PracticalSocket.h

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/*
 *  anytun
 *
 *  The secure anycast tunneling protocol (satp) defines a protocol used
 *  for communication between any combination of unicast and anycast
 *  tunnel endpoints.  It has less protocol overhead than IPSec in Tunnel
 *  mode and allows tunneling of every ETHER TYPE protocol (e.g.
 *  ethernet, ip, arp ...). satp directly includes cryptography and
 *  message authentication based on the methodes used by SRTP.  It is
 *  intended to deliver a generic, scaleable and secure solution for
 *  tunneling and relaying of packets of any protocol.
 *
 *
 *  Copyright (C) 2007 anytun.org <satp@wirdorange.org>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2
 *  as published by the Free Software Foundation.
 *
 *  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 (see the file COPYING included with this
 *  distribution); if not, write to the Free Software Foundation, Inc.,
 *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

// this is from: http://cs.ecs.baylor.edu/~donahoo/practical/CSockets/practical/
// and this is their header:
/*
 *   C++ sockets on Unix and Windows
 *   Copyright (C) 2002
 *
 *   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 2 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, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef __PRACTICALSOCKET_INCLUDED__
#define __PRACTICALSOCKET_INCLUDED__

#include <string>            // For string
#include <exception>         // For exception class

using namespace std;

class SocketException : public exception {
public:
  SocketException(const string &message, bool inclSysMsg = false) throw();

  ~SocketException() throw();

  const char *what() const throw();

private:
  string userMessage;  // Exception message
};

class Socket {
public:
  ~Socket();

  string getLocalAddress() throw(SocketException);

  unsigned short getLocalPort() throw(SocketException);

  void setLocalPort(unsigned short localPort) throw(SocketException);

  void setLocalAddressAndPort(const string &localAddress, 
    unsigned short localPort = 0) throw(SocketException);

  static void cleanUp() throw(SocketException);

  static unsigned short resolveService(const string &service,
                                       const string &protocol = "tcp");

private:
  // Prevent the user from trying to use value semantics on this object
  Socket(const Socket &sock);
  void operator=(const Socket &sock);

protected:
  int sockDesc;              // Socket descriptor
  Socket(int type, int protocol) throw(SocketException);
  Socket(int sockDesc);
};

class CommunicatingSocket : public Socket {
public:
  void connect(const string &foreignAddress, unsigned short foreignPort)
    throw(SocketException);

  void send(const void *buffer, int bufferLen) throw(SocketException);

  int recv(void *buffer, int bufferLen) throw(SocketException);

  string getForeignAddress() throw(SocketException);

  unsigned short getForeignPort() throw(SocketException);

protected:
  CommunicatingSocket(int type, int protocol) throw(SocketException);
  CommunicatingSocket(int newConnSD);
};

class TCPSocket : public CommunicatingSocket {
public:
  TCPSocket() throw(SocketException);

  TCPSocket(const string &foreignAddress, unsigned short foreignPort) 
      throw(SocketException);

private:
  // Access for TCPServerSocket::accept() connection creation
  friend class TCPServerSocket;
  TCPSocket(int newConnSD);
};

class TCPServerSocket : public Socket {
public:
  TCPServerSocket(unsigned short localPort, int queueLen = 5) 
      throw(SocketException);

  TCPServerSocket(const string &localAddress, unsigned short localPort,
      int queueLen = 5) throw(SocketException);

  TCPSocket *accept() throw(SocketException);

private:
  void setListen(int queueLen) throw(SocketException);
};

class UDPSocket : public CommunicatingSocket {
public:
  UDPSocket() throw(SocketException);

  UDPSocket(unsigned short localPort) throw(SocketException);

  UDPSocket(const string &localAddress, unsigned short localPort) 
      throw(SocketException);

  void disconnect() throw(SocketException);

  void sendTo(const void *buffer, int bufferLen, const string &foreignAddress,
            unsigned short foreignPort) throw(SocketException);

  int recvFrom(void *buffer, int bufferLen, string &sourceAddress, 
               unsigned short &sourcePort) throw(SocketException);

  void setMulticastTTL(unsigned char multicastTTL) throw(SocketException);

  void joinGroup(const string &multicastGroup) throw(SocketException);

  void leaveGroup(const string &multicastGroup) throw(SocketException);

private:
  void setBroadcast();
};

#endif

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