CODEWITHSUNDEEP
pythondecodingnetbios
user1473508
user1473508

Reputation: 195

Decode Netbios Name Python

I would like to know what would be the best way to do the opposite of this post : encode Netbios name python

So to encode, you could use this :

encoded_name = ''.join([chr((ord(c)>>4) + ord('A'))
               + chr((ord(c)&0xF) + ord('A')) for c in original_name])

But to decode this for example :

Netbios_Name= "\x46\x45\x45\x46\x46\x44\x45\x45\x46\x45\x45\x45\x45\x45\x46\x44\x46\x44\x46\x44\x43\x41\x43\x41\x43\x41\x43\x41\x43\x41\x43\x41"
## When correctly reversed, Netbios_Name should output in ASCII : "TESDTDDSSS"

I though about the reverse of this function, but i can't figure why it doesn't work.

Thanks !

Upvotes: 0

Views: 3750

Answers (1)

dusan
dusan

Reputation: 9273

Use this function (taken from dpkt source code):

def decode_name(nbname):
    """Return the NetBIOS first-level decoded nbname."""
    if len(nbname) != 32:
        return nbname
    l = []
    for i in range(0, 32, 2):
        l.append(chr(((ord(nbname[i]) - 0x41) << 4) |
                     ((ord(nbname[i+1]) - 0x41) & 0xf)))
    return ''.join(l).split('\x00', 1)[0]

So:

>> decode_name(Netbios_Name).strip()
'TESDTDDSSS'

Upvotes: 2

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