/*
 * lws-minimal-raw-proxy
 *
 * 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 a vhost that acts as a raw tcp proxy.  Incoming connections
 * cause an outgoing connection to be initiated, and if successfully established
 * then traffic coming in one side is placed on a ringbuffer and sent out the
 * opposite side as soon as possible.
 */

#include <libwebsockets.h>

enum {
	LWS_SW_D,
	LWS_SW_R,
	LWS_SW_HELP,
};

static const struct lws_switches switches[] = {
	[LWS_SW_D]	= { "-d",              "Debug logs (e.g. -d 15)" },
	[LWS_SW_R]	= { "-r",              "Enable -r feature" },
	[LWS_SW_HELP]	= { "--help",		"Show this help information" },
};

#include <string.h>
#include <signal.h>
#include <sys/types.h>

#if defined(LWS_WITH_PLUGINS)
static const char * const plugin_dirs[] = {
	LWS_PLUGIN_DIR "/",
	NULL
};
#endif

static int interrupted;

void sigint_handler(int sig)
{
	interrupted = 1;
}

static struct lws_protocol_vhost_options pvo1 = {
        NULL,
        NULL,
        "onward",          /* pvo name */
        "ipv4:127.0.0.1:22"    /* pvo value */
};

static const struct lws_protocol_vhost_options pvo = {
        NULL,           /* "next" pvo linked-list */
        &pvo1,       /* "child" pvo linked-list */
        "raw-proxy",      /* protocol name we belong to on this vhost */
        ""              /* ignored */
};


int main(int argc, const char **argv)
{
	int n = 0;
	struct lws_context_creation_info info;
	struct lws_context *context;
	char outward[256];
	const char *p;
	(void)switches;

	if ((argc == 1) || lws_cmdline_option(argc, argv, switches[LWS_SW_HELP].sw)) {
		lws_switches_print_help(argv[0], switches, LWS_ARRAY_SIZE(switches));
		return 0;
	}


	signal(SIGINT, sigint_handler);


	lwsl_user("LWS minimal raw proxy\n");

	if ((p = lws_cmdline_option(argc, argv, switches[LWS_SW_R].sw))) {
		lws_strncpy(outward, p, sizeof(outward));
		pvo1.value = outward;
	}

	lws_context_info_defaults(&info, NULL);
	lws_cmdline_option_handle_builtin(argc, argv, &info);
	info.port = 7681;
	info.pvo = &pvo;
#if defined(LWS_WITH_PLUGINS)
	info.plugin_dirs = plugin_dirs;
#endif
	info.options = LWS_SERVER_OPTION_ADOPT_APPLY_LISTEN_ACCEPT_CONFIG;
	info.listen_accept_role = "raw-proxy";
	info.listen_accept_protocol = "raw-proxy";

	context = lws_create_context(&info);
	if (!context) {
		lwsl_err("lws init failed\n");
		return 1;
	}

	if (!lws_vhost_name_to_protocol(lws_get_vhost_by_name(context, "default"), "raw-proxy")) {
		lwsl_err("raw-proxy plugin required\n");
		return 1;
	}

	while (n >= 0 && !interrupted)
		n = lws_service(context, 0);

	lws_context_destroy(context);

	return 0;
}
