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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 methods 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) 2007-2014 Markus Grüneis, 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/>.
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
#include <boost/bind.hpp>
#define BOOST_SYSTEM_ENABLE_DEPRECATED
#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(uint32_t s, const std::string& addr, const std::string& port, boost::function<void(boost::asio::ip::basic_resolver_iterator<Proto>)> const& onResolve, ErrorCallback const& onError, ResolvAddrType r)
{
cLog.msg(Log::PRIO_ERROR) << "the resolver only supports udp and tcp";
}
template<>
void waitAndEnqueue(uint32_t s, const std::string& addr, const std::string& port, boost::function<void(boost::asio::ip::basic_resolver_iterator<udp>)> const& onResolve, ErrorCallback const& onError, ResolvAddrType r)
{
boost::this_thread::sleep(boost::posix_time::milliseconds(s * 1000));
gResolver.resolveUdp(addr, port, onResolve, onError, r);
}
template<>
void waitAndEnqueue(uint32_t s, const std::string& addr, const std::string& port, boost::function<void(boost::asio::ip::basic_resolver_iterator<tcp>)> const& onResolve, ErrorCallback const& onError, ResolvAddrType r)
{
boost::this_thread::sleep(boost::posix_time::milliseconds(s * 1000));
gResolver.resolveTcp(addr, port, onResolve, onError, r);
}
template<class Proto>
ResolveHandler<Proto>::ResolveHandler(const std::string& addr, const std::string& port, boost::function<void(boost::asio::ip::basic_resolver_iterator<Proto>)> const& onResolve, ErrorCallback const& onError, ResolvAddrType r) : addr_(addr), port_(port), onResolve_(onResolve), onError_(onError), resolv_addr_type_(r)
{
}
template<class Proto>
void ResolveHandler<Proto>::operator()(const boost::system::error_code& e, boost::asio::ip::basic_resolver_iterator<Proto> endpointIt)
{
if(boost::system::posix_error::success == e) {
try {
onResolve_(endpointIt);
} catch(const std::runtime_error& e) {
onError_(e);
}
} else {
cLog.msg(Log::PRIO_ERROR) << "Error while resolving '" << addr_ << "' '" << port_ << "', retrying in 10 sec.";
boost::thread(boost::bind(waitAndEnqueue<Proto>, 10, addr_, port_, onResolve_, onError_, resolv_addr_type_));
}
}
Resolver& gResolver = Resolver::instance();
Resolver& Resolver::instance()
{
static Resolver instance;
return instance;
}
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";
for(;;) {
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, UdpResolveCallback const& onResolve, ErrorCallback const& onError, ResolvAddrType r)
{
cLog.msg(Log::PRIO_DEBUG) << "trying to resolv UDP: '" << addr << "' '" << port << "'";
boost::shared_ptr<udp::resolver::query> query;
if(addr != "") {
switch(r) {
case IPV4_ONLY:
query = boost::shared_ptr<udp::resolver::query>(new udp::resolver::query(udp::v4(), addr, port));
break;
case IPV6_ONLY:
query = boost::shared_ptr<udp::resolver::query>(new udp::resolver::query(udp::v6(), addr, port));
break;
default:
query = boost::shared_ptr<udp::resolver::query>(new udp::resolver::query(addr, port));
break;
}
} else {
switch(r) {
case IPV4_ONLY:
query = boost::shared_ptr<udp::resolver::query>(new udp::resolver::query(udp::v4(), port));
break;
case IPV6_ONLY:
query = boost::shared_ptr<udp::resolver::query>(new udp::resolver::query(udp::v6(), port));
break;
default:
query = boost::shared_ptr<udp::resolver::query>(new udp::resolver::query(port));
break;
}
}
UdpResolveHandler handler(addr, port, onResolve, onError, r);
udp_resolver_.async_resolve(*query, handler);
}
void Resolver::resolveTcp(const std::string& addr, const std::string& port, TcpResolveCallback const& onResolve, ErrorCallback const& onError, ResolvAddrType r)
{
cLog.msg(Log::PRIO_DEBUG) << "trying to resolv TCP: '" << addr << "' '" << port << "'";
boost::shared_ptr<tcp::resolver::query> query;
if(addr != "") {
switch(r) {
case IPV4_ONLY:
query = boost::shared_ptr<tcp::resolver::query>(new tcp::resolver::query(tcp::v4(), addr, port));
break;
case IPV6_ONLY:
query = boost::shared_ptr<tcp::resolver::query>(new tcp::resolver::query(tcp::v6(), addr, port));
break;
default:
query = boost::shared_ptr<tcp::resolver::query>(new tcp::resolver::query(addr, port));
break;
}
} else {
switch(r) {
case IPV4_ONLY:
query = boost::shared_ptr<tcp::resolver::query>(new tcp::resolver::query(tcp::v4(), port));
break;
case IPV6_ONLY:
query = boost::shared_ptr<tcp::resolver::query>(new tcp::resolver::query(tcp::v6(), port));
break;
default:
query = boost::shared_ptr<tcp::resolver::query>(new tcp::resolver::query(port));
break;
}
}
TcpResolveHandler handler(addr, port, onResolve, onError, r);
tcp_resolver_.async_resolve(*query, handler);
}
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