CLDAP request - Netlogon attribute

[Srinivas Cheruku <srinivas.cheruku@gmail.com>]

Hi,

I am having openldap-2.3.11 compiled with -DLDAP_CONNECTIONLESS to enable CLDAP/LDAP-UDP.
I am using openldap apis to connect to MS AD and sending a CLDAP request to DC 
to get the Netlogon attribute, but i am getting error as 
"io.c:81: ber_write: Assertion `buf != ((void *)0)' failed."

I didn't find any sampe code to send a LDAP UDP request using openldap apis. And i don't know 
the openldap api to use for sending LDAP UDP request. But, i managed to write some code.

Can anyone send me a sample LDAP UDP request/response program?
Can anyone please let me know where my code is wrong?

Thanks in Advance,
Srini

Below is my code...

CODE STARTS ****
#include <stdio.h>
#include <ldap.h>
#include <lber.h>

#define LDAP_HOSTNAME	"xxxhost.domain.local"
#define LDAP_PORT	389
#define SAMPLE_USER	"sample_user"

int find_netlogon(
   LDAP *ld,
   LDAPMessage **res,
   char *domain,
   char *host,
   char *attr
   )
{
   char *Attr[] = {
      attr,
     NULL
   };
   char search_exp[1024];

   sprintf (search_exp, "(&(DnsDomain=%s)(Host=%s)(Ntver=\006))", domain, host);
   return ldap_search_s (ld, NULL, LDAP_SCOPE_BASE,
                       search_exp, Attr, 0, res);

}


int main(int argc, char *argv[])
{
   LDAPURLDesc url;
   char *ldapuri = NULL;
   LDAP *ld = NULL;
   int rc;
   int ldap_debug = LDAP_DEBUG_TRACE
   LDAPMessage *res;

   memset( &url, 0, sizeof(url));
   url.lud_scheme = "cldap";
   url.lud_host = LDAP_HOSTNAME;
   url.lud_port = LDAP_PORT;
   url.lud_scope = LDAP_SCOPE_DEFAULT;

   (void) ldap_set_option(NULL, LDAP_OPT_DEBUG_LEVEL, &ldap_debug);

   ldapuri = ldap_url_desc2str( &url );        

   rc = ldap_initialize( &ld, ldapuri );

   if( rc != LDAP_SUCCESS ) {       
           fprintf( stderr, "ldap_initialize( %s ) failed with error (%d): %s\n",
               ldapuri != NULL ? ldapuri : "<DEFAULT>", rc, ldap_err2string(rc) );        
   }else
       printf("LDAP initialize successful\n");

   rc = LDAP_VERSION3;
   (void)ldap_set_option(ld, LDAP_OPT_PROTOCOL_VERSION, &rc);
   (void)ldap_set_option(ld, LDAP_OPT_REFERRALS , 0); 

   printf("calling find_netlogon...\n");
   rc = find_netlogon(ld, &res, "domain.local", "xxxhost", "Netlogon");
   if (rc != LDAP_SUCCESS) {         
       printf("Error occured while find_netlogon\n");
       goto clean_exit;
   } else if (rc == LDAP_SUCCESS && ldap_count_entries(ld, res) == 0)
   {
	printf("No records found\n");
   }else
	printf("No of records found: %d\n", ldap_count_entries(ld, res));



clean_exit:
   if(ld) ldap_unbind(ld);
   
}
CODE ENDS ****