From 2d2d3d609f4e1c2e658cbf6e16927797b026c97f Mon Sep 17 00:00:00 2001
From: Phil! Gold <phil_g@pobox.com>
Date: Thu, 12 Aug 2010 22:56:09 +0200
Subject: [PATCH] Initial version

---
 plugins/other/snmp__linksys_poe | 114 ++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100755 plugins/other/snmp__linksys_poe

diff --git a/plugins/other/snmp__linksys_poe b/plugins/other/snmp__linksys_poe
new file mode 100755
index 00000000..c3fa6b88
--- /dev/null
+++ b/plugins/other/snmp__linksys_poe
@@ -0,0 +1,114 @@
+#!/usr/bin/ruby
+
+"
+=head1 NAME
+
+snmp__linksys_poe - Munin plugin to monitor the current supplied by Linksys PoE
+switches.
+
+Requires ruby and the ruby SNMP library.
+
+=head1 APPLICABLE SYSTEMS
+
+I wrote this to query SRW2008MP switches and determined the OIDs by trial and
+error.  There may be other Linksys devices that this will also work for.
+
+=head1 CONFIGURATION
+
+This plugin defaults to SNMP version 2c and a community string of 'public'.  The
+defaults can be overridden in the usual way:
+
+    [snmp_*]
+        env.version 1
+        env.community private
+
+SNMP version 3 is not supported.
+
+=head1 INTERPRETATION
+
+The plugin simply reports the current being supplied on each of the device's
+PoE ports.
+
+=head1 MIB INFORMATION
+
+Information is gathered from Linksys' private MIB space, so it's probably only
+applicable to Linksys devices.  I have been unable to get an actual copy of
+the appropriate MIB, so I don't know the actual names of the values I'm 
+retrieving.
+
+=head1 MAGIC MARKERS
+
+  #%# family=snmpauto contrib
+  #%# capabilities=snmpconf
+
+=head1 VERSION
+
+  1.0
+
+=head1 BUGS
+
+None known.
+
+=head1 AUTHOR
+
+Written by Phil Gold <phil_g@pobox.com>.
+
+=head1 LICENSE
+
+CC0 <http://creativecommons.org/publicdomain/zero/1.0/>
+
+To the extent possible under law, all copyright and related or neighboring
+rights to this plugin are waived.  Do with it as you wish.
+
+=cut
+"
+
+require 'snmp'
+
+idx_oid = "enterprises.3955.89.108.1.1.2"
+max_oid = "enterprises.3955.89.108.1.1.6"
+cur_oid = "enterprises.3955.89.108.1.1.5"
+
+community = ENV['community'] || "public"
+version = ENV['version'] == '1' ? :SNMPv1 : :SNMPv2c
+
+case ARGV[0]
+when "autoconf"
+  puts "no"
+  exit 1
+when "snmpconf"
+  puts "require 1.3.6.1.4.1.3955.89.108.1.1.2.1. [0-9]"
+  puts "require 1.3.6.1.4.1.3955.89.108.1.1.5.1. [0-9]"
+  puts "require 1.3.6.1.4.1.3955.89.108.1.1.6.1. [0-9]"
+  exit 0;
+when "config"
+  host = $0.match('^(?:|.*\/)snmp_([^_]+)')[1]
+  puts "host_name #{host}"
+  puts "graph_title PoE Power Usage"
+  puts "graph_vlabel Watts"
+  puts "graph_category sensors"
+  max_current = 0
+  SNMP::Manager.open(:Host => host,
+                     :Community => community,
+                     :Version => version) do |manager|
+    manager.walk([idx_oid, max_oid]) do |row|
+      puts "iface_#{row[0].value}.label Port #{row[0].value}"
+      puts "iface_#{row[0].value}.cdef iface_#{row[0].value},1000,/"
+      puts "iface_#{row[0].value}.line #{row[1].value.to_f / 1000}"
+      if row[1].value > max_current
+        max_current = row[1].value
+      end
+    end
+  end
+  puts "graph_args --upper-limit #{max_current.to_f / 1000}"
+  exit 0
+else
+  host = $0.match('^(?:|.*\/)snmp_([^_]+)')[1]
+  SNMP::Manager.open(:Host => host,
+                     :Community => community,
+                     :Version => version) do |manager|
+    manager.walk([idx_oid, cur_oid]) do |row|
+      puts "iface_#{row[0].value}.value #{row[1].value}"
+    end
+  end
+end