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