140 lines
3.5 KiB
Bash
Executable File
140 lines
3.5 KiB
Bash
Executable File
#!/bin/sh
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: << =cut
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=head1 NAME
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wireless_channel_active - Show currently used channel of wifi enabled devices
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=head1 APPLICABLE SYSTEMS
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Information is parsed from the output of the tool "iwinfo" (OpenWrt) or "iw" (most systems).
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=head1 CONFIGURATION
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Symlink this plugin with the name of the wifi device added (e.g. "phy0").
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Root permissions are probably required for accessing "iw".
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[wireless_channel_active*]
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user root
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=head1 VERSION
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1.1
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=head1 AUTHOR
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Lars Kruse <devel@sumpfralle.de>
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=head1 LICENSE
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GPLv3 or above
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=head1 MAGIC MARKERS
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#%# family=auto
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#%# capabilities=autoconf suggest
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=cut
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set -eu
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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_physical_interfaces() { iwinfo | sed -n 's/^.*PHY name: \+\(.*\)$/\1/p'; }
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get_physical_interface_current_channel() { iwinfo "$1" info \
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| grep Channel | sed 's/^.*Channel: \+\([0-9]\+\) .*$/\1/'; }
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get_physical_interfaces_channel_descriptions() {
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# return: CHANNEL CHANNEL_DESCRIPTION
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# e.g.: "104 5.520 GHz (Channel 104)"
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iwinfo "$1" freqlist | sed 's/^[^0-9]*//' \
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| sed 's/^.*Channel \+\([0-9]\+\).*$/\1 \0/'; }
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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_physical_interfaces() { iw list | awk '/^\w/ {print $2}'; }
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get_physical_interface_current_channel() { iw dev | awk '
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/^\w+#/ { phy_name=gensub("#", "", 1, $1); }
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/channel/ { if (phy_name == "phy0") print($2); }'; }
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get_physical_interfaces_channel_descriptions() {
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# example input: "* 5680 MHz [136]"
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# return: CHANNEL CHANNEL_DESCRIPTION
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# e.g.: "136 5680 MHz [136]"
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iw phy phy0 channels | awk '
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/\*/ { chan_num=gensub("^.*\\[", "", 1, gensub("\\].*$", "", 1, $0));
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print(chan_num, $2, $3, $4); }'; }
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fi
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get_selected_physical_interface() {
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# The physical interface name should be safe (phyX) and needs no cleanup.
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# pick the last segment after the final "_"
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echo "$0" | sed 's/.*_//'
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}
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do_config() {
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local phy
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phy=$(get_selected_physical_interface)
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[ -z "$phy" ] && echo >&2 "Missing wireless PHY" && return 1
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echo "graph_title Wireless channel usage - $phy"
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echo "graph_args --base 1000 -r --lower-limit 0 --upper-limit 100"
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echo "graph_vlabel Channel usage by time in percent"
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echo "graph_category wireless"
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echo "graph_info This graph shows the currently used channel of your WiFi device(s)"
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get_physical_interfaces_channel_descriptions "$phy" | while read -r channel description; do
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fieldname="channel_${channel}"
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echo "${fieldname}.label $description"
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echo "${fieldname}.draw AREASTACK"
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# percent scaling
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echo "${fieldname}.cdef 100,${fieldname},*"
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done
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}
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do_fetch() {
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local phy
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local current_channel
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phy=$(get_selected_physical_interface)
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[ -z "$phy" ] && echo >&2 "Missing wireless PHY" && return 1
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current_channel=$(get_physical_interface_current_channel "$phy")
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get_physical_interfaces_channel_descriptions "$phy" | while read -r channel description; do
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[ "$current_channel" = "$channel" ] && value=1 || value=0
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echo "channel_${channel}.value $value"
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done
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}
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ACTION="${1:-}"
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case "$ACTION" in
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config)
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do_config || exit 1
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if [ "${MUNIN_CAP_DIRTYCONFIG:-0}" = 1 ]; then do_fetch; fi
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;;
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autoconf)
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if [ -z "$(get_physical_interfaces)" ]; then
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echo "no (no wifi interfaces found)"
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else
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echo "yes"
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fi
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;;
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suggest)
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get_physical_interfaces
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;;
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"")
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do_fetch
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;;
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*)
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echo >&2 "Invalid action (valid: config / autoconf / suggest / <empty>)"
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echo >&2
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exit 2
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;;
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esac
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