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#!/usr/bin/env python | |
import random | |
import struct | |
import sys | |
RR_TYPE_A = 1 | |
RR_TYPE_NS = 2 | |
RR_TYPE_CNAME = 5 | |
RR_TYPE_SOA = 6 | |
RR_TYPE_PTR = 12 | |
RR_TYPE_MX = 15 | |
RR_TYPE_TXT = 16 | |
RR_CLASS_IN = 1 | |
def gen_header(ident, flags, qcount, acount, nscount, arcount): | |
return struct.pack("!HHHHHH", | |
ident, flags, | |
qcount, acount, | |
nscount, arcount) | |
def gen_name(name): | |
buffer = b"" | |
for part in name.split('.'): | |
label = part.encode("ascii") | |
buffer += bytes([len(label)]) + label | |
return buffer + b'\0' | |
def gen_rr(name, typ, clas, ttl, rd): | |
buffer = gen_name(name) | |
buffer += struct.pack("!HHIH", typ, clas, ttl, len(rd)) | |
buffer += rd | |
return buffer | |
sys.stdout.buffer.write(gen_header(random.getrandbits(16), 0x0001, 0, 2, 0, 0)) | |
sys.stdout.buffer.write(gen_rr('', RR_TYPE_TXT, RR_CLASS_IN, 0xabcd, b'b')) | |
sys.stdout.buffer.write(gen_rr('', RR_TYPE_TXT, RR_CLASS_IN, 0xabcd, b'g')) |
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