def handleQuery(self, msg, addr, port):
"""Deal with incoming query packets. Provides a response if
possible."""
out = None
# Support unicast client responses
#
if port != dns._MDNS_PORT:
out = dns.DNSOutgoing(dns._FLAGS_QR_RESPONSE | dns._FLAGS_AA, 0)
for question in msg.questions:
out.addQuestion(question)
log.debug( 'Questions...')
for question in msg.questions:
log.debug( 'Question: %s', question )
if question.type == dns._TYPE_PTR:
for service in list(self.services.values()):
if question.name == service.type:
log.info( 'Service query found %s', service.name )
if out is None:
out = dns.DNSOutgoing(dns._FLAGS_QR_RESPONSE | dns._FLAGS_AA)
out.addAnswer(msg, dns.DNSPointer(service.type, dns._TYPE_PTR, dns._CLASS_IN, dns._DNS_TTL, service.name))
# devices such as AAstra phones will not re-query to
# resolve the pointer, they expect the final IP to show up
# in the response
out.addAdditionalAnswer(dns.DNSText(service.name, dns._TYPE_TXT, dns._CLASS_IN | dns._CLASS_UNIQUE, dns._DNS_TTL, service.text))
out.addAdditionalAnswer(dns.DNSService(service.name, dns._TYPE_SRV, dns._CLASS_IN | dns._CLASS_UNIQUE, dns._DNS_TTL, service.priority, service.weight, service.port, service.server))
out.addAdditionalAnswer(dns.DNSAddress(service.server, dns._TYPE_A, dns._CLASS_IN | dns._CLASS_UNIQUE, dns._DNS_TTL, service.address))
else:
try:
if out is None:
out = dns.DNSOutgoing(dns._FLAGS_QR_RESPONSE | dns._FLAGS_AA)
# Answer A record queries for any service addresses we know
if question.type == dns._TYPE_A or question.type == dns._TYPE_ANY:
for service in list(self.services.values()):
if service.server == question.name.lower():
out.addAnswer(msg, DNSAddress(question.name, dns._TYPE_A, dns._CLASS_IN | dns._CLASS_UNIQUE, dns._DNS_TTL, service.address))
service = self.services.get(question.name.lower(), None)
if not service: continue
if question.type == dns._TYPE_SRV or question.type == dns._TYPE_ANY:
out.addAnswer(msg, dns.DNSService(question.name, dns._TYPE_SRV, dns._CLASS_IN | dns._CLASS_UNIQUE, dns._DNS_TTL, service.priority, service.weight, service.port, service.server))
if question.type == dns._TYPE_TXT or question.type == dns._TYPE_ANY:
out.addAnswer(msg, dns.DNSText(question.name, dns._TYPE_TXT, dns._CLASS_IN | dns._CLASS_UNIQUE, dns._DNS_TTL, service.text))
if question.type == dns._TYPE_SRV:
out.addAdditionalAnswer(dns.DNSAddress(service.server, dns._TYPE_A, dns._CLASS_IN | dns._CLASS_UNIQUE, dns._DNS_TTL, service.address))
except Exception as err:
log.error(
'Error handling query: %s',traceback.format_exc()
)
if out is not None and out.answers:
out.id = msg.id
self.send(out, addr, port)
else:
log.debug( 'No answer for %s', [q for q in msg.questions] )
def testResponseHeaderBits(self):
generated = r.DNSOutgoing(r._FLAGS_QR_RESPONSE)
bytes = generated.packet()
print("bytes", bytes.encode())
flags = ord(bytes[2].encode()) << 8 | ord(bytes[3].encode())
print("flags ", flags)
self.assertEqual(flags, 0x8000)
def unregisterService(self, info):
"""Unregister a service."""
try:
del (self.services[info.name.lower()])
except:
pass
now = dns.currentTimeMillis()
nextTime = now
i = 0
while i < 3:
if now < nextTime:
self.wait(nextTime - now)
now = dns.currentTimeMillis()
continue
out = dns.DNSOutgoing(dns._FLAGS_QR_RESPONSE | dns._FLAGS_AA)
out.addAnswerAtTime(
dns.DNSPointer(info.type, dns._TYPE_PTR, dns._CLASS_IN, 0,
info.name), 0)
out.addAnswerAtTime(
dns.DNSService(info.name, dns._TYPE_SRV, dns._CLASS_IN, 0,
info.priority, info.weight, info.port,
info.name), 0)
out.addAnswerAtTime(
dns.DNSText(info.name, dns._TYPE_TXT, dns._CLASS_IN, 0,
info.text), 0)
if info.address:
out.addAnswerAtTime(
dns.DNSAddress(info.server, dns._TYPE_A, dns._CLASS_IN, 0,
info.address), 0)
self.send(out)
i += 1
nextTime += _UNREGISTER_TIME
def test_response_header_bits(self):
generated = r.DNSOutgoing(r._FLAGS_QR_RESPONSE)
b = generated.packet()
print("bytes", b)
#flags = ord(b[2]) << 8 | ord(b[3])
flags = b[2] << 8 | b[3]
self.assertEqual(flags, 0x8000)
def registerService(self, info, ttl=dns._DNS_TTL):
"""Registers service information to the network with a default TTL
of 60 seconds. Zeroconf will then respond to requests for
information for that service. The name of the service may be
changed if needed to make it unique on the network."""
#print "REGISTERING SERVICE!"
#log.debug(">>",self.services[info.name.lower()])
#import pdb
#pdb.set_trace()
self.checkService(info)
self.services[info.name.lower()] = info
log.debug(">>",self.services[info.name.lower()])
now = dns.currentTimeMillis()
nextTime = now
i = 0
while i < 3:
if now < nextTime:
self.wait(nextTime - now)
now = dns.currentTimeMillis()
continue
out = dns.DNSOutgoing(dns._FLAGS_QR_RESPONSE | dns._FLAGS_AA)
out.addAnswerAtTime(dns.DNSPointer(info.type, dns._TYPE_PTR, dns._CLASS_IN, ttl, info.name), 0)
out.addAnswerAtTime(dns.DNSService(info.name, dns._TYPE_SRV, dns._CLASS_IN, ttl, info.priority, info.weight, info.port, info.server), 0)
out.addAnswerAtTime(dns.DNSText(info.name, dns._TYPE_TXT, dns._CLASS_IN, ttl, info.text), 0)
if info.address:
out.addAnswerAtTime(dns.DNSAddress(info.server, dns._TYPE_A, dns._CLASS_IN, ttl, info.address), 0)
self.send(out)
i += 1
nextTime += _REGISTER_TIME
print("registerService end")
def run(self):
while 1:
event = None
now = dns.currentTimeMillis()
if len(self.list) == 0 and self.nextTime > now:
self.zeroconf.wait(self.nextTime - now)
if globals()['_GLOBAL_DONE'] or self.done:
return
now = dns.currentTimeMillis()
if self.nextTime <= now:
out = dns.DNSOutgoing(dns._FLAGS_QR_QUERY)
out.addQuestion(dns.DNSQuestion(self.type, dns._TYPE_PTR, dns._CLASS_IN))
for record in list(self.services.values()):
if not record.isExpired(now):
out.addAnswerAtTime(record, now)
self.zeroconf.send(out)
self.nextTime = now + self.delay
self.delay = min(20 * 1000, self.delay * 2)
if len(self.list) > 0:
event = self.list.pop(0)
if event is not None:
event(self.zeroconf)
def checkService(self, info):
"""Checks the network for a unique service name, modifying the
ServiceInfo passed in if it is not unique."""
now = dns.currentTimeMillis()
nextTime = now
i = 0
while i < 3:
for record in self.cache.entriesWithName(info.type):
if record.type == dns._TYPE_PTR and not record.isExpired(now) and record.alias == info.name:
if (info.name.find('.') < 0):
info.name = info.name + ".[" + info.address + ":" + info.port + "]." + info.type
self.checkService(info)
return
raise NonUniqueNameException
if now < nextTime:
self.wait(nextTime - now)
now = dns.currentTimeMillis()
continue
out = dns.DNSOutgoing(dns._FLAGS_QR_QUERY | dns._FLAGS_AA)
self.debug = out
out.addQuestion(dns.DNSQuestion(info.type, dns._TYPE_PTR, dns._CLASS_IN))
out.addAuthorativeAnswer(dns.DNSPointer(info.type, dns._TYPE_PTR, dns._CLASS_IN, dns._DNS_TTL, info.name))
self.send(out)
i += 1
nextTime += _CHECK_TIME
def testSameName(self): name = "paired.local." generated = r.DNSOutgoing(r._FLAGS_QR_RESPONSE) question = r.DNSQuestion(name, r._TYPE_SRV, r._CLASS_IN) generated.addQuestion(question) generated.addQuestion(question) parsed = r.DNSIncoming(generated.packet())
def testLongName(self):
generated = r.DNSOutgoing(r._FLAGS_QR_RESPONSE)
question = r.DNSQuestion(
"this.is.a.very.long.name.with.lots.of.parts.in.it.local.",
r._TYPE_SRV, r._CLASS_IN)
generated.addQuestion(question)
parsed = r.DNSIncoming(generated.packet())
def unregisterAllServices(self):
"""Unregister all registered services."""
if len(self.services) > 0:
now = dns.currentTimeMillis()
nextTime = now
i = 0
while i < 3:
if now < nextTime:
self.wait(nextTime - now)
now = dns.currentTimeMillis()
continue
out = dns.DNSOutgoing(dns._FLAGS_QR_RESPONSE | dns._FLAGS_AA)
for info in self.services.values():
out.addAnswerAtTime(
dns.DNSPointer(info.type, dns._TYPE_PTR, dns._CLASS_IN,
0, info.name), 0)
out.addAnswerAtTime(
dns.DNSService(info.name, dns._TYPE_SRV, dns._CLASS_IN,
0, info.priority, info.weight,
info.port, info.server), 0)
out.addAnswerAtTime(
dns.DNSText(info.name, dns._TYPE_TXT, dns._CLASS_IN, 0,
info.text), 0)
if info.address:
out.addAnswerAtTime(
dns.DNSAddress(info.server, dns._TYPE_A,
dns._CLASS_IN, 0, info.address), 0)
self.send(out)
i += 1
nextTime += _UNREGISTER_TIME
def testMatchQuestion(self):
generated = r.DNSOutgoing(r._FLAGS_QR_QUERY)
question = r.DNSQuestion("testname.local.", r._TYPE_SRV, r._CLASS_IN)
generated.addQuestion(question)
parsed = r.DNSIncoming(generated.packet())
self.assertEqual(len(generated.questions), 1)
self.assertEqual(len(generated.questions), len(parsed.questions))
self.assertEqual(question, parsed.questions[0])
def serviceAnnouncement( cls, info, ttl=dns._DNS_TTL ):
out = dns.DNSOutgoing(dns._FLAGS_QR_RESPONSE | dns._FLAGS_AA)
out.addAnswerAtTime(dns.DNSPointer(info.type, dns._TYPE_PTR, dns._CLASS_IN, ttl, info.name), 0)
out.addAnswerAtTime(dns.DNSService(info.name, dns._TYPE_SRV, dns._CLASS_IN, ttl, info.priority, info.weight, info.port, info.server), 0)
out.addAnswerAtTime(dns.DNSText(info.name, dns._TYPE_TXT, dns._CLASS_IN, ttl, info.text), 0)
if info.address:
out.addAnswerAtTime(dns.DNSAddress(info.server, dns._TYPE_A, dns._CLASS_IN, ttl, info.address), 0)
return out
def handleQuery(self, msg, addr, port):
"""Deal with incoming query packets. Provides a response if
possible."""
out = None
# Support unicast client responses
#
if port != dns._MDNS_PORT:
out = dns.DNSOutgoing(dns._FLAGS_QR_RESPONSE | dns._FLAGS_AA, 0)
for question in msg.questions:
out.addQuestion(question)
log.debug('Questions...')
for question in msg.questions:
log.debug('Question: %s', question)
if out is None:
out = dns.DNSOutgoing(dns._FLAGS_QR_RESPONSE | dns._FLAGS_AA)
try:
self.responses(question, msg, out)
except Exception, err:
log.error('Error handling query: %s', traceback.format_exc())
def testNumbers(self): generated = r.DNSOutgoing(r._FLAGS_QR_RESPONSE) bytes = generated.packet() numQuestions = ord(bytes[4]) << 8 | ord(bytes[5]) numAnswers = ord(bytes[6]) << 8 | ord(bytes[7]) numAuthorities = ord(bytes[8]) << 8 | ord(bytes[9]) numAddtionals = ord(bytes[10]) << 8 | ord(bytes[11]) self.assertEqual(numQuestions, 0) self.assertEqual(numAnswers, 0) self.assertEqual(numAuthorities, 0) self.assertEqual(numAddtionals, 0)
def testNumbersQuestions(self):
generated = r.DNSOutgoing(r._FLAGS_QR_RESPONSE)
question = r.DNSQuestion("testname.local.", r._TYPE_SRV, r._CLASS_IN)
for i in range(0, 10):
generated.addQuestion(question)
bytes = generated.packet()
numQuestions = ord(bytes[4]) << 8 | ord(bytes[5])
numAnswers = ord(bytes[6]) << 8 | ord(bytes[7])
numAuthorities = ord(bytes[8]) << 8 | ord(bytes[9])
numAddtionals = ord(bytes[10]) << 8 | ord(bytes[11])
self.assertEqual(numQuestions, 10)
self.assertEqual(numAnswers, 0)
self.assertEqual(numAuthorities, 0)
self.assertEqual(numAddtionals, 0)
def testExceedinglyLongName(self):
generated = r.DNSOutgoing(r._FLAGS_QR_RESPONSE)
name = "%slocal." % ("part." * 1000)
question = r.DNSQuestion(name, r._TYPE_SRV, r._CLASS_IN)
generated.addQuestion(question)
parsed = r.DNSIncoming(generated.packet())
def testParseOwnPacketSimpleUnicast(self): generated = r.DNSOutgoing(0, 0) parsed = r.DNSIncoming(generated.packet())
def testTransactionID(self): """ID must be zero in a DNS-SD packet""" generated = r.DNSOutgoing(r._FLAGS_QR_QUERY) bytes = generated.packet() id = ord(bytes[0]) << 8 | ord(bytes[1]) self.assertEqual(id, 0)
def testQueryHeaderBits(self): generated = r.DNSOutgoing(r._FLAGS_QR_QUERY) bytes = generated.packet() flags = ord(bytes[2]) << 8 | ord(bytes[3]) self.assertEqual(flags, 0x0)
def testResponseHeaderBits(self): generated = r.DNSOutgoing(r._FLAGS_QR_RESPONSE) bytes = generated.packet() flags = ord(bytes[2]) << 8 | ord(bytes[3]) self.assertEqual(flags, 0x8000)
def test_query_header_bits(self):
generated = r.DNSOutgoing(r._FLAGS_QR_QUERY)
b = generated.packet().decode()
flags = ord(b[2]) << 8 | ord(b[3])
self.assertEqual(flags, 0x0)
def test_transaction_id(self):
# ID must be zero in a DNS-SD packet
generated = r.DNSOutgoing(r._FLAGS_QR_QUERY)
b = generated.packet().decode()
id = ord(b[0]) << 8 | ord(b[1])
self.assertEqual(id, 0)
def testParseOwnPacketQuestion(self):
generated = r.DNSOutgoing(r._FLAGS_QR_QUERY)
generated.addQuestion(
r.DNSQuestion("testname.local.", r._TYPE_SRV, r._CLASS_IN))
parsed = r.DNSIncoming(generated.packet())
print("parsed questions %s " % parsed.questions)
def testParseOwnPacketFlags(self):
generated = r.DNSOutgoing(r._FLAGS_QR_QUERY)
parsed = r.DNSIncoming(generated.packet())
print("parsed %s " % parsed)
def testParseOwnPacketSimpleUnicast(self):
generated = r.DNSOutgoing(0, 0)
parsed = r.DNSIncoming(generated.packet())
print("parsed %s " % parsed)
self.assertEqual(type(parsed), r.DNSIncoming)
def testExceedinglyLongNamePart(self):
name = "%s.local." % ("a" * 1000)
generated = r.DNSOutgoing(r._FLAGS_QR_RESPONSE)
question = r.DNSQuestion(name, r._TYPE_SRV, r._CLASS_IN)
generated.addQuestion(question)
self.assertRaises(r.NamePartTooLongException, generated.packet)
