Send SNMP Traps from a PHP website

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

ActiveSocket features the following protocols: ICMP, HTTP and HTTPs with support for proxy servers, Telnet, NTP time protocol,
RSH remote shell script interface, SNMP (Simple Network Management Protcol), SNMP Traps, Sockets (TCP and UDP), WOL (Wake-On-LAN), and more.

ActiveSocket is compliant with SNMP versions v1 and v2c. Several SNMP data types are supported, including:

ASN_INTEGER; Numeric values;
ASN_INTEGER32; Numeric values;
ASN_BITS; Bit values, for instance: one bit per port to see if a port is connected;
ASN_OCTETSTRING; Byte string;
ASN_NULL; Null value;
ASN_OBJECTIDENTIFIER; Object identifier (OID);
ASN_SEQUENCE; Text string;
ASN_IPADDRESS; IP address;
ASN_COUNTER32; 32 bit counter;
ASN_GAUGE32; 32 bit gauge;
ASN_TIMETICKS; Timestamps or uptime;
ASN_OPAQUE; Byte string;
ASN_COUNTER64; 64 bit counter;
ASN_UNSIGNED32; unsigned 32 bit numeric value.

ActiveSocket supports the following SNMP trap features:

SNMP v1 and SNMP v2c support;
Support for alphanumeric OID's (object identifier) and numeric OID's;
Multithreading architecture: send and/or receive SNMP traps simultaneously from one process using multiple threads;
Support for ports other than the default 161 and 162 ports;
Support for enterprise specific traps;
Support for SNMP v1 generic traps such as coldstart, warmstart, linkup, linkdown, authfailure and neighbourloss;
Send multiple data objects (variable bindings) using a single SNMP trap message.

ActiveSocket can be well integrated into PHP environments.
This document describes how ActiveSocket can be integrated into PHP projects.

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

Step 2: Create an HTML form

First of all we need to collect information from the user.
If we want to send a trap we need to have a host to send the trap to.
We also need to know the community and the SNMP version.

Now that we have that information, we need to find out what kind of trap the user wants to send.
We need to know an OID, a message and the type of the message.
To get this information create a form that looks like this:

(Click on the picture to enlarge)

Step 3: Declare and create the objects

To send SNMP traps using PHP, you need to declare and create the following ActiveSocket objects:

SnmpTrapManager; The SNMP manager which allows you to send and/or receive SNMP traps in the form of SnmpTrap objects;
SnmpTrap; The actual SNMP trap, this object holds some SNMP trap properties like: destination host, port and community, specific and generic trap and a timestamp;
SnmpObject; This object is used to hold the data to be send with the SNMP trap. These data objects are also called variable bindings.

On top of your code, declare the following objects:

<?
   $objSnmpTrapManager = new COM ("ActiveXperts.SnmpTrapManager");
   $objSnmpTrap        = new COM ("ActiveXperts.SnmpTrap");
   $objSnmpObject      = new COM ("ActiveXperts.SnmpObject");
   $objConstants       = new COM ("ActiveXperts.ASConstants");
?>

Step 4: Send an SNMP trap

Now that we have the information we are able to send an SNMP trap.
Now we need to create a trap. If the trap is created it can be sent. The following code shows how to do this:

//******************************************************************************
// function for executing the command
//******************************************************************************

function execute_command($host, $community, $version, $type, $message, $oid, $logfile)
{
 //create the objects
 $objSnmpTrapManager = new COM ("ActiveXperts.SnmpTrapManager");
 $objSnmpTrap        = new COM ("ActiveXperts.SnmpTrap");
 $objSnmpObject      = new COM ("ActiveXperts.SnmpObject");
 $objConstants       = new COM ("ActiveXperts.ASConstants");
  	
 //set logfile
 $objSnmpTrapManager->Logfile = "C:\Snmplogfile.txt";
	
 //initialise SNMP
 $objSnmpTrapManager->Initialize;

 //set version
 $objSnmpTrapManager->ProtocolVersion = $version;

 //set variable data
 $objSnmpObject->Clear();
 $objSnmpObject->OID = "$oid";
					
 //fetch the type and fill in the right type
 switch ($type){

   //if someone fills in "ipaddress":
   case "ipaddress":
   $objSnmpObject->Type = $objConstants->asSNMP_TYPE_IPADDRESS;
   break;
								 
   //if someone fills in "number": 
   case "number":
   $objSnmpObject->Type = $objConstants->asSNMP_TYPE_INTEGER;
   break;
								 
   //if someone fills in "string":
   case "string":
   $objSnmpObject->Type = $objConstants->asSNMP_TYPE_OCTETSTRING;
   break;
					
 //close the switch
 }
					
 $objSnmpObject->Value = "$message";
					
 //create the trap
 $objSnmpTrap->Host = $host;
 $objSnmpTrap->Community = $community;
 $objSnmpTrap->AddObject ( $objSnmpObject ); 

					
 //send it
 $objSnmpTrapManager->Send( $objSnmpTrap );
					
 //and get the error message
 echo "<b>Errorcode:</b> ";
 echo $objSnmpTrapManager->Lasterror; 
 echo " : "; 
 echo $objSnmpTrapManager->geterrordescription($objSnmpTrapManager->Lasterror); 


}

//check if the form is submitted
if($_GET['method'] != ""){
 //execute the command					
 execute_command($_POST['host'], $_POST['community'], $_POST['version'], $_POST['type'], $_POST["value"], $_POST['oid'], $_POST['logfile']);
}

?>

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

The ActiveSocket tool is a Network Communications ActiveX software component (SDK). This control supports SNMP, SMTP, POP3, Telnet, TCP, NTP, RSH, HTTP, HTTPs, FTP, DNS, ICMP and more, and can be used by any Windows development platform, including Visual Basic .NET, Visual CSharp .NET, ASP .NET (VB,CS), ASP, Visual Basic, Visual Studio/Visual C++, Delphi, PHP, ColdFusion, HTML, VBScript and any other ActiveX/COM compliant platform. The ActiveSocket Toolkit is an ActiveXperts Software B.V. Product.