#!/bin/bash
# 
# netconsole 	This loads the netconsole module with the configured parameters.
#
# chkconfig: - 50 50
# description: Initializes network console logging
# config: /etc/sysconfig/netconsole
#
### BEGIN INIT INFO
# Provides: netconsole
# Required-Start: $network
# Required-Stop: $network
# Short-Description: Initializes network console logging
# Description: By starting this service you allow a remote syslog daemon 
#              to record console output from this system.
### END INIT INFO

# Copyright 2002 Red Hat, Inc.
#
# Based in part on a shell script by
# Andreas Dilger <adilger@turbolinux.com>  Sep 26, 2001

PATH=/sbin:/usr/sbin:$PATH
RETVAL=0
SERVER_ADDRESS_RESOLUTION=

# Check that networking is up.
. /etc/sysconfig/network

# Source function library.
. /etc/rc.d/init.d/functions

# Default values
LOCALPORT=6666
DEV=

SYSLOGADDR=
SYSLOGPORT=514
SYSLOGMACADDR=

kernel=$(uname -r | cut -d. -f1-2)

usage ()
{
	gprintf "Usage: %s {start|stop|status|restart|condrestart}\n" $0 1>&2
	RETVAL=3
}

print_address_info ()
{
	local host=$1
	local route via target

	route=$(LANG=C ip -o route get to $host/32)
	
	[ -z "$DEV" ] && DEV=$(echo $route | sed "s|.* dev \([^ ]*\).*|\1|")
	echo "DEV=$DEV"
	echo "LOCALADDR=$(echo $route | sed "s|.* src \([^ ]*\).*|\1|")"
	if echo $route | grep -q " via " ; then
		via=$(echo $route | sed "s|.* via \([^ ]*\).*|\1|")
		target=$via
	else
		target=$host
	fi
	if [ -z "$SYSLOGMACADDR" ]; then
		arp=$(LANG=C /sbin/arping -c 1 -I $DEV $target 2>/dev/null | awk '/ reply from .*[.*]/ { print gensub(".* reply from .* \\[(.*)\\].*","\\1","G") }')
		[ -n "$arp" ] && echo "SYSLOGMACADDR=$arp"
	fi	
}	
	
start ()
{
	[ -f /etc/sysconfig/netconsole ] || exit 6
	. /etc/sysconfig/netconsole

	SYSLOGOPTS=
	# syslogd server, if any
	if [ -n "$SYSLOGADDR" ]; then
		MATCH="^([0-9]{1,3}\.){3}[0-9]{1,3}$"
		if ! [[ "$SYSLOGADDR" =~ $MATCH ]]; then
			SYSLOGADDR=$(LANG=C host $SYSLOGADDR 2>/dev/null | awk '/has address / { print $NF }')
		fi
	fi
	if [ -z "$SYSLOGADDR" ] ; then
		gprintf "Server address not specified in /etc/sysconfig/netconsole\n" 1>&2
		exit 6
	fi
	eval $(print_address_info $SYSLOGADDR)
	
	if [ -z "$SYSLOGMACADDR" ]; then
		gprintf "netconsole: can't resolve MAC address of %s\n" $SYSLOGADDR 1>&2
		exit 1
	fi

	SYSLOGOPTS="netconsole=$LOCALPORT@$LOCALADDR/$DEV,$SYSLOGPORT@$SYSLOGADDR/$SYSLOGMACADDR "

	/usr/bin/logger -p daemon.info -t netconsole: inserting netconsole module with arguments \
	$SYSLOGOPTS
	if [ -n "$SYSLOGOPTS" ]; then
		action "Initializing netconsole" modprobe netconsole \
			$SYSLOGOPTS
	fi
	touch /var/lock/subsys/netconsole
}

stop ()
{
	if /sbin/lsmod | grep netconsole >/dev/null 2>&1 ; then
	    action "Disabling netconsole" rmmod netconsole;
	fi

	rm -f /var/lock/subsys/netconsole
}

status ()
{
	if /sbin/lsmod | grep netconsole >/dev/null 2>&1 ; then
		gprintf "netconsole module loaded\n"
		RETVAL=0
	else
		gprintf "netconsole module not loaded\n"
		RETVAL=3
	fi
}


restart ()
{
	stop
	start
}

condrestart ()
{
	[ -e /var/lock/subsys/netconsole ] && restart
}


case "$1" in
    stop) stop ;;
    status) status ;;
    start|restart|reload) restart ;;
    condrestart) condrestart ;;
    *) usage ;;
esac

exit $RETVAL