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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.c
* @brief minimal example for how to use libmicrohttpd to serve files
* @author Christian Grothoff
*/
#include "platform.h"
#include <microhttpd.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif /* HAVE_SYS_STAT_H */
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif /* HAVE_FCNTL_H */
#define PAGE "<html><head><title>File not found</title></head><body>File not found</body></html>"
#ifndef S_ISREG
#define S_ISREG(x) (S_IFREG == (x & S_IFREG))
#endif /* S_ISREG */
static int
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 **ptr)
{
static int aptr;
struct MHD_Response *response;
int ret;
int fd;
struct stat buf;
(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)) &&
(0 != strcmp (method, MHD_HTTP_METHOD_HEAD)) )
return MHD_NO; /* unexpected method */
if (&aptr != *ptr)
{
/* do never respond on first call */
*ptr = &aptr;
return MHD_YES;
}
*ptr = NULL; /* reset when done */
/* WARNING: direct usage of url as filename is for example only!
* NEVER pass received data directly as parameter to file manipulation
* functions. Always check validity of data before using.
*/
if (NULL != strstr(url, "../")) /* Very simplified check! */
fd = -1; /* Do not allow usage of parent directories. */
else
fd = open (url + 1, O_RDONLY);
if (-1 != fd)
{
if ( (0 != fstat (fd, &buf)) ||
(! S_ISREG (buf.st_mode)) )
{
/* not a regular file, refuse to serve */
if (0 != close (fd))
abort ();
fd = -1;
}
}
if (-1 == fd)
{
response = MHD_create_response_from_buffer (strlen (PAGE),
(void *) PAGE,
MHD_RESPMEM_PERSISTENT);
ret = MHD_queue_response (connection, MHD_HTTP_NOT_FOUND, response);
MHD_destroy_response (response);
}
else
{
response = MHD_create_response_from_fd64 (buf.st_size, fd);
if (NULL == response)
{
if (0 != close (fd))
abort ();
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 (d == NULL)
return 1;
(void) getc (stdin);
MHD_stop_daemon (d);
return 0;
}
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