/*
* libwebsockets-test-client - libwebsockets test implementation
*
* Copyright (C) 2011 Andy Green <andy@warmcat.com>
*
* 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:
* version 2.1 of the License.
*
* 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
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <string.h>
#include "../lib/libwebsockets.h"
static unsigned int opts;
static int was_closed;
static int deny_deflate;
static int deny_mux;
static struct libwebsocket *wsi_mirror;
/*
* This demo shows how to connect multiple websockets simultaneously to a
* websocket server (there is no restriction on their having to be the same
* server just it simplifies the demo).
*
* dumb-increment-protocol: we connect to the server and print the number
* we are given
*
* lws-mirror-protocol: draws random circles, which are mirrored on to every
* client (see them being drawn in every browser
* session also using the test server)
*/
enum demo_protocols {
PROTOCOL_DUMB_INCREMENT,
PROTOCOL_LWS_MIRROR,
/* always last */
DEMO_PROTOCOL_COUNT
};
/* dumb_increment protocol */
static int
callback_dumb_increment(struct libwebsocket_context * this,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason,
void *user, void *in, size_t len)
{
switch (reason) {
case LWS_CALLBACK_CLOSED:
fprintf(stderr, "LWS_CALLBACK_CLOSED\n");
was_closed = 1;
break;
case LWS_CALLBACK_CLIENT_RECEIVE:
((char *)in)[len] = '\0';
fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in);
break;
/* because we are protocols[0] ... */
case LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED:
if ((strcmp(in, "deflate-stream") == 0) && deny_deflate) {
fprintf(stderr, "denied deflate-stream extension\n");
return 1;
}
if ((strcmp(in, "x-google-mux") == 0) && deny_mux) {
fprintf(stderr, "denied x-google-mux extension\n");
return 1;
}
break;
default:
break;
}
return 0;
}
/* lws-mirror_protocol */
static int
callback_lws_mirror(struct libwebsocket_context * this,
struct libwebsocket *wsi,
enum libwebsocket_callback_reasons reason,
void *user, void *in, size_t len)
{
unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 4096 +
LWS_SEND_BUFFER_POST_PADDING];
int l;
switch (reason) {
case LWS_CALLBACK_CLOSED:
fprintf(stderr, "mirror: LWS_CALLBACK_CLOSED\n");
wsi_mirror = NULL;
break;
case LWS_CALLBACK_CLIENT_ESTABLISHED:
/*
* start the ball rolling,
* LWS_CALLBACK_CLIENT_WRITEABLE will come next service
*/
libwebsocket_callback_on_writable(this, wsi);
break;
case LWS_CALLBACK_CLIENT_RECEIVE:
/* fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in); */
break;
case LWS_CALLBACK_CLIENT_WRITEABLE:
l = sprintf((char *)&buf[LWS_SEND_BUFFER_PRE_PADDING],
"c #%06X %d %d %d;",
(int)random() & 0xffffff,
(int)random() % 500,
(int)random() % 250,
(int)random() % 24);
libwebsocket_write(wsi,
&buf[LWS_SEND_BUFFER_PRE_PADDING], l, opts | LWS_WRITE_TEXT);
/* get notified as soon as we can write again */
libwebsocket_callback_on_writable(this, wsi);
/*
* without at least this delay, we choke the browser
* and the connection stalls, despite we now take care about
* flow control
*/
usleep(200);
break;
default:
break;
}
return 0;
}
/* list of supported protocols and callbacks */
static struct libwebsocket_protocols protocols[] = {
{
"dumb-increment-protocol",
callback_dumb_increment,
0,
},
{
"lws-mirror-protocol",
callback_lws_mirror,
0,
},
{ /* end of list */
NULL,
NULL,
0
}
};
static struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "port", required_argument, NULL, 'p' },
{ "ssl", no_argument, NULL, 's' },
{ "killmask", no_argument, NULL, 'k' },
{ "version", required_argument, NULL, 'v' },
{ "undeflated", no_argument, NULL, 'u' },
{ "nomux", no_argument, NULL, 'n' },
{ NULL, 0, 0, 0 }
};
int main(int argc, char **argv)
{
int n = 0;
int port = 7681;
int use_ssl = 0;
struct libwebsocket_context *context;
const char *address;
struct libwebsocket *wsi_dumb;
int ietf_version = -1; /* latest */
int mirror_lifetime = 0;
fprintf(stderr, "libwebsockets test client\n"
"(C) Copyright 2010 Andy Green <andy@warmcat.com> "
"licensed under LGPL2.1\n");
if (argc < 2)
goto usage;
while (n >= 0) {
n = getopt_long(argc, argv, "nuv:khsp:", options, NULL);
if (n < 0)
continue;
switch (n) {
case 's':
use_ssl = 2; /* 2 = allow selfsigned */
break;
case 'p':
port = atoi(optarg);
break;
case 'k':
opts = LWS_WRITE_CLIENT_IGNORE_XOR_MASK;
break;
case 'v':
ietf_version = atoi(optarg);
break;
case 'u':
deny_deflate = 1;
break;
case 'n':
deny_mux = 1;
break;
case 'h':
goto usage;
}
}
if (optind >= argc)
goto usage;
address = argv[optind];
/*
* create the websockets context. This tracks open connections and
* knows how to route any traffic and which protocol version to use,
* and if each connection is client or server side.
*
* For this client-only demo, we tell it to not listen on any port.
*/
context = libwebsocket_create_context(CONTEXT_PORT_NO_LISTEN, NULL,
protocols, libwebsocket_internal_extensions,
NULL, NULL, -1, -1, 0);
if (context == NULL) {
fprintf(stderr, "Creating libwebsocket context failed\n");
return 1;
}
/* create a client websocket using dumb increment protocol */
wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl,
"/", argv[optind], argv[optind],
protocols[PROTOCOL_DUMB_INCREMENT].name, ietf_version);
if (wsi_dumb == NULL) {
fprintf(stderr, "libwebsocket dumb connect failed\n");
return -1;
}
fprintf(stderr, "Websocket connections opened\n");
/*
* sit there servicing the websocket context to handle incoming
* packets, and drawing random circles on the mirror protocol websocket
*/
n = 0;
while (n >= 0 && !was_closed) {
n = libwebsocket_service(context, 1000);
if (wsi_mirror == NULL) {
/* create a client websocket using mirror protocol */
wsi_mirror = libwebsocket_client_connect(context, address, port,
use_ssl, "/", argv[optind], argv[optind],
protocols[PROTOCOL_LWS_MIRROR].name, ietf_version);
if (wsi_mirror == NULL) {
fprintf(stderr, "libwebsocket dumb connect failed\n");
return -1;
}
mirror_lifetime = 10 + (random() & 1023);
fprintf(stderr, "opened mirror connection with %d lifetime\n", mirror_lifetime);
} else {
mirror_lifetime--;
if (mirror_lifetime == 0) {
fprintf(stderr, "closing mirror session\n");
libwebsocket_close_and_free_session(context,
wsi_mirror, LWS_CLOSE_STATUS_GOINGAWAY);
/*
* wsi_mirror will get set to NULL in
* callback when close completes
*/
}
}
}
fprintf(stderr, "Exiting\n");
libwebsocket_context_destroy(context);
return 0;
usage:
fprintf(stderr, "Usage: libwebsockets-test-client "
"<server address> [--port=<p>] "
"[--ssl] [-k] [-v <ver>]\n");
return 1;
}