source: branches/samba-3.3.x/source/nmbd/nmbd_namerelease.c

Last change on this file was 206, checked in by Herwig Bauernfeind, 16 years ago

Import Samba 3.3 branch at 3.0.0 level (psmedley's port)
File size: 7.9 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 3 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, see <http://www.gnu.org/licenses/>.
20
21*/
22
23#include "includes.h"
24
25/****************************************************************************
26 Deal with a response packet when releasing one of our names.
27****************************************************************************/
28
29static void release_name_response(struct subnet_record *subrec,
30 struct response_record *rrec, struct packet_struct *p)
31{
32 /*
33 * If we are releasing broadcast, then getting a response is an
34 * error. If we are releasing unicast, then we expect to get a response.
35 */
36 struct nmb_packet *nmb = &p->packet.nmb;
37 bool bcast = nmb->header.nm_flags.bcast;
38 bool success = True;
39 struct nmb_name *question_name = &rrec->packet->packet.nmb.question.question_name;
40 struct nmb_name *answer_name = &nmb->answers->rr_name;
41 struct in_addr released_ip;
42
43 /* Sanity check. Ensure that the answer name in the incoming packet is the
44 same as the requested name in the outgoing packet. */
45 if (!nmb_name_equal(question_name, answer_name)) {
46 DEBUG(0,("release_name_response: Answer name %s differs from question name %s.\n",
47 nmb_namestr(answer_name), nmb_namestr(question_name)));
48 return;
49 }
50
51 if (bcast) {
52 /* Someone sent a response to a bcast release? ignore it. */
53 return;
54 }
55
56 /* Unicast - check to see if the response allows us to release the name. */
57 if (nmb->header.rcode != 0) {
58 /* Error code - we were told not to release the name ! What now ! */
59 success = False;
60
61 DEBUG(0,("release_name_response: WINS server at IP %s rejected our \
62name release of name %s with error code %d.\n",
63 inet_ntoa(p->ip),
64 nmb_namestr(answer_name), nmb->header.rcode));
65 } else if (nmb->header.opcode == NMB_WACK_OPCODE) {
66 /* WINS server is telling us to wait. Pretend we didn't get
67 the response but don't send out any more release requests. */
68
69 DEBUG(5,("release_name_response: WACK from WINS server %s in releasing \
70name %s on subnet %s.\n",
71 inet_ntoa(p->ip), nmb_namestr(answer_name), subrec->subnet_name));
72
73 rrec->repeat_count = 0;
74 /* How long we should wait for. */
75 rrec->repeat_time = p->timestamp + nmb->answers->ttl;
76 rrec->num_msgs--;
77 return;
78 }
79
80 DEBUG(5,("release_name_response: %s in releasing name %s on subnet %s.\n",
81 success ? "success" : "failure", nmb_namestr(answer_name), subrec->subnet_name));
82 if (success) {
83 putip((char*)&released_ip ,&nmb->answers->rdata[2]);
84
85 if(rrec->success_fn)
86 (*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, answer_name, released_ip);
87 standard_success_release( subrec, rrec->userdata, answer_name, released_ip);
88 } else {
89 /* We have no standard_fail_release - maybe we should add one ? */
90 if (rrec->fail_fn) {
91 (*(release_name_fail_function)rrec->fail_fn)(subrec, rrec, answer_name);
92 }
93 }
94
95 remove_response_record(subrec, rrec);
96}
97
98/****************************************************************************
99 Deal with a timeout when releasing one of our names.
100****************************************************************************/
101
102static void release_name_timeout_response(struct subnet_record *subrec,
103 struct response_record *rrec)
104{
105 /* a release is *always* considered to be successful when it
106 times out. This doesn't cause problems as if a WINS server
107 doesn't respond and someone else wants the name then the
108 normal WACK/name query from the WINS server will cope */
109 struct nmb_packet *sent_nmb = &rrec->packet->packet.nmb;
110 bool bcast = sent_nmb->header.nm_flags.bcast;
111 struct nmb_name *question_name = &sent_nmb->question.question_name;
112 struct in_addr released_ip;
113
114 /* Get the ip address we were trying to release. */
115 putip((char*)&released_ip ,&sent_nmb->additional->rdata[2]);
116
117 if (!bcast) {
118 /* mark the WINS server temporarily dead */
119 wins_srv_died(rrec->packet->ip, released_ip);
120 }
121
122 DEBUG(5,("release_name_timeout_response: success in releasing name %s on subnet %s.\n",
123 nmb_namestr(question_name), subrec->subnet_name));
124
125 if (rrec->success_fn) {
126 (*(release_name_success_function)rrec->success_fn)(subrec, rrec->userdata, question_name, released_ip);
127 }
128
129 standard_success_release( subrec, rrec->userdata, question_name, released_ip);
130 remove_response_record(subrec, rrec);
131}
132
133
134/*
135 when releasing a name with WINS we need to send the release to each of
136 the WINS groups
137*/
138static void wins_release_name(struct name_record *namerec,
139 release_name_success_function success_fn,
140 release_name_fail_function fail_fn,
141 struct userdata_struct *userdata)
142{
143 int t, i;
144 char **wins_tags;
145
146 /* get the list of wins tags - we try to release for each of them */
147 wins_tags = wins_srv_tags();
148
149 for (t=0;wins_tags && wins_tags[t]; t++) {
150 for (i = 0; i < namerec->data.num_ips; i++) {
151 struct in_addr wins_ip = wins_srv_ip_tag(wins_tags[t], namerec->data.ip[i]);
152
153 bool last_one = ((i==namerec->data.num_ips - 1) && !wins_tags[t+1]);
154 if (queue_release_name(unicast_subnet,
155 release_name_response,
156 release_name_timeout_response,
157 last_one?success_fn : NULL,
158 last_one? fail_fn : NULL,
159 last_one? userdata : NULL,
160 &namerec->name,
161 namerec->data.nb_flags,
162 namerec->data.ip[i],
163 wins_ip) == NULL) {
164 DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
165 nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
166 }
167 }
168 }
169
170 wins_srv_tags_free(wins_tags);
171}
172
173
174/****************************************************************************
175 Try and release one of our names.
176****************************************************************************/
177
178void release_name(struct subnet_record *subrec, struct name_record *namerec,
179 release_name_success_function success_fn,
180 release_name_fail_function fail_fn,
181 struct userdata_struct *userdata)
182{
183 int i;
184
185 /* Ensure it's a SELF name, and in the ACTIVE state. */
186 if ((namerec->data.source != SELF_NAME) || !NAME_IS_ACTIVE(namerec)) {
187 DEBUG(0,("release_name: Cannot release name %s from subnet %s. Source was %d \n",
188 nmb_namestr(&namerec->name), subrec->subnet_name, namerec->data.source));
189 return;
190 }
191
192 /* Set the name into the deregistering state. */
193 namerec->data.nb_flags |= NB_DEREG;
194
195 /* wins releases are a bit different */
196 if (subrec == unicast_subnet) {
197 wins_release_name(namerec, success_fn, fail_fn, userdata);
198 return;
199 }
200
201 /*
202 * Go through and release the name for all known ip addresses.
203 * Only call the success/fail function on the last one (it should
204 * only be done once).
205 */
206 for (i = 0; i < namerec->data.num_ips; i++) {
207 if (queue_release_name(subrec,
208 release_name_response,
209 release_name_timeout_response,
210 (i == (namerec->data.num_ips - 1)) ? success_fn : NULL,
211 (i == (namerec->data.num_ips - 1)) ? fail_fn : NULL,
212 (i == (namerec->data.num_ips - 1)) ? userdata : NULL,
213 &namerec->name,
214 namerec->data.nb_flags,
215 namerec->data.ip[i],
216 subrec->bcast_ip) == NULL) {
217 DEBUG(0,("release_name: Failed to send packet trying to release name %s IP %s\n",
218 nmb_namestr(&namerec->name), inet_ntoa(namerec->data.ip[i]) ));
219 }
220 }
221}
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