vpnc-script for OS X

vpn-script-osx

#!/bin/sh
#
# Originally part of vpnc source code:
# © 2005-2012 Maurice Massar, Jörg Mayer, Antonio Borneo et al.
# © 2009-2012 David Woodhouse <dwmw2@infradead.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#
################
#
# List of parameters passed through environment
#* reason                       -- why this script was called, one of: pre-init connect disconnect reconnect
#* VPNGATEWAY                   -- vpn gateway address (always present)
#* TUNDEV                       -- tunnel device (always present)
#* INTERNAL_IP4_ADDRESS         -- address (always present)
#* INTERNAL_IP4_MTU             -- mtu (often unset)
#* INTERNAL_IP4_NETMASK         -- netmask (often unset)
#* INTERNAL_IP4_NETMASKLEN      -- netmask length (often unset)
#* INTERNAL_IP4_NETADDR         -- address of network (only present if netmask is set)
#* INTERNAL_IP4_DNS             -- list of dns servers
#* INTERNAL_IP4_NBNS            -- list of wins servers
#* INTERNAL_IP6_ADDRESS         -- IPv6 address
#* INTERNAL_IP6_NETMASK         -- IPv6 netmask
#* INTERNAL_IP6_DNS             -- IPv6 list of dns servers
#* CISCO_DEF_DOMAIN             -- default domain name
#* CISCO_BANNER                 -- banner from server
#* CISCO_SPLIT_INC              -- number of networks in split-network-list
#* CISCO_SPLIT_INC_%d_ADDR      -- network address
#* CISCO_SPLIT_INC_%d_MASK      -- subnet mask (for example: 255.255.255.0)
#* CISCO_SPLIT_INC_%d_MASKLEN   -- subnet masklen (for example: 24)
#* CISCO_SPLIT_INC_%d_PROTOCOL  -- protocol (often just 0)
#* CISCO_SPLIT_INC_%d_SPORT     -- source port (often just 0)
#* CISCO_SPLIT_INC_%d_DPORT     -- destination port (often just 0)
#* CISCO_IPV6_SPLIT_INC         -- number of networks in IPv6 split-network-list
#* CISCO_IPV6_SPLIT_INC_%d_ADDR -- IPv6 network address
#* CISCO_IPV6_SPLIT_INC_$%d_MASKLEN -- IPv6 subnet masklen
if [ -z "$reason" ]; then
	echo "this script must be called from vpnc" 1>&2
	exit 1
fi

case "$reason" in
	pre-init)
		echo "PRE_INIT MARKER ***********************************"
		route -n delete -host "$VPNGATEWAY"
		;;
	connect)
		echo "CONNECT MARKER ***********************************"
		route -n delete -host "$VPNGATEWAY"
		ifconfig "$TUNDEV" inet "$INTERNAL_IP4_ADDRESS" "$INTERNAL_IP4_ADDRESS" netmask 255.255.255.255 mtu ${INTERNAL_IP4_MTU} up
		route add -host "$VPNGATEWAY" "`netstat -nr -f inet | grep UHLWIi | xargs | cut -d " " -f 1`"
		route add -net 128.0.0.0 "$INTERNAL_IP4_ADDRESS" -netmask 128.0.0.0
                route add -net 0.0.0.0 "$INTERNAL_IP4_ADDRESS" -netmask 128.0.0.0
         #	route add -net "$INTERNAL_IP4_ADDRESS" "$INTERNAL_IP4_ADDRESS"
               route add -net "$INTERNAL_IP4_NETADDR"/24 "$INTERNAL_IP4_ADDRESS"
		networksetup -setdnsservers Wi-Fi $INTERNAL_IP4_DNS
		;;
	disconnect)
		echo "DISCONNECT MARKER ***********************************"
		route delete -host "$VPNGATEWAY"
		route delete -net 128.0.0.0/1
		route delete -net 0.0.0.0/1
	#	route delete "$INTERNAL_IP4_ADDRESS"
		route delete "$INTERNAL_IP4_NETADDR"/24
		networksetup -setdnsservers Wi-Fi empty
		;;
	reconnect)
		echo "RECONNECT MARKER ***********************************"
#		route -n delete -host "$VPNGATEWAY"
		;;
	*)
		echo "unknown reason '$reason'. Maybe vpnc-script is out of date" 1>&2
		exit 1
		;;
esac

exit 0