ActiveSocket Toolkit Add network capabilities to any Windows or .NET application

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Visual C++ 5.x/6.x SNMP Trap Sender Source Code

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: 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.

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 Visual C++ environments. This document describes how ActiveSocket can be integrated into Visual C++ 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 a new Visual C++ project

Launch 'Microsoft Visual C++' from the Start menu, and choose 'New' from the 'File Menu'. The 'New' dialog appears.

Select the type of project (for instance: 'Win32 Console Application'), enter a 'Project name' and select the 'Location':

(Click on the picture to enlarge)

Select the kind of project, for instance a 'Hello, world!' application and click 'Finish':

(Click on the picture to enlarge)

Step 3: Refer to the ActiveSocket Library

A new Project is created now.

Before you can use ActiveSocket, you need to refer to the ActiveSocket library.

The actually reference files are shipped with the product and are located in the following directory:

C:\Program Files\ActiveXperts\ActiveSocket\Examples\Visual C++\Include

Copy all files in the above directory ('ASocket.h', 'ASocket_i.c' and 'ASocketConstants.h') to your project directory.

Step 4: Declare and create the objects

To send SNMP traps using Visual C++, 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:

ISnmpTrapManager    *m_pSnmpTrapManager   = NULL;
ISnmpTrap           *m_pSnmpTrap          = NULL;
ISnmpObject         *m_pSnmpObject        = NULL;

Since the ActiveSocket Toolkit is a COM object, you must initialize the COM library before you can call COM library functions (e.g. ActiveSocket functions):

CoInitialize(NULL);

Create the objects in the following way:

CoCreateInstance(CLSID_SnmpTrapManager, NULL, CLSCTX_INPROC_SERVER, IID_ISnmpTrapManager, (void**) &m_pSnmpTrapManager );
CoCreateInstance(CLSID_SnmpTrap, NULL, CLSCTX_INPROC_SERVER, IID_ISnmpTrap, (void**) &m_pSnmpTrap );
CoCreateInstance(CLSID_SnmpObject, NULL, CLSCTX_INPROC_SERVER, IID_ISnmpObject, (void**) &m_pSnmpObject );

Step 5: Sending a trap

When the required SNMP objects are created, you can implement the code to send a SNMP trap:

#include <comdef.h>

void CDlgSnmpTrap::OnButtonSendtrap() 
{
    UpdateData( TRUE );

    if( m_pManager == NULL )
       return;

    m_pManager->put_LogFile ( _bstr_t ( ( LPCTSTR ) m_strLogFile ) );

    if( m_strSendTranslationMode == "SNMP v1" )
        m_pManager->put_ProtocolVersion( asSNMP_VERSION_V1 );
    else
        m_pManager->put_ProtocolVersion( asSNMP_VERSION_V2C );

    // Clear the data
    m_pSnmpObject->Clear ();

    // Set the data to be send with the trap
    m_pSnmpObject->put_Value ( _bstr_t ( ( LPCTSTR ) m_strSendValue ) );
    m_pSnmpObject->put_OID   ( _bstr_t ( ( LPCTSTR ) m_strSendOID ) );
    m_pSnmpObject->put_Type  ( String2Type ( ( LPCTSTR ) m_strSendDataType ) );

    m_pSnmpTrap->Clear ();

    // Set the trap properties and add the data
    m_pSnmpTrap->put_Host       ( _bstr_t ( ( LPCTSTR ) m_strSendAgent ) );
    m_pSnmpTrap->put_Port       ( m_lSendPort );
    m_pSnmpTrap->put_Community  ( _bstr_t ( ( LPCTSTR ) m_strSendCommunity ) );

    m_pSnmpTrap->AddObject ( &_variant_t ( ( IDispatch* ) m_pSnmpObject ) );
	
    if( m_strSendTranslationMode == "SNMP v1" )
    {
        m_pSnmpTrap->put_GenericTrap  ( m_comboGeneric.GetCurSel () );
        m_pSnmpTrap->put_SpecificTrap ( m_nSpecificTrap );
        m_pSnmpTrap->put_Enterprise   ( _bstr_t ( ( LPCTSTR ) m_strEnterprise ) );
    }

    // Send the trap
    m_pManager->Send( &_variant_t ( ( IDispatch* ) m_pSnmpTrap ) );
		
    m_pSnmpTrap->Clear ();
    m_pSnmpObject->Clear ();

    UpdateData( FALSE );
}

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