/* operation.c - routines to deal with pending ldap operations */
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2022 The OpenLDAP Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */
/* 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>

#include <ac/string.h>
#include <ac/socket.h>

#include "slap.h"

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

static ldap_pvt_thread_mutex_t	slap_op_mutex;
static time_t last_time;
static int last_incr;

void slap_op_init(void)
{
	struct timeval tv;
	ldap_pvt_thread_mutex_init( &slap_op_mutex );
	gettimeofday( &tv, NULL );
	last_time = tv.tv_sec;
	last_incr = tv.tv_usec;
}

void slap_op_destroy(void)
{
	ldap_pvt_thread_mutex_destroy( &slap_op_mutex );
}

static void
slap_op_q_destroy( void *key, void *data )
{
	Operation *op, *op2;
	for ( op = data; op; op = op2 ) {
		op2 = LDAP_STAILQ_NEXT( op, o_next );
		ber_memfree_x( op, NULL );
	}
}

void
slap_op_groups_free( Operation *op )
{
	GroupAssertion *g, *n;
	for ( g = op->o_groups; g; g = n ) {
		n = g->ga_next;
		slap_sl_free( g, op->o_tmpmemctx );
	}
	op->o_groups = NULL;
}

void
slap_op_free( Operation *op, void *ctx )
{
	OperationBuffer *opbuf;

	assert( LDAP_STAILQ_NEXT(op, o_next) == NULL );

	/* paranoia */
	op->o_abandon = 1;

	if ( op->o_ber != NULL ) {
		ber_free( op->o_ber, 1 );
	}
	if ( !BER_BVISNULL( &op->o_dn ) ) {
		ch_free( op->o_dn.bv_val );
	}
	if ( !BER_BVISNULL( &op->o_ndn ) ) {
		ch_free( op->o_ndn.bv_val );
	}
	if ( !BER_BVISNULL( &op->o_authmech ) ) {
		ch_free( op->o_authmech.bv_val );
	}
	if ( op->o_ctrls != NULL ) {
		slap_free_ctrls( op, op->o_ctrls );
	}

#ifdef LDAP_CONNECTIONLESS
	if ( op->o_res_ber != NULL ) {
		ber_free( op->o_res_ber, 1 );
	}
#endif

	if ( op->o_groups ) {
		slap_op_groups_free( op );
	}

#if defined( LDAP_SLAPI )
	if ( slapi_plugins_used ) {
		slapi_int_free_object_extensions( SLAPI_X_EXT_OPERATION, op );
	}
#endif /* defined( LDAP_SLAPI ) */

	if ( !BER_BVISNULL( &op->o_csn ) ) {
		op->o_tmpfree( op->o_csn.bv_val, op->o_tmpmemctx );
	}

	if ( op->o_pagedresults_state != NULL ) {
		op->o_tmpfree( op->o_pagedresults_state, op->o_tmpmemctx );
	}

	/* Selectively zero out the struct. Ignore fields that will
	 * get explicitly initialized later anyway. Keep o_abandon intact.
	 */
	opbuf = (OperationBuffer *) op;
	op->o_bd = NULL;
	BER_BVZERO( &op->o_req_dn );
	BER_BVZERO( &op->o_req_ndn );
	memset( op->o_hdr, 0, sizeof( *op->o_hdr ));
	memset( &op->o_request, 0, sizeof( op->o_request ));
	memset( &op->o_do_not_cache, 0, sizeof( Operation ) - offsetof( Operation, o_do_not_cache ));
	memset( opbuf->ob_controls, 0, sizeof( opbuf->ob_controls ));
	op->o_controls = opbuf->ob_controls;

	if ( ctx ) {
		Operation *op2 = NULL;
		ldap_pvt_thread_pool_setkey( ctx, (void *)slap_op_free,
			op, slap_op_q_destroy, (void **)&op2, NULL );
		LDAP_STAILQ_NEXT( op, o_next ) = op2;
		if ( op2 ) {
			op->o_tincr = op2->o_tincr + 1;
			/* No more than 10 ops on per-thread free list */
			if ( op->o_tincr > 10 ) {
				ldap_pvt_thread_pool_setkey( ctx, (void *)slap_op_free,
					op2, slap_op_q_destroy, NULL, NULL );
				ber_memfree_x( op, NULL );
			}
		} else {
			op->o_tincr = 1;
		}
	} else {
		ber_memfree_x( op, NULL );
	}
}

void
slap_op_time(time_t *t, int *nop)
{
	struct timeval tv;
	ldap_pvt_thread_mutex_lock( &slap_op_mutex );
	gettimeofday( &tv, NULL );
	*t = tv.tv_sec;
	if ( *t == last_time ) {
		*nop = ++last_incr;
	} else {
		last_time = *t;
		last_incr = 0;
		*nop = 0;
	}
	ldap_pvt_thread_mutex_unlock( &slap_op_mutex );
	nop[1] = tv.tv_usec;
}

Operation *
slap_op_alloc(
    BerElement		*ber,
    ber_int_t	msgid,
    ber_tag_t	tag,
    ber_int_t	id,
	void *ctx )
{
	Operation	*op = NULL;

	if ( ctx ) {
		void *otmp = NULL;
		ldap_pvt_thread_pool_getkey( ctx, (void *)slap_op_free, &otmp, NULL );
		if ( otmp ) {
			op = otmp;
			otmp = LDAP_STAILQ_NEXT( op, o_next );
			ldap_pvt_thread_pool_setkey( ctx, (void *)slap_op_free,
				otmp, slap_op_q_destroy, NULL, NULL );
			op->o_abandon = 0;
			op->o_cancel = 0;
		}
	}
	if (!op) {
		op = (Operation *) ch_calloc( 1, sizeof(OperationBuffer) );
		op->o_hdr = &((OperationBuffer *) op)->ob_hdr;
		op->o_controls = ((OperationBuffer *) op)->ob_controls;
	}

	op->o_ber = ber;
	op->o_msgid = msgid;
	op->o_tag = tag;

	slap_op_time( &op->o_time, &op->o_tincr );
	op->o_opid = id;

#if defined( LDAP_SLAPI )
	if ( slapi_plugins_used ) {
		slapi_int_create_object_extensions( SLAPI_X_EXT_OPERATION, op );
	}
#endif /* defined( LDAP_SLAPI ) */

	return( op );
}

slap_op_t
slap_req2op( ber_tag_t tag )
{
	switch ( tag ) {
	case LDAP_REQ_BIND:
		return SLAP_OP_BIND;
	case LDAP_REQ_UNBIND:
		return SLAP_OP_UNBIND;
	case LDAP_REQ_ADD:
		return SLAP_OP_ADD;
	case LDAP_REQ_DELETE:
		return SLAP_OP_DELETE;
	case LDAP_REQ_MODRDN:
		return SLAP_OP_MODRDN;
	case LDAP_REQ_MODIFY:
		return SLAP_OP_MODIFY;
	case LDAP_REQ_COMPARE:
		return SLAP_OP_COMPARE;
	case LDAP_REQ_SEARCH:
		return SLAP_OP_SEARCH;
	case LDAP_REQ_ABANDON:
		return SLAP_OP_ABANDON;
	case LDAP_REQ_EXTENDED:
		return SLAP_OP_EXTENDED;
	}

	return SLAP_OP_LAST;
}
