LLMNR listener round 2

llmnr-improved.py

import socket
import struct
import datetime

ALL = "0.0.0.0"
LLMNR_ADDR = "224.0.0.252"
LLMNR_PORT = 5355

# Setup network stuff
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind((ALL, LLMNR_PORT))
sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_TTL, 255)
# Join multicast group
sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP,
                socket.inet_aton(LLMNR_ADDR) + socket.inet_aton(ALL))
while True:
    try:
        data, addr = sock.recvfrom(1024)
        nameLen = int(data[12])
        # Define the packet structure
        LLMNR_HEADER = "!HHHHHHb" + str(nameLen) + "sbHH"
        # Unpack data and assign to variables, the _ throws away unused stuff
        reqID, flags, questions, _, _, _, _, hostname, _, queryType, queryClass \
                = struct.unpack(LLMNR_HEADER, data)
        print("[%s] request id 0x%04x for %s from %s" %
              (datetime.datetime.now(), reqID, hostname.decode('utf-8'), addr[0]))
    except:
        raise