CURLINFO_SSL_VERIFYRESULT man page

#include <curl/curl.h>

CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_SSL_VERIFYRESULT, long *result);

Pass a pointer to a long to receive the result of the server SSL certificate verification that was requested (using the CURLOPT_SSL_VERIFYPEER(3) option.

All using TLS

CURL *curl = curl_easy_init();
if(curl) {
  CURLcode res;
  long verifyresult;
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
  res = curl_easy_perform(curl);
  curl_easy_getinfo(curl, CURLINFO_SSL_VERIFYRESULT, &verifyresult);
  printf("The peer verification said %s\n", verifyresult?
         "fine":"BAAAD");
  curl_easy_cleanup(curl);
}

Added in 7.5

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

curl_easy_getinfo(3), curl_easy_setopt(3),

curl_easy_getinfo(3), CURLINFO_PROXY_SSL_VERIFYRESULT(3).