#!/bin/bash
#
# Plugin made by Dju
# useful to know your freebox uptime, and to see when it has rebooted ;)
#
# Uses nmap to get the uptime (by tcp connection, RFC1323)
# ports usually opened on the freebox: 80 554 9100
#
# ----------------------------------------------------------------------------------------------------
# nmap example with the -O option
# on a freebox v5
#
# Starting Nmap 4.62 ( http://nmap.org ) at 2010-12-17 02:25 CET
# Interesting ports on mafreebox.freebox.fr (212.27.38.253):
# Not shown: 1712 filtered ports
# PORT     STATE SERVICE
# 80/tcp   open  http
# 554/tcp  open  rtsp
# 9100/tcp open  jetdirect
# Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port
# Device type: remote management
# Running: HP embedded
# OS details: HP Onboard Administrator management console
# Uptime: 7.226 days (since Thu Dec  9 21:01:44 2010)
# 
# OS detection performed. Please report any incorrect results at http://nmap.org/submit/ .
# Nmap done: 1 IP address (1 host up) scanned in 29.279 seconds
# ----------------------------------------------------------------------------------------------------
#
# by using nmap on a specific tcp port, the detection is pretty fast (2-5 seconds)
# with this command: nmap -O --osscan-guess -p80 remote_host
#
# if you dont want nmap to query your freebox each time, set CACHE_HOURS=n
# to keep the uptime in cache for n hours
# if not, set CACHE_HOURS=0
#
# to allow this plugin to use nmap, edit /etc/munin/plugin-conf.d/munin-node and add
# [FreeboxUptime]
# user root
#
# exit value if error:
# 1: nmap not installed
# 2: freebox not reachable by ping
# 3: uptime not found in nmap result
#
# Magic markers - optional - used by installation scripts and
# munin-config:
#
#%# family=manual
#%# capabilities=autoconf

CACHE_FILE=/var/lib/munin/plugin-state/FreeboxUptime.cache
CACHE_HOURS=3
NMAP=$(which nmap)
TCP_PORT=9100
FREEBOX_HOST=mafreebox.freebox.fr

# check if network connection is ok
if ping -c1 -w1 -s20 $FREEBOX_HOST 2>/dev/null > /dev/null; then
   PING=1
else
   PING=0
fi

if [ "$1" = "autoconf" ]; then
	if [ -z "$NMAP" ]; then
		echo "no (nmap not installed)"
		exit 1
	else
		if [ $PING -eq 0 ]; then
			echo "no (Freebox not reachable)"
			exit 2
		else
			echo yes 
			exit 0
		fi
	fi
fi


if [ "$1" = "config" ]; then

	echo 'graph_title Freebox Uptime'
	echo 'graph_category system'
	echo 'graph_args --base 1000 -l 0 '
	echo 'graph_vlabel uptime in days'
	graph_info="Shows the uptime of your freebox (cache: ${CACHE_HOURS}h"
	if [ -f $CACHE_FILE ]; then
		lastCheck=$(stat -c %z $CACHE_FILE | cut -d"." -f1)
		lastReboot=$(awk -F"@" '{print $2}' $CACHE_FILE)	
		graph_info="${graph_info} - last check: ${lastCheck} - last reboot: $lastReboot"
	else
		graph_info="${graph_info})"
	fi
	echo "graph_info ${graph_info}"
	echo 'uptime.label uptime'
	echo 'uptime.draw AREA'
	exit 0
fi


if [ -z "$NMAP" ]; then
	exit 1
elif [ $PING -eq 0 ]; then
	exit 2
else
	use_nmap=1
	if [ -f $CACHE_FILE ]; then
		ts_cache=$(stat -c %Y $CACHE_FILE)
		ts_now=$(date "+%s")
		sec_diff=$(expr $ts_now - $ts_cache)
		hours_diff=$(expr $sec_diff / 3600)
		if [ $hours_diff -lt $CACHE_HOURS ]; then
			use_nmap=0
			uptime=$(cat $CACHE_FILE | awk -F"@" '{print $1}')
		fi
	fi
	if [ $use_nmap -eq 1 ]; then
		uptime=$(nmap -O --osscan-guess -p${TCP_PORT} ${FREEBOX_HOST} | grep Uptime)
		if [ -z "$uptime" ]; then
			exit 3
		else
			lastReboot=$(echo $uptime | grep -o '(since .*)' | sed 's/(since //g')
			uptime=$(echo $uptime | awk '{print $2}')
			echo "${uptime}@${lastReboot}" > $CACHE_FILE
		fi
	fi
	echo "uptime.value ${uptime}"
fi