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diff --git a/servers/slapd/back-asyncmeta/compare.c b/servers/slapd/back-asyncmeta/compare.c
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+++ b/servers/slapd/back-asyncmeta/compare.c
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+/* compare.c - compare exop handler for back-asyncmeta */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2016-2022 The OpenLDAP Foundation.
+ * Portions Copyright 2016 Symas Corporation.
+ * 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 developed by Symas Corporation
++ * based on back-meta module for inclusion in OpenLDAP Software.
++ * This work was sponsored by Ericsson. */
+
+#include "portable.h"
+
+#include <stdio.h>
+
+#include <ac/string.h>
+#include <ac/socket.h>
+#include "slap.h"
+#include "../../../libraries/liblber/lber-int.h"
+#include "../../../libraries/libldap/ldap-int.h"
+#include "../back-ldap/back-ldap.h"
+#include "back-asyncmeta.h"
+
+meta_search_candidate_t
+asyncmeta_back_compare_start(Operation *op,
+ SlapReply *rs,
+ a_metaconn_t *mc,
+ bm_context_t *bc,
+ int candidate,
+ int do_lock)
+{
+ a_dncookie dc;
+ a_metainfo_t *mi = mc->mc_info;
+ a_metatarget_t *mt = mi->mi_targets[ candidate ];
+ struct berval c_attr = op->orc_ava->aa_desc->ad_cname;
+ struct berval mdn = BER_BVNULL;
+ struct berval mapped_value = op->orc_ava->aa_value;
+ int rc = 0;
+ LDAPControl **ctrls = NULL;
+ meta_search_candidate_t retcode = META_SEARCH_CANDIDATE;
+ BerElement *ber = NULL;
+ a_metasingleconn_t *msc = &mc->mc_conns[ candidate ];
+ SlapReply *candidates = bc->candidates;
+ ber_int_t msgid;
+
+ dc.op = op;
+ dc.target = mt;
+ dc.memctx = op->o_tmpmemctx;
+ dc.to_from = MASSAGE_REQ;
+
+ asyncmeta_dn_massage( &dc, &op->o_req_dn, &mdn );
+
+ if ( op->orc_ava->aa_desc->ad_type->sat_syntax == slap_schema.si_syn_distinguishedName )
+ asyncmeta_dn_massage( &dc, &op->orc_ava->aa_value, &mapped_value );
+
+ asyncmeta_set_msc_time(msc);
+ ctrls = op->o_ctrls;
+ if ( asyncmeta_controls_add( op, rs, mc, candidate, bc->is_root,&ctrls ) != LDAP_SUCCESS )
+ {
+ candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
+ retcode = META_SEARCH_ERR;
+ goto done;
+ }
+ /* someone might have reset the connection */
+ if (!( LDAP_BACK_CONN_ISBOUND( msc )
+ || LDAP_BACK_CONN_ISANON( msc )) || msc->msc_ld == NULL ) {
+ Debug( asyncmeta_debug, "msc %p not initialized at %s:%d\n", msc, __FILE__, __LINE__ );
+ goto error_unavailable;
+ }
+
+ ber = ldap_build_compare_req( msc->msc_ld, mdn.bv_val, c_attr.bv_val, &mapped_value,
+ ctrls, NULL, &msgid);
+
+ if (!ber) {
+ Debug( asyncmeta_debug, "%s asyncmeta_back_compare_start: Operation encoding failed with errno %d\n",
+ op->o_log_prefix, msc->msc_ld->ld_errno );
+ rs->sr_err = LDAP_OPERATIONS_ERROR;
+ rs->sr_text = "Failed to encode proxied request";
+ retcode = META_SEARCH_ERR;
+ goto done;
+ }
+
+ if (ber) {
+ struct timeval tv = {0, mt->mt_network_timeout*1000};
+ ber_socket_t s;
+ if (!( LDAP_BACK_CONN_ISBOUND( msc )
+ || LDAP_BACK_CONN_ISANON( msc )) || msc->msc_ld == NULL ) {
+ Debug( asyncmeta_debug, "msc %p not initialized at %s:%d\n", msc, __FILE__, __LINE__ );
+ goto error_unavailable;
+ }
+
+ ldap_get_option( msc->msc_ld, LDAP_OPT_DESC, &s );
+ if (s < 0) {
+ Debug( asyncmeta_debug, "msc %p not initialized at %s:%d\n", msc, __FILE__, __LINE__ );
+ goto error_unavailable;
+ }
+ rc = ldap_int_poll( msc->msc_ld, s, &tv, 1);
+ if (rc < 0) {
+ Debug( asyncmeta_debug, "msc %p not writable within network timeout %s:%d\n", msc, __FILE__, __LINE__ );
+ if ((msc->msc_result_time + META_BACK_RESULT_INTERVAL) < slap_get_time()) {
+ rc = LDAP_SERVER_DOWN;
+ } else {
+ goto error_unavailable;
+ }
+ } else {
+ candidates[ candidate ].sr_msgid = msgid;
+ rc = ldap_send_initial_request( msc->msc_ld, LDAP_REQ_COMPARE,
+ mdn.bv_val, ber, msgid );
+ if (rc == msgid)
+ rc = LDAP_SUCCESS;
+ else
+ rc = LDAP_SERVER_DOWN;
+ ber = NULL;
+ }
+
+ switch ( rc ) {
+ case LDAP_SUCCESS:
+ retcode = META_SEARCH_CANDIDATE;
+ asyncmeta_set_msc_time(msc);
+ goto done;
+
+ case LDAP_SERVER_DOWN:
+ /* do not lock if called from asyncmeta_handle_bind_result. Also do not reset the connection */
+ if (do_lock > 0) {
+ ldap_pvt_thread_mutex_lock( &mc->mc_om_mutex);
+ asyncmeta_reset_msc(NULL, mc, candidate, 0, __FUNCTION__);
+ ldap_pvt_thread_mutex_unlock( &mc->mc_om_mutex);
+ }
+ /* fall though*/
+ default:
+ Debug( asyncmeta_debug, "msc %p ldap_send_initial_request failed. %s:%d\n", msc, __FILE__, __LINE__ );
+ goto error_unavailable;
+ }
+ }
+
+error_unavailable:
+ if (ber)
+ ber_free(ber, 1);
+ switch (bc->nretries[candidate]) {
+ case -1: /* nretries = forever */
+ retcode = META_SEARCH_NEED_BIND;
+ break;
+ case 0: /* no retries left */
+ candidates[ candidate ].sr_msgid = META_MSGID_IGNORE;
+ rs->sr_err = LDAP_UNAVAILABLE;
+ rs->sr_text = "Unable to send compare request to target";
+ retcode = META_SEARCH_ERR;
+ break;
+ default: /* more retries left - try to rebind and go again */
+ retcode = META_SEARCH_NEED_BIND;
+ bc->nretries[candidate]--;
+ break;
+ }
+done:
+ (void)mi->mi_ldap_extra->controls_free( op, rs, &ctrls );
+
+ if ( op->orc_ava->aa_value.bv_val != mapped_value.bv_val ) {
+ op->o_tmpfree( mapped_value.bv_val, op->o_tmpmemctx );
+ }
+
+ if ( mdn.bv_val != op->o_req_dn.bv_val ) {
+ op->o_tmpfree( mdn.bv_val, op->o_tmpmemctx );
+ }
+
+ Debug( LDAP_DEBUG_TRACE, "%s <<< asyncmeta_back_compare_start[%p]=%d\n", op->o_log_prefix, msc, candidates[candidate].sr_msgid );
+ return retcode;
+}
+
+int
+asyncmeta_back_compare( Operation *op, SlapReply *rs )
+{
+ a_metainfo_t *mi = ( a_metainfo_t * )op->o_bd->be_private;
+ a_metatarget_t *mt;
+ a_metaconn_t *mc;
+ int rc, candidate = -1;
+ void *thrctx = op->o_threadctx;
+ bm_context_t *bc;
+ SlapReply *candidates;
+ time_t current_time = slap_get_time();
+ int max_pending_ops = (mi->mi_max_pending_ops == 0) ? META_BACK_CFG_MAX_PENDING_OPS : mi->mi_max_pending_ops;
+
+ Debug(LDAP_DEBUG_ARGS, "==> asyncmeta_back_compare: %s\n",
+ op->o_req_dn.bv_val );
+
+ if (current_time > op->o_time) {
+ Debug( asyncmeta_debug, "==> asyncmeta_back_compare[%s]: o_time:[%ld], current time: [%ld]\n",
+ op->o_log_prefix, op->o_time, current_time );
+ }
+ asyncmeta_new_bm_context(op, rs, &bc, mi->mi_ntargets, mi );
+ if (bc == NULL) {
+ rs->sr_err = LDAP_OTHER;
+ send_ldap_result(op, rs);
+ return rs->sr_err;
+ }
+
+ candidates = bc->candidates;
+ mc = asyncmeta_getconn( op, rs, candidates, &candidate, LDAP_BACK_DONTSEND, 0);
+ if ( !mc || rs->sr_err != LDAP_SUCCESS) {
+ send_ldap_result(op, rs);
+ return rs->sr_err;
+ }
+
+ mt = mi->mi_targets[ candidate ];
+ bc->timeout = mt->mt_timeout[ SLAP_OP_COMPARE ];
+ bc->retrying = LDAP_BACK_RETRYING;
+ bc->sendok = ( LDAP_BACK_SENDRESULT | bc->retrying );
+ bc->stoptime = op->o_time + bc->timeout;
+ bc->bc_active = 1;
+
+ if (mc->pending_ops >= max_pending_ops) {
+ rs->sr_err = LDAP_BUSY;
+ rs->sr_text = "Maximum pending ops limit exceeded";
+ send_ldap_result(op, rs);
+ return rs->sr_err;
+ }
+
+ ldap_pvt_thread_mutex_lock( &mc->mc_om_mutex);
+ rc = asyncmeta_add_message_queue(mc, bc);
+ mc->mc_conns[candidate].msc_active++;
+ ldap_pvt_thread_mutex_unlock( &mc->mc_om_mutex);
+
+ if (rc != LDAP_SUCCESS) {
+ rs->sr_err = LDAP_BUSY;
+ rs->sr_text = "Maximum pending ops limit exceeded";
+ send_ldap_result(op, rs);
+ ldap_pvt_thread_mutex_lock( &mc->mc_om_mutex);
+ mc->mc_conns[candidate].msc_active--;
+ ldap_pvt_thread_mutex_unlock( &mc->mc_om_mutex);
+ goto finish;
+ }
+
+retry:
+ if (bc->timeout && bc->stoptime < slap_get_time()) {
+ int timeout_err;
+ timeout_err = op->o_protocol >= LDAP_VERSION3 ?
+ LDAP_ADMINLIMIT_EXCEEDED : LDAP_OTHER;
+ rs->sr_err = timeout_err;
+ rs->sr_text = "Operation timed out before it was sent to target";
+ asyncmeta_error_cleanup(op, rs, bc, mc, candidate);
+ goto finish;
+ }
+
+ rc = asyncmeta_dobind_init_with_retry(op, rs, bc, mc, candidate);
+ switch (rc)
+ {
+ case META_SEARCH_CANDIDATE:
+ /* target is already bound, just send the request */
+ Debug( LDAP_DEBUG_TRACE, "%s asyncmeta_back_compare: "
+ "cnd=\"%d\"\n", op->o_log_prefix, candidate );
+
+ rc = asyncmeta_back_compare_start( op, rs, mc, bc, candidate, 1);
+ if (rc == META_SEARCH_ERR) {
+ asyncmeta_error_cleanup(op, rs, bc, mc, candidate);
+ goto finish;
+
+ } else if (rc == META_SEARCH_NEED_BIND) {
+ goto retry;
+ }
+ break;
+ case META_SEARCH_NOT_CANDIDATE:
+ Debug( LDAP_DEBUG_TRACE, "%s asyncmeta_back_compare: NOT_CANDIDATE "
+ "cnd=\"%d\"\n", op->o_log_prefix, candidate );
+ asyncmeta_error_cleanup(op, rs, bc, mc, candidate);
+ goto finish;
+
+ case META_SEARCH_NEED_BIND:
+ case META_SEARCH_BINDING:
+ Debug( LDAP_DEBUG_TRACE, "%s asyncmeta_back_compare: BINDING "
+ "cnd=\"%d\" %p\n", op->o_log_prefix, candidate , &mc->mc_conns[candidate]);
+ /* Todo add the context to the message queue but do not send the request
+ the receiver must send this when we are done binding */
+ /* question - how would do receiver know to which targets??? */
+ break;
+
+ case META_SEARCH_ERR:
+ Debug( LDAP_DEBUG_TRACE, "%s asyncmeta_back_compare: ERR "
+ "cnd=\"%d\"\n", op->o_log_prefix, candidate );
+ asyncmeta_error_cleanup(op, rs, bc, mc, candidate);
+ goto finish;
+ default:
+ assert( 0 );
+ break;
+ }
+
+ ldap_pvt_thread_mutex_lock( &mc->mc_om_mutex);
+ mc->mc_conns[candidate].msc_active--;
+ asyncmeta_start_one_listener(mc, candidates, bc, candidate);
+ bc->bc_active--;
+ ldap_pvt_thread_mutex_unlock( &mc->mc_om_mutex);
+ rs->sr_err = SLAPD_ASYNCOP;
+finish:
+ return rs->sr_err;
+}