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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) 2007-2008 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 version 3 as
* published by the Free Software Foundation.
*
* 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/bind.hpp>
#include <boost/system/error_code.hpp>
#include "resolver.h"
#include "log.h"
using ::boost::asio::ip::udp;
using ::boost::asio::ip::tcp;
template<class Proto>
void waitAndEnqueue(u_int32_t s, const std::string& addr, const std::string& port, boost::function<void(boost::asio::ip::basic_endpoint<Proto>)> const& onResolve, ResolvAddrType r)
{
cLog.msg(Log::PRIO_ERROR) << "the resolver only supports udp and tcp";
}
template<>
void waitAndEnqueue(u_int32_t s, const std::string& addr, const std::string& port, boost::function<void(boost::asio::ip::basic_endpoint<udp>)> const& onResolve, ResolvAddrType r)
{
boost::this_thread::sleep(boost::posix_time::milliseconds(s * 1000));
gResolver.resolveUdp(addr, port, onResolve, r);
}
template<>
void waitAndEnqueue(u_int32_t s, const std::string& addr, const std::string& port, boost::function<void(boost::asio::ip::basic_endpoint<tcp>)> const& onResolve, ResolvAddrType r)
{
boost::this_thread::sleep(boost::posix_time::milliseconds(s * 1000));
gResolver.resolveTcp(addr, port, onResolve, r);
}
template<class Proto>
ResolveHandler<Proto>::ResolveHandler(const std::string& addr, const std::string& port, boost::function<void(boost::asio::ip::basic_endpoint<Proto>)> const& onResolve, ResolvAddrType r) : addr_(addr), port_(port), callback_(onResolve), resolv_addr_type_(r)
{
}
template<class Proto>
void ResolveHandler<Proto>::operator()(const boost::system::error_code& e, const boost::asio::ip::basic_resolver_iterator<Proto> endpointIt)
{
if(boost::system::posix_error::success == e) {
callback_(*endpointIt);
} else {
cLog.msg(Log::PRIO_ERROR) << "Error while resolving '" << addr_ << "' '" << port_ << "', retrying in 10 sec.";
boost::thread(boost::bind(waitAndEnqueue<Proto>, 10, addr_, port_, callback_, resolv_addr_type_));
}
}
Resolver* Resolver::inst = NULL;
Mutex Resolver::instMutex;
Resolver& gResolver = Resolver::instance();
Resolver& Resolver::instance()
{
Lock lock(instMutex);
static instanceCleaner c;
if(!inst)
inst = new Resolver();
return *inst;
}
Resolver::Resolver() : udp_resolver_(io_service_), tcp_resolver_(io_service_), thread_(NULL)
{
}
Resolver::~Resolver()
{
if(thread_)
delete thread_;
}
void Resolver::init()
{
if(!thread_)
thread_ = new boost::thread(boost::bind(&Resolver::run, this));
}
void Resolver::run()
{
cLog.msg(Log::PRIO_DEBUG) << "Resolver Thread started";
while(1) {
try {
io_service_.run();
io_service_.reset();
boost::this_thread::sleep(boost::posix_time::milliseconds(250));
}
catch(const std::runtime_error& e)
{
cLog.msg(Log::PRIO_ERROR) << "resolver caught runtime error, restarting: " << e.what();
}
catch(const std::exception& e)
{
cLog.msg(Log::PRIO_ERROR) << "resolver caught exception, restarting: " << e.what();
}
}
}
void Resolver::resolveUdp(const std::string& addr, const std::string& port, boost::function<void (udp::endpoint)> const& onResolve, ResolvAddrType r)
{
cLog.msg(Log::PRIO_DEBUG) << "trying to resolv UDP: '" << addr << "' '" << port << "'";
std::auto_ptr<udp::resolver::query> query;
if(addr != "") {
switch(r) {
case IPV4_ONLY: query = std::auto_ptr<udp::resolver::query>(new udp::resolver::query(udp::v4(), addr, port)); break;
case IPV6_ONLY: query = std::auto_ptr<udp::resolver::query>(new udp::resolver::query(udp::v6(), addr, port)); break;
default: query = std::auto_ptr<udp::resolver::query>(new udp::resolver::query(addr, port)); break;
}
}
else {
switch(r) {
case IPV4_ONLY: query = std::auto_ptr<udp::resolver::query>(new udp::resolver::query(udp::v4(), port)); break;
case IPV6_ONLY: query = std::auto_ptr<udp::resolver::query>(new udp::resolver::query(udp::v6(), port)); break;
default: query = std::auto_ptr<udp::resolver::query>(new udp::resolver::query(port)); break;
}
}
UdpResolveHandler handler(addr, port, onResolve, r);
udp_resolver_.async_resolve(*query, handler);
}
void Resolver::resolveTcp(const std::string& addr, const std::string& port, boost::function<void (tcp::endpoint)> const& onResolve, ResolvAddrType r)
{
cLog.msg(Log::PRIO_DEBUG) << "trying to resolv TCP: '" << addr << "' '" << port << "'";
std::auto_ptr<tcp::resolver::query> query;
if(addr != "") {
switch(r) {
case IPV4_ONLY: query = std::auto_ptr<tcp::resolver::query>(new tcp::resolver::query(tcp::v4(), addr, port)); break;
case IPV6_ONLY: query = std::auto_ptr<tcp::resolver::query>(new tcp::resolver::query(tcp::v6(), addr, port)); break;
default: query = std::auto_ptr<tcp::resolver::query>(new tcp::resolver::query(addr, port)); break;
}
}
else {
switch(r) {
case IPV4_ONLY: query = std::auto_ptr<tcp::resolver::query>(new tcp::resolver::query(tcp::v4(), port)); break;
case IPV6_ONLY: query = std::auto_ptr<tcp::resolver::query>(new tcp::resolver::query(tcp::v6(), port)); break;
default: query = std::auto_ptr<tcp::resolver::query>(new tcp::resolver::query(port)); break;
}
}
TcpResolveHandler handler(addr, port, onResolve, r);
tcp_resolver_.async_resolve(*query, handler);
}
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