mirror of
https://github.com/warmcat/libwebsockets.git
synced 2025-03-16 00:00:07 +01:00
aa816e98a9
Since new roles may be incompatible with http, add support for alpn names at the role struct, automatic generation of the default list of alpn names that servers advertise, and the ability to override the used alpn names per-vhost and per- client connection. This not only lets you modulate visibility or use of h2, but also enables vhosts that only offer non-http roles, as well as restricting http role vhosts to only alpn identifiers related to http roles.
135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
/*
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* lws-minimal-ws-client
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*
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* Copyright (C) 2018 Andy Green <andy@warmcat.com>
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*
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* This file is made available under the Creative Commons CC0 1.0
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* Universal Public Domain Dedication.
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*
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* This demonstrates the a minimal ws client using lws.
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*
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* It connects to https://libwebsockets.org/ and makes a
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* wss connection to the dumb-increment protocol there. While
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* connected, it prints the numbers it is being sent by
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* dumb-increment protocol.
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*/
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#include <libwebsockets.h>
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#include <string.h>
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#include <signal.h>
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static int interrupted;
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static struct lws *client_wsi;
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static int
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callback_dumb_increment(struct lws *wsi, enum lws_callback_reasons reason,
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void *user, void *in, size_t len)
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{
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switch (reason) {
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/* because we are protocols[0] ... */
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case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
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lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
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in ? (char *)in : "(null)");
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client_wsi = NULL;
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break;
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case LWS_CALLBACK_CLIENT_ESTABLISHED:
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lwsl_user("%s: established\n", __func__);
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break;
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case LWS_CALLBACK_CLIENT_RECEIVE:
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lwsl_user("RX: %s\n", (const char *)in);
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break;
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case LWS_CALLBACK_CLIENT_CLOSED:
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client_wsi = NULL;
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break;
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default:
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break;
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}
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return lws_callback_http_dummy(wsi, reason, user, in, len);
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}
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static const struct lws_protocols protocols[] = {
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{
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"dumb-increment-protocol",
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callback_dumb_increment,
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0,
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0,
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},
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{ NULL, NULL, 0, 0 }
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};
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static void
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sigint_handler(int sig)
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{
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interrupted = 1;
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}
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int main(int argc, const char **argv)
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{
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struct lws_context_creation_info info;
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struct lws_client_connect_info i;
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struct lws_context *context;
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const char *p;
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int n = 0, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
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/* for LLL_ verbosity above NOTICE to be built into lws, lws
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* must have been configured with -DCMAKE_BUILD_TYPE=DEBUG
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* instead of =RELEASE */
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/* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */
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/* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */
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/* | LLL_DEBUG */;
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signal(SIGINT, sigint_handler);
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if ((p = lws_cmdline_option(argc, argv, "-d")))
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logs = atoi(p);
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lws_set_log_level(logs, NULL);
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lwsl_user("LWS minimal ws client rx [-d <logs>] [--h2]\n");
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memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
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info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
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info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */
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info.protocols = protocols;
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#if defined(LWS_WITH_MBEDTLS)
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/*
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* OpenSSL uses the system trust store. mbedTLS has to be told which
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* CA to trust explicitly.
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*/
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info.client_ssl_ca_filepath = "./libwebsockets.org.cer";
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#endif
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context = lws_create_context(&info);
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if (!context) {
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lwsl_err("lws init failed\n");
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return 1;
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}
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memset(&i, 0, sizeof i); /* otherwise uninitialized garbage */
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i.context = context;
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i.port = 443;
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i.address = "libwebsockets.org";
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i.path = "/";
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i.host = i.address;
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i.origin = i.address;
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i.ssl_connection = LCCSCF_USE_SSL;
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i.protocol = protocols[0].name; /* "dumb-increment-protocol" */
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i.pwsi = &client_wsi;
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if (lws_cmdline_option(argc, argv, "--h2"))
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i.alpn = "h2";
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lws_client_connect_via_info(&i);
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while (n >= 0 && client_wsi && !interrupted)
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n = lws_service(context, 1000);
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lws_context_destroy(context);
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lwsl_user("Completed\n");
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return 0;
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}
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