| 1 | /***************************************************************************
|
|---|
| 2 | * _ _ ____ _
|
|---|
| 3 | * Project ___| | | | _ \| |
|
|---|
| 4 | * / __| | | | |_) | |
|
|---|
| 5 | * | (__| |_| | _ <| |___
|
|---|
| 6 | * \___|\___/|_| \_\_____|
|
|---|
| 7 | *
|
|---|
| 8 | * Copyright (C) 1998 - 2018, Daniel Stenberg, <[email protected]>, 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 */
|
|---|
