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/*
This file is part of libmicrohttpd
Copyright (C) 2021 David Gausmann
libmicrohttpd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
libmicrohttpd 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with libmicrohttpd; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
/**
* @file test_websocket_browser.c
* @brief Testcase for WebSocket decoding/encoding with external browser
* @author David Gausmann
*/
#include <sys/types.h>
#ifndef _WIN32
#include <sys/select.h>
#include <sys/socket.h>
#include <fcntl.h>
#else
#include <winsock2.h>
#endif
#include "microhttpd.h"
#include "microhttpd_ws.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <time.h>
#include <errno.h>
#define PORT 80
#define PAGE \
"<!DOCTYPE html>\n" \
"<html>\n" \
"<head>\n" \
"<meta charset=\"UTF-8\">\n" \
"<title>Websocket External Test with Webbrowser</title>\n" \
"<script>\n" \
"\n" \
"let current_mode = 0;\n" \
"let current_step = 0;\n" \
"let sent_payload = null;\n" \
"let charset = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_!@%&/\\\\';\n" \
"let step_to_bytes = [ 0, 1, 2, 3, 122, 123, 124, 125, 126, 127, 128, 32766, 32767, 32768, 65534, 65535, 65536, 65537, 1048576, 10485760 ];\n" \
"let url = 'ws' + (window.location.protocol === 'https:' ? 's' : '')" \
" + '://' +\n" \
" window.location.host + '/websocket';\n" \
"let socket = null;\n" \
"\n" \
"window.onload = function (event) {\n" \
" if (!window.WebSocket) {\n" \
" document.write ('ERROR: The WebSocket class is not supported by your browser.<br>');\n" \
" }\n" \
" if (!window.fetch) {\n" \
" document.write ('ERROR: The fetch-API is not supported by your browser.<br>');\n" \
" }\n" \
" document.write ('Starting tests.<br>');\n" \
" runTest ();\n" \
"}\n" \
"\n" \
"function runTest () {\n" \
" switch (current_mode) {\n" \
" case 0:\n" \
" document.write ('TEXT');\n" \
" break;\n" \
" case 1:\n" \
" document.write ('BINARY');\n" \
" break;\n" \
" }\n" \
" document.write (', ' + step_to_bytes[current_step] + ' Bytes: ');\n" \
" socket = new WebSocket(url);\n" \
" socket.binaryType = 'arraybuffer';\n" \
" socket.onopen = function (event) {\n" \
" switch (current_mode) {\n" \
" case 0:\n" \
" sent_payload = randomText (step_to_bytes[current_step]);\n" \
" socket.send (sent_payload);\n" \
" break;\n" \
" case 1:\n" \
" sent_payload = randomBinary (step_to_bytes[current_step]);\n" \
" socket.send (sent_payload);\n" \
" break;\n" \
" }\n" \
" }\n" \
"\n" \
" socket.onclose = function (event) {\n" \
" socket.onmessage = null;\n" \
" socket.onclose = null;\n" \
" socket.onerror = null;\n" \
" document.write ('CLOSED unexpectedly.<br>');\n" \
" notifyError ();\n" \
" }\n" \
"\n" \
" socket.onerror = function (event) {\n" \
" socket.onmessage = null;\n" \
" socket.onclose = null;\n" \
" socket.onerror = null;\n" \
" document.write ('ERROR.<br>');\n" \
" notifyError ();\n" \
" }\n" \
"\n" \
" socket.onmessage = async function (event) {\n" \
" if (compareData (event.data, sent_payload)) {\n" \
" document.write ('SUCCESS.<br>');\n" \
" socket.onmessage = null;\n" \
" socket.onclose = null;\n" \
" socket.onerror = null;\n" \
" socket.close();\n" \
" socket = null;\n" \
" if (step_to_bytes.length <= ++current_step) {\n" \
" current_step = 0;\n" \
" if (1 < ++current_mode) {\n" \
" document.write ('FINISHED ALL TESTS.<br>');\n" \
" return;\n" \
" }\n" \
" }\n" \
" runTest ();\n" \
" }" \
" }\n" \
"}\n" \
"\n" \
"function compareData (data, data2) {\n" \
" if (typeof (data) === 'string' && typeof (data2) === 'string') {\n" \
" return (data === data2); \n" \
" } \n" \
" else if ((data instanceof ArrayBuffer) && (data2 instanceof ArrayBuffer)) {\n" \
" let view1 = new Uint8Array (data);\n" \
" let view2 = new Uint8Array (data2);\n" \
" if (view1.length != view2.length)\n" \
" return false;\n" \
" for (let i = 0; i < view1.length; ++i) {\n" \
" if (view1[i] !== view2[i])\n" \
" return false;\n" \
" }\n" \
" return true;\n" \
" }\n" \
" else\n" \
" {\n" \
" return false;\n" \
" }\n" \
"}\n" \
"\n" \
"function randomText (length) {\n" \
" let result = new Array (length);\n" \
" for (let i = 0; i < length; ++i)\n" \
" result [i] = charset [~~(Math.random () * charset.length)];\n" \
" return result.join ('');\n" \
"}\n" \
"\n" \
"function randomBinary (length) {\n" \
" let buffer = new ArrayBuffer (length);\n" \
" let view = new Uint8Array (buffer);\n" \
" for (let i = 0; i < length; ++i)\n" \
" view [i] = ~~(Math.random () * 256);\n" \
" return buffer;\n" \
"}\n" \
"\n" \
"function notifyError () {\n" \
" fetch('error/' + (0 == current_mode ? 'text' : 'binary') + '/' + step_to_bytes[current_step]);\n" \
"}\n" \
"\n" \
"</script>\n" \
"</head>\n" \
"<body>\n" \
"</body>\n" \
"</html>"
#define PAGE_NOT_FOUND \
"404 Not Found"
#define PAGE_INVALID_WEBSOCKET_REQUEST \
"Invalid WebSocket request!"
static void
send_all (MHD_socket fd,
const char *buf,
size_t len);
static void
make_blocking (MHD_socket fd);
static void
upgrade_handler (void *cls,
struct MHD_Connection *connection,
void *req_cls,
const char *extra_in,
size_t extra_in_size,
MHD_socket fd,
struct MHD_UpgradeResponseHandle *urh)
{
/* make the socket blocking (operating-system-dependent code) */
make_blocking (fd);
/* create a websocket stream for this connection */
struct MHD_WebSocketStream *ws;
int result = MHD_websocket_stream_init (&ws,
0,
0);
if (0 != result)
{
/* Couldn't create the websocket stream.
* So we close the socket and leave
*/
MHD_upgrade_action (urh,
MHD_UPGRADE_ACTION_CLOSE);
return;
}
/* Let's wait for incoming data */
const size_t buf_len = 256;
char buf[buf_len];
ssize_t got;
while (MHD_WEBSOCKET_VALIDITY_VALID == MHD_websocket_stream_is_valid (ws))
{
got = recv (fd,
buf,
sizeof (buf),
0);
if (0 >= got)
{
/* the TCP/IP socket has been closed */
fprintf (stderr,
"Error (The socket has been closed unexpectedly)\n");
break;
}
/* parse the entire received data */
size_t buf_offset = 0;
while (buf_offset < (size_t) got)
{
size_t new_offset = 0;
char *payload_data = NULL;
size_t payload_len = 0;
char *frame_data = NULL;
size_t frame_len = 0;
int status = MHD_websocket_decode (ws,
buf + buf_offset,
((size_t) got) - buf_offset,
&new_offset,
&payload_data,
&payload_len);
if (0 > status)
{
/* an error occurred and the connection must be closed */
printf ("Decoding failed: status=%d, passed=%u\n", status,
((size_t) got) - buf_offset);
if (NULL != payload_data)
{
MHD_websocket_free (ws, payload_data);
}
break;
}
else
{
buf_offset += new_offset;
if (0 < status)
{
/* the frame is complete */
printf (
"Decoding succeeded: type=%d, passed=%u, parsed=%u, payload_len=%d\n",
status, ((size_t) got) - buf_offset, new_offset, payload_len);
switch (status)
{
case MHD_WEBSOCKET_STATUS_TEXT_FRAME:
case MHD_WEBSOCKET_STATUS_BINARY_FRAME:
/* The client has sent some data. */
if ((NULL != payload_data) || (0 == payload_len))
{
/* Send the received data back to the client */
if (MHD_WEBSOCKET_STATUS_TEXT_FRAME == status)
{
result = MHD_websocket_encode_text (ws,
payload_data,
payload_len,
0,
&frame_data,
&frame_len,
NULL);
}
else
{
result = MHD_websocket_encode_binary (ws,
payload_data,
payload_len,
0,
&frame_data,
&frame_len);
}
if (0 == result)
{
send_all (fd,
frame_data,
frame_len);
}
}
else
{
/* should never happen */
fprintf (stderr,
"Error (Empty buffer with payload_len != 0)\n");
}
break;
default:
/* Other frame types are ignored
* in this test script.
*/
break;
}
}
if (NULL != payload_data)
{
MHD_websocket_free (ws, payload_data);
}
if (NULL != frame_data)
{
MHD_websocket_free (ws, frame_data);
}
}
}
}
/* free the websocket stream */
MHD_websocket_stream_free (ws);
/* close the socket when it is not needed anymore */
MHD_upgrade_action (urh,
MHD_UPGRADE_ACTION_CLOSE);
}
/* This helper function is used for the case that
* we need to resend some data
*/
static void
send_all (MHD_socket fd,
const char *buf,
size_t len)
{
ssize_t ret;
size_t off;
for (off = 0; off < len; off += ret)
{
ret = send (fd,
&buf[off],
(int) (len - off),
0);
if (0 > ret)
{
if (EAGAIN == errno)
{
ret = 0;
continue;
}
break;
}
if (0 == ret)
break;
}
}
/* This helper function contains operating-system-dependent code and
* is used to make a socket blocking.
*/
static void
make_blocking (MHD_socket fd)
{
#ifndef _WIN32
int flags;
flags = fcntl (fd, F_GETFL);
if (-1 == flags)
return;
if ((flags & ~O_NONBLOCK) != flags)
if (-1 == fcntl (fd, F_SETFL, flags & ~O_NONBLOCK))
abort ();
#else
unsigned long flags = 0;
ioctlsocket (fd, FIONBIO, &flags);
#endif
}
static enum MHD_Result
access_handler (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;
int ret;
(void) cls; /* 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 */
if (0 == strcmp (url, "/"))
{
/* Default page for visiting the server */
struct MHD_Response *response = MHD_create_response_from_buffer (
strlen (PAGE),
PAGE,
MHD_RESPMEM_PERSISTENT);
ret = MHD_queue_response (connection,
MHD_HTTP_OK,
response);
MHD_destroy_response (response);
}
else if (0 == strncmp (url, "/error/", 7))
{
/* Report error */
fprintf (stderr, "Error in test (%s)\n", url + 7);
struct MHD_Response *response = MHD_create_response_from_buffer (
0,
"",
MHD_RESPMEM_PERSISTENT);
ret = MHD_queue_response (connection,
MHD_HTTP_OK,
response);
MHD_destroy_response (response);
}
else if (0 == strcmp (url, "/websocket"))
{
char is_valid = 1;
const char *value = NULL;
char sec_websocket_accept[29];
if (0 != MHD_websocket_check_http_version (version))
{
is_valid = 0;
}
value = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
MHD_HTTP_HEADER_CONNECTION);
if (0 != MHD_websocket_check_connection_header (value))
{
is_valid = 0;
}
value = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
MHD_HTTP_HEADER_UPGRADE);
if (0 != MHD_websocket_check_upgrade_header (value))
{
is_valid = 0;
}
value = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
MHD_HTTP_HEADER_SEC_WEBSOCKET_VERSION);
if (0 != MHD_websocket_check_version_header (value))
{
is_valid = 0;
}
value = MHD_lookup_connection_value (connection,
MHD_HEADER_KIND,
MHD_HTTP_HEADER_SEC_WEBSOCKET_KEY);
if (0 != MHD_websocket_create_accept_header (value, sec_websocket_accept))
{
is_valid = 0;
}
if (1 == is_valid)
{
/* upgrade the connection */
response = MHD_create_response_for_upgrade (&upgrade_handler,
NULL);
MHD_add_response_header (response,
MHD_HTTP_HEADER_CONNECTION,
"Upgrade");
MHD_add_response_header (response,
MHD_HTTP_HEADER_UPGRADE,
"websocket");
MHD_add_response_header (response,
MHD_HTTP_HEADER_SEC_WEBSOCKET_ACCEPT,
sec_websocket_accept);
ret = MHD_queue_response (connection,
MHD_HTTP_SWITCHING_PROTOCOLS,
response);
MHD_destroy_response (response);
}
else
{
/* return error page */
struct MHD_Response *response = MHD_create_response_from_buffer (
strlen (PAGE_INVALID_WEBSOCKET_REQUEST),
PAGE_INVALID_WEBSOCKET_REQUEST,
MHD_RESPMEM_PERSISTENT);
ret = MHD_queue_response (connection,
MHD_HTTP_BAD_REQUEST,
response);
MHD_destroy_response (response);
}
}
else
{
struct MHD_Response *response = MHD_create_response_from_buffer (
strlen (PAGE_NOT_FOUND),
PAGE_NOT_FOUND,
MHD_RESPMEM_PERSISTENT);
ret = MHD_queue_response (connection,
MHD_HTTP_NOT_FOUND,
response);
MHD_destroy_response (response);
}
return ret;
}
int
main (int argc,
char *const *argv)
{
(void) argc; /* Unused. Silent compiler warning. */
(void) argv; /* Unused. Silent compiler warning. */
struct MHD_Daemon *daemon;
daemon = MHD_start_daemon (MHD_USE_INTERNAL_POLLING_THREAD
| MHD_USE_THREAD_PER_CONNECTION
| MHD_ALLOW_UPGRADE
| MHD_USE_ERROR_LOG,
PORT, NULL, NULL,
&access_handler, NULL,
MHD_OPTION_END);
if (NULL == daemon)
{
fprintf (stderr, "Error (Couldn't start daemon for testing)\n");
return 1;
}
printf ("The server is listening now.\n");
printf ("Access the server now with a websocket-capable webbrowser.\n\n");
printf ("Press return to close.\n");
(void) getc (stdin);
MHD_stop_daemon (daemon);
return 0;
}
|
