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/*
* uAnytun
*
* uAnytun is a tiny implementation of SATP. Unlike Anytun which is a full
* featured implementation uAnytun has no support for multiple connections
* or synchronisation. It is a small single threaded implementation intended
* to act as a client on small platforms.
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methodes used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007-2008 Christian Pointner <equinox@anytun.org>
*
* This file is part of uAnytun.
*
* uAnytun 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 3 of the License, or
* any later version.
*
* uAnytun 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 uAnytun. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef UANYTUN_tun_helper_h_INCLUDED
#define UANYTUN_tun_helper_h_INCLUDED
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
void tun_conf(tun_device_t* dev, const char* dev_name, const char* dev_type, const char* ifcfg_addr, u_int16_t ifcfg_prefix, u_int16_t mtu)
{
if(!dev) return;
dev->mtu_ = mtu;
dev->type_ = TYPE_UNDEF;
if(dev_type) {
if(!strncmp(dev_type, "tun", 3))
dev->type_ = TYPE_TUN;
else if (!strncmp(dev_type, "tap", 3))
dev->type_ = TYPE_TAP;
}
else if(dev_name) {
if(!strncmp(dev_name, "tun", 3))
dev->type_ = TYPE_TUN;
else if(!strncmp(dev_name, "tap", 3))
dev->type_ = TYPE_TAP;
}
dev->net_addr_ = NULL;
dev->net_mask_ = NULL;
dev->prefix_length_ = 0;
if(ifcfg_addr) {
dev->net_addr_ = strdup(ifcfg_addr);
dev->prefix_length_ = ifcfg_prefix;
u_int32_t mask = 0;
u_int16_t i = 0;
for(i = 0; i < ifcfg_prefix; ++i) {
mask = mask >> 1;
mask |= 0x80000000L;
}
struct in_addr addr;
addr.s_addr = ntohl(mask);
dev->net_mask_ = strdup(inet_ntoa(addr));
}
}
int tun_fix_return(int ret, size_t pi_length)
{
if(ret < 0)
return ret;
return ((size_t)ret > pi_length ? (ret - pi_length) : 0);
}
const char* tun_get_type_string(tun_device_t* dev)
{
if(!dev || dev->fd_ < 0)
return "";
switch(dev->type_)
{
case TYPE_UNDEF: return "undef"; break;
case TYPE_TUN: return "tun"; break;
case TYPE_TAP: return "tap"; break;
}
return "";
}
#endif
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