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      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel (at) 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 #include <stdio.h>
     23 #include <string.h>
     24 
     25 #include <curl/curl.h>
     26 #include <sys/types.h>
     27 #include <sys/stat.h>
     28 #include <fcntl.h>
     29 #include <errno.h>
     30 #ifdef WIN32
     31 #include <io.h>
     32 #else
     33 #include <unistd.h>
     34 #endif
     35 
     36 /* <DESC>
     37  * Performs an FTP upload and renames the file just after a successful
     38  * transfer.
     39  * </DESC>
     40  */
     41 
     42 #define LOCAL_FILE      "/tmp/uploadthis.txt"
     43 #define UPLOAD_FILE_AS  "while-uploading.txt"
     44 #define REMOTE_URL      "ftp://example.com/"  UPLOAD_FILE_AS
     45 #define RENAME_FILE_TO  "renamed-and-fine.txt"
     46 
     47 /* NOTE: if you want this example to work on Windows with libcurl as a
     48    DLL, you MUST also provide a read callback with CURLOPT_READFUNCTION.
     49    Failing to do so will give you a crash since a DLL may not use the
     50    variable's memory when passed in to it from an app like this. */
     51 static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *stream)
     52 {
     53   curl_off_t nread;
     54   /* in real-world cases, this would probably get this data differently
     55      as this fread() stuff is exactly what the library already would do
     56      by default internally */
     57   size_t retcode = fread(ptr, size, nmemb, stream);
     58 
     59   nread = (curl_off_t)retcode;
     60 
     61   fprintf(stderr, "*** We read %" CURL_FORMAT_CURL_OFF_T
     62           " bytes from file\n", nread);
     63   return retcode;
     64 }
     65 
     66 int main(void)
     67 {
     68   CURL *curl;
     69   CURLcode res;
     70   FILE *hd_src;
     71   struct stat file_info;
     72   curl_off_t fsize;
     73 
     74   struct curl_slist *headerlist = NULL;
     75   static const char buf_1 [] = "RNFR " UPLOAD_FILE_AS;
     76   static const char buf_2 [] = "RNTO " RENAME_FILE_TO;
     77 
     78   /* get the file size of the local file */
     79   if(stat(LOCAL_FILE, &file_info)) {
     80     printf("Couldn't open '%s': %s\n", LOCAL_FILE, strerror(errno));
     81     return 1;
     82   }
     83   fsize = (curl_off_t)file_info.st_size;
     84 
     85   printf("Local file size: %" CURL_FORMAT_CURL_OFF_T " bytes.\n", fsize);
     86 
     87   /* get a FILE * of the same file */
     88   hd_src = fopen(LOCAL_FILE, "rb");
     89 
     90   /* In windows, this will init the winsock stuff */
     91   curl_global_init(CURL_GLOBAL_ALL);
     92 
     93   /* get a curl handle */
     94   curl = curl_easy_init();
     95   if(curl) {
     96     /* build a list of commands to pass to libcurl */
     97     headerlist = curl_slist_append(headerlist, buf_1);
     98     headerlist = curl_slist_append(headerlist, buf_2);
     99 
    100     /* we want to use our own read function */
    101     curl_easy_setopt(curl, CURLOPT_READFUNCTION, read_callback);
    102 
    103     /* enable uploading */
    104     curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
    105 
    106     /* specify target */
    107     curl_easy_setopt(curl, CURLOPT_URL, REMOTE_URL);
    108 
    109     /* pass in that last of FTP commands to run after the transfer */
    110     curl_easy_setopt(curl, CURLOPT_POSTQUOTE, headerlist);
    111 
    112     /* now specify which file to upload */
    113     curl_easy_setopt(curl, CURLOPT_READDATA, hd_src);
    114 
    115     /* Set the size of the file to upload (optional).  If you give a *_LARGE
    116        option you MUST make sure that the type of the passed-in argument is a
    117        curl_off_t. If you use CURLOPT_INFILESIZE (without _LARGE) you must
    118        make sure that to pass in a type 'long' argument. */
    119     curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
    120                      (curl_off_t)fsize);
    121 
    122     /* Now run off and do what you've been told! */
    123     res = curl_easy_perform(curl);
    124     /* Check for errors */
    125     if(res != CURLE_OK)
    126       fprintf(stderr, "curl_easy_perform() failed: %s\n",
    127               curl_easy_strerror(res));
    128 
    129     /* clean up the FTP commands list */
    130     curl_slist_free_all(headerlist);
    131 
    132     /* always cleanup */
    133     curl_easy_cleanup(curl);
    134   }
    135   fclose(hd_src); /* close the local file */
    136 
    137   curl_global_cleanup();
    138   return 0;
    139 }
    140