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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)
{
last_recv_sock_.buf_ = NULL;
last_recv_sock_.len_ = 0;
last_recv_sock_.sock_ = NULL;
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) {
delete[](it->buf_);
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.sock_ = new proto::socket(io_service_);
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++;
}
ready_sem_.up();
}
void UDPPacketSource::onError(const std::runtime_error& e)
{
gSignalController.inject(SIGERROR, e.what());
}
void UDPPacketSource::recv_thread(thread_result_t result)
{
cLog.msg(Log::PRIO_DEBUG) << "started receiver thread for " << result.sock_->local_endpoint();
result.len_ = static_cast<u_int32_t>(result.sock_->receive_from(boost::asio::buffer(result.buf_, result.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_.begin()->sock_->receive_from(boost::asio::buffer(buf, len), remote));
if(!last_recv_sock_.sock_) {
std::list<sockets_element_t>::iterator it = sockets_.begin();
for(;it != sockets_.end(); ++it) {
if(it == sockets_.begin()) {
it->buf_ = buf;
it->len_ = len;
}
else {
it->buf_ = new u_int8_t[len];
if(!it->buf_)
AnytunError::throwErr() << "memory error";
it->len_ = len;
}
thread_result_t result;
result.buf_ = it->buf_;
result.len_ = it->len_;
result.sock_ = it->sock_;
boost::thread(boost::bind(&UDPPacketSource::recv_thread, this, result));
}
}
else {
thread_result_t result;
result.buf_ = last_recv_sock_.buf_;
result.len_ = last_recv_sock_.len_;
result.sock_ = last_recv_sock_.sock_;
boost::thread(boost::bind(&UDPPacketSource::recv_thread, this, result));
}
thread_result_sem_.down();
thread_result_t result;
{
Lock lock(thread_result_mutex_);
result = thread_result_queue_.front();
thread_result_queue_.pop();
}
last_recv_sock_.sock_ = result.sock_;
last_recv_sock_.buf_ = result.buf_;
last_recv_sock_.len_ = result.len_;
remote = result.remote_;
if(result.sock_ != sockets_.begin()->sock_) {
std::memcpy(buf, result.buf_, (len < result.len_) ? len : result.len_);
return (len < result.len_) ? len : result.len_;
}
return result.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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