1 /* $NetBSD: session.c,v 1.2 2014/05/28 10:14:13 tron Exp $ */ 2 3 /* $OpenLDAP$ */ 4 /* This work is part of OpenLDAP Software <http://www.openldap.org/>. 5 * 6 * Copyright 2000-2014 The OpenLDAP Foundation. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted only as authorized by the OpenLDAP 11 * Public License. 12 * 13 * A copy of this license is available in the file LICENSE in the 14 * top-level directory of the distribution or, alternatively, at 15 * <http://www.OpenLDAP.org/license.html>. 16 */ 17 /* ACKNOWLEDGEMENT: 18 * This work was initially developed by Pierangelo Masarati for 19 * inclusion in OpenLDAP Software. 20 */ 21 22 #include <portable.h> 23 24 #include "rewrite-int.h" 25 26 /* 27 * Compares two cookies 28 */ 29 static int 30 rewrite_cookie_cmp( 31 const void *c1, 32 const void *c2 33 ) 34 { 35 const struct rewrite_session *s1, *s2; 36 37 s1 = ( const struct rewrite_session * )c1; 38 s2 = ( const struct rewrite_session * )c2; 39 40 assert( s1 != NULL ); 41 assert( s2 != NULL ); 42 assert( s1->ls_cookie != NULL ); 43 assert( s2->ls_cookie != NULL ); 44 45 return ( ( s1->ls_cookie < s2->ls_cookie ) ? -1 : 46 ( ( s1->ls_cookie > s2->ls_cookie ) ? 1 : 0 ) ); 47 } 48 49 /* 50 * Duplicate cookies? 51 */ 52 static int 53 rewrite_cookie_dup( 54 void *c1, 55 void *c2 56 ) 57 { 58 struct rewrite_session *s1, *s2; 59 60 s1 = ( struct rewrite_session * )c1; 61 s2 = ( struct rewrite_session * )c2; 62 63 assert( s1 != NULL ); 64 assert( s2 != NULL ); 65 assert( s1->ls_cookie != NULL ); 66 assert( s2->ls_cookie != NULL ); 67 68 assert( s1->ls_cookie != s2->ls_cookie ); 69 70 return ( ( s1->ls_cookie == s2->ls_cookie ) ? -1 : 0 ); 71 } 72 73 /* 74 * Inits a session 75 */ 76 struct rewrite_session * 77 rewrite_session_init( 78 struct rewrite_info *info, 79 const void *cookie 80 ) 81 { 82 struct rewrite_session *session, tmp; 83 int rc; 84 85 assert( info != NULL ); 86 assert( cookie != NULL ); 87 88 #ifdef USE_REWRITE_LDAP_PVT_THREADS 89 ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex ); 90 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 91 92 tmp.ls_cookie = ( void * )cookie; 93 session = ( struct rewrite_session * )avl_find( info->li_cookies, 94 ( caddr_t )&tmp, rewrite_cookie_cmp ); 95 if ( session ) { 96 session->ls_count++; 97 #ifdef USE_REWRITE_LDAP_PVT_THREADS 98 ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); 99 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 100 return session; 101 } 102 103 session = calloc( sizeof( struct rewrite_session ), 1 ); 104 if ( session == NULL ) { 105 return NULL; 106 } 107 session->ls_cookie = ( void * )cookie; 108 session->ls_count = 1; 109 110 #ifdef USE_REWRITE_LDAP_PVT_THREADS 111 if ( ldap_pvt_thread_mutex_init( &session->ls_mutex ) ) { 112 free( session ); 113 return NULL; 114 } 115 if ( ldap_pvt_thread_rdwr_init( &session->ls_vars_mutex ) ) { 116 ldap_pvt_thread_mutex_destroy( &session->ls_mutex ); 117 free( session ); 118 return NULL; 119 } 120 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 121 122 rc = avl_insert( &info->li_cookies, ( caddr_t )session, 123 rewrite_cookie_cmp, rewrite_cookie_dup ); 124 info->li_num_cookies++; 125 126 #ifdef USE_REWRITE_LDAP_PVT_THREADS 127 ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); 128 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 129 130 if ( rc != 0 ) { 131 #ifdef USE_REWRITE_LDAP_PVT_THREADS 132 ldap_pvt_thread_rdwr_destroy( &session->ls_vars_mutex ); 133 ldap_pvt_thread_mutex_destroy( &session->ls_mutex ); 134 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 135 136 free( session ); 137 return NULL; 138 } 139 140 return session; 141 } 142 143 /* 144 * Fetches a session 145 */ 146 struct rewrite_session * 147 rewrite_session_find( 148 struct rewrite_info *info, 149 const void *cookie 150 ) 151 { 152 struct rewrite_session *session, tmp; 153 154 assert( info != NULL ); 155 assert( cookie != NULL ); 156 157 tmp.ls_cookie = ( void * )cookie; 158 #ifdef USE_REWRITE_LDAP_PVT_THREADS 159 ldap_pvt_thread_rdwr_rlock( &info->li_cookies_mutex ); 160 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 161 session = ( struct rewrite_session * )avl_find( info->li_cookies, 162 ( caddr_t )&tmp, rewrite_cookie_cmp ); 163 #ifdef USE_REWRITE_LDAP_PVT_THREADS 164 if ( session ) { 165 ldap_pvt_thread_mutex_lock( &session->ls_mutex ); 166 session->ls_count++; 167 } 168 ldap_pvt_thread_rdwr_runlock( &info->li_cookies_mutex ); 169 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 170 171 return session; 172 } 173 174 /* 175 * Returns a session 176 */ 177 void 178 rewrite_session_return( 179 struct rewrite_info *info, 180 struct rewrite_session *session 181 ) 182 { 183 assert( session != NULL ); 184 session->ls_count--; 185 ldap_pvt_thread_mutex_unlock( &session->ls_mutex ); 186 } 187 188 /* 189 * Defines and inits a var with session scope 190 */ 191 int 192 rewrite_session_var_set_f( 193 struct rewrite_info *info, 194 const void *cookie, 195 const char *name, 196 const char *value, 197 int flags 198 ) 199 { 200 struct rewrite_session *session; 201 struct rewrite_var *var; 202 203 assert( info != NULL ); 204 assert( cookie != NULL ); 205 assert( name != NULL ); 206 assert( value != NULL ); 207 208 session = rewrite_session_find( info, cookie ); 209 if ( session == NULL ) { 210 session = rewrite_session_init( info, cookie ); 211 if ( session == NULL ) { 212 return REWRITE_ERR; 213 } 214 215 #ifdef USE_REWRITE_LDAP_PVT_THREADS 216 ldap_pvt_thread_mutex_lock( &session->ls_mutex ); 217 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 218 } 219 220 #ifdef USE_REWRITE_LDAP_PVT_THREADS 221 ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex ); 222 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 223 224 var = rewrite_var_find( session->ls_vars, name ); 225 if ( var != NULL ) { 226 assert( var->lv_value.bv_val != NULL ); 227 228 (void)rewrite_var_replace( var, value, flags ); 229 230 } else { 231 var = rewrite_var_insert_f( &session->ls_vars, name, value, flags ); 232 if ( var == NULL ) { 233 #ifdef USE_REWRITE_LDAP_PVT_THREADS 234 ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex ); 235 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 236 rewrite_session_return( info, session ); 237 return REWRITE_ERR; 238 } 239 } 240 241 #ifdef USE_REWRITE_LDAP_PVT_THREADS 242 ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex ); 243 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 244 245 rewrite_session_return( info, session ); 246 247 return REWRITE_SUCCESS; 248 } 249 250 /* 251 * Gets a var with session scope 252 */ 253 int 254 rewrite_session_var_get( 255 struct rewrite_info *info, 256 const void *cookie, 257 const char *name, 258 struct berval *value 259 ) 260 { 261 struct rewrite_session *session; 262 struct rewrite_var *var; 263 int rc = REWRITE_SUCCESS; 264 265 assert( info != NULL ); 266 assert( cookie != NULL ); 267 assert( name != NULL ); 268 assert( value != NULL ); 269 270 value->bv_val = NULL; 271 value->bv_len = 0; 272 273 if ( cookie == NULL ) { 274 return REWRITE_ERR; 275 } 276 277 session = rewrite_session_find( info, cookie ); 278 if ( session == NULL ) { 279 return REWRITE_ERR; 280 } 281 282 #ifdef USE_REWRITE_LDAP_PVT_THREADS 283 ldap_pvt_thread_rdwr_rlock( &session->ls_vars_mutex ); 284 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 285 286 var = rewrite_var_find( session->ls_vars, name ); 287 if ( var != NULL ) { 288 value->bv_val = strdup( var->lv_value.bv_val ); 289 value->bv_len = var->lv_value.bv_len; 290 } 291 292 if ( var == NULL || value->bv_val == NULL ) { 293 rc = REWRITE_ERR; 294 } 295 296 #ifdef USE_REWRITE_LDAP_PVT_THREADS 297 ldap_pvt_thread_rdwr_runlock( &session->ls_vars_mutex ); 298 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 299 300 rewrite_session_return( info, session ); 301 302 return rc; 303 } 304 305 static void 306 rewrite_session_clean( void *v_session ) 307 { 308 struct rewrite_session *session = (struct rewrite_session *)v_session; 309 310 #ifdef USE_REWRITE_LDAP_PVT_THREADS 311 ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex ); 312 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 313 314 rewrite_var_delete( session->ls_vars ); 315 316 #ifdef USE_REWRITE_LDAP_PVT_THREADS 317 ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex ); 318 ldap_pvt_thread_rdwr_destroy( &session->ls_vars_mutex ); 319 ldap_pvt_thread_mutex_unlock( &session->ls_mutex ); 320 ldap_pvt_thread_mutex_destroy( &session->ls_mutex ); 321 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 322 } 323 324 static void 325 rewrite_session_free( void *v_session ) 326 { 327 struct rewrite_session *session = (struct rewrite_session *)v_session; 328 329 ldap_pvt_thread_mutex_lock( &session->ls_mutex ); 330 rewrite_session_clean( v_session ); 331 free( v_session ); 332 } 333 334 /* 335 * Deletes a session 336 */ 337 int 338 rewrite_session_delete( 339 struct rewrite_info *info, 340 const void *cookie 341 ) 342 { 343 struct rewrite_session *session, tmp = { 0 }; 344 345 assert( info != NULL ); 346 assert( cookie != NULL ); 347 348 session = rewrite_session_find( info, cookie ); 349 350 if ( session == NULL ) { 351 return REWRITE_SUCCESS; 352 } 353 354 if ( --session->ls_count > 0 ) { 355 rewrite_session_return( info, session ); 356 return REWRITE_SUCCESS; 357 } 358 359 rewrite_session_clean( session ); 360 361 #ifdef USE_REWRITE_LDAP_PVT_THREADS 362 ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex ); 363 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 364 365 assert( info->li_num_cookies > 0 ); 366 info->li_num_cookies--; 367 368 /* 369 * There is nothing to delete in the return value 370 */ 371 tmp.ls_cookie = ( void * )cookie; 372 avl_delete( &info->li_cookies, ( caddr_t )&tmp, rewrite_cookie_cmp ); 373 374 free( session ); 375 376 #ifdef USE_REWRITE_LDAP_PVT_THREADS 377 ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); 378 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 379 380 return REWRITE_SUCCESS; 381 } 382 383 /* 384 * Destroys the cookie tree 385 */ 386 int 387 rewrite_session_destroy( 388 struct rewrite_info *info 389 ) 390 { 391 int count; 392 393 assert( info != NULL ); 394 395 #ifdef USE_REWRITE_LDAP_PVT_THREADS 396 ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex ); 397 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 398 399 /* 400 * Should call per-session destruction routine ... 401 */ 402 403 count = avl_free( info->li_cookies, rewrite_session_free ); 404 info->li_cookies = NULL; 405 406 #if 0 407 fprintf( stderr, "count = %d; num_cookies = %d\n", 408 count, info->li_num_cookies ); 409 #endif 410 411 assert( count == info->li_num_cookies ); 412 info->li_num_cookies = 0; 413 414 #ifdef USE_REWRITE_LDAP_PVT_THREADS 415 ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); 416 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 417 418 return REWRITE_SUCCESS; 419 } 420 421