CURLOPT_FTPPORT(3)         curl_easy_setopt options         CURLOPT_FTPPORT(3)

NAME
       CURLOPT_FTPPORT - make FTP transfer active

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPPORT, char *spec);

DESCRIPTION
       Pass a pointer to a null-terminated string as parameter. It specifies
       that the FTP transfer will be made actively and the given string will
       be used to get the IP address to use for the FTP PORT instruction.

       The PORT instruction tells the remote server to connect to our
       specified IP address. The string may be a plain IP address, a host
       name, a network interface name (under Unix) or just a '-' symbol to let
       the library use your system's default IP address. Default FTP
       operations are passive, and thus won't use PORT.

       The address can be followed by a ':' to specify a port, optionally
       followed by a '-' to specify a port range.  If the port specified is 0,
       the operating system will pick a free port.  If a range is provided and
       all ports in the range are not available, libcurl will report
       CURLE_FTP_PORT_FAILED for the handle.  Invalid port/range settings are
       ignored.  IPv6 addresses followed by a port or portrange have to be in
       brackets.  IPv6 addresses without port/range specifier can be in
       brackets.

       Examples with specified ports:

         eth0:0
         192.168.1.2:32000-33000
         curl.se:32123
         [::1]:1234-4567

       You disable PORT again and go back to using the passive version by
       setting this option to NULL.

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

DEFAULT
       NULL

PROTOCOLS
       FTP

EXAMPLE
       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/old-server/file.txt");
         curl_easy_setopt(curl, CURLOPT_FTPPORT, "-");
         ret = curl_easy_perform(curl);
         curl_easy_cleanup(curl);
       }

AVAILABILITY
       Port range support was added in 7.19.5

RETURN VALUE
       Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if
       not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO
       CURLOPT_FTP_USE_EPRT(3), CURLOPT_FTP_USE_EPSV(3),

libcurl 7.77.0                 November 4, 2020             CURLOPT_FTPPORT(3)