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#!/usr/bin/env python
# Copyright (c) 2006, Neville-Neil Consulting
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# Neither the name of Neville-Neil Consulting nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# File: $Id: dns_query.py,v 1.3 2006/09/01 07:45:56 gnn Exp $
#
# Author: George V. Neville-Neil
#
# Description: A PCS demo script that performs a simple DNS lookup.
import pcs
from pcs import *
from pcs.packets.dns import *
def main():
from optparse import OptionParser
parser = OptionParser()
parser.add_option("-a", "--address",
dest="addr", default=None,
help="Address of the domain name server.")
(options, args) = parser.parse_args()
conn = TCP4Connector(options.addr, 53)
header = dnsheader()
header.id = 1
header.rd = 1
header.qdcount = 1
query = dnsquery()
query.type = 1
query.query_class = 1
lab1 = dnslabel()
lab1.name = "www"
lab2 = dnslabel()
lab2.name = "neville-neil"
lab3 = dnslabel()
lab3.name = "com"
lab4 = dnslabel()
lab4.name = ""
packet = Chain([header, lab1, lab2, lab3, lab4, query])
header.length = 38
packet = Chain([header, lab1, lab2, lab3, lab4, query])
print packet
print packet.bytes
print len(packet.bytes)
conn.write(packet.bytes, 38)
conn.close()
main()
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