#!/usr/bin/python

import sys
sys.path.append('..')
from mininet.topo import Topo
from mininet.net import Mininet
from mininet.cli import CLI
from mininet.log import setLogLevel
from mininet.node import RemoteController, OVSBridge, Host
from mininet.nodelib import NAT
from ipaddress import ip_network
from routinglib import BgpRouter
from routinglib import RoutedHost

class Trellis( Topo ):
    "Trellis basic topology"

    def __init__( self, *args, **kwargs ):
        Topo.__init__( self, *args, **kwargs )

        # Spines
        s226 = self.addSwitch('s226', dpid='226')
        s227 = self.addSwitch('s227', dpid='227')

        # Leaves
        s204 = self.addSwitch('s204', dpid='204')
        s205 = self.addSwitch('s205', dpid='205')

        # Switch Links
        self.addLink(s226, s204)
        self.addLink(s226, s205)
        self.addLink(s227, s204)
        self.addLink(s227, s205)

        # NOTE avoid using 10.0.1.0/24 which is the default subnet of quaggas
        # NOTE avoid using 00:00:00:00:00:xx which is the default mac of host behind upstream router
        # IPv4 Hosts
        h1 = self.addHost('h1', cls=DhcpClient, mac='00:aa:00:00:00:01')
        h2 = self.addHost('h2', cls=DhcpClient, mac='00:aa:00:00:00:02')
        h3 = self.addHost('h3', cls=DhcpClient, mac='00:aa:00:00:00:03')
        h4 = self.addHost('h4', cls=DhcpClient, mac='00:aa:00:00:00:04')
        self.addLink(h1, s204)
        self.addLink(h2, s204)
        self.addLink(h3, s205)
        self.addLink(h4, s205)

        # IPv6 Hosts
        h1v6 = self.addHost('h1v6', cls=RoutedHost, mac='00:bb:00:00:00:01', ips=['2000::201/120'], gateway='2000::2ff')
        h2v6 = self.addHost('h2v6', cls=RoutedHost, mac='00:bb:00:00:00:02', ips=['2000::202/120'], gateway='2000::2ff')
        h3v6 = self.addHost('h3v6', cls=RoutedHost, mac='00:bb:00:00:00:03', ips=['2000::301/120'], gateway='2000::3ff')
        h4v6 = self.addHost('h4v6', cls=RoutedHost, mac='00:bb:00:00:00:04', ips=['2000::302/120'], gateway='2000::3ff')
        self.addLink(h1v6, s204)
        self.addLink(h2v6, s204)
        self.addLink(h3v6, s205)
        self.addLink(h4v6, s205)

        # DHCP server
        dhcp = self.addHost('dhcp', cls=DhcpServer, mac='00:99:00:00:00:01', ips=['10.0.3.253/24'], gateway='10.0.3.254')
        self.addLink(dhcp, s205)

        # Control plane switch (for quagga fpm)
        cs0 = self.addSwitch('cs0', cls=OVSBridge)

        # Control plane NAT (for quagga fpm)
        nat = self.addHost('nat', cls=NAT,
                           ip='172.16.0.1/12',
                           subnet=str(ip_network(u'172.16.0.0/12')), inNamespace=False)
        self.addLink(cs0, nat)

        # Internal Quagga bgp1
        intfs = {'bgp1-eth0': {'ipAddrs': ['10.0.1.2/24', '2000::102/120'], 'mac': '00:88:00:00:00:02'},
                 'bgp1-eth1': {'ipAddrs': ['172.16.0.2/12']}}
        bgp1 = self.addHost('bgp1', cls=BgpRouter,
                            interfaces=intfs,
                            quaggaConfFile='./bgpdbgp1.conf',
                            zebraConfFile='./zebradbgp1.conf')
        self.addLink(bgp1, s205)
        self.addLink(bgp1, cs0)

        # External Quagga r1
        intfs = {'r1-eth0': {'ipAddrs': ['10.0.1.1/24', '2000::101/120'], 'mac': '00:88:00:00:00:01'},
                 'r1-eth1': {'ipAddrs': ['10.0.99.1/16']},
                 'r1-eth2': {'ipAddrs': ['2000::9901/120']}}
        r1 = self.addHost('r1', cls=BgpRouter,
                            interfaces=intfs,
                            quaggaConfFile='./bgpdr1.conf')
        self.addLink(r1, s205)

        # External IPv4 Host behind r1
        rh1 = self.addHost('rh1', cls=RoutedHost, ips=['10.0.99.2/24'], gateway='10.0.99.1')
        self.addLink(r1, rh1)

        # External IPv6 Host behind r1
        rh1v6 = self.addHost('rh1v6', cls=RoutedHost, ips=['2000::9902/120'], gateway='2000::9901')
        self.addLink(r1, rh1v6)

topos = { 'trellis' : Trellis }

class DhcpClient(Host):
    def __init__(self, name, *args, **kwargs):
        super(DhcpClient, self).__init__(name, **kwargs)
        self.pidFile = '/run/dhclient-%s.pid' % self.name

    def config(self, **kwargs):
        super(DhcpClient, self).config(**kwargs)
        self.cmd('ip addr flush dev %s' % self.defaultIntf())
        self.cmd('dhclient -q -4 -nw -pf %s %s' % (self.pidFile, self.defaultIntf()))

    def terminate(self, **kwargs):
        self.cmd('kill -9 `cat %s`' % self.pidFile)
        self.cmd('rm -rf %s' % self.pidFile)
        super(DhcpClient, self).terminate()

class DhcpServer(RoutedHost):
    binFile = '/usr/sbin/dhcpd'
    pidFile = '/run/dhcp-server/dhcpd.pid'
    configFile = './dhcpd.conf'

    def config(self, **kwargs):
        super(DhcpServer, self).config(**kwargs)
        self.cmd('%s -q -4 -pf %s -cf %s %s' % (self.binFile, self.pidFile, self.configFile, self.defaultIntf()))

    def terminate(self, **kwargs):
        self.cmd('kill -9 `cat %s`' % self.pidFile)
        self.cmd('rm -rf %s' % self.pidFile)
        super(DhcpServer, self).terminate()

if __name__ == "__main__":
    setLogLevel('debug')
    topo = Trellis()

    net = Mininet(topo=topo, controller=None)
    net.addController(RemoteController('c0', ip='192.168.56.11'))
    net.addController(RemoteController('c1', ip='192.168.56.12'))
    net.addController(RemoteController('c2', ip='192.168.56.13'))

    net.start()
    CLI(net)
    net.stop()