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Path: usr/sbin/

✏️ Editing: ifdown

#!/bin/bash
########################################################################
# Begin /sbin/ifdown
#
# Description : Interface Down
#
# Authors     : Nathan Coulson - nathan at linuxfromscratch.org
#               Kevin P. Fleming - kpfleming at linuxfromscratch.org
# Update      : Bruce Dubbs - bdubbs at linuxfromscratch.org
#               Joel Bion - jpbipv6hint at gmail.com
#
# Version     : LFS 9.0
#
# Notes       : the IFCONFIG variable is passed to the scripts found
#               in the /lib/services directory, to indicate what file the
#               service should source to get interface specifications.
#
########################################################################

RELEASE="9.0"

USAGE="Usage: $0 [ -hV ] [--help] [--version] interface"
VERSTR="LFS ifdown, version ${RELEASE}"

while [ $# -gt 0 ]; do
    case "$1" in
       --help | -h)     help="y"; break ;;

--version | -V)  echo "${VERSTR}"; exit 0 ;;

-*)              echo "ifdown: ${1}: invalid option" >&2
                        echo "${USAGE}" >& 2
                        exit 2 ;;

*)               break ;;
    esac
done

if [ -n "$help" ]; then
    echo "${VERSTR}"
    echo "${USAGE}"
    echo
    cat << HERE_EOF
ifdown is used to bring down a network interface.  The interface
parameter, e.g. eth0 or eth0:2, must match the trailing part of the
interface specifications file, e.g. /etc/sysconfig/ifconfig.eth0:2.

HERE_EOF
    exit 0
fi

file=/etc/sysconfig/ifconfig.${1}

# Skip backup files
[ "${file}" = "${file%""~""}" ] || exit 0

. /lib/lsb/init-functions

if [ ! -r "${file}" ]; then
    log_warning_msg "${file} is missing or cannot be accessed."
    exit 1
fi

. ${file}

if [ "$IFACE" = "" ]; then
    log_failure_msg "${file} does not define an interface [IFACE]."
    exit 1
fi

# We only need to first service to bring down the interface
S=`echo ${SERVICE} | cut -f1 -d" "`

if ip link show ${IFACE} > /dev/null 2<&1; then
    if [ -n "${S}" -a -x "/lib/services/${S}" ]; then
      IFCONFIG=${file} /lib/services/${S} ${IFACE} down
    else
      MSG="Unable to process ${file}.  Either "
      MSG="${MSG}the SERVICE variable was not set "
      MSG="${MSG}or the specified service cannot be executed."
      log_failure_msg "$MSG"
      exit 1
   fi
else
    log_warning_msg "Interface ${1} doesn't exist."
fi

# Leave the interface up if there are additional interfaces in the device
# However, for IPv6, we insist those adddresses must be global in scope,
# and not just one of the very many link-scope addresses IPv6 provides us.

link_status=`ip link show ${IFACE} 2>/dev/null`

# if [ -n "${link_status}" ]; then
#     if [ "$(echo "${link_status}" | grep UP)" != "" ]; then
#        if [ "$(ip addr show ${IFACE} | grep 'inet ')" == "" -a 
#             "$(ip addr show ${IFACE} | grep 'inet6 ' | 
#             grep 'scope global')" == "" ]; then
#           log_info_msg "Bringing down the ${IFACE} interface..."
#           ip link set ${IFACE} down
#           evaluate_retval
#        fi
#     fi
# fi
#
ip link set ${IFACE} down

# End /sbin/ifdown

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