lfs-book-zh_CN/bootscripts/lfs/lib/services/ipv4-static-route

#!/bin/sh
########################################################################
# Begin /lib/services/ipv4-static-route
#
# Description : IPV4 Static Route Script
#
# Authors     : Kevin P. Fleming - kpfleming@linuxfromscratch.org
#               DJ Lucas - dj@linuxfromscratch.org
# Update      : Bruce Dubbs - bdubbs@linuxfromscratch.org
#
# Version     : LFS 7.0
#
########################################################################

. /lib/lsb/init-functions
. ${IFCONFIG}

case "${TYPE}" in
   ("" | "network")
      need_ip=1
      need_gateway=1
   ;;

   ("default")
      need_gateway=1
      args="${args} default"
      desc="default"
   ;;

   ("host")
      need_ip=1
   ;;

   ("unreachable")
      need_ip=1
      args="${args} unreachable"
      desc="unreachable "
   ;;

   (*)
      log_failure_msg "Unknown route type (${TYPE}) in ${IFCONFIG}, cannot continue."
      exit 1
   ;;
esac

if [ -n "${need_ip}" ]; then
   if [ -z "${IP}" ]; then
      log_failure_msg "IP variable missing from ${IFCONFIG}, cannot continue."
      exit 1
   fi

   if [ -z "${PREFIX}" ]; then
      log_failure_msg "PREFIX variable missing from ${IFCONFIG}, cannot continue." 
      exit 1
   fi
   
   args="${args} ${IP}/${PREFIX}"
   desc="${desc}${IP}/${PREFIX}"
fi

if [ -n "${need_gateway}" ]; then
   if [ -z "${GATEWAY}" ]; then
      log_failure_msg "GATEWAY variable missing from ${IFCONFIG}, cannot continue."
      exit 1
   fi
   args="${args} via ${GATEWAY}"
fi

if [ -n "${SOURCE}" ]; then
        args="${args} src ${SOURCE}"
fi

case "${2}" in
   up)
      log_info_msg "Adding '${desc}' route to the ${1} interface..."
      ip route add ${args} dev ${1}
      evaluate_retval
   ;;
   
   down)
      log_info_msg "Removing '${desc}' route from the ${1} interface..."
      ip route del ${args} dev ${1}
      evaluate_retval
   ;;
   
   *)
      echo "Usage: ${0} [interface] {up|down}"
      exit 1
   ;;
esac

# End /lib/services/ipv4-static-route