openldap/servers/slapd/entry.c

/* entry.c - routines for dealing with entries */
/* $OpenLDAP$ */
/*
 * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
 */

#include "portable.h"

#include <stdio.h>

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

#include "slap.h"
#include "ldif.h"

static unsigned char	*ebuf;	/* buf returned by entry2str		 */
static unsigned char	*ecur;	/* pointer to end of currently used ebuf */
static int		emaxsize;/* max size of ebuf			 */

/*
 * Empty root entry
 */
const Entry slap_entry_root = { NOID, "", "", NULL, NULL };

int entry_destroy(void)
{
	free( ebuf );
	ebuf = NULL;
	ecur = NULL;
	emaxsize = 0;
	return 0;
}


Entry *
str2entry( char *s )
{
	int rc;
	Entry		*e;
	char		*type;
	struct berval value;
	struct berval	*vals[2];
	AttributeDescription *ad;
	const char *text;
	char	*next;

	/*
	 * LDIF is used as the string format.
	 * An entry looks like this:
	 *
	 *	dn: <dn>\n
	 *	[<attr>:[:] <value>\n]
	 *	[<tab><continuedvalue>\n]*
	 *	...
	 *
	 * If a double colon is used after a type, it means the
	 * following value is encoded as a base 64 string.  This
	 * happens if the value contains a non-printing character
	 * or newline.
	 */

#ifdef NEW_LOGGING
	LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
		   "str2entry: \"%s\"\n", s ? s : "NULL" ));
#else
	Debug( LDAP_DEBUG_TRACE, "=> str2entry\n",
		s ? s : "NULL", 0, 0 );
#endif

	/* initialize reader/writer lock */
	e = (Entry *) ch_malloc( sizeof(Entry) );

	if( e == NULL ) {
#ifdef NEW_LOGGING
		LDAP_LOG(( "operation", LDAP_LEVEL_ERR,
			   "str2entry: entry allocation failed.\n" ));
#else
		Debug( LDAP_DEBUG_ANY,
		    "<= str2entry NULL (entry allocation failed)\n",
		    0, 0, 0 );
#endif
		return( NULL );
	}

	/* initialize entry */
	e->e_id = NOID;
	e->e_dn = NULL;
	e->e_ndn = NULL;
	e->e_attrs = NULL;
	e->e_private = NULL;

	/* dn + attributes */
	vals[0] = &value;
	vals[1] = NULL;

	next = s;
	while ( (s = ldif_getline( &next )) != NULL ) {
		if ( *s == '\n' || *s == '\0' ) {
			break;
		}

		if ( ldif_parse_line( s, &type, &value.bv_val, &value.bv_len ) != 0 ) {
#ifdef NEW_LOGGING
			LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
				   "str2entry:  NULL (parse_line)\n" ));
#else
			Debug( LDAP_DEBUG_TRACE,
			    "<= str2entry NULL (parse_line)\n", 0, 0, 0 );
#endif
			continue;
		}

		if ( strcasecmp( type, "dn" ) == 0 ) {
			free( type );

			if ( e->e_dn != NULL ) {
#ifdef NEW_LOGGING
				LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1, "str2entry: "
					"entry %ld has multiple dns \"%s\" and \"%s\" "
					"(second ignored)\n",
					(long) e->e_id, e->e_dn, value.bv_val != NULL ? value.bv_val : "" ));
#else
				Debug( LDAP_DEBUG_ANY, "str2entry: "
					"entry %ld has multiple dns \"%s\" and \"%s\" "
					"(second ignored)\n",
				    (long) e->e_id, e->e_dn,
					value.bv_val != NULL ? value.bv_val : "" );
#endif
				if( value.bv_val != NULL ) free( value.bv_val );
				continue;
			}

			e->e_dn = value.bv_val != NULL ? value.bv_val : ch_strdup( "" );
			continue;
		}

		ad = NULL;
		rc = slap_str2ad( type, &ad, &text );

		if( rc != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
			LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
				   "str2entry:  str2ad(%s):	 %s\n", type, text ));
#else
			Debug( slapMode & SLAP_TOOL_MODE
				? LDAP_DEBUG_ANY : LDAP_DEBUG_TRACE,
				"<= str2entry: str2ad(%s): %s\n", type, text, 0 );
#endif
			if( slapMode & SLAP_TOOL_MODE ) {
				entry_free( e );
				free( value.bv_val );
				free( type );
				return NULL;
			}

			rc = slap_str2undef_ad( type, &ad, &text );

			if( rc != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
				LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
					   "str2entry:  str2undef_ad(%s):  %s\n", type, text ));
#else
				Debug( LDAP_DEBUG_ANY,
					"<= str2entry: str2undef_ad(%s): %s\n",
						type, text, 0 );
#endif
				entry_free( e );
				free( value.bv_val );
				free( type );
				return NULL;
			}
		}

		if( slapMode & SLAP_TOOL_MODE ) {
			slap_syntax_validate_func *validate =
				ad->ad_type->sat_syntax->ssyn_validate;

			if( !validate ) {
#ifdef NEW_LOGGING
				LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
					   "str2entry: no validator for syntax %s\n", 
					   ad->ad_type->sat_syntax->ssyn_oid ));
#else
				Debug( LDAP_DEBUG_ANY,
					"str2entry: no validator for syntax %s\n",
					ad->ad_type->sat_syntax->ssyn_oid, 0, 0 );
#endif
				entry_free( e );
				free( value.bv_val );
				free( type );
				return NULL;
			}

			/*
			 * validate value per syntax
			 */
			rc = validate( ad->ad_type->sat_syntax, &value );

			if( rc != 0 ) {
#ifdef NEW_LOGGING
				LDAP_LOG(( "operation", LDAP_LEVEL_ERR,
					   "str2entry:  invalid value for syntax %s\n",
					   ad->ad_type->sat_syntax->ssyn_oid ));
#else
				Debug( LDAP_DEBUG_ANY,
					"str2entry: invalid value for syntax %s\n",
					ad->ad_type->sat_syntax->ssyn_oid, 0, 0 );
#endif
				entry_free( e );
				free( value.bv_val );
				free( type );
				return NULL;
			}
		}

		rc = attr_merge( e, ad, vals );

		if( rc != 0 ) {
#ifdef NEW_LOGGING
			LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
				   "str2entry:  NULL (attr_merge)\n" ));
#else
			Debug( LDAP_DEBUG_ANY,
			    "<= str2entry NULL (attr_merge)\n", 0, 0, 0 );
#endif
			entry_free( e );
			free( value.bv_val );
			free( type );
			return( NULL );
		}

		free( type );
		free( value.bv_val );
	}

	/* check to make sure there was a dn: line */
	if ( e->e_dn == NULL ) {
#ifdef NEW_LOGGING
		LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
			   "str2entry:  entry %ld has no dn.\n",
				(long) e->e_id ));
#else
		Debug( LDAP_DEBUG_ANY, "str2entry: entry %ld has no dn\n",
		    (long) e->e_id, 0, 0 );
#endif
		entry_free( e );
		return( NULL );
	}

	/* generate normalized dn */
	e->e_ndn = ch_strdup( e->e_dn );
	(void) dn_normalize( e->e_ndn );

#ifdef NEW_LOGGING
	LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL2,
		   "str2entry(%s) -> 0x%lx\n", e->e_dn, (unsigned long)e ));
#else
	Debug(LDAP_DEBUG_TRACE, "<= str2entry(%s) -> 0x%lx\n",
		e->e_dn, (unsigned long) e, 0 );
#endif
	return( e );
}


#define GRABSIZE	BUFSIZ

#define MAKE_SPACE( n )	{ \
		while ( ecur + (n) > ebuf + emaxsize ) { \
			ptrdiff_t	offset; \
			offset = (int) (ecur - ebuf); \
			ebuf = (unsigned char *) ch_realloc( (char *) ebuf, \
			    emaxsize + GRABSIZE ); \
			emaxsize += GRABSIZE; \
			ecur = ebuf + offset; \
		} \
	}

char *
entry2str(
    Entry	*e,
    int		*len )
{
	Attribute	*a;
	struct berval	*bv;
	int		i, tmplen;

	/*
	 * In string format, an entry looks like this:
	 *	dn: <dn>\n
	 *	[<attr>: <value>\n]*
	 */

	ecur = ebuf;

	/* put the dn */
	if ( e->e_dn != NULL ) {
		/* put "dn: <dn>" */
		tmplen = strlen( e->e_dn );
		MAKE_SPACE( LDIF_SIZE_NEEDED( 2, tmplen ));
		ldif_sput( (char **) &ecur, LDIF_PUT_VALUE, "dn", e->e_dn, tmplen );
	}

	/* put the attributes */
	for ( a = e->e_attrs; a != NULL; a = a->a_next ) {
		/* put "<type>:[:] <value>" line for each value */
		for ( i = 0; a->a_vals[i] != NULL; i++ ) {
			bv = a->a_vals[i];
			tmplen = a->a_desc->ad_cname.bv_len;
			MAKE_SPACE( LDIF_SIZE_NEEDED( tmplen, bv->bv_len ));
			ldif_sput( (char **) &ecur, LDIF_PUT_VALUE,
				a->a_desc->ad_cname.bv_val,
			    bv->bv_val, bv->bv_len );
		}
	}
	MAKE_SPACE( 1 );
	*ecur = '\0';
	*len = ecur - ebuf;

	return( (char *) ebuf );
}

void
entry_free( Entry *e )
{
	/* free an entry structure */
	assert( e != NULL );

	/* e_private must be freed by the caller */
	assert( e->e_private == NULL );
	e->e_private = NULL;

	/* free DNs */
	if ( e->e_dn != NULL ) {
		free( e->e_dn );
		e->e_dn = NULL;
	}
	if ( e->e_ndn != NULL ) {
		free( e->e_ndn );
		e->e_ndn = NULL;
	}

	/* free attributes */
	attrs_free( e->e_attrs );
	e->e_attrs = NULL;

	free( e );
}

/*
 * These routines are used only by Backend.
 *
 * the Entry has three entry points (ways to find things):
 *
 *	by entry	e.g., if you already have an entry from the cache
 *			and want to delete it. (really by entry ptr)
 *	by dn		e.g., when looking for the base object of a search
 *	by id		e.g., for search candidates
 *
 * these correspond to three different avl trees that are maintained.
 */

int
entry_cmp( Entry *e1, Entry *e2 )
{
	return( e1 < e2 ? -1 : (e1 > e2 ? 1 : 0) );
}

int
entry_dn_cmp( Entry *e1, Entry *e2 )
{
	/* compare their normalized UPPERCASED dn's */
	return( strcmp( e1->e_ndn, e2->e_ndn ) );
}

int
entry_id_cmp( Entry *e1, Entry *e2 )
{
	return( e1->e_id < e2->e_id ? -1 : (e1->e_id > e2->e_id ? 1 : 0) );
}

#ifdef SLAPD_BDB

/* Flatten an Entry into a buffer. The buffer contents become a direct
 * copy of the entry, with all pointers converted to offsets from the
 * beginning of the buffer. We do this by first walking through all
 * the fields of the Entry, adding up their sizes. Then a single chunk
 * of memory is malloc'd and the entry is copied. We differentiate between
 * fixed size fields and variable-length content when tallying up the
 * entry size, so that we can stick all of the variable-length stuff
 * into the back half of the buffer.
 */
int entry_encode(Entry *e, struct berval **bv)
{
	int siz = sizeof(Entry);
	int len, dnlen, ndnlen;
	int i, j;
	Entry *f;
	Attribute *a, *b;
	struct berval **bvl, *bz;
	char *ptr, *base, *data;

	*bv = ch_malloc(sizeof(struct berval));
#ifdef NEW_LOGGING
	LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
		"entry_encode: id: 0x%08lx  \"%s\"\n",
		(long) e->e_id, e->e_dn ));
#else
	Debug( LDAP_DEBUG_TRACE, "=> entry_encode(0x%08lx): %s\n",
		(long) e->e_id, e->e_dn, 0 );
#endif
	dnlen = strlen(e->e_dn);
	ndnlen = strlen(e->e_ndn);
	len = dnlen + ndnlen + 2;	/* two trailing NUL bytes */
	for (a=e->e_attrs; a; a=a->a_next) {
		/* For AttributeDesc, we only store the attr name */
		siz += sizeof(Attribute);
		len += a->a_desc->ad_cname.bv_len+1;
		for (i=0; a->a_vals[i]; i++) {
			siz += sizeof(struct berval *);
			siz += sizeof(struct berval);
			len += a->a_vals[i]->bv_len + 1;
		}
		siz += sizeof(struct berval *);	/* NULL pointer at end */
	}
	(*bv)->bv_len = siz + len;
	(*bv)->bv_val = ch_malloc(siz+len);
	base = (*bv)->bv_val;
	ptr = base + siz;
	f = (Entry *)base;
	data = (char *)(f+1);
	f->e_id = e->e_id;
	f->e_dn = (char *)(ptr-base);
	memcpy(ptr, e->e_dn, dnlen);
	ptr += dnlen;
	*ptr++ = '\0';
	f->e_ndn = (char *)(ptr-base);
	memcpy(ptr, e->e_ndn, ndnlen);
	ptr += ndnlen;
	*ptr++ = '\0';
	f->e_attrs = e->e_attrs ? (Attribute *)sizeof(Entry) : NULL;
	f->e_private = NULL;
	for (a=e->e_attrs; a; a=a->a_next) {
		b = (Attribute *)data;
		data = (char *)(b+1);
		b->a_desc = (AttributeDescription *)(ptr-base);
		memcpy(ptr, a->a_desc->ad_cname.bv_val,
			a->a_desc->ad_cname.bv_len);
		ptr += a->a_desc->ad_cname.bv_len;
		*ptr++ = '\0';
		if (a->a_vals) {
		    bvl = (struct berval **)data;
		    b->a_vals = (struct berval **)(data-base);
		    for (i=0; a->a_vals[i]; i++);
		    data = (char *)(bvl+i+1);
		    bz = (struct berval *)data;
		    for (j=0; j<i; j++) {
			    bz->bv_len = a->a_vals[j]->bv_len;
			    if (a->a_vals[j]->bv_val) {
				bz->bv_val = (char *)(ptr-base);
				memcpy(ptr, a->a_vals[j]->bv_val, bz->bv_len);
			    } else {
			    	bz->bv_val = NULL;
			    }
			    ptr += bz->bv_len;
			    *ptr++ = '\0';
			    bvl[j] = (struct berval *)(data-base);
			    bz++;
			    data = (char *)bz;
		    }
		    bvl[j] = NULL;
		} else {
		    b->a_vals = NULL;
		}

		if (a->a_next)
		    b->a_next = (Attribute *)(data-base);
		else
		    b->a_next = NULL;
	}
	return 0;
}

/* Retrieve an Entry that was stored using entry_encode above.
 * All we have to do is add the buffer address to all of the
 * stored offsets. We also must lookup the stored attribute names
 * to get AttributeDescriptions. To detect if the attributes of
 * an Entry are later modified, we note that e->e_attr is always
 * a constant offset from (e).
 *
 * Note: everything is stored in a single contiguous block, so
 * you can not free individual attributes or names from this
 * structure. Attempting to do so will likely corrupt memory.
 */
int entry_decode(struct berval *bv, Entry **e)
{
	int i;
	long base;
	Attribute *a;
	Entry *x = (Entry *)bv->bv_val;
	char *type;
	const char *text;
	AttributeDescription *ad;

	base = (long)bv->bv_val;
	x->e_dn += base;
	x->e_ndn += base;
#ifdef NEW_LOGGING
	LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL2,
		   "entry_decode: \"%s\"\n", x->e_dn ));
#else
	Debug( LDAP_DEBUG_TRACE,
	    "entry_decode: \"%s\"\n",
	    x->e_dn, 0, 0 );
#endif
	x->e_private = NULL;
	if (x->e_attrs)
		x->e_attrs = (Attribute *)((long)x->e_attrs+base);
	for (a=x->e_attrs; a; a=a->a_next) {
		if (a->a_next)
			a->a_next = (Attribute *)((long)a->a_next+base);
		ad = NULL;
		type = (char *)a->a_desc+base;
		i = slap_str2ad( type, &ad, &text );

		if( i != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
			LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
				   "entry_decode: str2ad(%s): %s\n", type, text ));
#else
			Debug( LDAP_DEBUG_TRACE,
				"<= entry_decode: str2ad(%s): %s\n", type, text, 0 );
#endif
			i = slap_str2undef_ad( type, &ad, &text );

			if( i != LDAP_SUCCESS ) {
#ifdef NEW_LOGGING
				LDAP_LOG(( "operation", LDAP_LEVEL_INFO,
					   "entry_decode:  str2undef_ad(%s): %s\n", type, text));
#else
				Debug( LDAP_DEBUG_ANY,
					"<= entry_decode: str2undef_ad(%s): %s\n",
						type, text, 0 );
#endif
				return i;
			}
		}
		a->a_desc = ad;
		if (a->a_vals) {
			a->a_vals = (struct berval **)((long)a->a_vals+base);
			for (i=0; a->a_vals[i]; i++) {
				a->a_vals[i] = (struct berval *)
					((long)a->a_vals[i]+base);
				if (a->a_vals[i]->bv_val)
				    a->a_vals[i]->bv_val += base;
			}
		}
	}
#ifdef NEW_LOGGING
	LDAP_LOG(( "operation", LDAP_LEVEL_DETAIL1,
		   "entry_decode:  %s\n", x->e_dn ));
#else
	Debug(LDAP_DEBUG_TRACE, "<= entry_decode(%s)\n",
		x->e_dn, 0, 0 );
#endif
	*e = x;
	return 0;
}
#endif