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    1: /***************************************************************************
    2:  *                                  _   _ ____  _
    3:  *  Project                     ___| | | |  _ \| |
    4:  *                             / __| | | | |_) | |
    5:  *                            | (__| |_| |  _ <| |___
    6:  *                             \___|\___/|_| \_\_____|
    7:  *
    8:  * Copyright (C) 1998 - 2019, 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: #include <stdio.h>
   23: #include <string.h>
   24: 
   25: #include <curl/curl.h>
   26: 
   27: /* <DESC>
   28:  * Checks a single file's size and mtime from an FTP server.
   29:  * </DESC>
   30:  */
   31: 
   32: static size_t throw_away(void *ptr, size_t size, size_t nmemb, void *data)
   33: {
   34:   (void)ptr;
   35:   (void)data;
   36:   /* we are not interested in the headers itself,
   37:      so we only return the size we would have saved ... */
   38:   return (size_t)(size * nmemb);
   39: }
   40: 
   41: int main(void)
   42: {
   43:   char ftpurl[] = "ftp://ftp.example.com/gnu/binutils/binutils-2.19.1.tar.bz2";
   44:   CURL *curl;
   45:   CURLcode res;
   46:   long filetime = -1;
   47:   double filesize = 0.0;
   48:   const char *filename = strrchr(ftpurl, '/') + 1;
   49: 
   50:   curl_global_init(CURL_GLOBAL_DEFAULT);
   51: 
   52:   curl = curl_easy_init();
   53:   if(curl) {
   54:     curl_easy_setopt(curl, CURLOPT_URL, ftpurl);
   55:     /* No download if the file */
   56:     curl_easy_setopt(curl, CURLOPT_NOBODY, 1L);
   57:     /* Ask for filetime */
   58:     curl_easy_setopt(curl, CURLOPT_FILETIME, 1L);
   59:     curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, throw_away);
   60:     curl_easy_setopt(curl, CURLOPT_HEADER, 0L);
   61:     /* Switch on full protocol/debug output */
   62:     /* curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); */
   63: 
   64:     res = curl_easy_perform(curl);
   65: 
   66:     if(CURLE_OK == res) {
   67:       /* https://curl.haxx.se/libcurl/c/curl_easy_getinfo.html */
   68:       res = curl_easy_getinfo(curl, CURLINFO_FILETIME, &filetime);
   69:       if((CURLE_OK == res) && (filetime >= 0)) {
   70:         time_t file_time = (time_t)filetime;
   71:         printf("filetime %s: %s", filename, ctime(&file_time));
   72:       }
   73:       res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD,
   74:                               &filesize);
   75:       if((CURLE_OK == res) && (filesize>0.0))
   76:         printf("filesize %s: %0.0f bytes\n", filename, filesize);
   77:     }
   78:     else {
   79:       /* we failed */
   80:       fprintf(stderr, "curl told us %d\n", res);
   81:     }
   82: 
   83:     /* always cleanup */
   84:     curl_easy_cleanup(curl);
   85:   }
   86: 
   87:   curl_global_cleanup();
   88: 
   89:   return 0;
   90: }