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# coding=utf-8 | |
""" | |
LICENSE http://www.apache.org/licenses/LICENSE-2.0 | |
""" | |
import datetime | |
import sys | |
import time | |
import threading | |
import traceback | |
import SocketServer | |
from dnslib import * | |
class DomainName(str): | |
def __getattr__(self, item): | |
return DomainName(item + '.' + self) | |
D = DomainName('example.com') | |
IP = '127.0.0.1' | |
TTL = 60 * 5 | |
PORT = 5053 | |
soa_record = SOA( | |
mname=D.ns1, # primary name server | |
rname=D.andrei, # email of the domain administrator | |
times=( | |
201307231, # serial number | |
60 * 60 * 1, # refresh | |
60 * 60 * 3, # retry | |
60 * 60 * 24, # expire | |
60 * 60 * 1, # minimum | |
) | |
) | |
ns_records = [NS(D.ns1), NS(D.ns2)] | |
records = { | |
D: [A(IP), AAAA((0,) * 16), MX(D.mail), soa_record] + ns_records, | |
D.ns1: [A(IP)], # MX and NS records must never point to a CNAME alias (RFC 2181 section 10.3) | |
D.ns2: [A(IP)], | |
D.mail: [A(IP)], | |
D.andrei: [CNAME(D)], | |
} | |
def dns_response(data): | |
request = DNSRecord.parse(data) | |
print request | |
reply = DNSRecord(DNSHeader(id=request.header.id, qr=1, aa=1, ra=1), q=request.q) | |
qname = request.q.qname | |
qn = str(qname) | |
qtype = request.q.qtype | |
qt = QTYPE[qtype] | |
if qn == D or qn.endswith('.' + D): | |
for name, rrs in records.iteritems(): | |
if name == qn: | |
for rdata in rrs: | |
rqt = rdata.__class__.__name__ | |
if qt in ['*', rqt]: | |
reply.add_answer(RR(rname=qname, rtype=QTYPE[rqt], rclass=1, ttl=TTL, rdata=rdata)) | |
for rdata in ns_records: | |
reply.add_ns(RR(rname=D, rtype=QTYPE.NS, rclass=1, ttl=TTL, rdata=rdata)) | |
reply.add_ns(RR(rname=D, rtype=QTYPE.SOA, rclass=1, ttl=TTL, rdata=soa_record)) | |
print "---- Reply:\n", reply | |
return reply.pack() | |
class BaseRequestHandler(SocketServer.BaseRequestHandler): | |
def get_data(self): | |
raise NotImplementedError | |
def send_data(self, data): | |
raise NotImplementedError | |
def handle(self): | |
now = datetime.datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S.%f') | |
print "\n\n%s request %s (%s %s):" % (self.__class__.__name__[:3], now, self.client_address[0], | |
self.client_address[1]) | |
try: | |
data = self.get_data() | |
print len(data), data.encode('hex') # repr(data).replace('\\x', '')[1:-1] | |
self.send_data(dns_response(data)) | |
except Exception: | |
traceback.print_exc(file=sys.stderr) | |
class TCPRequestHandler(BaseRequestHandler): | |
def get_data(self): | |
data = self.request.recv(8192).strip() | |
sz = int(data[:2].encode('hex'), 16) | |
if sz < len(data) - 2: | |
raise Exception("Wrong size of TCP packet") | |
elif sz > len(data) - 2: | |
raise Exception("Too big TCP packet") | |
return data[2:] | |
def send_data(self, data): | |
sz = hex(len(data))[2:].zfill(4).decode('hex') | |
return self.request.sendall(sz + data) | |
class UDPRequestHandler(BaseRequestHandler): | |
def get_data(self): | |
return self.request[0].strip() | |
def send_data(self, data): | |
return self.request[1].sendto(data, self.client_address) | |
if __name__ == '__main__': | |
print "Starting nameserver..." | |
servers = [ | |
SocketServer.ThreadingUDPServer(('', PORT), UDPRequestHandler), | |
SocketServer.ThreadingTCPServer(('', PORT), TCPRequestHandler), | |
] | |
for s in servers: | |
thread = threading.Thread(target=s.serve_forever) # that thread will start one more thread for each request | |
thread.daemon = True # exit the server thread when the main thread terminates | |
thread.start() | |
print "%s server loop running in thread: %s" % (s.RequestHandlerClass.__name__[:3], thread.name) | |
try: | |
while 1: | |
time.sleep(1) | |
sys.stderr.flush() | |
sys.stdout.flush() | |
except KeyboardInterrupt: | |
pass | |
finally: | |
for s in servers: | |
s.shutdown() |
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thanks man!!!