#!/bin/sh
#
# Copyright (c) 2015-2016 Devin Teske
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

# PROVIDE: pptp
# REQUIRE: DAEMON LOGIN FILESYSTEMS
# KEYWORD: shutdown

. /etc/rc.subr

name="pptp"
rcvar="${name}_enable"
command="%%PREFIX%%/sbin/${name}"
pidfile="/var/run/${name}.pid"
: ${pptp_timeout=10}
extra_commands="iface inet"

pptp_query()
{
	local qtype="$1"
	ifconfig -l | awk '{
		n = split($0, a)
		for (i = 1; i <= n; i++)
			if (a[i] ~ /^tun[[:digit:]]+/) print a[i]
	}' | xargs -rn1 -Iif ifconfig if inet | awk -v qtype="$qtype" '
	BEGIN { qtype = tolower(qtype) }
	/^[^[:space:]]/ { iface = $1; next }
	iface && $1 == "inet" && $3 == "-->" { inet[iface] = $2; next }
	$1$2$3 == "OpenedbyPID" { pid[iface] = $4 }
	END {
		for (iface in pid) {
			(cmd = "ps -o ucomm= -p " pid[iface]) | getline ucomm
			close(cmd)
			if (ucomm != "ppp") continue
			if (qtype == "iface") {
				sub(/:.*/, "", iface)
				print iface
				found = 1
			} else if (qtype == "inet" && inet[iface]) {
				print inet[iface]
				found = 1
			} else if (qtype != "inet") {
				print pid[iface]
				found = 1
			}
		}
		exit !found
	}'
}

pptp_start()
{
	local pid inet timeout="$pptp_timeout"
	if pid=$( pptp_query pid ); then
		echo "$name already running as pid $pid."
		return 1
	fi

	debug "$command $pptp_flags &"
	eval $command $pptp_flags \&
	echo -n "Waiting for pptp to start"
	if [ $timeout -gt 0 ] 2> /dev/null; then
		while [ $timeout -gt 0 ] && ! pid=$( pptp_query pid ); do
			sleep 1
			echo -n .
			timeout=$(( $timeout - 1 ))
		done
	else
		while ! pid=$( pptp_query pid ); do sleep 1; echo -n .; done
	fi
	echo
	echo -n "Waiting for ppp session"
	while pid=$( pptp_query pid ); do
		inet=$( pptp_query inet ) && break
		sleep 1
		echo -n .
	done
	echo
	if ! inet=$( pptp_query inet ); then
		rm -f "$pidfile"
		echo "pptp failed to start."
		return 1
	fi
	echo "$pid" > "$pidfile"
}

pptp_stop()
{
	local pid
	if ! pid=$( pptp_query pid ); then
		echo "$name is not running."
		return 1
	fi

	kill $pid
	echo -n "Waiting for pid $pid to exit"
	while pid=$( pptp_query pid ); do sleep 1; echo -n .; done
	echo
	rm -f "$pidfile"
	echo "$name stopped."
}

pptp_status()
{
	local pid
	if ! pid=$( pptp_query pid ); then
		echo "$name is not running."
		return 1
	fi
	echo "$name is running as pid $pid."
}

pptp_iface()
{
	local pid iface
	if ! pid=$( pptp_query pid ); then
		echo "$name is not running." >&2
		return 1
	fi
	if ! iface=$( pptp_query iface ); then
		echo "$name not associated with any interface." >&2
		return 1
	fi
	echo "$iface"
}

pptp_inet()
{
	local pid inet
	if ! pid=$( pptp_query pid ) || ! inet=$( pptp_query inet ); then
		echo "$name is not running." >&2
		return 1
	fi
	echo "$inet"
}

start_cmd=pptp_start
stop_cmd=pptp_stop
status_cmd=pptp_status
iface_cmd=pptp_iface
inet_cmd=pptp_inet

load_rc_config $name
run_rc_command "$1"