Adding upstream version 2.4.57+dfsg.upstream/2.4.57+dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2141 insertions, 0 deletions

diff --git a/servers/slapd/connection.c b/servers/slapd/connection.c
new file mode 100644
index 0000000..44c3fc6
--- /dev/null
+++ b/servers/slapd/connection.c
@@ -0,0 +1,2141 @@
+/* $OpenLDAP$ */
+/* 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>.
+ */
+/* Portions Copyright (c) 1995 Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and that due credit is given
+ * to the University of Michigan at Ann Arbor. The name of the University
+ * may not be used to endorse or promote products derived from this
+ * software without specific prior written permission. This software
+ * is provided ``as is'' without express or implied warranty.
+ */
+
+#include "portable.h"
+
+#include <stdio.h>
+#ifdef HAVE_LIMITS_H
+#include <limits.h>
+#endif
+
+#include <ac/socket.h>
+#include <ac/errno.h>
+#include <ac/string.h>
+#include <ac/time.h>
+#include <ac/unistd.h>
+
+#include "lutil.h"
+#include "slap.h"
+
+#ifdef LDAP_CONNECTIONLESS
+#include "../../libraries/liblber/lber-int.h"	/* ber_int_sb_read() */
+#endif
+
+#ifdef LDAP_SLAPI
+#include "slapi/slapi.h"
+#endif
+
+/* protected by connections_mutex */
+static ldap_pvt_thread_mutex_t connections_mutex;
+static Connection *connections = NULL;
+
+static ldap_pvt_thread_mutex_t conn_nextid_mutex;
+static unsigned long conn_nextid = SLAPD_SYNC_SYNCCONN_OFFSET;
+
+static const char conn_lost_str[] = "connection lost";
+
+const char *
+connection_state2str( int state )
+{
+	switch( state ) {
+	case SLAP_C_INVALID:	return "!";
+	case SLAP_C_INACTIVE:	return "|";
+	case SLAP_C_CLOSING:	return "C";
+	case SLAP_C_ACTIVE:		return "";
+	case SLAP_C_BINDING:	return "B";
+	case SLAP_C_CLIENT:		return "L";
+	}
+
+	return "?";
+}
+
+static Connection* connection_get( ber_socket_t s );
+
+typedef struct conn_readinfo {
+	Operation *op;
+	ldap_pvt_thread_start_t *func;
+	void *arg;
+	void *ctx;
+	int nullop;
+} conn_readinfo;
+
+static int connection_input( Connection *c, conn_readinfo *cri );
+static void connection_close( Connection *c );
+
+static int connection_op_activate( Operation *op );
+static void connection_op_queue( Operation *op );
+static int connection_resched( Connection *conn );
+static void connection_abandon( Connection *conn );
+static void connection_destroy( Connection *c );
+
+static ldap_pvt_thread_start_t connection_operation;
+
+/*
+ * Initialize connection management infrastructure.
+ */
+int connections_init(void)
+{
+	int i;
+
+	assert( connections == NULL );
+
+	if( connections != NULL) {
+		Debug( LDAP_DEBUG_ANY, "connections_init: already initialized.\n",
+			0, 0, 0 );
+		return -1;
+	}
+
+	/* should check return of every call */
+	ldap_pvt_thread_mutex_init( &connections_mutex );
+	ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
+
+	connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) );
+
+	if( connections == NULL ) {
+		Debug( LDAP_DEBUG_ANY, "connections_init: "
+			"allocation (%d*%ld) of connection array failed\n",
+			dtblsize, (long) sizeof(Connection), 0 );
+		return -1;
+	}
+
+	assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
+	assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
+
+	for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i;
+
+	/*
+	 * per entry initialization of the Connection array initialization
+	 * will be done by connection_init()
+	 */ 
+
+	return 0;
+}
+
+/*
+ * Destroy connection management infrastructure.
+ */
+
+int connections_destroy(void)
+{
+	ber_socket_t i;
+
+	/* should check return of every call */
+
+	if( connections == NULL) {
+		Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
+			0, 0, 0 );
+		return -1;
+	}
+
+	for ( i = 0; i < dtblsize; i++ ) {
+		if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
+			ber_sockbuf_free( connections[i].c_sb );
+			ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
+			ldap_pvt_thread_mutex_destroy( &connections[i].c_write1_mutex );
+			ldap_pvt_thread_mutex_destroy( &connections[i].c_write2_mutex );
+			ldap_pvt_thread_cond_destroy( &connections[i].c_write1_cv );
+			ldap_pvt_thread_cond_destroy( &connections[i].c_write2_cv );
+#ifdef LDAP_SLAPI
+			if ( slapi_plugins_used ) {
+				slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
+					&connections[i] );
+			}
+#endif
+		}
+	}
+
+	free( connections );
+	connections = NULL;
+
+	ldap_pvt_thread_mutex_destroy( &connections_mutex );
+	ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
+	return 0;
+}
+
+/*
+ * shutdown all connections
+ */
+int connections_shutdown(void)
+{
+	ber_socket_t i;
+
+	for ( i = 0; i < dtblsize; i++ ) {
+		if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
+			ldap_pvt_thread_mutex_lock( &connections[i].c_mutex );
+			if( connections[i].c_struct_state == SLAP_C_USED ) {
+
+				/* give persistent clients a chance to cleanup */
+				if( connections[i].c_conn_state == SLAP_C_CLIENT ) {
+					ldap_pvt_thread_pool_submit( &connection_pool,
+					connections[i].c_clientfunc, connections[i].c_clientarg );
+				} else {
+					/* c_mutex is locked */
+					connection_closing( &connections[i], "slapd shutdown" );
+					connection_close( &connections[i] );
+				}
+			}
+			ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
+		}
+	}
+
+	return 0;
+}
+
+/*
+ * Timeout idle connections.
+ */
+int connections_timeout_idle(time_t now)
+{
+	int i = 0, writers = 0;
+	ber_socket_t connindex;
+	Connection* c;
+	time_t old;
+
+	old = slapd_get_writetime();
+
+	for( c = connection_first( &connindex );
+		c != NULL;
+		c = connection_next( c, &connindex ) )
+	{
+		/* Don't timeout a slow-running request or a persistent
+		 * outbound connection. But if it has a writewaiter, see
+		 * if the waiter has been there too long.
+		 */
+		if(( c->c_n_ops_executing && !c->c_writewaiter)
+			|| c->c_conn_state == SLAP_C_CLIENT ) {
+			continue;
+		}
+
+		if( global_idletimeout && 
+			difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
+			/* close it */
+			connection_closing( c, "idletimeout" );
+			connection_close( c );
+			i++;
+			continue;
+		}
+		if ( c->c_writewaiter && global_writetimeout ) {
+			writers = 1;
+			if( difftime( c->c_activitytime+global_writetimeout, now) < 0 ) {
+				/* close it */
+				connection_closing( c, "writetimeout" );
+				connection_close( c );
+				i++;
+				continue;
+			}
+		}
+	}
+	connection_done( c );
+	if ( old && !writers )
+		slapd_clr_writetime( old );
+
+	return i;
+}
+
+/* Drop all client connections */
+void connections_drop()
+{
+	Connection* c;
+	ber_socket_t connindex;
+
+	for( c = connection_first( &connindex );
+		c != NULL;
+		c = connection_next( c, &connindex ) )
+	{
+		/* Don't close a slow-running request or a persistent
+		 * outbound connection.
+		 */
+		if(( c->c_n_ops_executing && !c->c_writewaiter)
+			|| c->c_conn_state == SLAP_C_CLIENT ) {
+			continue;
+		}
+		connection_closing( c, "dropping" );
+		connection_close( c );
+	}
+	connection_done( c );
+}
+
+static Connection* connection_get( ber_socket_t s )
+{
+	Connection *c;
+
+	Debug( LDAP_DEBUG_ARGS,
+		"connection_get(%ld)\n",
+		(long) s, 0, 0 );
+
+	assert( connections != NULL );
+
+	if(s == AC_SOCKET_INVALID) return NULL;
+
+	assert( s < dtblsize );
+	c = &connections[s];
+
+	if( c != NULL ) {
+		ldap_pvt_thread_mutex_lock( &c->c_mutex );
+
+		assert( c->c_struct_state != SLAP_C_UNINITIALIZED );
+
+		if( c->c_struct_state != SLAP_C_USED ) {
+			/* connection must have been closed due to resched */
+
+			Debug( LDAP_DEBUG_CONNS,
+				"connection_get(%d): connection not used\n",
+				s, 0, 0 );
+			assert( c->c_conn_state == SLAP_C_INVALID );
+			assert( c->c_sd == AC_SOCKET_INVALID );
+
+			ldap_pvt_thread_mutex_unlock( &c->c_mutex );
+			return NULL;
+		}
+
+		Debug( LDAP_DEBUG_TRACE,
+			"connection_get(%d): got connid=%lu\n",
+			s, c->c_connid, 0 );
+
+		c->c_n_get++;
+
+		assert( c->c_struct_state == SLAP_C_USED );
+		assert( c->c_conn_state != SLAP_C_INVALID );
+		assert( c->c_sd != AC_SOCKET_INVALID );
+
+#ifndef SLAPD_MONITOR
+		if ( global_idletimeout > 0 )
+#endif /* ! SLAPD_MONITOR */
+		{
+			c->c_activitytime = slap_get_time();
+		}
+	}
+
+	return c;
+}
+
+static void connection_return( Connection *c )
+{
+	ldap_pvt_thread_mutex_unlock( &c->c_mutex );
+}
+
+Connection * connection_init(
+	ber_socket_t s,
+	Listener *listener,
+	const char* dnsname,
+	const char* peername,
+	int flags,
+	slap_ssf_t ssf,
+	struct berval *authid
+	LDAP_PF_LOCAL_SENDMSG_ARG(struct berval *peerbv))
+{
+	unsigned long id;
+	Connection *c;
+	int doinit = 0;
+	ber_socket_t sfd = SLAP_FD2SOCK(s);
+
+	assert( connections != NULL );
+
+	assert( listener != NULL );
+	assert( dnsname != NULL );
+	assert( peername != NULL );
+
+#ifndef HAVE_TLS
+	assert( !( flags & CONN_IS_TLS ));
+#endif
+
+	if( s == AC_SOCKET_INVALID ) {
+		Debug( LDAP_DEBUG_ANY,
+			"connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
+		return NULL;
+	}
+
+	assert( s >= 0 );
+	assert( s < dtblsize );
+	c = &connections[s];
+	if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
+		doinit = 1;
+	} else {
+		assert( c->c_struct_state == SLAP_C_UNUSED );
+	}
+
+	if( doinit ) {
+		c->c_send_ldap_result = slap_send_ldap_result;
+		c->c_send_search_entry = slap_send_search_entry;
+		c->c_send_search_reference = slap_send_search_reference;
+		c->c_send_ldap_extended = slap_send_ldap_extended;
+		c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
+
+		BER_BVZERO( &c->c_authmech );
+		BER_BVZERO( &c->c_dn );
+		BER_BVZERO( &c->c_ndn );
+
+		c->c_listener = NULL;
+		BER_BVZERO( &c->c_peer_domain );
+		BER_BVZERO( &c->c_peer_name );
+
+		LDAP_STAILQ_INIT(&c->c_ops);
+		LDAP_STAILQ_INIT(&c->c_pending_ops);
+
+#ifdef LDAP_X_TXN
+		c->c_txn = CONN_TXN_INACTIVE;
+		c->c_txn_backend = NULL;
+		LDAP_STAILQ_INIT(&c->c_txn_ops);
+#endif
+
+		BER_BVZERO( &c->c_sasl_bind_mech );
+		c->c_sasl_done = 0;
+		c->c_sasl_authctx = NULL;
+		c->c_sasl_sockctx = NULL;
+		c->c_sasl_extra = NULL;
+		c->c_sasl_bindop = NULL;
+
+		c->c_sb = ber_sockbuf_alloc( );
+
+		{
+			ber_len_t max = sockbuf_max_incoming;
+			ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
+		}
+
+		c->c_currentber = NULL;
+
+		/* should check status of thread calls */
+		ldap_pvt_thread_mutex_init( &c->c_mutex );
+		ldap_pvt_thread_mutex_init( &c->c_write1_mutex );
+		ldap_pvt_thread_mutex_init( &c->c_write2_mutex );
+		ldap_pvt_thread_cond_init( &c->c_write1_cv );
+		ldap_pvt_thread_cond_init( &c->c_write2_cv );
+
+#ifdef LDAP_SLAPI
+		if ( slapi_plugins_used ) {
+			slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
+		}
+#endif
+	}
+
+	ldap_pvt_thread_mutex_lock( &c->c_mutex );
+
+	assert( BER_BVISNULL( &c->c_authmech ) );
+	assert( BER_BVISNULL( &c->c_dn ) );
+	assert( BER_BVISNULL( &c->c_ndn ) );
+	assert( c->c_listener == NULL );
+	assert( BER_BVISNULL( &c->c_peer_domain ) );
+	assert( BER_BVISNULL( &c->c_peer_name ) );
+	assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
+	assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
+#ifdef LDAP_X_TXN
+	assert( c->c_txn == CONN_TXN_INACTIVE );
+	assert( c->c_txn_backend == NULL );
+	assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
+#endif
+	assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
+	assert( c->c_sasl_done == 0 );
+	assert( c->c_sasl_authctx == NULL );
+	assert( c->c_sasl_sockctx == NULL );
+	assert( c->c_sasl_extra == NULL );
+	assert( c->c_sasl_bindop == NULL );
+	assert( c->c_currentber == NULL );
+	assert( c->c_writewaiter == 0);
+	assert( c->c_writers == 0);
+
+	c->c_listener = listener;
+	c->c_sd = s;
+
+	if ( flags & CONN_IS_CLIENT ) {
+		c->c_connid = 0;
+		ldap_pvt_thread_mutex_lock( &connections_mutex );
+		c->c_conn_state = SLAP_C_CLIENT;
+		c->c_struct_state = SLAP_C_USED;
+		ldap_pvt_thread_mutex_unlock( &connections_mutex );
+		c->c_close_reason = "?";			/* should never be needed */
+		ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &sfd );
+		ldap_pvt_thread_mutex_unlock( &c->c_mutex );
+
+		return c;
+	}
+
+	ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
+	ber_str2bv( peername, 0, 1, &c->c_peer_name );
+
+	c->c_n_ops_received = 0;
+	c->c_n_ops_executing = 0;
+	c->c_n_ops_pending = 0;
+	c->c_n_ops_completed = 0;
+
+	c->c_n_get = 0;
+	c->c_n_read = 0;
+	c->c_n_write = 0;
+
+	/* set to zero until bind, implies LDAP_VERSION3 */
+	c->c_protocol = 0;
+
+#ifndef SLAPD_MONITOR
+	if ( global_idletimeout > 0 )
+#endif /* ! SLAPD_MONITOR */
+	{
+		c->c_activitytime = c->c_starttime = slap_get_time();
+	}
+
+#ifdef LDAP_CONNECTIONLESS
+	c->c_is_udp = 0;
+	if( flags & CONN_IS_UDP ) {
+		c->c_is_udp = 1;
+#ifdef LDAP_DEBUG
+		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
+			LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
+#endif
+		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
+			LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
+		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
+			LBER_SBIOD_LEVEL_PROVIDER, NULL );
+	} else
+#endif /* LDAP_CONNECTIONLESS */
+#ifdef LDAP_PF_LOCAL
+	if ( flags & CONN_IS_IPC ) {
+#ifdef LDAP_DEBUG
+		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
+			LBER_SBIOD_LEVEL_PROVIDER, (void*)"ipc_" );
+#endif
+		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_fd,
+			LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
+#ifdef LDAP_PF_LOCAL_SENDMSG
+		if ( !BER_BVISEMPTY( peerbv ))
+			ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_UNGET_BUF, peerbv );
+#endif
+	} else
+#endif /* LDAP_PF_LOCAL */
+	{
+#ifdef LDAP_DEBUG
+		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
+			LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
+#endif
+		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
+			LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
+	}
+
+#ifdef LDAP_DEBUG
+	ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
+		INT_MAX, (void*)"ldap_" );
+#endif
+
+	if( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_NONBLOCK,
+		c /* non-NULL */ ) < 0 )
+	{
+		Debug( LDAP_DEBUG_ANY,
+			"connection_init(%d, %s): set nonblocking failed\n",
+			s, c->c_peer_name.bv_val, 0 );
+
+		c->c_listener = NULL;
+		if(c->c_peer_domain.bv_val != NULL) {
+			free(c->c_peer_domain.bv_val);
+		}
+		BER_BVZERO( &c->c_peer_domain );
+		if(c->c_peer_name.bv_val != NULL) {
+			free(c->c_peer_name.bv_val);
+		}
+		BER_BVZERO( &c->c_peer_name );
+
+		ber_sockbuf_free( c->c_sb );
+		c->c_sb = NULL;
+		c->c_sd = AC_SOCKET_INVALID;
+		ldap_pvt_thread_mutex_unlock( &c->c_mutex );
+
+		return NULL;
+	}
+
+	ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
+	id = c->c_connid = conn_nextid++;
+	ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
+
+	ldap_pvt_thread_mutex_lock( &connections_mutex );
+	c->c_conn_state = SLAP_C_INACTIVE;
+	c->c_struct_state = SLAP_C_USED;
+	ldap_pvt_thread_mutex_unlock( &connections_mutex );
+	c->c_close_reason = "?";			/* should never be needed */
+
+	c->c_ssf = c->c_transport_ssf = ssf;
+	c->c_tls_ssf = c->c_sasl_ssf = 0;
+
+#ifdef HAVE_TLS
+	if ( flags & CONN_IS_TLS ) {
+		c->c_is_tls = 1;
+		c->c_needs_tls_accept = 1;
+	} else {
+		c->c_is_tls = 0;
+		c->c_needs_tls_accept = 0;
+	}
+#endif
+
+	slap_sasl_open( c, 0 );
+	slap_sasl_external( c, ssf, authid );
+
+	slapd_add_internal( s, 1 );
+
+	backend_connection_init(c);
+	ldap_pvt_thread_mutex_unlock( &c->c_mutex );
+
+	if ( !(flags & CONN_IS_UDP ))
+		Statslog( LDAP_DEBUG_STATS,
+			"conn=%ld fd=%ld ACCEPT from %s (%s)\n",
+			id, (long) s, peername, listener->sl_name.bv_val, 0 );
+
+	return c;
+}
+
+void connection2anonymous( Connection *c )
+{
+	assert( connections != NULL );
+	assert( c != NULL );
+
+	{
+		ber_len_t max = sockbuf_max_incoming;
+		ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
+	}
+
+	if ( !BER_BVISNULL( &c->c_authmech ) ) {
+		ch_free(c->c_authmech.bv_val);
+	}
+	BER_BVZERO( &c->c_authmech );
+
+	if ( !BER_BVISNULL( &c->c_dn ) ) {
+		ch_free(c->c_dn.bv_val);
+	}
+	BER_BVZERO( &c->c_dn );
+
+	if ( !BER_BVISNULL( &c->c_ndn ) ) {
+		ch_free(c->c_ndn.bv_val);
+	}
+	BER_BVZERO( &c->c_ndn );
+
+	if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
+		ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
+	}
+	BER_BVZERO( &c->c_sasl_authz_dn );
+
+	c->c_authz_backend = NULL;
+}
+
+static void
+connection_destroy( Connection *c )
+{
+	unsigned long	connid;
+	const char		*close_reason;
+	Sockbuf			*sb;
+	ber_socket_t	sd;
+
+	assert( connections != NULL );
+	assert( c != NULL );
+	assert( c->c_struct_state != SLAP_C_UNUSED );
+	assert( c->c_conn_state != SLAP_C_INVALID );
+	assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
+	assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
+#ifdef LDAP_X_TXN
+	assert( c->c_txn == CONN_TXN_INACTIVE );
+	assert( c->c_txn_backend == NULL );
+	assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
+#endif
+	assert( c->c_writewaiter == 0);
+	assert( c->c_writers == 0);
+
+	/* only for stats (print -1 as "%lu" may give unexpected results ;) */
+	connid = c->c_connid;
+	close_reason = c->c_close_reason;
+
+	ldap_pvt_thread_mutex_lock( &connections_mutex );
+	c->c_struct_state = SLAP_C_PENDING;
+	ldap_pvt_thread_mutex_unlock( &connections_mutex );
+
+	backend_connection_destroy(c);
+
+	c->c_protocol = 0;
+	c->c_connid = -1;
+
+	c->c_activitytime = c->c_starttime = 0;
+
+	connection2anonymous( c );
+	c->c_listener = NULL;
+
+	if(c->c_peer_domain.bv_val != NULL) {
+		free(c->c_peer_domain.bv_val);
+	}
+	BER_BVZERO( &c->c_peer_domain );
+	if(c->c_peer_name.bv_val != NULL) {
+		free(c->c_peer_name.bv_val);
+	}
+	BER_BVZERO( &c->c_peer_name );
+
+	c->c_sasl_bind_in_progress = 0;
+	if(c->c_sasl_bind_mech.bv_val != NULL) {
+		free(c->c_sasl_bind_mech.bv_val);
+	}
+	BER_BVZERO( &c->c_sasl_bind_mech );
+
+	slap_sasl_close( c );
+
+	if ( c->c_currentber != NULL ) {
+		ber_free( c->c_currentber, 1 );
+		c->c_currentber = NULL;
+	}
+
+
+#ifdef LDAP_SLAPI
+	/* call destructors, then constructors; avoids unnecessary allocation */
+	if ( slapi_plugins_used ) {
+		slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
+	}
+#endif
+
+	sd = c->c_sd;
+	c->c_sd = AC_SOCKET_INVALID;
+	c->c_conn_state = SLAP_C_INVALID;
+	c->c_struct_state = SLAP_C_UNUSED;
+	c->c_close_reason = "?";			/* should never be needed */
+
+	sb = c->c_sb;
+	c->c_sb = ber_sockbuf_alloc( );
+	{
+		ber_len_t max = sockbuf_max_incoming;
+		ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
+	}
+
+	/* c must be fully reset by this point; when we call slapd_remove
+	 * it may get immediately reused by a new connection.
+	 */
+	if ( sd != AC_SOCKET_INVALID ) {
+		slapd_remove( sd, sb, 1, 0, 0 );
+
+		if ( close_reason == NULL ) {
+			Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed\n",
+				connid, (long) sd, 0, 0, 0 );
+		} else {
+			Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
+				connid, (long) sd, close_reason, 0, 0 );
+		}
+	}
+}
+
+int connection_valid( Connection *c )
+{
+	/* c_mutex must be locked by caller */
+
+	assert( c != NULL );
+
+	return c->c_struct_state == SLAP_C_USED &&
+		c->c_conn_state >= SLAP_C_ACTIVE &&
+		c->c_conn_state <= SLAP_C_CLIENT;
+}
+
+static void connection_abandon( Connection *c )
+{
+	/* c_mutex must be locked by caller */
+
+	Operation *o, *next, op = {0};
+	Opheader ohdr = {0};
+
+	op.o_hdr = &ohdr;
+	op.o_conn = c;
+	op.o_connid = c->c_connid;
+	op.o_tag = LDAP_REQ_ABANDON;
+
+	for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
+		SlapReply rs = {REP_RESULT};
+
+		next = LDAP_STAILQ_NEXT( o, o_next );
+		/* don't abandon an op twice */
+		if ( o->o_abandon )
+			continue;
+		op.orn_msgid = o->o_msgid;
+		o->o_abandon = 1;
+		op.o_bd = frontendDB;
+		frontendDB->be_abandon( &op, &rs );
+	}
+
+#ifdef LDAP_X_TXN
+	/* remove operations in pending transaction */
+	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 );
+	}
+
+	/* clear transaction */
+	c->c_txn_backend = NULL;
+	c->c_txn = CONN_TXN_INACTIVE;
+#endif
+
+	/* remove pending operations */
+	while ( (o = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
+		LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
+		LDAP_STAILQ_NEXT(o, o_next) = NULL;
+		slap_op_free( o, NULL );
+	}
+}
+
+static void
+connection_wake_writers( Connection *c )
+{
+	/* wake write blocked operations */
+	ldap_pvt_thread_mutex_lock( &c->c_write1_mutex );
+	if ( c->c_writers > 0 ) {
+		c->c_writers = -c->c_writers;
+		ldap_pvt_thread_cond_broadcast( &c->c_write1_cv );
+		ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
+		if ( c->c_writewaiter ) {
+			ldap_pvt_thread_mutex_lock( &c->c_write2_mutex );
+			ldap_pvt_thread_cond_signal( &c->c_write2_cv );
+			slapd_clr_write( c->c_sd, 1 );
+			ldap_pvt_thread_mutex_unlock( &c->c_write2_mutex );
+		}
+		ldap_pvt_thread_mutex_lock( &c->c_write1_mutex );
+		while ( c->c_writers ) {
+			ldap_pvt_thread_cond_wait( &c->c_write1_cv, &c->c_write1_mutex );
+		}
+		ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
+	} else {
+		ldap_pvt_thread_mutex_unlock( &c->c_write1_mutex );
+		slapd_clr_write( c->c_sd, 1 );
+	}
+}
+
+void connection_closing( Connection *c, const char *why )
+{
+	assert( connections != NULL );
+	assert( c != NULL );
+
+	if ( c->c_struct_state != SLAP_C_USED ) return;
+
+	assert( c->c_conn_state != SLAP_C_INVALID );
+
+	/* c_mutex must be locked by caller */
+
+	if( c->c_conn_state != SLAP_C_CLOSING ) {
+		Debug( LDAP_DEBUG_CONNS,
+			"connection_closing: readying conn=%lu sd=%d for close\n",
+			c->c_connid, c->c_sd, 0 );
+		/* update state to closing */
+		c->c_conn_state = SLAP_C_CLOSING;
+		c->c_close_reason = why;
+
+		/* don't listen on this port anymore */
+		slapd_clr_read( c->c_sd, 0 );
+
+		/* abandon active operations */
+		connection_abandon( c );
+
+		/* wake write blocked operations */
+		connection_wake_writers( c );
+
+	} else if( why == NULL && c->c_close_reason == conn_lost_str ) {
+		/* Client closed connection after doing Unbind. */
+		c->c_close_reason = NULL;
+	}
+}
+
+static void
+connection_close( Connection *c )
+{
+	assert( connections != NULL );
+	assert( c != NULL );
+
+	if ( c->c_struct_state != SLAP_C_USED ) return;
+
+	assert( c->c_conn_state == SLAP_C_CLOSING );
+
+	/* NOTE: c_mutex should be locked by caller */
+
+	if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
+		!LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
+	{
+		Debug( LDAP_DEBUG_CONNS,
+			"connection_close: deferring conn=%lu sd=%d\n",
+			c->c_connid, c->c_sd, 0 );
+		return;
+	}
+
+	Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
+		c->c_connid, c->c_sd, 0 );
+
+	connection_destroy( c );
+}
+
+unsigned long connections_nextid(void)
+{
+	unsigned long id;
+	assert( connections != NULL );
+
+	ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
+
+	id = conn_nextid;
+
+	ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
+
+	return id;
+}
+
+/*
+ * Loop through the connections:
+ *
+ *	for (c = connection_first(&i); c; c = connection_next(c, &i)) ...;
+ *	connection_done(c);
+ *
+ * 'i' is the cursor, initialized by connection_first().
+ * 'c_mutex' is locked in the returned connection.  The functions must
+ * be passed the previous return value so they can unlock it again.
+ */
+
+Connection* connection_first( ber_socket_t *index )
+{
+	assert( connections != NULL );
+	assert( index != NULL );
+
+	ldap_pvt_thread_mutex_lock( &connections_mutex );
+	for( *index = 0; *index < dtblsize; (*index)++) {
+		if( connections[*index].c_struct_state != SLAP_C_UNINITIALIZED ) {
+			break;
+		}
+	}
+	ldap_pvt_thread_mutex_unlock( &connections_mutex );
+
+	return connection_next(NULL, index);
+}
+
+/* Next connection in loop, see connection_first() */
+Connection* connection_next( Connection *c, ber_socket_t *index )
+{
+	assert( connections != NULL );
+	assert( index != NULL );
+	assert( *index <= dtblsize );
+
+	if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
+
+	c = NULL;
+
+	ldap_pvt_thread_mutex_lock( &connections_mutex );
+	for(; *index < dtblsize; (*index)++) {
+		int c_struct;
+		if( connections[*index].c_struct_state == SLAP_C_UNINITIALIZED ) {
+			/* FIXME: accessing c_conn_state without locking c_mutex */
+			assert( connections[*index].c_conn_state == SLAP_C_INVALID );
+			continue;
+		}
+
+		if( connections[*index].c_struct_state == SLAP_C_USED ) {
+			c = &connections[(*index)++];
+			if ( ldap_pvt_thread_mutex_trylock( &c->c_mutex )) {
+				/* avoid deadlock */
+				ldap_pvt_thread_mutex_unlock( &connections_mutex );
+				ldap_pvt_thread_mutex_lock( &c->c_mutex );
+				ldap_pvt_thread_mutex_lock( &connections_mutex );
+				if ( c->c_struct_state != SLAP_C_USED ) {
+					ldap_pvt_thread_mutex_unlock( &c->c_mutex );
+					c = NULL;
+					continue;
+				}
+			}
+			assert( c->c_conn_state != SLAP_C_INVALID );
+			break;
+		}
+
+		c_struct = connections[*index].c_struct_state;
+		if ( c_struct == SLAP_C_PENDING )
+			continue;
+		assert( c_struct == SLAP_C_UNUSED );
+		/* FIXME: accessing c_conn_state without locking c_mutex */
+		assert( connections[*index].c_conn_state == SLAP_C_INVALID );
+	}
+
+	ldap_pvt_thread_mutex_unlock( &connections_mutex );
+	return c;
+}
+
+/* End connection loop, see connection_first() */
+void connection_done( Connection *c )
+{
+	assert( connections != NULL );
+
+	if( c != NULL ) ldap_pvt_thread_mutex_unlock( &c->c_mutex );
+}
+
+/*
+ * connection_activity - handle the request operation op on connection
+ * conn.  This routine figures out what kind of operation it is and
+ * calls the appropriate stub to handle it.
+ */
+
+#ifdef SLAPD_MONITOR
+/* FIXME: returns 0 in case of failure */
+#define INCR_OP_INITIATED(index) \
+	do { \
+		ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
+		ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated_[(index)], 1); \
+		ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
+	} while (0)
+#define INCR_OP_COMPLETED(index) \
+	do { \
+		ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
+		ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
+		ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed_[(index)], 1); \
+		ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
+	} while (0)
+#else /* !SLAPD_MONITOR */
+#define INCR_OP_INITIATED(index) do { } while (0)
+#define INCR_OP_COMPLETED(index) \
+	do { \
+		ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex ); \
+		ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_completed, 1); \
+		ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex ); \
+	} while (0)
+#endif /* !SLAPD_MONITOR */
+
+/*
+ * NOTE: keep in sync with enum in slapd.h
+ */
+static BI_op_func *opfun[] = {
+	do_bind,
+	do_unbind,
+	do_search,
+	do_compare,
+	do_modify,
+	do_modrdn,
+	do_add,
+	do_delete,
+	do_abandon,
+	do_extended,
+	NULL
+};
+
+/* Counters are per-thread, not per-connection.
+ */
+static void
+conn_counter_destroy( void *key, void *data )
+{
+	slap_counters_t **prev, *sc;
+
+	ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
+	for ( prev = &slap_counters.sc_next, sc = slap_counters.sc_next; sc;
+		prev = &sc->sc_next, sc = sc->sc_next ) {
+		if ( sc == data ) {
+			int i;
+
+			*prev = sc->sc_next;
+			/* Copy data to main counter */
+			ldap_pvt_mp_add( slap_counters.sc_bytes, sc->sc_bytes );
+			ldap_pvt_mp_add( slap_counters.sc_pdu, sc->sc_pdu );
+			ldap_pvt_mp_add( slap_counters.sc_entries, sc->sc_entries );
+			ldap_pvt_mp_add( slap_counters.sc_refs, sc->sc_refs );
+			ldap_pvt_mp_add( slap_counters.sc_ops_initiated, sc->sc_ops_initiated );
+			ldap_pvt_mp_add( slap_counters.sc_ops_completed, sc->sc_ops_completed );
+#ifdef SLAPD_MONITOR
+			for ( i = 0; i < SLAP_OP_LAST; i++ ) {
+				ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_initiated_[ i ] );
+				ldap_pvt_mp_add( slap_counters.sc_ops_initiated_[ i ], sc->sc_ops_completed_[ i ] );
+			}
+#endif /* SLAPD_MONITOR */
+			slap_counters_destroy( sc );
+			ber_memfree_x( data, NULL );
+			break;
+		}
+	}
+	ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
+}
+
+static void
+conn_counter_init( Operation *op, void *ctx )
+{
+	slap_counters_t *sc;
+	void *vsc = NULL;
+
+	if ( ldap_pvt_thread_pool_getkey(
+			ctx, (void *)conn_counter_init, &vsc, NULL ) || !vsc ) {
+		vsc = ch_malloc( sizeof( slap_counters_t ));
+		sc = vsc;
+		slap_counters_init( sc );
+		ldap_pvt_thread_pool_setkey( ctx, (void*)conn_counter_init, vsc,
+			conn_counter_destroy, NULL, NULL );
+
+		ldap_pvt_thread_mutex_lock( &slap_counters.sc_mutex );
+		sc->sc_next = slap_counters.sc_next;
+		slap_counters.sc_next = sc;
+		ldap_pvt_thread_mutex_unlock( &slap_counters.sc_mutex );
+	}
+	op->o_counters = vsc;
+}
+
+static void *
+connection_operation( void *ctx, void *arg_v )
+{
+	int rc = LDAP_OTHER, cancel;
+	Operation *op = arg_v;
+	SlapReply rs = {REP_RESULT};
+	ber_tag_t tag = op->o_tag;
+	slap_op_t opidx = SLAP_OP_LAST;
+	Connection *conn = op->o_conn;
+	void *memctx = NULL;
+	void *memctx_null = NULL;
+	ber_len_t memsiz;
+
+	conn_counter_init( op, ctx );
+	ldap_pvt_thread_mutex_lock( &op->o_counters->sc_mutex );
+	/* FIXME: returns 0 in case of failure */
+	ldap_pvt_mp_add_ulong(op->o_counters->sc_ops_initiated, 1);
+	ldap_pvt_thread_mutex_unlock( &op->o_counters->sc_mutex );
+
+	op->o_threadctx = ctx;
+	op->o_tid = ldap_pvt_thread_pool_tid( ctx );
+
+	switch ( tag ) {
+	case LDAP_REQ_BIND:
+	case LDAP_REQ_UNBIND:
+	case LDAP_REQ_ADD:
+	case LDAP_REQ_DELETE:
+	case LDAP_REQ_MODDN:
+	case LDAP_REQ_MODIFY:
+	case LDAP_REQ_COMPARE:
+	case LDAP_REQ_SEARCH:
+	case LDAP_REQ_ABANDON:
+	case LDAP_REQ_EXTENDED:
+		break;
+	default:
+		Debug( LDAP_DEBUG_ANY, "connection_operation: "
+			"conn %lu unknown LDAP request 0x%lx\n",
+			conn->c_connid, tag, 0 );
+		op->o_tag = LBER_ERROR;
+		rs.sr_err = LDAP_PROTOCOL_ERROR;
+		rs.sr_text = "unknown LDAP request";
+		send_ldap_disconnect( op, &rs );
+		rc = SLAPD_DISCONNECT;
+		goto operations_error;
+	}
+
+	if( conn->c_sasl_bind_in_progress && tag != LDAP_REQ_BIND ) {
+		Debug( LDAP_DEBUG_ANY, "connection_operation: "
+			"error: SASL bind in progress (tag=%ld).\n",
+			(long) tag, 0, 0 );
+		send_ldap_error( op, &rs, LDAP_OPERATIONS_ERROR,
+			"SASL bind in progress" );
+		rc = LDAP_OPERATIONS_ERROR;
+		goto operations_error;
+	}
+
+#ifdef LDAP_X_TXN
+	if (( conn->c_txn == CONN_TXN_SPECIFY ) && (
+		( tag == LDAP_REQ_ADD ) ||
+		( tag == LDAP_REQ_DELETE ) ||
+		( tag == LDAP_REQ_MODIFY ) ||
+		( tag == LDAP_REQ_MODRDN )))
+	{
+		/* Disable SLAB allocator for all update operations
+			issued inside of a transaction */
+		op->o_tmpmemctx = NULL;
+		op->o_tmpmfuncs = &ch_mfuncs;
+	} else
+#endif
+	{
+	/* We can use Thread-Local storage for most mallocs. We can
+	 * also use TL for ber parsing, but not on Add or Modify.
+	 */
+#if 0
+	memsiz = ber_len( op->o_ber ) * 64;
+	if ( SLAP_SLAB_SIZE > memsiz ) memsiz = SLAP_SLAB_SIZE;
+#endif
+	memsiz = SLAP_SLAB_SIZE;
+
+	memctx = slap_sl_mem_create( memsiz, SLAP_SLAB_STACK, ctx, 1 );
+	op->o_tmpmemctx = memctx;
+	op->o_tmpmfuncs = &slap_sl_mfuncs;
+	if ( tag != LDAP_REQ_ADD && tag != LDAP_REQ_MODIFY ) {
+		/* Note - the ber and its buffer are already allocated from
+		 * regular memory; this only affects subsequent mallocs that
+		 * ber_scanf may invoke.
+		 */
+		ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx );
+	}
+	}
+
+	opidx = slap_req2op( tag );
+	assert( opidx != SLAP_OP_LAST );
+	INCR_OP_INITIATED( opidx );
+	rc = (*(opfun[opidx]))( op, &rs );
+
+operations_error:
+	if ( rc == SLAPD_DISCONNECT ) {
+		tag = LBER_ERROR;
+
+	} else if ( opidx != SLAP_OP_LAST ) {
+		/* increment completed operations count 
+		 * only if operation was initiated
+		 * and rc != SLAPD_DISCONNECT */
+		INCR_OP_COMPLETED( opidx );
+	}
+
+	ldap_pvt_thread_mutex_lock( &conn->c_mutex );
+
+	if ( opidx == SLAP_OP_BIND && conn->c_conn_state == SLAP_C_BINDING )
+		conn->c_conn_state = SLAP_C_ACTIVE;
+
+	cancel = op->o_cancel;
+	if ( cancel != SLAP_CANCEL_NONE && cancel != SLAP_CANCEL_DONE ) {
+		if ( cancel == SLAP_CANCEL_REQ ) {
+			op->o_cancel = rc == SLAPD_ABANDON
+				? SLAP_CANCEL_ACK : LDAP_TOO_LATE;
+		}
+
+		do {
+			/* Fake a cond_wait with thread_yield, then
+			 * verify the result properly mutex-protected.
+			 */
+			ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
+			do {
+				ldap_pvt_thread_yield();
+			} while ( (cancel = op->o_cancel) != SLAP_CANCEL_NONE
+					&& cancel != SLAP_CANCEL_DONE );
+			ldap_pvt_thread_mutex_lock( &conn->c_mutex );
+		} while ( (cancel = op->o_cancel) != SLAP_CANCEL_NONE
+				&& cancel != SLAP_CANCEL_DONE );
+	}
+
+	ber_set_option( op->o_ber, LBER_OPT_BER_MEMCTX, &memctx_null );
+
+	LDAP_STAILQ_REMOVE( &conn->c_ops, op, Operation, o_next);
+	LDAP_STAILQ_NEXT(op, o_next) = NULL;
+	conn->c_n_ops_executing--;
+	conn->c_n_ops_completed++;
+
+	switch( tag ) {
+	case LBER_ERROR:
+	case LDAP_REQ_UNBIND:
+		/* c_mutex is locked */
+		connection_closing( conn,
+			tag == LDAP_REQ_UNBIND ? NULL : "operations error" );
+		break;
+	}
+
+	connection_resched( conn );
+	ldap_pvt_thread_mutex_unlock( &conn->c_mutex );
+	slap_op_free( op, ctx );
+	return NULL;
+}
+
+static const Listener dummy_list = { BER_BVC(""), BER_BVC("") };
+
+Connection *connection_client_setup(
+	ber_socket_t s,
+	ldap_pvt_thread_start_t *func,
+	void *arg )
+{
+	Connection *c;
+	ber_socket_t sfd = SLAP_SOCKNEW( s );
+
+	c = connection_init( sfd, (Listener *)&dummy_list, "", "",
+		CONN_IS_CLIENT, 0, NULL
+		LDAP_PF_LOCAL_SENDMSG_ARG(NULL));
+	if ( c ) {
+		c->c_clientfunc = func;
+		c->c_clientarg = arg;
+
+		slapd_add_internal( sfd, 0 );
+	}
+	return c;
+}
+
+void connection_client_enable(
+	Connection *c )
+{
+	slapd_set_read( c->c_sd, 1 );
+}
+
+void connection_client_stop(
+	Connection *c )
+{
+	Sockbuf *sb;
+	ber_socket_t s = c->c_sd;
+
+	/* get (locked) connection */
+	c = connection_get( s );
+
+	assert( c->c_conn_state == SLAP_C_CLIENT );
+
+	c->c_listener = NULL;
+	c->c_conn_state = SLAP_C_INVALID;
+	c->c_struct_state = SLAP_C_UNUSED;
+	c->c_sd = AC_SOCKET_INVALID;
+	c->c_close_reason = "?";			/* should never be needed */
+	sb = c->c_sb;
+	c->c_sb = ber_sockbuf_alloc( );
+	{
+		ber_len_t max = sockbuf_max_incoming;
+		ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
+	}
+	slapd_remove( s, sb, 0, 1, 0 );
+
+	connection_return( c );
+}
+
+static int connection_read( ber_socket_t s, conn_readinfo *cri );
+
+static void* connection_read_thread( void* ctx, void* argv )
+{
+	int rc ;
+	conn_readinfo cri = { NULL, NULL, NULL, NULL, 0 };
+	ber_socket_t s = (long)argv;
+
+	/*
+	 * read incoming LDAP requests. If there is more than one,
+	 * the first one is returned with new_op
+	 */
+	cri.ctx = ctx;
+	if( ( rc = connection_read( s, &cri ) ) < 0 ) {
+		Debug( LDAP_DEBUG_CONNS, "connection_read(%d) error\n", s, 0, 0 );
+		return (void*)(long)rc;
+	}
+
+	/* execute a single queued request in the same thread */
+	if( cri.op && !cri.nullop ) {
+		rc = (long)connection_operation( ctx, cri.op );
+	} else if ( cri.func ) {
+		rc = (long)cri.func( ctx, cri.arg );
+	}
+
+	return (void*)(long)rc;
+}
+
+int connection_read_activate( ber_socket_t s )
+{
+	int rc;
+
+	/*
+	 * suspend reading on this file descriptor until a connection processing
+	 * thread reads data on it. Otherwise the listener thread will repeatedly
+	 * submit the same event on it to the pool.
+	 */
+	rc = slapd_clr_read( s, 0 );
+	if ( rc )
+		return rc;
+
+	/* Don't let blocked writers block a pause request */
+	if ( connections[s].c_writewaiter &&
+		ldap_pvt_thread_pool_pausing( &connection_pool ))
+		connection_wake_writers( &connections[s] );
+
+	rc = ldap_pvt_thread_pool_submit( &connection_pool,
+		connection_read_thread, (void *)(long)s );
+
+	if( rc != 0 ) {
+		Debug( LDAP_DEBUG_ANY,
+			"connection_read_activate(%d): submit failed (%d)\n",
+			s, rc, 0 );
+	}
+
+	return rc;
+}
+
+static int
+connection_read( ber_socket_t s, conn_readinfo *cri )
+{
+	int rc = 0;
+	Connection *c;
+
+	assert( connections != NULL );
+
+	/* get (locked) connection */
+	c = connection_get( s );
+
+	if( c == NULL ) {
+		Debug( LDAP_DEBUG_ANY,
+			"connection_read(%ld): no connection!\n",
+			(long) s, 0, 0 );
+
+		return -1;
+	}
+
+	c->c_n_read++;
+
+	if( c->c_conn_state == SLAP_C_CLOSING ) {
+		Debug( LDAP_DEBUG_CONNS,
+			"connection_read(%d): closing, ignoring input for id=%lu\n",
+			s, c->c_connid, 0 );
+		connection_return( c );
+		return 0;
+	}
+
+	if ( c->c_conn_state == SLAP_C_CLIENT ) {
+		cri->func = c->c_clientfunc;
+		cri->arg = c->c_clientarg;
+		/* read should already be cleared */
+		connection_return( c );
+		return 0;
+	}
+
+	Debug( LDAP_DEBUG_TRACE,
+		"connection_read(%d): checking for input on id=%lu\n",
+		s, c->c_connid, 0 );
+
+#ifdef HAVE_TLS
+	if ( c->c_is_tls && c->c_needs_tls_accept ) {
+		rc = ldap_pvt_tls_accept( c->c_sb, slap_tls_ctx );
+		if ( rc < 0 ) {
+			Debug( LDAP_DEBUG_TRACE,
+				"connection_read(%d): TLS accept failure "
+				"error=%d id=%lu, closing\n",
+				s, rc, c->c_connid );
+
+			c->c_needs_tls_accept = 0;
+			/* c_mutex is locked */
+			connection_closing( c, "TLS negotiation failure" );
+			connection_close( c );
+			connection_return( c );
+			return 0;
+
+		} else if ( rc == 0 ) {
+			void *ssl;
+			struct berval authid = BER_BVNULL;
+
+			c->c_needs_tls_accept = 0;
+
+			/* we need to let SASL know */
+			ssl = ldap_pvt_tls_sb_ctx( c->c_sb );
+
+			c->c_tls_ssf = (slap_ssf_t) ldap_pvt_tls_get_strength( ssl );
+			if( c->c_tls_ssf > c->c_ssf ) {
+				c->c_ssf = c->c_tls_ssf;
+			}
+
+			rc = dnX509peerNormalize( ssl, &authid );
+			if ( rc != LDAP_SUCCESS ) {
+				Debug( LDAP_DEBUG_TRACE, "connection_read(%d): "
+					"unable to get TLS client DN, error=%d id=%lu\n",
+					s, rc, c->c_connid );
+			}
+			Statslog( LDAP_DEBUG_STATS,
+				"conn=%lu fd=%d TLS established tls_ssf=%u ssf=%u\n",
+			    c->c_connid, (int) s, c->c_tls_ssf, c->c_ssf, 0 );
+			slap_sasl_external( c, c->c_tls_ssf, &authid );
+			if ( authid.bv_val ) free( authid.bv_val );
+		} else if ( rc == 1 && ber_sockbuf_ctrl( c->c_sb,
+			LBER_SB_OPT_NEEDS_WRITE, NULL )) {	/* need to retry */
+			slapd_set_write( s, 1 );
+			connection_return( c );
+			return 0;
+		}
+
+		/* if success and data is ready, fall thru to data input loop */
+		if( !ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ) )
+		{
+			slapd_set_read( s, 1 );
+			connection_return( c );
+			return 0;
+		}
+	}
+#endif
+
+#ifdef HAVE_CYRUS_SASL
+	if ( c->c_sasl_layers ) {
+		/* If previous layer is not removed yet, give up for now */
+		if ( !c->c_sasl_sockctx ) {
+			slapd_set_read( s, 1 );
+			connection_return( c );
+			return 0;
+		}
+
+		c->c_sasl_layers = 0;
+
+		rc = ldap_pvt_sasl_install( c->c_sb, c->c_sasl_sockctx );
+		if( rc != LDAP_SUCCESS ) {
+			Debug( LDAP_DEBUG_TRACE,
+				"connection_read(%d): SASL install error "
+				"error=%d id=%lu, closing\n",
+				s, rc, c->c_connid );
+
+			/* c_mutex is locked */
+			connection_closing( c, "SASL layer install failure" );
+			connection_close( c );
+			connection_return( c );
+			return 0;
+		}
+	}
+#endif
+
+#define CONNECTION_INPUT_LOOP 1
+/* #define	DATA_READY_LOOP 1 */
+
+	do {
+		/* How do we do this without getting into a busy loop ? */
+		rc = connection_input( c, cri );
+	}
+#ifdef DATA_READY_LOOP
+	while( !rc && ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_DATA_READY, NULL ));
+#elif defined CONNECTION_INPUT_LOOP
+	while(!rc);
+#else
+	while(0);
+#endif
+
+	if( rc < 0 ) {
+		Debug( LDAP_DEBUG_CONNS,
+			"connection_read(%d): input error=%d id=%lu, closing.\n",
+			s, rc, c->c_connid );
+
+		/* c_mutex is locked */
+		connection_closing( c, conn_lost_str );
+		connection_close( c );
+		connection_return( c );
+		return 0;
+	}
+
+	if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
+		slapd_set_write( s, 0 );
+	}
+
+	slapd_set_read( s, 1 );
+	connection_return( c );
+
+	return 0;
+}
+
+static int
+connection_input( Connection *conn , conn_readinfo *cri )
+{
+	Operation *op;
+	ber_tag_t	tag;
+	ber_len_t	len;
+	ber_int_t	msgid;
+	BerElement	*ber;
+	int 		rc;
+#ifdef LDAP_CONNECTIONLESS
+	Sockaddr	peeraddr;
+	char 		*cdn = NULL;
+#endif
+	char *defer = NULL;
+	void *ctx;
+
+	if ( conn->c_currentber == NULL &&
+		( conn->c_currentber = ber_alloc()) == NULL )
+	{
+		Debug( LDAP_DEBUG_ANY, "ber_alloc failed\n", 0, 0, 0 );
+		return -1;
+	}
+
+	sock_errset(0);
+
+#ifdef LDAP_CONNECTIONLESS
+	if ( conn->c_is_udp ) {
+#if defined(LDAP_PF_INET6)
+		char peername[sizeof("IP=[ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff]:65535")];
+		char addr[INET6_ADDRSTRLEN];
+#else
+		char peername[sizeof("IP=255.255.255.255:65336")];
+		char addr[INET_ADDRSTRLEN];
+#endif
+		const char *peeraddr_string = NULL;
+
+		len = ber_int_sb_read(conn->c_sb, &peeraddr, sizeof(Sockaddr));
+		if (len != sizeof(Sockaddr)) return 1;
+
+#if defined(LDAP_PF_INET6)
+		if (peeraddr.sa_addr.sa_family == AF_INET6) {
+			if ( IN6_IS_ADDR_V4MAPPED(&peeraddr.sa_in6_addr.sin6_addr) ) {
+#if defined( HAVE_GETADDRINFO ) && defined( HAVE_INET_NTOP )
+				peeraddr_string = inet_ntop( AF_INET,
+				   ((struct in_addr *)&peeraddr.sa_in6_addr.sin6_addr.s6_addr[12]),
+				   addr, sizeof(addr) );
+#else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
+				peeraddr_string = inet_ntoa( *((struct in_addr *)
+					&peeraddr.sa_in6_addr.sin6_addr.s6_addr[12]) );
+#endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
+				if ( !peeraddr_string ) peeraddr_string = SLAP_STRING_UNKNOWN;
+				sprintf( peername, "IP=%s:%d", peeraddr_string,
+					(unsigned) ntohs( peeraddr.sa_in6_addr.sin6_port ) );
+			} else {
+				peeraddr_string = inet_ntop( AF_INET6,
+				      &peeraddr.sa_in6_addr.sin6_addr,
+				      addr, sizeof addr );
+				if ( !peeraddr_string ) peeraddr_string = SLAP_STRING_UNKNOWN;
+				sprintf( peername, "IP=[%s]:%d", peeraddr_string,
+					 (unsigned) ntohs( peeraddr.sa_in6_addr.sin6_port ) );
+			}
+		} else
+#endif
+#if defined( HAVE_GETADDRINFO ) && defined( HAVE_INET_NTOP )
+		{
+			peeraddr_string = inet_ntop( AF_INET, &peeraddr.sa_in_addr.sin_addr,
+			   addr, sizeof(addr) );
+#else /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
+			peeraddr_string = inet_ntoa( peeraddr.sa_in_addr.sin_addr );
+#endif /* ! HAVE_GETADDRINFO || ! HAVE_INET_NTOP */
+			sprintf( peername, "IP=%s:%d",
+				 peeraddr_string,
+				(unsigned) ntohs( peeraddr.sa_in_addr.sin_port ) );
+		}
+		Statslog( LDAP_DEBUG_STATS,
+			"conn=%lu UDP request from %s (%s) accepted.\n",
+			conn->c_connid, peername, conn->c_sock_name.bv_val, 0, 0 );
+	}
+#endif
+
+	tag = ber_get_next( conn->c_sb, &len, conn->c_currentber );
+	if ( tag != LDAP_TAG_MESSAGE ) {
+		int err = sock_errno();
+
+		if ( err != EWOULDBLOCK && err != EAGAIN ) {
+			/* log, close and send error */
+			Debug( LDAP_DEBUG_TRACE,
+				"ber_get_next on fd %d failed errno=%d (%s)\n",
+			conn->c_sd, err, sock_errstr(err) );
+			ber_free( conn->c_currentber, 1 );
+			conn->c_currentber = NULL;
+
+			return -2;
+		}
+		return 1;
+	}
+
+	ber = conn->c_currentber;
+	conn->c_currentber = NULL;
+
+	if ( (tag = ber_get_int( ber, &msgid )) != LDAP_TAG_MSGID ) {
+		/* log, close and send error */
+		Debug( LDAP_DEBUG_ANY, "ber_get_int returns 0x%lx\n", tag, 0, 0 );
+		ber_free( ber, 1 );
+		return -1;
+	}
+
+	if ( (tag = ber_peek_tag( ber, &len )) == LBER_ERROR ) {
+		/* log, close and send error */
+		Debug( LDAP_DEBUG_ANY, "ber_peek_tag returns 0x%lx\n", tag, 0, 0 );
+		ber_free( ber, 1 );
+
+		return -1;
+	}
+
+#ifdef LDAP_CONNECTIONLESS
+	if( conn->c_is_udp ) {
+		if( tag == LBER_OCTETSTRING ) {
+			if ( (tag = ber_get_stringa( ber, &cdn )) != LBER_ERROR )
+				tag = ber_peek_tag( ber, &len );
+		}
+		if( tag != LDAP_REQ_ABANDON && tag != LDAP_REQ_SEARCH ) {
+			Debug( LDAP_DEBUG_ANY, "invalid req for UDP 0x%lx\n", tag, 0, 0 );
+			ber_free( ber, 1 );
+			return 0;
+		}
+	}
+#endif
+
+	if(tag == LDAP_REQ_BIND) {
+		/* immediately abandon all existing operations upon BIND */
+		connection_abandon( conn );
+	}
+
+	ctx = cri->ctx;
+	op = slap_op_alloc( ber, msgid, tag, conn->c_n_ops_received++, ctx );
+
+	Debug( LDAP_DEBUG_TRACE, "op tag 0x%lx, time %ld\n", tag,
+		(long) op->o_time, 0);
+
+	op->o_conn = conn;
+	/* clear state if the connection is being reused from inactive */
+	if ( conn->c_conn_state == SLAP_C_INACTIVE ) {
+		memset( &conn->c_pagedresults_state, 0,
+			sizeof( conn->c_pagedresults_state ) );
+	}
+
+	op->o_res_ber = NULL;
+
+#ifdef LDAP_CONNECTIONLESS
+	if (conn->c_is_udp) {
+		if ( cdn ) {
+			ber_str2bv( cdn, 0, 1, &op->o_dn );
+			op->o_protocol = LDAP_VERSION2;
+		}
+		op->o_res_ber = ber_alloc_t( LBER_USE_DER );
+		if (op->o_res_ber == NULL) return 1;
+
+		rc = ber_write( op->o_res_ber, (char *)&peeraddr,
+			sizeof(struct sockaddr), 0 );
+
+		if (rc != sizeof(struct sockaddr)) {
+			Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
+			return 1;
+		}
+
+		if (op->o_protocol == LDAP_VERSION2) {
+			rc = ber_printf(op->o_res_ber, "{is{" /*}}*/, op->o_msgid, "");
+			if (rc == -1) {
+				Debug( LDAP_DEBUG_ANY, "ber_write failed\n", 0, 0, 0 );
+				return rc;
+			}
+		}
+	}
+#endif /* LDAP_CONNECTIONLESS */
+
+	rc = 0;
+
+	/* Don't process requests when the conn is in the middle of a
+	 * Bind, or if it's closing. Also, don't let any single conn
+	 * use up all the available threads, and don't execute if we're
+	 * currently blocked on output. And don't execute if there are
+	 * already pending ops, let them go first.  Abandon operations
+	 * get exceptions to some, but not all, cases.
+	 */
+	switch( tag ){
+	default:
+		/* Abandon and Unbind are exempt from these checks */
+		if (conn->c_conn_state == SLAP_C_CLOSING) {
+			defer = "closing";
+			break;
+		} else if (conn->c_writewaiter) {
+			defer = "awaiting write";
+			break;
+		} else if (conn->c_n_ops_pending) {
+			defer = "pending operations";
+			break;
+		}
+		/* FALLTHRU */
+	case LDAP_REQ_ABANDON:
+		/* Unbind is exempt from these checks */
+		if (conn->c_n_ops_executing >= connection_pool_max/2) {
+			defer = "too many executing";
+			break;
+		} else if (conn->c_conn_state == SLAP_C_BINDING) {
+			defer = "binding";
+			break;
+		}
+		/* FALLTHRU */
+	case LDAP_REQ_UNBIND:
+		break;
+	}
+
+	if( defer ) {
+		int max = conn->c_dn.bv_len
+			? slap_conn_max_pending_auth
+			: slap_conn_max_pending;
+
+		Debug( LDAP_DEBUG_ANY,
+			"connection_input: conn=%lu deferring operation: %s\n",
+			conn->c_connid, defer, 0 );
+		conn->c_n_ops_pending++;
+		LDAP_STAILQ_INSERT_TAIL( &conn->c_pending_ops, op, o_next );
+		rc = ( conn->c_n_ops_pending > max ) ? -1 : 0;
+
+	} else {
+		conn->c_n_ops_executing++;
+
+		/*
+		 * The first op will be processed in the same thread context,
+		 * as long as there is only one op total.
+		 * Subsequent ops will be submitted to the pool by
+		 * calling connection_op_activate()
+		 */
+		if ( cri->op == NULL ) {
+			/* the first incoming request */
+			connection_op_queue( op );
+			cri->op = op;
+		} else {
+			if ( !cri->nullop ) {
+				cri->nullop = 1;
+				rc = ldap_pvt_thread_pool_submit( &connection_pool,
+					connection_operation, (void *) cri->op );
+			}
+			connection_op_activate( op );
+		}
+	}
+
+#ifdef NO_THREADS
+	if ( conn->c_struct_state != SLAP_C_USED ) {
+		/* connection must have got closed underneath us */
+		return 1;
+	}
+#endif
+
+	assert( conn->c_struct_state == SLAP_C_USED );
+	return rc;
+}
+
+static int
+connection_resched( Connection *conn )
+{
+	Operation *op;
+
+	if( conn->c_writewaiter )
+		return 0;
+
+	if( conn->c_conn_state == SLAP_C_CLOSING ) {
+		Debug( LDAP_DEBUG_CONNS, "connection_resched: "
+			"attempting closing conn=%lu sd=%d\n",
+			conn->c_connid, conn->c_sd, 0 );
+		connection_close( conn );
+		return 0;
+	}
+
+	if( conn->c_conn_state != SLAP_C_ACTIVE ) {
+		/* other states need different handling */
+		return 0;
+	}
+
+	while ((op = LDAP_STAILQ_FIRST( &conn->c_pending_ops )) != NULL) {
+		if ( conn->c_n_ops_executing > connection_pool_max/2 ) break;
+
+		LDAP_STAILQ_REMOVE_HEAD( &conn->c_pending_ops, o_next );
+		LDAP_STAILQ_NEXT(op, o_next) = NULL;
+
+		/* pending operations should not be marked for abandonment */
+		assert(!op->o_abandon);
+
+		conn->c_n_ops_pending--;
+		conn->c_n_ops_executing++;
+
+		connection_op_activate( op );
+
+		if ( conn->c_conn_state == SLAP_C_BINDING ) break;
+	}
+	return 0;
+}
+
+static void
+connection_init_log_prefix( Operation *op )
+{
+	if ( op->o_connid == (unsigned long)(-1) ) {
+		snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
+			"conn=-1 op=%lu", op->o_opid );
+
+	} else {
+		snprintf( op->o_log_prefix, sizeof( op->o_log_prefix ),
+			"conn=%lu op=%lu", op->o_connid, op->o_opid );
+	}
+}
+
+static int connection_bind_cleanup_cb( Operation *op, SlapReply *rs )
+{
+	op->o_conn->c_sasl_bindop = NULL;
+
+	ch_free( op->o_callback );
+	op->o_callback = NULL;
+
+	return SLAP_CB_CONTINUE;
+}
+
+static int connection_bind_cb( Operation *op, SlapReply *rs )
+{
+	ldap_pvt_thread_mutex_lock( &op->o_conn->c_mutex );
+	op->o_conn->c_sasl_bind_in_progress =
+		( rs->sr_err == LDAP_SASL_BIND_IN_PROGRESS );
+
+	/* Moved here from bind.c due to ITS#4158 */
+	op->o_conn->c_sasl_bindop = NULL;
+	if ( op->orb_method == LDAP_AUTH_SASL ) {
+		if( rs->sr_err == LDAP_SUCCESS ) {
+			ber_dupbv(&op->o_conn->c_dn, &op->orb_edn);
+			if( !BER_BVISEMPTY( &op->orb_edn ) ) {
+				/* edn is always normalized already */
+				ber_dupbv( &op->o_conn->c_ndn, &op->o_conn->c_dn );
+			}
+			op->o_tmpfree( op->orb_edn.bv_val, op->o_tmpmemctx );
+			BER_BVZERO( &op->orb_edn );
+			op->o_conn->c_authmech = op->o_conn->c_sasl_bind_mech;
+			BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
+
+			op->o_conn->c_sasl_ssf = op->orb_ssf;
+			if( op->orb_ssf > op->o_conn->c_ssf ) {
+				op->o_conn->c_ssf = op->orb_ssf;
+			}
+
+			if( !BER_BVISEMPTY( &op->o_conn->c_dn ) ) {
+				ber_len_t max = sockbuf_max_incoming_auth;
+				ber_sockbuf_ctrl( op->o_conn->c_sb,
+					LBER_SB_OPT_SET_MAX_INCOMING, &max );
+			}
+
+			/* log authorization identity */
+			Statslog( LDAP_DEBUG_STATS,
+				"%s BIND dn=\"%s\" mech=%s sasl_ssf=%d ssf=%d\n",
+				op->o_log_prefix,
+				BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
+				op->o_conn->c_authmech.bv_val,
+				op->orb_ssf, op->o_conn->c_ssf );
+
+			Debug( LDAP_DEBUG_TRACE,
+				"do_bind: SASL/%s bind: dn=\"%s\" sasl_ssf=%d\n",
+				op->o_conn->c_authmech.bv_val,
+				BER_BVISNULL( &op->o_conn->c_dn ) ? "<empty>" : op->o_conn->c_dn.bv_val,
+				op->orb_ssf );
+
+		} else if ( rs->sr_err != LDAP_SASL_BIND_IN_PROGRESS ) {
+			if ( !BER_BVISNULL( &op->o_conn->c_sasl_bind_mech ) ) {
+				free( op->o_conn->c_sasl_bind_mech.bv_val );
+				BER_BVZERO( &op->o_conn->c_sasl_bind_mech );
+			}
+		}
+	}
+	ldap_pvt_thread_mutex_unlock( &op->o_conn->c_mutex );
+
+	ch_free( op->o_callback );
+	op->o_callback = NULL;
+
+	return SLAP_CB_CONTINUE;
+}
+
+static void connection_op_queue( Operation *op )
+{
+	ber_tag_t tag = op->o_tag;
+
+	if (tag == LDAP_REQ_BIND) {
+		slap_callback *sc = ch_calloc( 1, sizeof( slap_callback ));
+		sc->sc_response = connection_bind_cb;
+		sc->sc_cleanup = connection_bind_cleanup_cb;
+		sc->sc_next = op->o_callback;
+		op->o_callback = sc;
+		op->o_conn->c_conn_state = SLAP_C_BINDING;
+	}
+
+	if (!op->o_dn.bv_len) {
+		op->o_authz = op->o_conn->c_authz;
+		if ( BER_BVISNULL( &op->o_conn->c_sasl_authz_dn )) {
+			ber_dupbv( &op->o_dn, &op->o_conn->c_dn );
+			ber_dupbv( &op->o_ndn, &op->o_conn->c_ndn );
+		} else {
+			ber_dupbv( &op->o_dn, &op->o_conn->c_sasl_authz_dn );
+			ber_dupbv( &op->o_ndn, &op->o_conn->c_sasl_authz_dn );
+		}
+	}
+
+	op->o_authtype = op->o_conn->c_authtype;
+	ber_dupbv( &op->o_authmech, &op->o_conn->c_authmech );
+	
+	if (!op->o_protocol) {
+		op->o_protocol = op->o_conn->c_protocol
+			? op->o_conn->c_protocol : LDAP_VERSION3;
+	}
+
+	if (op->o_conn->c_conn_state == SLAP_C_INACTIVE &&
+		op->o_protocol > LDAP_VERSION2)
+	{
+		op->o_conn->c_conn_state = SLAP_C_ACTIVE;
+	}
+
+	op->o_connid = op->o_conn->c_connid;
+	connection_init_log_prefix( op );
+
+	LDAP_STAILQ_INSERT_TAIL( &op->o_conn->c_ops, op, o_next );
+}
+
+static int connection_op_activate( Operation *op )
+{
+	int rc;
+
+	connection_op_queue( op );
+
+	rc = ldap_pvt_thread_pool_submit( &connection_pool,
+		connection_operation, (void *) op );
+
+	if ( rc != 0 ) {
+		Debug( LDAP_DEBUG_ANY,
+			"connection_op_activate: submit failed (%d) for conn=%lu\n",
+			rc, op->o_connid, 0 );
+		/* should move op to pending list */
+	}
+
+	return rc;
+}
+
+int connection_write(ber_socket_t s)
+{
+	Connection *c;
+	Operation *op;
+
+	assert( connections != NULL );
+
+	c = connection_get( s );
+	if( c == NULL ) {
+		Debug( LDAP_DEBUG_ANY,
+			"connection_write(%ld): no connection!\n",
+			(long)s, 0, 0 );
+		return -1;
+	}
+
+	slapd_clr_write( s, 0 );
+
+#ifdef HAVE_TLS
+	if ( c->c_is_tls && c->c_needs_tls_accept ) {
+		connection_return( c );
+		connection_read_activate( s );
+		return 0;
+	}
+#endif
+
+	c->c_n_write++;
+
+	Debug( LDAP_DEBUG_TRACE,
+		"connection_write(%d): waking output for id=%lu\n",
+		s, c->c_connid, 0 );
+	ldap_pvt_thread_mutex_lock( &c->c_write2_mutex );
+	ldap_pvt_thread_cond_signal( &c->c_write2_cv );
+	ldap_pvt_thread_mutex_unlock( &c->c_write2_mutex );
+
+	if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_READ, NULL ) ) {
+		slapd_set_read( s, 1 );
+	}
+	if ( ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_NEEDS_WRITE, NULL ) ) {
+		slapd_set_write( s, 1 );
+	}
+
+	/* If there are ops pending because of a writewaiter,
+	 * start one up.
+	 */
+	while ((op = LDAP_STAILQ_FIRST( &c->c_pending_ops )) != NULL) {
+		if ( !c->c_writewaiter ) break;
+		if ( c->c_n_ops_executing > connection_pool_max/2 ) break;
+
+		LDAP_STAILQ_REMOVE_HEAD( &c->c_pending_ops, o_next );
+		LDAP_STAILQ_NEXT(op, o_next) = NULL;
+
+		/* pending operations should not be marked for abandonment */
+		assert(!op->o_abandon);
+
+		c->c_n_ops_pending--;
+		c->c_n_ops_executing++;
+
+		connection_op_activate( op );
+
+		break;
+	}
+
+	connection_return( c );
+	return 0;
+}
+
+#ifdef LDAP_SLAPI
+typedef struct conn_fake_extblock {
+	void *eb_conn;
+	void *eb_op;
+} conn_fake_extblock;
+
+static void
+connection_fake_destroy(
+	void *key,
+	void *data )
+{
+	Connection conn = {0};
+	Operation op = {0};
+	Opheader ohdr = {0};
+
+	conn_fake_extblock *eb = data;
+	
+	op.o_hdr = &ohdr;
+	op.o_hdr->oh_extensions = eb->eb_op;
+	conn.c_extensions = eb->eb_conn;
+	op.o_conn = &conn;
+	conn.c_connid = -1;
+	op.o_connid = -1;
+
+	ber_memfree_x( eb, NULL );
+	slapi_int_free_object_extensions( SLAPI_X_EXT_OPERATION, &op );
+	slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION, &conn );
+}
+#endif
+
+void
+connection_fake_init(
+	Connection *conn,
+	OperationBuffer *opbuf,
+	void *ctx )
+{
+	connection_fake_init2( conn, opbuf, ctx, 1 );
+}
+
+void
+operation_fake_init(
+	Connection *conn,
+	Operation *op,
+	void *ctx,
+	int newmem )
+{
+	/* set memory context */
+	op->o_tmpmemctx = slap_sl_mem_create(SLAP_SLAB_SIZE, SLAP_SLAB_STACK, ctx,
+		newmem );
+	op->o_tmpmfuncs = &slap_sl_mfuncs;
+	op->o_threadctx = ctx;
+	op->o_tid = ldap_pvt_thread_pool_tid( ctx );
+
+	op->o_counters = &slap_counters;
+	op->o_conn = conn;
+	op->o_connid = op->o_conn->c_connid;
+	connection_init_log_prefix( op );
+}
+
+
+void
+connection_fake_init2(
+	Connection *conn,
+	OperationBuffer *opbuf,
+	void *ctx,
+	int newmem )
+{
+	Operation *op = (Operation *) opbuf;
+
+	conn->c_connid = -1;
+	conn->c_conn_idx = -1;
+	conn->c_send_ldap_result = slap_send_ldap_result;
+	conn->c_send_search_entry = slap_send_search_entry;
+	conn->c_send_search_reference = slap_send_search_reference;
+	conn->c_send_ldap_extended = slap_send_ldap_extended;
+	conn->c_send_ldap_intermediate = slap_send_ldap_intermediate;
+	conn->c_listener = (Listener *)&dummy_list;
+	conn->c_peer_domain = slap_empty_bv;
+	conn->c_peer_name = slap_empty_bv;
+
+	memset( opbuf, 0, sizeof( *opbuf ));
+	op->o_hdr = &opbuf->ob_hdr;
+	op->o_controls = opbuf->ob_controls;
+
+	operation_fake_init( conn, op, ctx, newmem );
+
+#ifdef LDAP_SLAPI
+	if ( slapi_plugins_used ) {
+		conn_fake_extblock *eb;
+		void *ebx = NULL;
+
+		/* Use thread keys to make sure these eventually get cleaned up */
+		if ( ldap_pvt_thread_pool_getkey( ctx, (void *)connection_fake_init,
+				&ebx, NULL )) {
+			eb = ch_malloc( sizeof( *eb ));
+			slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, conn );
+			slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
+			eb->eb_conn = conn->c_extensions;
+			eb->eb_op = op->o_hdr->oh_extensions;
+			ldap_pvt_thread_pool_setkey( ctx, (void *)connection_fake_init,
+				eb, connection_fake_destroy, NULL, NULL );
+		} else {
+			eb = ebx;
+			conn->c_extensions = eb->eb_conn;
+			op->o_hdr->oh_extensions = eb->eb_op;
+		}
+	}
+#endif /* LDAP_SLAPI */
+
+	slap_op_time( &op->o_time, &op->o_tincr );
+}
+
+void
+connection_assign_nextid( Connection *conn )
+{
+	ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
+	conn->c_connid = conn_nextid++;
+	ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
+}