source: branches/samba-3.5.x/source3/nmbd/nmbd_browserdb.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 5.6 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 Copyright (C) Christopher R. Hertel 1998
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
21
22*/
23/* -------------------------------------------------------------------------- **
24 * Modified July 1998 by CRH.
25 * I converted this module to use the canned doubly-linked lists. I also
26 * added comments above the functions where possible.
27 */
28
29#include "includes.h"
30
31/* -------------------------------------------------------------------------- **
32 * Variables...
33 *
34 * lmb_browserlist - This is our local master browser list.
35 */
36
37struct browse_cache_record *lmb_browserlist;
38
39/* -------------------------------------------------------------------------- **
40 * Functions...
41 */
42
43/* ************************************************************************** **
44 * Remove and free a browser list entry.
45 *
46 * Input: browc - A pointer to the entry to be removed from the list and
47 * freed.
48 * Output: none.
49 *
50 * ************************************************************************** **
51 */
52static void remove_lmb_browser_entry( struct browse_cache_record *browc )
53{
54 DLIST_REMOVE(lmb_browserlist, browc);
55 SAFE_FREE(browc);
56}
57
58/* ************************************************************************** **
59 * Update a browser death time.
60 *
61 * Input: browc - Pointer to the entry to be updated.
62 * Output: none.
63 *
64 * ************************************************************************** **
65 */
66void update_browser_death_time( struct browse_cache_record *browc )
67{
68 /* Allow the new lmb to miss an announce period before we remove it. */
69 browc->death_time = time(NULL) + ( (CHECK_TIME_MST_ANNOUNCE + 2) * 60 );
70}
71
72/* ************************************************************************** **
73 * Create a browser entry and add it to the local master browser list.
74 *
75 * Input: work_name
76 * browser_name
77 * ip
78 *
79 * Output: Pointer to the new entry, or NULL if malloc() failed.
80 *
81 * ************************************************************************** **
82 */
83struct browse_cache_record *create_browser_in_lmb_cache( const char *work_name,
84 const char *browser_name,
85 struct in_addr ip )
86{
87 struct browse_cache_record *browc;
88 time_t now = time( NULL );
89
90 browc = SMB_MALLOC_P(struct browse_cache_record);
91
92 if( NULL == browc ) {
93 DEBUG( 0, ("create_browser_in_lmb_cache: malloc fail !\n") );
94 return( NULL );
95 }
96
97 memset( (char *)browc, '\0', sizeof( *browc ) );
98
99 /* For a new lmb entry we want to sync with it after one minute. This
100 will allow it time to send out a local announce and build its
101 browse list.
102 */
103
104 browc->sync_time = now + 60;
105
106 /* Allow the new lmb to miss an announce period before we remove it. */
107 browc->death_time = now + ( (CHECK_TIME_MST_ANNOUNCE + 2) * 60 );
108
109 unstrcpy( browc->lmb_name, browser_name);
110 unstrcpy( browc->work_group, work_name);
111 strupper_m( browc->lmb_name );
112 strupper_m( browc->work_group );
113
114 browc->ip = ip;
115
116 DLIST_ADD_END(lmb_browserlist, browc, struct browse_cache_record *);
117
118 if( DEBUGLVL( 3 ) ) {
119 Debug1( "nmbd_browserdb:create_browser_in_lmb_cache()\n" );
120 Debug1( " Added lmb cache entry for workgroup %s ", browc->work_group );
121 Debug1( "name %s IP %s ", browc->lmb_name, inet_ntoa(ip) );
122 Debug1( "ttl %d\n", (int)browc->death_time );
123 }
124
125 return( browc );
126}
127
128/* ************************************************************************** **
129 * Find a browser entry in the local master browser list.
130 *
131 * Input: browser_name - The name for which to search.
132 *
133 * Output: A pointer to the matching entry, or NULL if no match was found.
134 *
135 * ************************************************************************** **
136 */
137struct browse_cache_record *find_browser_in_lmb_cache( const char *browser_name )
138{
139 struct browse_cache_record *browc;
140
141 for( browc = lmb_browserlist; browc; browc = browc->next ) {
142 if( strequal( browser_name, browc->lmb_name ) ) {
143 break;
144 }
145 }
146
147 return browc;
148}
149
150/* ************************************************************************** **
151 * Expire timed out browsers in the browserlist.
152 *
153 * Input: t - Expiration time. Entries with death times less than this
154 * value will be removed from the list.
155 * Output: none.
156 *
157 * ************************************************************************** **
158 */
159void expire_lmb_browsers( time_t t )
160{
161 struct browse_cache_record *browc;
162 struct browse_cache_record *nextbrowc;
163
164 for( browc = lmb_browserlist; browc; browc = nextbrowc) {
165 nextbrowc = browc->next;
166
167 if( browc->death_time < t ) {
168 if( DEBUGLVL( 3 ) ) {
169 Debug1( "nmbd_browserdb:expire_lmb_browsers()\n" );
170 Debug1( " Removing timed out lmb entry %s\n", browc->lmb_name );
171 }
172 remove_lmb_browser_entry( browc );
173 }
174 }
175}
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