#!/bin/bash

#
#    heartbeat survaillance
#           script
#

#  ****  config section  ****

author="david@socialnerds.org"
version="0.1"
sourcefile="/etc/hosts"
excludes="127.0.0.1 127.0.1.1 ::1 fe00::0 ff00::0 ff02::1 ff02::2 ff02::3"
options="-n -c 5 -i 0.2 -W 1"
maxloss="20%"
log2stdout="1"
logwhat="mbots_heartbeat"
configfile="/etc/mbots/mbots.conf"
giturl="git://git.aec.at/mbots.git"


#  ****  preflight  ****

#read configfile
if [ -r $configfile ]; then
    source $configfile
else
    echo "ERROR: configfile not found. terminating."
    exit 1
fi

#load bashlib
if [ -d $bashlibpath ]; then
    source $bashlibpath/main
    source $bashlibpath/logengine
    log debug "preflight - logengine loaded"
else
    echo "ERROR: bashlib not found. terminating."
    exit 1
fi


#  ****  function definition  ****

check()
{

    local ip=$1

    echo $ip | grep ":" &> /dev/null
    local isv4=$?
    if [ $isv4 = "1" ]; then
        # run ipv4 ping
        local value=$(ping $options $ip | grep -o -e "[0-9]*%")
    elif [ $isv4 = "0" ]; then
        # run ipv6 ping
        local value=$(ping6 $options $ip | grep -o -e "[0-9]*%")
    fi

    if [ ${value:0:$((${#value}-1))} -gt ${maxloss:0:$((${#maxloss}-1))} ]; then
        log error "not able to reach $(echo $line | awk '{print $2}') at $ip"
    fi

}


#  ****  start of script  ****

# set linecount to 1
linecount="1"

# read line by line of $sourcefile
while read line; do

    #get first letter of line
    fletter=${line:0:1}
    if [ -z $fletter ]; then
        #skip line, it's empty
        :
    elif [ $fletter = "#" ]; then
        #skip line, it's a comment
        :
    else
        #exclusion of $excludes
        excluded="0"
        for var in $excludes; do
            #check if ip is excluded
            if [ $(echo $line | awk '{print $1}') = $var ]; then
                excluded="1"
                break
            fi
        done

        #run check function for ip if not excluded
        if [ $excluded = "1" ]; then
            continue
        else
            #run actual ping
            check "$(echo $line | awk '{print $1}')"
        fi
        
    fi

    #count lines
    let linecount++

done < $sourcefile


exit 0
#  ****  end of script  ****