mirror of https://github.com/python/cpython
36 lines
848 B
Python
Executable File
36 lines
848 B
Python
Executable File
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()
|