From 4bc2b626105dd02115cba2f4b1a7f5e39d0be1df Mon Sep 17 00:00:00 2001
From: "Kim B. Heino" <b@bbbs.net>
Date: Wed, 7 Oct 2020 13:16:35 +0300
Subject: [PATCH] wireless: add new plugin to get info about OpenWRT's APs

Following info is returned, per AP:
- Signal strength (dBm)
- Number of associated clients
---
 Makefile         |  2 +-
 muninlite.in     |  5 +++++
 plugins/wireless | 38 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+), 1 deletion(-)
 create mode 100644 plugins/wireless

diff --git a/Makefile b/Makefile
index 016f715..e96ae3a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-PLUGINS ?= df cpu if_ if_err_ load memory processes swap netstat uptime interrupts irqstats ntpdate plugindir_
+PLUGINS ?= df cpu if_ if_err_ load memory processes swap netstat uptime interrupts irqstats ntpdate wireless plugindir_
 CONFIGURATION_FILE ?= muninlite.conf
 INPUT_FILE ?= muninlite.in
 TARGET_FILE ?= muninlite
diff --git a/muninlite.in b/muninlite.in
index e9e421f..003b2c6 100755
--- a/muninlite.in
+++ b/muninlite.in
@@ -86,6 +86,11 @@ for PLUG in $PLUGINS; do
         RES="$RES netstat"
       fi
       ;;
+    wireless)
+      if iwinfo >/dev/null 2>&1; then
+          RES="${RES} ${PLUG}"
+      fi
+      ;;
     plugindir_)
       for MYPLUGIN in $(if [ -d "$PLUGIN_DIRECTORY" ]; then find -L "$PLUGIN_DIRECTORY" -type f -name "$PLUGINPATTERN"; fi); do
         if [ -f "$MYPLUGIN" ] && [ -x "$MYPLUGIN" ]; then
diff --git a/plugins/wireless b/plugins/wireless
new file mode 100644
index 0000000..f9de52f
--- /dev/null
+++ b/plugins/wireless
@@ -0,0 +1,38 @@
+config_wireless() {
+  interfaces=$(iwinfo 2> /dev/null | sed '/^wlan/!d; s/ .*//g; /-/d')
+  for interface in ${interfaces}
+  do
+    echo "multigraph wireless_${interface}
+graph_title WLAN ${interface} AP Statistics
+graph_vlabel Strength (dBm)
+graph_category network
+graph_scale no
+signal.label Signal
+noise.label Noise"
+  done
+  interfaces=$(iwinfo 2> /dev/null | sed '/^wlan/!d; s/ .*//g')
+  for interface in ${interfaces}
+  do
+    echo "multigraph wireless_assoc_${interface/-/_}
+graph_title WLAN ${interface} associations
+graph_vlabel Clients
+graph_args --lower-limit 0
+graph_category network
+graph_scale no
+clients.label Clients"
+  done
+}
+fetch_wireless() {
+  interfaces=$(iwinfo 2> /dev/null | sed '/^wlan/!d; s/ .*//g; /-/d')
+  for interface in ${interfaces}
+  do
+    echo "multigraph wireless_${interface}"
+    iwinfo ${interface} info | sed -r 's/unknown/0 dBm/g; /Signal.*Noise/!d; s/^.* Signal: ([-0-9]+) dBm  Noise: ([-0-9]+) dBm/signal.value \1\nnoise.value \2/'
+  done
+  interfaces=$(iwinfo 2> /dev/null | sed '/^wlan/!d; s/ .*//g')
+  for interface in ${interfaces}
+  do
+    echo "multigraph wireless_assoc_${interface/-/_}"
+    echo "clients.value $(iwinfo ${interface} assoc | grep -c SNR)"
+  done
+}