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106 lines
3.6 KiB
106 lines
3.6 KiB
/* |
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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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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(SocketManager *sm,SOCKET s,Socket::Type t,bool c,const InetAddress &r) : |
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#else |
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TcpSocket(SocketManager *sm,int s,Socket::Type t,bool c,const InetAddress &r) : |
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#endif |
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Socket(t,s), |
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_lastActivity(Utils::now()), |
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_sm(sm), |
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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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{ |
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//printf("!!! TCP SOCKET CREATED @%.16llx to %s\r\n",(unsigned long long)this,_remote.toString().c_str()); |
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} |
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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 _inbuf[ZT_SOCKET_MAX_MESSAGE_LEN]; |
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unsigned char _outbuf[ZT_SOCKET_MAX_MESSAGE_LEN * 4]; |
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uint64_t _lastActivity; // updated whenever data is received, checked directly by SocketManager for stale TCP cleanup |
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SocketManager *_sm; |
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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 _writeLock; |
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}; |
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} // namespace ZeroTier |
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#endif
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