2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4 * Copyright 2003-2004 The OpenLDAP Foundation.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted only as authorized by the OpenLDAP
11 * A copy of this license is available in the file LICENSE in the
12 * top-level directory of the distribution or, alternatively, at
13 * <http://www.OpenLDAP.org/license.html>.
15 /* (C) Copyright PADL Software Pty Ltd. 2003
16 * Redistribution and use in source and binary forms, with or without
17 * modification, are permitted provided that this notice is preserved
18 * and that due credit is given to PADL Software Pty Ltd. This software
19 * is provided ``as is'' without express or implied warranty.
22 * This work was initially developed by Luke Howard for inclusion
23 * in OpenLDAP Software.
28 #include <ac/string.h>
29 #include <ac/stdarg.h>
31 #include <ac/unistd.h>
41 * We only support two types -- connection and operation extensions.
42 * Define more types in slapi.h
46 struct slapi_registered_extension_set {
47 ldap_pvt_thread_mutex_t mutex;
48 struct slapi_registered_extension {
51 slapi_extension_constructor_fnptr *constructors;
52 slapi_extension_destructor_fnptr *destructors;
53 } extensions[SLAPI_X_EXT_MAX];
54 } registered_extensions;
56 /* per-object state */
57 struct slapi_extension_block {
61 static int get_extension_block(int objecttype, void *object, struct slapi_extension_block **eblock, void **parent)
63 switch ((slapi_extension_t) objecttype) {
64 case SLAPI_X_EXT_CONNECTION:
65 *eblock = ((Connection *)object)->c_extensions;
68 case SLAPI_X_EXT_OPERATION:
69 *eblock = ((Operation *)object)->o_extensions;
70 *parent = ((Operation *)object)->o_conn;
77 if ( *eblock == NULL ) {
84 static int map_extension_type(const char *objectname, slapi_extension_t *type)
86 if ( strcasecmp( objectname, SLAPI_EXT_CONNECTION ) == 0 ) {
87 *type = SLAPI_X_EXT_CONNECTION;
88 } else if ( strcasecmp( objectname, SLAPI_EXT_OPERATION ) == 0 ) {
89 *type = SLAPI_X_EXT_OPERATION;
97 static void new_extension(struct slapi_extension_block *eblock,
98 int objecttype, void *object, void *parent,
101 slapi_extension_constructor_fnptr constructor;
103 assert( objecttype < SLAPI_X_EXT_MAX );
104 assert( extensionhandle < registered_extensions.extensions[objecttype].count );
106 assert( registered_extensions.extensions[objecttype].constructors != NULL );
107 constructor = registered_extensions.extensions[objecttype].constructors[extensionhandle];
109 assert( eblock->extensions[extensionhandle] == NULL );
111 if ( constructor != NULL ) {
112 eblock->extensions[extensionhandle] = (*constructor)( object, parent );
114 eblock->extensions[extensionhandle] = NULL;
118 static void free_extension(struct slapi_extension_block *eblock, int objecttype, void *object, void *parent, int extensionhandle )
120 slapi_extension_destructor_fnptr destructor;
122 assert( objecttype < SLAPI_X_EXT_MAX );
123 assert( extensionhandle < registered_extensions.extensions[objecttype].count );
125 if ( eblock->extensions[extensionhandle] != NULL ) {
126 assert( registered_extensions.extensions[objecttype].destructors != NULL );
127 destructor = registered_extensions.extensions[objecttype].destructors[extensionhandle];
128 if ( destructor != NULL ) {
129 (*destructor)( eblock->extensions[extensionhandle], object, parent );
131 eblock->extensions[extensionhandle] = NULL;
134 #endif /* LDAP_SLAPI */
136 void *slapi_get_object_extension(int objecttype, void *object, int extensionhandle)
139 struct slapi_extension_block *eblock;
142 if ( get_extension_block( objecttype, object, &eblock, &parent ) != 0 ) {
146 if ( extensionhandle < registered_extensions.extensions[objecttype].count ) {
147 return eblock->extensions[extensionhandle];
153 #endif /* LDAP_SLAPI */
156 void slapi_set_object_extension(int objecttype, void *object, int extensionhandle, void *extension)
159 struct slapi_extension_block *eblock;
162 if ( get_extension_block( objecttype, object, &eblock, &parent ) != 0 ) {
166 if ( extensionhandle < registered_extensions.extensions[objecttype].count ) {
167 /* free the old one */
168 free_extension( eblock, objecttype, object, parent, extensionhandle );
170 /* constructed by caller */
171 eblock->extensions[extensionhandle] = extension;
173 #endif /* LDAP_SLAPI */
176 int slapi_register_object_extension(
177 const char *pluginname,
178 const char *objectname,
179 slapi_extension_constructor_fnptr constructor,
180 slapi_extension_destructor_fnptr destructor,
182 int *extensionhandle)
186 slapi_extension_t type;
187 struct slapi_registered_extension *re;
189 ldap_pvt_thread_mutex_lock( ®istered_extensions.mutex );
191 rc = map_extension_type( objectname, &type );
193 ldap_pvt_thread_mutex_unlock( ®istered_extensions.mutex );
197 *objecttype = (int)type;
199 re = ®istered_extensions.extensions[*objecttype];
201 *extensionhandle = re->count;
204 /* can't add new extensions after objects have been created */
205 ldap_pvt_thread_mutex_unlock( ®istered_extensions.mutex );
211 if ( re->constructors == NULL ) {
212 re->constructors = (slapi_extension_constructor_fnptr *)slapi_ch_calloc( re->count,
213 sizeof( slapi_extension_constructor_fnptr ) );
215 re->constructors = (slapi_extension_constructor_fnptr *)slapi_ch_realloc( (char *)re->constructors,
216 re->count * sizeof( slapi_extension_constructor_fnptr ) );
218 re->constructors[*extensionhandle] = constructor;
220 if ( re->destructors == NULL ) {
221 re->destructors = (slapi_extension_destructor_fnptr *)slapi_ch_calloc( re->count,
222 sizeof( slapi_extension_destructor_fnptr ) );
224 re->destructors = (slapi_extension_destructor_fnptr *)slapi_ch_realloc( (char *)re->destructors,
225 re->count * sizeof( slapi_extension_destructor_fnptr ) );
227 re->destructors[*extensionhandle] = destructor;
229 ldap_pvt_thread_mutex_unlock( ®istered_extensions.mutex );
234 #endif /* LDAP_SLAPI */
237 int slapi_int_create_object_extensions(int objecttype, void *object)
241 struct slapi_extension_block *eblock;
245 switch ((slapi_extension_t) objecttype) {
246 case SLAPI_X_EXT_CONNECTION:
247 peblock = &(((Connection *)object)->c_extensions);
250 case SLAPI_X_EXT_OPERATION:
251 peblock = &(((Operation *)object)->o_extensions);
252 parent = ((Operation *)object)->o_conn;
261 ldap_pvt_thread_mutex_lock( ®istered_extensions.mutex );
262 if ( registered_extensions.extensions[objecttype].active == 0 ) {
264 * once we've created some extensions, no new extensions can
267 registered_extensions.extensions[objecttype].active = 1;
269 ldap_pvt_thread_mutex_unlock( ®istered_extensions.mutex );
271 eblock = (struct slapi_extension_block *)slapi_ch_calloc( 1, sizeof(*eblock) );
273 if ( registered_extensions.extensions[objecttype].count ) {
274 eblock->extensions = (void **)slapi_ch_calloc( registered_extensions.extensions[objecttype].count, sizeof(void *) );
275 for ( i = 0; i < registered_extensions.extensions[objecttype].count; i++ ) {
276 new_extension( eblock, objecttype, object, parent, i );
279 eblock->extensions = NULL;
290 int slapi_int_free_object_extensions(int objecttype, void *object)
294 struct slapi_extension_block *eblock;
298 switch ((slapi_extension_t) objecttype) {
299 case SLAPI_X_EXT_CONNECTION:
300 peblock = &(((Connection *)object)->c_extensions);
303 case SLAPI_X_EXT_OPERATION:
304 peblock = &(((Operation *)object)->o_extensions);
305 parent = ((Operation *)object)->o_conn;
312 eblock = (struct slapi_extension_block *)*peblock;
314 if ( eblock->extensions != NULL ) {
315 for ( i = registered_extensions.extensions[objecttype].count - 1; i >= 0; --i ) {
316 free_extension( eblock, objecttype, object, parent, i );
319 slapi_ch_free( (void **)&eblock->extensions );
322 slapi_ch_free( peblock );
330 /* for reusable object types */
331 int slapi_int_clear_object_extensions(int objecttype, void *object)
335 struct slapi_extension_block *eblock;
338 if ( get_extension_block( objecttype, object, &eblock, &parent ) != 0 ) {
342 if ( eblock->extensions == NULL ) {
347 for ( i = registered_extensions.extensions[objecttype].count - 1; i >= 0; --i ) {
348 free_extension( eblock, objecttype, object, parent, i );
351 for ( i = 0; i < registered_extensions.extensions[objecttype].count; i++ ) {
352 new_extension( eblock, objecttype, object, parent, i );
361 int slapi_int_init_object_extensions(void)
364 memset( ®istered_extensions, 0, sizeof( registered_extensions ) );
366 if ( ldap_pvt_thread_mutex_init( ®istered_extensions.mutex ) != 0 ) {