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/*
This file is part of libmicrohttpd
Copyright (C) 2007 Christian Grothoff (and other contributing authors)
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 fileserver_example_dirs.c
* @brief example for how to use libmicrohttpd to serve files (with directory support)
* @author Christian Grothoff
*/
#include "platform.h"
#include <dirent.h>
#include <microhttpd.h>
#include <unistd.h>
#define PAGE \
"<html><head><title>File not found</title></head><body>File not found</body></html>"
static ssize_t
file_reader (void *cls, uint64_t pos, char *buf, size_t max)
{
FILE *file = cls;
(void) fseek (file, pos, SEEK_SET);
return fread (buf, 1, max, file);
}
static void
file_free_callback (void *cls)
{
FILE *file = cls;
fclose (file);
}
static void
dir_free_callback (void *cls)
{
DIR *dir = cls;
if (dir != NULL)
closedir (dir);
}
static ssize_t
dir_reader (void *cls, uint64_t pos, char *buf, size_t max)
{
DIR *dir = cls;
struct dirent *e;
if (max < 512)
return 0;
(void) pos; /* 'pos' is ignored as function return next one single entry per call. */
do
{
e = readdir (dir);
if (e == NULL)
return MHD_CONTENT_READER_END_OF_STREAM;
} while (e->d_name[0] == '.');
return snprintf (buf, max,
"<a href=\"/%s\">%s</a><br>",
e->d_name,
e->d_name);
}
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;
FILE *file;
int fd;
DIR *dir;
struct stat buf;
char emsg[1024];
(void) cls; /* 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, MHD_HTTP_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 */
file = fopen (&url[1], "rb");
if (NULL != file)
{
fd = fileno (file);
if (-1 == fd)
{
(void) fclose (file);
return MHD_NO; /* internal error */
}
if ( (0 != fstat (fd, &buf)) ||
(! S_ISREG (buf.st_mode)) )
{
/* not a regular file, refuse to serve */
fclose (file);
file = NULL;
}
}
if (NULL == file)
{
dir = opendir (".");
if (NULL == dir)
{
/* most likely cause: more concurrent requests than
available file descriptors / 2 */
snprintf (emsg,
sizeof (emsg),
"Failed to open directory `.': %s\n",
strerror (errno));
response = MHD_create_response_from_buffer (strlen (emsg),
emsg,
MHD_RESPMEM_MUST_COPY);
if (NULL == response)
return MHD_NO;
ret = MHD_queue_response (connection,
MHD_HTTP_SERVICE_UNAVAILABLE,
response);
MHD_destroy_response (response);
}
else
{
response = MHD_create_response_from_callback (MHD_SIZE_UNKNOWN,
32 * 1024,
&dir_reader,
dir,
&dir_free_callback);
if (NULL == response)
{
closedir (dir);
return MHD_NO;
}
ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
MHD_destroy_response (response);
}
}
else
{
response = MHD_create_response_from_callback (buf.st_size, 32 * 1024, /* 32k page size */
&file_reader,
file,
&file_free_callback);
if (NULL == response)
{
fclose (file);
return MHD_NO;
}
ret = MHD_queue_response (connection, MHD_HTTP_OK, response);
MHD_destroy_response (response);
}
return ret;
}
int
main (int argc, char *const *argv)
{
struct MHD_Daemon *d;
if (argc != 2)
{
printf ("%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,
atoi (argv[1]),
NULL, NULL, &ahc_echo, PAGE, MHD_OPTION_END);
if (NULL == d)
return 1;
(void) getc (stdin);
MHD_stop_daemon (d);
return 0;
}
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