def test_transfer(self):
"""
An attempt is made to transfer the zone for the domain the
L{SecondaryAuthority} was constructed with from the server address it
was constructed with when L{SecondaryAuthority.transfer} is called.
"""
secondary = SecondaryAuthority.fromServerAddressAndDomain(
('192.168.1.2', 1234), 'example.com')
secondary._reactor = reactor = MemoryReactorClock()
secondary.transfer()
# Verify a connection attempt to the server address above
host, port, factory, timeout, bindAddress = reactor.tcpClients.pop(0)
self.assertEqual(host, '192.168.1.2')
self.assertEqual(port, 1234)
# See if a zone transfer query is issued.
proto = factory.buildProtocol((host, port))
transport = StringTransport()
proto.makeConnection(transport)
msg = Message()
# DNSProtocol.writeMessage length encodes the message by prepending a
# 2 byte message length to the buffered value.
msg.decode(StringIO(transport.value()[2:]))
self.assertEqual(
[dns.Query('example.com', dns.AXFR, dns.IN)], msg.queries)
def queryTCP(queries):
self.assertEqual(queries, m.queries)
response = Message()
response.answers = ['answer']
response.authority = ['authority']
response.additional = ['additional']
return succeed(response)
def test_transfer(self):
"""
An attempt is made to transfer the zone for the domain the
L{SecondaryAuthority} was constructed with from the server address it
was constructed with when L{SecondaryAuthority.transfer} is called.
"""
secondary = SecondaryAuthority.fromServerAddressAndDomain(
('192.168.1.2', 1234), 'example.com')
secondary._reactor = reactor = MemoryReactorClock()
secondary.transfer()
# Verify a connection attempt to the server address above
host, port, factory, timeout, bindAddress = reactor.tcpClients.pop(0)
self.assertEqual(host, '192.168.1.2')
self.assertEqual(port, 1234)
# See if a zone transfer query is issued.
proto = factory.buildProtocol((host, port))
transport = StringTransport()
proto.makeConnection(transport)
msg = Message()
# DNSProtocol.writeMessage length encodes the message by prepending a
# 2 byte message length to the buffered value.
msg.decode(StringIO(transport.value()[2:]))
self.assertEqual([dns.Query('example.com', dns.AXFR, dns.IN)],
msg.queries)
def buildResponse(inMessage):
outMessage = Message(id=inMessage.id, answer=1, opCode=inMessage.opCode, recDes=1, recAv=1, auth=1, authenticData=1)
outMessage.queries = inMessage.queries
rcode = NOERROR
querytlds = []
for query in inMessage.queries:
tld = query.name.name.decode("utf-8").lower().split(".")[-1]
if not tld in tlds:
if rcode != SERVFAIL:
rcode = REFUSED
if not tld in querytlds: # SOA even if wrong type
querytlds.append(tld)
if not (query.type == 28 or query.type == 255): # AAAA or ALL
continue # NOERROR without record
try:
error, queryRRH = doQuery(query)
if error:
print("error", query.name.name.decode("utf-8"), error)
if len(inMessage.queries) < 2:
rcode = error
elif error == NOERROR: # Don't change for NOERROR
pass
elif error == SERVFAIL or rcode == SERVFAIL: # SERVFAIL replaces all
rcode = SERVFAIL
elif error == REFUSED or rcode == REFUSED: # Refused replaces all but SERVFAIL
rcode = REFUSED
elif error == NXDOMAIN or rcode == NXDOMAIN: # NXDOMAIN
rcode = NXDOMAIN
else:
print("Unexpected error from doQuery:", error)
rcode = SERVFAIL
except Exception as e:
rcode = SERVFAIL
print("oops", query, traceback.format_exc())
outMessage.answers = []
querytlds = []
break
if queryRRH != None:
outMessage.answers.append(queryRRH)
for tld in querytlds:
outMessage.authority.append(RRHeader(
name=tld,
type=6, # SOA
cls=query.cls,
ttl=ttl,
payload=Record_SOA(
mname=tld,
rname="", serial=int(time()/ttl),
refresh=ttl, retry=ttl, expire=ttl, minimum=ttl),
auth=True))
outMessage.rCode = rcode
return(outMessage)
def _respond(self, answers=[], authority=[], additional=[], rCode=OK):
"""
Create a L{Message} suitable for use as a response to a query.
@param answers: A C{list} of two-tuples giving data for the answers
section of the message. The first element of each tuple is a name
for the L{RRHeader}. The second element is the payload.
@param authority: A C{list} like C{answers}, but for the authority
section of the response.
@param additional: A C{list} like C{answers}, but for the
additional section of the response.
@param rCode: The response code the message will be created with.
@return: A new L{Message} initialized with the given values.
"""
response = Message(rCode=rCode)
for (section, data) in [
(response.answers, answers),
(response.authority, authority),
(response.additional, additional),
]:
section.extend([
RRHeader(name,
record.TYPE,
getattr(record, "CLASS", IN),
payload=record) for (name, record) in data
])
return response
def test_notifyMessageReceived(self):
"""
L{DNSServerFactory.messageReceived} passes messages with an opcode
of C{OP_NOTIFY} on to L{DNSServerFactory.handleNotify}.
"""
# RFC 1996, section 4.5
opCode = 4
self._messageReceivedTest('handleNotify', Message(opCode=opCode))
def test_lookupAddress(self):
"""
L{SecondaryAuthority.lookupAddress} returns a L{Deferred} that fires
with the I{A} records the authority has cached from the primary.
"""
secondary = SecondaryAuthority.fromServerAddressAndDomain(
(b'192.168.1.2', 1234), b'example.com')
secondary._reactor = reactor = MemoryReactorClock()
secondary.transfer()
host, port, factory, timeout, bindAddress = reactor.tcpClients.pop(0)
proto = factory.buildProtocol((host, port))
transport = StringTransport()
proto.makeConnection(transport)
query = Message(answer=1, auth=1)
query.decode(StringIO(transport.value()[2:]))
# Generate a response with some data we can check.
soa = Record_SOA(
mname=b'ns1.example.com',
rname='admin.example.com',
serial=123456,
refresh=3600,
minimum=4800,
expire=7200,
retry=9600,
ttl=12000,
)
a = Record_A(b'192.168.1.2', ttl=0)
answer = Message(id=query.id, answer=1, auth=1)
answer.answers.extend([
RRHeader(b'example.com', type=SOA, payload=soa),
RRHeader(b'example.com', payload=a),
RRHeader(b'example.com', type=SOA, payload=soa),
])
data = answer.toStr()
proto.dataReceived(pack('!H', len(data)) + data)
result = self.successResultOf(secondary.lookupAddress('example.com'))
self.assertEqual((
[RRHeader(b'example.com', payload=a, auth=True)], [], []), result)
def test_updateMessageReceived(self):
"""
L{DNSServerFactory.messageReceived} passes messages with an opcode
of C{OP_UPDATE} on to L{DNSServerFactory.handleOther}.
This may change if the implementation ever covers update messages.
"""
# RFC 2136, section 1.3
opCode = 5
self._messageReceivedTest('handleOther', Message(opCode=opCode))
def _queryTest(self, filter):
"""
Invoke L{Resolver._query} and verify that it sends the correct DNS
query. Deliver a canned response to the query and return whatever the
L{Deferred} returned by L{Resolver._query} fires with.
@param filter: The value to pass for the C{filter} parameter to
L{Resolver._query}.
"""
reactor = MemoryReactor()
resolver = Resolver([], reactor=reactor)
d = resolver._query(
Query(b'foo.example.com', A, IN), [('1.1.2.3', 1053)], (30,),
filter)
# A UDP port should have been started.
portNumber, transport = reactor.udpPorts.popitem()
# And a DNS packet sent.
[(packet, address)] = transport._sentPackets
message = Message()
message.fromStr(packet)
# It should be a query with the parameters used above.
self.assertEqual(message.queries, [Query(b'foo.example.com', A, IN)])
self.assertEqual(message.answers, [])
self.assertEqual(message.authority, [])
self.assertEqual(message.additional, [])
response = []
d.addCallback(response.append)
self.assertEqual(response, [])
# Once a reply is received, the Deferred should fire.
del message.queries[:]
message.answer = 1
message.answers.append(RRHeader(
b'foo.example.com', payload=Record_A('5.8.13.21')))
transport._protocol.datagramReceived(
message.toStr(), ('1.1.2.3', 1053))
return response[0]
def test_truncatedMessage(self):
"""
Test that a truncated message results in an equivalent request made via
TCP.
"""
m = Message(trunc=True)
m.addQuery('example.com')
def queryTCP(queries):
self.assertEqual(queries, m.queries)
response = Message()
response.answers = ['answer']
response.authority = ['authority']
response.additional = ['additional']
return succeed(response)
self.resolver.queryTCP = queryTCP
d = self.resolver.filterAnswers(m)
d.addCallback(
self.assertEqual, (['answer'], ['authority'], ['additional']))
return d
def datagramReceived(self, data, addr):
m = Message()
try:
m.fromStr(data)
except EOFError:
log.msg("Truncated packet (%d bytes) from %s" % (len(data), addr))
return
except:
log.err(failure.Failure(), "Unexpected decoding error")
return
if m.id in self.liveMessages:
d, canceller = self.liveMessages[m.id]
del self.liveMessages[m.id]
canceller.cancel()
try:
d.callback(m)
except:
log.err()
else:
if m.id not in self.resends:
self.controller.messageReceived(m, self)
def _queryTest(self, filter):
"""
Invoke L{Resolver._query} and verify that it sends the correct DNS
query. Deliver a canned response to the query and return whatever the
L{Deferred} returned by L{Resolver._query} fires with.
@param filter: The value to pass for the C{filter} parameter to
L{Resolver._query}.
"""
reactor = MemoryReactor()
resolver = Resolver([], reactor=reactor)
d = resolver._query(Query(b'foo.example.com', A, IN),
[('1.1.2.3', 1053)], (30, ), filter)
# A UDP port should have been started.
portNumber, transport = reactor.udpPorts.popitem()
# And a DNS packet sent.
[(packet, address)] = transport._sentPackets
msg = Message()
msg.fromStr(packet)
# It should be a query with the parameters used above.
self.assertEqual(msg.queries, [Query(b'foo.example.com', A, IN)])
self.assertEqual(msg.answers, [])
self.assertEqual(msg.authority, [])
self.assertEqual(msg.additional, [])
response = []
d.addCallback(response.append)
self.assertEqual(response, [])
# Once a reply is received, the Deferred should fire.
del msg.queries[:]
msg.answer = 1
msg.answers.append(
RRHeader(b'foo.example.com', payload=Record_A('5.8.13.21')))
transport._protocol.datagramReceived(msg.toStr(), ('1.1.2.3', 1053))
return response[0]
def test_extractAuthorityDeprecated(self):
"""
Calling L{root.extractAuthority} produces a deprecation warning.
"""
extractAuthority(Message(), {})
warnings = self.flushWarnings([self.test_extractAuthorityDeprecated])
self.assertEqual(warnings[0]['category'], DeprecationWarning)
self.assertEqual(
warnings[0]['message'],
'twisted.names.root.extractAuthority is deprecated since Twisted '
'10.0. Please inspect the Message object directly.')
self.assertEqual(len(warnings), 1)
def dataReceived(self, data):
self.buffer += data
while self.buffer:
if self.length is None and len(self.buffer) >= 2:
self.length = struct.unpack('!H', self.buffer[:2])[0]
self.buffer = self.buffer[2:]
if len(self.buffer) >= self.length:
myChunk = self.buffer[:self.length]
m = Message()
m.fromStr(myChunk)
try:
d, canceller = self.liveMessages[m.id]
except KeyError:
self.controller.messageReceived(m, self)
else:
del self.liveMessages[m.id]
canceller.cancel()
try:
if self.factory.controller is not None:
d, self.factory.controller = self.factory.controller, None
message = Message()
strio = StringIO.StringIO(myChunk)
message.encode(strio)
back = strio.getvalue()
b = m.toStr()
d.callback(b)
# d.callback(back)
# print 'dir(self.factory):',dir(self.factory.ip)
# d.callback(m.toStr())
except:
log.err()
self.buffer = self.buffer[self.length:]
self.length = None
else:
break
def test_lookupAddress(self):
"""
L{SecondaryAuthority.lookupAddress} returns a L{Deferred} that fires
with the I{A} records the authority has cached from the primary.
"""
secondary = SecondaryAuthority.fromServerAddressAndDomain(
("192.168.1.2", 1234), b"example.com")
secondary._reactor = reactor = MemoryReactorClock()
secondary.transfer()
host, port, factory, timeout, bindAddress = reactor.tcpClients.pop(0)
proto = factory.buildProtocol((host, port))
transport = StringTransport()
proto.makeConnection(transport)
query = Message(answer=1, auth=1)
query.decode(BytesIO(transport.value()[2:]))
# Generate a response with some data we can check.
soa = Record_SOA(
mname=b"ns1.example.com",
rname="admin.example.com",
serial=123456,
refresh=3600,
minimum=4800,
expire=7200,
retry=9600,
ttl=12000,
)
a = Record_A(b"192.168.1.2", ttl=0)
answer = Message(id=query.id, answer=1, auth=1)
answer.answers.extend([
RRHeader(b"example.com", type=SOA, payload=soa),
RRHeader(b"example.com", payload=a),
RRHeader(b"example.com", type=SOA, payload=soa),
])
data = answer.toStr()
proto.dataReceived(pack("!H", len(data)) + data)
result = self.successResultOf(secondary.lookupAddress("example.com"))
self.assertEqual(
([RRHeader(b"example.com", payload=a, auth=True)], [], []), result)
def buildResponseBytes(data):
inMessage = Message()
inMessage.fromStr(data)
return(buildResponse(inMessage).toStr())
def _rcodeTest(self, rcode, exc):
m = Message(rCode=rcode)
err = self.resolver.filterAnswers(m)
err.trap(exc)
