create_dev

实现vpn网关用来建立 IP虚拟隧道

#!/bin/sh
#
#  Universal TUN/TAP device driver.
#  Copyright (C) 1999-2000 Maxim Krasnyansky <[e-mail]>
#
#  Create TUN and TAP devices in /dev
#
#  $Id: create_dev,v 1.2 2000/10/28 21:22:37 maxk Exp $
#

case $1 in
   2.2*)
	TUN_MAJOR=90

	TUN_MINOR=0
	TAP_MINOR=128
	#
	# TUN
	rm -f /dev/tun*
	for i in 0 1 2 3; do
  	   mknod /dev/tun$i c ${TUN_MAJOR} $i
	done  
	#
	# TAP
	rm -f /dev/tap*
	for i in 0 1 2 3; do
  	   mknod /dev/tap$i c ${TUN_MAJOR} `expr $i + ${TAP_MINOR}`
	done  
	;;

   2.4*)
	TUN_MAJOR=10
	TUN_MINOR=200

	if [ ! -d /dev/net ]; then
	   mkdir /dev/net
	fi
	rm -f /dev/net/tun
  	mknod /dev/net/tun c ${TUN_MAJOR} ${TUN_MINOR}
	;;

   *)
	echo "Unknown kernel version"
	;;
esac