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cloud-external-ipallocator.py

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#! /usr/bin/python3

# Licensed to the Apache Software Foundation (ASF) under one

# or more contributor license agreements. See the NOTICE file

# distributed with this work for additional information

# regarding copyright ownership. The ASF licenses this file

# to you 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.

import web

import socket, struct

import cloud_utils

from cloud_utils import Command

urls = ("/ipallocator", "ipallocator")

app = web.application(urls, globals())

augtool = Command("augtool")

service = Command("service")

class dhcp:

_instance = None

def __init__(self):

self.availIP=[]

self.router=None

self.netmask=None

self.initialized=False

options = augtool.match("/files/etc/dnsmasq.conf/dhcp-option").stdout.decode('utf-8').strip()

for option in options.splitlines():

if option.find("option:router") != -1:

self.router = option.split("=")[1].strip().split(",")[1]

print(self.router)

dhcp_range = augtool.get("/files/etc/dnsmasq.conf/dhcp-range").stdout.decode('utf-8').strip()

dhcp_start = dhcp_range.split("=")[1].strip().split(",")[0]

dhcp_end = dhcp_range.split("=")[1].strip().split(",")[1]

self.netmask = dhcp_range.split("=")[1].strip().split(",")[2]

print(dhcp_start, dhcp_end, self.netmask)

start_ip_num = self.ipToNum(dhcp_start);

end_ip_num = self.ipToNum(dhcp_end)

print(start_ip_num, end_ip_num)

for ip in range(start_ip_num, end_ip_num + 1):

self.availIP.append(ip)

print(self.availIP[0], self.availIP[len(self.availIP) - 1])

#load the ip already allocated

self.reloadAllocatedIP()

def ipToNum(self, ip):

return struct.unpack("!I", socket.inet_aton(ip))[0]

def numToIp(self, num):

return socket.inet_ntoa(struct.pack('!I', num))

def getFreeIP(self):

if len(self.availIP) > 0:

ip = self.numToIp(self.availIP[0])

self.availIP.remove(self.availIP[0])

return ip

else:

return None

def getNetmask(self):

return self.netmask

def getRouter(self):

return self.router

def getInstance():

if not dhcp._instance:

dhcp._instance = dhcp()

return dhcp._instance

getInstance = staticmethod(getInstance)

def reloadAllocatedIP(self):

dhcp_hosts = augtool.match("/files/etc/dnsmasq.conf/dhcp-host").stdout.decode('utf-8').strip().splitlines()

for host in dhcp_hosts:

if host.find("dhcp-host") != -1:

allocatedIP = self.ipToNum(host.split("=")[1].strip().split(",")[1])

if allocatedIP in self.availIP:

self.availIP.remove(allocatedIP)

def allocateIP(self, mac):

newIP = self.getFreeIP()

dhcp_host = augtool.match("/files/etc/dnsmasq.conf/dhcp-host").stdout.decode('utf-8').strip()

cnt = len(dhcp_host.splitlines()) + 1

script = """set %s %s

save"""%("/files/etc/dnsmasq.conf/dhcp-host[" + str(cnt) + "]", str(mac) + "," + newIP)

augtool < script

#reset dnsmasq

service("dnsmasq", "restart", stdout=None, stderr=None)

return newIP

def releaseIP(self, ip):

dhcp_host = augtool.match("/files/etc/dnsmasq.conf/dhcp-host").stdout.decode('utf-8').strip()

path = None

for host in dhcp_host.splitlines():

if host.find(ip) != -1:

path = host.split("=")[0].strip()

if path == None:

print("Can't find " + str(ip) + " in conf file")

return None

print(path)

script = """rm %s

save"""%(path)

augtool < script

self.availIP.remove(ip)

#reset dnsmasq

service("dnsmasq", "restart", stdout=None, stderr=None)

class ipallocator:

def GET(self):

try:

user_data = web.input()

command = user_data.command

print("Processing: " + command)

dhcpInit = dhcp.getInstance()

if command == "getIpAddr":

mac = user_data.mac

zone_id = user_data.dc

pod_id = user_data.pod

print(mac, zone_id, pod_id)

freeIP = dhcpInit.allocateIP(mac)

if not freeIP:

return "0,0,0"

print("Find an available IP: " + freeIP)

return freeIP + "," + dhcpInit.getNetmask() + "," + dhcpInit.getRouter()

elif command == "releaseIpAddr":

ip = user_data.ip

zone_id = user_data.dc

pod_id = user_data.pod

dhcpInit.releaseIP(ip)

except:

return None

if __name__ == "__main__":

app.run()