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  1.   87598896ac8d29c19650bd12cbba2ccb93c9d95b
  2.   src
  3.   examples
  4.   fileserver_example_dirs.c
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/*
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     This file is part of libmicrohttpd
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     Copyright (C) 2007 Christian Grothoff (and other contributing authors)
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     This library is free software; you can redistribute it and/or
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     modify it under the terms of the GNU Lesser General Public
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     License as published by the Free Software Foundation; either
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     version 2.1 of the License, or (at your option) any later version.
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     This library is distributed in the hope that it will be useful,
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     but WITHOUT ANY WARRANTY; without even the implied warranty of
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     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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     Lesser General Public License for more details.
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     You should have received a copy of the GNU Lesser General Public
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     License along with this library; if not, write to the Free Software
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     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
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*/
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/**
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 * @file fileserver_example_dirs.c
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 * @brief example for how to use libmicrohttpd to serve files (with directory support)
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 * @author Christian Grothoff
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 */
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#include "platform.h"
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#include <dirent.h>
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#include <microhttpd.h>
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#include <unistd.h>
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#define PAGE "<html><head><title>File not found</title></head><body>File not found</body></html>"
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static ssize_t
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file_reader (void *cls, uint64_t pos, char *buf, size_t max)
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{
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  FILE *file = cls;
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  (void) fseek (file, pos, SEEK_SET);
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  return fread (buf, 1, max, file);
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}
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static void
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file_free_callback (void *cls)
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{
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  FILE *file = cls;
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  fclose (file);
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}
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static void
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dir_free_callback (void *cls)
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{
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  DIR *dir = cls;
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  if (dir != NULL)
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    closedir (dir);
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}
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static ssize_t
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dir_reader (void *cls, uint64_t pos, char *buf, size_t max)
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{
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  DIR *dir = cls;
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  struct dirent *e;
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  if (max < 512)
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    return 0;
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  (void)pos; /* 'pos' is ignored as function return next one single entry per call. */
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  do
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    {
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      e = readdir (dir);
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      if (e == NULL)
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        return MHD_CONTENT_READER_END_OF_STREAM;
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  } while (e->d_name[0] == '.');
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  return snprintf (buf, max,
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		   "%s
",
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		   e->d_name,
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		   e->d_name);
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}
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static int
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ahc_echo (void *cls,
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          struct MHD_Connection *connection,
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          const char *url,
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          const char *method,
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          const char *version,
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          const char *upload_data,
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	  size_t *upload_data_size, void **ptr)
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{
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  static int aptr;
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  struct MHD_Response *response;
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  int ret;
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  FILE *file;
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  int fd;
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  DIR *dir;
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  struct stat buf;
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  char emsg[1024];
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  (void)cls;               /* Unused. Silent compiler warning. */
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  (void)version;           /* Unused. Silent compiler warning. */
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  (void)upload_data;       /* Unused. Silent compiler warning. */
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  (void)upload_data_size;  /* Unused. Silent compiler warning. */
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  if (0 != strcmp (method, MHD_HTTP_METHOD_GET))
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    return MHD_NO;              /* unexpected method */
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  if (&aptr != *ptr)
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    {
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      /* do never respond on first call */
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      *ptr = &apt;;
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      return MHD_YES;
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    }
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  *ptr = NULL;                  /* reset when done */
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  file = fopen (&url[1], "rb");
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  if (NULL != file)
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    {
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      fd = fileno (file);
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      if (-1 == fd)
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        {
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          (void) fclose (file);
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          return MHD_NO; /* internal error */
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        }
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      if ( (0 != fstat (fd, &buf)) ||
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           (! S_ISREG (buf.st_mode)) )
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        {
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          /* not a regular file, refuse to serve */
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          fclose (file);
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          file = NULL;
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        }
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    }
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  if (NULL == file)
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    {
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      dir = opendir (".");
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      if (NULL == dir)
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	{
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	  /* most likely cause: more concurrent requests than
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	     available file descriptors / 2 */
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	  snprintf (emsg,
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		    sizeof (emsg),
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		    "Failed to open directory `.': %s\n",
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		    strerror (errno));
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	  response = MHD_create_response_from_buffer (strlen (emsg),
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						      emsg,
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						      MHD_RESPMEM_MUST_COPY);
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	  if (NULL == response)
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	    return MHD_NO;
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	  ret = MHD_queue_response (connection,
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                                    MHD_HTTP_SERVICE_UNAVAILABLE,
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                                    response);
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	  MHD_destroy_response (response);
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	}
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      else
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	{
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	  response = MHD_create_response_from_callback (MHD_SIZE_UNKNOWN,
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							32 * 1024,
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							&dir_reader,
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							dir,
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							&dir_free_callback);
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	  if (NULL == response)
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	    {
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	      closedir (dir);
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	      return MHD_NO;
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	    }
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	  ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
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	  MHD_destroy_response (response);
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	}
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    }
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  else
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    {
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      response = MHD_create_response_from_callback (buf.st_size, 32 * 1024,     /* 32k page size */
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                                                    &file_reader,
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                                                    file,
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                                                    &file_free_callback);
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      if (NULL == response)
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	{
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	  fclose (file);
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	  return MHD_NO;
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	}
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      ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
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      MHD_destroy_response (response);
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    }
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  return ret;
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}
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int
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main (int argc, char *const *argv)
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{
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  struct MHD_Daemon *d;
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  if (argc != 2)
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    {
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      printf ("%s PORT\n", argv[0]);
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      return 1;
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    }
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  d = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION | MHD_USE_INTERNAL_POLLING_THREAD | MHD_USE_ERROR_LOG,
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                        atoi (argv[1]),
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                        NULL, NULL, &ahc_echo, PAGE, MHD_OPTION_END);
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  if (NULL == d)
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    return 1;
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  (void) getc (stdin);
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  MHD_stop_daemon (d);
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  return 0;
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}

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