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 int deny_mux;
  34 static struct libwebsocket *wsi_mirror;
  35 static int mirror_lifetime = 0;
  36
  37 /*
  38  * This demo shows how to connect multiple websockets simultaneously to a
  39  * websocket server (there is no restriction on their having to be the same
  40  * server just it simplifies the demo).
  41  *
  42  *  dumb-increment-protocol:  we connect to the server and print the number
  43  *                              we are given
  44  *
  45  *  lws-mirror-protocol: draws random circles, which are mirrored on to every
  46  *                              client (see them being drawn in every browser
  47  *                              session also using the test server)
  48  */
  49
  50 enum demo_protocols {
  51
  52         PROTOCOL_DUMB_INCREMENT,
  53         PROTOCOL_LWS_MIRROR,
  54
  55         /* always last */
  56         DEMO_PROTOCOL_COUNT
  57 };
  58
  59
  60 /* dumb_increment protocol */
  61
  62 static int
  63 callback_dumb_increment(struct libwebsocket_context *this,
  64                         struct libwebsocket *wsi,
  65                         enum libwebsocket_callback_reasons reason,
  66                                                void *user, void *in, size_t len)
  67 {
  68         switch (reason) {
  69
  70         case LWS_CALLBACK_CLOSED:
  71                 fprintf(stderr, "LWS_CALLBACK_CLOSED\n");
  72                 was_closed = 1;
  73                 break;
  74
  75         case LWS_CALLBACK_CLIENT_RECEIVE:
  76                 ((char *)in)[len] = '\0';
  77                 fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in);
  78                 break;
  79
  80         /* because we are protocols[0] ... */
  81
  82         case LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED:
  83                 if ((strcmp(in, "deflate-stream") == 0) && deny_deflate) {
  84                         fprintf(stderr, "denied deflate-stream extension\n");
  85                         return 1;
  86                 }
  87                 if ((strcmp(in, "x-google-mux") == 0) && deny_mux) {
  88                         fprintf(stderr, "denied x-google-mux extension\n");
  89                         return 1;
  90                 }
  91
  92                 break;
  93
  94         default:
  95                 break;
  96         }
  97
  98         return 0;
  99 }
 100
 101
 102 /* lws-mirror_protocol */
 103
 104
 105 static int
 106 callback_lws_mirror(struct libwebsocket_context *context,
 107                         struct libwebsocket *wsi,
 108                         enum libwebsocket_callback_reasons reason,
 109                                                void *user, void *in, size_t len)
 110 {
 111         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 4096 +
 112                                                   LWS_SEND_BUFFER_POST_PADDING];
 113         int l = 0;
 114         int n;
 115
 116         switch (reason) {
 117
 118         case LWS_CALLBACK_CLOSED:
 119                 fprintf(stderr, "mirror: LWS_CALLBACK_CLOSED\n");
 120                 wsi_mirror = NULL;
 121                 break;
 122
 123         case LWS_CALLBACK_CLIENT_ESTABLISHED:
 124
 125                 /*
 126                  * start the ball rolling,
 127                  * LWS_CALLBACK_CLIENT_WRITEABLE will come next service
 128                  */
 129
 130                 libwebsocket_callback_on_writable(context, wsi);
 131                 break;
 132
 133         case LWS_CALLBACK_CLIENT_RECEIVE:
 134 /*              fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in); */
 135                 break;
 136
 137         case LWS_CALLBACK_CLIENT_WRITEABLE:
 138
 139                 for (n = 0; n < 1; n++)
 140                         l += sprintf((char *)&buf[LWS_SEND_BUFFER_PRE_PADDING + l],
 141                                         "c #%06X %d %d %d;",
 142                                         (int)random() & 0xffffff,
 143                                         (int)random() % 500,
 144                                         (int)random() % 250,
 145                                         (int)random() % 24);
 146
 147                 libwebsocket_write(wsi,
 148                    &buf[LWS_SEND_BUFFER_PRE_PADDING], l, opts | LWS_WRITE_TEXT);
 149
 150                 mirror_lifetime--;
 151                 if (!mirror_lifetime) {
 152                         fprintf(stderr, "closing mirror session\n");
 153                         libwebsocket_close_and_free_session(context,
 154                                 wsi_mirror, LWS_CLOSE_STATUS_GOINGAWAY);
 155                 } else
 156                         /* get notified as soon as we can write again */
 157                         libwebsocket_callback_on_writable(context, wsi);
 158                 break;
 159
 160         default:
 161                 break;
 162         }
 163
 164         return 0;
 165 }
 166
 167
 168 /* list of supported protocols and callbacks */
 169
 170 static struct libwebsocket_protocols protocols[] = {
 171         {
 172                 "dumb-increment-protocol",
 173                 callback_dumb_increment,
 174                 0,
 175                 20,
 176         },
 177         {
 178                 "lws-mirror-protocol",
 179                 callback_lws_mirror,
 180                 0,
 181                 128,
 182         },
 183         { NULL, NULL, 0, 0 } /* end */
 184 };
 185
 186 static struct option options[] = {
 187         { "help",       no_argument,            NULL, 'h' },
 188         { "debug",      required_argument,      NULL, 'd' },
 189         { "port",       required_argument,      NULL, 'p' },
 190         { "ssl",        no_argument,            NULL, 's' },
 191         { "version",    required_argument,      NULL, 'v' },
 192         { "undeflated", no_argument,            NULL, 'u' },
 193         { "nomux",      no_argument,            NULL, 'n' },
 194         { "longlived",  no_argument,            NULL, 'l' },
 195         { NULL, 0, 0, 0 }
 196 };
 197
 198
 199 int main(int argc, char **argv)
 200 {
 201         int n = 0;
 202         int port = 7681;
 203         int use_ssl = 0;
 204         struct libwebsocket_context *context;
 205         const char *address;
 206         struct libwebsocket *wsi_dumb;
 207         int ietf_version = -1; /* latest */
 208         int longlived = 0;
 209         struct lws_context_creation_info info;
 210
 211         memset(&info, 0, sizeof info);
 212
 213         fprintf(stderr, "libwebsockets test client\n"
 214                         "(C) Copyright 2010-2013 Andy Green <andy@warmcat.com> "
 215                                                     "licensed under LGPL2.1\n");
 216
 217         if (argc < 2)
 218                 goto usage;
 219
 220         while (n >= 0) {
 221                 n = getopt_long(argc, argv, "nuv:hsp:d:l", options, NULL);
 222                 if (n < 0)
 223                         continue;
 224                 switch (n) {
 225                 case 'd':
 226                         lws_set_log_level(atoi(optarg), NULL);
 227                         break;
 228                 case 's':
 229                         use_ssl = 2; /* 2 = allow selfsigned */
 230                         break;
 231                 case 'p':
 232                         port = atoi(optarg);
 233                         break;
 234                 case 'l':
 235                         longlived = 1;
 236                         break;
 237                 case 'v':
 238                         ietf_version = atoi(optarg);
 239                         break;
 240                 case 'u':
 241                         deny_deflate = 1;
 242                         break;
 243                 case 'n':
 244                         deny_mux = 1;
 245                         break;
 246                 case 'h':
 247                         goto usage;
 248                 }
 249         }
 250
 251         if (optind >= argc)
 252                 goto usage;
 253
 254         address = argv[optind];
 255
 256         /*
 257          * create the websockets context.  This tracks open connections and
 258          * knows how to route any traffic and which protocol version to use,
 259          * and if each connection is client or server side.
 260          *
 261          * For this client-only demo, we tell it to not listen on any port.
 262          */
 263
 264         info.port = CONTEXT_PORT_NO_LISTEN;
 265         info.protocols = protocols;
 266 #ifndef LWS_NO_EXTENSIONS
 267         info.extensions = libwebsocket_internal_extensions;
 268 #endif
 269         info.gid = -1;
 270         info.uid = -1;
 271
 272         context = libwebsocket_create_context(&info);
 273         if (context == NULL) {
 274                 fprintf(stderr, "Creating libwebsocket context failed\n");
 275                 return 1;
 276         }
 277
 278         /* create a client websocket using dumb increment protocol */
 279
 280         wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl,
 281                         "/", argv[optind], argv[optind],
 282                          protocols[PROTOCOL_DUMB_INCREMENT].name, ietf_version);
 283
 284         if (wsi_dumb == NULL) {
 285                 fprintf(stderr, "libwebsocket dumb connect failed\n");
 286                 return -1;
 287         }
 288
 289         fprintf(stderr, "Websocket connections opened\n");
 290
 291         /*
 292          * sit there servicing the websocket context to handle incoming
 293          * packets, and drawing random circles on the mirror protocol websocket
 294          */
 295
 296         n = 0;
 297         while (n >= 0 && !was_closed) {
 298                 n = libwebsocket_service(context, 10);
 299
 300                 if (n < 0)
 301                         continue;
 302
 303                 if (wsi_mirror)
 304                         continue;
 305
 306                 /* create a client websocket using mirror protocol */
 307
 308                 wsi_mirror = libwebsocket_client_connect(context,
 309                         address, port, use_ssl,  "/",
 310                         argv[optind], argv[optind],
 311                         protocols[PROTOCOL_LWS_MIRROR].name, ietf_version);
 312
 313                 if (wsi_mirror == NULL) {
 314                         fprintf(stderr, "libwebsocket "
 315                                               "dumb connect failed\n");
 316                         return -1;
 317                 }
 318
 319                 mirror_lifetime = 10 + (random() & 1023);
 320                 /* useful to test single connection stability */
 321                 if (longlived)
 322                         mirror_lifetime += 50000;
 323
 324                 fprintf(stderr, "opened mirror connection with "
 325                                      "%d lifetime\n", mirror_lifetime);
 326
 327                 /*
 328                  * mirror_lifetime is decremented each send, when it reaches
 329                  * zero the connection is closed in the send callback.
 330                  * When the close callback comes, wsi_mirror is set to NULL
 331                  * so a new connection will be opened
 332                  */
 333         }
 334
 335         fprintf(stderr, "Exiting\n");
 336
 337         libwebsocket_context_destroy(context);
 338
 339         return 0;
 340
 341 usage:
 342         fprintf(stderr, "Usage: libwebsockets-test-client "
 343                                 "<server address> [--port=<p>] "
 344                                 "[--ssl] [-k] [-v <ver>] "
 345                                 "[-d <log bitfield>] [-l]\n");
 346         return 1;
 347 }