connection.c 50.4 KB
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/* $OpenLDAP$ */
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/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
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 * Copyright 1998-2009 The OpenLDAP Foundation.
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 * 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.
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 */

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#include "portable.h"
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#include <stdio.h>
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#ifdef HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#include <ac/socket.h>
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#include <ac/errno.h>
#include <ac/string.h>
#include <ac/time.h>
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#include <ac/unistd.h>
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#include "lutil.h"
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#include "slap.h"

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#ifdef LDAP_SLAPI
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#include "slapi/slapi.h"
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#endif

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/* protected by connections_mutex */
static ldap_pvt_thread_mutex_t connections_mutex;
static Connection *connections = NULL;
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static ldap_pvt_thread_mutex_t conn_nextid_mutex;
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static unsigned long conn_nextid = 0;
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static const char conn_lost_str[] = "connection lost";

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const char *
connection_state2str( int state )
{
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	switch( state ) {
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	case SLAP_C_INVALID:	return "!";
	case SLAP_C_INACTIVE:	return "|";
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	case SLAP_C_CLOSING:	return "C";
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	case SLAP_C_ACTIVE:		return "";
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	case SLAP_C_BINDING:	return "B";
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	case SLAP_C_CLIENT:		return "L";
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	}

	return "?";
}

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static Connection* connection_get( ber_socket_t s );
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typedef struct conn_readinfo {
	Operation *op;
	ldap_pvt_thread_start_t *func;
	void *arg;
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	void *ctx;
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	int nullop;
} conn_readinfo;

static int connection_input( Connection *c, conn_readinfo *cri );
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static void connection_close( Connection *c );
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static int connection_op_activate( Operation *op );
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static void connection_op_queue( Operation *op );
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static int connection_resched( Connection *conn );
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static void connection_abandon( Connection *conn );
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static void connection_destroy( Connection *c );
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static ldap_pvt_thread_start_t connection_operation;

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/*
 * Initialize connection management infrastructure.
 */
int connections_init(void)
{
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	int i;

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	assert( connections == NULL );

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	if( connections != NULL) {
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		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 );
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	ldap_pvt_thread_mutex_init( &conn_nextid_mutex );
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	connections = (Connection *) ch_calloc( dtblsize, sizeof(Connection) );
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	if( connections == NULL ) {
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		Debug( LDAP_DEBUG_ANY, "connections_init: "
			"allocation (%d*%ld) of connection array failed\n",
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			dtblsize, (long) sizeof(Connection), 0 );
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		return -1;
	}

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	assert( connections[0].c_struct_state == SLAP_C_UNINITIALIZED );
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	assert( connections[dtblsize-1].c_struct_state == SLAP_C_UNINITIALIZED );
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	for (i=0; i<dtblsize; i++) connections[i].c_conn_idx = i;
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	/*
	 * per entry initialization of the Connection array initialization
	 * will be done by connection_init()
	 */ 

	return 0;
}

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/*
 * Destroy connection management infrastructure.
 */
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int connections_destroy(void)
{
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	ber_socket_t i;
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	/* should check return of every call */

	if( connections == NULL) {
		Debug( LDAP_DEBUG_ANY, "connections_destroy: nothing to destroy.\n",
			0, 0, 0 );
		return -1;
	}

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	for ( i = 0; i < dtblsize; i++ ) {
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		if( connections[i].c_struct_state != SLAP_C_UNINITIALIZED ) {
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			ber_sockbuf_free( connections[i].c_sb );
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			ldap_pvt_thread_mutex_destroy( &connections[i].c_mutex );
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			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 );
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#ifdef LDAP_SLAPI
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			if ( slapi_plugins_used ) {
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				slapi_int_free_object_extensions( SLAPI_X_EXT_CONNECTION,
					&connections[i] );
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			}
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#endif
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		}
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	}

	free( connections );
	connections = NULL;

	ldap_pvt_thread_mutex_destroy( &connections_mutex );
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	ldap_pvt_thread_mutex_destroy( &conn_nextid_mutex );
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	return 0;
}

/*
 * shutdown all connections
 */
int connections_shutdown(void)
{
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	ber_socket_t i;
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	for ( i = 0; i < dtblsize; i++ ) {
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		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] );
				}
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			}
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			ldap_pvt_thread_mutex_unlock( &connections[i].c_mutex );
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		}
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	}

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	return 0;
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}

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/*
 * Timeout idle connections.
 */
int connections_timeout_idle(time_t now)
{
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	int i = 0, writers = 0;
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	int connindex;
	Connection* c;
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	time_t old;

	old = slapd_get_writetime();
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	for( c = connection_first( &connindex );
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		c != NULL;
		c = connection_next( c, &connindex ) )
	{
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		/* Don't timeout a slow-running request or a persistent
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		 * 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 ) {
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			continue;
		}
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		if( global_idletimeout && 
			difftime( c->c_activitytime+global_idletimeout, now) < 0 ) {
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			/* close it */
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			connection_closing( c, "idletimeout" );
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			connection_close( c );
			i++;
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			continue;
		}
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		if ( c->c_writewaiter && global_writetimeout ) {
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			writers = 1;
			if( difftime( c->c_activitytime+global_writetimeout, now) < 0 ) {
				/* close it */
				connection_closing( c, "writetimeout" );
				connection_close( c );
				i++;
			}
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		}
	}
	connection_done( c );
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	if ( old && !writers )
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		slapd_clr_writetime( old );
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	return i;
}

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static Connection* connection_get( ber_socket_t s )
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{
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	Connection *c;

	Debug( LDAP_DEBUG_ARGS,
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		"connection_get(%ld)\n",
		(long) s, 0, 0 );
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	assert( connections != NULL );

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	if(s == AC_SOCKET_INVALID) return NULL;
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	assert( s < dtblsize );
	c = &connections[s];
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	if( c != NULL ) {
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		ldap_pvt_thread_mutex_lock( &c->c_mutex );

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		assert( c->c_struct_state != SLAP_C_UNINITIALIZED );

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		if( c->c_struct_state != SLAP_C_USED ) {
			/* connection must have been closed due to resched */
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			assert( c->c_conn_state == SLAP_C_INVALID );
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			assert( c->c_sd == AC_SOCKET_INVALID );
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			Debug( LDAP_DEBUG_CONNS,
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				"connection_get(%d): connection not used\n",
				s, 0, 0 );
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			ldap_pvt_thread_mutex_unlock( &c->c_mutex );
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			return NULL;
		}

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		Debug( LDAP_DEBUG_TRACE,
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			"connection_get(%d): got connid=%lu\n",
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			s, c->c_connid, 0 );
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		c->c_n_get++;

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		assert( c->c_struct_state == SLAP_C_USED );
		assert( c->c_conn_state != SLAP_C_INVALID );
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		assert( c->c_sd != AC_SOCKET_INVALID );
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#ifndef SLAPD_MONITOR
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		if ( global_idletimeout > 0 )
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#endif /* ! SLAPD_MONITOR */
		{
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			c->c_activitytime = slap_get_time();
		}
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	}
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	return c;
}

static void connection_return( Connection *c )
{
	ldap_pvt_thread_mutex_unlock( &c->c_mutex );
}

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Connection * connection_init(
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	ber_socket_t s,
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	Listener *listener,
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	const char* dnsname,
	const char* peername,
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	int flags,
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	slap_ssf_t ssf,
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	struct berval *authid
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	LDAP_PF_LOCAL_SENDMSG_ARG(struct berval *peerbv))
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{
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	unsigned long id;
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	Connection *c;
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	int doinit = 0;
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	ber_socket_t sfd = SLAP_FD2SOCK(s);
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	assert( connections != NULL );

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	assert( listener != NULL );
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	assert( dnsname != NULL );
	assert( peername != NULL );

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#ifndef HAVE_TLS
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	assert( !( flags & CONN_IS_TLS ));
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#endif

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	if( s == AC_SOCKET_INVALID ) {
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		Debug( LDAP_DEBUG_ANY,
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			"connection_init: init of socket %ld invalid.\n", (long)s, 0, 0 );
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		return NULL;
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	}

	assert( s >= 0 );
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	assert( s < dtblsize );
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	c = &connections[s];
	if( c->c_struct_state == SLAP_C_UNINITIALIZED ) {
		doinit = 1;
	} else {
		assert( c->c_struct_state == SLAP_C_UNUSED );
	}
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	if( doinit ) {
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		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;
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		c->c_send_ldap_intermediate = slap_send_ldap_intermediate;
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		BER_BVZERO( &c->c_authmech );
		BER_BVZERO( &c->c_dn );
		BER_BVZERO( &c->c_ndn );
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		c->c_listener = NULL;
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		BER_BVZERO( &c->c_peer_domain );
		BER_BVZERO( &c->c_peer_name );
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		LDAP_STAILQ_INIT(&c->c_ops);
		LDAP_STAILQ_INIT(&c->c_pending_ops);
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#ifdef LDAP_X_TXN
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		c->c_txn = CONN_TXN_INACTIVE;
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		c->c_txn_backend = NULL;
		LDAP_STAILQ_INIT(&c->c_txn_ops);
#endif

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		BER_BVZERO( &c->c_sasl_bind_mech );
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		c->c_sasl_done = 0;
		c->c_sasl_authctx = NULL;
		c->c_sasl_sockctx = NULL;
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		c->c_sasl_extra = NULL;
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		c->c_sasl_bindop = NULL;
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		c->c_sb = ber_sockbuf_alloc( );

		{
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			ber_len_t max = sockbuf_max_incoming;
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			ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
		}

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		c->c_currentber = NULL;
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		/* should check status of thread calls */
		ldap_pvt_thread_mutex_init( &c->c_mutex );
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		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 );
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#ifdef LDAP_SLAPI
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		if ( slapi_plugins_used ) {
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			slapi_int_create_object_extensions( SLAPI_X_EXT_CONNECTION, c );
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		}
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#endif
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	}
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	ldap_pvt_thread_mutex_lock( &c->c_mutex );
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	assert( BER_BVISNULL( &c->c_authmech ) );
	assert( BER_BVISNULL( &c->c_dn ) );
	assert( BER_BVISNULL( &c->c_ndn ) );
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	assert( c->c_listener == NULL );
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	assert( BER_BVISNULL( &c->c_peer_domain ) );
	assert( BER_BVISNULL( &c->c_peer_name ) );
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	assert( LDAP_STAILQ_EMPTY(&c->c_ops) );
	assert( LDAP_STAILQ_EMPTY(&c->c_pending_ops) );
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#ifdef LDAP_X_TXN
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	assert( c->c_txn == CONN_TXN_INACTIVE );
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	assert( c->c_txn_backend == NULL );
	assert( LDAP_STAILQ_EMPTY(&c->c_txn_ops) );
#endif
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	assert( BER_BVISNULL( &c->c_sasl_bind_mech ) );
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	assert( c->c_sasl_done == 0 );
	assert( c->c_sasl_authctx == NULL );
	assert( c->c_sasl_sockctx == NULL );
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	assert( c->c_sasl_extra == NULL );
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	assert( c->c_sasl_bindop == NULL );
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	assert( c->c_currentber == NULL );
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	assert( c->c_writewaiter == 0);
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	assert( c->c_writers == 0);
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	c->c_listener = listener;
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	c->c_sd = s;
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	if ( flags & CONN_IS_CLIENT ) {
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		c->c_connid = 0;
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		ldap_pvt_thread_mutex_lock( &connections_mutex );
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		c->c_conn_state = SLAP_C_CLIENT;
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		c->c_struct_state = SLAP_C_USED;
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		ldap_pvt_thread_mutex_unlock( &connections_mutex );
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		c->c_close_reason = "?";			/* should never be needed */
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		ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_FD, &sfd );
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		ldap_pvt_thread_mutex_unlock( &c->c_mutex );

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		return c;
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	}

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	ber_str2bv( dnsname, 0, 1, &c->c_peer_domain );
	ber_str2bv( peername, 0, 1, &c->c_peer_name );
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	c->c_n_ops_received = 0;
	c->c_n_ops_executing = 0;
	c->c_n_ops_pending = 0;
	c->c_n_ops_completed = 0;
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	c->c_n_get = 0;
	c->c_n_read = 0;
	c->c_n_write = 0;
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	/* set to zero until bind, implies LDAP_VERSION3 */
	c->c_protocol = 0;
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#ifndef SLAPD_MONITOR
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	if ( global_idletimeout > 0 )
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#endif /* ! SLAPD_MONITOR */
	{
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		c->c_activitytime = c->c_starttime = slap_get_time();
	}
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#ifdef LDAP_CONNECTIONLESS
	c->c_is_udp = 0;
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	if( flags & CONN_IS_UDP ) {
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		c->c_is_udp = 1;
#ifdef LDAP_DEBUG
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		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
			LBER_SBIOD_LEVEL_PROVIDER, (void*)"udp_" );
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#endif
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		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_udp,
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			LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
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		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_readahead,
			LBER_SBIOD_LEVEL_PROVIDER, NULL );
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	} else
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#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_" );
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#endif
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		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_fd,
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			LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
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#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 */
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	{
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#ifdef LDAP_DEBUG
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		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
			LBER_SBIOD_LEVEL_PROVIDER, (void*)"tcp_" );
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#endif
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		ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_tcp,
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			LBER_SBIOD_LEVEL_PROVIDER, (void *)&sfd );
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	}
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#ifdef LDAP_DEBUG
	ber_sockbuf_add_io( c->c_sb, &ber_sockbuf_io_debug,
		INT_MAX, (void*)"ldap_" );
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#endif
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	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",
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			s, c->c_peer_name.bv_val, 0 );
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	}
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	ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
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	id = c->c_connid = conn_nextid++;
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	ldap_pvt_thread_mutex_unlock( &conn_nextid_mutex );
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	ldap_pvt_thread_mutex_lock( &connections_mutex );
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	c->c_conn_state = SLAP_C_INACTIVE;
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	c->c_struct_state = SLAP_C_USED;
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	ldap_pvt_thread_mutex_unlock( &connections_mutex );
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	c->c_close_reason = "?";			/* should never be needed */
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	c->c_ssf = c->c_transport_ssf = ssf;
	c->c_tls_ssf = 0;

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#ifdef HAVE_TLS
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	if ( flags & CONN_IS_TLS ) {
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		c->c_is_tls = 1;
		c->c_needs_tls_accept = 1;
	} else {
		c->c_is_tls = 0;
		c->c_needs_tls_accept = 0;
	}
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#endif
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	slap_sasl_open( c, 0 );
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	slap_sasl_external( c, ssf, authid );
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	slapd_add_internal( s, 1 );
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	ldap_pvt_thread_mutex_unlock( &c->c_mutex );
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	backend_connection_init(c);
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	return c;
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}

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void connection2anonymous( Connection *c )
{
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	assert( connections != NULL );
	assert( c != NULL );
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	{
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		ber_len_t max = sockbuf_max_incoming;
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		ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
	}

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	if ( !BER_BVISNULL( &c->c_authmech ) ) {
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		ch_free(c->c_authmech.bv_val);
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	}
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	BER_BVZERO( &c->c_authmech );
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	if ( !BER_BVISNULL( &c->c_dn ) ) {
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		ch_free(c->c_dn.bv_val);
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	}
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	BER_BVZERO( &c->c_dn );
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	if ( !BER_BVISNULL( &c->c_ndn ) ) {
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		ch_free(c->c_ndn.bv_val);
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	}
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	BER_BVZERO( &c->c_ndn );
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	if ( !BER_BVISNULL( &c->c_sasl_authz_dn ) ) {
		ber_memfree_x( c->c_sasl_authz_dn.bv_val, NULL );
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	}
	BER_BVZERO( &c->c_sasl_authz_dn );
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	c->c_authz_backend = NULL;
}

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static void
connection_destroy( Connection *c )
{
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	unsigned long	connid;
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	const char		*close_reason;
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	Sockbuf			*sb;
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	ber_socket_t	sd;
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	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) );
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	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
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	assert( c->c_writewaiter == 0);
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	assert( c->c_writers == 0);
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	/* only for stats (print -1 as "%lu" may give unexpected results ;) */
	connid = c->c_connid;
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	close_reason = c->c_close_reason;
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	ldap_pvt_thread_mutex_lock( &connections_mutex );
	c->c_struct_state = SLAP_C_PENDING;
	ldap_pvt_thread_mutex_unlock( &connections_mutex );

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	backend_connection_destroy(c);
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	c->c_protocol = 0;
	c->c_connid = -1;
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	c->c_activitytime = c->c_starttime = 0;
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	connection2anonymous( c );
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	c->c_listener = NULL;
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	if(c->c_peer_domain.bv_val != NULL) {
		free(c->c_peer_domain.bv_val);
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	}
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	BER_BVZERO( &c->c_peer_domain );
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	if(c->c_peer_name.bv_val != NULL) {
		free(c->c_peer_name.bv_val);
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	}
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	BER_BVZERO( &c->c_peer_name );
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	c->c_sasl_bind_in_progress = 0;
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	if(c->c_sasl_bind_mech.bv_val != NULL) {
		free(c->c_sasl_bind_mech.bv_val);
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	}
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	BER_BVZERO( &c->c_sasl_bind_mech );
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	slap_sasl_close( c );
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	if ( c->c_currentber != NULL ) {
		ber_free( c->c_currentber, 1 );
		c->c_currentber = NULL;
	}

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#ifdef LDAP_SLAPI
	/* call destructors, then constructors; avoids unnecessary allocation */
	if ( slapi_plugins_used ) {
		slapi_int_clear_object_extensions( SLAPI_X_EXT_CONNECTION, c );
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	}
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#endif
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	sd = c->c_sd;
	c->c_sd = AC_SOCKET_INVALID;
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	c->c_conn_state = SLAP_C_INVALID;
	c->c_struct_state = SLAP_C_UNUSED;
	c->c_close_reason = "?";			/* should never be needed */
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	sb = c->c_sb;
	c->c_sb = ber_sockbuf_alloc( );
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	{
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		ber_len_t max = sockbuf_max_incoming;
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		ber_sockbuf_ctrl( c->c_sb, LBER_SB_OPT_SET_MAX_INCOMING, &max );
	}

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	/* c must be fully reset by this point; when we call slapd_remove
	 * it may get immediately reused by a new connection.
	 */
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	if ( sd != AC_SOCKET_INVALID ) {
		slapd_remove( sd, sb, 1, 0, 0 );
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		if ( close_reason == NULL ) {
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			Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed\n",
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				connid, (long) sd, 0, 0, 0 );
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		} else {
			Statslog( LDAP_DEBUG_STATS, "conn=%lu fd=%ld closed (%s)\n",
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				connid, (long) sd, close_reason, 0, 0 );
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		}
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	}
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}

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int connection_valid( Connection *c )
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{
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	/* c_mutex must be locked by caller */

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	assert( c != NULL );
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	return c->c_struct_state == SLAP_C_USED &&
		c->c_conn_state >= SLAP_C_ACTIVE &&
		c->c_conn_state <= SLAP_C_CLIENT;
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}

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static void connection_abandon( Connection *c )
{
	/* c_mutex must be locked by caller */

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	Operation *o, *next, op = {0};
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	Opheader ohdr = {0};
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	SlapReply rs = {0};
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	op.o_hdr = &ohdr;
	op.o_conn = c;
	op.o_connid = c->c_connid;
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	op.o_tag = LDAP_REQ_ABANDON;
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	for ( o = LDAP_STAILQ_FIRST( &c->c_ops ); o; o=next ) {
		next = LDAP_STAILQ_NEXT( o, o_next );
		op.orn_msgid = o->o_msgid;
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		o->o_abandon = 1;
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		op.o_bd = frontendDB;
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		frontendDB->be_abandon( &op, &rs );
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	}

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#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;
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		slap_op_free( o, NULL );
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	}

	/* clear transaction */
	c->c_txn_backend = NULL;
	c->c_txn = CONN_TXN_INACTIVE;
#endif

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	/* remove pending operations */
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	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;
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		slap_op_free( o, NULL );
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	}
}

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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 );
	}
}

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void connection_closing( Connection *c, const char *why )
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{
	assert( connections != NULL );
	assert( c != NULL );
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	if ( c->c_struct_state != SLAP_C_USED ) return;

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	assert( c->c_conn_state != SLAP_C_INVALID );

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	/* c_mutex must be locked by caller */

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	if( c->c_conn_state != SLAP_C_CLOSING ) {
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		Debug( LDAP_DEBUG_CONNS,
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			"connection_closing: readying conn=%lu sd=%d for close\n",
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			c->c_connid, c->c_sd, 0 );
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		/* update state to closing */
		c->c_conn_state = SLAP_C_CLOSING;
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		c->c_close_reason = why;
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		/* don't listen on this port anymore */
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		slapd_clr_read( c->c_sd, 0 );
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		/* abandon active operations */
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		connection_abandon( c );
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		/* wake write blocked operations */
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		connection_wake_writers( c );
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	} else if( why == NULL && c->c_close_reason == conn_lost_str ) {
		/* Client closed connection after doing Unbind. */
		c->c_close_reason = NULL;
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	}
}

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static void
connection_close( Connection *c )
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{
	assert( connections != NULL );
	assert( c != NULL );
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	if ( c->c_struct_state != SLAP_C_USED ) return;

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	assert( c->c_conn_state == SLAP_C_CLOSING );
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	/* NOTE: c_mutex should be locked by caller */
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	if ( !LDAP_STAILQ_EMPTY(&c->c_ops) ||
		!LDAP_STAILQ_EMPTY(&c->c_pending_ops) )
	{
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		Debug( LDAP_DEBUG_CONNS,
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			"connection_close: deferring conn=%lu sd=%d\n",
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			c->c_connid, c->c_sd, 0 );
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		return;
	}

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	Debug( LDAP_DEBUG_TRACE, "connection_close: conn=%lu sd=%d\n",
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		c->c_connid, c->c_sd, 0 );
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	connection_destroy( c );
}

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unsigned long connections_nextid(void)
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{
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	unsigned long id;
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	assert( connections != NULL );

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	ldap_pvt_thread_mutex_lock( &conn_nextid_mutex );
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	id = conn_nextid;