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91 lines
2.7 KiB
Plaintext
91 lines
2.7 KiB
Plaintext
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#!/bin/bash
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# Copyright (C) 2012 Stefan Breunig <stefan+measure-net-speed@mathphys.fsk.uni-heidelberg.de>
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# Copyright (C) 2014 kaueraal
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# Copyright (C) 2015 Thiago Perrotta <perrotta dot thiago at poli dot ufrj dot br>
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Use the provided interface, otherwise the device used for the default route.
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if [[ -n $BLOCK_INSTANCE ]]; then
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INTERFACE=$BLOCK_INSTANCE
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else
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INTERFACE=$(ip route | awk '/^default/ { print $5 ; exit }')
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fi
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# Issue #36 compliant.
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if ! [ -e "/sys/class/net/${INTERFACE}/operstate" ] || ! [ "`cat /sys/class/net/${INTERFACE}/operstate`" = "up" ]
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then
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echo "$INTERFACE down"
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echo "$INTERFACE down"
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echo "#FF0000"
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exit 0
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fi
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# path to store the old results in
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path="/dev/shm/$(basename $0)-${INTERFACE}"
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# grabbing data for each adapter.
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read rx < "/sys/class/net/${INTERFACE}/statistics/rx_bytes"
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read tx < "/sys/class/net/${INTERFACE}/statistics/tx_bytes"
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# get time
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time=$(date +%s)
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# write current data if file does not exist. Do not exit, this will cause
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# problems if this file is sourced instead of executed as another process.
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if ! [[ -f "${path}" ]]; then
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echo "${time} ${rx} ${tx}" > "${path}"
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chmod 0666 "${path}"
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fi
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# read previous state and update data storage
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read old < "${path}"
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echo "${time} ${rx} ${tx}" > "${path}"
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# parse old data and calc time passed
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old=(${old//;/ })
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time_diff=$(( $time - ${old[0]} ))
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# sanity check: has a positive amount of time passed
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[[ "${time_diff}" -gt 0 ]] || exit
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# calc bytes transferred, and their rate in byte/s
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rx_diff=$(( $rx - ${old[1]} ))
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tx_diff=$(( $tx - ${old[2]} ))
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rx_rate=$(( $rx_diff / $time_diff ))
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tx_rate=$(( $tx_diff / $time_diff ))
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# shift by 10 bytes to get KiB/s. If the value is larger than
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# 1024^2 = 1048576, then display MiB/s instead
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# incoming
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echo -n " "
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rx_kib=$(( $rx_rate >> 10 ))
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if [[ "$rx_rate" -gt 1048576 ]]; then
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printf '%sk' "`echo "scale=1; $rx_kib / 1024" | bc`"
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else
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echo -n "${rx_kib}k"
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fi
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echo -n " "
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# outgoing
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echo -n " "
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tx_kib=$(( $tx_rate >> 10 ))
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if [[ "$tx_rate" -gt 1048576 ]]; then
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printf '%sm' "`echo "scale=1; $tx_kib / 1024" | bc`"
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else
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echo -n "${tx_kib}k"
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fi
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