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tinc/src/subnet.c
Guus Sliepen cf49b2c064 Another big & bad commit: 
- Added some extra search functions to rbl routines
- Fix subnet_lookup()
- Reorder some syslog messages to make more sense
- daemon() is back
- Don't let scripts execute in parallel (gives race conditions, and
  anyway something MIGHT just be configured which is necessary for further
  execution of tinc itself)
- Accidently merged check_child() with execute_script().
- Small fixes
2000-11-24 23:13:07 +00:00

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/*
subnet.c -- handle subnet lookups and lists
Copyright (C) 2000 Guus Sliepen <guus@sliepen.warande.net>,
2000 Ivo Timmermans <itimmermans@bigfoot.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id: subnet.c,v 1.1.2.15 2000/11/24 23:13:06 guus Exp $
*/
#include "config.h"
#include <stdio.h>
#include <syslog.h>
#include "conf.h"
#include "net.h"
#include "connection.h"
#include "subnet.h"
#include "system.h"
#include <utils.h>
#include <xalloc.h>
#include <rbl.h>
/* lists type of subnet */
rbltree_t *subnet_tree;
void init_subnets(void)
{
cp
subnet_tree = new_rbltree((rbl_compare_t)subnet_compare, (rbl_action_t)free_subnet);
cp
}
/* Subnet comparison */
int subnet_compare_mac(subnet_t *a, subnet_t *b)
{
cp
return memcmp(&a->net.mac.address, &b->net.mac.address, sizeof(mac_t));
}
int subnet_compare_ipv4(subnet_t *a, subnet_t *b)
{
cp
/* If the subnet of a falls within the range of subnet b,
then we consider a smaller then b.
Otherwise, the addresses alone (and not the subnet masks) will be compared.
*/
if(a->net.ipv4.mask > b->net.ipv4.mask)
if((a->net.ipv4.address & b->net.ipv4.mask) == b->net.ipv4.address)
return -1;
return a->net.ipv4.address - b->net.ipv4.address;
}
int subnet_compare_ipv6(subnet_t *a, subnet_t *b)
{
cp
/* Same as ipv4 case, but with nasty 128 bit addresses */
if(memcmp(&a->net.ipv6.mask, &b->net.ipv6.mask, sizeof(ipv6_t)) > 0)
if((a->net.ipv6.address.x[0] & b->net.ipv6.mask.x[0]) == b->net.ipv6.address.x[0] &&
(a->net.ipv6.address.x[1] & b->net.ipv6.mask.x[1]) == b->net.ipv6.address.x[1] &&
(a->net.ipv6.address.x[2] & b->net.ipv6.mask.x[2]) == b->net.ipv6.address.x[2] &&
(a->net.ipv6.address.x[3] & b->net.ipv6.mask.x[3]) == b->net.ipv6.address.x[3] &&
(a->net.ipv6.address.x[4] & b->net.ipv6.mask.x[4]) == b->net.ipv6.address.x[4] &&
(a->net.ipv6.address.x[5] & b->net.ipv6.mask.x[5]) == b->net.ipv6.address.x[5] &&
(a->net.ipv6.address.x[6] & b->net.ipv6.mask.x[6]) == b->net.ipv6.address.x[6] &&
(a->net.ipv6.address.x[7] & b->net.ipv6.mask.x[7]) == b->net.ipv6.address.x[7])
return -1;
return memcmp(&a->net.ipv6.address, &b->net.ipv6.address, sizeof(ipv6_t));
}
int subnet_compare(subnet_t *a, subnet_t *b)
{
int x;
cp
x = a->type - b->type;
if(x)
return x;
switch(a->type)
{
case SUBNET_MAC:
return subnet_compare_mac(a, b);
case SUBNET_IPV4:
return subnet_compare_ipv4(a, b);
case SUBNET_IPV6:
return subnet_compare_ipv6(a, b);
default:
syslog(LOG_ERR, _("subnet_compare() was called with unknown subnet type %d, restarting!"), a->type);
sighup = 1;
return 0;
}
}
/* Allocating and freeing space for subnets */
subnet_t *new_subnet(void)
{
cp
return (subnet_t *)xmalloc(sizeof(subnet_t));
}
void free_subnet(subnet_t *subnet)
{
cp
free(subnet);
}
/* Linked list management */
void subnet_add(connection_t *cl, subnet_t *subnet)
{
cp
subnet->owner = cl;
rbl_insert(subnet_tree, subnet);
rbl_insert(cl->subnet_tree, subnet);
cp
}
void subnet_del(subnet_t *subnet)
{
cp
rbl_delete(subnet->owner->subnet_tree, subnet);
cp
rbl_delete(subnet_tree, subnet);
cp
}
/* Ascii representation of subnets */
subnet_t *str2net(char *subnetstr)
{
int type;
subnet_t *subnet;
cp
if(sscanf(subnetstr, "%d,", &type) != 1)
return NULL;
cp
subnet = new_subnet();
cp
switch(type)
{
case SUBNET_MAC:
if(sscanf(subnetstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", &subnet->type,
&subnet->net.mac.address.x[0],
&subnet->net.mac.address.x[1],
&subnet->net.mac.address.x[2],
&subnet->net.mac.address.x[3],
&subnet->net.mac.address.x[4],
&subnet->net.mac.address.x[5]) != 7)
{
free_subnet(subnet);
return NULL;
}
break;
case SUBNET_IPV4:
if(sscanf(subnetstr, "%d,%lx/%lx", &subnet->type, &subnet->net.ipv4.address, &subnet->net.ipv4.mask) != 3)
{
free_subnet(subnet);
return NULL;
}
break;
case SUBNET_IPV6:
if(sscanf(subnetstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", &subnet->type,
&subnet->net.ipv6.address.x[0],
&subnet->net.ipv6.address.x[1],
&subnet->net.ipv6.address.x[2],
&subnet->net.ipv6.address.x[3],
&subnet->net.ipv6.address.x[4],
&subnet->net.ipv6.address.x[5],
&subnet->net.ipv6.address.x[6],
&subnet->net.ipv6.address.x[7],
&subnet->net.ipv6.mask.x[0],
&subnet->net.ipv6.mask.x[1],
&subnet->net.ipv6.mask.x[2],
&subnet->net.ipv6.mask.x[3],
&subnet->net.ipv6.mask.x[4],
&subnet->net.ipv6.mask.x[5],
&subnet->net.ipv6.mask.x[6],
&subnet->net.ipv6.mask.x[7]) != 17)
{
free_subnet(subnet);
return NULL;
}
break;
default:
free_subnet(subnet);
return NULL;
}
cp
return subnet;
}
char *net2str(subnet_t *subnet)
{
char *netstr;
cp
switch(subnet->type)
{
case SUBNET_MAC:
asprintf(&netstr, "%d,%hhx:%hhx:%hhx:%hhx:%hhx:%hhx", subnet->type,
subnet->net.mac.address.x[0],
subnet->net.mac.address.x[1],
subnet->net.mac.address.x[2],
subnet->net.mac.address.x[3],
subnet->net.mac.address.x[4],
subnet->net.mac.address.x[5]);
break;
case SUBNET_IPV4:
asprintf(&netstr, "%d,%lx/%lx", subnet->type, subnet->net.ipv4.address, subnet->net.ipv4.mask);
break;
case SUBNET_IPV6:
asprintf(&netstr, "%d,%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx/%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", subnet->type,
subnet->net.ipv6.address.x[0],
subnet->net.ipv6.address.x[1],
subnet->net.ipv6.address.x[2],
subnet->net.ipv6.address.x[3],
subnet->net.ipv6.address.x[4],
subnet->net.ipv6.address.x[5],
subnet->net.ipv6.address.x[6],
subnet->net.ipv6.address.x[7],
subnet->net.ipv6.mask.x[0],
subnet->net.ipv6.mask.x[1],
subnet->net.ipv6.mask.x[2],
subnet->net.ipv6.mask.x[3],
subnet->net.ipv6.mask.x[4],
subnet->net.ipv6.mask.x[5],
subnet->net.ipv6.mask.x[6],
subnet->net.ipv6.mask.x[7]);
break;
default:
asprintf(&netstr, _("unknown"));
}
cp
return netstr;
}
/* Subnet lookup routines */
subnet_t *lookup_subnet_mac(mac_t address)
{
subnet_t subnet, *p;
cp
subnet.type = SUBNET_MAC;
subnet.net.mac.address = address;
p = (subnet_t *)rbl_search_closest(subnet_tree, &subnet);
cp
if(p && !memcmp(&address, &p->net.mac.address, sizeof(mac_t)))
return p;
else
return NULL;
}
subnet_t *lookup_subnet_ipv4(ipv4_t address)
{
subnet_t subnet, *p;
cp
subnet.type = SUBNET_IPV4;
subnet.net.ipv4.address = address;
subnet.net.ipv4.mask = 0xFFFFFFFF;
p = (subnet_t *)rbl_search_closest_greater(subnet_tree, &subnet);
/* Check if the found subnet REALLY matches */
cp
if(p && ((address & p->net.ipv4.mask) == p->net.ipv4.address))
return p;
else
return NULL;
}
subnet_t *lookup_subnet_ipv6(ipv6_t address)
{
subnet_t subnet;
cp
subnet.type = SUBNET_IPV6;
subnet.net.ipv6.address = address;
memset(&subnet.net.ipv6.mask, 0xFF, 16);
/* FIXME: check if it REALLY matches */
return (subnet_t *)rbl_search_closest(subnet_tree, &subnet);
}
void dump_subnet_list(void)
{
char *netstr;
subnet_t *subnet;
rbl_t *rbl;
cp
syslog(LOG_DEBUG, _("Subnet list:"));
RBL_FOREACH(subnet_tree, rbl)
{
subnet = (subnet_t *)rbl->data;
netstr = net2str(subnet);
syslog(LOG_DEBUG, " %s owner %s", netstr, subnet->owner->name);
free(netstr);
}
syslog(LOG_DEBUG, _("End of subnet list."));
cp
}
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