1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2016, 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 /* <DESC>
23 * Upload to FTP, resuming failed transfers.
24 * </DESC>
25 */
26
27 #include <stdlib.h>
28 #include <stdio.h>
29
30 #include <curl/curl.h>
31
32 #if defined(_MSC_VER) && (_MSC_VER < 1300)
33 # error _snscanf requires MSVC 7.0 or later.
34 #endif
35
36 /* The MinGW headers are missing a few Win32 function definitions,
37 you shouldn't need this if you use VC++ */
38 #if defined(__MINGW32__) && !defined(__MINGW64__)
39 int __cdecl _snscanf(const char * input, size_t length,
40 const char * format, ...);
41 #endif
42
43
44 /* parse headers for Content-Length */
getcontentlengthfunc(void * ptr,size_t size,size_t nmemb,void * stream)45 size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb, void *stream)
46 {
47 int r;
48 long len = 0;
49
50 /* _snscanf() is Win32 specific */
51 r = _snscanf(ptr, size * nmemb, "Content-Length: %ld\n", &len);
52
53 if(r) /* Microsoft: we don't read the specs */
54 *((long *) stream) = len;
55
56 return size * nmemb;
57 }
58
59 /* discard downloaded data */
discardfunc(void * ptr,size_t size,size_t nmemb,void * stream)60 size_t discardfunc(void *ptr, size_t size, size_t nmemb, void *stream)
61 {
62 return size * nmemb;
63 }
64
65 /* read data to upload */
readfunc(void * ptr,size_t size,size_t nmemb,void * stream)66 size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)
67 {
68 FILE *f = stream;
69 size_t n;
70
71 if(ferror(f))
72 return CURL_READFUNC_ABORT;
73
74 n = fread(ptr, size, nmemb, f) * size;
75
76 return n;
77 }
78
79
upload(CURL * curlhandle,const char * remotepath,const char * localpath,long timeout,long tries)80 int upload(CURL *curlhandle, const char * remotepath, const char * localpath,
81 long timeout, long tries)
82 {
83 FILE *f;
84 long uploaded_len = 0;
85 CURLcode r = CURLE_GOT_NOTHING;
86 int c;
87
88 f = fopen(localpath, "rb");
89 if(!f) {
90 perror(NULL);
91 return 0;
92 }
93
94 curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, 1L);
95
96 curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);
97
98 if(timeout)
99 curl_easy_setopt(curlhandle, CURLOPT_FTP_RESPONSE_TIMEOUT, timeout);
100
101 curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);
102 curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &uploaded_len);
103
104 curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, discardfunc);
105
106 curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);
107 curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);
108
109 /* disable passive mode */
110 curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-");
111 curl_easy_setopt(curlhandle, CURLOPT_FTP_CREATE_MISSING_DIRS, 1L);
112
113 curl_easy_setopt(curlhandle, CURLOPT_VERBOSE, 1L);
114
115 for(c = 0; (r != CURLE_OK) && (c < tries); c++) {
116 /* are we resuming? */
117 if(c) { /* yes */
118 /* determine the length of the file already written */
119
120 /*
121 * With NOBODY and NOHEADER, libcurl will issue a SIZE
122 * command, but the only way to retrieve the result is
123 * to parse the returned Content-Length header. Thus,
124 * getcontentlengthfunc(). We need discardfunc() above
125 * because HEADER will dump the headers to stdout
126 * without it.
127 */
128 curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 1L);
129 curl_easy_setopt(curlhandle, CURLOPT_HEADER, 1L);
130
131 r = curl_easy_perform(curlhandle);
132 if(r != CURLE_OK)
133 continue;
134
135 curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 0L);
136 curl_easy_setopt(curlhandle, CURLOPT_HEADER, 0L);
137
138 fseek(f, uploaded_len, SEEK_SET);
139
140 curl_easy_setopt(curlhandle, CURLOPT_APPEND, 1L);
141 }
142 else { /* no */
143 curl_easy_setopt(curlhandle, CURLOPT_APPEND, 0L);
144 }
145
146 r = curl_easy_perform(curlhandle);
147 }
148
149 fclose(f);
150
151 if(r == CURLE_OK)
152 return 1;
153 else {
154 fprintf(stderr, "%s\n", curl_easy_strerror(r));
155 return 0;
156 }
157 }
158
main(int c,char ** argv)159 int main(int c, char **argv)
160 {
161 CURL *curlhandle = NULL;
162
163 curl_global_init(CURL_GLOBAL_ALL);
164 curlhandle = curl_easy_init();
165
166 upload(curlhandle, "ftp://user:pass@example.com/path/file", "C:\\file",
167 0, 3);
168
169 curl_easy_cleanup(curlhandle);
170 curl_global_cleanup();
171
172 return 0;
173 }
174