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Code Issues Releases Wiki Activity

wireless_channel_occupation_: various improvements

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* add documentation header
* support dirty config
* fix shellcheck issues
This commit is contained in:
Lars Kruse 2018-04-04 04:09:41 +02:00
parent 2b66ed321e
commit 50dd7cc94e
1 changed files with 86 additions and 48 deletions
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132
plugins/network/wireless_channel_occupation_
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@ -1,28 +1,50 @@
#!/bin/sh
#
# Monitor the wifi channel occupation (taken from "iw dev wlan0 survey dump").
#
# Symlink this plugin with the name of the wifi interface added (e.g. "wlan0").
#
#
# Copyright (C) 2015 Lars Kruse <devel@sumpfralle.de>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Magic markers
#%# capabilities=autoconf suggest
: << =cut
=head1 NAME
wireless_channel_occupation_ - Monitor occupation of wireless channels
=head1 APPLICABLE SYSTEMS
All systems with at least one wireless interface and the the tool "iw".
The wifi channel occupation is parsed from the output of "iw dev wlan0 survey dump".
=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_channel_occupation_*]
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
@ -35,36 +57,26 @@ clean_fieldname() {
}
get_wifi_devices() {
get_wifi_interfaces() {
iw dev | grep Interface | awk '{print $2}'
}
get_wifi_device_from_suffix() {
local suffix
local called
called=$(basename "$0")
suffix="${called#$SCRIPT_PREFIX}"
# empty result if the prefix did not match (and was not removed)
[ "$suffix" = "$0" ] && echo "" || echo "$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 "$real_dev"
done | head -1
}
if [ "${1:-}" = "autoconf" ]; then
if which iw 2>/dev/null; then
if [ -n "$(get_wifi_devices)" ]; then
echo "yes"
else
echo "no (missing wifi devices)"
fi
else
echo "no (missing 'iw' dependency)"
fi
elif [ "${1:-}" = "suggest" ]; then
get_wifi_devices
elif [ "${1:-}" = "config" ]; then
do_config() {
local device
local dev_field
device=$(get_wifi_device_from_suffix)
[ -z "$device" ] && echo >&2 "Invalid wifi device name given" && exit 1
[ -z "$device" ] && echo >&2 "Invalid wifi device name given" && return 1
echo "graph_title Channel Occupation of $device"
echo "graph_vlabel %"
echo "graph_category wireless"
@ -93,13 +105,39 @@ elif [ "${1:-}" = "config" ]; then
echo "${dev_field}_transmit.type DERIVE"
echo "${dev_field}_transmit.draw STACK"
echo "${dev_field}_transmit.cdef 100,${dev_field}_transmit,${dev_field}_active,/,*"
else
}
do_fetch() {
local device
device=$(get_wifi_device_from_suffix)
[ -z "$device" ] && echo >&2 "Invalid wifi device name given" && exit 1
[ -z "$device" ] && echo >&2 "Invalid wifi device name given" && return 1
iw dev "$device" survey dump \
| grep -F -A 5 "[in use]" \
| grep -E "channel (busy|receive|transmit|active) time:" \
| awk '{print "'${device}_'"$2"'.value'",$4}'
| awk '{print "'"${device}_"'"$2"'.value'",$4}'
}
if [ "${1:-}" = "autoconf" ]; then
if which iw >/dev/null; then
if [ -n "$(get_wifi_interfaces)" ]; then
echo "yes"
else
echo "no (missing wifi devices)"
fi
else
echo "no (missing 'iw' dependency)"
fi
elif [ "${1:-}" = "suggest" ]; then
for dev in $(get_wifi_interfaces); do
clean_fieldname "$dev"
done
elif [ "${1:-}" = "config" ]; then
do_config || exit 1
[ "${MUNIN_CAP_DIRTYCONFIG:-0}" = 1 ] && do_fetch
else
do_fetch
fi
exit 0