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