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jvns/dns-1.rb Secret

Last active November 6, 2022 14:28
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dns-1.rb
require 'socket'
sock = UDPSocket.new
sock.bind('0.0.0.0', 12345)
sock.connect('8.8.8.8', 53)
# decode hex
hex_string = "b96201000001000000000000076578616d706c6503636f6d0000010001"
bytes = [hex_string].pack('H*')
sock.send(bytes, 0)
# receive reply
reply, _ = sock.recvfrom(1024)
puts reply.unpack('H*')
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