Python scan for network IP addresses and macs

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I am trying to create a script that scans a LAN and obtains the ip address and mac address of all the machines using Python. The script below does this, however it prints the list twice? How could this be achieved, or how could the script below be changed to print the list once(as a dictionary where the ip address is the key and the mac is the value)?

from __future__ import absolute_import, division, print_function
import logging
import scapy.config
import scapy.layers.l2
import scapy.route
import socket
import math
import errno

logging.basicConfig(format='%(asctime)s %(levelname)-5s %(message)s', datefmt='%Y-%m-%d %H:%M:%S', level=logging.DEBUG)
logger = logging.getLogger(__name__)


def long2net(arg):
    if (arg <= 0 or arg >= 0xFFFFFFFF):
        raise ValueError("illegal netmask value", hex(arg))
    return 32 - int(round(math.log(0xFFFFFFFF - arg, 2)))


def to_CIDR_notation(bytes_network, bytes_netmask):
    network = scapy.utils.ltoa(bytes_network)
    netmask = long2net(bytes_netmask)
    net = "%s/%s" % (network, netmask)
    if netmask < 16:
        logger.warn("%s is too big. skipping" % net)
        return None

    return net


def scan_and_print_neighbors(net, interface, timeout=1):
    logger.info("arping %s on %s" % (net, interface))
    try:
        ans, unans = scapy.layers.l2.arping(net, iface=interface, timeout=timeout, verbose=True)
        for s, r in ans.res:
            line = r.sprintf("%Ether.src%  %ARP.psrc%")
            try:
                hostname = socket.gethostbyaddr(r.psrc)
                line += " " + hostname[0]
            except socket.herror:
                # failed to resolve
                pass
            logger.info(line)
    except socket.error as e:
        if e.errno == errno.EPERM:     # Operation not permitted
            logger.error("%s. Did you run as root?", e.strerror)
        else:
            raise


if __name__ == "__main__":
    for network, netmask, _, interface, address in scapy.config.conf.route.routes:

        # skip loopback network and default gw
        if network == 0 or interface == 'lo' or address == '127.0.0.1' or address == '0.0.0.0':
            continue

        if netmask <= 0 or netmask == 0xFFFFFFFF:
            continue

        net = to_CIDR_notation(network, netmask)

        if interface != scapy.config.conf.iface:
            # see http://ift.tt/1HtLdBa
            logger.warn("skipping %s because scapy currently doesn't support arping on non-primary network interfaces", net)
            continue

        if net:
            scan_and_print_neighbors(net, interface) 

asked 1 min ago

agilebit
1

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Python scan for network IP addresses and macs