git.sur5r.net Git - openldap/blob - libraries/librewrite/session.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 2000-2004 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  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>.
  14  */
  15 /* ACKNOWLEDGEMENT:
  16  * This work was initially developed by Pierangelo Masarati for
  17  * inclusion in OpenLDAP Software.
  18  */
  19
  20 #include <portable.h>
  21
  22 #include "rewrite-int.h"
  23
  24 /*
  25  * Compares two cookies
  26  */
  27 static int
  28 rewrite_cookie_cmp(
  29                 const void *c1,
  30                 const void *c2
  31 )
  32 {
  33         const struct rewrite_session *s1, *s2;
  34
  35         s1 = ( const struct rewrite_session * )c1;
  36         s2 = ( const struct rewrite_session * )c2;
  37
  38         assert( s1 != NULL );
  39         assert( s2 != NULL );
  40         assert( s1->ls_cookie != NULL );
  41         assert( s2->ls_cookie != NULL );
  42
  43         return ( ( s1->ls_cookie < s2->ls_cookie ) ? -1 :
  44                         ( ( s1->ls_cookie > s2->ls_cookie ) ? 1 : 0 ) );
  45 }
  46
  47 /*
  48  * Duplicate cookies?
  49  */
  50 static int
  51 rewrite_cookie_dup(
  52                 void *c1,
  53                 void *c2
  54 )
  55 {
  56         struct rewrite_session *s1, *s2;
  57
  58         s1 = ( struct rewrite_session * )c1;
  59         s2 = ( struct rewrite_session * )c2;
  60
  61         assert( s1 != NULL );
  62         assert( s2 != NULL );
  63         assert( s1->ls_cookie != NULL );
  64         assert( s2->ls_cookie != NULL );
  65
  66         assert( s1->ls_cookie != s2->ls_cookie );
  67
  68         return ( ( s1->ls_cookie == s2->ls_cookie ) ? -1 : 0 );
  69 }
  70
  71 /*
  72  * Inits a session
  73  */
  74 struct rewrite_session *
  75 rewrite_session_init(
  76                 struct rewrite_info *info,
  77                 const void *cookie
  78 )
  79 {
  80         struct rewrite_session  *session, tmp;
  81         int                     rc;
  82
  83         assert( info != NULL );
  84         assert( cookie != NULL );
  85
  86 #ifdef USE_REWRITE_LDAP_PVT_THREADS
  87         ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex );
  88 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
  89
  90         tmp.ls_cookie = ( void * )cookie;
  91         session = ( struct rewrite_session * )avl_find( info->li_cookies,
  92                         ( caddr_t )&tmp, rewrite_cookie_cmp );
  93         if ( session ) {
  94                 session->ls_count++;
  95 #ifdef USE_REWRITE_LDAP_PVT_THREADS
  96                 ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
  97 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
  98                 return session;
  99         }
 100
 101         session = calloc( sizeof( struct rewrite_session ), 1 );
 102         if ( session == NULL ) {
 103                 return NULL;
 104         }
 105         session->ls_cookie = ( void * )cookie;
 106         session->ls_count = 1;
 107
 108 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 109         if ( ldap_pvt_thread_mutex_init( &session->ls_mutex ) ) {
 110                 free( session );
 111                 return NULL;
 112         }
 113         if ( ldap_pvt_thread_rdwr_init( &session->ls_vars_mutex ) ) {
 114                 ldap_pvt_thread_mutex_destroy( &session->ls_mutex );
 115                 free( session );
 116                 return NULL;
 117         }
 118 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 119
 120         rc = avl_insert( &info->li_cookies, ( caddr_t )session,
 121                         rewrite_cookie_cmp, rewrite_cookie_dup );
 122         info->li_num_cookies++;
 123
 124 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 125         ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
 126 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 127
 128         if ( rc != 0 ) {
 129 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 130                 ldap_pvt_thread_rdwr_destroy( &session->ls_vars_mutex );
 131                 ldap_pvt_thread_mutex_destroy( &session->ls_mutex );
 132 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 133
 134                 free( session );
 135                 return NULL;
 136         }
 137
 138         return session;
 139 }
 140
 141 /*
 142  * Fetches a session
 143  */
 144 struct rewrite_session *
 145 rewrite_session_find(
 146                 struct rewrite_info *info,
 147                 const void *cookie
 148 )
 149 {
 150         struct rewrite_session *session, tmp;
 151
 152         assert( info != NULL );
 153         assert( cookie != NULL );
 154
 155         tmp.ls_cookie = ( void * )cookie;
 156 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 157         ldap_pvt_thread_rdwr_rlock( &info->li_cookies_mutex );
 158 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 159         session = ( struct rewrite_session * )avl_find( info->li_cookies,
 160                         ( caddr_t )&tmp, rewrite_cookie_cmp );
 161 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 162         if ( session ) {
 163                 ldap_pvt_thread_mutex_lock( &session->ls_mutex );
 164         }
 165         ldap_pvt_thread_rdwr_runlock( &info->li_cookies_mutex );
 166 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 167
 168         return session;
 169 }
 170
 171 /*
 172  * Returns a session
 173  */
 174 void
 175 rewrite_session_return(
 176                 struct rewrite_info *info,
 177                 struct rewrite_session *session
 178 )
 179 {
 180         assert( session );
 181         ldap_pvt_thread_mutex_unlock( &session->ls_mutex );
 182 }
 183
 184 /*
 185  * Defines and inits a var with session scope
 186  */
 187 int
 188 rewrite_session_var_set(
 189                 struct rewrite_info *info,
 190                 const void *cookie,
 191                 const char *name,
 192                 const char *value
 193 )
 194 {
 195         struct rewrite_session *session;
 196         struct rewrite_var *var;
 197
 198         assert( info != NULL );
 199         assert( cookie != NULL );
 200         assert( name != NULL );
 201         assert( value != NULL );
 202
 203         session = rewrite_session_find( info, cookie );
 204         if ( session == NULL ) {
 205                 session = rewrite_session_init( info, cookie );
 206         }
 207
 208 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 209         ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex );
 210 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 211
 212         var = rewrite_var_find( session->ls_vars, name );
 213         if ( var != NULL ) {
 214                 assert( var->lv_value.bv_val != NULL );
 215                 free( var->lv_value.bv_val );
 216                 var->lv_value.bv_val = strdup( value );
 217                 var->lv_value.bv_len = strlen( value );
 218         } else {
 219                 var = rewrite_var_insert( &session->ls_vars, name, value );
 220                 if ( var == NULL ) {
 221 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 222                         ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
 223 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 224                         rewrite_session_return( info, session );
 225                         return REWRITE_ERR;
 226                 }
 227         }
 228
 229 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 230         ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
 231 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 232
 233         rewrite_session_return( info, session );
 234
 235         return REWRITE_SUCCESS;
 236 }
 237
 238 /*
 239  * Gets a var with session scope
 240  */
 241 int
 242 rewrite_session_var_get(
 243                 struct rewrite_info *info,
 244                 const void *cookie,
 245                 const char *name,
 246                 struct berval *value
 247 )
 248 {
 249         struct rewrite_session *session;
 250         struct rewrite_var *var;
 251
 252         assert( info != NULL );
 253         assert( cookie != NULL );
 254         assert( name != NULL );
 255         assert( value != NULL );
 256
 257         value->bv_val = NULL;
 258         value->bv_len = 0;
 259
 260         if ( cookie == NULL ) {
 261                 return REWRITE_ERR;
 262         }
 263
 264         session = rewrite_session_find( info, cookie );
 265         if ( session == NULL ) {
 266                 return REWRITE_ERR;
 267         }
 268
 269 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 270         ldap_pvt_thread_rdwr_rlock( &session->ls_vars_mutex );
 271 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 272
 273         var = rewrite_var_find( session->ls_vars, name );
 274         if ( var == NULL ) {
 275
 276 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 277                 ldap_pvt_thread_rdwr_runlock( &session->ls_vars_mutex );
 278 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 279
 280                 rewrite_session_return( info, session );
 281
 282                 return REWRITE_ERR;
 283         } else {
 284                 value->bv_val = strdup( var->lv_value.bv_val );
 285                 value->bv_len = var->lv_value.bv_len;
 286         }
 287
 288 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 289         ldap_pvt_thread_rdwr_runlock( &session->ls_vars_mutex );
 290 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 291
 292         rewrite_session_return( info, session );
 293
 294         return REWRITE_SUCCESS;
 295 }
 296
 297 /*
 298  * Deletes a session
 299  */
 300 int
 301 rewrite_session_delete(
 302                 struct rewrite_info *info,
 303                 const void *cookie
 304 )
 305 {
 306         struct rewrite_session *session, tmp;
 307
 308         assert( info != NULL );
 309         assert( cookie != NULL );
 310
 311         tmp.ls_cookie = ( void * )cookie;
 312
 313         session = rewrite_session_find( info, cookie );
 314
 315         if ( session == NULL ) {
 316                 return REWRITE_SUCCESS;
 317         }
 318
 319         if ( --session->ls_count > 0 ) {
 320                 rewrite_session_return( info, session );
 321                 return REWRITE_SUCCESS;
 322         }
 323
 324 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 325         ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex );
 326 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 327
 328         rewrite_var_delete( session->ls_vars );
 329
 330 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 331         ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
 332         ldap_pvt_thread_rdwr_destroy( &session->ls_vars_mutex );
 333         ldap_pvt_thread_mutex_unlock( &session->ls_mutex );
 334         ldap_pvt_thread_mutex_destroy( &session->ls_mutex );
 335 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 336
 337 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 338         ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex );
 339 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 340
 341         assert( info->li_num_cookies > 0 );
 342         info->li_num_cookies--;
 343
 344         /*
 345          * There is nothing to delete in the return value
 346          */
 347         avl_delete( &info->li_cookies, ( caddr_t )&tmp, rewrite_cookie_cmp );
 348         free( session );
 349
 350 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 351         ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
 352 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 353
 354         return REWRITE_SUCCESS;
 355 }
 356
 357 /*
 358  * Destroys the cookie tree
 359  */
 360 int
 361 rewrite_session_destroy(
 362                 struct rewrite_info *info
 363 )
 364 {
 365         int count;
 366
 367         assert( info != NULL );
 368
 369 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 370         ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex );
 371 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 372
 373         /*
 374          * Should call per-session destruction routine ...
 375          */
 376
 377         count = avl_free( info->li_cookies, NULL );
 378         info->li_cookies = NULL;
 379
 380 #if 0
 381         fprintf( stderr, "count = %d; num_cookies = %d\n",
 382                         count, info->li_num_cookies );
 383 #endif
 384
 385         assert( count == info->li_num_cookies );
 386         info->li_num_cookies = 0;
 387
 388 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 389         ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
 390 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 391
 392         return REWRITE_SUCCESS;
 393 }
 394