CURLOPT_FTPSSLAUTH

Section: curl_easy_setopt options (3)
Updated: November 04, 2020
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NAME

CURLOPT_FTPSSLAUTH - set order in which to attempt TLS vs SSL when using FTP

SYNOPSIS

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPSSLAUTH, long order);

DESCRIPTION

Pass a long using one of the values from below, to alter how libcurl issues "AUTH TLS" or "AUTH SSL" when FTP over SSL is activated. This is only interesting if CURLOPT_USE_SSL(3) is also set.

Possible order values:

CURLFTPAUTH_DEFAULT: Allow libcurl to decide.
CURLFTPAUTH_SSL: Try "AUTH SSL" first, and only if that fails try "AUTH TLS".
CURLFTPAUTH_TLS: Try "AUTH TLS" first, and only if that fails try "AUTH SSL".

DEFAULT

CURLFTPAUTH_DEFAULT

PROTOCOLS

FTP

EXAMPLE

CURL *curl = curl_easy_init();
if(curl) {
  curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");
  curl_easy_setopt(curl, CURLOPT_USE_SSL, CURLUSESSL_TRY);
  /* funny server, ask for SSL before TLS */
  curl_easy_setopt(curl, CURLOPT_FTPSSLAUTH, CURLFTPAUTH_SSL);
  ret = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}

AVAILABILITY

Added in 7.12.2

RETURN VALUE

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