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
32static ssize_t
33file_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
41static void
42free_callback (void *cls)
43{
44  FILE *file = cls;
45  fclose (file);
46}
47
48static int
49ahc_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
101int
102main (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