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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/
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#include <sys/types.h>
#include "Constants.hpp"
#include "UdpSocket.hpp"
#include "SocketManager.hpp"
#ifdef __WINDOWS__
#include <WinSock2.h>
#include <WS2tcpip.h>
#include <Windows.h>
#else
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <signal.h>
#endif
// Uncomment to intentionally break UDP in order to test TCP fallback
// This is here so I can commit it to the repo and drive myself insane.
//#define ZT_BREAK_UDP
namespace ZeroTier {
UdpSocket::~UdpSocket()
{
#ifdef __WINDOWS__
::closesocket(_sock);
#else
::close(_sock);
#endif
}
bool UdpSocket::send(const InetAddress &to,const void *msg,unsigned int msglen)
{
return sendWithHopLimit(to,msg,msglen,0);
}
bool UdpSocket::sendWithHopLimit(const InetAddress &to,const void *msg,unsigned int msglen,int hopLimit)
{
#ifdef ZT_BREAK_UDP
return true;
#else
if (hopLimit <= 0)
hopLimit = 255;
if (to.isV6()) {
#ifdef __WINDOWS__
DWORD hltmp = (DWORD)hopLimit;
setsockopt(_sock,IPPROTO_IPV6,IPV6_UNICAST_HOPS,(const char *)&hltmp,sizeof(hltmp));
return ((int)sendto(_sock,(const char *)msg,msglen,0,to.saddr(),to.saddrLen()) == (int)msglen);
#else
setsockopt(_sock,IPPROTO_IPV6,IPV6_UNICAST_HOPS,&hopLimit,sizeof(hopLimit));
return ((int)sendto(_sock,msg,msglen,0,to.saddr(),to.saddrLen()) == (int)msglen);
#endif
} else {
#ifdef __WINDOWS__
DWORD hltmp = (DWORD)hopLimit;
setsockopt(_sock,IPPROTO_IP,IP_TTL,(const char *)&hltmp,sizeof(hltmp));
return ((int)sendto(_sock,(const char *)msg,msglen,0,to.saddr(),to.saddrLen()) == (int)msglen);
#else
setsockopt(_sock,IPPROTO_IP,IP_TTL,&hopLimit,sizeof(hopLimit));
return ((int)sendto(_sock,msg,msglen,0,to.saddr(),to.saddrLen()) == (int)msglen);
#endif
}
#endif
}
bool UdpSocket::notifyAvailableForRead(const SharedPtr<Socket> &self,SocketManager *sm)
{
Buffer<ZT_SOCKET_MAX_MESSAGE_LEN> buf;
InetAddress from;
socklen_t salen = from.saddrSpaceLen();
int n = (int)recvfrom(_sock,(char *)(buf.data()),ZT_SOCKET_MAX_MESSAGE_LEN,0,from.saddr(),&salen);
if (n > 0) {
buf.setSize((unsigned int)n);
#ifndef ZT_BREAK_UDP
sm->handleReceivedPacket(self,from,buf);
#endif
}
return true;
}
bool UdpSocket::notifyAvailableForWrite(const SharedPtr<Socket> &self,SocketManager *sm)
{
return true;
}
} // namespace ZeroTier
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