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f7149e90c2
https://libwebsockets.org/pipermail/libwebsockets/2019-April/007937.html thanks to Bruce Perens for noting it. This doesn't change the intention or status of the CC0 files, they were pure CC0 before (ie, public domain) and they are pure CC0 now. It just gets rid of the (C) part at the top of the dedication which may be read to be a bit contradictory since the purpose is to make it public domain.
140 lines
3.4 KiB
C
140 lines
3.4 KiB
C
/*
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* lws-minimal-ws-client
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*
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* Written in 2010-2019 by 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, rx_seen, test;
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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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rx_seen++;
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if (test && rx_seen == 10)
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interrupted = 1;
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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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test = !!lws_cmdline_option(argc, argv, "-t");
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lws_set_log_level(logs, NULL);
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lwsl_user("LWS minimal ws client rx [-d <logs>] [--h2] [-t (test)]\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 %s\n", rx_seen > 10 ? "OK" : "Failed");
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return rx_seen > 10;
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}
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