dhcp/56dhclient

#!/bin/sh
# If we are running dhclient, shutdown running instances cleanly and
# bring them back up on resume.

. "${PM_FUNCTIONS}"

PM_DHCLIENT_RUNDIR="${PM_UTILS_RUNDIR}/network"
PM_DHCLIENT_SUSPEND="${PM_DHCLIENT_RUNDIR}/dhclient.suspend"

suspend_dhclient() {
    [ ! -d /etc/sysconfig/network-scripts ] && return
    [ ! -x /sbin/ifdown ] && return

    [ ! -d ${PM_DHCLIENT_RUNDIR} ] && /bin/mkdir -p ${PM_DHCLIENT_RUNDIR}
    [ -f ${PM_DHCLIENT_SUSPEND} ] && /bin/rm -f ${PM_DHCLIENT_SUSPEND}

    cd /etc/sysconfig/network-scripts
    for ifcfg in ifcfg-* ; do
        # Clear relevant parameters set by previous interface
        # (lo doesn't set them)
        NM_CONTROLLED=
        BOOTPROTO=

        . ./${ifcfg}

        if [ "${NM_CONTROLLED}" = "no" ] || [ "${NM_CONTROLLED}" = "n" ] || [ "${NM_CONTROLLED}" = "false" ]; then
            if [ "${BOOTPROTO}" = "bootp" ] || [ "${BOOTPROTO}" = "dhcp" ] || [ -z "${BOOTPROTO}" ]; then
                # device is not NetworkManager controlled and uses dhcp,
                # now see if it's actually up at the moment
                /sbin/ip link show ${DEVICE} | /bin/grep -qE "state (UP|UNKNOWN)" >/dev/null 2>&1
                if [ $? -eq 0 ]; then
                    echo "${DEVICE}" >> ${PM_DHCLIENT_SUSPEND}
                    /sbin/ifdown ${DEVICE}
                fi
            fi
        fi
    done
}

resume_dhclient() {
    [ ! -f ${PM_DHCLIENT_SUSPEND} ] && return
    [ ! -x /sbin/ifup ] && return

    cd /etc/sysconfig/network-scripts
    while read device ; do
        /sbin/ifup ${device}
    done < ${PM_DHCLIENT_SUSPEND}

    /bin/rm -f ${PM_DHCLIENT_SUSPEND}
}

case "$1" in
    hibernate|suspend)
        suspend_dhclient
        ;;
    thaw|resume)
        resume_dhclient
        ;;
    *) exit $NA
        ;;
esac