Hurricane electric IPv6 tunnel endpoint dynamic IP update script

updateTunnel.sh

#!/bin/sh

# INTERFACE ... Is the public interface to the internet with assigned public IP
# GIFIF ....... The generic routing encapsulating interface
# POPIP ....... IP address of your assigned point of presence (tunnel endpoint)
# STATEFILE ... File that keeps the current "old" IP address
# LOGFILE ..... Logfile into which updates will be written
# TID ......... Tunnel ID (see tunnel configuration page)
# USERID ...... User ID (as registered)
# UPDATEKEY ... See advanced tab of tunnel configuration page

INTERFACE=ng0
GIFIF=gif0
POPIP="216.66.80.98"
STATEFILE="/var/db/tunnelip.state"
LOGFILE="/var/log/tunnel.log"
TID="FILLIN_TUNNELIP"
USERID="FILLIN_USERID"
UPDATEKEY="FILLIN_UPDATEKEY"

getCurrentIpAddress()
{
        IPADDR=`ifconfig ${INTERFACE} | grep 'inet ' | cut -d ' ' -f 2 2> /dev/null`
        if [ $? -eq 0 ]; then
                # echo "IP Address ${IPADDR}" >> ${LOGFILE}
        else
                echo "Nonexisting Interface ${INTERFACE}, aborting" >> ${LOGFILE}
                exit 1
        fi
}

getTunnelIpAddress()
{
        TUNENDPOINTADDR=`ifconfig ${GIFIF} | grep 'tunnel inet' | cut -d ' ' -f 3 2> /dev/null`
        if [ $? -eq 0 ]; then
                # echo "Tunnel endpoint ${IPADDR}" >> ${LOGFILE}
        else
                echo "Nonexisting interface ${GIFIF}" >> ${LOGFILE}
                exit 1
        fi
}

getCurrentIpAddress
getTunnelIpAddress

if [ -e ${STATEFILE} ]; then
        OLDIP=`cat ${STATEFILE}`
else
        # Assign just anything invalid
        OLDIP="257.257.257.257"
fi


UPDATE=0
if [ "${OLDIP}" != "${IPADDR}" ]; then
        UPDATE=1
fi
if [ "${TUNENDPOINTADDR}" != "${IPADDR}" ]; then
        UPDATE=1
fi

if [ ${UPDATE} -gt 0 ]; then
        ifconfig ${GIFIF} tunnel ${IPADDR} ${POPIP}
        RES=`curl -s https://${USERID}:${UPDATEKEY}@ipv4.tunnelbroker.net/nic/update?hostname=${TID}`

        ERRORCNT=0
        if [ "${RES}" == "badauth" ]; then
                echo "Invalid credentials!" >> ${LOGFILE}
                ERRORCNT=1
        fi

        if [ ${ERRORCNT} -eq 0 ]; then
                echo "Update successful (response ${RES})" >> ${LOGFILE}
                echo ${IPADDR} > ${STATEFILE}
        else
                echo "Update failed, not updating database (response ${RES})" >> ${LOGFILE}
        fi
fi