Created
July 1, 2009 05:10
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import asyncore, socket | |
from dns import resolver, rdatatype, rdataclass, message | |
# Stolen from here: | |
# http://glyphy.com/asynchronous-dns-queries-python-2008-02-09 | |
class AsyncDNS(asyncore.dispatcher): | |
def __init__(self): | |
asyncore.dispatcher.__init__(self) | |
self.r = resolver.Resolver() | |
self.query = '' | |
self.create_socket(socket.AF_INET, socket.SOCK_DGRAM) | |
self.connect((self.r.nameservers[0], self.r.port)) | |
def makeQuery(self, server): | |
self.query = message.make_query('_xmpp-server._tcp.%s' % server, | |
rdatatype.SRV, rdataclass.IN).to_wire() | |
def writable(self): | |
return (len(self.query) > 0) | |
def handle_read(self): | |
data = self.recv(4096) | |
answer = message.from_wire(data) | |
print answer.answer[0].to_text() | |
def handle_write(self): | |
self.send(self.query) | |
self.query = '' | |
def handle_accept(self): pass | |
def handle_connect(self): pass | |
def handle_bind(self): pass | |
def handle_close(self): self.close() | |
if __name__ == "__main__": | |
d = AsyncDNS() | |
d.makeQuery('livejournal.com') | |
asyncore.loop() |
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