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      1 /***************************************************************************
      2  *                                  _   _ ____  _
      3  *  Project                     ___| | | |  _ \| |
      4  *                             / __| | | | |_) | |
      5  *                            | (__| |_| |  _ <| |___
      6  *                             \___|\___/|_| \_\_____|
      7  *
      8  * Copyright (C) 1998 - 2016, 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 /* <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 */
     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 */
     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 */
     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 
     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 
    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