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-rw-r--r--source3/libsmb/libsmb_cache.c191
1 files changed, 191 insertions, 0 deletions
diff --git a/source3/libsmb/libsmb_cache.c b/source3/libsmb/libsmb_cache.c
new file mode 100644
index 0000000000..34b818ee74
--- /dev/null
+++ b/source3/libsmb/libsmb_cache.c
@@ -0,0 +1,191 @@
+/*
+ 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 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"
+
+/*
+ * Define this to get the real SMBCFILE and SMBCSRV structures
+ */
+#define _SMBC_INTERNAL
+#include "libsmbclient.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
+ */
+static int smbc_add_cached_server(SMBCCTX * context, SMBCSRV * new,
+ char * server, char * share,
+ char * workgroup, char * username)
+{
+ struct smbc_server_cache * srvcache = NULL;
+
+ if (!(srvcache = malloc(sizeof(*srvcache)))) {
+ errno = ENOMEM;
+ DEBUG(3, ("Not enough space for server cache allocation\n"));
+ return 1;
+ }
+
+ ZERO_STRUCTP(srvcache);
+
+ srvcache->server = new;
+
+ srvcache->server_name = strdup(server);
+ if (!srvcache->server_name) {
+ errno = ENOMEM;
+ goto failed;
+ }
+
+ srvcache->share_name = strdup(share);
+ if (!srvcache->share_name) {
+ errno = ENOMEM;
+ goto failed;
+ }
+
+ srvcache->workgroup = strdup(workgroup);
+ if (!srvcache->workgroup) {
+ errno = ENOMEM;
+ goto failed;
+ }
+
+ srvcache->username = strdup(username);
+ if (!srvcache->username) {
+ errno = ENOMEM;
+ goto failed;
+ }
+
+ DLIST_ADD(((struct smbc_server_cache *)context->server_cache), srvcache);
+ return 0;
+
+ failed:
+ SAFE_FREE(srvcache->server_name);
+ SAFE_FREE(srvcache->share_name);
+ SAFE_FREE(srvcache->workgroup);
+ SAFE_FREE(srvcache->username);
+
+ return 1;
+}
+
+
+
+/*
+ * Search the server cache for a server
+ * returns server_fd on success, -1 on error (not found)
+ * This function is only used if the external cache is not enabled
+ */
+static SMBCSRV * smbc_get_cached_server(SMBCCTX * context, char * server,
+ char * share, char * workgroup, char * user)
+{
+ struct smbc_server_cache * srv = NULL;
+
+ /* Search the cache lines */
+ for (srv=((struct smbc_server_cache *)context->server_cache);srv;srv=srv->next) {
+ if (strcmp(server,srv->server_name) == 0 &&
+ strcmp(share,srv->share_name) == 0 &&
+ strcmp(workgroup,srv->workgroup) == 0 &&
+ strcmp(user, srv->username) == 0)
+ 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
+ */
+static int smbc_remove_cached_server(SMBCCTX * context, SMBCSRV * server)
+{
+ struct smbc_server_cache * srv = NULL;
+
+ for (srv=((struct smbc_server_cache *)context->server_cache);srv;srv=srv->next) {
+ if (server == srv->server) {
+
+ /* remove this sucker */
+ DLIST_REMOVE(((struct smbc_server_cache *)context->server_cache), 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.
+ */
+static int smbc_purge_cached(SMBCCTX * context)
+{
+ struct smbc_server_cache * srv = NULL;
+ int could_not_purge_all = 0;
+
+ for (srv=((struct smbc_server_cache *) context->server_cache);srv;srv=srv->next) {
+ if (smbc_remove_unused_server(context, srv->server)) {
+ /* could not be removed */
+ could_not_purge_all = 1;
+ }
+ }
+ return could_not_purge_all;
+}
+
+
+
+/*
+ * This functions initializes all server-cache related functions
+ * to the default (internal) system.
+ *
+ * We use this to make the rest of the cache system static.
+ */
+
+int smbc_default_cache_functions(SMBCCTX * context)
+{
+ context->callbacks.add_cached_srv_fn = smbc_add_cached_server;
+ context->callbacks.get_cached_srv_fn = smbc_get_cached_server;
+ context->callbacks.remove_cached_srv_fn = smbc_remove_cached_server;
+ context->callbacks.purge_cached_fn = smbc_purge_cached;
+
+ return 0;
+}