python ip 地址转换
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (c) 2011 X.commerce, a business unit of eBay Inc.
# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
"""
from socket import inet_aton ,inet_ntoa
from struct import unpack , pack
import sys
import math
from nova import log as logging
from nova import flags
from nova import utils
LOG = logging.getLogger(__name__)
FLAGS = flags.FLAGS
def long2ip(ip):
""" long into ip str type """
return inet_ntoa(pack("!L", ip))
def num2masklen(n):
""" Computeing number size to masklen """
return 32 - int(math.log(n,2))
def ip2long(ip_addr):
""" Ip into long type """
return unpack("!L", inet_aton(ip_addr))[0]
def unsigned32(n):
return n & 0xffffffff
def masklen2maskbit(n):
""" Computing mask is int """
return unsigned32(~((1 << (32-n)) - 1))
def masklen2size(n):
""" Computing network bit : 1 << (32 - n )"""
return (1 << (32-n))
def load_used_ip_list():
subnet = dict()
cidrs = list()
cidrs = []#[u'172.122.0.0/29', u'172.122.0.8/29', u'172.122.0.32/28',u'172.122.0.48/28', u'172.122.0.240/28',u'172.122.1.240/28']
for net in cidrs:
ip_str = net.split('/')[0]
netBit = net.split('/')[1]
subnet[ip_str] = dict()
subnet[ip_str] = get_net_info(ip_str,int(netBit))
return subnet
def be_used(ip):
""" """
#for item in used_ip_list:
#used_ip_list = [{'net': 2893676544, 'bcast': 2893676799}]
#print net , used_net[net]
used_net = load_used_ip_list()
for net in used_net:
if ip >= used_net[net]['net'] and ip <= used_net[net]['bcast']:
return True
return False
def get_net_info(ip_str, masklen):
""" From openstack db read used cidr """
netInfo = dict()
netInfo['ip'] =ip2long(ip_str)
netInfo['maskbit'] = masklen2maskbit(masklen)
netInfo['size'] = masklen2size(masklen)
netInfo['net'] = netInfo['ip'] & netInfo['maskbit']
netInfo['bcast'] = netInfo['net'] + netInfo['size'] - 1
print netInfo
return netInfo
def work():
# Initializes the network range
big_ip_str = '172.122.0.0'
big_masklen = 16
big_ip = ip2long(big_ip_str)
big_maskbit = masklen2maskbit(big_masklen)
big_len = masklen2size(big_masklen)
big_net = big_ip & big_maskbit
big_bcast = big_net + big_len - 1
masklen = num2masklen(4)
ip = big_net
maskbit = masklen2maskbit(masklen)
n = masklen2size(masklen)
while(ip <= big_bcast):
net = ip & maskbit
bcast = net + n - 1
if be_used(net) or be_used(bcast):
ip = bcast + 1
print ""+long2ip(ip)+"---"+str(n)+"--"+long2ip(bcast)
continue
else:
#print "============++++++++++>"+long2ip(ip)+"/"+str(masklen)
return long2ip(ip)+"/"+str(masklen)
break
if __name__ == "__main__":
sc = work()
print sc ,'sc'