r616: Bug #1333.
[Samba/gebeck_regimport.git] / source3 / libsmb / libsmb_cache.c
blobcb40b4aaa6b5c75c19539a90fe6b5978dae993f4
1 /*
2 Unix SMB/CIFS implementation.
3 SMB client library implementation (server cache)
4 Copyright (C) Andrew Tridgell 1998
5 Copyright (C) Richard Sharpe 2000
6 Copyright (C) John Terpstra 2000
7 Copyright (C) Tom Jansen (Ninja ISD) 2002
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.
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.
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.
24 #include "includes.h"
27 * Define this to get the real SMBCFILE and SMBCSRV structures
29 #define _SMBC_INTERNAL
30 #include "../include/libsmbclient.h"
33 * Structure we use if internal caching mechanism is used
34 * nothing fancy here.
36 struct smbc_server_cache {
37 char *server_name;
38 char *share_name;
39 char *workgroup;
40 char *username;
41 SMBCSRV *server;
43 struct smbc_server_cache *next, *prev;
49 * Add a new connection to the server cache.
50 * This function is only used if the external cache is not enabled
52 static int smbc_add_cached_server(SMBCCTX * context, SMBCSRV * new,
53 const char * server, const char * share,
54 const char * workgroup, const char * username)
56 struct smbc_server_cache * srvcache = NULL;
58 if (!(srvcache = malloc(sizeof(*srvcache)))) {
59 errno = ENOMEM;
60 DEBUG(3, ("Not enough space for server cache allocation\n"));
61 return 1;
64 ZERO_STRUCTP(srvcache);
66 srvcache->server = new;
68 srvcache->server_name = strdup(server);
69 if (!srvcache->server_name) {
70 errno = ENOMEM;
71 goto failed;
74 srvcache->share_name = strdup(share);
75 if (!srvcache->share_name) {
76 errno = ENOMEM;
77 goto failed;
80 srvcache->workgroup = strdup(workgroup);
81 if (!srvcache->workgroup) {
82 errno = ENOMEM;
83 goto failed;
86 srvcache->username = strdup(username);
87 if (!srvcache->username) {
88 errno = ENOMEM;
89 goto failed;
92 DLIST_ADD((context->server_cache), srvcache);
93 return 0;
95 failed:
96 SAFE_FREE(srvcache->server_name);
97 SAFE_FREE(srvcache->share_name);
98 SAFE_FREE(srvcache->workgroup);
99 SAFE_FREE(srvcache->username);
101 return 1;
107 * Search the server cache for a server
108 * returns server_fd on success, -1 on error (not found)
109 * This function is only used if the external cache is not enabled
111 static SMBCSRV * smbc_get_cached_server(SMBCCTX * context, const char * server,
112 const char * share, const char * workgroup, const char * user)
114 struct smbc_server_cache * srv = NULL;
116 /* Search the cache lines */
117 for (srv=((struct smbc_server_cache *)context->server_cache);srv;srv=srv->next) {
118 if (strcmp(server,srv->server_name) == 0 &&
119 strcmp(share,srv->share_name) == 0 &&
120 strcmp(workgroup,srv->workgroup) == 0 &&
121 strcmp(user, srv->username) == 0)
122 return srv->server;
125 return NULL;
130 * Search the server cache for a server and remove it
131 * returns 0 on success
132 * This function is only used if the external cache is not enabled
134 static int smbc_remove_cached_server(SMBCCTX * context, SMBCSRV * server)
136 struct smbc_server_cache * srv = NULL;
138 for (srv=((struct smbc_server_cache *)context->server_cache);srv;srv=srv->next) {
139 if (server == srv->server) {
141 /* remove this sucker */
142 DLIST_REMOVE(context->server_cache, srv);
143 SAFE_FREE(srv->server_name);
144 SAFE_FREE(srv->share_name);
145 SAFE_FREE(srv->workgroup);
146 SAFE_FREE(srv->username);
147 SAFE_FREE(srv);
148 return 0;
151 /* server not found */
152 return 1;
157 * Try to remove all the servers in cache
158 * returns 1 on failure and 0 if all servers could be removed.
160 static int smbc_purge_cached(SMBCCTX * context)
162 struct smbc_server_cache * srv;
163 struct smbc_server_cache * next;
164 int could_not_purge_all = 0;
166 for (srv = ((struct smbc_server_cache *) context->server_cache),
167 next = (srv ? srv->next :NULL);
168 srv;
169 srv = next, next = (srv ? srv->next : NULL)) {
171 if (smbc_remove_unused_server(context, srv->server)) {
172 /* could not be removed */
173 could_not_purge_all = 1;
176 return could_not_purge_all;
182 * This functions initializes all server-cache related functions
183 * to the default (internal) system.
185 * We use this to make the rest of the cache system static.
188 int smbc_default_cache_functions(SMBCCTX * context)
190 context->callbacks.add_cached_srv_fn = smbc_add_cached_server;
191 context->callbacks.get_cached_srv_fn = smbc_get_cached_server;
192 context->callbacks.remove_cached_srv_fn = smbc_remove_cached_server;
193 context->callbacks.purge_cached_fn = smbc_purge_cached;
195 return 0;