Internet status check for PPPoE on OpenBSD

inetstatus.sh

#!/bin/sh

INTERFACE=pppoe0
CACHEDIR=/var/cache/inetstatus
LASTSTATE=${CACHEDIR}/last

date=$( TZ=UTC date "+%Y-%m-%dT%H:%M:%SZ" )
eval $(
        ifconfig ${INTERFACE} \
        | sed -ne '/sid:/ { s/^.*PADI retries: \([0-9]*\) PADR retries: \([0-9]*\) *.*$/padi=\1 padr=\2/; p; }; /status:/ { s/^.*: \(.*\) *$/status="\1"/; p; }'
)

if [ -f "${LASTSTATE}" ]; then
        eval "$(< ${LASTSTATE} )"
else
        last_status=unknown
        last_date=1970-01-01T00:00:00Z
fi

if [ "${status}" != "${last_status}" ] || [ "${VERBOSE}" = 1 ]; then
        logger -t inetstatus daemon.notice "${INTERFACE} changed status ${last_status} (at ${last_date}) to ${status} (at ${date} PADI=${padi} PADR=${padr})"
        echo "${last_date}>${date} PADI=${padi} PADR=${padr} STATUS=\"${last_status}\">\"${status}\""
        echo "last_status=\"${status}\" last_date=\"${date}\"" > "${LASTSTATE}"
elif [ "${status}" = "no carrier" ]; then
        changed_ts=$( stat -f %m ${LASTSTATE} )
        now_ts=$( date +%s )
        delta=$(( ${now_ts} - ${changed_ts} ))
        if [ ${delta} -gt 3600 ]; then
                logger -t inetstatus daemon.notice "Rebooting due to prolonged outage"
                touch ${LASTSTATE}
                /usr/bin/uptime
                /sbin/reboot
        fi
fi