1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
9  *
10  * This software is licensed as described in the file COPYING, which
11  * you should have received as part of this distribution. The terms
12  * are also available at https://curl.haxx.se/docs/copyright.html.
13  *
14  * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15  * copies of the Software, and permit persons to whom the Software is
16  * furnished to do so, under the terms of the COPYING file.
17  *
18  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19  * KIND, either express or implied.
20  *
21  ***************************************************************************/
22 #include <stdio.h>
23 
24 #include <curl/curl.h>
25 
26 /* <DESC>
27  * Get a single file from an FTP server.
28  * </DESC>
29  */
30 
31 struct FtpFile {
32   const char *filename;
33   FILE *stream;
34 };
35 
36 static size_t my_fwrite(void *buffer, size_t size, size_t nmemb, void *stream)
37 {
38   struct FtpFile *out = (struct FtpFile *)stream;
39   if(out && !out->stream) {
40     /* open file for writing */
41     out->stream = fopen(out->filename, "wb");
42     if(!out->stream)
43       return -1; /* failure, can't open file to write */
44   }
45   return fwrite(buffer, size, nmemb, out->stream);
46 }
47 
48 
49 int main(void)
50 {
51   CURL *curl;
52   CURLcode res;
53   struct FtpFile ftpfile = {
54     "curl.tar.gz", /* name to store the file as if successful */
55     NULL
56   };
57 
58   curl_global_init(CURL_GLOBAL_DEFAULT);
59 
60   curl = curl_easy_init();
61   if(curl) {
62     /*
63      * You better replace the URL with one that works!
64      */
65     curl_easy_setopt(curl, CURLOPT_URL,
66                      "ftp://ftp.example.com/curl/curl-7.9.2.tar.gz");
67     /* Define our callback to get called when there's data to be written */
68     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_fwrite);
69     /* Set a pointer to our struct to pass to the callback */
70     curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ftpfile);
71 
72     /* Switch on full protocol/debug output */
73     curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
74 
75     res = curl_easy_perform(curl);
76 
77     /* always cleanup */
78     curl_easy_cleanup(curl);
79 
80     if(CURLE_OK != res) {
81       /* we failed */
82       fprintf(stderr, "curl told us %d\n", res);
83     }
84   }
85 
86   if(ftpfile.stream)
87     fclose(ftpfile.stream); /* close the local file */
88 
89   curl_global_cleanup();
90 
91   return 0;
92 }
93