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
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
|
/*
Unix SMB/CIFS implementation.
SMB client library implementation (server cache)
Copyright (C) Andrew Tridgell 1998
Copyright (C) Richard Sharpe 2000
Copyright (C) John Terpstra 2000
Copyright (C) Tom Jansen (Ninja ISD) 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "libsmbclient.h"
#include "libsmb_internal.h"
/*
* Structure we use if internal caching mechanism is used
* nothing fancy here.
*/
struct smbc_server_cache {
char *server_name;
char *share_name;
char *workgroup;
char *username;
SMBCSRV *server;
struct smbc_server_cache *next, *prev;
};
/*
* Add a new connection to the server cache.
* This function is only used if the external cache is not enabled
*/
int
SMBC_add_cached_server(SMBCCTX * context,
SMBCSRV * newsrv,
const char * server,
const char * share,
const char * workgroup,
const char * username)
{
struct smbc_server_cache * srvcache = NULL;
if (!(srvcache = SMB_MALLOC_P(struct smbc_server_cache))) {
errno = ENOMEM;
DEBUG(3, ("Not enough space for server cache allocation\n"));
return 1;
}
ZERO_STRUCTP(srvcache);
srvcache->server = newsrv;
srvcache->server_name = SMB_STRDUP(server);
if (!srvcache->server_name) {
errno = ENOMEM;
goto failed;
}
srvcache->share_name = SMB_STRDUP(share);
if (!srvcache->share_name) {
errno = ENOMEM;
goto failed;
}
srvcache->workgroup = SMB_STRDUP(workgroup);
if (!srvcache->workgroup) {
errno = ENOMEM;
goto failed;
}
srvcache->username = SMB_STRDUP(username);
if (!srvcache->username) {
errno = ENOMEM;
goto failed;
}
DLIST_ADD((context->cache.server_cache_data), srvcache);
return 0;
failed:
SAFE_FREE(srvcache->server_name);
SAFE_FREE(srvcache->share_name);
SAFE_FREE(srvcache->workgroup);
SAFE_FREE(srvcache->username);
SAFE_FREE(srvcache);
return 1;
}
/*
* Search the server cache for a server
* returns server handle on success, NULL on error (not found)
* This function is only used if the external cache is not enabled
*/
SMBCSRV *
SMBC_get_cached_server(SMBCCTX * context,
const char * server,
const char * share,
const char * workgroup,
const char * user)
{
struct smbc_server_cache * srv = NULL;
/* Search the cache lines */
for (srv = context->cache.server_cache_data; srv; srv = srv->next) {
if (strcmp(server,srv->server_name) == 0 &&
strcmp(workgroup,srv->workgroup) == 0 &&
strcmp(user, srv->username) == 0) {
/* If the share name matches, we're cool */
if (strcmp(share, srv->share_name) == 0) {
return srv->server;
}
/*
* We only return an empty share name or the attribute
* server on an exact match (which would have been
* caught above).
*/
if (*share == '\0' || strcmp(share, "*IPC$") == 0)
continue;
/*
* Never return an empty share name or the attribute
* server if it wasn't what was requested.
*/
if (*srv->share_name == '\0' ||
strcmp(srv->share_name, "*IPC$") == 0)
continue;
/*
* If we're only allowing one share per server, then
* a connection to the server (other than the
* attribute server connection) is cool.
*/
if (context->options.one_share_per_server) {
/*
* The currently connected share name
* doesn't match the requested share, so
* disconnect from the current share.
*/
if (! cli_tdis(srv->server->cli)) {
/* Sigh. Couldn't disconnect. */
cli_shutdown(srv->server->cli);
srv->server->cli = NULL;
context->cache.remove_cached_server_fn(context, srv->server);
continue;
}
/*
* Save the new share name. We've
* disconnected from the old share, and are
* about to connect to the new one.
*/
SAFE_FREE(srv->share_name);
srv->share_name = SMB_STRDUP(share);
if (!srv->share_name) {
/* Out of memory. */
cli_shutdown(srv->server->cli);
srv->server->cli = NULL;
context->cache.remove_cached_server_fn(context, srv->server);
continue;
}
return srv->server;
}
}
}
return NULL;
}
/*
* Search the server cache for a server and remove it
* returns 0 on success
* This function is only used if the external cache is not enabled
*/
int
SMBC_remove_cached_server(SMBCCTX * context,
SMBCSRV * server)
{
struct smbc_server_cache * srv = NULL;
for (srv = context->cache.server_cache_data; srv; srv = srv->next) {
if (server == srv->server) {
/* remove this sucker */
DLIST_REMOVE(context->cache.server_cache_data, srv);
SAFE_FREE(srv->server_name);
SAFE_FREE(srv->share_name);
SAFE_FREE(srv->workgroup);
SAFE_FREE(srv->username);
SAFE_FREE(srv);
return 0;
}
}
/* server not found */
return 1;
}
/*
* Try to remove all the servers in cache
* returns 1 on failure and 0 if all servers could be removed.
*/
int
SMBC_purge_cached_servers(SMBCCTX * context)
{
struct smbc_server_cache * srv;
struct smbc_server_cache * next;
int could_not_purge_all = 0;
for (srv = context->cache.server_cache_data,
next = (srv ? srv->next :NULL);
srv;
srv = next,
next = (srv ? srv->next : NULL)) {
if (SMBC_remove_unused_server(context, srv->server)) {
/* could not be removed */
could_not_purge_all = 1;
}
}
return could_not_purge_all;
}
|
