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diff --git a/servers/slapd/overlays/rwm.h b/servers/slapd/overlays/rwm.h
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+/* rwm.h - dn rewrite/attribute mapping header file */
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 1999-2021 The OpenLDAP Foundation.
+ * Portions Copyright 1999-2003 Howard Chu.
+ * Portions Copyright 2000-2003 Pierangelo Masarati.
+ * 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>.
+ */
+/* ACKNOWLEDGEMENTS:
+ * This work was initially developed by the Howard Chu for inclusion
+ * in OpenLDAP Software and subsequently enhanced by Pierangelo
+ * Masarati.
+ */
+
+#ifndef RWM_H
+#define RWM_H
+
+#ifndef ENABLE_REWRITE
+#error "librewrite must be enabled!"
+#endif /* ENABLE_REWRITE */
+
+/* String rewrite library */
+#include "rewrite.h"
+
+LDAP_BEGIN_DECL
+
+/* define to enable referral DN massage by default */
+#undef RWM_REFERRAL_REWRITE
+
+struct ldapmap {
+ int drop_missing;
+
+ Avlnode *map;
+ Avlnode *remap;
+};
+
+struct ldapmapping {
+ int m_flags;
+#define RWMMAP_F_NONE 0x00
+#define RWMMAP_F_IS_OC 0x01
+#define RWMMAP_F_FREE_SRC 0x10
+#define RWMMAP_F_FREE_DST 0x20
+ struct berval m_src;
+ union {
+ AttributeDescription *m_s_ad;
+ ObjectClass *m_s_oc;
+ } m_src_ref;
+#define m_src_ad m_src_ref.m_s_ad
+#define m_src_oc m_src_ref.m_s_oc
+ struct berval m_dst;
+ union {
+ AttributeDescription *m_d_ad;
+ ObjectClass *m_d_oc;
+ } m_dst_ref;
+#define m_dst_ad m_dst_ref.m_d_ad
+#define m_dst_oc m_dst_ref.m_d_oc
+};
+
+struct ldaprwmap {
+ /*
+ * DN rewriting
+ */
+ struct rewrite_info *rwm_rw;
+ BerVarray rwm_bva_rewrite;
+
+ /*
+ * Attribute/objectClass mapping
+ */
+ struct ldapmap rwm_oc;
+ struct ldapmap rwm_at;
+ BerVarray rwm_bva_map;
+
+#define RWM_F_NONE (0x0000U)
+#define RWM_F_NORMALIZE_MAPPED_ATTRS (0x0001U)
+#define RWM_F_DROP_UNREQUESTED_ATTRS (0x0002U)
+#define RWM_F_SUPPORT_T_F (0x4000U)
+#define RWM_F_SUPPORT_T_F_DISCOVER (0x8000U)
+#define RWM_F_SUPPORT_T_F_MASK (RWM_F_SUPPORT_T_F)
+#define RWM_F_SUPPORT_T_F_MASK2 (RWM_F_SUPPORT_T_F|RWM_F_SUPPORT_T_F_DISCOVER)
+ unsigned rwm_flags;
+};
+
+/* Whatever context ldap_back_dn_massage needs... */
+typedef struct dncookie {
+ struct ldaprwmap *rwmap;
+
+ Connection *conn;
+ char *ctx;
+ SlapReply *rs;
+} dncookie;
+
+int rwm_dn_massage( dncookie *dc, struct berval *in, struct berval *dn );
+int rwm_dn_massage_pretty( dncookie *dc, struct berval *in, struct berval *pdn );
+int rwm_dn_massage_normalize( dncookie *dc, struct berval *in, struct berval *ndn );
+int rwm_dn_massage_pretty_normalize( dncookie *dc, struct berval *in, struct berval *pdn, struct berval *ndn );
+
+/* attributeType/objectClass mapping */
+int rwm_mapping_cmp (const void *, const void *);
+int rwm_mapping_dup (void *, void *);
+
+int rwm_map_init ( struct ldapmap *lm, struct ldapmapping ** );
+void rwm_map ( struct ldapmap *map, struct berval *s, struct berval *m,
+ int remap );
+int rwm_mapping ( struct ldapmap *map, struct berval *s,
+ struct ldapmapping **m, int remap );
+#define RWM_MAP 0
+#define RWM_REMAP 1
+char *
+rwm_map_filter(
+ struct ldapmap *at_map,
+ struct ldapmap *oc_map,
+ struct berval *f );
+
+#if 0 /* unused! */
+int
+rwm_map_attrs(
+ struct ldapmap *at_map,
+ AttributeName *a,
+ int remap,
+ char ***mapped_attrs );
+#endif
+
+int
+rwm_map_attrnames(
+ Operation *op,
+ struct ldapmap *at_map,
+ struct ldapmap *oc_map,
+ AttributeName *an,
+ AttributeName **anp,
+ int remap );
+
+extern void rwm_mapping_dst_free ( void *mapping );
+
+extern void rwm_mapping_free ( void *mapping );
+
+extern int rwm_map_config(
+ struct ldapmap *oc_map,
+ struct ldapmap *at_map,
+ const char *fname,
+ int lineno,
+ int argc,
+ char **argv );
+
+extern int
+rwm_filter_map_rewrite(
+ Operation *op,
+ dncookie *dc,
+ Filter *f,
+ struct berval *fstr );
+
+/* suffix massaging by means of librewrite */
+extern int
+rwm_suffix_massage_config(
+ struct rewrite_info *info,
+ struct berval *pvnc,
+ struct berval *nvnc,
+ struct berval *prnc,
+ struct berval *nrnc);
+extern int
+rwm_dnattr_rewrite(
+ Operation *op,
+ SlapReply *rs,
+ void *cookie,
+ BerVarray a_vals,
+ BerVarray *pa_nvals );
+extern int
+rwm_referral_rewrite(
+ Operation *op,
+ SlapReply *rs,
+ void *cookie,
+ BerVarray a_vals,
+ BerVarray *pa_nvals );
+extern int rwm_dnattr_result_rewrite( dncookie *dc, BerVarray a_vals, BerVarray a_nvals );
+extern int rwm_referral_result_rewrite( dncookie *dc, BerVarray a_vals );
+
+LDAP_END_DECL
+
+#endif /* RWM_H */