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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 #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     /* No header output: TODO 14.1 http-style HEAD output for ftp */
     60     curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, throw_away);
     61     curl_easy_setopt(curl, CURLOPT_HEADER, 0L);
     62     /* Switch on full protocol/debug output */
     63     /* curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L); */
     64 
     65     res = curl_easy_perform(curl);
     66 
     67     if(CURLE_OK == res) {
     68       /* https://curl.haxx.se/libcurl/c/curl_easy_getinfo.html */
     69       res = curl_easy_getinfo(curl, CURLINFO_FILETIME, &filetime);
     70       if((CURLE_OK == res) && (filetime >= 0)) {
     71         time_t file_time = (time_t)filetime;
     72         printf("filetime %s: %s", filename, ctime(&file_time));
     73       }
     74       res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD,
     75                               &filesize);
     76       if((CURLE_OK == res) && (filesize>0.0))
     77         printf("filesize %s: %0.0f bytes\n", filename, filesize);
     78     }
     79     else {
     80       /* we failed */
     81       fprintf(stderr, "curl told us %d\n", res);
     82     }
     83 
     84     /* always cleanup */
     85     curl_easy_cleanup(curl);
     86   }
     87 
     88   curl_global_cleanup();
     89 
     90   return 0;
     91 }
     92