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|
#!/bin/sh
# Check the link status of an ethernet interface
# This script should be installed in /etc/network/if-pre-up.d/
#
# You can use this script to solve bug #120382
# ('ifup should (optionally) check for link before configuring the interface.')
# if you configure ABORT_NO_LINK to 'yes' in /etc/default/network-test
# since this will make the script abort if the interface does not have
# any link.
#
# It can also be used as a standalone script by setting up
# its environment:
# IFACE=eth0 check-network-cable
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# You can also find a copy of the GNU General Public License at
# http://www.gnu.org/licenses/licenses.html#TOCLGPL
#
# Defaults
ETHTOOL=/usr/sbin/ethtool
MIITOOL=/sbin/mii-tool
DO_SYSLOG=yes
ABORT_NO_LINK=no
# Read system default file
[ -r /etc/default/network-test ] && . /etc/default/network-test
# Do not continue if ETHTOOL and MIITOOL is not available
[ ! -x "$ETHTOOL" ] && [ ! -x "$MIITOOL" ] && exit 0
if [ "$DO_SYSLOG" = "yes" ] ; then
OUTPUT="logger -i -p daemon.err -s"
else
OUTPUT="echo"
fi
# Set our locale environment, just in case ethtool gets translated
LC_ALL=C
export LC_ALL
check_status_miitool () {
status=0
if $MIITOOL $IFACE 2>&1| grep -q "no link"; then
status=1
fi
return $status
}
check_status_ethtool () {
status=0
LINK=`$ETHTOOL $IFACE 2>&1| grep "Link detected"`
# If ethtool fails to print out the link line we break off
# notice that ethtool cannot get the link status out of all
# possible network interfaces
[ -z "$LINK" ] && return
if ! echo $LINK | grep -q "Link detected: yes" ; then
status=1
fi
return $status
}
check_status_iplink () {
status=0
[ ! -x /sbin/ip ] && return 0
if /sbin/ip link show $IFACE 2>&1 | grep -q "NO-CARRIER"; then
status=1
fi
return $status
}
check_status() {
ifconfig $IFACE 2>/dev/null 1>&2
if [ $? -ne 0 ] ; then
$OUTPUT "ERROR: Interface $IFACE does not seem to be present in the system"
return
fi
status=0
# Use ethtool if installed (preferable to mii-tool)
# If none are installed we will test using 'ip link show'
if [ -x "$ETHTOOL" ] ; then
check_status_ethtool
status=$?
elif [ -x "$MIITOOL" ]; then
check_status_miitool
status=$?
else
check_status_iplink
status=$?
fi
if [ $status -ne 0 ] ; then
$OUTPUT "WARNING: Initialising interface $IFACE which does not have link"
fi
return $status
}
if [ -z "$IFACE" ] ; then
echo "ERROR: Variable IFACE not set in environment" >&2
exit 1
fi
# Check our IFACE name, if it does not start with eth, bail out
case "$IFACE" in
eth*)
check_status
if [ $? -ne 0 ] && [ "$ABORT_NO_LINK" = "yes" ] ; then
exit 1
fi
;;
*) ;;
esac
exit 0
|
