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