utils.py

import os
import socket
import struct
import fcntl

def get_lan_ip():
    try:
        ip = socket.gethostbyname(socket.gethostname())
        if ip.startswith("127.") and os.name != "nt":
            interfaces = ["eth0", "eth1", "eth2", "wlan0", "wlan1", "wifi0", "ath0", "ath1", "ppp0"]
            for ifname in interfaces:
                try:
                    ip = get_interface_ip(ifname)
                    break
                except IOError:
                    pass
    except socket.gaierror:
        return get_lan_ip_fallback()
    return ip

def get_interface_ip(ifname):
    s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    return socket.inet_ntoa(fcntl.ioctl(s.fileno(), 0x8915, struct.pack('256s', ifname[:15].encode('utf-8')))[20:24])

def get_lan_ip_fallback():
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        s.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
        s.connect(('<broadcast>', 0))
        return s.getsockname()[0]
    except Exception as err:
        print(err)
        return None