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 *  Ths code in this file is part of tcptrack. For more information see
 *    http://www.rhythm.cx/~steve/devel/tcptrack
 *     Copyright (C) Steve Benson - 2003
 *  tcptrack 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, or (at your
 *  option) any later version.
 *  tcptrack is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  General Public License for more details.
 *  You should have received a copy of the GNU General Public License
 *  along with GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 

#include <stdio.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <list>
#include "util.h"
#include "IPv4Packet.h"
#include "TCPPacket.h"
#include "IPv4TCPCapture.h"
#include "SocketPair4.h"

#define TCP_STATE_SYN_SYNACK    1 // initial SYN sent, waiting for SYN ACK
#define TCP_STATE_SYNACK_ACK 2 // SYN&ACK response sent, waiting for ACK
#define TCP_STATE_UP    3 // SYNACK response sent

using namespace std;

class TCPConnection
      // constructor, which needs the initial packet that created this
      // connection, or any packet that is going from client->server.
      // See comments in Guesser.cc for an explanation...
      TCPConnection( IPv4TCPCapture &p );

      // returns true if the given addresses/ports are relevant to this
      // connection.
      bool match(IPv4Address &sa, IPv4Address &da, portnum_t sp, portnum_t dp);

      // see if packet p is relevant to this connection. 
      // if it is, true will be returned and this object's internal 
      // state will be changed to relect the new packet.
      //bool acceptPacket( IPv4Packet *p );
      bool acceptPacket( IPv4TCPCapture &p );

      // get the addresses/ports which are the endpoints for this
      // connection.
      IPv4Address & srcAddr();
      portnum_t srcPort();
      IPv4Address & dstAddr();
      portnum_t dstPort();

      // returns one of the TCP_STATE_* values reflecting the connection's
      // state.
      int getState();
      // returns true if this connection is closed and no more traffic
      // is expected for it.
      bool isFinished();

      // timestamp of last packet sent either way
      time_t getLastPktTimestamp();
      // number of seconds since last packet sent either way
      time_t getIdleSeconds(); 
      // called to recalculate averages and perform any other internal 
      // updates to counters and stuff.
      // should be called at least once a second.
      // if fastMode is enabled, calling it more freqently will keep 
      // counters closer to real time.
      // if fastMode is not enabled, there's no point in calling it more
      // than once a second, but it won't hurt.
      void recalcAvg();
      // this implements an "activity light" that works just like the
      // activity LEDs on a modem.  returns true if a packet was sent
      // since the last time it was called.
      bool activityToggle();

      // number of packets sent either way in total for this connection
      int getPacketCount();

      // average number of packets per second this connection is doing
      int getPacketsPerSecond();

      // average number of packets per second this connection is doing
      // this counts only the packet's actual tcp payload, no headers
      unsigned int getPayloadBytesPerSecond();

      // average number of bytes per second this connection is doing
      // this counts the tcp and ip headers (but not link layer header)
      int getAllBytesPerSecond();

      // returns a key that fairly uniquely identifies this connection
      // used for hashing purposes
      //int getKey();

      // a SocketPair4 is two IPv4Addresses and two TCP port numbers.
      // The pair of each represents this connections src/dst addrs & ports.
      SocketPair4 & getEndpoints();
      bool fastMode();
      void purgeAvgStack();
      void fastRecalcAvg();
      void slowRecalcAvg();
      void updateCountersForPacket( IPv4TCPCapture &p );

      unsigned long finack_from_dst;
      unsigned long finack_from_src;
      bool recvd_finack_from_src;
      bool recvd_finack_from_dst;

      SocketPair4 *endpts;

      portnum_t srcport; // client port
      portnum_t dstport; // server port
      IPv4Address *srcaddr; // client addr
      IPv4Address *dstaddr; // server addr

      int state;

      time_t last_pkt_ts;
      int packet_count;

      bool activity_toggle;

      list<struct avgstat> avgstack;      
      unsigned int fm_bps; // bytes per second
      unsigned int fm_pps; // packets per second

      // per-second stats
      time_t this_second;
      unsigned int packets_this_second;
      unsigned int payload_bytes_this_second; // payload only
      unsigned int all_bytes_this_second; // ip hdr + tcp hdr + payload
      unsigned int packets_last_second;
      unsigned int payload_bytes_last_second; // payload only
      unsigned int all_bytes_last_second; // ip hdr + tcp hdr + payload



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