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CURLOPT_CAPATH(3) curl_easy_setopt options CURLOPT_CAPATH(3)

CURLOPT_CAPATH - directory holding CA certificates

#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_CAPATH, char *capath);

Pass a char * to a null-terminated string naming a directory holding multiple CA certificates to verify the peer with. If libcurl is built against OpenSSL, the certificate directory must be prepared using the openssl c_rehash utility. This makes sense only when used in combination with the CURLOPT_SSL_VERIFYPEER(3) option.

The CURLOPT_CAPATH(3) function apparently does not work in Windows due to some limitation in openssl.

The application does not have to keep the string around after setting this option.

A default path detected at build time.

All TLS based protocols: HTTPS, FTPS, IMAPS, POP3S, SMTPS etc.

CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
  curl_easy_setopt(curl, CURLOPT_CAPATH, "/etc/cert-dir");
  ret = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}

This option is supported by the OpenSSL, GnuTLS and mbedTLS (since 7.56.0) backends. The NSS backend provides the option only for backward compatibility.

CURLE_OK if supported; or an error such as:

CURLE_NOT_BUILT_IN - Not supported by the SSL backend

CURLE_UNKNOWN_OPTION

CURLE_OUT_OF_MEMORY

CURLOPT_CAINFO(3), CURLOPT_STDERR(3), CURLOPT_DEBUGFUNCTION(3),
November 26, 2021 libcurl 7.83.1

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