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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/
#
# This script can be disabled by defining DO_CABLETEST as "no"
# in /etc/default/network-test
#
#
# 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.
#
# Note that if you set ABORT_NO_LINK to 'yes' and the Ethernet interface
# does not have a link, the script will abort and ifupdown will *not*
# mark the interface as configured.
#
# 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
rc="/etc/default/network-test"
ETHTOOL=/sbin/ethtool
alt_et=/usr/sbin/ethtool
[ -x "$ETHTOOL" ] || [ ! -x "$alt_et" ] || ETHTOOL=$alt_et
MIITOOL=/sbin/mii-tool
IPTOOL=/sbin/ip
DO_SYSLOG=yes
ABORT_NO_LINK=no
# Read system configuration file
[ -r "$rc" ] && . "$rc"
# Check if the test is disabled by the administrator
if [ "$DO_CABLETEST" = "no" ]; then
exit 0
fi
if [ "$DO_SYSLOG" = yes ]; then
OUTPUT="logger -i -p daemon.err -s"
else
OUTPUT=echo
fi
# Set our locale environment, just in case any of the tools get translated
LC_ALL=C
export LC_ALL
check_status_miitool() {
local status=0
if $MIITOOL "$IFACE" 2>&1 | grep -q "no link" ; then
status=1
fi
return $status
}
check_status_ethtool() {
local status=0
local LINK="$($ETHTOOL "$IFACE" 2>&1 | grep "Link detected" 2>/dev/null || :)"
# 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
[ -n "$LINK" ] || return 1
if ! echo $LINK | grep -q "Link detected: yes" ; then
status=1
fi
return $status
}
check_status_iplink() {
local status=0
local info=""
[ -x "$IPTOOL" ] || return 0
info=$($IPTOOL link show "$IFACE" up 2>&1)
if [ -z "$info" ] ; then
status=1
fi
return $status
}
# Status check function for all types of interfaces
check_status () {
local status=0 myid=$(id -u)
$IPTOOL link show "$IFACE" >/dev/null 2>&1 || {
$OUTPUT "ERROR: Interface $IFACE does not seem to be present" \
"in the system"
return 0
}
check_status_iplink || status=$?
[ $status -eq 0 ] ||
$OUTPUT "WARNING: Initialising interface $IFACE which does" \
"not have a link"
return $status
}
# Status check function for Ethernet interfaces
check_ethernet_status() {
local status=0 myid=$(id -u)
$IPTOOL link show "$IFACE" >/dev/null 2>&1 || {
$OUTPUT "ERROR: Interface $IFACE does not seem to be present" \
"in the system"
return 0
}
# For Ethernet interfaces use ethtool if installed (preferable to mii-tool)
# If none are installed (or not running as root) we will test using
# 'ip link show'
if [ -x "$ETHTOOL" ] && [ $myid -eq 0 ]; then
check_status_ethtool || status=$?
elif [ -x "$MIITOOL" ] && [ $myid -eq 0 ]; then
check_status_miitool || status=$?
else
check_status_iplink || status=$?
fi
[ $status -eq 0 ] ||
$OUTPUT "WARNING: Initialising interface $IFACE which does" \
"not have a link"
return $status
}
# Status check function for Bond interfaces
check_bond_status() {
local status=1 inf slaves slave_iface
slaves="/sys/class/net/$IFACE/bonding/slaves"
[ -e "$slaves" ] || return 0
# Loop over the list of slaves
while read slave_ifaces; do
for inf in $slave_ifaces; do
# Use ":" command to silence slaves. Run in subshell to preserve IFACE
(OUTPUT=: IFACE="$inf" check_status); status=$?
# One functional slave will suffice
[ $status -ne 0 ] || return 0
done
done <$slaves
$OUTPUT "WARNING: Initialising bond $IFACE which does not have link" \
"on any slave"
return $status
}
[ "$IFACE" ] || {
$OUTPUT "ERROR: Variable IFACE not set in environment"
exit 1
}
# Check our IFACE name, run the status check depending on the type of interface
case $IFACE in
en* | eth*)
check_ethernet_status || [ "$ABORT_NO_LINK" != "yes" ] || exit 1
;;
bond*)
check_bond_status || [ "$ABORT_NO_LINK" != "yes" ] || exit 1
;;
lo*) ;; # It does not make sense to check loopback links
--all) ;; # We do not know how to handle this case (yet)
*)
check_status || [ "$ABORT_NO_LINK" != "yes" ] || exit 1
;;
esac
|
