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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. 
#ifndef SNIFFER_H
#define SNIFFER_H 1

#define _BSD_SOURCE 1
#define _REENTRANT

#include <pcap/pcap.h>
#ifdef HAVE_PCAP_H
#include <pcap.h>
#include <pthread.h>
#include "PacketBuffer.h"

class Sniffer

      // init performs some constructor-like activity. It is separate
      // so that exceptions don't have to be thrown in the constructor.
      void init(char *iface, char *fexp);

      // set the place where sniffed packets are sent for further 
      // processing. If NULL, packets are just dropped.
      void dest( PacketBuffer *pb=NULL );

      // do not call. called only from the pcap_loop loopback function. 
      void processPacket(const pcap_pkthdr *header, const u_char *packet);

      // do not call. called only from sniffer_thread_func
      void run(); 
      pthread_t sniffer_tid; // thread id of sniffer thread
      pcap_t *handle;        // device handle, for net dev we're sniffing
      PacketBuffer *pb;      // send packets here. may be NULL.
      pthread_mutex_t pb_mutex;

      // these are true if these parts were successfully initialzised, 
      // and thus would need to be cleaned up in the constructor.
      // also used to make sure init() isn't called more than once.
      bool pcap_initted;
      bool pthread_initted;

      // the data link type. set to one of the DLT_* values in 
      // net/bpf.h. Specifies what type of link layer this is 
      // (ethernet, ppp, raw IP...)
      int dlt;

// pcap_loop calls this function
void handle_packet(u_char *other, const struct pcap_pkthdr *header, const u_char *packet);

// main function for sniffer thread
void *sniffer_thread_func(void *);


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