mirror of
https://github.com/munin-monitoring/contrib.git
synced 2018-11-08 00:59:34 +01:00
109 lines
3.2 KiB
Bash
Executable File
109 lines
3.2 KiB
Bash
Executable File
#!/bin/sh
|
|
#
|
|
# Show current signal strength and noise for all connected peers of wifi devices.
|
|
# This plugin is suitable for wifi interfaces with a stable selection of peers
|
|
# (e.g. infrastructure).
|
|
# Author: Lars Kruse, devel@sumpfralle.de
|
|
# License: GPL v3 or later
|
|
#
|
|
# Requirements:
|
|
# * "iwinfo" tool (alternatively: fall back to "iw" - with incomplete data)
|
|
# * root privileges (for "iw" and "iwinfo")
|
|
#
|
|
# Magic markers
|
|
#%# capabilities=autoconf suggest
|
|
#%# family=auto
|
|
|
|
|
|
set -eu
|
|
|
|
|
|
# prefer "iwinfo" for information retrieval, if it is available
|
|
if which iwinfo >/dev/null; then
|
|
# "iwinfo" has a stable output format but is only available on openwrt
|
|
get_wifi_interfaces() { iwinfo | grep "^[a-zA-Z]" | awk '{print $1}'; }
|
|
# return MAC of peer and the signal strength
|
|
get_wifi_peers() { iwinfo "$1" assoclist | grep "^[0-9a-fA-F]" | awk '{print $1,$2}'; }
|
|
# the noise should be the same for all peers
|
|
get_wifi_noise() { iwinfo "$1" info | sed -n 's/^.* Noise: \([0-9-]\+\).*/\1/p'; }
|
|
else
|
|
# "iw" is available everywhere - but its output format is not recommended for non-humans
|
|
get_wifi_interfaces() { iw dev | awk '{ if ($1 == "Interface") print $2; }'; }
|
|
get_wifi_peers() { iw dev wlan0 station dump \
|
|
| awk '{ if ($1 == "Station") mac=$2; if (($1 == "signal") && ($2 == "avg:")) print mac,$3}'; }
|
|
# TODO: there seems to be no way to retrieve the noise level via "iw"
|
|
get_wifi_noise() { echo; }
|
|
fi
|
|
|
|
|
|
clean_fieldname() {
|
|
echo "$1" | sed 's/^\([^A-Za-z_]\)/_\1/; s/[^A-Za-z0-9_]/_/g'
|
|
}
|
|
|
|
|
|
get_ip_for_mac() {
|
|
local ip
|
|
ip=$(arp -n | grep -iw "$1$" | awk '{print $1}' | sort | head -1)
|
|
[ -n "$ip" ] && echo "$ip" && return 0
|
|
# no IP found - return MAC instead
|
|
echo "$1"
|
|
}
|
|
|
|
|
|
get_wifi_device_from_suffix() {
|
|
local suffix
|
|
local real_dev
|
|
# pick the part after the basename of the real file
|
|
suffix=$(basename "$0" | sed "s/^$(basename "$(readlink "$0")")//")
|
|
for real_dev in $(get_wifi_interfaces); do
|
|
[ "$suffix" != "$(clean_fieldname "$real_dev")" ] || echo "$real_dev"
|
|
done | head -1
|
|
}
|
|
|
|
|
|
ACTION="${1:-}"
|
|
|
|
case "$ACTION" in
|
|
config)
|
|
wifi=$(get_wifi_device_from_suffix)
|
|
echo "graph_title Wireless signal quality - $wifi"
|
|
echo "graph_args --upper-limit 0"
|
|
echo "graph_vlabel Signal and noise [dBm]"
|
|
echo "graph_category network"
|
|
echo "graph_info This graph shows the signal and noise for all wifi peers"
|
|
echo "noise.label Noise floor"
|
|
echo "noise.draw LINE"
|
|
# sub graphs for all peers
|
|
get_wifi_peers "$wifi" | while read mac signal; do
|
|
fieldname=$(clean_fieldname "peer_${mac}")
|
|
peer=$(get_ip_for_mac "$mac")
|
|
echo "signal_${fieldname}.label $peer"
|
|
echo "signal_${fieldname}.draw LINE"
|
|
done
|
|
;;
|
|
autoconf)
|
|
[ -z "$(get_wifi_interfaces)" ] && echo "no (no wifi interfaces found)" && exit 1
|
|
echo "yes"
|
|
;;
|
|
suggest)
|
|
get_wifi_interfaces | while read ifname; do
|
|
clean_fieldname "$ifname"
|
|
done
|
|
;;
|
|
"")
|
|
wifi=$(get_wifi_device_from_suffix)
|
|
peer_data=$(get_wifi_peers "$wifi")
|
|
echo "$peer_data" | while read mac signal; do
|
|
# ignore empty datasets
|
|
[ -z "$signal" ] && continue
|
|
fieldname=$(clean_fieldname "peer_${mac}")
|
|
echo "signal_${fieldname}.value $signal"
|
|
done
|
|
echo "noise.value $(get_wifi_noise "$wifi")"
|
|
;;
|
|
*)
|
|
echo >&2 "Invalid action (valid: config)"
|
|
echo >&2
|
|
;;
|
|
esac
|