1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*
Unix SMB/CIFS implementation.
Trusted domain names cache on top of gencache.
Copyright (C) Rafal Szczesniak 2002
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_ALL /* there's no proper class yet */
#define TDOMKEY_FMT "TDOM/%s"
/**
* @file trustdom_cache.c
*
* Implementation of trusted domain names cache useful when
* samba acts as domain member server. In such case, caching
* domain names currently trusted gives a performance gain
* because there's no need to query PDC each time we need
* list of trusted domains
**/
/**
* Initialise trustdom name caching system. Call gencache
* initialisation routine to perform necessary activities.
*
* @return true upon successful cache initialisation or
* false if cache init failed
**/
BOOL trustdom_cache_enable(void)
{
/* Init trustdom cache by calling gencache initialisation */
if (!gencache_init()) {
DEBUG(2, ("trustdomcache_enable: Couldn't initialise trustdom cache on top of gencache.\n"));
return False;
}
return True;
}
/**
* Shutdown trustdom name caching system. Calls gencache
* shutdown function.
*
* @return true upon successful cache close or
* false if it failed
**/
BOOL trustdom_cache_shutdown(void)
{
/* Close trustdom cache by calling gencache shutdown */
if (!gencache_shutdown()) {
DEBUG(2, ("trustdomcache_shutdown: Couldn't shutdown trustdom cache on top of gencache.\n"));
return False;
}
return True;
}
/**
* Form up trustdom name key. It is based only
* on domain name now.
*
* @param name trusted domain name
* @return cache key for use in gencache mechanism
**/
static char* trustdom_cache_key(const char* name)
{
char* keystr;
asprintf(&keystr, TDOMKEY_FMT, strupper_static(name));
return keystr;
}
/**
* Store trusted domain in gencache as the domain name (key)
* and ip address of domain controller (value)
*
* @param name trusted domain name
* @param alt_name alternative trusted domain name (used in ADS domains)
* @param sid trusted domain's SID
* @param timeout cache entry expiration time
* @return true upon successful value storing or
* false if store attempt failed
**/
BOOL trustdom_cache_store(char* name, char* alt_name, const DOM_SID *sid,
time_t timeout)
{
char *key, *alt_key;
fstring sid_string;
/*
* we use gecache call to avoid annoying debug messages
* about initialised trustdom
*/
if (!gencache_init()) return False;
DEBUG(5, ("trustdom_store: storing SID %s of domain %s\n",
sid_string_static(sid), name));
key = trustdom_cache_key(name);
alt_key = alt_name ? trustdom_cache_key(alt_name) : NULL;
/* Generate string representation domain SID */
sid_to_string(sid_string, sid);
/*
* try to put the names in the cache
*/
if (alt_key) {
return (gencache_set(alt_key, sid_string, timeout)
&& gencache_set(key, sid_string, timeout));
}
return gencache_set(key, sid_string, timeout);
}
/**
* Fetch trusted domain's dc from the gencache.
* This routine can also be used to check whether given
* domain is currently trusted one.
*
* @param name trusted domain name
* @param sid trusted domain's SID to be returned
* @return true if entry is found or
* false if has expired/doesn't exist
**/
BOOL trustdom_cache_fetch(const char* name, DOM_SID* sid)
{
char *key, *value;
time_t timeout;
/* init the cache */
if (!gencache_init()) return False;
/* exit now if null pointers were passed as they're required further */
if (!sid) return False;
/* prepare a key and get the value */
key = trustdom_cache_key(name);
if (!gencache_get(key, &value, &timeout)) {
DEBUG(5, ("no entry for trusted domain %s found.\n", name));
return False;
} else {
DEBUG(5, ("trusted domain %s found (%s)\n", name, value));
}
/* convert ip string representation into in_addr structure */
if(! string_to_sid(sid, value)) {
sid = NULL;
return False;
}
return True;
}
/**
* Delete single trustdom entry. Look at the
* gencache_iterate definition.
*
**/
static void flush_trustdom_name(const char* key, const char *value, time_t timeout, void* dptr)
{
gencache_del(key);
DEBUG(5, ("Deleting entry %s\n", key));
}
/**
* Flush all the trusted domains entries from the cache.
**/
void trustdom_cache_flush(void)
{
if (!gencache_init())
return;
/*
* iterate through each TDOM cache's entry and flush it
* by flush_trustdom_name function
*/
gencache_iterate(flush_trustdom_name, NULL, trustdom_cache_key("*"));
DEBUG(5, ("Trusted domains cache flushed\n"));
}
|
