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 1.1.2.5 2000/10/24 15:46:18 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   subnet_t *p = NULL;
  49   subnet_t *q = NULL;
  50 cp
  51   subnet->owner = cl;
  52
  53   /* Sort on size of subnet mask (IPv4 only at the moment!)
  54
  55      Three cases: cl->subnets = NULL -> just add this subnet
  56                   insert before first -> add it in front of list
  57                   rest: insert after another subnet
  58    */
  59
  60   if(cl->subnets)
  61     {
  62       p = q = cl->subnets;
  63
  64       for(; p; p = p->next)
  65         {
  66           if(subnet->net.ipv4.mask >= p->net.ipv4.mask)
  67             break;
  68
  69           q = p;
  70         }
  71      }
  72
  73   if(!cl->subnets || p == cl->subnets)  /* First two cases */
  74     {
  75       /* Insert in front */
  76       subnet->next = cl->subnets;
  77       subnet->prev = NULL;
  78       cl->subnets = subnet;
  79     }
  80   else                                  /* Third case */
  81     {
  82       /* Insert after q */
  83       subnet->next = q->next;
  84       subnet->prev = q;
  85       q->next = subnet;
  86     }
  87
  88   if(subnet->next)
  89     subnet->next->prev = subnet;
  90 cp
  91 }
  92
  93 void subnet_del(subnet_t *subnet)
  94 {
  95 cp
  96   if(subnet->prev)
  97     subnet->prev->next = subnet->next;
  98   else
  99     subnet->owner->subnets = subnet->next;
 100
 101   if(subnet->next)
 102     subnet->next->prev = subnet->prev;
 103
 104   free_subnet(subnet);
 105 cp
 106 }
 107
 108 /* Ascii representation of subnets */
 109
 110 subnet_t *str2net(char *subnetstr)
 111 {
 112   int type;
 113   subnet_t *subnet;
 114 cp
 115   if(sscanf(subnetstr, "%d,", &type) != 1)
 116     return NULL;
 117
 118   subnet = new_subnet();
 119
 120   switch(type)
 121     {
 122       case SUBNET_MAC:
 123         if(sscanf(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type,
 124                    &subnet->net.mac.address.x[0],
 125                    &subnet->net.mac.address.x[1],
 126                    &subnet->net.mac.address.x[2],
 127                    &subnet->net.mac.address.x[3],
 128                    &subnet->net.mac.address.x[4],
 129                    &subnet->net.mac.address.x[5]) != 7)
 130           {
 131             free_subnet(subnet);
 132             return NULL;
 133           }
 134         break;
 135       case SUBNET_IPV4:
 136         if(sscanf(subnetstr, "%d,%lx/%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3)
 137           {
 138             free_subnet(subnet);
 139             return NULL;
 140           }
 141         break;
 142       case SUBNET_IPV6:
 143         if(sscanf(subnetstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type,
 144                    &subnet->net.ipv6.address.x[0],
 145                    &subnet->net.ipv6.address.x[1],
 146                    &subnet->net.ipv6.address.x[2],
 147                    &subnet->net.ipv6.address.x[3],
 148                    &subnet->net.ipv6.address.x[4],
 149                    &subnet->net.ipv6.address.x[5],
 150                    &subnet->net.ipv6.address.x[6],
 151                    &subnet->net.ipv6.address.x[7],
 152                    &subnet->net.ipv6.mask.x[0],
 153                    &subnet->net.ipv6.mask.x[1],
 154                    &subnet->net.ipv6.mask.x[2],
 155                    &subnet->net.ipv6.mask.x[3],
 156                    &subnet->net.ipv6.mask.x[4],
 157                    &subnet->net.ipv6.mask.x[5],
 158                    &subnet->net.ipv6.mask.x[6],
 159                    &subnet->net.ipv6.mask.x[7]) != 17)
 160           {
 161             free_subnet(subnet);
 162             return NULL;
 163           }
 164         break;
 165                 break;
 166       default:
 167         free_subnet(subnet);
 168         return NULL;
 169     }
 170 cp
 171   return subnet;
 172 }
 173
 174 char *net2str(subnet_t *subnet)
 175 {
 176   char *netstr;
 177 cp
 178   switch(subnet->type)
 179     {
 180       case SUBNET_MAC:
 181         asprintf(&netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type,
 182                    subnet->net.mac.address.x[0],
 183                    subnet->net.mac.address.x[1],
 184                    subnet->net.mac.address.x[2],
 185                    subnet->net.mac.address.x[3],
 186                    subnet->net.mac.address.x[4],
 187                    subnet->net.mac.address.x[5]);
 188         break;
 189       case SUBNET_IPV4:
 190         asprintf(&netstr, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
 191         break;
 192       case SUBNET_IPV6:
 193         asprintf(&netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
 194                    subnet->net.ipv6.address.x[0],
 195                    subnet->net.ipv6.address.x[1],
 196                    subnet->net.ipv6.address.x[2],
 197                    subnet->net.ipv6.address.x[3],
 198                    subnet->net.ipv6.address.x[4],
 199                    subnet->net.ipv6.address.x[5],
 200                    subnet->net.ipv6.address.x[6],
 201                    subnet->net.ipv6.address.x[7],
 202                    subnet->net.ipv6.mask.x[0],
 203                    subnet->net.ipv6.mask.x[1],
 204                    subnet->net.ipv6.mask.x[2],
 205                    subnet->net.ipv6.mask.x[3],
 206                    subnet->net.ipv6.mask.x[4],
 207                    subnet->net.ipv6.mask.x[5],
 208                    subnet->net.ipv6.mask.x[6],
 209                    subnet->net.ipv6.mask.x[7]);
 210         break;
 211       default:
 212         netstr = NULL;
 213     }
 214 cp
 215   return netstr;
 216 }
 217
 218 /* Subnet lookup routines */
 219
 220 subnet_t *lookup_subnet_mac(subnet_t *subnets, mac_t address)
 221 {
 222   subnet_t *subnet;
 223 cp
 224   for(subnet = subnets; subnet != NULL; subnet = subnet->next)
 225     {
 226       if(subnet->type == SUBNET_MAC)
 227         if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0)
 228           break;
 229     }
 230 cp
 231   return subnet;
 232 }
 233
 234 subnet_t *lookup_subnet_ipv4(subnet_t *subnets, ipv4_t address)
 235 {
 236   subnet_t *subnet;
 237 cp
 238   for(subnet = subnets; subnet != NULL; subnet = subnet->next)
 239     {
 240       if(subnet->type == SUBNET_IPV4)
 241         if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address)
 242           break;
 243     }
 244 cp
 245   return subnet;
 246 }
 247
 248 subnet_t *lookup_subnet_ipv6(subnet_t *subnets, ipv6_t address)
 249 {
 250   subnet_t *subnet;
 251   int i;
 252 cp
 253   for(subnet = subnets; subnet != NULL; subnet = subnet->next)
 254     {
 255       if(subnet->type == SUBNET_IPV6)
 256         {
 257           for(i=0; i<8; i++)
 258             if((address.x[i] & subnet->net.ipv6.mask.x[i]) != subnet->net.ipv6.address.x[i])
 259               break;
 260           if(i=8)
 261             break;
 262         }
 263     }
 264 cp
 265   return subnet;
 266 }