www.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 1.1.2.3 2000/10/11 22:01:02 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(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(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type,
  91                    &subnet->net.mac.address.x[0],
  92                    &subnet->net.mac.address.x[1],
  93                    &subnet->net.mac.address.x[2],
  94                    &subnet->net.mac.address.x[3],
  95                    &subnet->net.mac.address.x[4],
  96                    &subnet->net.mac.address.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(subnetstr, "%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     }
 137 cp
 138   return subnet;
 139 }
 140
 141 char *net2str(subnet_t *subnet)
 142 {
 143   char *netstr;
 144 cp
 145   switch(subnet->type)
 146     {
 147       case SUBNET_MAC:
 148         asprintf(netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type,
 149                    subnet->net.mac.address.x[0],
 150                    subnet->net.mac.address.x[1],
 151                    subnet->net.mac.address.x[2],
 152                    subnet->net.mac.address.x[3],
 153                    subnet->net.mac.address.x[4],
 154                    subnet->net.mac.address.x[5]);
 155       case SUBNET_IPV4:
 156         asprintf(netstr, "%d,%lx:%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
 157       case SUBNET_IPV6:
 158         asprintf(netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
 159                    subnet->net.ipv6.address.x[0],
 160                    subnet->net.ipv6.address.x[1],
 161                    subnet->net.ipv6.address.x[2],
 162                    subnet->net.ipv6.address.x[3],
 163                    subnet->net.ipv6.address.x[4],
 164                    subnet->net.ipv6.address.x[5],
 165                    subnet->net.ipv6.address.x[6],
 166                    subnet->net.ipv6.address.x[7],
 167                    subnet->net.ipv6.mask.x[0],
 168                    subnet->net.ipv6.mask.x[1],
 169                    subnet->net.ipv6.mask.x[2],
 170                    subnet->net.ipv6.mask.x[3],
 171                    subnet->net.ipv6.mask.x[4],
 172                    subnet->net.ipv6.mask.x[5],
 173                    subnet->net.ipv6.mask.x[6],
 174                    subnet->net.ipv6.mask.x[7]);
 175       default:
 176         netstr = NULL;
 177     }
 178 cp
 179   return netstr;
 180 }
 181
 182 /* Subnet lookup routines */
 183
 184 subnet_t *lookup_subnet_mac(subnet_t *subnets, mac_t address)
 185 {
 186   subnet_t *subnet;
 187 cp
 188   for(subnet = subnets; subnet != NULL; subnet = subnet->next)
 189     {
 190       if(subnet->type == SUBNET_MAC)
 191         if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0)
 192           break;
 193     }
 194 cp
 195   return subnet;
 196 }
 197
 198 subnet_t *lookup_subnet_ipv4(subnet_t *subnets, ipv4_t address)
 199 {
 200   subnet_t *subnet;
 201 cp
 202   for(subnet = subnets; subnet != NULL; subnet = subnet->next)
 203     {
 204       if(subnet->type == SUBNET_IPV4)
 205         if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address)
 206           break;
 207     }
 208 cp
 209   return subnet;
 210 }
 211
 212 subnet_t *lookup_subnet_ipv6(subnet_t *subnets, ipv6_t address)
 213 {
 214   subnet_t *subnet;
 215   int i;
 216 cp
 217   for(subnet = subnets; subnet != NULL; subnet = subnet->next)
 218     {
 219       if(subnet->type == SUBNET_IPV6)
 220         {
 221           for(i=0; i<8; i++)
 222             if((address.x[i] & subnet->net.ipv6.mask.x[i]) != subnet->net.ipv6.address.x[i])
 223               break;
 224           if(i=8)
 225             break;
 226         }
 227     }
 228 cp
 229   return subnet;
 230 }