTAL_DOMAINKEYS
1346 /* Call into DK to set up the context. Check if DK is to be run are carried out
1347 inside dk_exim_verify_init(). */
1348 dk_exim_verify_init();
1351 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1352 ids, and fractions of a second are required. See the comments that precede the
1353 message id creation below. */
1355 (void)gettimeofday(&message_id_tv
, NULL
);
1357 /* For other uses of the received time we can operate with granularity of one
1358 second, and for that we use the global variable received_time. This is for
1359 things like ultimate message timeouts. */
1361 received_time
= message_id_tv
.tv_sec
;
1363 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1364 happen in the smtp_getc() function when it refills its buffer. */
1366 if (smtp_input
) os_non_restarting_signal(SIGALRM
, data_timeout_handler
);
1368 /* If not SMTP input, timeout happens only if configured, and we just set a
1369 single timeout for the whole message. */
1371 else if (receive_timeout
> 0)
1373 os_non_restarting_signal(SIGALRM
, data_timeout_handler
);
1374 alarm(receive_timeout
);
1377 /* SIGTERM and SIGINT are caught always. */
1379 signal(SIGTERM
, data_sigterm_sigint_handler
);
1380 signal(SIGINT
, data_sigterm_sigint_handler
);
1382 /* Header lines in messages are not supposed to be very long, though when
1383 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1384 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1385 storing the header, and extend this as necessary using string_cat().
1387 To cope with total lunacies, impose an upper limit on the length of the header
1388 section of the message, as otherwise the store will fill up. We must also cope
1389 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1390 Folded header lines are joined into one string, leaving the '\n' characters
1391 inside them, so that writing them out reproduces the input.
1393 Loop for each character of each header; the next structure for chaining the
1394 header is set up already, with ptr the offset of the next character in
1399 int ch
= (RECEIVE_GETC
)();
1401 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1402 SMTP must have a correct "." terminator. */
1404 if (ch
== EOF
&& smtp_input
/* && !smtp_batched_input */)
1406 smtp_reply
= handle_lost_connection(US
" (header)");
1408 goto TIDYUP
; /* Skip to end of function */
1411 /* See if we are at the current header's size limit - there must be at least
1412 four bytes left. This allows for the new character plus a zero, plus two for
1413 extra insertions when we are playing games with dots and carriage returns. If
1414 we are at the limit, extend the text buffer. This could have been done
1415 automatically using string_cat() but because this is a tightish loop storing
1416 only one character at a time, we choose to do it inline. Normally
1417 store_extend() will be able to extend the block; only at the end of a big
1418 store block will a copy be needed. To handle the case of very long headers
1419 (and sometimes lunatic messages can have ones that are 100s of K long) we
1420 call store_release() for strings that have been copied - if the string is at
1421 the start of a block (and therefore the only thing in it, because we aren't
1422 doing any other gets), the block gets freed. We can only do this because we
1423 know there are no other calls to store_get() going on. */
1425 if (ptr
>= header_size
- 4)
1427 int oldsize
= header_size
;
1428 /* header_size += 256; */
1430 if (!store_extend(next
->text
, oldsize
, header_size
))
1432 uschar
*newtext
= store_get(header_size
);
1433 memcpy(newtext
, next
->text
, ptr
);
1434 store_release(next
->text
);
1435 next
->text
= newtext
;
1439 /* Cope with receiving a binary zero. There is dispute about whether
1440 these should be allowed in RFC 822 messages. The middle view is that they
1441 should not be allowed in headers, at least. Exim takes this attitude at
1442 the moment. We can't just stomp on them here, because we don't know that
1443 this line is a header yet. Set a flag to cause scanning later. */
1445 if (ch
== 0) had_zero
++;
1447 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1448 those from data files use just LF. Treat LF in local SMTP input as a
1449 terminator too. Treat EOF as a line terminator always. */
1451 if (ch
== EOF
) goto EOL
;
1453 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1454 other MTAs accept this. We are therefore forced into this "liberalisation"
1455 too, so we accept LF as a line terminator whatever the source of the message.
1456 However, if the first line of the message ended with a CRLF, we treat a bare
1457 LF specially by inserting a white space after it to ensure that the header
1458 line is not terminated. */
1462 if (first_line_ended_crlf
== TRUE_UNSET
) first_line_ended_crlf
= FALSE
;
1463 else if (first_line_ended_crlf
) RECEIVE_UNGETC(' ');
1467 /* This is not the end of the line. If this is SMTP input and this is
1468 the first character in the line and it is a "." character, ignore it.
1469 This implements the dot-doubling rule, though header lines starting with
1470 dots aren't exactly common. They are legal in RFC 822, though. If the
1471 following is CRLF or LF, this is the line that that terminates the
1472 entire message. We set message_ended to indicate this has happened (to
1473 prevent further reading), and break out of the loop, having freed the
1474 empty header, and set next = NULL to indicate no data line. */
1476 if (ptr
== 0 && ch
== '.' && (smtp_input
|| dot_ends
))
1478 ch
= (RECEIVE_GETC
)();
1481 ch
= (RECEIVE_GETC
)();
1485 ch
= '\r'; /* Revert to CR */
1490 message_ended
= END_DOT
;
1493 break; /* End character-reading loop */
1496 /* For non-SMTP input, the dot at the start of the line was really a data
1497 character. What is now in ch is the following character. We guaranteed
1498 enough space for this above. */
1502 next
->text
[ptr
++] = '.';
1507 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1508 remember this case if this is the first line ending. */
1512 ch
= (RECEIVE_GETC
)();
1515 if (first_line_ended_crlf
== TRUE_UNSET
) first_line_ended_crlf
= TRUE
;
1519 /* Otherwise, put back the character after CR, and turn the bare CR
1522 ch
= (RECEIVE_UNGETC
)(ch
);
1523 next
->text
[ptr
++] = '\n';
1528 /* We have a data character for the header line. */
1530 next
->text
[ptr
++] = ch
; /* Add to buffer */
1531 message_size
++; /* Total message size so far */
1533 /* Handle failure due to a humungously long header section. The >= allows
1534 for the terminating \n. Add what we have so far onto the headers list so
1535 that it gets reflected in any error message, and back up the just-read
1538 if (message_size
>= header_maxsize
)
1540 next
->text
[ptr
] = 0;
1542 next
->type
= htype_other
;
1544 header_last
->next
= next
;
1547 log_write(0, LOG_MAIN
, "ridiculously long message header received from "
1548 "%s (more than %d characters): message abandoned",
1549 sender_host_unknown
? sender_ident
: sender_fullhost
, header_maxsize
);
1553 smtp_reply
= US
"552 Message header is ridiculously long";
1554 receive_swallow_smtp();
1555 goto TIDYUP
; /* Skip to end of function */
1560 give_local_error(ERRMESS_VLONGHEADER
,
1561 string_sprintf("message header longer than %d characters received: "
1562 "message not accepted", header_maxsize
), US
"", error_rc
, stdin
,
1564 /* Does not return */
1568 continue; /* With next input character */
1570 /* End of header line reached */
1573 receive_linecount
++; /* For BSMTP errors */
1575 /* Now put in the terminating newline. There is always space for
1576 at least two more characters. */
1578 next
->text
[ptr
++] = '\n';
1581 /* A blank line signals the end of the headers; release the unwanted
1582 space and set next to NULL to indicate this. */
1591 /* There is data in the line; see if the next input character is a
1592 whitespace character. If it is, we have a continuation of this header line.
1593 There is always space for at least one character at this point. */
1597 int nextch
= (RECEIVE_GETC
)();
1598 if (nextch
== ' ' || nextch
== '\t')
1600 next
->text
[ptr
++] = nextch
;
1602 continue; /* Iterate the loop */
1604 else if (nextch
!= EOF
) (RECEIVE_UNGETC
)(nextch
); /* For next time */
1605 else ch
= EOF
; /* Cause main loop to exit at end */
1608 /* We have got to the real line end. Terminate the string and release store
1609 beyond it. If it turns out to be a real header, internal binary zeros will
1610 be squashed later. */
1612 next
->text
[ptr
] = 0;
1614 store_reset(next
->text
+ ptr
+ 1);
1616 /* Check the running total size against the overall message size limit. We
1617 don't expect to fail here, but if the overall limit is set less than MESSAGE_
1618 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
1619 headers - the code to read the body will then also hit the buffer. */
1621 if (message_size
> thismessage_size_limit
) break;
1623 /* A line that is not syntactically correct for a header also marks
1624 the end of the headers. In this case, we leave next containing the
1625 first data line. This might actually be several lines because of the
1626 continuation logic applied above, but that doesn't matter.
1628 It turns out that smail, and presumably sendmail, accept leading lines
1631 From ph10 Fri Jan 5 12:35 GMT 1996
1633 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
1634 find any documentation of this, but for compatibility it had better be
1635 accepted. Exim restricts it to the case of non-smtp messages, and
1636 treats it as an alternative to the -f command line option. Thus it is
1637 ignored except for trusted users or filter testing. Otherwise it is taken
1638 as the sender address, unless -f was used (sendmail compatibility).
1640 It further turns out that some UUCPs generate the From_line in a different
1643 From ph10 Fri, 7 Jan 97 14:00:00 GMT
1645 The regex for matching these things is now capable of recognizing both
1646 formats (including 2- and 4-digit years in the latter). In fact, the regex
1647 is now configurable, as is the expansion string to fish out the sender.
1649 Even further on it has been discovered that some broken clients send
1650 these lines in SMTP messages. There is now an option to ignore them from
1651 specified hosts or networks. Sigh. */
1653 if (header_last
== header_list
&&
1656 (sender_host_address
!= NULL
&&
1657 verify_check_host(&ignore_fromline_hosts
) == OK
)
1659 (sender_host_address
== NULL
&& ignore_fromline_local
)
1661 regex_match_and_setup(regex_From
, next
->text
, 0, -1))
1663 if (!sender_address_forced
)
1665 uschar
*uucp_sender
= expand_string(uucp_from_sender
);
1666 if (uucp_sender
== NULL
)
1668 log_write(0, LOG_MAIN
|LOG_PANIC
,
1669 "expansion of \"%s\" failed after matching "
1670 "\"From \" line: %s", uucp_from_sender
, expand_string_message
);
1674 int start
, end
, domain
;
1676 uschar
*newsender
= parse_extract_address(uucp_sender
, &errmess
,
1677 &start
, &end
, &domain
, TRUE
);
1678 if (newsender
!= NULL
)
1680 if (domain
== 0 && newsender
[0] != 0)
1681 newsender
= rewrite_address_qualify(newsender
, FALSE
);
1683 if (filter_test
!= FTEST_NONE
|| receive_check_set_sender(newsender
))
1685 sender_address
= newsender
;
1687 if (trusted_caller
|| filter_test
!= FTEST_NONE
)
1689 authenticated_sender
= NULL
;
1690 originator_name
= US
"";
1691 sender_local
= FALSE
;
1694 if (filter_test
!= FTEST_NONE
)
1695 printf("Sender taken from \"From \" line\n");
1702 /* Not a leading "From " line. Check to see if it is a valid header line.
1703 Header names may contain any non-control characters except space and colon,
1708 uschar
*p
= next
->text
;
1710 /* If not a valid header line, break from the header reading loop, leaving
1711 next != NULL, indicating that it holds the first line of the body. */
1713 if (isspace(*p
)) break;
1714 while (mac_isgraph(*p
) && *p
!= ':') p
++;
1715 while (isspace(*p
)) p
++;
1718 body_zerocount
= had_zero
;
1722 /* We have a valid header line. If there were any binary zeroes in
1723 the line, stomp on them here. */
1726 for (p
= next
->text
; p
< next
->text
+ ptr
; p
++) if (*p
== 0) *p
= '?';
1728 /* It is perfectly legal to have an empty continuation line
1729 at the end of a header, but it is confusing to humans
1730 looking at such messages, since it looks like a blank line.
1731 Reduce confusion by removing redundant white space at the
1732 end. We know that there is at least one printing character
1733 (the ':' tested for above) so there is no danger of running
1736 p
= next
->text
+ ptr
- 2;
1739 while (*p
== ' ' || *p
== '\t') p
--;
1740 if (*p
!= '\n') break;
1741 ptr
= (p
--) - next
->text
+ 1;
1742 message_size
-= next
->slen
- ptr
;
1743 next
->text
[ptr
] = 0;
1747 /* Add the header to the chain */
1749 next
->type
= htype_other
;
1751 header_last
->next
= next
;
1754 /* Check the limit for individual line lengths. This comes after adding to
1755 the chain so that the failing line is reflected if a bounce is generated
1756 (for a local message). */
1758 if (header_line_maxsize
> 0 && next
->slen
> header_line_maxsize
)
1760 log_write(0, LOG_MAIN
, "overlong message header line received from "
1761 "%s (more than %d characters): message abandoned",
1762 sender_host_unknown
? sender_ident
: sender_fullhost
,
1763 header_line_maxsize
);
1767 smtp_reply
= US
"552 A message header line is too long";
1768 receive_swallow_smtp();
1769 goto TIDYUP
; /* Skip to end of function */
1774 give_local_error(ERRMESS_VLONGHDRLINE
,
1775 string_sprintf("message header line longer than %d characters "
1776 "received: message not accepted", header_line_maxsize
), US
"",
1777 error_rc
, stdin
, header_list
->next
);
1778 /* Does not return */
1782 /* Note if any resent- fields exist. */
1784 if (!resents_exist
&& strncmpic(next
->text
, US
"resent-", 7) == 0)
1786 resents_exist
= TRUE
;
1787 resent_prefix
= US
"Resent-";
1791 /* The line has been handled. If we have hit EOF, break out of the loop,
1792 indicating no pending data line. */
1794 if (ch
== EOF
) { next
= NULL
; break; }
1796 /* Set up for the next header */
1799 next
= store_get(sizeof(header_line
));
1800 next
->text
= store_get(header_size
);
1803 } /* Continue, starting to read the next header */
1805 /* At this point, we have read all the headers into a data structure in main
1806 store. The first header is still the dummy placeholder for the Received: header
1807 we are going to generate a bit later on. If next != NULL, it contains the first
1808 data line - which terminated the headers before reaching a blank line (not the
1813 debug_printf(">>Headers received:\n");
1814 for (h
= header_list
->next
; h
!= NULL
; h
= h
->next
)
1815 debug_printf("%s", h
->text
);
1819 /* End of file on any SMTP connection is an error. If an incoming SMTP call
1820 is dropped immediately after valid headers, the next thing we will see is EOF.
1821 We must test for this specially, as further down the reading of the data is
1822 skipped if already at EOF. */
1824 if (smtp_input
&& (receive_feof
)())
1826 smtp_reply
= handle_lost_connection(US
" (after header)");
1828 goto TIDYUP
; /* Skip to end of function */
1831 /* If this is a filter test run and no headers were read, output a warning
1832 in case there is a mistake in the test message. */
1834 if (filter_test
!= FTEST_NONE
&& header_list
->next
== NULL
)
1835 printf("Warning: no message headers read\n");
1838 /* Scan the headers to identify them. Some are merely marked for later
1839 processing; some are dealt with here. */
1841 for (h
= header_list
->next
; h
!= NULL
; h
= h
->next
)
1843 BOOL is_resent
= strncmpic(h
->text
, US
"resent-", 7) == 0;
1844 if (is_resent
) contains_resent_headers
= TRUE
;
1846 switch (header_checkname(h
, is_resent
))
1848 /* "Bcc:" gets flagged, and its existence noted, whether it's resent- or
1852 h
->type
= htype_bcc
;
1854 bcc_header_exists = TRUE;
1858 /* "Cc:" gets flagged, and the existence of a recipient header is noted,
1859 whether it's resent- or not. */
1864 to_or_cc_header_exists = TRUE;
1868 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
1871 date_header_exists
= !resents_exist
|| is_resent
;
1874 /* Same comments as about Return-Path: below. */
1876 case htype_delivery_date
:
1877 if (delivery_date_remove
) h
->type
= htype_old
;
1880 /* Same comments as about Return-Path: below. */
1882 case htype_envelope_to
:
1883 if (envelope_to_remove
) h
->type
= htype_old
;
1886 /* Mark all "From:" headers so they get rewritten. Save the one that is to
1887 be used for Sender: checking. For Sendmail compatibility, if the "From:"
1888 header consists of just the login id of the user who called Exim, rewrite
1889 it with the gecos field first. Apply this rule to Resent-From: if there
1890 are resent- fields. */
1893 h
->type
= htype_from
;
1894 if (!resents_exist
|| is_resent
)
1899 uschar
*s
= Ustrchr(h
->text
, ':') + 1;
1900 while (isspace(*s
)) s
++;
1901 if (strncmpic(s
, originator_login
, h
->slen
- (s
- h
->text
) - 1) == 0)
1903 uschar
*name
= is_resent
? US
"Resent-From" : US
"From";
1904 header_add(htype_from
, "%s: %s <%s@%s>\n", name
, originator_name
,
1905 originator_login
, qualify_domain_sender
);
1906 from_header
= header_last
;
1907 h
->type
= htype_old
;
1908 DEBUG(D_receive
|D_rewrite
)
1909 debug_printf("rewrote \"%s:\" header using gecos\n", name
);
1915 /* Identify the Message-id: header for generating "in-reply-to" in the
1916 autoreply transport. For incoming logging, save any resent- value. In both
1917 cases, take just the first of any multiples. */
1920 if (msgid_header
== NULL
&& (!resents_exist
|| is_resent
))
1927 /* Flag all Received: headers */
1929 case htype_received
:
1930 h
->type
= htype_received
;
1934 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
1936 case htype_reply_to
:
1937 h
->type
= htype_reply_to
;
1940 /* The Return-path: header is supposed to be added to messages when
1941 they leave the SMTP system. We shouldn't receive messages that already
1942 contain Return-path. However, since Exim generates Return-path: on
1943 local delivery, resent messages may well contain it. We therefore
1944 provide an option (which defaults on) to remove any Return-path: headers
1945 on input. Removal actually means flagging as "old", which prevents the
1946 header being transmitted with the message. */
1948 case htype_return_path
:
1949 if (return_path_remove
) h
->type
= htype_old
;
1951 /* If we are testing a mail filter file, use the value of the
1952 Return-Path: header to set up the return_path variable, which is not
1953 otherwise set. However, remove any <> that surround the address
1954 because the variable doesn't have these. */
1956 if (filter_test
!= FTEST_NONE
)
1958 uschar
*start
= h
->text
+ 12;
1959 uschar
*end
= start
+ Ustrlen(start
);
1960 while (isspace(*start
)) start
++;
1961 while (end
> start
&& isspace(end
[-1])) end
--;
1962 if (*start
== '<' && end
[-1] == '>')
1967 return_path
= string_copyn(start
, end
- start
);
1968 printf("Return-path taken from \"Return-path:\" header line\n");
1972 /* If there is a "Sender:" header and the message is locally originated,
1973 and from an untrusted caller, or if we are in submission mode for a remote
1974 message, mark it "old" so that it will not be transmitted with the message,
1975 unless active_local_sender_retain is set. (This can only be true if
1976 active_local_from_check is false.) If there are any resent- headers in the
1977 message, apply this rule to Resent-Sender: instead of Sender:. Messages
1978 with multiple resent- header sets cannot be tidily handled. (For this
1979 reason, at least one MUA - Pine - turns old resent- headers into X-resent-
1980 headers when resending, leaving just one set.) */
1983 h
->type
= ((!active_local_sender_retain
&&
1984 ((sender_local
&& !trusted_caller
) || submission_mode
)
1986 (!resents_exist
||is_resent
))?
1987 htype_old
: htype_sender
;
1990 /* Remember the Subject: header for logging. There is no Resent-Subject */
1996 /* "To:" gets flagged, and the existence of a recipient header is noted,
1997 whether it's resent- or not. */
2002 to_or_cc_header_exists = TRUE;
2008 /* Extract recipients from the headers if that is required (the -t option).
2009 Note that this is documented as being done *before* any address rewriting takes
2010 place. There are two possibilities:
2012 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2013 recipients already listed are to be REMOVED from the message. Smail 3 works
2014 like this. We need to build a non-recipients tree for that list, because in
2015 subsequent processing this data is held in a tree and that's what the
2016 spool_write_header() function expects. Make sure that non-recipient addresses
2017 are fully qualified and rewritten if necessary.
2019 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2020 those in the command line arguments (and it is rumoured some other MTAs do
2021 this). Therefore, there is an option to make Exim behave this way.
2023 *** Notes on "Resent-" header lines ***
2025 The presence of resent-headers in the message makes -t horribly ambiguous.
2026 Experiments with sendmail showed that it uses recipients for all resent-
2027 headers, totally ignoring the concept of "sets of resent- headers" as described
2028 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2029 with all the addresses in one instance of each header.
2031 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2032 error for -t if there were resent- headers in the message. However, after a
2033 discussion on the mailing list, I've learned that there are MUAs that use
2034 resent- headers with -t, and also that the stuff about sets of resent- headers
2035 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2036 message with -t and resent- header lines makes sure that only *its* resent-
2037 headers are present; previous ones are often renamed as X-resent- for example.
2039 Consequently, Exim has been changed so that, if any resent- header lines are
2040 present, the recipients are taken from all of the appropriate resent- lines,
2041 and not from the ordinary To:, Cc:, etc. */
2046 error_block
**bnext
= &bad_addresses
;
2048 if (extract_addresses_remove_arguments
)
2050 while (recipients_count
-- > 0)
2052 uschar
*s
= rewrite_address(recipients_list
[recipients_count
].address
,
2053 TRUE
, TRUE
, global_rewrite_rules
, rewrite_existflags
);
2054 tree_add_nonrecipient(s
);
2056 recipients_list
= NULL
;
2057 recipients_count
= recipients_list_max
= 0;
2060 parse_allow_group
= TRUE
; /* Allow address group syntax */
2062 /* Now scan the headers */
2064 for (h
= header_list
->next
; h
!= NULL
; h
= h
->next
)
2066 if ((h
->type
== htype_to
|| h
->type
== htype_cc
|| h
->type
== htype_bcc
) &&
2067 (!contains_resent_headers
|| strncmpic(h
->text
, US
"resent-", 7) == 0))
2069 uschar
*s
= Ustrchr(h
->text
, ':') + 1;
2070 while (isspace(*s
)) s
++;
2074 uschar
*ss
= parse_find_address_end(s
, FALSE
);
2075 uschar
*recipient
, *errmess
, *p
, *pp
;
2076 int start
, end
, domain
;
2078 /* Check on maximum */
2080 if (recipients_max
> 0 && ++rcount
> recipients_max
)
2082 give_local_error(ERRMESS_TOOMANYRECIP
, US
"too many recipients",
2083 US
"message rejected: ", error_rc
, stdin
, NULL
);
2084 /* Does not return */
2087 /* Make a copy of the address, and remove any internal newlines. These
2088 may be present as a result of continuations of the header line. The
2089 white space that follows the newline must not be removed - it is part
2092 pp
= recipient
= store_get(ss
- s
+ 1);
2093 for (p
= s
; p
< ss
; p
++) if (*p
!= '\n') *pp
++ = *p
;
2095 recipient
= parse_extract_address(recipient
, &errmess
, &start
, &end
,
2098 /* Keep a list of all the bad addresses so we can send a single
2099 error message at the end. However, an empty address is not an error;
2100 just ignore it. This can come from an empty group list like
2102 To: Recipients of list:;
2104 If there are no recipients at all, an error will occur later. */
2106 if (recipient
== NULL
&& Ustrcmp(errmess
, "empty address") != 0)
2108 int len
= Ustrlen(s
);
2109 error_block
*b
= store_get(sizeof(error_block
));
2110 while (len
> 0 && isspace(s
[len
-1])) len
--;
2112 b
->text1
= string_printing(string_copyn(s
, len
));
2118 /* If the recipient is already in the nonrecipients tree, it must
2119 have appeared on the command line with the option extract_addresses_
2120 remove_arguments set. Do not add it to the recipients, and keep a note
2121 that this has happened, in order to give a better error if there are
2122 no recipients left. */
2124 else if (recipient
!= NULL
)
2126 if (tree_search(tree_nonrecipients
, recipient
) == NULL
)
2127 receive_add_recipient(recipient
, -1);
2129 extracted_ignored
= TRUE
;
2132 /* Move on past this address */
2134 s
= ss
+ (*ss
? 1:0);
2135 while (isspace(*s
)) s
++;
2138 /* If this was the bcc: header, mark it "old", which means it
2139 will be kept on the spool, but not transmitted as part of the
2142 if (h
->type
== htype_bcc
)
2144 h
->type
= htype_old
;
2146 bcc_header_exists = FALSE;
2149 } /* For appropriate header line */
2150 } /* For each header line */
2152 parse_allow_group
= FALSE
; /* Reset group syntax flags */
2153 parse_found_group
= FALSE
;
2156 /* Now build the unique message id. This has changed several times over the
2157 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2158 Retaining all the history in the comment has become too unwieldy - read
2159 previous release sources if you want it.
2161 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2162 The first part is the current time, in seconds. The second part is the current
2163 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2164 can hold a number in the range 0-3843. It used to be a computed sequence
2165 number, but is now the fractional component of the current time in units of
2166 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2167 received, Exim ensures that the timer has ticked at the appropriate level
2168 before proceeding, to avoid duplication if the pid happened to be re-used
2169 within the same time period. It seems likely that most messages will take at
2170 least half a millisecond to be received, so no delay will normally be
2171 necessary. At least for some time...
2173 There is a modification when localhost_number is set. Formerly this was allowed
2174 to be as large as 255. Now it is restricted to the range 0-16, and the final
2175 component of the message id becomes (localhost_number * 200) + fractional time
2176 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2178 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2179 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2180 still allows the tttttt field to hold a large enough number to last for some
2181 more decades, and the final two-digit field can hold numbers up to 1295, which
2182 is enough for milliseconds (instead of 1/2000 of a second).
2184 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2185 pid, so it is probably safe because pids have to be positive. The
2186 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2187 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2189 Note that string_base62() returns its data in a static storage block, so it
2190 must be copied before calling string_base62() again. It always returns exactly
2193 There doesn't seem to be anything in the RFC which requires a message id to
2194 start with a letter, but Smail was changed to ensure this. The external form of
2195 the message id (as supplied by string expansion) therefore starts with an
2196 additional leading 'E'. The spool file names do not include this leading
2197 letter and it is not used internally.
2199 NOTE: If ever the format of message ids is changed, the regular expression for
2200 checking that a string is in this format must be updated in a corresponding
2201 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2202 must also be changed to reflect the correct string length. Then, of course,
2203 other programs that rely on the message id format will need updating too. */
2205 Ustrncpy(message_id
, string_base62((long int)(message_id_tv
.tv_sec
)), 6);
2206 message_id
[6] = '-';
2207 Ustrncpy(message_id
+ 7, string_base62((long int)getpid()), 6);
2209 /* Deal with the case where the host number is set. The value of the number was
2210 checked when it was read, to ensure it isn't too big. The timing granularity is
2211 left in id_resolution so that an appropriate wait can be done after receiving
2212 the message, if necessary (we hope it won't be). */
2214 if (host_number_string
!= NULL
)
2216 id_resolution
= (BASE_62
== 62)? 5000 : 10000;
2217 sprintf(CS(message_id
+ MESSAGE_ID_LENGTH
- 3), "-%2s",
2218 string_base62((long int)(
2219 host_number
* (1000000/id_resolution
) +
2220 message_id_tv
.tv_usec
/id_resolution
)) + 4);
2223 /* Host number not set: final field is just the fractional time at an
2224 appropriate resolution. */
2228 id_resolution
= (BASE_62
== 62)? 500 : 1000;
2229 sprintf(CS(message_id
+ MESSAGE_ID_LENGTH
- 3), "-%2s",
2230 string_base62((long int)(message_id_tv
.tv_usec
/id_resolution
)) + 4);
2233 /* Add the current message id onto the current process info string if
2236 (void)string_format(process_info
+ process_info_len
,
2237 PROCESS_INFO_SIZE
- process_info_len
, " id=%s", message_id
);
2239 /* If we are using multiple input directories, set up the one for this message
2240 to be the least significant base-62 digit of the time of arrival. Otherwise
2241 ensure that it is an empty string. */
2243 message_subdir
[0] = split_spool_directory
? message_id
[5] : 0;
2245 /* Now that we have the message-id, if there is no message-id: header, generate
2246 one, but only for local or submission mode messages. This can be
2247 user-configured if required, but we had better flatten any illegal characters
2250 if (msgid_header
== NULL
&& (sender_host_address
== NULL
|| submission_mode
))
2253 uschar
*id_text
= US
"";
2254 uschar
*id_domain
= primary_hostname
;
2256 /* Permit only letters, digits, dots, and hyphens in the domain */
2258 if (message_id_domain
!= NULL
)
2260 uschar
*new_id_domain
= expand_string(message_id_domain
);
2261 if (new_id_domain
== NULL
)
2263 if (!expand_string_forcedfail
)
2264 log_write(0, LOG_MAIN
|LOG_PANIC
,
2265 "expansion of \"%s\" (message_id_header_domain) "
2266 "failed: %s", message_id_domain
, expand_string_message
);
2268 else if (*new_id_domain
!= 0)
2270 id_domain
= new_id_domain
;
2271 for (p
= id_domain
; *p
!= 0; p
++)
2272 if (!isalnum(*p
) && *p
!= '.') *p
= '-'; /* No need to test '-' ! */
2276 /* Permit all characters except controls and RFC 2822 specials in the
2277 additional text part. */
2279 if (message_id_text
!= NULL
)
2281 uschar
*new_id_text
= expand_string(message_id_text
);
2282 if (new_id_text
== NULL
)
2284 if (!expand_string_forcedfail
)
2285 log_write(0, LOG_MAIN
|LOG_PANIC
,
2286 "expansion of \"%s\" (message_id_header_text) "
2287 "failed: %s", message_id_text
, expand_string_message
);
2289 else if (*new_id_text
!= 0)
2291 id_text
= new_id_text
;
2292 for (p
= id_text
; *p
!= 0; p
++)
2293 if (mac_iscntrl_or_special(*p
)) *p
= '-';
2297 /* Add the header line */
2299 header_add(htype_id
, "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix
,
2300 message_id_external
, (*id_text
== 0)? "" : ".", id_text
, id_domain
);
2303 /* If we are to log recipients, keep a copy of the raw ones before any possible
2304 rewriting. Must copy the count, because later ACLs and the local_scan()
2305 function may mess with the real recipients. */
2307 if ((log_extra_selector
& LX_received_recipients
) != 0)
2309 raw_recipients
= store_get(recipients_count
* sizeof(uschar
*));
2310 for (i
= 0; i
< recipients_count
; i
++)
2311 raw_recipients
[i
] = string_copy(recipients_list
[i
].address
);
2312 raw_recipients_count
= recipients_count
;
2315 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2316 recipients will get here only if the conditions were right (allow_unqualified_
2317 recipient is TRUE). */
2319 for (i
= 0; i
< recipients_count
; i
++)
2320 recipients_list
[i
].address
=
2321 rewrite_address(recipients_list
[i
].address
, TRUE
, TRUE
,
2322 global_rewrite_rules
, rewrite_existflags
);
2324 /* If there is no From: header, generate one for local or submission_mode
2325 messages. If there is no sender address, but the sender is local or this is a
2326 local delivery error, use the originator login. This shouldn't happen for
2327 genuine bounces, but might happen for autoreplies. The addition of From: must
2328 be done *before* checking for the possible addition of a Sender: header,
2329 because untrusted_set_sender allows an untrusted user to set anything in the
2330 envelope (which might then get info From:) but we still want to ensure a valid
2331 Sender: if it is required. */
2333 if (from_header
== NULL
&& (sender_host_address
== NULL
|| submission_mode
))
2335 /* Envelope sender is empty */
2337 if (sender_address
[0] == 0)
2339 if (sender_local
|| local_error_message
)
2341 header_add(htype_from
, "%sFrom: %s%s%s@%s%s\n", resent_prefix
,
2343 (originator_name
[0] == 0)? "" : " <",
2344 local_part_quote(originator_login
),
2345 qualify_domain_sender
,
2346 (originator_name
[0] == 0)? "" : ">");
2348 else if (submission_mode
&& authenticated_id
!= NULL
)
2350 if (submission_domain
== NULL
)
2352 header_add(htype_from
, "%sFrom: %s@%s\n", resent_prefix
,
2353 local_part_quote(authenticated_id
), qualify_domain_sender
);
2355 else if (submission_domain
[0] == 0) /* empty => whole address set */
2357 header_add(htype_from
, "%sFrom: %s\n", resent_prefix
,
2362 header_add(htype_from
, "%sFrom: %s@%s\n", resent_prefix
,
2363 local_part_quote(authenticated_id
), submission_domain
);
2365 from_header
= header_last
; /* To get it checked for Sender: */
2369 /* There is a non-null envelope sender. Build the header using the original
2370 sender address, before any rewriting that might have been done while
2375 if (!smtp_input
|| sender_local
)
2376 header_add(htype_from
, "%sFrom: %s%s%s%s\n",
2377 resent_prefix
, originator_name
,
2378 (originator_name
[0] == 0)? "" : " <",
2379 (sender_address_unrewritten
== NULL
)?
2380 sender_address
: sender_address_unrewritten
,
2381 (originator_name
[0] == 0)? "" : ">");
2383 header_add(htype_from
, "%sFrom: %s\n", resent_prefix
, sender_address
);
2385 from_header
= header_last
; /* To get it checked for Sender: */
2390 /* If the sender is local, or if we are in submission mode and there is an
2391 authenticated_id, check that an existing From: is correct, and if not, generate
2392 a Sender: header, unless disabled. Any previously-existing Sender: header was
2393 removed above. Note that sender_local, as well as being TRUE if the caller of
2394 exim is not trusted, is also true if a trusted caller did not supply a -f
2395 argument for non-smtp input. To allow trusted callers to forge From: without
2396 supplying -f, we have to test explicitly here. If the From: header contains
2397 more than one address, then the call to parse_extract_address fails, and a
2398 Sender: header is inserted, as required. */
2400 if (from_header
!= NULL
&&
2401 (active_local_from_check
&&
2402 ((sender_local
&& !trusted_caller
) ||
2403 (submission_mode
&& authenticated_id
!= NULL
))
2406 BOOL make_sender
= TRUE
;
2407 int start
, end
, domain
;
2409 uschar
*from_address
=
2410 parse_extract_address(Ustrchr(from_header
->text
, ':') + 1, &errmess
,
2411 &start
, &end
, &domain
, FALSE
);
2412 uschar
*generated_sender_address
;
2414 if (submission_mode
)
2416 if (submission_domain
== NULL
)
2418 generated_sender_address
= string_sprintf("%s@%s",
2419 local_part_quote(authenticated_id
), qualify_domain_sender
);
2421 else if (submission_domain
[0] == 0) /* empty => full address */
2423 generated_sender_address
= string_sprintf("%s",
2428 generated_sender_address
= string_sprintf("%s@%s",
2429 local_part_quote(authenticated_id
), submission_domain
);
2433 generated_sender_address
= string_sprintf("%s@%s",
2434 local_part_quote(originator_login
), qualify_domain_sender
);
2436 /* Remove permitted prefixes and suffixes from the local part of the From:
2437 address before doing the comparison with the generated sender. */
2439 if (from_address
!= NULL
)
2442 uschar
*at
= (domain
== 0)? NULL
: from_address
+ domain
- 1;
2444 if (at
!= NULL
) *at
= 0;
2445 from_address
+= route_check_prefix(from_address
, local_from_prefix
);
2446 slen
= route_check_suffix(from_address
, local_from_suffix
);
2449 memmove(from_address
+slen
, from_address
, Ustrlen(from_address
)-slen
);
2450 from_address
+= slen
;
2452 if (at
!= NULL
) *at
= '@';
2454 if (strcmpic(generated_sender_address
, from_address
) == 0 ||
2455 (domain
== 0 && strcmpic(from_address
, originator_login
) == 0))
2456 make_sender
= FALSE
;
2459 /* We have to cause the Sender header to be rewritten if there are
2460 appropriate rewriting rules. */
2464 if (submission_mode
)
2465 header_add(htype_sender
, "%sSender: %s\n", resent_prefix
,
2466 generated_sender_address
);
2468 header_add(htype_sender
, "%sSender: %s <%s>\n",
2469 resent_prefix
, originator_name
, generated_sender_address
);
2474 /* If there are any rewriting rules, apply them to the sender address, unless
2475 it has already been rewritten as part of verification for SMTP input. */
2477 if (global_rewrite_rules
!= NULL
&& sender_address_unrewritten
== NULL
&&
2478 sender_address
[0] != 0)
2480 sender_address
= rewrite_address(sender_address
, FALSE
, TRUE
,
2481 global_rewrite_rules
, rewrite_existflags
);
2482 DEBUG(D_receive
|D_rewrite
)
2483 debug_printf("rewritten sender = %s\n", sender_address
);
2487 /* The headers must be run through rewrite_header(), because it ensures that
2488 addresses are fully qualified, as well as applying any rewriting rules that may
2491 Qualification of header addresses in a message from a remote host happens only
2492 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2493 appropriate. For local messages, qualification always happens, unless -bnq is
2494 used to explicitly suppress it. No rewriting is done for an unqualified address
2495 that is left untouched.
2497 We start at the second header, skipping our own Received:. This rewriting is
2498 documented as happening *after* recipient addresses are taken from the headers
2499 by the -t command line option. An added Sender: gets rewritten here. */
2501 for (h
= header_list
->next
; h
!= NULL
; h
= h
->next
)
2503 header_line
*newh
= rewrite_header(h
, NULL
, NULL
, global_rewrite_rules
,
2504 rewrite_existflags
, TRUE
);
2505 if (newh
!= NULL
) h
= newh
;
2509 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2510 "cc", or "bcc". Note that although the minimal examples in RFC822 show just
2511 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2512 exists, this applies to the set of resent- headers rather than the normal set.
2514 The requirement for a recipient header has been removed in RFC 2822. Earlier
2515 versions of Exim added a To: header for locally submitted messages, and an
2516 empty Bcc: header for others or when always_bcc was set. In the light of the
2517 changes in RFC 2822, we now always add Bcc: just in case there are still MTAs
2518 out there that insist on the RFC 822 syntax.
2520 November 2003: While generally revising what Exim does to fix up headers, it
2521 seems like a good time to remove this altogether. */
2524 if (!to_or_cc_header_exists && !bcc_header_exists)
2525 header_add(htype_bcc, "Bcc:\n");
2528 /* If there is no date header, generate one if the message originates locally
2529 (i.e. not over TCP/IP) or the submission mode flag is set. Messages without
2530 Date: are not valid, but it seems to be more confusing if Exim adds one to
2531 all remotely-originated messages. */
2533 if (!date_header_exists
&& (sender_host_address
== NULL
|| submission_mode
))
2534 header_add(htype_other
, "%sDate: %s\n", resent_prefix
, tod_stamp(tod_full
));
2536 search_tidyup(); /* Free any cached resources */
2538 /* Show the complete set of headers if debugging. Note that the first one (the
2539 new Received:) has not yet been set. */
2543 debug_printf(">>Headers after rewriting and local additions:\n");
2544 for (h
= header_list
->next
; h
!= NULL
; h
= h
->next
)
2545 debug_printf("%c %s", h
->type
, h
->text
);
2549 /* The headers are now complete in store. If we are running in filter
2550 testing mode, that is all this function does. Return TRUE if the message
2551 ended with a dot. */
2553 if (filter_test
!= FTEST_NONE
)
2555 process_info
[process_info_len
] = 0;
2556 return message_ended
== END_DOT
;
2559 /* Open a new spool file for the data portion of the message. We need
2560 to access it both via a file descriptor and a stream. Try to make the
2561 directory if it isn't there. Note re use of sprintf: spool_directory
2562 is checked on input to be < 200 characters long. */
2564 sprintf(CS spool_name
, "%s/input/%s/%s-D", spool_directory
, message_subdir
,
2566 data_fd
= Uopen(spool_name
, O_RDWR
|O_CREAT
|O_EXCL
, SPOOL_MODE
);
2569 if (errno
== ENOENT
)
2572 sprintf(CS temp
, "input/%s", message_subdir
);
2573 if (message_subdir
[0] == 0) temp
[5] = 0;
2574 (void)directory_make(spool_directory
, temp
, INPUT_DIRECTORY_MODE
, TRUE
);
2575 data_fd
= Uopen(spool_name
, O_RDWR
|O_CREAT
|O_EXCL
, SPOOL_MODE
);
2578 log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "Failed to create spool file %s: %s",
2579 spool_name
, strerror(errno
));
2582 /* Make sure the file's group is the Exim gid, and double-check the mode
2583 because the group setting doesn't always get set automatically. */
2585 fchown(data_fd
, exim_uid
, exim_gid
);
2586 fchmod(data_fd
, SPOOL_MODE
);
2588 /* We now have data file open. Build a stream for it and lock it. We lock only
2589 the first line of the file (containing the message ID) because otherwise there
2590 are problems when Exim is run under Cygwin (I'm told). See comments in
2591 spool_in.c, where the same locking is done. */
2593 data_file
= fdopen(data_fd
, "w+");
2594 lock_data
.l_type
= F_WRLCK
;
2595 lock_data
.l_whence
= SEEK_SET
;
2596 lock_data
.l_start
= 0;
2597 lock_data
.l_len
= SPOOL_DATA_START_OFFSET
;
2599 if (fcntl(data_fd
, F_SETLK
, &lock_data
) < 0)
2600 log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "Cannot lock %s (%d): %s", spool_name
,
2601 errno
, strerror(errno
));
2603 /* We have an open, locked data file. Write the message id to it to make it
2604 self-identifying. Then read the remainder of the input of this message and
2605 write it to the data file. If the variable next != NULL, it contains the first
2606 data line (which was read as a header but then turned out not to have the right
2607 format); write it (remembering that it might contain binary zeros). The result
2608 of fwrite() isn't inspected; instead we call ferror() below. */
2610 fprintf(data_file
, "%s-D\n", message_id
);
2613 uschar
*s
= next
->text
;
2614 int len
= next
->slen
;
2615 fwrite(s
, 1, len
, data_file
);
2616 body_linecount
++; /* Assumes only 1 line */
2619 /* Note that we might already be at end of file, or the logical end of file
2620 (indicated by '.'), or might have encountered an error while writing the
2621 message id or "next" line. */
2623 if (!ferror(data_file
) && !(receive_feof
)() && message_ended
!= END_DOT
)
2627 message_ended
= read_message_data_smtp(data_file
);
2628 receive_linecount
++; /* The terminating "." line */
2630 else message_ended
= read_message_data(data_file
);
2632 receive_linecount
+= body_linecount
; /* For BSMTP errors mainly */
2634 /* Handle premature termination of SMTP */
2636 if (smtp_input
&& message_ended
== END_EOF
)
2638 Uunlink(spool_name
); /* Lose data file when closed */
2639 message_id
[0] = 0; /* Indicate no message accepted */
2640 smtp_reply
= handle_lost_connection(US
"");
2642 goto TIDYUP
; /* Skip to end of function */
2645 /* Handle message that is too big. Don't use host_or_ident() in the log
2646 message; we want to see the ident value even for non-remote messages. */
2648 if (message_ended
== END_SIZE
)
2650 Uunlink(spool_name
); /* Lose the data file when closed */
2651 if (smtp_input
) receive_swallow_smtp(); /* Swallow incoming SMTP */
2653 log_write(L_size_reject
, LOG_MAIN
|LOG_REJECT
, "rejected from <%s>%s%s%s%s: "
2654 "message too big: read=%d max=%d",
2656 (sender_fullhost
== NULL
)? "" : " H=",
2657 (sender_fullhost
== NULL
)? US
"" : sender_fullhost
,
2658 (sender_ident
== NULL
)? "" : " U=",
2659 (sender_ident
== NULL
)? US
"" : sender_ident
,
2661 thismessage_size_limit
);
2665 smtp_reply
= US
"552 Message size exceeds maximum permitted";
2666 message_id
[0] = 0; /* Indicate no message accepted */
2667 goto TIDYUP
; /* Skip to end of function */
2671 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
2672 give_local_error(ERRMESS_TOOBIG
,
2673 string_sprintf("message too big (max=%d)", thismessage_size_limit
),
2674 US
"message rejected: ", error_rc
, data_file
, header_list
);
2675 /* Does not return */
2680 /* Restore the standard SIGALRM handler for any subsequent processing. (For
2681 example, there may be some expansion in an ACL that uses a timer.) */
2683 os_non_restarting_signal(SIGALRM
, sigalrm_handler
);
2685 /* The message body has now been read into the data file. Call fflush() to
2686 empty the buffers in C, and then call fsync() to get the data written out onto
2687 the disk, as fflush() doesn't do this (or at least, it isn't documented as
2688 having to do this). If there was an I/O error on either input or output,
2689 attempt to send an error message, and unlink the spool file. For non-SMTP input
2690 we can then give up. Note that for SMTP input we must swallow the remainder of
2691 the input in cases of output errors, since the far end doesn't expect to see
2692 anything until the terminating dot line is sent. */
2694 if (fflush(data_file
) == EOF
|| ferror(data_file
) ||
2695 fsync(fileno(data_file
)) < 0 || (receive_ferror
)())
2697 uschar
*msg_errno
= US
strerror(errno
);
2698 BOOL input_error
= (receive_ferror
)() != 0;
2699 uschar
*msg
= string_sprintf("%s error (%s) while receiving message from %s",
2700 input_error
? "Input read" : "Spool write",
2702 (sender_fullhost
!= NULL
)? sender_fullhost
: sender_ident
);
2704 log_write(0, LOG_MAIN
, "Message abandoned: %s", msg
);
2705 Uunlink(spool_name
); /* Lose the data file */
2710 smtp_reply
= US
"451 Error while reading input data";
2713 smtp_reply
= US
"451 Error while writing spool file";
2714 receive_swallow_smtp();
2716 message_id
[0] = 0; /* Indicate no message accepted */
2717 goto TIDYUP
; /* Skip to end of function */
2722 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
2723 give_local_error(ERRMESS_IOERR
, msg
, US
"", error_rc
, data_file
,
2725 /* Does not return */
2730 /* No I/O errors were encountered while writing the data file. */
2732 DEBUG(D_receive
) debug_printf("Data file written for message %s\n", message_id
);
2735 /* If there were any bad addresses extracted by -t, or there were no recipients
2736 left after -t, send a message to the sender of this message, or write it to
2737 stderr if the error handling option is set that way. Note that there may
2738 legitimately be no recipients for an SMTP message if they have all been removed
2741 We need to rewind the data file in order to read it. In the case of no
2742 recipients or stderr error writing, throw the data file away afterwards, and
2743 exit. (This can't be SMTP, which always ensures there's at least one
2744 syntactically good recipient address.) */
2746 if (extract_recip
&& (bad_addresses
!= NULL
|| recipients_count
== 0))
2750 if (recipients_count
== 0) debug_printf("*** No recipients\n");
2751 if (bad_addresses
!= NULL
)
2753 error_block
*eblock
= bad_addresses
;
2754 debug_printf("*** Bad address(es)\n");
2755 while (eblock
!= NULL
)
2757 debug_printf(" %s: %s\n", eblock
->text1
, eblock
->text2
);
2758 eblock
= eblock
->next
;
2763 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
2765 /* If configured to send errors to the sender, but this fails, force
2766 a failure error code. We use a special one for no recipients so that it
2767 can be detected by the autoreply transport. Otherwise error_rc is set to
2768 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
2769 it is EXIT_SUCCESS. */
2771 if (error_handling
== ERRORS_SENDER
)
2773 if (!moan_to_sender(
2774 (bad_addresses
== NULL
)?
2775 (extracted_ignored
? ERRMESS_IGADDRESS
: ERRMESS_NOADDRESS
) :
2776 (recipients_list
== NULL
)? ERRMESS_BADNOADDRESS
: ERRMESS_BADADDRESS
,
2777 bad_addresses
, header_list
, data_file
, FALSE
))
2778 error_rc
= (bad_addresses
== NULL
)? EXIT_NORECIPIENTS
: EXIT_FAILURE
;
2782 if (bad_addresses
== NULL
)
2784 if (extracted_ignored
)
2785 fprintf(stderr
, "exim: all -t recipients overridden by command line\n");
2787 fprintf(stderr
, "exim: no recipients in message\n");
2791 fprintf(stderr
, "exim: invalid address%s",
2792 (bad_addresses
->next
== NULL
)? ":" : "es:\n");
2793 while (bad_addresses
!= NULL
)
2795 fprintf(stderr
, " %s: %s\n", bad_addresses
->text1
,
2796 bad_addresses
->text2
);
2797 bad_addresses
= bad_addresses
->next
;
2802 if (recipients_count
== 0 || error_handling
== ERRORS_STDERR
)
2804 Uunlink(spool_name
);
2806 exim_exit(error_rc
);
2810 /* Data file successfully written. Generate text for the Received: header by
2811 expanding the configured string, and adding a timestamp. By leaving this
2812 operation till now, we ensure that the timestamp is the time that message
2813 reception was completed. However, this is deliberately done before calling the
2814 data ACL and local_scan().
2816 This Received: header may therefore be inspected by the data ACL and by code in
2817 the local_scan() function. When they have run, we update the timestamp to be
2818 the final time of reception.
2820 If there is just one recipient, set up its value in the $received_for variable
2821 for use when we generate the Received: header.
2823 Note: the checking for too many Received: headers is handled by the delivery
2826 timestamp
= expand_string(US
"${tod_full}");
2827 if (recipients_count
== 1) received_for
= recipients_list
[0].address
;
2828 received
= expand_string(received_header_text
);
2829 received_for
= NULL
;
2831 if (received
== NULL
)
2833 Uunlink(spool_name
); /* Lose the data file */
2834 log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "Expansion of \"%s\" "
2835 "(received_header_text) failed: %s", string_printing(received_header_text
),
2836 expand_string_message
);
2839 /* The first element on the header chain is reserved for the Received header,
2840 so all we have to do is fill in the text pointer, and set the type. However, if
2841 the result of the expansion is an empty string, we leave the header marked as
2842 "old" so as to refrain from adding a Received header. */
2844 if (received
[0] == 0)
2846 received_header
->text
= string_sprintf("Received: ; %s\n", timestamp
);
2847 received_header
->type
= htype_old
;
2851 received_header
->text
= string_sprintf("%s; %s\n", received
, timestamp
);
2852 received_header
->type
= htype_received
;
2855 received_header
->slen
= Ustrlen(received_header
->text
);
2857 DEBUG(D_receive
) debug_printf(">>Generated Received: header line\n%c %s",
2858 received_header
->type
, received_header
->text
);
2860 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
2862 message_body_size
= (fstat(data_fd
, &statbuf
) == 0)?
2863 statbuf
.st_size
- SPOOL_DATA_START_OFFSET
: -1;
2865 /* If an ACL from any RCPT commands set up any warning headers to add, do so
2866 now, before running the DATA ACL. */
2868 add_acl_headers(US
"MAIL or RCPT");
2870 /* If an ACL is specified for checking things at this stage of reception of a
2871 message, run it, unless all the recipients were removed by "discard" in earlier
2872 ACLs. That is the only case in which recipients_count can be zero at this
2873 stage. Set deliver_datafile to point to the data file so that $message_body and
2874 $message_body_end can be extracted if needed. Allow $recipients in expansions.
2877 deliver_datafile
= data_fd
;
2879 if (recipients_count
== 0)
2881 blackholed_by
= recipients_discarded
? US
"MAIL ACL" : US
"RCPT ACL";
2885 enable_dollar_recipients
= TRUE
;
2887 /* Handle interactive SMTP messages */
2889 if (smtp_input
&& !smtp_batched_input
)
2892 #ifdef EXPERIMENTAL_DOMAINKEYS
2893 dk_exim_verify_finish();
2896 #ifdef WITH_CONTENT_SCAN
2897 if (acl_smtp_mime
!= NULL
&&
2898 !run_mime_acl(acl_smtp_mime
, &smtp_yield
, &smtp_reply
, &blackholed_by
))
2900 #endif /* WITH_CONTENT_SCAN */
2902 /* Check the recipients count again, as the MIME ACL might have changed
2905 if (acl_smtp_data
!= NULL
&& recipients_count
> 0)
2907 uschar
*user_msg
, *log_msg
;
2908 rc
= acl_check(ACL_WHERE_DATA
, NULL
, acl_smtp_data
, &user_msg
, &log_msg
);
2909 add_acl_headers(US
"DATA");
2912 recipients_count
= 0;
2913 blackholed_by
= US
"DATA ACL";
2914 if (log_msg
!= NULL
)
2915 blackhole_log_msg
= string_sprintf(": %s", log_msg
);
2919 Uunlink(spool_name
);
2920 #ifdef WITH_CONTENT_SCAN
2923 if (smtp_handle_acl_fail(ACL_WHERE_DATA
, rc
, user_msg
, log_msg
) != 0)
2924 smtp_yield
= FALSE
; /* No more messsages after dropped connection */
2925 smtp_reply
= US
""; /* Indicate reply already sent */
2926 message_id
[0] = 0; /* Indicate no message accepted */
2927 goto TIDYUP
; /* Skip to end of function */
2932 /* Handle non-SMTP and batch SMTP (i.e. non-interactive) messages. Note that
2933 we cannot take different actions for permanent and temporary rejections. */
2938 #ifdef WITH_CONTENT_SCAN
2939 if (acl_not_smtp_mime
!= NULL
&&
2940 !run_mime_acl(acl_not_smtp_mime
, &smtp_yield
, &smtp_reply
,
2943 #endif /* WITH_CONTENT_SCAN */
2945 if (acl_not_smtp
!= NULL
)
2947 uschar
*user_msg
, *log_msg
;
2948 rc
= acl_check(ACL_WHERE_NOTSMTP
, NULL
, acl_not_smtp
, &user_msg
, &log_msg
);
2951 recipients_count
= 0;
2952 blackholed_by
= US
"non-SMTP ACL";
2953 if (log_msg
!= NULL
)
2954 blackhole_log_msg
= string_sprintf(": %s", log_msg
);
2958 Uunlink(spool_name
);
2959 #ifdef WITH_CONTENT_SCAN
2962 log_write(0, LOG_MAIN
|LOG_REJECT
, "F=<%s> rejected by non-SMTP ACL: %s",
2963 sender_address
, log_msg
);
2964 if (user_msg
== NULL
) user_msg
= US
"local configuration problem";
2965 if (smtp_batched_input
)
2967 moan_smtp_batch(NULL
, "%d %s", 550, user_msg
);
2968 /* Does not return */
2972 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
2973 give_local_error(ERRMESS_LOCAL_ACL
, user_msg
,
2974 US
"message rejected by non-SMTP ACL: ", error_rc
, data_file
,
2976 /* Does not return */
2979 add_acl_headers(US
"non-SMTP");
2983 /* The applicable ACLs have been run */
2985 if (deliver_freeze
) frozen_by
= US
"ACL"; /* for later logging */
2986 if (queue_only_policy
) queued_by
= US
"ACL";
2988 enable_dollar_recipients
= FALSE
;
2991 #ifdef WITH_CONTENT_SCAN
2995 /* The final check on the message is to run the scan_local() function. The
2996 version supplied with Exim always accepts, but this is a hook for sysadmins to
2997 supply their own checking code. The local_scan() function is run even when all
2998 the recipients have been discarded. */
3000 lseek(data_fd
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3002 /* Arrange to catch crashes in local_scan(), so that the -D file gets
3003 deleted, and the incident gets logged. */
3005 os_non_restarting_signal(SIGSEGV
, local_scan_crash_handler
);
3006 os_non_restarting_signal(SIGFPE
, local_scan_crash_handler
);
3007 os_non_restarting_signal(SIGILL
, local_scan_crash_handler
);
3008 os_non_restarting_signal(SIGBUS
, local_scan_crash_handler
);
3010 DEBUG(D_receive
) debug_printf("calling local_scan(); timeout=%d\n",
3011 local_scan_timeout
);
3012 local_scan_data
= NULL
;
3014 os_non_restarting_signal(SIGALRM
, local_scan_timeout_handler
);
3015 if (local_scan_timeout
> 0) alarm(local_scan_timeout
);
3016 rc
= local_scan(data_fd
, &local_scan_data
);
3018 os_non_restarting_signal(SIGALRM
, sigalrm_handler
);
3020 store_pool
= POOL_MAIN
; /* In case changed */
3021 DEBUG(D_receive
) debug_printf("local_scan() returned %d %s\n", rc
,
3024 os_non_restarting_signal(SIGSEGV
, SIG_DFL
);
3025 os_non_restarting_signal(SIGFPE
, SIG_DFL
);
3026 os_non_restarting_signal(SIGILL
, SIG_DFL
);
3027 os_non_restarting_signal(SIGBUS
, SIG_DFL
);
3029 /* The length check is paranoia against some runaway code, and also because
3030 (for a success return) lines in the spool file are read into big_buffer. */
3032 if (local_scan_data
!= NULL
)
3034 int len
= Ustrlen(local_scan_data
);
3035 if (len
> LOCAL_SCAN_MAX_RETURN
) len
= LOCAL_SCAN_MAX_RETURN
;
3036 local_scan_data
= string_copyn(local_scan_data
, len
);
3039 if (rc
== LOCAL_SCAN_ACCEPT_FREEZE
)
3041 if (!deliver_freeze
) /* ACL might have already frozen */
3043 deliver_freeze
= TRUE
;
3044 deliver_frozen_at
= time(NULL
);
3045 frozen_by
= US
"local_scan()";
3047 rc
= LOCAL_SCAN_ACCEPT
;
3049 else if (rc
== LOCAL_SCAN_ACCEPT_QUEUE
)
3051 if (!queue_only_policy
) /* ACL might have already queued */
3053 queue_only_policy
= TRUE
;
3054 queued_by
= US
"local_scan()";
3056 rc
= LOCAL_SCAN_ACCEPT
;
3059 /* Message accepted: remove newlines in local_scan_data because otherwise
3060 the spool file gets corrupted. Ensure that all recipients are qualified. */
3062 if (rc
== LOCAL_SCAN_ACCEPT
)
3064 if (local_scan_data
!= NULL
)
3067 for (s
= local_scan_data
; *s
!= 0; s
++) if (*s
== '\n') *s
= ' ';
3069 for (i
= 0; i
< recipients_count
; i
++)
3071 recipient_item
*r
= recipients_list
+ i
;
3072 r
->address
= rewrite_address_qualify(r
->address
, TRUE
);
3073 if (r
->errors_to
!= NULL
)
3074 r
->errors_to
= rewrite_address_qualify(r
->errors_to
, TRUE
);
3076 if (recipients_count
== 0 && blackholed_by
== NULL
)
3077 blackholed_by
= US
"local_scan";
3080 /* Message rejected: newlines permitted in local_scan_data to generate
3081 multiline SMTP responses. */
3085 uschar
*istemp
= US
"";
3091 errmsg
= local_scan_data
;
3093 Uunlink(spool_name
); /* Cancel this message */
3097 log_write(0, LOG_MAIN
, "invalid return %d from local_scan(). Temporary "
3098 "rejection given", rc
);
3101 case LOCAL_SCAN_REJECT_NOLOGHDR
:
3102 log_extra_selector
&= ~LX_rejected_header
;
3105 case LOCAL_SCAN_REJECT
:
3107 if (errmsg
== NULL
) errmsg
= US
"Administrative prohibition";
3110 case LOCAL_SCAN_TEMPREJECT_NOLOGHDR
:
3111 log_extra_selector
&= ~LX_rejected_header
;
3114 case LOCAL_SCAN_TEMPREJECT
:
3117 if (errmsg
== NULL
) errmsg
= US
"Temporary local problem";
3118 istemp
= US
"temporarily ";
3122 s
= string_append(s
, &size
, &sptr
, 2, US
"F=",
3123 (sender_address
[0] == 0)? US
"<>" : sender_address
);
3124 s
= add_host_info_for_log(s
, &size
, &sptr
);
3127 log_write(0, LOG_MAIN
|LOG_REJECT
, "%s %srejected by local_scan(): %.256s",
3128 s
, istemp
, string_printing(errmsg
));
3132 if (!smtp_batched_input
)
3134 smtp_respond(code
, TRUE
, errmsg
);
3135 message_id
[0] = 0; /* Indicate no message accepted */
3136 smtp_reply
= US
""; /* Indicate reply already sent */
3137 goto TIDYUP
; /* Skip to end of function */
3141 moan_smtp_batch(NULL
, "%d %s", code
, errmsg
);
3142 /* Does not return */
3147 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3148 give_local_error(ERRMESS_LOCAL_SCAN
, errmsg
,
3149 US
"message rejected by local scan code: ", error_rc
, data_file
,
3151 /* Does not return */
3155 /* Reset signal handlers to ignore signals that previously would have caused
3156 the message to be abandoned. */
3158 signal(SIGTERM
, SIG_IGN
);
3159 signal(SIGINT
, SIG_IGN
);
3161 /* Ensure the first time flag is set in the newly-received message. */
3163 deliver_firsttime
= TRUE
;
3165 #ifdef EXPERIMENTAL_BRIGHTMAIL
3167 /* rewind data file */
3168 lseek(data_fd
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3169 bmi_verdicts
= bmi_process_message(header_list
, data_fd
);
3173 /* Update the timstamp in our Received: header to account for any time taken by
3174 an ACL or by local_scan(). The new time is the time that all reception
3175 processing is complete. */
3177 timestamp
= expand_string(US
"${tod_full}");
3178 tslen
= Ustrlen(timestamp
);
3180 memcpy(received_header
->text
+ received_header
->slen
- tslen
- 1,
3183 /* In MUA wrapper mode, ignore queueing actions set by ACL or local_scan() */
3187 deliver_freeze
= FALSE
;
3188 queue_only_policy
= FALSE
;
3191 /* Keep the data file open until we have written the header file, in order to
3192 hold onto the lock. In a -bh run, or if the message is to be blackholed, we
3193 don't write the header file, and we unlink the data file. If writing the header
3194 file fails, we have failed to accept this message. */
3196 if (host_checking
|| blackholed_by
!= NULL
)
3199 Uunlink(spool_name
);
3200 msg_size
= 0; /* Compute size for log line */
3201 for (h
= header_list
; h
!= NULL
; h
= h
->next
)
3202 if (h
->type
!= '*') msg_size
+= h
->slen
;
3205 /* Write the -H file */
3209 if ((msg_size
= spool_write_header(message_id
, SW_RECEIVING
, &errmsg
)) < 0)
3211 log_write(0, LOG_MAIN
, "Message abandoned: %s", errmsg
);
3212 Uunlink(spool_name
); /* Lose the data file */
3216 smtp_reply
= US
"451 Error in writing spool file";
3217 message_id
[0] = 0; /* Indicate no message accepted */
3222 fseek(data_file
, (long int)SPOOL_DATA_START_OFFSET
, SEEK_SET
);
3223 give_local_error(ERRMESS_IOERR
, errmsg
, US
"", error_rc
, data_file
,
3225 /* Does not return */
3231 /* The message has now been successfully received. */
3233 receive_messagecount
++;
3235 /* In SMTP sessions we may receive several in one connection. After each one,
3236 we wait for the clock to tick at the level of message-id granularity. This is
3237 so that the combination of time+pid is unique, even on systems where the pid
3238 can be re-used within our time interval. We can't shorten the interval without
3239 re-designing the message-id. See comments above where the message id is
3240 created. This is Something For The Future. */
3242 message_id_tv
.tv_usec
= (message_id_tv
.tv_usec
/id_resolution
) * id_resolution
;
3243 exim_wait_tick(&message_id_tv
, id_resolution
);
3245 /* Add data size to written header size. We do not count the initial file name
3246 that is in the file, but we do add one extra for the notional blank line that
3247 precedes the data. This total differs from message_size in that it include the
3248 added Received: header and any other headers that got created locally. */
3251 fstat(data_fd
, &statbuf
);
3253 msg_size
+= statbuf
.st_size
- SPOOL_DATA_START_OFFSET
+ 1;
3255 /* Generate a "message received" log entry. We do this by building up a dynamic
3256 string as required. Since we commonly want to add two items at a time, use a
3257 macro to simplify the coding. We log the arrival of a new message while the
3258 file is still locked, just in case the machine is *really* fast, and delivers
3259 it first! Include any message id that is in the message - since the syntax of a
3260 message id is actually an addr-spec, we can use the parse routine to canonicize
3265 s
= store_get(size
);
3267 s
= string_append(s
, &size
, &sptr
, 2, US
"<= ",
3268 (sender_address
[0] == 0)? US
"<>" : sender_address
);
3269 if (message_reference
!= NULL
)
3270 s
= string_append(s
, &size
, &sptr
, 2, US
" R=", message_reference
);
3272 s
= add_host_info_for_log(s
, &size
, &sptr
);
3275 if ((log_extra_selector
& LX_tls_cipher
) != 0 && tls_cipher
!= NULL
)
3276 s
= string_append(s
, &size
, &sptr
, 2, US
" X=", tls_cipher
);
3277 if ((log_extra_selector
& LX_tls_certificate_verified
) != 0 &&
3279 s
= string_append(s
, &size
, &sptr
, 2, US
" CV=",
3280 tls_certificate_verified
? "yes":"no");
3281 if ((log_extra_selector
& LX_tls_peerdn
) != 0 && tls_peerdn
!= NULL
)
3282 s
= string_append(s
, &size
, &sptr
, 3, US
" DN=\"", tls_peerdn
, US
"\"");
3285 if (sender_host_authenticated
!= NULL
)
3287 s
= string_append(s
, &size
, &sptr
, 2, US
" A=", sender_host_authenticated
);
3288 if (authenticated_id
!= NULL
)
3289 s
= string_append(s
, &size
, &sptr
, 2, US
":", authenticated_id
);
3292 sprintf(CS big_buffer
, "%d", msg_size
);
3293 s
= string_append(s
, &size
, &sptr
, 2, US
" S=", big_buffer
);
3295 /* If an addr-spec in a message-id contains a quoted string, it can contain
3296 any characters except " \ and CR and so in particular it can contain NL!
3297 Therefore, make sure we use a printing-characters only version for the log.
3298 Also, allow for domain literals in the message id. */
3300 if (msgid_header
!= NULL
)
3303 BOOL save_allow_domain_literals
= allow_domain_literals
;
3304 allow_domain_literals
= TRUE
;
3305 old_id
= parse_extract_address(Ustrchr(msgid_header
->text
, ':') + 1,
3306 &errmsg
, &start
, &end
, &domain
, FALSE
);
3307 allow_domain_literals
= save_allow_domain_literals
;
3309 s
= string_append(s
, &size
, &sptr
, 2, US
" id=", string_printing(old_id
));
3312 /* If subject logging is turned on, create suitable printing-character
3313 text. By expanding $h_subject: we make use of the MIME decoding. */
3315 if ((log_extra_selector
& LX_subject
) != 0 && subject_header
!= NULL
)
3318 uschar
*p
= big_buffer
;
3319 uschar
*ss
= expand_string(US
"$h_subject:");
3321 /* Backslash-quote any double quotes or backslashes so as to make a
3322 a C-like string, and turn any non-printers into escape sequences. */
3325 if (*ss
!= 0) for (i
= 0; i
< 100 && ss
[i
] != 0; i
++)
3327 if (ss
[i
] == '\"' || ss
[i
] == '\\') *p
++ = '\\';
3332 s
= string_append(s
, &size
, &sptr
, 2, US
" T=", string_printing(big_buffer
));
3335 /* Terminate the string: string_cat() and string_append() leave room, but do
3336 not put the zero in. */
3340 /* While writing to the log, set a flag to cause a call to receive_bomb_out()
3341 if the log cannot be opened. */
3343 receive_call_bombout
= TRUE
;
3344 log_write(0, LOG_MAIN
|
3345 (((log_extra_selector
& LX_received_recipients
) != 0)? LOG_RECIPIENTS
: 0) |
3346 (((log_extra_selector
& LX_received_sender
) != 0)? LOG_SENDER
: 0),
3348 receive_call_bombout
= FALSE
;
3350 /* Log any control actions taken by an ACL or local_scan(). */
3352 if (deliver_freeze
) log_write(0, LOG_MAIN
, "frozen by %s", frozen_by
);
3353 if (queue_only_policy
) log_write(L_delay_delivery
, LOG_MAIN
,
3354 "no immediate delivery: queued by %s", queued_by
);
3356 /* Create a message log file if message logs are being used and this message is
3357 not blackholed. Write the reception stuff to it. We used to leave message log
3358 creation until the first delivery, but this has proved confusing for somep
3361 if (message_logs
&& blackholed_by
== NULL
)
3365 sprintf(CS spool_name
, "%s/msglog/%s/%s", spool_directory
, message_subdir
,
3367 fd
= Uopen(spool_name
, O_WRONLY
|O_APPEND
|O_CREAT
, SPOOL_MODE
);
3369 if (fd
< 0 && errno
== ENOENT
)
3372 sprintf(CS temp
, "msglog/%s", message_subdir
);
3373 if (message_subdir
[0] == 0) temp
[6] = 0;
3374 (void)directory_make(spool_directory
, temp
, MSGLOG_DIRECTORY_MODE
, TRUE
);
3375 fd
= Uopen(spool_name
, O_WRONLY
|O_APPEND
|O_CREAT
, SPOOL_MODE
);
3380 log_write(0, LOG_MAIN
|LOG_PANIC
, "Couldn't open message log %s: %s",
3381 spool_name
, strerror(errno
));
3386 FILE *message_log
= fdopen(fd
, "a");
3387 if (message_log
== NULL
)
3389 log_write(0, LOG_MAIN
|LOG_PANIC
, "Couldn't fdopen message log %s: %s",
3390 spool_name
, strerror(errno
));
3395 uschar
*now
= tod_stamp(tod_log
);
3396 fprintf(message_log
, "%s Received from %s\n", now
, s
+3);
3397 if (deliver_freeze
) fprintf(message_log
, "%s frozen by %s\n", now
,
3399 if (queue_only_policy
) fprintf(message_log
,
3400 "%s no immediate delivery: queued by %s\n", now
, queued_by
);
3401 fclose(message_log
);
3406 store_reset(s
); /* The store for the main log message can be reused */
3408 /* If the message is frozen, and freeze_tell is set, do the telling. */
3410 if (deliver_freeze
&& freeze_tell
!= NULL
&& freeze_tell
[0] != 0)
3412 moan_tell_someone(freeze_tell
, NULL
, US
"Message frozen on arrival",
3413 "Message %s was frozen on arrival by %s.\nThe sender is <%s>.\n",
3414 message_id
, frozen_by
, sender_address
);
3418 /* Either a message has been successfully received and written to the two spool
3419 files, or an error in writing the spool has occurred for an SMTP message, or
3420 an SMTP message has been rejected because of a bad sender. (For a non-SMTP
3421 message we will have already given up because there's no point in carrying on!)
3422 In either event, we must now close (and thereby unlock) the data file. In the
3423 successful case, this leaves the message on the spool, ready for delivery. In
3424 the error case, the spool file will be deleted. Then tidy up store, interact
3425 with an SMTP call if necessary, and return.
3427 A fflush() was done earlier in the expectation that any write errors on the
3428 data file will be flushed(!) out thereby. Nevertheless, it is theoretically
3429 possible for fclose() to fail - but what to do? What has happened to the lock
3433 process_info
[process_info_len
] = 0; /* Remove message id */
3434 if (data_file
!= NULL
) fclose(data_file
); /* Frees the lock */
3436 /* Now reset signal handlers to their defaults */
3438 signal(SIGTERM
, SIG_DFL
);
3439 signal(SIGINT
, SIG_DFL
);
3441 /* Tell an SMTP caller the state of play, and arrange to return the SMTP return
3442 value, which defaults TRUE - meaning there may be more incoming messages from
3443 this connection. For non-SMTP callers (where there is only ever one message),
3444 the default is FALSE. */
3450 /* Handle interactive SMTP callers. After several kinds of error, smtp_reply
3451 is set to the response. However, after an ACL error or local_scan() error,
3452 the response has already been sent, and smtp_reply is an empty string to
3455 if (!smtp_batched_input
)
3457 if (smtp_reply
== NULL
)
3460 smtp_respond(550,TRUE
,fake_reject_text
);
3462 smtp_printf("250 OK id=%s\r\n", message_id
);
3465 "\n**** SMTP testing: that is not a real message id!\n\n");
3467 else if (smtp_reply
[0] != 0)
3469 if (fake_reject
&& (smtp_reply
[0] == '2'))
3470 smtp_respond(550,TRUE
,fake_reject_text
);
3472 smtp_printf("%.1024s\r\n", smtp_reply
);
3476 /* For batched SMTP, generate an error message on failure, and do
3477 nothing on success. The function moan_smtp_batch() does not return -
3478 it exits from the program with a non-zero return code. */
3480 else if (smtp_reply
!= NULL
) moan_smtp_batch(NULL
, "%s", smtp_reply
);
3484 /* If blackholing, we can immediately log this message's sad fate. The data
3485 file has already been unlinked, and the header file was never written to disk.
3486 We must now indicate that nothing was received, to prevent a delivery from
3489 if (blackholed_by
!= NULL
)
3491 uschar
*detail
= (local_scan_data
!= NULL
)?
3492 string_printing(local_scan_data
) :
3493 string_sprintf("(%s discarded recipients)", blackholed_by
);
3494 log_write(0, LOG_MAIN
, "=> blackhole %s%s", detail
, blackhole_log_msg
);
3495 log_write(0, LOG_MAIN
, "Completed");
3499 /* Reset headers so that logging of rejects for a subsequent message doesn't
3500 include them. It is also important to set header_last = NULL before exiting
3501 from this function, as this prevents certain rewrites that might happen during
3502 subsequent verifying (of another incoming message) from trying to add headers
3503 when they shouldn't. */
3505 header_list
= header_last
= NULL
;
3507 return yield
; /* TRUE if more messages (SMTP only) */
3510 /* End of receive.c */