git.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 1.1.2.10 2000/11/04 11:49:58 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 "subnet.h"
  31 #include "system.h"
  32
  33 #include <utils.h>
  34 #include <xalloc.h>
  35
  36 /* lists type of subnet */
  37
  38 subnet_t *subnet_list[SUBNET_TYPES] = { NULL };
  39
  40 /* Allocating and freeing space for subnets */
  41
  42 subnet_t *new_subnet(void)
  43 {
  44 cp
  45   return (subnet_t *)xmalloc(sizeof(subnet_t));
  46 }
  47
  48 void free_subnet(subnet_t *subnet)
  49 {
  50 cp
  51   free(subnet);
  52 }
  53
  54 /* Linked list management */
  55
  56 void subnet_add(conn_list_t *cl, subnet_t *subnet)
  57 {
  58   subnet_t *p = NULL;
  59   subnet_t *q = NULL;
  60 cp
  61   subnet->owner = cl;
  62
  63   /* Link it into the owners list of subnets (unsorted) */
  64
  65   subnet->next = cl->subnets;
  66   subnet->prev = NULL;
  67   if(subnet->next)
  68     subnet->next->prev = subnet;
  69   cl->subnets = subnet;
  70
  71   /* And now add it to the global subnet list (sorted) */
  72
  73   /* Sort on size of subnet mask (IPv4 only at the moment!)
  74
  75      Three cases: subnet_list[] = NULL -> just add this subnet
  76                   insert before first -> add it in front of list
  77                   rest: insert after another subnet
  78    */
  79 cp
  80   if(subnet_list[subnet->type])
  81     {
  82       p = q = subnet_list[subnet->type];
  83
  84       for(; p; p = p->global_next)
  85         {
  86           if(subnet->net.ipv4.mask >= p->net.ipv4.mask)
  87             break;
  88
  89           q = p;
  90         }
  91      }
  92 cp
  93   if(p == subnet_list[subnet->type])    /* First two cases */
  94     {
  95       /* Insert in front */
  96       subnet->global_next = subnet_list[subnet->type];
  97       subnet->global_prev = NULL;
  98       subnet_list[subnet->type] = subnet;
  99     }
 100   else                                  /* Third case */
 101     {
 102       /* Insert after q */
 103       subnet->global_next = q->global_next;
 104       subnet->global_prev = q;
 105       q->global_next = subnet;
 106     }
 107 cp
 108   if(subnet->global_next)
 109     subnet->global_next->global_prev = subnet;
 110 cp
 111 }
 112
 113 void subnet_del(subnet_t *subnet)
 114 {
 115 cp
 116   /* Remove it from owner's list */
 117
 118   if(subnet->prev)
 119     subnet->prev->next = subnet->next;
 120   else
 121     subnet->owner->subnets = subnet->next;
 122
 123   if(subnet->next)
 124     subnet->next->prev = subnet->prev;
 125
 126   /* Remove it from the global list */
 127
 128   if(subnet->global_prev)
 129     subnet->global_prev->global_next = subnet->global_next;
 130   else
 131     subnet_list[subnet->type] = subnet->global_next;
 132
 133   if(subnet->global_next)
 134     subnet->global_next->global_prev = subnet->global_prev;
 135
 136   free_subnet(subnet);
 137 cp
 138 }
 139
 140 /* Ascii representation of subnets */
 141
 142 subnet_t *str2net(char *subnetstr)
 143 {
 144   int type;
 145   subnet_t *subnet;
 146 cp
 147   if(sscanf(subnetstr, "%d,", &type) != 1)
 148     return NULL;
 149 cp
 150   subnet = new_subnet();
 151 cp
 152   switch(type)
 153     {
 154       case SUBNET_MAC:
 155         if(sscanf(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type,
 156                    &subnet->net.mac.address.x[0],
 157                    &subnet->net.mac.address.x[1],
 158                    &subnet->net.mac.address.x[2],
 159                    &subnet->net.mac.address.x[3],
 160                    &subnet->net.mac.address.x[4],
 161                    &subnet->net.mac.address.x[5]) != 7)
 162           {
 163             free_subnet(subnet);
 164             return NULL;
 165           }
 166         break;
 167       case SUBNET_IPV4:
 168         if(sscanf(subnetstr, "%d,%lx/%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3)
 169           {
 170             free_subnet(subnet);
 171             return NULL;
 172           }
 173         break;
 174       case SUBNET_IPV6:
 175         if(sscanf(subnetstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type,
 176                    &subnet->net.ipv6.address.x[0],
 177                    &subnet->net.ipv6.address.x[1],
 178                    &subnet->net.ipv6.address.x[2],
 179                    &subnet->net.ipv6.address.x[3],
 180                    &subnet->net.ipv6.address.x[4],
 181                    &subnet->net.ipv6.address.x[5],
 182                    &subnet->net.ipv6.address.x[6],
 183                    &subnet->net.ipv6.address.x[7],
 184                    &subnet->net.ipv6.mask.x[0],
 185                    &subnet->net.ipv6.mask.x[1],
 186                    &subnet->net.ipv6.mask.x[2],
 187                    &subnet->net.ipv6.mask.x[3],
 188                    &subnet->net.ipv6.mask.x[4],
 189                    &subnet->net.ipv6.mask.x[5],
 190                    &subnet->net.ipv6.mask.x[6],
 191                    &subnet->net.ipv6.mask.x[7]) != 17)
 192           {
 193             free_subnet(subnet);
 194             return NULL;
 195           }
 196         break;
 197       default:
 198         free_subnet(subnet);
 199         return NULL;
 200     }
 201 cp
 202   return subnet;
 203 }
 204
 205 char *net2str(subnet_t *subnet)
 206 {
 207   char *netstr;
 208 cp
 209   switch(subnet->type)
 210     {
 211       case SUBNET_MAC:
 212         asprintf(&netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type,
 213                    subnet->net.mac.address.x[0],
 214                    subnet->net.mac.address.x[1],
 215                    subnet->net.mac.address.x[2],
 216                    subnet->net.mac.address.x[3],
 217                    subnet->net.mac.address.x[4],
 218                    subnet->net.mac.address.x[5]);
 219         break;
 220       case SUBNET_IPV4:
 221         asprintf(&netstr, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
 222         break;
 223       case SUBNET_IPV6:
 224         asprintf(&netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", subnet->type,
 225                    subnet->net.ipv6.address.x[0],
 226                    subnet->net.ipv6.address.x[1],
 227                    subnet->net.ipv6.address.x[2],
 228                    subnet->net.ipv6.address.x[3],
 229                    subnet->net.ipv6.address.x[4],
 230                    subnet->net.ipv6.address.x[5],
 231                    subnet->net.ipv6.address.x[6],
 232                    subnet->net.ipv6.address.x[7],
 233                    subnet->net.ipv6.mask.x[0],
 234                    subnet->net.ipv6.mask.x[1],
 235                    subnet->net.ipv6.mask.x[2],
 236                    subnet->net.ipv6.mask.x[3],
 237                    subnet->net.ipv6.mask.x[4],
 238                    subnet->net.ipv6.mask.x[5],
 239                    subnet->net.ipv6.mask.x[6],
 240                    subnet->net.ipv6.mask.x[7]);
 241         break;
 242       default:
 243         asprintf(&netstr, _("unknown"));
 244     }
 245 cp
 246   return netstr;
 247 }
 248
 249 /* Subnet lookup routines */
 250
 251 subnet_t *lookup_subnet_mac(mac_t address)
 252 {
 253   subnet_t *subnet;
 254 cp
 255   for(subnet = subnet_list[SUBNET_MAC]; subnet != NULL; subnet = subnet->global_next)
 256     {
 257       if(memcmp(&address, &subnet->net.mac.address, sizeof(address)) == 0)
 258         break;
 259     }
 260 cp
 261   return subnet;
 262 }
 263
 264 subnet_t *lookup_subnet_ipv4(ipv4_t address)
 265 {
 266   subnet_t *subnet;
 267 cp
 268   for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next)
 269     {
 270       if((address & subnet->net.ipv4.mask) == subnet->net.ipv4.address)
 271         break;
 272     }
 273 cp
 274   return subnet;
 275 }
 276
 277 subnet_t *lookup_subnet_ipv6(ipv6_t address)
 278 {
 279   subnet_t *subnet;
 280   int i;
 281 cp
 282   for(subnet = subnet_list[SUBNET_IPV6]; subnet != NULL; subnet = subnet->global_next)
 283     {
 284       for(i=0; i<8; i++)
 285         if((address.x[i] & subnet->net.ipv6.mask.x[i]) != subnet->net.ipv6.address.x[i])
 286           break;
 287       if(i == 8)
 288         break;
 289     }
 290 cp
 291   return subnet;
 292 }
 293
 294 void dump_subnet_list(void)
 295 {
 296   subnet_t *subnet;
 297   char *netstr;
 298 cp
 299   syslog(LOG_DEBUG, _("Subnet list:"));
 300
 301   for(subnet = subnet_list[SUBNET_IPV4]; subnet != NULL; subnet = subnet->global_next)
 302     {
 303       netstr = net2str(subnet);
 304       syslog(LOG_DEBUG, "  %s owner %s", netstr, subnet->owner->name);
 305       free(netstr);
 306     }
 307
 308   syslog(LOG_DEBUG, _("End of subnet list."));
 309 cp
 310 }