#!/bin/bash

function bru_add_bridge_7

{

  bridge=$1

  bridge_present=`brctl show | grep $bridge`

  if ! [ "$bridge_present" ]

    then

    brctl addbr $bridge 

    bridge_present=`brctl show | grep $bridge`

    if [ "$bridge_present" ]

    then

      ret_val=0

    else

      ret_val=1

    fi

  else

    ret_val=0

  fi

  echo $ret_val

}

function bru_add_bridge_8

{

  bridge=$1

  bridge_present=`cat /proc/net/dev | grep $bridge`

  if ! [ "$bridge_present" ]

  then

    ip link add name $bridge type bridge

    bridge_present=`cat /proc/net/dev | grep $bridge`

    if [ "$bridge_present" ]

    then

      ret_val=0

    else

      ret_val=1

    fi

  else

    ret_val=0

  fi

  echo $ret_val

}

function bru_del_bridge_7

{

  bridge=$1

  bridge_present=`brctl show | grep $bridge`

  if ! [ "$bridge_present" ]

  then

    ret_val=1

  else

    brctl delbr $bridge

    bridge_present=`brctl show | grep $bridge`

    if [ "$bridge_present" ]

    then

      ret_val=1

    else

      ret_val=0

    fi

  fi

  echo $ret_val

}

function bru_del_bridge_8

{

  bridge=$1

  bridge_present=`cat /proc/net/dev | grep $bridge`

  if ! [ "$bridge_present" ]

  then

    ret_val=1

  else

    ip link del name $bridge

    bridge_present=`cat /proc/net/dev | grep $bridge`

    if [ $bridge_present ]

    then

      ret_val=1

    else

      ret_val=0

    fi

  fi

  echo $ret_val

}

function bru_add_bridge

{

  if [ "$centos_ver" -ge 8 ] ; then

    bru_add_bridge_8 $1

  else

    bru_add_bridge_7 $1

  fi

}

function bru_del_bridge

{

  if [ "$centos_ver" -ge 8 ] ; then

    bru_del_bridge_8 $1

  else

    bru_del_bridge_7 $1

  fi

}