/* at.c - routines for dealing with attribute types */
/* $OpenLDAP: pkg/ldap/servers/slapd/at.c,v 1.57.2.2 2004/01/01 18:16:32 kurt Exp $ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
 *
 * Copyright 1998-2004 The OpenLDAP Foundation.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted only as authorized by the OpenLDAP
 * Public License.
 *
 * A copy of this license is available in the file LICENSE in the
 * top-level directory of the distribution or, alternatively, at
 * <http://www.OpenLDAP.org/license.html>.
 */

#include "portable.h"

#include <stdio.h>

#include <ac/ctype.h>
#include <ac/errno.h>
#include <ac/socket.h>
#include <ac/string.h>
#include <ac/time.h>

#include "ldap_pvt.h"
#include "slap.h"


int is_at_syntax(
	AttributeType *at,
	const char *oid )
{
	for( ; at != NULL; at = at->sat_sup ) {
		if( at->sat_syntax_oid ) {
			return ( strcmp( at->sat_syntax_oid, oid ) == 0 );
		}
	}

	return 0;
}

int is_at_subtype(
	AttributeType *sub,
	AttributeType *sup )
{
	for( ; sub != NULL; sub = sub->sat_sup ) {
		if( sub == sup ) return 1;
	}

	return 0;
}

struct aindexrec {
	struct berval	air_name;
	AttributeType	*air_at;
};

static Avlnode	*attr_index = NULL;
static LDAP_SLIST_HEAD(ATList, slap_attribute_type) attr_list
	= LDAP_SLIST_HEAD_INITIALIZER(&attr_list);
	
ldap_pvt_thread_mutex_t at_mutex;

static int
attr_index_cmp(
    const void	*v_air1,
    const void	*v_air2
)
{
	const struct aindexrec	*air1 = v_air1;
	const struct aindexrec	*air2 = v_air2;
	int i = air1->air_name.bv_len - air2->air_name.bv_len;
	if (i)
		return i;
	return (strcasecmp( air1->air_name.bv_val, air2->air_name.bv_val ));
}

static int
attr_index_name_cmp(
    const void	*v_type,
    const void	*v_air
)
{
    const struct berval    *type = v_type;
    const struct aindexrec *air  = v_air;
	int i = type->bv_len - air->air_name.bv_len;
	if (i)
		return i;
	return (strncasecmp( type->bv_val, air->air_name.bv_val,
		type->bv_len ));
}

AttributeType *
at_find(
    const char		*name
)
{
	struct berval bv;

	bv.bv_val = (char *)name;
	bv.bv_len = strlen( name );

	return at_bvfind( &bv );
}

AttributeType *
at_bvfind(
    struct berval	*name
)
{
	struct aindexrec *air;

	ldap_pvt_thread_mutex_lock( &at_mutex );
	air = avl_find( attr_index, name, attr_index_name_cmp );
	ldap_pvt_thread_mutex_unlock( &at_mutex );

	return air != NULL ? air->air_at : NULL;
}

int
at_append_to_list(
    AttributeType	*sat,
    AttributeType	***listp
)
{
	AttributeType	**list;
	AttributeType	**list1;
	int		size;

	list = *listp;
	if ( !list ) {
		size = 2;
		list = ch_calloc(size, sizeof(AttributeType *));
		if ( !list ) {
			return -1;
		}
	} else {
		size = 0;
		list1 = *listp;
		while ( *list1 ) {
			size++;
			list1++;
		}
		size += 2;
		list1 = ch_realloc(list, size*sizeof(AttributeType *));
		if ( !list1 ) {
			return -1;
		}
		list = list1;
	}
	list[size-2] = sat;
	list[size-1] = NULL;
	*listp = list;
	return 0;
}

int
at_delete_from_list(
    int			pos,
    AttributeType	***listp
)
{
	AttributeType	**list;
	AttributeType	**list1;
	int		i;
	int		j;

	if ( pos < 0 ) {
		return -2;
	}
	list = *listp;
	for ( i=0; list[i]; i++ )
		;
	if ( pos >= i ) {
		return -2;
	}
	for ( i=pos, j=pos+1; list[j]; i++, j++ ) {
		list[i] = list[j];
	}
	list[i] = NULL;
	/* Tell the runtime this can be shrinked */
	list1 = ch_realloc(list, (i+1)*sizeof(AttributeType **));
	if ( !list1 ) {
		return -1;
	}
	*listp = list1;
	return 0;
}

int
at_find_in_list(
    AttributeType	*sat,
    AttributeType	**list
)
{
	int	i;

	if ( !list ) {
		return -1;
	}
	for ( i=0; list[i]; i++ ) {
		if ( sat == list[i] ) {
			return i;
		}
	}
	return -1;
}

void
at_destroy( void )
{
	AttributeType *a;
	ldap_pvt_thread_mutex_lock( &at_mutex );
	avl_free(attr_index, ldap_memfree);

	while( !LDAP_SLIST_EMPTY(&attr_list) ) {
		a = LDAP_SLIST_FIRST(&attr_list);
		LDAP_SLIST_REMOVE_HEAD(&attr_list, sat_next);

		if (a->sat_subtypes) ldap_memfree(a->sat_subtypes);
		ad_destroy(a->sat_ad);
		ldap_pvt_thread_mutex_destroy(&a->sat_ad_mutex);
		ldap_attributetype_free((LDAPAttributeType *)a);
	}

	if ( slap_schema.si_at_undefined ) {
		ad_destroy(slap_schema.si_at_undefined->sat_ad);
	}
	ldap_pvt_thread_mutex_unlock( &at_mutex );
}

int
at_start( AttributeType **at )
{
	assert( at );

	ldap_pvt_thread_mutex_lock( &at_mutex );
	*at = LDAP_SLIST_FIRST(&attr_list);
	ldap_pvt_thread_mutex_unlock( &at_mutex );

	return (*at != NULL);
}

int
at_next( AttributeType **at )
{
	assert( at );

	ldap_pvt_thread_mutex_lock( &at_mutex );
#if 1	/* pedantic check */
	{
		AttributeType *tmp = NULL;

		LDAP_SLIST_FOREACH(tmp,&attr_list,sat_next) {
			if ( tmp == *at ) {
				break;
			}
		}

		assert( tmp );
	}
#endif

	*at = LDAP_SLIST_NEXT(*at,sat_next);
	ldap_pvt_thread_mutex_unlock( &at_mutex );

	return (*at != NULL);
}
	


static int
at_insert(
    AttributeType	*sat,
    const char		**err
)
{
	struct aindexrec	*air;
	char			**names;

	ldap_pvt_thread_mutex_lock( &at_mutex );
	LDAP_SLIST_NEXT( sat, sat_next ) = NULL;
	LDAP_SLIST_INSERT_HEAD( &attr_list, sat, sat_next );

	if ( sat->sat_oid ) {
		air = (struct aindexrec *)
			ch_calloc( 1, sizeof(struct aindexrec) );
		air->air_name.bv_val = sat->sat_oid;
		air->air_name.bv_len = strlen(sat->sat_oid);
		air->air_at = sat;
		if ( avl_insert( &attr_index, (caddr_t) air,
		                 attr_index_cmp, avl_dup_error ) ) {
			*err = sat->sat_oid;
			ldap_memfree(air);
			ldap_pvt_thread_mutex_unlock( &at_mutex );
			return SLAP_SCHERR_ATTR_DUP;
		}
		ldap_pvt_thread_mutex_unlock( &at_mutex );
		/* FIX: temporal consistency check */
		at_bvfind(&air->air_name);
	}

	if ( (names = sat->sat_names) ) {
		while ( *names ) {
			air = (struct aindexrec *)
				ch_calloc( 1, sizeof(struct aindexrec) );
			air->air_name.bv_val = *names;
			air->air_name.bv_len = strlen(*names);
			air->air_at = sat;
			ldap_pvt_thread_mutex_lock( &at_mutex );
			if ( avl_insert( &attr_index, (caddr_t) air,
			                 attr_index_cmp, avl_dup_error ) ) {
				*err = *names;
				ldap_memfree(air);
				ldap_pvt_thread_mutex_unlock( &at_mutex );
				return SLAP_SCHERR_ATTR_DUP;
			}
			ldap_pvt_thread_mutex_unlock( &at_mutex );
			/* FIX: temporal consistency check */
			at_bvfind(&air->air_name);
			names++;
		}
	}

	return 0;
}

int
at_add(
    LDAPAttributeType	*at,
    const char		**err
)
{
	AttributeType	*sat;
	MatchingRule	*mr;
	Syntax		*syn;
	int		i;
	int		code;
	char	*cname;
	char	*oid;

	if ( !OID_LEADCHAR( at->at_oid[0] )) {
		/* Expand OID macros */
		oid = oidm_find( at->at_oid );
		if ( !oid ) {
			*err = at->at_oid;
			return SLAP_SCHERR_OIDM;
		}
		if ( oid != at->at_oid ) {
			ldap_memfree( at->at_oid );
			at->at_oid = oid;
		}
	}

	if ( at->at_syntax_oid && !OID_LEADCHAR( at->at_syntax_oid[0] )) {
		/* Expand OID macros */
		oid = oidm_find( at->at_syntax_oid );
		if ( !oid ) {
			*err = at->at_syntax_oid;
			return SLAP_SCHERR_OIDM;
		}
		if ( oid != at->at_syntax_oid ) {
			ldap_memfree( at->at_syntax_oid );
			at->at_syntax_oid = oid;
		}
	}

	if ( at->at_names && at->at_names[0] ) {
		int i;

		for( i=0; at->at_names[i]; i++ ) {
			if( !slap_valid_descr( at->at_names[i] ) ) {
				*err = at->at_names[i];
				return SLAP_SCHERR_BAD_DESCR;
			}
		}

		cname = at->at_names[0];

	} else if ( at->at_oid ) {
		cname = at->at_oid;

	} else {
		*err = "";
		return SLAP_SCHERR_ATTR_INCOMPLETE;
	}

	*err = cname;

	if ( !at->at_usage && at->at_no_user_mod ) {
		/* user attribute must be modifable */
		return SLAP_SCHERR_ATTR_BAD_USAGE;
	}

	if ( at->at_collective ) {
		if( at->at_usage ) {
			/* collective attributes cannot be operational */
			return SLAP_SCHERR_ATTR_BAD_USAGE;
		}

		if( at->at_single_value ) {
			/* collective attributes cannot be single-valued */
			return SLAP_SCHERR_ATTR_BAD_USAGE;
		}
	}

	sat = (AttributeType *) ch_calloc( 1, sizeof(AttributeType) );
	AC_MEMCPY( &sat->sat_atype, at, sizeof(LDAPAttributeType));

	sat->sat_cname.bv_val = cname;
	sat->sat_cname.bv_len = strlen( cname );
	ldap_pvt_thread_mutex_init(&sat->sat_ad_mutex);

	if ( at->at_sup_oid ) {
		AttributeType *supsat = at_find(at->at_sup_oid);

		if ( supsat == NULL ) {
			*err = at->at_sup_oid;
			return SLAP_SCHERR_ATTR_NOT_FOUND;
		}

		sat->sat_sup = supsat;

		if ( at_append_to_list(sat, &supsat->sat_subtypes) ) {
			return SLAP_SCHERR_OUTOFMEM;
		}

		if ( sat->sat_usage != supsat->sat_usage ) {
			/* subtypes must have same usage as their SUP */
			return SLAP_SCHERR_ATTR_BAD_USAGE;
		}

		if ( supsat->sat_obsolete && !sat->sat_obsolete ) {
			/* subtypes must be obsolete if super is */
			return SLAP_SCHERR_ATTR_BAD_SUP;
		}

		if ( sat->sat_flags & SLAP_AT_FINAL ) {
			/* cannot subtype a "final" attribute type */
			return SLAP_SCHERR_ATTR_BAD_SUP;
		}
	}

	/*
	 * Inherit definitions from superiors.  We only check the
	 * direct superior since that one has already inherited from
	 * its own superiorss
	 */
	if ( sat->sat_sup ) {
		sat->sat_syntax = sat->sat_sup->sat_syntax;
		sat->sat_equality = sat->sat_sup->sat_equality;
		sat->sat_approx = sat->sat_sup->sat_approx;
		sat->sat_ordering = sat->sat_sup->sat_ordering;
		sat->sat_substr = sat->sat_sup->sat_substr;
	}

	if ( at->at_syntax_oid ) {
		syn = syn_find(sat->sat_syntax_oid);
		if ( syn == NULL ) {
			*err = sat->sat_syntax_oid;
			return SLAP_SCHERR_SYN_NOT_FOUND;
		}

		if( sat->sat_syntax != NULL && sat->sat_syntax != syn ) {
			return SLAP_SCHERR_ATTR_BAD_SUP;
		}

		sat->sat_syntax = syn;

	} else if ( sat->sat_syntax == NULL ) {
		return SLAP_SCHERR_ATTR_INCOMPLETE;
	}

	if ( sat->sat_equality_oid ) {
		mr = mr_find(sat->sat_equality_oid);

		if( mr == NULL ) {
			*err = sat->sat_equality_oid;
			return SLAP_SCHERR_MR_NOT_FOUND;
		}

		if(( mr->smr_usage & SLAP_MR_EQUALITY ) != SLAP_MR_EQUALITY ) {
			*err = sat->sat_equality_oid;
			return SLAP_SCHERR_ATTR_BAD_MR;
		}

		if( sat->sat_syntax != mr->smr_syntax ) {
			if( mr->smr_compat_syntaxes == NULL ) {
				*err = sat->sat_equality_oid;
				return SLAP_SCHERR_ATTR_BAD_MR;
			}

			for(i=0; mr->smr_compat_syntaxes[i]; i++) {
				if( sat->sat_syntax == mr->smr_compat_syntaxes[i] ) {
					i = -1;
					break;
				}
			}

			if( i >= 0 ) {
				*err = sat->sat_equality_oid;
				return SLAP_SCHERR_ATTR_BAD_MR;
			}
		}

		sat->sat_equality = mr;
		sat->sat_approx = mr->smr_associated;
	}

	if ( sat->sat_ordering_oid ) {
		if( !sat->sat_equality ) {
			*err = sat->sat_ordering_oid;
			return SLAP_SCHERR_ATTR_BAD_MR;
		}

		mr = mr_find(sat->sat_ordering_oid);

		if( mr == NULL ) {
			*err = sat->sat_ordering_oid;
			return SLAP_SCHERR_MR_NOT_FOUND;
		}

		if(( mr->smr_usage & SLAP_MR_ORDERING ) != SLAP_MR_ORDERING ) {
			*err = sat->sat_ordering_oid;
			return SLAP_SCHERR_ATTR_BAD_MR;
		}

		if( sat->sat_syntax != mr->smr_syntax ) {
			if( mr->smr_compat_syntaxes == NULL ) {
				*err = sat->sat_ordering_oid;
				return SLAP_SCHERR_ATTR_BAD_MR;
			}

			for(i=0; mr->smr_compat_syntaxes[i]; i++) {
				if( sat->sat_syntax == mr->smr_compat_syntaxes[i] ) {
					i = -1;
					break;
				}
			}

			if( i >= 0 ) {
				*err = sat->sat_ordering_oid;
				return SLAP_SCHERR_ATTR_BAD_MR;
			}
		}

		sat->sat_ordering = mr;
	}

	if ( sat->sat_substr_oid ) {
		if( !sat->sat_equality ) {
			*err = sat->sat_substr_oid;
			return SLAP_SCHERR_ATTR_BAD_MR;
		}

		mr = mr_find(sat->sat_substr_oid);

		if( mr == NULL ) {
			*err = sat->sat_substr_oid;
			return SLAP_SCHERR_MR_NOT_FOUND;
		}

		if(( mr->smr_usage & SLAP_MR_SUBSTR ) != SLAP_MR_SUBSTR ) {
			*err = sat->sat_substr_oid;
			return SLAP_SCHERR_ATTR_BAD_MR;
		}

		/* due to funky LDAP builtin substring rules,
		 * we check against the equality rule assertion
		 * syntax and compat syntaxes instead of those
		 * associated with the substrings rule.
		 */
		if( sat->sat_syntax != sat->sat_equality->smr_syntax ) {
			if( sat->sat_equality->smr_compat_syntaxes == NULL ) {
				*err = sat->sat_substr_oid;
				return SLAP_SCHERR_ATTR_BAD_MR;
			}

			for(i=0; sat->sat_equality->smr_compat_syntaxes[i]; i++) {
				if( sat->sat_syntax ==
					sat->sat_equality->smr_compat_syntaxes[i] )
				{
					i = -1;
					break;
				}
			}

			if( i >= 0 ) {
				*err = sat->sat_substr_oid;
				return SLAP_SCHERR_ATTR_BAD_MR;
			}
		}

		sat->sat_substr = mr;
	}

	code = at_insert(sat,err);
	return code;
}

#ifdef LDAP_DEBUG
static int
at_index_printnode( void *v_air, void *ignore )
{
	struct aindexrec *air = v_air;
	printf("%s = %s\n",
		air->air_name.bv_val,
		ldap_attributetype2str(&air->air_at->sat_atype) );
	return( 0 );
}

static void
at_index_print( void )
{
	printf("Printing attribute type index:\n");
	(void) avl_apply( attr_index, at_index_printnode, 0, -1, AVL_INORDER );
}
#endif

int
at_schema_info( Entry *e )
{
	AttributeDescription *ad_attributeTypes = slap_schema.si_ad_attributeTypes;
	AttributeType	*at;
	struct berval	val;
	struct berval	nval;

	ldap_pvt_thread_mutex_lock( &at_mutex );
	LDAP_SLIST_FOREACH(at,&attr_list,sat_next) {
		if( at->sat_flags & SLAP_AT_HIDE ) continue;

		if ( ldap_attributetype2bv( &at->sat_atype, &val ) == NULL ) {
			ldap_pvt_thread_mutex_unlock( &at_mutex );
			return -1;
		}

		nval.bv_val = at->sat_oid;
		nval.bv_len = strlen(at->sat_oid);

		if( attr_merge_one( e, ad_attributeTypes, &val, &nval ) )
		{
			ldap_pvt_thread_mutex_unlock( &at_mutex );
			return -1;
		}
		ldap_memfree( val.bv_val );
	}
	ldap_pvt_thread_mutex_unlock( &at_mutex );
	return 0;
}
