#!/bin/sh
#
# pingcntl: echolot control + wrapper
# Written by admin@arancio.net, peter@palfrader.org
#
### BEGIN INIT INFO
# Provides:          echolot
# Required-Start:    $local_fs $remote_fs $time
# Required-Stop:     $local_fs $remote_fs
# Should-Start:      mail-transport-agent $syslog
# Should-Stop:       mail-transport-agent $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Pinger for anonymous remailers
# Description:       Echolot is a pinger for anonymous remailers
#                    such as Mixmaster.  As the name implies it
#                    regularly sends pings to remailers to
#                    collect performance statistics on each node.
### END INIT INFO

set -e

VERBOSE=0

# You probably don't want to mess with stuff below this line
################################################################

RUNDIR=/var/run/echolot
PIDFILE="$RUNDIR/pingd.pid"
CHECKULIMIT=1
CHECKUID=1
USER=echolot
GROUP=echolot
DAEMON=/usr/bin/pingd
DESC="Echolot Ping Daemon"
NAME="pingd"
test -f $DAEMON || exit 0

PATH=/bin:/usr/bin:/sbin:/usr/sbin
export PATH

# Reads config file (will override defaults above)
[ -r /etc/default/echolot ] && . /etc/default/echolot

if [ ! -d ${RUNDIR} ]; then
	mkdir "$RUNDIR"
	chown root:"$GROUP" "$RUNDIR"
	chmod 02770 "$RUNDIR"
fi

wait_for_deaddaemon () {
	PID=$1
	sleep 3
	if test -n "$PID"
	then
		if kill -0 $PID 2>/dev/null
		then
			echo -n "Waiting for pid $PID ."
			cnt=0
			while kill -0 $PID 2>/dev/null
			do
				cnt=`expr $cnt + 1`
				if [ $cnt -gt 30 ]
				then
					echo " Failed.. "
					exit 1
				fi
				sleep 2
				echo -n "."
			done
			rm -f $PIDFILE
		else
			rm -f $PIDFILE
		fi
	fi
}


# Check for evil ulimits
if [ "$CHECKULIMIT" -gt "0" ]; then
	FDs=`ulimit -n`
	HFDs=`ulimit -H -n`
	if [ "$FDs" -lt "512" ]; then
		if [ "$HFDs" -lt "512" ]; then
			echo "Hardlimit for open File Descriptors is less than 512." >&2
			echo "Please consider raising it." >&2
			if [ "$FDs" -lt "$HFDs" ]; then
				echo "Raising it to $HFDs" >&2
				ulimit -n $HFDs
			fi
		else
			if [ "$HFDs" -lt "1024" ]; then
				FDs=$HFDs
			else
				FDs=1024
			fi
			echo "Softlimit for open File Descriptors is less than 512." >&2
			echo "Raising it to $FDs" >&2
			ulimit -n $FDs
		fi
	fi
fi


# set VERBOSE
if [ $VERBOSE -gt 0 ]; then
	VERBOSE="--verbose"
else
	VERBOSE=""
fi


case $1 in

start)
	if [ -f $PIDFILE ] ; then
		PID=`cat $PIDFILE 2>/dev/null` || true
		if kill -0 $PID 2>/dev/null
		then
			echo "$DESC already running."
			exit 0
		else
			echo -n "Removing stale pid file: "
			rm -f $PIDFILE
			echo "$PIDFILE."
		fi
	fi
	if [ $RUN_ECHOLOT -gt 0 ]; then
		echo -n "Starting $DESC: "
		start-stop-daemon \
			--start \
			--quiet \
			--pidfile $PIDFILE \
			--chuid $USER:$GROUP \
			--exec $DAEMON -- --detach $VERBOSE --process --quiet start
		echo "$NAME."
	else
		echo "Not starting $DESC: disabled in configuration"
	fi
	;;

stop)
	echo -n "Stopping $DESC: "
	PID=`cat $PIDFILE 2>/dev/null` || true
	start-stop-daemon \
		--stop \
		--quiet \
		--oknodo \
		--pidfile $PIDFILE \
		--user $USER
	wait_for_deaddaemon $PID
	echo "$NAME."
	;;

reload|force-reload|restart)
	PID=`cat $PIDFILE 2>/dev/null` || true
	$0 stop
	wait_for_deaddaemon $PID
	$0 start
	;;
process|add|delete|set|setremailercaps|deleteremailercaps|getkeyconf|sendpings|sendchainpings|buildstats|buildkeys|buildthesaurus|buildfromlines|dumpconf|summary|enable|disable)
	# Check for right User
	if [ "$CHECKUID" -gt "0" ]; then
		CUID=`id -u`
		CUIDNAME=`id -nu`
		if [ "$CUIDNAME" = "$USER" ]; then
			"$DAEMON" "$@"
		elif [ "$CUID" = "0" ]; then
			command="$DAEMON"
			while [ "$#" -gt 0 ]; do
				command="$command \"$1\""
				shift
			done
			su "$USER" -c "$command"
		else
			echo "You are neither $USER nor root. Aborting." >&2
			exit 1;
		fi
	fi

	echo "Running $DESC: $NAME $1..."
	echo "done."
	;;
*)
	echo "Usage: $0 (start|stop|reload|force-reload|restart)" >&2
	echo "       $0 <COMMAND> [parameters]" >&2
	echo "See the pingd(1) manual page for valid commands" >&2
	exit 1
	;;
esac

exit 0

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