From fe100a499adc91e489823b1f7958f36177f5a305 Mon Sep 17 00:00:00 2001
From: laf <neil@lathwood.co.uk>
Date: Wed, 5 Mar 2014 15:02:04 +0000
Subject: [PATCH] Fix for Cisco kit where match prefix is switched off.

---
 includes/discovery/vlans.inc.php | 17 +++++++++++++++--
 includes/snmp.inc.php            | 18 +++++++++++++++++-
 2 files changed, 32 insertions(+), 3 deletions(-)

diff --git a/includes/discovery/vlans.inc.php b/includes/discovery/vlans.inc.php
index 4d32f510c9c2..3eaec69f1b61 100644
--- a/includes/discovery/vlans.inc.php
+++ b/includes/discovery/vlans.inc.php
@@ -31,9 +31,22 @@
       if ($device['os_group'] == "cisco" || $device['os'] == "ios")  // This shit only seems to work on IOS
       {
         # Probably does not work with snmpv3. I have no real idea about what this code is really doing
+        $device_details = $device;
+        $device_details['snmpcontext'] = $vlan_id;
         $vlan_device = array_merge($device, array('community' => $device['community']."@".$vlan_id));
-        $vlan_data = snmpwalk_cache_oid($vlan_device, "dot1dStpPortEntry", array(), "BRIDGE-MIB:Q-BRIDGE-MIB");
-        $vlan_data = snmpwalk_cache_oid($vlan_device, "dot1dBasePortEntry", $vlan_data, "BRIDGE-MIB:Q-BRIDGE-MIB");
+        $vlan_data = snmpwalk_cache_oid($device_details, "dot1dStpPortEntry", array(), "BRIDGE-MIB:Q-BRIDGE-MIB");
+        if ($exec_response['status'] != 0)
+        {
+          unset($device_details);
+          if( $device['snmpver'] == 'v3')
+          {
+            print_error("ERROR: For 'vlan-' context to work correctly on cisco device with SNMPv3, please add 'match prefix' into snmp config.");
+          } else {
+            print_error("ERROR: No support for per-VLAN community");
+          }
+          break;
+        }
+        $vlan_data = snmpwalk_cache_oid($device_details, "dot1dBasePortEntry", $vlan_data, "BRIDGE-MIB:Q-BRIDGE-MIB");
       }
 
       echo("VLAN $vlan_id \n");
diff --git a/includes/snmp.inc.php b/includes/snmp.inc.php
index c5d0117a682c..ada175c39da2 100644
--- a/includes/snmp.inc.php
+++ b/includes/snmp.inc.php
@@ -765,12 +765,28 @@ function snmp_cache_portName($device, $array)
 function snmp_gen_auth (&$device)
 {
   global $debug;
+  $vlan = FALSE;
+
+  if (isset($device['snmpcontext']))
+  {
+    if (is_numeric($device['snmpcontext']) && $device['snmpcontext'] > 0 && $device['snmpcontext'] < 4096 )
+    {
+      $vlan = $device['snmpcontext'];
+    }
+  }
 
   $cmd = "";
 
   if ($device['snmpver'] === "v3")
   {
-    $cmd = " -v3 -n \"\" -l " . $device['authlevel'];
+    $cmd = " -v3 -l " . $device['authlevel'];
+
+    if(is_numeric($vlan))
+    {
+      $cmd .= ' -n "vlan-' . $vlan . '"';
+    } else {
+      $cmd .= ' -n ""';
+    }
 
     if ($device['authlevel'] === "noAuthNoPriv")
     {