I have a code snippet which print interface information if any new interface is getting up, but it prints same interface information multiple times
import os
import socket
import struct
# These constants map to constants in the Linux kernel. This is a crappy
# way to get at them, but it'll do for now.
RTMGRP_LINK = 1
NLMSG_NOOP = 1
NLMSG_ERROR = 2
RTM_NEWLINK = 16
RTM_DELLINK = 17
IFLA_IFNAME = 3
# Create the netlink socket and bind to RTMGRP_LINK,
s = socket.socket(socket.AF_NETLINK, socket.SOCK_RAW, socket.NETLINK_ROUTE)
s.bind((os.getpid(), RTMGRP_LINK))
while True:
data = s.recv(65535)
msg_len, msg_type, flags, seq, pid = struct.unpack("=LHHLL", data[:16])
if msg_type == NLMSG_NOOP:
print "no-op"
continue
elif msg_type == NLMSG_ERROR:
print "error"
break
# We fundamentally only care about NEWLINK messages in this version.
if msg_type != RTM_NEWLINK:
continue
data = data[16:]
family, _, if_type, index, flags, change = struct.unpack("=BBHiII", data[:16])
remaining = msg_len - 32
data = data[16:]
while remaining:
rta_len, rta_type = struct.unpack("=HH", data[:4])
# This check comes from RTA_OK, and terminates a string of routing
# attributes.
if rta_len < 4:
break
rta_data = data[4:rta_len]
increment = (rta_len + 4 - 1) & ~(4 - 1)
data = data[increment:]
remaining -= increment
# Hoorah, a link is up!
if rta_type == IFLA_IFNAME:
print "New link %s" % rta_data
run the above program and restart network-manager
sudo service network-manager restart
output :
New link enp0s25
New link lo
New link wlp4s0
New link wlp4s0
New link wlp4s0
New link wlp4s0
New link wlp4s0
New link wlp4s0
New link enp0s25
New link wlp4s0
New link wlp4s0
New link wlp4s0
New link wlp4s0
New link wlp4s0
New link wlp4s0
New link wlp4s0
New link wlp4s0
New link wlp4s0
New link wlp4s0
I am excepting to get following output only
New link enp0s25
New link lo
New link wlp4s0
Also I got a c program which return me the right output but I want this in python
