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 Curl_psl_destroy(struct PslCache * pslcache)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 now_seconds(void)47 static time_t now_seconds(void) 48 { 49 struct curltime now = Curl_now(); 50 51 return now.tv_sec; 52 } 53 Curl_psl_use(struct Curl_easy * easy)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 Curl_psl_release(struct Curl_easy * easy)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 */ 112