#!/bin/sh
#
# asterisk	start the asterisk PBX
# (c) Mark Purcell <msp@debian.org>
# (c) Tzafrir Cohen <tzafrir.cohen@xorcom.com>
# (c) Faidon Liambotis <paravoid@debian.org>
#
#   This package is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#
### BEGIN INIT INFO
# Provides:          asterisk
# Required-Start:    $remote_fs
# Required-Stop:     $remote_fs
# Should-Start:      $syslog $network $named mysql postgresql dahdi
# Should-Stop:       $syslog $network $named mysql postgresql
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Asterisk PBX
# Description:       Controls the Asterisk PBX
### END INIT INFO

PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
NAME=asterisk
USER=$NAME
GROUP=$USER
DAEMON=/usr/sbin/$NAME
CANARY=/usr/sbin/astcanary
DESC="Asterisk PBX"
PIDFILE="/var/run/asterisk/asterisk.pid"
ASTSAFE_PIDFILE="/var/run/asterisk/asterisk_safe.pid"
UMASK=007 # by default
#MAXFILES=1024 # (the system default)

. /lib/lsb/init-functions

# by default: use real-time priority
PARAMS=""
CHDIR_PARM=""
AST_REALTIME="yes"
RUNASTERISK="yes"
AST_DUMPCORE="no"
AST_DUMPCORE_DIR="/var/spool/asterisk" # only used if AST_DUMPCORE != no
# core_pattern. See: http://lxr.linux.no/source/Documentation/sysctl/kernel.txt
#CORE_PATTERN=
if [ -r /etc/default/$NAME ]; then . /etc/default/$NAME; fi

if [ "$RUNASTERISK" != "yes" ];then
	echo "Asterisk not yet configured. Edit /etc/default/asterisk first."
	exit 0
fi

if [ "$AST_REALTIME" != "no" ]
then
  PARAMS="$PARAMS -p"
fi

if [ "$AST_DUMPCORE" != "no" ]
then
	PARAMS="$PARAMS -g"
	if [ "$CORE_PATTERN" != '' ]
	then
		echo "$CORE_PATTERN" >/proc/sys/kernel/core_pattern
	fi
	if [ -d "$AST_DUMPCORE_DIR" ]
	then
		CHDIR_PARM="--chdir $AST_DUMPCORE_DIR"
	fi
fi

if [ "x$USER" = "x" ]
then
  echo "Error: empty USER name"
  exit 1
fi
if [ `id -u "$USER"` = 0 ]
then
  echo "Starting as root not supported."
  exit 1
fi
PARAMS="$PARAMS -U $USER"

if [ "x$AST_DEBUG_PARAMS" = x ] 
then
  AST_DEBUG_PARAMS=-cvvvvvddddd
fi
if [ "$RUNASTSAFE" = "yes" ];then
	# The value of WRAPPER_DAEMON in can be set in /etc/default/asterisk
	WRAPPER_DAEMON=${WRAPPER_DAEMON:-/usr/sbin/safe_asterisk}
	REALDAEMON="$WRAPPER_DAEMON"
else
	REALDAEMON="$DAEMON"
fi

test -x $DAEMON || exit 0

for dir in /var/run/asterisk /var/log/asterisk /var/log/asterisk/cdr-csv /var/log/asterisk/cdr-custom; do
	[ -d $dir ] || install -d -o $USER -g $GROUP $dir
done

set -e

if [ "$UMASK" != '' ]
then
	umask $UMASK
fi

# allow changing the per-process open files limit:
if [ "$MAXFILES" != '' ]
then
	ulimit -n $MAXFILES
fi

status() {
	status_of_proc "$DAEMON" "$DESC" && return 0 || return $?
}

asterisk_rx() {
	if ! status >/dev/null; then return 0; fi

	# if $HOME is set, asterisk -rx writes a .asterisk_history there
	(
		unset HOME
		$DAEMON -rx "$1"
	)
}

case "$1" in
  debug)
	# we add too many special parameters that I don't want to skip
	# accidentally. I'm afraid that skipping -U once may cause
	# confusing results. I also want to maintain the user's choice
	# of -p
	echo "Debugging $DESC: "
	$DAEMON $PARAMS $AST_DEBUG_PARAMS
	exit 0
	;;
  start)
	if status > /dev/null; then
		echo "$DESC is already running. Use restart."
		exit 0
	fi
	echo -n "Starting $DESC: "
	if [ "$RUNASTSAFE" != "yes" ];then
		# TODO: what if we cought the wrapper just as its asterisk
		# was killed? status should check for the wrapper if we're in
		# "safe mode"
		if status > /dev/null; then
			echo "$DESC is already running. Use restart."
			exit 0
		fi
		export SAFE_AST_BACKGROUND=1
		start-stop-daemon --start --group $GROUP --pidfile "$PIDFILE" \
			$CHDIR_PARM \
			--exec $REALDAEMON -- $PARAMS > /dev/null
	else
		start-stop-daemon --start --group $GROUP \
			--background --make-pidfile \
			$CHDIR_PARM --pidfile "$ASTSAFE_PIDFILE" \
			--exec $REALDAEMON -- $PARAMS
	fi
		
	
	echo "$NAME."
	;;
  stop)
	echo -n "Stopping $DESC: $NAME"
	# Try gracefully.
	# this may hang in some cases. Specifically, when the asterisk
	# processes is stopped. No bother to worry about cleanup: 
	# it will either fail or die when asterisk dies.
	( asterisk_rx 'core stop now' > /dev/null 2>&1 & ) &
	if [ "$RUNASTSAFE" = "yes" ];then
		start-stop-daemon --stop --quiet --oknodo \
				  --pidfile $ASTSAFE_PIDFILE
		rm -f $ASTSAFE_PIDFILE
	fi
	# just making sure it's really, really dead. 
	# KILL is necessary just in case there's an asterisk -r in the background
	start-stop-daemon --stop --quiet --oknodo --retry=0/2/TERM/2/KILL/5 --exec $DAEMON
	start-stop-daemon --stop --quiet --oknodo --retry=0/2/TERM/2/KILL/5 --exec $CANARY
	echo "."
	;;
  reload)
	echo "Reloading $DESC configuration files."
	asterisk_rx 'module reload'
	;;
  logger-reload)
	asterisk_rx 'logger reload'
	;;
  extensions-reload|dialplan-reload)
	echo "Reloading $DESC configuration files."
	asterisk_rx 'dialplan reload'
	;;
  restart-convenient)
	asterisk_rx 'core restart when convenient'
	;;
  restart|force-reload)
	$0 stop
	$0 start
	;;
  status)
	status
	exit $?
	;;
  *)
	N=/etc/init.d/$NAME
	echo "Usage: $N {start|stop|restart|reload|status|debug|logger-reload|extensions-reload|restart-convenient|force-reload}" >&2
	exit 1
	;;
esac

exit 0
