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