tinc-vpn.org Git - tinc/blob - src/subnet.c

   1 /*
   2     subnet.c -- handle subnet lookups and lists
   3     Copyright (C) 2000 Guus Sliepen <guus@sliepen.warande.net>,
   4                   2000 Ivo Timmermans <itimmermans@bigfoot.com>
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19
  20     $Id: subnet.c,v 1.1.2.2 2000/10/11 10:35:17 guus Exp $
  21 */
  22
  23 #include "config.h"
  24 #include <utils.h>
  25
  26 #include <xalloc.h>
  27 #include "subnet.h"
  28 #include "net.h"
  29
  30 /* Allocating and freeing space for subnets */
  31
  32 subnet_t *new_subnet(void)
  33 {
  34 cp
  35   return (subnet_t *)xmalloc(sizeof(subnet_t));
  36 }
  37
  38 void free_subnet(subnet_t *subnet)
  39 {
  40 cp
  41   free(subnet);
  42 }
  43
  44 /* Linked list management */
  45
  46 void subnet_add(conn_list_t *cl, subnet_t *subnet)
  47 {
  48 cp
  49   /* FIXME: do sorting on netmask size if necessary */
  50
  51   subnet->next = cl->subnets->next;
  52   subnet->prev = NULL;
  53   subnet->next->prev = subnet;
  54   cl->subnets = subnet;
  55 cp
  56 }
  57
  58 void subnet_del(conn_list_t *cl, subnet_t *subnet)
  59 {
  60 cp
  61   if(subnet->prev)
  62     {
  63       subnet->prev->next = subnet->next;
  64     }
  65   else
  66     {
  67       subnet->owner->subnets = subnet->next;
  68     }
  69
  70   subnet->next->prev = subnet->prev;
  71   free_subnet(subnet);
  72 cp
  73 }
  74
  75 /* Ascii representation of subnets */
  76
  77 subnet_t *str2net(char *subnetstr)
  78 {
  79   int type;
  80   subnet_t *subnet;
  81 cp
  82   if(sscanf(subnetstr, "%d,", &type) != 1)
  83     return NULL;
  84
  85   subnet = new_subnet();
  86
  87   switch(type)
  88     {
  89       case SUBNET_MAC:
  90         if(sscanf(netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type,
  91                    &subnet->net.mac.x[0],
  92                    &subnet->net.mac.x[1],
  93                    &subnet->net.mac.x[2],
  94                    &subnet->net.mac.x[3],
  95                    &subnet->net.mac.x[4],
  96                    &subnet->net.mac.x[5]) != 7)
  97           {
  98             free_subnet(subnet);
  99             return NULL;
 100           }
 101         break;
 102       case SUBNET_IPv4:
 103         if(sscanf(subnetstr, "%d,%lx:%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3)
 104           {
 105             free_subnet(subnet);
 106             return NULL;
 107           }
 108         break;
 109       case SUBNET_IPv6:
 110         if(sscanf(netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type,
 111                    &subnet->net.ipv6.address.x[0],
 112                    &subnet->net.ipv6.address.x[1],
 113                    &subnet->net.ipv6.address.x[2],
 114                    &subnet->net.ipv6.address.x[3],
 115                    &subnet->net.ipv6.address.x[4],
 116                    &subnet->net.ipv6.address.x[5],
 117                    &subnet->net.ipv6.address.x[6],
 118                    &subnet->net.ipv6.address.x[7],
 119                    &subnet->net.ipv6.mask.x[0],
 120                    &subnet->net.ipv6.mask.x[1],
 121                    &subnet->net.ipv6.mask.x[2],
 122                    &subnet->net.ipv6.mask.x[3],
 123                    &subnet->net.ipv6.mask.x[4],
 124                    &subnet->net.ipv6.mask.x[5],
 125                    &subnet->net.ipv6.mask.x[6],
 126                    &subnet->net.ipv6.mask.x[7]) != 17)
 127           {
 128             free_subnet(subnet);
 129             return NULL;
 130           }
 131         break;
 132                 break;
 133       default:
 134         free_subnet(subnet);
 135         return NULL;
 136 cp
 137   return subnet;
 138 }
 139
 140 char *net2str(subnet_t *subnet)
 141 {
 142   char *netstr;
 143 cp
 144   switch(subnet->type)
 145     {
 146       case SUBNET_MAC:
 147         asprintf(netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type,
 148                    subnet->net.mac.x[0],
 149                    subnet->net.mac.x[1],
 150                    subnet->net.mac.x[2],
 151                    subnet->net.mac.x[3],
 152                    subnet->net.mac.x[4],
 153                    subnet->net.mac.x[5]);
 154       case SUBNET_IPv4:
 155         asprintf(netstr, "%d,%lx:%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
 156       case SUBNET_IPv6:
 157         asprintf(netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
 158                    subnet->net.ipv6.address.x[0],
 159                    subnet->net.ipv6.address.x[1],
 160                    subnet->net.ipv6.address.x[2],
 161                    subnet->net.ipv6.address.x[3],
 162                    subnet->net.ipv6.address.x[4],
 163                    subnet->net.ipv6.address.x[5],
 164                    subnet->net.ipv6.address.x[6],
 165                    subnet->net.ipv6.address.x[7],
 166                    subnet->net.ipv6.mask.x[0],
 167                    subnet->net.ipv6.mask.x[1],
 168                    subnet->net.ipv6.mask.x[2],
 169                    subnet->net.ipv6.mask.x[3],
 170                    subnet->net.ipv6.mask.x[4],
 171                    subnet->net.ipv6.mask.x[5],
 172                    subnet->net.ipv6.mask.x[6],
 173                    subnet->net.ipv6.mask.x[7]);
 174       default:
 175         netstr = NULL;
 176     }
 177 cp
 178   return netstr;
 179 }
 180
 181 /* Subnet lookup routines */
 182
 183 subnet_t *lookup_subnet_mac(subnet_t *subnets, mac_t address)
 184 {
 185   subnet_t *subnet;
 186 cp
 187   for(subnet = subnets; subnet != NULL; subnet = subnet->next)
 188     {
 189       if(subnet->type == SUBNET_MAC)
 190         if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0)
 191           break;
 192     }
 193 cp
 194   return subnet;
 195 }
 196
 197 subnet_t *lookup_subnet_ipv4(subnet_t *subnets, ipv4_t address)
 198 {
 199   subnet_t *subnet;
 200 cp
 201   for(subnet = subnets; subnet != NULL; subnet = subnet->next)
 202     {
 203       if(subnet->type == SUBNET_IPV4)
 204         if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address)
 205           break;
 206     }
 207 cp
 208   return subnet;
 209 }
 210
 211 subnet_t *lookup_subnet_ipv6(subnet_t *subnets, ipv6_t address)
 212 {
 213   subnet_t *subnet;
 214 cp
 215   for(subnet = subnets; subnet != NULL; subnet = subnet->next)
 216     {
 217       if(subnet->type == SUBNET_IPV6)
 218         {
 219           for(i=0; i<8; i++)
 220             if((address.x[i] & subnet->net.ipv6.mask.x[i]) != subnet->net.ipv6.address.x[i])
 221               break;
 222           if(i=8)
 223             break;
 224         }
 225     }
 226 cp
 227   return subnet;
 228 }