CURLOPT_FTP_USE_EPRT.md (1794B)
1 --- 2 c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3 SPDX-License-Identifier: curl 4 Title: CURLOPT_FTP_USE_EPRT 5 Section: 3 6 Source: libcurl 7 Protocol: 8 - FTP 9 See-also: 10 - CURLOPT_FTPPORT (3) 11 - CURLOPT_FTP_USE_EPSV (3) 12 Added-in: 7.10.5 13 --- 14 15 # NAME 16 17 CURLOPT_FTP_USE_EPRT - use EPRT for FTP 18 19 # SYNOPSIS 20 21 ~~~c 22 #include <curl/curl.h> 23 24 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_USE_EPRT, long enabled); 25 ~~~ 26 27 # DESCRIPTION 28 29 Pass a long. If the value is 1, it tells curl to use the EPRT command when 30 doing active FTP downloads (which is enabled by 31 CURLOPT_FTPPORT(3)). Using EPRT means that libcurl first attempts to use 32 EPRT before using PORT, but if you pass zero to this option, it avoids using 33 EPRT, only plain PORT. 34 35 The EPRT command is a slightly newer addition to the FTP protocol than PORT 36 and is the preferred command to use since it enables IPv6 to be used. Old FTP 37 servers might not support it, which is why libcurl has a fallback mechanism. 38 Sometimes that fallback is not enough and then this option might come handy. 39 40 If the server is an IPv6 host, this option has no effect as EPRT is necessary 41 then. 42 43 # DEFAULT 44 45 # %PROTOCOLS% 46 47 # EXAMPLE 48 49 ~~~c 50 int main(void) 51 { 52 CURL *curl = curl_easy_init(); 53 if(curl) { 54 CURLcode res; 55 curl_easy_setopt(curl, CURLOPT_URL, "ftp://example.com/file.txt"); 56 57 /* contact us back, aka "active" FTP */ 58 curl_easy_setopt(curl, CURLOPT_FTPPORT, "-"); 59 60 /* FTP the way the neanderthals did it */ 61 curl_easy_setopt(curl, CURLOPT_FTP_USE_EPRT, 0L); 62 63 res = curl_easy_perform(curl); 64 65 curl_easy_cleanup(curl); 66 } 67 } 68 ~~~ 69 70 # %AVAILABILITY% 71 72 # RETURN VALUE 73 74 curl_easy_setopt(3) returns a CURLcode indicating success or error. 75 76 CURLE_OK (0) means everything was OK, non-zero means an error occurred, see 77 libcurl-errors(3).