/*
subnet.c -- handle subnet lookups and lists
- Copyright (C) 2000 Guus Sliepen <guus@sliepen.warande.net>,
- 2000 Ivo Timmermans <itimmermans@bigfoot.com>
+ 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
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: subnet.c,v 1.1.2.1 2000/10/01 03:21:49 guus Exp $
+ $Id: subnet.c,v 1.1.2.32 2002/03/11 11:23:04 guus Exp $
*/
#include "config.h"
-#include "subnet.h"
+
+#include <stdio.h>
+#include <syslog.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <netinet/in.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 "system.h"
+
+int cache_mac_valid = 0;
+int cache_ipv4_valid = 0;
+int cache_ipv6_valid = 0;
+
+/* 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.masklength - b->net.ipv4.masklength;
+}
+
+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.masklength - b->net.ipv6.masklength;
+}
+
+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
-cp
+ return (subnet_t *)xmalloc(sizeof(subnet_t));
}
void free_subnet(subnet_t *subnet)
{
cp
-cp
+ free(subnet);
}
-/* Linked list management */
+/* Adding and removing subnets */
-int subnet_add(conn_list_t *cl, subnet_t *subnet)
+void cache_invalidate(void)
{
+ cache_mac_valid = 0;
+ cache_ipv4_valid = 0;
+ cache_ipv6_valid = 0;
+}
+
+void subnet_add(node_t *n, subnet_t *subnet)
+{
+cp
+ subnet->owner = n;
+
+ cache_invalidate();
+
+ avl_insert(subnet_tree, subnet);
cp
- subnet->next = cl->subnets->next;
- subnet->prev = NULL;
- subnet->next->prev = subnet
- cl->subnets = subnet;
+ avl_insert(n->subnet_tree, subnet);
cp
- return 0;
}
-int subnet_del(conn_list_t *cl, subnet_t *subnet)
+void subnet_del(node_t *n, subnet_t *subnet)
{
cp
- if(subnet->prev)
- {
- subnet->prev->next = subnet->next;
- }
- else
- {
- subnet->owner->subnets = subnet->next;
- }
-
- subnet->next->prev = subnet->prev;
- free_subnet(subnet);
+ cache_invalidate();
+
+ avl_delete(n->subnet_tree, subnet);
+cp
+ avl_delete(subnet_tree, subnet);
cp
- return 0;
}
/* 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.masklength = 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.masklength = 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.masklength = 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.masklength = 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.masklength);
+ 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.masklength);
+ 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)
+{
+ static subnet_t subnet, *p;
+cp
+ if(cache_mac_valid && !memcmp(&subnet.net.mac.address, address, sizeof(mac_t)))
+ return p;
+
+ subnet.type = SUBNET_MAC;
+ memcpy(&subnet.net.mac.address, address, sizeof(mac_t));
+
+ p = (subnet_t *)avl_search(subnet_tree, &subnet);
+ cache_mac_valid = 1;
+cp
+ return p;
+}
+
+subnet_t *lookup_subnet_ipv4(ipv4_t *address)
+{
+ static subnet_t subnet, *p;
+cp
+ if(cache_ipv4_valid && !memcmp(&subnet.net.ipv4.address, address, sizeof(ipv4_t)))
+ return p;
+
+ subnet.type = SUBNET_IPV4;
+ memcpy(&subnet.net.ipv4.address, address, sizeof(ipv4_t));
+ subnet.net.ipv4.masklength = 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.masklength, sizeof(ipv4_t)))
+ break;
+ else
+ {
+ /* Otherwise, see if there is a bigger enclosing subnet */
+
+ subnet.net.ipv4.masklength = p->net.ipv4.masklength - 1;
+ maskcpy((char *)&subnet.net.ipv4.address, (char *)&p->net.ipv4.address, subnet.net.ipv4.masklength, sizeof(ipv4_t));
+ }
+ }
+ } while (p);
+
+ memcpy(&subnet.net.ipv4.address, address, sizeof(ipv4_t));
+ cache_ipv4_valid = 1;
+cp
+ return p;
+}
+
+subnet_t *lookup_subnet_ipv6(ipv6_t *address)
+{
+ static subnet_t subnet, *p;
+cp
+ if(cache_ipv6_valid && !memcmp(&subnet.net.ipv6.address, address, sizeof(ipv6_t)))
+ return p;
+
+ subnet.type = SUBNET_IPV6;
+ memcpy(&subnet.net.ipv6.address, address, sizeof(ipv6_t));
+ subnet.net.ipv6.masklength = 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.masklength, sizeof(ipv6_t)))
+ break;
+ else
+ {
+ /* Otherwise, see if there is a bigger enclosing subnet */
+
+ subnet.net.ipv6.masklength = p->net.ipv6.masklength - 1;
+ maskcpy((char *)&subnet.net.ipv6.address, (char *)&p->net.ipv6.address, subnet.net.ipv6.masklength, sizeof(ipv6_t));
+ }
+ }
+ } while (p);
+
+ memcpy(&subnet.net.ipv6.address, address, sizeof(ipv6_t));
+ cache_ipv6_valid = 1;
+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