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 1.1.2.13 2000/11/20 19:41:13 guus Exp $
  21 */
  22
  23 #include "config.h"
  24
  25 #include <stdio.h>
  26 #include <syslog.h>
  27
  28 #include "conf.h"
  29 #include "net.h"
  30 #include "connection.h"
  31 #include "subnet.h"
  32 #include "system.h"
  33
  34 #include <utils.h>
  35 #include <xalloc.h>
  36 #include <rbl.h>
  37
  38 /* lists type of subnet */
  39
  40 rbltree_t *subnet_tree;
  41
  42 void init_subnets(void)
  43 {
  44 cp
  45   subnet_tree = new_rbltree((rbl_compare_t)subnet_compare, (rbl_action_t)free_subnet);
  46 cp
  47 }
  48
  49 /* Subnet comparison */
  50
  51 int subnet_compare_mac(subnet_t *a, subnet_t *b)
  52 {
  53 cp
  54   return memcmp(&a->net.mac.address, &b->net.mac.address, sizeof(mac_t));
  55 }
  56
  57 int subnet_compare_ipv4(subnet_t *a, subnet_t *b)
  58 {
  59 cp
  60   /* If the subnet of a falls within the range of subnet b,
  61      then we consider a smaller then b.
  62      Otherwise, the addresses alone (and not the subnet masks) will be compared.
  63    */
  64
  65   if(a->net.ipv4.mask > b->net.ipv4.mask)
  66     if((a->net.ipv4.address & b->net.ipv4.mask) == b->net.ipv4.address)
  67       return -1;
  68
  69   return a->net.ipv4.address - b->net.ipv4.address;
  70 }
  71
  72 int subnet_compare_ipv6(subnet_t *a, subnet_t *b)
  73 {
  74 cp
  75   /* Same as ipv4 case, but with nasty 128 bit addresses */
  76
  77   if(memcmp(&a->net.ipv6.mask, &b->net.ipv6.mask, sizeof(ipv6_t)) > 0)
  78     if((a->net.ipv6.address.x[0] & b->net.ipv6.mask.x[0]) == b->net.ipv6.address.x[0] &&
  79        (a->net.ipv6.address.x[1] & b->net.ipv6.mask.x[1]) == b->net.ipv6.address.x[1] &&
  80        (a->net.ipv6.address.x[2] & b->net.ipv6.mask.x[2]) == b->net.ipv6.address.x[2] &&
  81        (a->net.ipv6.address.x[3] & b->net.ipv6.mask.x[3]) == b->net.ipv6.address.x[3] &&
  82        (a->net.ipv6.address.x[4] & b->net.ipv6.mask.x[4]) == b->net.ipv6.address.x[4] &&
  83        (a->net.ipv6.address.x[5] & b->net.ipv6.mask.x[5]) == b->net.ipv6.address.x[5] &&
  84        (a->net.ipv6.address.x[6] & b->net.ipv6.mask.x[6]) == b->net.ipv6.address.x[6] &&
  85        (a->net.ipv6.address.x[7] & b->net.ipv6.mask.x[7]) == b->net.ipv6.address.x[7])
  86       return -1;
  87
  88   return memcmp(&a->net.ipv6.address, &b->net.ipv6.address, sizeof(ipv6_t));
  89 }
  90
  91 int subnet_compare(subnet_t *a, subnet_t *b)
  92 {
  93   int x;
  94 cp
  95   x = a->type - b->type;
  96   if(x)
  97     return x;
  98
  99   switch(a->type)
 100     {
 101       case SUBNET_MAC:
 102         return subnet_compare_mac(a, b);
 103       case SUBNET_IPV4:
 104         return subnet_compare_ipv4(a, b);
 105       case SUBNET_IPV6:
 106         return subnet_compare_ipv6(a, b);
 107       default:
 108         syslog(LOG_ERR, _("subnet_compare() was called with unknown subnet type %d, restarting!"), a->type);
 109         sighup = 1;
 110         return 0;
 111     }
 112 }
 113
 114 /* Allocating and freeing space for subnets */
 115
 116 subnet_t *new_subnet(void)
 117 {
 118 cp
 119   return (subnet_t *)xmalloc(sizeof(subnet_t));
 120 }
 121
 122 void free_subnet(subnet_t *subnet)
 123 {
 124 cp
 125   free(subnet);
 126 }
 127
 128 /* Linked list management */
 129
 130 void subnet_add(connection_t *cl, subnet_t *subnet)
 131 {
 132 cp
 133   rbl_insert(subnet_tree, subnet);
 134   rbl_insert(cl->subnet_tree, subnet);
 135 cp
 136 }
 137
 138 void subnet_del(subnet_t *subnet)
 139 {
 140 cp
 141   rbl_delete(subnet->owner->subnet_tree, subnet);
 142   rbl_delete(subnet_tree, subnet);
 143 cp
 144 }
 145
 146 /* Ascii representation of subnets */
 147
 148 subnet_t *str2net(char *subnetstr)
 149 {
 150   int type;
 151   subnet_t *subnet;
 152 cp
 153   if(sscanf(subnetstr, "%d,", &type) != 1)
 154     return NULL;
 155 cp
 156   subnet = new_subnet();
 157 cp
 158   switch(type)
 159     {
 160       case SUBNET_MAC:
 161         if(sscanf(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type,
 162                    &subnet->net.mac.address.x[0],
 163                    &subnet->net.mac.address.x[1],
 164                    &subnet->net.mac.address.x[2],
 165                    &subnet->net.mac.address.x[3],
 166                    &subnet->net.mac.address.x[4],
 167                    &subnet->net.mac.address.x[5]) != 7)
 168           {
 169             free_subnet(subnet);
 170             return NULL;
 171           }
 172         break;
 173       case SUBNET_IPV4:
 174         if(sscanf(subnetstr, "%d,%lx/%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3)
 175           {
 176             free_subnet(subnet);
 177             return NULL;
 178           }
 179         break;
 180       case SUBNET_IPV6:
 181         if(sscanf(subnetstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type,
 182                    &subnet->net.ipv6.address.x[0],
 183                    &subnet->net.ipv6.address.x[1],
 184                    &subnet->net.ipv6.address.x[2],
 185                    &subnet->net.ipv6.address.x[3],
 186                    &subnet->net.ipv6.address.x[4],
 187                    &subnet->net.ipv6.address.x[5],
 188                    &subnet->net.ipv6.address.x[6],
 189                    &subnet->net.ipv6.address.x[7],
 190                    &subnet->net.ipv6.mask.x[0],
 191                    &subnet->net.ipv6.mask.x[1],
 192                    &subnet->net.ipv6.mask.x[2],
 193                    &subnet->net.ipv6.mask.x[3],
 194                    &subnet->net.ipv6.mask.x[4],
 195                    &subnet->net.ipv6.mask.x[5],
 196                    &subnet->net.ipv6.mask.x[6],
 197                    &subnet->net.ipv6.mask.x[7]) != 17)
 198           {
 199             free_subnet(subnet);
 200             return NULL;
 201           }
 202         break;
 203       default:
 204         free_subnet(subnet);
 205         return NULL;
 206     }
 207 cp
 208   return subnet;
 209 }
 210
 211 char *net2str(subnet_t *subnet)
 212 {
 213   char *netstr;
 214 cp
 215   switch(subnet->type)
 216     {
 217       case SUBNET_MAC:
 218         asprintf(&netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type,
 219                    subnet->net.mac.address.x[0],
 220                    subnet->net.mac.address.x[1],
 221                    subnet->net.mac.address.x[2],
 222                    subnet->net.mac.address.x[3],
 223                    subnet->net.mac.address.x[4],
 224                    subnet->net.mac.address.x[5]);
 225         break;
 226       case SUBNET_IPV4:
 227         asprintf(&netstr, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
 228         break;
 229       case SUBNET_IPV6:
 230         asprintf(&netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", subnet->type,
 231                    subnet->net.ipv6.address.x[0],
 232                    subnet->net.ipv6.address.x[1],
 233                    subnet->net.ipv6.address.x[2],
 234                    subnet->net.ipv6.address.x[3],
 235                    subnet->net.ipv6.address.x[4],
 236                    subnet->net.ipv6.address.x[5],
 237                    subnet->net.ipv6.address.x[6],
 238                    subnet->net.ipv6.address.x[7],
 239                    subnet->net.ipv6.mask.x[0],
 240                    subnet->net.ipv6.mask.x[1],
 241                    subnet->net.ipv6.mask.x[2],
 242                    subnet->net.ipv6.mask.x[3],
 243                    subnet->net.ipv6.mask.x[4],
 244                    subnet->net.ipv6.mask.x[5],
 245                    subnet->net.ipv6.mask.x[6],
 246                    subnet->net.ipv6.mask.x[7]);
 247         break;
 248       default:
 249         asprintf(&netstr, _("unknown"));
 250     }
 251 cp
 252   return netstr;
 253 }
 254
 255 /* Subnet lookup routines */
 256
 257 subnet_t *lookup_subnet_mac(mac_t address)
 258 {
 259   subnet_t subnet;
 260 cp
 261   subnet.type = SUBNET_MAC;
 262   subnet.net.mac.address = address;
 263   return (subnet_t *)rbl_search_closest(subnet_tree, &subnet);
 264 }
 265
 266 subnet_t *lookup_subnet_ipv4(ipv4_t address)
 267 {
 268   subnet_t subnet;
 269 cp
 270   subnet.type = SUBNET_IPV4;
 271   subnet.net.ipv4.address = address;
 272   subnet.net.ipv4.mask = 0xFFFFFFFF;
 273   return (subnet_t *)rbl_search_closest(subnet_tree, &subnet);
 274 }
 275
 276 subnet_t *lookup_subnet_ipv6(ipv6_t address)
 277 {
 278   subnet_t subnet;
 279 cp
 280   subnet.type = SUBNET_IPV6;
 281   subnet.net.ipv6.address = address;
 282   memset(&subnet.net.ipv6.mask, 0xFF, 16);
 283   return (subnet_t *)rbl_search_closest(subnet_tree, &subnet);
 284 }
 285
 286 void dump_subnet_list(void)
 287 {
 288   char *netstr;
 289   subnet_t *subnet;
 290   rbl_t *rbl;
 291 cp
 292   syslog(LOG_DEBUG, _("Subnet list:"));
 293   RBL_FOREACH(subnet_tree, rbl)
 294     {
 295       subnet = (subnet_t *)rbl->data;
 296       netstr = net2str(subnet);
 297       syslog(LOG_DEBUG, " %s owner %s", netstr, subnet->owner->name);
 298       free(netstr);
 299     }
 300   syslog(LOG_DEBUG, _("End of subnet list."));
 301 cp
 302 }