1 /* $NetBSD: session.c,v 1.6 2020/08/11 13:15:39 christos Exp $ */ 2 3 /* $OpenLDAP$ */ 4 /* This work is part of OpenLDAP Software <http://www.openldap.org/>. 5 * 6 * Copyright 2000-2020 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 #ifdef USE_REWRITE_LDAP_PVT_THREADS 106 ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); 107 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 108 return NULL; 109 } 110 session->ls_cookie = ( void * )cookie; 111 session->ls_count = 1; 112 113 #ifdef USE_REWRITE_LDAP_PVT_THREADS 114 if ( ldap_pvt_thread_mutex_init( &session->ls_mutex ) ) { 115 free( session ); 116 ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); 117 return NULL; 118 } 119 if ( ldap_pvt_thread_rdwr_init( &session->ls_vars_mutex ) ) { 120 ldap_pvt_thread_mutex_destroy( &session->ls_mutex ); 121 free( session ); 122 ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); 123 return NULL; 124 } 125 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 126 127 rc = avl_insert( &info->li_cookies, ( caddr_t )session, 128 rewrite_cookie_cmp, rewrite_cookie_dup ); 129 info->li_num_cookies++; 130 131 #ifdef USE_REWRITE_LDAP_PVT_THREADS 132 ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); 133 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 134 135 if ( rc != 0 ) { 136 #ifdef USE_REWRITE_LDAP_PVT_THREADS 137 ldap_pvt_thread_rdwr_destroy( &session->ls_vars_mutex ); 138 ldap_pvt_thread_mutex_destroy( &session->ls_mutex ); 139 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 140 141 free( session ); 142 return NULL; 143 } 144 145 return session; 146 } 147 148 /* 149 * Fetches a session 150 */ 151 struct rewrite_session * 152 rewrite_session_find( 153 struct rewrite_info *info, 154 const void *cookie 155 ) 156 { 157 struct rewrite_session *session, tmp; 158 159 assert( info != NULL ); 160 assert( cookie != NULL ); 161 162 tmp.ls_cookie = ( void * )cookie; 163 #ifdef USE_REWRITE_LDAP_PVT_THREADS 164 ldap_pvt_thread_rdwr_rlock( &info->li_cookies_mutex ); 165 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 166 session = ( struct rewrite_session * )avl_find( info->li_cookies, 167 ( caddr_t )&tmp, rewrite_cookie_cmp ); 168 #ifdef USE_REWRITE_LDAP_PVT_THREADS 169 if ( session ) { 170 ldap_pvt_thread_mutex_lock( &session->ls_mutex ); 171 session->ls_count++; 172 } 173 ldap_pvt_thread_rdwr_runlock( &info->li_cookies_mutex ); 174 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 175 176 return session; 177 } 178 179 /* 180 * Returns a session 181 */ 182 void 183 rewrite_session_return( 184 struct rewrite_info *info, 185 struct rewrite_session *session 186 ) 187 { 188 assert( session != NULL ); 189 session->ls_count--; 190 ldap_pvt_thread_mutex_unlock( &session->ls_mutex ); 191 } 192 193 /* 194 * Defines and inits a var with session scope 195 */ 196 int 197 rewrite_session_var_set_f( 198 struct rewrite_info *info, 199 const void *cookie, 200 const char *name, 201 const char *value, 202 int flags 203 ) 204 { 205 struct rewrite_session *session; 206 struct rewrite_var *var; 207 208 assert( info != NULL ); 209 assert( cookie != NULL ); 210 assert( name != NULL ); 211 assert( value != NULL ); 212 213 session = rewrite_session_find( info, cookie ); 214 if ( session == NULL ) { 215 session = rewrite_session_init( info, cookie ); 216 if ( session == NULL ) { 217 return REWRITE_ERR; 218 } 219 220 #ifdef USE_REWRITE_LDAP_PVT_THREADS 221 ldap_pvt_thread_mutex_lock( &session->ls_mutex ); 222 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 223 } 224 225 #ifdef USE_REWRITE_LDAP_PVT_THREADS 226 ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex ); 227 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 228 229 var = rewrite_var_find( session->ls_vars, name ); 230 if ( var != NULL ) { 231 assert( var->lv_value.bv_val != NULL ); 232 233 (void)rewrite_var_replace( var, value, flags ); 234 235 } else { 236 var = rewrite_var_insert_f( &session->ls_vars, name, value, flags ); 237 if ( var == NULL ) { 238 #ifdef USE_REWRITE_LDAP_PVT_THREADS 239 ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex ); 240 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 241 rewrite_session_return( info, session ); 242 return REWRITE_ERR; 243 } 244 } 245 246 #ifdef USE_REWRITE_LDAP_PVT_THREADS 247 ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex ); 248 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 249 250 rewrite_session_return( info, session ); 251 252 return REWRITE_SUCCESS; 253 } 254 255 /* 256 * Gets a var with session scope 257 */ 258 int 259 rewrite_session_var_get( 260 struct rewrite_info *info, 261 const void *cookie, 262 const char *name, 263 struct berval *value 264 ) 265 { 266 struct rewrite_session *session; 267 struct rewrite_var *var; 268 int rc = REWRITE_SUCCESS; 269 270 assert( info != NULL ); 271 assert( cookie != NULL ); 272 assert( name != NULL ); 273 assert( value != NULL ); 274 275 value->bv_val = NULL; 276 value->bv_len = 0; 277 278 if ( cookie == NULL ) { 279 return REWRITE_ERR; 280 } 281 282 session = rewrite_session_find( info, cookie ); 283 if ( session == NULL ) { 284 return REWRITE_ERR; 285 } 286 287 #ifdef USE_REWRITE_LDAP_PVT_THREADS 288 ldap_pvt_thread_rdwr_rlock( &session->ls_vars_mutex ); 289 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 290 291 var = rewrite_var_find( session->ls_vars, name ); 292 if ( var != NULL ) { 293 value->bv_val = strdup( var->lv_value.bv_val ); 294 value->bv_len = var->lv_value.bv_len; 295 } 296 297 if ( var == NULL || value->bv_val == NULL ) { 298 rc = REWRITE_ERR; 299 } 300 301 #ifdef USE_REWRITE_LDAP_PVT_THREADS 302 ldap_pvt_thread_rdwr_runlock( &session->ls_vars_mutex ); 303 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 304 305 rewrite_session_return( info, session ); 306 307 return rc; 308 } 309 310 static void 311 rewrite_session_clean( void *v_session ) 312 { 313 struct rewrite_session *session = (struct rewrite_session *)v_session; 314 315 #ifdef USE_REWRITE_LDAP_PVT_THREADS 316 ldap_pvt_thread_rdwr_wlock( &session->ls_vars_mutex ); 317 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 318 319 rewrite_var_delete( session->ls_vars ); 320 321 #ifdef USE_REWRITE_LDAP_PVT_THREADS 322 ldap_pvt_thread_rdwr_wunlock( &session->ls_vars_mutex ); 323 ldap_pvt_thread_rdwr_destroy( &session->ls_vars_mutex ); 324 ldap_pvt_thread_mutex_unlock( &session->ls_mutex ); 325 ldap_pvt_thread_mutex_destroy( &session->ls_mutex ); 326 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 327 } 328 329 static void 330 rewrite_session_free( void *v_session ) 331 { 332 struct rewrite_session *session = (struct rewrite_session *)v_session; 333 334 ldap_pvt_thread_mutex_lock( &session->ls_mutex ); 335 rewrite_session_clean( v_session ); 336 free( v_session ); 337 } 338 339 /* 340 * Deletes a session 341 */ 342 int 343 rewrite_session_delete( 344 struct rewrite_info *info, 345 const void *cookie 346 ) 347 { 348 struct rewrite_session *session, tmp = { 0 }; 349 350 assert( info != NULL ); 351 assert( cookie != NULL ); 352 353 session = rewrite_session_find( info, cookie ); 354 355 if ( session == NULL ) { 356 return REWRITE_SUCCESS; 357 } 358 359 if ( --session->ls_count > 0 ) { 360 rewrite_session_return( info, session ); 361 return REWRITE_SUCCESS; 362 } 363 364 rewrite_session_clean( session ); 365 366 #ifdef USE_REWRITE_LDAP_PVT_THREADS 367 ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex ); 368 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 369 370 assert( info->li_num_cookies > 0 ); 371 info->li_num_cookies--; 372 373 /* 374 * There is nothing to delete in the return value 375 */ 376 tmp.ls_cookie = ( void * )cookie; 377 avl_delete( &info->li_cookies, ( caddr_t )&tmp, rewrite_cookie_cmp ); 378 379 free( session ); 380 381 #ifdef USE_REWRITE_LDAP_PVT_THREADS 382 ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); 383 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 384 385 return REWRITE_SUCCESS; 386 } 387 388 /* 389 * Destroys the cookie tree 390 */ 391 int 392 rewrite_session_destroy( 393 struct rewrite_info *info 394 ) 395 { 396 int count; 397 398 assert( info != NULL ); 399 400 #ifdef USE_REWRITE_LDAP_PVT_THREADS 401 ldap_pvt_thread_rdwr_wlock( &info->li_cookies_mutex ); 402 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 403 404 /* 405 * Should call per-session destruction routine ... 406 */ 407 408 count = avl_free( info->li_cookies, rewrite_session_free ); 409 info->li_cookies = NULL; 410 411 #if 0 412 fprintf( stderr, "count = %d; num_cookies = %d\n", 413 count, info->li_num_cookies ); 414 #endif 415 416 assert( count == info->li_num_cookies ); 417 info->li_num_cookies = 0; 418 419 #ifdef USE_REWRITE_LDAP_PVT_THREADS 420 ldap_pvt_thread_rdwr_wunlock( &info->li_cookies_mutex ); 421 #endif /* USE_REWRITE_LDAP_PVT_THREADS */ 422 423 return REWRITE_SUCCESS; 424 } 425 426