2 Unix SMB/Netbios implementation.
4 NBT netbios routines and daemon - version 2
5 Copyright (C) Andrew Tridgell 1994-1996
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 Module name: nameservreply.c
25 14 jan 96: lkcl@pires.co.uk
26 added multiple workgroup domain master support
28 04 jul 96: lkcl@pires.co.uk
29 created module nameservreply containing NetBIOS reply functions
37 extern int DEBUGLEVEL
;
39 extern struct in_addr ipgrp
;
42 /****************************************************************************
43 add a netbios entry. respond to the (possibly new) owner.
44 **************************************************************************/
45 void add_name_respond(struct subnet_record
*d
, int fd
, struct in_addr from_ip
,
47 struct nmb_name
*name
,
48 int nb_flags
, int ttl
, struct in_addr register_ip
,
49 BOOL new_owner
, struct in_addr reply_to_ip
)
51 /* register the old or the new owners' ip */
52 add_netbios_entry(d
,name
->name
,name
->name_type
,
53 nb_flags
,ttl
,REGISTER
,register_ip
,False
,True
);
55 /* reply yes or no to the host that requested the name */
56 send_name_response(fd
,from_ip
, response_id
, NMB_REG
,
58 name
, nb_flags
, ttl
, reply_to_ip
);
61 /****************************************************************************
62 send a registration / release response: pos/neg
63 **************************************************************************/
64 void send_name_response(int fd
, struct in_addr from_ip
,
65 int name_trn_id
, int opcode
, BOOL success
, BOOL recurse
,
66 struct nmb_name
*reply_name
, int nb_flags
, int ttl
,
70 struct packet_struct p
;
76 /* NEGATIVE RESPONSE */
79 else if (opcode
== NMB_REG
&& recurse
== False
)
81 /* END-NODE CHALLENGE REGISTRATION RESPONSE */
87 putip(&rdata
[2],(char *)&ip
);
92 p
.timestamp
= time(NULL
);
93 p
.packet_type
= NMB_PACKET
;
95 reply_netbios_packet(&p
,name_trn_id
,
96 rcode
,opcode
,opcode
,recurse
,
97 reply_name
, 0x20, 0x1,
103 /****************************************************************************
104 reply to a name release
105 ****************************************************************************/
106 void reply_name_release(struct packet_struct
*p
)
108 struct nmb_packet
*nmb
= &p
->packet
.nmb
;
110 int nb_flags
= nmb
->additional
->rdata
[0];
111 BOOL bcast
= nmb
->header
.nm_flags
.bcast
;
112 struct name_record
*n
;
113 struct subnet_record
*d
= NULL
;
115 BOOL success
= False
;
117 putip((char *)&ip
,&nmb
->additional
->rdata
[2]);
119 DEBUG(3,("Name release on name %s\n",
120 namestr(&nmb
->question
.question_name
)));
122 if (!(d
= find_req_subnet(p
->ip
, bcast
)))
124 DEBUG(3,("response packet: bcast %s not known\n",
130 search
&= FIND_LOCAL
;
134 n
= find_name_search(&d
, &nmb
->question
.question_name
,
137 /* XXXX under what conditions should we reject the removal?? */
138 if (n
&& n
->ip_flgs
[0].nb_flags
== nb_flags
)
148 /* Send a NAME RELEASE RESPONSE (pos/neg) see rfc1002.txt 4.2.10-11 */
149 send_name_response(p
->fd
,p
->ip
, nmb
->header
.name_trn_id
, NMB_REL
,
151 &nmb
->question
.question_name
, nb_flags
, 0, ip
);
155 /****************************************************************************
156 reply to a reg request
157 **************************************************************************/
158 void reply_name_reg(struct packet_struct
*p
)
160 struct nmb_packet
*nmb
= &p
->packet
.nmb
;
161 struct nmb_name
*question
= &nmb
->question
.question_name
;
163 struct nmb_name
*reply_name
= question
;
165 char *qname
= question
->name
;
166 int qname_type
= question
->name_type
;
168 BOOL bcast
= nmb
->header
.nm_flags
.bcast
;
170 int ttl
= GET_TTL(nmb
->additional
->ttl
);
171 int nb_flags
= nmb
->additional
->rdata
[0];
172 BOOL group
= NAME_GROUP(nb_flags
);
174 struct subnet_record
*d
= NULL
;
175 struct name_record
*n
= NULL
;
178 BOOL secured_redirect
= False
;
180 struct in_addr ip
, from_ip
;
183 putip((char *)&from_ip
,&nmb
->additional
->rdata
[2]);
186 DEBUG(3,("Name registration for name %s at %s\n",
187 namestr(question
),inet_ntoa(ip
)));
191 /* apparently we should return 255.255.255.255 for group queries
196 if (!(d
= find_req_subnet(p
->ip
, bcast
)))
198 DEBUG(3,("response packet: bcast %s not known\n",
204 search
&= FIND_LOCAL
;
208 /* see if the name already exists */
209 n
= find_name_search(&d
, question
, search
, from_ip
);
213 if (!group
) /* unique names */
215 if (n
->source
== SELF
|| NAME_GROUP(n
->ip_flgs
[0].nb_flags
))
217 /* no-one can register one of samba's names, nor can they
218 register a name that's a group name as a unique name */
222 else if(!ip_equal(ip
, n
->ip_flgs
[0].ip
))
224 /* XXXX rfc1001.txt says:
225 * if we are doing secured WINS, we must send a Wait-Acknowledge
226 * packet (WACK) to the person who wants the name, then do a
227 * name query on the person who currently owns the unique name.
228 * if the current owner still says they own it, the person who wants
229 * the name can't have it. if they do not, or are not alive, they can.
232 secured_redirect
= True
;
234 reply_name
= &n
->name
;
238 n
->ip_flgs
[0].ip
= ip
;
239 n
->death_time
= ttl
?p
->timestamp
+ttl
*3:0;
240 DEBUG(3,("%s owner: %s\n",namestr(&n
->name
),inet_ntoa(n
->ip_flgs
[0].ip
)));
245 /* refresh the name */
246 if (n
->source
!= SELF
)
248 n
->death_time
= ttl
?p
->timestamp
+ ttl
*3:0;
252 /* XXXX bug reported by terryt@ren.pc.athabascau.ca */
253 /* names that people have checked for and not found get DNSFAILed.
254 we need to update the name record if someone then registers */
256 if (n
->source
== DNSFAIL
)
257 n
->source
= REGISTER
;
262 /* add the name to our name/subnet, or WINS, database */
263 n
= add_netbios_entry(d
,qname
,qname_type
,nb_flags
,ttl
,REGISTER
,ip
,
267 /* if samba owns a unique name on a subnet, then it must respond and
268 disallow the attempted registration. if the registration is
269 successful by broadcast, only then is there no need to respond
270 (implicit registration: see rfc1001.txt 15.2.1).
273 if (bcast
&& success
) return;
275 if (secured_redirect
)
279 /* XXXX i am confused. RSVAL or SSVAL? assume NMB byte ordering */
280 RSSVAL(rdata
,0,(nmb
->header
.opcode
&0xf) + ((nb_flags
&0xff) << 4));
282 /* XXXX mistake in rfc1002.txt? 4.2.16: NULL is 0xa see 4.2.1.3
283 type = 0x0a; see rfc1002.txt 4.2.1.3
284 class = 0x01; see rfc1002.txt 4.2.16
287 /* send WAIT ACKNOWLEDGEMENT see rfc1002.txt 4.2.16 */
288 reply_netbios_packet(p
,nmb
->header
.name_trn_id
,
289 0,NMB_WAIT_ACK
,NMB_WAIT_ACK
,False
,
290 reply_name
, 0x0a, 0x01,
291 15*1000, /* 15 seconds long enough to wait? */
294 /* initiate some enquiries to the current owner. */
295 queue_netbios_packet(d
,ClientNMB
,NMB_QUERY
,
296 NAME_REGISTER_CHALLENGE
,
297 reply_name
->name
,reply_name
->name_type
,
298 nb_flags
,0,0,NULL
,NULL
,
299 False
, False
, n
->ip_flgs
[0].ip
, p
->ip
);
303 /* Send a NAME REGISTRATION RESPONSE (pos/neg) see rfc1002.txt 4.2.13-14
304 or an END-NODE CHALLENGE REGISTRATION RESPONSE see rfc1002.txt 4.2.7
307 send_name_response(p
->fd
,p
->ip
, nmb
->header
.name_trn_id
, NMB_REG
,
309 reply_name
, nb_flags
, ttl
, ip
);
313 /* this is used to sort names for a name status into a sensible order
314 we put our own names first, then in alphabetical order */
315 static int status_compare(char *n1
,char *n2
)
317 extern pstring myname
;
320 /* its a bit tricky because the names are space padded */
321 for (l1
=0;l1
<15 && n1
[l1
] && n1
[l1
] != ' ';l1
++) ;
322 for (l2
=0;l2
<15 && n2
[l2
] && n2
[l2
] != ' ';l2
++) ;
325 if ((l1
==l3
) && strncmp(n1
,myname
,l3
) == 0 &&
326 (l2
!=l3
|| strncmp(n2
,myname
,l3
) != 0))
329 if ((l2
==l3
) && strncmp(n2
,myname
,l3
) == 0 &&
330 (l1
!=l3
|| strncmp(n1
,myname
,l3
) != 0))
333 return memcmp(n1
,n2
,18);
337 /****************************************************************************
338 reply to a name status query
340 combine the list of the local interface on which the query was made with
341 the names registered via wins.
342 ****************************************************************************/
343 void reply_name_status(struct packet_struct
*p
)
345 struct nmb_packet
*nmb
= &p
->packet
.nmb
;
346 char *qname
= nmb
->question
.question_name
.name
;
347 int ques_type
= nmb
->question
.question_name
.name_type
;
348 char rdata
[MAX_DGRAM_SIZE
];
349 char *countptr
, *buf
, *bufend
, *buf0
;
351 struct name_record
*n
;
352 struct subnet_record
*d
= NULL
;
353 int search
= FIND_SELF
| FIND_WINS
| FIND_LOCAL
;
355 /* NOTE: we always treat a name status lookup as a bcast */
356 if (!(d
= find_req_subnet(p
->ip
, True
)))
358 DEBUG(3,("Name status req: bcast %s not known\n",
363 DEBUG(3,("Name status for name %s %s\n",
364 namestr(&nmb
->question
.question_name
),
367 n
= find_name_search(&d
, &nmb
->question
.question_name
,
372 /* XXXX hack, we should calculate exactly how many will fit */
373 bufend
= &rdata
[MAX_DGRAM_SIZE
] - 18;
374 countptr
= buf
= rdata
;
384 if (n
->source
== SELF
)
386 int name_type
= n
->name
.name_type
;
388 /* check if we want to exclude other workgroup names
389 from the response. if we don't exclude them, windows clients
390 get confused and will respond with an error for NET VIEW */
392 if (!strequal(n
->name
.name
,"*") &&
393 !strequal(n
->name
.name
,"__SAMBA__") &&
394 (name_type
< 0x1b || name_type
> 0x20 ||
395 ques_type
< 0x1b || ques_type
> 0x20 ||
396 strequal(qname
, n
->name
.name
)))
398 /* start with first bit of putting info in buffer: the name */
400 sprintf(buf
,"%-15.15s",n
->name
.name
);
403 /* put name type and netbios flags in buffer */
405 buf
[16] = n
->ip_flgs
[0].nb_flags
;
413 /* remove duplicate names */
414 qsort(buf0
,names_added
,18,QSORT_CAST status_compare
);
416 for (i
=1;i
<names_added
;i
++) {
417 if (memcmp(buf0
+ 18*i
,buf0
+ 18*(i
-1),16) == 0) {
419 if (names_added
== i
) break;
420 memmove(buf0
+ 18*i
,buf0
+ 18*(i
+1),18*(names_added
-i
));
425 buf
= buf0
+ 18*names_added
;
431 /* end of this name list: add wins names too? */
432 struct subnet_record
*w_d
;
434 if (!(w_d
= find_subnet(ipgrp
))) break;
439 n
= d
->namelist
; /* start on the wins name list */
445 SCVAL(countptr
,0,names_added
);
447 /* XXXXXXX we should fill in more fields of the statistics structure */
450 extern int num_good_sends
,num_good_receives
;
451 SIVAL(buf
,20,num_good_sends
);
452 SIVAL(buf
,24,num_good_receives
);
457 /* Send a POSITIVE NAME STATUS RESPONSE */
458 reply_netbios_packet(p
,nmb
->header
.name_trn_id
,
460 &nmb
->question
.question_name
,
461 nmb
->question
.question_type
,
462 nmb
->question
.question_class
,
464 rdata
,PTR_DIFF(buf
,rdata
));
468 /***************************************************************************
469 reply to a name query.
471 with broadcast name queries:
473 - only reply if the query is for one of YOUR names. all other machines on
474 the network will be doing the same thing (that is, only replying to a
475 broadcast query if they own it)
476 NOTE: broadcast name queries should only be sent out by a machine
477 if they HAVEN'T been configured to use WINS. this is generally bad news
478 in a wide area tcp/ip network and should be rectified by the systems
479 administrator. USE WINS! :-)
480 - the exception to this is if the query is for a Primary Domain Controller
481 type name (0x1b), in which case, a reply is sent.
483 - NEVER send a negative response to a broadcast query. no-one else will!
485 with directed name queries:
487 - if you are the WINS server, you are expected to respond with either
488 a negative response, a positive response, or a wait-for-acknowledgement
489 packet, and then later on a pos/neg response.
491 ****************************************************************************/
492 void reply_name_query(struct packet_struct
*p
)
494 struct nmb_packet
*nmb
= &p
->packet
.nmb
;
495 struct nmb_name
*question
= &nmb
->question
.question_name
;
496 int name_type
= question
->name_type
;
497 BOOL bcast
= nmb
->header
.nm_flags
.bcast
;
501 struct in_addr retip
;
503 struct subnet_record
*d
= NULL
;
505 struct name_record
*n
= NULL
;
507 /* directed queries are for WINS server: broadcasts are local SELF queries.
508 the exception is Domain Master names. */
510 int search
= bcast
? FIND_LOCAL
| FIND_WINS
: FIND_WINS
;
512 if (search
& FIND_LOCAL
)
514 if (!(d
= find_req_subnet(p
->ip
, bcast
)))
516 DEBUG(3,("name query: bcast %s not known\n",
523 if (!(d
= find_subnet(ipgrp
)))
525 DEBUG(3,("name query: wins search %s not known\n",
531 DEBUG(3,("Name query "));
535 /* eh? no criterion for searching database. help! */
539 if (!bcast
&& name_type
== 0x1d)
541 /* see WINS manager HELP - 'How WINS Handles Special Names' */
542 /* a WINS query (unicasted) for a 0x1d name must always return False */
548 /* look up the name in the cache */
549 n
= find_name_search(&d
, question
, search
, p
->ip
);
551 /* it is a name that already failed DNS lookup or it's expired */
552 if (n
->source
== DNSFAIL
||
553 (n
->death_time
&& n
->death_time
< p
->timestamp
))
558 /* do we want to do dns lookups? */
559 /* XXXX this DELAYS nmbd while it does a search. not a good idea
560 but there's no pleasant alternative. phil@hands.com suggested
561 making the name a full DNS name, which would succeed / fail
564 if (success
&& !n
&& (lp_wins_proxy() || !bcast
))
566 n
= dns_name_search(question
, p
->timestamp
, search
);
570 if (!n
) success
= False
;
574 if (bcast
&& n
->source
!= SELF
&& name_type
!= 0x1b)
576 /* don't respond to broadcast queries unless the query is for
577 a name we own or it is for a Primary Domain Controller name */
579 if (!lp_wins_proxy() ||
580 same_net(p
->ip
,n
->ip_flgs
[0].ip
,*iface_nmask(p
->ip
)))
582 /* never reply with a negative response to broadcast queries */
587 /* name is directed query, or it's self, or it's a Domain Master type
588 name, or we're replying on behalf of a caller because they are on a
589 different subnet and cannot hear the broadcast. XXXX lp_wins_proxy
590 should be switched off in environments where broadcasts are forwarded
593 /* XXXX note: for proxy servers, we should forward the query on to
594 another WINS server if the name is not in our database, or we are
595 not a WINS server ourselves
597 ttl
= n
->death_time
? n
->death_time
- p
->timestamp
: GET_TTL(0);
598 retip
= n
->ip_flgs
[0].ip
;
599 nb_flags
= n
->ip_flgs
[0].nb_flags
;
602 if (!success
&& bcast
) return; /* never reply negative response to bcasts */
604 /* if the IP is 0 then substitute my IP */
605 if (zero_ip(retip
)) retip
= *iface_ip(p
->ip
);
610 DEBUG(3,("OK %s\n",inet_ntoa(retip
)));
615 DEBUG(3,("UNKNOWN\n"));
622 putip(&rdata
[2],(char *)&retip
);
625 reply_netbios_packet(p
,nmb
->header
.name_trn_id
,
626 rcode
,NMB_QUERY
,0,True
,
627 &nmb
->question
.question_name
,
628 nmb
->question
.question_type
,
629 nmb
->question
.question_class
,
631 rdata
, success
? 6 : 0);