test-server/test-client.c

   1 /*
   2  * libwebsockets-test-client - libwebsockets test implementation
   3  *
   4  * Copyright (C) 2011 Andy Green <andy@warmcat.com>
   5  *
   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.
  10  *
  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.
  15  *
  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,
  19  *  MA  02110-1301  USA
  20  */
  21
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <unistd.h>
  25 #include <getopt.h>
  26 #include <string.h>
  27
  28 #include "../lib/libwebsockets.h"
  29
  30 static unsigned int opts;
  31 static int was_closed;
  32 static int deny_deflate;
  33 static struct libwebsocket *wsi_mirror;
  34
  35 /*
  36  * This demo shows how to connect multiple websockets simultaneously to a
  37  * websocket server (there is no restriction on their having to be the same
  38  * server just it simplifies the demo).
  39  *
  40  *  dumb-increment-protocol:  we connect to the server and print the number
  41  *                              we are given
  42  *
  43  *  lws-mirror-protocol: draws random circles, which are mirrored on to every
  44  *                              client (see them being drawn in every browser
  45  *                              session also using the test server)
  46  */
  47
  48 enum demo_protocols {
  49
  50         PROTOCOL_DUMB_INCREMENT,
  51         PROTOCOL_LWS_MIRROR,
  52
  53         /* always last */
  54         DEMO_PROTOCOL_COUNT
  55 };
  56
  57
  58 /* dumb_increment protocol */
  59
  60 static int
  61 callback_dumb_increment(struct libwebsocket_context * this,
  62                         struct libwebsocket *wsi,
  63                         enum libwebsocket_callback_reasons reason,
  64                                                void *user, void *in, size_t len)
  65 {
  66         switch (reason) {
  67
  68         case LWS_CALLBACK_CLOSED:
  69                 fprintf(stderr, "LWS_CALLBACK_CLOSED\n");
  70                 was_closed = 1;
  71                 break;
  72
  73         case LWS_CALLBACK_CLIENT_RECEIVE:
  74                 ((char *)in)[len] = '\0';
  75                 fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in);
  76                 break;
  77
  78         /* because we are protocols[0] ... */
  79
  80         case LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED:
  81                 if (strcmp(in, "deflate-stream") == 0)
  82                         if (deny_deflate) {
  83                                 fprintf(stderr, "denied deflate-stream extension\n");
  84                                 return 1;
  85                         }
  86                 break;
  87
  88         default:
  89                 break;
  90         }
  91
  92         return 0;
  93 }
  94
  95
  96 /* lws-mirror_protocol */
  97
  98
  99 static int
 100 callback_lws_mirror(struct libwebsocket_context * this,
 101                         struct libwebsocket *wsi,
 102                         enum libwebsocket_callback_reasons reason,
 103                                                void *user, void *in, size_t len)
 104 {
 105         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 4096 +
 106                                                   LWS_SEND_BUFFER_POST_PADDING];
 107         int l;
 108
 109         switch (reason) {
 110
 111         case LWS_CALLBACK_CLOSED:
 112                 fprintf(stderr, "mirror: LWS_CALLBACK_CLOSED\n");
 113                 wsi_mirror = NULL;
 114                 break;
 115
 116         case LWS_CALLBACK_CLIENT_ESTABLISHED:
 117
 118                 /*
 119                  * start the ball rolling,
 120                  * LWS_CALLBACK_CLIENT_WRITEABLE will come next service
 121                  */
 122
 123                 libwebsocket_callback_on_writable(this, wsi);
 124                 break;
 125
 126         case LWS_CALLBACK_CLIENT_RECEIVE:
 127 /*              fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in); */
 128                 break;
 129
 130         case LWS_CALLBACK_CLIENT_WRITEABLE:
 131
 132                 l = sprintf((char *)&buf[LWS_SEND_BUFFER_PRE_PADDING],
 133                                         "c #%06X %d %d %d;",
 134                                         (int)random() & 0xffffff,
 135                                         (int)random() % 500,
 136                                         (int)random() % 250,
 137                                         (int)random() % 24);
 138
 139                 libwebsocket_write(wsi,
 140                    &buf[LWS_SEND_BUFFER_PRE_PADDING], l, opts | LWS_WRITE_TEXT);
 141
 142                 /* get notified as soon as we can write again */
 143
 144                 libwebsocket_callback_on_writable(this, wsi);
 145
 146                 /*
 147                  * without at least this delay, we choke the browser
 148                  * and the connection stalls, despite we now take care about
 149                  * flow control
 150                  */
 151
 152                 usleep(200);
 153                 break;
 154
 155         default:
 156                 break;
 157         }
 158
 159         return 0;
 160 }
 161
 162
 163 /* list of supported protocols and callbacks */
 164
 165 static struct libwebsocket_protocols protocols[] = {
 166         {
 167                 "dumb-increment-protocol",
 168                 callback_dumb_increment,
 169                 0,
 170         },
 171         {
 172                 "lws-mirror-protocol",
 173                 callback_lws_mirror,
 174                 0,
 175         },
 176         {  /* end of list */
 177                 NULL,
 178                 NULL,
 179                 0
 180         }
 181 };
 182
 183 static struct option options[] = {
 184         { "help",       no_argument,            NULL, 'h' },
 185         { "port",       required_argument,      NULL, 'p' },
 186         { "ssl",        no_argument,            NULL, 's' },
 187         { "killmask",   no_argument,            NULL, 'k' },
 188         { "version",    required_argument,      NULL, 'v' },
 189         { "undeflated", no_argument,            NULL, 'u' },
 190         { NULL, 0, 0, 0 }
 191 };
 192
 193
 194 int main(int argc, char **argv)
 195 {
 196         int n = 0;
 197         int port = 7681;
 198         int use_ssl = 0;
 199         struct libwebsocket_context *context;
 200         const char *address;
 201         struct libwebsocket *wsi_dumb;
 202         int ietf_version = -1; /* latest */
 203         int mirror_lifetime = 0;
 204
 205         fprintf(stderr, "libwebsockets test client\n"
 206                         "(C) Copyright 2010 Andy Green <andy@warmcat.com> "
 207                                                     "licensed under LGPL2.1\n");
 208
 209         if (argc < 2)
 210                 goto usage;
 211
 212         while (n >= 0) {
 213                 n = getopt_long(argc, argv, "uv:khsp:", options, NULL);
 214                 if (n < 0)
 215                         continue;
 216                 switch (n) {
 217                 case 's':
 218                         use_ssl = 2; /* 2 = allow selfsigned */
 219                         break;
 220                 case 'p':
 221                         port = atoi(optarg);
 222                         break;
 223                 case 'k':
 224                         opts = LWS_WRITE_CLIENT_IGNORE_XOR_MASK;
 225                         break;
 226                 case 'v':
 227                         ietf_version = atoi(optarg);
 228                         break;
 229                 case 'u':
 230                         deny_deflate = 1;
 231                         break;
 232                 case 'h':
 233                         goto usage;
 234                 }
 235         }
 236
 237         if (optind >= argc)
 238                 goto usage;
 239
 240         address = argv[optind];
 241
 242         /*
 243          * create the websockets context.  This tracks open connections and
 244          * knows how to route any traffic and which protocol version to use,
 245          * and if each connection is client or server side.
 246          *
 247          * For this client-only demo, we tell it to not listen on any port.
 248          */
 249
 250         context = libwebsocket_create_context(CONTEXT_PORT_NO_LISTEN, NULL,
 251                                 protocols, libwebsocket_internal_extensions,
 252                                                          NULL, NULL, -1, -1, 0);
 253         if (context == NULL) {
 254                 fprintf(stderr, "Creating libwebsocket context failed\n");
 255                 return 1;
 256         }
 257
 258
 259         /* create a client websocket using dumb increment protocol */
 260
 261         wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl,
 262                         "/", argv[optind], argv[optind],
 263                          protocols[PROTOCOL_DUMB_INCREMENT].name, ietf_version);
 264
 265         if (wsi_dumb == NULL) {
 266                 fprintf(stderr, "libwebsocket dumb connect failed\n");
 267                 return -1;
 268         }
 269
 270         fprintf(stderr, "Websocket connections opened\n");
 271
 272         /*
 273          * sit there servicing the websocket context to handle incoming
 274          * packets, and drawing random circles on the mirror protocol websocket
 275          */
 276
 277         n = 0;
 278         while (n >= 0 && !was_closed) {
 279                 n = libwebsocket_service(context, 1000);
 280
 281                 if (wsi_mirror == NULL) {
 282
 283                         /* create a client websocket using mirror protocol */
 284
 285                         wsi_mirror = libwebsocket_client_connect(context, address, port,
 286                              use_ssl,  "/", argv[optind], argv[optind],
 287                                              protocols[PROTOCOL_LWS_MIRROR].name, ietf_version);
 288
 289                         if (wsi_mirror == NULL) {
 290                                 fprintf(stderr, "libwebsocket dumb connect failed\n");
 291                                 return -1;
 292                         }
 293
 294                         mirror_lifetime = 10 + (random() & 1023);
 295
 296                         fprintf(stderr, "opened mirror connection with %d lifetime\n", mirror_lifetime);
 297
 298                 } else {
 299
 300                         mirror_lifetime--;
 301                         if (mirror_lifetime == 0) {
 302                                 fprintf(stderr, "closing mirror session\n");
 303                                 libwebsocket_close_and_free_session(context,
 304                                         wsi_mirror, LWS_CLOSE_STATUS_GOINGAWAY);
 305
 306                                 /*
 307                                  * wsi_mirror will get set to NULL in
 308                                  * callback when close completes
 309                                  */
 310                         }
 311                 }
 312         }
 313
 314         fprintf(stderr, "Exiting\n");
 315
 316         libwebsocket_context_destroy(context);
 317
 318         return 0;
 319
 320 usage:
 321         fprintf(stderr, "Usage: libwebsockets-test-client "
 322                                              "<server address> [--port=<p>] "
 323                                              "[--ssl] [-k] [-v <ver>]\n");
 324         return 1;
 325 }