HTML Form SNMP Trap Receiver Sample Source Code
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 MIB Browsing can be well integrated into ASP .NET environments. This document describes how Network Component's SNMP MIB Browser can be integrated into ASP .NET projects.
A management information base (MIB) is a database used to manage the devices in a communications network. The database is hierarchical (tree-structured) and entries are addressed through object identifiers (OID's). A MIB should contain information on these commands and on the target objects (controllable entities or potential sources of status information) with a view to tuning the network transport to the current needs. Each type of object in a MIB database has a name, a syntax, and an encoding. The name is represented uniquely as an OID. An OID is an administratively assigned name. The administrative policies used for assigning names are discussed later in this memo.
Use Network Component's 'SnmpMibBrowser' object to load a MIB database into memory and iterate over all objects and view all properties.
Step 1: Installation of Network Component
Download Network Component from the ActiveXperts Download Site and start the installation. The installation guides you through the installation process.
When using HTML, there are two ways to install the Network Component on a client PC:
- Automatically using HTML code;
- Using the Network Component InstallShield installation.
Automatic installation using HTML code
You can install the Network Component automatically using the following HTML code on top of the HTML page:
<head>
<object codebase="https://www.activexperts.com/files/network-component/3.1/AxNetwork32.cab"
classid="CLSID:B52B14BA-244B-4006-86E0-2923CB69D881" ></object>
</head>
The Network Component will be installated automatically. The user will be asked to confirm the installation, because the DLL is coming from an untrusted site (www.activexperts.com).
There are two ways to avoid prompting:
- Add the ActiveX/COM location to the user's trusted sites. You can manage trusted manually (by using the Internet Explorer), through a logon script (by appyling the registry change from the logon script) or by using Active Directory Group Policies;
- OR use a trusted location for the DLL. For instance your Intranet site, because most probably this site has already been added to the list of trusted sites for all users.
Manual installation using the Network Component installation procedure
On each client PC, download the Network Component from the ActiveXperts Download Site and start the installation. The installation guides you through the installation process.
Step 2: Create the Network Component object in HTML/JavaScript
You must use Javascript to declare and create the objects.
Use the following Javascript code to declare and create the object:
var objSnmpTrapManager; objSnmoMibBrowser = new ActiveXObject ( "AxNetwork.SnmpMibBrowser" );
Appendix: Full source code
<object codebase="https://www.activexperts.com/files/network-component/cab/4.4/axnetwork32.cab" classid="CLSID:B52B14BA-244B-4006-86E0-2923CB69D881" style="visibility: hidden;"></object>
<html>
<head>
<title>ActiveXperts Network Component Sample - SNMP Trap Sender</title>
<style>
.clbody {
font-family:Verdana, Arial, Helvetica, sans-serif;
font-size:9pt;
font-weight:normal;
}
.clfooter {
font-family:Verdana;
font-size:7pt;
font-weight:normal;
}
h1, .h1 {
width:100%;
font-family:Verdana, Arial, Helvetica, sans-serif;
font-size:18px;
font-weight:bold;
}
hr, .hr {
color:#b0b0b0;
}
</style>
<script language="JavaScript" type="text/javascript">
<!--
var objSnmpTrapManager = new ActiveXObject( "AxNetwork.SnmpTrapManager" );
var objConstants = new ActiveXObject( "AxNetwork.NwConstants" );
function getInfo()
{
document.getElementById("fldAxNetworkInfo").innerHTML = "Build: " + objSnmpTrapManager.Build + "; Module: " + objSnmpTrapManager.Module
}
function SendTrap()
{
var objForm = document.forms["AXForm"];
var numLastError = 0;
var strLastError = "";
// Set Protocol (v1 or v2c)
var selectedValue = objForm.CTL_PROTOCOL[objForm.CTL_PROTOCOL.selectedIndex].value;
if( selectedValue == "SNMP v1" )
{
objSnmpTrapManager.ProtocolVersion = objConstants.nwSNMP_VERSION_V1;
}
else
{
objSnmpTrapManager.ProtocolVersion = objConstants.nwSNMP_VERSION_V2C;
}
objSnmpTrapManager.Initialize();
numLastError = objSnmpTrapManager.LastError;
if( numLastError == 0 )
{
objSnmpTrap = new ActiveXObject( "AxNetwork.SnmpTrap" );
objSnmpObject = new ActiveXObject( "AxNetwork.SnmpObject" );
objSnmpTrap.Clear();
objSnmpTrap.Host = objForm.CTL_AGENT.value;
objSnmpTrap.Community = objForm.CTL_COMMUNITY.value;
objSnmpTrap.Port = objForm.CTL_PORT.value;
// Add variable to trap
objSnmpObject.Clear();
objSnmpObject.OID = objForm.CTL_OID.value;
objSnmpObject.Type = GetTypeCode(objForm.CTL_TYPE.value);
objSnmpObject.Value = objForm.CTL_VALUE.value;
objSnmpTrap.AddObject( objSnmpObject );
numLastError = objSnmpTrap.LastError;
}
if( numLastError == 0 )
{
objSnmpTrapManager.Send( objSnmpTrap );
numLastError = objSnmpTrapManager.LastError;
}
strLastError = objSnmpTrapManager.GetErrorDescription( numLastError );
objSnmpTrapManager.Shutdown();
objForm.CTL_RESULT.value = numLastError + ": " + strLastError;
}
function GetTypeString(lType)
{
var strResult = "";
switch ( lType )
{
case objConstants.nwSNMP_TYPE_INTEGER32: strResult = "nwSNMP_TYPE_INTEGER32"; break;
case objConstants.nwSNMP_TYPE_BITS: strResult = "nwSNMP_TYPE_BITS"; break;
case objConstants.nwSNMP_TYPE_OCTETSTRING: strResult = "nwSNMP_TYPE_OCTETSTRING"; break;
case objConstants.nwSNMP_TYPE_NULL: strResult = "nwSNMP_TYPE_NULL"; break;
case objConstants.nwSNMP_TYPE_OBJECTIDENTIFIER: strResult = "nwSNMP_TYPE_OBJECTIDENTIFIER"; break;
case objConstants.nwSNMP_TYPE_SEQUENCE: strResult = "nwSNMP_TYPE_SEQUENCE"; break;
case objConstants.nwSNMP_TYPE_IPADDRESS: strResult = "nwSNMP_TYPE_IPADDRESS"; break;
case objConstants.nwSNMP_TYPE_COUNTER32: strResult = "nwSNMP_TYPE_COUNTER32"; break;
case objConstants.nwSNMP_TYPE_GAUGE32: strResult = "nwSNMP_TYPE_GAUGE32"; break;
case objConstants.nwSNMP_TYPE_TIMETICKS: strResult = "nwSNMP_TYPE_TIMETICKS"; break;
case objConstants.nwSNMP_TYPE_OPAQUE: strResult = "nwSNMP_TYPE_OPAQUE"; break;
case objConstants.nwSNMP_TYPE_COUNTER64: strResult = "nwSNMP_TYPE_COUNTER64"; break;
case objConstants.nwSNMP_TYPE_UNSIGNED32: strResult = "nwSNMP_TYPE_UNSIGNED32"; break;
}
return strResult
}
function GetTypeCode( strType )
{
var strResult = objConstants.nwSNMP_TYPE_UNDEFINED;
switch( strType )
{
case "nwSNMP_TYPE_INTEGER32": strResult = objConstants.nwSNMP_TYPE_INTEGER32; break;
case "nwSNMP_TYPE_BITS": strResult = objConstants.nwSNMP_TYPE_BITS; break;
case "nwSNMP_TYPE_OCTETSTRING": strResult = objConstants.nwSNMP_TYPE_OCTETSTRING; break;
case "nwSNMP_TYPE_NULL": strResult = objConstants.nwSNMP_TYPE_NULL; break;
case "nwSNMP_TYPE_OBJECTIDENTIFIER": strResult = objConstants.nwSNMP_TYPE_OBJECTIDENTIFIER; break;
case "nwSNMP_TYPE_SEQUENCE": strResult = objConstants.nwSNMP_TYPE_SEQUENCE; break;
case "nwSNMP_TYPE_IPADDRESS": strResult = objConstants.nwSNMP_TYPE_IPADDRESS; break;
case "nwSNMP_TYPE_COUNTER32": strResult = objConstants.nwSNMP_TYPE_COUNTER32; break;
case "nwSNMP_TYPE_GAUGE32": strResult = objConstants.nwSNMP_TYPE_GAUGE32; break;
case "nwSNMP_TYPE_TIMETICKS": strResult = objConstants.nwSNMP_TYPE_TIMETICKS; break;
case "nwSNMP_TYPE_OPAQUE": strResult = objConstants.nwSNMP_TYPE_OPAQUE; break;
case "nwSNMP_TYPE_COUNTER64": strResult = objConstants.nwSNMP_TYPE_COUNTER64; break;
case "nwSNMP_TYPE_UNSIGNED32": strResult = objConstants.nwSNMP_TYPE_UNSIGNED32; break;
}
return strResult;
}
//-->
</script>
</head>
<body onload="getInfo()">
<h1>ActiveXperts Network Component Sample - SNMP Trap Sender Demo</h1>
<hr size="1">
<form name="AXForm">
<table class ="clbody">
<tr>
<td valign="top">Component:</td>
<td valign="top"><span id="fldAxNetworkInfo"></span></td>
</tr>
<tr>
<td valign="top">Remote Agent:</td>
<td valign="top">
<input style="width: 300px" type="text" name="CTL_AGENT" value="localhost">
:<input style="width: 50px" type="text" name="CTL_PORT" value="162">
</td>
</tr>
<tr>
<td valign="top">Community:</td>
<td valign="top"><input style="width: 300px" type="text" name="CTL_COMMUNITY" value="public"></td>
</tr>
<tr>
<td valign="top">Protocol version:</td>
<td valign="top">
<select name="CTL_PROTOCOL" style="width: 300px">
<option value="SNMP v1">SNMP v1</option>
<option value="SNMP v2c" selected>SNMP v2c</option>
</select>
</td>
</tr>
<tr>
<td valign="top">Send OID (Object ID):</td>
<td valign="top"><input style="width: 500px" type="text" name="CTL_OID" value="system.sysDescr.0"></td>
</tr>
<tr>
<td valign="top">Send Data Type:</td>
<td valign="top">
<select name="CTL_TYPE" style="width: 300px">
<option value="nwSNMP_TYPE_UNDEFINED">nwSNMP_TYPE_UNDEFINED</option>
<option value="nwSNMP_TYPE_INTEGER32">nwSNMP_TYPE_INTEGER32</option>
<option value="nwSNMP_TYPE_BITS">nwSNMP_TYPE_BITS</option>
<option value="nwSNMP_TYPE_OCTETSTRING" selected>nwSNMP_TYPE_OCTETSTRING</option>
<option value="nwSNMP_TYPE_NULL">nwSNMP_TYPE_NULL</option>
<option value="nwSNMP_TYPE_OBJECTIDENTIFIER">nwSNMP_TYPE_OBJECTIDENTIFIER</option>
<option value="nwSNMP_TYPE_SEQUENCE">nwSNMP_TYPE_SEQUENCE</option>
<option value="nwSNMP_TYPE_IPADDRESS">nwSNMP_TYPE_IPADDRESS</option>
<option value="nwSNMP_TYPE_COUNTER32">nwSNMP_TYPE_COUNTER32</option>
<option value="nwSNMP_TYPE_GAUGE32">nwSNMP_TYPE_GAUGE32</option>
<option value="nwSNMP_TYPE_TIMETICKS">nwSNMP_TYPE_TIMETICKS</option>
<option value="nwSNMP_TYPE_OPAQUE">nwSNMP_TYPE_OPAQUE</option>
<option value="nwSNMP_TYPE_COUNTER64">nwSNMP_TYPE_COUNTER64</option>
<option value="nwSNMP_TYPE_UNSIGNED32">nwSNMP_TYPE_UNSIGNED32</option>
<option value="nwSNMP_TYPE_COUNTER64">nwSNMP_TYPE_COUNTER64</option>
</select>
</td>
</tr>
<tr>
<td valign="top">Send Data Value:</td>
<td valign="top"><input style="width: 500px" type="text" name="CTL_VALUE" value="A system description"></td>
</tr>
<tr>
<td valign="top"> </td>
<td valign="top"><input size="25" type="button" onclick="SendTrap()" value="Send Trap" name="CTL_SENDTRAP" style="height: 23px; width: 500px"></td>
</tr>
<tr>
<td valign="top"> </td>
<td valign="top"> </td>
</tr>
<tr>
<td valign="top">Result code:</td>
<td valign="top"><input type="text" name="CTL_RESULT" disabled="true" style="border:0px;width:500px;"></td>
</tr>
</table>
<br>
<br>
</form>
<hr size="1">
<div>
This sample is based on ActiveXperts Network Component, an <a target="_blank" href="https://www.activexperts.com">ActiveXperts Software</a> product.<br>
<a href="../Index.htm">Click here</a> to return to the HTML sample menu page.<br>
</div>
</body>
</html>
You can download the complete samples here. There are many other working Network Component scripts on our site and shipped with the product.