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Daniel Stenberg e3fe020089

docs/libcurl: generate PROTOCOLS from meta-data

Remove the PROTOCOLS section from the source files completely and
instead generate them based on the header data in the curldown files.

It also generates TLS backend information for options marked for TLS as
protocol.

Closes #13175

2024-03-23 18:13:03 +01:00

1.6 KiB

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SPDX-License-Identifier

Title

Section

Source

Protocol

See-also

curl

CURLOPT_FTP_USE_EPRT

libcurl

FTP

CURLOPT_FTPPORT (3)

CURLOPT_FTP_USE_EPSV (3)

NAME

CURLOPT_FTP_USE_EPRT - use EPRT for FTP

SYNOPSIS

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_USE_EPRT, long enabled);

DESCRIPTION

Pass a long. If the value is 1, it tells curl to use the EPRT command when doing active FTP downloads (which is enabled by CURLOPT_FTPPORT(3)). Using EPRT means that libcurl first attempts to use EPRT before using PORT, but if you pass zero to this option, it avoids using EPRT, only plain PORT.

The EPRT command is a slightly newer addition to the FTP protocol than PORT and is the preferred command to use since it enables IPv6 to be used. 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 as EPRT is necessary then.

DEFAULT

EXAMPLE

int main(void)
{
  CURL *curl = curl_easy_init();
  if(curl) {
    CURLcode res;
    curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt");

    /* contact us back, aka "active" FTP */
    curl_easy_setopt(curl, CURLOPT_FTPPORT, "-");

    /* FTP the way the neanderthals did it */
    curl_easy_setopt(curl, CURLOPT_FTP_USE_EPRT, 0L);

    res = curl_easy_perform(curl);

    curl_easy_cleanup(curl);
  }
}

AVAILABILITY

Added in 7.10.5

RETURN VALUE

Returns CURLE_OK

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