2000-10-01 03:21:49 +00:00
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/*
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subnet.c -- handle subnet lookups and lists
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2001-01-07 17:09:07 +00:00
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Copyright (C) 2000,2001 Guus Sliepen <guus@sliepen.warande.net>,
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2000,2001 Ivo Timmermans <itimmermans@bigfoot.com>
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2000-10-01 03:21:49 +00:00
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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2001-10-30 12:59:12 +00:00
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$Id: subnet.c,v 1.1.2.28 2001/10/30 12:59:12 guus Exp $
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2000-10-01 03:21:49 +00:00
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*/
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#include "config.h"
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2000-10-11 10:35:17 +00:00
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2000-11-03 22:35:12 +00:00
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#include <stdio.h>
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#include <syslog.h>
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2001-06-29 13:09:55 +00:00
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#include <string.h>
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2000-11-03 22:35:12 +00:00
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2000-10-28 21:05:20 +00:00
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#include "conf.h"
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2000-11-03 22:35:12 +00:00
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#include "net.h"
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2001-10-27 12:13:17 +00:00
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#include "node.h"
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2000-11-03 22:35:12 +00:00
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#include "subnet.h"
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2000-10-28 21:05:20 +00:00
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#include "system.h"
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2000-10-01 03:21:49 +00:00
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2000-11-03 22:35:12 +00:00
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#include <utils.h>
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#include <xalloc.h>
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2001-01-05 23:53:53 +00:00
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#include <avl_tree.h>
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2000-11-03 22:35:12 +00:00
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2000-10-28 16:41:40 +00:00
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/* lists type of subnet */
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2001-01-05 23:53:53 +00:00
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avl_tree_t *subnet_tree;
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2000-11-20 19:41:13 +00:00
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2000-11-20 19:12:17 +00:00
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/* Subnet comparison */
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2000-10-01 03:21:49 +00:00
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2000-11-20 19:12:17 +00:00
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int subnet_compare_mac(subnet_t *a, subnet_t *b)
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2000-10-01 03:21:49 +00:00
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{
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cp
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2001-10-30 12:59:12 +00:00
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return memcmp(&a->net.mac.address, &b->net.mac.address, sizeof(mac_t));
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2000-10-01 03:21:49 +00:00
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}
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2000-11-20 19:12:17 +00:00
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int subnet_compare_ipv4(subnet_t *a, subnet_t *b)
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2000-10-01 03:21:49 +00:00
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{
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cp
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2001-06-01 08:02:09 +00:00
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/* We compare as if a subnet is a number that equals (address << 32 + netmask). */
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2000-11-20 19:12:17 +00:00
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2001-10-27 12:13:17 +00:00
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if(a->net.ipv4.address < b->net.ipv4.address)
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return -1;
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else if(a->net.ipv4.address > b->net.ipv4.address)
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return 1;
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if(a->net.ipv4.mask < b->net.ipv4.mask)
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return -1;
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else if(a->net.ipv4.mask > b->net.ipv4.mask)
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return 1;
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2001-10-30 12:59:12 +00:00
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return 0;
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2000-11-20 19:12:17 +00:00
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}
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2000-10-01 03:21:49 +00:00
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2000-11-20 19:12:17 +00:00
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int subnet_compare_ipv6(subnet_t *a, subnet_t *b)
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2000-10-01 03:21:49 +00:00
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{
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2001-10-27 12:13:17 +00:00
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int result;
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2000-10-01 03:21:49 +00:00
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cp
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2000-11-20 19:12:17 +00:00
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/* Same as ipv4 case, but with nasty 128 bit addresses */
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2000-10-28 16:41:40 +00:00
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2001-10-27 12:13:17 +00:00
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result = memcmp(a->net.ipv6.address.x, b->net.ipv6.address.x, sizeof(ipv6_t));
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if(result)
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return result;
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result = memcmp(a->net.ipv6.mask.x, b->net.ipv6.mask.x, sizeof(ipv6_t));
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2000-10-24 15:46:18 +00:00
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2001-10-27 12:13:17 +00:00
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if(result)
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return result;
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2001-10-30 12:59:12 +00:00
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return 0;
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2000-11-20 19:12:17 +00:00
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}
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2000-10-24 15:46:18 +00:00
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2000-11-20 19:12:17 +00:00
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int subnet_compare(subnet_t *a, subnet_t *b)
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{
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int x;
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2000-10-28 21:05:20 +00:00
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cp
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2000-11-20 19:12:17 +00:00
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x = a->type - b->type;
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if(x)
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return x;
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switch(a->type)
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2000-10-24 15:46:18 +00:00
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{
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2000-11-20 19:12:17 +00:00
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case SUBNET_MAC:
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return subnet_compare_mac(a, b);
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case SUBNET_IPV4:
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return subnet_compare_ipv4(a, b);
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case SUBNET_IPV6:
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return subnet_compare_ipv6(a, b);
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default:
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syslog(LOG_ERR, _("subnet_compare() was called with unknown subnet type %d, restarting!"), a->type);
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sighup = 1;
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return 0;
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2000-10-24 15:46:18 +00:00
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}
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2000-10-01 03:21:49 +00:00
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}
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2001-10-28 22:42:49 +00:00
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/* Initialising trees */
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void init_subnets(void)
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{
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cp
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subnet_tree = avl_alloc_tree((avl_compare_t)subnet_compare, (avl_action_t)free_subnet);
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cp
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}
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void exit_subnets(void)
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{
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cp
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avl_delete_tree(subnet_tree);
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cp
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}
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avl_tree_t *new_subnet_tree(void)
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{
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cp
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return avl_alloc_tree((avl_compare_t)subnet_compare, NULL);
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cp
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}
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void free_subnet_tree(avl_tree_t *subnet_tree)
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{
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cp
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avl_delete_tree(subnet_tree);
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cp
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}
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2000-11-20 19:12:17 +00:00
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/* Allocating and freeing space for subnets */
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subnet_t *new_subnet(void)
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2000-10-01 03:21:49 +00:00
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{
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cp
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2000-11-20 19:12:17 +00:00
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return (subnet_t *)xmalloc(sizeof(subnet_t));
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}
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2000-10-28 16:41:40 +00:00
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2000-11-20 19:12:17 +00:00
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void free_subnet(subnet_t *subnet)
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{
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cp
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free(subnet);
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}
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2000-10-24 15:46:18 +00:00
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2001-10-30 12:59:12 +00:00
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/* Adding and removing subnets */
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2000-10-28 16:41:40 +00:00
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2001-10-27 12:13:17 +00:00
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void subnet_add(node_t *n, subnet_t *subnet)
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2000-11-20 19:12:17 +00:00
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{
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cp
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2001-10-27 12:13:17 +00:00
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subnet->owner = n;
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2001-06-06 19:11:16 +00:00
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2001-10-27 12:13:17 +00:00
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avl_insert(subnet_tree, subnet);
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cp
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avl_insert(n->subnet_tree, subnet);
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2000-11-20 19:12:17 +00:00
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cp
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}
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2000-10-11 10:35:17 +00:00
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2001-10-27 12:13:17 +00:00
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void subnet_del(node_t *n, subnet_t *subnet)
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2000-11-20 19:12:17 +00:00
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{
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cp
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2001-10-27 12:13:17 +00:00
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avl_delete(n->subnet_tree, subnet);
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2000-11-24 23:13:07 +00:00
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cp
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2001-01-05 23:53:53 +00:00
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avl_delete(subnet_tree, subnet);
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2000-10-01 03:21:49 +00:00
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cp
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}
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/* Ascii representation of subnets */
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subnet_t *str2net(char *subnetstr)
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{
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2000-10-11 10:35:17 +00:00
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int type;
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subnet_t *subnet;
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2000-10-01 03:21:49 +00:00
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cp
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2000-10-11 10:35:17 +00:00
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if(sscanf(subnetstr, "%d,", &type) != 1)
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return NULL;
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2000-10-28 21:05:20 +00:00
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cp
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2000-10-11 10:35:17 +00:00
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subnet = new_subnet();
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2000-10-28 21:05:20 +00:00
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cp
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2000-10-11 10:35:17 +00:00
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switch(type)
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{
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case SUBNET_MAC:
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2000-10-11 22:01:02 +00:00
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if(sscanf(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type,
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&subnet->net.mac.address.x[0],
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&subnet->net.mac.address.x[1],
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&subnet->net.mac.address.x[2],
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&subnet->net.mac.address.x[3],
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&subnet->net.mac.address.x[4],
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&subnet->net.mac.address.x[5]) != 7)
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2000-10-11 10:35:17 +00:00
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{
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free_subnet(subnet);
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return NULL;
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}
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break;
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2000-10-11 22:01:02 +00:00
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case SUBNET_IPV4:
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2000-10-24 15:46:18 +00:00
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if(sscanf(subnetstr, "%d,%lx/%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3)
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2000-10-11 10:35:17 +00:00
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{
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free_subnet(subnet);
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return NULL;
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}
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break;
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2000-10-11 22:01:02 +00:00
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case SUBNET_IPV6:
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if(sscanf(subnetstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type,
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2000-10-11 10:35:17 +00:00
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&subnet->net.ipv6.address.x[0],
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&subnet->net.ipv6.address.x[1],
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&subnet->net.ipv6.address.x[2],
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&subnet->net.ipv6.address.x[3],
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&subnet->net.ipv6.address.x[4],
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&subnet->net.ipv6.address.x[5],
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&subnet->net.ipv6.address.x[6],
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&subnet->net.ipv6.address.x[7],
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&subnet->net.ipv6.mask.x[0],
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&subnet->net.ipv6.mask.x[1],
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&subnet->net.ipv6.mask.x[2],
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&subnet->net.ipv6.mask.x[3],
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&subnet->net.ipv6.mask.x[4],
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&subnet->net.ipv6.mask.x[5],
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&subnet->net.ipv6.mask.x[6],
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&subnet->net.ipv6.mask.x[7]) != 17)
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{
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free_subnet(subnet);
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return NULL;
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}
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break;
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default:
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free_subnet(subnet);
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return NULL;
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2000-10-11 22:01:02 +00:00
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}
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2000-10-01 03:21:49 +00:00
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cp
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2000-10-11 10:35:17 +00:00
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return subnet;
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2000-10-01 03:21:49 +00:00
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}
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char *net2str(subnet_t *subnet)
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{
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2000-10-11 10:35:17 +00:00
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char *netstr;
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2000-10-01 03:21:49 +00:00
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cp
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2000-10-11 10:35:17 +00:00
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switch(subnet->type)
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{
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case SUBNET_MAC:
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2000-10-15 00:59:37 +00:00
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asprintf(&netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type,
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2000-10-11 22:01:02 +00:00
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subnet->net.mac.address.x[0],
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subnet->net.mac.address.x[1],
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subnet->net.mac.address.x[2],
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subnet->net.mac.address.x[3],
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subnet->net.mac.address.x[4],
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subnet->net.mac.address.x[5]);
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2000-10-28 21:05:20 +00:00
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break;
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2000-10-11 22:01:02 +00:00
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case SUBNET_IPV4:
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2000-10-24 15:46:18 +00:00
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asprintf(&netstr, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
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2000-10-28 21:05:20 +00:00
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break;
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2000-10-11 22:01:02 +00:00
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case SUBNET_IPV6:
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2000-11-04 11:49:58 +00:00
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asprintf(&netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", subnet->type,
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2000-10-11 10:35:17 +00:00
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subnet->net.ipv6.address.x[0],
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subnet->net.ipv6.address.x[1],
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subnet->net.ipv6.address.x[2],
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subnet->net.ipv6.address.x[3],
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subnet->net.ipv6.address.x[4],
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subnet->net.ipv6.address.x[5],
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subnet->net.ipv6.address.x[6],
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subnet->net.ipv6.address.x[7],
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subnet->net.ipv6.mask.x[0],
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subnet->net.ipv6.mask.x[1],
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subnet->net.ipv6.mask.x[2],
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subnet->net.ipv6.mask.x[3],
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subnet->net.ipv6.mask.x[4],
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subnet->net.ipv6.mask.x[5],
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subnet->net.ipv6.mask.x[6],
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subnet->net.ipv6.mask.x[7]);
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2000-10-28 21:05:20 +00:00
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break;
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2000-10-11 10:35:17 +00:00
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default:
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2001-06-05 16:09:55 +00:00
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asprintf(&netstr, _("unknown subnet type"));
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2000-10-11 10:35:17 +00:00
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}
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2000-10-01 03:21:49 +00:00
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cp
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2000-10-11 10:35:17 +00:00
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return netstr;
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2000-10-01 03:21:49 +00:00
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}
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/* Subnet lookup routines */
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2000-10-11 10:35:17 +00:00
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2001-10-27 12:13:17 +00:00
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subnet_t *lookup_subnet(node_t *owner, subnet_t *subnet)
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|
|
|
{
|
|
|
|
cp
|
|
|
|
return avl_search(owner->subnet_tree, subnet);
|
|
|
|
}
|
|
|
|
|
2001-01-05 23:53:53 +00:00
|
|
|
subnet_t *lookup_subnet_mac(mac_t *address)
|
2000-10-11 10:35:17 +00:00
|
|
|
{
|
2000-11-24 23:13:07 +00:00
|
|
|
subnet_t subnet, *p;
|
2000-10-11 10:35:17 +00:00
|
|
|
cp
|
2000-11-20 19:12:17 +00:00
|
|
|
subnet.type = SUBNET_MAC;
|
2001-01-05 23:53:53 +00:00
|
|
|
memcpy(&subnet.net.mac.address, address, sizeof(mac_t));
|
2000-11-24 23:13:07 +00:00
|
|
|
|
2001-01-05 23:53:53 +00:00
|
|
|
p = (subnet_t *)avl_search(subnet_tree, &subnet);
|
2000-11-24 23:13:07 +00:00
|
|
|
cp
|
2001-01-05 23:53:53 +00:00
|
|
|
return p;
|
2000-10-11 10:35:17 +00:00
|
|
|
}
|
|
|
|
|
2001-01-05 23:53:53 +00:00
|
|
|
subnet_t *lookup_subnet_ipv4(ipv4_t *address)
|
2000-10-11 10:35:17 +00:00
|
|
|
{
|
2000-11-24 23:13:07 +00:00
|
|
|
subnet_t subnet, *p;
|
2000-10-11 10:35:17 +00:00
|
|
|
cp
|
2000-11-20 19:12:17 +00:00
|
|
|
subnet.type = SUBNET_IPV4;
|
2001-01-05 23:53:53 +00:00
|
|
|
subnet.net.ipv4.address = *address;
|
2000-11-20 19:12:17 +00:00
|
|
|
subnet.net.ipv4.mask = 0xFFFFFFFF;
|
2000-11-24 23:13:07 +00:00
|
|
|
|
2001-06-01 08:02:09 +00:00
|
|
|
do
|
|
|
|
{
|
|
|
|
/* Go find subnet */
|
|
|
|
|
|
|
|
p = (subnet_t *)avl_search_closest_smaller(subnet_tree, &subnet);
|
2000-11-24 23:13:07 +00:00
|
|
|
|
|
|
|
/* Check if the found subnet REALLY matches */
|
|
|
|
cp
|
2001-06-01 08:02:09 +00:00
|
|
|
if(p)
|
|
|
|
{
|
|
|
|
if ((*address & p->net.ipv4.mask) == p->net.ipv4.address)
|
|
|
|
break;
|
|
|
|
else
|
|
|
|
{
|
|
|
|
/* Otherwise, see if there is a bigger enclosing subnet */
|
|
|
|
|
|
|
|
subnet.net.ipv4.mask = p->net.ipv4.mask << 1;
|
2001-06-05 18:07:14 +00:00
|
|
|
subnet.net.ipv4.address = p->net.ipv4.address & subnet.net.ipv4.mask;
|
2001-06-01 08:02:09 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
} while (p);
|
|
|
|
|
|
|
|
return p;
|
2000-10-11 10:35:17 +00:00
|
|
|
}
|
|
|
|
|
2001-01-05 23:53:53 +00:00
|
|
|
subnet_t *lookup_subnet_ipv6(ipv6_t *address)
|
2000-10-11 10:35:17 +00:00
|
|
|
{
|
2001-01-07 20:19:08 +00:00
|
|
|
subnet_t subnet, *p;
|
|
|
|
int i;
|
2000-10-11 10:35:17 +00:00
|
|
|
cp
|
2000-11-20 19:12:17 +00:00
|
|
|
subnet.type = SUBNET_IPV6;
|
2001-01-05 23:53:53 +00:00
|
|
|
memcpy(&subnet.net.ipv6.address, address, sizeof(ipv6_t));
|
2000-11-20 19:12:17 +00:00
|
|
|
memset(&subnet.net.ipv6.mask, 0xFF, 16);
|
2000-11-24 23:13:07 +00:00
|
|
|
|
2001-01-07 20:19:08 +00:00
|
|
|
p = (subnet_t *)avl_search_closest_greater(subnet_tree, &subnet);
|
|
|
|
|
|
|
|
if(p)
|
|
|
|
for(i=0; i<8; i++)
|
|
|
|
if((address->x[i] & p->net.ipv6.address.x[i]) != p->net.ipv6.address.x[i])
|
|
|
|
return NULL;
|
2000-11-24 23:13:07 +00:00
|
|
|
|
2001-01-07 20:19:08 +00:00
|
|
|
return p;
|
2000-10-11 10:35:17 +00:00
|
|
|
}
|
2000-10-28 21:05:20 +00:00
|
|
|
|
2001-10-27 13:13:35 +00:00
|
|
|
void dump_subnets(void)
|
2000-10-28 21:05:20 +00:00
|
|
|
{
|
|
|
|
char *netstr;
|
2000-11-20 19:12:17 +00:00
|
|
|
subnet_t *subnet;
|
2001-01-05 23:53:53 +00:00
|
|
|
avl_node_t *node;
|
2000-10-28 21:05:20 +00:00
|
|
|
cp
|
|
|
|
syslog(LOG_DEBUG, _("Subnet list:"));
|
2001-01-05 23:53:53 +00:00
|
|
|
for(node = subnet_tree->head; node; node = node->next)
|
2000-10-28 21:05:20 +00:00
|
|
|
{
|
2001-01-05 23:53:53 +00:00
|
|
|
subnet = (subnet_t *)node->data;
|
2000-10-28 21:05:20 +00:00
|
|
|
netstr = net2str(subnet);
|
2000-11-04 22:57:33 +00:00
|
|
|
syslog(LOG_DEBUG, " %s owner %s", netstr, subnet->owner->name);
|
2000-10-28 21:05:20 +00:00
|
|
|
free(netstr);
|
|
|
|
}
|
|
|
|
syslog(LOG_DEBUG, _("End of subnet list."));
|
|
|
|
cp
|
|
|
|
}
|