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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"
/* -------------------------------------------------------------------------- **
* 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 );
}
}
}
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