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add new plugin "wireless_signal_ranges_"

monitor an overview for an anonymous (and maybe varying) set of wireless peers
This commit is contained in:
Lars Kruse 2018-04-04 05:38:05 +02:00
parent 4bd1dd52e7
commit 270be2f59e
2 changed files with 160 additions and 0 deletions

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#!/bin/sh
: << =cut
=head1 NAME
wireless_signal_ranges_ - Group and count all connected wifi peers by signal strength ranges
=head1 APPLICABLE SYSTEMS
Information is parsed from the output of the tool "iwinfo" (OpenWrt) or "iw" (most systems).
This plugin is suitable for wifi interfaces with a variable selection of peers (e.g. mobile
clients).
=head1 CONFIGURATION
Symlink this plugin with the name of the wifi interface added (e.g. "wlan0").
Root permissions are probably required for accessing "iw".
[wireless_signal_ranges_*]
user root
=head1 VERSION
1.1
=head1 AUTHOR
Lars Kruse <devel@sumpfralle.de>
=head1 LICENSE
GPLv3 or above
=head1 MAGIC MARKERS
#%# family=auto
#%# capabilities=autoconf suggest
=cut
set -eu
SCRIPT_PREFIX="wireless_signal_ranges_"
# thresholds for signal quality ranges: ascending values
SIGNAL_THRESHOLDS="-88 -80 -60 0"
# 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 $2}'; }
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 == "signal") && ($2 == "avg:")) print $3}'; }
fi
clean_fieldname() {
echo "$1" | sed 's/^\([^A-Za-z_]\)/_\1/; s/[^A-Za-z0-9_]/_/g'
}
get_level_fieldname() {
echo "range_${1#-}"
}
get_wifi_device_from_suffix() {
local suffix
local real_dev
# pick the part after the basename of the real file
suffix=$(basename "$0" | sed "s/^$SCRIPT_PREFIX//")
for real_dev in $(get_wifi_interfaces); do
[ "$suffix" != "$(clean_fieldname "$real_dev")" ] || echo "$real_dev"
done | head -1
}
do_config() {
local wifi
local lower
wifi=$(get_wifi_device_from_suffix)
[ -z "$wifi" ] && echo >&2 "Missing wifi: $wifi" && return 1
echo "graph_title Wireless signal quality ranges - $wifi"
echo "graph_args --upper-limit 0"
echo "graph_vlabel Signal ranges"
echo "graph_category network"
echo "graph_info This graph shows numbers of peers with defined wifi signal ranges"
lower="noise"
for level in $SIGNAL_THRESHOLDS; do
fieldname=$(get_level_fieldname "$level")
echo "${fieldname}.label $lower...$level"
echo "${fieldname}.draw AREASTACK"
lower="$level"
done
}
do_fetch() {
local wifi
local peer_data
local previous_count
local current_count
local fieldname
wifi=$(get_wifi_device_from_suffix)
[ -z "$wifi" ] && echo >&2 "Missing wifi: $wifi" && return 1
peer_data=$(get_wifi_peers "$wifi")
previous_count=0
for level in $SIGNAL_THRESHOLDS; do
current_count=$(echo "$peer_data" | awk '
BEGIN { count=0; }
{ if (($1 != "") && ($1 <= '"$level"')) count++; }
END { print count; }')
fieldname=$(get_level_fieldname "$level")
echo "${fieldname}.value $((current_count - previous_count))"
previous_count="$current_count"
done
}
ACTION="${1:-}"
case "$ACTION" in
config)
do_config || exit 1
[ "${MUNIN_CAP_DIRTYCONFIG:-0}" = 1 ] && do_fetch
;;
autoconf)
[ -z "$(get_wifi_interfaces)" ] && echo "no (no wifi interfaces found)" && exit 1
echo "yes"
;;
suggest)
get_wifi_interfaces | while read -r ifname; do
clean_fieldname "$ifname"
done
;;
"")
do_fetch
;;
*)
echo >&2 "Invalid action (valid: config / autoconf / suggest / <empty>)"
echo >&2
exit 2
;;
esac