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 1.1.2.8 2000/10/29 00:02:20 guus Exp $
  21 */
  22
  23 #include <syslog.h>
  24 #include <stdio.h>
  25
  26 #include "config.h"
  27 #include <utils.h>
  28
  29 #include <xalloc.h>
  30 #include "subnet.h"
  31 #include "net.h"
  32 #include "conf.h"
  33 #include "system.h"
  34
  35 /* lists type of subnet */
  36
  37 subnet_t *subnet_list[SUBNET_TYPES] = { NULL };
  38
  39 /* Allocating and freeing space for subnets */
  40
  41 subnet_t *new_subnet(void)
  42 {
  43 cp
  44   return (subnet_t *)xmalloc(sizeof(subnet_t));
  45 }
  46
  47 void free_subnet(subnet_t *subnet)
  48 {
  49 cp
  50   free(subnet);
  51 }
  52
  53 /* Linked list management */
  54
  55 void subnet_add(conn_list_t *cl, subnet_t *subnet)
  56 {
  57   subnet_t *p = NULL;
  58   subnet_t *q = NULL;
  59 cp
  60   subnet->owner = cl;
  61
  62   /* Link it into the owners list of subnets (unsorted) */
  63
  64   subnet->next = cl->subnets;
  65   subnet->prev = NULL;
  66   if(subnet->next)
  67     subnet->next->prev = subnet;
  68   cl->subnets = subnet;
  69
  70   /* And now add it to the global subnet list (sorted) */
  71
  72   /* Sort on size of subnet mask (IPv4 only at the moment!)
  73
  74      Three cases: subnet_list[] = NULL -> just add this subnet
  75                   insert before first -> add it in front of list
  76                   rest: insert after another subnet
  77    */
  78 cp
  79   if(subnet_list[subnet->type])
  80     {
  81       p = q = subnet_list[subnet->type];
  82
  83       for(; p; p = p->global_next)
  84         {
  85           if(subnet->net.ipv4.mask >= p->net.ipv4.mask)
  86             break;
  87
  88           q = p;
  89         }
  90      }
  91 cp
  92   if(p == subnet_list[subnet->type])    /* First two cases */
  93     {
  94       /* Insert in front */
  95       subnet->global_next = subnet_list[subnet->type];
  96       subnet->global_prev = NULL;
  97       subnet_list[subnet->type] = subnet;
  98     }
  99   else                                  /* Third case */
 100     {
 101       /* Insert after q */
 102       subnet->global_next = q->global_next;
 103       subnet->global_prev = q;
 104       q->global_next = subnet;
 105     }
 106 cp
 107   if(subnet->global_next)
 108     subnet->global_next->global_prev = subnet;
 109 cp
 110 }
 111
 112 void subnet_del(subnet_t *subnet)
 113 {
 114 cp
 115   /* Remove it from owner's list */
 116
 117   if(subnet->prev)
 118     subnet->prev->next = subnet->next;
 119   else
 120     subnet->owner->subnets = subnet->next;
 121
 122   if(subnet->next)
 123     subnet->next->prev = subnet->prev;
 124
 125   /* Remove it from the global list */
 126
 127   if(subnet->global_prev)
 128     subnet->global_prev->global_next = subnet->global_next;
 129   else
 130     subnet_list[subnet->type] = subnet->global_next;
 131
 132   if(subnet->global_next)
 133     subnet->global_next->global_prev = subnet->global_prev;
 134
 135   free_subnet(subnet);
 136 cp
 137 }
 138
 139 /* Ascii representation of subnets */
 140
 141 subnet_t *str2net(char *subnetstr)
 142 {
 143   int type;
 144   subnet_t *subnet;
 145 cp
 146   if(sscanf(subnetstr, "%d,", &type) != 1)
 147     return NULL;
 148 cp
 149   subnet = new_subnet();
 150 cp
 151   switch(type)
 152     {
 153       case SUBNET_MAC:
 154         if(sscanf(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type,
 155                    &subnet->net.mac.address.x[0],
 156                    &subnet->net.mac.address.x[1],
 157                    &subnet->net.mac.address.x[2],
 158                    &subnet->net.mac.address.x[3],
 159                    &subnet->net.mac.address.x[4],
 160                    &subnet->net.mac.address.x[5]) != 7)
 161           {
 162             free_subnet(subnet);
 163             return NULL;
 164           }
 165         break;
 166       case SUBNET_IPV4:
 167         if(sscanf(subnetstr, "%d,%lx/%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3)
 168           {
 169             free_subnet(subnet);
 170             return NULL;
 171           }
 172         break;
 173       case SUBNET_IPV6:
 174         if(sscanf(subnetstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type,
 175                    &subnet->net.ipv6.address.x[0],
 176                    &subnet->net.ipv6.address.x[1],
 177                    &subnet->net.ipv6.address.x[2],
 178                    &subnet->net.ipv6.address.x[3],
 179                    &subnet->net.ipv6.address.x[4],
 180                    &subnet->net.ipv6.address.x[5],
 181                    &subnet->net.ipv6.address.x[6],
 182                    &subnet->net.ipv6.address.x[7],
 183                    &subnet->net.ipv6.mask.x[0],
 184                    &subnet->net.ipv6.mask.x[1],
 185                    &subnet->net.ipv6.mask.x[2],
 186                    &subnet->net.ipv6.mask.x[3],
 187                    &subnet->net.ipv6.mask.x[4],
 188                    &subnet->net.ipv6.mask.x[5],
 189                    &subnet->net.ipv6.mask.x[6],
 190                    &subnet->net.ipv6.mask.x[7]) != 17)
 191           {
 192             free_subnet(subnet);
 193             return NULL;
 194           }
 195         break;
 196       default:
 197         free_subnet(subnet);
 198         return NULL;
 199     }
 200 cp
 201   return subnet;
 202 }
 203
 204 char *net2str(subnet_t *subnet)
 205 {
 206   char *netstr;
 207 cp
 208   switch(subnet->type)
 209     {
 210       case SUBNET_MAC:
 211         asprintf(&netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type,
 212                    subnet->net.mac.address.x[0],
 213                    subnet->net.mac.address.x[1],
 214                    subnet->net.mac.address.x[2],
 215                    subnet->net.mac.address.x[3],
 216                    subnet->net.mac.address.x[4],
 217                    subnet->net.mac.address.x[5]);
 218         break;
 219       case SUBNET_IPV4:
 220         asprintf(&netstr, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
 221         break;
 222       case SUBNET_IPV6:
 223         asprintf(&netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx",
 224                    subnet->net.ipv6.address.x[0],
 225                    subnet->net.ipv6.address.x[1],
 226                    subnet->net.ipv6.address.x[2],
 227                    subnet->net.ipv6.address.x[3],
 228                    subnet->net.ipv6.address.x[4],
 229                    subnet->net.ipv6.address.x[5],
 230                    subnet->net.ipv6.address.x[6],
 231                    subnet->net.ipv6.address.x[7],
 232                    subnet->net.ipv6.mask.x[0],
 233                    subnet->net.ipv6.mask.x[1],
 234                    subnet->net.ipv6.mask.x[2],
 235                    subnet->net.ipv6.mask.x[3],
 236                    subnet->net.ipv6.mask.x[4],
 237                    subnet->net.ipv6.mask.x[5],
 238                    subnet->net.ipv6.mask.x[6],
 239                    subnet->net.ipv6.mask.x[7]);
 240         break;
 241       default:
 242         asprintf(&netstr, _("unknown"));
 243     }
 244 cp
 245   return netstr;
 246 }
 247
 248 /* Subnet lookup routines */
 249
 250 subnet_t *lookup_subnet_mac(mac_t address)
 251 {
 252   subnet_t *subnet;
 253 cp
 254   for(subnet = subnet_list[SUBNET_MAC]; subnet != NULL; subnet = subnet->global_next)
 255     {
 256       if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0)
 257         break;
 258     }
 259 cp
 260   return subnet;
 261 }
 262
 263 subnet_t *lookup_subnet_ipv4(ipv4_t address)
 264 {
 265   subnet_t *subnet;
 266 cp
 267   for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next)
 268     {
 269       if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address)
 270         break;
 271     }
 272 cp
 273   return subnet;
 274 }
 275
 276 subnet_t *lookup_subnet_ipv6(ipv6_t address)
 277 {
 278   subnet_t *subnet;
 279   int i;
 280 cp
 281   for(subnet = subnet_list[SUBNET_IPV6]; subnet != NULL; subnet = subnet->global_next)
 282     {
 283       for(i=0; i<8; i++)
 284         if((address.x[i] & subnet->net.ipv6.mask.x[i]) != subnet->net.ipv6.address.x[i])
 285           break;
 286       if(i == 8)
 287         break;
 288     }
 289 cp
 290   return subnet;
 291 }
 292
 293 void dump_subnet_list(void)
 294 {
 295   subnet_t *subnet;
 296   char *netstr;
 297 cp
 298   syslog(LOG_DEBUG, _("Subnet list:"));
 299
 300   for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next)
 301     {
 302       netstr = net2str(subnet);
 303       syslog(LOG_DEBUG, "  %s owner %s", netstr, subnet->owner->name);
 304       free(netstr);
 305     }
 306
 307   syslog(LOG_DEBUG, _("End of subnet list."));
 308 cp
 309 }