NetInterface.hh

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/**********
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version. (See <http://www.gnu.org/copyleft/lesser.html>.)
 
This library 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 Lesser General Public License for
more details.
 
You should have received a copy of the GNU Lesser General Public License
along with this library; if not, write to the Free Software Foundation, Inc.,
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**********/
// "groupsock"
// Copyright (c) 1996-2025 Live Networks, Inc.  All rights reserved.
// Network Interfaces
// C++ header
 
#ifndef _NET_INTERFACE_HH
#define _NET_INTERFACE_HH
 
#ifndef _NET_ADDRESS_HH
#include "NetAddress.hh"
#endif
 
class NetInterface {
public:
  virtual ~NetInterface();
 
  static UsageEnvironment* DefaultUsageEnvironment;
      // if non-NULL, used for each new interface
 
protected:
  NetInterface(); // virtual base class
};
 
class Socket: public NetInterface {
public:
  virtual ~Socket();
  void reset(); // closes the socket, and sets "fSocketNum" to -1
 
  virtual Boolean handleRead(unsigned char* buffer, unsigned bufferMaxSize,
                             unsigned& bytesRead,
                             struct sockaddr_storage& fromAddress) = 0;
      // Returns False on error; resultData == NULL if data ignored
 
  int socketNum() const { return fSocketNum; }
 
  Port port() const {
    return fPort;
  }
 
  UsageEnvironment& env() const { return fEnv; }
 
  static int DebugLevel;
 
protected:
  Socket(UsageEnvironment& env, Port port, int family); // virtual base class
 
  Boolean changePort(Port newPort); // will also cause socketNum() to change
 
private:
  int fSocketNum;
  UsageEnvironment& fEnv;
  Port fPort;
  int fFamily;
};
 
UsageEnvironment& operator<<(UsageEnvironment& s, const Socket& sock);
 
// A data structure for looking up a Socket by port:
 
class SocketLookupTable {
public:
  virtual ~SocketLookupTable();
 
  Socket* Fetch(UsageEnvironment& env, Port port, Boolean& isNew);
  // Creates a new Socket if none already exists
  Boolean Remove(Socket const* sock);
 
protected:
  SocketLookupTable(); // abstract base class
  virtual Socket* CreateNew(UsageEnvironment& env, Port port) = 0;
 
private:
  HashTable* fTable;
};
 
// A data structure for counting traffic:
 
class NetInterfaceTrafficStats {
public:
  NetInterfaceTrafficStats();
 
  void countPacket(unsigned packetSize);
 
  float totNumPackets() const {return fTotNumPackets;}
  float totNumBytes() const {return fTotNumBytes;}
 
  Boolean haveSeenTraffic() const;
 
private:
  float fTotNumPackets;
  float fTotNumBytes;
};
 
#endif