CURLOPT_FTP_SKIP_PASV_IP(3)                           curl_easy_setopt options

NAME
       CURLOPT_FTP_SKIP_PASV_IP - ignore the IP address in the PASV response

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_SKIP_PASV_IP, long
       skip);

DESCRIPTION
       Pass a long. If skip is set to 1, it instructs libcurl to not use the
       IP address the server suggests in its 227-response to libcurl's PASV
       command when libcurl connects the data connection. Instead libcurl will
       re-use the same IP address it already uses for the control connection.
       But it will use the port number from the 227-response.

       This option thus allows libcurl to work around broken server
       installations that due to NATs, firewalls or incompetence report the
       wrong IP address back. Setting the option also reduces the risk for
       various sorts of client abuse by malicious servers.

       This option has no effect if PORT, EPRT or EPSV is used instead of
       PASV.

DEFAULT
       1 since 7.74.0, was 0 before then.

PROTOCOLS
       FTP

EXAMPLE
       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");

         /* please ignore the IP in the PASV response */
         curl_easy_setopt(curl, CURLOPT_FTP_SKIP_PASV_IP, 1L);
         ret = curl_easy_perform(curl);

         curl_easy_cleanup(curl);
       }

AVAILABILITY
       Added in 7.14.2

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

SEE ALSO
       CURLOPT_FTPPORT(3), CURLOPT_FTP_USE_EPRT(3),

libcurl 7.77.0                 November 24, 2020   CURLOPT_FTP_SKIP_PASV_IP(3)