test-server/test-server.c

   1 /*
   2  * libwebsockets-test-server - libwebsockets test implementation
   3  *
   4  * Copyright (C) 2010 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 /*
  31  * This demo server shows how to use libwebsockets for one or more
  32  * websocket protocols in the same server
  33  *
  34  * It defines the following websocket protocols:
  35  *
  36  *  dumb-increment-protocol:  once the socket is opened, an incrementing
  37  *                              ascii string is sent down it every 50ms.
  38  *                              If you send "reset\n" on the websocket, then
  39  *                              the incrementing number is reset to 0.
  40  *
  41  *  lws-mirror-protocol: copies any received packet to every connection also
  42  *                              using this protocol, including the sender
  43  */
  44
  45
  46 #define LOCAL_RESOURCE_PATH "/usr/share/libwebsockets-test-server"
  47 static int port = 7681;
  48 static int use_ssl;
  49
  50 /* this protocol server (always the first one) just knows how to do HTTP */
  51
  52 static int callback_http(struct libwebsocket *wsi,
  53                 enum libwebsocket_callback_reasons reason, void *user,
  54                                                            void *in, size_t len)
  55 {
  56         switch (reason) {
  57         case LWS_CALLBACK_HTTP:
  58                 fprintf(stderr, "serving HTTP URI %s\n", in);
  59
  60                 if (in && strcmp(in, "/favicon.ico") == 0) {
  61                         if (libwebsockets_serve_http_file(wsi,
  62                              LOCAL_RESOURCE_PATH"/favicon.ico", "image/x-icon"))
  63                                 fprintf(stderr, "Failed to send favicon\n");
  64                         break;
  65                 }
  66
  67                 /* send the script... when it runs it'll start websockets */
  68
  69                 if (libwebsockets_serve_http_file(wsi,
  70                                   LOCAL_RESOURCE_PATH"/test.html", "text/html"))
  71                         fprintf(stderr, "Failed to send HTTP file\n");
  72                 break;
  73
  74         default:
  75                 break;
  76         }
  77
  78         return 0;
  79 }
  80
  81 /* dumb_increment protocol */
  82
  83 struct per_session_data__dumb_increment {
  84         int number;
  85 };
  86
  87 static int
  88 callback_dumb_increment(struct libwebsocket *wsi,
  89                         enum libwebsocket_callback_reasons reason,
  90                                                void *user, void *in, size_t len)
  91 {
  92         int n;
  93         char buf[LWS_SEND_BUFFER_PRE_PADDING + 512 +
  94                                                   LWS_SEND_BUFFER_POST_PADDING];
  95         char *p = (char *)&buf[LWS_SEND_BUFFER_PRE_PADDING];
  96         struct per_session_data__dumb_increment *pss = user;
  97
  98         switch (reason) {
  99
 100         case LWS_CALLBACK_ESTABLISHED:
 101                 pss->number = 0;
 102                 break;
 103
 104         /*
 105          * in this protocol, we just use the broadcast action as the chance to
 106          * send our own connection-specific data and ignore the broadcast info
 107          * that is available in the 'in' parameter
 108          */
 109
 110         case LWS_CALLBACK_BROADCAST:
 111                 n = sprintf(p, "%d", pss->number++);
 112                 n = libwebsocket_write(wsi, p, n, LWS_WRITE_TEXT);
 113                 if (n < 0) {
 114                         fprintf(stderr, "ERROR writing to socket");
 115                         return 1;
 116                 }
 117                 break;
 118
 119         case LWS_CALLBACK_RECEIVE:
 120                 fprintf(stderr, "rx %d\n", len);
 121                 if (len < 6)
 122                         break;
 123                 if (strcmp(in, "reset\n") == 0)
 124                         pss->number = 0;
 125                 break;
 126
 127         default:
 128                 break;
 129         }
 130
 131         return 0;
 132 }
 133
 134
 135 /* lws-mirror_protocol */
 136
 137 #define MAX_MESSAGE_QUEUE 64
 138
 139 struct per_session_data__lws_mirror {
 140         struct libwebsocket *wsi;
 141         int ringbuffer_tail;
 142 };
 143
 144 struct a_message {
 145         void *payload;
 146         size_t len;
 147 };
 148
 149 static struct a_message ringbuffer[MAX_MESSAGE_QUEUE];
 150 static int ringbuffer_head;
 151
 152
 153 static int
 154 callback_lws_mirror(struct libwebsocket *wsi,
 155                         enum libwebsocket_callback_reasons reason,
 156                                                void *user, void *in, size_t len)
 157 {
 158         int n;
 159         char buf[LWS_SEND_BUFFER_PRE_PADDING + 512 +
 160                                                   LWS_SEND_BUFFER_POST_PADDING];
 161         unsigned char *p = (unsigned char *)&buf[LWS_SEND_BUFFER_PRE_PADDING];
 162         struct per_session_data__lws_mirror *pss = user;
 163
 164         switch (reason) {
 165
 166         case LWS_CALLBACK_ESTABLISHED:
 167                 pss->wsi = wsi;
 168                 pss->ringbuffer_tail = ringbuffer_head;
 169                 break;
 170
 171         case LWS_CALLBACK_BROADCAST:
 172                 n = libwebsocket_write(wsi, in, len, LWS_WRITE_TEXT);
 173                 break;
 174
 175         case LWS_CALLBACK_RECEIVE:
 176                 /*
 177                  * copy the incoming packet to all other protocol users
 178                  *
 179                  * This demonstrates how easy it is to broadcast from inside
 180                  * a callback.
 181                  *
 182                  * How this works is it calls back to the callback for all
 183                  * connected sockets using this protocol with
 184                  * LWS_CALLBACK_BROADCAST reason.  Our handler for that above
 185                  * writes the data down the socket.
 186                  */
 187                 libwebsockets_broadcast(libwebsockets_get_protocol(wsi),
 188                                                                        in, len);
 189                 break;
 190
 191         default:
 192                 break;
 193         }
 194
 195         return 0;
 196 }
 197
 198
 199 /* list of supported protocols and callbacks */
 200
 201 static struct libwebsocket_protocols protocols[] = {
 202         {
 203                 .name = "http-only",
 204                 .callback = callback_http,
 205                 .per_session_data_size = 0,
 206         },
 207         {
 208                 .name = "dumb-increment-protocol",
 209                 .callback = callback_dumb_increment,
 210                 .per_session_data_size =
 211                                 sizeof(struct per_session_data__dumb_increment),
 212         },
 213         {
 214                 .name = "lws-mirror-protocol",
 215                 .callback = callback_lws_mirror,
 216                 .per_session_data_size =
 217                                 sizeof(struct per_session_data__lws_mirror),
 218         },
 219         {  /* end of list */
 220                 .callback = NULL
 221         }
 222 };
 223
 224 static struct option options[] = {
 225         { "help",       no_argument, NULL, 'h' },
 226         { "port",       required_argument, NULL, 'p' },
 227         { "ssl",        no_argument, NULL, 's' },
 228         { NULL, 0, 0, 0 }
 229 };
 230
 231 int main(int argc, char **argv)
 232 {
 233         int n = 0;
 234         const char *cert_path =
 235                             LOCAL_RESOURCE_PATH"/libwebsockets-test-server.pem";
 236         const char *key_path =
 237                         LOCAL_RESOURCE_PATH"/libwebsockets-test-server.key.pem";
 238         unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 1024 +
 239                                                   LWS_SEND_BUFFER_POST_PADDING];
 240
 241         fprintf(stderr, "libwebsockets test server\n"
 242                         "(C) Copyright 2010 Andy Green <andy@warmcat.com> "
 243                                                     "licensed under LGPL2.1\n");
 244
 245         while (n >= 0) {
 246                 n = getopt_long(argc, argv, "hp:", options, NULL);
 247                 if (n < 0)
 248                         continue;
 249                 switch (n) {
 250                 case 's':
 251                         use_ssl = 1;
 252                         break;
 253                 case 'p':
 254                         port = atoi(optarg);
 255                         break;
 256                 case 'h':
 257                         fprintf(stderr, "Usage: test-server "
 258                                              "[--port=<p>] [--ssl]\n");
 259                         exit(1);
 260                 }
 261         }
 262
 263         if (!use_ssl)
 264                 cert_path = key_path = NULL;
 265
 266         if (libwebsocket_create_server(port, protocols, cert_path, key_path,
 267                                                                   -1, -1) < 0) {
 268                 fprintf(stderr, "libwebsocket init failed\n");
 269                 return -1;
 270         }
 271
 272         /*
 273          * After initializing and creating the websocket server in its own fork
 274          * we return to the main process here
 275          */
 276
 277         buf[LWS_SEND_BUFFER_PRE_PADDING] = 'x';
 278
 279         while (1) {
 280
 281                 sleep(1);
 282
 283                 /*
 284                  * This broadcasts to all dumb-increment-protocol connections
 285                  * once per second.
 286                  *
 287                  * We're just sending a character 'x', in these examples the
 288                  * callbacks send their own per-connection content.
 289                  *
 290                  * You have to send something with nonzero length to get the
 291                  * callback actions delivered.
 292                  *
 293                  * We take care of pre-and-post padding allocation.
 294                  */
 295
 296                 /* [1] == dumb-increment-protocol */
 297                 libwebsockets_broadcast(&protocols[1],
 298                                         &buf[LWS_SEND_BUFFER_PRE_PADDING], 1);
 299         }
 300
 301         return 0;
 302 }