#!/usr/sbin/sh

#
# Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
#

. /lib/svc/share/smf_include.sh

PKILL=/usr/bin/pkill
DEGRADE_STATE=false
TRANSITION_FILE=/etc/rsyslog.d/TRANSITIONED

function setup
{
	SVC_FMRI=svc:/system/system-log
	SYSLOG_FMRI=${SVC_FMRI}:syslog
	DEFAULT_FMRI=${SVC_FMRI}:default
	OLD_METHOD1="kill -HUP \`cat /var/run/syslog.pid\`"
	OLD_METHOD2="kill -HUP \`cat /system/volatile/syslog.pid\`"
	NEW_METHOD="/usr/sbin/svccfg -s $SVC_FMRI refresh"
	LOGADM_CONF=/etc/logadm.conf

	if [ ! -f /etc/rsyslog.conf ]; then
		echo "/etc/rsyslog.conf not found. Exiting."
		exit $SMF_EXIT_ERR_CONFIG
	fi

	if [ ! -f /usr/lib/rsyslog/rsyslogd ]; then
		echo "/usr/lib/rsyslog/rsyslogd not found. Exiting."
		exit $SMF_EXIT_ERR_CONFIG
	fi

	if [ ! -x /usr/lib/rsyslog/rsyslogd ]; then
		echo "/usr/lib/rsyslog/rsyslogd not executable. Exiting."
		exit $SMF_EXIT_ERR_CONFIG
	fi

	# remove once "system-log/default" has been renamed to "syslog" in ON
	default=$(/usr/bin/svcprop -c -p general/enabled $DEFAULT_FMRI 2> /dev/null)
	if [ "$default" = true ]; then
		echo "$DEFAULT_FMRI conflicts with this instance and must be disabled first. Exiting."
		exit $SMF_EXIT_ERR_CONFIG
	fi

	syslog=$(/usr/bin/svcprop -c -p general/enabled $SYSLOG_FMRI 2> /dev/null)
	if [ "$syslog" = true ]; then
		echo "$SYSLOG_FMRI conflicts with this instance and must be disabled first. Exiting."
		exit $SMF_EXIT_ERR_CONFIG
	fi

	if smf_is_globalzone; then
		#
		# Before [r]syslogd starts, save any messages from
		# previous crash dumps so that messages appear
		# in chronological order.
		#
        	# Need to be root to use savecore
		/usr/bin/savecore -m
		if [ -r /etc/dumpadm.conf ]; then
			. /etc/dumpadm.conf
			[ -n "$DUMPADM_DEVICE" -a \
			"$DUMPADM_DEVICE" != swap ] && \
			/usr/bin/savecore -m -f $DUMPADM_DEVICE
		fi
	fi
	if [ ! -f /var/adm/messages ]; then
		/usr/bin/cp /dev/null /var/adm/messages
		/usr/bin/chmod 0644 /var/adm/messages
	fi

	# Convert the old PID-file based post-command for logadm to an SMF-based one.
	TMP_CONF=$(/usr/bin/mktemp /tmp/logadm.conf.XXXXXX)
	/usr/bin/sed -e "s|$OLD_METHOD1|$NEW_METHOD|" \
    		-e "s|$OLD_METHOD2|$NEW_METHOD|" $LOGADM_CONF > $TMP_CONF
	/usr/bin/cmp -s $LOGADM_CONF $TMP_CONF
	if [ $? -eq 0 ]; then
		/usr/bin/rm $TMP_CONF
	else
		# In case the umask or group is odd.
		mode=$(/usr/bin/stat -c %a $LOGADM_CONF)
		owner_group=$(/usr/bin/stat -c %U:%G $LOGADM_CONF)
		/usr/bin/mv $TMP_CONF $LOGADM_CONF
		/usr/bin/chmod $mode $LOGADM_CONF
		/usr/bin/chown $owner_group $LOGADM_CONF
	fi
}

function check_update
{
	# only do one transition/degrade
	if [ -f $TRANSITION_FILE ]; then
		return 0
	fi

	# cksum's of /etc/rsyslog.conf
	RSYSLOG_CKSUM_1=3811874833	# s11.1, s11.2, s11.3
	RSYSLOG_CKSUM_2=53416708	# s12
	# cksum's of /etc/syslog.conf
	SYSLOG_CKSUM_1=681212404	# s11, s11.1
	SYSLOG_CKSUM_2=2956275192	# s11.2, s11.3, s12

	CKSUM_ETC_RSYSLOG=`/usr/bin/cksum /etc/rsyslog.conf`
	if [ $? -ne 0 ]; then
		# very abnormal state; bail out
		echo "cksum /etc/rsyslog.conf failed.  Exiting."
		exit $SMF_EXIT_ERR_CONFIG
	else
		CKSUM_ETC_RSYSLOG=`echo $CKSUM_ETC_RSYSLOG | /usr/bin/cut -d' ' -f1`
	fi

	CKSUM_ETC_SYSLOG=`/usr/bin/cksum /etc/syslog.conf`
	if [ $? -ne 0 ]; then
		# Don't care?  Let rsyslog come up normal.
		CKSUM_ETC_SYSLOG=$SYSLOG_CKSUM_2      # unmodified syslog.conf
	else
		CKSUM_ETC_SYSLOG=`echo $CKSUM_ETC_SYSLOG | /usr/bin/cut -d' ' -f1`
	fi

	# if /etc/rsyslog.conf has NOT been modified
	# AND
	# if /etc/syslog.conf has been modified
	# then there are customizations that may need migrating so
	# 	exit DEGRADED
	if ([ $CKSUM_ETC_RSYSLOG -eq $RSYSLOG_CKSUM_1 ] || \
	    [ $CKSUM_ETC_RSYSLOG -eq $RSYSLOG_CKSUM_2 ])  && \
	   ([ $CKSUM_ETC_SYSLOG  -ne $SYSLOG_CKSUM_1 ]  && \
	    [ $CKSUM_ETC_SYSLOG  -ne $SYSLOG_CKSUM_2 ]); then
		echo "WARNING:"
		echo "Bringing up rsyslog in a degraded state."
		echo "man rsyslogd"
		echo "And see NOTES for further instructions."
		DEGRADE_STATE=true
	fi
	# and don't transition/degrade again
	echo "#DO NOT REMOVE" > $TRANSITION_FILE
	echo "#Successful transition from syslog to rsyslog completed."\
		>> $TRANSITION_FILE
}

case "$1" in
'start')
	setup
	check_update

	/usr/lib/rsyslog/rsyslogd >/dev/msglog 2>&1
	if [ $? -ne 0 ]; then
		return 1
	fi
	;;

'stop')
	$PKILL -TERM -f /usr/lib/rsyslog/rsyslogd
	;;

'refresh')
	$PKILL -HUP -f /usr/lib/rsyslog/rsyslogd
	;;

*)
	echo "Usage: $0 { start | stop | refresh }"
	exit 1
	;;

esac

if [ ${DEGRADE_STATE} == true ]; then
	smf_method_exit ${SMF_EXIT_DEGRADED} rsyslog \
		"rsyslog.conf may need customizations"
fi
exit ${SMF_EXIT_OK}