BOOK/bootscripts/lfs/sbin/ifdown

   1 #!/bin/bash
   2 ########################################################################
   3 # Begin /sbin/ifdown
   4 #
   5 # Description : Interface Down
   6 #
   7 # Authors     : Nathan Coulson - nathan@linuxfromscratch.org
   8 #               Kevin P. Fleming - kpfleming@linuxfromscratch.org
   9 # Update      : Bruce Dubbs - bdubbs@linuxfromscratch.org
  10 #
  11 # Version     : LFS 7.0
  12 #
  13 # Notes       : the IFCONFIG variable is passed to the scripts found
  14 #               in the /lib/services directory, to indicate what file the
  15 #               service should source to get interface specifications.
  16 #
  17 ########################################################################
  18
  19 RELEASE="7.0"
  20
  21 USAGE="Usage: $0 [ -hV ] [--help] [--version] interface"
  22 VERSTR="LFS ifdown, version ${RELEASE}"
  23
  24 while [ $# -gt 0 ]; do
  25    case "$1" in
  26       --help | -h)     help="y"; break ;;
  27
  28       --version | -V)  echo "${VERSTR}"; exit 0 ;;
  29
  30       -*)              echo "ifup: ${1}: invalid option" >&2
  31                        echo "${USAGE}" >& 2
  32                        exit 2 ;;
  33
  34       *)               break ;;
  35    esac
  36 done
  37
  38 if [ -n "$help" ]; then
  39    echo "${VERSTR}"
  40    echo "${USAGE}"
  41    echo
  42    cat << HERE_EOF
  43 ifdown is used to bring down a network interface.  The interface
  44 parameter, e.g. eth0 or eth0:2, must match the trailing part of the
  45 interface specifications file, e.g. /etc/sysconfig/ifconfig.eth0:2.
  46
  47 HERE_EOF
  48    exit 0
  49 fi
  50
  51 file=/etc/sysconfig/ifconfig.${1}
  52
  53 # Skip backup files
  54 [ "${file}" = "${file%""~""}" ] || exit 0
  55
  56 . /lib/lsb/init-functions
  57
  58 if [ ! -r "${file}" ]; then
  59    log_warning_msg "${file} is missing or cannot be accessed."
  60    exit 1
  61 fi
  62
  63 . ${file}
  64
  65 if [ "$IFACE" = "" ]; then
  66    log_failure_msg "${file} does not define an interface [IFACE]."
  67    exit 1
  68 fi
  69
  70 # We only need to first service to bring down the interface
  71 S=`echo ${SERVICE} | cut -f1 -d" "`
  72
  73 if ip link show ${IFACE} > /dev/null 2>&1; then
  74    if [ -n "${S}" -a -x "/lib/services/${S}" ]; then
  75      IFCONFIG=${file} /lib/services/${S} ${IFACE} down
  76    else
  77      MSG="Unable to process ${file}.  Either "
  78      MSG="${MSG}the SERVICE variable was not set "
  79      MSG="${MSG}or the specified service cannot be executed."
  80      log_failure_msg "$MSG"
  81      exit 1
  82   fi
  83 else
  84    log_warning_msg "Interface ${1} doesn't exist."
  85 fi
  86
  87 # Leave the interface up if there are additional interfaces in the device
  88 link_status=`ip link show ${IFACE} 2>/dev/null`
  89
  90 if [ -n "${link_status}" ]; then
  91    if [ "$(echo "${link_status}" | grep UP)" != "" ]; then
  92       if [ "$(ip addr show ${IFACE} | grep 'inet ')" == ""  ]; then
  93          log_info_msg "Bringing down the ${IFACE} interface..."
  94          ip link set ${IFACE} down
  95          evaluate_retval
  96       fi
  97    fi
  98 fi
  99
 100 # End /sbin/ifdown