#!/bin/bash
run_detect(){
    logger "check-LAN: running reconfig"
    cd /opt/schoolserver/iiab
    /opt/schoolserver/iiab/runtags network > /dev/null
    logger "check-LAN: completed reconfig"
    exit 0
}

exit_clean(){
    logger "check-LAN: completed - nothing to do"
    exit 0
}

logger "check-LAN: startup"

if [ -f /etc/sysconfig/xs_lan_device ]; then
    LAN_DEVICE=`cat /etc/sysconfig/xs_lan_device`
    if [ "x$LAN_DEVICE" = "x" ]; then
        logger "check-LAN: no lan expected"
        exit_clean
    else
        if [ "$LAN_DEVICE" = "br0" ]; then
            SLAVES=`egrep -rn BRIDGE=br0 /etc/sysconfig/network-scripts/ifcfg-* \
            | gawk -F'[-:]' '{print $3}'`
            SLAVE_COUNT=`egrep -rn BRIDGE=br0 /etc/sysconfig/network-scripts/ifcfg-* \
            | wc | awk '{print $1}'`

            logger "check-LAN: looking for $SLAVE_COUNT slaves"

            while [ "$SLAVE_COUNT" > 1 ]; do 
                TEST_SLAVE=`brctl show | tail -n $[ $SLAVE_COUNT - 1 ] | awk '{print $1}'`
                if [ "x$TEST_SLAVE" = "x" ]; then
                    logger "check-LAN: blank slave for number $SLAVE_COUNT"
                    run_detect
                else
                    logger "check-LAN: slave number $SLAVE_COUNT $TEST_SLAVE present"
                fi
                SLAVE_COUNT="$[ $SLAVE_COUNT - 1 ]"
                if [ "$SLAVE_COUNT" = 1 ]; then
                    TEST_SLAVE=`brctl show | grep br0 | awk '{print $4}'`
                    if [ "x$TEST_SLAVE" = "x" ]; then
                        logger "check-LAN: single blank slave for number $SLAVE_COUNT"
                        run_detect
                    else
                        logger "check-LAN: single slave number $SLAVE_COUNT $TEST_SLAVE present"
                        exit_clean
                    fi
                fi
            done
        fi
        LAN_IF=`ip -o addr | grep 172.18 | awk '{print $2}'`
        if [ "$LAN_IF" = "$LAN_DEVICE" ]; then
            logger "check-LAN: expected LAN matched $LAN_DEVICE"
            exit_clean
        fi
    fi
else
    logger "check-LAN: unconfigured"
    exit_clean
fi