CURLOPT_FTPSSLAUTH explained

Name

CURLOPT_FTPSSLAUTH - order in which to attempt TLS vs SSL

Synopsis

#include <curl/curl.h>
 
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 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

This functionality affects ftp only

Example

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    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, (long)CURLFTPAUTH_SSL);
    res = curl_easy_perform(curl);
    curl_easy_cleanup(curl);
  }
}

Availability

Added in curl 7.12.2

Return value

curl_easy_setopt returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non-zero means an error occurred, see libcurl-errors.