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/*
* lws-minimal-secure-streams-tx
*
* Written in 2010-2021 by Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*
*
* This demonstrates proxied mass tx from secure streams, this example is a
* client that has no policy of its own, but gets stuff done via the ss proxy.
*
* It opens a websocket stream and fires 100 x small 80-byte payloads on it
* at 20Hz (50ms)
*/
#define LWS_SS_USE_SSPC
#include <libwebsockets.h>
#include <string.h>
#include <signal.h>
#define PKT_SIZE 80
#define RATE_US 50000
static int interrupted, bad = 1, reads = 100;
typedef struct myss {
struct lws_ss_handle *ss;
void *opaque_data;
/* ... application specific state ... */
lws_sorted_usec_list_t sul;
int count;
char due;
} myss_t;
/* secure streams payload interface */
static lws_ss_state_return_t
myss_rx(void *userobj, const uint8_t *buf, size_t len, int flags)
{
/* this example isn't interested in rx */
return LWSSSSRET_OK;
}
static void
txcb(struct lws_sorted_usec_list *sul)
{
myss_t *m = lws_container_of(sul, myss_t, sul);
/*
* We want to do 100 of these ws messages, and then exit, so we can run
* this as a pass / fail test.
*/
if (m->count == reads) {
interrupted = 1;
bad = 0;
} else {
m->due = 1;
lws_ss_request_tx(m->ss);
}
lws_sul_schedule(lws_ss_get_context(m->ss), 0, &m->sul, txcb, RATE_US);
}
static lws_ss_state_return_t
myss_tx(void *userobj, lws_ss_tx_ordinal_t ord, uint8_t *buf, size_t *len,
int *flags)
{
myss_t *m = (myss_t *)userobj;
if (!m->due)
return LWSSSSRET_TX_DONT_SEND;
m->due = 0;
if (lws_get_random(lws_ss_get_context(m->ss), buf, PKT_SIZE) != PKT_SIZE)
return LWSSSSRET_TX_DONT_SEND;
*len = PKT_SIZE;
*flags = LWSSS_FLAG_SOM | LWSSS_FLAG_EOM;
m->count++;
lws_sul_schedule(lws_ss_get_context(m->ss), 0, &m->sul, txcb, RATE_US);
lwsl_user("%s: sending pkt %d\n", __func__, m->count);
return LWSSSSRET_OK;
}
static lws_ss_state_return_t
myss_state(void *userobj, void *sh, lws_ss_constate_t state,
lws_ss_tx_ordinal_t ack)
{
myss_t *m = (myss_t *)userobj;
struct lws_context *context = lws_ss_get_context(m->ss);
lwsl_user("%s: %s, ord 0x%x\n", __func__, lws_ss_state_name((int)state),
(unsigned int)ack);
switch (state) {
case LWSSSCS_CREATING:
return lws_ss_client_connect(m->ss);
case LWSSSCS_CONNECTED:
lws_sul_schedule(context, 0, &m->sul, txcb, RATE_US);
break;
case LWSSSCS_DISCONNECTED:
lws_sul_cancel(&m->sul);
break;
case LWSSSCS_ALL_RETRIES_FAILED:
/* if we're out of retries, we want to close the app and FAIL */
interrupted = 1;
break;
default:
break;
}
return 0;
}
static void
sigint_handler(int sig)
{
interrupted = 1;
}
static const lws_ss_info_t ssi = {
.handle_offset = offsetof(myss_t, ss),
.opaque_user_data_offset = offsetof(myss_t, opaque_data),
.rx = myss_rx,
.tx = myss_tx,
.state = myss_state,
.user_alloc = sizeof(myss_t),
.streamtype = "spam"
};
int main(int argc, const char **argv)
{
int n = 0, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE;
struct lws_context_creation_info info;
struct lws_context *context;
const char *p;
signal(SIGINT, sigint_handler);
if ((p = lws_cmdline_option(argc, argv, "-d")))
logs = atoi(p);
if ((p = lws_cmdline_option(argc, argv, "-c")))
reads = atoi(p);
lws_set_log_level(logs, NULL);
lwsl_user("LWS secure streams client TX [-d<verb>]\n");
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
info.options = LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
info.fd_limit_per_thread = 1 + 6 + 1;
info.port = CONTEXT_PORT_NO_LISTEN;
info.protocols = lws_sspc_protocols;
{
const char *p;
/* connect to ssproxy via UDS by default, else via
* tcp connection to this port */
if ((p = lws_cmdline_option(argc, argv, "-p")))
info.ss_proxy_port = (uint16_t)atoi(p);
/* UDS "proxy.ss.lws" in abstract namespace, else this socket
* path; when -p given this can specify the network interface
* to bind to */
if ((p = lws_cmdline_option(argc, argv, "-i")))
info.ss_proxy_bind = p;
/* if -p given, -a specifies the proxy address to connect to */
if ((p = lws_cmdline_option(argc, argv, "-a")))
info.ss_proxy_address = p;
}
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
goto bail1;
}
if (lws_ss_create(context, 0, &ssi, NULL, NULL, NULL, NULL)) {
lwsl_err("%s: create secure stream failed\n", __func__);
goto bail;
}
/* the event loop */
while (n >= 0 && !interrupted)
n = lws_service(context, 0);
bail:
lws_context_destroy(context);
bail1:
lwsl_user("Completed: %s\n", bad ? "failed" : "OK");
return bad;
}
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