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/*
* lws-minimal-ws-client-ping
*
* Written in 2010-2020 by Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*
* This demonstrates keeping a ws connection validated by the lws validity
* timer stuff without having to do anything in the code. Use debug logging
* -d1039 to see lws doing the pings / pongs in the background.
*/
#include <libwebsockets.h>
#include <string.h>
#include <signal.h>
#if defined(WIN32)
#define HAVE_STRUCT_TIMESPEC
#if defined(pid_t)
#undef pid_t
#endif
#endif
#include <pthread.h>
static struct lws_context *context;
static struct lws *client_wsi;
static int interrupted, port = 443, ssl_connection = LCCSCF_USE_SSL;
static const char *server_address = "libwebsockets.org", *pro = "lws-mirror-protocol";
static lws_sorted_usec_list_t sul;
static const lws_retry_bo_t retry = {
.secs_since_valid_ping = 3,
.secs_since_valid_hangup = 10,
};
static void
connect_cb(lws_sorted_usec_list_t *_sul)
{
struct lws_client_connect_info i;
lwsl_notice("%s: connecting\n", __func__);
memset(&i, 0, sizeof(i));
i.context = context;
i.port = port;
i.address = server_address;
i.path = "/";
i.host = i.address;
i.origin = i.address;
i.ssl_connection = ssl_connection;
i.protocol = pro;
i.alpn = "h2;http/1.1";
i.local_protocol_name = "lws-ping-test";
i.pwsi = &client_wsi;
i.retry_and_idle_policy = &retry;
if (!lws_client_connect_via_info(&i))
lws_sul_schedule(context, 0, _sul, connect_cb, 5 * LWS_USEC_PER_SEC);
}
static int
callback_minimal_pingtest(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
switch (reason) {
case LWS_CALLBACK_CLIENT_CONNECTION_ERROR:
lwsl_err("CLIENT_CONNECTION_ERROR: %s\n",
in ? (char *)in : "(null)");
lws_sul_schedule(context, 0, &sul, connect_cb, 5 * LWS_USEC_PER_SEC);
break;
case LWS_CALLBACK_CLIENT_ESTABLISHED:
lwsl_user("%s: established\n", __func__);
break;
default:
break;
}
return lws_callback_http_dummy(wsi, reason, user, in, len);
}
static const struct lws_protocols protocols[] = {
{
"lws-ping-test",
callback_minimal_pingtest,
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;
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 and built 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);
lws_set_log_level(logs, NULL);
lwsl_user("LWS minimal ws client PING\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;
#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
if ((p = lws_cmdline_option(argc, argv, "--protocol")))
pro = p;
if ((p = lws_cmdline_option(argc, argv, "--server"))) {
server_address = p;
pro = "lws-minimal";
ssl_connection |= LCCSCF_ALLOW_SELFSIGNED;
}
if ((p = lws_cmdline_option(argc, argv, "--port")))
port = atoi(p);
info.fd_limit_per_thread = 1 + 1 + 1;
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
return 1;
}
lws_sul_schedule(context, 0, &sul, connect_cb, 100);
while (n >= 0 && !interrupted)
n = lws_service(context, 0);
lws_context_destroy(context);
lwsl_user("Completed\n");
return 0;
}
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