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/*
* anytun
*
* 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 anytun.org <satp@wirdorange.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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 (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <iostream>
#include <poll.h>
#include "datatypes.h"
#include "log.h"
#include "buffer.h"
#include "packet.h"
#include "cypher.h"
#include "authAlgo.h"
#include "signalController.h"
#include "packetSource.h"
#include "tunDevice.h"
sender_id_t my_sender_id_ = 23;
u_int16_t local_port_ = 4444;
string remote_addr_ = "127.0.0.1";
u_int16_t remote_port_ = 4444;
string dev_type_ = "tap";
string ifconfig_param_1_ = "192.168.200.1";
string ifconfig_param_2_ = "255.255.255.0";
#define PAYLOAD_TYPE_TAP 0x6558
#define PAYLOAD_TYPE_TUN 0x0800
struct Param
{
TunDevice* dev;
Cypher* c;
AuthAlgo* a;
PacketSource* src;
};
void* sender(void* p)
{
Param* param = reinterpret_cast<Param*>(p);
seq_nr_t seq = 0;
while(1)
{
Packet pack(1600);
// read packet from device
int len = param->dev->read(pack);
pack.resizeBack(len);
// add payload type
if(param->dev->getType() == TunDevice::TYPE_TUN)
pack.addPayloadType(PAYLOAD_TYPE_TUN);
else if(param->dev->getType() == TunDevice::TYPE_TAP)
pack.addPayloadType(PAYLOAD_TYPE_TAP);
else
pack.addPayloadType(0);
// cypher the packet
param->c->cypher(pack);
// add header to packet
pack.addHeader(my_sender_id_, seq);
// calc auth_tag and add it to the packet
auth_tag_t at = param->a->calc(pack);
pack.addAuthTag(at);
// send it out to remote host
param->src->send(pack, remote_addr_, remote_port_);
}
pthread_exit(NULL);
}
void* receiver(void* p)
{
Param* param = reinterpret_cast<Param*>(p);
while(1)
{
string remote_host;
u_int16_t remote_port;
Packet pack(1600);
// read packet from socket
int len = param->src->recv(pack, remote_host, remote_port);
pack.resizeBack(len);
// check auth_tag and remove it
auth_tag_t at = param->a->calc(pack);
if(at != pack.getAuthTag())
continue;
// compare sender_id and seq with window
pack.removeHeader();
// decypher the packet
param->c->cypher(pack);
// check payload_type and remove it
if((param->dev->getType() == TunDevice::TYPE_TUN && pack.getPayloadType() != PAYLOAD_TYPE_TUN) ||
(param->dev->getType() == TunDevice::TYPE_TAP && pack.getPayloadType() != PAYLOAD_TYPE_TAP))
continue;
pack.removePayloadType();
// write it on the device
param->dev->write(pack);
}
pthread_exit(NULL);
}
int main(int argc, char* argv[])
{
std::cout << "anytun - secure anycast tunneling protocol" << std::endl;
cLog.msg(Log::PRIO_NOTICE) << "anytun started...";
if(argc > 1)
my_sender_id_ = atoi(argv[1]);
if(argc > 2)
local_port_ = atoi(argv[2]);
if(argc > 3)
remote_addr_ = argv[3];
if(argc > 4)
remote_port_ = atoi(argv[4]);
if(argc > 5)
dev_type_ = argv[5];
if(argc > 6)
ifconfig_param_1_ = argv[6];
if(argc > 7)
ifconfig_param_2_ = argv[7];
SignalController sig;
sig.init();
struct Param p;
p.dev = new TunDevice(dev_type_.c_str(), ifconfig_param_1_.c_str(), ifconfig_param_2_.c_str());
p.c = new NullCypher();
p.a = new NullAuthAlgo();
p.src = new UDPPacketSource(local_port_);
std::cout << "dev created (opened)" << std::endl;
std::cout << "dev opened - actual name is '" << p.dev->getActualName() << "'" << std::endl;
std::cout << "dev type is '" << p.dev->getTypeString() << "'" << std::endl;
pthread_t senderThread;
pthread_create(&senderThread, NULL, sender, &p);
pthread_t receiverThread;
pthread_create(&receiverThread, NULL, receiver, &p);
int ret = sig.run();
pthread_cancel(senderThread);
pthread_cancel(receiverThread);
pthread_join(senderThread, NULL);
pthread_join(receiverThread, NULL);
delete p.dev;
delete p.c;
delete p.a;
delete p.src;
return ret;
}
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