1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24 #include <stdio.h>
25 #include <string.h>
26
27 #include <curl/curl.h>
28 #include <sys/types.h>
29 #include <sys/stat.h>
30 #include <fcntl.h>
31 #include <errno.h>
32 #ifdef _WIN32
33 #include <io.h>
34 #else
35 #include <unistd.h>
36 #endif
37
38 /* <DESC>
39 * Performs an FTP upload and renames the file just after a successful
40 * transfer.
41 * </DESC>
42 */
43
44 #define LOCAL_FILE "/tmp/uploadthis.txt"
45 #define UPLOAD_FILE_AS "while-uploading.txt"
46 #define REMOTE_URL "ftp://example.com/" UPLOAD_FILE_AS
47 #define RENAME_FILE_TO "renamed-and-fine.txt"
48
49 /* NOTE: if you want this example to work on Windows with libcurl as a DLL,
50 you MUST also provide a read callback with CURLOPT_READFUNCTION. Failing to
51 do so might give you a crash since a DLL may not use the variable's memory
52 when passed in to it from an app like this. */
read_callback(char * ptr,size_t size,size_t nmemb,void * stream)53 static size_t read_callback(char *ptr, size_t size, size_t nmemb, void *stream)
54 {
55 unsigned long nread;
56 /* in real-world cases, this would probably get this data differently
57 as this fread() stuff is exactly what the library already would do
58 by default internally */
59 size_t retcode = fread(ptr, size, nmemb, stream);
60
61 if(retcode > 0) {
62 nread = (unsigned long)retcode;
63 fprintf(stderr, "*** We read %lu bytes from file\n", nread);
64 }
65
66 return retcode;
67 }
68
main(void)69 int main(void)
70 {
71 CURL *curl;
72 CURLcode res;
73 FILE *hd_src;
74 struct stat file_info;
75 unsigned long fsize;
76
77 struct curl_slist *headerlist = NULL;
78 static const char buf_1 [] = "RNFR " UPLOAD_FILE_AS;
79 static const char buf_2 [] = "RNTO " RENAME_FILE_TO;
80
81 /* get the file size of the local file */
82 if(stat(LOCAL_FILE, &file_info)) {
83 printf("Couldn't open '%s': %s\n", LOCAL_FILE, strerror(errno));
84 return 1;
85 }
86 fsize = (unsigned long)file_info.st_size;
87
88 printf("Local file size: %lu bytes.\n", fsize);
89
90 /* get a FILE * of the same file */
91 hd_src = fopen(LOCAL_FILE, "rb");
92
93 /* In Windows, this inits the Winsock stuff */
94 curl_global_init(CURL_GLOBAL_ALL);
95
96 /* get a curl handle */
97 curl = curl_easy_init();
98 if(curl) {
99 /* build a list of commands to pass to libcurl */
100 headerlist = curl_slist_append(headerlist, buf_1);
101 headerlist = curl_slist_append(headerlist, buf_2);
102
103 /* we want to use our own read function */
104 curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
105
106 /* enable uploading */
107 curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
108
109 /* specify target */
110 curl_easy_setopt(curl, CURLOPT_URL, REMOTE_URL);
111
112 /* pass in that last of FTP commands to run after the transfer */
113 curl_easy_setopt(curl, CURLOPT_POSTQUOTE, headerlist);
114
115 /* now specify which file to upload */
116 curl_easy_setopt(curl, CURLOPT_READDATA, hd_src);
117
118 /* Set the size of the file to upload (optional). If you give a *_LARGE
119 option you MUST make sure that the type of the passed-in argument is a
120 curl_off_t. If you use CURLOPT_INFILESIZE (without _LARGE) you must
121 make sure that to pass in a type 'long' argument. */
122 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
123 (curl_off_t)fsize);
124
125 /* Now run off and do what you have been told! */
126 res = curl_easy_perform(curl);
127 /* Check for errors */
128 if(res != CURLE_OK)
129 fprintf(stderr, "curl_easy_perform() failed: %s\n",
130 curl_easy_strerror(res));
131
132 /* clean up the FTP commands list */
133 curl_slist_free_all(headerlist);
134
135 /* always cleanup */
136 curl_easy_cleanup(curl);
137 }
138 fclose(hd_src); /* close the local file */
139
140 curl_global_cleanup();
141 return 0;
142 }
143
