#! /usr/bin/env python

# Search for IP clients on the current network.

import sys, subprocess, socket, fcntl, struct

def ping(host) :
    """Ping a host by name or address.
       return True if it answers, False otherwise.
    """
    rv = subprocess.call(["ping", "-q", "-c", "1", "-W", "1", host],
                         stdout = subprocess.PIPE,
                         stderr = subprocess.PIPE)
    if rv == 0 :
        return True
    return False

def ip_addr(iface):
    """Get the IP address of the interface (e.g. eth0)
    """
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    info = fcntl.ioctl(s.fileno(), 
                       0x8915,  # SIOCGIFADDR
                       struct.pack('256s', iface[:15]))
    return socket.inet_ntoa(info[20:24])

if __name__ == "__main__" :
    if len(sys.argv) > 1 :
        network = sys.argv[1]
    else :
        ip = ip_addr("eth0")
        print "My IP is", ip
        network = '.'.join(ip.split('.')[0:3])

    print "My network is", network
    for h in xrange(1, 256) :  # Yes, it should adjust based on net class
        host = "%s.%d" % (network, h)
        print host, " ",
        sys.stdout.flush()
        if ping(host) :
            print "found"
        else :
            #print "No", host
            print "\r               \r",