1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2012, 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 http://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
23#include <stdio.h>
24
25#include <curl/curl.h>
26
27/* define this to switch off the use of ssh-agent in this program */
28#undef DISABLE_SSH_AGENT
29
30/*
31 * This is an example showing how to get a single file from an SFTP server.
32 * It delays the actual destination file creation until the first write
33 * callback so that it won't create an empty file in case the remote file
34 * doesn't exist or something else fails.
35 */
36
37struct FtpFile {
38  const char *filename;
39  FILE *stream;
40};
41
42static size_t my_fwrite(void *buffer, size_t size, size_t nmemb,
43                        void *stream)
44{
45  struct FtpFile *out=(struct FtpFile *)stream;
46  if(out && !out->stream) {
47    /* open file for writing */
48    out->stream=fopen(out->filename, "wb");
49    if(!out->stream)
50      return -1; /* failure, can't open file to write */
51  }
52  return fwrite(buffer, size, nmemb, out->stream);
53}
54
55
56int main(void)
57{
58  CURL *curl;
59  CURLcode res;
60  struct FtpFile ftpfile={
61    "yourfile.bin", /* name to store the file as if succesful */
62    NULL
63  };
64
65  curl_global_init(CURL_GLOBAL_DEFAULT);
66
67  curl = curl_easy_init();
68  if(curl) {
69    /*
70     * You better replace the URL with one that works!
71     */
72    curl_easy_setopt(curl, CURLOPT_URL,
73                     "sftp://user@server/home/user/file.txt");
74    /* Define our callback to get called when there's data to be written */
75    curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, my_fwrite);
76    /* Set a pointer to our struct to pass to the callback */
77    curl_easy_setopt(curl, CURLOPT_WRITEDATA, &ftpfile);
78
79#ifndef DISABLE_SSH_AGENT
80    /* We activate ssh agent. For this to work you need
81       to have ssh-agent running (type set | grep SSH_AGENT to check) or
82       pageant on Windows (there is an icon in systray if so) */
83    curl_easy_setopt(curl, CURLOPT_SSH_AUTH_TYPES, CURLSSH_AUTH_AGENT);
84#endif
85
86    /* Switch on full protocol/debug output */
87    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
88
89    res = curl_easy_perform(curl);
90
91    /* always cleanup */
92    curl_easy_cleanup(curl);
93
94    if(CURLE_OK != res) {
95      /* we failed */
96      fprintf(stderr, "curl told us %d\n", res);
97    }
98  }
99
100  if(ftpfile.stream)
101    fclose(ftpfile.stream); /* close the local file */
102
103  curl_global_cleanup();
104
105  return 0;
106}
107