mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-24 07:06:39 +00:00
121 lines
3.4 KiB
C++
121 lines
3.4 KiB
C++
/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2011-2014 ZeroTier Networks LLC
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* --
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*
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* ZeroTier may be used and distributed under the terms of the GPLv3, which
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* are available at: http://www.gnu.org/licenses/gpl-3.0.html
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*
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* If you would like to embed ZeroTier into a commercial application or
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* redistribute it in a modified binary form, please contact ZeroTier Networks
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* LLC. Start here: http://www.zerotier.com/
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <time.h>
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#include <errno.h>
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#include <sys/types.h>
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#include "Constants.hpp"
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#include "UdpSocket.hpp"
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#include "SocketManager.hpp"
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#ifdef __WINDOWS__
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#include <WinSock2.h>
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#include <WS2tcpip.h>
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#include <Windows.h>
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#else
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#include <unistd.h>
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#include <sys/socket.h>
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#include <arpa/inet.h>
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#include <signal.h>
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#endif
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// Uncomment to intentionally break UDP in order to test TCP fallback
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// This is here so I can commit it to the repo and drive myself insane.
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//#define ZT_BREAK_UDP
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namespace ZeroTier {
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UdpSocket::~UdpSocket()
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{
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#ifdef __WINDOWS__
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::closesocket(_sock);
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#else
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::close(_sock);
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#endif
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}
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bool UdpSocket::send(const InetAddress &to,const void *msg,unsigned int msglen)
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{
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return sendWithHopLimit(to,msg,msglen,0);
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}
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bool UdpSocket::sendWithHopLimit(const InetAddress &to,const void *msg,unsigned int msglen,int hopLimit)
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{
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#ifdef ZT_BREAK_UDP
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return true;
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#else
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if (hopLimit <= 0)
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hopLimit = 255;
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if (to.isV6()) {
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#ifdef __WINDOWS__
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DWORD hltmp = (DWORD)hopLimit;
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setsockopt(_sock,IPPROTO_IPV6,IPV6_UNICAST_HOPS,(const char *)&hltmp,sizeof(hltmp));
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return ((int)sendto(_sock,(const char *)msg,msglen,0,to.saddr(),to.saddrLen()) == (int)msglen);
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#else
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setsockopt(_sock,IPPROTO_IPV6,IPV6_UNICAST_HOPS,&hopLimit,sizeof(hopLimit));
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return ((int)sendto(_sock,msg,msglen,0,to.saddr(),to.saddrLen()) == (int)msglen);
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#endif
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} else {
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#ifdef __WINDOWS__
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DWORD hltmp = (DWORD)hopLimit;
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setsockopt(_sock,IPPROTO_IP,IP_TTL,(const char *)&hltmp,sizeof(hltmp));
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return ((int)sendto(_sock,(const char *)msg,msglen,0,to.saddr(),to.saddrLen()) == (int)msglen);
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#else
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setsockopt(_sock,IPPROTO_IP,IP_TTL,&hopLimit,sizeof(hopLimit));
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return ((int)sendto(_sock,msg,msglen,0,to.saddr(),to.saddrLen()) == (int)msglen);
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#endif
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}
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#endif
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}
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bool UdpSocket::notifyAvailableForRead(const SharedPtr<Socket> &self,SocketManager *sm)
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{
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Buffer<ZT_SOCKET_MAX_MESSAGE_LEN> buf;
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InetAddress from;
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socklen_t salen = from.saddrSpaceLen();
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int n = (int)recvfrom(_sock,(char *)(buf.data()),ZT_SOCKET_MAX_MESSAGE_LEN,0,from.saddr(),&salen);
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if (n > 0) {
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buf.setSize((unsigned int)n);
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#ifndef ZT_BREAK_UDP
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sm->handleReceivedPacket(self,from,buf);
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#endif
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}
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return true;
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}
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bool UdpSocket::notifyAvailableForWrite(const SharedPtr<Socket> &self,SocketManager *sm)
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{
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return true;
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}
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} // namespace ZeroTier
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