#####
# Simple shell script for Tunnel Broker IPv6
# Deployed for XX-WRT distributions
# Copyright (C) 2010 Adam Botbyl
# http://www.adambotbyl.com
#####

# TB_USERID is the HEX userid located in your TunnelBroker.net Home Page
# TB_PASSWORD is your plain-text password
# TB_TUNNEL_ID is the "Tunnel ID" ID of the tunnel located on the tunnels home page
# TB_SERVER_IP is the "Server IPv4 Address"
# TB_CLIENT_V6 is the "Client IPv6 Address"
# TUNNEL_IF is the name you'd like to use for the tunnel interface
# WAN_IF is the interface for your external IP address

TB_USERID=deadbeefcafedeadbeefcafedeadbeef
TB_PASSWORD=somepasshere
TB_TUNNEL_ID=11111
TB_SERVER_IP=216.218.224.42
TB_CLIENT_V6=2001:470:<CHANGE>:<ME>:2/64
TUNNEL_IF=tb-ipv6
WAN_IF=vlan2

## Begin processing....

# Convert password to MD5Sum
TB_PASSWORD=$(echo -n $TB_PASSWORD | md5sum | awk '// {print $1'});
# Fetch WAN IP Address
WAN_IP=$(ip -4 addr show dev $WAN_IF | awk '/inet / {print $2}' | cut -d/ -f1)
# If tunnel exists, get Tunnel's local address
TUNNEL_WAN_IP=$(ip tunnel show $TUNNEL_IF | awk '/'$TUNNEL_IF'/ {print $6}')
# Check IPTables to see if we have a allow for ICMP from TB (Needed for the update URL to work
IPTABLES_ICMP=$(iptables -nL|awk '/icmp --  66.220.2.74/ {print $1}')

start_tunnel () {
        if [ -z $IPTABLES_ICMP ]; then
                echo -n Allowing HE ICMP...
                iptables -I INPUT -s 66.220.2.74 -p icmp -j ACCEPT
        fi
        echo -n Updating TB Client V4...
        # For whatever reason DD-WRT did not support HTTPS in wget (!?!?), so we have to do this unencrypted
        if [ ! -z $(wget -q -O - "http://ipv4.tunnelbroker.net/ipv4_end.php?ipv4b=$WAN_IP&pass=$TB_PASSWORD&user_id=$TB_USERID&tunnel_id=$TB_TUNNEL_ID" | awk '/not valid/ {print $1}') ]; then
                echo -n TB User/Pass Invalid...
        fi
        echo -n Building...
        ip tunnel add $TUNNEL_IF mode sit remote $TB_SERVER_IP local $WAN_IP ttl 255
        ip link set $TUNNEL_IF up
        echo -n Addressing...
        ip -6 addr add $TB_CLIENT_V6 dev $TUNNEL_IF
        echo -n Routing...
        ip -6 route add ::/0 dev $TUNNEL_IF
        echo Done!
}

stop_tunnel ()  {
        echo -n Removing...
        ip tunnel del $TUNNEL_IF
}


echo -n HE IPv6...
if [ -n $WAN_IP ]; then
        if [ ! -z $TUNNEL_WAN_IP ]; then
                if [ $TUNNEL_WAN_IP != $WAN_IP ]; then
                        echo -n Restarting tunnel...
                        stop_tunnel
                        start_tunnel
                else
                        echo Already Established!
                fi
        else
                start_tunnel;
        fi
else
        echo No WAN IP...Abort!
fi