Home | History | Annotate | Download | only in examples 
      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 /* <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 }
    162