1 /***************************************************************************
3 * Project ___| | | | _ \| |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
8 * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
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.
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.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ***************************************************************************/
23 * Upload to FTP, resuming failed transfers.
29 #include <curl/curl.h>
31 /* parse headers for Content-Length */
32 static size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb,
38 r = sscanf(ptr, "Content-Length: %ld\n", &len);
40 *((long *) stream) = len;
45 /* discard downloaded data */
46 static size_t discardfunc(void *ptr, size_t size, size_t nmemb, void *stream)
53 /* read data to upload */
54 static size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)
60 return CURL_READFUNC_ABORT;
62 n = fread(ptr, size, nmemb, f) * size;
68 static int upload(CURL *curlhandle, const char *remotepath,
69 const char *localpath, long timeout, long tries)
72 long uploaded_len = 0;
73 CURLcode r = CURLE_GOT_NOTHING;
76 f = fopen(localpath, "rb");
82 curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, 1L);
84 curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);
87 curl_easy_setopt(curlhandle, CURLOPT_FTP_RESPONSE_TIMEOUT, timeout);
89 curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);
90 curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &uploaded_len);
92 curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, discardfunc);
94 curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);
95 curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);
97 /* disable passive mode */
98 curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-");
99 curl_easy_setopt(curlhandle, CURLOPT_FTP_CREATE_MISSING_DIRS, 1L);
101 curl_easy_setopt(curlhandle, CURLOPT_VERBOSE, 1L);
103 for(c = 0; (r != CURLE_OK) && (c < tries); c++) {
104 /* are we resuming? */
106 /* determine the length of the file already written */
109 * With NOBODY and NOHEADER, libcurl will issue a SIZE
110 * command, but the only way to retrieve the result is
111 * to parse the returned Content-Length header. Thus,
112 * getcontentlengthfunc(). We need discardfunc() above
113 * because HEADER will dump the headers to stdout
116 curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 1L);
117 curl_easy_setopt(curlhandle, CURLOPT_HEADER, 1L);
119 r = curl_easy_perform(curlhandle);
123 curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 0L);
124 curl_easy_setopt(curlhandle, CURLOPT_HEADER, 0L);
126 fseek(f, uploaded_len, SEEK_SET);
128 curl_easy_setopt(curlhandle, CURLOPT_APPEND, 1L);
131 curl_easy_setopt(curlhandle, CURLOPT_APPEND, 0L);
134 r = curl_easy_perform(curlhandle);
142 fprintf(stderr, "%s\n", curl_easy_strerror(r));
149 CURL *curlhandle = NULL;
151 curl_global_init(CURL_GLOBAL_ALL);
152 curlhandle = curl_easy_init();
154 upload(curlhandle, "ftp://user:pass@example.com/path/file", "C:\\file",
157 curl_easy_cleanup(curlhandle);
158 curl_global_cleanup();