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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2022, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
#include "curl_setup.h"
#include <curl/curl.h>
#ifdef USE_LIBPSL
#include "psl.h"
#include "share.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
void Curl_psl_destroy(struct PslCache *pslcache)
{
if(pslcache->psl) {
if(pslcache->dynamic)
psl_free((psl_ctx_t *) pslcache->psl);
pslcache->psl = NULL;
pslcache->dynamic = FALSE;
}
}
static time_t now_seconds(void)
{
struct curltime now = Curl_now();
return now.tv_sec;
}
const psl_ctx_t *Curl_psl_use(struct Curl_easy *easy)
{
struct PslCache *pslcache = easy->psl;
const psl_ctx_t *psl;
time_t now;
if(!pslcache)
return NULL;
Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SHARED);
now = now_seconds();
if(!pslcache->psl || pslcache->expires <= now) {
/* Let a chance to other threads to do the job: avoids deadlock. */
Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
/* Update cache: this needs an exclusive lock. */
Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SINGLE);
/* Recheck in case another thread did the job. */
now = now_seconds();
if(!pslcache->psl || pslcache->expires <= now) {
bool dynamic = FALSE;
time_t expires = TIME_T_MAX;
#if defined(PSL_VERSION_NUMBER) && PSL_VERSION_NUMBER >= 0x001000
psl = psl_latest(NULL);
dynamic = psl != NULL;
/* Take care of possible time computation overflow. */
expires = now < TIME_T_MAX - PSL_TTL? now + PSL_TTL: TIME_T_MAX;
/* Only get the built-in PSL if we do not already have the "latest". */
if(!psl && !pslcache->dynamic)
#endif
psl = psl_builtin();
if(psl) {
Curl_psl_destroy(pslcache);
pslcache->psl = psl;
pslcache->dynamic = dynamic;
pslcache->expires = expires;
}
}
Curl_share_unlock(easy, CURL_LOCK_DATA_PSL); /* Release exclusive lock. */
Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SHARED);
}
psl = pslcache->psl;
if(!psl)
Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
return psl;
}
void Curl_psl_release(struct Curl_easy *easy)
{
Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
}
#endif /* USE_LIBPSL */
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