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118 lines
2.6 KiB
Bash
Executable file
118 lines
2.6 KiB
Bash
Executable file
#!/bin/sh
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: <<=cut
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=head1 NAME
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brc_rssi - monitor RSSI (Received Signal Strength Indication) of wireless accesspoints
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=head1 APPLICABLE SYSTEMS
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Wireless accesspoints with Broadcom chipset such as found on hardware supported by OpenWRT.
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The utility "wl" is required.
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=head1 CONFIGURATION
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[brc_rssi]
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env.WIFISIDE eth0 # Set the WiFi side interface. Used to filter arp entries.
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# On a openwrt box defaults to "nvram get lan_ifname" otherwise
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# no default.
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=head1 BUGS
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=over 4
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=item Should have a persistent list of macs ever seen.
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=back
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=head1 AUTHORS
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Copyright (C) 2007 Nicolai Langfeldt <janl@linpro.no>
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=head1 LICENSE
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GNU General Public License v2.0 only
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SPDX-License-Identifier: GPL-2.0-only
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=head1 MAGIC MARKERS
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#%# family=contrib
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#%# capabilities=autoconf
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=cut
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PATH=/usr/bin:/usr/sbin:/bin:/sbin
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export PATH
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AL="$(wl assoclist 2>&1)"
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WLERR=$?
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case $WLERR in
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0) MACS="$(echo "$AL" | cut -d' ' -f2)";;
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esac
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do_ () {
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# Fetch
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for M in $MACS; do
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RSSI=$(wl rssi $M | cut -d' ' -f3)
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m=$(echo $M | tr -d ':')
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echo rssi$m.value $RSSI
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done
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}
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do_config () {
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cat <<'EOF'
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graph_title WiFi AP RSSI
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graph_vlabel dB(?)
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graph_category network
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graph_info This plugin shows the RSSI (Received Signal Strength Indication) as reported by the Access Point (AP) driver. The plugin is specific to broadcom wireless chipsets such as used on WRT hardware. We're not <em>quite</em> sure about the units the RSSI is measured in as this is not documented. Both dB and dBm are apparently candidates. Higher is better.
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EOF
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# Attempt to find default. "Set default" and "assign default" syntax is
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# not available in busybox (which is used in openwrt firmware) it seems.
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# So work around it with case.
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: ${WIFISIDE:=$(nvram get lan_ifname 2>/dev/null)}
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: ${WIFISIDE:=$(awk '/:/ { gsub(/^ */,""); gsub(/:/," "); print $1; exit 0; }' /proc/net/wireless)}
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HOSTS="$(cat /etc/hosts)"
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ETHERS="$( ( cat /etc/etherss 2>/dev/null; awk '/'$WIFISIDE'$/ { print $4" "$1 }' /proc/net/arp ) | sort -u)"
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for M in $MACS; do
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m=$(echo $M | tr -d ':')
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LABEL=$M
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NAME=''
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IP=$(echo "$ETHERS" | awk '/^'$M'/ { print $2; }')
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case $IP in
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'') :;;
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*) LABEL=$IP
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# Make IP "RE safe"
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IP="$(echo $IP | sed 's/\./\\./g')"
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NAME=$(echo "$HOSTS" | awk '/^'$IP'/ { print $2; }')
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esac
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case $NAME in
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'') :;;
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*) LABEL=$NAME;;
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esac
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echo rssi$m.label $LABEL
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done
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}
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do_autoconf () {
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case $WLERR in
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0) echo yes;;
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127) echo "no ($AL)";;
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*) echo "no (wl error: $AL)";;
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esac
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exit 0
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}
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case $1 in
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''|config|autoconf)
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eval do_$1;;
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esac
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