| Guido van Rossum | ef25370 | 1996-07-30 19:04:18 +0000 | [diff] [blame] | 1 | import sys |
| 2 | import dnslib |
| 3 | import dnstype |
| 4 | import dnsopcode |
| 5 | import dnsclass |
| 6 | import socket |
| 7 | import select |
| 8 | |
| 9 | def main(): |
| 10 | server = 'cnri.reston.va.us' # How? |
| 11 | port = 53 |
| 12 | opcode = dnsopcode.QUERY |
| 13 | rd = 0 |
| 14 | qtype = dnstype.MX |
| 15 | qname = sys.argv[1:] and sys.argv[1] or 'www.python.org' |
| 16 | m = dnslib.Mpacker() |
| 17 | m.addHeader(0, |
| 18 | 0, opcode, 0, 0, rd, 0, 0, 0, |
| 19 | 1, 0, 0, 0) |
| 20 | m.addQuestion(qname, qtype, dnsclass.IN) |
| 21 | request = m.getbuf() |
| 22 | s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) |
| 23 | s.connect((server, port)) |
| 24 | s.send(request) |
| 25 | while 1: |
| 26 | r, w, x = [s], [], [] |
| 27 | r, w, x = select.select(r, w, x, 0.333) |
| 28 | print r, w, x |
| 29 | if r: |
| 30 | reply = s.recv(1024) |
| 31 | u = dnslib.Munpacker(reply) |
| 32 | dnslib.dumpM(u) |
| 33 | break |
| 34 | |
| 35 | main() |