source: clfs-embedded/bootscripts/clfs/rc.d/init.d/network@ 18bce0c

#!/bin/ash
#
# Network interface(s) init script
#
# config: /etc/network.conf
#         /etc/network.d/interface.[devname]

. /etc/rc.d/init.d/functions
. /etc/network.conf

if [ "$NETWORKING" != "yes" ]; then
        echo "Networking is disabled in /etc/network.conf"
        exit 0
fi

case "$1" in
start)
        for i in /etc/network.d/interface.*
        do
                if [ -r "$i" ]; then
                        . $i
                        if [ "$DHCP" = "yes" ]; then
                                echo -n "Starting DHCP for interface $INTERFACE: "
                                # udhcpc is braindead, bring up interface first
                                ifconfig "$INTERFACE" up

                                # Bridging code requires some time to wake up
                                [ "$INTERFACE" = "br0" ] && sleep 5

                                udhcpc -b -i "$INTERFACE" -s /etc/udhcpc.conf \
                                        -p "/var/run/udhcpc.$INTERFACE.pid" \
                                        > /dev/null
                        else
                                echo -n "Setting up interface $INTERFACE: "
                                ifconfig "$INTERFACE" "$IPADDRESS" \
                                        netmask "$NETMASK" \
                                        broadcast "$BROADCAST" up
                        fi
                        check_status
                fi
        done
        
        if [ "$USE_GATEWAY" = "yes" -a -n "$GATEWAY" ]; then
                echo -n "Setting default route: "
                route add default gw $GATEWAY
                check_status
        fi
        ;;
stop)
        if [ "$USE_GATEWAY" = "yes" -a -n "$GATEWAY" ]; then
                echo -n "Removing default route: "
                route del -net 0.0.0.0
                check_status
        fi

        for i in /etc/network.d/interface.*
        do
                if [ -r "$i" ]; then
                        . $i
                        echo -n "Shutting down interface $INTERFACE: "
                        ifconfig $INTERFACE down
                        check_status
                        if [ "$DHCP" = "yes" ]; then
                                kill `cat "/var/run/udhcpc.$INTERFACE.pid"` 2>/dev/null || true
                                sleep 1
                        fi
                fi
        done
        ;;
restart)
        $0 stop
        $0 start
        ;;
status)
        ifconfig
        route
        ;;
*)
        echo "Usage: $0 {start|stop|restart|status}"
        exit 1
esac