Script that generate network-scripts file for required ip range

generate_network_config.py

#!/usr/bin/env python

import os
import sys
import getopt

if __name__ == "__main__":
    options, remaining = getopt.getopt(sys.argv[1:], 'r:i', ['range=', 'iface='])
    
    #print('ARGV      :', sys.argv[1:])
    #print('OPTIONS   :', options)
    
    iprange = None
    interface = None
    
    for opt, arg in options:
        if opt in ('-r', '--range'):
            iprange = arg
        elif opt in ('-i', '--iface'):
            interface = arg
    
    if iprange == None or interface == None:
        print("Usage: "+sys.argv[0]+" --range=1.1.1.1-2 --iface=eth0\n")
        sys.exit(1)
    
    firstip, last_octet = iprange.split('-')
    
    config_file = "/etc/sysconfig/network-scripts/ifcfg-"+interface
    config_range_file = "/etc/sysconfig/network-scripts/ifcfg-"+interface+"-range0"
    if os.path.isfile(config_file) == False:
        print("file "+config_file+" is not exists\n")
        sys.exit(1)
    
    a,b,c,d = firstip.split('.')
    lastip = '.'.join( [a, b, c, last_octet] )
    secondip = '.'.join( [a, b, c, str(int(d)+1)] )
    gatewayip = '.'.join( [a, b, c, '1'] )
    count = int(last_octet) - int(d)
    if count>0:
        print("Let's generate configs for "+str(count)+" ipv4 addresses")
    
    ifcfg_file = open(config_file, "w")
    ifcfg_file.write("DEVICE=\""+interface+"\"\n")
    ifcfg_file.write("BOOTPROTO=\"none\"\n")
    ifcfg_file.write("ONBOOT=\"yes\"\n")
    ifcfg_file.write("TYPE=\"Ethernet\"\n")
    ifcfg_file.write("IPADDR=\""+firstip+"\"\n")
    ifcfg_file.write("NETMASK=\"255.255.255.0\"\n")
    ifcfg_file.write("GATEWAY=\""+gatewayip+"\"\n")
    ifcfg_file.write("DNS1=\"8.8.8.8\"\n")
    ifcfg_file.write("DNS2=\"8.8.4.4\"\n")
    if count>1:
        ifcfg_file.write("ARPCHECK=no\n")
        ifcfg_range_file = open(config_range_file, "w")
        ifcfg_range_file.write("IPADDR_START=\""+secondip+"\"\n")
        ifcfg_range_file.write("IPADDR_END=\""+lastip+"\"\n")
        ifcfg_range_file.close()
    else:
        if os.path.isfile(config_range_file):
            os.unlink(config_range_file)
    
    ifcfg_file.close()
    print("Check results "+config_file+"\n\n")
    print("After you may reload network: \nifdown "+interface+" && ifup "+interface+"\n")