class DNSQuery:
def __init__(self, data):
self.data=data
self.dominio=''

tipo = (ord(data[2]) >> 3) & 15 # Opcode bits
if tipo == 0: # Standard query
ini=12
lon=ord(data[ini])
while lon != 0:
self.dominio+=data[ini+1:ini+lon+1]+'.'
ini+=lon+1
lon=ord(data[ini])

def respuesta(self, ip):
packet=''
if self.dominio:
packet+=self.data[:2] + "\x81\x80"
packet+=self.data[4:6] + self.data[4:6] + '\x00\x00\x00\x00' # Questions and Answers Counts
packet+=self.data[12:] # Original Domain Name Question
packet+='\xc0\x0c' # Pointer to domain name
packet+='\x00\x01\x00\x01\x00\x00\x00\x3c\x00\x04' # Response type, ttl and resource data length -> 4 bytes
packet+=str.join('',map(lambda x: chr(int(x)), ip.split('.'))) # 4bytes of IP
return packet

if __name__ == '__main__':
ip='192.168.1.1'
print 'pyminifakeDNS:: dom.query. 60 IN A %s' % ip

udps = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
udps.bind(('',53))

DIR=/usr/local/bin/myservice
DAEMON=$DIR/myservice.py
DAEMON_NAME=myservice

DAEMON_OPTS=""
DAEMON_USER=root

PIDFILE=/var/run/$DAEMON_NAME.pid
. /lib/lsb/init-functions

do_start () {
log_daemon_msg "Starting system $DAEMON_NAME daemon"
start-stop-daemon --start --background --pidfile $PIDFILE --make-pidfile --user $DAEMON_USER --chuid $DAEMON_USER --startas $DAEMON -- $DAEMON_OPTS
log_end_msg $?
}
do_stop () {
log_daemon_msg "Stopping system $DAEMON_NAME daemon"
start-stop-daemon --stop --pidfile $PIDFILE --retry 10
log_end_msg $?
}

case "$1" in

start|stop)
do_${1}
;;

restart|reload|force-reload)
do_stop
do_start
;;

status)
status_of_proc "$DAEMON_NAME" "$DAEMON" && exit 0 || exit $?
;;
*)
echo "Usage: /etc/init.d/$DAEMON_NAME {start|stop|restart|status}"
exit 1
;;

import threading
import time
import requests

"""
Checking http reposne every milisecond.
"""

class HttpChecking(object):

def __init__(self, interval=0.01):

self.interval = interval

thread = threading.Thread(target=self.run, args=())
thread.daemon = True
thread.start()

def check_url(self):
try:
self.url = "http://www.linuxhow.tk"
r = requests.head(self.url)
print r.status_code
except requests.ConnectionError:
print "failed to connect"

def run(self):
while True:
print('Checking HTTP status...')
self.check_url()
time.sleep(self.interval)