def lookup (self, qname, qtype, timeout=10, retries=3, port=53):
m = new_packer()
while 1:
qid = random.randrange (65536)
# avoid collisions
if qid not in self.inflight_ids:
break
m.addHeader(qid, 0, packet.OPCODE.QUERY, 0, 0, 1, 0, 0,0,1,0, 0, 0)
m.addQuestion (qname, qtype, packet.CLASS.IN)
p = m.getbuf()
for addr in self.nameservers:
for i in range (retries):
self.inflight.acquire (1)
self.inflight_ids.add (qid)
try:
s = coro.udp_sock()
s.connect ((addr, port))
s.send (p)
try:
reply = coro.with_timeout (timeout, s.recv, 3000)
if not reply:
continue
r = unpack_reply(reply)
if r.id != qid:
raise QueryFailed ("bad id in reply")
else:
return r
except coro.TimeoutError:
pass
finally:
self.inflight.release (1)
self.inflight_ids.remove (qid)
raise QueryFailed ("no reply from nameservers")
def t1(qname, qtype):
p = t0(qname, getattr(dns.TYPE, qtype))
s = coro.udp_sock()
s.connect(('192.168.200.1', 53))
s.send(p)
r = s.recv(8192)
coro.write_stderr('reply=%r\n' % (r, ))
u = dns.Unpacker(r)
return u.unpack()
def t1 (qname, qtype):
p = t0 (qname, getattr (dns.TYPE, qtype))
s = coro.udp_sock()
s.connect (('192.168.200.1', 53))
s.send (p)
r = s.recv (8192)
coro.write_stderr ('reply=%r\n' % (r,))
u = dns.Unpacker (r)
return u.unpack()
def lookup (self, qname, qtype, timeout=10, retries=3):
m = packet.Packer()
h = packet.Header()
while 1:
qid = random.randrange (65536)
# avoid collisions
if qid not in self.inflight_ids:
break
h.id = qid
h.opcode = packet.OPCODE.QUERY
h.rd = 1
h.qdcount = 1
m.addHeader (h)
m.addQuestion (qname, qtype, packet.CLASS.IN)
p = m.getbuf()
for addr in self.nameservers:
for i in range (retries):
self.inflight.acquire (1)
self.inflight_ids.add (qid)
try:
s = coro.udp_sock()
s.connect ((addr, 53))
s.send (p)
try:
reply = coro.with_timeout (timeout, s.recv, 1000)
u = packet.Unpacker (reply)
result = u.unpack()
rh = result[0]
if rh.id != qid:
raise QueryFailed ("bad id in reply")
else:
return result
except coro.TimeoutError:
pass
finally:
self.inflight.release (1)
self.inflight_ids.remove (qid)
raise QueryFailed ("no reply from nameservers")
def lookup(self, qname, qtype, timeout=10, retries=3):
m = packet.Packer()
h = packet.Header()
while 1:
qid = random.randrange(65536)
# avoid collisions
if qid not in self.inflight_ids:
break
h.id = qid
h.opcode = packet.OPCODE.QUERY
h.rd = 1
h.qdcount = 1
m.addHeader(h)
m.addQuestion(qname, qtype, packet.CLASS.IN)
p = m.getbuf()
for addr in self.nameservers:
for i in range(retries):
self.inflight.acquire(1)
self.inflight_ids.add(qid)
try:
s = coro.udp_sock()
s.connect((addr, 53))
s.send(p)
try:
reply = coro.with_timeout(timeout, s.recv, 1000)
u = packet.Unpacker(reply)
result = u.unpack()
rh = result[0]
if rh.id != qid:
raise QueryFailed("bad id in reply")
else:
return result
except coro.TimeoutError:
pass
finally:
self.inflight.release(1)
self.inflight_ids.remove(qid)
raise QueryFailed("no reply from nameservers")
