Migration to python3

[anaselfaijah]

Hello,

I'm using your tool for a cybersecurity class. since it was written in Python 2, which is old now, i ported it to Python 3 to make it easier to use.

I used 2to3 and autopep8 as a base. Then i manually fixed the logic errors, mostly regarding how Python 3 handles bytes and strings.

What changed:

• Removed ord() calls from packet parsing logic because indexing bytes in Python 3 returns integers directly.

• Enforced byte-encoding for all packet transmissions to fix TypeError issues when concatenating strings to bytes.

• Fixed a crash in the MD5 hashing function by ensuring files are opened in binary mode ('rb') instead of text mode.

• Updated the generated dig commands to include the +noidnin flag.

• Removed unused import (binascii) and cleaned up indentation using PEP8 standards.

  => Note: the diff looks large because of the whitespace changes, but the logic is the same.

Testing:

• The script starts correctly: sudo python3 dnsteal.py 127.0.0.1 -z -v
• I successfully ran a full file transfer test.
• The MD5 checksum matched the original file.

Thanks for the tool. hope this helps others learn.