TestON/drivers/common/cli/quaggaclidriver.py

#!/usr/bin/env python

import time
import pexpect
import struct
import fcntl
import os
import sys
import signal
import sys
import re
import json
sys.path.append( "../" )
from drivers.common.clidriver import CLI


class QuaggaCliDriver( CLI ):

    def __init__( self ):
        super( CLI, self ).__init__()

    # TODO: simplify this method
    def connect( self, **connectargs ):
        for key in connectargs:
            vars( self )[ key ] = connectargs[ key ]
        self.name = self.options[ 'name' ]
        self.handle = super( QuaggaCliDriver, self ).connect(
                user_name=self.user_name,
                ip_address="127.0.0.1",
                port=self.port,
                pwd=self.pwd )
        if self.handle:
            return self.handle
        else:
            main.log.info( "NO HANDLE" )
            return main.FALSE
            

    def connectQuagga( self ):
        self.name = self.options[ 'name' ]
        # self.handle = super( QuaggaCliDriver,self ).connect(
        # user_name=self.user_name, ip_address=self.ip_address,port=self.port,
        # pwd=self.pwd )
        self.handle = super( QuaggaCliDriver, self ).connect(
                user_name=self.user_name,
                ip_address="1.1.1.1",
                port=self.port,
                pwd=self.pwd )
        main.log.info( "connect parameters:" + str( self.user_name ) + ";"
                       + str( self.ip_address ) + ";" + str( self.port )
                       + ";" + str(self.pwd ) )

        if self.handle:
            # self.handle.expect( "",timeout=10 )
            # self.handle.expect( "\$",timeout=10 )
            self.handle.sendline( "telnet localhost 2605" )
            # self.handle.expect( "Password:", timeout=5 )
            self.handle.expect( "Password:" )
            self.handle.sendline( "hello" )
            # self.handle.expect( "bgpd", timeout=5 )
            self.handle.expect( "bgpd" )
            self.handle.sendline( "enable" )
            # self.handle.expect( "bgpd#", timeout=5 )
            self.handle.expect( "bgpd#" )
            return self.handle
        else:
            main.log.info( "NO HANDLE" )
            return main.FALSE

    def loginQuagga( self, ip_address ):
        self.name = self.options[ 'name' ]
        self.handle = super( QuaggaCliDriver, self ).connect(
            user_name=self.user_name, ip_address=ip_address,
            port=self.port, pwd=self.pwd )
        main.log.info( "connect parameters:" + str( self.user_name ) + ";"
                       + str( self.ip_address ) + ";" + str( self.port )
                       + ";" + str( self.pwd ) )

        if self.handle:
            # self.handle.expect( "" )
            # self.handle.expect( "\$" )
            self.handle.sendline( "telnet localhost 2605" )
            # self.handle.expect( "Password:", timeout=5 )
            self.handle.expect( "Password:" )
            self.handle.sendline( "hello" )
            # self.handle.expect( "bgpd", timeout=5 )
            self.handle.expect( "bgpd" )
            self.handle.sendline( "enable" )
            # self.handle.expect( "bgpd#", timeout=5 )
            self.handle.expect( "bgpd#" )
            main.log.info( "I am in quagga on host " + str( ip_address ) )

            return self.handle
        else:
            main.log.info( "NO HANDLE" )
            return main.FALSE

    def enterConfig( self, asn ):
        main.log.info( "I am in enter_config method!" )
        try:
            self.handle.sendline( "" )
            self.handle.expect( "bgpd#" )
        except:
            main.log.warn( "Probably not currently in enable mode!" )
            self.disconnect()
            return main.FALSE
        self.handle.sendline( "configure terminal" )
        self.handle.expect( "config", timeout=5 )
        routerAS = "router bgp " + str( asn )
        try:
            self.handle.sendline( routerAS )
            self.handle.expect( "config-router", timeout=5 )
            return main.TRUE
        except:
            return main.FALSE

    def generatePrefixes( self, net, numRoutes ):
        main.log.info( "I am in generate_prefixes method!" )

        # each IP prefix is composed by "net" + "." + m + "." + n + "." + x
        # the length of each IP prefix is 24
        routes = []
        routesGen = 0
        m = numRoutes / 256
        n = numRoutes % 256

        for i in range( 0, m ):
            for j in range( 0, 256 ):
                network = str( net ) + "." + str( i ) + "." + str( j ) \
                    + ".0/24"
                routes.append( network )
                routesGen = routesGen + 1

        for j in range( 0, n ):
            network = str( net ) + "." + str( m ) + "." + str( j ) + ".0/24"
            routes.append( network )
            routesGen = routesGen + 1

        if routesGen == numRoutes:
            main.log.info( "Successfully generated " + str( numRoutes )
                           + " prefixes!" )
            return routes
        return main.FALSE

    # This method generates a multiple to single point intent(
    # MultiPointToSinglePointIntent ) for a given route
    def generateExpectedSingleRouteIntent( self, prefix, nextHop, nextHopMac,
                                           sdnipData ):

        ingresses = []
        egress = ""
        for peer in sdnipData[ 'bgpPeers' ]:
            if peer[ 'ipAddress' ] == nextHop:
                egress = "of:" + str(
                    peer[ 'attachmentDpid' ] ).replace( ":", "" ) + ":" \
                    + str( peer[ 'attachmentPort' ] )
        for peer in sdnipData[ 'bgpPeers' ]:
            if not peer[ 'ipAddress' ] == nextHop:
                ingress = "of:" + str(
                    peer[ 'attachmentDpid' ] ).replace( ":", "" ) + ":" \
                    + str( peer[ 'attachmentPort' ] )
                if not ingress == egress and ingress not in ingresses:
                    ingresses.append( ingress )
                    # ingresses.append( "of:" + str( peer[ 'attachmentDpid' ]
                    # ).replace( ":", "" ) + ":" + str( peer[ 'attachmentPort'
                    # ] ) )

        selector = "ETH_TYPE{ethType=800},IPV4_DST{ip=" + prefix + "}"
        treatment = "[ETH_DST{mac=" + str( nextHopMac ) + "}]"

        intent = egress + "/" + str( sorted( ingresses ) ) + "/" + \
            selector + "/" + treatment
        return intent

    def generateExpectedOnePeerRouteIntents( self, prefixes, nextHop,
                                             nextHopMac, sdnipJsonFilePath ):
        intents = []
        sdnipJsonFile = open( sdnipJsonFilePath ).read()

        sdnipData = json.loads( sdnipJsonFile )

        for prefix in prefixes:
            intents.append(
                self.generateExpectedSingleRouteIntent(
                    prefix, nextHop, nextHopMac, sdnipData ) )
        return sorted( intents )

    # TODO
    # This method generates all expected route intents for all BGP peers
    def generateExpectedRouteIntents( self ):
        intents = []
        return intents

    # This method extracts all actual routes from ONOS CLI
    def extractActualRoutes( self, getRoutesResult ):
        routesJsonObj = json.loads( getRoutesResult )

        allRoutesActual = []
        for route in routesJsonObj['routes4']:
            if 'prefix' in route:
                if route[ 'prefix' ] == '172.16.10.0/24':
                    continue
                allRoutesActual.append(
                    route[ 'prefix' ] + "/" + route[ 'nextHop' ] )

        return sorted( allRoutesActual )

    # This method extracts all actual route intents from ONOS CLI
    def extractActualRouteIntents( self, getIntentsResult ):
        intents = []
        # TODO: delete the line below when change to Mininet demo script
        # getIntentsResult=open( "../tests/SdnIpTest/intents.json" ).read()
        intentsJsonObj = json.loads( getIntentsResult )

        for intent in intentsJsonObj:
            if intent[ 'appId' ] != "org.onosproject.sdnip":
                continue
            if intent[ 'type' ] == "MultiPointToSinglePointIntent" \
            and intent[ 'state' ] == 'INSTALLED':
                egress = str( intent[ 'egress' ][ 'device' ] ) + ":" \
                    + str( intent[ 'egress' ][ 'port' ] )
                ingress = []
                for attachmentPoint in intent[ 'ingress' ]:
                    ingress.append(
                        str( attachmentPoint[ 'device' ] ) + ":"
                        + str( attachmentPoint[ 'port' ] ) )

                selector = intent[ 'selector' ].replace(
                    "[", "" ).replace( "]", "" ).replace( " ", "" )
                if str( selector ).startswith( "IPV4" ):
                    str1, str2 = str( selector ).split( "," )
                    selector = str2 + "," + str1

                intent = egress + "/" + str( sorted( ingress ) ) + "/" + \
                    selector + "/" + intent[ 'treatment' ]
                intents.append( intent )
        return sorted( intents )

    # This method extracts all actual BGP intents from ONOS CLI
    def extractActualBgpIntents( self, getIntentsResult ):
        intents = []
        # TODO: delete the line below when change to Mininet demo script
        # getIntentsResult=open( "../tests/SdnIpTest/intents.json" ).read()
        intentsJsonObj = json.loads( getIntentsResult )

        for intent in intentsJsonObj:
            if intent[ 'appId' ] != "org.onosproject.sdnip":
                continue
            if intent[ 'type' ] == "PointToPointIntent" \
            and "protocol=6" in str( intent[ 'selector' ] ):
                ingress = str( intent[ 'ingress' ][ 'device' ] ) + ":" \
                    + str( intent[ 'ingress' ][ 'port' ] )
                egress = str( intent[ 'egress' ][ 'device' ] ) + ":" + \
                    str( intent[ 'egress' ][ 'port' ] )
                selector = str( intent[ 'selector' ] ).replace( " ", "" )\
                    .replace( "[", "" ).replace( "]", "" ).split( "," )
                intent = ingress + "/" + egress + "/" + \
                    str( sorted( selector ) )
                intents.append( intent )

        return sorted( intents )

    # This method generates a single point to single point intent(
    # PointToPointIntent ) for BGP path
    def generateExpectedBgpIntents( self, sdnipJsonFilePath ):
        from operator import eq

        sdnipJsonFile = open( sdnipJsonFilePath ).read()
        sdnipData = json.loads( sdnipJsonFile )

        intents = []
        bgpPeerAttachmentPoint = ""
        bgpSpeakerAttachmentPoint = "of:" + str(
            sdnipData[ 'bgpSpeakers' ][ 0 ][ 'attachmentDpid' ] )\
            .replace( ":", "" ) + ":" \
            + str( sdnipData[ 'bgpSpeakers' ][ 0 ][ 'attachmentPort' ] )
        for peer in sdnipData[ 'bgpPeers' ]:
            bgpPeerAttachmentPoint = "of:" \
                + str( peer[ 'attachmentDpid' ] ).replace( ":", "" ) \
                + ":" + str( peer[ 'attachmentPort' ] )
            # find out the BGP speaker IP address for this BGP peer
            bgpSpeakerIpAddress = ""
            for interfaceAddress in \
            sdnipData[ 'bgpSpeakers' ][ 0 ][ 'interfaceAddresses' ]:
                # if eq( interfaceAddress[ 'interfaceDpid' ],sdnipData[
                # 'bgpSpeakers' ][ 0 ][ 'attachmentDpid' ] ) and eq(
                # interfaceAddress[ 'interfacePort' ], sdnipData[ 'bgpSpeakers'
                # ][ 0 ][ 'attachmentPort' ] ):
                if eq( interfaceAddress[ 'interfaceDpid' ],
                       peer[ 'attachmentDpid' ] ) \
                and eq( interfaceAddress[ 'interfacePort' ],
                        peer[ 'attachmentPort' ] ):
                    bgpSpeakerIpAddress = interfaceAddress[ 'ipAddress' ]
                    break
                else:
                    continue

            # from bgpSpeakerAttachmentPoint to bgpPeerAttachmentPoint
            # direction
            selectorStr = "IPV4_SRC{ip=" + bgpSpeakerIpAddress + "/32}," \
                + "IPV4_DST{ip=" + peer[ 'ipAddress' ] + "/32}," \
                + "IP_PROTO{protocol=6}, ETH_TYPE{ethType=800}, \
                TCP_DST{tcpPort=179}"
            selector = selectorStr.replace( " ", "" ).replace("[", "" )\
                .replace( "]", "" ).split( "," )
            intent = bgpSpeakerAttachmentPoint + "/" + \
                bgpPeerAttachmentPoint + "/" + str( sorted( selector ) )
            intents.append( intent )

            selectorStr = "IPV4_SRC{ip=" + bgpSpeakerIpAddress + "/32}," \
                + "IPV4_DST{ip=" + peer[ 'ipAddress' ] + "/32}," \
                + "IP_PROTO{protocol=6}, ETH_TYPE{ethType=800}, \
                TCP_SRC{tcpPort=179}"
            selector = selectorStr.replace( " ", "" ).replace("[", "" )\
                .replace( "]", "" ).split( "," )
            intent = bgpSpeakerAttachmentPoint + "/" \
                + bgpPeerAttachmentPoint + "/" + str( sorted( selector ) )
            intents.append( intent )

            # from bgpPeerAttachmentPoint to bgpSpeakerAttachmentPoint
            # direction
            selectorStr = "IPV4_SRC{ip=" + peer[ 'ipAddress' ] + "/32}," \
                + "IPV4_DST{ip=" + bgpSpeakerIpAddress + "/32}," \
                + "IP_PROTO{protocol=6}, ETH_TYPE{ethType=800}, \
                TCP_DST{tcpPort=179}"
            selector = selectorStr.replace( " ", "" ).replace("[", "" )\
                .replace( "]", "" ).split( "," )
            intent = bgpPeerAttachmentPoint + "/" \
                + bgpSpeakerAttachmentPoint + "/" + str( sorted( selector ) )
            intents.append( intent )

            selectorStr = "IPV4_SRC{ip=" + peer[ 'ipAddress' ] + "/32}," \
                + "IPV4_DST{ip=" + bgpSpeakerIpAddress + "/32}," \
                + "IP_PROTO{protocol=6}, ETH_TYPE{ethType=800}, \
                TCP_SRC{tcpPort=179}"
            selector = selectorStr.replace( " ", "" ).replace( "[", "" )\
                .replace( "]", "" ).split( "," )
            intent = bgpPeerAttachmentPoint + "/" \
                + bgpSpeakerAttachmentPoint + "/" + str( sorted( selector ) )
            intents.append( intent )

        return sorted( intents )

    def addRoutes( self, routes, routeRate ):
        main.log.info( "I am in add_routes method!" )

        routesAdded = 0
        try:
            self.handle.sendline( "" )
            # self.handle.expect( "config-router" )
            self.handle.expect( "config-router", timeout=5 )
        except:
            main.log.warn( "Probably not in config-router mode!" )
            self.disconnect()
        main.log.info( "Start to add routes" )

        for i in range( 0, len( routes ) ):
            routeCmd = "network " + routes[ i ]
            try:
                self.handle.sendline( routeCmd )
                self.handle.expect( "bgpd", timeout=5 )
            except:
                main.log.warn( "Failed to add route" )
                self.disconnect()
            # waitTimer = 1.00 / routeRate
            # time.sleep( waitTimer )
        if routesAdded == len( routes ):
            main.log.info( "Finished adding routes" )
            return main.TRUE
        return main.FALSE

    def deleteRoutes( self, routes, routeRate ):
        main.log.info( "I am in delete_routes method!" )

        routesAdded = 0
        try:
            self.handle.sendline( "" )
            # self.handle.expect( "config-router" )
            self.handle.expect( "config-router", timeout=5 )
        except:
            main.log.warn( "Probably not in config-router mode!" )
            self.disconnect()
        main.log.info( "Start to delete routes" )

        for i in range( 0, len( routes ) ):
            routeCmd = "no network " + routes[ i ]
            try:
                self.handle.sendline( routeCmd )
                self.handle.expect( "bgpd", timeout=5 )
            except:
                main.log.warn( "Failed to delete route" )
                self.disconnect()
            # waitTimer = 1.00 / routeRate
            # time.sleep( waitTimer )
        if routesAdded == len( routes ):
            main.log.info( "Finished deleting routes" )
            return main.TRUE
        return main.FALSE

    def pingTest( self, ip_address, pingTestFile, pingTestResultFile ):
        main.log.info( "Start the ping test on host:" + str( ip_address ) )

        self.name = self.options[ 'name' ]
        self.handle = super( QuaggaCliDriver, self ).connect(
            user_name=self.user_name, ip_address=ip_address,
            port=self.port, pwd=self.pwd )
        main.log.info( "connect parameters:" + str( self.user_name ) + ";"
                       + str( self.ip_address ) + ";" + str( self.port )
                       + ";" + str( self.pwd ) )

        if self.handle:
            # self.handle.expect( "" )
            # self.handle.expect( "\$" )
            main.log.info( "I in host " + str( ip_address ) )
            main.log.info( pingTestFile + " > " + pingTestResultFile + " &" )
            self.handle.sendline(
                pingTestFile +
                " > " +
                pingTestResultFile +
                " &" )
            self.handle.expect( "\$", timeout=60 )
            handle = self.handle.before

            return handle
        else:
            main.log.info( "NO HANDLE" )
            return main.FALSE

    def pingTestAndCheckAllPass( self, ip_address):
        main.log.info( "Start the ping test on host:" + str( ip_address ) )

        self.name = self.options[ 'name' ]
        self.handle = super( QuaggaCliDriver, self ).connect(
            user_name=self.user_name, ip_address=ip_address,
            port=self.port, pwd=self.pwd )
        main.log.info( "connect parameters:" + str( self.user_name ) + ";"
                       + str( self.ip_address ) + ";" + str( self.port )
                       + ";" + str( self.pwd ) )

        testPass = main.TRUE

        if self.handle:
            # self.handle.expect( "" )
            # self.handle.expect( "\$" )
            main.log.info( "I in host " + str( ip_address ) )
 
            # Ping to 3.0.x.1 is just for sanity check. It always succeeds.
            for m in range( 3, 6 ):
                for n in range( 1, 11 ):
                    hostIp = str( m ) + ".0." + str( n ) + ".1"
                    main.log.info( "Ping to " + hostIp )
                    try:
                        self.handle.sendline("ping -c 1 " + hostIp)
                        self.handle.expect( "64 bytes from", timeout=1 )
                    except:
                        main.log.warn("Ping error")
                        testPass = main.FALSE

            return testPass
        else:
            main.log.info( "NO HANDLE" )
            return main.FALSE

    def pingTestAndCheckAllFail( self, ip_address):
        main.log.info( "Start the ping test on host:" + str( ip_address ) )

        self.name = self.options[ 'name' ]
        self.handle = super( QuaggaCliDriver, self ).connect(
            user_name=self.user_name, ip_address=ip_address,
            port=self.port, pwd=self.pwd )
        main.log.info( "connect parameters:" + str( self.user_name ) + ";"
                       + str( self.ip_address ) + ";" + str( self.port )
                       + ";" + str( self.pwd ) )

        testPass = main.TRUE

        if self.handle:
            # self.handle.expect( "" )
            # self.handle.expect( "\$" )
            main.log.info( "I in host " + str( ip_address ) )

            for m in range( 4, 6 ):
                for n in range( 1, 11 ):
                    hostIp = str( m ) + ".0." + str( n ) + ".1"
                    main.log.info( "Ping to " + hostIp )
                    try:
                        self.handle.sendline("ping -c 1 " + hostIp)
                        self.handle.expect( "64 bytes from", timeout=1 )
                        testPass = main.FALSE
                    except:
                        main.log.warn("Ping error")

            return testPass
        else:
            main.log.info( "NO HANDLE" )
            return main.FALSE




    # Please use the generateRoutes plus addRoutes instead of this one!
    def addRoute( self, net, numRoutes, routeRate ):
        try:
            self.handle.sendline( "" )
            self.handle.expect( "config-router" )
        except:
            main.log.warn( "Probably not in config-router mode!" )
            self.disconnect()
        main.log.info( "Adding Routes" )
        j = 0
        k = 0
        while numRoutes > 255:
            numRoutes = numRoutes - 255
            j = j + 1
        k = numRoutes % 254
        routesAdded = 0
        if numRoutes > 255:
            numRoutes = 255
        for m in range( 1, j + 1 ):
            for n in range( 1, numRoutes + 1 ):
                network = str( net ) + "." + str( m ) + "." + str( n ) \
                    + ".0/24"
                routeCmd = "network " + network
                try:
                    self.handle.sendline( routeCmd )
                    self.handle.expect( "bgpd" )
                except:
                    main.log.warn( "failed to add route" )
                    self.disconnect()
                waitTimer = 1.00 / routeRate
                time.sleep( waitTimer )
                routesAdded = routesAdded + 1
        for d in range( j + 1, j + 2 ):
            for e in range( 1, k + 1 ):
                network = str( net ) + "." + str( d ) + "." + str( e ) \
                    + ".0/24"
                routeCmd = "network " + network
                try:
                    self.handle.sendline( routeCmd )
                    self.handle.expect( "bgpd" )
                except:
                    main.log.warn( "failed to add route" )
                    self.disconnect
                waitTimer = 1.00 / routeRate
                time.sleep( waitTimer )
                routesAdded = routesAdded + 1
        if routesAdded == numRoutes:
            return main.TRUE
        return main.FALSE
    
    # Please use deleteRoutes method instead of this one!
    def delRoute( self, net, numRoutes, routeRate ):
        try:
            self.handle.sendline( "" )
            self.handle.expect( "config-router" )
        except:
            main.log.warn( "Probably not in config-router mode!" )
            self.disconnect()
        main.log.info( "Deleting Routes" )
        j = 0
        k = 0
        while numRoutes > 255:
            numRoutes = numRoutes - 255
            j = j + 1
        k = numRoutes % 254
        routesDeleted = 0
        if numRoutes > 255:
            numRoutes = 255
        for m in range( 1, j + 1 ):
            for n in range( 1, numRoutes + 1 ):
                network = str( net ) + "." + str( m ) + "." + str( n ) \
                    + ".0/24"
                routeCmd = "no network " + network
                try:
                    self.handle.sendline( routeCmd )
                    self.handle.expect( "bgpd" )
                except:
                    main.log.warn( "Failed to delete route" )
                    self.disconnect()
                waitTimer = 1.00 / routeRate
                time.sleep( waitTimer )
                routesDeleted = routesDeleted + 1
        for d in range( j + 1, j + 2 ):
            for e in range( 1, k + 1 ):
                network = str( net ) + "." + str( d ) + "." + str( e ) \
                    + ".0/24"
                routeCmd = "no network " + network
                try:
                    self.handle.sendline( routeCmd )
                    self.handle.expect( "bgpd" )
                except:
                    main.log.warn( "Failed to delete route" )
                    self.disconnect()
                waitTimer = 1.00 / routeRate
                time.sleep( waitTimer )
                routesDeleted = routesDeleted + 1
        if routesDeleted == numRoutes:
            return main.TRUE
        return main.FALSE

    def checkRoutes( self, brand, ip, user, pw ):
        def pronto( ip, user, passwd ):
            print "Connecting to Pronto switch"
            child = pexpect.spawn( "telnet " + ip )
            i = child.expect( [ "login:", "CLI#", pexpect.TIMEOUT ] )
            if i == 0:
                print "user_name and password required. Passing login info."
                child.sendline( user )
                child.expect( "Password:" )
                child.sendline( passwd )
                child.expect( "CLI#" )
            print "Logged in, getting flowtable."
            child.sendline( "flowtable brief" )
            for t in range( 9 ):
                t2 = 9 - t
                print "\r" + str( t2 )
                sys.stdout.write( "\033[F" )
                time.sleep( 1 )
            print "Scanning flowtable"
            child.expect( "Flow table show" )
            count = 0
            while True:
                i = child.expect( [ '17\d\.\d{1,3}\.\d{1,3}\.\d{1,3}', 
                                   'CLI#', pexpect.TIMEOUT ] )
                if i == 0:
                    count = count + 1
                elif i == 1:
                    print "Pronto flows: " + str( count ) + "\nDone\n"
                    break
                else:
                    break

        def cisco( ip, user, passwd ):
            print "Establishing Cisco switch connection"
            child = pexpect.spawn( "ssh " + user + "@" + ip )
            i = child.expect( [ "Password:", "CLI#", pexpect.TIMEOUT ] )
            if i == 0:
                print "Password required. Passing now."
                child.sendline( passwd )
                child.expect( "#" )
            print "Logged in. Retrieving flow table then counting flows."
            child.sendline( "show openflow switch all flows all" )
            child.expect( "Logical Openflow Switch" )
            print "Flow table retrieved. Counting flows"
            count = 0
            while True:
                i = child.expect( [ "nw_src=17", "#", pexpect.TIMEOUT ] )
                if i == 0:
                    count = count + 1
                elif i == 1:
                    print "Cisco flows: " + str( count ) + "\nDone\n"
                    break
                else:
                    break
            if brand == "pronto" or brand == "PRONTO":
                pronto( ip, user, passwd )
            # elif brand  == "cisco" or brand == "CISCO":
            #    cisco( ip,user,passwd )

    def disable_bgp_peer( self, peer, peer_as ):
        main.log.info( "I am in disconnect_peer_session method!" )

        try:
            self.handle.sendline( "" )
            # self.handle.expect( "config-router" )
            self.handle.expect( "config-router", timeout=5 )
        except:
            main.log.warn( "Probably not in config-router mode!" )
            self.disconnect()
        main.log.info( "Start to disable peer" )

        cmd = "no neighbor " + peer + " remote-as " + peer_as
        try:
            self.handle.sendline( cmd )
            self.handle.expect( "bgpd", timeout=5 )
        except:
            main.log.warn( "Failed to disable peer" )
            self.disconnect()

    def enable_bgp_peer( self, peer, peer_as ):
        main.log.info( "I am in enable_bgp_peer method!" )

        try:
            self.handle.sendline( "" )
            # self.handle.expect( "config-router" )
            self.handle.expect( "config-router", timeout=5 )
        except:
            main.log.warn( "Probably not in config-router mode!" )
            self.disconnect()
        main.log.info( "Start to disable peer" )

        cmd = "neighbor " + peer + " remote-as " + peer_as
        try:
            self.handle.sendline( cmd )
            self.handle.expect( "bgpd", timeout=5 )
        except:
            main.log.warn( "Failed to enable peer" )
            self.disconnect()

    def disconnect( self ):
        """
        Called when Test is complete to disconnect the Quagga handle.
        """
        response = ''
        try:
            self.handle.close()
        except:
            main.log.error( "Connection failed to the host" )
            response = main.FALSE
        return response