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#!/bin/bash
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#
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# netconsole This loads the netconsole module with the configured parameters.
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#
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# chkconfig: - 11 89
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# description: Initializes network console logging
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# config: /etc/sysconfig/netconsole
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#
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# Copyright 2002 Red Hat, Inc.
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#
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# Based in part on a shell script by
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# Andreas Dilger <adilger@turbolinux.com> Sep 26, 2001
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PATH=/sbin:/usr/sbin:$PATH
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RETVAL=0
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SERVER_ADDRESS_RESOLUTION=
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# Check that networking is up.
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. /etc/sysconfig/network
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# Source function library.
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. /etc/rc.d/init.d/functions
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# Default values
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LOCALPORT=6666
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DEV=
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SYSLOGADDR=
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SYSLOGPORT=514
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SYSLOGMACADDR=
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kernel=$(uname -r | cut -d. -f1-2)
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usage ()
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{
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echo $"Usage: $0 {start|stop|status|restart|condrestart}" 1>&2
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RETVAL=2
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}
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print_address_info ()
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{
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local host=$1
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local route via target
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route=$(LANG=C ip -o route get to $host/32)
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[ -z "$DEV" ] && DEV=$(echo $route | sed "s|.* dev \([^ ]*\).*|\1|")
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echo "DEV=$DEV"
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echo "LOCALADDR=$(echo $route | sed "s|.* src \([^ ]*\).*|\1|")"
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if [[ $route == *" via "* ]] ; then
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via=$(echo $route | sed "s|.* via \([^ ]*\).*|\1|")
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target=$via
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else
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target=$host
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fi
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if [ -z "$SYSLOGMACADDR" ]; then
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arp=$(LANG=C /sbin/arping -f -c 1 -I $DEV $target 2>/dev/null | awk '/ reply from .*[.*]/ { print gensub(".* reply from .* \\[(.*)\\].*","\\1","G"); exit }')
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[ -n "$arp" ] && echo "SYSLOGMACADDR=$arp"
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fi
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}
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start ()
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{
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[ -f /etc/sysconfig/netconsole ] || exit 6
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. /etc/sysconfig/netconsole
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SYSLOGOPTS=
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# syslogd server, if any
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if [ -n "$SYSLOGADDR" ]; then
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# IPv6 regex also covers 4to6, zero-compressed, and link-local addresses with zone-index addresses.
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# It should also cover IPv4-embedded, IPv4-mapped, and IPv4-translated IPv6 addresses.
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# Taken from: http://stackoverflow.com/a/17871737/3481531
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IPv4_regex="^([0-9]{1,3}\.){3}[0-9]{1,3}$"
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IPv6_regex="^(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))$"
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if ! [[ "$SYSLOGADDR" =~ $IPv4_regex ]] && ! [[ "$SYSLOGADDR" =~ $IPv6_regex ]]; then
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# Use IPv4 by default:
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SYSLOGADDR="$(LANG=C getent ahostsv4 $SYSLOGADDR 2> /dev/null)"
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# Try IPv6 in case IPv4 resolution has failed:
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if [[ $? -eq 2 ]]; then
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SYSLOGADDR="$(LANG=C getent ahostsv6 $SYSLOGADDR 2> /dev/null)"
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fi
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if [[ $? -ne 0 ]]; then
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echo $"Unable to resolve IP address specified in /etc/sysconfig/netconsole" 1>&2
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exit 6
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fi
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SYSLOGADDR="$(echo "$SYSLOGADDR" | head -1 | cut --delimiter=' ' --fields=1)"
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fi
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fi
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if [ -z "$SYSLOGADDR" ] ; then
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echo $"Server address not specified in /etc/sysconfig/netconsole" 1>&2
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exit 6
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fi
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eval $(print_address_info $SYSLOGADDR)
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if [ -z "$SYSLOGMACADDR" ]; then
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echo $"netconsole: can't resolve MAC address of $SYSLOGADDR" 1>&2
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exit 1
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fi
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SYSLOGOPTS="netconsole=$LOCALPORT@$LOCALADDR/$DEV,$SYSLOGPORT@$SYSLOGADDR/$SYSLOGMACADDR "
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/usr/bin/logger -p daemon.info -t netconsole: inserting netconsole module with arguments \
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$SYSLOGOPTS
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if [ -n "$SYSLOGOPTS" ]; then
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action $"Initializing netconsole" modprobe netconsole \
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$SYSLOGOPTS
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[ "$?" != "0" ] && RETVAL=1
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fi
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touch /var/lock/subsys/netconsole
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}
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stop ()
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{
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if /sbin/lsmod | grep netconsole >/dev/null 2>&1 ; then
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action $"Disabling netconsole" rmmod netconsole;
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[ "$?" != "0" ] && RETVAL=1
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fi
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rm -f /var/lock/subsys/netconsole
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}
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status ()
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{
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if /sbin/lsmod | grep netconsole >/dev/null 2>&1 ; then
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echo $"netconsole module loaded"
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RETVAL=0
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else
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echo $"netconsole module not loaded"
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RETVAL=3
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fi
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}
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restart ()
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{
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stop
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start
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}
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condrestart ()
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{
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[ -e /var/lock/subsys/netconsole ] && restart
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}
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case "$1" in
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stop) stop ;;
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status) status ;;
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start|restart|reload|force-reload) restart ;;
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condrestart) condrestart ;;
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*) usage ;;
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esac
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exit $RETVAL
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