2 * libwebsockets-test-client - libwebsockets test implementation
4 * Copyright (C) 2011 Andy Green <andy@warmcat.com>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation:
9 * version 2.1 of the License.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
28 #include "../lib/libwebsockets.h"
32 * This demo shows how to connect multiple websockets simultaneously to a
33 * websocket server (there is no restriction on their having to be the same
34 * server just it simplifies the demo).
36 * dumb-increment-protocol: we connect to the server and print the number
39 * lws-mirror-protocol: draws random circles, which are mirrored on to every
40 * client (see them being drawn in every browser
41 * session also using the test server)
46 PROTOCOL_DUMB_INCREMENT,
54 /* dumb_increment protocol */
57 callback_dumb_increment(struct libwebsocket *wsi,
58 enum libwebsocket_callback_reasons reason,
59 void *user, void *in, size_t len)
63 case LWS_CALLBACK_CLIENT_RECEIVE:
64 ((char *)in)[len] = '\0';
65 fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in);
76 /* lws-mirror_protocol */
80 callback_lws_mirror(struct libwebsocket *wsi,
81 enum libwebsocket_callback_reasons reason,
82 void *user, void *in, size_t len)
84 unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 4096 +
85 LWS_SEND_BUFFER_POST_PADDING];
90 case LWS_CALLBACK_CLIENT_ESTABLISHED:
93 * start the ball rolling,
94 * LWS_CALLBACK_CLIENT_WRITEABLE will come next service
97 libwebsocket_callback_on_writable(wsi);
100 case LWS_CALLBACK_CLIENT_RECEIVE:
101 /* fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in); */
104 case LWS_CALLBACK_CLIENT_WRITEABLE:
106 l = sprintf((char *)&buf[LWS_SEND_BUFFER_PRE_PADDING],
108 (int)random() & 0xffffff,
113 libwebsocket_write(wsi,
114 &buf[LWS_SEND_BUFFER_PRE_PADDING], l, LWS_WRITE_TEXT);
116 /* get notified as soon as we can write again */
118 libwebsocket_callback_on_writable(wsi);
121 * without at least this delay, we choke the browser
122 * and the connection stalls, despite we now take care about
137 /* list of supported protocols and callbacks */
139 static struct libwebsocket_protocols protocols[] = {
141 [PROTOCOL_DUMB_INCREMENT] = {
142 .name = "dumb-increment-protocol",
143 .callback = callback_dumb_increment,
145 [PROTOCOL_LWS_MIRROR] = {
146 .name = "lws-mirror-protocol",
147 .callback = callback_lws_mirror,
149 [DEMO_PROTOCOL_COUNT] = { /* end of list */
154 static struct option options[] = {
155 { "help", no_argument, NULL, 'h' },
156 { "port", required_argument, NULL, 'p' },
157 { "ssl", no_argument, NULL, 's' },
162 int main(int argc, char **argv)
167 struct libwebsocket_context *context;
168 const char *address = argv[1];
169 struct libwebsocket *wsi_dumb;
170 struct libwebsocket *wsi_mirror;
172 fprintf(stderr, "libwebsockets test client\n"
173 "(C) Copyright 2010 Andy Green <andy@warmcat.com> "
174 "licensed under LGPL2.1\n");
182 n = getopt_long(argc, argv, "hsp:", options, NULL);
187 use_ssl = 2; /* 2 = allow selfsigned */
198 * create the websockets context. This tracks open connections and
199 * knows how to route any traffic and which protocol version to use,
200 * and if each connection is client or server side.
202 * For this client-only demo, we tell it to not listen on any port.
205 context = libwebsocket_create_context(CONTEXT_PORT_NO_LISTEN,
206 protocols, NULL, NULL, -1, -1, 0);
207 if (context == NULL) {
208 fprintf(stderr, "Creating libwebsocket context failed\n");
213 /* create a client websocket using dumb increment protocol */
215 wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl,
216 "/", libwebsocket_canonical_hostname(context), "origin",
217 protocols[PROTOCOL_DUMB_INCREMENT].name);
219 if (wsi_dumb == NULL) {
220 fprintf(stderr, "libwebsocket dumb connect failed\n");
224 /* create a client websocket using mirror protocol */
226 wsi_mirror = libwebsocket_client_connect(context, address, port,
227 use_ssl, "/", libwebsocket_canonical_hostname(context), "origin",
228 protocols[PROTOCOL_LWS_MIRROR].name);
230 if (wsi_mirror == NULL) {
231 fprintf(stderr, "libwebsocket dumb connect failed\n");
235 fprintf(stderr, "Websocket connections opened\n");
238 * sit there servicing the websocket context to handle incoming
239 * packets, and drawing random circles on the mirror protocol websocket
244 n = libwebsocket_service(context, 1000);
246 libwebsocket_context_destroy(context);
251 fprintf(stderr, "Usage: libwebsockets-test-client "
252 "<server address> [--port=<p>] "