ActiveXperts Network Component

Quicklinks

How to use SNMP in VBScript

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

Network Component 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.

Network Component can be well integrated into any development platform that supports ActiveX objects.


SNMP can be well integrated into ASP .NET (Visual Basic) environments.

This document describes how Network Component's SNMP objects can be integrated into ASP .NET (Visual Basic) projects.

Network Component is compliant with SNMP v1 and SNMP v2c. Different SNMP data types are supported, 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.

Step 1: Download and install the Network Component

Download Network Component 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 Network Component.

Step 3: Create the Network Component 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 Network Component object(s):

Dim objSnmp

Create the Network Component object(s) like this:

Set objSnmp = CreateObject( "AxNetwork.Snmp" )

Now, add the following lines to the file to have your first Network Component VBScript program:

WScript.Echo "Version: " & objSnmp.Version
WScript.Echo "License Status: " & objSnmp.LicenseStatus

Appendix: Full source code

' ********************************************************************
' ActiveXperts Network Component sample - SNMP Walk (Get/GetNext)
'   
' Written by ActiveXperts Software 
'     http://www.activexperts.com
' ********************************************************************

Option Explicit

Dim objSnmpManager, objSnmpObject, objConstants

Dim strCommunity,strOID, strNextOID, fso
Dim strMibFile, strHostName, strValue

' Create instances of the objects
Set objSnmpManager  = CreateObject( "AxNetwork.SnmpManager" )
Set objConstants    = CreateObject( "AxNetwork.NwConstants" )

' A license key is required to unlock this component after the trial period has expired.
' Call 'Activate' with a valid license key as its first parameter. Second parameter determines whether to save the license key permanently 
' to the registry (True, so you need to call Activate only once), or not to store the key permanently (False, so you need to call Activate
' every time the component is created). For details, see manual, chapter "Product Activation".
'
' objSnmpManager.Activate "XXXXX-XXXXX-XXXXX", False

' Component info
Wscript.Echo "ActiveXpert Network Component " & objSnmpManager.Version
Wscript.Echo "Build: " & objSnmpManager.Build & vbCrLf & "Module: " & objSnmpManager.Module
Wscript.Echo "License Status: " & objSnmpManager.LicenseStatus & vbCrLf & "License Key: " & objSnmpManager.LicenseKey & vbCrLf

' Set Logfile
Set fso = CreateObject( "Scripting.FileSystemObject" )
objSnmpManager.LogFile = fso.GetSpecialFolder(2) & "\SnmpManager.log"
WScript.Echo "Log file: " & objSnmpManager.LogFile & vbCrLf

' Get Host, community name and optionally a MIB file
strHostName    = ReadInput( "Enter the hostname (a remote or local hostname)", "192.168.31.12", False )
strMibFile     = ReadInput( "Enter location of MIB file (optional, only required when using alpha-numeric OID's)", "c:\windows\system32\hostmib.mib", True )

' Set SNMP protocol version (V1, V2C or V3)
objSnmpManager.ProtocolVersion = objConstants.nwSNMP_VERSION_V3

' Set SNMPv3 authentication credentials (SHA1 or MD5)
objSnmpManager.AuthProtocol	= objConstants.nwSNMP_AUTH_SHA1
objSnmpManager.AuthUsername	= "user"
objSnmpManager.AuthPassword = "password1"

'Set SNMPv3 encryption credentials (DES or AES)
objSnmpManager.PrivProtocol = objConstants.nwSNMP_PRIV_DES
objSnmpManager.PrivPassword = "password2"

' Initialize SNMP
objSnmpManager.Initialize
WScript.Echo "Initialize, result: " & objSnmpManager.LastError & " (" & objSnmpManager.GetErrorDescription( objSnmpManager.LastError ) & ")"
If( objSnmpManager.LastError <> 0 ) Then
   WScript.Quit
End If


If( strMibFile <> "" ) Then
   objSnmpManager.LoadMibFile( strMibFile )
End If

' Open SNMP session. Pass hostname and community. 
' Note: Port 161 is used by default. 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 ) & ")"
If( objSnmpManager.LastError = 0 ) Then

   strOID = "snmp.snmpInPkts.0"
   
   If( objSnmpManager.LastError = 0 ) Then
      Set objSnmpObject = objSnmpManager.Get( strOID )
	  While( objSnmpManager.LastError = 0 )
         PrintSnmpObject( objSnmpObject )
         On Error Resume Next
         Set objSnmpObject = objSnmpManager.GetNext()
      WEnd

      objSnmpManager.Close()
      WScript.Echo "Close, result: " & objSnmpManager.LastError & " (" & objSnmpManager.GetErrorDescription( objSnmpManager.LastError ) & ")"
   End If
End If

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

WScript.Echo "Ready."


' ***************************************************************************
' Function ReadInput
' ***************************************************************************
Function ReadInput( ByVal strTitle, ByVal strDefault, ByVal bAllowEmpty )

   Dim strInput, strReturn
   
   Do
      strInput = inputbox( strTitle, "Enter value", strDefault )
      If ( strInput <> "" ) Then
         strReturn = strInput
      End If
   Loop until strReturn <> "" Or bAllowEmpty
   
   ReadInput = strReturn
End Function


' ********************************************************************
'  Function PrintSnmpData
' ********************************************************************
Function PrintSnmpObject( objSnmpObject )
   WScript.Echo "OID     : " & objSnmpObject.OID
   WScript.Echo "  Name  :" & objSnmpObject.OIDName
   WScript.Echo "  Type  :" &  GetTypeString( objSnmpObject.Type )
   WScript.Echo "  Value :" & objSnmpObject.Value
End Function


' ********************************************************************
'  Function GetTypeString()
' ********************************************************************
Function GetTypeString( lType )
   Select Case lType
     Case objConstants.nwSNMP_TYPE_INTEGER32: 
        GetTypeString = "nwSNMP_TYPE_INTEGER32"
     Case objConstants.nwSNMP_TYPE_BITS 
        GetTypeString = "nwSNMP_TYPE_BITS"
     Case objConstants.nwSNMP_TYPE_OCTETSTRING 
        GetTypeString = "nwSNMP_TYPE_OCTETSTRING"
     Case objConstants.nwSNMP_TYPE_NULL 
        GetTypeString = "nwSNMP_TYPE_NULL"
     Case objConstants.nwSNMP_TYPE_OBJECTIDENTIFIER
        GetTypeString = "nwSNMP_TYPE_OBJECTIDENTIFIER"
     Case objConstants.nwSNMP_TYPE_SEQUENCE 
        GetTypeString = "nwSNMP_TYPE_SEQUENCE"
     Case objConstants.nwSNMP_TYPE_IPADDRESS 
        GetTypeString = "nwSNMP_TYPE_IPADDRESS"
     Case objConstants.nwSNMP_TYPE_COUNTER32 
        GetTypeString = "nwSNMP_TYPE_COUNTER32"
     Case objConstants.nwSNMP_TYPE_GAUGE32
        GetTypeString = "nwSNMP_TYPE_GAUGE32"
     Case objConstants.nwSNMP_TYPE_TIMETICKS 
        GetTypeString = "nwSNMP_TYPE_TIMETICKS"
     Case objConstants.nwSNMP_TYPE_OPAQUE 
        GetTypeString = "nwSNMP_TYPE_OPAQUE"
     Case objConstants.nwSNMP_TYPE_COUNTER64
        GetTypeString = "nwSNMP_TYPE_COUNTER64"
     Case objConstants.nwSNMP_TYPE_UNSIGNED32 
        GetTypeString = "nwSNMP_TYPE_UNSIGNED32"
     Case Else 
        GetTypeString= "UNKNOWN" 
   End Select 
End Function


You can download the complete sample on our FTP site ftp.activexperts-labs.com/samples/network-component/. There are many other working Network Component scripts on our site and shipped with the product.