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dnsv4.py
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dnsv4.py
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#!/usr/bin/python
# dnsv4.py - DNSv4 query tool
# Copyright (C) 2011 Nadeem Douba
#
# 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/>.
#
# Nadeem Douba <ndouba at gmail dot com>
# 348 Patricia Ave, Ottawa, ON, K1Z 6G6
# Canada
import sys
import argparse
import libnet
from libnet.constants import *
class TYPE:
RESERVED='\x00\x00'
A='\x00\x01'
NS='\x00\x02'
MD='\x00\x03'
MF='\x00\x04'
CNAME='\x00\x05'
SOA='\x00\x06'
MB='\x00\x07'
MG='\x00\x08'
MR='\x00\x09'
NULL='\x00\x0a'
WKS='\x00\x0b'
PTR='\x00\x0c'
HINFO='\x00\x0d'
MINFO='\x00\x0e'
MX='\x00\x0f'
TXT='\x00\x10'
RP='\x00\x11'
AFSDB='\x00\x12'
X25='\x00\x13'
ISDN='\x00\x14'
RT='\x00\x15'
NSAP='\x00\x16'
NSAP_PTR='\x00\x17'
SIG='\x00\x18'
KEY='\x00\x19'
PX='\x00\x1a'
GPOS='\x00\x1b'
AAAA='\x00\x1c'
LOC='\x00\x1d'
NXT='\x00\x1e'
EID='\x00\x1f'
NIMLOC='\x00\x20'
SRV='\x00\x21'
ATMA='\x00\x22'
NAPTR='\x00\x23'
KX='\x00\x24'
CERT='\x00\x25'
A6='\x00\x26'
DNAME='\x00\x27'
SINK='\x00\x28'
OPT='\x00\x29'
APL='\x00\x2a'
DS='\x00\x2b'
SSHFP='\x00\x2c'
IPSECKEY='\x00\x2d'
RRSIG='\x00\x2e'
NSEC='\x00\x2f'
DNSKEY='\x00\x30'
DHCID='\x00\x31'
NSEC3='\x00\x32'
NSEC3PARAM='\x00\x33'
HIP='\x00\x37'
NINFO='\x00\x38'
RKEY='\x00\x39'
TALINK='\x00\x3a'
SPF='\x00\x63'
UINFO='\x00\x64'
UID='\x00\x65'
GID='\x00\x66'
UNSPEC='\x00\x67'
TKEY='\x00\xf9'
TSIG='\x00\xfa'
IXFR='\x00\xfb'
AXFR='\x00\xfc'
MAILB='\x00\xfd'
MAILA='\x00\xfe'
ALL='\x00\xff'
DNSSEC_TRUSTED_AUTHORITIES='\x80\x00'
DNSSEC_LOOKASIDE_VALIDATION='\x80\x01'
class CLASS:
RESERVED='\x00\x00'
IN='\x00\x01'
CH='\x00\x03'
HS='\x00\x04'
NONE='\xff\xfe'
ANY='\xff\xff'
def toquery(query, query_type, query_class):
q = ''
for i in query:
q += '%c%s' % (len(i), i)
q += '\x00'+query_type+query_class
return q
def build_query(name, query_type, query_class):
if query_type == TYPE.PTR:
return build_inptr_query(name, query_class)
return toquery(name.split('.'), TYPE.A, CLASS.IN)
def build_inptr_query(name, query_class):
q = ''
l = name.split('.')
l.reverse()
l.extend(['in-addr', 'arpa'])
return toquery(l, TYPE.PTR, query_class)
if __name__ == '__main__':
# Parse the arguments
parser = argparse.ArgumentParser(description='Creates and injects a UDP-based DNSV4 IN A query.')
parser.add_argument('-i', metavar='interface', required=True, help='the injection interface.')
parser.add_argument('-d', metavar='destination', required=True, help='the destination to resolve')
parser.add_argument('-n', metavar='nameserver', required=True, help='DNS server.')
parser.add_argument('-q', metavar='query_type', required=False, help='DNS query type (e.g. A, MX, NS, etc.).', default='A', choices=filter(lambda n: not(n.startswith('__')), dir(TYPE)))
parser.add_argument('-c', metavar='query_class', required=False, help='DNS query type (e.g. A, MX, NS, etc.).', default='IN', choices=filter(lambda n: not(n.startswith('__')), dir(CLASS)))
args = parser.parse_args(sys.argv[1:])
c = libnet.context(device=args.i, injection_type=RAW4)
print 'Building DNS getheader:'
dns_ptag = c.build_dnsv4(id=3,flags=256,num_q=1,num_anws_rr=0,num_auth_rr=0,num_addi_rr=0,payload=build_query(args.d, eval('TYPE.%s' % args.q), eval('CLASS.%s' % args.c)))
print c.getheader(dns_ptag)
print 'Building UDP getheader:'
udp_ptag = c.build_udp(dp=53)
print c.getheader(udp_ptag)
print 'Building IPv4 getheader:'
ipv4_ptag = c.build_ipv4(dst=c.name2addr4('4.2.2.1', DONT_RESOLVE), prot=17)
print c.getheader(ipv4_ptag)
print 'Sending packet:'
print c.getpacket()
c.write()
print 'Stats:'
print c.stats()