python: print a netlink message in hex

Asked Oct 25 '21 at 20:39

Active Oct 25 '21 at 20:39

Viewed 170 times

import os
import socket
import struct

...

s = socket.socket(socket.AF_NETLINK, socket.SOCK_RAW, socket.NETLINK_ROUTE)
s.bind((os.getpid(), RTMGRP_IPV4_IFADDR))

while True:
   data = s.recv(65535)
   msg_len, msg_type, flags, seq, pid = struct.unpack("=LHHLL", data[:16])

   ...

   # dump data in hex

I would like to print the first 64 bytes of the data, print data returns garbage, I think this is because data needs to be unpacked?

I also tried ' '.join(str(x) for x in s[:len(s)]) but it doesn't help either. What would be the right way to dump data read from netlink socket?

asked Oct 25 '21 at 20:39

Mark

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The easy way is to say `data[:64].encode('hex')`. This works for Python 2 only. – Tim Roberts Oct 25 '21 at 20:42
@js-on `data` is already a `bytes` string so there is not need to encode it. Just do `data[:64].hex()` – Serge Ballesta Oct 25 '21 at 20:55
@TimRoberts, thanks for help. – Mark Oct 26 '21 at 00:17

python: print a netlink message in hex

0 Answers0