CURLOPT_CAPATH(3)

NAME
CURLOPT_CAPATH - directory holding CA certificates

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

DESCRIPTION
Pass a char pointer 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. The default value for this can be figured out with CURLINFO_CAPATH(3).

DEFAULT
A default path detected at build time.

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

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

AVAILABILITY
This option is supported by the OpenSSL, GnuTLS and mbedTLS (since 7.56.0) backends.

RETURN VALUE
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

SEE ALSO
CURLINFO_CAPATH(3), CURLOPT_CAINFO(3), CURLOPT_DEBUGFUNCTION(3), CURLOPT_STDERR(3)