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dnstap_reader.py
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dnstap_reader.py
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#!/usr/bin/env python3
#
# dnstap_reader
# written by Luca Memini (LDO-CERT) - Luca.Memini@leonardocompany.com
# thx to Davide Arcuri
#
from __future__ import print_function
from dnstap_pb2 import *
from pprint import pprint
from var_dump import var_dump
from daemonize import Daemonize
from sys import getsizeof
import getopt, sys, datetime
import os, socket, io
import framestream
import ipaddress
import dns.message
import syslog
def log_message(tosyslog,message):
if tosyslog:
syslog.syslog(message)
else:
print(message)
def usage():
print("Usage:", sys.argv[0], "[-d][-v][-l] -f dnstap_file | -s socket_file")
print("")
print("Options:")
print(" -d\tDebug mode")
print(" -v\tVerbose mode")
print(" -l\tSend output to syslog (demonize) ** Only with socket")
print("Default mode show only Client Query e Client Response, use -v for show all dns query")
print("")
print("Quiet text output format mnemonics")
print("")
print("Query Direction:")
print(" AQ: AUTH_QUERY (type: 1)")
print(" AR: AUTH_RESPONSE (type: 2)")
print(" RQ: RESOLVER_QUERY (type: 3)")
print(" RR: RESOLVER_RESPONSE (type: 4)")
print(" CQ: CLIENT_QUERY (type 5)")
print(" CR: CLIENT_RESPONSE (type: 6)")
print(" FQ: FORWARDER_QUERY (type: 7)")
print(" FR: FORWARDER_RESPONSE (type: 8)")
print(" SQ: STUB_QUERY (type: 9)")
print(" SR: STUB_RESPONSE (type: 10)")
print(" TQ: TOOL_QUERY (type: 11)")
print(" TR: TOOL_RESPONSE (type: 12)")
print("")
print("Flags description:")
print(' QR: Query Response')
print(' AA: Authoritative Answer')
print(' TT: Truncated Response')
print(' RD: Recursion Desired')
print(' RA: Recursion Avaible')
print(' AD: Authentic Data')
print(' CD: Checking Disabled')
print("")
print("RCODE description:")
print(' NOERROR = 0')
print(' FORMERR = 1')
print(' SERVFAIL = 2')
print(' NXDOMAIN = 3')
print(' NOTIMP = 4')
print(' REFUSED = 5')
print(' YXDOMAIN = 6')
print(' YXRRSET = 7')
print(' NXRRSET = 8')
print(' NOTAUTH = 9')
print(' NOTZONE = 10')
print(' BADVERS = 16')
def print_dnsflag_fromhex(n):
if n & int('0x8000',16):
print('QR (Query Response)')
if n & int('0x0400',16):
print('AA (Authoritative Answer)')
if n & int('0x0200',16):
print('TT (Truncated Response)')
if n & int('0x0100',16):
print('RD (Recursion Desired)')
if n & int('0x0080',16):
print('RA (Recursion Avaible)')
if n & int('0x0020',16):
print('AD (Authentic Data)')
if n & int('0x0010',16):
print('CD (Checking Disabled)')
def get_query_direction(type):
switcher={
1:'AQ',
2:'AR',
3:'RQ',
4:'RR',
5:'CQ',
6:'CR',
7:'FQ',
8:'FR',
9:'SQ',
10:'SR',
11:'TQ',
12:'TR'
}
return switcher.get(type,"unknown")
def parse_frame(frame):
dnstap_data = Dnstap()
dnstap_data.ParseFromString(frame)
# https://github.com/dnstap/dnstap.pb/blob/master/dnstap.proto read here !
# print(dnstap_data)
## CLIENT_QUERY
if dnstap_data.message.type == 5:
query = dns.message.from_wire(dnstap_data.message.query_message)
for question in query.question:
msg = str(datetime.datetime.fromtimestamp(dnstap_data.message.query_time_sec).strftime('%Y-%m-%d %H:%M:%S'))
#msg += str(' DNS')
msg += ' '+str(get_query_direction(dnstap_data.message.type))+str(" ")
msg += str(ipaddress.ip_address(dnstap_data.message.query_address))+str(':')+str(dnstap_data.message.query_port)
msg += str(' -> ')
msg += str(ipaddress.ip_address(dnstap_data.message.response_address))+str(':')+str(dnstap_data.message.response_port)
msg += str(' Id: #')+str(query.id)
#msg += str(' Rcode: ')
#msg += str(dns.rcode.to_text(dns.rcode.from_flags(query.flags,query.ednsflags)))
#msg += str(' ')+str(dns.rcode.from_flags(query.flags,query.ednsflags))
msg += str(' Flags: ')
msg += str(dns.flags.to_text(query.flags))
msg += ' Question: '+question.to_text()
log_message(tosyslog,msg)
if debug:
print(print_dnsflag_fromhex(query.flags))
print(query)
## RESOLVER_QUERY
elif dnstap_data.message.type == 3:
if verbose:
query = dns.message.from_wire(dnstap_data.message.query_message)
for question in query.question:
msg = str(datetime.datetime.fromtimestamp(dnstap_data.message.query_time_sec).strftime('%Y-%m-%d %H:%M:%S'))
#msg += str(' DNS')
msg += ' '+str(get_query_direction(dnstap_data.message.type))+str(" ")
msg += str(ipaddress.ip_address(dnstap_data.message.query_address))+str(':')+str(dnstap_data.message.query_port)
msg += str(' -> ')
msg += str(ipaddress.ip_address(dnstap_data.message.response_address))+str(':')+str(dnstap_data.message.response_port)
msg += str(' Id: #')+str(query.id)
#msg += str(' Rcode: ')
#msg += str(dns.rcode.to_text(dns.rcode.from_flags(query.flags,query.ednsflags)))
#msg += str(' ')+str(dns.rcode.from_flags(query.flags,query.ednsflags))
msg += str(' Flags: ')
msg += str(dns.flags.to_text(query.flags))
msg += ' Question: '+question.to_text()
log_message(tosyslog,msg)
#print(dnstap_data)
## RESOLVER_RESPONSE
elif dnstap_data.message.type == 4:
if verbose:
query = dns.message.from_wire(dnstap_data.message.response_message)
msg = str(datetime.datetime.fromtimestamp(dnstap_data.message.query_time_sec).strftime('%Y-%m-%d %H:%M:%S'))
#msg += str(' DNS')
msg += ' '+str(get_query_direction(dnstap_data.message.type))+str(" ")
msg += str(ipaddress.ip_address(dnstap_data.message.query_address))+str(':')+str(dnstap_data.message.query_port)
msg += str(' -> ')
msg += str(ipaddress.ip_address(dnstap_data.message.response_address))+str(':')+str(dnstap_data.message.response_port)
msg += str(' Id: #')+str(query.id)
msg += str(' Rcode: ')
msg += str(dns.rcode.to_text(dns.rcode.from_flags(query.flags,query.ednsflags)))
#msg += str(' ')+str(dns.rcode.from_flags(query.flags,query.ednsflags))
msg += str(' Flags: ')
msg += str(dns.flags.to_text(query.flags))
msg += " LEN response_message: "+str(len(dnstap_data.message.response_message))
for answer in query.answer:
msg += " | "+str(answer).replace('\n',' | ')
for auth in query.authority:
msg += ' Authority: '+str(auth).replace('\n',' | ')
log_message(tosyslog,msg)
# print(dnstap_data)
## CLIENT_RESPONSE
elif dnstap_data.message.type == 6:
query = dns.message.from_wire(dnstap_data.message.response_message)
# for question in query.question:
# msg = str(datetime.datetime.fromtimestamp(dnstap_data.message.response_time_sec).strftime('%Y-%m-%d %H:%M:%S'))
# #msg += str(' DNS')
# msg += ' '+str(get_query_direction(dnstap_data.message.type))+str(" ")
# msg += str(ipaddress.ip_address(dnstap_data.message.query_address))+str(':')+str(dnstap_data.message.query_port)
# msg += str(' -> ')
# msg += str(ipaddress.ip_address(dnstap_data.message.response_address))+str(':')+str(dnstap_data.message.response_port)
# msg += str(' Id: #')+str(query.id)
# msg += str(' Flags: ')
# msg += str(dns.flags.to_text(query.flags))
# msg += ' Question: '+question.to_text()
# log_message(tosyslog,msg)
msg = str(datetime.datetime.fromtimestamp(dnstap_data.message.response_time_sec).strftime('%Y-%m-%d %H:%M:%S'))
#msg += str(' DNS')
msg += ' '+str(get_query_direction(dnstap_data.message.type))+str(" ")
msg += str(ipaddress.ip_address(dnstap_data.message.query_address))+str(':')+str(dnstap_data.message.query_port)
msg += str(' -> ')
msg += str(ipaddress.ip_address(dnstap_data.message.response_address))+str(':')+str(dnstap_data.message.response_port)
msg += str(' Id: #')+str(query.id)
msg += str(' Rcode: ')
msg += str(dns.rcode.to_text(dns.rcode.from_flags(query.flags,query.ednsflags)))
#msg += str(' ')+str(dns.rcode.from_flags(query.flags,query.ednsflags))
msg += str(' Flags: ')
msg += str(dns.flags.to_text(query.flags))
msg += " LEN response_message: "+str(len(dnstap_data.message.response_message))
for answer in query.answer:
msg += " "+str(answer).replace('\n',' | ')
if verbose:
for auth in query.authority:
msg += ' Authority: '+str(auth).replace('\n',' | ')
log_message(tosyslog,msg)
if debug:
print(print_dnsflag_fromhex(query.flags))
# print(query)
# var_dump(query)
## OTHER QUERY
else:
if verbose:
query = dns.message.from_wire(dnstap_data.message.query_message)
msg = str(datetime.datetime.fromtimestamp(dnstap_data.message.query_time_sec).strftime('%Y-%m-%d %H:%M:%S'))
#msg += str(' DNS')
msg += ' '+str(get_query_direction(dnstap_data.message.type))+str(" ")
msg += str(ipaddress.ip_address(dnstap_data.message.query_address))+str(':')+str(dnstap_data.message.query_port)
msg += str(' -> ')
msg += str(ipaddress.ip_address(dnstap_data.message.response_address))+str(':')+str(dnstap_data.message.response_port)
msg += str(' Id: #')+str(query.id)
log_message(tosyslog,msg)
#print(dnstap_data)
if debug:
query = dns.message.from_wire(dnstap_data.message.query_message)
#print(dnstap_data)
log_message(tosyslog,query)
def main():
if socketfile:
if tosyslog:
# Priority: LOG_EMERG, LOG_ALERT, LOG_CRIT, LOG_ERR, LOG_WARNING, LOG_NOTICE, LOG_INFO, LOG_DEBUG.
# Facilities: LOG_KERN, LOG_USER, LOG_MAIL, LOG_DAEMON, LOG_AUTH, LOG_LPR, LOG_NEWS, LOG_UUCP, LOG_CRON, LOG_SYSLOG and LOG_LOCAL0 to LOG_LOCAL7.
# Options: LOG_PID, LOG_CONS, LOG_NDELAY, LOG_NOWAIT and LOG_PERROR
syslog.openlog('DNStap', logoption=syslog.LOG_PID, facility=syslog.LOG_DAEMON)
log_message(tosyslog,"Starting DNStap reader")
try:
sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
sock.bind(socketfile)
os.chmod(socketfile,666)
sock.listen(1)
while True:
connection, client_address = sock.accept()
log_message(tosyslog,"New incoming connection...")
try:
# Ok, I need Frame Streams handshake code here.
# https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=741#c15
log_message(tosyslog,">> Waiting READY FRAME")
data = connection.recv(262144)
if debug:
var_dump(data)
log_message(tosyslog,"<< Sending ACCEPT FRAME")
connection.sendall(b'\x00\x00\x00\x00\x00\x00\x00\x22\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x16\x70\x72\x6f\x74\x6f\x62\x75\x66\x3a\x64\x6e\x73\x74\x61\x70\x2e\x44\x6e\x73\x74\x61\x70')
if debug:
print(b'\x00\x00\x00\x00\x00\x00\x00\x22\x00\x00\x00\x01\x00\x00\x00\x01\x00\x00\x00\x16\x70\x72\x6f\x74\x6f\x62\x75\x66\x3a\x64\x6e\x73\x74\x61\x70\x2e\x44\x6e\x73\x74\x61\x70')
log_message(tosyslog,">> Waiting START FRAME")
data = connection.recv(262144)
start = data
if debug:
var_dump(data)
while True:
data = connection.recv(262144)
if data:
b = io.BytesIO(start+data)
if debug:
var_dump(b.read())
for frame in framestream.reader(b):
parse_frame(frame)
else:
log_message(tosyslog,'antani!!!')
# connection.close()
# break
finally:
# Clean up the connection
log_message(tosyslog,"connection lost")
connection.close()
finally:
log_message(tosyslog,"Closing socket")
sock.close()
os.unlink(socketfile)
if tosyslog:
syslog.closelog()
elif tapfile:
for frame in framestream.reader(open(tapfile, "rb")):
parse_frame(frame)
else:
usage()
##############################
tapfile = False
debug = False
verbose = False
socketfile = False
tosyslog = False
try:
opts, args = getopt.getopt(sys.argv[1:], "hdvlf:s:", ["help","debug","verbose","to-syslog","file=","socket="])
for o, a in opts:
if o == "-d":
debug = True
print(":::: Debug output enabled")
elif o == "-v":
verbose = True
print(":::: Verbose output enabled")
elif o in ("-h", "--help"):
usage()
sys.exit()
elif o in ("-l", "--to-syslog"):
tosyslog = True
elif o in ("-f", "--file"):
tapfile = a
if not(tapfile):
usage()
elif o in ("-s", "--socket"):
socketfile = a
if not(socketfile):
usage()
else:
assert False, "unhandled option"
except getopt.GetoptError as err:
print(err)
print("")
usage()
sys.exit()
if tosyslog:
# ok, going in to darkness
# https://daemonize.readthedocs.io/en/latest/
pid = "/var/run/dnstap.pid"
daemon = Daemonize(app="dnstap", pid=pid, action=main,auto_close_fds=True)
daemon.start()
else:
main()