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import sys
import dnslib
import dnstype
import dnsopcode
import dnsclass
import socket
import select
def main():
server = 'cnri.reston.va.us' # How?
port = 53
opcode = dnsopcode.QUERY
rd = 0
qtype = dnstype.MX
qname = sys.argv[1:] and sys.argv[1] or 'www.python.org'
m = dnslib.Mpacker()
m.addHeader(0,
0, opcode, 0, 0, rd, 0, 0, 0,
1, 0, 0, 0)
m.addQuestion(qname, qtype, dnsclass.IN)
request = m.getbuf()
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect((server, port))
s.send(request)
while 1:
r, w, x = [s], [], []
r, w, x = select.select(r, w, x, 0.333)
print r, w, x
if r:
reply = s.recv(1024)
u = dnslib.Munpacker(reply)
dnslib.dumpM(u)
break
main()
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