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Diffstat (limited to '')
| -rw-r--r-- | servers/slapd/txn.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/servers/slapd/txn.c b/servers/slapd/txn.c new file mode 100644 index 0000000..edb3556 --- /dev/null +++ b/servers/slapd/txn.c @@ -0,0 +1,217 @@ +/* txn.c - LDAP Transactions */ +/* $OpenLDAP$ */ +/* This work is part of OpenLDAP Software <http://www.openldap.org/>. + * + * Copyright 1998-2018 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 */ |