#!/bin/sh /etc/rc.common
#
# description: Startup/shutdown script for nodogsplash captive portal
#
# P. Kube 2007
#
# (Based on wifidog startup script
# Date    : 2004-08-25
# Version : 1.0
# Comment by that author: Could be better, but it's working as expected)
#

START=95
STOP=95

USE_PROCD=1

IPT=/usr/sbin/iptables
WD_DIR=/usr/bin
NDS_CONF=/etc/nodogsplash/nodogsplash.conf
# -s -d 5 runs in background, with level 5 (not so verbose) messages to syslog
# -f -d 7 runs in foreground, with level 7 (verbose) debug messages to terminal
OPTIONS="-s -f -d 5"

start_service() {
	if test_module ;  then
		procd_open_instance
		procd_set_param command /usr/bin/nodogsplash $OPTIONS
		procd_set_param respawn
		procd_close_instance
	else
		logger -s -t nodogsplash -p daemon.error "nodogsplash is missing some kernel modules"
	fi
}

stop_service() {
	# nodogsplash doesn't exit fast enought, when procd terminates it.
	# otherwise procd will restart nodogsplash twice. first time starting nodogsplash fails, second time it succeeds
	sleep 1
}

status() {
	$WD_DIR/ndsctl status
}

test_module() {

    ### Test ipt_mark with iptables
    test_ipt_mark () {
	($IPT -A FORWARD -m mark --mark 2 -j ACCEPT 2>&1) > /dev/null
	IPTABLES_OK=$?
	if [ "$IPTABLES_OK" -eq 0 ]; then
	    ($IPT -D FORWARD -m mark --mark 2 -j ACCEPT 2>&1) > /dev/null
	    return 0
	else
	    return 1
	fi
    }
    ### Test ipt_mac with iptables
    test_ipt_mac () {
	($IPT -A INPUT -m mac --mac-source 00:00:00:00:00:00 -j ACCEPT 2>&1) > /dev/null
	IPTABLES_OK=$?
	if [ "$IPTABLES_OK" -eq 0 ]; then
	    ($IPT -D INPUT -m mac --mac-source 00:00:00:00:00:00 -j ACCEPT 2>&1) > /dev/null
	    return 0
	else
	    return 1
	fi
    }

    ### Test ipt_IMQ with iptables
    test_ipt_IMQ () {
	($IPT -t mangle -A PREROUTING -j IMQ --todev 0 2>&1) > /dev/null
	IPTABLES_OK=$?
	if [ "$IPTABLES_OK" -eq 0 ]; then
	    ($IPT -t mangle -D PREROUTING -j IMQ --todev 0 2>&1) > /dev/null
	    return 0
	else
	    return 1
	fi
    }

    ### Test imq with ip
    test_imq () {
	(ip link set imq0 up 2>&1) > /dev/null
	IMQ0_OK=$?
	(ip link set imq1 up 2>&1) > /dev/null
	IMQ1_OK=$?
	if [ "$IMQ0_OK" -eq 0 -a "$IMQ1_OK" -eq 0 ]; then
	    (ip link set imq0 down 2>&1) > /dev/null
	    (ip link set imq1 down 2>&1) > /dev/null
	    return 0
	else
	    return 1
	fi
    }

    ### Test sch_htb with tc; requires imq0
    test_sch_htb () {
	(tc qdisc del dev imq0 root 2>&1) > /dev/null
	(tc qdisc add dev imq0 root htb 2>&1) > /dev/null
	TC_OK=$?
	if [ "$TC_OK" -eq 0 ]; then
	    (tc qdisc del dev imq0 root 2>&1) > /dev/null
	    return 0
	else
	    return 1
	fi
    }

    
    ### Find a module on disk
    module_exists () {
      EXIST=$(find /lib/modules/`uname -r` -name $1.*o 2> /dev/null)
      if [ -n "$EXIST" ]; then
        return 0
      else
        return 1
      fi
    }

    ### Test if a module is in memory
    module_in_memory () {
      MODULE=$(lsmod | grep $1 | awk '{print $1}')
      if [ "$MODULE" = "$1" ]; then
        return 0
      else
        return 1
      fi
    }

    ### Test functionality of a module; load if necessary
    do_module_tests () {
	echo "  Testing module $1 $2"
	"test_$1"
	if [ $? -ne 0 ]; then
	    echo "   Module $1 $2 needed"
	    echo "   Scanning disk for $1 module"
	    module_exists $1
	    if [ $? -ne 0 ]; then 
		echo "   $1 module missing: please install it"
		exit 1
	    else
		echo "   $1 exists, trying to load"
		insmod $1 $2 > /dev/null
		if [ $? -ne 0 ]; then
		    echo "   Error: insmod $1 $2 failed"
		    exit 1
		else
		    echo "   $1 $2 loaded successfully"
		fi
	    fi
	else
	    echo "   $1 is working"
	fi 
		
    }

    echo " Testing required modules"

    do_module_tests "ipt_mac"
    do_module_tests "ipt_mark"

    # test for imq modules, only if TrafficControl is enabled in conf
    if ( grep -q -E '^[[:space:]]*TrafficControl[[:space:]]+(yes|true|1)' "$NDS_CONF" ) ; then
        do_module_tests "imq" "numdevs=2"
        do_module_tests "ipt_IMQ"
        do_module_tests "sch_htb"
    fi
}