74 lines
1.6 KiB
Markdown
74 lines
1.6 KiB
Markdown
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLOPT_FTP_USE_EPSV
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Section: 3
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Source: libcurl
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See-also:
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- CURLOPT_FTPPORT (3)
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- CURLOPT_FTP_USE_EPRT (3)
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---
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# NAME
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CURLOPT_FTP_USE_EPSV - use EPSV for FTP
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# SYNOPSIS
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~~~c
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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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~~~
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# DESCRIPTION
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Pass *epsv* 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. Old FTP
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servers might not support it, which is why libcurl has a fallback mechanism.
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Sometimes that fallback is not enough and then this option might come handy.
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If the server is an IPv6 host, this option has no effect.
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# DEFAULT
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1
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# PROTOCOLS
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FTP
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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curl_easy_setopt(curl, CURLOPT_URL,
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"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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res = curl_easy_perform(curl);
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curl_easy_cleanup(curl);
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}
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}
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~~~
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# AVAILABILITY
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Along with FTP
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# RETURN VALUE
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Returns CURLE_OK if FTP is supported, and CURLE_UNKNOWN_OPTION if not.
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