/* backend.c - routines for dealing with back-end databases */


#include "portable.h"

#include <stdio.h>

#include <ac/string.h>
#include <ac/socket.h>

#include <sys/stat.h>

#include "slap.h"


#define BACKEND_GRAB_SIZE	10

int		nbackends;
Backend		*backends;
static int	maxbackends;

Backend *
new_backend(
    char	*type
)
{
	Backend	*be;
	int	foundit;

	if ( nbackends == maxbackends ) {
		maxbackends += BACKEND_GRAB_SIZE;
		backends = (Backend *) ch_realloc( (char *) backends,
		    maxbackends * sizeof(Backend) );
		memset( &backends[nbackends], '\0', BACKEND_GRAB_SIZE *
		    sizeof(Backend) );
	}

	be = &backends[nbackends++];
	be->be_sizelimit = defsize;
	be->be_timelimit = deftime;
	foundit = 0;

#ifdef SLAPD_LDBM
	if ( strcasecmp( type, "ldbm" ) == 0 ) {
		be->be_bind = ldbm_back_bind;
		be->be_unbind = ldbm_back_unbind;
		be->be_search = ldbm_back_search;
		be->be_compare = ldbm_back_compare;
		be->be_modify = ldbm_back_modify;
		be->be_modrdn = ldbm_back_modrdn;
		be->be_add = ldbm_back_add;
		be->be_delete = ldbm_back_delete;
		be->be_abandon = ldbm_back_abandon;
		be->be_config = ldbm_back_config;
		be->be_init = ldbm_back_init;
		be->be_close = ldbm_back_close;
#ifdef SLAPD_ACLGROUPS
		be->be_group = ldbm_back_group;
#endif
		be->be_type = "ldbm";
		foundit = 1;
	}
#endif

#ifdef SLAPD_PASSWD
	if ( strcasecmp( type, "passwd" ) == 0 ) {
		be->be_bind = NULL;
		be->be_unbind = NULL;
		be->be_search = passwd_back_search;
		be->be_compare = NULL;
		be->be_modify = NULL;
		be->be_modrdn = NULL;
		be->be_add = NULL;
		be->be_delete = NULL;
		be->be_abandon = NULL;
		be->be_config = passwd_back_config;
		be->be_init = NULL;
		be->be_close = NULL;
#ifdef SLAPD_ACLGROUPS
		be->be_group = NULL;
#endif
		be->be_type = "passwd";
		foundit = 1;
	}
#endif

#ifdef SLAPD_SHELL
	if ( strcasecmp( type, "shell" ) == 0 ) {
		be->be_bind = shell_back_bind;
		be->be_unbind = shell_back_unbind;
		be->be_search = shell_back_search;
		be->be_compare = shell_back_compare;
		be->be_modify = shell_back_modify;
		be->be_modrdn = shell_back_modrdn;
		be->be_add = shell_back_add;
		be->be_delete = shell_back_delete;
		be->be_abandon = shell_back_abandon;
		be->be_config = shell_back_config;
		be->be_init = shell_back_init;
		be->be_close = NULL;
#ifdef SLAPD_ACLGROUPS
		be->be_group = NULL;
#endif
		be->be_type = "shell";
		foundit = 1;
	}
#endif

	if ( be->be_init != NULL ) {
		(*be->be_init)( be );
	}

	if ( foundit == 0 ) {
		fprintf( stderr, "Unrecognized database type (%s)\n", type );
		exit( 1 );
	}

	return( be );
}

Backend *
select_backend( char * dn )
{
	int	i, j, len, dnlen;

	dnlen = strlen( dn );
	for ( i = 0; i < nbackends; i++ ) {
		for ( j = 0; backends[i].be_suffix != NULL &&
		    backends[i].be_suffix[j] != NULL; j++ )
		{
			len = strlen( backends[i].be_suffix[j] );

			if ( len > dnlen ) {
				continue;
			}

			if ( strcasecmp( backends[i].be_suffix[j],
			    dn + (dnlen - len) ) == 0 ) {
				return( &backends[i] );
			}
		}
	}

        /* if no proper suffix could be found then check for aliases */
        for ( i = 0; i < nbackends; i++ ) {
                for ( j = 0; 
		      backends[i].be_suffixAlias != NULL && 
                      backends[i].be_suffixAlias[j] != NULL; 
		      j += 2 )
                {
                        len = strlen( backends[i].be_suffixAlias[j] );

                        if ( len > dnlen ) {
                                continue;
                        }

                        if ( strcasecmp( backends[i].be_suffixAlias[j],
                            dn + (dnlen - len) ) == 0 ) {
                                return( &backends[i] );
                        }
                }
        }

#ifdef LDAP_ALLOW_NULL_SEARCH_BASE
	/* Add greg@greg.rim.or.jp
	 * It's quick hack for cheap client
	 * Some browser offer a NULL base at ldap_search
	 *
	 * Should only be used as a last resort. -Kdz
	 */
	if(dnlen == 0) {
		Debug( LDAP_DEBUG_TRACE,
			"select_backend: use default backend\n", 0, 0, 0 );
		return( &backends[0] );
	}
#endif /* LDAP_ALLOW_NULL_SEARCH_BASE */

	return( NULL );
}

int
be_issuffix(
    Backend	*be,
    char	*suffix
)
{
	int	i;

	for ( i = 0; be->be_suffix != NULL && be->be_suffix[i] != NULL; i++ ) {
		if ( strcasecmp( be->be_suffix[i], suffix ) == 0 ) {
			return( 1 );
		}
	}

	return( 0 );
}

int
be_isroot( Backend *be, char *dn )
{
	if ( dn == NULL ) {
		return( 0 );
	}

	return( be->be_rootdn ? strcasecmp( be->be_rootdn, dn ) == 0
	    : 0 );
}

int
be_isroot_pw( Backend *be, char *dn, struct berval *cred )
{
	int result;

	if ( ! be_isroot( be, dn ) ) {
		return( 0 );
	}

#ifdef SLAPD_CRYPT
	pthread_mutex_lock( &crypt_mutex );
#endif

	result = lutil_passwd( cred->bv_val, be->be_rootpw );

#ifdef SLAPD_CRYPT
	pthread_mutex_unlock( &crypt_mutex );
#endif

	return result == 0;
}

void
be_close( void )
{
	int	i;

	for ( i = 0; i < nbackends; i++ ) {
		if ( backends[i].be_close != NULL ) {
			(*backends[i].be_close)( &backends[i] );
		}
	}
}


void
be_unbind(
	Connection   *conn,
	Operation    *op
)
{
	int	i;

	for ( i = 0; i < nbackends; i++ ) {
		if ( backends[i].be_unbind != NULL ) {
			(*backends[i].be_unbind)( &backends[i], conn, op );
		}
	}
}

#ifdef SLAPD_ACLGROUPS
int 
be_group(
	Backend	*be,
	Entry	*e,
	char	*bdn,
	char	*edn,
	char	*objectclassValue,
	char	*groupattrName
)
{
        if (be->be_group)
                return(be->be_group(be, e, bdn, edn,
					objectclassValue, groupattrName));
        else
                return(1);
}
#endif
