1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2011, 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 /* Upload to FTP, resuming failed transfers
23 *
24 * Compile for MinGW like this:
25 * gcc -Wall -pedantic -std=c99 ftpuploadwithresume.c -o ftpuploadresume.exe
26 * -lcurl -lmsvcr70
27 *
28 * Written by Philip Bock
29 */
30
31 #include <stdlib.h>
32 #include <stdio.h>
33
34 #include <curl/curl.h>
35
36 #if defined(_MSC_VER) && (_MSC_VER < 1300)
37 # error _snscanf requires MSVC 7.0 or later.
38 #endif
39
40 /* The MinGW headers are missing a few Win32 function definitions,
41 you shouldn't need this if you use VC++ */
42 #if defined(__MINGW32__) && !defined(__MINGW64__)
43 int __cdecl _snscanf(const char * input, size_t length, const char * format, ...);
44 #endif
45
46
47 /* parse headers for Content-Length */
getcontentlengthfunc(void * ptr,size_t size,size_t nmemb,void * stream)48 size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb, void *stream)
49 {
50 int r;
51 long len = 0;
52
53 /* _snscanf() is Win32 specific */
54 r = _snscanf(ptr, size * nmemb, "Content-Length: %ld\n", &len);
55
56 if (r) /* Microsoft: we don't read the specs */
57 *((long *) stream) = len;
58
59 return size * nmemb;
60 }
61
62 /* discard downloaded data */
discardfunc(void * ptr,size_t size,size_t nmemb,void * stream)63 size_t discardfunc(void *ptr, size_t size, size_t nmemb, void *stream)
64 {
65 return size * nmemb;
66 }
67
68 /* read data to upload */
readfunc(void * ptr,size_t size,size_t nmemb,void * stream)69 size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)
70 {
71 FILE *f = stream;
72 size_t n;
73
74 if (ferror(f))
75 return CURL_READFUNC_ABORT;
76
77 n = fread(ptr, size, nmemb, f) * size;
78
79 return n;
80 }
81
82
upload(CURL * curlhandle,const char * remotepath,const char * localpath,long timeout,long tries)83 int upload(CURL *curlhandle, const char * remotepath, const char * localpath,
84 long timeout, long tries)
85 {
86 FILE *f;
87 long uploaded_len = 0;
88 CURLcode r = CURLE_GOT_NOTHING;
89 int c;
90
91 f = fopen(localpath, "rb");
92 if (f == NULL) {
93 perror(NULL);
94 return 0;
95 }
96
97 curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, 1L);
98
99 curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);
100
101 if (timeout)
102 curl_easy_setopt(curlhandle, CURLOPT_FTP_RESPONSE_TIMEOUT, timeout);
103
104 curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);
105 curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &uploaded_len);
106
107 curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, discardfunc);
108
109 curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);
110 curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);
111
112 curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-"); /* disable passive mode */
113 curl_easy_setopt(curlhandle, CURLOPT_FTP_CREATE_MISSING_DIRS, 1L);
114
115 curl_easy_setopt(curlhandle, CURLOPT_VERBOSE, 1L);
116
117 for (c = 0; (r != CURLE_OK) && (c < tries); c++) {
118 /* are we resuming? */
119 if (c) { /* yes */
120 /* determine the length of the file already written */
121
122 /*
123 * With NOBODY and NOHEADER, libcurl will issue a SIZE
124 * command, but the only way to retrieve the result is
125 * to parse the returned Content-Length header. Thus,
126 * getcontentlengthfunc(). We need discardfunc() above
127 * because HEADER will dump the headers to stdout
128 * without it.
129 */
130 curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 1L);
131 curl_easy_setopt(curlhandle, CURLOPT_HEADER, 1L);
132
133 r = curl_easy_perform(curlhandle);
134 if (r != CURLE_OK)
135 continue;
136
137 curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 0L);
138 curl_easy_setopt(curlhandle, CURLOPT_HEADER, 0L);
139
140 fseek(f, uploaded_len, SEEK_SET);
141
142 curl_easy_setopt(curlhandle, CURLOPT_APPEND, 1L);
143 }
144 else { /* no */
145 curl_easy_setopt(curlhandle, CURLOPT_APPEND, 0L);
146 }
147
148 r = curl_easy_perform(curlhandle);
149 }
150
151 fclose(f);
152
153 if (r == CURLE_OK)
154 return 1;
155 else {
156 fprintf(stderr, "%s\n", curl_easy_strerror(r));
157 return 0;
158 }
159 }
160
main(int c,char ** argv)161 int main(int c, char **argv)
162 {
163 CURL *curlhandle = NULL;
164
165 curl_global_init(CURL_GLOBAL_ALL);
166 curlhandle = curl_easy_init();
167
168 upload(curlhandle, "ftp://user:pass@example.com/path/file", "C:\\file", 0, 3);
169
170 curl_easy_cleanup(curlhandle);
171 curl_global_cleanup();
172
173 return 0;
174 }
175