72 lines
2.5 KiB
Groff
72 lines
2.5 KiB
Groff
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.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_FTP_USE_EPSV 3 "17 Jun 2014" libcurl libcurl
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.SH NAME
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CURLOPT_FTP_USE_EPSV \- use EPSV for FTP
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_USE_EPSV, long epsv);
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.fi
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.SH DESCRIPTION
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Pass \fIepsv\fP as a long. If the value is 1, it tells curl to use the EPSV
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command when doing passive FTP downloads (which it does by default). Using
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EPSV means that libcurl first attempts to use the EPSV command before using
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PASV. If you pass zero to this option, it does not use EPSV, only plain PASV.
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The EPSV command is a slightly newer addition to the FTP protocol than PASV
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and is the preferred command to use since it enables IPv6 to be used. Very old
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FTP servers might not support it, which is why libcurl has a fallback
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mechanism. Sometimes that fallback is not enough and then this option might
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come handy.
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If the server is an IPv6 host, this option has no effect.
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.SH DEFAULT
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1
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.SH PROTOCOLS
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FTP
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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if(curl) {
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curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/old-server/file.txt");
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/* let's shut off this modern feature */
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curl_easy_setopt(curl, CURLOPT_FTP_USE_EPSV, 0L);
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ret = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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.fi
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.SH AVAILABILITY
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Along with FTP
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.SH RETURN VALUE
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Returns CURLE_OK if FTP is supported, and CURLE_UNKNOWN_OPTION if not.
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.SH "SEE ALSO"
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.BR CURLOPT_FTP_USE_EPRT (3),
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.BR CURLOPT_FTPPORT (3)
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