#!/bin/sh 
###############################################################################
#                                                                             #
# S10bridge_tuntap                                                  R01-01.00 #
#                                                                             #
# =========================================================================== #
#                                                                             #
# Purpose:                                                                    #
#                                                                             #
#   This script is used to start and stop the network bridge devices.         #
#                                                                             #
# =========================================================================== #
#                                                                             #
# Arguments:                                                                  #
#                                                                             #
#   No arguments to the script                                                #
#                                                                             #
# =========================================================================== #
#                                                                             #
# Programming Notes:                                                          #
#                                                                             #
#   This script will invoke the rc.bridge_tuntap script with the start option #
# that is located in the rc.d directory.                                      #
#                                                                             #
#   This script was designed to be able to run with ash if needed.            #
#                                                                             #
# =========================================================================== #
#                                                                             #
# Revision:                                                                   #
#                                                                             #
# Revision   Who          When         Why                                    #
# =========  ===========  ===========  ====================================== #
# R00-00.00  DRLJr/I-AS   28/Apr/2014  Script created                         #
# R01-00.00  DRLJr/I-AS   02/May/2014  Find existing network route info.      #
# R01-01.00  DRLJr/I-AS   22/mar/2016  Add boot mode to turn bridge off.      #
#                                                                             #
###############################################################################

#=============================================================================#
#                                                                             #
#=============================================================================#

 get_field()
 {
   OFF=$1
   if [ ${OFF} -le $# ] ; then
      shift ${OFF}
      ANS="$1"
   else
      ANS=""
   fi
   echo "${ANS}"
   return 0
 }

#=============================================================================#
# Set the primary script to run if appropriate                                #
#=============================================================================#

 RC_CMD="/etc/rc.d/rc.bridge_tuntap"

#=============================================================================#
# Get the name used to invoke the script.  This will get the name of the link #
# if a link was called to invoke the script.                                  #
#=============================================================================#

 CALLEDAS="`basename $0`"

 CODES="${CALLEDAS##S}"
 CODEK="${CALLEDAS##K}"

#echo " "
#echo "Invoked  = $0 $*"
#echo "Arg0     = $0"
#echo "CALLEDAS = ${CALLEDAS}"
#echo "CODES    = ${CODES}"
#echo "CODEK    = ${CODEK}"
#echo " "

#=============================================================================#
# Determine if the command is a start or stop command.  If not called as      #
# Snnmmmm or Knnmmm then select "unknown", otherwise select "start" for the   #
# "S" command or "stop" for the "K" command.                                  #
#=============================================================================#

 if   [      "$1"        = ""            ] ; then
      if   [ "S${CODES}" = "${CALLEDAS}" ] ; then
           RC_OPT="start"
      elif [ "K${CODEK}" = "${CALLEDAS}" ] ; then
           RC_OPT="stop"
      else
           RC_OPT="unknown"
      fi
 else
           RC_OPT="$1"
 fi

#=============================================================================#
# Check if the file exists and execute it if it is executable                 #
#=============================================================================#

 if [ "${NETBRIDGE}" != "OFF" ] ; then                        # Do this
    if [ -f ${RC_CMD} ] ; then                                # Exists - yes
       if [ -x ${RC_CMD} ] ; then                             # Executable
          if [ "${RC_OPT}" = "start" ] ; then                 # Start Request?
             /sbin/modprobe tun                               # Activate tun.
          fi                                                  #
          DRINFO=`/bin/netstat -r -n | /bin/grep "^0.0.0.0"`  # Default Route
          DRADDR=`get_field 2 ${DRINFO}`                      # Get IP Address
          DRDEVC=`get_field 8 ${DRINFO}`                      # Get Device 
          ${RC_CMD} ${RC_OPT}                                 # Run Command
          NETDEV="`/sbin/ifconfig`"                           # Get Net info
          NETDEV="`echo ${NETDEV} | /bin/cut -d':' -f1`"      # Get Device
          /sbin/route add -net default gw ${DRADDR} ${NETDEV} # Setup Route
       fi                                                     # 
    else                                                      #
       echo "Warning: ${RC_CMD} does not exist."              #
    fi                                                        #
 fi                                                           #

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#                                                                             #
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