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Annotation of embedaddon/curl/lib/psl.c, revision 1.1.1.1

1.1       misho       1: /***************************************************************************
                      2:  *                                  _   _ ____  _
                      3:  *  Project                     ___| | | |  _ \| |
                      4:  *                             / __| | | | |_) | |
                      5:  *                            | (__| |_| |  _ <| |___
                      6:  *                             \___|\___/|_| \_\_____|
                      7:  *
                      8:  * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
                      9:  *
                     10:  * This software is licensed as described in the file COPYING, which
                     11:  * you should have received as part of this distribution. The terms
                     12:  * are also available at https://curl.haxx.se/docs/copyright.html.
                     13:  *
                     14:  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
                     15:  * copies of the Software, and permit persons to whom the Software is
                     16:  * furnished to do so, under the terms of the COPYING file.
                     17:  *
                     18:  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
                     19:  * KIND, either express or implied.
                     20:  *
                     21:  ***************************************************************************/
                     22: 
                     23: #include "curl_setup.h"
                     24: 
                     25: #include <curl/curl.h>
                     26: 
                     27: #ifdef USE_LIBPSL
                     28: 
                     29: #include "psl.h"
                     30: #include "share.h"
                     31: 
                     32: /* The last 3 #include files should be in this order */
                     33: #include "curl_printf.h"
                     34: #include "curl_memory.h"
                     35: #include "memdebug.h"
                     36: 
                     37: void Curl_psl_destroy(struct PslCache *pslcache)
                     38: {
                     39:   if(pslcache->psl) {
                     40:     if(pslcache->dynamic)
                     41:       psl_free((psl_ctx_t *) pslcache->psl);
                     42:     pslcache->psl = NULL;
                     43:     pslcache->dynamic = FALSE;
                     44:   }
                     45: }
                     46: 
                     47: static time_t now_seconds(void)
                     48: {
                     49:   struct curltime now = Curl_now();
                     50: 
                     51:   return now.tv_sec;
                     52: }
                     53: 
                     54: const psl_ctx_t *Curl_psl_use(struct Curl_easy *easy)
                     55: {
                     56:   struct PslCache *pslcache = easy->psl;
                     57:   const psl_ctx_t *psl;
                     58:   time_t now;
                     59: 
                     60:   if(!pslcache)
                     61:     return NULL;
                     62: 
                     63:   Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SHARED);
                     64:   now = now_seconds();
                     65:   if(!pslcache->psl || pslcache->expires <= now) {
                     66:     /* Let a chance to other threads to do the job: avoids deadlock. */
                     67:     Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
                     68: 
                     69:     /* Update cache: this needs an exclusive lock. */
                     70:     Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SINGLE);
                     71: 
                     72:     /* Recheck in case another thread did the job. */
                     73:     now = now_seconds();
                     74:     if(!pslcache->psl || pslcache->expires <= now) {
                     75:       bool dynamic = FALSE;
                     76:       time_t expires = TIME_T_MAX;
                     77: 
                     78: #if defined(PSL_VERSION_NUMBER) && PSL_VERSION_NUMBER >= 0x001000
                     79:       psl = psl_latest(NULL);
                     80:       dynamic = psl != NULL;
                     81:       /* Take care of possible time computation overflow. */
                     82:       expires = now < TIME_T_MAX - PSL_TTL? now + PSL_TTL: TIME_T_MAX;
                     83: 
                     84:       /* Only get the built-in PSL if we do not already have the "latest". */
                     85:       if(!psl && !pslcache->dynamic)
                     86: #endif
                     87: 
                     88:         psl = psl_builtin();
                     89: 
                     90:       if(psl) {
                     91:         Curl_psl_destroy(pslcache);
                     92:         pslcache->psl = psl;
                     93:         pslcache->dynamic = dynamic;
                     94:         pslcache->expires = expires;
                     95:       }
                     96:     }
                     97:     Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);  /* Release exclusive lock. */
                     98:     Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SHARED);
                     99:   }
                    100:   psl = pslcache->psl;
                    101:   if(!psl)
                    102:     Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
                    103:   return psl;
                    104: }
                    105: 
                    106: void Curl_psl_release(struct Curl_easy *easy)
                    107: {
                    108:   Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
                    109: }
                    110: 
                    111: #endif /* USE_LIBPSL */