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/* txn.c - LDAP Transactions */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 1998-2021 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>.
*/
#include "portable.h"
#include <stdio.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/unistd.h>
#include "slap.h"
#include <lber_pvt.h>
#include <lutil.h>
#ifdef LDAP_X_TXN
const struct berval slap_EXOP_TXN_START = BER_BVC(LDAP_EXOP_X_TXN_START);
const struct berval slap_EXOP_TXN_END = BER_BVC(LDAP_EXOP_X_TXN_END);
int txn_start_extop(
Operation *op, SlapReply *rs )
{
int rc;
struct berval *bv;
Statslog( LDAP_DEBUG_STATS, "%s TXN START\n",
op->o_log_prefix, 0, 0, 0, 0 );
if( op->ore_reqdata != NULL ) {
rs->sr_text = "no request data expected";
return LDAP_PROTOCOL_ERROR;
}
op->o_bd = op->o_conn->c_authz_backend;
if( backend_check_restrictions( op, rs,
(struct berval *)&slap_EXOP_TXN_START ) != LDAP_SUCCESS )
{
return rs->sr_err;
}
/* acquire connection lock */
ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
if( op->o_conn->c_txn != CONN_TXN_INACTIVE ) {
rs->sr_text = "Too many transactions";
rc = LDAP_BUSY;
goto done;
}
assert( op->o_conn->c_txn_backend == NULL );
op->o_conn->c_txn = CONN_TXN_SPECIFY;
bv = (struct berval *) ch_malloc( sizeof (struct berval) );
bv->bv_len = 0;
bv->bv_val = NULL;
rs->sr_rspdata = bv;
rc = LDAP_SUCCESS;
done:
/* release connection lock */
ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
return rc;
}
int txn_spec_ctrl(
Operation *op, SlapReply *rs, LDAPControl *ctrl )
{
if ( !ctrl->ldctl_iscritical ) {
rs->sr_text = "txnSpec control must be marked critical";
return LDAP_PROTOCOL_ERROR;
}
if( op->o_txnSpec ) {
rs->sr_text = "txnSpec control provided multiple times";
return LDAP_PROTOCOL_ERROR;
}
if ( ctrl->ldctl_value.bv_val == NULL ) {
rs->sr_text = "no transaction identifier provided";
return LDAP_PROTOCOL_ERROR;
}
if ( ctrl->ldctl_value.bv_len != 0 ) {
rs->sr_text = "invalid transaction identifier";
return LDAP_X_TXN_ID_INVALID;
}
if ( op->o_preread ) { /* temporary limitation */
rs->sr_text = "cannot perform pre-read in transaction";
return LDAP_UNWILLING_TO_PERFORM;
}
if ( op->o_postread ) { /* temporary limitation */
rs->sr_text = "cannot perform post-read in transaction";
return LDAP_UNWILLING_TO_PERFORM;
}
op->o_txnSpec = SLAP_CONTROL_CRITICAL;
return LDAP_SUCCESS;
}
int txn_end_extop(
Operation *op, SlapReply *rs )
{
int rc;
BerElementBuffer berbuf;
BerElement *ber = (BerElement *)&berbuf;
ber_tag_t tag;
ber_len_t len;
ber_int_t commit=1;
struct berval txnid;
Statslog( LDAP_DEBUG_STATS, "%s TXN END\n",
op->o_log_prefix, 0, 0, 0, 0 );
if( op->ore_reqdata == NULL ) {
rs->sr_text = "request data expected";
return LDAP_PROTOCOL_ERROR;
}
if( op->ore_reqdata->bv_len == 0 ) {
rs->sr_text = "empty request data";
return LDAP_PROTOCOL_ERROR;
}
op->o_bd = op->o_conn->c_authz_backend;
if( backend_check_restrictions( op, rs,
(struct berval *)&slap_EXOP_TXN_END ) != LDAP_SUCCESS )
{
return rs->sr_err;
}
ber_init2( ber, op->ore_reqdata, 0 );
tag = ber_scanf( ber, "{" /*}*/ );
if( tag == LBER_ERROR ) {
rs->sr_text = "request data decoding error";
return LDAP_PROTOCOL_ERROR;
}
tag = ber_peek_tag( ber, &len );
if( tag == LBER_BOOLEAN ) {
tag = ber_scanf( ber, "b", &commit );
if( tag == LBER_ERROR ) {
rs->sr_text = "request data decoding error";
return LDAP_PROTOCOL_ERROR;
}
}
tag = ber_scanf( ber, /*{*/ "m}", &txnid );
if( tag == LBER_ERROR ) {
rs->sr_text = "request data decoding error";
return LDAP_PROTOCOL_ERROR;
}
if( txnid.bv_len ) {
rs->sr_text = "invalid transaction identifier";
return LDAP_X_TXN_ID_INVALID;
}
/* acquire connection lock */
ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
if( op->o_conn->c_txn != CONN_TXN_SPECIFY ) {
rs->sr_text = "invalid transaction identifier";
rc = LDAP_X_TXN_ID_INVALID;
goto done;
}
op->o_conn->c_txn = CONN_TXN_SETTLE;
if( commit ) {
if ( op->o_abandon ) {
}
if( LDAP_STAILQ_EMPTY(&op->o_conn->c_txn_ops) ) {
/* no updates to commit */
rs->sr_text = "no updates to commit";
rc = LDAP_OPERATIONS_ERROR;
goto settled;
}
rs->sr_text = "not yet implemented";
rc = LDAP_UNWILLING_TO_PERFORM;
} else {
rs->sr_text = "transaction aborted";
rc = LDAP_SUCCESS;;
}
drain:
/* drain txn ops list */
settled:
assert( LDAP_STAILQ_EMPTY(&op->o_conn->c_txn_ops) );
assert( op->o_conn->c_txn == CONN_TXN_SETTLE );
op->o_conn->c_txn = CONN_TXN_INACTIVE;
op->o_conn->c_txn_backend = NULL;
done:
/* release connection lock */
ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
return rc;
}
#endif /* LDAP_X_TXN */
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