CURLOPT_FTP_USE_EPSV(3) Library Functions Manual CURLOPT_FTP_USE_EPSV(3)
NAME
CURLOPT_FTP_USE_EPSV - use EPSV for FTP
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_USE_EPSV, long epsv);
DESCRIPTION
Pass epsv 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. 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.
DEFAULT
1
PROTOCOLS
This functionality affects ftp only
EXAMPLE
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);
}
}
AVAILABILITY
Added in curl 7.9.2
RETURN VALUE
Returns CURLE_OK if FTP is supported, and CURLE_UNKNOWN_OPTION if not.
SEE ALSO
CURLOPT_FTPPORT(3), CURLOPT_FTP_USE_EPRT(3)
libcurl 2024-08-05 CURLOPT_FTP_USE_EPSV(3)
curl 8.9.1 - Generated Wed Aug 7 08:56:06 CDT 2024