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 <getopt.h>
  25 #include <string.h>
  26 #include <signal.h>
  27
  28 #ifdef _WIN32
  29 #define random rand
  30 #include "gettimeofday.h"
  31 #else
  32 #include <syslog.h>
  33 #include <sys/time.h>
  34 #include <unistd.h>
  35 #endif
  36
  37 #include "../lib/libwebsockets.h"
  38
  39 static int deny_deflate, deny_mux, longlived, mirror_lifetime;
  40 static struct lws *wsi_dumb, *wsi_mirror;
  41 static volatile int force_exit;
  42 static unsigned int opts;
  43
  44 /*
  45  * This demo shows how to connect multiple websockets simultaneously to a
  46  * websocket server (there is no restriction on their having to be the same
  47  * server just it simplifies the demo).
  48  *
  49  *  dumb-increment-protocol:  we connect to the server and print the number
  50  *                              we are given
  51  *
  52  *  lws-mirror-protocol: draws random circles, which are mirrored on to every
  53  *                              client (see them being drawn in every browser
  54  *                              session also using the test server)
  55  */
  56
  57 enum demo_protocols {
  58
  59         PROTOCOL_DUMB_INCREMENT,
  60         PROTOCOL_LWS_MIRROR,
  61
  62         /* always last */
  63         DEMO_PROTOCOL_COUNT
  64 };
  65
  66
  67 /*
  68  * dumb_increment protocol
  69  *
  70  * since this also happens to be protocols[0], some callbacks that are not
  71  * bound to a specific protocol also turn up here.
  72  */
  73
  74 static int
  75 callback_dumb_increment(struct lws *wsi, enum lws_callback_reasons reason,
  76                         void *user, void *in, size_t len)
  77 {
  78         switch (reason) {
  79
  80         case LWS_CALLBACK_CLIENT_ESTABLISHED:
  81                 lwsl_info("dumb: LWS_CALLBACK_CLIENT_ESTABLISHED\n");
  82                 break;
  83
  84         case LWS_CALLBACK_CLOSED:
  85                 lwsl_notice("dumb: LWS_CALLBACK_CLOSED\n");
  86                 wsi_dumb = NULL;
  87                 break;
  88
  89         case LWS_CALLBACK_CLIENT_RECEIVE:
  90                 ((char *)in)[len] = '\0';
  91                 lwsl_info("rx %d '%s'\n", (int)len, (char *)in);
  92                 break;
  93
  94         /* because we are protocols[0] ... */
  95
  96         case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
  97                 if (wsi == wsi_dumb) {
  98                         lwsl_err("dumb: LWS_CALLBACK_CLIENT_CONNECTION_ERROR\n");
  99                         wsi_dumb = NULL;
 100                 }
 101                 if (wsi == wsi_mirror) {
 102                         lwsl_err("mirror: LWS_CALLBACK_CLIENT_CONNECTION_ERROR\n");
 103                         wsi_mirror = NULL;
 104                 }
 105                 break;
 106
 107         case LWS_CALLBACK_CLIENT_CONFIRM_EXTENSION_SUPPORTED:
 108                 if ((strcmp(in, "deflate-stream") == 0) && deny_deflate) {
 109                         lwsl_notice("denied deflate-stream extension\n");
 110                         return 1;
 111                 }
 112                 if ((strcmp(in, "deflate-frame") == 0) && deny_deflate) {
 113                         lwsl_notice("denied deflate-frame extension\n");
 114                         return 1;
 115                 }
 116                 if ((strcmp(in, "x-google-mux") == 0) && deny_mux) {
 117                         lwsl_notice("denied x-google-mux extension\n");
 118                         return 1;
 119                 }
 120                 break;
 121
 122         default:
 123                 break;
 124         }
 125
 126         return 0;
 127 }
 128
 129
 130 /* lws-mirror_protocol */
 131
 132
 133 static int
 134 callback_lws_mirror(struct lws *wsi, enum lws_callback_reasons reason,
 135                     void *user, void *in, size_t len)
 136 {
 137         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 4096 +
 138                           LWS_SEND_BUFFER_POST_PADDING];
 139         unsigned int rands[4];
 140         int l = 0;
 141         int n;
 142
 143         switch (reason) {
 144         case LWS_CALLBACK_CLIENT_ESTABLISHED:
 145
 146                 lwsl_notice("mirror: LWS_CALLBACK_CLIENT_ESTABLISHED\n");
 147
 148                 lws_get_random(lws_get_context(wsi), rands, sizeof(rands[0]));
 149                 mirror_lifetime = 16384 + (rands[0] & 65535);
 150                 /* useful to test single connection stability */
 151                 if (longlived)
 152                         mirror_lifetime += 500000;
 153
 154                 lwsl_info("opened mirror connection with "
 155                           "%d lifetime\n", mirror_lifetime);
 156
 157                 /*
 158                  * mirror_lifetime is decremented each send, when it reaches
 159                  * zero the connection is closed in the send callback.
 160                  * When the close callback comes, wsi_mirror is set to NULL
 161                  * so a new connection will be opened
 162                  *
 163                  * start the ball rolling,
 164                  * LWS_CALLBACK_CLIENT_WRITEABLE will come next service
 165                  */
 166                 lws_callback_on_writable(wsi);
 167                 break;
 168
 169         case LWS_CALLBACK_CLOSED:
 170                 lwsl_notice("mirror: LWS_CALLBACK_CLOSED mirror_lifetime=%d\n", mirror_lifetime);
 171                 wsi_mirror = NULL;
 172                 break;
 173
 174         case LWS_CALLBACK_CLIENT_WRITEABLE:
 175                 for (n = 0; n < 1; n++) {
 176                         lws_get_random(lws_get_context(wsi), rands, sizeof(rands));
 177                         l += sprintf((char *)&buf[LWS_SEND_BUFFER_PRE_PADDING + l],
 178                                         "c #%06X %d %d %d;",
 179                                         (int)rands[0] & 0xffffff,
 180                                         (int)rands[1] % 500,
 181                                         (int)rands[2] % 250,
 182                                         (int)rands[3] % 24);
 183                 }
 184
 185                 n = lws_write(wsi, &buf[LWS_SEND_BUFFER_PRE_PADDING], l,
 186                               opts | LWS_WRITE_TEXT);
 187                 if (n < 0)
 188                         return -1;
 189                 if (n < l) {
 190                         lwsl_err("Partial write LWS_CALLBACK_CLIENT_WRITEABLE\n");
 191                         return -1;
 192                 }
 193
 194                 mirror_lifetime--;
 195                 if (!mirror_lifetime) {
 196                         lwsl_info("closing mirror session\n");
 197                         return -1;
 198                 }
 199                 /* get notified as soon as we can write again */
 200                 lws_callback_on_writable(wsi);
 201                 break;
 202
 203         default:
 204                 break;
 205         }
 206
 207         return 0;
 208 }
 209
 210
 211 /* list of supported protocols and callbacks */
 212
 213 static struct lws_protocols protocols[] = {
 214         {
 215                 "dumb-increment-protocol,fake-nonexistant-protocol",
 216                 callback_dumb_increment,
 217                 0,
 218                 20,
 219         },
 220         {
 221                 "fake-nonexistant-protocol,lws-mirror-protocol",
 222                 callback_lws_mirror,
 223                 0,
 224                 128,
 225         },
 226         { NULL, NULL, 0, 0 } /* end */
 227 };
 228
 229 void sighandler(int sig)
 230 {
 231         force_exit = 1;
 232 }
 233
 234 static struct option options[] = {
 235         { "help",       no_argument,            NULL, 'h' },
 236         { "debug",      required_argument,      NULL, 'd' },
 237         { "port",       required_argument,      NULL, 'p' },
 238         { "ssl",        no_argument,            NULL, 's' },
 239         { "version",    required_argument,      NULL, 'v' },
 240         { "undeflated", no_argument,            NULL, 'u' },
 241         { "nomux",      no_argument,            NULL, 'n' },
 242         { "longlived",  no_argument,            NULL, 'l' },
 243         { NULL, 0, 0, 0 }
 244 };
 245
 246 static int ratelimit_connects(unsigned int *last, int secs)
 247 {
 248         struct timeval tv;
 249
 250         gettimeofday(&tv, NULL);
 251         if (tv.tv_sec - (*last) < secs)
 252                 return 0;
 253
 254         *last = tv.tv_sec;
 255
 256         return 1;
 257 }
 258
 259 int main(int argc, char **argv)
 260 {
 261         int n = 0, ret = 0, port = 7681, use_ssl = 0;
 262         unsigned int rl_dumb = 0, rl_mirror = 0;
 263         struct lws_context_creation_info info;
 264         struct lws_context *context;
 265         int ietf_version = -1; /* latest */
 266         const char *address;
 267
 268         memset(&info, 0, sizeof info);
 269
 270         fprintf(stderr, "libwebsockets test client\n"
 271                         "(C) Copyright 2010-2015 Andy Green <andy@warmcat.com> "
 272                         "licensed under LGPL2.1\n");
 273
 274         if (argc < 2)
 275                 goto usage;
 276
 277         while (n >= 0) {
 278                 n = getopt_long(argc, argv, "nuv:hsp:d:l", options, NULL);
 279                 if (n < 0)
 280                         continue;
 281                 switch (n) {
 282                 case 'd':
 283                         lws_set_log_level(atoi(optarg), NULL);
 284                         break;
 285                 case 's':
 286                         use_ssl = 2; /* 2 = allow selfsigned */
 287                         break;
 288                 case 'p':
 289                         port = atoi(optarg);
 290                         break;
 291                 case 'l':
 292                         longlived = 1;
 293                         break;
 294                 case 'v':
 295                         ietf_version = atoi(optarg);
 296                         break;
 297                 case 'u':
 298                         deny_deflate = 1;
 299                         break;
 300                 case 'n':
 301                         deny_mux = 1;
 302                         break;
 303                 case 'h':
 304                         goto usage;
 305                 }
 306         }
 307
 308         if (optind >= argc)
 309                 goto usage;
 310
 311         signal(SIGINT, sighandler);
 312
 313         address = argv[optind];
 314
 315         /*
 316          * create the websockets context.  This tracks open connections and
 317          * knows how to route any traffic and which protocol version to use,
 318          * and if each connection is client or server side.
 319          *
 320          * For this client-only demo, we tell it to not listen on any port.
 321          */
 322
 323         info.port = CONTEXT_PORT_NO_LISTEN;
 324         info.protocols = protocols;
 325 #ifndef LWS_NO_EXTENSIONS
 326         info.extensions = lws_get_internal_extensions();
 327 #endif
 328         info.gid = -1;
 329         info.uid = -1;
 330
 331         context = lws_create_context(&info);
 332         if (context == NULL) {
 333                 fprintf(stderr, "Creating libwebsocket context failed\n");
 334                 return 1;
 335         }
 336
 337         /*
 338          * sit there servicing the websocket context to handle incoming
 339          * packets, and drawing random circles on the mirror protocol websocket
 340          *
 341          * nothing happens until the client websocket connection is
 342          * asynchronously established... calling lws_client_connect() only
 343          * instantiates the connection logically, lws_service() progresses it
 344          * asynchronously.
 345          */
 346
 347         while (!force_exit) {
 348
 349                 if (!wsi_dumb && ratelimit_connects(&rl_dumb, 2)) {
 350                         lwsl_notice("dumb: connecting\n");
 351                         wsi_dumb = lws_client_connect(context, address, port,
 352                                 use_ssl, "/", argv[optind], argv[optind],
 353                                 protocols[PROTOCOL_DUMB_INCREMENT].name,
 354                                 ietf_version);
 355                 }
 356
 357                 if (!wsi_mirror && ratelimit_connects(&rl_mirror, 2)) {
 358                         lwsl_notice("mirror: connecting\n");
 359                         wsi_mirror = lws_client_connect(context,
 360                                 address, port, use_ssl,  "/",
 361                                 argv[optind], argv[optind],
 362                                 protocols[PROTOCOL_LWS_MIRROR].name,
 363                                 ietf_version);
 364                 }
 365
 366                 lws_service(context, 500);
 367         }
 368
 369         lwsl_err("Exiting\n");
 370         lws_context_destroy(context);
 371
 372         return ret;
 373
 374 usage:
 375         fprintf(stderr, "Usage: libwebsockets-test-client "
 376                                 "<server address> [--port=<p>] "
 377                                 "[--ssl] [-k] [-v <ver>] "
 378                                 "[-d <log bitfield>] [-l]\n");
 379         return 1;
 380 }