+++ /dev/null
-/*
- subnet.c -- handle subnet lookups and lists
- Copyright (C) 2000-2002 Guus Sliepen <guus@sliepen.warande.net>,
- 2000-2002 Ivo Timmermans <itimmermans@bigfoot.com>
-
- 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: subnet.c,v 1.1 2002/04/28 12:46:26 zarq Exp $
-*/
-
-#include "config.h"
-
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <netdb.h>
-#include <netinet/in.h>
-
-#include <hooks.h>
-#include <utils.h>
-#include <xalloc.h>
-#include <avl_tree.h>
-
-#include "conf.h"
-#include "net.h"
-#include "node.h"
-#include "subnet.h"
-#include "netutl.h"
-#include "logging.h"
-
-#include "system.h"
-
-/* lists type of subnet */
-
-avl_tree_t *subnet_tree;
-
-/* Subnet comparison */
-
-int subnet_compare_mac(subnet_t *a, subnet_t *b)
-{
-cp
- return memcmp(&a->net.mac.address, &b->net.mac.address, sizeof(mac_t));
-}
-
-int subnet_compare_ipv4(subnet_t *a, subnet_t *b)
-{
- int result;
-cp
- result = memcmp(&a->net.ipv4.address, &b->net.ipv4.address, sizeof(ipv4_t));
-
- if(result)
- return result;
-
- return a->net.ipv4.prefixlength - b->net.ipv4.prefixlength;
-}
-
-int subnet_compare_ipv6(subnet_t *a, subnet_t *b)
-{
- int result;
-cp
- result = memcmp(&a->net.ipv6.address, &b->net.ipv6.address, sizeof(ipv6_t));
-
- if(result)
- return result;
-
- return a->net.ipv6.prefixlength - b->net.ipv6.prefixlength;
-}
-
-int subnet_compare(subnet_t *a, subnet_t *b)
-{
- int result;
-cp
- result = a->type - b->type;
-
- if(result)
- return result;
-
- switch(a->type)
- {
- case SUBNET_MAC:
- return subnet_compare_mac(a, b);
- case SUBNET_IPV4:
- return subnet_compare_ipv4(a, b);
- case SUBNET_IPV6:
- return subnet_compare_ipv6(a, b);
- default:
- syslog(LOG_ERR, _("subnet_compare() was called with unknown subnet type %d, exitting!"), a->type);
- cp_trace();
- exit(0);
- }
-
- return 0;
-}
-
-/* Initialising trees */
-
-void init_subnets(void)
-{
-cp
- subnet_tree = avl_alloc_tree((avl_compare_t)subnet_compare, (avl_action_t)free_subnet);
-cp
-}
-
-void exit_subnets(void)
-{
-cp
- avl_delete_tree(subnet_tree);
-cp
-}
-
-avl_tree_t *new_subnet_tree(void)
-{
-cp
- return avl_alloc_tree((avl_compare_t)subnet_compare, NULL);
-cp
-}
-
-void free_subnet_tree(avl_tree_t *subnet_tree)
-{
-cp
- avl_delete_tree(subnet_tree);
-cp
-}
-
-/* Allocating and freeing space for subnets */
-
-subnet_t *new_subnet(void)
-{
-cp
- return (subnet_t *)xmalloc(sizeof(subnet_t));
-}
-
-void free_subnet(subnet_t *subnet)
-{
-cp
- free(subnet);
-}
-
-/* Adding and removing subnets */
-
-void subnet_add(node_t *n, subnet_t *subnet)
-{
-cp
- subnet->owner = n;
-
- avl_insert(subnet_tree, subnet);
-cp
- avl_insert(n->subnet_tree, subnet);
-
- run_hooks("subnet-add", subnet);
-cp
-}
-
-void subnet_del(node_t *n, subnet_t *subnet)
-{
-cp
- avl_delete(n->subnet_tree, subnet);
-cp
- avl_delete(subnet_tree, subnet);
-
- run_hooks("subnet-del", subnet);
-cp
-}
-
-/* Ascii representation of subnets */
-
-subnet_t *str2net(char *subnetstr)
-{
- int i, l;
- subnet_t *subnet;
- unsigned short int x[8];
-cp
- subnet = new_subnet();
-cp
- if(sscanf(subnetstr, "%hu.%hu.%hu.%hu/%d",
- &x[0], &x[1], &x[2], &x[3],
- &l) == 5)
- {
- subnet->type = SUBNET_IPV4;
- subnet->net.ipv4.prefixlength = l;
- for(i = 0; i < 4; i++)
- subnet->net.ipv4.address.x[i] = x[i];
- return subnet;
- }
-
- if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%d",
- &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &x[6], &x[7],
- &l) == 9)
- {
- subnet->type = SUBNET_IPV6;
- subnet->net.ipv6.prefixlength = l;
- for(i = 0; i < 8; i++)
- subnet->net.ipv6.address.x[i] = htons(x[i]);
- return subnet;
- }
-
- if(sscanf(subnetstr, "%hu.%hu.%hu.%hu",
- &x[0], &x[1], &x[2], &x[3]) == 4)
- {
- subnet->type = SUBNET_IPV4;
- subnet->net.ipv4.prefixlength = 32;
- for(i = 0; i < 4; i++)
- subnet->net.ipv4.address.x[i] = x[i];
- return subnet;
- }
-
- if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
- &x[0], &x[1], &x[2], &x[3], &x[4], &x[5], &x[6], &x[7]) == 8)
- {
- subnet->type = SUBNET_IPV6;
- subnet->net.ipv6.prefixlength = 128;
- for(i = 0; i < 8; i++)
- subnet->net.ipv6.address.x[i] = htons(x[i]);
- return subnet;
- }
-
- if(sscanf(subnetstr, "%hx:%hx:%hx:%hx:%hx:%hx",
- &x[0], &x[1], &x[2], &x[3], &x[4], &x[5]) == 6)
- {
- subnet->type = SUBNET_MAC;
- for(i = 0; i < 6; i++)
- subnet->net.mac.address.x[i] = x[i];
- return subnet;
- }
-
- free(subnet);
- return NULL;
-}
-
-char *net2str(subnet_t *subnet)
-{
- char *netstr;
-cp
- switch(subnet->type)
- {
- case SUBNET_MAC:
- asprintf(&netstr, "%hx:%hx:%hx:%hx:%hx:%hx",
- subnet->net.mac.address.x[0],
- subnet->net.mac.address.x[1],
- subnet->net.mac.address.x[2],
- subnet->net.mac.address.x[3],
- subnet->net.mac.address.x[4],
- subnet->net.mac.address.x[5]);
- break;
- case SUBNET_IPV4:
- asprintf(&netstr, "%hu.%hu.%hu.%hu/%d",
- subnet->net.ipv4.address.x[0],
- subnet->net.ipv4.address.x[1],
- subnet->net.ipv4.address.x[2],
- subnet->net.ipv4.address.x[3],
- subnet->net.ipv4.prefixlength);
- break;
- case SUBNET_IPV6:
- asprintf(&netstr, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%d",
- ntohs(subnet->net.ipv6.address.x[0]),
- ntohs(subnet->net.ipv6.address.x[1]),
- ntohs(subnet->net.ipv6.address.x[2]),
- ntohs(subnet->net.ipv6.address.x[3]),
- ntohs(subnet->net.ipv6.address.x[4]),
- ntohs(subnet->net.ipv6.address.x[5]),
- ntohs(subnet->net.ipv6.address.x[6]),
- ntohs(subnet->net.ipv6.address.x[7]),
- subnet->net.ipv6.prefixlength);
- break;
- default:
- syslog(LOG_ERR, _("net2str() was called with unknown subnet type %d, exitting!"), subnet->type);
- cp_trace();
- exit(0);
- }
-cp
- return netstr;
-}
-
-/* Subnet lookup routines */
-
-subnet_t *lookup_subnet(node_t *owner, subnet_t *subnet)
-{
-cp
- return avl_search(owner->subnet_tree, subnet);
-}
-
-subnet_t *lookup_subnet_mac(mac_t *address)
-{
- subnet_t subnet, *p;
-cp
- subnet.type = SUBNET_MAC;
- memcpy(&subnet.net.mac.address, address, sizeof(mac_t));
-
- p = (subnet_t *)avl_search(subnet_tree, &subnet);
-cp
- return p;
-}
-
-subnet_t *lookup_subnet_ipv4(ipv4_t *address)
-{
- subnet_t subnet, *p;
-cp
- subnet.type = SUBNET_IPV4;
- memcpy(&subnet.net.ipv4.address, address, sizeof(ipv4_t));
- subnet.net.ipv4.prefixlength = 32;
-
- do
- {
- /* Go find subnet */
-
- p = (subnet_t *)avl_search_closest_smaller(subnet_tree, &subnet);
-
- /* Check if the found subnet REALLY matches */
-cp
- if(p)
- {
- if(p->type != SUBNET_IPV4)
- {
- p = NULL;
- break;
- }
-
- if (!maskcmp((char *)address, (char *)&p->net.ipv4.address, p->net.ipv4.prefixlength, sizeof(ipv4_t)))
- break;
- else
- {
- /* Otherwise, see if there is a bigger enclosing subnet */
-
- subnet.net.ipv4.prefixlength = p->net.ipv4.prefixlength - 1;
- maskcpy((char *)&subnet.net.ipv4.address, (char *)&p->net.ipv4.address, subnet.net.ipv4.prefixlength, sizeof(ipv4_t));
- }
- }
- } while (p);
-cp
- return p;
-}
-
-subnet_t *lookup_subnet_ipv6(ipv6_t *address)
-{
- subnet_t subnet, *p;
-cp
- subnet.type = SUBNET_IPV6;
- memcpy(&subnet.net.ipv6.address, address, sizeof(ipv6_t));
- subnet.net.ipv6.prefixlength = 128;
-
- do
- {
- /* Go find subnet */
-
- p = (subnet_t *)avl_search_closest_smaller(subnet_tree, &subnet);
-
- /* Check if the found subnet REALLY matches */
-
-cp
- if(p)
- {
- if(p->type != SUBNET_IPV6)
- return NULL;
-
- if (!maskcmp((char *)address, (char *)&p->net.ipv6.address, p->net.ipv6.prefixlength, sizeof(ipv6_t)))
- break;
- else
- {
- /* Otherwise, see if there is a bigger enclosing subnet */
-
- subnet.net.ipv6.prefixlength = p->net.ipv6.prefixlength - 1;
- maskcpy((char *)&subnet.net.ipv6.address, (char *)&p->net.ipv6.address, subnet.net.ipv6.prefixlength, sizeof(ipv6_t));
- }
- }
- } while (p);
-cp
- return p;
-}
-
-void dump_subnets(void)
-{
- char *netstr;
- subnet_t *subnet;
- avl_node_t *node;
-cp
- syslog(LOG_DEBUG, _("Subnet list:"));
- for(node = subnet_tree->head; node; node = node->next)
- {
- subnet = (subnet_t *)node->data;
- netstr = net2str(subnet);
- syslog(LOG_DEBUG, _(" %s owner %s"), netstr, subnet->owner->name);
- free(netstr);
- }
- syslog(LOG_DEBUG, _("End of subnet list."));
-cp
-}
projects / tinc / blobdiff