quickjs-tart

quickjs-based runtime for wallet-core logic
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CURLOPT_FTP_USE_EPSV.md (1708B)

      1 ---
      2 c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
      3 SPDX-License-Identifier: curl
      4 Title: CURLOPT_FTP_USE_EPSV
      5 Section: 3
      6 Source: libcurl
      7 Protocol:
      8   - FTP
      9 See-also:
     10   - CURLOPT_FTPPORT (3)
     11   - CURLOPT_FTP_USE_EPRT (3)
     12 Added-in: 7.9.2
     13 ---
     14 
     15 # NAME
     16 
     17 CURLOPT_FTP_USE_EPSV - use EPSV for FTP
     18 
     19 # SYNOPSIS
     20 
     21 ~~~c
     22 #include <curl/curl.h>
     23 
     24 CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTP_USE_EPSV, long epsv);
     25 ~~~
     26 
     27 # DESCRIPTION
     28 
     29 Pass *epsv* as a long. If the value is 1, it tells curl to use the EPSV
     30 command when doing passive FTP downloads (which it does by default). Using
     31 EPSV means that libcurl first attempts to use the EPSV command before using
     32 PASV. If you pass zero to this option, it does not use EPSV, only plain PASV.
     33 
     34 The EPSV command is a slightly newer addition to the FTP protocol than PASV
     35 and is the preferred command to use since it enables IPv6 to be used. Old FTP
     36 servers might not support it, which is why libcurl has a fallback mechanism.
     37 Sometimes that fallback is not enough and then this option might come handy.
     38 
     39 If the server is an IPv6 host, this option has no effect.
     40 
     41 # DEFAULT
     42 
     43 1
     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,
     56                      "ftp://example.com/old-server/file.txt");
     57 
     58     /* let's shut off this modern feature */
     59     curl_easy_setopt(curl, CURLOPT_FTP_USE_EPSV, 0L);
     60 
     61     res = curl_easy_perform(curl);
     62 
     63     curl_easy_cleanup(curl);
     64   }
     65 }
     66 ~~~
     67 
     68 # %AVAILABILITY%
     69 
     70 # RETURN VALUE
     71 
     72 curl_easy_setopt(3) returns a CURLcode indicating success or error.
     73 
     74 CURLE_OK (0) means everything was OK, non-zero means an error occurred, see
     75 libcurl-errors(3).