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