/*

 *  $Id: PacketReader.cpp 54 2008-01-10 00:24:52Z mbroeker $

 * $URL: http://localhost/svn/cpp/qMonitor/trunk/PacketReader.cpp $

 */

#include <PacketReader.h>

PacketReader::PacketReader (int tm)

{

    timeout = tm;

    if ((p_socket = socket (PF_PACKET, SOCK_RAW, htons (ETH_P_ALL))) == -1) {

        perror ("SocketException");

        throw std::runtime_error ("SocketException: root access required");

    }

}

PacketReader::PacketReader (std::string filename)

{

    if ((p_socket = open (filename.c_str (), O_RDONLY)) == -1) {

        throw std::runtime_error ("FileException");

    }

    timeout = -1;

}

PacketReader::~PacketReader ()

{

    close (p_socket);

}

std::string PacketReader::read ()

{

    static char s[IP_MAXPACKET + 1];

    int c;

    c =::read (p_socket, s, IP_MAXPACKET);

    s[c] = 0;

    return std::string (s, c);

}

bool PacketReader::ready ()

{

    if (p_socket)

        return true;

    return false;

}

bool PacketReader::dataAvailable ()

{

    pollfd fdin;

    int event = 1;

    fdin.fd = p_socket;

    fdin.events = POLLIN;

    fdin.revents = 0;

    if (poll (&fdin, event, timeout) > 0)

        return true;

    return false;

}