libmicrohttpd/src/examples/authorization_example.c

/*
     This file is part of libmicrohttpd
     Copyright (C) 2008 Christian Grothoff (and other contributing authors)
     Copyright (C) 2014-2022 Evgeny Grin (Karlson2k)

     This library is free software; you can redistribute it and/or
     modify it under the terms of the GNU Lesser General Public
     License as published by the Free Software Foundation; either
     version 2.1 of the License, or (at your option) any later version.

     This library is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     Lesser General Public License for more details.

     You should have received a copy of the GNU Lesser General Public
     License along with this library; if not, write to the Free Software
     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
*/

/**
 * @file authorization_example.c
 * @brief example for how to use libmicrohttpd with HTTP authentication
 * @author Christian Grothoff
 * @author Karlson2k (Evgeny Grin)
 */

#include "platform.h"
#include <microhttpd.h>
#ifdef _WIN32
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN 1
#endif /* !WIN32_LEAN_AND_MEAN */
#include <windows.h>
#endif

#define PAGE \
  "<html><head><title>libmicrohttpd demo</title></head><body>libmicrohttpd demo</body></html>"

#define DENIED \
  "<html><head><title>Access denied</title></head><body>Access denied</body></html>"


static enum MHD_Result
ahc_echo (void *cls,
          struct MHD_Connection *connection,
          const char *url,
          const char *method,
          const char *version,
          const char *upload_data, size_t *upload_data_size, void **req_cls)
{
  static int aptr;
  struct MHD_Response *response;
  enum MHD_Result ret;
  struct MHD_BasicAuthInfo *auth_info;
  int fail;
  (void) cls;               /* Unused. Silent compiler warning. */
  (void) url;               /* Unused. Silent compiler warning. */
  (void) version;           /* Unused. Silent compiler warning. */
  (void) upload_data;       /* Unused. Silent compiler warning. */
  (void) upload_data_size;  /* Unused. Silent compiler warning. */

  if (0 != strcmp (method, "GET"))
    return MHD_NO;              /* unexpected method */
  if (&aptr != *req_cls)
  {
    /* do never respond on first call */
    *req_cls = &aptr;
    return MHD_YES;
  }
  *req_cls = NULL;                  /* reset when done */

  /* require: "Aladdin" with password "open sesame" */
  auth_info = MHD_basic_auth_get_username_password3 (connection);
  fail = ( (NULL == auth_info) ||
           (strlen ("Aladdin") != auth_info->username_len) ||
           (0 != memcmp (auth_info->username, "Aladdin",
                         auth_info->username_len)) ||
           /* The next check against NULL is optional,
            * if 'password' is NULL then 'password_len' is always zero. */
           (NULL == auth_info->password) ||
           (strlen ("open sesame") != auth_info->password_len) ||
           (0 != memcmp (auth_info->password, "open sesame",
                         auth_info->password_len)) );
  if (fail)
  {
    response =
      MHD_create_response_from_buffer_static (strlen (DENIED),
                                              (const void *) DENIED);
    ret = MHD_queue_basic_auth_required_response3 (connection,
                                                   "TestRealm",
                                                   MHD_NO,
                                                   response);
  }
  else
  {
    response =
      MHD_create_response_from_buffer_static (strlen (PAGE),
                                              (const void *) PAGE);
    ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
  }
  if (NULL != auth_info)
    MHD_free (auth_info);
  MHD_destroy_response (response);
  return ret;
}


int
main (int argc, char *const *argv)
{
  struct MHD_Daemon *d;
  unsigned int port;

  if ( (argc != 2) ||
       (1 != sscanf (argv[1], "%u", &port)) ||
       (65535 < port) )
  {
    fprintf (stderr,
             "%s PORT\n", argv[0]);
    return 1;
  }

  d = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION
                        | MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_ERROR_LOG,
                        (uint16_t) port,
                        NULL, NULL, &ahc_echo, NULL, MHD_OPTION_END);
  if (d == NULL)
    return 1;
  fprintf (stderr, "HTTP server running. Press ENTER to stop the server.\n");
  (void) getc (stdin);
  MHD_stop_daemon (d);
  return 0;
}