python: explore available ips in the LAN

ping_all.py

# coding=utf-8

import os
from multiprocessing.dummy import Pool


def can_ping(ip):
    ret = os.system('ping -n 1 -w 1 %s > nul' % ip)
    can_ping = True if ret == 0 else False
    return can_ping, ip

# can_ping('192.168.10.210')
# can_ping('192.168.10.211')


def ping_all():
    ips = ['192.168.10.' + str(i) for i in range(1, 255)]

    reachable_cnt = 0
    with Pool(8) as pool:
        for res, ip in pool.imap(can_ping, ips):
            if res:
                print(ip)
                reachable_cnt += 1
    print(reachable_cnt)


def ping_monitor():
    ips = ['192.168.10.' + str(i) for i in range(1, 255)]
    online_ips = {}

    def ping_success(ip):
        if ip not in online_ips:
            print('found', ip)
        online_ips[ip] = 2

    def ping_fail(ip):
        if ip in online_ips:
            online_ips[ip] -= 1
            if online_ips[ip] <= 0:
                print('miss', ip)
                del online_ips[ip]

    def scan_ips(pool):
        for res, ip in pool.imap(can_ping, ips):
            if res:
                ping_success(ip)
            else:
                ping_fail(ip)

    with Pool(128) as pool:
        while True:
            scan_ips(pool)
            print('.')
ping_monitor()