Get all interfaces and ipaddressen, python3 compatible. Tested on Linux

get_ifs.py

# Compatible with Python3, tested on Linux
# Author Arnaud Loonstra <arnaud@sphaero.org>
# based on <http://code.activestate.com/recipes/439093/#c1>
 
import socket
import fcntl
import struct
import array
import sys

def all_interfaces():
    max_possible = 128 # arbitrary. raise if needed.
    bytes = max_possible * 32
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    names = array.array('B', [0]) * bytes
    outbytes = struct.unpack('iL', fcntl.ioctl(
        s.fileno(),
        0x8912, # SIOCGIFCONF
        struct.pack('iL', bytes, names.buffer_info()[0])
        ))[0]
    namestr = names.tostring()
    lst = []
    for i in range(0, outbytes, 40):
        name = namestr[i:i+16].split(b'\x00', 1)[0]
        ip = namestr[i+20:i+24]
        lst.append((name, ip))
    return lst
 
def format_ip(addr):
    # check python version
    if sys.version_info.major > 2:
        return "%i.%i.%i.%i" %(addr[0], addr[1], addr[2], addr[3])
    return "%s.%s.%s.%s" %(addr[0], addr[1], addr[2], addr[3])
 
ifs = all_interfaces()
for i in ifs:
    print("%12s %s" % (i[0].decode('utf-8'), format_ip(i[1])))