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    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2017, 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: #include <curl/curl.h>
   30: 
   31: /* parse headers for Content-Length */
   32: static size_t getcontentlengthfunc(void *ptr, size_t size, size_t nmemb,
   33:                                    void *stream)
   34: {
   35:   int r;
   36:   long len = 0;
   37: 
   38:   r = sscanf(ptr, "Content-Length: %ld\n", &len);
   39:   if(r)
   40:     *((long *) stream) = len;
   41: 
   42:   return size * nmemb;
   43: }
   44: 
   45: /* discard downloaded data */
   46: static size_t discardfunc(void *ptr, size_t size, size_t nmemb, void *stream)
   47: {
   48:   (void)ptr;
   49:   (void)stream;
   50:   return size * nmemb;
   51: }
   52: 
   53: /* read data to upload */
   54: static size_t readfunc(void *ptr, size_t size, size_t nmemb, void *stream)
   55: {
   56:   FILE *f = stream;
   57:   size_t n;
   58: 
   59:   if(ferror(f))
   60:     return CURL_READFUNC_ABORT;
   61: 
   62:   n = fread(ptr, size, nmemb, f) * size;
   63: 
   64:   return n;
   65: }
   66: 
   67: 
   68: static int upload(CURL *curlhandle, const char *remotepath,
   69:                   const char *localpath, long timeout, long tries)
   70: {
   71:   FILE *f;
   72:   long uploaded_len = 0;
   73:   CURLcode r = CURLE_GOT_NOTHING;
   74:   int c;
   75: 
   76:   f = fopen(localpath, "rb");
   77:   if(!f) {
   78:     perror(NULL);
   79:     return 0;
   80:   }
   81: 
   82:   curl_easy_setopt(curlhandle, CURLOPT_UPLOAD, 1L);
   83: 
   84:   curl_easy_setopt(curlhandle, CURLOPT_URL, remotepath);
   85: 
   86:   if(timeout)
   87:     curl_easy_setopt(curlhandle, CURLOPT_FTP_RESPONSE_TIMEOUT, timeout);
   88: 
   89:   curl_easy_setopt(curlhandle, CURLOPT_HEADERFUNCTION, getcontentlengthfunc);
   90:   curl_easy_setopt(curlhandle, CURLOPT_HEADERDATA, &uploaded_len);
   91: 
   92:   curl_easy_setopt(curlhandle, CURLOPT_WRITEFUNCTION, discardfunc);
   93: 
   94:   curl_easy_setopt(curlhandle, CURLOPT_READFUNCTION, readfunc);
   95:   curl_easy_setopt(curlhandle, CURLOPT_READDATA, f);
   96: 
   97:   /* disable passive mode */
   98:   curl_easy_setopt(curlhandle, CURLOPT_FTPPORT, "-");
   99:   curl_easy_setopt(curlhandle, CURLOPT_FTP_CREATE_MISSING_DIRS, 1L);
  100: 
  101:   curl_easy_setopt(curlhandle, CURLOPT_VERBOSE, 1L);
  102: 
  103:   for(c = 0; (r != CURLE_OK) && (c < tries); c++) {
  104:     /* are we resuming? */
  105:     if(c) { /* yes */
  106:       /* determine the length of the file already written */
  107: 
  108:       /*
  109:        * With NOBODY and NOHEADER, libcurl will issue a SIZE
  110:        * command, but the only way to retrieve the result is
  111:        * to parse the returned Content-Length header. Thus,
  112:        * getcontentlengthfunc(). We need discardfunc() above
  113:        * because HEADER will dump the headers to stdout
  114:        * without it.
  115:        */
  116:       curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 1L);
  117:       curl_easy_setopt(curlhandle, CURLOPT_HEADER, 1L);
  118: 
  119:       r = curl_easy_perform(curlhandle);
  120:       if(r != CURLE_OK)
  121:         continue;
  122: 
  123:       curl_easy_setopt(curlhandle, CURLOPT_NOBODY, 0L);
  124:       curl_easy_setopt(curlhandle, CURLOPT_HEADER, 0L);
  125: 
  126:       fseek(f, uploaded_len, SEEK_SET);
  127: 
  128:       curl_easy_setopt(curlhandle, CURLOPT_APPEND, 1L);
  129:     }
  130:     else { /* no */
  131:       curl_easy_setopt(curlhandle, CURLOPT_APPEND, 0L);
  132:     }
  133: 
  134:     r = curl_easy_perform(curlhandle);
  135:   }
  136: 
  137:   fclose(f);
  138: 
  139:   if(r == CURLE_OK)
  140:     return 1;
  141:   else {
  142:     fprintf(stderr, "%s\n", curl_easy_strerror(r));
  143:     return 0;
  144:   }
  145: }
  146: 
  147: int main(void)
  148: {
  149:   CURL *curlhandle = NULL;
  150: 
  151:   curl_global_init(CURL_GLOBAL_ALL);
  152:   curlhandle = curl_easy_init();
  153: 
  154:   upload(curlhandle, "ftp://user:pass@example.com/path/file", "C:\\file",
  155:          0, 3);
  156: 
  157:   curl_easy_cleanup(curlhandle);
  158:   curl_global_cleanup();
  159: 
  160:   return 0;
  161: }