2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 1994-1998
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
22 /* nmbd.c sets this to True. */
23 BOOL global_in_nmbd
= False
;
25 /****************************
26 * SERVER AFFINITY ROUTINES *
27 ****************************/
29 /* Server affinity is the concept of preferring the last domain
30 controller with whom you had a successful conversation */
32 /****************************************************************************
33 ****************************************************************************/
34 #define SAFKEY_FMT "SAF/DOMAIN/%s"
37 static char *saf_key(const char *domain
)
41 asprintf( &keystr
, SAFKEY_FMT
, strupper_static(domain
) );
46 /****************************************************************************
47 ****************************************************************************/
49 BOOL
saf_store( const char *domain
, const char *servername
)
55 if ( !domain
|| !servername
) {
56 DEBUG(2,("saf_store: Refusing to store empty domain or servername!\n"));
60 if ( (strlen(domain
) == 0) || (strlen(servername
) == 0) ) {
61 DEBUG(0,("saf_store: refusing to store 0 length domain or servername!\n"));
65 if ( !gencache_init() )
68 key
= saf_key( domain
);
69 expire
= time( NULL
) + SAF_TTL
;
72 DEBUG(10,("saf_store: domain = [%s], server = [%s], expire = [%u]\n",
73 domain
, servername
, (unsigned int)expire
));
75 ret
= gencache_set( key
, servername
, expire
);
82 BOOL
saf_delete( const char *domain
)
88 DEBUG(2,("saf_delete: Refusing to delete empty domain\n"));
92 if ( !gencache_init() )
95 key
= saf_key(domain
);
96 ret
= gencache_del(key
);
99 DEBUG(10,("saf_delete: domain = [%s]\n", domain
));
107 /****************************************************************************
108 ****************************************************************************/
110 char *saf_fetch( const char *domain
)
117 if ( !domain
|| strlen(domain
) == 0) {
118 DEBUG(2,("saf_fetch: Empty domain name!\n"));
122 if ( !gencache_init() )
125 key
= saf_key( domain
);
127 ret
= gencache_get( key
, &server
, &timeout
);
132 DEBUG(5,("saf_fetch: failed to find server for \"%s\" domain\n", domain
));
134 DEBUG(5,("saf_fetch: Returning \"%s\" for \"%s\" domain\n",
141 /****************************************************************************
142 Generate a random trn_id.
143 ****************************************************************************/
145 static int generate_trn_id(void)
149 generate_random_buffer((uint8
*)&id
, sizeof(id
));
151 return id
% (unsigned)0x7FFF;
154 /****************************************************************************
155 Parse a node status response into an array of structures.
156 ****************************************************************************/
158 static NODE_STATUS_STRUCT
*parse_node_status(char *p
, int *num_names
, struct node_status_extra
*extra
)
160 NODE_STATUS_STRUCT
*ret
;
163 *num_names
= CVAL(p
,0);
168 ret
= SMB_MALLOC_ARRAY(NODE_STATUS_STRUCT
,*num_names
);
173 for (i
=0;i
< *num_names
;i
++) {
174 StrnCpy(ret
[i
].name
,p
,15);
175 trim_char(ret
[i
].name
,'\0',' ');
176 ret
[i
].type
= CVAL(p
,15);
177 ret
[i
].flags
= p
[16];
179 DEBUG(10, ("%s#%02x: flags = 0x%02x\n", ret
[i
].name
,
180 ret
[i
].type
, ret
[i
].flags
));
183 * Also, pick up the MAC address ...
186 memcpy(&extra
->mac_addr
, p
, 6); /* Fill in the mac addr */
192 /****************************************************************************
193 Do a NBT node status query on an open socket and return an array of
194 structures holding the returned names or NULL if the query failed.
195 **************************************************************************/
197 NODE_STATUS_STRUCT
*node_status_query(int fd
,struct nmb_name
*name
,
198 struct in_addr to_ip
, int *num_names
,
199 struct node_status_extra
*extra
)
203 int retry_time
= 2000;
205 struct packet_struct p
;
206 struct packet_struct
*p2
;
207 struct nmb_packet
*nmb
= &p
.packet
.nmb
;
208 NODE_STATUS_STRUCT
*ret
;
212 nmb
->header
.name_trn_id
= generate_trn_id();
213 nmb
->header
.opcode
= 0;
214 nmb
->header
.response
= False
;
215 nmb
->header
.nm_flags
.bcast
= False
;
216 nmb
->header
.nm_flags
.recursion_available
= False
;
217 nmb
->header
.nm_flags
.recursion_desired
= False
;
218 nmb
->header
.nm_flags
.trunc
= False
;
219 nmb
->header
.nm_flags
.authoritative
= False
;
220 nmb
->header
.rcode
= 0;
221 nmb
->header
.qdcount
= 1;
222 nmb
->header
.ancount
= 0;
223 nmb
->header
.nscount
= 0;
224 nmb
->header
.arcount
= 0;
225 nmb
->question
.question_name
= *name
;
226 nmb
->question
.question_type
= 0x21;
227 nmb
->question
.question_class
= 0x1;
232 p
.timestamp
= time(NULL
);
233 p
.packet_type
= NMB_PACKET
;
237 if (!send_packet(&p
))
243 struct timeval tval2
;
244 GetTimeOfDay(&tval2
);
245 if (TvalDiff(&tval
,&tval2
) > retry_time
) {
248 if (!found
&& !send_packet(&p
))
254 if ((p2
=receive_nmb_packet(fd
,90,nmb
->header
.name_trn_id
))) {
255 struct nmb_packet
*nmb2
= &p2
->packet
.nmb
;
256 debug_nmb_packet(p2
);
258 if (nmb2
->header
.opcode
!= 0 ||
259 nmb2
->header
.nm_flags
.bcast
||
260 nmb2
->header
.rcode
||
261 !nmb2
->header
.ancount
||
262 nmb2
->answers
->rr_type
!= 0x21) {
263 /* XXXX what do we do with this? could be a
264 redirect, but we'll discard it for the
270 ret
= parse_node_status(&nmb2
->answers
->rdata
[0], num_names
, extra
);
279 /****************************************************************************
280 Find the first type XX name in a node status reply - used for finding
281 a servers name given its IP. Return the matched name in *name.
282 **************************************************************************/
284 BOOL
name_status_find(const char *q_name
, int q_type
, int type
, struct in_addr to_ip
, fstring name
)
286 NODE_STATUS_STRUCT
*status
= NULL
;
287 struct nmb_name nname
;
292 if (lp_disable_netbios()) {
293 DEBUG(5,("name_status_find(%s#%02x): netbios is disabled\n", q_name
, q_type
));
297 DEBUG(10, ("name_status_find: looking up %s#%02x at %s\n", q_name
,
298 q_type
, inet_ntoa(to_ip
)));
300 /* Check the cache first. */
302 if (namecache_status_fetch(q_name
, q_type
, type
, to_ip
, name
))
305 sock
= open_socket_in(SOCK_DGRAM
, 0, 3, interpret_addr(lp_socket_address()), True
);
309 /* W2K PDC's seem not to respond to '*'#0. JRA */
310 make_nmb_name(&nname
, q_name
, q_type
);
311 status
= node_status_query(sock
, &nname
, to_ip
, &count
, NULL
);
316 for (i
=0;i
<count
;i
++) {
317 if (status
[i
].type
== type
)
323 pull_ascii_nstring(name
, sizeof(fstring
), status
[i
].name
);
325 /* Store the result in the cache. */
326 /* but don't store an entry for 0x1c names here. Here we have
327 a single host and DOMAIN<0x1c> names should be a list of hosts */
329 if ( q_type
!= 0x1c )
330 namecache_status_store(q_name
, q_type
, type
, to_ip
, name
);
337 DEBUG(10, ("name_status_find: name %sfound", result
? "" : "not "));
340 DEBUGADD(10, (", name %s ip address is %s", name
, inet_ntoa(to_ip
)));
348 comparison function used by sort_ip_list
351 static int ip_compare(struct in_addr
*ip1
, struct in_addr
*ip2
)
353 int max_bits1
=0, max_bits2
=0;
354 int num_interfaces
= iface_count();
357 for (i
=0;i
<num_interfaces
;i
++) {
360 ip
= *iface_n_bcast(i
);
361 bits1
= matching_quad_bits((uchar
*)&ip1
->s_addr
, (uchar
*)&ip
.s_addr
);
362 bits2
= matching_quad_bits((uchar
*)&ip2
->s_addr
, (uchar
*)&ip
.s_addr
);
363 max_bits1
= MAX(bits1
, max_bits1
);
364 max_bits2
= MAX(bits2
, max_bits2
);
367 /* bias towards directly reachable IPs */
368 if (iface_local(*ip1
)) {
371 if (iface_local(*ip2
)) {
375 return max_bits2
- max_bits1
;
378 /*******************************************************************
379 compare 2 ldap IPs by nearness to our interfaces - used in qsort
380 *******************************************************************/
382 int ip_service_compare(struct ip_service
*ip1
, struct ip_service
*ip2
)
386 if ( (result
= ip_compare(&ip1
->ip
, &ip2
->ip
)) != 0 )
389 if ( ip1
->port
> ip2
->port
)
392 if ( ip1
->port
< ip2
->port
)
399 sort an IP list so that names that are close to one of our interfaces
400 are at the top. This prevents the problem where a WINS server returns an IP that
401 is not reachable from our subnet as the first match
404 static void sort_ip_list(struct in_addr
*iplist
, int count
)
410 qsort(iplist
, count
, sizeof(struct in_addr
), QSORT_CAST ip_compare
);
413 static void sort_ip_list2(struct ip_service
*iplist
, int count
)
419 qsort(iplist
, count
, sizeof(struct ip_service
), QSORT_CAST ip_service_compare
);
422 /**********************************************************************
423 Remove any duplicate address/port pairs in the list
424 *********************************************************************/
426 static int remove_duplicate_addrs2( struct ip_service
*iplist
, int count
)
430 DEBUG(10,("remove_duplicate_addrs2: looking for duplicate address/port pairs\n"));
432 /* one loop to remove duplicates */
433 for ( i
=0; i
<count
; i
++ ) {
434 if ( is_zero_ip(iplist
[i
].ip
) )
437 for ( j
=i
+1; j
<count
; j
++ ) {
438 if ( ip_service_equal(iplist
[i
], iplist
[j
]) )
439 zero_ip(&iplist
[j
].ip
);
443 /* one loop to clean up any holes we left */
444 /* first ip should never be a zero_ip() */
445 for (i
= 0; i
<count
; ) {
446 if ( is_zero_ip(iplist
[i
].ip
) ) {
448 memmove(&iplist
[i
], &iplist
[i
+1], (count
- i
- 1)*sizeof(iplist
[i
]));
458 /****************************************************************************
459 Do a netbios name query to find someones IP.
460 Returns an array of IP addresses or NULL if none.
461 *count will be set to the number of addresses returned.
462 *timed_out is set if we failed by timing out
463 ****************************************************************************/
465 struct in_addr
*name_query(int fd
,const char *name
,int name_type
,
466 BOOL bcast
,BOOL recurse
,
467 struct in_addr to_ip
, int *count
, int *flags
,
472 int retry_time
= bcast
?250:2000;
474 struct packet_struct p
;
475 struct packet_struct
*p2
;
476 struct nmb_packet
*nmb
= &p
.packet
.nmb
;
477 struct in_addr
*ip_list
= NULL
;
479 if (lp_disable_netbios()) {
480 DEBUG(5,("name_query(%s#%02x): netbios is disabled\n", name
, name_type
));
488 memset((char *)&p
,'\0',sizeof(p
));
492 nmb
->header
.name_trn_id
= generate_trn_id();
493 nmb
->header
.opcode
= 0;
494 nmb
->header
.response
= False
;
495 nmb
->header
.nm_flags
.bcast
= bcast
;
496 nmb
->header
.nm_flags
.recursion_available
= False
;
497 nmb
->header
.nm_flags
.recursion_desired
= recurse
;
498 nmb
->header
.nm_flags
.trunc
= False
;
499 nmb
->header
.nm_flags
.authoritative
= False
;
500 nmb
->header
.rcode
= 0;
501 nmb
->header
.qdcount
= 1;
502 nmb
->header
.ancount
= 0;
503 nmb
->header
.nscount
= 0;
504 nmb
->header
.arcount
= 0;
506 make_nmb_name(&nmb
->question
.question_name
,name
,name_type
);
508 nmb
->question
.question_type
= 0x20;
509 nmb
->question
.question_class
= 0x1;
514 p
.timestamp
= time(NULL
);
515 p
.packet_type
= NMB_PACKET
;
519 if (!send_packet(&p
))
525 struct timeval tval2
;
527 GetTimeOfDay(&tval2
);
528 if (TvalDiff(&tval
,&tval2
) > retry_time
) {
531 if (!found
&& !send_packet(&p
))
537 if ((p2
=receive_nmb_packet(fd
,90,nmb
->header
.name_trn_id
))) {
538 struct nmb_packet
*nmb2
= &p2
->packet
.nmb
;
539 debug_nmb_packet(p2
);
541 /* If we get a Negative Name Query Response from a WINS
542 * server, we should report it and give up.
544 if( 0 == nmb2
->header
.opcode
/* A query response */
545 && !(bcast
) /* from a WINS server */
546 && nmb2
->header
.rcode
/* Error returned */
549 if( DEBUGLVL( 3 ) ) {
550 /* Only executed if DEBUGLEVEL >= 3 */
551 dbgtext( "Negative name query response, rcode 0x%02x: ", nmb2
->header
.rcode
);
552 switch( nmb2
->header
.rcode
) {
554 dbgtext( "Request was invalidly formatted.\n" );
557 dbgtext( "Problem with NBNS, cannot process name.\n");
560 dbgtext( "The name requested does not exist.\n" );
563 dbgtext( "Unsupported request error.\n" );
566 dbgtext( "Query refused error.\n" );
569 dbgtext( "Unrecognized error code.\n" );
577 if (nmb2
->header
.opcode
!= 0 ||
578 nmb2
->header
.nm_flags
.bcast
||
579 nmb2
->header
.rcode
||
580 !nmb2
->header
.ancount
) {
582 * XXXX what do we do with this? Could be a
583 * redirect, but we'll discard it for the
590 ip_list
= SMB_REALLOC_ARRAY( ip_list
, struct in_addr
,
591 (*count
) + nmb2
->answers
->rdlength
/6 );
594 DEBUG(0,("name_query: Realloc failed.\n"));
599 DEBUG(2,("Got a positive name query response from %s ( ", inet_ntoa(p2
->ip
)));
600 for (i
=0;i
<nmb2
->answers
->rdlength
/6;i
++) {
601 putip((char *)&ip_list
[(*count
)],&nmb2
->answers
->rdata
[2+i
*6]);
602 DEBUGADD(2,("%s ",inet_ntoa(ip_list
[(*count
)])));
609 /* We add the flags back ... */
610 if (nmb2
->header
.response
)
611 (*flags
) |= NM_FLAGS_RS
;
612 if (nmb2
->header
.nm_flags
.authoritative
)
613 (*flags
) |= NM_FLAGS_AA
;
614 if (nmb2
->header
.nm_flags
.trunc
)
615 (*flags
) |= NM_FLAGS_TC
;
616 if (nmb2
->header
.nm_flags
.recursion_desired
)
617 (*flags
) |= NM_FLAGS_RD
;
618 if (nmb2
->header
.nm_flags
.recursion_available
)
619 (*flags
) |= NM_FLAGS_RA
;
620 if (nmb2
->header
.nm_flags
.bcast
)
621 (*flags
) |= NM_FLAGS_B
;
624 * If we're doing a unicast lookup we only
625 * expect one reply. Don't wait the full 2
626 * seconds if we got one. JRA.
633 /* only set timed_out if we didn't fund what we where looking for*/
635 if ( !found
&& timed_out
) {
639 /* sort the ip list so we choose close servers first if possible */
640 sort_ip_list(ip_list
, *count
);
645 /********************************************************
646 Start parsing the lmhosts file.
647 *********************************************************/
649 XFILE
*startlmhosts(const char *fname
)
651 XFILE
*fp
= x_fopen(fname
,O_RDONLY
, 0);
653 DEBUG(4,("startlmhosts: Can't open lmhosts file %s. Error was %s\n",
654 fname
, strerror(errno
)));
660 /********************************************************
661 Parse the next line in the lmhosts file.
662 *********************************************************/
664 BOOL
getlmhostsent( XFILE
*fp
, pstring name
, int *name_type
, struct in_addr
*ipaddr
)
668 while(!x_feof(fp
) && !x_ferror(fp
)) {
669 pstring ip
,flags
,extra
;
676 if (!fgets_slash(line
,sizeof(pstring
),fp
)) {
690 if (next_token(&ptr
,ip
,NULL
,sizeof(ip
)))
692 if (next_token(&ptr
,name
,NULL
, sizeof(pstring
)))
694 if (next_token(&ptr
,flags
,NULL
, sizeof(flags
)))
696 if (next_token(&ptr
,extra
,NULL
, sizeof(extra
)))
702 if (count
> 0 && count
< 2) {
703 DEBUG(0,("getlmhostsent: Ill formed hosts line [%s]\n",line
));
708 DEBUG(0,("getlmhostsent: too many columns in lmhosts file (obsolete syntax)\n"));
712 DEBUG(4, ("getlmhostsent: lmhost entry: %s %s %s\n", ip
, name
, flags
));
714 if (strchr_m(flags
,'G') || strchr_m(flags
,'S')) {
715 DEBUG(0,("getlmhostsent: group flag in lmhosts ignored (obsolete)\n"));
719 *ipaddr
= *interpret_addr2(ip
);
721 /* Extra feature. If the name ends in '#XX', where XX is a hex number,
722 then only add that name type. */
723 if((ptr1
= strchr_m(name
, '#')) != NULL
) {
727 *name_type
= (int)strtol(ptr1
, &endptr
, 16);
728 if(!*ptr1
|| (endptr
== ptr1
)) {
729 DEBUG(0,("getlmhostsent: invalid name %s containing '#'.\n", name
));
733 *(--ptr1
) = '\0'; /* Truncate at the '#' */
742 /********************************************************
743 Finish parsing the lmhosts file.
744 *********************************************************/
746 void endlmhosts(XFILE
*fp
)
751 /********************************************************
752 convert an array if struct in_addrs to struct ip_service
753 return False on failure. Port is set to PORT_NONE;
754 *********************************************************/
756 static BOOL
convert_ip2service( struct ip_service
**return_iplist
, struct in_addr
*ip_list
, int count
)
760 if ( count
==0 || !ip_list
)
763 /* copy the ip address; port will be PORT_NONE */
764 if ( (*return_iplist
= SMB_MALLOC_ARRAY(struct ip_service
, count
)) == NULL
) {
765 DEBUG(0,("convert_ip2service: malloc failed for %d enetries!\n", count
));
769 for ( i
=0; i
<count
; i
++ ) {
770 (*return_iplist
)[i
].ip
= ip_list
[i
];
771 (*return_iplist
)[i
].port
= PORT_NONE
;
776 /********************************************************
777 Resolve via "bcast" method.
778 *********************************************************/
780 BOOL
name_resolve_bcast(const char *name
, int name_type
,
781 struct ip_service
**return_iplist
, int *return_count
)
784 int num_interfaces
= iface_count();
785 struct in_addr
*ip_list
;
788 if (lp_disable_netbios()) {
789 DEBUG(5,("name_resolve_bcast(%s#%02x): netbios is disabled\n", name
, name_type
));
793 *return_iplist
= NULL
;
797 * "bcast" means do a broadcast lookup on all the local interfaces.
800 DEBUG(3,("name_resolve_bcast: Attempting broadcast lookup for name %s<0x%x>\n", name
, name_type
));
802 sock
= open_socket_in( SOCK_DGRAM
, 0, 3,
803 interpret_addr(lp_socket_address()), True
);
805 if (sock
== -1) return False
;
807 set_socket_options(sock
,"SO_BROADCAST");
809 * Lookup the name on all the interfaces, return on
810 * the first successful match.
812 for( i
= num_interfaces
-1; i
>= 0; i
--) {
813 struct in_addr sendto_ip
;
815 /* Done this way to fix compiler error on IRIX 5.x */
816 sendto_ip
= *iface_n_bcast(i
);
817 ip_list
= name_query(sock
, name
, name_type
, True
,
818 True
, sendto_ip
, return_count
, &flags
, NULL
);
823 /* failed - no response */
830 if ( !convert_ip2service(return_iplist
, ip_list
, *return_count
) )
833 SAFE_FREE( ip_list
);
838 /********************************************************
839 Resolve via "wins" method.
840 *********************************************************/
842 BOOL
resolve_wins(const char *name
, int name_type
,
843 struct ip_service
**return_iplist
, int *return_count
)
847 struct in_addr src_ip
, *ip_list
= NULL
;
850 if (lp_disable_netbios()) {
851 DEBUG(5,("resolve_wins(%s#%02x): netbios is disabled\n", name
, name_type
));
855 *return_iplist
= NULL
;
858 DEBUG(3,("resolve_wins: Attempting wins lookup for name %s<0x%x>\n", name
, name_type
));
860 if (wins_srv_count() < 1) {
861 DEBUG(3,("resolve_wins: WINS server resolution selected and no WINS servers listed.\n"));
865 /* we try a lookup on each of the WINS tags in turn */
866 wins_tags
= wins_srv_tags();
869 /* huh? no tags?? give up in disgust */
873 /* the address we will be sending from */
874 src_ip
= *interpret_addr2(lp_socket_address());
876 /* in the worst case we will try every wins server with every
878 for (t
=0; wins_tags
&& wins_tags
[t
]; t
++) {
879 int srv_count
= wins_srv_count_tag(wins_tags
[t
]);
880 for (i
=0; i
<srv_count
; i
++) {
881 struct in_addr wins_ip
;
885 wins_ip
= wins_srv_ip_tag(wins_tags
[t
], src_ip
);
887 if (global_in_nmbd
&& ismyip(wins_ip
)) {
888 /* yikes! we'll loop forever */
892 /* skip any that have been unresponsive lately */
893 if (wins_srv_is_dead(wins_ip
, src_ip
)) {
897 DEBUG(3,("resolve_wins: using WINS server %s and tag '%s'\n", inet_ntoa(wins_ip
), wins_tags
[t
]));
899 sock
= open_socket_in(SOCK_DGRAM
, 0, 3, src_ip
.s_addr
, True
);
904 ip_list
= name_query(sock
,name
,name_type
, False
,
905 True
, wins_ip
, return_count
, &flags
,
908 /* exit loop if we got a list of addresses */
916 /* Timed out wating for WINS server to respond. Mark it dead. */
917 wins_srv_died(wins_ip
, src_ip
);
919 /* The name definately isn't in this
920 group of WINS servers. goto the next group */
926 wins_srv_tags_free(wins_tags
);
931 if ( !convert_ip2service( return_iplist
, ip_list
, *return_count
) )
934 SAFE_FREE( ip_list
);
935 wins_srv_tags_free(wins_tags
);
941 /********************************************************
942 Resolve via "lmhosts" method.
943 *********************************************************/
945 static BOOL
resolve_lmhosts(const char *name
, int name_type
,
946 struct ip_service
**return_iplist
, int *return_count
)
949 * "lmhosts" means parse the local lmhosts file.
955 struct in_addr return_ip
;
958 *return_iplist
= NULL
;
961 DEBUG(3,("resolve_lmhosts: Attempting lmhosts lookup for name %s<0x%x>\n", name
, name_type
));
963 fp
= startlmhosts(dyn_LMHOSTSFILE
);
968 while (getlmhostsent(fp
, lmhost_name
, &name_type2
, &return_ip
))
971 if (!strequal(name
, lmhost_name
))
974 if ((name_type2
!= -1) && (name_type
!= name_type2
))
977 *return_iplist
= SMB_REALLOC_ARRAY((*return_iplist
), struct ip_service
,
980 if ((*return_iplist
) == NULL
) {
982 DEBUG(3,("resolve_lmhosts: malloc fail !\n"));
986 (*return_iplist
)[*return_count
].ip
= return_ip
;
987 (*return_iplist
)[*return_count
].port
= PORT_NONE
;
990 /* we found something */
993 /* Multiple names only for DC lookup */
994 if (name_type
!= 0x1c)
1004 /********************************************************
1005 Resolve via "hosts" method.
1006 *********************************************************/
1008 static BOOL
resolve_hosts(const char *name
, int name_type
,
1009 struct ip_service
**return_iplist
, int *return_count
)
1012 * "host" means do a localhost, or dns lookup.
1016 if ( name_type
!= 0x20 && name_type
!= 0x0) {
1017 DEBUG(5, ("resolve_hosts: not appropriate for name type <0x%x>\n", name_type
));
1021 *return_iplist
= NULL
;
1024 DEBUG(3,("resolve_hosts: Attempting host lookup for name %s<0x%x>\n", name
, name_type
));
1026 if (((hp
= sys_gethostbyname(name
)) != NULL
) && (hp
->h_addr
!= NULL
)) {
1027 struct in_addr return_ip
;
1028 putip((char *)&return_ip
,(char *)hp
->h_addr
);
1029 *return_iplist
= SMB_MALLOC_P(struct ip_service
);
1030 if(*return_iplist
== NULL
) {
1031 DEBUG(3,("resolve_hosts: malloc fail !\n"));
1034 (*return_iplist
)->ip
= return_ip
;
1035 (*return_iplist
)->port
= PORT_NONE
;
1042 /********************************************************
1043 Resolve via "ADS" method.
1044 *********************************************************/
1046 static BOOL
resolve_ads(const char *name
, int name_type
,
1047 const char *sitename
,
1048 struct ip_service
**return_iplist
, int *return_count
)
1053 struct dns_rr_srv
*dcs
= NULL
;
1057 if ((name_type
!= 0x1c) && (name_type
!= KDC_NAME_TYPE
))
1060 DEBUG(5,("resolve_ads: Attempting to resolve DC's for %s using DNS\n",
1063 if ( (ctx
= talloc_init("resolve_ads")) == NULL
) {
1064 DEBUG(0,("resolve_ads: talloc_init() failed!\n"));
1068 if (name_type
== KDC_NAME_TYPE
) {
1069 status
= ads_dns_query_kdcs(ctx
, name
, sitename
, &dcs
, &numdcs
);
1071 status
= ads_dns_query_dcs(ctx
, name
, sitename
, &dcs
, &numdcs
);
1073 if ( !NT_STATUS_IS_OK( status
) ) {
1074 talloc_destroy(ctx
);
1078 for (i
=0;i
<numdcs
;i
++) {
1079 numaddrs
+= MAX(dcs
[i
].num_ips
,1);
1082 if ( (*return_iplist
= SMB_MALLOC_ARRAY(struct ip_service
, numaddrs
)) == NULL
) {
1083 DEBUG(0,("resolve_ads: malloc failed for %d entries\n", numaddrs
));
1084 talloc_destroy(ctx
);
1088 /* now unroll the list of IP addresses */
1093 while ( i
< numdcs
&& (*return_count
<numaddrs
) ) {
1094 struct ip_service
*r
= &(*return_iplist
)[*return_count
];
1096 r
->port
= dcs
[i
].port
;
1098 /* If we don't have an IP list for a name, lookup it up */
1100 if ( !dcs
[i
].ips
) {
1101 r
->ip
= *interpret_addr2(dcs
[i
].hostname
);
1105 /* use the IP addresses from the SRV sresponse */
1107 if ( j
>= dcs
[i
].num_ips
) {
1113 r
->ip
= dcs
[i
].ips
[j
];
1117 /* make sure it is a valid IP. I considered checking the negative
1118 connection cache, but this is the wrong place for it. Maybe only
1119 as a hac. After think about it, if all of the IP addresses retuend
1120 from DNS are dead, what hope does a netbios name lookup have?
1121 The standard reason for falling back to netbios lookups is that
1122 our DNS server doesn't know anything about the DC's -- jerry */
1124 if ( ! is_zero_ip(r
->ip
) )
1128 talloc_destroy(ctx
);
1132 /*******************************************************************
1133 Internal interface to resolve a name into an IP address.
1134 Use this function if the string is either an IP address, DNS
1135 or host name or NetBIOS name. This uses the name switch in the
1136 smb.conf to determine the order of name resolution.
1138 Added support for ip addr/port to support ADS ldap servers.
1139 the only place we currently care about the port is in the
1140 resolve_hosts() when looking up DC's via SRV RR entries in DNS
1141 **********************************************************************/
1143 BOOL
internal_resolve_name(const char *name
, int name_type
,
1144 const char *sitename
,
1145 struct ip_service
**return_iplist
,
1146 int *return_count
, const char *resolve_order
)
1148 pstring name_resolve_list
;
1151 BOOL allones
= (strcmp(name
,"255.255.255.255") == 0);
1152 BOOL allzeros
= (strcmp(name
,"0.0.0.0") == 0);
1153 BOOL is_address
= is_ipaddress(name
);
1154 BOOL result
= False
;
1157 *return_iplist
= NULL
;
1160 DEBUG(10, ("internal_resolve_name: looking up %s#%x (sitename %s)\n",
1161 name
, name_type
, sitename
? sitename
: NULL
));
1163 if (allzeros
|| allones
|| is_address
) {
1165 if ( (*return_iplist
= SMB_MALLOC_P(struct ip_service
)) == NULL
) {
1166 DEBUG(0,("internal_resolve_name: malloc fail !\n"));
1171 /* ignore the port here */
1172 (*return_iplist
)->port
= PORT_NONE
;
1174 /* if it's in the form of an IP address then get the lib to interpret it */
1175 if (((*return_iplist
)->ip
.s_addr
= inet_addr(name
)) == 0xFFFFFFFF ){
1176 DEBUG(1,("internal_resolve_name: inet_addr failed on %s\n", name
));
1177 SAFE_FREE(*return_iplist
);
1181 (*return_iplist
)->ip
.s_addr
= allones
? 0xFFFFFFFF : 0;
1187 /* Check name cache */
1189 if (namecache_fetch(name
, name_type
, return_iplist
, return_count
)) {
1190 /* This could be a negative response */
1191 return (*return_count
> 0);
1194 /* set the name resolution order */
1196 if ( strcmp( resolve_order
, "NULL") == 0 ) {
1197 DEBUG(8,("internal_resolve_name: all lookups disabled\n"));
1201 if ( !resolve_order
) {
1202 pstrcpy(name_resolve_list
, lp_name_resolve_order());
1204 pstrcpy(name_resolve_list
, resolve_order
);
1207 if ( !name_resolve_list
[0] ) {
1210 ptr
= name_resolve_list
;
1213 /* iterate through the name resolution backends */
1215 while (next_token(&ptr
, tok
, LIST_SEP
, sizeof(tok
))) {
1216 if((strequal(tok
, "host") || strequal(tok
, "hosts"))) {
1217 if (resolve_hosts(name
, name_type
, return_iplist
, return_count
)) {
1221 } else if(strequal( tok
, "kdc")) {
1222 /* deal with KDC_NAME_TYPE names here. This will result in a
1223 SRV record lookup */
1224 if (resolve_ads(name
, KDC_NAME_TYPE
, sitename
, return_iplist
, return_count
)) {
1226 /* Ensure we don't namecache this with the KDC port. */
1227 name_type
= KDC_NAME_TYPE
;
1230 } else if(strequal( tok
, "ads")) {
1231 /* deal with 0x1c names here. This will result in a
1232 SRV record lookup */
1233 if (resolve_ads(name
, name_type
, sitename
, return_iplist
, return_count
)) {
1237 } else if(strequal( tok
, "lmhosts")) {
1238 if (resolve_lmhosts(name
, name_type
, return_iplist
, return_count
)) {
1242 } else if(strequal( tok
, "wins")) {
1243 /* don't resolve 1D via WINS */
1244 if (name_type
!= 0x1D && resolve_wins(name
, name_type
, return_iplist
, return_count
)) {
1248 } else if(strequal( tok
, "bcast")) {
1249 if (name_resolve_bcast(name
, name_type
, return_iplist
, return_count
)) {
1254 DEBUG(0,("resolve_name: unknown name switch type %s\n", tok
));
1258 /* All of the resolve_* functions above have returned false. */
1260 SAFE_FREE(*return_iplist
);
1267 /* Remove duplicate entries. Some queries, notably #1c (domain
1268 controllers) return the PDC in iplist[0] and then all domain
1269 controllers including the PDC in iplist[1..n]. Iterating over
1270 the iplist when the PDC is down will cause two sets of timeouts. */
1272 if ( *return_count
) {
1273 *return_count
= remove_duplicate_addrs2( *return_iplist
, *return_count
);
1276 /* Save in name cache */
1277 if ( DEBUGLEVEL
>= 100 ) {
1278 for (i
= 0; i
< *return_count
&& DEBUGLEVEL
== 100; i
++)
1279 DEBUG(100, ("Storing name %s of type %d (%s:%d)\n", name
,
1280 name_type
, inet_ntoa((*return_iplist
)[i
].ip
), (*return_iplist
)[i
].port
));
1283 namecache_store(name
, name_type
, *return_count
, *return_iplist
);
1285 /* Display some debugging info */
1287 if ( DEBUGLEVEL
>= 10 ) {
1288 DEBUG(10, ("internal_resolve_name: returning %d addresses: ", *return_count
));
1290 for (i
= 0; i
< *return_count
; i
++) {
1291 DEBUGADD(10, ("%s:%d ", inet_ntoa((*return_iplist
)[i
].ip
), (*return_iplist
)[i
].port
));
1299 /********************************************************
1300 Internal interface to resolve a name into one IP address.
1301 Use this function if the string is either an IP address, DNS
1302 or host name or NetBIOS name. This uses the name switch in the
1303 smb.conf to determine the order of name resolution.
1304 *********************************************************/
1306 BOOL
resolve_name(const char *name
, struct in_addr
*return_ip
, int name_type
)
1308 struct ip_service
*ip_list
= NULL
;
1309 char *sitename
= sitename_fetch(lp_realm()); /* wild guess */
1312 if (is_ipaddress(name
)) {
1313 *return_ip
= *interpret_addr2(name
);
1314 SAFE_FREE(sitename
);
1318 if (internal_resolve_name(name
, name_type
, sitename
, &ip_list
, &count
, lp_name_resolve_order())) {
1321 /* only return valid addresses for TCP connections */
1322 for (i
=0; i
<count
; i
++) {
1323 char *ip_str
= inet_ntoa(ip_list
[i
].ip
);
1325 strcmp(ip_str
, "255.255.255.255") != 0 &&
1326 strcmp(ip_str
, "0.0.0.0") != 0)
1328 *return_ip
= ip_list
[i
].ip
;
1330 SAFE_FREE(sitename
);
1337 SAFE_FREE(sitename
);
1341 /********************************************************
1342 Find the IP address of the master browser or DMB for a workgroup.
1343 *********************************************************/
1345 BOOL
find_master_ip(const char *group
, struct in_addr
*master_ip
)
1347 struct ip_service
*ip_list
= NULL
;
1350 if (lp_disable_netbios()) {
1351 DEBUG(5,("find_master_ip(%s): netbios is disabled\n", group
));
1355 if (internal_resolve_name(group
, 0x1D, NULL
, &ip_list
, &count
, lp_name_resolve_order())) {
1356 *master_ip
= ip_list
[0].ip
;
1360 if(internal_resolve_name(group
, 0x1B, NULL
, &ip_list
, &count
, lp_name_resolve_order())) {
1361 *master_ip
= ip_list
[0].ip
;
1370 /********************************************************
1371 Get the IP address list of the primary domain controller
1373 *********************************************************/
1375 BOOL
get_pdc_ip(const char *domain
, struct in_addr
*ip
)
1377 struct ip_service
*ip_list
= NULL
;
1380 /* Look up #1B name */
1382 if (!internal_resolve_name(domain
, 0x1b, NULL
, &ip_list
, &count
, lp_name_resolve_order())) {
1386 /* if we get more than 1 IP back we have to assume it is a
1387 multi-homed PDC and not a mess up */
1390 DEBUG(6,("get_pdc_ip: PDC has %d IP addresses!\n", count
));
1391 sort_ip_list2( ip_list
, count
);
1394 *ip
= ip_list
[0].ip
;
1401 /* Private enum type for lookups. */
1403 enum dc_lookup_type
{ DC_NORMAL_LOOKUP
, DC_ADS_ONLY
, DC_KDC_ONLY
};
1405 /********************************************************
1406 Get the IP address list of the domain controllers for
1408 *********************************************************/
1410 static NTSTATUS
get_dc_list(const char *domain
, const char *sitename
, struct ip_service
**ip_list
,
1411 int *count
, enum dc_lookup_type lookup_type
, int *ordered
)
1413 fstring resolve_order
;
1414 char *saf_servername
;
1420 int num_addresses
= 0;
1421 int local_count
, i
, j
;
1422 struct ip_service
*return_iplist
= NULL
;
1423 struct ip_service
*auto_ip_list
= NULL
;
1424 BOOL done_auto_lookup
= False
;
1429 /* if we are restricted to solely using DNS for looking
1430 up a domain controller, make sure that host lookups
1431 are enabled for the 'name resolve order'. If host lookups
1432 are disabled and ads_only is True, then set the string to
1435 fstrcpy( resolve_order
, lp_name_resolve_order() );
1436 strlower_m( resolve_order
);
1437 if ( lookup_type
== DC_ADS_ONLY
) {
1438 if ( strstr( resolve_order
, "host" ) ) {
1439 fstrcpy( resolve_order
, "ads" );
1441 /* DNS SRV lookups used by the ads resolver
1442 are already sorted by priority and weight */
1445 fstrcpy( resolve_order
, "NULL" );
1447 } else if (lookup_type
== DC_KDC_ONLY
) {
1448 /* DNS SRV lookups used by the ads/kdc resolver
1449 are already sorted by priority and weight */
1451 fstrcpy( resolve_order
, "kdc" );
1454 /* fetch the server we have affinity for. Add the
1455 'password server' list to a search for our domain controllers */
1457 saf_servername
= saf_fetch( domain
);
1459 if ( strequal(domain
, lp_workgroup()) || strequal(domain
, lp_realm()) ) {
1460 pstr_sprintf( pserver
, "%s, %s",
1461 saf_servername
? saf_servername
: "",
1462 lp_passwordserver() );
1464 pstr_sprintf( pserver
, "%s, *",
1465 saf_servername
? saf_servername
: "" );
1468 SAFE_FREE( saf_servername
);
1470 /* if we are starting from scratch, just lookup DOMAIN<0x1c> */
1473 DEBUG(10,("get_dc_list: no preferred domain controllers.\n"));
1474 /* TODO: change return type of internal_resolve_name to
1476 if (internal_resolve_name(domain
, 0x1C, sitename
, ip_list
, count
,
1478 return NT_STATUS_OK
;
1480 return NT_STATUS_NO_LOGON_SERVERS
;
1484 DEBUG(3,("get_dc_list: preferred server list: \"%s\"\n", pserver
));
1487 * if '*' appears in the "password server" list then add
1488 * an auto lookup to the list of manually configured
1489 * DC's. If any DC is listed by name, then the list should be
1490 * considered to be ordered
1494 while (next_token(&p
,name
,LIST_SEP
,sizeof(name
))) {
1495 if (strequal(name
, "*")) {
1496 if (internal_resolve_name(domain
, 0x1C, sitename
, &auto_ip_list
,
1497 &auto_count
, resolve_order
))
1498 num_addresses
+= auto_count
;
1499 done_auto_lookup
= True
;
1500 DEBUG(8,("Adding %d DC's from auto lookup\n", auto_count
));
1506 /* if we have no addresses and haven't done the auto lookup, then
1507 just return the list of DC's. Or maybe we just failed. */
1509 if ( (num_addresses
== 0) ) {
1510 if ( done_auto_lookup
) {
1511 DEBUG(4,("get_dc_list: no servers found\n"));
1512 SAFE_FREE(auto_ip_list
);
1513 return NT_STATUS_NO_LOGON_SERVERS
;
1515 if (internal_resolve_name(domain
, 0x1C, sitename
, ip_list
, count
,
1517 return NT_STATUS_OK
;
1519 return NT_STATUS_NO_LOGON_SERVERS
;
1523 if ( (return_iplist
= SMB_MALLOC_ARRAY(struct ip_service
, num_addresses
)) == NULL
) {
1524 DEBUG(3,("get_dc_list: malloc fail !\n"));
1525 SAFE_FREE(auto_ip_list
);
1526 return NT_STATUS_NO_MEMORY
;
1532 /* fill in the return list now with real IP's */
1534 while ( (local_count
<num_addresses
) && next_token(&p
,name
,LIST_SEP
,sizeof(name
)) ) {
1535 struct in_addr name_ip
;
1537 /* copy any addersses from the auto lookup */
1539 if ( strequal(name
, "*") ) {
1540 for ( j
=0; j
<auto_count
; j
++ ) {
1541 /* Check for and don't copy any known bad DC IP's. */
1542 if(!NT_STATUS_IS_OK(check_negative_conn_cache(domain
,
1543 inet_ntoa(auto_ip_list
[j
].ip
)))) {
1544 DEBUG(5,("get_dc_list: negative entry %s removed from DC list\n",
1545 inet_ntoa(auto_ip_list
[j
].ip
) ));
1548 return_iplist
[local_count
].ip
= auto_ip_list
[j
].ip
;
1549 return_iplist
[local_count
].port
= auto_ip_list
[j
].port
;
1556 /* added support for address:port syntax for ads (not that I think
1557 anyone will ever run the LDAP server in an AD domain on something
1558 other than port 389 */
1560 port
= (lp_security() == SEC_ADS
) ? LDAP_PORT
: PORT_NONE
;
1561 if ( (port_str
=strchr(name
, ':')) != NULL
) {
1564 port
= atoi( port_str
);
1567 /* explicit lookup; resolve_name() will handle names & IP addresses */
1568 if ( resolve_name( name
, &name_ip
, 0x20 ) ) {
1570 /* Check for and don't copy any known bad DC IP's. */
1571 if( !NT_STATUS_IS_OK(check_negative_conn_cache(domain
, inet_ntoa(name_ip
))) ) {
1572 DEBUG(5,("get_dc_list: negative entry %s removed from DC list\n",name
));
1576 return_iplist
[local_count
].ip
= name_ip
;
1577 return_iplist
[local_count
].port
= port
;
1583 SAFE_FREE(auto_ip_list
);
1585 /* need to remove duplicates in the list if we have any
1586 explicit password servers */
1588 if ( local_count
) {
1589 local_count
= remove_duplicate_addrs2( return_iplist
, local_count
);
1592 if ( DEBUGLEVEL
>= 4 ) {
1593 DEBUG(4,("get_dc_list: returning %d ip addresses in an %sordered list\n", local_count
,
1594 *ordered
? "":"un"));
1595 DEBUG(4,("get_dc_list: "));
1596 for ( i
=0; i
<local_count
; i
++ )
1597 DEBUGADD(4,("%s:%d ", inet_ntoa(return_iplist
[i
].ip
), return_iplist
[i
].port
));
1601 *ip_list
= return_iplist
;
1602 *count
= local_count
;
1604 return ( *count
!= 0 ? NT_STATUS_OK
: NT_STATUS_NO_LOGON_SERVERS
);
1607 /*********************************************************************
1608 Small wrapper function to get the DC list and sort it if neccessary.
1609 *********************************************************************/
1611 NTSTATUS
get_sorted_dc_list( const char *domain
, const char *sitename
, struct ip_service
**ip_list
, int *count
, BOOL ads_only
)
1615 enum dc_lookup_type lookup_type
= DC_NORMAL_LOOKUP
;
1617 DEBUG(8,("get_sorted_dc_list: attempting lookup for name %s (sitename %s) "
1620 sitename
? sitename
: "NULL",
1621 (ads_only
? "ads" : lp_name_resolve_order())));
1624 lookup_type
= DC_ADS_ONLY
;
1627 status
= get_dc_list(domain
, sitename
, ip_list
, count
, lookup_type
, &ordered
);
1628 if (!NT_STATUS_IS_OK(status
)) {
1632 /* only sort if we don't already have an ordered list */
1634 sort_ip_list2( *ip_list
, *count
);
1637 return NT_STATUS_OK
;
1640 /*********************************************************************
1641 Get the KDC list - re-use all the logic in get_dc_list.
1642 *********************************************************************/
1644 NTSTATUS
get_kdc_list( const char *realm
, const char *sitename
, struct ip_service
**ip_list
, int *count
)
1652 status
= get_dc_list(realm
, sitename
, ip_list
, count
, DC_KDC_ONLY
, &ordered
);
1654 if (!NT_STATUS_IS_OK(status
)) {
1658 /* only sort if we don't already have an ordered list */
1660 sort_ip_list2( *ip_list
, *count
);
1663 return NT_STATUS_OK
;