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#!/usr/bin/env python
#coding=utf8
#
# A python implementation of send_arp.c.
#
# ARP code and license inspired by arprequest by Antoine Millet
# See http://pypi.python.org/pypi/arprequest
#
# DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
# Version 2, December 2004
#
# Copyright (C) 2011 Kristoffer Gronlund
# Everyone is permitted to copy and distribute verbatim or modified
# copies of this license document, and changing it is allowed as long
# as the name is changed.
#
# DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
# TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
#
# 0. You just DO WHAT THE FUCK YOU WANT TO.
#
from optparse import OptionParser
import time
import socket
import itertools
import os
import signal
import atexit
import sys
from struct import pack
def commandline():
parser = OptionParser(
usage="%prog [OPTIONS] device src_ip_addr src_hw_addr broadcast_ip_addr netmask")
parser.add_option("-i", "--interval", dest="interval", default="1000",
help="Repeat interval in ms", metavar="INTERVAL")
parser.add_option("-r", "--repeat", dest="repeat", default="1",
help="Repeat count, 0 or less leads to infinite repeat",
metavar="REPEAT")
parser.add_option("-p", "--pidfile", dest="pidfile",
default="/tmp/arp.pid",
help="PID file", metavar="PID")
(options, args) = parser.parse_args()
if len(args) != 5:
parser.error("Expects: [-i repeatinterval-ms] [-r repeatcount] [-p pidfile] \\\n" +
" device src_ip_addr src_hw_addr broadcast_ip_addr netmask")
class Args(object):
pass
ret = Args()
ret.interval = int(options.interval)
ret.repeat = int(options.repeat)
ret.pidfile = options.pidfile
ret.device = args[0]
ret.src_ip_addr = args[1]
ret.src_hw_addr = args[2]
ret.broadcast_ip_addr = args[3]
ret.netmask = args[4]
return ret
def mssleep(ms):
time.sleep(ms/1000.0)
bcast_mac = pack('!6B', *(0xFF,)*6)
zero_mac = pack('!6B', *(0x00,)*6)
ARPOP_REQUEST = pack('!H', 0x0001)
ARPOP_REPLY = pack('!H', 0x0002)
# Ethernet protocol type (=ARP)
ETHERNET_PROTOCOL_TYPE_ARP = pack('!H', 0x0806)
# ARP logical protocol type (Ethernet/IP)
ARP_PROTOCOL_TYPE_ETHERNET_IP = pack('!HHBB', 0x0001, 0x0800, 0x0006, 0x0004)
def send_arp(ip, device, sender_mac, broadcast, netmask, arptype,
request_target_mac=zero_mac):
#if_ipaddr = socket.gethostbyname(socket.gethostname())
sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW, socket.SOCK_RAW)
sock.bind((device, socket.SOCK_RAW))
socket_mac = sock.getsockname()[4]
if sender_mac == 'auto':
sender_mac = socket_mac
# else:
# raise Exception("Can't ARP this: " + sender_mac)
arpop = None
target_mac = None
if arptype == 'REQUEST':
target_mac = request_target_mac
arpop = ARPOP_REQUEST
else:
target_mac = sender_mac
arpop = ARPOP_REPLY
sender_ip = pack('!4B', *[int(x) for x in ip.split('.')])
target_ip = pack('!4B', *[int(x) for x in ip.split('.')])
arpframe = [
# ## ETHERNET
# destination MAC addr
bcast_mac,
# source MAC addr
socket_mac,
ETHERNET_PROTOCOL_TYPE_ARP,
# ## ARP
ARP_PROTOCOL_TYPE_ETHERNET_IP,
# operation type
arpop,
# sender MAC addr
sender_mac,
# sender IP addr
sender_ip,
# target hardware addr
target_mac,
# target IP addr
target_ip
]
# send the ARP
sock.send(''.join(arpframe))
def write_pid_file(file_path):
# http://stackoverflow.com/a/10979569/83741
handle = os.open(file_path, os.O_CREAT | os.O_EXCL | os.O_WRONLY)
with os.fdopen(handle, 'w') as f:
f.write(str(os.getpid()))
def remove_pid_file(file_path):
os.unlink(file_path)
def setup_pid_file(file_path):
write_pid_file(file_path)
def signal_handler(signum=None, frame=None):
remove_pid_file(file_path)
sys.exit(0)
# http://stackoverflow.com/a/11858588/83741
# Only a limited set of signals are available on Windows (see #2)
# Also see https://docs.python.org/2/library/signal.html#signal.signal
import platform
if platform.system() == 'Windows':
signal_list = [signal.SIGTERM]
else:
signal_list = [signal.SIGTERM, signal.SIGINT, signal.SIGHUP, signal.SIGQUIT]
for sig in signal_list:
signal.signal(sig, signal_handler)
atexit.register(lambda: remove_pid_file(file_path))
def main():
args = commandline()
setup_pid_file(args.pidfile)
span = range(args.repeat) if args.repeat > 0 else itertools.count()
for j in span:
# Send the same packets as outlined here:
# http://support.citrix.com/article/ctx109980
send_arp(args.src_ip_addr, args.device,
args.src_hw_addr,
args.broadcast_ip_addr,
args.netmask, 'REQUEST',
request_target_mac=bcast_mac)
send_arp(args.src_ip_addr, args.device,
args.src_hw_addr,
args.broadcast_ip_addr,
args.netmask, 'REQUEST',
request_target_mac=zero_mac)
send_arp(args.src_ip_addr, args.device,
args.src_hw_addr,
args.broadcast_ip_addr,
args.netmask, 'REPLY')
if j != args.repeat - 1:
mssleep(args.interval)
if __name__ == "__main__":
main()
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