index.c 11.2 KB
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/* index.c - routines for dealing with attribute indexes */

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#include "portable.h"

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

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#include "slap.h"
#include "back-ldbm.h"

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static int	add_value(Backend *be,
			  struct dbcache *db,
			  char *type,
			  int indextype,
			  char *val,
			  ID id);
static int	delete_value(Backend *be,
			     struct dbcache *db,
			     char *type,
			     int indextype,
			     char *val,
			     ID id);
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static int	index2prefix(int indextype);
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int
index_add_entry(
    Backend	*be,
    Entry	*e
)
{
	Attribute	*ap;
	struct berval	bv;
	struct berval	*bvals[2];

	Debug( LDAP_DEBUG_TRACE, "=> index_add( %ld, \"%s\" )\n", e->e_id,
	    e->e_dn, 0 );

	/*
	 * dn index entry - make it look like an attribute so it works
	 * with index_add_values() call
	 */

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	bv.bv_val = ch_strdup( e->e_ndn );
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	bv.bv_len = strlen( bv.bv_val );
	bvals[0] = &bv;
	bvals[1] = NULL;

	/* add the dn to the indexes */
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	{
		char *dn = ch_strdup("dn");
		index_add_values( be, dn, bvals, e->e_id );
		free( dn );
	}
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	free( bv.bv_val );

	/* add each attribute to the indexes */
	for ( ap = e->e_attrs; ap != NULL; ap = ap->a_next ) {
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		index_add_values( be, ap->a_type, ap->a_vals, e->e_id );
	}

	Debug( LDAP_DEBUG_TRACE, "<= index_add( %ld, \"%s\" ) 0\n", e->e_id,
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	    e->e_ndn, 0 );
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	return( 0 );
}

int
index_add_mods(
    Backend	*be,
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    LDAPModList	*ml,
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    ID		id
)
{
	int	rc;

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	for ( ; ml != NULL; ml = ml->ml_next ) {
		LDAPMod *mod = &ml->ml_mod;

		switch ( mod->mod_op & ~LDAP_MOD_BVALUES ) {
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		case LDAP_MOD_REPLACE:
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			/* XXX: Delete old index data==>problem when this 
			 * gets called we lost values already!
			 */
		case LDAP_MOD_ADD:
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			rc = index_add_values( be, mod->mod_type,
			    mod->mod_bvalues, id );
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			break;
		case LDAP_MOD_DELETE:
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			rc =  index_delete_values( be, mod->mod_type,
			    mod->mod_bvalues, id );
			break;
 		case LDAP_MOD_SOFTADD:	/* SOFTADD means index was there */
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			rc = 0;
			break;
		}

		if ( rc != 0 ) {
			return( rc );
		}
	}

	return( 0 );
}

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ID_BLOCK *
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index_read(
    Backend	*be,
    char	*type,
    int		indextype,
    char	*val
)
{
	struct dbcache	*db;
	Datum   	key;
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	ID_BLOCK		*idl;
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	int		indexmask, syntax;
	char		prefix;
	char		*realval, *tmpval;
	char		buf[BUFSIZ];

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	char		*at_cn;
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	ldbm_datum_init( key );
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	prefix = index2prefix( indextype );
	Debug( LDAP_DEBUG_TRACE, "=> index_read( \"%s\" \"%c\" \"%s\" )\n",
	    type, prefix, val );

	attr_masks( be->be_private, type, &indexmask, &syntax );
	if ( ! (indextype & indexmask) ) {
		idl =  idl_allids( be );
		Debug( LDAP_DEBUG_TRACE,
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		    "<= index_read %ld candidates (allids - not indexed)\n",
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		    idl ? ID_BLOCK_NIDS(idl) : 0, 0, 0 );
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		return( idl );
	}

	attr_normalize( type );
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	at_cn = at_canonical_name( type );
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	if ( (db = ldbm_cache_open( be, at_cn, LDBM_SUFFIX, LDBM_WRCREAT ))
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	    == NULL ) {
		Debug( LDAP_DEBUG_ANY,
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		    "<= index_read NULL (could not open %s%s)\n", at_cn,
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		    LDBM_SUFFIX, 0 );
		return( NULL );
	}

	realval = val;
	tmpval = NULL;
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	if ( prefix != UNKNOWN_PREFIX ) {
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              unsigned int	len = strlen( val );
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              if ( (len + 2) < sizeof(buf) ) {
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			realval = buf;
		} else {
			/* value + prefix + null */
			tmpval = (char *) ch_malloc( len + 2 );
			realval = tmpval;
		}
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              realval[0] = prefix;
              strcpy( &realval[1], val );
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	}

	key.dptr = realval;
	key.dsize = strlen( realval ) + 1;

	idl = idl_fetch( be, db, key );
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      if ( tmpval != NULL ) {
              free( tmpval );
      }
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	ldbm_cache_close( be, db );

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	Debug( LDAP_DEBUG_TRACE, "<= index_read %ld candidates\n",
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	    idl ? ID_BLOCK_NIDS(idl) : 0, 0, 0 );
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	return( idl );
}

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/* Remove values from index files */

static int
delete_value(
    Backend		*be,
    struct dbcache	*db,
    char		*type,
    int			indextype,
    char		*val,
    ID			id
)
{

	return 0;

}/* static int delete_value() */

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static int
add_value(
    Backend		*be,
    struct dbcache	*db,
    char		*type,
    int			indextype,
    char		*val,
    ID			id
)
{
	int	rc;
	Datum   key;
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	/* XXX do we need idl ??? */
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	ID_BLOCK	*idl = NULL;
	char	*tmpval = NULL;
	char	*realval = val;
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	char	buf[BUFSIZ];

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	char	prefix = index2prefix( indextype );

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	ldbm_datum_init( key );
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	Debug( LDAP_DEBUG_TRACE, "=> add_value( \"%c%s\" )\n", prefix, val, 0 );

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	if ( prefix != UNKNOWN_PREFIX ) {
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              unsigned int     len = strlen( val );
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              if ( (len + 2) < sizeof(buf) ) {
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			realval = buf;
		} else {
			/* value + prefix + null */
			tmpval = (char *) ch_malloc( len + 2 );
			realval = tmpval;
		}
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              realval[0] = prefix;
              strcpy( &realval[1], val );
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	}

	key.dptr = realval;
	key.dsize = strlen( realval ) + 1;

	rc = idl_insert_key( be, db, key, id );

	if ( tmpval != NULL ) {
		free( tmpval );
	}
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	if( idl != NULL ) {
		idl_free( idl );
	}
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	ldap_pvt_thread_yield();
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	/* Debug( LDAP_DEBUG_TRACE, "<= add_value %d\n", rc, 0, 0 ); */
	return( rc );
}

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/* Remove entries from index files */

int
index_delete_values(
    Backend		*be,
    char		*type,
    struct berval	**vals,
    ID			id
)
{
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	int		indexmask, syntax;
	char		*at_cn;	/* Attribute canonical name */
	struct dbcache	*db;
	char		*val, *p, *code, *w;
	unsigned	i, j, len;
	char		buf[SUBLEN + 1];
	char		vbuf[BUFSIZ];
	char		*bigbuf;


	Debug( LDAP_DEBUG_TRACE,
	       "=> index_delete_values( \"%s\", %ld )\n", 
	       (type ? type : "(NULL)"),
	       id,
	       0 );
	       
	attr_normalize(type);
	attr_masks( be->be_private, type, &indexmask, &syntax );
	
	if ( indexmask == 0 ) {
		return( 0 );
	}

	at_cn = at_canonical_name( type );

	if ( (db = ldbm_cache_open( be, at_cn, LDBM_SUFFIX, LDBM_WRITER ))
	     == NULL ) {

		Debug( LDAP_DEBUG_ANY,
		       "<= index_delete_values -1 (could not open(wr) %s%s)\n",
		       at_cn,
		       LDBM_SUFFIX,
		       0 );
		return( -1 );

	}

	/* Remove each value from index file */
	
	for ( i = 0; vals[i] != NULL; i++ ) {

		/*
		 * Presence index entry
		 */

		if ( indexmask & INDEX_PRESENCE ) {
			delete_value( be, db, at_cn, INDEX_PRESENCE, "*", id );
		}

		Debug( LDAP_DEBUG_TRACE,
		       "*** index_add_values syntax 0x%x syntax bin 0x%x\n",
		       syntax, SYNTAX_BIN, 0 );

		if ( syntax & SYNTAX_BIN ) {
			ldbm_cache_close( be, db );
			return( 0 );
		}

		bigbuf = NULL;
		len = vals[i]->bv_len;

		/* value + null */
		if ( len + 2 > sizeof(vbuf) ) {

			bigbuf = (char *) ch_malloc( len + 1 );
			val = bigbuf;

		} else {

			val = vbuf;

		}

		(void) memcpy( val, vals[i]->bv_val, len );
		val[len] = '\0';

		value_normalize( val, syntax );

		/* value_normalize could change the length of val */

		len = strlen( val );

		/*
		 * equality index entry
		 */

		if ( indexmask & INDEX_EQUALITY ) {
		    
			delete_value( be, db, at_cn, INDEX_EQUALITY, val, id );

		}

		/*
		 * approximate index entry
		 */
		if ( indexmask & INDEX_APPROX ) {
		    
			for ( w = first_word( val );
			      w != NULL;
			      w = next_word( w ) ) {
			    
				if ( (code = phonetic( w )) != NULL ) {

					delete_value( be,
						      db,
						      at_cn,
						      INDEX_APPROX,
						      code,
						      id );
					free( code );
				}
			}

		}

		/*
		 * substrings index entry
		 */

		if ( indexmask & INDEX_SUB ) {

			/* leading and trailing */
			if ( len > SUBLEN - 2 ) {

				buf[0] = '^';
				for ( j = 0; j < SUBLEN - 1; j++ ) {
					buf[j + 1] = val[j];
				}
				buf[SUBLEN] = '\0';

				delete_value( be,
					      db,
					      at_cn,
					      INDEX_SUB,
					      buf,
					      id );

				p = val + len - SUBLEN + 1;
				for ( j = 0; j < SUBLEN - 1; j++ ) {
					buf[j] = p[j];
				}
				buf[SUBLEN - 1] = '$';
				buf[SUBLEN] = '\0';

				delete_value( be,
					      db,
					      at_cn,
					      INDEX_SUB,
					      buf,
					      id );

			}

			/* any */

			for (p = val; p < (val + len - SUBLEN + 1); p++) {

				for ( j = 0; j < SUBLEN; j++ ) {
					buf[j] = p[j];
				}
				buf[SUBLEN] = '\0';

				delete_value( be,
					      db,
					      at_cn,
					      INDEX_SUB,
					      buf,
					      id );
			}/* for (p = val; p < (val + len - SUBLEN + 1); p++) */

		}/* if ( indexmask & INDEX_SUB ) */

		if ( bigbuf != NULL ) {

			free( bigbuf );

		}

	}/* for ( i = 0; vals[i] != NULL; i++ ) */

	ldbm_cache_close( be, db );
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	return 0;

}

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int
index_add_values(
    Backend		*be,
    char		*type,
    struct berval	**vals,
    ID			id
)
{
	char		*val, *p, *code, *w;
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	unsigned	i, j, len;
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	int		indexmask, syntax;
	char		buf[SUBLEN + 1];
	char		vbuf[BUFSIZ];
	char		*bigbuf;
	struct dbcache	*db;

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	char		*at_cn;	/* Attribute canonical name */
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	Debug( LDAP_DEBUG_TRACE, "=> index_add_values( \"%s\", %ld )\n", type,
	    id, 0 );
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	attr_normalize(type);
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	attr_masks( be->be_private, type, &indexmask, &syntax );
	if ( indexmask == 0 ) {
		return( 0 );
	}
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	at_cn = at_canonical_name( type );
	if ( (db = ldbm_cache_open( be, at_cn, LDBM_SUFFIX, LDBM_WRCREAT ))
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	    == NULL ) {
		Debug( LDAP_DEBUG_ANY,
		    "<= index_add_values -1 (could not open/create %s%s)\n",
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		    at_cn, LDBM_SUFFIX, 0 );
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		return( -1 );
	}


	for ( i = 0; vals[i] != NULL; i++ ) {
		/*
		 * presence index entry
		 */
		if ( indexmask & INDEX_PRESENCE ) {
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			add_value( be, db, at_cn, INDEX_PRESENCE, "*", id );
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		}

		Debug( LDAP_DEBUG_TRACE, "*** index_add_values syntax 0x%x syntax bin 0x%x\n",
		    syntax, SYNTAX_BIN, 0 );
		if ( syntax & SYNTAX_BIN ) {
			ldbm_cache_close( be, db );
			return( 0 );
		}

		bigbuf = NULL;
		len = vals[i]->bv_len;

		/* value + null */
		if ( len + 2 > sizeof(vbuf) ) {
			bigbuf = (char *) ch_malloc( len + 1 );
			val = bigbuf;
		} else {
			val = vbuf;
		}
		(void) memcpy( val, vals[i]->bv_val, len );
		val[len] = '\0';

		value_normalize( val, syntax );

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		/* value_normalize could change the length of val */
		len = strlen( val );

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		/*
		 * equality index entry
		 */
		if ( indexmask & INDEX_EQUALITY ) {
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			add_value( be, db, at_cn, INDEX_EQUALITY, val, id );
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		}

		/*
		 * approximate index entry
		 */
		if ( indexmask & INDEX_APPROX ) {
			for ( w = first_word( val ); w != NULL;
			    w = next_word( w ) ) {
				if ( (code = phonetic( w )) != NULL ) {
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					add_value( be, db, at_cn, INDEX_APPROX,
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					    code, id );
					free( code );
				}
			}
		}

		/*
		 * substrings index entry
		 */
		if ( indexmask & INDEX_SUB ) {
			/* leading and trailing */
			if ( len > SUBLEN - 2 ) {
				buf[0] = '^';
				for ( j = 0; j < SUBLEN - 1; j++ ) {
					buf[j + 1] = val[j];
				}
				buf[SUBLEN] = '\0';

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				add_value( be, db, at_cn, INDEX_SUB, buf, id );
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				p = val + len - SUBLEN + 1;
				for ( j = 0; j < SUBLEN - 1; j++ ) {
					buf[j] = p[j];
				}
				buf[SUBLEN - 1] = '$';
				buf[SUBLEN] = '\0';

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				add_value( be, db, at_cn, INDEX_SUB, buf, id );
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			}

			/* any */
			for ( p = val; p < (val + len - SUBLEN + 1); p++ ) {
				for ( j = 0; j < SUBLEN; j++ ) {
					buf[j] = p[j];
				}
				buf[SUBLEN] = '\0';

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				add_value( be, db, at_cn, INDEX_SUB, buf, id );
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			}
		}

		if ( bigbuf != NULL ) {
			free( bigbuf );
		}
	}
	ldbm_cache_close( be, db );

	return( 0 );
}

static int
index2prefix( int indextype )
{
	int	prefix;

	switch ( indextype ) {
	case INDEX_EQUALITY:
		prefix = EQ_PREFIX;
		break;
	case INDEX_APPROX:
		prefix = APPROX_PREFIX;
		break;
	case INDEX_SUB:
		prefix = SUB_PREFIX;
		break;
	default:
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		prefix = UNKNOWN_PREFIX;
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		break;
	}

	return( prefix );
}