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/*
* lws-minimal-raw-vhost
*
* 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 integrating a raw tcp listener into the lws event loop.
*
* This demo doesn't have any http or ws support. You can connect to it
* using netcat. If you make multiple connections to it, things typed in one
* netcat session are broadcast to all netcat connections.
*
* $ nc localhost 7681
*
* You can add more vhosts with things like http or ws support, it's as it is
* for clarity.
*
* The main point is the apis and ways of managing raw sockets are almost
* identical to http or ws mode sockets in lws. The callback names for raw
* wsi are changed to be specific to RAW mode is all.
*/
#include <libwebsockets.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
struct raw_pss {
struct raw_pss *pss_list;
struct lws *wsi;
};
/* one of these is created for each vhost our protocol is used with */
struct raw_vhd {
struct raw_pss *pss_list; /* linked-list of live pss*/
int len;
uint8_t buf[4096];
};
static int
callback_raw_test(struct lws *wsi, enum lws_callback_reasons reason,
void *user, void *in, size_t len)
{
struct raw_pss *pss = (struct raw_pss *)user;
struct raw_vhd *vhd = (struct raw_vhd *)lws_protocol_vh_priv_get(
lws_get_vhost(wsi), lws_get_protocol(wsi));
switch (reason) {
case LWS_CALLBACK_PROTOCOL_INIT:
lws_protocol_vh_priv_zalloc(lws_get_vhost(wsi),
lws_get_protocol(wsi), sizeof(struct raw_vhd));
break;
case LWS_CALLBACK_PROTOCOL_DESTROY:
break;
/* callbacks related to raw socket descriptor */
case LWS_CALLBACK_RAW_ADOPT:
lwsl_user("LWS_CALLBACK_RAW_ADOPT\n");
pss->wsi = wsi;
lws_ll_fwd_insert(pss, pss_list, vhd->pss_list);
break;
case LWS_CALLBACK_RAW_CLOSE:
lwsl_user("LWS_CALLBACK_RAW_CLOSE\n");
lws_ll_fwd_remove(struct raw_pss, pss_list, pss, vhd->pss_list);
break;
case LWS_CALLBACK_RAW_RX:
lwsl_user("LWS_CALLBACK_RAW_RX: %d\n", (int)len);
vhd->len = (int)len;
if (vhd->len > (int)sizeof(vhd->buf))
vhd->len = sizeof(vhd->buf);
memcpy(vhd->buf, in, (unsigned int)vhd->len);
lws_start_foreach_llp(struct raw_pss **, ppss, vhd->pss_list) {
lws_callback_on_writable((*ppss)->wsi);
} lws_end_foreach_llp(ppss, pss_list);
break;
case LWS_CALLBACK_RAW_WRITEABLE:
if (lws_write(wsi, vhd->buf, (unsigned int)vhd->len, LWS_WRITE_RAW) !=
vhd->len) {
lwsl_notice("%s: raw write failed\n", __func__);
return 1;
}
break;
default:
break;
}
return lws_callback_http_dummy(wsi, reason, user, in, len);
}
static struct lws_protocols protocols[] = {
{ "raw-test", callback_raw_test, sizeof(struct raw_pss), 0, 0, NULL, 0 },
LWS_PROTOCOL_LIST_TERM
};
static int interrupted;
void sigint_handler(int sig)
{
interrupted = 1;
}
int main(int argc, const char **argv)
{
struct lws_context_creation_info info;
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 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 raw vhost | nc localhost 7681\n");
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
info.port = 7681;
info.protocols = protocols;
info.options = LWS_SERVER_OPTION_ONLY_RAW; /* vhost accepts RAW */
#if defined(LWS_WITH_TLS)
if (lws_cmdline_option(argc, argv, "-s")) {
info.options |= LWS_SERVER_OPTION_DO_SSL_GLOBAL_INIT;
info.ssl_cert_filepath = "localhost-100y.cert";
info.ssl_private_key_filepath = "localhost-100y.key";
}
#endif
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
return 1;
}
while (n >= 0 && !interrupted)
n = lws_service(context, 0);
lws_context_destroy(context);
return 0;
}
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