docs/examples/certinfo.c - master - githubmirror/curl

docs/examples/certinfo.c
87 строк2 KB
Ted Lyngmo
docs: use the correct CURLOPT_WRITEFUNCTION signature
08 апр 2026, 12:25
08 апр 2026, 12:251356650
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 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
 *
 ***************************************************************************/
/* <DESC>
 * Extract lots of TLS certificate info.
 * </DESC>
 */
#include <stdio.h>

#include <curl/curl.h>

static size_t write_cb(char *ptr, size_t size, size_t nmemb, void *stream)
{
  (void)stream;
  (void)ptr;
  return size * nmemb;
}

int main(void)
{
  CURL *curl;
  CURLcode result;

  result = curl_global_init(CURL_GLOBAL_ALL);
  if(result != CURLE_OK)
    return (int)result;

  curl = curl_easy_init();
  if(curl) {
    curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");

    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_cb);

    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
    curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);

    curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L);
    curl_easy_setopt(curl, CURLOPT_CERTINFO, 1L);

    result = curl_easy_perform(curl);

    if(result == CURLE_OK) {
      struct curl_certinfo *certinfo;

      result = curl_easy_getinfo(curl, CURLINFO_CERTINFO, &certinfo);

      if(!result && certinfo) {
        int i;

        printf("%d certs!\n", certinfo->num_of_certs);

        for(i = 0; i < certinfo->num_of_certs; i++) {
          struct curl_slist *slist;

          for(slist = certinfo->certinfo[i]; slist; slist = slist->next)
            printf("%s\n", slist->data);
        }
      }
    }

    curl_easy_cleanup(curl);
  }

  curl_global_cleanup();

  return (int)result;
}