source: trunk-3.0/source/nmbd/nmbd_namerelease.c@ 102

Last change on this file since 102 was 1, checked in by Paul Smedley, 18 years ago

Initial code import
File size: 8.0 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 NBT netbios routines and daemon - version 2
4 Copyright (C) Andrew Tridgell 1994-1998
5 Copyright (C) Luke Kenneth Casson Leighton 1994-1998
6 Copyright (C) Jeremy Allison 1994-1998
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21
22*/
23
24#include "includes.h"
25
26/****************************************************************************
27 Deal with a response packet when releasing one of our names.
28****************************************************************************/
29
30static void release_name_response(struct subnet_record *subrec,
31 struct response_record *rrec, struct packet_struct *p)
32{
33 /*
34 * If we are releasing broadcast, then getting a response is an
35 * error. If we are releasing unicast, then we expect to get a response.
36 */
37 struct nmb_packet *nmb = &p->packet.nmb;
38 BOOL bcast = nmb->header.nm_flags.bcast;
39 BOOL success = True;
40 struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
41 struct nmb_name *answer_name = &nmb->answers->rr_name;
42 struct in_addr released_ip;
43
44 /* Sanity check. Ensure that the answer name in the incoming packet is the
45 same as the requested name in the outgoing packet. */
46 if (!nmb_name_equal(question_name, answer_name)) {
47 DEBUG(0,("release_name_response: Answer name %s differs from question name %s.\n",
48 nmb_namestr(answer_name), nmb_namestr(question_name)));
49 return;
50 }
51
52 if (bcast) {
53 /* Someone sent a response to a bcast release? ignore it. */
54 return;
55 }
56
57 /* Unicast - check to see if the response allows us to release the name. */
58 if (nmb->header.rcode != 0) {
59 /* Error code - we were told not to release the name ! What now ! */
60 success = False;
61
62 DEBUG(0,("release_name_response: WINS server at IP %s rejected our \
63name release of name %s with error code %d.\n",
64 inet_ntoa(p->ip),
65 nmb_namestr(answer_name), nmb->header.rcode));
66 } else if (nmb->header.opcode == NMB_WACK_OPCODE) {
67 /* WINS server is telling us to wait. Pretend we didn't get
68 the response but don't send out any more release requests. */
69
70 DEBUG(5,("release_name_response: WACK from WINS server %s in releasing \
71name %s on subnet %s.\n",
72 inet_ntoa(p->ip), nmb_namestr(answer_name), subrec->subnet_name));
73
74 rrec->repeat_count = 0;
75 /* How long we should wait for. */
76 rrec->repeat_time = p->timestamp + nmb->answers->ttl;
77 rrec->num_msgs--;
78 return;
79 }
80
81 DEBUG(5,("release_name_response: %s in releasing name %s on subnet %s.\n",
82 success ? "success" : "failure", nmb_namestr(answer_name), subrec->subnet_name));
83 if (success) {
84 putip((char*)&released_ip ,&nmb->answers->rdata[2]);
85
86 if(rrec->success_fn)
87 (*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, answer_name, released_ip);
88 standard_success_release( subrec, rrec->userdata, answer_name, released_ip);
89 } else {
90 /* We have no standard_fail_release - maybe we should add one ? */
91 if (rrec->fail_fn) {
92 (*(release_name_fail_function)rrec->fail_fn)(subrec, rrec, answer_name);
93 }
94 }
95
96 remove_response_record(subrec, rrec);
97}
98
99/****************************************************************************
100 Deal with a timeout when releasing one of our names.
101****************************************************************************/
102
103static void release_name_timeout_response(struct subnet_record *subrec,
104 struct response_record *rrec)
105{
106 /* a release is *always* considered to be successful when it
107 times out. This doesn't cause problems as if a WINS server
108 doesn't respond and someone else wants the name then the
109 normal WACK/name query from the WINS server will cope */
110 struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
111 BOOL bcast = sent_nmb->header.nm_flags.bcast;
112 struct nmb_name *question_name = &sent_nmb->question.question_name;
113 struct in_addr released_ip;
114
115 /* Get the ip address we were trying to release. */
116 putip((char*)&released_ip ,&sent_nmb->additional->rdata[2]);
117
118 if (!bcast) {
119 /* mark the WINS server temporarily dead */
120 wins_srv_died(rrec->packet->ip, released_ip);
121 }
122
123 DEBUG(5,("release_name_timeout_response: success in releasing name %s on subnet %s.\n",
124 nmb_namestr(question_name), subrec->subnet_name));
125
126 if (rrec->success_fn) {
127 (*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, question_name, released_ip);
128 }
129
130 standard_success_release( subrec, rrec->userdata, question_name, released_ip);
131 remove_response_record(subrec, rrec);
132}
133
134
135/*
136 when releasing a name with WINS we need to send the release to each of
137 the WINS groups
138*/
139static void wins_release_name(struct name_record *namerec,
140 release_name_success_function success_fn,
141 release_name_fail_function fail_fn,
142 struct userdata_struct *userdata)
143{
144 int t, i;
145 char **wins_tags;
146
147 /* get the list of wins tags - we try to release for each of them */
148 wins_tags = wins_srv_tags();
149
150 for (t=0;wins_tags && wins_tags[t]; t++) {
151 for (i = 0; i < namerec->data.num_ips; i++) {
152 struct in_addr wins_ip = wins_srv_ip_tag(wins_tags[t], namerec->data.ip[i]);
153
154 BOOL last_one = ((i==namerec->data.num_ips - 1) && !wins_tags[t+1]);
155 if (queue_release_name(unicast_subnet,
156 release_name_response,
157 release_name_timeout_response,
158 last_one?success_fn : NULL,
159 last_one? fail_fn : NULL,
160 last_one? userdata : NULL,
161 &namerec->name,
162 namerec->data.nb_flags,
163 namerec->data.ip[i],
164 wins_ip) == NULL) {
165 DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
166 nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
167 }
168 }
169 }
170
171 wins_srv_tags_free(wins_tags);
172}
173
174
175/****************************************************************************
176 Try and release one of our names.
177****************************************************************************/
178
179void release_name(struct subnet_record *subrec, struct name_record *namerec,
180 release_name_success_function success_fn,
181 release_name_fail_function fail_fn,
182 struct userdata_struct *userdata)
183{
184 int i;
185
186 /* Ensure it's a SELF name, and in the ACTIVE state. */
187 if ((namerec->data.source != SELF_NAME) || !NAME_IS_ACTIVE(namerec)) {
188 DEBUG(0,("release_name: Cannot release name %s from subnet %s. Source was %d \n",
189 nmb_namestr(&namerec->name), subrec->subnet_name, namerec->data.source));
190 return;
191 }
192
193 /* Set the name into the deregistering state. */
194 namerec->data.nb_flags |= NB_DEREG;
195
196 /* wins releases are a bit different */
197 if (subrec == unicast_subnet) {
198 wins_release_name(namerec, success_fn, fail_fn, userdata);
199 return;
200 }
201
202 /*
203 * Go through and release the name for all known ip addresses.
204 * Only call the success/fail function on the last one (it should
205 * only be done once).
206 */
207 for (i = 0; i < namerec->data.num_ips; i++) {
208 if (queue_release_name(subrec,
209 release_name_response,
210 release_name_timeout_response,
211 (i == (namerec->data.num_ips - 1)) ? success_fn : NULL,
212 (i == (namerec->data.num_ips - 1)) ? fail_fn : NULL,
213 (i == (namerec->data.num_ips - 1)) ? userdata : NULL,
214 &namerec->name,
215 namerec->data.nb_flags,
216 namerec->data.ip[i],
217 subrec->bcast_ip) == NULL) {
218 DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
219 nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
220 }
221 }
222}
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