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#!/bin/bash
# _update_every is a special variable - it holds the number of seconds
# between the calls of the _update() function
ap_update_every=
ap_priority=6900
declare -A ap_devs=()
export PATH="${PATH}:/sbin:/usr/sbin:/usr/local/sbin"
# _check is called once, to find out if this chart should be enabled or not
ap_check() {
local ev=$(iw dev | awk '
BEGIN {
i = "";
ssid = "";
ap = 0;
}
/^[ \t]+Interface / {
if( ap == 1 ) {
print "ap_devs[" i "]=\"" ssid "\""
}
i = $2;
ssid = "";
ap = 0;
}
/^[ \t]+ssid / { ssid = $2; }
/^[ \t]+type AP$/ { ap = 1; }
END {
if( ap == 1 ) {
print "ap_devs[" i "]=\"" ssid "\""
}
}
')
eval "${ev}"
# this should return:
# - 0 to enable the chart
# - 1 to disable the chart
[ ${#ap_devs[@]} -gt 0 ] && return 0
return 1
}
# _create is called once, to create the charts
ap_create() {
local ssid dev
for dev in "${!ap_devs[@]}"
do
ssid="${ap_devs[${dev}]}"
# create the chart with 3 dimensions
cat <<EOF
CHART ap_clients.${dev} '' "Connected clients to ${ssid} on ${dev}" "clients" ${dev} ap.clients line $[ap_priority + 1] $ap_update_every
DIMENSION clients '' absolute 1 1
CHART ap_bandwidth.${dev} '' "Bandwidth for ${ssid} on ${dev}" "kilobits/s" ${dev} ap.net area $[ap_priority + 2] $ap_update_every
DIMENSION received '' incremental 8 1024
DIMENSION sent '' incremental -8 1024
CHART ap_packets.${dev} '' "Packets for ${ssid} on ${dev}" "packets/s" ${dev} ap.packets line $[ap_priority + 3] $ap_update_every
DIMENSION received '' incremental 1 1
DIMENSION sent '' incremental -1 1
CHART ap_issues.${dev} '' "Transmit Issues for ${ssid} on ${dev}" "issues/s" ${dev} ap.issues line $[ap_priority + 4] $ap_update_every
DIMENSION retries 'tx retries' incremental 1 1
DIMENSION failures 'tx failures' incremental -1 1
CHART ap_signal.${dev} '' "Average Signal for ${ssid} on ${dev}" "dBm" ${dev} ap.signal line $[ap_priority + 5] $ap_update_every
DIMENSION signal 'average signal' absolute 1 1
CHART ap_bitrate.${dev} '' "Bitrate for ${ssid} on ${dev}" "Mbps" ${dev} ap.bitrate line $[ap_priority + 6] $ap_update_every
DIMENSION receive '' absolute 1 1000
DIMENSION transmit '' absolute -1 1000
DIMENSION expected 'expected throughput' absolute 1 1000
EOF
done
return 0
}
# _update is called continiously, to collect the values
ap_update() {
# the first argument to this function is the microseconds since last update
# pass this parameter to the BEGIN statement (see bellow).
# do all the work to collect / calculate the values
# for each dimension
# remember: KEEP IT SIMPLE AND SHORT
for dev in "${!ap_devs[@]}"
do
iw ${dev} station dump |\
awk "
BEGIN {
c = 0;
rb = 0;
tb = 0;
rp = 0;
tp = 0;
tr = 0;
tf = 0;
tt = 0;
rt = 0;
s = 0;
g = 0;
e = 0;
}
/^Station/ { c++; }
/^[ \\t]+rx bytes:/ { rb += \$3 }
/^[ \\t]+tx bytes:/ { tb += \$3 }
/^[ \\t]+rx packets:/ { rp += \$3 }
/^[ \\t]+tx packets:/ { tp += \$3 }
/^[ \\t]+tx retries:/ { tr += \$3 }
/^[ \\t]+tx failed:/ { tf += \$3 }
/^[ \\t]+signal:/ { s += \$2; }
/^[ \\t]+rx bitrate:/ { x = \$3; rt += x * 1000; }
/^[ \\t]+tx bitrate:/ { x = \$3; tt += x * 1000; }
/^[ \\t]+expected throughput:(.*)Mbps/ {
x=\$3;
sub(/Mbps/, \"\", x);
e += x * 1000;
}
END {
print \"BEGIN ap_clients.${dev}\"
print \"SET clients = \" c;
print \"END\"
print \"BEGIN ap_bandwidth.${dev}\"
print \"SET received = \" rb;
print \"SET sent = \" tb;
print \"END\"
print \"BEGIN ap_packets.${dev}\"
print \"SET received = \" rp;
print \"SET sent = \" tp;
print \"END\"
print \"BEGIN ap_issues.${dev}\"
print \"SET retries = \" tr;
print \"SET failures = \" tf;
print \"END\"
print \"BEGIN ap_signal.${dev}\"
print \"SET signal = \" s / c;
print \"END\"
if( c == 0 ) c = 1;
print \"BEGIN ap_bitrate.${dev}\"
print \"SET receive = \" rt / c;
print \"SET transmit = \" tt / c;
print \"SET expected = \" e / c;
print \"END\"
}
"
done
return 0
}
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