From 6e128193873dde53926ece166ed8bc712b753eac Mon Sep 17 00:00:00 2001
From: Pierangelo Masarati <ando@openldap.org>
Date: Wed, 1 Dec 2004 21:47:13 +0000
Subject: [PATCH] allow undefined schema items to be returned by back-ldap and
 remapped by the rwm overlay

---
 servers/slapd/back-ldap/search.c | 17 ++++++++---
 servers/slapd/oc.c               | 48 ++++++++++++++++++++++++++++++++
 servers/slapd/overlays/rwm.c     |  4 ++-
 servers/slapd/overlays/rwmconf.c |  9 ++++++
 servers/slapd/schema_prep.c      |  2 +-
 5 files changed, 74 insertions(+), 6 deletions(-)

diff --git a/servers/slapd/back-ldap/search.c b/servers/slapd/back-ldap/search.c
index 408fb61a2d..e60d6bfc54 100644
--- a/servers/slapd/back-ldap/search.c
+++ b/servers/slapd/back-ldap/search.c
@@ -420,15 +420,24 @@ ldap_build_entry(
 			if ( pretty ) {
 				rc = pretty( attr->a_desc->ad_type->sat_syntax,
 					&attr->a_vals[i], &pval, NULL );
+
 			} else {
 				rc = validate( attr->a_desc->ad_type->sat_syntax,
 					&attr->a_vals[i] );
 			}
 
 			if ( rc != LDAP_SUCCESS ) {
-				attr->a_nvals = NULL;
-				attr_free( attr );
-				goto next_attr;
+				/* check if, by chance, it's an undefined objectClass */
+				if ( attr->a_desc == slap_schema.si_ad_objectClass &&
+						oc_bvfind_undef( &attr->a_vals[i] ) != NULL )
+				{
+					ber_dupbv( &pval, &attr->a_vals[i] );
+
+				} else {
+					attr->a_nvals = NULL;
+					attr_free( attr );
+					goto next_attr;
+				}
 			}
 
 			if ( pretty ) {
@@ -539,7 +548,7 @@ ldap_back_entry_get(
 
 retry:
 	rc = ldap_search_ext_s( lc->lc_ld, ndn->bv_val, LDAP_SCOPE_BASE, filter,
-				gattr, 0, NULL, NULL, LDAP_NO_LIMIT,
+				at ? gattr : NULL, 0, NULL, NULL, LDAP_NO_LIMIT,
 				LDAP_NO_LIMIT, &result );
 	if ( rc != LDAP_SUCCESS ) {
 		if ( rc == LDAP_SERVER_DOWN && do_retry ) {
diff --git a/servers/slapd/oc.c b/servers/slapd/oc.c
index fcefc34449..651041f934 100644
--- a/servers/slapd/oc.c
+++ b/servers/slapd/oc.c
@@ -170,6 +170,47 @@ oc_bvfind( struct berval *ocname )
 	return( NULL );
 }
 
+static LDAP_SLIST_HEAD(OCUList, slap_object_class) oc_undef_list
+	= LDAP_SLIST_HEAD_INITIALIZER(&oc_undef_list);
+
+ObjectClass *
+oc_bvfind_undef( struct berval *ocname )
+{
+	ObjectClass	*oc = oc_bvfind( ocname );
+
+	if ( oc ) {
+		return oc;
+	}
+
+	LDAP_SLIST_FOREACH( oc, &oc_undef_list, soc_next ) {
+		int	d = oc->soc_cname.bv_len - ocname->bv_len;
+
+		if ( d ) {
+			continue;
+		}
+
+		if ( strcasecmp( oc->soc_cname.bv_val, ocname->bv_val ) == 0 ) {
+			break;
+		}
+	}
+	
+	if ( oc ) {
+		return oc;
+	}
+	
+	oc = ch_malloc( sizeof( ObjectClass ) + ocname->bv_len + 1 );
+	memset( oc, 0, sizeof( ObjectClass ) );
+
+	oc->soc_cname.bv_len = ocname->bv_len;
+	oc->soc_cname.bv_val = (char *)&oc[ 1 ];
+	AC_MEMCPY( oc->soc_cname.bv_val, ocname->bv_val, ocname->bv_len );
+
+	LDAP_SLIST_NEXT( oc, soc_next ) = NULL;
+	LDAP_SLIST_INSERT_HEAD( &oc_undef_list, oc, soc_next );
+
+	return oc;
+}
+
 static int
 oc_create_required(
     ObjectClass		*soc,
@@ -337,6 +378,13 @@ oc_destroy( void )
 		if (o->soc_allowed) ldap_memfree(o->soc_allowed);
 		ldap_objectclass_free((LDAPObjectClass *)o);
 	}
+	
+	while( !LDAP_SLIST_EMPTY(&oc_undef_list) ) {
+		o = LDAP_SLIST_FIRST(&oc_undef_list);
+		LDAP_SLIST_REMOVE_HEAD(&oc_undef_list, soc_next);
+
+		ch_free( (ObjectClass *)o );
+	}
 }
 
 static int
diff --git a/servers/slapd/overlays/rwm.c b/servers/slapd/overlays/rwm.c
index 11b4da6635..fc4634703d 100644
--- a/servers/slapd/overlays/rwm.c
+++ b/servers/slapd/overlays/rwm.c
@@ -771,7 +771,9 @@ rwm_attrs( Operation *op, SlapReply *rs, Attribute** a_first )
 			goto cleanup_attr;
 		}
 
-		if ( (*ap)->a_desc->ad_type->sat_no_user_mod ) {
+		if ( (*ap)->a_desc->ad_type->sat_no_user_mod 
+			&& (*ap)->a_desc->ad_type != slap_schema.si_at_undefined )
+		{
 			goto next_attr;
 		}
 
diff --git a/servers/slapd/overlays/rwmconf.c b/servers/slapd/overlays/rwmconf.c
index ba20bc35a7..8ec26196f0 100644
--- a/servers/slapd/overlays/rwmconf.c
+++ b/servers/slapd/overlays/rwmconf.c
@@ -142,10 +142,19 @@ rwm_map_config(
 	"is not defined in schema\n",
 				fname, lineno, dst );
 
+			mapping[0].m_dst_oc = oc_bvfind_undef( &mapping[0].m_dst );
+			if ( mapping[0].m_dst_oc == NULL ) {
+				fprintf( stderr, "%s: line %d: unable to mimic destination objectClass '%s'\n",
+					fname, lineno, dst );
+				return 1;
+			}
+
+#if 0
 			mapping[0].m_dst_oc = ch_malloc( sizeof( ObjectClass ) );
 			memset( mapping[0].m_dst_oc, 0, sizeof( ObjectClass ) );
 			mapping[0].m_dst_oc->soc_cname = mapping[0].m_dst;
 			mapping[0].m_flags |= RWMMAP_F_FREE_DST;
+#endif
 		}
 		mapping[1].m_src_oc = mapping[0].m_dst_oc;
 
diff --git a/servers/slapd/schema_prep.c b/servers/slapd/schema_prep.c
index e81009a57b..ce794edc4a 100644
--- a/servers/slapd/schema_prep.c
+++ b/servers/slapd/schema_prep.c
@@ -1248,7 +1248,7 @@ slap_schema_load( void )
 		}
 	}
 
-	slap_at_undefined.sat_syntax = slap_schema.si_syn_distinguishedName;
+	slap_at_undefined.sat_syntax = slap_schema.si_syn_octetString;
 	slap_schema.si_at_undefined = &slap_at_undefined;
 
 	return LDAP_SUCCESS;
-- 
2.39.5