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/*
Unix SMB/CIFS implementation.
Samba utility functions
Copyright (C) Andrew Tridgell 1992-2002
Copyright (C) Christopher R. Hertel 2000
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"
/* how long a server is marked dead for */
#define DEATH_TIME 600
/* a list of wins server that are marked dead. */
static struct wins_dead {
struct in_addr ip;
time_t revival; /* when it will be revived */
struct wins_dead *next, *prev;
} *dead_servers;
/*
see if an ip is on the dead list
*/
static int wins_is_dead(struct in_addr ip)
{
struct wins_dead *d;
for (d=dead_servers; d; d=d->next) {
if (ip_equal(ip, d->ip)) {
/* it might be due for revival */
if (d->revival <= time(NULL)) {
DEBUG(4,("Reviving wins server %s\n", inet_ntoa(ip)));
DLIST_REMOVE(dead_servers, d);
free(d);
return 0;
}
return 1;
}
}
return 0;
}
/*
mark a wins server as temporarily dead
*/
void wins_srv_died(struct in_addr ip)
{
struct wins_dead *d;
if (is_zero_ip(ip) || wins_is_dead(ip)) {
return;
}
d = (struct wins_dead *)malloc(sizeof(*d));
if (!d) return;
d->ip = ip;
d->revival = time(NULL) + DEATH_TIME;
DEBUG(4,("Marking wins server %s dead for %u seconds\n", inet_ntoa(ip), DEATH_TIME));
DLIST_ADD(dead_servers, d);
}
/*
return the total number of wins servers, dead or not
*/
unsigned long wins_srv_count(void)
{
char **list;
int count = 0;
list = lp_wins_server_list();
for (count=0; list && list[count]; count++) /* nop */ ;
DEBUG(6,("Found %u wins servers in list\n", count));
return count;
}
/*
return the IP of the currently active wins server, or the zero IP otherwise
*/
struct in_addr wins_srv_ip(void)
{
char **list;
struct in_addr ip;
int i;
list = lp_wins_server_list();
if (!list || !list[0]) {
zero_ip(&ip);
return ip;
}
/* find the first live one */
for (i=0; list[i]; i++) {
ip = *interpret_addr2(list[i]);
if (!wins_is_dead(ip)) {
DEBUG(6,("Current wins server is %s\n", inet_ntoa(ip)));
return ip;
}
}
/* damn, they are all dead. Keep trying the primary until they revive */
ip = *interpret_addr2(list[0]);
return ip;
}
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