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Unix SMB/CIFS implementation.
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SMB client library implementation (server cache)
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Copyright (C) Andrew Tridgell 1998
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Copyright (C) Richard Sharpe 2000
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Copyright (C) John Terpstra 2000
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Copyright (C) Tom Jansen (Ninja ISD) 2002
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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#include "include/libsmbclient.h"
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#include "../include/libsmb_internal.h"
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* Structure we use if internal caching mechanism is used
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struct smbc_server_cache {
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struct smbc_server_cache *next, *prev;
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* Add a new connection to the server cache.
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* This function is only used if the external cache is not enabled
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static int smbc_add_cached_server(SMBCCTX * context, SMBCSRV * newsrv,
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const char * server, const char * share,
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const char * workgroup, const char * username)
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struct smbc_server_cache * srvcache = NULL;
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if (!(srvcache = SMB_MALLOC_P(struct smbc_server_cache))) {
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DEBUG(3, ("Not enough space for server cache allocation\n"));
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ZERO_STRUCTP(srvcache);
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srvcache->server = newsrv;
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srvcache->server_name = SMB_STRDUP(server);
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if (!srvcache->server_name) {
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srvcache->share_name = SMB_STRDUP(share);
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if (!srvcache->share_name) {
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srvcache->workgroup = SMB_STRDUP(workgroup);
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if (!srvcache->workgroup) {
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srvcache->username = SMB_STRDUP(username);
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if (!srvcache->username) {
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DLIST_ADD((context->server_cache), srvcache);
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SAFE_FREE(srvcache->server_name);
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SAFE_FREE(srvcache->share_name);
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SAFE_FREE(srvcache->workgroup);
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SAFE_FREE(srvcache->username);
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* Search the server cache for a server
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* returns server handle on success, NULL on error (not found)
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* This function is only used if the external cache is not enabled
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static SMBCSRV * smbc_get_cached_server(SMBCCTX * context, const char * server,
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const char * share, const char * workgroup, const char * user)
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struct smbc_server_cache * srv = NULL;
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/* Search the cache lines */
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for (srv=((struct smbc_server_cache *)context->server_cache);srv;srv=srv->next) {
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if (strcmp(server,srv->server_name) == 0 &&
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strcmp(workgroup,srv->workgroup) == 0 &&
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strcmp(user, srv->username) == 0) {
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/* If the share name matches, we're cool */
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if (strcmp(share, srv->share_name) == 0) {
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* We only return an empty share name or the attribute
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* server on an exact match (which would have been
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if (*share == '\0' || strcmp(share, "*IPC$") == 0)
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* Never return an empty share name or the attribute
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* server if it wasn't what was requested.
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if (*srv->share_name == '\0' ||
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strcmp(srv->share_name, "*IPC$") == 0)
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* If we're only allowing one share per server, then
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* a connection to the server (other than the
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* attribute server connection) is cool.
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if (context->options.one_share_per_server) {
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* The currently connected share name
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* doesn't match the requested share, so
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* disconnect from the current share.
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if (! cli_tdis(srv->server->cli)) {
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/* Sigh. Couldn't disconnect. */
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cli_shutdown(srv->server->cli);
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srv->server->cli = NULL;
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context->callbacks.remove_cached_srv_fn(context, srv->server);
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* Save the new share name. We've
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* disconnected from the old share, and are
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* about to connect to the new one.
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SAFE_FREE(srv->share_name);
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srv->share_name = SMB_STRDUP(share);
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if (!srv->share_name) {
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cli_shutdown(srv->server->cli);
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srv->server->cli = NULL;
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context->callbacks.remove_cached_srv_fn(context, srv->server);
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* Search the server cache for a server and remove it
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* returns 0 on success
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* This function is only used if the external cache is not enabled
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static int smbc_remove_cached_server(SMBCCTX * context, SMBCSRV * server)
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struct smbc_server_cache * srv = NULL;
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for (srv=((struct smbc_server_cache *)context->server_cache);srv;srv=srv->next) {
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if (server == srv->server) {
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/* remove this sucker */
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DLIST_REMOVE(context->server_cache, srv);
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SAFE_FREE(srv->server_name);
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SAFE_FREE(srv->share_name);
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SAFE_FREE(srv->workgroup);
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SAFE_FREE(srv->username);
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/* server not found */
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* Try to remove all the servers in cache
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* returns 1 on failure and 0 if all servers could be removed.
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static int smbc_purge_cached(SMBCCTX * context)
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struct smbc_server_cache * srv;
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struct smbc_server_cache * next;
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int could_not_purge_all = 0;
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for (srv = ((struct smbc_server_cache *) context->server_cache),
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next = (srv ? srv->next :NULL);
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srv = next, next = (srv ? srv->next : NULL)) {
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if (smbc_remove_unused_server(context, srv->server)) {
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/* could not be removed */
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could_not_purge_all = 1;
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return could_not_purge_all;
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* This functions initializes all server-cache related functions
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* to the default (internal) system.
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* We use this to make the rest of the cache system static.
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int smbc_default_cache_functions(SMBCCTX * context)
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context->callbacks.add_cached_srv_fn = smbc_add_cached_server;
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context->callbacks.get_cached_srv_fn = smbc_get_cached_server;
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context->callbacks.remove_cached_srv_fn = smbc_remove_cached_server;
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context->callbacks.purge_cached_fn = smbc_purge_cached;