1 /* 2 This file is part of libmicrohttpd 3 Copyright (C) 2007 Christian Grothoff (and other contributing authors) 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 of the License, or (at your option) any later version. 9 10 This library is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with this library; if not, write to the Free Software 17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 18 */ 19 20 /** 21 * @file fileserver_example.c 22 * @brief minimal example for how to use libmicrohttpd to serve files 23 * @author Christian Grothoff 24 */ 25 26 #include "platform.h" 27 #include <microhttpd.h> 28 #include <unistd.h> 29 30 #define PAGE "<html><head><title>File not found</title></head><body>File not found</body></html>" 31 32 static ssize_t 33 file_reader (void *cls, uint64_t pos, char *buf, size_t max) 34 { 35 FILE *file = cls; 36 37 (void) fseek (file, pos, SEEK_SET); 38 return fread (buf, 1, max, file); 39 } 40 41 static void 42 free_callback (void *cls) 43 { 44 FILE *file = cls; 45 fclose (file); 46 } 47 48 static int 49 ahc_echo (void *cls, 50 struct MHD_Connection *connection, 51 const char *url, 52 const char *method, 53 const char *version, 54 const char *upload_data, 55 size_t *upload_data_size, void **ptr) 56 { 57 static int aptr; 58 struct MHD_Response *response; 59 int ret; 60 FILE *file; 61 struct stat buf; 62 63 if (0 != strcmp (method, MHD_HTTP_METHOD_GET)) 64 return MHD_NO; /* unexpected method */ 65 if (&aptr != *ptr) 66 { 67 /* do never respond on first call */ 68 *ptr = &aptr; 69 return MHD_YES; 70 } 71 *ptr = NULL; /* reset when done */ 72 if (0 == stat (&url[1], &buf)) 73 file = fopen (&url[1], "rb"); 74 else 75 file = NULL; 76 if (file == NULL) 77 { 78 response = MHD_create_response_from_buffer (strlen (PAGE), 79 (void *) PAGE, 80 MHD_RESPMEM_PERSISTENT); 81 ret = MHD_queue_response (connection, MHD_HTTP_NOT_FOUND, response); 82 MHD_destroy_response (response); 83 } 84 else 85 { 86 response = MHD_create_response_from_callback (buf.st_size, 32 * 1024, /* 32k page size */ 87 &file_reader, 88 file, 89 &free_callback); 90 if (response == NULL) 91 { 92 fclose (file); 93 return MHD_NO; 94 } 95 ret = MHD_queue_response (connection, MHD_HTTP_OK, response); 96 MHD_destroy_response (response); 97 } 98 return ret; 99 } 100 101 int 102 main (int argc, char *const *argv) 103 { 104 struct MHD_Daemon *d; 105 106 if (argc != 2) 107 { 108 printf ("%s PORT\n", argv[0]); 109 return 1; 110 } 111 d = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION | MHD_USE_DEBUG, 112 atoi (argv[1]), 113 NULL, NULL, &ahc_echo, PAGE, MHD_OPTION_END); 114 if (d == NULL) 115 return 1; 116 (void) getc (stdin); 117 MHD_stop_daemon (d); 118 return 0; 119 } 120
