1 files changed, 182 insertions, 0 deletions
diff --git a/source4/nmbd/nmbd_browserdb.c b/source4/nmbd/nmbd_browserdb.c
new file mode 100644
index 0000000000..a4ef98e265
--- /dev/null
+++ b/source4/nmbd/nmbd_browserdb.c
@@ -0,0 +1,182 @@
+/* 
+   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 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.
+   
+*/
+/* -------------------------------------------------------------------------- **
+ * 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"
+
+/* -------------------------------------------------------------------------- **
+ * Variables...
+ *
+ *  lmb_browserlist - This is our local master browser list. 
+ */
+
+ubi_dlNewList( 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 )
+  {
+  safe_free( ubi_dlRemThis( lmb_browserlist, browc ) );
+  } /* remove_lmb_browser_entry */
+
+/* ************************************************************************** **
+ * 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 );
+  } /* update_browser_death_time */
+
+/* ************************************************************************** **
+ * 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( char *work_name, 
+                                                         char *browser_name, 
+                                                         struct in_addr ip )
+  {
+  struct browse_cache_record *browc;
+  time_t now = time( NULL );
+
+  browc = (struct browse_cache_record *)malloc( sizeof( *browc ) );
+
+  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 );
+
+  StrnCpy(  browc->lmb_name, browser_name, sizeof(browc->lmb_name)-1 );
+  StrnCpy(  browc->work_group, work_name, sizeof(browc->work_group)-1 );
+  strupper( browc->lmb_name );
+  strupper( browc->work_group );
+  
+  browc->ip = ip;
+ 
+  (void)ubi_dlAddTail( lmb_browserlist, browc );
+
+  if( DEBUGLVL( 3 ) )
+    {
+    Debug1( "nmbd_browserdb:create_browser_in_lmb_cache()\n" );
+    Debug1( "  Added lmb cache entry for workgroup %s ", browc->work_group );
+    Debug1( "name %s IP %s ", browc->lmb_name, inet_ntoa(ip) );
+    Debug1( "ttl %d\n", (int)browc->death_time );
+    }
+  
+  return( browc );
+  } /* create_browser_in_lmb_cache */
+
+/* ************************************************************************** **
+ * 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( char *browser_name )
+  {
+  struct browse_cache_record *browc;
+
+  for( browc = (struct browse_cache_record *)ubi_dlFirst( lmb_browserlist );
+       browc;
+       browc = (struct browse_cache_record *)ubi_dlNext( browc ) )
+    if( strequal( browser_name, browc->lmb_name ) )
+      break;
+
+  return( browc );
+  } /* find_browser_in_lmb_cache */
+
+/* ************************************************************************** **
+ *  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 = (struct browse_cache_record *)ubi_dlFirst( lmb_browserlist );
+       browc;
+       browc = nextbrowc )
+    {
+    nextbrowc = (struct browse_cache_record *)ubi_dlNext( browc );
+
+    if( browc->death_time < t )
+      {
+      if( DEBUGLVL( 3 ) )
+        {
+        Debug1( "nmbd_browserdb:expire_lmb_browsers()\n" );
+        Debug1( "  Removing timed out lmb entry %s\n", browc->lmb_name );
+        }
+      remove_lmb_browser_entry( browc );
+      }
+    }
+  } /* expire_lmb_browsers */