Example Code for Establishing a Session Without Encryption

This code example shows how to establish an unencrypted LDAP connection to an Active Directory server using LDAP version 3. Be aware that the user password is not transmitted over the network in plaintext.

  • Initializes a session (LDAP structure).
  • Sets the LDAP version to three.
  • Sets a bind to the server using the user-login credentials and LDAP_AUTH_NEGOTIATE. Binding in this manner, assures that the user password is not transmitted over the network in plaintext, but the method of authentication used depends on what methods are available on both the client and server.
//  Add Wldap32.lib to your project.
//  Add Wldap32.dll to your project.

//  LDAPSESSION: Run the following code example by passing the server name as a
//  command line parameter. If no server name is passed, a serverless bind attempt is performed.
//  Example:
//    ldapsession.exe [server.fabrikam.com]

#include "stdafx.h"
#include "windows.h"
#include "winldap.h"
#include "stdio.h"
const size_t newsize = 100;

//  Entry point for application
int main(int argc, char* argv[])
    PWCHAR hostName = NULL;
    LDAP* pLdapConnection = NULL;
    ULONG version = LDAP_VERSION3;
    ULONG getOptSuccess = 0;
    ULONG connectSuccess = 0;
    INT returnCode = 0;

    //  Verify that the user passed a hostname.
    if (argc > 1)
        //  Convert argv[] to a wchar_t*
        size_t origsize = strlen(argv[1]) + 1;
        size_t convertedChars = 0;
        wchar_t wcstring[newsize];
        mbstowcs_s(&convertedChars, wcstring, origsize, argv[1], _TRUNCATE);
        wcscat_s(wcstring, L" (wchar_t *)");
        hostName = wcstring;
        hostName = NULL;

    //  Initialize a session. LDAP_PORT is the default port, 389.
    pLdapConnection = ldap_init(hostName, LDAP_PORT);

    if (pLdapConnection == NULL)
        //  Set the HRESULT based on the Windows error code.
        char hr = HRESULT_FROM_WIN32(GetLastError());
        printf( "ldap_init failed with 0x%x.\n",hr);
        goto error_exit;
        printf("ldap_init succeeded \n");

    //  Set the version to 3.0 (default is 2.0).
    returnCode = ldap_set_option(pLdapConnection,
    if(returnCode == LDAP_SUCCESS)
        printf("ldap_set_option succeeded - version set to 3\n");
        printf("SetOption Error:%0X\n", returnCode);
        goto error_exit;

    // Connect to the server.
    connectSuccess = ldap_connect(pLdapConnection, NULL);

    if(connectSuccess == LDAP_SUCCESS)
        printf("ldap_connect succeeded \n");
        printf("ldap_connect failed with 0x%x.\n",connectSuccess);
        goto error_exit;

    //  Bind with current credentials (login credentials). Be
    //  aware that the password itself is never sent over the 
    //  network, and encryption is not used.
    printf("Binding ...\n");

    returnCode = ldap_bind_s(pLdapConnection, NULL, NULL,
    if (returnCode == LDAP_SUCCESS)
        printf("The bind was successful");
        goto error_exit;

    //  Normal cleanup and exit.
    return 0;

    //  On error cleanup and exit.
        return -1;