D.27. /etc/sysconfig/network-devices/services/ipv4-static

#!/bin/sh
########################################################################
# Begin $network_devices/services/ipv4-static
#
# Description : IPV4 Static Boot Script
#
# Authors     : Nathan Coulson - nathan@linuxfromscratch.org
#        Kevin P. Fleming - kpfleming@linuxfromscratch.org
#
# Version     : 00.00
#
# Notes       :
#
########################################################################

. /etc/sysconfig/rc 
. ${rc_functions} 
. ${IFCONFIG}

if [ -z "${IP}" ]; then
    boot_mesg "IP variable missing from ${IFCONFIG}, cannot continue." ${FAILURE}
    echo_failure
    exit 1
fi

if [ -z "${PREFIX}" -a -z "${PEER}" ]; then
    boot_mesg -n "PREFIX variable missing from ${IFCONFIG}," ${WARNING}
    boot_mesg " assuming 24."
    echo_warning
    PREFIX=24
    args="${args} ${IP}/${PREFIX}"
elif [ -n "${PREFIX}" -a -n "${PEER}" ]; then
    boot_mesg "PREFIX and PEER both specified in ${IFCONFIG}, cannot continue." ${FAILURE}
    echo_failure
    exit 1
elif [ -n "${PREFIX}" ]; then
    args="${args} ${IP}/${PREFIX}"
elif [ -n "${PEER}" ]; then
    args="${args} ${IP} peer ${PEER}"
fi

if [ -n "${BROADCAST}" ]; then
    args="${args} broadcast ${BROADCAST}"
fi

case "${2}" in
    up)
        boot_mesg "Adding IPv4 address ${IP} to the ${1} interface..."
        ip addr add ${args} dev ${1}
        evaluate_retval
    
        if [ -n "${GATEWAY}" ]; then
            if ip route | grep -q default; then
                boot_mesg "Gateway already setup; skipping." ${WARNING}
                echo_warning
            else
                boot_mesg "Setting up default gateway..."
                ip route add default via ${GATEWAY} dev ${1}
                evaluate_retval
             fi
        fi
    ;;
    
    down)
        if [ -n "${GATEWAY}" ];    then
            boot_mesg "Removing default gateway..."
            ip route del default
            evaluate_retval
        fi
    
        boot_mesg "Removing IPv4 address ${IP} from the ${1} interface..."
        ip addr del ${args} dev ${1}
        evaluate_retval
    ;;
    
    *)
        echo "Usage: ${0} [interface] {up|down}"
        exit 1
    ;;
esac

# End $network_devices/services/ipv4-static