1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
8 /* 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_context ctctx
;
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(client_conn_ctx
*, char, uschar
**, int);
46 /*************************************************
47 * Retrieve a callout cache record *
48 *************************************************/
50 /* If a record exists, check whether it has expired.
53 dbm_file an open hints file
55 type "address" or "domain"
56 positive_expire expire time for positive records
57 negative_expire expire time for negative records
59 Returns: the cache record if a non-expired one exists, else NULL
62 static dbdata_callout_cache
*
63 get_callout_cache_record(open_db
*dbm_file
, const uschar
*key
, uschar
*type
,
64 int positive_expire
, int negative_expire
)
69 dbdata_callout_cache
*cache_record
;
71 if (!(cache_record
= dbfn_read_with_length(dbm_file
, key
, &length
)))
73 HDEBUG(D_verify
) debug_printf("callout cache: no %s record found for %s\n", type
, key
);
77 /* We treat a record as "negative" if its result field is not positive, or if
78 it is a domain record and the postmaster field is negative. */
80 negative
= cache_record
->result
!= ccache_accept
||
81 (type
[0] == 'd' && cache_record
->postmaster_result
== ccache_reject
);
82 expire
= negative
? negative_expire
: positive_expire
;
85 if (now
- cache_record
->time_stamp
> expire
)
87 HDEBUG(D_verify
) debug_printf("callout cache: %s record expired for %s\n", type
, key
);
91 /* If this is a non-reject domain record, check for the obsolete format version
92 that doesn't have the postmaster and random timestamps, by looking at the
93 length. If so, copy it to a new-style block, replicating the record's
94 timestamp. Then check the additional timestamps. (There's no point wasting
95 effort if connections are rejected.) */
97 if (type
[0] == 'd' && cache_record
->result
!= ccache_reject
)
99 if (length
== sizeof(dbdata_callout_cache_obs
))
101 dbdata_callout_cache
*new = store_get(sizeof(dbdata_callout_cache
), FALSE
);
102 memcpy(new, cache_record
, length
);
103 new->postmaster_stamp
= new->random_stamp
= new->time_stamp
;
107 if (now
- cache_record
->postmaster_stamp
> expire
)
108 cache_record
->postmaster_result
= ccache_unknown
;
110 if (now
- cache_record
->random_stamp
> expire
)
111 cache_record
->random_result
= ccache_unknown
;
114 HDEBUG(D_verify
) debug_printf("callout cache: found %s record for %s\n", type
, key
);
120 /* Check the callout cache.
121 Options * pm_mailfrom may be modified by cache partial results.
123 Return: TRUE if result found
127 cached_callout_lookup(address_item
* addr
, uschar
* address_key
,
128 uschar
* from_address
, int * opt_ptr
, uschar
** pm_ptr
,
129 int * yield
, uschar
** failure_ptr
,
130 dbdata_callout_cache
* new_domain_record
, int * old_domain_res
)
132 int options
= *opt_ptr
;
134 open_db
*dbm_file
= NULL
;
136 /* Open the callout cache database, it it exists, for reading only at this
137 stage, unless caching has been disabled. */
139 if (options
& vopt_callout_no_cache
)
141 HDEBUG(D_verify
) debug_printf("callout cache: disabled by no_cache\n");
143 else if (!(dbm_file
= dbfn_open(US
"callout", O_RDWR
, &dbblock
, FALSE
, TRUE
)))
145 HDEBUG(D_verify
) debug_printf("callout cache: not available\n");
149 /* If a cache database is available see if we can avoid the need to do an
150 actual callout by making use of previously-obtained data. */
152 dbdata_callout_cache_address
* cache_address_record
;
153 dbdata_callout_cache
* cache_record
= get_callout_cache_record(dbm_file
,
154 addr
->domain
, US
"domain",
155 callout_cache_domain_positive_expire
, callout_cache_domain_negative_expire
);
157 /* If an unexpired cache record was found for this domain, see if the callout
158 process can be short-circuited. */
162 /* In most cases, if an early command (up to and including MAIL FROM:<>)
163 was rejected, there is no point carrying on. The callout fails. However, if
164 we are doing a recipient verification with use_sender or use_postmaster
165 set, a previous failure of MAIL FROM:<> doesn't count, because this time we
166 will be using a non-empty sender. We have to remember this situation so as
167 not to disturb the cached domain value if this whole verification succeeds
168 (we don't want it turning into "accept"). */
170 *old_domain_res
= cache_record
->result
;
172 if ( cache_record
->result
== ccache_reject
173 || *from_address
== 0 && cache_record
->result
== ccache_reject_mfnull
)
176 debug_printf("callout cache: domain gave initial rejection, or "
177 "does not accept HELO or MAIL FROM:<>\n");
178 setflag(addr
, af_verify_nsfail
);
179 addr
->user_message
= US
"(result of an earlier callout reused).";
181 *failure_ptr
= US
"mail";
182 dbfn_close(dbm_file
);
186 /* If a previous check on a "random" local part was accepted, we assume
187 that the server does not do any checking on local parts. There is therefore
188 no point in doing the callout, because it will always be successful. If a
189 random check previously failed, arrange not to do it again, but preserve
190 the data in the new record. If a random check is required but hasn't been
191 done, skip the remaining cache processing. */
193 if (options
& vopt_callout_random
) switch(cache_record
->random_result
)
197 debug_printf("callout cache: domain accepts random addresses\n");
198 *failure_ptr
= US
"random";
199 dbfn_close(dbm_file
);
200 return TRUE
; /* Default yield is OK */
204 debug_printf("callout cache: domain rejects random addresses\n");
205 *opt_ptr
= options
& ~vopt_callout_random
;
206 new_domain_record
->random_result
= ccache_reject
;
207 new_domain_record
->random_stamp
= cache_record
->random_stamp
;
212 debug_printf("callout cache: need to check random address handling "
213 "(not cached or cache expired)\n");
214 dbfn_close(dbm_file
);
218 /* If a postmaster check is requested, but there was a previous failure,
219 there is again no point in carrying on. If a postmaster check is required,
220 but has not been done before, we are going to have to do a callout, so skip
221 remaining cache processing. */
225 if (cache_record
->postmaster_result
== ccache_reject
)
227 setflag(addr
, af_verify_pmfail
);
229 debug_printf("callout cache: domain does not accept "
230 "RCPT TO:<postmaster@domain>\n");
232 *failure_ptr
= US
"postmaster";
233 setflag(addr
, af_verify_pmfail
);
234 addr
->user_message
= US
"(result of earlier verification reused).";
235 dbfn_close(dbm_file
);
238 if (cache_record
->postmaster_result
== ccache_unknown
)
241 debug_printf("callout cache: need to check RCPT "
242 "TO:<postmaster@domain> (not cached or cache expired)\n");
243 dbfn_close(dbm_file
);
247 /* If cache says OK, set pm_mailfrom NULL to prevent a redundant
248 postmaster check if the address itself has to be checked. Also ensure
249 that the value in the cache record is preserved (with its old timestamp).
252 HDEBUG(D_verify
) debug_printf("callout cache: domain accepts RCPT "
253 "TO:<postmaster@domain>\n");
255 new_domain_record
->postmaster_result
= ccache_accept
;
256 new_domain_record
->postmaster_stamp
= cache_record
->postmaster_stamp
;
260 /* We can't give a result based on information about the domain. See if there
261 is an unexpired cache record for this specific address (combined with the
262 sender address if we are doing a recipient callout with a non-empty sender).
265 if (!(cache_address_record
= (dbdata_callout_cache_address
*)
266 get_callout_cache_record(dbm_file
, address_key
, US
"address",
267 callout_cache_positive_expire
, callout_cache_negative_expire
)))
269 dbfn_close(dbm_file
);
273 if (cache_address_record
->result
== ccache_accept
)
276 debug_printf("callout cache: address record is positive\n");
281 debug_printf("callout cache: address record is negative\n");
282 addr
->user_message
= US
"Previous (cached) callout verification failure";
283 *failure_ptr
= US
"recipient";
287 /* Close the cache database while we actually do the callout for real. */
289 dbfn_close(dbm_file
);
296 /* Write results to callout cache
299 cache_callout_write(dbdata_callout_cache
* dom_rec
, const uschar
* domain
,
300 int done
, dbdata_callout_cache_address
* addr_rec
, uschar
* address_key
)
303 open_db
*dbm_file
= NULL
;
305 /* If we get here with done == TRUE, a successful callout happened, and yield
306 will be set OK or FAIL according to the response to the RCPT command.
307 Otherwise, we looped through the hosts but couldn't complete the business.
308 However, there may be domain-specific information to cache in both cases.
310 The value of the result field in the new_domain record is ccache_unknown if
311 there was an error before or with MAIL FROM:, and errno was not zero,
312 implying some kind of I/O error. We don't want to write the cache in that case.
313 Otherwise the value is ccache_accept, ccache_reject, or ccache_reject_mfnull. */
315 if (dom_rec
->result
!= ccache_unknown
)
316 if (!(dbm_file
= dbfn_open(US
"callout", O_RDWR
|O_CREAT
, &dbblock
, FALSE
, TRUE
)))
318 HDEBUG(D_verify
) debug_printf("callout cache: not available\n");
322 (void)dbfn_write(dbm_file
, domain
, dom_rec
,
323 (int)sizeof(dbdata_callout_cache
));
324 HDEBUG(D_verify
) debug_printf("wrote callout cache domain record for %s:\n"
325 " result=%d postmaster=%d random=%d\n",
328 dom_rec
->postmaster_result
,
329 dom_rec
->random_result
);
332 /* If a definite result was obtained for the callout, cache it unless caching
335 if (done
&& addr_rec
->result
!= ccache_unknown
)
338 dbm_file
= dbfn_open(US
"callout", O_RDWR
|O_CREAT
, &dbblock
, FALSE
, TRUE
);
341 HDEBUG(D_verify
) debug_printf("no callout cache available\n");
345 (void)dbfn_write(dbm_file
, address_key
, addr_rec
,
346 (int)sizeof(dbdata_callout_cache_address
));
347 HDEBUG(D_verify
) debug_printf("wrote %s callout cache address record for %s\n",
348 addr_rec
->result
== ccache_accept
? "positive" : "negative",
353 if (dbm_file
) dbfn_close(dbm_file
);
357 /* Cutthrough-multi. If the existing cached cutthrough connection matches
358 the one we would make for a subsequent recipient, use it. Send the RCPT TO
359 and check the result, nonpipelined as it may be wanted immediately for
360 recipient-verification.
362 It seems simpler to deal with this case separately from the main callout loop.
363 We will need to remember it has sent, or not, so that rcpt-acl tail code
364 can do it there for the non-rcpt-verify case. For this we keep an addresscount.
366 Return: TRUE for a definitive result for the recipient
369 cutthrough_multi(address_item
* addr
, host_item
* host_list
,
370 transport_feedback
* tf
, int * yield
)
374 if (addr
->transport
== cutthrough
.addr
.transport
)
375 for (host_item
* host
= host_list
; host
; host
= host
->next
)
376 if (Ustrcmp(host
->address
, cutthrough
.host
.address
) == 0)
379 uschar
*interface
= NULL
; /* Outgoing interface to use; NULL => any */
382 deliver_host
= host
->name
;
383 deliver_host_address
= host
->address
;
384 deliver_host_port
= host
->port
;
385 deliver_domain
= addr
->domain
;
386 transport_name
= addr
->transport
->name
;
388 host_af
= Ustrchr(host
->address
, ':') ? AF_INET6
: AF_INET
;
390 if ( !smtp_get_interface(tf
->interface
, host_af
, addr
, &interface
,
392 || !smtp_get_port(tf
->port
, addr
, &port
, US
"callout")
394 log_write(0, LOG_MAIN
|LOG_PANIC
, "<%s>: %s", addr
->address
,
397 smtp_port_for_connect(host
, port
);
399 if ( ( interface
== cutthrough
.interface
401 && cutthrough
.interface
402 && Ustrcmp(interface
, cutthrough
.interface
) == 0
404 && host
->port
== cutthrough
.host
.port
407 uschar
* resp
= NULL
;
409 /* Match! Send the RCPT TO, set done from the response */
411 smtp_write_command(&ctctx
, SCMD_FLUSH
, "RCPT TO:<%.1000s>\r\n",
412 transport_rcpt_address(addr
,
413 addr
->transport
->rcpt_include_affixes
)) >= 0
414 && cutthrough_response(&cutthrough
.cctx
, '2', &resp
,
415 CUTTHROUGH_DATA_TIMEOUT
) == '2';
417 /* This would go horribly wrong if a callout fail was ignored by ACL.
418 We punt by abandoning cutthrough on a reject, like the
423 address_item
* na
= store_get(sizeof(address_item
), FALSE
);
424 *na
= cutthrough
.addr
;
425 cutthrough
.addr
= *addr
;
426 cutthrough
.addr
.host_used
= &cutthrough
.host
;
427 cutthrough
.addr
.next
= na
;
433 cancel_cutthrough_connection(TRUE
, US
"recipient rejected");
434 if (!resp
|| errno
== ETIMEDOUT
)
436 HDEBUG(D_verify
) debug_printf("SMTP timeout\n");
441 Ustrcpy(resp
, US
"connection dropped");
444 string_sprintf("response to \"%s\" was: %s",
445 big_buffer
, string_printing(resp
));
448 string_sprintf("Callout verification failed:\n%s", resp
);
450 /* Hard rejection ends the process */
452 if (resp
[0] == '5') /* Address rejected */
460 break; /* host_list */
463 cancel_cutthrough_connection(TRUE
, US
"incompatible connection");
468 /*************************************************
469 * Do callout verification for an address *
470 *************************************************/
472 /* This function is called from verify_address() when the address has routed to
473 a host list, and a callout has been requested. Callouts are expensive; that is
474 why a cache is used to improve the efficiency.
477 addr the address that's been routed
478 host_list the list of hosts to try
479 tf the transport feedback block
481 ifstring "interface" option from transport, or NULL
482 portstring "port" option from transport, or NULL
483 protocolstring "protocol" option from transport, or NULL
484 callout the per-command callout timeout
485 callout_overall the overall callout timeout (if < 0 use 4*callout)
486 callout_connect the callout connection timeout (if < 0 use callout)
487 options the verification options - these bits are used:
488 vopt_is_recipient => this is a recipient address
489 vopt_callout_no_cache => don't use callout cache
490 vopt_callout_fullpm => if postmaster check, do full one
491 vopt_callout_random => do the "random" thing
492 vopt_callout_recipsender => use real sender for recipient
493 vopt_callout_recippmaster => use postmaster for recipient
494 vopt_callout_hold => lazy close connection
495 se_mailfrom MAIL FROM address for sender verify; NULL => ""
496 pm_mailfrom if non-NULL, do the postmaster check with this sender
498 Returns: OK/FAIL/DEFER
502 do_callout(address_item
*addr
, host_item
*host_list
, transport_feedback
*tf
,
503 int callout
, int callout_overall
, int callout_connect
, int options
,
504 uschar
*se_mailfrom
, uschar
*pm_mailfrom
)
507 int old_domain_cache_result
= ccache_accept
;
510 uschar
*from_address
;
511 uschar
*random_local_part
= NULL
;
512 const uschar
*save_deliver_domain
= deliver_domain
;
513 uschar
**failure_ptr
= options
& vopt_is_recipient
514 ? &recipient_verify_failure
: &sender_verify_failure
;
515 dbdata_callout_cache new_domain_record
;
516 dbdata_callout_cache_address new_address_record
;
517 time_t callout_start_time
;
519 new_domain_record
.result
= ccache_unknown
;
520 new_domain_record
.postmaster_result
= ccache_unknown
;
521 new_domain_record
.random_result
= ccache_unknown
;
523 memset(&new_address_record
, 0, sizeof(new_address_record
));
525 /* For a recipient callout, the key used for the address cache record must
526 include the sender address if we are using the real sender in the callout,
527 because that may influence the result of the callout. */
529 if (options
& vopt_is_recipient
)
530 if (options
& vopt_callout_recipsender
)
532 from_address
= sender_address
;
533 address_key
= string_sprintf("%s/<%s>", addr
->address
, sender_address
);
534 if (cutthrough
.delivery
) options
|= vopt_callout_no_cache
;
536 else if (options
& vopt_callout_recippmaster
)
538 from_address
= string_sprintf("postmaster@%s", qualify_domain_sender
);
539 address_key
= string_sprintf("%s/<postmaster@%s>", addr
->address
,
540 qualify_domain_sender
);
545 address_key
= addr
->address
;
548 /* For a sender callout, we must adjust the key if the mailfrom address is not
553 from_address
= se_mailfrom
? se_mailfrom
: US
"";
554 address_key
= *from_address
555 ? string_sprintf("%s/<%s>", addr
->address
, from_address
) : addr
->address
;
558 if (cached_callout_lookup(addr
, address_key
, from_address
,
559 &options
, &pm_mailfrom
, &yield
, failure_ptr
,
560 &new_domain_record
, &old_domain_cache_result
))
562 cancel_cutthrough_connection(TRUE
, US
"cache-hit");
566 if (!addr
->transport
)
568 HDEBUG(D_verify
) debug_printf("cannot callout via null transport\n");
570 else if (Ustrcmp(addr
->transport
->driver_name
, "smtp") != 0)
571 log_write(0, LOG_MAIN
|LOG_PANIC
|LOG_CONFIG_FOR
, "callout transport '%s': %s is non-smtp",
572 addr
->transport
->name
, addr
->transport
->driver_name
);
575 smtp_transport_options_block
*ob
=
576 (smtp_transport_options_block
*)addr
->transport
->options_block
;
577 smtp_context
* sx
= NULL
;
579 /* The information wasn't available in the cache, so we have to do a real
580 callout and save the result in the cache for next time, unless no_cache is set,
581 or unless we have a previously cached negative random result. If we are to test
582 with a random local part, ensure that such a local part is available. If not,
583 log the fact, but carry on without randomising. */
585 if (options
& vopt_callout_random
&& callout_random_local_part
)
586 if (!(random_local_part
= expand_string(callout_random_local_part
)))
587 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to expand "
588 "callout_random_local_part: %s", expand_string_message
);
590 /* Default the connect and overall callout timeouts if not set, and record the
591 time we are starting so that we can enforce it. */
593 if (callout_overall
< 0) callout_overall
= 4 * callout
;
594 if (callout_connect
< 0) callout_connect
= callout
;
595 callout_start_time
= time(NULL
);
597 /* Before doing a real callout, if this is an SMTP connection, flush the SMTP
598 output because a callout might take some time. When PIPELINING is active and
599 there are many recipients, the total time for doing lots of callouts can add up
600 and cause the client to time out. So in this case we forgo the PIPELINING
603 if (smtp_out
&& !f
.disable_callout_flush
) mac_smtp_fflush();
605 clearflag(addr
, af_verify_pmfail
); /* postmaster callout flag */
606 clearflag(addr
, af_verify_nsfail
); /* null sender callout flag */
608 /* cutthrough-multi: if a nonfirst rcpt has the same routing as the first,
609 and we are holding a cutthrough conn open, we can just append the rcpt to
610 that conn for verification purposes (and later delivery also). Simplest
611 coding means skipping this whole loop and doing the append separately. */
613 /* Can we re-use an open cutthrough connection? */
614 if ( cutthrough
.cctx
.sock
>= 0
615 && (options
& (vopt_callout_recipsender
| vopt_callout_recippmaster
))
616 == vopt_callout_recipsender
617 && !random_local_part
620 done
= cutthrough_multi(addr
, host_list
, tf
, &yield
);
622 /* If we did not use a cached connection, make connections to the hosts
623 and do real callouts. The list of hosts is passed in as an argument. */
625 for (host_item
* host
= host_list
; host
&& !done
; host
= host
->next
)
629 uschar
* interface
= NULL
; /* Outgoing interface to use; NULL => any */
633 DEBUG(D_verify
) debug_printf("no IP address for host name %s: skipping\n",
638 /* Check the overall callout timeout */
640 if (time(NULL
) - callout_start_time
>= callout_overall
)
642 HDEBUG(D_verify
) debug_printf("overall timeout for callout exceeded\n");
646 /* Set IPv4 or IPv6 */
648 host_af
= Ustrchr(host
->address
, ':') ? AF_INET6
: AF_INET
;
650 /* Expand and interpret the interface and port strings. The latter will not
651 be used if there is a host-specific port (e.g. from a manualroute router).
652 This has to be delayed till now, because they may expand differently for
653 different hosts. If there's a failure, log it, but carry on with the
656 deliver_host
= host
->name
;
657 deliver_host_address
= host
->address
;
658 deliver_host_port
= host
->port
;
659 deliver_domain
= addr
->domain
;
660 transport_name
= addr
->transport
->name
;
662 if ( !smtp_get_interface(tf
->interface
, host_af
, addr
, &interface
,
664 || !smtp_get_port(tf
->port
, addr
, &port
, US
"callout")
666 log_write(0, LOG_MAIN
|LOG_PANIC
, "<%s>: %s", addr
->address
,
669 if (!sx
) sx
= store_get(sizeof(*sx
), TRUE
); /* tainted buffers */
670 memset(sx
, 0, sizeof(*sx
));
673 sx
->conn_args
.host
= host
;
674 sx
->conn_args
.host_af
= host_af
,
676 sx
->conn_args
.interface
= interface
;
677 sx
->helo_data
= tf
->helo_data
;
678 sx
->conn_args
.tblock
= addr
->transport
;
681 tls_retry_connection
:
682 /* Set the address state so that errors are recorded in it */
684 addr
->transport_return
= PENDING_DEFER
;
685 ob
->connect_timeout
= callout_connect
;
686 ob
->command_timeout
= callout
;
688 /* Get the channel set up ready for a message (MAIL FROM being the next
689 SMTP command to send. If we tried TLS but it failed, try again without
692 yield
= smtp_setup_conn(sx
, FALSE
);
695 && addr
->basic_errno
== ERRNO_TLSFAILURE
696 && ob
->tls_tempfail_tryclear
697 && verify_check_given_host(CUSS
&ob
->hosts_require_tls
, host
) != OK
700 log_write(0, LOG_MAIN
,
701 "%s: callout unencrypted to %s [%s] (not in hosts_require_tls)",
702 addr
->message
, host
->name
, host
->address
);
703 addr
->transport_return
= PENDING_DEFER
;
704 yield
= smtp_setup_conn(sx
, TRUE
);
709 errno
= addr
->basic_errno
;
710 transport_name
= NULL
;
711 deliver_host
= deliver_host_address
= NULL
;
712 deliver_domain
= save_deliver_domain
;
714 /* Failure to accept HELO is cached; this blocks the whole domain for all
715 senders. I/O errors and defer responses are not cached. */
717 if (yield
== FAIL
&& (errno
== 0 || errno
== ERRNO_SMTPCLOSED
))
719 setflag(addr
, af_verify_nsfail
);
720 new_domain_record
.result
= ccache_reject
;
728 /* If we needed to authenticate, smtp_setup_conn() did that. Copy
729 the AUTH info for logging */
731 addr
->authenticator
= client_authenticator
;
732 addr
->auth_id
= client_authenticated_id
;
734 sx
->from_addr
= from_address
;
735 sx
->first_addr
= sx
->sync_addr
= addr
;
736 sx
->ok
= FALSE
; /*XXX these 3 last might not be needed for verify? */
737 sx
->send_rset
= TRUE
;
738 sx
->completed_addr
= FALSE
;
740 new_domain_record
.result
= old_domain_cache_result
== ccache_reject_mfnull
741 ? ccache_reject_mfnull
: ccache_accept
;
743 /* Do the random local part check first. Temporarily replace the recipient
744 with the "random" value */
746 if (random_local_part
)
748 uschar
* main_address
= addr
->address
;
749 const uschar
* rcpt_domain
= addr
->domain
;
752 uschar
* errstr
= NULL
;
753 if ( testflag(addr
, af_utf8_downcvt
)
754 && (rcpt_domain
= string_domain_utf8_to_alabel(rcpt_domain
,
758 addr
->message
= errstr
;
759 errno
= ERRNO_EXPANDFAIL
;
760 setflag(addr
, af_verify_nsfail
);
762 rcpt_domain
= US
""; /*XXX errorhandling! */
766 /* This would be ok for 1st rcpt of a cutthrough (the case handled here;
767 subsequents are done in cutthrough_multi()), but no way to
768 handle a subsequent because of the RSET vaporising the MAIL FROM.
769 So refuse to support any. Most cutthrough use will not involve
770 random_local_part, so no loss. */
771 cancel_cutthrough_connection(TRUE
, US
"random-recipient");
773 addr
->address
= string_sprintf("%s@%.1000s",
774 random_local_part
, rcpt_domain
);
777 /* If accepted, we aren't going to do any further tests below.
778 Otherwise, cache a real negative response, and get back to the right
779 state to send RCPT. Unless there's some problem such as a dropped
780 connection, we expect to succeed, because the commands succeeded above.
781 However, some servers drop the connection after responding to an
782 invalid recipient, so on (any) error we drop and remake the connection.
783 XXX We don't care about that for postmaster_full. Should we?
785 XXX could we add another flag to the context, and have the common
786 code emit the RSET too? Even pipelined after the RCPT...
787 Then the main-verify call could use it if there's to be a subsequent
789 The sync_responses() would need to be taught about it and we'd
790 need another return code filtering out to here.
792 Avoid using a SIZE option on the MAIL for all random-rcpt checks.
795 sx
->avoid_option
= OPTION_SIZE
;
797 /* Remember when we last did a random test */
798 new_domain_record
.random_stamp
= time(NULL
);
800 if (smtp_write_mail_and_rcpt_cmds(sx
, &yield
) == 0)
801 switch(addr
->transport_return
)
803 case PENDING_OK
: /* random was accepted, unfortunately */
804 new_domain_record
.random_result
= ccache_accept
;
805 yield
= OK
; /* Only usable verify result we can return */
807 *failure_ptr
= US
"random";
809 case FAIL
: /* rejected: the preferred result */
810 new_domain_record
.random_result
= ccache_reject
;
811 sx
->avoid_option
= 0;
813 /* Between each check, issue RSET, because some servers accept only
814 one recipient after MAIL FROM:<>.
815 XXX We don't care about that for postmaster_full. Should we? */
818 smtp_write_command(sx
, SCMD_FLUSH
, "RSET\r\n") >= 0 &&
819 smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2', callout
)))
823 debug_printf_indent("problem after random/rset/mfrom; reopen conn\n");
824 random_local_part
= NULL
;
826 tls_close(sx
->cctx
.tls_ctx
, TLS_SHUTDOWN_NOWAIT
);
828 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf_indent(" SMTP(close)>>\n");
829 (void)close(sx
->cctx
.sock
);
831 #ifndef DISABLE_EVENT
832 (void) event_raise(addr
->transport
->event_action
,
833 US
"tcp:close", NULL
);
835 addr
->address
= main_address
;
836 addr
->transport_return
= PENDING_DEFER
;
837 sx
->first_addr
= sx
->sync_addr
= addr
;
839 sx
->send_rset
= TRUE
;
840 sx
->completed_addr
= FALSE
;
841 goto tls_retry_connection
;
842 case DEFER
: /* 4xx response to random */
843 break; /* Just to be clear. ccache_unknown, !done. */
846 /* Re-setup for main verify, or for the error message when failing */
847 addr
->address
= main_address
;
848 addr
->transport_return
= PENDING_DEFER
;
849 sx
->first_addr
= sx
->sync_addr
= addr
;
851 sx
->send_rset
= TRUE
;
852 sx
->completed_addr
= FALSE
;
857 /* Main verify. For rcpt-verify use SIZE if we know it and we're not cacheing;
858 for sndr-verify never use it. */
862 if (!(options
& vopt_is_recipient
&& options
& vopt_callout_no_cache
))
863 sx
->avoid_option
= OPTION_SIZE
;
866 switch(smtp_write_mail_and_rcpt_cmds(sx
, &yield
))
868 case 0: switch(addr
->transport_return
) /* ok so far */
870 case PENDING_OK
: done
= TRUE
;
871 new_address_record
.result
= ccache_accept
;
873 case FAIL
: done
= TRUE
;
875 *failure_ptr
= US
"recipient";
876 new_address_record
.result
= ccache_reject
;
882 case -1: /* MAIL response error */
883 *failure_ptr
= US
"mail";
884 if (errno
== 0 && sx
->buffer
[0] == '5')
886 setflag(addr
, af_verify_nsfail
);
887 if (from_address
[0] == 0)
888 new_domain_record
.result
= ccache_reject_mfnull
;
891 /* non-MAIL read i/o error */
892 /* non-MAIL response timeout */
893 /* internal error; channel still usable */
894 default: break; /* transmit failed */
898 addr
->auth_sndr
= client_authenticated_sender
;
900 deliver_host
= deliver_host_address
= NULL
;
901 deliver_domain
= save_deliver_domain
;
903 /* Do postmaster check if requested; if a full check is required, we
904 check for RCPT TO:<postmaster> (no domain) in accordance with RFC 821. */
906 if (done
&& pm_mailfrom
)
908 /* Could possibly shift before main verify, just above, and be ok
909 for cutthrough. But no way to handle a subsequent rcpt, so just
911 cancel_cutthrough_connection(TRUE
, US
"postmaster verify");
912 HDEBUG(D_acl
|D_v
) debug_printf_indent("Cutthrough cancelled by presence of postmaster verify\n");
914 done
= smtp_write_command(sx
, SCMD_FLUSH
, "RSET\r\n") >= 0
915 && smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2', callout
);
919 uschar
* main_address
= addr
->address
;
921 /*XXX oops, affixes */
922 addr
->address
= string_sprintf("postmaster@%.1000s", addr
->domain
);
923 addr
->transport_return
= PENDING_DEFER
;
925 sx
->from_addr
= pm_mailfrom
;
926 sx
->first_addr
= sx
->sync_addr
= addr
;
928 sx
->send_rset
= TRUE
;
929 sx
->completed_addr
= FALSE
;
930 sx
->avoid_option
= OPTION_SIZE
;
932 if( smtp_write_mail_and_rcpt_cmds(sx
, &yield
) == 0
933 && addr
->transport_return
== PENDING_OK
937 done
= (options
& vopt_callout_fullpm
) != 0
938 && smtp_write_command(sx
, SCMD_FLUSH
,
939 "RCPT TO:<postmaster>\r\n") >= 0
940 && smtp_read_response(sx
, sx
->buffer
,
941 sizeof(sx
->buffer
), '2', callout
);
943 /* Sort out the cache record */
945 new_domain_record
.postmaster_stamp
= time(NULL
);
948 new_domain_record
.postmaster_result
= ccache_accept
;
949 else if (errno
== 0 && sx
->buffer
[0] == '5')
951 *failure_ptr
= US
"postmaster";
952 setflag(addr
, af_verify_pmfail
);
953 new_domain_record
.postmaster_result
= ccache_reject
;
956 addr
->address
= main_address
;
959 /* For any failure of the main check, other than a negative response, we just
960 close the connection and carry on. We can identify a negative response by the
961 fact that errno is zero. For I/O errors it will be non-zero
963 Set up different error texts for logging and for sending back to the caller
964 as an SMTP response. Log in all cases, using a one-line format. For sender
965 callouts, give a full response to the caller, but for recipient callouts,
966 don't give the IP address because this may be an internal host whose identity
967 is not to be widely broadcast. */
973 HDEBUG(D_verify
) debug_printf("SMTP timeout\n");
974 sx
->send_quit
= FALSE
;
980 extern int acl_where
; /* src/acl.c */
982 addr
->message
= US
"response to \"EHLO\" did not include SMTPUTF8";
983 addr
->user_message
= acl_where
== ACL_WHERE_RCPT
984 ? US
"533 no support for internationalised mailbox name"
985 : US
"550 mailbox unavailable";
992 sx
->send_quit
= FALSE
;
996 if (*sx
->buffer
== 0) Ustrcpy(sx
->buffer
, US
"connection dropped");
998 /*XXX test here is ugly; seem to have a split of responsibility for
999 building this message. Need to rationalise. Where is it done
1000 before here, and when not?
1001 Not == 5xx resp to MAIL on main-verify
1003 if (!addr
->message
) addr
->message
=
1004 string_sprintf("response to \"%s\" was: %s",
1005 big_buffer
, string_printing(sx
->buffer
));
1007 /* RFC 5321 section 4.2: the text portion of the response may have only
1008 HT, SP, Printable US-ASCII. Deal with awkward chars by cutting the
1009 received message off before passing it onward. Newlines are ok; they
1010 just become a multiline response (but wrapped in the error code we
1013 for (uschar
* s
= sx
->buffer
;
1014 *s
&& s
< sx
->buffer
+ sizeof(sx
->buffer
);
1018 if (c
!= '\t' && c
!= '\n' && (c
< ' ' || c
> '~'))
1020 if (s
- sx
->buffer
< sizeof(sx
->buffer
) - 12)
1021 memcpy(s
, "(truncated)", 12);
1027 addr
->user_message
= options
& vopt_is_recipient
1028 ? string_sprintf("Callout verification failed:\n%s", sx
->buffer
)
1029 : string_sprintf("Called: %s\nSent: %s\nResponse: %s",
1030 host
->address
, big_buffer
, sx
->buffer
);
1032 /* Hard rejection ends the process */
1034 if (sx
->buffer
[0] == '5') /* Address rejected */
1042 /* End the SMTP conversation and close the connection. */
1044 /* Cutthrough - on a successful connect and recipient-verify with
1045 use-sender and we are 1st rcpt and have no cutthrough conn so far
1046 here is where we want to leave the conn open. Ditto for a lazy-close
1049 if (cutthrough
.delivery
)
1051 if (addr
->transport
->filter_command
)
1053 cutthrough
.delivery
= FALSE
;
1054 HDEBUG(D_acl
|D_v
) debug_printf("Cutthrough cancelled by presence of transport filter\n");
1056 #ifndef DISABLE_DKIM
1057 if (ob
->dkim
.dkim_domain
)
1059 cutthrough
.delivery
= FALSE
;
1060 HDEBUG(D_acl
|D_v
) debug_printf("Cutthrough cancelled by presence of DKIM signing\n");
1063 #ifdef EXPERIMENTAL_ARC
1066 cutthrough
.delivery
= FALSE
;
1067 HDEBUG(D_acl
|D_v
) debug_printf("Cutthrough cancelled by presence of ARC signing\n");
1072 if ( (cutthrough
.delivery
|| options
& vopt_callout_hold
)
1076 && (options
& (vopt_callout_recipsender
|vopt_callout_recippmaster
|vopt_success_on_redirect
))
1077 == vopt_callout_recipsender
1078 && !random_local_part
1080 && cutthrough
.cctx
.sock
< 0
1084 HDEBUG(D_acl
|D_v
) debug_printf_indent("holding verify callout open for %s\n",
1086 ? "cutthrough delivery" : "potential further verifies and delivery");
1088 cutthrough
.callout_hold_only
= !cutthrough
.delivery
;
1089 cutthrough
.is_tls
= tls_out
.active
.sock
>= 0;
1090 /* We assume no buffer in use in the outblock */
1091 cutthrough
.cctx
= sx
->cctx
;
1092 cutthrough
.nrcpt
= 1;
1093 cutthrough
.transport
= addr
->transport
->name
;
1094 cutthrough
.interface
= interface
;
1095 cutthrough
.snd_port
= sending_port
;
1096 cutthrough
.peer_options
= smtp_peer_options
;
1097 cutthrough
.host
= *host
;
1099 int oldpool
= store_pool
;
1100 store_pool
= POOL_PERM
;
1101 cutthrough
.snd_ip
= string_copy(sending_ip_address
);
1102 cutthrough
.host
.name
= string_copy(host
->name
);
1103 cutthrough
.host
.address
= string_copy(host
->address
);
1104 store_pool
= oldpool
;
1107 /* Save the address_item and parent chain for later logging */
1108 cutthrough
.addr
= *addr
;
1109 cutthrough
.addr
.next
= NULL
;
1110 cutthrough
.addr
.host_used
= &cutthrough
.host
;
1111 for (address_item
* caddr
= &cutthrough
.addr
, * parent
= addr
->parent
;
1113 caddr
= caddr
->parent
, parent
= parent
->parent
)
1114 *(caddr
->parent
= store_get(sizeof(address_item
), FALSE
)) = *parent
;
1116 ctctx
.outblock
.buffer
= ctbuffer
;
1117 ctctx
.outblock
.buffersize
= sizeof(ctbuffer
);
1118 ctctx
.outblock
.ptr
= ctbuffer
;
1119 /* ctctx.outblock.cmd_count = 0; ctctx.outblock.authenticating = FALSE; */
1120 ctctx
.outblock
.cctx
= &cutthrough
.cctx
;
1124 /* Ensure no cutthrough on multiple verifies that were incompatible */
1125 if (options
& vopt_callout_recipsender
)
1126 cancel_cutthrough_connection(TRUE
, US
"not usable for cutthrough");
1128 if (smtp_write_command(sx
, SCMD_FLUSH
, "QUIT\r\n") != -1)
1129 /* Wait a short time for response, and discard it */
1130 smtp_read_response(sx
, sx
->buffer
, sizeof(sx
->buffer
), '2', 1);
1132 if (sx
->cctx
.sock
>= 0)
1135 if (sx
->cctx
.tls_ctx
)
1137 tls_close(sx
->cctx
.tls_ctx
, TLS_SHUTDOWN_NOWAIT
);
1138 sx
->cctx
.tls_ctx
= NULL
;
1141 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf_indent(" SMTP(close)>>\n");
1142 (void)close(sx
->cctx
.sock
);
1144 #ifndef DISABLE_EVENT
1145 (void) event_raise(addr
->transport
->event_action
, US
"tcp:close", NULL
);
1150 if (!done
|| yield
!= OK
)
1151 addr
->message
= string_sprintf("%s [%s] : %s", host
->name
, host
->address
,
1153 } /* Loop through all hosts, while !done */
1156 /* If we get here with done == TRUE, a successful callout happened, and yield
1157 will be set OK or FAIL according to the response to the RCPT command.
1158 Otherwise, we looped through the hosts but couldn't complete the business.
1159 However, there may be domain-specific information to cache in both cases. */
1161 if (!(options
& vopt_callout_no_cache
))
1162 cache_callout_write(&new_domain_record
, addr
->domain
,
1163 done
, &new_address_record
, address_key
);
1165 /* Failure to connect to any host, or any response other than 2xx or 5xx is a
1166 temporary error. If there was only one host, and a response was received, leave
1167 it alone if supplying details. Otherwise, give a generic response. */
1171 uschar
* dullmsg
= string_sprintf("Could not complete %s verify callout",
1172 options
& vopt_is_recipient
? "recipient" : "sender");
1175 addr
->message
= host_list
->next
|| !addr
->message
1176 ? dullmsg
: string_sprintf("%s: %s", dullmsg
, addr
->message
);
1178 addr
->user_message
= smtp_return_error_details
1179 ? string_sprintf("%s for <%s>.\n"
1180 "The mail server(s) for the domain may be temporarily unreachable, or\n"
1181 "they may be permanently unreachable from this server. In the latter case,\n%s",
1182 dullmsg
, addr
->address
,
1183 options
& vopt_is_recipient
1184 ? "the address will never be accepted."
1185 : "you need to change the address or create an MX record for its domain\n"
1186 "if it is supposed to be generally accessible from the Internet.\n"
1187 "Talk to your mail administrator for details.")
1190 /* Force a specific error code */
1192 addr
->basic_errno
= ERRNO_CALLOUTDEFER
;
1195 /* Come here from within the cache-reading code on fast-track exit. */
1198 tls_modify_variables(&tls_in
); /* return variables to inbound values */
1204 /* Called after recipient-acl to get a cutthrough connection open when
1205 one was requested and a recipient-verify wasn't subsequently done.
1208 open_cutthrough_connection(address_item
* addr
)
1213 /* Use a recipient-verify-callout to set up the cutthrough connection. */
1214 /* We must use a copy of the address for verification, because it might
1218 HDEBUG(D_acl
) debug_printf_indent("----------- %s cutthrough setup ------------\n",
1219 rcpt_count
> 1 ? "more" : "start");
1220 rc
= verify_address(&addr2
, NULL
,
1221 vopt_is_recipient
| vopt_callout_recipsender
| vopt_callout_no_cache
,
1222 CUTTHROUGH_CMD_TIMEOUT
, -1, -1,
1224 addr
->message
= addr2
.message
;
1225 addr
->user_message
= addr2
.user_message
;
1226 HDEBUG(D_acl
) debug_printf_indent("----------- end cutthrough setup ------------\n");
1232 /* Send given number of bytes from the buffer */
1234 cutthrough_send(int n
)
1236 if(cutthrough
.cctx
.sock
< 0)
1242 ? tls_write(cutthrough
.cctx
.tls_ctx
, ctctx
.outblock
.buffer
, n
, FALSE
)
1245 send(cutthrough
.cctx
.sock
, ctctx
.outblock
.buffer
, n
, 0) > 0
1248 transport_count
+= n
;
1249 ctctx
.outblock
.ptr
= ctctx
.outblock
.buffer
;
1253 HDEBUG(D_transport
|D_acl
) debug_printf_indent("cutthrough_send failed: %s\n", strerror(errno
));
1260 _cutthrough_puts(uschar
* cp
, int n
)
1264 if(ctctx
.outblock
.ptr
>= ctctx
.outblock
.buffer
+ctctx
.outblock
.buffersize
)
1265 if(!cutthrough_send(ctctx
.outblock
.buffersize
))
1268 *ctctx
.outblock
.ptr
++ = *cp
++;
1273 /* Buffered output of counted data block. Return boolean success */
1275 cutthrough_puts(uschar
* cp
, int n
)
1277 if (cutthrough
.cctx
.sock
< 0) return TRUE
;
1278 if (_cutthrough_puts(cp
, n
)) return TRUE
;
1279 cancel_cutthrough_connection(TRUE
, US
"transmit failed");
1284 cutthrough_data_puts(uschar
* cp
, int n
)
1286 if (cutthrough
.delivery
) (void) cutthrough_puts(cp
, n
);
1292 _cutthrough_flush_send(void)
1294 int n
= ctctx
.outblock
.ptr
- ctctx
.outblock
.buffer
;
1297 if(!cutthrough_send(n
))
1303 /* Send out any bufferred output. Return boolean success. */
1305 cutthrough_flush_send(void)
1307 if (_cutthrough_flush_send()) return TRUE
;
1308 cancel_cutthrough_connection(TRUE
, US
"transmit failed");
1314 cutthrough_put_nl(void)
1316 return cutthrough_puts(US
"\r\n", 2);
1321 cutthrough_data_put_nl(void)
1323 cutthrough_data_puts(US
"\r\n", 2);
1327 /* Get and check response from cutthrough target */
1329 cutthrough_response(client_conn_ctx
* cctx
, char expect
, uschar
** copy
, int timeout
)
1331 smtp_context sx
= {0};
1332 uschar inbuffer
[4096];
1333 uschar responsebuffer
[4096];
1335 sx
.inblock
.buffer
= inbuffer
;
1336 sx
.inblock
.buffersize
= sizeof(inbuffer
);
1337 sx
.inblock
.ptr
= inbuffer
;
1338 sx
.inblock
.ptrend
= inbuffer
;
1339 sx
.inblock
.cctx
= cctx
;
1340 if(!smtp_read_response(&sx
, responsebuffer
, sizeof(responsebuffer
), expect
, timeout
))
1341 cancel_cutthrough_connection(TRUE
, US
"target timeout on read");
1346 *copy
= cp
= string_copy(responsebuffer
);
1347 /* Trim the trailing end of line */
1348 cp
+= Ustrlen(responsebuffer
);
1349 if(cp
> *copy
&& cp
[-1] == '\n') *--cp
= '\0';
1350 if(cp
> *copy
&& cp
[-1] == '\r') *--cp
= '\0';
1353 return responsebuffer
[0];
1357 /* Negotiate dataphase with the cutthrough target, returning success boolean */
1359 cutthrough_predata(void)
1361 if(cutthrough
.cctx
.sock
< 0 || cutthrough
.callout_hold_only
)
1364 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf_indent(" SMTP>> DATA\n");
1365 cutthrough_puts(US
"DATA\r\n", 6);
1366 cutthrough_flush_send();
1368 /* Assume nothing buffered. If it was it gets ignored. */
1369 return cutthrough_response(&cutthrough
.cctx
, '3', NULL
, CUTTHROUGH_DATA_TIMEOUT
) == '3';
1373 /* tctx arg only to match write_chunk() */
1375 cutthrough_write_chunk(transport_ctx
* tctx
, uschar
* s
, int len
)
1378 while(s
&& (s2
= Ustrchr(s
, '\n')))
1380 if(!cutthrough_puts(s
, s2
-s
) || !cutthrough_put_nl())
1388 /* Buffered send of headers. Return success boolean. */
1389 /* Expands newlines to wire format (CR,NL). */
1390 /* Also sends header-terminating blank line. */
1392 cutthrough_headers_send(void)
1396 if(cutthrough
.cctx
.sock
< 0 || cutthrough
.callout_hold_only
)
1399 /* We share a routine with the mainline transport to handle header add/remove/rewrites,
1400 but having a separate buffered-output function (for now)
1402 HDEBUG(D_acl
) debug_printf_indent("----------- start cutthrough headers send -----------\n");
1404 tctx
.u
.fd
= cutthrough
.cctx
.sock
;
1405 tctx
.tblock
= cutthrough
.addr
.transport
;
1406 tctx
.addr
= &cutthrough
.addr
;
1407 tctx
.check_string
= US
".";
1408 tctx
.escape_string
= US
"..";
1409 /*XXX check under spool_files_wireformat. Might be irrelevant */
1410 tctx
.options
= topt_use_crlf
;
1412 if (!transport_headers_send(&tctx
, &cutthrough_write_chunk
))
1415 HDEBUG(D_acl
) debug_printf_indent("----------- done cutthrough headers send ------------\n");
1421 close_cutthrough_connection(const uschar
* why
)
1423 int fd
= cutthrough
.cctx
.sock
;
1426 /* We could be sending this after a bunch of data, but that is ok as
1427 the only way to cancel the transfer in dataphase is to drop the tcp
1428 conn before the final dot.
1430 client_conn_ctx tmp_ctx
= cutthrough
.cctx
;
1431 ctctx
.outblock
.ptr
= ctbuffer
;
1432 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf_indent(" SMTP>> QUIT\n");
1433 _cutthrough_puts(US
"QUIT\r\n", 6); /* avoid recursion */
1434 _cutthrough_flush_send();
1435 cutthrough
.cctx
.sock
= -1; /* avoid recursion via read timeout */
1436 cutthrough
.nrcpt
= 0; /* permit re-cutthrough on subsequent message */
1438 /* Wait a short time for response, and discard it */
1439 cutthrough_response(&tmp_ctx
, '2', NULL
, 1);
1442 if (cutthrough
.is_tls
)
1444 tls_close(cutthrough
.cctx
.tls_ctx
, TLS_SHUTDOWN_NOWAIT
);
1445 cutthrough
.cctx
.tls_ctx
= NULL
;
1446 cutthrough
.is_tls
= FALSE
;
1449 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf_indent(" SMTP(close)>>\n");
1451 HDEBUG(D_acl
) debug_printf_indent("----------- cutthrough shutdown (%s) ------------\n", why
);
1453 ctctx
.outblock
.ptr
= ctbuffer
;
1457 cancel_cutthrough_connection(BOOL close_noncutthrough_verifies
, const uschar
* why
)
1459 if (cutthrough
.delivery
|| close_noncutthrough_verifies
)
1460 close_cutthrough_connection(why
);
1461 cutthrough
.delivery
= cutthrough
.callout_hold_only
= FALSE
;
1466 release_cutthrough_connection(const uschar
* why
)
1468 if (cutthrough
.cctx
.sock
< 0) return;
1469 HDEBUG(D_acl
) debug_printf_indent("release cutthrough conn: %s\n", why
);
1470 cutthrough
.cctx
.sock
= -1;
1471 cutthrough
.cctx
.tls_ctx
= NULL
;
1472 cutthrough
.delivery
= cutthrough
.callout_hold_only
= FALSE
;
1478 /* Have senders final-dot. Send one to cutthrough target, and grab the response.
1479 Log an OK response as a transmission.
1480 Close the connection.
1481 Return smtp response-class digit.
1484 cutthrough_finaldot(void)
1487 HDEBUG(D_transport
|D_acl
|D_v
) debug_printf_indent(" SMTP>> .\n");
1489 /* Assume data finshed with new-line */
1490 if( !cutthrough_puts(US
".", 1)
1491 || !cutthrough_put_nl()
1492 || !cutthrough_flush_send()
1494 return cutthrough
.addr
.message
;
1496 res
= cutthrough_response(&cutthrough
.cctx
, '2', &cutthrough
.addr
.message
,
1497 CUTTHROUGH_DATA_TIMEOUT
);
1498 for (address_item
* addr
= &cutthrough
.addr
; addr
; addr
= addr
->next
)
1500 addr
->message
= cutthrough
.addr
.message
;
1504 delivery_log(LOG_MAIN
, addr
, (int)'>', NULL
);
1505 close_cutthrough_connection(US
"delivered");
1509 delivery_log(LOG_MAIN
, addr
, 0,
1510 US
"tmp-reject from cutthrough after DATA:");
1514 delivery_log(LOG_MAIN
|LOG_REJECT
, addr
, 0,
1515 US
"rejected after DATA:");
1522 return cutthrough
.addr
.message
;
1527 /*************************************************
1528 * Copy error to toplevel address *
1529 *************************************************/
1531 /* This function is used when a verify fails or defers, to ensure that the
1532 failure or defer information is in the original toplevel address. This applies
1533 when an address is redirected to a single new address, and the failure or
1534 deferral happens to the child address.
1537 vaddr the verify address item
1538 addr the final address item
1541 Returns: the value of YIELD
1545 copy_error(address_item
*vaddr
, address_item
*addr
, int yield
)
1549 vaddr
->message
= addr
->message
;
1550 vaddr
->user_message
= addr
->user_message
;
1551 vaddr
->basic_errno
= addr
->basic_errno
;
1552 vaddr
->more_errno
= addr
->more_errno
;
1553 vaddr
->prop
.address_data
= addr
->prop
.address_data
;
1554 vaddr
->prop
.variables
= NULL
;
1555 tree_dup((tree_node
**)&vaddr
->prop
.variables
, addr
->prop
.variables
);
1556 copyflag(vaddr
, addr
, af_pass_message
);
1564 /**************************************************
1565 * printf that automatically handles TLS if needed *
1566 ***************************************************/
1568 /* This function is used by verify_address() as a substitute for all fprintf()
1569 calls; a direct fprintf() will not produce output in a TLS SMTP session, such
1570 as a response to an EXPN command. smtp_in.c makes smtp_printf available but
1571 that assumes that we always use the smtp_out FILE* when not using TLS or the
1572 ssl buffer when we are. Instead we take a FILE* parameter and check to see if
1573 that is smtp_out; if so, smtp_printf() with TLS support, otherwise regular
1577 f the candidate FILE* to write to
1578 format format string
1579 ... optional arguments
1585 static void PRINTF_FUNCTION(2,3)
1586 respond_printf(FILE *f
, const char *format
, ...)
1590 va_start(ap
, format
);
1591 if (smtp_out
&& (f
== smtp_out
))
1592 smtp_vprintf(format
, FALSE
, ap
);
1594 vfprintf(f
, format
, ap
);
1600 /*************************************************
1601 * Verify an email address *
1602 *************************************************/
1604 /* This function is used both for verification (-bv and at other times) and
1605 address testing (-bt), which is indicated by address_test_mode being set.
1608 vaddr contains the address to verify; the next field in this block
1610 f if not NULL, write the result to this file
1611 options various option bits:
1612 vopt_fake_sender => this sender verify is not for the real
1613 sender (it was verify=sender=xxxx or an address from a
1614 header line) - rewriting must not change sender_address
1615 vopt_is_recipient => this is a recipient address, otherwise
1616 it's a sender address - this affects qualification and
1617 rewriting and messages from callouts
1618 vopt_qualify => qualify an unqualified address; else error
1619 vopt_expn => called from SMTP EXPN command
1620 vopt_success_on_redirect => when a new address is generated
1621 the verification instantly succeeds
1623 These ones are used by do_callout() -- the options variable
1626 vopt_callout_fullpm => if postmaster check, do full one
1627 vopt_callout_no_cache => don't use callout cache
1628 vopt_callout_random => do the "random" thing
1629 vopt_callout_recipsender => use real sender for recipient
1630 vopt_callout_recippmaster => use postmaster for recipient
1632 callout if > 0, specifies that callout is required, and gives timeout
1633 for individual commands
1634 callout_overall if > 0, gives overall timeout for the callout function;
1635 if < 0, a default is used (see do_callout())
1636 callout_connect the connection timeout for callouts
1637 se_mailfrom when callout is requested to verify a sender, use this
1638 in MAIL FROM; NULL => ""
1639 pm_mailfrom when callout is requested, if non-NULL, do the postmaster
1640 thing and use this as the sender address (may be "")
1642 routed if not NULL, set TRUE if routing succeeded, so we can
1643 distinguish between routing failed and callout failed
1645 Returns: OK address verified
1646 FAIL address failed to verify
1647 DEFER can't tell at present
1651 verify_address(address_item
* vaddr
, FILE * fp
, int options
, int callout
,
1652 int callout_overall
, int callout_connect
, uschar
* se_mailfrom
,
1653 uschar
*pm_mailfrom
, BOOL
*routed
)
1656 BOOL full_info
= fp
? debug_selector
!= 0 : FALSE
;
1657 BOOL expn
= (options
& vopt_expn
) != 0;
1658 BOOL success_on_redirect
= (options
& vopt_success_on_redirect
) != 0;
1661 int verify_type
= expn
? v_expn
:
1662 f
.address_test_mode
? v_none
:
1663 options
& vopt_is_recipient
? v_recipient
: v_sender
;
1664 address_item
*addr_list
;
1665 address_item
*addr_new
= NULL
;
1666 address_item
*addr_remote
= NULL
;
1667 address_item
*addr_local
= NULL
;
1668 address_item
*addr_succeed
= NULL
;
1669 uschar
**failure_ptr
= options
& vopt_is_recipient
1670 ? &recipient_verify_failure
: &sender_verify_failure
;
1671 uschar
*ko_prefix
, *cr
;
1672 uschar
*address
= vaddr
->address
;
1673 uschar
*save_sender
;
1674 uschar null_sender
[] = { 0 }; /* Ensure writeable memory */
1676 /* Clear, just in case */
1678 *failure_ptr
= NULL
;
1680 /* Set up a prefix and suffix for error message which allow us to use the same
1681 output statements both in EXPN mode (where an SMTP response is needed) and when
1682 debugging with an output file. */
1686 ko_prefix
= US
"553 ";
1689 else ko_prefix
= cr
= US
"";
1691 /* Add qualify domain if permitted; otherwise an unqualified address fails. */
1693 if (parse_find_at(address
) == NULL
)
1695 if (!(options
& vopt_qualify
))
1698 respond_printf(fp
, "%sA domain is required for \"%s\"%s\n",
1699 ko_prefix
, address
, cr
);
1700 *failure_ptr
= US
"qualify";
1703 address
= rewrite_address_qualify(address
, options
& vopt_is_recipient
);
1708 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1709 debug_printf("%s %s\n", f
.address_test_mode
? "Testing" : "Verifying", address
);
1712 /* Rewrite and report on it. Clear the domain and local part caches - these
1713 may have been set by domains and local part tests during an ACL. */
1715 if (global_rewrite_rules
)
1717 uschar
*old
= address
;
1718 address
= rewrite_address(address
, options
& vopt_is_recipient
, FALSE
,
1719 global_rewrite_rules
, rewrite_existflags
);
1722 for (int i
= 0; i
< (MAX_NAMED_LIST
* 2)/32; i
++) vaddr
->localpart_cache
[i
] = 0;
1723 for (int i
= 0; i
< (MAX_NAMED_LIST
* 2)/32; i
++) vaddr
->domain_cache
[i
] = 0;
1724 if (fp
&& !expn
) fprintf(fp
, "Address rewritten as: %s\n", address
);
1728 /* If this is the real sender address, we must update sender_address at
1729 this point, because it may be referred to in the routers. */
1731 if (!(options
& (vopt_fake_sender
|vopt_is_recipient
)))
1732 sender_address
= address
;
1734 /* If the address was rewritten to <> no verification can be done, and we have
1735 to return OK. This rewriting is permitted only for sender addresses; for other
1736 addresses, such rewriting fails. */
1738 if (!address
[0]) return OK
;
1740 /* Flip the legacy TLS-related variables over to the outbound set in case
1741 they're used in the context of a transport used by verification. Reset them
1742 at exit from this routine (so no returns allowed from here on). */
1744 tls_modify_variables(&tls_out
);
1746 /* Save a copy of the sender address for re-instating if we change it to <>
1747 while verifying a sender address (a nice bit of self-reference there). */
1749 save_sender
= sender_address
;
1751 /* Observability variable for router/transport use */
1753 verify_mode
= options
& vopt_is_recipient
? US
"R" : US
"S";
1755 /* Update the address structure with the possibly qualified and rewritten
1756 address. Set it up as the starting address on the chain of new addresses. */
1758 vaddr
->address
= address
;
1761 /* We need a loop, because an address can generate new addresses. We must also
1762 cope with generated pipes and files at the top level. (See also the code and
1763 comment in deliver.c.) However, it is usually the case that the router for
1764 user's .forward files has its verify flag turned off.
1766 If an address generates more than one child, the loop is used only when
1767 full_info is set, and this can only be set locally. Remote enquiries just get
1768 information about the top level address, not anything that it generated. */
1773 address_item
*addr
= addr_new
;
1775 addr_new
= addr
->next
;
1780 debug_printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
1781 debug_printf("Considering %s\n", addr
->address
);
1784 /* Handle generated pipe, file or reply addresses. We don't get these
1785 when handling EXPN, as it does only one level of expansion. */
1787 if (testflag(addr
, af_pfr
))
1794 if (addr
->address
[0] == '>')
1796 allow
= testflag(addr
, af_allow_reply
);
1797 fprintf(fp
, "%s -> mail %s", addr
->parent
->address
, addr
->address
+ 1);
1801 allow
= addr
->address
[0] == '|'
1802 ? testflag(addr
, af_allow_pipe
) : testflag(addr
, af_allow_file
);
1803 fprintf(fp
, "%s -> %s", addr
->parent
->address
, addr
->address
);
1806 if (addr
->basic_errno
== ERRNO_BADTRANSPORT
)
1807 fprintf(fp
, "\n*** Error in setting up pipe, file, or autoreply:\n"
1808 "%s\n", addr
->message
);
1810 fprintf(fp
, "\n transport = %s\n", addr
->transport
->name
);
1812 fprintf(fp
, " *** forbidden ***\n");
1817 /* Just in case some router parameter refers to it. */
1819 return_path
= addr
->prop
.errors_address
1820 ? addr
->prop
.errors_address
: sender_address
;
1822 /* Split the address into domain and local part, handling the %-hack if
1823 necessary, and then route it. While routing a sender address, set
1824 $sender_address to <> because that is what it will be if we were trying to
1825 send a bounce to the sender. */
1827 if (routed
) *routed
= FALSE
;
1828 if ((rc
= deliver_split_address(addr
)) == OK
)
1830 if (!(options
& vopt_is_recipient
)) sender_address
= null_sender
;
1831 rc
= route_address(addr
, &addr_local
, &addr_remote
, &addr_new
,
1832 &addr_succeed
, verify_type
);
1833 sender_address
= save_sender
; /* Put back the real sender */
1836 /* If routing an address succeeded, set the flag that remembers, for use when
1837 an ACL cached a sender verify (in case a callout fails). Then if routing set
1838 up a list of hosts or the transport has a host list, and the callout option
1839 is set, and we aren't in a host checking run, do the callout verification,
1840 and set another flag that notes that a callout happened. */
1844 if (routed
) *routed
= TRUE
;
1847 transport_instance
* tp
;
1848 host_item
* host_list
= addr
->host_list
;
1850 /* Make up some data for use in the case where there is no remote
1853 transport_feedback tf
= {
1854 .interface
= NULL
, /* interface (=> any) */
1856 .protocol
= US
"smtp",
1858 .helo_data
= US
"$smtp_active_hostname",
1859 .hosts_override
= FALSE
,
1860 .hosts_randomize
= FALSE
,
1861 .gethostbyname
= FALSE
,
1862 .qualify_single
= TRUE
,
1863 .search_parents
= FALSE
1866 /* If verification yielded a remote transport, we want to use that
1867 transport's options, so as to mimic what would happen if we were really
1868 sending a message to this address. */
1870 if ((tp
= addr
->transport
) && !tp
->info
->local
)
1872 (void)(tp
->setup
)(tp
, addr
, &tf
, 0, 0, NULL
);
1874 /* If the transport has hosts and the router does not, or if the
1875 transport is configured to override the router's hosts, we must build a
1876 host list of the transport's hosts, and find the IP addresses */
1878 if (tf
.hosts
&& (!host_list
|| tf
.hosts_override
))
1881 const uschar
*save_deliver_domain
= deliver_domain
;
1882 uschar
*save_deliver_localpart
= deliver_localpart
;
1884 host_list
= NULL
; /* Ignore the router's hosts */
1886 deliver_domain
= addr
->domain
;
1887 deliver_localpart
= addr
->local_part
;
1888 s
= expand_string(tf
.hosts
);
1889 deliver_domain
= save_deliver_domain
;
1890 deliver_localpart
= save_deliver_localpart
;
1894 log_write(0, LOG_MAIN
|LOG_PANIC
, "failed to expand list of hosts "
1895 "\"%s\" in %s transport for callout: %s", tf
.hosts
,
1896 tp
->name
, expand_string_message
);
1901 host_build_hostlist(&host_list
, s
, tf
.hosts_randomize
);
1903 /* Just ignore failures to find a host address. If we don't manage
1904 to find any addresses, the callout will defer. Note that more than
1905 one address may be found for a single host, which will result in
1906 additional host items being inserted into the chain. Hence we must
1907 save the next host first. */
1909 flags
= HOST_FIND_BY_A
| HOST_FIND_BY_AAAA
;
1910 if (tf
.qualify_single
) flags
|= HOST_FIND_QUALIFY_SINGLE
;
1911 if (tf
.search_parents
) flags
|= HOST_FIND_SEARCH_PARENTS
;
1913 for (host_item
* host
= host_list
, * nexthost
; host
; host
= nexthost
)
1915 nexthost
= host
->next
;
1916 if (tf
.gethostbyname
||
1917 string_is_ip_address(host
->name
, NULL
) != 0)
1918 (void)host_find_byname(host
, NULL
, flags
, NULL
, TRUE
);
1921 const dnssec_domains
* dsp
= NULL
;
1922 if (Ustrcmp(tp
->driver_name
, "smtp") == 0)
1924 smtp_transport_options_block
* ob
=
1925 (smtp_transport_options_block
*) tp
->options_block
;
1929 (void) host_find_bydns(host
, NULL
, flags
, NULL
, NULL
, NULL
,
1937 /* Can only do a callout if we have at least one host! If the callout
1938 fails, it will have set ${sender,recipient}_verify_failure. */
1942 HDEBUG(D_verify
) debug_printf("Attempting full verification using callout\n");
1943 if (host_checking
&& !f
.host_checking_callout
)
1946 debug_printf("... callout omitted by default when host testing\n"
1947 "(Use -bhc if you want the callouts to happen.)\n");
1952 deliver_set_expansions(addr
);
1954 rc
= do_callout(addr
, host_list
, &tf
, callout
, callout_overall
,
1955 callout_connect
, options
, se_mailfrom
, pm_mailfrom
);
1957 deliver_set_expansions(NULL
);
1963 HDEBUG(D_verify
) debug_printf("Cannot do callout: neither router nor "
1964 "transport provided a host list, or transport is not smtp\n");
1969 /* Otherwise, any failure is a routing failure */
1971 else *failure_ptr
= US
"route";
1973 /* A router may return REROUTED if it has set up a child address as a result
1974 of a change of domain name (typically from widening). In this case we always
1975 want to continue to verify the new child. */
1977 if (rc
== REROUTED
) continue;
1979 /* Handle hard failures */
1986 address_item
*p
= addr
->parent
;
1988 respond_printf(fp
, "%s%s %s", ko_prefix
,
1989 full_info
? addr
->address
: address
,
1990 f
.address_test_mode
? "is undeliverable" : "failed to verify");
1991 if (!expn
&& f
.admin_user
)
1993 if (addr
->basic_errno
> 0)
1994 respond_printf(fp
, ": %s", strerror(addr
->basic_errno
));
1996 respond_printf(fp
, ": %s", addr
->message
);
1999 /* Show parents iff doing full info */
2001 if (full_info
) while (p
)
2003 respond_printf(fp
, "%s\n <-- %s", cr
, p
->address
);
2006 respond_printf(fp
, "%s\n", cr
);
2008 cancel_cutthrough_connection(TRUE
, US
"routing hard fail");
2012 yield
= copy_error(vaddr
, addr
, FAIL
);
2020 else if (rc
== DEFER
)
2025 address_item
*p
= addr
->parent
;
2026 respond_printf(fp
, "%s%s cannot be resolved at this time", ko_prefix
,
2027 full_info
? addr
->address
: address
);
2028 if (!expn
&& f
.admin_user
)
2030 if (addr
->basic_errno
> 0)
2031 respond_printf(fp
, ": %s", strerror(addr
->basic_errno
));
2033 respond_printf(fp
, ": %s", addr
->message
);
2034 else if (addr
->basic_errno
<= 0)
2035 respond_printf(fp
, ": unknown error");
2038 /* Show parents iff doing full info */
2040 if (full_info
) while (p
)
2042 respond_printf(fp
, "%s\n <-- %s", cr
, p
->address
);
2045 respond_printf(fp
, "%s\n", cr
);
2047 cancel_cutthrough_connection(TRUE
, US
"routing soft fail");
2051 yield
= copy_error(vaddr
, addr
, DEFER
);
2054 if (yield
== OK
) yield
= DEFER
;
2057 /* If we are handling EXPN, we do not want to continue to route beyond
2058 the top level (whose address is in "address"). */
2062 uschar
*ok_prefix
= US
"250-";
2065 if (!addr_local
&& !addr_remote
)
2066 respond_printf(fp
, "250 mail to <%s> is discarded\r\n", address
);
2068 respond_printf(fp
, "250 <%s>\r\n", address
);
2072 address_item
*addr2
= addr_new
;
2073 addr_new
= addr2
->next
;
2074 if (!addr_new
) ok_prefix
= US
"250 ";
2075 respond_printf(fp
, "%s<%s>\r\n", ok_prefix
, addr2
->address
);
2081 /* Successful routing other than EXPN. */
2085 /* Handle successful routing when short info wanted. Otherwise continue for
2086 other (generated) addresses. Short info is the operational case. Full info
2087 can be requested only when debug_selector != 0 and a file is supplied.
2089 There is a conflict between the use of aliasing as an alternate email
2090 address, and as a sort of mailing list. If an alias turns the incoming
2091 address into just one address (e.g. J.Caesar->jc44) you may well want to
2092 carry on verifying the generated address to ensure it is valid when
2093 checking incoming mail. If aliasing generates multiple addresses, you
2094 probably don't want to do this. Exim therefore treats the generation of
2095 just a single new address as a special case, and continues on to verify the
2096 generated address. */
2098 if ( !full_info
/* Stop if short info wanted AND */
2099 && ( ( !addr_new
/* No new address OR */
2100 || addr_new
->next
/* More than one new address OR */
2101 || testflag(addr_new
, af_pfr
) /* New address is pfr */
2104 ( addr_new
/* At least one new address AND */
2105 && success_on_redirect
/* success_on_redirect is set */
2109 if (fp
) fprintf(fp
, "%s %s\n",
2110 address
, f
.address_test_mode
? "is deliverable" : "verified");
2112 /* If we have carried on to verify a child address, we want the value
2113 of $address_data to be that of the child */
2115 vaddr
->prop
.address_data
= addr
->prop
.address_data
;
2116 vaddr
->prop
.variables
= NULL
;
2117 tree_dup((tree_node
**)&vaddr
->prop
.variables
, addr
->prop
.variables
);
2119 /* If stopped because more than one new address, cannot cutthrough */
2121 if (addr_new
&& addr_new
->next
)
2122 cancel_cutthrough_connection(TRUE
, US
"multiple addresses from routing");
2128 } /* Loop for generated addresses */
2130 /* Display the full results of the successful routing, including any generated
2131 addresses. Control gets here only when full_info is set, which requires fp not
2132 to be NULL, and this occurs only when a top-level verify is called with the
2133 debugging switch on.
2135 If there are no local and no remote addresses, and there were no pipes, files,
2136 or autoreplies, and there were no errors or deferments, the message is to be
2137 discarded, usually because of the use of :blackhole: in an alias file. */
2139 if (allok
&& !addr_local
&& !addr_remote
)
2141 fprintf(fp
, "mail to %s is discarded\n", address
);
2145 for (addr_list
= addr_local
, i
= 0; i
< 2; addr_list
= addr_remote
, i
++)
2148 address_item
*addr
= addr_list
;
2149 transport_instance
* tp
= addr
->transport
;
2151 addr_list
= addr
->next
;
2153 fprintf(fp
, "%s", CS addr
->address
);
2154 #ifdef EXPERIMENTAL_SRS
2155 if(addr
->prop
.srs_sender
)
2156 fprintf(fp
, " [srs = %s]", addr
->prop
.srs_sender
);
2159 /* If the address is a duplicate, show something about it. */
2161 if (!testflag(addr
, af_pfr
))
2164 if ((tnode
= tree_search(tree_duplicates
, addr
->unique
)))
2165 fprintf(fp
, " [duplicate, would not be delivered]");
2166 else tree_add_duplicate(addr
->unique
, addr
);
2169 /* Now show its parents */
2171 for (address_item
* p
= addr
->parent
; p
; p
= p
->parent
)
2172 fprintf(fp
, "\n <-- %s", p
->address
);
2175 /* Show router, and transport */
2177 fprintf(fp
, "router = %s, transport = %s\n",
2178 addr
->router
->name
, tp
? tp
->name
: US
"unset");
2180 /* Show any hosts that are set up by a router unless the transport
2181 is going to override them; fiddle a bit to get a nice format. */
2183 if (addr
->host_list
&& tp
&& !tp
->overrides_hosts
)
2187 for (host_item
* h
= addr
->host_list
; h
; h
= h
->next
)
2188 { /* get max lengths of host names, addrs */
2189 int len
= Ustrlen(h
->name
);
2190 if (len
> maxlen
) maxlen
= len
;
2191 len
= h
->address
? Ustrlen(h
->address
) : 7;
2192 if (len
> maxaddlen
) maxaddlen
= len
;
2194 for (host_item
* h
= addr
->host_list
; h
; h
= h
->next
)
2196 fprintf(fp
, " host %-*s ", maxlen
, h
->name
);
2199 fprintf(fp
, "[%s%-*c", h
->address
, maxaddlen
+1 - Ustrlen(h
->address
), ']');
2200 else if (tp
->info
->local
)
2201 fprintf(fp
, " %-*s ", maxaddlen
, ""); /* Omit [unknown] for local */
2203 fprintf(fp
, "[%s%-*c", "unknown", maxaddlen
+1 - 7, ']');
2205 if (h
->mx
>= 0) fprintf(fp
, " MX=%d", h
->mx
);
2206 if (h
->port
!= PORT_NONE
) fprintf(fp
, " port=%d", h
->port
);
2207 if (f
.running_in_test_harness
&& h
->dnssec
== DS_YES
) fputs(" AD", fp
);
2208 if (h
->status
== hstatus_unusable
) fputs(" ** unusable **", fp
);
2214 /* Yield will be DEFER or FAIL if any one address has, only for full_info (which is
2215 the -bv or -bt case). */
2219 tls_modify_variables(&tls_in
); /* return variables to inbound values */
2227 /*************************************************
2228 * Check headers for syntax errors *
2229 *************************************************/
2231 /* This function checks those header lines that contain addresses, and verifies
2232 that all the addresses therein are 5322-syntactially correct.
2235 msgptr where to put an error message
2242 verify_check_headers(uschar
**msgptr
)
2247 for (header_line
* h
= header_list
; h
&& yield
== OK
; h
= h
->next
)
2249 if (h
->type
!= htype_from
&&
2250 h
->type
!= htype_reply_to
&&
2251 h
->type
!= htype_sender
&&
2252 h
->type
!= htype_to
&&
2253 h
->type
!= htype_cc
&&
2254 h
->type
!= htype_bcc
)
2257 colon
= Ustrchr(h
->text
, ':');
2259 while (isspace(*s
)) s
++;
2261 /* Loop for multiple addresses in the header, enabling group syntax. Note
2262 that we have to reset this after the header has been scanned. */
2264 f
.parse_allow_group
= TRUE
;
2268 uschar
*ss
= parse_find_address_end(s
, FALSE
);
2269 uschar
*recipient
, *errmess
;
2270 int terminator
= *ss
;
2271 int start
, end
, domain
;
2273 /* Temporarily terminate the string at this point, and extract the
2274 operative address within, allowing group syntax. */
2277 recipient
= parse_extract_address(s
,&errmess
,&start
,&end
,&domain
,FALSE
);
2280 /* Permit an unqualified address only if the message is local, or if the
2281 sending host is configured to be permitted to send them. */
2283 if (recipient
&& !domain
)
2285 if (h
->type
== htype_from
|| h
->type
== htype_sender
)
2287 if (!f
.allow_unqualified_sender
) recipient
= NULL
;
2291 if (!f
.allow_unqualified_recipient
) recipient
= NULL
;
2293 if (recipient
== NULL
) errmess
= US
"unqualified address not permitted";
2296 /* It's an error if no address could be extracted, except for the special
2297 case of an empty address. */
2299 if (!recipient
&& Ustrcmp(errmess
, "empty address") != 0)
2301 uschar
*verb
= US
"is";
2306 /* Arrange not to include any white space at the end in the
2307 error message or the header name. */
2309 while (t
> s
&& isspace(t
[-1])) t
--;
2310 while (tt
> h
->text
&& isspace(tt
[-1])) tt
--;
2312 /* Add the address that failed to the error message, since in a
2313 header with very many addresses it is sometimes hard to spot
2314 which one is at fault. However, limit the amount of address to
2315 quote - cases have been seen where, for example, a missing double
2316 quote in a humungous To: header creates an "address" that is longer
2317 than string_sprintf can handle. */
2326 /* deconst cast ok as we're passing a non-const to string_printing() */
2327 *msgptr
= US
string_printing(
2328 string_sprintf("%s: failing address in \"%.*s:\" header %s: %.*s",
2329 errmess
, (int)(tt
- h
->text
), h
->text
, verb
, len
, s
));
2332 break; /* Out of address loop */
2335 /* Advance to the next address */
2337 s
= ss
+ (terminator
? 1 : 0);
2338 while (isspace(*s
)) s
++;
2339 } /* Next address */
2341 f
.parse_allow_group
= FALSE
;
2342 f
.parse_found_group
= FALSE
;
2343 } /* Next header unless yield has been set FALSE */
2349 /*************************************************
2350 * Check header names for 8-bit characters *
2351 *************************************************/
2353 /* This function checks for invalid characters in header names. See
2354 RFC 5322, 2.2. and RFC 6532, 3.
2357 msgptr where to put an error message
2364 verify_check_header_names_ascii(uschar
**msgptr
)
2368 for (header_line
* h
= header_list
; h
; h
= h
->next
)
2370 colon
= Ustrchr(h
->text
, ':');
2371 for(uschar
* s
= h
->text
; s
< colon
; s
++)
2372 if ((*s
< 33) || (*s
> 126))
2374 *msgptr
= string_sprintf("Invalid character in header \"%.*s\" found",
2375 (int)(colon
- h
->text
), h
->text
);
2382 /*************************************************
2383 * Check for blind recipients *
2384 *************************************************/
2386 /* This function checks that every (envelope) recipient is mentioned in either
2387 the To: or Cc: header lines, thus detecting blind carbon copies.
2389 There are two ways of scanning that could be used: either scan the header lines
2390 and tick off the recipients, or scan the recipients and check the header lines.
2391 The original proposed patch did the former, but I have chosen to do the latter,
2392 because (a) it requires no memory and (b) will use fewer resources when there
2393 are many addresses in To: and/or Cc: and only one or two envelope recipients.
2395 Arguments: case_sensitive true if case sensitive matching should be used
2396 Returns: OK if there are no blind recipients
2397 FAIL if there is at least one blind recipient
2401 verify_check_notblind(BOOL case_sensitive
)
2403 for (int i
= 0; i
< recipients_count
; i
++)
2406 uschar
*address
= recipients_list
[i
].address
;
2408 for (header_line
* h
= header_list
; !found
&& h
; h
= h
->next
)
2412 if (h
->type
!= htype_to
&& h
->type
!= htype_cc
) continue;
2414 colon
= Ustrchr(h
->text
, ':');
2416 while (isspace(*s
)) s
++;
2418 /* Loop for multiple addresses in the header, enabling group syntax. Note
2419 that we have to reset this after the header has been scanned. */
2421 f
.parse_allow_group
= TRUE
;
2425 uschar
* ss
= parse_find_address_end(s
, FALSE
);
2426 uschar
* recipient
, * errmess
;
2427 int terminator
= *ss
;
2428 int start
, end
, domain
;
2430 /* Temporarily terminate the string at this point, and extract the
2431 operative address within, allowing group syntax. */
2434 recipient
= parse_extract_address(s
,&errmess
,&start
,&end
,&domain
,FALSE
);
2437 /* If we found a valid recipient that has a domain, compare it with the
2438 envelope recipient. Local parts are compared with case-sensitivity
2439 according to the routine arg, domains case-insensitively.
2440 By comparing from the start with length "domain", we include the "@" at
2441 the end, which ensures that we are comparing the whole local part of each
2444 if (recipient
&& domain
!= 0)
2445 if ((found
= (case_sensitive
2446 ? Ustrncmp(recipient
, address
, domain
) == 0
2447 : strncmpic(recipient
, address
, domain
) == 0)
2448 && strcmpic(recipient
+ domain
, address
+ domain
) == 0))
2451 /* Advance to the next address */
2453 s
= ss
+ (terminator
? 1:0);
2454 while (isspace(*s
)) s
++;
2455 } /* Next address */
2457 f
.parse_allow_group
= FALSE
;
2458 f
.parse_found_group
= FALSE
;
2459 } /* Next header (if found is false) */
2461 if (!found
) return FAIL
;
2462 } /* Next recipient */
2469 /*************************************************
2470 * Find if verified sender *
2471 *************************************************/
2473 /* Usually, just a single address is verified as the sender of the message.
2474 However, Exim can be made to verify other addresses as well (often related in
2475 some way), and this is useful in some environments. There may therefore be a
2476 chain of such addresses that have previously been tested. This function finds
2477 whether a given address is on the chain.
2479 Arguments: the address to be verified
2480 Returns: pointer to an address item, or NULL
2484 verify_checked_sender(uschar
*sender
)
2486 for (address_item
* addr
= sender_verified_list
; addr
; addr
= addr
->next
)
2487 if (Ustrcmp(sender
, addr
->address
) == 0) return addr
;
2495 /*************************************************
2496 * Get valid header address *
2497 *************************************************/
2499 /* Scan the originator headers of the message, looking for an address that
2500 verifies successfully. RFC 822 says:
2502 o The "Sender" field mailbox should be sent notices of
2503 any problems in transport or delivery of the original
2504 messages. If there is no "Sender" field, then the
2505 "From" field mailbox should be used.
2507 o If the "Reply-To" field exists, then the reply should
2508 go to the addresses indicated in that field and not to
2509 the address(es) indicated in the "From" field.
2511 So we check a Sender field if there is one, else a Reply_to field, else a From
2512 field. As some strange messages may have more than one of these fields,
2513 especially if they are resent- fields, check all of them if there is more than
2517 user_msgptr points to where to put a user error message
2518 log_msgptr points to where to put a log error message
2519 callout timeout for callout check (passed to verify_address())
2520 callout_overall overall callout timeout (ditto)
2521 callout_connect connect callout timeout (ditto)
2522 se_mailfrom mailfrom for verify; NULL => ""
2523 pm_mailfrom sender for pm callout check (passed to verify_address())
2524 options callout options (passed to verify_address())
2525 verrno where to put the address basic_errno
2527 If log_msgptr is set to something without setting user_msgptr, the caller
2528 normally uses log_msgptr for both things.
2530 Returns: result of the verification attempt: OK, FAIL, or DEFER;
2531 FAIL is given if no appropriate headers are found
2535 verify_check_header_address(uschar
**user_msgptr
, uschar
**log_msgptr
,
2536 int callout
, int callout_overall
, int callout_connect
, uschar
*se_mailfrom
,
2537 uschar
*pm_mailfrom
, int options
, int *verrno
)
2539 static int header_types
[] = { htype_sender
, htype_reply_to
, htype_from
};
2543 for (int i
= 0; i
< 3 && !done
; i
++)
2544 for (header_line
* h
= header_list
; h
!= NULL
&& !done
; h
= h
->next
)
2546 int terminator
, new_ok
;
2547 uschar
*s
, *ss
, *endname
;
2549 if (h
->type
!= header_types
[i
]) continue;
2550 s
= endname
= Ustrchr(h
->text
, ':') + 1;
2552 /* Scan the addresses in the header, enabling group syntax. Note that we
2553 have to reset this after the header has been scanned. */
2555 f
.parse_allow_group
= TRUE
;
2559 address_item
*vaddr
;
2561 while (isspace(*s
) || *s
== ',') s
++;
2562 if (*s
== 0) break; /* End of header */
2564 ss
= parse_find_address_end(s
, FALSE
);
2566 /* The terminator is a comma or end of header, but there may be white
2567 space preceding it (including newline for the last address). Move back
2568 past any white space so we can check against any cached envelope sender
2569 address verifications. */
2571 while (isspace(ss
[-1])) ss
--;
2575 HDEBUG(D_verify
) debug_printf("verifying %.*s header address %s\n",
2576 (int)(endname
- h
->text
), h
->text
, s
);
2578 /* See if we have already verified this address as an envelope sender,
2579 and if so, use the previous answer. */
2581 vaddr
= verify_checked_sender(s
);
2583 if (vaddr
!= NULL
&& /* Previously checked */
2584 (callout
<= 0 || /* No callout needed; OR */
2585 vaddr
->special_action
> 256)) /* Callout was done */
2587 new_ok
= vaddr
->special_action
& 255;
2588 HDEBUG(D_verify
) debug_printf("previously checked as envelope sender\n");
2589 *ss
= terminator
; /* Restore shortened string */
2592 /* Otherwise we run the verification now. We must restore the shortened
2593 string before running the verification, so the headers are correct, in
2594 case there is any rewriting. */
2598 int start
, end
, domain
;
2599 uschar
*address
= parse_extract_address(s
, log_msgptr
, &start
, &end
,
2604 /* If we found an empty address, just carry on with the next one, but
2605 kill the message. */
2607 if (address
== NULL
&& Ustrcmp(*log_msgptr
, "empty address") == 0)
2614 /* If verification failed because of a syntax error, fail this
2615 function, and ensure that the failing address gets added to the error
2618 if (address
== NULL
)
2621 while (ss
> s
&& isspace(ss
[-1])) ss
--;
2622 *log_msgptr
= string_sprintf("syntax error in '%.*s' header when "
2623 "scanning for sender: %s in \"%.*s\"",
2624 (int)(endname
- h
->text
), h
->text
, *log_msgptr
, (int)(ss
- s
), s
);
2630 /* Else go ahead with the sender verification. But it isn't *the*
2631 sender of the message, so set vopt_fake_sender to stop sender_address
2632 being replaced after rewriting or qualification. */
2636 vaddr
= deliver_make_addr(address
, FALSE
);
2637 new_ok
= verify_address(vaddr
, NULL
, options
| vopt_fake_sender
,
2638 callout
, callout_overall
, callout_connect
, se_mailfrom
,
2643 /* We now have the result, either newly found, or cached. If we are
2644 giving out error details, set a specific user error. This means that the
2645 last of these will be returned to the user if all three fail. We do not
2646 set a log message - the generic one below will be used. */
2650 *verrno
= vaddr
->basic_errno
;
2651 if (smtp_return_error_details
)
2652 *user_msgptr
= string_sprintf("Rejected after DATA: "
2653 "could not verify \"%.*s\" header address\n%s: %s",
2654 (int)(endname
- h
->text
), h
->text
, vaddr
->address
, vaddr
->message
);
2657 /* Success or defer */
2666 if (new_ok
== DEFER
) yield
= DEFER
;
2668 /* Move on to any more addresses in the header */
2671 } /* Next address */
2673 f
.parse_allow_group
= FALSE
;
2674 f
.parse_found_group
= FALSE
;
2675 } /* Next header, unless done */
2676 /* Next header type unless done */
2678 if (yield
== FAIL
&& *log_msgptr
== NULL
)
2679 *log_msgptr
= US
"there is no valid sender in any header line";
2681 if (yield
== DEFER
&& *log_msgptr
== NULL
)
2682 *log_msgptr
= US
"all attempts to verify a sender in a header line deferred";
2690 /*************************************************
2691 * Get RFC 1413 identification *
2692 *************************************************/
2694 /* Attempt to get an id from the sending machine via the RFC 1413 protocol. If
2695 the timeout is set to zero, then the query is not done. There may also be lists
2696 of hosts and nets which are exempt. To guard against malefactors sending
2697 non-printing characters which could, for example, disrupt a message's headers,
2698 make sure the string consists of printing characters only.
2701 port the port to connect to; usually this is IDENT_PORT (113), but when
2702 running in the test harness with -bh a different value is used.
2706 Side effect: any received ident value is put in sender_ident (NULL otherwise)
2710 verify_get_ident(int port
)
2712 client_conn_ctx ident_conn_ctx
= {0};
2714 int received_sender_port
, received_interface_port
, n
;
2717 uschar buffer
[2048];
2719 /* Default is no ident. Check whether we want to do an ident check for this
2722 sender_ident
= NULL
;
2723 if (rfc1413_query_timeout
<= 0 || verify_check_host(&rfc1413_hosts
) != OK
)
2726 DEBUG(D_ident
) debug_printf("doing ident callback\n");
2728 /* Set up a connection to the ident port of the remote host. Bind the local end
2729 to the incoming interface address. If the sender host address is an IPv6
2730 address, the incoming interface address will also be IPv6. */
2732 host_af
= Ustrchr(sender_host_address
, ':') == NULL
? AF_INET
: AF_INET6
;
2733 if ((ident_conn_ctx
.sock
= ip_socket(SOCK_STREAM
, host_af
)) < 0) return;
2735 if (ip_bind(ident_conn_ctx
.sock
, host_af
, interface_address
, 0) < 0)
2737 DEBUG(D_ident
) debug_printf("bind socket for ident failed: %s\n",
2742 /* Construct and send the query. */
2744 qlen
= snprintf(CS buffer
, sizeof(buffer
), "%d , %d\r\n",
2745 sender_host_port
, interface_port
);
2746 early_data
.data
= buffer
;
2747 early_data
.len
= qlen
;
2749 /*XXX we trust that the query is idempotent */
2750 if (ip_connect(ident_conn_ctx
.sock
, host_af
, sender_host_address
, port
,
2751 rfc1413_query_timeout
, &early_data
) < 0)
2753 if (errno
== ETIMEDOUT
&& LOGGING(ident_timeout
))
2754 log_write(0, LOG_MAIN
, "ident connection to %s timed out",
2755 sender_host_address
);
2757 DEBUG(D_ident
) debug_printf("ident connection to %s failed: %s\n",
2758 sender_host_address
, strerror(errno
));
2762 /* Read a response line. We put it into the rest of the buffer, using several
2763 recv() calls if necessary. */
2771 int size
= sizeof(buffer
) - (p
- buffer
);
2773 if (size
<= 0) goto END_OFF
; /* Buffer filled without seeing \n. */
2774 count
= ip_recv(&ident_conn_ctx
, p
, size
, time(NULL
) + rfc1413_query_timeout
);
2775 if (count
<= 0) goto END_OFF
; /* Read error or EOF */
2777 /* Scan what we just read, to see if we have reached the terminating \r\n. Be
2778 generous, and accept a plain \n terminator as well. The only illegal
2781 for (pp
= p
; pp
< p
+ count
; pp
++)
2783 if (*pp
== 0) goto END_OFF
; /* Zero octet not allowed */
2786 if (pp
[-1] == '\r') pp
--;
2788 goto GOT_DATA
; /* Break out of both loops */
2792 /* Reached the end of the data without finding \n. Let the loop continue to
2793 read some more, if there is room. */
2800 /* We have received a line of data. Check it carefully. It must start with the
2801 same two port numbers that we sent, followed by data as defined by the RFC. For
2804 12345 , 25 : USERID : UNIX :root
2806 However, the amount of white space may be different to what we sent. In the
2807 "osname" field there may be several sub-fields, comma separated. The data we
2808 actually want to save follows the third colon. Some systems put leading spaces
2809 in it - we discard those. */
2811 if (sscanf(CS buffer
+ qlen
, "%d , %d%n", &received_sender_port
,
2812 &received_interface_port
, &n
) != 2 ||
2813 received_sender_port
!= sender_host_port
||
2814 received_interface_port
!= interface_port
)
2817 p
= buffer
+ qlen
+ n
;
2818 while(isspace(*p
)) p
++;
2819 if (*p
++ != ':') goto END_OFF
;
2820 while(isspace(*p
)) p
++;
2821 if (Ustrncmp(p
, "USERID", 6) != 0) goto END_OFF
;
2823 while(isspace(*p
)) p
++;
2824 if (*p
++ != ':') goto END_OFF
;
2825 while (*p
!= 0 && *p
!= ':') p
++;
2826 if (*p
++ == 0) goto END_OFF
;
2827 while(isspace(*p
)) p
++;
2828 if (*p
== 0) goto END_OFF
;
2830 /* The rest of the line is the data we want. We turn it into printing
2831 characters when we save it, so that it cannot mess up the format of any logging
2832 or Received: lines into which it gets inserted. We keep a maximum of 127
2833 characters. The deconst cast is ok as we fed a nonconst to string_printing() */
2835 sender_ident
= US
string_printing(string_copyn(p
, 127));
2836 DEBUG(D_ident
) debug_printf("sender_ident = %s\n", sender_ident
);
2839 (void)close(ident_conn_ctx
.sock
);
2846 /*************************************************
2847 * Match host to a single host-list item *
2848 *************************************************/
2850 /* This function compares a host (name or address) against a single item
2851 from a host list. The host name gets looked up if it is needed and is not
2852 already known. The function is called from verify_check_this_host() via
2853 match_check_list(), which is why most of its arguments are in a single block.
2856 arg the argument block (see below)
2857 ss the host-list item
2858 valueptr where to pass back looked up data, or NULL
2859 error for error message when returning ERROR
2862 host_name (a) the host name, or
2863 (b) NULL, implying use sender_host_name and
2864 sender_host_aliases, looking them up if required, or
2865 (c) the empty string, meaning that only IP address matches
2867 host_address the host address
2868 host_ipv4 the IPv4 address taken from an IPv6 one
2872 DEFER lookup deferred
2873 ERROR (a) failed to find the host name or IP address, or
2874 (b) unknown lookup type specified, or
2875 (c) host name encountered when only IP addresses are
2880 check_host(void *arg
, const uschar
*ss
, const uschar
**valueptr
, uschar
**error
)
2882 check_host_block
*cb
= (check_host_block
*)arg
;
2885 BOOL iplookup
= FALSE
;
2886 BOOL isquery
= FALSE
;
2887 BOOL isiponly
= cb
->host_name
!= NULL
&& cb
->host_name
[0] == 0;
2892 /* Optimize for the special case when the pattern is "*". */
2894 if (*ss
== '*' && ss
[1] == 0) return OK
;
2896 /* If the pattern is empty, it matches only in the case when there is no host -
2897 this can occur in ACL checking for SMTP input using the -bs option. In this
2898 situation, the host address is the empty string. */
2900 if (cb
->host_address
[0] == 0) return (*ss
== 0)? OK
: FAIL
;
2901 if (*ss
== 0) return FAIL
;
2903 /* If the pattern is precisely "@" then match against the primary host name,
2904 provided that host name matching is permitted; if it's "@[]" match against the
2905 local host's IP addresses. */
2911 if (isiponly
) return ERROR
;
2912 ss
= primary_hostname
;
2914 else if (Ustrcmp(ss
, "@[]") == 0)
2916 for (ip_address_item
* ip
= host_find_interfaces(); ip
; ip
= ip
->next
)
2917 if (Ustrcmp(ip
->address
, cb
->host_address
) == 0) return OK
;
2922 /* If the pattern is an IP address, optionally followed by a bitmask count, do
2923 a (possibly masked) comparison with the current IP address. */
2925 if (string_is_ip_address(ss
, &maskoffset
) != 0)
2926 return (host_is_in_net(cb
->host_address
, ss
, maskoffset
)? OK
: FAIL
);
2928 /* The pattern is not an IP address. A common error that people make is to omit
2929 one component of an IPv4 address, either by accident, or believing that, for
2930 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,
2931 which it isn't. (Those applications that do accept 1.2.3 as an IP address
2932 interpret it as 1.2.0.3 because the final component becomes 16-bit - this is an
2933 ancient specification.) To aid in debugging these cases, we give a specific
2934 error if the pattern contains only digits and dots or contains a slash preceded
2935 only by digits and dots (a slash at the start indicates a file name and of
2936 course slashes may be present in lookups, but not preceded only by digits and
2939 for (t
= ss
; isdigit(*t
) || *t
== '.'; ) t
++;
2940 if (*t
== 0 || (*t
== '/' && t
!= ss
))
2942 *error
= US
"malformed IPv4 address or address mask";
2946 /* See if there is a semicolon in the pattern */
2948 semicolon
= Ustrchr(ss
, ';');
2950 /* If we are doing an IP address only match, then all lookups must be IP
2951 address lookups, even if there is no "net-". */
2955 iplookup
= semicolon
!= NULL
;
2958 /* Otherwise, if the item is of the form net[n]-lookup;<file|query> then it is
2959 a lookup on a masked IP network, in textual form. We obey this code even if we
2960 have already set iplookup, so as to skip over the "net-" prefix and to set the
2961 mask length. The net- stuff really only applies to single-key lookups where the
2962 key is implicit. For query-style lookups the key is specified in the query.
2963 From release 4.30, the use of net- for query style is no longer needed, but we
2964 retain it for backward compatibility. */
2966 if (Ustrncmp(ss
, "net", 3) == 0 && semicolon
!= NULL
)
2969 for (t
= ss
+ 3; isdigit(*t
); t
++) mlen
= mlen
* 10 + *t
- '0';
2970 if (mlen
== 0 && t
== ss
+3) mlen
= -1; /* No mask supplied */
2971 iplookup
= (*t
++ == '-');
2976 /* Do the IP address lookup if that is indeed what we have */
2984 uschar
*filename
, *key
, *result
;
2987 /* Find the search type */
2989 search_type
= search_findtype(t
, semicolon
- t
);
2991 if (search_type
< 0) log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "%s",
2992 search_error_message
);
2994 /* Adjust parameters for the type of lookup. For a query-style lookup, there
2995 is no file name, and the "key" is just the query. For query-style with a file
2996 name, we have to fish the file off the start of the query. For a single-key
2997 lookup, the key is the current IP address, masked appropriately, and
2998 reconverted to text form, with the mask appended. For IPv6 addresses, specify
2999 dot separators instead of colons, except when the lookup type is "iplsearch".
3002 if (mac_islookup(search_type
, lookup_absfilequery
))
3004 filename
= semicolon
+ 1;
3006 while (*key
!= 0 && !isspace(*key
)) key
++;
3007 filename
= string_copyn(filename
, key
- filename
);
3008 while (isspace(*key
)) key
++;
3010 else if (mac_islookup(search_type
, lookup_querystyle
))
3013 key
= semicolon
+ 1;
3015 else /* Single-key style */
3017 int sep
= (Ustrcmp(lookup_list
[search_type
]->name
, "iplsearch") == 0)?
3019 insize
= host_aton(cb
->host_address
, incoming
);
3020 host_mask(insize
, incoming
, mlen
);
3021 (void)host_nmtoa(insize
, incoming
, mlen
, buffer
, sep
);
3023 filename
= semicolon
+ 1;
3026 /* Now do the actual lookup; note that there is no search_close() because
3027 of the caching arrangements. */
3029 if (!(handle
= search_open(filename
, search_type
, 0, NULL
, NULL
)))
3030 log_write(0, LOG_MAIN
|LOG_PANIC_DIE
, "%s", search_error_message
);
3032 result
= search_find(handle
, filename
, key
, -1, NULL
, 0, 0, NULL
);
3033 if (valueptr
) *valueptr
= result
;
3034 return result
? OK
: f
.search_find_defer
? DEFER
: FAIL
;
3037 /* The pattern is not an IP address or network reference of any kind. That is,
3038 it is a host name pattern. If this is an IP only match, there's an error in the
3043 *error
= US
"cannot match host name in match_ip list";
3047 /* Check the characters of the pattern to see if they comprise only letters,
3048 digits, full stops, and hyphens (the constituents of domain names). Allow
3049 underscores, as they are all too commonly found. Sigh. Also, if
3050 allow_utf8_domains is set, allow top-bit characters. */
3052 for (t
= ss
; *t
!= 0; t
++)
3053 if (!isalnum(*t
) && *t
!= '.' && *t
!= '-' && *t
!= '_' &&
3054 (!allow_utf8_domains
|| *t
< 128)) break;
3056 /* If the pattern is a complete domain name, with no fancy characters, look up
3057 its IP address and match against that. Note that a multi-homed host will add
3058 items to the chain. */
3069 /* Using byname rather than bydns here means we cannot determine dnssec
3070 status. On the other hand it is unclear how that could be either
3071 propagated up or enforced. */
3073 rc
= host_find_byname(&h
, NULL
, HOST_FIND_QUALIFY_SINGLE
, NULL
, FALSE
);
3074 if (rc
== HOST_FOUND
|| rc
== HOST_FOUND_LOCAL
)
3076 for (host_item
* hh
= &h
; hh
; hh
= hh
->next
)
3077 if (host_is_in_net(hh
->address
, cb
->host_address
, 0)) return OK
;
3080 if (rc
== HOST_FIND_AGAIN
) return DEFER
;
3081 *error
= string_sprintf("failed to find IP address for %s", ss
);
3085 /* Almost all subsequent comparisons require the host name, and can be done
3086 using the general string matching function. When this function is called for
3087 outgoing hosts, the name is always given explicitly. If it is NULL, it means we
3088 must use sender_host_name and its aliases, looking them up if necessary. */
3090 if (cb
->host_name
!= NULL
) /* Explicit host name given */
3091 return match_check_string(cb
->host_name
, ss
, -1, TRUE
, TRUE
, TRUE
,
3094 /* Host name not given; in principle we need the sender host name and its
3095 aliases. However, for query-style lookups, we do not need the name if the
3096 query does not contain $sender_host_name. From release 4.23, a reference to
3097 $sender_host_name causes it to be looked up, so we don't need to do the lookup
3100 if ((semicolon
= Ustrchr(ss
, ';')) != NULL
)
3102 const uschar
*affix
;
3103 int partial
, affixlen
, starflags
, id
;
3106 id
= search_findtype_partial(ss
, &partial
, &affix
, &affixlen
, &starflags
);
3109 if (id
< 0) /* Unknown lookup type */
3111 log_write(0, LOG_MAIN
|LOG_PANIC
, "%s in host list item \"%s\"",
3112 search_error_message
, ss
);
3115 isquery
= mac_islookup(id
, lookup_querystyle
|lookup_absfilequery
);
3120 switch(match_check_string(US
"", ss
, -1, TRUE
, TRUE
, TRUE
, valueptr
))
3123 case DEFER
: return DEFER
;
3124 default: return FAIL
;
3128 /* Not a query-style lookup; must ensure the host name is present, and then we
3129 do a check on the name and all its aliases. */
3131 if (!sender_host_name
)
3133 HDEBUG(D_host_lookup
)
3134 debug_printf("sender host name required, to match against %s\n", ss
);
3135 if (host_lookup_failed
|| host_name_lookup() != OK
)
3137 *error
= string_sprintf("failed to find host name for %s",
3138 sender_host_address
);;
3141 host_build_sender_fullhost();
3144 /* Match on the sender host name, using the general matching function */
3146 switch(match_check_string(sender_host_name
, ss
, -1, TRUE
, TRUE
, TRUE
, valueptr
))
3149 case DEFER
: return DEFER
;
3152 /* If there are aliases, try matching on them. */
3154 aliases
= sender_host_aliases
;
3156 switch(match_check_string(*aliases
++, ss
, -1, TRUE
, TRUE
, TRUE
, valueptr
))
3159 case DEFER
: return DEFER
;
3167 /*************************************************
3168 * Check a specific host matches a host list *
3169 *************************************************/
3171 /* This function is passed a host list containing items in a number of
3172 different formats and the identity of a host. Its job is to determine whether
3173 the given host is in the set of hosts defined by the list. The host name is
3174 passed as a pointer so that it can be looked up if needed and not already
3175 known. This is commonly the case when called from verify_check_host() to check
3176 an incoming connection. When called from elsewhere the host name should usually
3179 This function is now just a front end to match_check_list(), which runs common
3180 code for scanning a list. We pass it the check_host() function to perform a
3184 listptr pointer to the host list
3185 cache_bits pointer to cache for named lists, or NULL
3186 host_name the host name or NULL, implying use sender_host_name and
3187 sender_host_aliases, looking them up if required
3188 host_address the IP address
3189 valueptr if not NULL, data from a lookup is passed back here
3191 Returns: OK if the host is in the defined set
3192 FAIL if the host is not in the defined set,
3193 DEFER if a data lookup deferred (not a host lookup)
3195 If the host name was needed in order to make a comparison, and could not be
3196 determined from the IP address, the result is FAIL unless the item
3197 "+allow_unknown" was met earlier in the list, in which case OK is returned. */
3200 verify_check_this_host(const uschar
**listptr
, unsigned int *cache_bits
,
3201 const uschar
*host_name
, const uschar
*host_address
, const uschar
**valueptr
)
3204 unsigned int *local_cache_bits
= cache_bits
;
3205 const uschar
*save_host_address
= deliver_host_address
;
3206 check_host_block cb
= { .host_name
= host_name
, .host_address
= host_address
};
3208 if (valueptr
) *valueptr
= NULL
;
3210 /* If the host address starts off ::ffff: it is an IPv6 address in
3211 IPv4-compatible mode. Find the IPv4 part for checking against IPv4
3214 cb
.host_ipv4
= Ustrncmp(host_address
, "::ffff:", 7) == 0
3215 ? host_address
+ 7 : host_address
;
3217 /* During the running of the check, put the IP address into $host_address. In
3218 the case of calls from the smtp transport, it will already be there. However,
3219 in other calls (e.g. when testing ignore_target_hosts), it won't. Just to be on
3220 the safe side, any existing setting is preserved, though as I write this
3221 (November 2004) I can't see any cases where it is actually needed. */
3223 deliver_host_address
= host_address
;
3224 rc
= match_check_list(
3225 listptr
, /* the list */
3226 0, /* separator character */
3227 &hostlist_anchor
, /* anchor pointer */
3228 &local_cache_bits
, /* cache pointer */
3229 check_host
, /* function for testing */
3230 &cb
, /* argument for function */
3231 MCL_HOST
, /* type of check */
3232 (host_address
== sender_host_address
)?
3233 US
"host" : host_address
, /* text for debugging */
3234 valueptr
); /* where to pass back data */
3235 deliver_host_address
= save_host_address
;
3242 /*************************************************
3243 * Check the given host item matches a list *
3244 *************************************************/
3246 verify_check_given_host(const uschar
**listptr
, const host_item
*host
)
3248 return verify_check_this_host(listptr
, NULL
, host
->name
, host
->address
, NULL
);
3251 /*************************************************
3252 * Check the remote host matches a list *
3253 *************************************************/
3255 /* This is a front end to verify_check_this_host(), created because checking
3256 the remote host is a common occurrence. With luck, a good compiler will spot
3257 the tail recursion and optimize it. If there's no host address, this is
3258 command-line SMTP input - check against an empty string for the address.
3261 listptr pointer to the host list
3263 Returns: the yield of verify_check_this_host(),
3264 i.e. OK, FAIL, or DEFER
3268 verify_check_host(uschar
**listptr
)
3270 return verify_check_this_host(CUSS listptr
, sender_host_cache
, NULL
,
3271 sender_host_address
? sender_host_address
: US
"", NULL
);
3278 /*************************************************
3279 * Invert an IP address *
3280 *************************************************/
3282 /* Originally just used for DNS xBL lists, now also used for the
3283 reverse_ip expansion operator.
3286 buffer where to put the answer
3287 address the address to invert
3291 invert_address(uschar
*buffer
, uschar
*address
)
3294 uschar
*bptr
= buffer
;
3296 /* If this is an IPv4 address mapped into IPv6 format, adjust the pointer
3297 to the IPv4 part only. */
3299 if (Ustrncmp(address
, "::ffff:", 7) == 0) address
+= 7;
3301 /* Handle IPv4 address: when HAVE_IPV6 is false, the result of host_aton() is
3304 if (host_aton(address
, bin
) == 1)
3307 for (int i
= 0; i
< 4; i
++)
3309 sprintf(CS bptr
, "%d.", x
& 255);
3310 while (*bptr
) bptr
++;
3315 /* Handle IPv6 address. Actually, as far as I know, there are no IPv6 addresses
3316 in any DNS black lists, and the format in which they will be looked up is
3317 unknown. This is just a guess. */
3321 for (int j
= 3; j
>= 0; j
--)
3324 for (int i
= 0; i
< 8; i
++)
3326 sprintf(CS bptr
, "%x.", x
& 15);
3327 while (*bptr
) bptr
++;
3333 /* Remove trailing period -- this is needed so that both arbitrary
3334 dnsbl keydomains and inverted addresses may be combined with the
3335 same format string, "%s.%s" */
3342 /*************************************************
3343 * Perform a single dnsbl lookup *
3344 *************************************************/
3346 /* This function is called from verify_check_dnsbl() below. It is also called
3347 recursively from within itself when domain and domain_txt are different
3348 pointers, in order to get the TXT record from the alternate domain.
3351 domain the outer dnsbl domain
3352 domain_txt alternate domain to lookup TXT record on success; when the
3353 same domain is to be used, domain_txt == domain (that is,
3354 the pointers must be identical, not just the text)
3355 keydomain the current keydomain (for debug message)
3356 prepend subdomain to lookup (like keydomain, but
3357 reversed if IP address)
3358 iplist the list of matching IP addresses, or NULL for "any"
3359 bitmask true if bitmask matching is wanted
3360 match_type condition for 'succeed' result
3361 0 => Any RR in iplist (=)
3362 1 => No RR in iplist (!=)
3363 2 => All RRs in iplist (==)
3364 3 => Some RRs not in iplist (!==)
3365 the two bits are defined as MT_NOT and MT_ALL
3366 defer_return what to return for a defer
3368 Returns: OK if lookup succeeded
3373 one_check_dnsbl(uschar
*domain
, uschar
*domain_txt
, uschar
*keydomain
,
3374 uschar
*prepend
, uschar
*iplist
, BOOL bitmask
, int match_type
,
3377 dns_answer
* dnsa
= store_get_dns_answer();
3380 dnsbl_cache_block
*cb
;
3381 int old_pool
= store_pool
;
3382 uschar query
[256]; /* DNS domain max length */
3384 /* Construct the specific query domainname */
3386 if (!string_format(query
, sizeof(query
), "%s.%s", prepend
, domain
))
3388 log_write(0, LOG_MAIN
|LOG_PANIC
, "dnslist query is too long "
3389 "(ignored): %s...", query
);
3393 /* Look for this query in the cache. */
3395 if ( (t
= tree_search(dnsbl_cache
, query
))
3396 && (cb
= t
->data
.ptr
)->expiry
> time(NULL
)
3399 /* Previous lookup was cached */
3402 HDEBUG(D_dnsbl
) debug_printf("dnslists: using result of previous lookup\n");
3405 /* If not cached from a previous lookup, we must do a DNS lookup, and
3406 cache the result in permanent memory. */
3410 uint ttl
= 3600; /* max TTL for positive cache entries */
3412 store_pool
= POOL_PERM
;
3416 HDEBUG(D_dnsbl
) debug_printf("cached data found but past valid time; ");
3420 { /* Set up a tree entry to cache the lookup */
3421 t
= store_get(sizeof(tree_node
) + Ustrlen(query
), is_tainted(query
));
3422 Ustrcpy(t
->name
, query
);
3423 t
->data
.ptr
= cb
= store_get(sizeof(dnsbl_cache_block
), FALSE
);
3424 (void)tree_insertnode(&dnsbl_cache
, t
);
3427 /* Do the DNS lookup . */
3429 HDEBUG(D_dnsbl
) debug_printf("new DNS lookup for %s\n", query
);
3430 cb
->rc
= dns_basic_lookup(dnsa
, query
, T_A
);
3431 cb
->text_set
= FALSE
;
3435 /* If the lookup succeeded, cache the RHS address. The code allows for
3436 more than one address - this was for complete generality and the possible
3437 use of A6 records. However, A6 records are no longer supported. Leave the code
3440 Quite apart from one A6 RR generating multiple addresses, there are DNS
3441 lists that return more than one A record, so we must handle multiple
3442 addresses generated in that way as well.
3444 Mark the cache entry with the "now" plus the minimum of the address TTLs,
3445 or the RFC 2308 negative-cache value from the SOA if none were found. */
3451 dns_address
** addrp
= &cb
->rhs
;
3453 for (dns_record
* rr
= dns_next_rr(dnsa
, &dnss
, RESET_ANSWERS
); rr
;
3454 rr
= dns_next_rr(dnsa
, &dnss
, RESET_NEXT
))
3455 if (rr
->type
== T_A
&& (da
= dns_address_from_rr(dnsa
, rr
)))
3458 while (da
->next
) da
= da
->next
;
3460 if (ttl
> rr
->ttl
) ttl
= rr
->ttl
;
3465 cb
->expiry
= time(NULL
) + ttl
;
3469 /* If we didn't find any A records, change the return code. This can
3470 happen when there is a CNAME record but there are no A records for what
3473 cb
->rc
= DNS_NODATA
;
3480 /* Although there already is a neg-cache layer maintained by
3481 dns_basic_lookup(), we have a dnslist cache entry allocated and
3482 tree-inserted. So we may as well use it. */
3484 time_t soa_negttl
= dns_expire_from_soa(dnsa
, T_A
);
3485 cb
->expiry
= soa_negttl
? soa_negttl
: time(NULL
) + ttl
;
3490 cb
->expiry
= time(NULL
) + ttl
;
3494 store_pool
= old_pool
;
3495 HDEBUG(D_dnsbl
) debug_printf("dnslists: wrote cache entry, ttl=%d\n",
3496 (int)(cb
->expiry
- time(NULL
)));
3499 /* We now have the result of the DNS lookup, either newly done, or cached
3500 from a previous call. If the lookup succeeded, check against the address
3501 list if there is one. This may be a positive equality list (introduced by
3502 "="), a negative equality list (introduced by "!="), a positive bitmask
3503 list (introduced by "&"), or a negative bitmask list (introduced by "!&").*/
3505 if (cb
->rc
== DNS_SUCCEED
)
3507 dns_address
* da
= NULL
;
3508 uschar
*addlist
= cb
->rhs
->address
;
3510 /* For A and AAAA records, there may be multiple addresses from multiple
3511 records. For A6 records (currently not expected to be used) there may be
3512 multiple addresses from a single record. */
3514 for (da
= cb
->rhs
->next
; da
; da
= da
->next
)
3515 addlist
= string_sprintf("%s, %s", addlist
, da
->address
);
3517 HDEBUG(D_dnsbl
) debug_printf("DNS lookup for %s succeeded (yielding %s)\n",
3520 /* Address list check; this can be either for equality, or via a bitmask.
3521 In the latter case, all the bits must match. */
3525 for (da
= cb
->rhs
; da
; da
= da
->next
)
3529 const uschar
*ptr
= iplist
;
3532 /* Handle exact matching */
3536 while ((res
= string_nextinlist(&ptr
, &ipsep
, ip
, sizeof(ip
))))
3537 if (Ustrcmp(CS da
->address
, ip
) == 0)
3541 /* Handle bitmask matching */
3548 /* At present, all known DNS blocking lists use A records, with
3549 IPv4 addresses on the RHS encoding the information they return. I
3550 wonder if this will linger on as the last vestige of IPv4 when IPv6
3551 is ubiquitous? Anyway, for now we use paranoia code to completely
3552 ignore IPv6 addresses. The default mask is 0, which always matches.
3553 We change this only for IPv4 addresses in the list. */
3555 if (host_aton(da
->address
, address
) == 1) mask
= address
[0];
3557 /* Scan the returned addresses, skipping any that are IPv6 */
3559 while ((res
= string_nextinlist(&ptr
, &ipsep
, ip
, sizeof(ip
))))
3561 if (host_aton(ip
, address
) != 1) continue;
3562 if ((address
[0] & mask
) == address
[0]) break;
3568 (a) An IP address in an any ('=') list matched, or
3569 (b) No IP address in an all ('==') list matched
3571 then we're done searching. */
3573 if (((match_type
& MT_ALL
) != 0) == (res
== NULL
)) break;
3576 /* If da == NULL, either
3578 (a) No IP address in an any ('=') list matched, or
3579 (b) An IP address in an all ('==') list didn't match
3581 so behave as if the DNSBL lookup had not succeeded, i.e. the host is not on
3584 if ((match_type
== MT_NOT
|| match_type
== MT_ALL
) != (da
== NULL
))
3592 res
= US
"was no match"; break;
3594 res
= US
"was an exclude match"; break;
3596 res
= US
"was an IP address that did not match"; break;
3598 res
= US
"were no IP addresses that did not match"; break;
3600 debug_printf("=> but we are not accepting this block class because\n");
3601 debug_printf("=> there %s for %s%c%s\n",
3603 ((match_type
& MT_ALL
) == 0)? "" : "=",
3604 bitmask
? '&' : '=', iplist
);
3610 /* Either there was no IP list, or the record matched, implying that the
3611 domain is on the list. We now want to find a corresponding TXT record. If an
3612 alternate domain is specified for the TXT record, call this function
3613 recursively to look that up; this has the side effect of re-checking that
3614 there is indeed an A record at the alternate domain. */
3616 if (domain_txt
!= domain
)
3617 return one_check_dnsbl(domain_txt
, domain_txt
, keydomain
, prepend
, NULL
,
3618 FALSE
, match_type
, defer_return
);
3620 /* If there is no alternate domain, look up a TXT record in the main domain
3621 if it has not previously been cached. */
3625 cb
->text_set
= TRUE
;
3626 if (dns_basic_lookup(dnsa
, query
, T_TXT
) == DNS_SUCCEED
)
3627 for (dns_record
* rr
= dns_next_rr(dnsa
, &dnss
, RESET_ANSWERS
); rr
;
3628 rr
= dns_next_rr(dnsa
, &dnss
, RESET_NEXT
))
3629 if (rr
->type
== T_TXT
)
3631 int len
= (rr
->data
)[0];
3632 if (len
> 511) len
= 127;
3633 store_pool
= POOL_PERM
;
3634 cb
->text
= string_sprintf("%.*s", len
, CUS (rr
->data
+1));
3635 store_pool
= old_pool
;
3640 dnslist_value
= addlist
;
3641 dnslist_text
= cb
->text
;
3645 /* There was a problem with the DNS lookup */
3647 if (cb
->rc
!= DNS_NOMATCH
&& cb
->rc
!= DNS_NODATA
)
3649 log_write(L_dnslist_defer
, LOG_MAIN
,
3650 "DNS list lookup defer (probably timeout) for %s: %s", query
,
3651 (defer_return
== OK
)? US
"assumed in list" :
3652 (defer_return
== FAIL
)? US
"assumed not in list" :
3653 US
"returned DEFER");
3654 return defer_return
;
3657 /* No entry was found in the DNS; continue for next domain */
3661 debug_printf("DNS lookup for %s failed\n", query
);
3662 debug_printf("=> that means %s is not listed at %s\n",
3672 /*************************************************
3673 * Check host against DNS black lists *
3674 *************************************************/
3676 /* This function runs checks against a list of DNS black lists, until one
3677 matches. Each item on the list can be of the form
3679 domain=ip-address/key
3681 The domain is the right-most domain that is used for the query, for example,
3682 blackholes.mail-abuse.org. If the IP address is present, there is a match only
3683 if the DNS lookup returns a matching IP address. Several addresses may be
3684 given, comma-separated, for example: x.y.z=127.0.0.1,127.0.0.2.
3686 If no key is given, what is looked up in the domain is the inverted IP address
3687 of the current client host. If a key is given, it is used to construct the
3688 domain for the lookup. For example:
3690 dsn.rfc-ignorant.org/$sender_address_domain
3692 After finding a match in the DNS, the domain is placed in $dnslist_domain, and
3693 then we check for a TXT record for an error message, and if found, save its
3694 value in $dnslist_text. We also cache everything in a tree, to optimize
3697 The TXT record is normally looked up in the same domain as the A record, but
3698 when many lists are combined in a single DNS domain, this will not be a very
3699 specific message. It is possible to specify a different domain for looking up
3700 TXT records; this is given before the main domain, comma-separated. For
3703 dnslists = http.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.2 : \
3704 socks.dnsbl.sorbs.net,dnsbl.sorbs.net=127.0.0.3
3706 The caching ensures that only one lookup in dnsbl.sorbs.net is done.
3708 Note: an address for testing RBL is 192.203.178.39
3709 Note: an address for testing DUL is 192.203.178.4
3710 Note: a domain for testing RFCI is example.tld.dsn.rfc-ignorant.org
3714 listptr the domain/address/data list
3715 log_msgptr log message on error
3717 Returns: OK successful lookup (i.e. the address is on the list), or
3718 lookup deferred after +include_unknown
3719 FAIL name not found, or no data found for the given type, or
3720 lookup deferred after +exclude_unknown (default)
3721 DEFER lookup failure, if +defer_unknown was set
3725 verify_check_dnsbl(int where
, const uschar
** listptr
, uschar
** log_msgptr
)
3728 int defer_return
= FAIL
;
3729 const uschar
*list
= *listptr
;
3731 uschar buffer
[1024];
3732 uschar revadd
[128]; /* Long enough for IPv6 address */
3734 /* Indicate that the inverted IP address is not yet set up */
3738 /* In case this is the first time the DNS resolver is being used. */
3740 dns_init(FALSE
, FALSE
, FALSE
); /*XXX dnssec? */
3742 /* Loop through all the domains supplied, until something matches */
3744 while ((domain
= string_nextinlist(&list
, &sep
, buffer
, sizeof(buffer
))))
3747 BOOL bitmask
= FALSE
;
3754 HDEBUG(D_dnsbl
) debug_printf("dnslists check: %s\n", domain
);
3756 /* Deal with special values that change the behaviour on defer */
3758 if (domain
[0] == '+')
3760 if (strcmpic(domain
, US
"+include_unknown") == 0) defer_return
= OK
;
3761 else if (strcmpic(domain
, US
"+exclude_unknown") == 0) defer_return
= FAIL
;
3762 else if (strcmpic(domain
, US
"+defer_unknown") == 0) defer_return
= DEFER
;
3764 log_write(0, LOG_MAIN
|LOG_PANIC
, "unknown item in dnslist (ignored): %s",
3769 /* See if there's explicit data to be looked up */
3771 if ((key
= Ustrchr(domain
, '/'))) *key
++ = 0;
3773 /* See if there's a list of addresses supplied after the domain name. This is
3774 introduced by an = or a & character; if preceded by = we require all matches
3775 and if preceded by ! we invert the result. */
3777 if (!(iplist
= Ustrchr(domain
, '=')))
3780 iplist
= Ustrchr(domain
, '&');
3783 if (iplist
) /* Found either = or & */
3785 if (iplist
> domain
&& iplist
[-1] == '!') /* Handle preceding ! */
3787 match_type
|= MT_NOT
;
3791 *iplist
++ = 0; /* Terminate domain, move on */
3793 /* If we found = (bitmask == FALSE), check for == or =& */
3795 if (!bitmask
&& (*iplist
== '=' || *iplist
== '&'))
3797 bitmask
= *iplist
++ == '&';
3798 match_type
|= MT_ALL
;
3803 /* If there is a comma in the domain, it indicates that a second domain for
3804 looking up TXT records is provided, before the main domain. Otherwise we must
3805 set domain_txt == domain. */
3807 domain_txt
= domain
;
3808 if ((comma
= Ustrchr(domain
, ',')))
3814 /* Check that what we have left is a sensible domain name. There is no reason
3815 why these domains should in fact use the same syntax as hosts and email
3816 domains, but in practice they seem to. However, there is little point in
3817 actually causing an error here, because that would no doubt hold up incoming
3818 mail. Instead, I'll just log it. */
3820 for (uschar
* s
= domain
; *s
; s
++)
3821 if (!isalnum(*s
) && *s
!= '-' && *s
!= '.' && *s
!= '_')
3823 log_write(0, LOG_MAIN
, "dnslists domain \"%s\" contains "
3824 "strange characters - is this right?", domain
);
3828 /* Check the alternate domain if present */
3830 if (domain_txt
!= domain
) for (uschar
* s
= domain_txt
; *s
; s
++)
3831 if (!isalnum(*s
) && *s
!= '-' && *s
!= '.' && *s
!= '_')
3833 log_write(0, LOG_MAIN
, "dnslists domain \"%s\" contains "
3834 "strange characters - is this right?", domain_txt
);
3838 /* If there is no key string, construct the query by adding the domain name
3839 onto the inverted host address, and perform a single DNS lookup. */
3843 if (where
== ACL_WHERE_NOTSMTP_START
|| where
== ACL_WHERE_NOTSMTP
)
3845 *log_msgptr
= string_sprintf
3846 ("cannot test auto-keyed dnslists condition in %s ACL",
3847 acl_wherenames
[where
]);
3850 if (!sender_host_address
) return FAIL
; /* can never match */
3851 if (revadd
[0] == 0) invert_address(revadd
, sender_host_address
);
3852 rc
= one_check_dnsbl(domain
, domain_txt
, sender_host_address
, revadd
,
3853 iplist
, bitmask
, match_type
, defer_return
);
3856 dnslist_domain
= string_copy(domain_txt
);
3857 dnslist_matched
= string_copy(sender_host_address
);
3858 HDEBUG(D_dnsbl
) debug_printf("=> that means %s is listed at %s\n",
3859 sender_host_address
, dnslist_domain
);
3861 if (rc
!= FAIL
) return rc
; /* OK or DEFER */
3864 /* If there is a key string, it can be a list of domains or IP addresses to
3865 be concatenated with the main domain. */
3872 uschar keyrevadd
[128];
3874 while ((keydomain
= string_nextinlist(CUSS
&key
, &keysep
, NULL
, 0)))
3876 uschar
*prepend
= keydomain
;
3878 if (string_is_ip_address(keydomain
, NULL
) != 0)
3880 invert_address(keyrevadd
, keydomain
);
3881 prepend
= keyrevadd
;
3884 rc
= one_check_dnsbl(domain
, domain_txt
, keydomain
, prepend
, iplist
,
3885 bitmask
, match_type
, defer_return
);
3888 dnslist_domain
= string_copy(domain_txt
);
3889 dnslist_matched
= string_copy(keydomain
);
3890 HDEBUG(D_dnsbl
) debug_printf("=> that means %s is listed at %s\n",
3891 keydomain
, dnslist_domain
);
3895 /* If the lookup deferred, remember this fact. We keep trying the rest
3896 of the list to see if we get a useful result, and if we don't, we return
3897 DEFER at the end. */
3899 if (rc
== DEFER
) defer
= TRUE
;
3900 } /* continue with next keystring domain/address */
3902 if (defer
) return DEFER
;
3904 } /* continue with next dnsdb outer domain */
3911 /* End of verify.c */