Bunch of work in progress on new socket multiplexer and plumbing for TCP jailbreaking... Don't try to build, won't yet.

1 files changed, 410 insertions, 0 deletions

diff --git a/node/SocketManager.cpp b/node/SocketManager.cpp
new file mode 100644
index 00000000..87bbf066
--- /dev/null
+++ b/node/SocketManager.cpp
@@ -0,0 +1,410 @@
+/*
+ * 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 <sys/types.h>
+
+#include "SocketManager.hpp"
+
+#ifndef __WINDOWS__
+#include <unistd.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <signal.h>
+#endif
+
+// Allow us to use the same value on Windows and *nix
+#ifndef INVALID_SOCKET
+#define INVALID_SOCKET 0
+#endif
+
+namespace ZeroTier {
+
+#ifdef __WINDOWS__
+// hack from StackOverflow, behaves a bit like pipe() on *nix systems
+static inline void __winpipe(SOCKET fds[2])
+{
+	struct sockaddr_in inaddr;
+	struct sockaddr addr;
+	SOCKET lst=::socket(AF_INET, SOCK_STREAM,IPPROTO_TCP);
+	memset(&inaddr, 0, sizeof(inaddr));
+	memset(&addr, 0, sizeof(addr));
+	inaddr.sin_family = AF_INET;
+	inaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+	inaddr.sin_port = 0;
+	int yes=1;
+	setsockopt(lst,SOL_SOCKET,SO_REUSEADDR,(char*)&yes,sizeof(yes));
+	bind(lst,(struct sockaddr *)&inaddr,sizeof(inaddr));
+	listen(lst,1);
+	int len=sizeof(inaddr);
+	getsockname(lst, &addr,&len);
+	fds[0]=::socket(AF_INET, SOCK_STREAM,0);
+	connect(fds[0],&addr,len);
+	fds[1]=accept(lst,0,0);
+	closesocket(lst);
+}
+#endif
+
+SocketManager::SocketManager(int localUdpPort,int localTcpPort,void (*packetHandler)(const SharedPtr<Socket> &,void *,const InetAddress &,const void *,unsigned int),void *arg) :
+	_whackSendPipe(INVALID_SOCKET),
+	_whackReceivePipe(INVALID_SOCKET),
+	_tcpV4ListenSocket(INVALID_SOCKET),
+	_tcpV6ListenSocket(INVALID_SOCKET),
+	_nfds(0),
+	_packetHandler(packetHandler),
+	_arg(arg)
+{
+	FD_ZERO(&_readfds);
+	FD_ZERO(&_writefds);
+
+#ifdef __WINDOWS__
+	{
+		SOCKET tmps[2] = { INVALID_SOCKET,INVALID_SOCKET };
+		__winpipe(tmps);
+		_whackSendPipe = tmps[0];
+		_whackReceivePipe = tmps[1];
+	}
+#else
+	{
+		int tmpfds[2];
+		if (::pipe(tmpfds,0))
+			throw std::runtime_error("pipe() failed");
+		_whackSendPipe = tmpfds[1];
+		_whackReceivePipe = tmpfds[0];
+	}
+#endif
+	FD_SET(_whackReceivePipe,&_readfds);
+
+	if (localTcpPort > 0) {
+		if (localTcpPort > 0xffff) {
+			_closeSockets();
+			throw std::runtime_error("invalid local TCP port number");
+		}
+
+		{ // bind TCP IPv6
+			_tcpV6ListenSocket = ::socket(AF_INET6,SOCK_STREAM,0);
+#ifdef __WINDOWS__
+			if (_tcpV6ListenSocket == INVALID_SOCKET) {
+				_closeSockets();
+				throw std::runtime_error("unable to create IPv6 SOCK_STREAM socket");
+			}
+#else
+			if (_tcpV6ListenSocket <= 0) {
+				_closeSockets();
+				throw std::runtime_error("unable to create IPv6 SOCK_STREAM socket");
+			}
+#endif
+
+#ifdef __WINDOWS__
+			{
+				BOOL f;
+				f = TRUE; ::setsockopt(_tcpV6ListenSocket,IPPROTO_IPV6,IPV6_V6ONLY,(const char *)&f,sizeof(f));
+				f = TRUE; ::setsockopt(_tcpV6ListenSocket,SOL_SOCKET,SO_REUSEADDR,(const char *)&f,sizeof(f));
+			}
+#else
+			{
+				int f;
+				f = 1; ::setsockopt(_tcpV6ListenSocket,IPPROTO_IPV6,IPV6_V6ONLY,(void *)&f,sizeof(f));
+				f = 1; ::setsockopt(_tcpV6ListenSocket,SOL_SOCKET,SO_REUSEADDR,(void *)&f,sizeof(f));
+			}
+#endif
+
+			struct sockaddr_in6 sin6;
+			memset(&sin6,0,sizeof(sin6));
+			sin6.sin6_family = AF_INET6;
+			sin6.sin6_port = htons(localTcpPort);
+			memcpy(&(sin6.sin6_addr),&in6addr_any,sizeof(struct in6_addr));
+			if (::bind(_tcpV6ListenSocket,(const struct sockaddr *)&sin6,sizeof(sin6))) {
+				_closeSockets();
+				throw std::runtime_error("unable to bind to local TCP port");
+			}
+
+			if (::listen(_tcpV6ListenSocket,16)) {
+				_closeSockets();
+				throw std::runtime_error("listen() failed");
+			}
+
+			FD_SET(_tcpV6ListenSocket,&_readfds);
+		}
+
+		{ // bind TCP IPv4
+			_tcpV4ListenSocket = ::socket(AF_INET,SOCK_STREAM,0);
+#ifdef __WINDOWS__
+			if (_tcpV4ListenSocket == INVALID_SOCKET) {
+				_closeSockets();
+				throw std::runtime_error("unable to create IPv4 SOCK_STREAM socket");
+			}
+#else
+			if (_tcpV4ListenSocket <= 0) {
+				_closeSockets();
+				throw std::runtime_error("unable to create IPv4 SOCK_STREAM socket");
+			}
+#endif
+
+#ifdef __WINDOWS__
+			{
+				BOOL f = TRUE; ::setsockopt(_tcpV4ListenSocket,SOL_SOCKET,SO_REUSEADDR,(const char *)&f,sizeof(f));
+			}
+#else
+			{
+				int f = 1; ::setsockopt(_tcpV4ListenSocket,SOL_SOCKET,SO_REUSEADDR,(void *)&f,sizeof(f));
+			}
+#endif
+
+			struct sockaddr_in sin4;
+			memset(&sin4,0,sizeof(sin4));
+			sin4.sin_family = AF_INET;
+			sin4.sin_port = htons(localTcpPort);
+			sin4.sin_addr.s_addr = INADDR_ANY;
+			if (::bind(_tcpV4ListenSocket,(const struct sockaddr *)&sin4,sizeof(sin4))) {
+				_closeSockets();
+				throw std::runtime_error("unable to bind to local TCP port");
+			}
+
+			if (::listen(_tcpV4ListenSocket,16)) {
+				_closeSockets();
+				throw std::runtime_error("listen() failed");
+			}
+
+			FD_SET(_tcpV4ListenSocket,&_readfds);
+		}
+	}
+
+	if (localUdpPort > 0) {
+		if (localUdpPort > 0xffff) {
+			_closeSockets();
+			throw std::runtime_error("invalid local UDP port number");
+		}
+
+		{ // bind UDP IPv6
+#ifdef __WINDOWS__
+			SOCKET s = ::socket(AF_INET6,SOCK_DGRAM,0);
+			if (s == INVALID_SOCKET) {
+				_closeSockets();
+				throw std::runtime_error("unable to create IPv6 SOCK_DGRAM socket");
+			}
+#else
+			int s = ::socket(AF_INET6,SOCK_DGRAM,0);
+			if (s <= 0) {
+				_closeSockets();
+				throw std::runtime_error("unable to create IPv6 SOCK_DGRAM socket");
+			}
+#endif
+
+			{
+#ifdef __WINDOWS__
+				BOOL f;
+				f = TRUE; setsockopt(s,IPPROTO_IPV6,IPV6_V6ONLY,(const char *)&f,sizeof(f));
+				f = FALSE; setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(const char *)&f,sizeof(f));
+				f = FALSE; setsockopt(s,IPPROTO_IPV6,IPV6_DONTFRAG,(const char *)&f,sizeof(f));
+#else
+				int f;
+				f = 1; setsockopt(s,IPPROTO_IPV6,IPV6_V6ONLY,(void *)&f,sizeof(f));
+				f = 0; setsockopt(s,SOL_SOCKET,SO_REUSEADDR,(void *)&f,sizeof(f));
+#ifdef IP_DONTFRAG
+				f = 0; setsockopt(s,IPPROTO_IP,IP_DONTFRAG,&f,sizeof(f));
+#endif
+#ifdef IP_MTU_DISCOVER
+				f = 0; setsockopt(s,IPPROTO_IP,IP_MTU_DISCOVER,&f,sizeof(f));
+#endif
+#ifdef IPV6_MTU_DISCOVER
+				f = 0; setsockopt(s,IPPROTO_IPV6,IPV6_MTU_DISCOVER,&f,sizeof(f));
+#endif
+#endif
+			}
+
+			struct sockaddr_in6 sin6;
+			memset(&sin6,0,sizeof(sin6));
+			sin6.sin6_family = AF_INET6;
+			sin6.sin6_port = htons(localUdpPort);
+			memcpy(&(sin6.sin6_addr),&in6addr_any,sizeof(struct in6_addr));
+			if (::bind(s,(const struct sockaddr *)&sin6,sizeof(sin6))) {
+#ifdef __WINDOWS__
+				::closesocket(s);
+#else
+				::close(s);
+#endif
+				_closeSockets();
+				throw std::runtime_error("unable to bind to port");
+			}
+
+			FD_SET(s,&_readfds);
+			_udpV6Socket = SharedPtr<Socket>(new UdpSocket(Socket::ZT_SOCKET_TYPE_UDP_V6,s));
+		}
+
+		{ // bind UDP IPv4
+#ifdef __WINDOWS__
+			SOCKET s = ::socket(AF_INET,SOCK_DGRAM,0);
+			if (s == INVALID_SOCKET) {
+				_closeSockets();
+				throw std::runtime_error("unable to create IPv4 SOCK_DGRAM socket");
+			}
+#else
+			int s = ::socket(AF_INET,SOCK_DGRAM,0);
+			if (s <= 0) {
+				_closeSockets();
+				throw std::runtime_error("unable to create IPv4 SOCK_DGRAM socket");
+			}
+#endif
+
+			{
+#ifdef __WINDOWS__
+				BOOL f;
+				f = FALSE; setsockopt(_sock,SOL_SOCKET,SO_REUSEADDR,(const char *)&f,sizeof(f));
+				f = FALSE; setsockopt(_sock,IPPROTO_IP,IP_DONTFRAGMENT,(const char *)&f,sizeof(f));
+#else
+				int f;
+				f = 0; setsockopt(_sock,SOL_SOCKET,SO_REUSEADDR,(void *)&f,sizeof(f));
+#ifdef IP_DONTFRAG
+				f = 0; setsockopt(_sock,IPPROTO_IP,IP_DONTFRAG,&f,sizeof(f));
+#endif
+#ifdef IP_MTU_DISCOVER
+				f = 0; setsockopt(_sock,IPPROTO_IP,IP_MTU_DISCOVER,&f,sizeof(f));
+#endif
+#endif
+			}
+
+			struct sockaddr_in sin4;
+			memset(&sin4,0,sizeof(sin4));
+			sin4.sin_family = AF_INET;
+			sin4.sin_port = htons(localUdpPort);
+			sin4.sin_addr.s_addr = INADDR_ANY;
+			if (::bind(s,(const struct sockaddr *)&sin4,sizeof(sin4))) {
+#ifdef __WINDOWS__
+				::closesocket(s);
+#else
+				::close(s);
+#endif
+				throw std::runtime_error("unable to bind to port");
+			}
+
+			FD_SET(s,&_readfds);
+			_udpV4Socket = SharedPtr<Socket>(new UdpSocket(Socket::ZT_SOCKET_TYPE_UDP_V4,s));
+		}
+	}
+}
+
+SocketManager::~SocketManager()
+{
+	Mutex::Lock _l(_pollLock);
+	_closeSockets();
+}
+
+bool SocketManager::send(const InetAddress &to,bool tcp,const void *msg,unsigned int msglen)
+{
+	if (tcp) {
+	} else if (to.isV4()) {
+		if (_udpV4Socket)
+			return _udpV4Socket->send(to,msg,msglen);
+	} else if (to.isV6()) {
+		if (_udpV6Socket)
+			return _udpV6Socket->send(to,msg,msglen);
+	}
+	return false;
+}
+
+bool SocketManager::sendFirewallOpener(const InetAddress &to,int hopLimit)
+{
+	if (to.isV4()) {
+		if (_udpV4Socket)
+			return _udpV4Socket->sendWithHopLimit(to,msg,msglen,hopLimit);
+	} else if (to.isV6()) {
+		if (_udpV6Socket)
+			return _udpV6Socket->sendWithHopLimit(to,msg,msglen,hopLimit);
+	}
+	return false;
+}
+
+void SocketManager::poll(unsigned long timeout)
+{
+	fd_set rfds,wfds,nfds;
+	struct timeval tv;
+
+	Mutex::Lock _l(_pollLock);
+
+	_fdSetLock.lock();
+	memcpy(&rfds,&_readfds,sizeof(rfds));
+	memcpy(&wfds,&_writefds,sizeof(wfds));
+	_fdSetLock.unlock();
+	FD_ZERO(&nfds);
+
+	tv.tv_sec = (long)(timeout / 1000);
+	tv.tv_usec = (long)((timeout % 1000) * 1000);
+	select(_nfds,&rfds,&wfds,&nfds,(timeout > 0) ? &tv : (struct timeval *)0);
+
+	if (FD_ISSET(_whackReceivePipe,&rfds)) {
+		char tmp[32];
+#ifdef __WINDOWS__
+		::recv(_whackReceivePipe,tmp,sizeof(tmp),0);
+#else
+		::read(_whackReceivePipe,tmp,sizeof(tmp));
+#endif
+	}
+
+	if ((_tcpV4ListenSocket != INVALID_SOCKET)&&(FD_ISSET(_tcpV4ListenSocket,&rfds))) {
+	}
+	if ((_tcpV6ListenSocket != INVALID_SOCKET)&&(FD_ISSET(_tcpV6ListenSocket,&rfds))) {
+	}
+
+	if ((_udpV4Socket)&&(FD_ISSET(_udpV4Socket->_sock,&rfds)))
+		_udpV4Socket->notifyAvailableForRead(_udpV4Socket,this);
+	if ((_udpV6Socket)&&(FD_ISSET(_udpV6Socket->_sock,&rfds)))
+		_udpV6Socket->notifyAvailableForRead(_udpV6Socket,this);
+
+	std::vector< SharedPtr<Socket> > ts;
+	{
+		Mutex::Lock _l2(_tcpSockets_m);
+		if (_tcpSockets.size()) {
+			ts.reserve(_tcpSockets.size());
+			for(std::map< InetAddress,SharedPtr<Socket> >::iterator s(_tcpSockets.begin());s!=_tcpSockets.end();++s)
+				ts.push_back(s->second);
+		}
+	}
+	for(std::vector< SharedPtr<Socket> >::iterator s(ts.begin());s!=ts.end();++s) {
+		if (FD_ISSET((*s)->_sock,&rfds))
+			s->notifyAvailableForRead(*s,this);
+		if (FD_ISSET((*s)->_sock,&wfds))
+			s->notifyAvailableForWrite(*s,this);
+	}
+}
+
+void SocketManager::whack()
+{
+	_whackSendPipe_m.lock();
+#ifdef __WINDOWS__
+	::send(_whackSendPipe,(const void *)this,1,0);
+#else
+	::write(_whackSendPipe,(const void *)this,1); // data is arbitrary, just send a byte
+#endif
+	_whackSendPipe_m.unlock();
+}
+
+} // namespace ZeroTier