#!/bin/sh

# amavisd-cn    /etc/init.d/ initscript wrapper for CARNetized amavisd-new
#
# Start and stop Amavis, ClamAV and Postfix/Sendmail

### BEGIN INIT INFO
# Provides:          amavisd-cn
# Required-Start:    $local_fs $remote_fs $syslog $named $network $time
# Required-Stop:     $local_fs $remote_fs $syslog $named $network
# Should-Start:
# Should-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: start and stop Amavis, ClamAV and Postfix/Sendmail
# Description:       wrapper for starting/stopping MTA and related services
### END INIT INFO

set -e

# options for daemons:
# name	init.d/script		user	ps name for pgrep -f	pidfile, relative to /var/run	num-fds	last-fd-name
options='
clamd	clamav-daemon		clamav	/usr/sbin/clamd		clamav/clamd.pid		5	clamav.log
amavis	amavis.amavisd-new	amavis	amavisd \\(master\\)	amavis/amavisd.pid		5	socket
'
# note: pgrep -f takes a regexp, and this is shell expanded once, hence \\

start () {
  local daemon IFSOLD name script user psname pidfile num fdname
  daemon="$1"
  IFSOLD="$IFS"
  IFS="	" # tab
  read name script user psname pidfile num fdname <<-EOPTS
	$(echo "$options" | sed 's/		*/	/g' | grep ^$daemon)
	EOPTS
  IFS="$IFSOLD"
  /etc/init.d/$script start
  wait_for_fds "$daemon"
}

stop () {
  local daemon IFSOLD name script user psname pidfile num fdname
  daemon="$1"
  n=10
  IFSOLD="$IFS"
  IFS="	" # tab
  read name script user psname pidfile num fdname <<-EOPTS
	$(echo "$options" | sed 's/		*/	/g' | grep ^$daemon)
	EOPTS
  IFS="$IFSOLD"
  /etc/init.d/$script stop
  pkill -u $user -f "$psname" > /dev/null || true
  while pgrep -u $user -f "$psname" > /dev/null && [ "$n" -gt 0 ]
  do
    sleep 1
    n=$(($n-1))
  done
  pkill -9 -u $user -f "$psname" > /dev/null || true
  #pkill -9 -u $user -x "$daemon"
  if pgrep -u $user -f "$psname" > /dev/null; then  # still there?
    return 1
  fi
}

wait_for_fds () {
  # wait until process shows some I/O readiness :)
  local name IFSOLD num sleep maxtry script user psname pidfile fdname
  name="$1"
  [ -z "$name" ] && return 1
  IFSOLD="$IFS"
  IFS="	" # tab
  read name script user psname pidfile num fdname <<-EOPTS
	$(echo "$options" | sed 's/		*/	/g' | grep ^$name)
	EOPTS
  IFS="$IFSOLD"
  num=${num:-4}
  sleep=${sleep:-1}
  maxtry=${maxtry:-90}
  if [ -n "$pidfile" ]; then
    pidfile=/var/run/$pidfile
    findpid="[ -f $pidfile ] && cat $pidfile || true"
  else
    findpid="pgrep -u $user -f \"$psname\" -P 1 | head -1"
  fi

  # loop the loop the loop
  try=1
  while /bin/true
  do
    sleep $sleep                           # 1st, give it a chance to run
    pid=`eval $findpid`                    # 2nd: find it
    if [ ! -z "$pid" ]; then
	    count=`ls -1 /proc/$pid/fd 2>/dev/null| wc -l`    # 3rd: count all it's worth
	    [ "$count" -ge "$num" ] && ls -l /proc/$pid/fd | grep -q $fdname \
				    && return      # success -- release
    fi
    try=$(($try+1))
    [ "0$try" -ge "0$maxtry" ] && return 1 # no luck this time
  done
}

# if we're called as amavisd-cn or amavis with start argument,
# act like one; otherwise, pass the call down
case "$(basename $0)" in
  amavisd-cn)
	arg="i$1"
	;;
  amavis)
	if [ "$1" = start ]; then
		arg="i$1"
	else
		arg="$1"
	fi
	;;
  *)
	arg="$1"
	;;
esac

# If there's no diversion, play possum
[ -x /etc/init.d/amavis.amavisd-new ] || exit 0

mta=postfix

case "$arg" in
  start|stop|restart|reload|force-reload|debug)
	/etc/init.d/amavis.amavisd-new "$arg"
	;;

  istart)
	start clamd
	start amavis
    if [ -x "/etc/init.d/$mta" ]; then
            if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
                    invoke-rc.d $mta start
            else
                    /etc/init.d/$mta start
            fi
    fi
	;;

  istop)
    if [ -x "/etc/init.d/$mta" ]; then
            if [ -x "`which invoke-rc.d 2>/dev/null`" ]; then
                    invoke-rc.d $mta stop
            else
                    /etc/init.d/$mta stop
            fi
    fi
	stop amavis
	stop clamd
	;;

  irestart|ireload|iforce-reload)
        $0 stop
        sleep 2
        $0 start
        ;;

  *)
        echo "Usage: $0 {start|stop|restart|reload|force-reload}" >&2
        exit 1
        ;;
esac

exit 0