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/*
* lws-minimal-ws-client
*
* Written in 2010-2019 by Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*
* This demonstrates the a minimal ws client using lws.
*
* It connects to https://libwebsockets.org/ and makes a
* wss connection to the dumb-increment protocol there. While
* connected, it prints the numbers it is being sent by
* dumb-increment protocol.
*/
#include <libwebsockets.h>
#include <string.h>
#include <signal.h>
static int interrupted, rx_seen, test;
static struct lws *client_wsi;
static int
callback_dumb_increment(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
switch (reason) {
/* because we are protocols[0] ... */
case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
in ? (char *)in : "(null)");
client_wsi = NULL;
break;
case LWS_CALLBACK_CLIENT_ESTABLISHED:
lwsl_user("%s: established\n", __func__);
break;
case LWS_CALLBACK_CLIENT_RECEIVE:
lwsl_user("RX: %s\n", (const char *)in);
rx_seen++;
if (test && rx_seen == 10)
interrupted = 1;
break;
case LWS_CALLBACK_CLIENT_CLOSED:
client_wsi = NULL;
break;
default:
break;
}
return lws_callback_http_dummy(wsi, reason, user, in, len);
}
static const struct lws_protocols protocols[] = {
{
"dumb-increment-protocol",
callback_dumb_increment,
0, 0, 0, NULL, 0
},
LWS_PROTOCOL_LIST_TERM
};
static void
sigint_handler(int sig)
{
interrupted = 1;
}
int main(int argc, const char **argv)
{
struct lws_context_creation_info info;
struct lws_client_connect_info i;
struct lws_context *context;
const char *p;
int n = 0, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE
/* for LLL_ verbosity above NOTICE to be built into lws, lws
* must have been configured with -DCMAKE_BUILD_TYPE=DEBUG
* instead of =RELEASE */
/* | LLL_INFO */ /* | LLL_PARSER */ /* | LLL_HEADER */
/* | LLL_EXT */ /* | LLL_CLIENT */ /* | LLL_LATENCY */
/* | LLL_DEBUG */;
signal(SIGINT, sigint_handler);
if ((p = lws_cmdline_option(argc, argv, "-d")))
logs = atoi(p);
test = !!lws_cmdline_option(argc, argv, "-t");
lws_set_log_level(logs, NULL);
lwsl_user("LWS minimal ws client rx [-d <logs>] [--h2] [-t (test)]\n");
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
info.port = CONTEXT_PORT_NO_LISTEN; /* we do not run any server */
info.protocols = protocols;
info.timeout_secs = 10;
info.connect_timeout_secs = 30;
#if defined(LWS_WITH_MBEDTLS) || defined(USE_WOLFSSL)
/*
* OpenSSL uses the system trust store. mbedTLS has to be told which
* CA to trust explicitly.
*/
info.client_ssl_ca_filepath = "./libwebsockets.org.cer";
#endif
/*
* since we know this lws context is only ever going to be used with
* one client wsis / fds / sockets at a time, let lws know it doesn't
* have to use the default allocations for fd tables up to ulimit -n.
* It will just allocate for 1 internal and 1 (+ 1 http2 nwsi) that we
* will use.
*/
info.fd_limit_per_thread = 1 + 1 + 1;
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
return 1;
}
memset(&i, 0, sizeof i); /* otherwise uninitialized garbage */
i.context = context;
i.port = 443;
i.address = "libwebsockets.org";
i.path = "/";
i.host = i.address;
i.origin = i.address;
i.ssl_connection = LCCSCF_USE_SSL;
i.protocol = protocols[0].name; /* "dumb-increment-protocol" */
i.pwsi = &client_wsi;
if (lws_cmdline_option(argc, argv, "--h2"))
i.alpn = "h2";
lws_client_connect_via_info(&i);
while (n >= 0 && client_wsi && !interrupted)
n = lws_service(context, 0);
lws_context_destroy(context);
lwsl_user("Completed %s\n", rx_seen > 10 ? "OK" : "Failed");
return rx_seen > 10;
}
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