search

charlestolley / python-snmp

A user-friendly SNMP library
MIT License
15 stars 3 forks source link

Garbled hex-string #7

Closed KkristJ closed 6 months ago

KkristJ commented 6 months ago

Hi, using snmp 0.7.1 on vscode on windows 11 I get garbled hex-string occasionally/always... I compare to linux snmpwalk. I read switches, mainly HP, and most snmp data is correct, but MAC adresses and longer hex strings are shortened and garbled. I do

    response = localhost.get(oid)
    var = response.variables[0].value.data

and expect for instance '00:0a:cd:42:2f:24', but get b'\x00\n\xcdA/#'. Is there i fix for this? Thanks

charlestolley commented 6 months ago

What you are describing is not a bug. A MAC address is 6 bytes long, so b'\x00\n\xcdA/#' is perfectly valid. If you use a tool like snmpget, it will print it in the "00:0a:cd:41:2f:23" format that you are expecting, but this library operates at a slightly lower level than the netsnmp command-line tools.

This formatting is very simple to implement. Here's an example, which I ran in the Python interpreter shell:

>>> def format_mac(addr):
...     return ":".join((f"{byte:02x}" for byte in addr))
... 
>>> format_mac(b'\x00\n\xcdA/#')
'00:0a:cd:41:2f:23'
KkristJ commented 6 months ago

Thank you, Charles