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
37 struct FtpFile {
38 const char *filename;
39 FILE *stream;
40 };
41
my_fwrite(void * buffer,size_t size,size_t nmemb,void * stream)42 static 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
main(void)56 int main(void)
57 {
58 CURL *curl;
59 CURLcode res;
60 struct FtpFile ftpfile={
61 "yourfile.bin", /* name to store the file as if successful */
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