How to use python to detect used IP and unused IP of a certain network segment

I learned from the blogs of my predecessors and then added a lot of things myself.

The subprocess module is used

>>> import subprocess

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

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

>>> p.wait()

0

#Get the command output result (standard output) through the read() method

> >> p.stdout.read()

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

#Get the command error output result through the read() method

>>> p.stderr.read()          

''

# is empty, indicating that there is no error output

#Get error output

object at 0x7f267528dbd0>

> ;>> 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'

@Get other error output There are also methods: read(), readline(), readlines(), close(), write() and writelines(), etc.

#!/usr/bin/env python

#_*_ coding:utf8 _*_

# by lijiajun

import re,subprocess,os,sys

net_region='192.168.3'

print("

#")

print("#This script is mainly based on ping, testing a certain Network segment used ip and unused ip                                                                                                                                                                                       #" /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

,

time

out ):

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('100% packet loss',result)

if len(regx)==0:

print("\033[1;32;40m %s is UP \033[0m") % (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[31m %s is DOWN\033[0m" % (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

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