How to use python to Detect ip addresses used and unused ip addresses in a CIDR block

This article shares how to use python to Detect ip addresses used and unused ip addresses in a CIDR block. I learned from my previous blog and added many things on my own.

The subprocess module is used.

>>> Import subprocess

>>> P = subprocess. Popen ('df-H', stdin = subprocess. PIPE, stdout = subprocess. PIPE, stderr = subprocess. PIPE, shell = True)

# Obtain the return code of the command execution result through the wait () function

>>> P. wait ()

0

# Obtain the command output result (standard output) by using the read () method

>>> P. stdout. read ()

'Filesystem Size Used Avail Use % Mounted on \ n/dev/sda1 18G 11G 5.8G 65%/\ ntmpfs 495 M 0 495 M 0%/dev/shm \ n'

# Obtain the output result of a command error using the read () method

>>> P. stderr. read ()

''

# Null, indicating no error output

# Get error output

>>> P = subprocess. popen ('ls/etc/password', stdin = subprocess. PIPE, stdout = subprocess. PIPE, stderr = subprocess. PIPE, shell = True, close_fds = True)

>>> P. stderr. read ()

'Ls: cannot access/etc/password: No such file or directory \ n'

@ Other methods for obtaining error output include read (), readline (), readlines (), close (), write (), and writelines.

#! /Usr/bin/env python

# _ * _ Coding: utf8 _*_

# By lijiajun

Import re, subprocess, OS, sys

Net_region = '2017. 192'

Print ("##################################### ####################")

Print ("# This script is mainly based on ping to test the ip addresses used and unused ip addresses of a network segment #")

Print ("# save them to/tmp/alive_ip.txt #")

Print ("# and/tmp/dead_ip.txt #")

Print ("##################################### ####################")

Print ("")

If OS. path. isfile ("/tmp/alive_ip.txt "):

OS. popen ("mv/tmp/alive_ip.txt/tmp/alive_ip.txt.old ")

Print "you can see the used ip in this file:/tmp/alive_ip.txt"

If OS. path. isfile ("/tmp/dead_ip.txt "):

OS. popen ("mv/tmp/dead_ip.txt/tmp/dead_ip.txt.old ")

Print "you can see the unused ip in this file:/tmp/dead_ip.txt"

Print ("")

Dead_ip = 0

Alive_ip = 0

Def check_alive (ip, count, timeout ):

Global alive_ip

Global dead_ip

Cmd = 'ping-c % d-w % d % s' % (count, timeout, ip)

P = subprocess. Popen (cmd,

Stdin = subprocess. PIPE,

Stdout = subprocess. PIPE,

Stderr = subprocess. PIPE,

Shell = True)

Result = p. stdout. read ()

Regx = re. findall ('2017 packet loss', result)

If len (regx) = 0:

Print ("\ 033 [1; 32; 40 m % s is UP \ 033 [0 m") % (ip)

F = file ('/tmp/alive_ip.txt', 'A ')

F. write ('% s \ n' % ip)

F. close ()

Alive_ip = alive_ip + 1

Print "alive_ip count is % d" % alive_ip

Return alive_ip

Else:

Print "\ 033 [31 m % s is DOWN \ 033 [0 m" % (ip)

F = file ('/tmp/dead_ip.txt', 'A ')

F. write ('% s \ n' % ip)

F. close ()

Dead_ip = dead_ip + 1

Print "dead_ip count is % d" % dead_ip

Return dead_ip

If name = "main ":

# F = file ('/tmp/iplist.txt ')

For I in range (1,255 ):

Ip = '% s. % s' % (net_region, I)

Print ip

Check_alive (ip, 1, 1)

Print ("")

Print "final dead_ip count is % d" % dead_ip

Print "final alived_ip count is % d" % alive_ip

The above describes how to use python to Detect ip addresses used and unused ip addresses in a CIDR block. For more information, see other related articles in the first PHP community!