test.c 파일 내용입니다.

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#include <stdio.h>
#include <stdlib.h>
#include <ldap.h>
#include <string.h>
#include <time.h>
#include <sys/time.h>

#define SEARCHBASE "dc=mmu,dc=eci,dc=net"

void check_result_and_print(LDAP *ld, LDAPMessage *res);

main()
{
 LDAP *ld;
 LDAPMessage *res;
 int numfound;
 char *User=NULL;
 char *Passwd= NULL;
 char line[BUFSIZ],search[]="cn";
 
 printf("\n Type in a name to searhc for on LDAP server saturn :\n");
 fgets(line, 20 , stdin);
 strcat(search,line);
 search[strlen(search)-1]='\0';
 
 if((ld=ldap_init("localhost",389)) == NULL){
  fprintf(stderr, "1");
  exit(1);
 }

 if (ldap_simple_bind_s(ld,NULL ,NULL ) != LDAP_SUCCESS){
  ldap_perror(ld,"ldap_bind");
  fprintf(stderr, "2");
  exit(2);
 }

 if(ldap_search_s(ld,SEARCHBASE,LDAP_SCOPE_SUBTREE,search,NULL,0,&res)==-1){
  ldap_perror(ld,"Ldap_search");
  fprintf(stderr, "3");
  exit(1);
 }
 
 if((numfound=ldap_count_entries(ld,res))==-1){
  ldap_perror(ld,"ldap_count_entries");
  exit(1);
 }
 ldap_msgfree(res);
 ldap_unbind(ld);
 printf("Found %d entries of name %s \n\n",numfound,line);
 exit(0);
} 

int version = LDAP_VERSION3;
(void)ldap_set_option(ld,LDAP_OPT_PROTOCOL_VERSION,&version );

를 ldap_simple_bind_s 앞에 써주시면 됩니다.