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

node/SocketManager.hpp

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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/
+ */
+
+#ifndef ZT_SOCKETMANAGER_HPP
+#define ZT_SOCKETMANAGER_HPP
+
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef __WINDOWS__
+#include <WinSock2.h>
+#include <WS2tcpip.h>
+#include <Windows.h>
+#else
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/select.h>
+#endif
+
+#include <map>
+#include <stdexcept>
+
+#include "Constants.hpp"
+#include "SharedPtr.hpp"
+#include "InetAddress.hpp"
+#include "Socket.hpp"
+#include "TcpSocket.hpp"
+#include "UdpSocket.hpp"
+#include "Mutex.hpp"
+#include "NonCopyable.hpp"
+#include "Buffer.hpp"
+
+namespace ZeroTier {
+
+/**
+ * Socket I/O multiplexer
+ *
+ * This wraps select(), epoll(), etc. and handles creation of Sockets.
+ */
+class SocketManager : NonCopyable
+{
+	friend class Socket;
+	friend class UdpSocket;
+	friend class TcpSocket;
+
+public:
+	/**
+	 * @param localUdpPort Local UDP port to bind or 0 for no UDP support
+	 * @param localTcpPort Local TCP port to listen to or 0 for no incoming TCP connect support
+	 * @param packetHandler Function to call when packets are received by a socket
+	 * @param arg Second argument to packetHandler()
+	 * @throws std::runtime_error Could not bind local port(s) or open socket(s)
+	 */
+	SocketManager(int localUdpPort,int localTcpPort,void (*packetHandler)(const SharedPtr<Socket> &,void *,const InetAddress &,Buffer<ZT_SOCKET_MAX_MESSAGE_LEN> &),void *arg);
+
+	~SocketManager();
+
+	/**
+	 * Send a message to a remote peer
+	 *
+	 * If 'tcp' is true an existing TCP socket will be used or an attempt will
+	 * be made to connect if one is not available. The message will be placed
+	 * in the connecting TCP socket's outgoing queue, so if the connection
+	 * succeeds the message will be sent. Otherwise it will be dropped.
+	 *
+	 * @param to Destination address
+	 * @param tcp Use TCP?
+	 * @param msg Message to send
+	 * @param msglen Length of message
+	 */
+	bool send(const InetAddress &to,bool tcp,const void *msg,unsigned int msglen);
+
+	/**
+	 * Send a UDP packet with a limited IP TTL
+	 *
+	 * @param to Destination address
+	 * @param hopLimit IP TTL
+	 */
+	bool sendFirewallOpener(const InetAddress &to,int hopLimit);
+
+	/**
+	 * Perform I/O polling operation (e.g. select())
+	 *
+	 * If called concurrently, one will block until the other completes.
+	 *
+	 * @param timeout Timeout in milliseconds, may return sooner if whack() is called
+	 */
+	void poll(unsigned long timeout);
+
+	/**
+	 * Cause current or next blocking poll() operation to timeout immediately
+	 */
+	void whack();
+
+private:
+	// Called by socket implementations when a packet is received
+	inline void handleReceivedPacket(const SharedPtr<Socket> &sock,const InetAddress &from,Buffer<ZT_SOCKET_MAX_MESSAGE_LEN> &data)
+		throw()
+	{
+		try {
+			_packetHandler(sock,_arg,from,data);
+		} catch ( ... ) {} // handlers shouldn't throw
+	}
+
+	// Called by socket implementations to register or unregister for available-for-write notification on underlying _sock
+	inline void startNotifyWrite(const Socket *sock)
+		throw()
+	{
+		_fdSetLock.lock();
+		FD_SET(sock->_sock,&_writefds);
+		_fdSetLock.unlock();
+	}
+	inline void stopNotifyWrite(const Socket *sock)
+		throw()
+	{
+		_fdSetLock.lock();
+		FD_CLR(sock->_sock,&_writefds);
+		_fdSetLock.unlock();
+	}
+
+	inline void _closeSockets()
+		throw()
+	{
+#ifdef __WINDOWS__
+		if (_whackSendPipe != INVALID_SOCKET)
+			::closesocket(_whackSendPipe);
+		if (_whackReceivePipe != INVALID_SOCKET)
+			::closesocket(_whackReceivePipe);
+		if (_tcpV4ListenSocket != INVALID_SOCKET)
+			::closesocket(s);
+		if (_tcpV6ListenSocket != INVALID_SOCKET)
+			::closesocket(s);
+#else
+		if (_whackSendPipe > 0)
+			::close(_whackSendPipe);
+		if (_whackReceivePipe > 0)
+			::close(_whackReceivePipe);
+		if (_tcpV4ListenSocket > 0)
+			::close(_tcpV4ListenSocket);
+		if (_tcpV4ListenSocket > 0)
+			::close(_tcpV6ListenSocket);
+#endif
+	}
+
+#ifdef __WINDOWS__
+	SOCKET _whackSendPipe;
+	SOCKET _whackReceivePipe;
+#else
+	int _whackSendPipe;
+	int _whackReceivePipe;
+#endif
+	Mutex::Lock _whackSendPipe_m;
+
+#ifdef __WINDOWS__
+	SOCKET _tcpV4ListenSocket;
+	SOCKET _tcpV6ListenSocket;
+#else
+	int _tcpV4ListenSocket;
+	int _tcpV6ListenSocket;
+#endif
+
+	SharedPtr<Socket> _udpV4Socket;
+	SharedPtr<Socket> _udpV6Socket;
+
+	fd_set _readfds;
+	fd_set _writefds;
+	int _nfds;
+	Mutex _fdSetLock;
+
+	std::map< InetAddress,SharedPtr<Socket> > _tcpSockets;
+	Mutex _tcpSockets_m;
+
+	void (*_packetHandler)(const SharedPtr<Socket> &,void *,const InetAddress &,Buffer<ZT_SOCKET_MAX_MESSAGE_LEN> &);
+	void *_arg;
+
+	Mutex _pollLock;
+};
+
+} // namespace ZeroTier
+
+#endif