mirror of
https://github.com/zerotier/ZeroTierOne.git
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106 lines
3.5 KiB
C++
106 lines
3.5 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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#ifndef ZT_TCPSOCKET_HPP
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#define ZT_TCPSOCKET_HPP
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#include <stdint.h>
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#include "InetAddress.hpp"
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#include "Mutex.hpp"
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#include "Utils.hpp"
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#include "Socket.hpp"
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#define ZT_TCP_SENDQ_LENGTH 4096
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#define ZT_TCP_MAX_MESSAGE_LENGTH 2048
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namespace ZeroTier {
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class SocketManager;
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/**
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* A TCP socket encapsulating ZeroTier packets over a TCP stream connection
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*
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* This implements a simple packet encapsulation that is designed to look like
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* a TLS connection. It's not a TLS connection, but it sends TLS format record
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* headers. It could be extended in the future to implement a fake TLS
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* handshake.
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*
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* At the moment, each packet is just made to look like TLS application data:
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* <[1] TLS content type> - currently 0x17 for "application data"
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* <[1] TLS major version> - currently 0x03 for TLS 1.2
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* <[1] TLS minor version> - currently 0x03 for TLS 1.2
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* <[2] payload length> - 16-bit length of payload in bytes
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* <[...] payload> - Message payload
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*
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* The primary purpose of TCP sockets is to work over ports like HTTPS(443),
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* allowing users behind particularly fascist firewalls to at least reach
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* ZeroTier's supernodes. UDP is the preferred method of communication as
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* encapsulating L2 and L3 protocols over TCP is inherently inefficient
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* due to double-ACKs. So TCP is only used as a fallback.
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*/
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class TcpSocket : public Socket
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{
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friend class SharedPtr<Socket>;
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friend class SocketManager;
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public:
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virtual ~TcpSocket();
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virtual bool send(const InetAddress &to,const void *msg,unsigned int msglen);
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protected:
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#ifdef __WINDOWS__
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TcpSocket(SOCKET s,bool c,const InetAddress &r) :
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#else
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TcpSocket(int s,bool c,const InetAddress &r) :
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#endif
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Socket(Socket::ZT_SOCKET_TYPE_TCP,s),
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_lastReceivedData(Utils::now()),
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_inptr(0),
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_outptr(0),
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_connecting(c),
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_remote(r),
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_lock() {}
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virtual bool notifyAvailableForRead(const SharedPtr<Socket> &self,SocketManager *sm);
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virtual bool notifyAvailableForWrite(const SharedPtr<Socket> &self,SocketManager *sm);
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private:
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unsigned char _outbuf[ZT_TCP_SENDQ_LENGTH];
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unsigned char _inbuf[ZT_TCP_MAX_MESSAGE_LENGTH];
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uint64_t _lastReceivedData; // updated whenever data is received, checked directly by SocketManager for stale TCP cleanup
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unsigned int _inptr;
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unsigned int _outptr;
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bool _connecting; // manipulated directly by SocketManager, true if connect() is in progress
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InetAddress _remote;
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Mutex _lock;
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};
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} // namespace ZeroTier
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#endif
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