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.TH CURLOPT_FTP_USE_EPSV 3 "December 04, 2023" "ibcurl 8.5.0" libcurl

.SH NAME
CURLOPT_FTP_USE_EPSV \- use EPSV for FTP
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_USE_EPSV, long epsv);
.fi
.SH DESCRIPTION
Pass \fIepsv\fP as a long. If the value is 1, it tells curl to use the EPSV
command when doing passive FTP downloads (which it does by default). Using
EPSV means that libcurl first attempts to use the EPSV command before using
PASV. If you pass zero to this option, it does not use EPSV, only plain PASV.

The EPSV command is a slightly newer addition to the FTP protocol than PASV
and is the preferred command to use since it enables IPv6 to be used. Very old
FTP servers might not support it, which is why libcurl has a fallback
mechanism. Sometimes that fallback is not enough and then this option might
come handy.

If the server is an IPv6 host, this option has no effect.
.SH DEFAULT
1
.SH PROTOCOLS
FTP
.SH EXAMPLE
.nf
int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL,
                     "ftp://example.com/old-server/file.txt");

    /* let's shut off this modern feature */
    curl_easy_setopt(curl, CURLOPT_FTP_USE_EPSV, 0L);

    res = curl_easy_perform(curl);

    curl_easy_cleanup(curl);
  }
}
.fi
.SH AVAILABILITY
Along with FTP
.SH RETURN VALUE
Returns CURLE_OK if FTP is supported, and CURLE_UNKNOWN_OPTION if not.
.SH "SEE ALSO"
.BR CURLOPT_FTP_USE_EPRT (3),
.BR CURLOPT_FTPPORT (3)