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New git repository for release - version 0.2.0 tagged
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Adam Ierymenko
163
node/UdpSocket.cpp
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163
node/UdpSocket.cpp
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/*
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* ZeroTier One - Global Peer to Peer Ethernet
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* Copyright (C) 2012-2013 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 <errno.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#ifdef _WIN32
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#include <Windows.h>
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#else
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#include <unistd.h>
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#include <signal.h>
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#endif
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#include "UdpSocket.hpp"
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#include "RuntimeEnvironment.hpp"
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#include "Logger.hpp"
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#include "Switch.hpp"
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namespace ZeroTier {
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UdpSocket::UdpSocket(
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int localPort,
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bool ipv6,
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void (*packetHandler)(UdpSocket *,void *,const InetAddress &,const void *,unsigned int),
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void *arg)
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throw(std::runtime_error) :
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Thread(),
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_packetHandler(packetHandler),
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_arg(arg),
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_localPort(localPort),
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_sock(0),
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_v6(ipv6)
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{
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int yes,no;
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if ((localPort <= 0)||(localPort > 0xffff))
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throw std::runtime_error("port is out of range");
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if (ipv6) {
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_sock = socket(AF_INET6,SOCK_DGRAM,0);
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if (_sock <= 0)
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throw std::runtime_error("unable to create IPv6 SOCK_DGRAM socket");
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yes = 1; setsockopt(_sock,IPPROTO_IPV6,IPV6_V6ONLY,(void *)&yes,sizeof(yes));
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no = 0; setsockopt(_sock,SOL_SOCKET,SO_REUSEADDR,(void *)&no,sizeof(no));
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#ifdef IP_DONTFRAG
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no = 0; setsockopt(_sock,IPPROTO_IP,IP_DONTFRAG,&no,sizeof(no));
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#endif
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#ifdef IP_MTU_DISCOVER
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no = 0; setsockopt(_sock,IPPROTO_IP,IP_MTU_DISCOVER,&no,sizeof(no));
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#endif
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#ifdef IPV6_MTU_DISCOVER
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no = 0; setsockopt(_sock,IPPROTO_IPV6,IPV6_MTU_DISCOVER,&no,sizeof(no));
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#endif
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struct sockaddr_in6 sin6;
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memset(&sin6,0,sizeof(sin6));
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sin6.sin6_family = AF_INET6;
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sin6.sin6_port = htons(localPort);
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memcpy(&(sin6.sin6_addr),&in6addr_any,sizeof(struct in6_addr));
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if (::bind(_sock,(const struct sockaddr *)&sin6,sizeof(sin6))) {
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::close(_sock);
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throw std::runtime_error("unable to bind to port");
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}
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} else {
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_sock = socket(AF_INET,SOCK_DGRAM,0);
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if (_sock <= 0)
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throw std::runtime_error("unable to create IPv4 SOCK_DGRAM socket");
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no = 0; setsockopt(_sock,SOL_SOCKET,SO_REUSEADDR,(void *)&no,sizeof(no));
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#ifdef IP_DONTFRAG
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no = 0; setsockopt(_sock,IPPROTO_IP,IP_DONTFRAG,&no,sizeof(no));
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#endif
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#ifdef IP_MTU_DISCOVER
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no = 0; setsockopt(_sock,IPPROTO_IP,IP_MTU_DISCOVER,&no,sizeof(no));
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#endif
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struct sockaddr_in sin;
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memset(&sin,0,sizeof(sin));
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sin.sin_family = AF_INET;
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sin.sin_port = htons(localPort);
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sin.sin_addr.s_addr = INADDR_ANY;
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if (::bind(_sock,(const struct sockaddr *)&sin,sizeof(sin))) {
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::close(_sock);
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throw std::runtime_error("unable to bind to port");
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}
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}
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start();
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}
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UdpSocket::~UdpSocket()
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{
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close(_sock);
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}
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bool UdpSocket::send(const InetAddress &to,const void *data,unsigned int len,int hopLimit)
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throw()
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{
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Mutex::Lock _l(_sendLock);
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if (to.isV6()) {
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if (!_v6)
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return false;
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setsockopt(_sock,IPPROTO_IPV6,IPV6_UNICAST_HOPS,&hopLimit,sizeof(hopLimit));
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return ((int)sendto(_sock,data,len,0,to.saddr(),to.saddrLen()) == (int)len);
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} else {
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if (_v6)
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return false;
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setsockopt(_sock,IPPROTO_IP,IP_TTL,&hopLimit,sizeof(hopLimit));
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return ((int)sendto(_sock,data,len,0,to.saddr(),to.saddrLen()) == (int)len);
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}
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}
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void UdpSocket::main()
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throw()
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{
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char buf[32768];
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InetAddress from;
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socklen_t salen;
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int n;
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for(;;) {
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salen = from.saddrSpaceLen();
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n = (int)recvfrom(_sock,buf,sizeof(buf),0,from.saddr(),&salen);
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if (n < 0) {
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if ((errno != EINTR)&&(errno != ETIMEDOUT))
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break;
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} else if (n > 0)
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_packetHandler(this,_arg,from,buf,(unsigned int)n);
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}
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}
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} // namespace ZeroTier
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