Line data    Source code

       1             : /* 
       2             :    Unix SMB/CIFS implementation.
       3             :    NBT netbios routines and daemon - version 2
       4             :    Copyright (C) Andrew Tridgell 1994-1998
       5             :    Copyright (C) Luke Kenneth Casson Leighton 1994-1998
       6             :    Copyright (C) Jeremy Allison 1994-1998
       7             :    Copyright (C) Christopher R. Hertel 1998
       8             :    
       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 3 of the License, or
      12             :    (at your option) any later version.
      13             :    
      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.
      18             :    
      19             :    You should have received a copy of the GNU General Public License
      20             :    along with this program.  If not, see <http://www.gnu.org/licenses/>.
      21             :    
      22             : */
      23             : /* -------------------------------------------------------------------------- **
      24             :  * Modified July 1998 by CRH.
      25             :  *  I converted this module to use the canned doubly-linked lists.  I also
      26             :  *  added comments above the functions where possible.
      27             :  */
      28             : 
      29             : #include "includes.h"
      30             : #include "nmbd/nmbd.h"
      31             : #include "lib/util/string_wrappers.h"
      32             : 
      33             : /* -------------------------------------------------------------------------- **
      34             :  * Variables...
      35             :  *
      36             :  *  lmb_browserlist - This is our local master browser list. 
      37             :  */
      38             : 
      39             : struct browse_cache_record *lmb_browserlist;
      40             : 
      41             : /* -------------------------------------------------------------------------- **
      42             :  * Functions...
      43             :  */
      44             : 
      45             : /* ************************************************************************** **
      46             :  * Remove and free a browser list entry.
      47             :  *
      48             :  *  Input:  browc - A pointer to the entry to be removed from the list and
      49             :  *                  freed.
      50             :  *  Output: none.
      51             :  *
      52             :  * ************************************************************************** **
      53             :  */
      54           0 : static void remove_lmb_browser_entry( struct browse_cache_record *browc )
      55             : {
      56           0 :         DLIST_REMOVE(lmb_browserlist, browc);
      57           0 :         SAFE_FREE(browc);
      58           0 : }
      59             : 
      60             : /* ************************************************************************** **
      61             :  * Update a browser death time.
      62             :  *
      63             :  *  Input:  browc - Pointer to the entry to be updated.
      64             :  *  Output: none.
      65             :  *
      66             :  * ************************************************************************** **
      67             :  */
      68           0 : void update_browser_death_time( struct browse_cache_record *browc )
      69             : {
      70             :         /* Allow the new lmb to miss an announce period before we remove it. */
      71           0 :         browc->death_time = time(NULL) + ( (CHECK_TIME_MST_ANNOUNCE + 2) * 60 );
      72           0 : }
      73             : 
      74             : /* ************************************************************************** **
      75             :  * Create a browser entry and add it to the local master browser list.
      76             :  *
      77             :  *  Input:  work_name
      78             :  *          browser_name
      79             :  *          ip
      80             :  *
      81             :  *  Output: Pointer to the new entry, or NULL if malloc() failed.
      82             :  *
      83             :  * ************************************************************************** **
      84             :  */
      85           0 : struct browse_cache_record *create_browser_in_lmb_cache( const char *work_name, 
      86             :                                                          const char *browser_name, 
      87             :                                                          struct in_addr ip )
      88             : {
      89             :         struct browse_cache_record *browc;
      90           0 :         time_t now = time( NULL );
      91             : 
      92           0 :         browc = SMB_MALLOC_P(struct browse_cache_record);
      93             : 
      94           0 :         if( NULL == browc ) {
      95           0 :                 DEBUG( 0, ("create_browser_in_lmb_cache: malloc fail !\n") );
      96           0 :                 return( NULL );
      97             :         }
      98             : 
      99           0 :         memset( (char *)browc, '\0', sizeof( *browc ) );
     100             :   
     101             :         /* For a new lmb entry we want to sync with it after one minute. This
     102             :          will allow it time to send out a local announce and build its
     103             :          browse list.
     104             :         */
     105             : 
     106           0 :         browc->sync_time = now + 60;
     107             : 
     108             :         /* Allow the new lmb to miss an announce period before we remove it. */
     109           0 :         browc->death_time = now + ( (CHECK_TIME_MST_ANNOUNCE + 2) * 60 );
     110             : 
     111           0 :         unstrcpy( browc->lmb_name, browser_name);
     112           0 :         unstrcpy( browc->work_group, work_name);
     113           0 :         if (!strupper_m( browc->lmb_name )) {
     114           0 :                 SAFE_FREE(browc);
     115           0 :                 return NULL;
     116             :         }
     117           0 :         if (!strupper_m( browc->work_group )) {
     118           0 :                 SAFE_FREE(browc);
     119           0 :                 return NULL;
     120             :         }
     121             :   
     122           0 :         browc->ip = ip;
     123             :  
     124           0 :         DLIST_ADD_END(lmb_browserlist, browc);
     125             : 
     126           0 :         DEBUG(3, ("nmbd_browserdb:create_browser_in_lmb_cache()\n"));
     127           0 :         DEBUGADD(3, ("  Added lmb cache entry for workgroup %s name %s IP %s "
     128             :                      "ttl %d\n", browc->work_group, browc->lmb_name,
     129             :                      inet_ntoa(ip), (int)browc->death_time));
     130             :   
     131           0 :         return( browc );
     132             : }
     133             : 
     134             : /* ************************************************************************** **
     135             :  * Find a browser entry in the local master browser list.
     136             :  *
     137             :  *  Input:  browser_name  - The name for which to search.
     138             :  *
     139             :  *  Output: A pointer to the matching entry, or NULL if no match was found.
     140             :  *
     141             :  * ************************************************************************** **
     142             :  */
     143           0 : struct browse_cache_record *find_browser_in_lmb_cache( const char *browser_name )
     144             : {
     145             :         struct browse_cache_record *browc;
     146             : 
     147           0 :         for( browc = lmb_browserlist; browc; browc = browc->next ) {
     148           0 :                 if( strequal( browser_name, browc->lmb_name ) ) {
     149           0 :                         break;
     150             :                 }
     151             :         }
     152             : 
     153           0 :         return browc;
     154             : }
     155             : 
     156             : /* ************************************************************************** **
     157             :  *  Expire timed out browsers in the browserlist.
     158             :  *
     159             :  *  Input:  t - Expiration time.  Entries with death times less than this
     160             :  *              value will be removed from the list.
     161             :  *  Output: none.
     162             :  *
     163             :  * ************************************************************************** **
     164             :  */
     165        1619 : void expire_lmb_browsers( time_t t )
     166             : {
     167             :         struct browse_cache_record *browc;
     168             :         struct browse_cache_record *nextbrowc;
     169             : 
     170        1619 :         for( browc = lmb_browserlist; browc; browc = nextbrowc) {
     171           0 :                 nextbrowc = browc->next;
     172             : 
     173           0 :                 if( browc->death_time < t ) {
     174           0 :                         DEBUG(3, ("nmbd_browserdb:expire_lmb_browsers()\n"));
     175           0 :                         DEBUGADD(3, ("  Removing timed out lmb entry %s\n",
     176             :                                      browc->lmb_name));
     177           0 :                         remove_lmb_browser_entry( browc );
     178             :                 }
     179             :         }
     180        1619 : }