#!/bin/bash
#/usr/lib/check_mk_agent/local
export LANG=de_DE.UTF-8

function confline # get first line from file $1 mathing $2, stripped of # and ; comment lines, stripped spaces and tabs down to spaces, remove trailing ;
{
 echo $(cat $1|grep -v '^$\|^\s*\#'|sed -e "s/[[:space:]]\+/ /g"|sed s/^\ //|sed s/\;//|grep -i "$2"|head -n 1)
}

function ati # ipv4 to longint
{
 ip4=$1; ipno=0
 for (( i=0 ; i<4 ; ++i )); do
   ((ipno+=${ip4%%.*}*$((254**$((3-${i})))))) # .0 .255 should not be counted
   ip4=${ip4#*.}
  done
 echo $ipno
}

## static data
bat_version=$(batctl -v);
kernel=$(uname -r);
release=$(lsb_release -ds);

## Batman
echo "0 Batman-Version Version=$bat_version; $bat_version"
list=$(ls -F /sys/kernel/debug/batman_adv|grep /)
for i in $list; do
  z=$(ls /sys/kernel/debug/batman_adv/$i|wc -l)
  if [ $z -ge 9 ]; then
    b=$(echo $i|cut -d '/' -f1)
    router=$(($(batctl -m $b o|wc -l)-2 ))
    clients=$(grep -cEo "\[.*W.*\]+" /sys/kernel/debug/batman_adv/$b/transtable_global)
    gateways=$(( $(batctl -m $b gwl|wc -l) -1 ))
    ips=$(( $(batctl -m $b dc|wc -l) - 2))
    wlow=$(( $router * 20 / 100 ))
    clow=$(( $router * 5 / 100 ))
    wlimit=$(( $router * 5 ))
    climit=$(( $router * 10 ))
    echo "P Batman-$b Router=$router.0;5:250;1:500|Clients=$clients.0;$wlow.0:$wlimit.0;$clow.0:$climit.0|Gateways=$gateways.0;0:3;0:5;|IPs=$ips.0";
   fi;
 done

## isc-dhcpd-server leases
# needs script https://github.com/eulenfunk/scripts/blob/master/dhcpleases
if [ -r /opt/freifunk/dhcpleases ] ; then
  totalleases=2040
  activeleases=$(python /opt/freifunk/dhcpleases|grep "^| Total"|cut -d":" -f2|sed s/\ //)
  remainingleases=$(($totalleases - $activeleases))
  actwarn=$(($totalleases * 75 / 100))
  actcrit=$(($totalleases * 90 / 100))
  echo "P Dhcp-Leases active-leases=$activeleases.0;5:$actwarn;1:$actcrit active:$activeleases remaining:$remainingleases pool=$totalleases";
 fi

#L2TP
l_tunnel=$(ip a |grep l2tp | grep br-nodes -c);
tunneldigger=$(ifconfig|grep br-nodes -c);
echo "P L2TP Clients=$l_tunnel.0;1:100;0:150|Tunneldiggerbridges=$tunneldigger.0;0.1:1;0.1:2; L2TP-Clients:$l_tunnel Tunneldiggerbridges:$tunneldigger"

## Conntrack
conntrack=$(conntrack -C);
conntrack_limit=$(sysctl -a 2>/dev/null |grep net.nf_conntrack_max|cut -d ' ' -f 3);
conntrack_remain=$(echo $conntrack_limit - $conntrack|bc)
wlow=0.1
clow=1.1
wlimit=$(echo $conntrack_limit *0.7|bc)
climit=$(echo $conntrack_limit *0.9|bc)
wrlimit=$(echo $conntrack_limit *0.3|bc)
crlimit=$(echo $conntrack_limit *0.1|bc)
echo "P Conntrack conntrack=$conntrack.0;$wlow:$wlimit;$clow:$climit|conntrack_remain=$conntrack_remain.0;$wrlimit:$conntrack_limit;$crlimit:$conntrack_limit; Conntrack:$conntrack Conntrack-Remain:$conntrack_remain Conntrack-Limit:$conntrack_limit"