GraceMode autoddvpn update script for tomato firmware

update.sh

#!/bin/sh
#set -x

host='autoddvpn.googlecode.com'
cv_dir='/jffs/var/'
cv_file="${cv_dir}version.client"
vpnup_remote_path='http://autoddvpn.googlecode.com/svn/trunk/grace.d/vpnup.sh'
vpndown_remote_path='http://autoddvpn.googlecode.com/svn/trunk/grace.d/vpndown.sh'
vpnup_local_path='/jffs/openvpn/vpnup.sh'
vpndown_local_path='/jffs/openvpn/vpndown.sh'

get_server_version() {
        printf "HEAD /svn/trunk/grace.d/vpnup.sh  HTTP/1.0\nHost: $host\n\n"  | \
        nc $host 80 | \
        sed -n 's#^ETag: "\(.*\)//trunk/.*#\1#pg'
}

get_client_version() {
        if [ ! -d $cv_dir ]; then mkdir -p $cv_dir; fi
        if [ ! -e $cv_file ]; then
                cv=0
        else
                cv=$(head -n 1 $cv_file)
        fi
        echo $cv
}

update_vpnup() {
        echo "[INFO]vpnup.sh start updating"
        mv ${vpnup_local_path} ${vpnup_local_path}.old
        wget -q ${vpnup_remote_path} -O ${vpnup_local_path}
        sed -i "s/OPENVPNDEV='tun0'/OPENVPNDEV=\'$(ifconfig |grep tun | grep -Eo "tun([0-9.]+)" | cut -d: -f2)\'/g" ${vpnup_local_path}
        if [ "$(nvram show | grep wan_gateway_get | grep -o '[0-9.]*')" = "$(ip -4 addr show dev ppp0 | grep 'inet ' | awk '{print $4}' | cut -d/ -f1)" ]
        then
                echo "wan_gateway_get=$(nvram show | grep wan_gateway_get | grep -o '[0-9.]*')"
                echo "gateway ip=$(ip -4 addr show dev ppp0 | grep 'inet ' | awk '{print $4}' | cut -d/ -f1)"
                sed -i "s/wan_gateway/wan_gateway_get/g" ${vpnup_local_path}
        fi
        chmod a+x ${vpnup_local_path}
}

update_vpndown() {
        if [ ! -e $vpndown_local_path ]; then
        echo "[INFO]vpndown.sh start updating"
        wget -q ${vpndown_remote_path} -O ${vpndown_local_path}
        sed -i "s/OPENVPNDEV='tun0'/OPENVPNDEV=\'$(ifconfig |grep tun | grep -Eo "tun([0-9.]+)" | cut -d: -f2)\'/g" ${vpndown_local_path}
        sed -i "s/\/tun0\//\/$(ifconfig |grep tun | grep -Eo "tun([0-9.]+)" | cut -d: -f2)\//g" ${vpndown_local_path}
        if [ "$(nvram show | grep wan_gateway_get | grep -o '[0-9.]*')" = "$(ip -4 addr show dev ppp0 | grep 'inet ' | awk '{print $4}' | cut -d/ -f1)" ]
        then
                sed -i "s/wan_gateway/wan_gateway_get/g" ${vpndown_local_path}
        fi
        chmod a+x ${vpndown_local_path}
        fi
}

restart_openvpn() {
        kill -HUP $(pidof openvpn)
        return $?
}

sv=$(get_server_version)
cv=$(get_client_version)

if [ $sv -gt $cv ]; then
        echo "[INFO] need update(client version: $cv is lower than server verson: $sv)"
        update_vpnup
        update_vpndown
        if [ $? -eq 0 ]; then
                echo $sv > $cv_file
                                echo "[OK] update completed"
                restart_openvpn
                if [ $? -eq 0 ]; then
                        echo "[OK] OpenVPN restarting and refreshing the routing table now."
                        echo "[INFO] this may take a while to apply new rules"
                else
                        echo "[ERR] failed to restart the OpenVPN, you may need to reboot DDWRT"
                fi
        else
                echo "[ERR] update failed"
        fi
        
elif [ $sv -eq $cv ]; then
        echo "[INFO] already up-to-date"
else
        echo "[ERR] client version is newer than server version"
fi