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 2000-2014 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                 session->ls_count++;
 165         }
 166         ldap_pvt_thread_rdwr_runlock( &info->li_cookies_mutex );
 167 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 168
 169         return session;
 170 }
 171
 172 /*
 173  * Returns a session
 174  */
 175 void
 176 rewrite_session_return(
 177                 struct rewrite_info *info,
 178                 struct rewrite_session *session
 179 )
 180 {
 181         assert( session != NULL );
 182         session->ls_count--;
 183         ldap_pvt_thread_mutex_unlock( &session->ls_mutex );
 184 }
 185
 186 /*
 187  * Defines and inits a var with session scope
 188  */
 189 int
 190 rewrite_session_var_set_f(
 191                 struct rewrite_info *info,
 192                 const void *cookie,
 193                 const char *name,
 194                 const char *value,
 195                 int flags
 196 )
 197 {
 198         struct rewrite_session *session;
 199         struct rewrite_var *var;
 200
 201         assert( info != NULL );
 202         assert( cookie != NULL );
 203         assert( name != NULL );
 204         assert( value != NULL );
 205
 206         session = rewrite_session_find( info, cookie );
 207         if ( session == NULL ) {
 208                 session = rewrite_session_init( info, cookie );
 209                 if ( session == NULL ) {
 210                         return REWRITE_ERR;
 211                 }
 212
 213 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 214                 ldap_pvt_thread_mutex_lock( &session->ls_mutex );
 215 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 216         }
 217
 218 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 219         ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex );
 220 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 221
 222         var = rewrite_var_find( session->ls_vars, name );
 223         if ( var != NULL ) {
 224                 assert( var->lv_value.bv_val != NULL );
 225
 226                 (void)rewrite_var_replace( var, value, flags );
 227
 228         } else {
 229                 var = rewrite_var_insert_f( &session->ls_vars, name, value, flags );
 230                 if ( var == NULL ) {
 231 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 232                         ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
 233 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 234                         rewrite_session_return( info, session );
 235                         return REWRITE_ERR;
 236                 }
 237         }
 238
 239 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 240         ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
 241 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 242
 243         rewrite_session_return( info, session );
 244
 245         return REWRITE_SUCCESS;
 246 }
 247
 248 /*
 249  * Gets a var with session scope
 250  */
 251 int
 252 rewrite_session_var_get(
 253                 struct rewrite_info *info,
 254                 const void *cookie,
 255                 const char *name,
 256                 struct berval *value
 257 )
 258 {
 259         struct rewrite_session *session;
 260         struct rewrite_var *var;
 261         int rc = REWRITE_SUCCESS;
 262
 263         assert( info != NULL );
 264         assert( cookie != NULL );
 265         assert( name != NULL );
 266         assert( value != NULL );
 267
 268         value->bv_val = NULL;
 269         value->bv_len = 0;
 270
 271         if ( cookie == NULL ) {
 272                 return REWRITE_ERR;
 273         }
 274
 275         session = rewrite_session_find( info, cookie );
 276         if ( session == NULL ) {
 277                 return REWRITE_ERR;
 278         }
 279
 280 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 281         ldap_pvt_thread_rdwr_rlock( &session->ls_vars_mutex );
 282 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 283
 284         var = rewrite_var_find( session->ls_vars, name );
 285         if ( var != NULL ) {
 286                 value->bv_val = strdup( var->lv_value.bv_val );
 287                 value->bv_len = var->lv_value.bv_len;
 288         }
 289
 290         if ( var == NULL || value->bv_val == NULL ) {
 291                 rc = REWRITE_ERR;
 292         }
 293
 294 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 295         ldap_pvt_thread_rdwr_runlock( &session->ls_vars_mutex );
 296 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 297
 298         rewrite_session_return( info, session );
 299
 300         return rc;
 301 }
 302
 303 static void
 304 rewrite_session_clean( void *v_session )
 305 {
 306         struct rewrite_session  *session = (struct rewrite_session *)v_session;
 307
 308 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 309         ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex );
 310 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 311
 312         rewrite_var_delete( session->ls_vars );
 313
 314 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 315         ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex );
 316         ldap_pvt_thread_rdwr_destroy( &session->ls_vars_mutex );
 317         ldap_pvt_thread_mutex_unlock( &session->ls_mutex );
 318         ldap_pvt_thread_mutex_destroy( &session->ls_mutex );
 319 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 320 }
 321
 322 static void
 323 rewrite_session_free( void *v_session )
 324 {
 325         struct rewrite_session  *session = (struct rewrite_session *)v_session;
 326
 327         ldap_pvt_thread_mutex_lock( &session->ls_mutex );
 328         rewrite_session_clean( v_session );
 329         free( v_session );
 330 }
 331
 332 /*
 333  * Deletes a session
 334  */
 335 int
 336 rewrite_session_delete(
 337                 struct rewrite_info *info,
 338                 const void *cookie
 339 )
 340 {
 341         struct rewrite_session *session, tmp = { 0 };
 342
 343         assert( info != NULL );
 344         assert( cookie != NULL );
 345
 346         session = rewrite_session_find( info, cookie );
 347
 348         if ( session == NULL ) {
 349                 return REWRITE_SUCCESS;
 350         }
 351
 352         if ( --session->ls_count > 0 ) {
 353                 rewrite_session_return( info, session );
 354                 return REWRITE_SUCCESS;
 355         }
 356
 357         rewrite_session_clean( session );
 358
 359 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 360         ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex );
 361 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 362
 363         assert( info->li_num_cookies > 0 );
 364         info->li_num_cookies--;
 365
 366         /*
 367          * There is nothing to delete in the return value
 368          */
 369         tmp.ls_cookie = ( void * )cookie;
 370         avl_delete( &info->li_cookies, ( caddr_t )&tmp, rewrite_cookie_cmp );
 371
 372         free( session );
 373
 374 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 375         ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
 376 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 377
 378         return REWRITE_SUCCESS;
 379 }
 380
 381 /*
 382  * Destroys the cookie tree
 383  */
 384 int
 385 rewrite_session_destroy(
 386                 struct rewrite_info *info
 387 )
 388 {
 389         int count;
 390
 391         assert( info != NULL );
 392
 393 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 394         ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex );
 395 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 396
 397         /*
 398          * Should call per-session destruction routine ...
 399          */
 400
 401         count = avl_free( info->li_cookies, rewrite_session_free );
 402         info->li_cookies = NULL;
 403
 404 #if 0
 405         fprintf( stderr, "count = %d; num_cookies = %d\n",
 406                         count, info->li_num_cookies );
 407 #endif
 408
 409         assert( count == info->li_num_cookies );
 410         info->li_num_cookies = 0;
 411
 412 #ifdef USE_REWRITE_LDAP_PVT_THREADS
 413         ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex );
 414 #endif /* USE_REWRITE_LDAP_PVT_THREADS */
 415
 416         return REWRITE_SUCCESS;
 417 }
 418