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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) 2007-2009 Othmar Gsenger, Erwin Nindl,
* Christian Pointner <satp@wirdorange.org>
*
* This file is part of Anytun.
*
* Anytun 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.
*
* Anytun 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 anytun. If not, see <http://www.gnu.org/licenses/>.
*/
#include <boost/asio.hpp>
#include <boost/bind.hpp>
#include <boost/thread.hpp>
#include "datatypes.h"
#include "packetSource.h"
#include "log.h"
#include "resolver.h"
#include "options.h"
#include "signalController.h"
#include "anytunError.h"
void PacketSource::waitUntilReady()
{
ready_sem_.down();
}
UDPPacketSource::UDPPacketSource(std::string localaddr, std::string port)
{
gResolver.resolveUdp(localaddr, port, boost::bind(&UDPPacketSource::onResolve, this, _1), boost::bind(&UDPPacketSource::onError, this, _1), gOpt.getResolvAddrType());
}
UDPPacketSource::~UDPPacketSource()
{
std::list<sockets_element_t>::iterator it = sockets_.begin();
for(;it != sockets_.end(); ++it) {
/// this might be a needed by the receiver thread, TODO cleanup
// delete[](it->buf_);
// delete(it->sem_);
// delete(it->sock_);
}
}
void UDPPacketSource::onResolve(PacketSourceResolverIt& it)
{
while(it != PacketSourceResolverIt()) {
PacketSourceEndpoint e = *it;
cLog.msg(Log::PRIO_NOTICE) << "opening socket: " << e;
sockets_element_t sock;
sock.buf_ = NULL;
sock.len_ = 0;
sock.sem_ = NULL;
sock.sock_ = new proto::socket(io_service_);
if(!sock.sock_)
AnytunError::throwErr() << "memory error";
sock.sock_->open(e.protocol());
#ifndef _MSC_VER
if(e.protocol() == proto::v6()) {
boost::asio::ip::v6_only option(true);
sock.sock_->set_option(option);
}
#endif
sock.sock_->bind(e);
sockets_.push_back(sock);
it++;
}
// prepare multi-socket recv
if(sockets_.size() > 1) {
std::list<sockets_element_t>::iterator it = sockets_.begin();
for(;it != sockets_.end(); ++it) {
it->len_ = 1600; // TODO packet size
it->buf_ = new u_int8_t[it->len_];
if(!it->buf_)
AnytunError::throwErr() << "memory error";
it->sem_ = new Semaphore();
if(!it->sem_) {
delete[](it->buf_);
AnytunError::throwErr() << "memory error";
}
boost::thread(boost::bind(&UDPPacketSource::recv_thread, this, it));
it->sem_->up();
}
}
ready_sem_.up();
}
void UDPPacketSource::onError(const std::runtime_error& e)
{
gSignalController.inject(SIGERROR, e.what());
}
void UDPPacketSource::recv_thread(std::list<sockets_element_t>::iterator it)
{
cLog.msg(Log::PRIO_DEBUG) << "started receiver thread for " << it->sock_->local_endpoint();
thread_result_t result;
result.it_ = it;
for(;;) {
it->sem_->down();
cLog.msg(Log::PRIO_DEBUG) << "calling recv() for " << it->sock_->local_endpoint();
result.len_ = static_cast<u_int32_t>(it->sock_->receive_from(boost::asio::buffer(it->buf_, it->len_), result.remote_));
{
Lock lock(thread_result_mutex_);
thread_result_queue_.push(result);
}
thread_result_sem_.up();
}
}
u_int32_t UDPPacketSource::recv(u_int8_t* buf, u_int32_t len, PacketSourceEndpoint& remote)
{
if(sockets_.size() == 1)
return static_cast<u_int32_t>(sockets_.front().sock_->receive_from(boost::asio::buffer(buf, len), remote));
thread_result_sem_.down();
thread_result_t result;
{
Lock lock(thread_result_mutex_);
result = thread_result_queue_.front();
thread_result_queue_.pop();
}
remote = result.remote_;
std::memcpy(buf, result.it_->buf_, (len < result.len_) ? len : result.len_);
len = (len < result.len_) ? len : result.len_;
result.it_->sem_->up();
return len;
}
void UDPPacketSource::send(u_int8_t* buf, u_int32_t len, PacketSourceEndpoint remote)
{
std::list<sockets_element_t>::iterator it = sockets_.begin();
for(;it != sockets_.end(); ++it) {
if(it->sock_->local_endpoint().protocol() == remote.protocol()) {
it->sock_->send_to(boost::asio::buffer(buf, len), remote);
return;
}
}
cLog.msg(Log::PRIO_WARNING) << "no suitable socket found for remote endpoint protocol: " << remote;
}
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