CURLOPT_FTP_ALTERNATIVE_TO_USER(3)                    Library Functions Manual

NAME
       CURLOPT_FTP_ALTERNATIVE_TO_USER - command to use instead of USER with
       FTP

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_ALTERNATIVE_TO_USER,
                                 char *cmd);

DESCRIPTION
       Pass a char pointer as parameter, pointing to a string which is used to
       authenticate if the usual FTP "USER user" and "PASS password"
       negotiation fails. This is currently only known to be required when
       connecting to Tumbleweed's Secure Transport FTPS server using client
       certificates for authentication.

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

DEFAULT
       NULL

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/foo.bin");
           curl_easy_setopt(curl, CURLOPT_FTP_ALTERNATIVE_TO_USER, "two users");
           res = curl_easy_perform(curl);

           curl_easy_cleanup(curl);
         }
       }

AVAILABILITY
       Added in curl 7.15.5

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLOPT_FTP_ACCOUNT(3), CURLOPT_FTP_SKIP_PASV_IP(3),
       CURLOPT_SERVER_RESPONSE_TIMEOUT(3), CURLOPT_USERNAME(3)

libcurl                           2025-02-13
                                            CURLOPT_FTP_ALTERNATIVE_TO_USER(3)