#!/bin/sh

. "$MUNIN_LIBDIR/plugins/plugin.sh"

: <<=cut

=head1 NAME

multibandwidth - Plugin to monitor the bandwidth between localhost and serveral hosts.

=head1 APPLICABLE SYSTEMS

All systems with “bash”, and “munin”

=head1 REQUIREMENTS

bing installed.

You can install bing by using (Ubuntu/Debian): apt-get install bing

=head1 CONFIGURATION

The following is the default configuration

[multibandwidth]
user root
env.hosts example.org example2.org example3.org
env.samples 10
env.small_packet_size 44
env.big_packet_size 108

- env.hosts explanation: hostname or IP of the hosts to calculate the bandwidth.

- env.samples explanation: Reset stats after sending samples ECHO_REQUEST packets.

- env.small_packet_size explanation: Specifies the number of data bytes to be sent in the small
        packets. The default and minimum value is 44.

- env.big_packet_size explanation: Specifies the number of data bytes to be sent in the big
        packets. The default is 108. The size should be chosen so that big packet roundtrip times
        are long enough to be accurately measured.


=head1 MAGIC MARKERS

#%# capabilities=autoconf

=head1 VERSION

1.1.17

=head1 AUTHOR

Jose Manuel Febrer Cortés <https://www.linkedin.com/in/jfebrer/>
Marco Bertola’s help <https://www.linkedin.com/in/bertolamarco/>

=head1 LICENSE

GPLv2

=cut



case $1 in
   config)
                echo graph_title MultiBandwidth
                echo 'graph_vlabel bps'
                echo 'graph_args --base 1024 -l 0'
                echo 'graph_scale yes'
                echo 'graph_category network'
                echo 'graph_info This graph shows the bandwidth between localhost and serveral hosts'
                for host in $hosts; do
                        fieldname="host_$(clean_fieldname "$host")"
                        echo "$fieldname.label $host"
                        echo "$fieldname.draw LINE2"
                        echo "$fieldname.info Bandwidth statistics for $host"
                done
        exit 0;;
    autoconf)
                if hash bing 2>/dev/null; then
                        echo 'yes'
                        exit 0;
                else
                        echo 'no (bing not installed)'
                        exit 0;
                fi

esac


#Calculating the bandwidth
for host in $hosts; do
        fieldname="host_$(clean_fieldname "$host")"
        printf "$fieldname.value ";

        SPEED=$(timeout 6 bing localhost "$host" -n -c 1 -e "$samples" -s "$small_packet_size" -S "$big_packet_size" 2>/dev/null \
                |grep "estimated link" -A 2 \
                | grep bps \
                | awk '{print $2}' \
                | cut -d "b" -f1)

        if (echo "$SPEED" | grep -q "M"); then
                echo "$SPEED" | awk '{a+=$1} END{print a*1000000}'
        elif (echo "$SPEED" | grep -q "K"); then
                echo "$SPEED" | awk '{a+=$1} END{print a*1000}'
        elif (echo "$SPEED" | grep -q "G"); then
                echo "$SPEED" | awk '{a+=$1} END{print a*1000000000}'
        else
                echo "Error: no data (timeout)" >&2
        fi
done