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 1.1.2.7 2000/10/28 21:05:20 guus Exp $
  21 */
  22
  23 #include <syslog.h>
  24
  25 #include "config.h"
  26 #include <utils.h>
  27
  28 #include <xalloc.h>
  29 #include "subnet.h"
  30 #include "net.h"
  31 #include "conf.h"
  32 #include "system.h"
  33
  34 /* lists type of subnet */
  35
  36 subnet_t *subnet_list[SUBNET_TYPES] = { NULL };
  37
  38 /* Allocating and freeing space for subnets */
  39
  40 subnet_t *new_subnet(void)
  41 {
  42 cp
  43   return (subnet_t *)xmalloc(sizeof(subnet_t));
  44 }
  45
  46 void free_subnet(subnet_t *subnet)
  47 {
  48 cp
  49   free(subnet);
  50 }
  51
  52 /* Linked list management */
  53
  54 void subnet_add(conn_list_t *cl, subnet_t *subnet)
  55 {
  56   subnet_t *p = NULL;
  57   subnet_t *q = NULL;
  58 cp
  59   subnet->owner = cl;
  60
  61   /* Link it into the owners list of subnets (unsorted) */
  62
  63   subnet->next = cl->subnets;
  64   subnet->prev = NULL;
  65   if(subnet->next)
  66     subnet->next->prev = subnet;
  67   cl->subnets = subnet;
  68
  69   /* And now add it to the global subnet list (sorted) */
  70
  71   /* Sort on size of subnet mask (IPv4 only at the moment!)
  72
  73      Three cases: subnet_list[] = NULL -> just add this subnet
  74                   insert before first -> add it in front of list
  75                   rest: insert after another subnet
  76    */
  77 cp
  78   if(subnet_list[subnet->type])
  79     {
  80       p = q = subnet_list[subnet->type];
  81
  82       for(; p; p = p->global_next)
  83         {
  84           if(subnet->net.ipv4.mask >= p->net.ipv4.mask)
  85             break;
  86
  87           q = p;
  88         }
  89      }
  90 cp
  91   if(p == subnet_list[subnet->type])    /* First two cases */
  92     {
  93       /* Insert in front */
  94       subnet->global_next = subnet_list[subnet->type];
  95       subnet->global_prev = NULL;
  96       subnet_list[subnet->type] = subnet;
  97     }
  98   else                                  /* Third case */
  99     {
 100       /* Insert after q */
 101       subnet->global_next = q->global_next;
 102       subnet->global_prev = q;
 103       q->global_next = subnet;
 104     }
 105 cp
 106   if(subnet->global_next)
 107     subnet->global_next->global_prev = subnet;
 108 cp
 109 }
 110
 111 void subnet_del(subnet_t *subnet)
 112 {
 113 cp
 114   /* Remove it from owner's list */
 115
 116   if(subnet->prev)
 117     {
 118       subnet->prev->next = subnet->next;
 119     }
 120   else
 121     {
 122       subnet->owner->subnets = subnet->next;
 123     }
 124
 125   subnet->next->prev = subnet->prev;
 126
 127   /* Remove it from the global list */
 128
 129   if(subnet->global_prev)
 130     {
 131       subnet->global_prev->global_next = subnet->global_next;
 132     }
 133   else
 134     {
 135       subnet_list[subnet->type] = subnet->global_next;
 136     }
 137
 138   subnet->global_next->global_prev = subnet->global_prev;
 139
 140   free_subnet(subnet);
 141 cp
 142 }
 143
 144 /* Ascii representation of subnets */
 145
 146 subnet_t *str2net(char *subnetstr)
 147 {
 148   int type;
 149   subnet_t *subnet;
 150 cp
 151   if(sscanf(subnetstr, "%d,", &type) != 1)
 152     return NULL;
 153 cp
 154   subnet = new_subnet();
 155 cp
 156   switch(type)
 157     {
 158       case SUBNET_MAC:
 159         if(sscanf(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type,
 160                    &subnet->net.mac.address.x[0],
 161                    &subnet->net.mac.address.x[1],
 162                    &subnet->net.mac.address.x[2],
 163                    &subnet->net.mac.address.x[3],
 164                    &subnet->net.mac.address.x[4],
 165                    &subnet->net.mac.address.x[5]) != 7)
 166           {
 167             free_subnet(subnet);
 168             return NULL;
 169           }
 170         break;
 171       case SUBNET_IPV4:
 172         if(sscanf(subnetstr, "%d,%lx/%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3)
 173           {
 174             free_subnet(subnet);
 175             return NULL;
 176           }
 177         break;
 178       case SUBNET_IPV6:
 179         if(sscanf(subnetstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type,
 180                    &subnet->net.ipv6.address.x[0],
 181                    &subnet->net.ipv6.address.x[1],
 182                    &subnet->net.ipv6.address.x[2],
 183                    &subnet->net.ipv6.address.x[3],
 184                    &subnet->net.ipv6.address.x[4],
 185                    &subnet->net.ipv6.address.x[5],
 186                    &subnet->net.ipv6.address.x[6],
 187                    &subnet->net.ipv6.address.x[7],
 188                    &subnet->net.ipv6.mask.x[0],
 189                    &subnet->net.ipv6.mask.x[1],
 190                    &subnet->net.ipv6.mask.x[2],
 191                    &subnet->net.ipv6.mask.x[3],
 192                    &subnet->net.ipv6.mask.x[4],
 193                    &subnet->net.ipv6.mask.x[5],
 194                    &subnet->net.ipv6.mask.x[6],
 195                    &subnet->net.ipv6.mask.x[7]) != 17)
 196           {
 197             free_subnet(subnet);
 198             return NULL;
 199           }
 200         break;
 201       default:
 202         free_subnet(subnet);
 203         return NULL;
 204     }
 205 cp
 206   return subnet;
 207 }
 208
 209 char *net2str(subnet_t *subnet)
 210 {
 211   char *netstr;
 212 cp
 213   switch(subnet->type)
 214     {
 215       case SUBNET_MAC:
 216         asprintf(&netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type,
 217                    subnet->net.mac.address.x[0],
 218                    subnet->net.mac.address.x[1],
 219                    subnet->net.mac.address.x[2],
 220                    subnet->net.mac.address.x[3],
 221                    subnet->net.mac.address.x[4],
 222                    subnet->net.mac.address.x[5]);
 223         break;
 224       case SUBNET_IPV4:
 225         asprintf(&netstr, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
 226         break;
 227       case SUBNET_IPV6:
 228         asprintf(&netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
 229                    subnet->net.ipv6.address.x[0],
 230                    subnet->net.ipv6.address.x[1],
 231                    subnet->net.ipv6.address.x[2],
 232                    subnet->net.ipv6.address.x[3],
 233                    subnet->net.ipv6.address.x[4],
 234                    subnet->net.ipv6.address.x[5],
 235                    subnet->net.ipv6.address.x[6],
 236                    subnet->net.ipv6.address.x[7],
 237                    subnet->net.ipv6.mask.x[0],
 238                    subnet->net.ipv6.mask.x[1],
 239                    subnet->net.ipv6.mask.x[2],
 240                    subnet->net.ipv6.mask.x[3],
 241                    subnet->net.ipv6.mask.x[4],
 242                    subnet->net.ipv6.mask.x[5],
 243                    subnet->net.ipv6.mask.x[6],
 244                    subnet->net.ipv6.mask.x[7]);
 245         break;
 246       default:
 247         asprintf(&netstr, _("unknown"));
 248     }
 249 cp
 250   return netstr;
 251 }
 252
 253 /* Subnet lookup routines */
 254
 255 subnet_t *lookup_subnet_mac(mac_t address)
 256 {
 257   subnet_t *subnet;
 258 cp
 259   for(subnet = subnet_list[SUBNET_MAC]; subnet != NULL; subnet = subnet->global_next)
 260     {
 261       if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0)
 262         break;
 263     }
 264 cp
 265   return subnet;
 266 }
 267
 268 subnet_t *lookup_subnet_ipv4(ipv4_t address)
 269 {
 270   subnet_t *subnet;
 271 cp
 272   for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next)
 273     {
 274       if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address)
 275         break;
 276     }
 277 cp
 278   return subnet;
 279 }
 280
 281 subnet_t *lookup_subnet_ipv6(ipv6_t address)
 282 {
 283   subnet_t *subnet;
 284   int i;
 285 cp
 286   for(subnet = subnet_list[SUBNET_IPV6]; subnet != NULL; subnet = subnet->global_next)
 287     {
 288       for(i=0; i<8; i++)
 289         if((address.x[i] & subnet->net.ipv6.mask.x[i]) != subnet->net.ipv6.address.x[i])
 290           break;
 291       if(i=8)
 292         break;
 293     }
 294 cp
 295   return subnet;
 296 }
 297
 298 void dump_subnet_list(void)
 299 {
 300   subnet_t *subnet;
 301   char *netstr;
 302 cp
 303   syslog(LOG_DEBUG, _("Subnet list:"));
 304
 305   for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next)
 306     {
 307       netstr = net2str(subnet);
 308       syslog(LOG_DEBUG, "%s owner %s", netstr, subnet->owner->name);
 309       free(netstr);
 310     }
 311
 312   syslog(LOG_DEBUG, _("End of subnet list."));
 313 cp
 314 }