1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2016 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* Functions concerned with verifying things. The original code for callout
9 caching was contributed by Kevin Fleming (but I hacked it around a bit). */
13 #include "transports/smtp.h"
15 #define CUTTHROUGH_CMD_TIMEOUT 30 /* timeout for cutthrough-routing calls */
16 #define CUTTHROUGH_DATA_TIMEOUT 60 /* timeout for cutthrough-routing calls */
17 static smtp_outblock ctblock
;
18 uschar ctbuffer
[8192];
21 /* Structure for caching DNSBL lookups */
23 typedef struct dnsbl_cache_block
{
32 /* Anchor for DNSBL cache */
34 static tree_node
*dnsbl_cache
= NULL
;
37 /* Bits for match_type in one_check_dnsbl() */
42 static uschar
cutthrough_response(char, uschar
**);
45 /*************************************************
46 * Retrieve a callout cache record *
47 *************************************************/
49 /* If a record exists, check whether it has expired.
52 dbm_file an open hints file
54 type "address" or "domain"
55 positive_expire expire time for positive records
56 negative_expire expire time for negative records
58 Returns: the cache record if a non-expired one exists, else NULL
61 static dbdata_callout_cache
*
62 get_callout_cache_record(open_db
*dbm_file
, const uschar
*key
, uschar
*type
,
63 int positive_expire
, int negative_expire
)
68 dbdata_callout_cache
*cache_record
;
70 cache_record
= dbfn_read_with_length(dbm_file
, key
, &length
);
72 if (cache_record
== NULL
)
74 HDEBUG(D_verify
) debug_printf("callout cache: no %s record found for %s\n", type
, key
);
78 /* We treat a record as "negative" if its result field is not positive, or if
79 it is a domain record and the postmaster field is negative. */
81 negative
= cache_record
->result
!= ccache_accept
||
82 (type
[0] == 'd' && cache_record
->postmaster_result
== ccache_reject
);
83 expire
= negative
? negative_expire
: positive_expire
;
86 if (now
- cache_record
->time_stamp
> expire
)
88 HDEBUG(D_verify
) debug_printf("callout cache: %s record expired for %s\n", type
, key
);
92 /* If this is a non-reject domain record, check for the obsolete format version
93 that doesn't have the postmaster and random timestamps, by looking at the
94 length. If so, copy it to a new-style block, replicating the record's
95 timestamp. Then check the additional timestamps. (There's no point wasting
96 effort if connections are rejected.) */
98 if (type
[0] == 'd' && cache_record
->result
!= ccache_reject
)
100 if (length
== sizeof(dbdata_callout_cache_obs
))
102 dbdata_callout_cache
*new = store_get(sizeof(dbdata_callout_cache
));
103 memcpy(new, cache_record
, length
);
104 new->postmaster_stamp
= new->random_stamp
= new->time_stamp
;
108 if (now
- cache_record
->postmaster_stamp
> expire
)
109 cache_record
->postmaster_result
= ccache_unknown
;
111 if (now
- cache_record
->random_stamp
> expire
)
112 cache_record
->random_result
= ccache_unknown
;
115 HDEBUG(D_verify
) debug_printf("callout cache: found %s record for %s\n", type
, key
);
121 /*************************************************
122 * Do callout verification for an address *
123 *************************************************/
125 /* This function is called from verify_address() when the address has routed to
126 a host list, and a callout has been requested. Callouts are expensive; that is
127 why a cache is used to improve the efficiency.
130 addr the address that's been routed
131 host_list the list of hosts to try
132 tf the transport feedback block
134 ifstring "interface" option from transport, or NULL
135 portstring "port" option from transport, or NULL
136 protocolstring "protocol" option from transport, or NULL
137 callout the per-command callout timeout
138 callout_overall the overall callout timeout (if < 0 use 4*callout)
139 callout_connect the callout connection timeout (if < 0 use callout)
140 options the verification options - these bits are used:
141 vopt_is_recipient => this is a recipient address
142 vopt_callout_no_cache => don't use callout cache
143 vopt_callout_fullpm => if postmaster check, do full one
144 vopt_callout_random => do the "random" thing
145 vopt_callout_recipsender => use real sender for recipient
146 vopt_callout_recippmaster => use postmaster for recipient
147 se_mailfrom MAIL FROM address for sender verify; NULL => ""
148 pm_mailfrom if non-NULL, do the postmaster check with this sender
150 Returns: OK/FAIL/DEFER
154 do_callout(address_item
*addr
, host_item
*host_list
, transport_feedback
*tf
,
155 int callout
, int callout_overall
, int callout_connect
, int options
,
156 uschar
*se_mailfrom
, uschar
*pm_mailfrom
)
159 int old_domain_cache_result
= ccache_accept
;
162 uschar
*from_address
;
163 uschar
*random_local_part
= NULL
;
164 const uschar
*save_deliver_domain
= deliver_domain
;
165 uschar
**failure_ptr
= options
& vopt_is_recipient
166 ? &recipient_verify_failure
: &sender_verify_failure
;
168 open_db
*dbm_file
= NULL
;
169 dbdata_callout_cache new_domain_record
;
170 dbdata_callout_cache_address new_address_record
;
172 time_t callout_start_time
;
173 uschar peer_offered
= 0;
175 new_domain_record
.result
= ccache_unknown
;
176 new_domain_record
.postmaster_result
= ccache_unknown
;
177 new_domain_record
.random_result
= ccache_unknown
;
179 memset(&new_address_record
, 0, sizeof(new_address_record
));
181 /* For a recipient callout, the key used for the address cache record must
182 include the sender address if we are using the real sender in the callout,
183 because that may influence the result of the callout. */
185 address_key
= addr
->address
;
188 if (options
& vopt_is_recipient
)
190 if (options
& vopt_callout_recipsender
)
192 address_key
= string_sprintf("%s/<%s>", addr
->address
, sender_address
);
193 from_address
= sender_address
;
194 if (cutthrough
.delivery
) options
|= vopt_callout_no_cache
;
196 else if (options
& vopt_callout_recippmaster
)
198 address_key
= string_sprintf("%s/<postmaster@%s>", addr
->address
,
199 qualify_domain_sender
);
200 from_address
= string_sprintf("postmaster@%s", qualify_domain_sender
);
204 /* For a sender callout, we must adjust the key if the mailfrom address is not
209 from_address
= (se_mailfrom
== NULL
)? US
"" : se_mailfrom
;
210 if (from_address
[0] != 0)
211 address_key
= string_sprintf("%s/<%s>", addr
->address
, from_address
);
214 /* Open the callout cache database, it it exists, for reading only at this
215 stage, unless caching has been disabled. */
217 if (options
& vopt_callout_no_cache
)
219 HDEBUG(D_verify
) debug_printf("callout cache: disabled by no_cache\n");
221 else if ((dbm_file
= dbfn_open(US
"callout", O_RDWR
, &dbblock
, FALSE
)) == NULL
)
223 HDEBUG(D_verify
) debug_printf("callout cache: not available\n");
226 /* If a cache database is available see if we can avoid the need to do an
227 actual callout by making use of previously-obtained data. */
231 dbdata_callout_cache_address
*cache_address_record
;
232 dbdata_callout_cache
*cache_record
= get_callout_cache_record(dbm_file
,
233 addr
->domain
, US
"domain",
234 callout_cache_domain_positive_expire
,
235 callout_cache_domain_negative_expire
);
237 /* If an unexpired cache record was found for this domain, see if the callout
238 process can be short-circuited. */
242 /* In most cases, if an early command (up to and including MAIL FROM:<>)
243 was rejected, there is no point carrying on. The callout fails. However, if
244 we are doing a recipient verification with use_sender or use_postmaster
245 set, a previous failure of MAIL FROM:<> doesn't count, because this time we
246 will be using a non-empty sender. We have to remember this situation so as
247 not to disturb the cached domain value if this whole verification succeeds
248 (we don't want it turning into "accept"). */
250 old_domain_cache_result
= cache_record
->result
;
252 if (cache_record
->result
== ccache_reject
||
253 (*from_address
== 0 && cache_record
->result
== ccache_reject_mfnull
))
255 setflag(addr
, af_verify_nsfail
);
257 debug_printf("callout cache: domain gave initial rejection, or "
258 "does not accept HELO or MAIL FROM:<>\n");
259 setflag(addr
, af_verify_nsfail
);
260 addr
->user_message
= US
"(result of an earlier callout reused).";
262 *failure_ptr
= US
"mail";
266 /* If a previous check on a "random" local part was accepted, we assume
267 that the server does not do any checking on local parts. There is therefore
268 no point in doing the callout, because it will always be successful. If a
269 random check previously failed, arrange not to do it again, but preserve
270 the data in the new record. If a random check is required but hasn't been
271 done, skip the remaining cache processing. */
273 if (options
& vopt_callout_random
) switch(cache_record
->random_result
)
277 debug_printf("callout cache: domain accepts random addresses\n");
278 goto END_CALLOUT
; /* Default yield is OK */
282 debug_printf("callout cache: domain rejects random addresses\n");
283 options
&= ~vopt_callout_random
;
284 new_domain_record
.random_result
= ccache_reject
;
285 new_domain_record
.random_stamp
= cache_record
->random_stamp
;
290 debug_printf("callout cache: need to check random address handling "
291 "(not cached or cache expired)\n");
295 /* If a postmaster check is requested, but there was a previous failure,
296 there is again no point in carrying on. If a postmaster check is required,
297 but has not been done before, we are going to have to do a callout, so skip
298 remaining cache processing. */
302 if (cache_record
->postmaster_result
== ccache_reject
)
304 setflag(addr
, af_verify_pmfail
);
306 debug_printf("callout cache: domain does not accept "
307 "RCPT TO:<postmaster@domain>\n");
309 *failure_ptr
= US
"postmaster";
310 setflag(addr
, af_verify_pmfail
);
311 addr
->user_message
= US
"(result of earlier verification reused).";
314 if (cache_record
->postmaster_result
== ccache_unknown
)
317 debug_printf("callout cache: need to check RCPT "
318 "TO:<postmaster@domain> (not cached or cache expired)\n");
322 /* If cache says OK, set pm_mailfrom NULL to prevent a redundant
323 postmaster check if the address itself has to be checked. Also ensure
324 that the value in the cache record is preserved (with its old timestamp).
327 HDEBUG(D_verify
) debug_printf("callout cache: domain accepts RCPT "
328 "TO:<postmaster@domain>\n");
330 new_domain_record
.postmaster_result
= ccache_accept
;
331 new_domain_record
.postmaster_stamp
= cache_record
->postmaster_stamp
;
335 /* We can't give a result based on information about the domain. See if there
336 is an unexpired cache record for this specific address (combined with the
337 sender address if we are doing a recipient callout with a non-empty sender).
340 cache_address_record
= (dbdata_callout_cache_address
*)
341 get_callout_cache_record(dbm_file
,
342 address_key
, US
"address",
343 callout_cache_positive_expire
,
344 callout_cache_negative_expire
);
346 if (cache_address_record
)
348 if (cache_address_record
->result
== ccache_accept
)
351 debug_printf("callout cache: address record is positive\n");
356 debug_printf("callout cache: address record is negative\n");
357 addr
->user_message
= US
"Previous (cached) callout verification failure";
358 *failure_ptr
= US
"recipient";
364 /* Close the cache database while we actually do the callout for real. */
367 dbfn_close(dbm_file
);
371 if (!addr
->transport
)
373 HDEBUG(D_verify
) debug_printf("cannot callout via null transport\n");
375 else if (Ustrcmp(addr
->transport
->driver_name
, "smtp") != 0)
376 log_write(0, LOG_MAIN
|LOG_PANIC
|LOG_CONFIG_FOR
, "callout transport '%s': %s is non-smtp",
377 addr
->transport
->name
, addr
->transport
->driver_name
);
380 smtp_transport_options_block
*ob
=
381 (smtp_transport_options_block
*)addr
->transport
->options_block
;
383 /* The information wasn't available in the cache, so we have to do a real
384 callout and save the result in the cache for next time, unless no_cache is set,
385 or unless we have a previously cached negative random result. If we are to test
386 with a random local part, ensure that such a local part is available. If not,
387 log the fact, but carry on without randomming. */
389 if (options
& vopt_callout_random
&& callout_random_local_part
!= NULL
)
390 if (!(random_local_part
= expand_string(callout_random_local_part
)))
391 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to expand "
392 "callout_random_local_part: %s", expand_string_message
);
394 /* Default the connect and overall callout timeouts if not set, and record the
395 time we are starting so that we can enforce it. */
397 if (callout_overall
< 0) callout_overall
= 4 * callout
;
398 if (callout_connect
< 0) callout_connect
= callout
;
399 callout_start_time
= time(NULL
);
401 /* Before doing a real callout, if this is an SMTP connection, flush the SMTP
402 output because a callout might take some time. When PIPELINING is active and
403 there are many recipients, the total time for doing lots of callouts can add up
404 and cause the client to time out. So in this case we forgo the PIPELINING
407 if (smtp_out
&& !disable_callout_flush
) mac_smtp_fflush();
409 /* cutthrough-multi: if a nonfirst rcpt has the same routing as the first,
410 and we are holding a cutthrough conn open, we can just append the rcpt to
411 that conn for verification purposes (and later delivery also). Simplest
412 coding means skipping this whole loop and doing the append separately.
414 We will need to remember it has been appended so that rcpt-acl tail code
415 can do it there for the non-rcpt-verify case. For this we keep an addresscount.
418 /* Can we re-use an open cutthrough connection? */
419 if ( cutthrough
.fd
>= 0
420 && (options
& (vopt_callout_recipsender
| vopt_callout_recippmaster
))
421 == vopt_callout_recipsender
422 && !random_local_part
426 if (addr
->transport
== cutthrough
.addr
.transport
)
427 for (host
= host_list
; host
; host
= host
->next
)
428 if (Ustrcmp(host
->address
, cutthrough
.host
.address
) == 0)
431 uschar
*interface
= NULL
; /* Outgoing interface to use; NULL => any */
434 deliver_host
= host
->name
;
435 deliver_host_address
= host
->address
;
436 deliver_host_port
= host
->port
;
437 deliver_domain
= addr
->domain
;
438 transport_name
= addr
->transport
->name
;
440 host_af
= (Ustrchr(host
->address
, ':') == NULL
)? AF_INET
:AF_INET6
;
442 if (!smtp_get_interface(tf
->interface
, host_af
, addr
, &interface
,
444 !smtp_get_port(tf
->port
, addr
, &port
, US
"callout"))
445 log_write(0, LOG_MAIN
|LOG_PANIC
, "<%s>: %s", addr
->address
,
448 if ( ( interface
== cutthrough
.interface
450 && cutthrough
.interface
451 && Ustrcmp(interface
, cutthrough
.interface
) == 0
453 && port
== cutthrough
.host
.port
456 uschar
* resp
= NULL
;
458 /* Match! Send the RCPT TO, append the addr, set done */
460 smtp_write_command(&ctblock
, FALSE
, "RCPT TO:<%.1000s>\r\n",
461 transport_rcpt_address(addr
,
462 (addr
->transport
== NULL
)? FALSE
:
463 addr
->transport
->rcpt_include_affixes
)) >= 0 &&
464 cutthrough_response('2', &resp
) == '2';
466 /* This would go horribly wrong if a callout fail was ignored by ACL.
467 We punt by abandoning cutthrough on a reject, like the
472 address_item
* na
= store_get(sizeof(address_item
));
473 *na
= cutthrough
.addr
;
474 cutthrough
.addr
= *addr
;
475 cutthrough
.addr
.host_used
= &cutthrough
.host
;
476 cutthrough
.addr
.next
= na
;
482 cancel_cutthrough_connection("recipient rejected");
483 if (!resp
|| errno
== ETIMEDOUT
)
485 HDEBUG(D_verify
) debug_printf("SMTP timeout\n");
490 Ustrcpy(resp
, US
"connection dropped");
493 string_sprintf("response to \"%s\" from %s [%s] was: %s",
494 big_buffer
, host
->name
, host
->address
,
495 string_printing(resp
));
498 string_sprintf("Callout verification failed:\n%s", resp
);
500 /* Hard rejection ends the process */
502 if (resp
[0] == '5') /* Address rejected */
513 cancel_cutthrough_connection("incompatible connection");
516 /* Now make connections to the hosts and do real callouts. The list of hosts
517 is passed in as an argument. */
519 for (host
= host_list
; host
&& !done
; host
= host
->next
)
521 smtp_inblock inblock
;
522 smtp_outblock outblock
;
525 BOOL send_quit
= TRUE
;
526 uschar
*active_hostname
= smtp_active_hostname
;
530 BOOL suppress_tls
= FALSE
;
531 uschar
*interface
= NULL
; /* Outgoing interface to use; NULL => any */
532 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
535 dns_answer tlsa_dnsa
;
537 uschar inbuffer
[4096];
538 uschar outbuffer
[1024];
539 uschar responsebuffer
[4096];
542 clearflag(addr
, af_verify_pmfail
); /* postmaster callout flag */
543 clearflag(addr
, af_verify_nsfail
); /* null sender callout flag */
545 /* Skip this host if we don't have an IP address for it. */
549 DEBUG(D_verify
) debug_printf("no IP address for host name %s: skipping\n",
554 /* Check the overall callout timeout */
556 if (time(NULL
) - callout_start_time
>= callout_overall
)
558 HDEBUG(D_verify
) debug_printf("overall timeout for callout exceeded\n");
562 /* Set IPv4 or IPv6 */
564 host_af
= Ustrchr(host
->address
, ':') == NULL
? AF_INET
: AF_INET6
;
566 /* Expand and interpret the interface and port strings. The latter will not
567 be used if there is a host-specific port (e.g. from a manualroute router).
568 This has to be delayed till now, because they may expand differently for
569 different hosts. If there's a failure, log it, but carry on with the
572 deliver_host
= host
->name
;
573 deliver_host_address
= host
->address
;
574 deliver_host_port
= host
->port
;
575 deliver_domain
= addr
->domain
;
576 transport_name
= addr
->transport
->name
;
578 if ( !smtp_get_interface(tf
->interface
, host_af
, addr
, &interface
,
580 || !smtp_get_port(tf
->port
, addr
, &port
, US
"callout")
582 log_write(0, LOG_MAIN
|LOG_PANIC
, "<%s>: %s", addr
->address
,
585 /* Set HELO string according to the protocol */
586 lmtp
= Ustrcmp(tf
->protocol
, "lmtp") == 0;
587 smtps
= Ustrcmp(tf
->protocol
, "smtps") == 0;
590 HDEBUG(D_verify
) debug_printf("interface=%s port=%d\n", interface
, port
);
592 /* Set up the buffer for reading SMTP response packets. */
594 inblock
.buffer
= inbuffer
;
595 inblock
.buffersize
= sizeof(inbuffer
);
596 inblock
.ptr
= inbuffer
;
597 inblock
.ptrend
= inbuffer
;
599 /* Set up the buffer for holding SMTP commands while pipelining */
601 outblock
.buffer
= outbuffer
;
602 outblock
.buffersize
= sizeof(outbuffer
);
603 outblock
.ptr
= outbuffer
;
604 outblock
.cmd_count
= 0;
605 outblock
.authenticating
= FALSE
;
607 /* Connect to the host; on failure, just loop for the next one, but we
608 set the error for the last one. Use the callout_connect timeout. */
610 tls_retry_connection
:
612 /* Reset the parameters of a TLS session */
613 tls_out
.cipher
= tls_out
.peerdn
= tls_out
.peercert
= NULL
;
615 inblock
.sock
= outblock
.sock
=
616 smtp_connect(host
, host_af
, port
, interface
, callout_connect
,
618 if (inblock
.sock
< 0)
620 addr
->message
= string_sprintf("could not connect to %s [%s]: %s",
621 host
->name
, host
->address
, strerror(errno
));
622 transport_name
= NULL
;
623 deliver_host
= deliver_host_address
= NULL
;
624 deliver_domain
= save_deliver_domain
;
628 #if defined(SUPPORT_TLS) && defined(EXPERIMENTAL_DANE)
632 tls_out
.dane_verified
= FALSE
;
633 tls_out
.tlsa_usage
= 0;
636 verify_check_given_host(&ob
->hosts_require_dane
, host
) == OK
;
638 if (host
->dnssec
== DS_YES
)
641 || verify_check_given_host(&ob
->hosts_try_dane
, host
) == OK
644 if ((rc
= tlsa_lookup(host
, &tlsa_dnsa
, dane_required
)) != OK
)
649 else if (dane_required
)
651 log_write(0, LOG_MAIN
, "DANE error: %s lookup not DNSSEC", host
->name
);
656 ob
->tls_tempfail_tryclear
= FALSE
;
660 /* Expand the helo_data string to find the host name to use. */
664 uschar
* s
= expand_string(tf
->helo_data
);
666 log_write(0, LOG_MAIN
|LOG_PANIC
, "<%s>: failed to expand transport's "
667 "helo_data value for callout: %s", addr
->address
,
668 expand_string_message
);
669 else active_hostname
= s
;
672 /* Wait for initial response, and send HELO. The smtp_write_command()
673 function leaves its command in big_buffer. This is used in error responses.
674 Initialize it in case the connection is rejected. */
676 Ustrcpy(big_buffer
, "initial connection");
678 /* Unless ssl-on-connect, wait for the initial greeting */
682 if (!smtps
|| (smtps
&& tls_out
.active
>= 0))
685 if (!(done
= smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
), '2', callout
)))
686 goto RESPONSE_FAILED
;
688 #ifndef DISABLE_EVENT
689 lookup_dnssec_authenticated
= host
->dnssec
==DS_YES
? US
"yes"
690 : host
->dnssec
==DS_NO
? US
"no" : NULL
;
691 if (event_raise(addr
->transport
->event_action
,
692 US
"smtp:connect", responsebuffer
))
694 lookup_dnssec_authenticated
= NULL
;
695 /* Logging? Debug? */
696 goto RESPONSE_FAILED
;
698 lookup_dnssec_authenticated
= NULL
;
702 /* Not worth checking greeting line for ESMTP support */
703 if (!(esmtp
= verify_check_given_host(&ob
->hosts_avoid_esmtp
, host
) != OK
))
705 debug_printf("not sending EHLO (host matches hosts_avoid_esmtp)\n");
710 if (smtps
&& tls_out
.active
< 0) /* ssl-on-connect, first pass */
712 peer_offered
&= ~PEER_OFFERED_TLS
;
713 ob
->tls_tempfail_tryclear
= FALSE
;
715 else /* all other cases */
720 if (!(done
= smtp_write_command(&outblock
, FALSE
, "%s %s\r\n",
721 !esmtp
? "HELO" : lmtp
? "LHLO" : "EHLO", active_hostname
) >= 0))
723 if (!smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
), '2', callout
))
725 if (errno
!= 0 || responsebuffer
[0] == 0 || lmtp
|| !esmtp
|| tls_out
.active
>= 0)
728 goto RESPONSE_FAILED
;
731 peer_offered
&= ~PEER_OFFERED_TLS
;
734 goto esmtp_retry
; /* fallback to HELO */
737 /* Set tls_offered if the response to EHLO specifies support for STARTTLS. */
740 ? ehlo_response(responsebuffer
, sizeof(responsebuffer
),
741 (!suppress_tls
&& tls_out
.active
< 0 ? PEER_OFFERED_TLS
: 0)
745 | (addr
->prop
.utf8_msg
&& !addr
->prop
.utf8_downcvt
746 ? PEER_OFFERED_UTF8
: 0)
751 /* only care about SIZE if we have size from inbound */
752 | (message_size
> 0 && ob
->size_addition
>= 0
753 ? PEER_OFFERED_SIZE
: 0)
758 size_str
= peer_offered
& PEER_OFFERED_SIZE
759 ? string_sprintf(" SIZE=%d", message_size
+ ob
->size_addition
) : US
"";
762 smtp_peer_options
|= peer_offered
& PEER_OFFERED_TLS
;
765 /* If TLS is available on this connection attempt to
766 start up a TLS session, unless the host is in hosts_avoid_tls. If successful,
767 send another EHLO - the server may give a different answer in secure mode. We
768 use a separate buffer for reading the response to STARTTLS so that if it is
769 negative, the original EHLO data is available for subsequent analysis, should
770 the client not be required to use TLS. If the response is bad, copy the buffer
771 for error analysis. */
774 if ( peer_offered
& PEER_OFFERED_TLS
775 && verify_check_given_host(&ob
->hosts_avoid_tls
, host
) != OK
776 && verify_check_given_host(&ob
->hosts_verify_avoid_tls
, host
) != OK
779 uschar buffer2
[4096];
781 && !(done
= smtp_write_command(&outblock
, FALSE
, "STARTTLS\r\n") >= 0))
784 /* If there is an I/O error, transmission of this message is deferred. If
785 there is a temporary rejection of STARRTLS and tls_tempfail_tryclear is
786 false, we also defer. However, if there is a temporary rejection of STARTTLS
787 and tls_tempfail_tryclear is true, or if there is an outright rejection of
788 STARTTLS, we carry on. This means we will try to send the message in clear,
789 unless the host is in hosts_require_tls (tested below). */
791 if (!smtps
&& !smtp_read_response(&inblock
, buffer2
, sizeof(buffer2
), '2',
792 ob
->command_timeout
))
796 || buffer2
[0] == '4' && !ob
->tls_tempfail_tryclear
799 Ustrncpy(responsebuffer
, buffer2
, sizeof(responsebuffer
));
801 goto RESPONSE_FAILED
;
805 /* STARTTLS accepted or ssl-on-connect: try to negotiate a TLS session. */
808 int oldtimeout
= ob
->command_timeout
;
812 ob
->command_timeout
= callout
;
813 rc
= tls_client_start(inblock
.sock
, host
, addr
, addr
->transport
814 # ifdef EXPERIMENTAL_DANE
815 , dane
? &tlsa_dnsa
: NULL
818 ob
->command_timeout
= oldtimeout
;
820 /* TLS negotiation failed; give an error. Try in clear on a new
821 connection, if the options permit it for this host. */
826 (void)close(inblock
.sock
);
827 # ifndef DISABLE_EVENT
828 (void) event_raise(addr
->transport
->event_action
,
829 US
"tcp:close", NULL
);
831 if ( ob
->tls_tempfail_tryclear
833 && verify_check_given_host(&ob
->hosts_require_tls
, host
) != OK
836 log_write(0, LOG_MAIN
, "TLS session failure:"
837 " delivering unencrypted to %s [%s] (not in hosts_require_tls)",
838 host
->name
, host
->address
);
840 goto tls_retry_connection
;
844 /*save_errno = ERRNO_TLSFAILURE;*/
845 /*message = US"failure while setting up TLS session";*/
851 /* TLS session is set up. Copy info for logging. */
852 addr
->cipher
= tls_out
.cipher
;
853 addr
->peerdn
= tls_out
.peerdn
;
855 /* For SMTPS we need to wait for the initial OK response, then do HELO. */
857 goto smtps_redo_greeting
;
859 /* For STARTTLS we need to redo EHLO */
864 /* If the host is required to use a secure channel, ensure that we have one. */
865 if (tls_out
.active
< 0)
867 # ifdef EXPERIMENTAL_DANE
870 verify_check_given_host(&ob
->hosts_require_tls
, host
) == OK
873 /*save_errno = ERRNO_TLSREQUIRED;*/
874 log_write(0, LOG_MAIN
,
875 "H=%s [%s]: a TLS session is required for this host, but %s",
876 host
->name
, host
->address
,
877 peer_offered
& PEER_OFFERED_TLS
878 ? "an attempt to start TLS failed"
879 : "the server did not offer TLS support");
884 #endif /*SUPPORT_TLS*/
886 done
= TRUE
; /* so far so good; have response to HELO */
888 /* For now, transport_filter by cutthrough-delivery is not supported */
889 /* Need proper integration with the proper transport mechanism. */
890 if (cutthrough
.delivery
)
895 if (addr
->transport
->filter_command
)
897 cutthrough
.delivery
= FALSE
;
898 HDEBUG(D_acl
|D_v
) debug_printf("Cutthrough cancelled by presence of transport filter\n");
901 else if ((s
= ob
->dkim
.dkim_domain
) && (s
= expand_string(s
)) && *s
)
903 cutthrough
.delivery
= FALSE
;
904 HDEBUG(D_acl
|D_v
) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
913 /* Clear down of the TLS, SMTP and TCP layers on error is handled below. */
915 /* Failure to accept HELO is cached; this blocks the whole domain for all
916 senders. I/O errors and defer responses are not cached. */
920 *failure_ptr
= US
"mail"; /* At or before MAIL */
921 if (errno
== 0 && responsebuffer
[0] == '5')
923 setflag(addr
, af_verify_nsfail
);
924 new_domain_record
.result
= ccache_reject
;
929 else if ( addr
->prop
.utf8_msg
930 && !addr
->prop
.utf8_downcvt
931 && !(peer_offered
& PEER_OFFERED_UTF8
)
934 HDEBUG(D_acl
|D_v
) debug_printf("utf8 required but not offered\n");
935 errno
= ERRNO_UTF8_FWD
;
936 setflag(addr
, af_verify_nsfail
);
939 else if ( addr
->prop
.utf8_msg
940 && (addr
->prop
.utf8_downcvt
|| !(peer_offered
& PEER_OFFERED_UTF8
))
941 && (setflag(addr
, af_utf8_downcvt
),
942 from_address
= string_address_utf8_to_alabel(from_address
,
947 errno
= ERRNO_EXPANDFAIL
;
948 setflag(addr
, af_verify_nsfail
);
953 /* If we haven't authenticated, but are required to, give up. */
956 else done
= smtp_auth(responsebuffer
, sizeof(responsebuffer
),
957 addr
, host
, ob
, esmtp
, &inblock
, &outblock
) == OK
&&
959 /* Copy AUTH info for logging */
960 ( (addr
->authenticator
= client_authenticator
),
961 (addr
->auth_id
= client_authenticated_id
),
963 /* Build a mail-AUTH string (re-using responsebuffer for convenience */
964 !smtp_mail_auth_str(responsebuffer
, sizeof(responsebuffer
), addr
, ob
)
967 ( (addr
->auth_sndr
= client_authenticated_sender
),
969 /* Send the MAIL command */
970 (smtp_write_command(&outblock
, FALSE
,
972 addr
->prop
.utf8_msg
&& !addr
->prop
.utf8_downcvt
973 ? "MAIL FROM:<%s>%s%s SMTPUTF8\r\n"
976 "MAIL FROM:<%s>%s%s\r\n",
977 from_address
, responsebuffer
, size_str
) >= 0)
980 smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
),
983 deliver_host
= deliver_host_address
= NULL
;
984 deliver_domain
= save_deliver_domain
;
986 /* If the host does not accept MAIL FROM:<>, arrange to cache this
987 information, but again, don't record anything for an I/O error or a defer. Do
988 not cache rejections of MAIL when a non-empty sender has been used, because
989 that blocks the whole domain for all senders. */
993 *failure_ptr
= US
"mail"; /* At or before MAIL */
994 if (errno
== 0 && responsebuffer
[0] == '5')
996 setflag(addr
, af_verify_nsfail
);
997 if (from_address
[0] == 0)
998 new_domain_record
.result
= ccache_reject_mfnull
;
1002 /* Otherwise, proceed to check a "random" address (if required), then the
1003 given address, and the postmaster address (if required). Between each check,
1004 issue RSET, because some servers accept only one recipient after MAIL
1007 Before doing this, set the result in the domain cache record to "accept",
1008 unless its previous value was ccache_reject_mfnull. In that case, the domain
1009 rejects MAIL FROM:<> and we want to continue to remember that. When that is
1010 the case, we have got here only in the case of a recipient verification with
1011 a non-null sender. */
1015 const uschar
* rcpt_domain
= addr
->domain
;
1018 uschar
* errstr
= NULL
;
1019 if ( testflag(addr
, af_utf8_downcvt
)
1020 && (rcpt_domain
= string_domain_utf8_to_alabel(rcpt_domain
,
1024 addr
->message
= errstr
;
1025 errno
= ERRNO_EXPANDFAIL
;
1026 setflag(addr
, af_verify_nsfail
);
1028 rcpt_domain
= US
""; /*XXX errorhandling! */
1032 new_domain_record
.result
=
1033 (old_domain_cache_result
== ccache_reject_mfnull
)?
1034 ccache_reject_mfnull
: ccache_accept
;
1036 /* Do the random local part check first */
1038 if (random_local_part
!= NULL
)
1040 uschar randombuffer
[1024];
1042 smtp_write_command(&outblock
, FALSE
,
1043 "RCPT TO:<%.1000s@%.1000s>\r\n", random_local_part
,
1044 rcpt_domain
) >= 0 &&
1045 smtp_read_response(&inblock
, randombuffer
,
1046 sizeof(randombuffer
), '2', callout
);
1048 /* Remember when we last did a random test */
1050 new_domain_record
.random_stamp
= time(NULL
);
1052 /* If accepted, we aren't going to do any further tests below. */
1055 new_domain_record
.random_result
= ccache_accept
;
1057 /* Otherwise, cache a real negative response, and get back to the right
1058 state to send RCPT. Unless there's some problem such as a dropped
1059 connection, we expect to succeed, because the commands succeeded above.
1060 However, some servers drop the connection after responding to an
1061 invalid recipient, so on (any) error we drop and remake the connection.
1064 else if (errno
== 0)
1066 /* This would be ok for 1st rcpt a cutthrough, but no way to
1067 handle a subsequent. So refuse to support any */
1068 cancel_cutthrough_connection("random-recipient");
1070 if (randombuffer
[0] == '5')
1071 new_domain_record
.random_result
= ccache_reject
;
1074 smtp_write_command(&outblock
, FALSE
, "RSET\r\n") >= 0 &&
1075 smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
),
1078 smtp_write_command(&outblock
, FALSE
,
1080 addr
->prop
.utf8_msg
&& !addr
->prop
.utf8_downcvt
1081 ? "MAIL FROM:<%s> SMTPUTF8\r\n"
1084 "MAIL FROM:<%s>\r\n",
1085 from_address
) >= 0 &&
1086 smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
),
1092 debug_printf("problem after random/rset/mfrom; reopen conn\n");
1093 random_local_part
= NULL
;
1095 tls_close(FALSE
, TRUE
);
1097 (void)close(inblock
.sock
);
1098 #ifndef DISABLE_EVENT
1099 (void) event_raise(addr
->transport
->event_action
,
1100 US
"tcp:close", NULL
);
1102 goto tls_retry_connection
;
1105 else done
= FALSE
; /* Some timeout/connection problem */
1106 } /* Random check */
1108 /* If the host is accepting all local parts, as determined by the "random"
1109 check, we don't need to waste time doing any further checking. */
1111 if (new_domain_record
.random_result
!= ccache_accept
&& done
)
1113 /* Get the rcpt_include_affixes flag from the transport if there is one,
1114 but assume FALSE if there is not. */
1116 uschar
* rcpt
= transport_rcpt_address(addr
,
1117 addr
->transport
? addr
->transport
->rcpt_include_affixes
: FALSE
);
1120 /*XXX should the conversion be moved into transport_rcpt_address() ? */
1121 uschar
* dummy_errstr
= NULL
;
1122 if ( testflag(addr
, af_utf8_downcvt
)
1123 && (rcpt
= string_address_utf8_to_alabel(rcpt
, &dummy_errstr
),
1127 errno
= ERRNO_EXPANDFAIL
;
1128 *failure_ptr
= US
"recipient";
1135 smtp_write_command(&outblock
, FALSE
, "RCPT TO:<%.1000s>\r\n",
1137 smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
),
1141 new_address_record
.result
= ccache_accept
;
1142 else if (errno
== 0 && responsebuffer
[0] == '5')
1144 *failure_ptr
= US
"recipient";
1145 new_address_record
.result
= ccache_reject
;
1148 /* Do postmaster check if requested; if a full check is required, we
1149 check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
1151 if (done
&& pm_mailfrom
!= NULL
)
1153 /* Could possibly shift before main verify, just above, and be ok
1154 for cutthrough. But no way to handle a subsequent rcpt, so just
1156 cancel_cutthrough_connection("postmaster verify");
1157 HDEBUG(D_acl
|D_v
) debug_printf("Cutthrough cancelled by presence of postmaster verify\n");
1160 smtp_write_command(&outblock
, FALSE
, "RSET\r\n") >= 0 &&
1161 smtp_read_response(&inblock
, responsebuffer
,
1162 sizeof(responsebuffer
), '2', callout
) &&
1164 smtp_write_command(&outblock
, FALSE
,
1165 "MAIL FROM:<%s>\r\n", pm_mailfrom
) >= 0 &&
1166 smtp_read_response(&inblock
, responsebuffer
,
1167 sizeof(responsebuffer
), '2', callout
) &&
1169 /* First try using the current domain */
1172 smtp_write_command(&outblock
, FALSE
,
1173 "RCPT TO:<postmaster@%.1000s>\r\n", rcpt_domain
) >= 0 &&
1174 smtp_read_response(&inblock
, responsebuffer
,
1175 sizeof(responsebuffer
), '2', callout
)
1180 /* If that doesn't work, and a full check is requested,
1181 try without the domain. */
1184 (options
& vopt_callout_fullpm
) != 0 &&
1185 smtp_write_command(&outblock
, FALSE
,
1186 "RCPT TO:<postmaster>\r\n") >= 0 &&
1187 smtp_read_response(&inblock
, responsebuffer
,
1188 sizeof(responsebuffer
), '2', callout
)
1191 /* Sort out the cache record */
1193 new_domain_record
.postmaster_stamp
= time(NULL
);
1196 new_domain_record
.postmaster_result
= ccache_accept
;
1197 else if (errno
== 0 && responsebuffer
[0] == '5')
1199 *failure_ptr
= US
"postmaster";
1200 setflag(addr
, af_verify_pmfail
);
1201 new_domain_record
.postmaster_result
= ccache_reject
;
1204 } /* Random not accepted */
1205 } /* MAIL FROM: accepted */
1207 /* For any failure of the main check, other than a negative response, we just
1208 close the connection and carry on. We can identify a negative response by the
1209 fact that errno is zero. For I/O errors it will be non-zero
1211 Set up different error texts for logging and for sending back to the caller
1212 as an SMTP response. Log in all cases, using a one-line format. For sender
1213 callouts, give a full response to the caller, but for recipient callouts,
1214 don't give the IP address because this may be an internal host whose identity
1215 is not to be widely broadcast. */
1219 if (errno
== ETIMEDOUT
)
1221 HDEBUG(D_verify
) debug_printf("SMTP timeout\n");
1225 else if (errno
== ERRNO_UTF8_FWD
)
1227 extern int acl_where
; /* src/acl.c */
1229 addr
->message
= string_sprintf(
1230 "response to \"%s\" from %s [%s] did not include SMTPUTF8",
1231 big_buffer
, host
->name
, host
->address
);
1232 addr
->user_message
= acl_where
== ACL_WHERE_RCPT
1233 ? US
"533 mailbox name not allowed"
1234 : US
"550 mailbox unavailable";
1239 else if (errno
== 0)
1241 if (*responsebuffer
== 0) Ustrcpy(responsebuffer
, US
"connection dropped");
1244 string_sprintf("response to \"%s\" from %s [%s] was: %s",
1245 big_buffer
, host
->name
, host
->address
,
1246 string_printing(responsebuffer
));
1248 addr
->user_message
= options
& vopt_is_recipient
1249 ? string_sprintf("Callout verification failed:\n%s", responsebuffer
)
1250 : string_sprintf("Called: %s\nSent: %s\nResponse: %s",
1251 host
->address
, big_buffer
, responsebuffer
);
1253 /* Hard rejection ends the process */
1255 if (responsebuffer
[0] == '5') /* Address rejected */
1263 /* End the SMTP conversation and close the connection. */
1265 /* Cutthrough - on a successfull connect and recipient-verify with
1266 use-sender and we are 1st rcpt and have no cutthrough conn so far
1267 here is where we want to leave the conn open */
1268 if ( cutthrough
.delivery
1272 && (options
& (vopt_callout_recipsender
|vopt_callout_recippmaster
|vopt_success_on_redirect
))
1273 == vopt_callout_recipsender
1274 && !random_local_part
1276 && cutthrough
.fd
< 0
1280 HDEBUG(D_acl
|D_v
) debug_printf("holding verify callout open for cutthrough delivery\n");
1282 cutthrough
.fd
= outblock
.sock
; /* We assume no buffer in use in the outblock */
1283 cutthrough
.nrcpt
= 1;
1284 cutthrough
.interface
= interface
;
1285 cutthrough
.host
= *host
;
1286 cutthrough
.addr
= *addr
; /* Save the address_item for later logging */
1287 cutthrough
.addr
.next
= NULL
;
1288 cutthrough
.addr
.host_used
= &cutthrough
.host
;
1290 *(cutthrough
.addr
.parent
= store_get(sizeof(address_item
))) =
1292 ctblock
.buffer
= ctbuffer
;
1293 ctblock
.buffersize
= sizeof(ctbuffer
);
1294 ctblock
.ptr
= ctbuffer
;
1295 /* ctblock.cmd_count = 0; ctblock.authenticating = FALSE; */
1296 ctblock
.sock
= cutthrough
.fd
;
1300 /* Ensure no cutthrough on multiple address verifies */
1301 if (options
& vopt_callout_recipsender
)
1302 cancel_cutthrough_connection("not usable for cutthrough");
1304 (void) smtp_write_command(&outblock
, FALSE
, "QUIT\r\n");
1307 tls_close(FALSE
, TRUE
);
1309 (void)close(inblock
.sock
);
1310 #ifndef DISABLE_EVENT
1311 (void) event_raise(addr
->transport
->event_action
, US
"tcp:close", NULL
);
1315 } /* Loop through all hosts, while !done */
1318 /* If we get here with done == TRUE, a successful callout happened, and yield
1319 will be set OK or FAIL according to the response to the RCPT command.
1320 Otherwise, we looped through the hosts but couldn't complete the business.
1321 However, there may be domain-specific information to cache in both cases.
1323 The value of the result field in the new_domain record is ccache_unknown if
1324 there was an error before or with MAIL FROM:, and errno was not zero,
1325 implying some kind of I/O error. We don't want to write the cache in that case.
1326 Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
1328 if ( !(options
& vopt_callout_no_cache
)
1329 && new_domain_record
.result
!= ccache_unknown
)
1331 if ((dbm_file
= dbfn_open(US
"callout", O_RDWR
|O_CREAT
, &dbblock
, FALSE
))
1334 HDEBUG(D_verify
) debug_printf("callout cache: not available\n");
1338 (void)dbfn_write(dbm_file
, addr
->domain
, &new_domain_record
,
1339 (int)sizeof(dbdata_callout_cache
));
1340 HDEBUG(D_verify
) debug_printf("wrote callout cache domain record for %s:\n"
1341 " result=%d postmaster=%d random=%d\n",
1343 new_domain_record
.result
,
1344 new_domain_record
.postmaster_result
,
1345 new_domain_record
.random_result
);
1349 /* If a definite result was obtained for the callout, cache it unless caching
1354 if ( !(options
& vopt_callout_no_cache
)
1355 && new_address_record
.result
!= ccache_unknown
)
1358 dbm_file
= dbfn_open(US
"callout", O_RDWR
|O_CREAT
, &dbblock
, FALSE
);
1361 HDEBUG(D_verify
) debug_printf("no callout cache available\n");
1365 (void)dbfn_write(dbm_file
, address_key
, &new_address_record
,
1366 (int)sizeof(dbdata_callout_cache_address
));
1367 HDEBUG(D_verify
) debug_printf("wrote %s callout cache address record for %s\n",
1368 new_address_record
.result
== ccache_accept
? "positive" : "negative",
1374 /* Failure to connect to any host, or any response other than 2xx or 5xx is a
1375 temporary error. If there was only one host, and a response was received, leave
1376 it alone if supplying details. Otherwise, give a generic response. */
1380 uschar
* dullmsg
= string_sprintf("Could not complete %s verify callout",
1381 options
& vopt_is_recipient
? "recipient" : "sender");
1384 if (host_list
->next
|| !addr
->message
)
1385 addr
->message
= dullmsg
;
1387 addr
->user_message
= smtp_return_error_details
1388 ? string_sprintf("%s for <%s>.\n"
1389 "The mail server(s) for the domain may be temporarily unreachable, or\n"
1390 "they may be permanently unreachable from this server. In the latter case,\n%s",
1391 dullmsg
, addr
->address
,
1392 options
& vopt_is_recipient
1393 ? "the address will never be accepted."
1394 : "you need to change the address or create an MX record for its domain\n"
1395 "if it is supposed to be generally accessible from the Internet.\n"
1396 "Talk to your mail administrator for details.")
1399 /* Force a specific error code */
1401 addr
->basic_errno
= ERRNO_CALLOUTDEFER
;
1404 /* Come here from within the cache-reading code on fast-track exit. */
1407 if (dbm_file
) dbfn_close(dbm_file
);
1413 /* Called after recipient-acl to get a cutthrough connection open when
1414 one was requested and a recipient-verify wasn't subsequently done.
1417 open_cutthrough_connection( address_item
* addr
)
1422 /* Use a recipient-verify-callout to set up the cutthrough connection. */
1423 /* We must use a copy of the address for verification, because it might
1427 HDEBUG(D_acl
) debug_printf("----------- %s cutthrough setup ------------\n",
1428 rcpt_count
> 1 ? "more" : "start");
1429 rc
= verify_address(&addr2
, NULL
,
1430 vopt_is_recipient
| vopt_callout_recipsender
| vopt_callout_no_cache
,
1431 CUTTHROUGH_CMD_TIMEOUT
, -1, -1,
1433 addr
->message
= addr2
.message
;
1434 addr
->user_message
= addr2
.user_message
;
1435 HDEBUG(D_acl
) debug_printf("----------- end cutthrough setup ------------\n");
1441 /* Send given number of bytes from the buffer */
1443 cutthrough_send(int n
)
1445 if(cutthrough
.fd
< 0)
1450 (tls_out
.active
== cutthrough
.fd
) ? tls_write(FALSE
, ctblock
.buffer
, n
) :
1452 send(cutthrough
.fd
, ctblock
.buffer
, n
, 0) > 0
1455 transport_count
+= n
;
1456 ctblock
.ptr
= ctblock
.buffer
;
1460 HDEBUG(D_transport
|D_acl
) debug_printf("cutthrough_send failed: %s\n", strerror(errno
));
1467 _cutthrough_puts(uschar
* cp
, int n
)
1471 if(ctblock
.ptr
>= ctblock
.buffer
+ctblock
.buffersize
)
1472 if(!cutthrough_send(ctblock
.buffersize
))
1475 *ctblock
.ptr
++ = *cp
++;
1480 /* Buffered output of counted data block. Return boolean success */
1482 cutthrough_puts(uschar
* cp
, int n
)
1484 if (cutthrough
.fd
< 0) return TRUE
;
1485 if (_cutthrough_puts(cp
, n
)) return TRUE
;
1486 cancel_cutthrough_connection("transmit failed");
1492 _cutthrough_flush_send(void)
1494 int n
= ctblock
.ptr
-ctblock
.buffer
;
1497 if(!cutthrough_send(n
))
1503 /* Send out any bufferred output. Return boolean success. */
1505 cutthrough_flush_send(void)
1507 if (_cutthrough_flush_send()) return TRUE
;
1508 cancel_cutthrough_connection("transmit failed");
1514 cutthrough_put_nl(void)
1516 return cutthrough_puts(US
"\r\n", 2);
1520 /* Get and check response from cutthrough target */
1522 cutthrough_response(char expect
, uschar
** copy
)
1524 smtp_inblock inblock
;
1525 uschar inbuffer
[4096];
1526 uschar responsebuffer
[4096];
1528 inblock
.buffer
= inbuffer
;
1529 inblock
.buffersize
= sizeof(inbuffer
);
1530 inblock
.ptr
= inbuffer
;
1531 inblock
.ptrend
= inbuffer
;
1532 inblock
.sock
= cutthrough
.fd
;
1533 /* this relies on (inblock.sock == tls_out.active) */
1534 if(!smtp_read_response(&inblock
, responsebuffer
, sizeof(responsebuffer
), expect
, CUTTHROUGH_DATA_TIMEOUT
))
1535 cancel_cutthrough_connection("target timeout on read");
1540 *copy
= cp
= string_copy(responsebuffer
);
1541 /* Trim the trailing end of line */
1542 cp
+= Ustrlen(responsebuffer
);
1543 if(cp
> *copy
&& cp
[-1] == '\n') *--cp
= '\0';
1544 if(cp
> *copy
&& cp
[-1] == '\r') *--cp
= '\0';
1547 return responsebuffer
[0];
1551 /* Negotiate dataphase with the cutthrough target, returning success boolean */
1553 cutthrough_predata(void)
1555 if(cutthrough
.fd
< 0)
1558 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf(" SMTP>> DATA\n");
1559 cutthrough_puts(US
"DATA\r\n", 6);
1560 cutthrough_flush_send();
1562 /* Assume nothing buffered. If it was it gets ignored. */
1563 return cutthrough_response('3', NULL
) == '3';
1567 /* fd and tctx args only to match write_chunk() */
1569 cutthrough_write_chunk(int fd
, transport_ctx
* tctx
, uschar
* s
, int len
)
1572 while(s
&& (s2
= Ustrchr(s
, '\n')))
1574 if(!cutthrough_puts(s
, s2
-s
) || !cutthrough_put_nl())
1582 /* Buffered send of headers. Return success boolean. */
1583 /* Expands newlines to wire format (CR,NL). */
1584 /* Also sends header-terminating blank line. */
1586 cutthrough_headers_send(void)
1590 if(cutthrough
.fd
< 0)
1593 /* We share a routine with the mainline transport to handle header add/remove/rewrites,
1594 but having a separate buffered-output function (for now)
1596 HDEBUG(D_acl
) debug_printf("----------- start cutthrough headers send -----------\n");
1598 tctx
.tblock
= cutthrough
.addr
.transport
;
1599 tctx
.addr
= &cutthrough
.addr
;
1600 tctx
.check_string
= US
".";
1601 tctx
.escape_string
= US
"..";
1602 tctx
.options
= topt_use_crlf
;
1604 if (!transport_headers_send(cutthrough
.fd
, &tctx
, &cutthrough_write_chunk
))
1607 HDEBUG(D_acl
) debug_printf("----------- done cutthrough headers send ------------\n");
1613 close_cutthrough_connection(const char * why
)
1615 if(cutthrough
.fd
>= 0)
1617 /* We could be sending this after a bunch of data, but that is ok as
1618 the only way to cancel the transfer in dataphase is to drop the tcp
1619 conn before the final dot.
1621 ctblock
.ptr
= ctbuffer
;
1622 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf(" SMTP>> QUIT\n");
1623 _cutthrough_puts(US
"QUIT\r\n", 6); /* avoid recursion */
1624 _cutthrough_flush_send();
1625 /* No wait for response */
1628 tls_close(FALSE
, TRUE
);
1630 (void)close(cutthrough
.fd
);
1632 HDEBUG(D_acl
) debug_printf("----------- cutthrough shutdown (%s) ------------\n", why
);
1634 ctblock
.ptr
= ctbuffer
;
1638 cancel_cutthrough_connection(const char * why
)
1640 close_cutthrough_connection(why
);
1641 cutthrough
.delivery
= FALSE
;
1647 /* Have senders final-dot. Send one to cutthrough target, and grab the response.
1648 Log an OK response as a transmission.
1649 Close the connection.
1650 Return smtp response-class digit.
1653 cutthrough_finaldot(void)
1656 address_item
* addr
;
1657 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf(" SMTP>> .\n");
1659 /* Assume data finshed with new-line */
1660 if( !cutthrough_puts(US
".", 1)
1661 || !cutthrough_put_nl()
1662 || !cutthrough_flush_send()
1664 return cutthrough
.addr
.message
;
1666 res
= cutthrough_response('2', &cutthrough
.addr
.message
);
1667 for (addr
= &cutthrough
.addr
; addr
; addr
= addr
->next
)
1669 addr
->message
= cutthrough
.addr
.message
;
1673 delivery_log(LOG_MAIN
, addr
, (int)'>', NULL
);
1674 close_cutthrough_connection("delivered");
1678 delivery_log(LOG_MAIN
, addr
, 0,
1679 US
"tmp-reject from cutthrough after DATA:");
1683 delivery_log(LOG_MAIN
|LOG_REJECT
, addr
, 0,
1684 US
"rejected after DATA:");
1691 return cutthrough
.addr
.message
;
1696 /*************************************************
1697 * Copy error to toplevel address *
1698 *************************************************/
1700 /* This function is used when a verify fails or defers, to ensure that the
1701 failure or defer information is in the original toplevel address. This applies
1702 when an address is redirected to a single new address, and the failure or
1703 deferral happens to the child address.
1706 vaddr the verify address item
1707 addr the final address item
1710 Returns: the value of YIELD
1714 copy_error(address_item
*vaddr
, address_item
*addr
, int yield
)
1718 vaddr
->message
= addr
->message
;
1719 vaddr
->user_message
= addr
->user_message
;
1720 vaddr
->basic_errno
= addr
->basic_errno
;
1721 vaddr
->more_errno
= addr
->more_errno
;
1722 vaddr
->prop
.address_data
= addr
->prop
.address_data
;
1723 copyflag(vaddr
, addr
, af_pass_message
);
1731 /**************************************************
1732 * printf that automatically handles TLS if needed *
1733 ***************************************************/
1735 /* This function is used by verify_address() as a substitute for all fprintf()
1736 calls; a direct fprintf() will not produce output in a TLS SMTP session, such
1737 as a response to an EXPN command. smtp_in.c makes smtp_printf available but
1738 that assumes that we always use the smtp_out FILE* when not using TLS or the
1739 ssl buffer when we are. Instead we take a FILE* parameter and check to see if
1740 that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular
1744 f the candidate FILE* to write to
1745 format format string
1746 ... optional arguments
1752 static void PRINTF_FUNCTION(2,3)
1753 respond_printf(FILE *f
, const char *format
, ...)
1757 va_start(ap
, format
);
1758 if (smtp_out
&& (f
== smtp_out
))
1759 smtp_vprintf(format
, ap
);
1761 vfprintf(f
, format
, ap
);
1767 /*************************************************
1768 * Verify an email address *
1769 *************************************************/
1771 /* This function is used both for verification (-bv and at other times) and
1772 address testing (-bt), which is indicated by address_test_mode being set.
1775 vaddr contains the address to verify; the next field in this block
1777 f if not NULL, write the result to this file
1778 options various option bits:
1779 vopt_fake_sender => this sender verify is not for the real
1780 sender (it was verify=sender=xxxx or an address from a
1781 header line) - rewriting must not change sender_address
1782 vopt_is_recipient => this is a recipient address, otherwise
1783 it's a sender address - this affects qualification and
1784 rewriting and messages from callouts
1785 vopt_qualify => qualify an unqualified address; else error
1786 vopt_expn => called from SMTP EXPN command
1787 vopt_success_on_redirect => when a new address is generated
1788 the verification instantly succeeds
1790 These ones are used by do_callout() -- the options variable
1793 vopt_callout_fullpm => if postmaster check, do full one
1794 vopt_callout_no_cache => don't use callout cache
1795 vopt_callout_random => do the "random" thing
1796 vopt_callout_recipsender => use real sender for recipient
1797 vopt_callout_recippmaster => use postmaster for recipient
1799 callout if > 0, specifies that callout is required, and gives timeout
1800 for individual commands
1801 callout_overall if > 0, gives overall timeout for the callout function;
1802 if < 0, a default is used (see do_callout())
1803 callout_connect the connection timeout for callouts
1804 se_mailfrom when callout is requested to verify a sender, use this
1805 in MAIL FROM; NULL => ""
1806 pm_mailfrom when callout is requested, if non-NULL, do the postmaster
1807 thing and use this as the sender address (may be "")
1809 routed if not NULL, set TRUE if routing succeeded, so we can
1810 distinguish between routing failed and callout failed
1812 Returns: OK address verified
1813 FAIL address failed to verify
1814 DEFER can't tell at present
1818 verify_address(address_item
*vaddr
, FILE *f
, int options
, int callout
,
1819 int callout_overall
, int callout_connect
, uschar
*se_mailfrom
,
1820 uschar
*pm_mailfrom
, BOOL
*routed
)
1823 BOOL full_info
= (f
== NULL
)? FALSE
: (debug_selector
!= 0);
1824 BOOL expn
= (options
& vopt_expn
) != 0;
1825 BOOL success_on_redirect
= (options
& vopt_success_on_redirect
) != 0;
1828 int verify_type
= expn
? v_expn
:
1829 address_test_mode
? v_none
:
1830 options
& vopt_is_recipient
? v_recipient
: v_sender
;
1831 address_item
*addr_list
;
1832 address_item
*addr_new
= NULL
;
1833 address_item
*addr_remote
= NULL
;
1834 address_item
*addr_local
= NULL
;
1835 address_item
*addr_succeed
= NULL
;
1836 uschar
**failure_ptr
= options
& vopt_is_recipient
1837 ? &recipient_verify_failure
: &sender_verify_failure
;
1838 uschar
*ko_prefix
, *cr
;
1839 uschar
*address
= vaddr
->address
;
1840 uschar
*save_sender
;
1841 uschar null_sender
[] = { 0 }; /* Ensure writeable memory */
1843 /* Clear, just in case */
1845 *failure_ptr
= NULL
;
1847 /* Set up a prefix and suffix for error message which allow us to use the same
1848 output statements both in EXPN mode (where an SMTP response is needed) and when
1849 debugging with an output file. */
1853 ko_prefix
= US
"553 ";
1856 else ko_prefix
= cr
= US
"";
1858 /* Add qualify domain if permitted; otherwise an unqualified address fails. */
1860 if (parse_find_at(address
) == NULL
)
1862 if ((options
& vopt_qualify
) == 0)
1865 respond_printf(f
, "%sA domain is required for \"%s\"%s\n",
1866 ko_prefix
, address
, cr
);
1867 *failure_ptr
= US
"qualify";
1870 address
= rewrite_address_qualify(address
, options
& vopt_is_recipient
);
1875 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1876 debug_printf("%s %s\n", address_test_mode
? "Testing" : "Verifying", address
);
1879 /* Rewrite and report on it. Clear the domain and local part caches - these
1880 may have been set by domains and local part tests during an ACL. */
1882 if (global_rewrite_rules
!= NULL
)
1884 uschar
*old
= address
;
1885 address
= rewrite_address(address
, options
& vopt_is_recipient
, FALSE
,
1886 global_rewrite_rules
, rewrite_existflags
);
1889 for (i
= 0; i
< (MAX_NAMED_LIST
* 2)/32; i
++) vaddr
->localpart_cache
[i
] = 0;
1890 for (i
= 0; i
< (MAX_NAMED_LIST
* 2)/32; i
++) vaddr
->domain_cache
[i
] = 0;
1891 if (f
!= NULL
&& !expn
) fprintf(f
, "Address rewritten as: %s\n", address
);
1895 /* If this is the real sender address, we must update sender_address at
1896 this point, because it may be referred to in the routers. */
1898 if ((options
& (vopt_fake_sender
|vopt_is_recipient
)) == 0)
1899 sender_address
= address
;
1901 /* If the address was rewritten to <> no verification can be done, and we have
1902 to return OK. This rewriting is permitted only for sender addresses; for other
1903 addresses, such rewriting fails. */
1905 if (address
[0] == 0) return OK
;
1907 /* Flip the legacy TLS-related variables over to the outbound set in case
1908 they're used in the context of a transport used by verification. Reset them
1909 at exit from this routine (so no returns allowed from here on). */
1911 tls_modify_variables(&tls_out
);
1913 /* Save a copy of the sender address for re-instating if we change it to <>
1914 while verifying a sender address (a nice bit of self-reference there). */
1916 save_sender
= sender_address
;
1918 /* Observability variable for router/transport use */
1920 verify_mode
= options
& vopt_is_recipient
? US
"R" : US
"S";
1922 /* Update the address structure with the possibly qualified and rewritten
1923 address. Set it up as the starting address on the chain of new addresses. */
1925 vaddr
->address
= address
;
1928 /* We need a loop, because an address can generate new addresses. We must also
1929 cope with generated pipes and files at the top level. (See also the code and
1930 comment in deliver.c.) However, it is usually the case that the router for
1931 user's .forward files has its verify flag turned off.
1933 If an address generates more than one child, the loop is used only when
1934 full_info is set, and this can only be set locally. Remote enquiries just get
1935 information about the top level address, not anything that it generated. */
1940 address_item
*addr
= addr_new
;
1942 addr_new
= addr
->next
;
1947 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1948 debug_printf("Considering %s\n", addr
->address
);
1951 /* Handle generated pipe, file or reply addresses. We don't get these
1952 when handling EXPN, as it does only one level of expansion. */
1954 if (testflag(addr
, af_pfr
))
1961 if (addr
->address
[0] == '>')
1963 allow
= testflag(addr
, af_allow_reply
);
1964 fprintf(f
, "%s -> mail %s", addr
->parent
->address
, addr
->address
+ 1);
1968 allow
= (addr
->address
[0] == '|')?
1969 testflag(addr
, af_allow_pipe
) : testflag(addr
, af_allow_file
);
1970 fprintf(f
, "%s -> %s", addr
->parent
->address
, addr
->address
);
1973 if (addr
->basic_errno
== ERRNO_BADTRANSPORT
)
1974 fprintf(f
, "\n*** Error in setting up pipe, file, or autoreply:\n"
1975 "%s\n", addr
->message
);
1977 fprintf(f
, "\n transport = %s\n", addr
->transport
->name
);
1979 fprintf(f
, " *** forbidden ***\n");
1984 /* Just in case some router parameter refers to it. */
1986 return_path
= addr
->prop
.errors_address
1987 ? addr
->prop
.errors_address
: sender_address
;
1989 /* Split the address into domain and local part, handling the %-hack if
1990 necessary, and then route it. While routing a sender address, set
1991 $sender_address to <> because that is what it will be if we were trying to
1992 send a bounce to the sender. */
1994 if (routed
) *routed
= FALSE
;
1995 if ((rc
= deliver_split_address(addr
)) == OK
)
1997 if (!(options
& vopt_is_recipient
)) sender_address
= null_sender
;
1998 rc
= route_address(addr
, &addr_local
, &addr_remote
, &addr_new
,
1999 &addr_succeed
, verify_type
);
2000 sender_address
= save_sender
; /* Put back the real sender */
2003 /* If routing an address succeeded, set the flag that remembers, for use when
2004 an ACL cached a sender verify (in case a callout fails). Then if routing set
2005 up a list of hosts or the transport has a host list, and the callout option
2006 is set, and we aren't in a host checking run, do the callout verification,
2007 and set another flag that notes that a callout happened. */
2011 if (routed
) *routed
= TRUE
;
2014 transport_instance
* tp
;
2015 host_item
* host_list
= addr
->host_list
;
2017 /* Make up some data for use in the case where there is no remote
2020 transport_feedback tf
= {
2021 NULL
, /* interface (=> any) */
2022 US
"smtp", /* port */
2023 US
"smtp", /* protocol */
2025 US
"$smtp_active_hostname", /* helo_data */
2026 FALSE
, /* hosts_override */
2027 FALSE
, /* hosts_randomize */
2028 FALSE
, /* gethostbyname */
2029 TRUE
, /* qualify_single */
2030 FALSE
/* search_parents */
2033 /* If verification yielded a remote transport, we want to use that
2034 transport's options, so as to mimic what would happen if we were really
2035 sending a message to this address. */
2037 if ((tp
= addr
->transport
) && !tp
->info
->local
)
2039 (void)(tp
->setup
)(tp
, addr
, &tf
, 0, 0, NULL
);
2041 /* If the transport has hosts and the router does not, or if the
2042 transport is configured to override the router's hosts, we must build a
2043 host list of the transport's hosts, and find the IP addresses */
2045 if (tf
.hosts
&& (!host_list
|| tf
.hosts_override
))
2048 const uschar
*save_deliver_domain
= deliver_domain
;
2049 uschar
*save_deliver_localpart
= deliver_localpart
;
2051 host_list
= NULL
; /* Ignore the router's hosts */
2053 deliver_domain
= addr
->domain
;
2054 deliver_localpart
= addr
->local_part
;
2055 s
= expand_string(tf
.hosts
);
2056 deliver_domain
= save_deliver_domain
;
2057 deliver_localpart
= save_deliver_localpart
;
2061 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to expand list of hosts "
2062 "\"%s\" in %s transport for callout: %s", tf
.hosts
,
2063 tp
->name
, expand_string_message
);
2068 host_item
*host
, *nexthost
;
2069 host_build_hostlist(&host_list
, s
, tf
.hosts_randomize
);
2071 /* Just ignore failures to find a host address. If we don't manage
2072 to find any addresses, the callout will defer. Note that more than
2073 one address may be found for a single host, which will result in
2074 additional host items being inserted into the chain. Hence we must
2075 save the next host first. */
2077 flags
= HOST_FIND_BY_A
;
2078 if (tf
.qualify_single
) flags
|= HOST_FIND_QUALIFY_SINGLE
;
2079 if (tf
.search_parents
) flags
|= HOST_FIND_SEARCH_PARENTS
;
2081 for (host
= host_list
; host
; host
= nexthost
)
2083 nexthost
= host
->next
;
2084 if (tf
.gethostbyname
||
2085 string_is_ip_address(host
->name
, NULL
) != 0)
2086 (void)host_find_byname(host
, NULL
, flags
, NULL
, TRUE
);
2089 dnssec_domains
* dnssec_domains
= NULL
;
2090 if (Ustrcmp(tp
->driver_name
, "smtp") == 0)
2092 smtp_transport_options_block
* ob
=
2093 (smtp_transport_options_block
*) tp
->options_block
;
2094 dnssec_domains
= &ob
->dnssec
;
2097 (void)host_find_bydns(host
, NULL
, flags
, NULL
, NULL
, NULL
,
2098 dnssec_domains
, NULL
, NULL
);
2105 /* Can only do a callout if we have at least one host! If the callout
2106 fails, it will have set ${sender,recipient}_verify_failure. */
2110 HDEBUG(D_verify
) debug_printf("Attempting full verification using callout\n");
2111 if (host_checking
&& !host_checking_callout
)
2114 debug_printf("... callout omitted by default when host testing\n"
2115 "(Use -bhc if you want the callouts to happen.)\n");
2120 deliver_set_expansions(addr
);
2122 rc
= do_callout(addr
, host_list
, &tf
, callout
, callout_overall
,
2123 callout_connect
, options
, se_mailfrom
, pm_mailfrom
);
2128 HDEBUG(D_verify
) debug_printf("Cannot do callout: neither router nor "
2129 "transport provided a host list\n");
2134 /* Otherwise, any failure is a routing failure */
2136 else *failure_ptr
= US
"route";
2138 /* A router may return REROUTED if it has set up a child address as a result
2139 of a change of domain name (typically from widening). In this case we always
2140 want to continue to verify the new child. */
2142 if (rc
== REROUTED
) continue;
2144 /* Handle hard failures */
2151 address_item
*p
= addr
->parent
;
2153 respond_printf(f
, "%s%s %s", ko_prefix
,
2154 full_info
? addr
->address
: address
,
2155 address_test_mode
? "is undeliverable" : "failed to verify");
2156 if (!expn
&& admin_user
)
2158 if (addr
->basic_errno
> 0)
2159 respond_printf(f
, ": %s", strerror(addr
->basic_errno
));
2161 respond_printf(f
, ": %s", addr
->message
);
2164 /* Show parents iff doing full info */
2166 if (full_info
) while (p
)
2168 respond_printf(f
, "%s\n <-- %s", cr
, p
->address
);
2171 respond_printf(f
, "%s\n", cr
);
2173 cancel_cutthrough_connection("routing hard fail");
2177 yield
= copy_error(vaddr
, addr
, FAIL
);
2185 else if (rc
== DEFER
)
2190 address_item
*p
= addr
->parent
;
2191 respond_printf(f
, "%s%s cannot be resolved at this time", ko_prefix
,
2192 full_info
? addr
->address
: address
);
2193 if (!expn
&& admin_user
)
2195 if (addr
->basic_errno
> 0)
2196 respond_printf(f
, ": %s", strerror(addr
->basic_errno
));
2198 respond_printf(f
, ": %s", addr
->message
);
2199 else if (addr
->basic_errno
<= 0)
2200 respond_printf(f
, ": unknown error");
2203 /* Show parents iff doing full info */
2205 if (full_info
) while (p
)
2207 respond_printf(f
, "%s\n <-- %s", cr
, p
->address
);
2210 respond_printf(f
, "%s\n", cr
);
2212 cancel_cutthrough_connection("routing soft fail");
2216 yield
= copy_error(vaddr
, addr
, DEFER
);
2219 if (yield
== OK
) yield
= DEFER
;
2222 /* If we are handling EXPN, we do not want to continue to route beyond
2223 the top level (whose address is in "address"). */
2227 uschar
*ok_prefix
= US
"250-";
2230 if (!addr_local
&& !addr_remote
)
2231 respond_printf(f
, "250 mail to <%s> is discarded\r\n", address
);
2233 respond_printf(f
, "250 <%s>\r\n", address
);
2237 address_item
*addr2
= addr_new
;
2238 addr_new
= addr2
->next
;
2239 if (!addr_new
) ok_prefix
= US
"250 ";
2240 respond_printf(f
, "%s<%s>\r\n", ok_prefix
, addr2
->address
);
2246 /* Successful routing other than EXPN. */
2250 /* Handle successful routing when short info wanted. Otherwise continue for
2251 other (generated) addresses. Short info is the operational case. Full info
2252 can be requested only when debug_selector != 0 and a file is supplied.
2254 There is a conflict between the use of aliasing as an alternate email
2255 address, and as a sort of mailing list. If an alias turns the incoming
2256 address into just one address (e.g. J.Caesar->jc44) you may well want to
2257 carry on verifying the generated address to ensure it is valid when
2258 checking incoming mail. If aliasing generates multiple addresses, you
2259 probably don't want to do this. Exim therefore treats the generation of
2260 just a single new address as a special case, and continues on to verify the
2261 generated address. */
2263 if ( !full_info
/* Stop if short info wanted AND */
2264 && ( ( !addr_new
/* No new address OR */
2265 || addr_new
->next
/* More than one new address OR */
2266 || testflag(addr_new
, af_pfr
) /* New address is pfr */
2269 ( addr_new
/* At least one new address AND */
2270 && success_on_redirect
/* success_on_redirect is set */
2274 if (f
) fprintf(f
, "%s %s\n",
2275 address
, address_test_mode
? "is deliverable" : "verified");
2277 /* If we have carried on to verify a child address, we want the value
2278 of $address_data to be that of the child */
2280 vaddr
->prop
.address_data
= addr
->prop
.address_data
;
2282 /* If stopped because more than one new address, cannot cutthrough */
2284 if (addr_new
&& addr_new
->next
)
2285 cancel_cutthrough_connection("multiple addresses from routing");
2291 } /* Loop for generated addresses */
2293 /* Display the full results of the successful routing, including any generated
2294 addresses. Control gets here only when full_info is set, which requires f not
2295 to be NULL, and this occurs only when a top-level verify is called with the
2296 debugging switch on.
2298 If there are no local and no remote addresses, and there were no pipes, files,
2299 or autoreplies, and there were no errors or deferments, the message is to be
2300 discarded, usually because of the use of :blackhole: in an alias file. */
2302 if (allok
&& !addr_local
&& !addr_remote
)
2304 fprintf(f
, "mail to %s is discarded\n", address
);
2308 for (addr_list
= addr_local
, i
= 0; i
< 2; addr_list
= addr_remote
, i
++)
2311 address_item
*addr
= addr_list
;
2312 address_item
*p
= addr
->parent
;
2313 transport_instance
* tp
= addr
->transport
;
2315 addr_list
= addr
->next
;
2317 fprintf(f
, "%s", CS addr
->address
);
2318 #ifdef EXPERIMENTAL_SRS
2319 if(addr
->prop
.srs_sender
)
2320 fprintf(f
, " [srs = %s]", addr
->prop
.srs_sender
);
2323 /* If the address is a duplicate, show something about it. */
2325 if (!testflag(addr
, af_pfr
))
2328 if ((tnode
= tree_search(tree_duplicates
, addr
->unique
)))
2329 fprintf(f
, " [duplicate, would not be delivered]");
2330 else tree_add_duplicate(addr
->unique
, addr
);
2333 /* Now show its parents */
2335 for (p
= addr
->parent
; p
; p
= p
->parent
)
2336 fprintf(f
, "\n <-- %s", p
->address
);
2339 /* Show router, and transport */
2341 fprintf(f
, "router = %s, transport = %s\n",
2342 addr
->router
->name
, tp
? tp
->name
: US
"unset");
2344 /* Show any hosts that are set up by a router unless the transport
2345 is going to override them; fiddle a bit to get a nice format. */
2347 if (addr
->host_list
&& tp
&& !tp
->overrides_hosts
)
2352 for (h
= addr
->host_list
; h
; h
= h
->next
)
2353 { /* get max lengths of host names, addrs */
2354 int len
= Ustrlen(h
->name
);
2355 if (len
> maxlen
) maxlen
= len
;
2356 len
= h
->address
? Ustrlen(h
->address
) : 7;
2357 if (len
> maxaddlen
) maxaddlen
= len
;
2359 for (h
= addr
->host_list
; h
; h
= h
->next
)
2361 fprintf(f
, " host %-*s ", maxlen
, h
->name
);
2364 fprintf(f
, "[%s%-*c", h
->address
, maxaddlen
+1 - Ustrlen(h
->address
), ']');
2365 else if (tp
->info
->local
)
2366 fprintf(f
, " %-*s ", maxaddlen
, ""); /* Omit [unknown] for local */
2368 fprintf(f
, "[%s%-*c", "unknown", maxaddlen
+1 - 7, ']');
2370 if (h
->mx
>= 0) fprintf(f
, " MX=%d", h
->mx
);
2371 if (h
->port
!= PORT_NONE
) fprintf(f
, " port=%d", h
->port
);
2372 if (running_in_test_harness
&& h
->dnssec
== DS_YES
) fputs(" AD", f
);
2373 if (h
->status
== hstatus_unusable
) fputs(" ** unusable **", f
);
2379 /* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
2380 the -bv or -bt case). */
2384 tls_modify_variables(&tls_in
);
2392 /*************************************************
2393 * Check headers for syntax errors *
2394 *************************************************/
2396 /* This function checks those header lines that contain addresses, and verifies
2397 that all the addresses therein are syntactially correct.
2400 msgptr where to put an error message
2407 verify_check_headers(uschar
**msgptr
)
2413 for (h
= header_list
; h
!= NULL
&& yield
== OK
; h
= h
->next
)
2415 if (h
->type
!= htype_from
&&
2416 h
->type
!= htype_reply_to
&&
2417 h
->type
!= htype_sender
&&
2418 h
->type
!= htype_to
&&
2419 h
->type
!= htype_cc
&&
2420 h
->type
!= htype_bcc
)
2423 colon
= Ustrchr(h
->text
, ':');
2425 while (isspace(*s
)) s
++;
2427 /* Loop for multiple addresses in the header, enabling group syntax. Note
2428 that we have to reset this after the header has been scanned. */
2430 parse_allow_group
= TRUE
;
2434 uschar
*ss
= parse_find_address_end(s
, FALSE
);
2435 uschar
*recipient
, *errmess
;
2436 int terminator
= *ss
;
2437 int start
, end
, domain
;
2439 /* Temporarily terminate the string at this point, and extract the
2440 operative address within, allowing group syntax. */
2443 recipient
= parse_extract_address(s
,&errmess
,&start
,&end
,&domain
,FALSE
);
2446 /* Permit an unqualified address only if the message is local, or if the
2447 sending host is configured to be permitted to send them. */
2449 if (recipient
!= NULL
&& domain
== 0)
2451 if (h
->type
== htype_from
|| h
->type
== htype_sender
)
2453 if (!allow_unqualified_sender
) recipient
= NULL
;
2457 if (!allow_unqualified_recipient
) recipient
= NULL
;
2459 if (recipient
== NULL
) errmess
= US
"unqualified address not permitted";
2462 /* It's an error if no address could be extracted, except for the special
2463 case of an empty address. */
2465 if (recipient
== NULL
&& Ustrcmp(errmess
, "empty address") != 0)
2467 uschar
*verb
= US
"is";
2472 /* Arrange not to include any white space at the end in the
2473 error message or the header name. */
2475 while (t
> s
&& isspace(t
[-1])) t
--;
2476 while (tt
> h
->text
&& isspace(tt
[-1])) tt
--;
2478 /* Add the address that failed to the error message, since in a
2479 header with very many addresses it is sometimes hard to spot
2480 which one is at fault. However, limit the amount of address to
2481 quote - cases have been seen where, for example, a missing double
2482 quote in a humungous To: header creates an "address" that is longer
2483 than string_sprintf can handle. */
2492 /* deconst cast ok as we're passing a non-const to string_printing() */
2493 *msgptr
= US
string_printing(
2494 string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s",
2495 errmess
, tt
- h
->text
, h
->text
, verb
, len
, s
));
2498 break; /* Out of address loop */
2501 /* Advance to the next address */
2503 s
= ss
+ (terminator
? 1:0);
2504 while (isspace(*s
)) s
++;
2505 } /* Next address */
2507 parse_allow_group
= FALSE
;
2508 parse_found_group
= FALSE
;
2509 } /* Next header unless yield has been set FALSE */
2515 /*************************************************
2516 * Check header names for 8-bit characters *
2517 *************************************************/
2519 /* This function checks for invalid charcters in header names. See
2520 RFC 5322, 2.2. and RFC 6532, 3.
2523 msgptr where to put an error message
2530 verify_check_header_names_ascii(uschar
**msgptr
)
2535 for (h
= header_list
; h
!= NULL
; h
= h
->next
)
2537 colon
= Ustrchr(h
->text
, ':');
2538 for(s
= h
->text
; s
< colon
; s
++)
2540 if ((*s
< 33) || (*s
> 126))
2542 *msgptr
= string_sprintf("Invalid character in header \"%.*s\" found",
2543 colon
- h
->text
, h
->text
);
2551 /*************************************************
2552 * Check for blind recipients *
2553 *************************************************/
2555 /* This function checks that every (envelope) recipient is mentioned in either
2556 the To: or Cc: header lines, thus detecting blind carbon copies.
2558 There are two ways of scanning that could be used: either scan the header lines
2559 and tick off the recipients, or scan the recipients and check the header lines.
2560 The original proposed patch did the former, but I have chosen to do the latter,
2561 because (a) it requires no memory and (b) will use fewer resources when there
2562 are many addresses in To: and/or Cc: and only one or two envelope recipients.
2565 Returns: OK if there are no blind recipients
2566 FAIL if there is at least one blind recipient
2570 verify_check_notblind(void)
2573 for (i
= 0; i
< recipients_count
; i
++)
2577 uschar
*address
= recipients_list
[i
].address
;
2579 for (h
= header_list
; !found
&& h
!= NULL
; h
= h
->next
)
2583 if (h
->type
!= htype_to
&& h
->type
!= htype_cc
) continue;
2585 colon
= Ustrchr(h
->text
, ':');
2587 while (isspace(*s
)) s
++;
2589 /* Loop for multiple addresses in the header, enabling group syntax. Note
2590 that we have to reset this after the header has been scanned. */
2592 parse_allow_group
= TRUE
;
2596 uschar
*ss
= parse_find_address_end(s
, FALSE
);
2597 uschar
*recipient
,*errmess
;
2598 int terminator
= *ss
;
2599 int start
, end
, domain
;
2601 /* Temporarily terminate the string at this point, and extract the
2602 operative address within, allowing group syntax. */
2605 recipient
= parse_extract_address(s
,&errmess
,&start
,&end
,&domain
,FALSE
);
2608 /* If we found a valid recipient that has a domain, compare it with the
2609 envelope recipient. Local parts are compared case-sensitively, domains
2610 case-insensitively. By comparing from the start with length "domain", we
2611 include the "@" at the end, which ensures that we are comparing the whole
2612 local part of each address. */
2614 if (recipient
!= NULL
&& domain
!= 0)
2616 found
= Ustrncmp(recipient
, address
, domain
) == 0 &&
2617 strcmpic(recipient
+ domain
, address
+ domain
) == 0;
2621 /* Advance to the next address */
2623 s
= ss
+ (terminator
? 1:0);
2624 while (isspace(*s
)) s
++;
2625 } /* Next address */
2627 parse_allow_group
= FALSE
;
2628 parse_found_group
= FALSE
;
2629 } /* Next header (if found is false) */
2631 if (!found
) return FAIL
;
2632 } /* Next recipient */
2639 /*************************************************
2640 * Find if verified sender *
2641 *************************************************/
2643 /* Usually, just a single address is verified as the sender of the message.
2644 However, Exim can be made to verify other addresses as well (often related in
2645 some way), and this is useful in some environments. There may therefore be a
2646 chain of such addresses that have previously been tested. This function finds
2647 whether a given address is on the chain.
2649 Arguments: the address to be verified
2650 Returns: pointer to an address item, or NULL
2654 verify_checked_sender(uschar
*sender
)
2657 for (addr
= sender_verified_list
; addr
!= NULL
; addr
= addr
->next
)
2658 if (Ustrcmp(sender
, addr
->address
) == 0) break;
2666 /*************************************************
2667 * Get valid header address *
2668 *************************************************/
2670 /* Scan the originator headers of the message, looking for an address that
2671 verifies successfully. RFC 822 says:
2673 o The "Sender" field mailbox should be sent notices of
2674 any problems in transport or delivery of the original
2675 messages. If there is no "Sender" field, then the
2676 "From" field mailbox should be used.
2678 o If the "Reply-To" field exists, then the reply should
2679 go to the addresses indicated in that field and not to
2680 the address(es) indicated in the "From" field.
2682 So we check a Sender field if there is one, else a Reply_to field, else a From
2683 field. As some strange messages may have more than one of these fields,
2684 especially if they are resent- fields, check all of them if there is more than
2688 user_msgptr points to where to put a user error message
2689 log_msgptr points to where to put a log error message
2690 callout timeout for callout check (passed to verify_address())
2691 callout_overall overall callout timeout (ditto)
2692 callout_connect connect callout timeout (ditto)
2693 se_mailfrom mailfrom for verify; NULL => ""
2694 pm_mailfrom sender for pm callout check (passed to verify_address())
2695 options callout options (passed to verify_address())
2696 verrno where to put the address basic_errno
2698 If log_msgptr is set to something without setting user_msgptr, the caller
2699 normally uses log_msgptr for both things.
2701 Returns: result of the verification attempt: OK, FAIL, or DEFER;
2702 FAIL is given if no appropriate headers are found
2706 verify_check_header_address(uschar
**user_msgptr
, uschar
**log_msgptr
,
2707 int callout
, int callout_overall
, int callout_connect
, uschar
*se_mailfrom
,
2708 uschar
*pm_mailfrom
, int options
, int *verrno
)
2710 static int header_types
[] = { htype_sender
, htype_reply_to
, htype_from
};
2715 for (i
= 0; i
< 3 && !done
; i
++)
2718 for (h
= header_list
; h
!= NULL
&& !done
; h
= h
->next
)
2720 int terminator
, new_ok
;
2721 uschar
*s
, *ss
, *endname
;
2723 if (h
->type
!= header_types
[i
]) continue;
2724 s
= endname
= Ustrchr(h
->text
, ':') + 1;
2726 /* Scan the addresses in the header, enabling group syntax. Note that we
2727 have to reset this after the header has been scanned. */
2729 parse_allow_group
= TRUE
;
2733 address_item
*vaddr
;
2735 while (isspace(*s
) || *s
== ',') s
++;
2736 if (*s
== 0) break; /* End of header */
2738 ss
= parse_find_address_end(s
, FALSE
);
2740 /* The terminator is a comma or end of header, but there may be white
2741 space preceding it (including newline for the last address). Move back
2742 past any white space so we can check against any cached envelope sender
2743 address verifications. */
2745 while (isspace(ss
[-1])) ss
--;
2749 HDEBUG(D_verify
) debug_printf("verifying %.*s header address %s\n",
2750 (int)(endname
- h
->text
), h
->text
, s
);
2752 /* See if we have already verified this address as an envelope sender,
2753 and if so, use the previous answer. */
2755 vaddr
= verify_checked_sender(s
);
2757 if (vaddr
!= NULL
&& /* Previously checked */
2758 (callout
<= 0 || /* No callout needed; OR */
2759 vaddr
->special_action
> 256)) /* Callout was done */
2761 new_ok
= vaddr
->special_action
& 255;
2762 HDEBUG(D_verify
) debug_printf("previously checked as envelope sender\n");
2763 *ss
= terminator
; /* Restore shortened string */
2766 /* Otherwise we run the verification now. We must restore the shortened
2767 string before running the verification, so the headers are correct, in
2768 case there is any rewriting. */
2772 int start
, end
, domain
;
2773 uschar
*address
= parse_extract_address(s
, log_msgptr
, &start
, &end
,
2778 /* If we found an empty address, just carry on with the next one, but
2779 kill the message. */
2781 if (address
== NULL
&& Ustrcmp(*log_msgptr
, "empty address") == 0)
2788 /* If verification failed because of a syntax error, fail this
2789 function, and ensure that the failing address gets added to the error
2792 if (address
== NULL
)
2795 while (ss
> s
&& isspace(ss
[-1])) ss
--;
2796 *log_msgptr
= string_sprintf("syntax error in '%.*s' header when "
2797 "scanning for sender: %s in \"%.*s\"",
2798 endname
- h
->text
, h
->text
, *log_msgptr
, ss
- s
, s
);
2804 /* Else go ahead with the sender verification. But it isn't *the*
2805 sender of the message, so set vopt_fake_sender to stop sender_address
2806 being replaced after rewriting or qualification. */
2810 vaddr
= deliver_make_addr(address
, FALSE
);
2811 new_ok
= verify_address(vaddr
, NULL
, options
| vopt_fake_sender
,
2812 callout
, callout_overall
, callout_connect
, se_mailfrom
,
2817 /* We now have the result, either newly found, or cached. If we are
2818 giving out error details, set a specific user error. This means that the
2819 last of these will be returned to the user if all three fail. We do not
2820 set a log message - the generic one below will be used. */
2824 *verrno
= vaddr
->basic_errno
;
2825 if (smtp_return_error_details
)
2827 *user_msgptr
= string_sprintf("Rejected after DATA: "
2828 "could not verify \"%.*s\" header address\n%s: %s",
2829 endname
- h
->text
, h
->text
, vaddr
->address
, vaddr
->message
);
2833 /* Success or defer */
2842 if (new_ok
== DEFER
) yield
= DEFER
;
2844 /* Move on to any more addresses in the header */
2847 } /* Next address */
2849 parse_allow_group
= FALSE
;
2850 parse_found_group
= FALSE
;
2851 } /* Next header, unless done */
2852 } /* Next header type unless done */
2854 if (yield
== FAIL
&& *log_msgptr
== NULL
)
2855 *log_msgptr
= US
"there is no valid sender in any header line";
2857 if (yield
== DEFER
&& *log_msgptr
== NULL
)
2858 *log_msgptr
= US
"all attempts to verify a sender in a header line deferred";
2866 /*************************************************
2867 * Get RFC 1413 identification *
2868 *************************************************/
2870 /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If
2871 the timeout is set to zero, then the query is not done. There may also be lists
2872 of hosts and nets which are exempt. To guard against malefactors sending
2873 non-printing characters which could, for example, disrupt a message's headers,
2874 make sure the string consists of printing characters only.
2877 port the port to connect to; usually this is IDENT_PORT (113), but when
2878 running in the test harness with -bh a different value is used.
2882 Side effect: any received ident value is put in sender_ident (NULL otherwise)
2886 verify_get_ident(int port
)
2888 int sock
, host_af
, qlen
;
2889 int received_sender_port
, received_interface_port
, n
;
2891 uschar buffer
[2048];
2893 /* Default is no ident. Check whether we want to do an ident check for this
2896 sender_ident
= NULL
;
2897 if (rfc1413_query_timeout
<= 0 || verify_check_host(&rfc1413_hosts
) != OK
)
2900 DEBUG(D_ident
) debug_printf("doing ident callback\n");
2902 /* Set up a connection to the ident port of the remote host. Bind the local end
2903 to the incoming interface address. If the sender host address is an IPv6
2904 address, the incoming interface address will also be IPv6. */
2906 host_af
= (Ustrchr(sender_host_address
, ':') == NULL
)? AF_INET
: AF_INET6
;
2907 sock
= ip_socket(SOCK_STREAM
, host_af
);
2908 if (sock
< 0) return;
2910 if (ip_bind(sock
, host_af
, interface_address
, 0) < 0)
2912 DEBUG(D_ident
) debug_printf("bind socket for ident failed: %s\n",
2917 if (ip_connect(sock
, host_af
, sender_host_address
, port
, rfc1413_query_timeout
)
2920 if (errno
== ETIMEDOUT
&& LOGGING(ident_timeout
))
2922 log_write(0, LOG_MAIN
, "ident connection to %s timed out",
2923 sender_host_address
);
2927 DEBUG(D_ident
) debug_printf("ident connection to %s failed: %s\n",
2928 sender_host_address
, strerror(errno
));
2933 /* Construct and send the query. */
2935 sprintf(CS buffer
, "%d , %d\r\n", sender_host_port
, interface_port
);
2936 qlen
= Ustrlen(buffer
);
2937 if (send(sock
, buffer
, qlen
, 0) < 0)
2939 DEBUG(D_ident
) debug_printf("ident send failed: %s\n", strerror(errno
));
2943 /* Read a response line. We put it into the rest of the buffer, using several
2944 recv() calls if necessary. */
2952 int size
= sizeof(buffer
) - (p
- buffer
);
2954 if (size
<= 0) goto END_OFF
; /* Buffer filled without seeing \n. */
2955 count
= ip_recv(sock
, p
, size
, rfc1413_query_timeout
);
2956 if (count
<= 0) goto END_OFF
; /* Read error or EOF */
2958 /* Scan what we just read, to see if we have reached the terminating \r\n. Be
2959 generous, and accept a plain \n terminator as well. The only illegal
2962 for (pp
= p
; pp
< p
+ count
; pp
++)
2964 if (*pp
== 0) goto END_OFF
; /* Zero octet not allowed */
2967 if (pp
[-1] == '\r') pp
--;
2969 goto GOT_DATA
; /* Break out of both loops */
2973 /* Reached the end of the data without finding \n. Let the loop continue to
2974 read some more, if there is room. */
2981 /* We have received a line of data. Check it carefully. It must start with the
2982 same two port numbers that we sent, followed by data as defined by the RFC. For
2985 12345 , 25 : USERID : UNIX :root
2987 However, the amount of white space may be different to what we sent. In the
2988 "osname" field there may be several sub-fields, comma separated. The data we
2989 actually want to save follows the third colon. Some systems put leading spaces
2990 in it - we discard those. */
2992 if (sscanf(CS buffer
+ qlen
, "%d , %d%n", &received_sender_port
,
2993 &received_interface_port
, &n
) != 2 ||
2994 received_sender_port
!= sender_host_port
||
2995 received_interface_port
!= interface_port
)
2998 p
= buffer
+ qlen
+ n
;
2999 while(isspace(*p
)) p
++;
3000 if (*p
++ != ':') goto END_OFF
;
3001 while(isspace(*p
)) p
++;
3002 if (Ustrncmp(p
, "USERID", 6) != 0) goto END_OFF
;
3004 while(isspace(*p
)) p
++;
3005 if (*p
++ != ':') goto END_OFF
;
3006 while (*p
!= 0 && *p
!= ':') p
++;
3007 if (*p
++ == 0) goto END_OFF
;
3008 while(isspace(*p
)) p
++;
3009 if (*p
== 0) goto END_OFF
;
3011 /* The rest of the line is the data we want. We turn it into printing
3012 characters when we save it, so that it cannot mess up the format of any logging
3013 or Received: lines into which it gets inserted. We keep a maximum of 127
3014 characters. The deconst cast is ok as we fed a nonconst to string_printing() */
3016 sender_ident
= US
string_printing(string_copyn(p
, 127));
3017 DEBUG(D_ident
) debug_printf("sender_ident = %s\n", sender_ident
);
3027 /*************************************************
3028 * Match host to a single host-list item *
3029 *************************************************/
3031 /* This function compares a host (name or address) against a single item
3032 from a host list. The host name gets looked up if it is needed and is not
3033 already known. The function is called from verify_check_this_host() via
3034 match_check_list(), which is why most of its arguments are in a single block.
3037 arg the argument block (see below)
3038 ss the host-list item
3039 valueptr where to pass back looked up data, or NULL
3040 error for error message when returning ERROR
3043 host_name (a) the host name, or
3044 (b) NULL, implying use sender_host_name and
3045 sender_host_aliases, looking them up if required, or
3046 (c) the empty string, meaning that only IP address matches
3048 host_address the host address
3049 host_ipv4 the IPv4 address taken from an IPv6 one
3053 DEFER lookup deferred
3054 ERROR (a) failed to find the host name or IP address, or
3055 (b) unknown lookup type specified, or
3056 (c) host name encountered when only IP addresses are
3061 check_host(void *arg
, const uschar
*ss
, const uschar
**valueptr
, uschar
**error
)
3063 check_host_block
*cb
= (check_host_block
*)arg
;
3066 BOOL iplookup
= FALSE
;
3067 BOOL isquery
= FALSE
;
3068 BOOL isiponly
= cb
->host_name
!= NULL
&& cb
->host_name
[0] == 0;
3073 /* Optimize for the special case when the pattern is "*". */
3075 if (*ss
== '*' && ss
[1] == 0) return OK
;
3077 /* If the pattern is empty, it matches only in the case when there is no host -
3078 this can occur in ACL checking for SMTP input using the -bs option. In this
3079 situation, the host address is the empty string. */
3081 if (cb
->host_address
[0] == 0) return (*ss
== 0)? OK
: FAIL
;
3082 if (*ss
== 0) return FAIL
;
3084 /* If the pattern is precisely "@" then match against the primary host name,
3085 provided that host name matching is permitted; if it's "@[]" match against the
3086 local host's IP addresses. */
3092 if (isiponly
) return ERROR
;
3093 ss
= primary_hostname
;
3095 else if (Ustrcmp(ss
, "@[]") == 0)
3097 ip_address_item
*ip
;
3098 for (ip
= host_find_interfaces(); ip
!= NULL
; ip
= ip
->next
)
3099 if (Ustrcmp(ip
->address
, cb
->host_address
) == 0) return OK
;
3104 /* If the pattern is an IP address, optionally followed by a bitmask count, do
3105 a (possibly masked) comparision with the current IP address. */
3107 if (string_is_ip_address(ss
, &maskoffset
) != 0)
3108 return (host_is_in_net(cb
->host_address
, ss
, maskoffset
)? OK
: FAIL
);
3110 /* The pattern is not an IP address. A common error that people make is to omit
3111 one component of an IPv4 address, either by accident, or believing that, for
3112 example, 1.2.3/24 is the same as 1.2.3.0/24, or 1.2.3 is the same as 1.2.3.0,
3113 which it isn't. (Those applications that do accept 1.2.3 as an IP address
3114 interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an
3115 ancient specification.) To aid in debugging these cases, we give a specific
3116 error if the pattern contains only digits and dots or contains a slash preceded
3117 only by digits and dots (a slash at the start indicates a file name and of
3118 course slashes may be present in lookups, but not preceded only by digits and
3121 for (t
= ss
; isdigit(*t
) || *t
== '.'; t
++);
3122 if (*t
== 0 || (*t
== '/' && t
!= ss
))
3124 *error
= US
"malformed IPv4 address or address mask";
3128 /* See if there is a semicolon in the pattern */
3130 semicolon
= Ustrchr(ss
, ';');
3132 /* If we are doing an IP address only match, then all lookups must be IP
3133 address lookups, even if there is no "net-". */
3137 iplookup
= semicolon
!= NULL
;
3140 /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
3141 a lookup on a masked IP network, in textual form. We obey this code even if we
3142 have already set iplookup, so as to skip over the "net-" prefix and to set the
3143 mask length. The net- stuff really only applies to single-key lookups where the
3144 key is implicit. For query-style lookups the key is specified in the query.
3145 From release 4.30, the use of net- for query style is no longer needed, but we
3146 retain it for backward compatibility. */
3148 if (Ustrncmp(ss
, "net", 3) == 0 && semicolon
!= NULL
)
3151 for (t
= ss
+ 3; isdigit(*t
); t
++) mlen
= mlen
* 10 + *t
- '0';
3152 if (mlen
== 0 && t
== ss
+3) mlen
= -1; /* No mask supplied */
3153 iplookup
= (*t
++ == '-');
3157 /* Do the IP address lookup if that is indeed what we have */
3165 uschar
*filename
, *key
, *result
;
3168 /* Find the search type */
3170 search_type
= search_findtype(t
, semicolon
- t
);
3172 if (search_type
< 0) log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "%s",
3173 search_error_message
);
3175 /* Adjust parameters for the type of lookup. For a query-style lookup, there
3176 is no file name, and the "key" is just the query. For query-style with a file
3177 name, we have to fish the file off the start of the query. For a single-key
3178 lookup, the key is the current IP address, masked appropriately, and
3179 reconverted to text form, with the mask appended. For IPv6 addresses, specify
3180 dot separators instead of colons, except when the lookup type is "iplsearch".
3183 if (mac_islookup(search_type
, lookup_absfilequery
))
3185 filename
= semicolon
+ 1;
3187 while (*key
!= 0 && !isspace(*key
)) key
++;
3188 filename
= string_copyn(filename
, key
- filename
);
3189 while (isspace(*key
)) key
++;
3191 else if (mac_islookup(search_type
, lookup_querystyle
))
3194 key
= semicolon
+ 1;
3196 else /* Single-key style */
3198 int sep
= (Ustrcmp(lookup_list
[search_type
]->name
, "iplsearch") == 0)?
3200 insize
= host_aton(cb
->host_address
, incoming
);
3201 host_mask(insize
, incoming
, mlen
);
3202 (void)host_nmtoa(insize
, incoming
, mlen
, buffer
, sep
);
3204 filename
= semicolon
+ 1;
3207 /* Now do the actual lookup; note that there is no search_close() because
3208 of the caching arrangements. */
3210 if (!(handle
= search_open(filename
, search_type
, 0, NULL
, NULL
)))
3211 log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "%s", search_error_message
);
3213 result
= search_find(handle
, filename
, key
, -1, NULL
, 0, 0, NULL
);
3214 if (valueptr
!= NULL
) *valueptr
= result
;
3215 return (result
!= NULL
)? OK
: search_find_defer
? DEFER
: FAIL
;
3218 /* The pattern is not an IP address or network reference of any kind. That is,
3219 it is a host name pattern. If this is an IP only match, there's an error in the
3224 *error
= US
"cannot match host name in match_ip list";
3228 /* Check the characters of the pattern to see if they comprise only letters,
3229 digits, full stops, and hyphens (the constituents of domain names). Allow
3230 underscores, as they are all too commonly found. Sigh. Also, if
3231 allow_utf8_domains is set, allow top-bit characters. */
3233 for (t
= ss
; *t
!= 0; t
++)
3234 if (!isalnum(*t
) && *t
!= '.' && *t
!= '-' && *t
!= '_' &&
3235 (!allow_utf8_domains
|| *t
< 128)) break;
3237 /* If the pattern is a complete domain name, with no fancy characters, look up
3238 its IP address and match against that. Note that a multi-homed host will add
3239 items to the chain. */
3250 /* Using byname rather than bydns here means we cannot determine dnssec
3251 status. On the other hand it is unclear how that could be either
3252 propagated up or enforced. */
3254 rc
= host_find_byname(&h
, NULL
, HOST_FIND_QUALIFY_SINGLE
, NULL
, FALSE
);
3255 if (rc
== HOST_FOUND
|| rc
== HOST_FOUND_LOCAL
)
3258 for (hh
= &h
; hh
!= NULL
; hh
= hh
->next
)
3260 if (host_is_in_net(hh
->address
, cb
->host_address
, 0)) return OK
;
3264 if (rc
== HOST_FIND_AGAIN
) return DEFER
;
3265 *error
= string_sprintf("failed to find IP address for %s", ss
);
3269 /* Almost all subsequent comparisons require the host name, and can be done
3270 using the general string matching function. When this function is called for
3271 outgoing hosts, the name is always given explicitly. If it is NULL, it means we
3272 must use sender_host_name and its aliases, looking them up if necessary. */
3274 if (cb
->host_name
!= NULL
) /* Explicit host name given */
3275 return match_check_string(cb
->host_name
, ss
, -1, TRUE
, TRUE
, TRUE
,
3278 /* Host name not given; in principle we need the sender host name and its
3279 aliases. However, for query-style lookups, we do not need the name if the
3280 query does not contain $sender_host_name. From release 4.23, a reference to
3281 $sender_host_name causes it to be looked up, so we don't need to do the lookup
3284 if ((semicolon
= Ustrchr(ss
, ';')) != NULL
)
3286 const uschar
*affix
;
3287 int partial
, affixlen
, starflags
, id
;
3290 id
= search_findtype_partial(ss
, &partial
, &affix
, &affixlen
, &starflags
);
3293 if (id
< 0) /* Unknown lookup type */
3295 log_write(0, LOG_MAIN
|LOG_PANIC
, "%s in host list item \"%s\"",
3296 search_error_message
, ss
);
3299 isquery
= mac_islookup(id
, lookup_querystyle
|lookup_absfilequery
);
3304 switch(match_check_string(US
"", ss
, -1, TRUE
, TRUE
, TRUE
, valueptr
))
3307 case DEFER
: return DEFER
;
3308 default: return FAIL
;
3312 /* Not a query-style lookup; must ensure the host name is present, and then we
3313 do a check on the name and all its aliases. */
3315 if (sender_host_name
== NULL
)
3317 HDEBUG(D_host_lookup
)
3318 debug_printf("sender host name required, to match against %s\n", ss
);
3319 if (host_lookup_failed
|| host_name_lookup() != OK
)
3321 *error
= string_sprintf("failed to find host name for %s",
3322 sender_host_address
);;
3325 host_build_sender_fullhost();
3328 /* Match on the sender host name, using the general matching function */
3330 switch(match_check_string(sender_host_name
, ss
, -1, TRUE
, TRUE
, TRUE
,
3334 case DEFER
: return DEFER
;
3337 /* If there are aliases, try matching on them. */
3339 aliases
= sender_host_aliases
;
3340 while (*aliases
!= NULL
)
3342 switch(match_check_string(*aliases
++, ss
, -1, TRUE
, TRUE
, TRUE
, valueptr
))
3345 case DEFER
: return DEFER
;
3354 /*************************************************
3355 * Check a specific host matches a host list *
3356 *************************************************/
3358 /* This function is passed a host list containing items in a number of
3359 different formats and the identity of a host. Its job is to determine whether
3360 the given host is in the set of hosts defined by the list. The host name is
3361 passed as a pointer so that it can be looked up if needed and not already
3362 known. This is commonly the case when called from verify_check_host() to check
3363 an incoming connection. When called from elsewhere the host name should usually
3366 This function is now just a front end to match_check_list(), which runs common
3367 code for scanning a list. We pass it the check_host() function to perform a
3371 listptr pointer to the host list
3372 cache_bits pointer to cache for named lists, or NULL
3373 host_name the host name or NULL, implying use sender_host_name and
3374 sender_host_aliases, looking them up if required
3375 host_address the IP address
3376 valueptr if not NULL, data from a lookup is passed back here
3378 Returns: OK if the host is in the defined set
3379 FAIL if the host is not in the defined set,
3380 DEFER if a data lookup deferred (not a host lookup)
3382 If the host name was needed in order to make a comparison, and could not be
3383 determined from the IP address, the result is FAIL unless the item
3384 "+allow_unknown" was met earlier in the list, in which case OK is returned. */
3387 verify_check_this_host(const uschar
**listptr
, unsigned int *cache_bits
,
3388 const uschar
*host_name
, const uschar
*host_address
, const uschar
**valueptr
)
3391 unsigned int *local_cache_bits
= cache_bits
;
3392 const uschar
*save_host_address
= deliver_host_address
;
3393 check_host_block cb
;
3394 cb
.host_name
= host_name
;
3395 cb
.host_address
= host_address
;
3397 if (valueptr
!= NULL
) *valueptr
= NULL
;
3399 /* If the host address starts off ::ffff: it is an IPv6 address in
3400 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3403 cb
.host_ipv4
= (Ustrncmp(host_address
, "::ffff:", 7) == 0)?
3404 host_address
+ 7 : host_address
;
3406 /* During the running of the check, put the IP address into $host_address. In
3407 the case of calls from the smtp transport, it will already be there. However,
3408 in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
3409 the safe side, any existing setting is preserved, though as I write this
3410 (November 2004) I can't see any cases where it is actually needed. */
3412 deliver_host_address
= host_address
;
3413 rc
= match_check_list(
3414 listptr
, /* the list */
3415 0, /* separator character */
3416 &hostlist_anchor
, /* anchor pointer */
3417 &local_cache_bits
, /* cache pointer */
3418 check_host
, /* function for testing */
3419 &cb
, /* argument for function */
3420 MCL_HOST
, /* type of check */
3421 (host_address
== sender_host_address
)?
3422 US
"host" : host_address
, /* text for debugging */
3423 valueptr
); /* where to pass back data */
3424 deliver_host_address
= save_host_address
;
3431 /*************************************************
3432 * Check the given host item matches a list *
3433 *************************************************/
3435 verify_check_given_host(uschar
**listptr
, host_item
*host
)
3437 return verify_check_this_host(CUSS listptr
, NULL
, host
->name
, host
->address
, NULL
);
3440 /*************************************************
3441 * Check the remote host matches a list *
3442 *************************************************/
3444 /* This is a front end to verify_check_this_host(), created because checking
3445 the remote host is a common occurrence. With luck, a good compiler will spot
3446 the tail recursion and optimize it. If there's no host address, this is
3447 command-line SMTP input - check against an empty string for the address.
3450 listptr pointer to the host list
3452 Returns: the yield of verify_check_this_host(),
3453 i.e. OK, FAIL, or DEFER
3457 verify_check_host(uschar
**listptr
)
3459 return verify_check_this_host(CUSS listptr
, sender_host_cache
, NULL
,
3460 (sender_host_address
== NULL
)? US
"" : sender_host_address
, NULL
);
3467 /*************************************************
3468 * Invert an IP address *
3469 *************************************************/
3471 /* Originally just used for DNS xBL lists, now also used for the
3472 reverse_ip expansion operator.
3475 buffer where to put the answer
3476 address the address to invert
3480 invert_address(uschar
*buffer
, uschar
*address
)
3483 uschar
*bptr
= buffer
;
3485 /* If this is an IPv4 address mapped into IPv6 format, adjust the pointer
3486 to the IPv4 part only. */
3488 if (Ustrncmp(address
, "::ffff:", 7) == 0) address
+= 7;
3490 /* Handle IPv4 address: when HAVE_IPV6 is false, the result of host_aton() is
3493 if (host_aton(address
, bin
) == 1)
3497 for (i
= 0; i
< 4; i
++)
3499 sprintf(CS bptr
, "%d.", x
& 255);
3500 while (*bptr
) bptr
++;
3505 /* Handle IPv6 address. Actually, as far as I know, there are no IPv6 addresses
3506 in any DNS black lists, and the format in which they will be looked up is
3507 unknown. This is just a guess. */
3513 for (j
= 3; j
>= 0; j
--)
3516 for (i
= 0; i
< 8; i
++)
3518 sprintf(CS bptr
, "%x.", x
& 15);
3519 while (*bptr
) bptr
++;
3526 /* Remove trailing period -- this is needed so that both arbitrary
3527 dnsbl keydomains and inverted addresses may be combined with the
3528 same format string, "%s.%s" */
3535 /*************************************************
3536 * Perform a single dnsbl lookup *
3537 *************************************************/
3539 /* This function is called from verify_check_dnsbl() below. It is also called
3540 recursively from within itself when domain and domain_txt are different
3541 pointers, in order to get the TXT record from the alternate domain.
3544 domain the outer dnsbl domain
3545 domain_txt alternate domain to lookup TXT record on success; when the
3546 same domain is to be used, domain_txt == domain (that is,
3547 the pointers must be identical, not just the text)
3548 keydomain the current keydomain (for debug message)
3549 prepend subdomain to lookup (like keydomain, but
3550 reversed if IP address)
3551 iplist the list of matching IP addresses, or NULL for "any"
3552 bitmask true if bitmask matching is wanted
3553 match_type condition for 'succeed' result
3554 0 => Any RR in iplist (=)
3555 1 => No RR in iplist (!=)
3556 2 => All RRs in iplist (==)
3557 3 => Some RRs not in iplist (!==)
3558 the two bits are defined as MT_NOT and MT_ALL
3559 defer_return what to return for a defer
3561 Returns: OK if lookup succeeded
3566 one_check_dnsbl(uschar
*domain
, uschar
*domain_txt
, uschar
*keydomain
,
3567 uschar
*prepend
, uschar
*iplist
, BOOL bitmask
, int match_type
,
3573 dnsbl_cache_block
*cb
;
3574 int old_pool
= store_pool
;
3575 uschar query
[256]; /* DNS domain max length */
3577 /* Construct the specific query domainname */
3579 if (!string_format(query
, sizeof(query
), "%s.%s", prepend
, domain
))
3581 log_write(0, LOG_MAIN
|LOG_PANIC
, "dnslist query is too long "
3582 "(ignored): %s...", query
);
3586 /* Look for this query in the cache. */
3588 if ( (t
= tree_search(dnsbl_cache
, query
))
3589 && (cb
= t
->data
.ptr
)->expiry
> time(NULL
)
3592 /* Previous lookup was cached */
3595 HDEBUG(D_dnsbl
) debug_printf("using result of previous DNS lookup\n");
3598 /* If not cached from a previous lookup, we must do a DNS lookup, and
3599 cache the result in permanent memory. */
3605 store_pool
= POOL_PERM
;
3609 HDEBUG(D_dnsbl
) debug_printf("cached data found but past valid time; ");
3613 { /* Set up a tree entry to cache the lookup */
3614 t
= store_get(sizeof(tree_node
) + Ustrlen(query
));
3615 Ustrcpy(t
->name
, query
);
3616 t
->data
.ptr
= cb
= store_get(sizeof(dnsbl_cache_block
));
3617 (void)tree_insertnode(&dnsbl_cache
, t
);
3620 /* Do the DNS loopup . */
3622 HDEBUG(D_dnsbl
) debug_printf("new DNS lookup for %s\n", query
);
3623 cb
->rc
= dns_basic_lookup(&dnsa
, query
, T_A
);
3624 cb
->text_set
= FALSE
;
3628 /* If the lookup succeeded, cache the RHS address. The code allows for
3629 more than one address - this was for complete generality and the possible
3630 use of A6 records. However, A6 records have been reduced to experimental
3631 status (August 2001) and may die out. So they may never get used at all,
3632 let alone in dnsbl records. However, leave the code here, just in case.
3634 Quite apart from one A6 RR generating multiple addresses, there are DNS
3635 lists that return more than one A record, so we must handle multiple
3636 addresses generated in that way as well.
3638 Mark the cache entry with the "now" plus the minimum of the address TTLs,
3639 or some suitably far-future time if none were found. */
3641 if (cb
->rc
== DNS_SUCCEED
)
3644 dns_address
**addrp
= &(cb
->rhs
);
3645 for (rr
= dns_next_rr(&dnsa
, &dnss
, RESET_ANSWERS
);
3647 rr
= dns_next_rr(&dnsa
, &dnss
, RESET_NEXT
))
3649 if (rr
->type
== T_A
)
3651 dns_address
*da
= dns_address_from_rr(&dnsa
, rr
);
3655 while (da
->next
!= NULL
) da
= da
->next
;
3656 addrp
= &(da
->next
);
3657 if (ttl
> rr
->ttl
) ttl
= rr
->ttl
;
3662 /* If we didn't find any A records, change the return code. This can
3663 happen when there is a CNAME record but there are no A records for what
3666 if (cb
->rhs
== NULL
) cb
->rc
= DNS_NODATA
;
3669 cb
->expiry
= time(NULL
)+ttl
;
3670 store_pool
= old_pool
;
3673 /* We now have the result of the DNS lookup, either newly done, or cached
3674 from a previous call. If the lookup succeeded, check against the address
3675 list if there is one. This may be a positive equality list (introduced by
3676 "="), a negative equality list (introduced by "!="), a positive bitmask
3677 list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/
3679 if (cb
->rc
== DNS_SUCCEED
)
3681 dns_address
*da
= NULL
;
3682 uschar
*addlist
= cb
->rhs
->address
;
3684 /* For A and AAAA records, there may be multiple addresses from multiple
3685 records. For A6 records (currently not expected to be used) there may be
3686 multiple addresses from a single record. */
3688 for (da
= cb
->rhs
->next
; da
!= NULL
; da
= da
->next
)
3689 addlist
= string_sprintf("%s, %s", addlist
, da
->address
);
3691 HDEBUG(D_dnsbl
) debug_printf("DNS lookup for %s succeeded (yielding %s)\n",
3694 /* Address list check; this can be either for equality, or via a bitmask.
3695 In the latter case, all the bits must match. */
3699 for (da
= cb
->rhs
; da
!= NULL
; da
= da
->next
)
3703 const uschar
*ptr
= iplist
;
3706 /* Handle exact matching */
3710 while ((res
= string_nextinlist(&ptr
, &ipsep
, ip
, sizeof(ip
))) != NULL
)
3712 if (Ustrcmp(CS da
->address
, ip
) == 0) break;
3716 /* Handle bitmask matching */
3723 /* At present, all known DNS blocking lists use A records, with
3724 IPv4 addresses on the RHS encoding the information they return. I
3725 wonder if this will linger on as the last vestige of IPv4 when IPv6
3726 is ubiquitous? Anyway, for now we use paranoia code to completely
3727 ignore IPv6 addresses. The default mask is 0, which always matches.
3728 We change this only for IPv4 addresses in the list. */
3730 if (host_aton(da
->address
, address
) == 1) mask
= address
[0];
3732 /* Scan the returned addresses, skipping any that are IPv6 */
3734 while ((res
= string_nextinlist(&ptr
, &ipsep
, ip
, sizeof(ip
))) != NULL
)
3736 if (host_aton(ip
, address
) != 1) continue;
3737 if ((address
[0] & mask
) == address
[0]) break;
3743 (a) An IP address in an any ('=') list matched, or
3744 (b) No IP address in an all ('==') list matched
3746 then we're done searching. */
3748 if (((match_type
& MT_ALL
) != 0) == (res
== NULL
)) break;
3751 /* If da == NULL, either
3753 (a) No IP address in an any ('=') list matched, or
3754 (b) An IP address in an all ('==') list didn't match
3756 so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on
3759 if ((match_type
== MT_NOT
|| match_type
== MT_ALL
) != (da
== NULL
))
3767 res
= US
"was no match";
3770 res
= US
"was an exclude match";
3773 res
= US
"was an IP address that did not match";
3776 res
= US
"were no IP addresses that did not match";
3779 debug_printf("=> but we are not accepting this block class because\n");
3780 debug_printf("=> there %s for %s%c%s\n",
3782 ((match_type
& MT_ALL
) == 0)? "" : "=",
3783 bitmask
? '&' : '=', iplist
);
3789 /* Either there was no IP list, or the record matched, implying that the
3790 domain is on the list. We now want to find a corresponding TXT record. If an
3791 alternate domain is specified for the TXT record, call this function
3792 recursively to look that up; this has the side effect of re-checking that
3793 there is indeed an A record at the alternate domain. */
3795 if (domain_txt
!= domain
)
3796 return one_check_dnsbl(domain_txt
, domain_txt
, keydomain
, prepend
, NULL
,
3797 FALSE
, match_type
, defer_return
);
3799 /* If there is no alternate domain, look up a TXT record in the main domain
3800 if it has not previously been cached. */
3804 cb
->text_set
= TRUE
;
3805 if (dns_basic_lookup(&dnsa
, query
, T_TXT
) == DNS_SUCCEED
)
3808 for (rr
= dns_next_rr(&dnsa
, &dnss
, RESET_ANSWERS
);
3810 rr
= dns_next_rr(&dnsa
, &dnss
, RESET_NEXT
))
3811 if (rr
->type
== T_TXT
) break;
3814 int len
= (rr
->data
)[0];
3815 if (len
> 511) len
= 127;
3816 store_pool
= POOL_PERM
;
3817 cb
->text
= string_sprintf("%.*s", len
, (const uschar
*)(rr
->data
+1));
3818 store_pool
= old_pool
;
3823 dnslist_value
= addlist
;
3824 dnslist_text
= cb
->text
;
3828 /* There was a problem with the DNS lookup */
3830 if (cb
->rc
!= DNS_NOMATCH
&& cb
->rc
!= DNS_NODATA
)
3832 log_write(L_dnslist_defer
, LOG_MAIN
,
3833 "DNS list lookup defer (probably timeout) for %s: %s", query
,
3834 (defer_return
== OK
)? US
"assumed in list" :
3835 (defer_return
== FAIL
)? US
"assumed not in list" :
3836 US
"returned DEFER");
3837 return defer_return
;
3840 /* No entry was found in the DNS; continue for next domain */
3844 debug_printf("DNS lookup for %s failed\n", query
);
3845 debug_printf("=> that means %s is not listed at %s\n",
3855 /*************************************************
3856 * Check host against DNS black lists *
3857 *************************************************/
3859 /* This function runs checks against a list of DNS black lists, until one
3860 matches. Each item on the list can be of the form
3862 domain=ip-address/key
3864 The domain is the right-most domain that is used for the query, for example,
3865 blackholes.mail-abuse.org. If the IP address is present, there is a match only
3866 if the DNS lookup returns a matching IP address. Several addresses may be
3867 given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2.
3869 If no key is given, what is looked up in the domain is the inverted IP address
3870 of the current client host. If a key is given, it is used to construct the
3871 domain for the lookup. For example:
3873 dsn.rfc-ignorant.org/$sender_address_domain
3875 After finding a match in the DNS, the domain is placed in $dnslist_domain, and
3876 then we check for a TXT record for an error message, and if found, save its
3877 value in $dnslist_text. We also cache everything in a tree, to optimize
3880 The TXT record is normally looked up in the same domain as the A record, but
3881 when many lists are combined in a single DNS domain, this will not be a very
3882 specific message. It is possible to specify a different domain for looking up
3883 TXT records; this is given before the main domain, comma-separated. For
3886 dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \
3887 socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3
3889 The caching ensures that only one lookup in dnsbl.sorbs.net is done.
3891 Note: an address for testing RBL is 192.203.178.39
3892 Note: an address for testing DUL is 192.203.178.4
3893 Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org
3897 listptr the domain/address/data list
3898 log_msgptr log message on error
3900 Returns: OK successful lookup (i.e. the address is on the list), or
3901 lookup deferred after +include_unknown
3902 FAIL name not found, or no data found for the given type, or
3903 lookup deferred after +exclude_unknown (default)
3904 DEFER lookup failure, if +defer_unknown was set
3908 verify_check_dnsbl(int where
, const uschar
** listptr
, uschar
** log_msgptr
)
3911 int defer_return
= FAIL
;
3912 const uschar
*list
= *listptr
;
3915 uschar buffer
[1024];
3916 uschar revadd
[128]; /* Long enough for IPv6 address */
3918 /* Indicate that the inverted IP address is not yet set up */
3922 /* In case this is the first time the DNS resolver is being used. */
3924 dns_init(FALSE
, FALSE
, FALSE
); /*XXX dnssec? */
3926 /* Loop through all the domains supplied, until something matches */
3928 while ((domain
= string_nextinlist(&list
, &sep
, buffer
, sizeof(buffer
))) != NULL
)
3931 BOOL bitmask
= FALSE
;
3938 HDEBUG(D_dnsbl
) debug_printf("DNS list check: %s\n", domain
);
3940 /* Deal with special values that change the behaviour on defer */
3942 if (domain
[0] == '+')
3944 if (strcmpic(domain
, US
"+include_unknown") == 0) defer_return
= OK
;
3945 else if (strcmpic(domain
, US
"+exclude_unknown") == 0) defer_return
= FAIL
;
3946 else if (strcmpic(domain
, US
"+defer_unknown") == 0) defer_return
= DEFER
;
3948 log_write(0, LOG_MAIN
|LOG_PANIC
, "unknown item in dnslist (ignored): %s",
3953 /* See if there's explicit data to be looked up */
3955 if ((key
= Ustrchr(domain
, '/'))) *key
++ = 0;
3957 /* See if there's a list of addresses supplied after the domain name. This is
3958 introduced by an = or a & character; if preceded by = we require all matches
3959 and if preceded by ! we invert the result. */
3961 if (!(iplist
= Ustrchr(domain
, '=')))
3964 iplist
= Ustrchr(domain
, '&');
3967 if (iplist
) /* Found either = or & */
3969 if (iplist
> domain
&& iplist
[-1] == '!') /* Handle preceding ! */
3971 match_type
|= MT_NOT
;
3975 *iplist
++ = 0; /* Terminate domain, move on */
3977 /* If we found = (bitmask == FALSE), check for == or =& */
3979 if (!bitmask
&& (*iplist
== '=' || *iplist
== '&'))
3981 bitmask
= *iplist
++ == '&';
3982 match_type
|= MT_ALL
;
3987 /* If there is a comma in the domain, it indicates that a second domain for
3988 looking up TXT records is provided, before the main domain. Otherwise we must
3989 set domain_txt == domain. */
3991 domain_txt
= domain
;
3992 comma
= Ustrchr(domain
, ',');
3999 /* Check that what we have left is a sensible domain name. There is no reason
4000 why these domains should in fact use the same syntax as hosts and email
4001 domains, but in practice they seem to. However, there is little point in
4002 actually causing an error here, because that would no doubt hold up incoming
4003 mail. Instead, I'll just log it. */
4005 for (s
= domain
; *s
!= 0; s
++)
4007 if (!isalnum(*s
) && *s
!= '-' && *s
!= '.' && *s
!= '_')
4009 log_write(0, LOG_MAIN
, "dnslists domain \"%s\" contains "
4010 "strange characters - is this right?", domain
);
4015 /* Check the alternate domain if present */
4017 if (domain_txt
!= domain
) for (s
= domain_txt
; *s
!= 0; s
++)
4019 if (!isalnum(*s
) && *s
!= '-' && *s
!= '.' && *s
!= '_')
4021 log_write(0, LOG_MAIN
, "dnslists domain \"%s\" contains "
4022 "strange characters - is this right?", domain_txt
);
4027 /* If there is no key string, construct the query by adding the domain name
4028 onto the inverted host address, and perform a single DNS lookup. */
4032 if (where
== ACL_WHERE_NOTSMTP_START
|| where
== ACL_WHERE_NOTSMTP
)
4034 *log_msgptr
= string_sprintf
4035 ("cannot test auto-keyed dnslists condition in %s ACL",
4036 acl_wherenames
[where
]);
4039 if (sender_host_address
== NULL
) return FAIL
; /* can never match */
4040 if (revadd
[0] == 0) invert_address(revadd
, sender_host_address
);
4041 rc
= one_check_dnsbl(domain
, domain_txt
, sender_host_address
, revadd
,
4042 iplist
, bitmask
, match_type
, defer_return
);
4045 dnslist_domain
= string_copy(domain_txt
);
4046 dnslist_matched
= string_copy(sender_host_address
);
4047 HDEBUG(D_dnsbl
) debug_printf("=> that means %s is listed at %s\n",
4048 sender_host_address
, dnslist_domain
);
4050 if (rc
!= FAIL
) return rc
; /* OK or DEFER */
4053 /* If there is a key string, it can be a list of domains or IP addresses to
4054 be concatenated with the main domain. */
4061 uschar keybuffer
[256];
4062 uschar keyrevadd
[128];
4064 while ((keydomain
= string_nextinlist(CUSS
&key
, &keysep
, keybuffer
,
4065 sizeof(keybuffer
))) != NULL
)
4067 uschar
*prepend
= keydomain
;
4069 if (string_is_ip_address(keydomain
, NULL
) != 0)
4071 invert_address(keyrevadd
, keydomain
);
4072 prepend
= keyrevadd
;
4075 rc
= one_check_dnsbl(domain
, domain_txt
, keydomain
, prepend
, iplist
,
4076 bitmask
, match_type
, defer_return
);
4080 dnslist_domain
= string_copy(domain_txt
);
4081 dnslist_matched
= string_copy(keydomain
);
4082 HDEBUG(D_dnsbl
) debug_printf("=> that means %s is listed at %s\n",
4083 keydomain
, dnslist_domain
);
4087 /* If the lookup deferred, remember this fact. We keep trying the rest
4088 of the list to see if we get a useful result, and if we don't, we return
4089 DEFER at the end. */
4091 if (rc
== DEFER
) defer
= TRUE
;
4092 } /* continue with next keystring domain/address */
4094 if (defer
) return DEFER
;
4096 } /* continue with next dnsdb outer domain */
4103 /* End of verify.c */