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#!/usr/bin/python
# wake up a host when people try to ssh to it.
# requires a iptables forward rule like this (ferm style):
#
# domain (ip ip6) table filter chain $ch
# daddr <ipv4addr>
# proto tcp dport 22 tcp-flags (SYN ACK FIN RST) SYN
# mod state state NEW
# mod limit limit 1/minute limit-burst 1
# NFLOG nflog-group 1371 nflog-prefix "ssh to valiant";
#
# run from cron:
# @reboot screen -d -S wol -m ./wol-valiant <aa:bb:cc:dd:ee:ff> <ipv4addr> <interface>
#
# Depends: wakeonlan python-dpkt python-nflog
# Copyright 2013-2017 Peter Palfrader
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
import dpkt, nflog, socket, subprocess, sys, time
import optparse
NFLOG_GROUP = 1371
def cb(payload):
#print payload
#print payload.__dict__
#print "payload len ", payload.get_length()
data = payload.get_data()
pkt = dpkt.ip.IP(data)
#print "proto:", pkt.p
#print "source: %s" % socket.inet_ntoa(pkt.src)
#print "dest: %s" % socket.inet_ntoa(pkt.dst)
#if pkt.p == dpkt.ip.IP_PROTO_TCP:
# print " sport: %s" % pkt.tcp.sport
# print " dport: %s" % pkt.tcp.dport
#return 1
print "[%s] python callback called because of %s!"%(time.strftime("%Y-%m-%d %H:%M:%S"), socket.inet_ntoa(pkt.src))
subprocess.call(['wakeonlan', MAC])
subprocess.call(['ip', 'neigh', 'replace', IPADDR, 'lladdr', MAC, 'nud', 'stale', 'dev', INTERFACE])
sys.stdout.flush()
parser = optparse.OptionParser()
parser.set_usage("%prog <mac addr> <ip addr> <interface>")
(options, args) = parser.parse_args()
if len(args) != 3:
parser.print_help()
sys.exit(1)
MAC = args[0]
IPADDR = args[1]
INTERFACE = args[2]
l = nflog.log()
print "setting callback"
l.set_callback(cb)
print "open"
l.fast_open(NFLOG_GROUP, socket.AF_INET)
print "trying to run"
try:
l.try_run()
except KeyboardInterrupt, e:
print "interrupted"
print "unbind"
l.unbind(socket.AF_INET)
print "close"
l.close()
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