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