/* * libwebsockets-test-client - libwebsockets test implementation * * Copyright (C) 2011 Andy Green * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation: * version 2.1 of the License. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, * MA 02110-1301 USA */ #include #include #include #include #include #include "../lib/libwebsockets.h" #include /* * This demo shows how to connect multiple websockets simultaneously to a * websocket server (there is no restriction on their having to be the same * server just it simplifies the demo). * * dumb-increment-protocol: we connect to the server and print the number * we are given * * lws-mirror-protocol: draws random circles, which are mirrored on to every * client (see them being drawn in every browser * session also using the test server) */ enum demo_protocols { PROTOCOL_DUMB_INCREMENT, PROTOCOL_LWS_MIRROR, /* always last */ DEMO_PROTOCOL_COUNT }; /* dumb_increment protocol */ static int callback_dumb_increment(struct libwebsocket *wsi, enum libwebsocket_callback_reasons reason, void *user, void *in, size_t len) { switch (reason) { case LWS_CALLBACK_CLIENT_RECEIVE: ((char *)in)[len] = '\0'; fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in); break; default: break; } return 0; } /* lws-mirror_protocol */ static int callback_lws_mirror(struct libwebsocket *wsi, enum libwebsocket_callback_reasons reason, void *user, void *in, size_t len) { unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + 4096 + LWS_SEND_BUFFER_POST_PADDING]; int l; switch (reason) { case LWS_CALLBACK_CLIENT_ESTABLISHED: /* * start the ball rolling, * LWS_CALLBACK_CLIENT_WRITEABLE will come next service */ libwebsocket_callback_on_writable(wsi); break; case LWS_CALLBACK_CLIENT_RECEIVE: /* fprintf(stderr, "rx %d '%s'\n", (int)len, (char *)in); */ break; case LWS_CALLBACK_CLIENT_WRITEABLE: l = sprintf((char *)&buf[LWS_SEND_BUFFER_PRE_PADDING], "c #%06X %d %d %d;", (int)random() & 0xffffff, (int)random() % 500, (int)random() % 250, (int)random() % 24); libwebsocket_write(wsi, &buf[LWS_SEND_BUFFER_PRE_PADDING], l, LWS_WRITE_TEXT); /* get notified as soon as we can write again */ libwebsocket_callback_on_writable(wsi); /* * without at least this delay, we choke the browser * and the connection stalls, despite we now take care about * flow control */ usleep(200); break; default: break; } return 0; } /* list of supported protocols and callbacks */ static struct libwebsocket_protocols protocols[] = { [PROTOCOL_DUMB_INCREMENT] = { .name = "dumb-increment-protocol", .callback = callback_dumb_increment, }, [PROTOCOL_LWS_MIRROR] = { .name = "lws-mirror-protocol", .callback = callback_lws_mirror, }, [DEMO_PROTOCOL_COUNT] = { /* end of list */ .callback = NULL } }; static struct option options[] = { { "help", no_argument, NULL, 'h' }, { "port", required_argument, NULL, 'p' }, { "ssl", no_argument, NULL, 's' }, { NULL, 0, 0, 0 } }; int main(int argc, char **argv) { int n = 0; int port = 7681; int use_ssl = 0; struct libwebsocket_context *context; const char *address = argv[1]; struct libwebsocket *wsi_dumb; struct libwebsocket *wsi_mirror; fprintf(stderr, "libwebsockets test client\n" "(C) Copyright 2010 Andy Green " "licensed under LGPL2.1\n"); if (argc < 2) goto usage; optind++; while (n >= 0) { n = getopt_long(argc, argv, "hsp:", options, NULL); if (n < 0) continue; switch (n) { case 's': use_ssl = 2; /* 2 = allow selfsigned */ break; case 'p': port = atoi(optarg); break; case 'h': goto usage; } } /* * create the websockets context. This tracks open connections and * knows how to route any traffic and which protocol version to use, * and if each connection is client or server side. * * For this client-only demo, we tell it to not listen on any port. */ context = libwebsocket_create_context(CONTEXT_PORT_NO_LISTEN, protocols, NULL, NULL, -1, -1); if (context == NULL) { fprintf(stderr, "Creating libwebsocket context failed\n"); return 1; } /* create a client websocket using dumb increment protocol */ wsi_dumb = libwebsocket_client_connect(context, address, port, use_ssl, "/", "http://host", "origin", protocols[PROTOCOL_DUMB_INCREMENT].name); if (wsi_dumb == NULL) { fprintf(stderr, "libwebsocket dumb connect failed\n"); return -1; } /* create a client websocket using mirror protocol */ wsi_mirror = libwebsocket_client_connect(context, address, port, use_ssl, "/", "http://host", "origin", protocols[PROTOCOL_LWS_MIRROR].name); if (wsi_mirror == NULL) { fprintf(stderr, "libwebsocket dumb connect failed\n"); return -1; } fprintf(stderr, "Websocket connections opened\n"); /* * sit there servicing the websocket context to handle incoming * packets, and drawing random circles on the mirror protocol websocket */ n = 0; while (n >= 0) n = libwebsocket_service(context, 1000); libwebsocket_client_close(wsi_dumb); libwebsocket_client_close(wsi_mirror); libwebsocket_context_destroy(context); return 0; usage: fprintf(stderr, "Usage: libwebsockets-test-client " " [--port=

] " "[--ssl]\n"); return 1; }