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

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

Initial code 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 2 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, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22
23*/
24/* -------------------------------------------------------------------------- **
25 * Modified July 1998 by CRH.
26 * I converted this module to use the canned doubly-linked lists. I also
27 * added comments above the functions where possible.
28 */
29
30#include "includes.h"
31
32/* -------------------------------------------------------------------------- **
33 * Variables...
34 *
35 * lmb_browserlist - This is our local master browser list.
36 */
37
38struct browse_cache_record *lmb_browserlist;
39
40/* -------------------------------------------------------------------------- **
41 * Functions...
42 */
43
44/* ************************************************************************** **
45 * Remove and free a browser list entry.
46 *
47 * Input: browc - A pointer to the entry to be removed from the list and
48 * freed.
49 * Output: none.
50 *
51 * ************************************************************************** **
52 */
53static void remove_lmb_browser_entry( struct browse_cache_record *browc )
54{
55 DLIST_REMOVE(lmb_browserlist, browc);
56 SAFE_FREE(browc);
57}
58
59/* ************************************************************************** **
60 * Update a browser death time.
61 *
62 * Input: browc - Pointer to the entry to be updated.
63 * Output: none.
64 *
65 * ************************************************************************** **
66 */
67void update_browser_death_time( struct browse_cache_record *browc )
68{
69 /* Allow the new lmb to miss an announce period before we remove it. */
70 browc->death_time = time(NULL) + ( (CHECK_TIME_MST_ANNOUNCE + 2) * 60 );
71}
72
73/* ************************************************************************** **
74 * Create a browser entry and add it to the local master browser list.
75 *
76 * Input: work_name
77 * browser_name
78 * ip
79 *
80 * Output: Pointer to the new entry, or NULL if malloc() failed.
81 *
82 * ************************************************************************** **
83 */
84struct browse_cache_record *create_browser_in_lmb_cache( const char *work_name,
85 const char *browser_name,
86 struct in_addr ip )
87{
88 struct browse_cache_record *browc;
89 time_t now = time( NULL );
90
91 browc = SMB_MALLOC_P(struct browse_cache_record);
92
93 if( NULL == browc ) {
94 DEBUG( 0, ("create_browser_in_lmb_cache: malloc fail !\n") );
95 return( NULL );
96 }
97
98 memset( (char *)browc, '\0', sizeof( *browc ) );
99
100 /* For a new lmb entry we want to sync with it after one minute. This
101 will allow it time to send out a local announce and build its
102 browse list.
103 */
104
105 browc->sync_time = now + 60;
106
107 /* Allow the new lmb to miss an announce period before we remove it. */
108 browc->death_time = now + ( (CHECK_TIME_MST_ANNOUNCE + 2) * 60 );
109
110 unstrcpy( browc->lmb_name, browser_name);
111 unstrcpy( browc->work_group, work_name);
112 strupper_m( browc->lmb_name );
113 strupper_m( browc->work_group );
114
115 browc->ip = ip;
116
117 DLIST_ADD_END(lmb_browserlist, browc, struct browse_cache_record *);
118
119 if( DEBUGLVL( 3 ) ) {
120 Debug1( "nmbd_browserdb:create_browser_in_lmb_cache()\n" );
121 Debug1( " Added lmb cache entry for workgroup %s ", browc->work_group );
122 Debug1( "name %s IP %s ", browc->lmb_name, inet_ntoa(ip) );
123 Debug1( "ttl %d\n", (int)browc->death_time );
124 }
125
126 return( browc );
127}
128
129/* ************************************************************************** **
130 * Find a browser entry in the local master browser list.
131 *
132 * Input: browser_name - The name for which to search.
133 *
134 * Output: A pointer to the matching entry, or NULL if no match was found.
135 *
136 * ************************************************************************** **
137 */
138struct browse_cache_record *find_browser_in_lmb_cache( const char *browser_name )
139{
140 struct browse_cache_record *browc;
141
142 for( browc = lmb_browserlist; browc; browc = browc->next ) {
143 if( strequal( browser_name, browc->lmb_name ) ) {
144 break;
145 }
146 }
147
148 return browc;
149}
150
151/* ************************************************************************** **
152 * Expire timed out browsers in the browserlist.
153 *
154 * Input: t - Expiration time. Entries with death times less than this
155 * value will be removed from the list.
156 * Output: none.
157 *
158 * ************************************************************************** **
159 */
160void expire_lmb_browsers( time_t t )
161{
162 struct browse_cache_record *browc;
163 struct browse_cache_record *nextbrowc;
164
165 for( browc = lmb_browserlist; browc; browc = nextbrowc) {
166 nextbrowc = browc->next;
167
168 if( browc->death_time < t ) {
169 if( DEBUGLVL( 3 ) ) {
170 Debug1( "nmbd_browserdb:expire_lmb_browsers()\n" );
171 Debug1( " Removing timed out lmb entry %s\n", browc->lmb_name );
172 }
173 remove_lmb_browser_entry( browc );
174 }
175 }
176}
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