tinc/src/protocol_subnet.c

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2002-02-11 10:05:58 +00:00
/*
protocol_subnet.c -- handle the meta-protocol, subnets
Copyright (C) 1999-2002 Ivo Timmermans <itimmermans@bigfoot.com>,
2000-2002 Guus Sliepen <guus@sliepen.warande.net>
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.
$Id: protocol_subnet.c,v 1.1.4.1 2002/02/11 10:05:58 guus Exp $
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <stdio.h>
#include <stdarg.h>
#include <errno.h>
#include <utils.h>
#include <xalloc.h>
#include <avl_tree.h>
#include "conf.h"
#include "net.h"
#include "netutl.h"
#include "protocol.h"
#include "meta.h"
#include "connection.h"
#include "node.h"
#include "edge.h"
#include "graph.h"
#include "system.h"
int send_add_subnet(connection_t *c, subnet_t *subnet)
{
int x;
char *netstr;
cp
x = send_request(c, "%d %s %s", ADD_SUBNET,
subnet->owner->name, netstr = net2str(subnet));
free(netstr);
cp
return x;
}
int add_subnet_h(connection_t *c)
{
char subnetstr[MAX_STRING_SIZE];
char name[MAX_STRING_SIZE];
node_t *owner;
connection_t *other;
subnet_t *s;
avl_node_t *node;
cp
if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 2)
{
syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_SUBNET", c->name, c->hostname);
return -1;
}
/* Check if owner name is a valid */
if(check_id(name))
{
syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name, c->hostname, _("invalid name"));
return -1;
}
/* Check if subnet string is valid */
if(!(s = str2net(subnetstr)))
{
syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name, c->hostname, _("invalid subnet string"));
return -1;
}
/* Check if the owner of the new subnet is in the connection list */
owner = lookup_node(name);
if(!owner)
{
owner = new_node();
owner->name = xstrdup(name);
node_add(owner);
}
/* Check if we already know this subnet */
if(lookup_subnet(owner, s))
{
free_subnet(s);
return 0;
}
/* If we don't know this subnet, but we are the owner, retaliate with a DEL_SUBNET */
if(owner == myself)
{
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself"), "ADD_SUBNET", c->name, c->hostname);
s->owner = myself;
send_del_subnet(c, s);
return 0;
}
/* If everything is correct, add the subnet to the list of the owner */
subnet_add(owner, s);
/* Tell the rest */
for(node = connection_tree->head; node; node = node->next)
{
other = (connection_t *)node->data;
if(other->status.active && other != c)
send_add_subnet(other, s);
}
cp
return 0;
}
int send_del_subnet(connection_t *c, subnet_t *s)
{
int x;
char *netstr;
cp
netstr = net2str(s);
x = send_request(c, "%d %s %s", DEL_SUBNET, s->owner->name, netstr);
free(netstr);
cp
return x;
}
int del_subnet_h(connection_t *c)
{
char subnetstr[MAX_STRING_SIZE];
char name[MAX_STRING_SIZE];
node_t *owner;
connection_t *other;
subnet_t *s, *find;
avl_node_t *node;
cp
if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 2)
{
syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_SUBNET", c->name, c->hostname);
return -1;
}
/* Check if owner name is a valid */
if(check_id(name))
{
syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name, c->hostname, _("invalid name"));
return -1;
}
/* Check if the owner of the new subnet is in the connection list */
if(!(owner = lookup_node(name)))
{
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_WARNING, _("Got %s from %s (%s) for %s which is not in our node tree"),
"DEL_SUBNET", c->name, c->hostname, name);
return 0;
}
/* Check if subnet string is valid */
if(!(s = str2net(subnetstr)))
{
syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name, c->hostname, _("invalid subnet string"));
return -1;
}
/* If everything is correct, delete the subnet from the list of the owner */
s->owner = owner;
find = lookup_subnet(owner, s);
free_subnet(s);
if(!find)
{
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_WARNING, _("Got %s from %s (%s) for %s which does not appear in his subnet tree"),
"DEL_SUBNET", c->name, c->hostname, name);
return 0;
}
/* If we are the owner of this subnet, retaliate with an ADD_SUBNET */
if(owner == myself)
{
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_WARNING, _("Got %s from %s (%s) for ourself"), "DEL_SUBNET", c->name, c->hostname);
send_add_subnet(c, find);
return 0;
}
/* Tell the rest */
for(node = connection_tree->head; node; node = node->next)
{
other = (connection_t *)node->data;
if(other->status.active && other != c)
send_del_subnet(other, find);
}
/* Finally, delete it. */
subnet_del(owner, find);
cp
return 0;
}