309 lines
8.2 KiB
C
309 lines
8.2 KiB
C
/*
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subnet.c -- handle subnet lookups and lists
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Copyright (C) 2000 Guus Sliepen <guus@sliepen.warande.net>,
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2000 Ivo Timmermans <itimmermans@bigfoot.com>
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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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$Id: subnet.c,v 1.1.2.8 2000/10/29 00:02:20 guus Exp $
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*/
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#include <syslog.h>
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#include <stdio.h>
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#include "config.h"
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#include <utils.h>
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#include <xalloc.h>
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#include "subnet.h"
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#include "net.h"
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#include "conf.h"
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#include "system.h"
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/* lists type of subnet */
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subnet_t *subnet_list[SUBNET_TYPES] = { NULL };
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/* Allocating and freeing space for subnets */
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subnet_t *new_subnet(void)
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{
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cp
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return (subnet_t *)xmalloc(sizeof(subnet_t));
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}
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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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/* Linked list management */
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void subnet_add(conn_list_t *cl, subnet_t *subnet)
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{
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subnet_t *p = NULL;
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subnet_t *q = NULL;
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cp
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subnet->owner = cl;
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/* Link it into the owners list of subnets (unsorted) */
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subnet->next = cl->subnets;
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subnet->prev = NULL;
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if(subnet->next)
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subnet->next->prev = subnet;
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cl->subnets = subnet;
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/* And now add it to the global subnet list (sorted) */
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/* Sort on size of subnet mask (IPv4 only at the moment!)
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Three cases: subnet_list[] = NULL -> just add this subnet
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insert before first -> add it in front of list
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rest: insert after another subnet
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*/
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cp
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if(subnet_list[subnet->type])
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{
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p = q = subnet_list[subnet->type];
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for(; p; p = p->global_next)
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{
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if(subnet->net.ipv4.mask >= p->net.ipv4.mask)
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break;
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q = p;
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}
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}
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cp
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if(p == subnet_list[subnet->type]) /* First two cases */
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{
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/* Insert in front */
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subnet->global_next = subnet_list[subnet->type];
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subnet->global_prev = NULL;
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subnet_list[subnet->type] = subnet;
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}
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else /* Third case */
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{
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/* Insert after q */
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subnet->global_next = q->global_next;
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subnet->global_prev = q;
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q->global_next = subnet;
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}
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cp
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if(subnet->global_next)
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subnet->global_next->global_prev = subnet;
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cp
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}
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void subnet_del(subnet_t *subnet)
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{
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cp
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/* Remove it from owner's list */
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if(subnet->prev)
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subnet->prev->next = subnet->next;
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else
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subnet->owner->subnets = subnet->next;
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if(subnet->next)
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subnet->next->prev = subnet->prev;
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/* Remove it from the global list */
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if(subnet->global_prev)
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subnet->global_prev->global_next = subnet->global_next;
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else
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subnet_list[subnet->type] = subnet->global_next;
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if(subnet->global_next)
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subnet->global_next->global_prev = subnet->global_prev;
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free_subnet(subnet);
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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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int type;
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subnet_t *subnet;
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cp
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if(sscanf(subnetstr, "%d,", &type) != 1)
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return NULL;
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cp
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subnet = new_subnet();
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cp
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switch(type)
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{
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case SUBNET_MAC:
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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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{
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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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case SUBNET_IPV4:
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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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{
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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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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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&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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}
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cp
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return subnet;
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}
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char *net2str(subnet_t *subnet)
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{
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char *netstr;
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cp
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switch(subnet->type)
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{
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case SUBNET_MAC:
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asprintf(&netstr, "%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]);
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break;
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case SUBNET_IPV4:
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asprintf(&netstr, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
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break;
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case SUBNET_IPV6:
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asprintf(&netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
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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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break;
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default:
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asprintf(&netstr, _("unknown"));
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}
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cp
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return netstr;
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}
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/* Subnet lookup routines */
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subnet_t *lookup_subnet_mac(mac_t address)
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{
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subnet_t *subnet;
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cp
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for(subnet = subnet_list[SUBNET_MAC]; subnet != NULL; subnet = subnet->global_next)
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{
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if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0)
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break;
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}
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cp
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return subnet;
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}
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subnet_t *lookup_subnet_ipv4(ipv4_t address)
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{
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subnet_t *subnet;
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cp
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for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next)
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{
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if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address)
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break;
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}
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cp
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return subnet;
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}
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subnet_t *lookup_subnet_ipv6(ipv6_t address)
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{
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subnet_t *subnet;
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int i;
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cp
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for(subnet = subnet_list[SUBNET_IPV6]; subnet != NULL; subnet = subnet->global_next)
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{
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for(i=0; i<8; i++)
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if((address.x[i] & subnet->net.ipv6.mask.x[i]) != subnet->net.ipv6.address.x[i])
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break;
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if(i == 8)
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break;
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}
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cp
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return subnet;
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}
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void dump_subnet_list(void)
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{
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subnet_t *subnet;
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char *netstr;
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cp
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syslog(LOG_DEBUG, _("Subnet list:"));
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for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next)
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{
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netstr = net2str(subnet);
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syslog(LOG_DEBUG, " %s owner %s", netstr, subnet->owner->name);
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free(netstr);
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}
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syslog(LOG_DEBUG, _("End of subnet list."));
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cp
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}
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