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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: - 50 50
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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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		MATCH="^([0-9]{1,3}\.){3}[0-9]{1,3}$"
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		if ! [[ "$SYSLOGADDR" =~ $MATCH ]]; then
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			SYSLOGADDR=$(LANG=C host $SYSLOGADDR 2>/dev/null | awk '/has address / { print $NF }')
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		fi
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	fi
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	if [ -z "$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