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/*
* ZeroTier One - Global Peer to Peer Ethernet
* Copyright (C) 2011-2014 ZeroTier Networks LLC
*
* This program 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
* (at your option) any later version.
*
* 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. If not, see <http://www.gnu.org/licenses/>.
*
* --
*
* ZeroTier may be used and distributed under the terms of the GPLv3, which
* are available at: http://www.gnu.org/licenses/gpl-3.0.html
*
* If you would like to embed ZeroTier into a commercial application or
* redistribute it in a modified binary form, please contact ZeroTier Networks
* LLC. Start here: http://www.zerotier.com/
*/
#ifndef ZT_UDPSOCKET_HPP
#define ZT_UDPSOCKET_HPP
#include <stdexcept>
#include "Constants.hpp"
#include "Thread.hpp"
#include "InetAddress.hpp"
#include "Mutex.hpp"
#ifdef __WINDOWS__
#include <WinSock2.h>
#endif
namespace ZeroTier {
/**
* A local UDP socket
*
* The socket listens in a background thread and sends packets to Switch.
*/
class UdpSocket
{
public:
/**
* Create and bind a local UDP socket
*
* @param localOnly If true, bind to loopback address only
* @param localPort Local port to listen to
* @param ipv6 If true, bind this as an IPv6 socket, otherwise IPv4
* @param packetHandler Function to call when packets are read
* @param arg First argument (after self) to function
* @throws std::runtime_error Unable to bind
*/
UdpSocket(
bool localOnly,
int localPort,
bool ipv6,
void (*packetHandler)(UdpSocket *,void *,const InetAddress &,const void *,unsigned int),
void *arg)
throw(std::runtime_error);
~UdpSocket();
/**
* @return Locally bound port
*/
inline int localPort() const throw() { return _localPort; }
/**
* @return True if this is an IPv6 socket
*/
inline bool v6() const throw() { return _v6; }
/**
* Send a packet
*
* Attempt to send V6 on a V4 or V4 on a V6 socket will return false.
*
* @param to Destination IP/port
* @param data Data to send
* @param len Length of data in bytes
* @param hopLimit IP hop limit for UDP packet or -1 for max (max: 255)
* @return True if packet successfully sent to link layer
*/
bool send(const InetAddress &to,const void *data,unsigned int len,int hopLimit)
throw();
/**
* Thread main method; do not call elsewhere
*/
void threadMain()
throw();
private:
Thread _thread;
void (*_packetHandler)(UdpSocket *,void *,const InetAddress &,const void *,unsigned int);
void *_arg;
int _localPort;
#ifdef __WINDOWS__
volatile SOCKET _sock;
#else
volatile int _sock;
#endif
bool _v6;
Mutex _sendLock;
};
} // namespace ZeroTier
#endif
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