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