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-rw-r--r--servers/slapd/txn.c363
1 files changed, 363 insertions, 0 deletions
diff --git a/servers/slapd/txn.c b/servers/slapd/txn.c
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index 0000000..d81de95
--- /dev/null
+++ b/servers/slapd/txn.c
@@ -0,0 +1,363 @@
+/* txn.c - LDAP Transactions */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1998-2022 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>
+
+const struct berval slap_EXOP_TXN_START = BER_BVC(LDAP_EXOP_TXN_START);
+const struct berval slap_EXOP_TXN_END = BER_BVC(LDAP_EXOP_TXN_END);
+
+int txn_start_extop(
+ Operation *op, SlapReply *rs )
+{
+ int rc;
+ struct berval *bv;
+
+ Debug( LDAP_DEBUG_STATS, "%s TXN START\n",
+ op->o_log_prefix );
+
+ 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_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;
+}
+
+typedef struct txn_rctrls {
+ struct txn_rctrls *tr_next;
+ ber_int_t tr_msgid;
+ LDAPControl ** tr_ctrls;
+} txn_rctrls;
+
+static int txn_result( Operation *op, SlapReply *rs )
+{
+ if ( rs->sr_ctrls ) {
+ txn_rctrls **t0, *tr;
+ for ( t0 = (txn_rctrls **) &op->o_callback->sc_private; *t0;
+ t0 = &(*t0)->tr_next )
+ ;
+ tr = op->o_tmpalloc( sizeof( txn_rctrls ), op->o_tmpmemctx );
+ tr->tr_next = NULL;
+ *t0 = tr;
+ tr->tr_msgid = op->o_msgid;
+ tr->tr_ctrls = ldap_controls_dup( rs->sr_ctrls );
+ }
+ return rs->sr_err;
+}
+
+static int txn_put_ctrls( Operation *op, BerElement *ber, txn_rctrls *tr )
+{
+ txn_rctrls *next;
+ int i;
+ ber_printf( ber, "{" );
+ for ( ; tr; tr = next ) {
+ next = tr->tr_next;
+ ber_printf( ber, "{it{", tr->tr_msgid, LDAP_TAG_CONTROLS );
+ for ( i = 0; tr->tr_ctrls[i]; i++ )
+ ldap_pvt_put_control( tr->tr_ctrls[i], ber );
+ ber_printf( ber, "}}" );
+ ldap_controls_free( tr->tr_ctrls );
+ op->o_tmpfree( tr, op->o_tmpmemctx );
+ }
+ ber_printf( ber, "}" );
+ return 0;
+}
+
+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;
+ Operation *o, *p;
+ Connection *c = op->o_conn;
+
+ Debug( LDAP_DEBUG_STATS, "%s TXN END\n",
+ op->o_log_prefix );
+
+ 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 = c->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_TXN_ID_INVALID;
+ }
+
+ /* acquire connection lock */
+ ldap_pvt_thread_mutex_lock( &c->c_mutex );
+
+ if( c->c_txn != CONN_TXN_SPECIFY ) {
+ rs->sr_text = "invalid transaction identifier";
+ rc = LDAP_TXN_ID_INVALID;
+ goto done;
+ }
+ c->c_txn = CONN_TXN_SETTLE;
+
+ if( commit ) {
+ slap_callback cb = {0};
+ OpExtra *txn = NULL;
+ if ( op->o_abandon ) {
+ goto drain;
+ }
+
+ if( LDAP_STAILQ_EMPTY(&c->c_txn_ops) ) {
+ /* no updates to commit */
+ rs->sr_text = "no updates to commit";
+ rc = LDAP_OPERATIONS_ERROR;
+ goto settled;
+ }
+
+ cb.sc_response = txn_result;
+ LDAP_STAILQ_FOREACH( o, &c->c_txn_ops, o_next ) {
+ o->o_bd = c->c_txn_backend;
+ p = o;
+ if ( !txn ) {
+ rc = o->o_bd->bd_info->bi_op_txn(o, SLAP_TXN_BEGIN, &txn );
+ if ( rc ) {
+ rs->sr_text = "couldn't start DB transaction";
+ rc = LDAP_OTHER;
+ goto drain;
+ }
+ } else {
+ LDAP_SLIST_INSERT_HEAD( &o->o_extra, txn, oe_next );
+ }
+ cb.sc_next = o->o_callback;
+ o->o_callback = &cb;
+ {
+ SlapReply rs = {REP_RESULT};
+ int opidx = slap_req2op( o->o_tag );
+ assert( opidx != SLAP_OP_LAST );
+ o->o_threadctx = op->o_threadctx;
+ o->o_tid = op->o_tid;
+ ldap_pvt_thread_mutex_unlock( &c->c_mutex );
+ rc = (&o->o_bd->bd_info->bi_op_bind)[opidx]( o, &rs );
+ ldap_pvt_thread_mutex_lock( &c->c_mutex );
+ }
+ if ( rc ) {
+ struct berval *bv = NULL;
+ BerElementBuffer berbuf;
+ BerElement *ber = (BerElement *)&berbuf;
+
+ ber_init_w_nullc( ber, LBER_USE_DER );
+ ber_printf( ber, "{i", o->o_msgid );
+ if ( cb.sc_private )
+ txn_put_ctrls( op, ber, cb.sc_private );
+ ber_printf( ber, "}" );
+ ber_flatten( ber, &bv );
+ ber_free_buf( ber );
+ rs->sr_rspdata = bv;
+ o->o_bd->bd_info->bi_op_txn(o, SLAP_TXN_ABORT, &txn );
+ goto drain;
+ }
+ }
+ if ( cb.sc_private ) {
+ struct berval *bv = NULL;
+ BerElementBuffer berbuf;
+ BerElement *ber = (BerElement *)&berbuf;
+
+ ber_init_w_nullc( ber, LBER_USE_DER );
+ ber_printf( ber, "{" );
+ txn_put_ctrls( op, ber, cb.sc_private );
+ ber_printf( ber, "}" );
+ ber_flatten( ber, &bv );
+ ber_free_buf( ber );
+ rs->sr_rspdata = bv;
+ }
+ o = p;
+ rc = o->o_bd->bd_info->bi_op_txn(o, SLAP_TXN_COMMIT, &txn );
+ if ( rc ) {
+ rs->sr_text = "transaction commit failed";
+ rc = LDAP_OTHER;
+ }
+ } else {
+ rs->sr_text = "transaction aborted";
+ rc = LDAP_SUCCESS;
+ }
+
+drain:
+ /* drain txn ops list */
+ while (( o = LDAP_STAILQ_FIRST( &c->c_txn_ops )) != NULL ) {
+ LDAP_STAILQ_REMOVE_HEAD( &c->c_txn_ops, o_next );
+ LDAP_STAILQ_NEXT( o, o_next ) = NULL;
+ slap_op_free( o, NULL );
+ }
+
+settled:
+ assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
+ assert( c->c_txn == CONN_TXN_SETTLE );
+ c->c_txn = CONN_TXN_INACTIVE;
+ c->c_txn_backend = NULL;
+
+done:
+ /* release connection lock */
+ ldap_pvt_thread_mutex_unlock( &c->c_mutex );
+
+ return rc;
+}
+
+int txn_preop( Operation *op, SlapReply *rs )
+{
+ /* 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 = "invalid transaction identifier";
+ rs->sr_err = LDAP_TXN_ID_INVALID;
+ goto txnReturn;
+ }
+
+ if( op->o_conn->c_txn_backend == NULL ) {
+ op->o_conn->c_txn_backend = op->o_bd;
+
+ } else if( op->o_conn->c_txn_backend != op->o_bd ) {
+ rs->sr_text = "transaction cannot span multiple database contexts";
+ rs->sr_err = LDAP_AFFECTS_MULTIPLE_DSAS;
+ goto txnReturn;
+ }
+
+ if ( !SLAP_TXNS( op->o_bd )) {
+ rs->sr_text = "backend doesn't support transactions";
+ rs->sr_err = LDAP_UNWILLING_TO_PERFORM;
+ goto txnReturn;
+ }
+
+ /* insert operation into transaction */
+ LDAP_STAILQ_REMOVE( &op->o_conn->c_ops, op, Operation, o_next );
+ LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_txn_ops, op, o_next );
+
+txnReturn:
+ /* release connection lock */
+ ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+
+ if ( op->o_tag != LDAP_REQ_EXTENDED )
+ send_ldap_result( op, rs );
+ if ( !rs->sr_err )
+ rs->sr_err = LDAP_TXN_SPECIFY_OKAY;
+ return rs->sr_err;
+}