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-rw-r--r--source3/nmbd/nmbd_browserdb.c180
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diff --git a/source3/nmbd/nmbd_browserdb.c b/source3/nmbd/nmbd_browserdb.c
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+/*
+ Unix SMB/CIFS implementation.
+ NBT netbios routines and daemon - version 2
+ Copyright (C) Andrew Tridgell 1994-1998
+ Copyright (C) Luke Kenneth Casson Leighton 1994-1998
+ Copyright (C) Jeremy Allison 1994-1998
+ Copyright (C) Christopher R. Hertel 1998
+
+ 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/>.
+
+*/
+/* -------------------------------------------------------------------------- **
+ * Modified July 1998 by CRH.
+ * I converted this module to use the canned doubly-linked lists. I also
+ * added comments above the functions where possible.
+ */
+
+#include "includes.h"
+#include "nmbd/nmbd.h"
+#include "lib/util/string_wrappers.h"
+
+/* -------------------------------------------------------------------------- **
+ * Variables...
+ *
+ * lmb_browserlist - This is our local master browser list.
+ */
+
+struct browse_cache_record *lmb_browserlist;
+
+/* -------------------------------------------------------------------------- **
+ * Functions...
+ */
+
+/* ************************************************************************** **
+ * Remove and free a browser list entry.
+ *
+ * Input: browc - A pointer to the entry to be removed from the list and
+ * freed.
+ * Output: none.
+ *
+ * ************************************************************************** **
+ */
+static void remove_lmb_browser_entry( struct browse_cache_record *browc )
+{
+ DLIST_REMOVE(lmb_browserlist, browc);
+ SAFE_FREE(browc);
+}
+
+/* ************************************************************************** **
+ * Update a browser death time.
+ *
+ * Input: browc - Pointer to the entry to be updated.
+ * Output: none.
+ *
+ * ************************************************************************** **
+ */
+void update_browser_death_time( struct browse_cache_record *browc )
+{
+ /* Allow the new lmb to miss an announce period before we remove it. */
+ browc->death_time = time(NULL) + ( (CHECK_TIME_MST_ANNOUNCE + 2) * 60 );
+}
+
+/* ************************************************************************** **
+ * Create a browser entry and add it to the local master browser list.
+ *
+ * Input: work_name
+ * browser_name
+ * ip
+ *
+ * Output: Pointer to the new entry, or NULL if malloc() failed.
+ *
+ * ************************************************************************** **
+ */
+struct browse_cache_record *create_browser_in_lmb_cache( const char *work_name,
+ const char *browser_name,
+ struct in_addr ip )
+{
+ struct browse_cache_record *browc;
+ time_t now = time( NULL );
+
+ browc = SMB_MALLOC_P(struct browse_cache_record);
+
+ if( NULL == browc ) {
+ DEBUG( 0, ("create_browser_in_lmb_cache: malloc fail !\n") );
+ return( NULL );
+ }
+
+ memset( (char *)browc, '\0', sizeof( *browc ) );
+
+ /* For a new lmb entry we want to sync with it after one minute. This
+ will allow it time to send out a local announce and build its
+ browse list.
+ */
+
+ browc->sync_time = now + 60;
+
+ /* Allow the new lmb to miss an announce period before we remove it. */
+ browc->death_time = now + ( (CHECK_TIME_MST_ANNOUNCE + 2) * 60 );
+
+ unstrcpy( browc->lmb_name, browser_name);
+ unstrcpy( browc->work_group, work_name);
+ if (!strupper_m( browc->lmb_name )) {
+ SAFE_FREE(browc);
+ return NULL;
+ }
+ if (!strupper_m( browc->work_group )) {
+ SAFE_FREE(browc);
+ return NULL;
+ }
+
+ browc->ip = ip;
+
+ DLIST_ADD_END(lmb_browserlist, browc);
+
+ DEBUG(3, ("nmbd_browserdb:create_browser_in_lmb_cache()\n"));
+ DEBUGADD(3, (" Added lmb cache entry for workgroup %s name %s IP %s "
+ "ttl %d\n", browc->work_group, browc->lmb_name,
+ inet_ntoa(ip), (int)browc->death_time));
+
+ return( browc );
+}
+
+/* ************************************************************************** **
+ * Find a browser entry in the local master browser list.
+ *
+ * Input: browser_name - The name for which to search.
+ *
+ * Output: A pointer to the matching entry, or NULL if no match was found.
+ *
+ * ************************************************************************** **
+ */
+struct browse_cache_record *find_browser_in_lmb_cache( const char *browser_name )
+{
+ struct browse_cache_record *browc;
+
+ for( browc = lmb_browserlist; browc; browc = browc->next ) {
+ if( strequal( browser_name, browc->lmb_name ) ) {
+ break;
+ }
+ }
+
+ return browc;
+}
+
+/* ************************************************************************** **
+ * Expire timed out browsers in the browserlist.
+ *
+ * Input: t - Expiration time. Entries with death times less than this
+ * value will be removed from the list.
+ * Output: none.
+ *
+ * ************************************************************************** **
+ */
+void expire_lmb_browsers( time_t t )
+{
+ struct browse_cache_record *browc;
+ struct browse_cache_record *nextbrowc;
+
+ for( browc = lmb_browserlist; browc; browc = nextbrowc) {
+ nextbrowc = browc->next;
+
+ if( browc->death_time < t ) {
+ DEBUG(3, ("nmbd_browserdb:expire_lmb_browsers()\n"));
+ DEBUGADD(3, (" Removing timed out lmb entry %s\n",
+ browc->lmb_name));
+ remove_lmb_browser_entry( browc );
+ }
+ }
+}