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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"
#include "options.h"
#include "seqWindow.h"
#define PAYLOAD_TYPE_TAP 0x6558
#define PAYLOAD_TYPE_TUN 0x0800
struct Param
{
Options& opt;
TunDevice& dev;
Cypher& c;
AuthAlgo& a;
PacketSource& src;
SeqWindow& seq;
};
void* sender(void* p)
{
Param* param = reinterpret_cast<Param*>(p);
seq_nr_t seq = 0;
while(1)
{
Packet pack(1600); // fix me... mtu size
// read packet from device
int len = param->dev.read(pack);
pack.resizeBack(len);
if(param->opt.getRemoteAddr() == "")
continue;
// 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, seq, param->opt.getSenderId());
// add header to packet
pack.addHeader(seq, param->opt.getSenderId());
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, param->opt.getRemoteAddr(), param->opt.getRemotePort());
}
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); // fix me... mtu size
// read packet from socket
u_int32_t len = param->src.recv(pack, remote_host, remote_port);
pack.resizeBack(len);
pack.withPayloadType(true).withHeader(true).withAuthTag(true);
// check auth_tag and remove it
auth_tag_t at = pack.getAuthTag();
pack.removeAuthTag();
if(at != param->a.calc(pack))
continue;
// autodetect peer
if(param->opt.getRemoteAddr() == "")
{
param->opt.setRemoteAddrPort(remote_host, remote_port);
cLog.msg(Log::PRIO_NOTICE) << "autodetected remote host " << remote_host << ":" << remote_port;
}
// compare sender_id and seq with window
if(param->seq.hasSeqNr(pack.getSenderId(), pack.getSeqNr()))
continue;
param->seq.addSeqNr(pack.getSenderId(), pack.getSeqNr());
pack.removeHeader();
// decypher the packet
param->c.cypher(pack, pack.getSeqNr(), pack.getSenderId());
// 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;
Options opt;
if(!opt.parse(argc, argv))
{
opt.printUsage();
exit(-1);
}
cLog.msg(Log::PRIO_NOTICE) << "anytun started...";
SignalController sig;
sig.init();
TunDevice dev(opt.getDevName().c_str(), opt.getIfconfigParamLocal().c_str(), opt.getIfconfigParamRemoteNetmask().c_str());
SeqWindow seq(opt.getSeqWindowSize());
// NullCypher c;
AesIcmCypher c;
NullAuthAlgo a;
PacketSource* src;
if(opt.getLocalAddr() == "")
src = new UDPPacketSource(opt.getLocalPort());
else
src = new UDPPacketSource(opt.getLocalAddr(), opt.getLocalPort());
struct Param p = {opt, dev, c, a, *src, seq};
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 src;
return ret;
}
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