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openldap/servers/slapd/back-null/null.c
Kurt Zeilenga 966cef8c9a Happy New Year
2011-01-05 00:42:37 +00:00

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/* null.c - the null backend */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2002-2011 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
/* ACKNOWLEDGEMENTS:
* This work was originally developed by Hallvard Furuseth for inclusion
* in OpenLDAP Software.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/string.h>
#include "slap.h"
#include "config.h"
struct null_info {
int ni_bind_allowed;
ID ni_nextid;
};
static ConfigDriver null_cf_gen;
static ConfigTable nullcfg[] = {
{ "bind", "true|FALSE", 1, 2, 0, ARG_ON_OFF|ARG_MAGIC,
null_cf_gen,
"( OLcfgDbAt:8.1 NAME 'olcDbBindAllowed' "
"DESC 'Allow binds to this database' "
"SYNTAX OMsBoolean SINGLE-VALUE )", NULL, NULL },
{ NULL, NULL, 0, 0, 0, ARG_IGNORED,
NULL, NULL, NULL, NULL }
};
static ConfigOCs nullocs[] = {
{ "( OLcfgDbOc:8.1 "
"NAME 'olcNullConfig' "
"DESC 'Null backend ocnfiguration' "
"SUP olcDatabaseConfig "
"MAY ( olcDbBindAllowed ) )",
Cft_Database, nullcfg },
{ NULL, 0, NULL }
};
/* LDAP operations */
static int
null_back_bind( Operation *op, SlapReply *rs )
{
struct null_info *ni = (struct null_info *) op->o_bd->be_private;
if ( ni->ni_bind_allowed || be_isroot_pw( op ) ) {
/* front end will send result on success (0) */
return LDAP_SUCCESS;
}
rs->sr_err = LDAP_INVALID_CREDENTIALS;
send_ldap_result( op, rs );
return rs->sr_err;
}
static int
null_back_respond( Operation *op, SlapReply *rs, int rc )
{
LDAPControl ctrl[SLAP_MAX_RESPONSE_CONTROLS], *ctrls[SLAP_MAX_RESPONSE_CONTROLS];
int c = 0;
BerElementBuffer ps_berbuf;
BerElement *ps_ber = NULL;
LDAPControl **preread_ctrl = NULL,
**postread_ctrl = NULL;
rs->sr_err = LDAP_OTHER;
/* this comes first, as in case of assertion failure
* any further processing must stop */
if ( get_assert( op ) ) {
rs->sr_err = LDAP_ASSERTION_FAILED;
goto respond;
}
if ( op->o_preread ) {
Entry e = { 0 };
switch ( op->o_tag ) {
case LDAP_REQ_MODIFY:
case LDAP_REQ_RENAME:
case LDAP_REQ_DELETE:
e.e_name = op->o_req_dn;
e.e_nname = op->o_req_ndn;
preread_ctrl = &ctrls[c];
*preread_ctrl = NULL;
if ( slap_read_controls( op, rs, &e,
&slap_pre_read_bv, preread_ctrl ) )
{
preread_ctrl = NULL;
Debug( LDAP_DEBUG_TRACE,
"<=- null_back_respond: pre-read "
"failed!\n", 0, 0, 0 );
if ( op->o_preread & SLAP_CONTROL_CRITICAL ) {
/* FIXME: is it correct to abort
* operation if control fails? */
goto respond;
}
} else {
c++;
}
break;
}
}
if ( op->o_postread ) {
Entry e = { 0 };
switch ( op->o_tag ) {
case LDAP_REQ_ADD:
case LDAP_REQ_MODIFY:
case LDAP_REQ_RENAME:
if ( op->o_tag == LDAP_REQ_ADD ) {
e.e_name = op->ora_e->e_name;
e.e_nname = op->ora_e->e_nname;
} else {
e.e_name = op->o_req_dn;
e.e_nname = op->o_req_ndn;
}
postread_ctrl = &ctrls[c];
*postread_ctrl = NULL;
if ( slap_read_controls( op, rs, &e,
&slap_post_read_bv, postread_ctrl ) )
{
postread_ctrl = NULL;
Debug( LDAP_DEBUG_TRACE,
"<=- null_back_respond: post-read "
"failed!\n", 0, 0, 0 );
if ( op->o_postread & SLAP_CONTROL_CRITICAL ) {
/* FIXME: is it correct to abort
* operation if control fails? */
goto respond;
}
} else {
c++;
}
break;
}
}
if ( op->o_noop ) {
switch ( op->o_tag ) {
case LDAP_REQ_ADD:
case LDAP_REQ_MODIFY:
case LDAP_REQ_RENAME:
case LDAP_REQ_DELETE:
case LDAP_REQ_EXTENDED:
rc = LDAP_X_NO_OPERATION;
break;
}
}
if ( get_pagedresults( op ) > SLAP_CONTROL_IGNORED ) {
struct berval cookie = BER_BVC( "" );
/* should not be here... */
assert( op->o_tag == LDAP_REQ_SEARCH );
ctrl[c].ldctl_oid = LDAP_CONTROL_PAGEDRESULTS;
ctrl[c].ldctl_iscritical = 0;
ps_ber = (BerElement *)&ps_berbuf;
ber_init2( ps_ber, NULL, LBER_USE_DER );
/* return size of 0 -- no estimate */
ber_printf( ps_ber, "{iO}", 0, &cookie );
if ( ber_flatten2( ps_ber, &ctrl[c].ldctl_value, 0 ) == -1 ) {
goto done;
}
ctrls[c] = &ctrl[c];
c++;
}
/* terminate controls array */
ctrls[c] = NULL;
rs->sr_ctrls = ctrls;
rs->sr_err = rc;
respond:;
send_ldap_result( op, rs );
rs->sr_ctrls = NULL;
done:;
if ( ps_ber != NULL ) {
(void) ber_free_buf( ps_ber );
}
if( preread_ctrl != NULL && (*preread_ctrl) != NULL ) {
slap_sl_free( (*preread_ctrl)->ldctl_value.bv_val, op->o_tmpmemctx );
slap_sl_free( *preread_ctrl, op->o_tmpmemctx );
}
if( postread_ctrl != NULL && (*postread_ctrl) != NULL ) {
slap_sl_free( (*postread_ctrl)->ldctl_value.bv_val, op->o_tmpmemctx );
slap_sl_free( *postread_ctrl, op->o_tmpmemctx );
}
return rs->sr_err;
}
/* add, delete, modify, modrdn, search */
static int
null_back_success( Operation *op, SlapReply *rs )
{
return null_back_respond( op, rs, LDAP_SUCCESS );
}
/* compare */
static int
null_back_false( Operation *op, SlapReply *rs )
{
return null_back_respond( op, rs, LDAP_COMPARE_FALSE );
}
/* for overlays */
static int
null_back_entry_get(
Operation *op,
struct berval *ndn,
ObjectClass *oc,
AttributeDescription *at,
int rw,
Entry **ent )
{
/* don't admit the object isn't there */
return oc || at ? LDAP_NO_SUCH_ATTRIBUTE : LDAP_BUSY;
}
/* Slap tools */
static int
null_tool_entry_open( BackendDB *be, int mode )
{
return 0;
}
static int
null_tool_entry_close( BackendDB *be )
{
assert( be != NULL );
return 0;
}
static ID
null_tool_entry_first_x( BackendDB *be, struct berval *base, int scope, Filter *f )
{
return NOID;
}
static ID
null_tool_entry_next( BackendDB *be )
{
return NOID;
}
static Entry *
null_tool_entry_get( BackendDB *be, ID id )
{
assert( slapMode & SLAP_TOOL_MODE );
return NULL;
}
static ID
null_tool_entry_put( BackendDB *be, Entry *e, struct berval *text )
{
assert( slapMode & SLAP_TOOL_MODE );
assert( text != NULL );
assert( text->bv_val != NULL );
assert( text->bv_val[0] == '\0' ); /* overconservative? */
e->e_id = ((struct null_info *) be->be_private)->ni_nextid++;
return e->e_id;
}
/* Setup */
static int
null_cf_gen( ConfigArgs *c )
{
struct null_info *ni = (struct null_info *) c->be->be_private;
if ( c->op == SLAP_CONFIG_EMIT ) {
c->value_int = ni->ni_bind_allowed;
return LDAP_SUCCESS;
} else if ( c->op == LDAP_MOD_DELETE ) {
ni->ni_bind_allowed = 0;
return LDAP_SUCCESS;
}
ni->ni_bind_allowed = c->value_int;
return LDAP_SUCCESS;
}
static int
null_back_db_init( BackendDB *be, ConfigReply *cr )
{
struct null_info *ni = ch_calloc( 1, sizeof(struct null_info) );
ni->ni_bind_allowed = 0;
ni->ni_nextid = 1;
be->be_private = ni;
be->be_cf_ocs = be->bd_info->bi_cf_ocs;
return 0;
}
static int
null_back_db_destroy( Backend *be, ConfigReply *cr )
{
free( be->be_private );
return 0;
}
int
null_back_initialize( BackendInfo *bi )
{
static char *controls[] = {
LDAP_CONTROL_ASSERT,
LDAP_CONTROL_MANAGEDSAIT,
LDAP_CONTROL_NOOP,
LDAP_CONTROL_PAGEDRESULTS,
LDAP_CONTROL_SUBENTRIES,
LDAP_CONTROL_PRE_READ,
LDAP_CONTROL_POST_READ,
LDAP_CONTROL_X_PERMISSIVE_MODIFY,
NULL
};
Debug( LDAP_DEBUG_TRACE,
"null_back_initialize: initialize null backend\n", 0, 0, 0 );
bi->bi_flags |=
SLAP_BFLAG_INCREMENT |
SLAP_BFLAG_SUBENTRIES |
SLAP_BFLAG_ALIASES |
SLAP_BFLAG_REFERRALS;
bi->bi_controls = controls;
bi->bi_open = 0;
bi->bi_close = 0;
bi->bi_config = 0;
bi->bi_destroy = 0;
bi->bi_db_init = null_back_db_init;
bi->bi_db_config = config_generic_wrapper;
bi->bi_db_open = 0;
bi->bi_db_close = 0;
bi->bi_db_destroy = null_back_db_destroy;
bi->bi_op_bind = null_back_bind;
bi->bi_op_unbind = 0;
bi->bi_op_search = null_back_success;
bi->bi_op_compare = null_back_false;
bi->bi_op_modify = null_back_success;
bi->bi_op_modrdn = null_back_success;
bi->bi_op_add = null_back_success;
bi->bi_op_delete = null_back_success;
bi->bi_op_abandon = 0;
bi->bi_extended = 0;
bi->bi_chk_referrals = 0;
bi->bi_connection_init = 0;
bi->bi_connection_destroy = 0;
bi->bi_entry_get_rw = null_back_entry_get;
bi->bi_tool_entry_open = null_tool_entry_open;
bi->bi_tool_entry_close = null_tool_entry_close;
bi->bi_tool_entry_first = backend_tool_entry_first;
bi->bi_tool_entry_first_x = null_tool_entry_first_x;
bi->bi_tool_entry_next = null_tool_entry_next;
bi->bi_tool_entry_get = null_tool_entry_get;
bi->bi_tool_entry_put = null_tool_entry_put;
bi->bi_cf_ocs = nullocs;
return config_register_schema( nullcfg, nullocs );
}
#if SLAPD_NULL == SLAPD_MOD_DYNAMIC
/* conditionally define the init_module() function */
SLAP_BACKEND_INIT_MODULE( null )
#endif /* SLAPD_NULL == SLAPD_MOD_DYNAMIC */
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