VBScript SNMP Sample Source Code

ActiveSocket provides an easy-to-use development interface to a variety of IP protocols. By using ActiveSocket, you can very easily create or enhance applications with network features.

ActiveSocket features the following: DNS, FTP, HTTP, HTTPs, ICMP Ping, IP-to-Country, MSN, NTP, RSH, SCP, SFTP, SNMP v1/v2c (Get, GetNext, Set), SNMP Traps, SNMP MIB, SSH, TCP, Telnet, TFTP, UDP, Telnet, Wake-On-LAN and more.

SNMP can be well integrated into VBScript environments.

This document describes how ActiveSocket's SNMP objects can be integrated into VBScript code.

ActiveSocket is compliant with SNMP v1 and SNMP v2c. ActiveSocket automatically detects which SNMP version is running on the remote agent. Different SNMP data types, including:

String types (also called "octet strings");
Integer types (16bit, 32bit, 64bit and unsigned integers);
IP Address types;
Timetick types;
Counter types (32bit and 64bit counters);
OID types (also called "Object ID's");
Other, less frequently used datatypes.

The following operations are supported:

Get - retrieve an object variable from the (remote) agent;
GetNext - retrieve the next object variable from a table or list within an agent;
Set - set values for object variables within an agent.

Prerequisites

IMPORTANT: Make sure that the SNMP Service is installed and running on the machine where ActiveSocket is installed. For more details, please read FAQ items Q1200010 and Q1200015.

Step 1: Download and install the ActiveSocket Toolkit

Download ActiveSocket from the ActiveXperts Download Site and start the installation. The installation guides you through the installation process.

Step 2: Create a new script

Create a new script using your favorite editor. You can simply use notepad. However, a VBScript editor is recommended, so you can browse through objects, objects properties and object functions.

You're now able to write a more advanced script to communicate using the ActiveSocket Toolkit.

Step 3: Create the ActiveSocket object in VBScript

Create a new VBScript file called DEMO.VBS. It is recommended to insert the following line on top of your code:

Option Explicit

This statement requires that all variable names be defined (with the Dim statement), to avoid simple typos that can cause incredible headaches and long debugging sessions for something that should have never happened.

Now, declare the ActiveSocket object(s):

Dim objSnmpManager

Create the ActiveSocket object(s) like this:

Set objSnmpManager      = CreateObject( "ActiveXperts.SnmpManager" )

Now, add the following lines to the file to have your fist ActiveSocket VBScript program:

WScript.Echo "Version: " & objSocket.Version
WScript.Echo "Expiration Date: " & objSocket.Expiration Date

Step 4: Execute an SNMP query on a remote SNMP agent

You can now query SNMP OID's.

The following VBScript code shows how to execute an SNMP query on a remote SNMP agent:

Option Explicit

Dim objSnmpManager
Dim objSnmpData
Dim objConstants
Dim strHostName, strCommunity, strValue, strOID

' Create SnmpManager and ASConstants instances
Set objSnmpManager     = CreateObject ( "ActiveXperts.SnmpManager" )
Set objConstants       = CreateObject ( "ActiveXperts.ASConstants" )

' Write version information and expiration date
WScript.Echo "ActiveSocket " & objSnmpManager.Version & " demo."
WScript.Echo "Expiration date: " & objSnmpManager.ExpirationDate & vbCrLf

' Get Host and communicaty name
Do
   strHostName  = inputbox( "Enter the hostname (a remote or local hostname)", "Input", "localhost" )
Loop until strHostName <> ""
Do
   strCommunity = inputbox( "Enter community", "Input", "public" )
Loop until strCommunity <> ""

' Initialize SNMP
objSnmpManager.Initialize

WScript.Echo "Initialize: " & objSnmpManager.LastError & " (" & objSnmpManager.GetErrorDescription( objSnmpManager.LastError ) & ")"
WScript.Echo

If( objSnmpManager.LastError <> 0 ) Then
   WScript.Quit
End If

' Open SNMP session. Pass hostname and community. 
' Note: Port 161 is used. To specify  a different port, pass the port number as 3rd parameter (optional) 
objSnmpManager.Open strHostName, strCommunity

WScript.Echo "Open( " & strHostName & ", " & Chr(34) & strCommunity & Chr(34) & " ): " & objSnmpManager.LastError & " (" & objSnmpManager.GetErrorDescription( objSnmpManager.LastError ) & ")"
WScript.Echo

If( objSnmpManager.LastError = 0 ) Then

   strOID = "system.sysDescr.0"
    
   Set objSnmpData = objSnmpManager.Get( strOID )
   WScript.Echo "Get( " & strOID & ", " & Chr(34) & strCommunity & Chr(34) & " ): " & objSnmpManager.LastError & " (" & objSnmpManager.GetErrorDescription( objSnmpManager.LastError ) & ")" & vbCrLf
   If( objSnmpManager.LastError = 0 ) Then
      PrintSnmpData( objSnmpData )
   End If

   strOID = "system.sysName.0"	

   Set objSnmpData = objSnmpManager.Get( strOID )
   WScript.Echo "Get( " & strOID & ", " & Chr(34) & strCommunity & Chr(34) & " ): " & objSnmpManager.LastError & " (" & objSnmpManager.GetErrorDescription( objSnmpManager.LastError ) & ")" & vbCrLf
   If( objSnmpManager.LastError = 0 ) Then
      PrintSnmpData( objSnmpData )
   End If

   strOID = "system.sysUpTime.0"	

   Set objSnmpData = objSnmpManager.Get( strOID )
   WScript.Echo "Get( " & strOID & ", " & Chr(34) & strCommunity & Chr(34) & " ): " & objSnmpManager.LastError & " (" & objSnmpManager.GetErrorDescription( objSnmpManager.LastError ) & ")" & vbCrLf
   If( objSnmpManager.LastError = 0 ) Then
      PrintSnmpData( objSnmpData )
   End If

   objSnmpManager.Close()
   WScript.Echo "Close(): " & objSnmpManager.LastError & " (" & objSnmpManager.GetErrorDescription( objSnmpManager.LastError ) & ")"
   WScript.Echo

End If

' Shutdown SNMP session
objSnmpManager.Shutdown
WScript.Echo "Shutdown(): " & objSnmpManager.LastError & " (" & objSnmpManager.GetErrorDescription( objSnmpManager.LastError ) & ")"
WScript.Echo

WScript.Echo "Ready."

' ********************************************************************
'  Function PrintSnmpData
' ********************************************************************
Function PrintSnmpData( objSnmpData )
   WScript.Echo "    OID   : " & objSnmpData.OID
   WScript.Echo "    Value : " & objSnmpData.Value
   WScript.Echo "    Type  : " & GetTypeString( objSnmpData.Type )
   WScript.Echo
End Function

' ********************************************************************
'  Function GetTypeString()
' ********************************************************************
Function GetTypeString( lType )
   Select Case lType
     Case objConstants.asSNMP_TYPE_INTEGER32: 
        GetTypeString = "asSNMP_TYPE_INTEGER32"
     Case objConstants.asSNMP_TYPE_BITS 
        GetTypeString = "asSNMP_TYPE_BITS"
     Case objConstants.asSNMP_TYPE_OCTETSTRING 
        GetTypeString = "asSNMP_TYPE_OCTETSTRING"
     Case objConstants.asSNMP_TYPE_NULL 
        GetTypeString = "asSNMP_TYPE_NULL"
     Case objConstants.asSNMP_TYPE_OBJECTIDENTIFIER
        GetTypeString = "asSNMP_TYPE_OBJECTIDENTIFIER"
     Case objConstants.asSNMP_TYPE_SEQUENCE 
        GetTypeString = "asSNMP_TYPE_SEQUENCE"
     Case objConstants.asSNMP_TYPE_IPADDRESS 
        GetTypeString = "asSNMP_TYPE_IPADDRESS"
     Case objConstants.asSNMP_TYPE_COUNTER32 
        GetTypeString = "asSNMP_TYPE_COUNTER32"
     Case objConstants.asSNMP_TYPE_GAUGE32
        GetTypeString = "asSNMP_TYPE_GAUGE32"
     Case objConstants.asSNMP_TYPE_TIMETICKS 
        GetTypeString = "asSNMP_TYPE_TIMETICKS"
     Case objConstants.asSNMP_TYPE_OPAQUE 
        GetTypeString = "asSNMP_TYPE_OPAQUE"
     Case objConstants.asSNMP_TYPE_COUNTER64
        GetTypeString = "asSNMP_TYPE_COUNTER64"
     Case objConstants.asSNMP_TYPE_UNSIGNED32 
        GetTypeString = "asSNMP_TYPE_UNSIGNED32"
     Case Else 
        GetTypeString= "UNKNOWN" 
   End Select 
End Function

There are many working samples included with the product. You can also find them on the ActiveXperts FTP site: ftp.activexperts-labs.com/samples/network-component.

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