I'm reading data over netlink socket. One of the TLVs contain IPv4 address as a sequence of 4 bytes, e.g. 0x01 0x02 0x03 0x0b for address 1.2.3.11 :
import socket
...
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])
...
# skip all headers and get to TLVs
data = data[24:]
remaining = msg_len - 24
while remaining:
rta_len, rta_type = struct.unpack("=HH", data[:4])
...
rta_data = data[4:rta_len]
...
if rta_type == IFA_ADDRESS:
# rta_data[:4] contains IP address
...
I need to read rta_data[:4] in such way that I get a string which I can pass on further. I tried to play with encode() or decode() string methods, but with no luck. I guess I should be walking through rta_data and convert each byte into string and put dots in between? I wonder if there is a one-liner for this.
