#!/bin/sh
#
# Generic start/stop script for MIMEDefang.  Should work on most
# flavors of UNIX.

unset HOME
RETVAL=0
prog='mimedefang'
SPOOLDIR='/var/spool/MIMEDefang'
PID="$SPOOLDIR/$prog.pid"
MXPID="$SPOOLDIR/$prog-multiplexor.pid"

# Is the program executable?  We search in /usr/bin and /usr/local/bin.

if [ -x /usr/bin/$prog ] ; then
    PROGDIR=/usr/bin
elif [ -x /usr/bin/$prog ] ; then
    PROGDIR=/usr/bin
elif [ -x /usr/local/bin/$prog ] ; then
    PROGDIR=/usr/local/bin
else
    exit 0
fi

# Locale should be set to "C" for generating valid date headers
LC_ALL=C
export LC_ALL

# The settings which follow are defaults.  You can override them by
# placing assignments in /etc/mail/mimedefang.conf

# The socket used by mimedefang to communicate with sendmail
# SOCKET=$SPOOLDIR/mimedefang.sock

# Run the multiplexor and filters as this user, not root.  RECOMMENDED
MX_USER=defang

# Syslog facility
# SYSLOG_FACILITY=mail

# If you want to keep spool directories around if the filter fails,
# set the next one to yes
# KEEP_FAILED_DIRECTORIES=no

# "yes" turns on the multiplexor relay checking function
# MX_RELAY_CHECK=no

# "yes" turns on the multiplexor HELO checking function
# MX_HELO_CHECK=no

# "yes" turns on the multiplexor sender checking function
# MX_SENDER_CHECK=no

# "yes" turns on the multiplexor recipient checking function
# MX_RECIPIENT_CHECK=no

# Set to yes if you want the multiplexor to log events to syslog
MX_LOG=yes

# Set to yes if you want to use an embedded Perl interpreter
# MX_EMBED_PERL=yes

# Set to full path of socket for Sendmail's SOCKETMAP map, if you
# want to use it with MIMEDefang
# MX_MAP_SOCKET=$SPOOLDIR/map.sock

# The multiplexor does not start all slaves at the same time.  Instead,
# it starts one slave every MX_SLAVE_DELAY seconds when the system is idle.
# (If the system is busy, the multiplexor starts slaves as incoming mail
# requires attention.)
# MX_SLAVE_DELAY=3

# The next setting is an absolute limit on slave activation.  The multiplexor
# will NEVER activate a slave within MX_MIN_SLAVE_DELAY seconds of another.
# The default of zero means that the multiplexor will activate slaves as
# quickly as necessary to keep up with incoming mail.
# MX_MIN_SLAVE_DELAY=0

# Set to yes if you want the multiplexor to log stats in
# /var/log/mimedefang/stats  The /var/log/mimedefang directory must
# exist and be writable by the user you're running MIMEDefang as.
# MX_STATS=no

# Number of slaves reserved for connections from loopback.  Use -1
# for default behaviour, 0 to allow loopback connections to queue,
# or >0 to reserve slaves for loopback connections
LOOPBACK_RESERVED_CONNECTIONS=-1

# Set to yes if you want the stats file flushed after each entry
# MX_FLUSH_STATS=no

# Set to yes if you want the multiplexor to log stats to syslog
# MX_STATS_SYSLOG=no

# The socket used by the multiplexor
# MX_SOCKET=$SPOOLDIR/mimedefang-multiplexor.sock

# Maximum # of requests a process handles
# MX_REQUESTS=200

# Minimum number of processes to keep.  The default of 0 is probably
# too low; we suggest 2 instead.
MX_MINIMUM=2

# Maximum number of processes to run (mail received while this many
# processes are running is rejected with a temporary failure, so be
# wary of how many emails you receive at a time).  This applies only
# if you DO use the multiplexor.  The default value of 2 is probably
# too low; we suggest 10 instead
MX_MAXIMUM=10

# Uncomment to log slave status; it will be logged every
# MX_LOG_SLAVE_STATUS_INTERVAL seconds
# MX_LOG_SLAVE_STATUS_INTERVAL=30

# Uncomment next line to have busy slaves send status updates to the
# multiplexor.  NOTE: Consumes one extra file descriptor per slave, plus
# a bit of CPU time.
# MX_STATUS_UPDATES=yes

# Limit slave processes' resident-set size to this many kilobytes.  Default
# is unlimited.
# MX_MAX_RSS=10000

# Limit total size of slave processes' memory space to this many kilobytes.
# Default is unlimited.
# MX_MAX_AS=30000

# If you want to use the "notification" facility, set the appropriate port.
# See the mimedefang-notify man page for details.
# MX_NOTIFIER=inet:4567

# Number of seconds a process should be idle before checking for
# minimum number and killed
# MX_IDLE=300

# Number of seconds a process is allowed to scan an email before it is
# considered dead.  The default is 30 seconds; we suggest 600.
MX_BUSY=600

# Extra sendmail macros to pass.  Actually, you can add any extra
# mimedefang options here...
# MD_EXTRA="-a auth_author"

# Multiplexor queue size -- default is 0 (no queueing)
# MX_QUEUE_SIZE=10

# Multiplexor queue timeout -- default is 30 seconds
# MX_QUEUE_TIMEOUT=30

# SUBFILTER specifies which filter rules file to use
# SUBFILTER=/etc/mimedefang-filter

# The contents of the "X-Scanned-By" header added to each mail.  Do
# not use the quote mark (') in this setting.  Setting it to "-"
# prevents the header from getting added at all.
# X_SCANNED_BY="MIMEDefang N.NN (www . roaringpenguin . com / mimedefang)"

# Source configuration
if [ -f /etc/mail/$prog.conf ] ; then
    . /etc/mail/$prog.conf
fi

# Make sure required vars are set
SOCKET=${SOCKET:=$SPOOLDIR/$prog.sock}
MX_SOCKET=${MX_SOCKET:=$SPOOLDIR/$prog-multiplexor.sock}

start_it() {
    if test -r $PID ; then
	if kill -0 `cat $PID` > /dev/null 2>&1 ; then
	    echo "mimedefang (`cat $PID`) seems to be running."
	    return 1
	fi
    fi
    if test -r $MXPID ; then
	if kill -0 `cat $MXPID` > /dev/null 2>&1 ; then
	    echo "mimedefang-multiplexor (`cat $MXPID`) seems to be running."
	    return 1
	fi
    fi

    printf "%-60s" "Starting $prog-multiplexor: "
    rm -f $MX_SOCKET > /dev/null 2>&1
    if [ "$MX_EMBED_PERL" = "yes" ] ; then
	EMBEDFLAG=-E
    else
	EMBEDFLAG=""
    fi
    $PROGDIR/$prog-multiplexor -p $MXPID \
	$EMBEDFLAG \
	`[ -n "$SPOOLDIR" ] && echo "-z $SPOOLDIR"` \
	`[ -n "$FILTER" ] && echo "-f $FILTER"` \
	`[ -n "$SYSLOG_FACILITY" ] && echo "-S $SYSLOG_FACILITY"` \
	`[ -n "$SUBFILTER" ] && echo "-F $SUBFILTER"` \
	`[ -n "$MX_MINIMUM" ] && echo "-m $MX_MINIMUM"` \
	`[ -n "$MX_MAXIMUM" ] && echo "-x $MX_MAXIMUM"` \
	`[ -n "$MX_MAP_SOCKET" ] && echo "-N $MX_MAP_SOCKET"` \
	`[ -n "$MX_LOG_SLAVE_STATUS_INTERVAL" ] && echo "-L $MX_LOG_SLAVE_STATUS_INTERVAL"` \
	`[ -n "$MX_USER" ] && echo "-U $MX_USER"` \
	`[ -n "$MX_IDLE" ] && echo "-i $MX_IDLE"` \
	`[ -n "$MX_BUSY" ] && echo "-b $MX_BUSY"` \
	`[ -n "$MX_REQUESTS" ] && echo "-r $MX_REQUESTS"` \
	`[ -n "$MX_SLAVE_DELAY" ] && echo "-w $MX_SLAVE_DELAY"` \
	`[ -n "$MX_MIN_SLAVE_DELAY" ] && echo "-W $MX_MIN_SLAVE_DELAY"` \
	`[ -n "$MX_MAX_RSS" ] && echo "-R $MX_MAX_RSS"` \
	`[ -n "$MX_MAX_AS" ] && echo "-M $MX_MAX_AS"` \
	`[ "$MX_LOG" = "yes" ] && echo "-l"` \
	`[ "$MX_STATS" = "yes" ] && echo "-t /var/log/mimedefang/stats"` \
	`[ "$MX_STATS" = "yes" -a "$MX_FLUSH_STATS" = "yes" ] && echo "-u"` \
	`[ "$MX_STATS_SYSLOG" = "yes" ] && echo "-T"` \
	`[ "$MX_STATUS_UPDATES" = "yes" ] && echo "-Z"` \
	`[ -n "$MX_QUEUE_SIZE" ] && echo "-q $MX_QUEUE_SIZE"` \
	`[ -n "$MX_QUEUE_TIMEOUT" ] && echo "-Q $MX_QUEUE_TIMEOUT"` \
	`[ -n "$MX_NOTIFIER" ] && echo "-O $MX_NOTIFIER"` \
	-s $MX_SOCKET
    RETVAL=$?
    if [ $RETVAL = 0 ] ; then
	echo "[  OK  ]"
    else
	echo "[FAILED]"
	return 1
    fi

    # Start mimedefang
    printf "%-60s" "Starting $prog: "
    rm -f $SOCKET > /dev/null 2>&1
    $PROGDIR/$prog -P $PID -R $LOOPBACK_RESERVED_CONNECTIONS \
	-m $MX_SOCKET \
	`[ -n "$SPOOLDIR" ] && echo "-z $SPOOLDIR"` \
	`[ -n "$MX_USER" ] && echo "-U $MX_USER"` \
	`[ -n "$SYSLOG_FACILITY" ] && echo "-S $SYSLOG_FACILITY"` \
	`[ "$MX_RELAY_CHECK" = "yes" ] && echo "-r"` \
	`[ "$MX_HELO_CHECK" = "yes" ] && echo "-H"` \
	`[ "$MX_SENDER_CHECK" = "yes" ] && echo "-s"` \
	`[ "$MX_RECIPIENT_CHECK" = "yes" ] && echo "-t"` \
	`[ "$KEEP_FAILED_DIRECTORIES" = "yes" ] && echo "-k"` \
	`[ "$MD_EXTRA" != "" ] && echo $MD_EXTRA` \
        "`[ -n "$X_SCANNED_BY" ] && \
	        ( [ "$X_SCANNED_BY" = "-" ] && \
		        echo "-X" || echo "-x$X_SCANNED_BY" )`" \
	`[ "$ALLOW_NEW_CONNECTIONS_TO_QUEUE" = "yes" ] && echo "-q"` \
	-p $SOCKET
    RETVAL=$?
    if [ $RETVAL = 0 ] ; then
	echo "[  OK  ]"
    else
	echo "[FAILED]"
	kill `cat $MXPID`
	return 1
    fi
    return 0
}

stop_it() {
    # Stop daemon
    printf "%-60s" "Shutting down $prog: "
    if test -f "$PID" ; then
	kill `cat $PID`
	RETVAL=$?
	# killing the parent does not work when the children are still
	# running
	killall $PROGDIR/$prog
    else
	RETVAL=1
    fi
    if [ $RETVAL = 0 ] ; then
	echo "[  OK  ]"
    else
	echo "[FAILED]"
    fi

    # Stop daemon
    printf "%-60s" "Shutting down $prog-multiplexor: "
    if test -f "$MXPID" ; then
	kill `cat $MXPID`
	RETVAL=$?
    else
	RETVAL=1
    fi
    if [ $RETVAL = 0 ] ; then
	echo "[  OK  ]"
    else
	echo "[FAILED]"
    fi

    rm -f $MX_SOCKET > /dev/null 2>&1
    rm -f $SOCKET > /dev/null 2>&1

    if [ "$1" = "wait" ] ; then
	printf "Waiting for daemons to exit."
	WAITPID=""
	test -f $PID && WAITPID=`cat $PID`
	test -f $MXPID && WAITPID="$WAITPID `cat $MXPID`"
	n=0
	while [ -n "$WAITPID" ] ; do
	    W2=""
	    for pid in $WAITPID ; do
		if kill -0 $pid > /dev/null 2>&1 ; then
		    W2="$W2 $pid"
		fi
	    done
	    printf "."
	    n=`expr $n + 1`
	    test $n -eq 30 && kill -KILL $WAITPID > /dev/null 2>&1
	    test $n -eq 60 && break
	    WAITPID=$W2
	    sleep 1
	done
	echo ""
    fi

    rm -f $MXPID > /dev/null 2>&1
    rm -f $PID > /dev/null 2>&1
}

# See how we were called.
case "$1" in
  start)
  start_it
    ;;

  stop)
  stop_it $2
    ;;

  restart|force-reload)
    stop_it wait
    start_it
    RETVAL=$?
    ;;

  reread|reload)
	if [ -x $PROGDIR/md-mx-ctrl ] ; then
	    $PROGDIR/md-mx-ctrl -s $MX_SOCKET reread > /dev/null 2>&1
	    RETVAL=$?
	    if [ $RETVAL = 0 ] ; then
		echo "Told $prog-multiplexor to force reread of filter rules."
	    else
		echo "Could not communicate with $prog-multiplexor"
	    fi
	else
	    if [ -r $MXPID ] ; then
		kill -INT `cat $MXPID`
		RETVAL=$?
		if [ $RETVAL = 0 ] ; then
		    echo "Told $prog-multiplexor to force reread of filter rules."
		else
		    echo "Could not signal $prog-multiplexor"
		fi
	    else
		RETVAL=1
		echo "Could not find process-ID of $prog-multiplexor"
	    fi
	fi
    ;;

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

exit $RETVAL