libwebsockets/test-server/test-server-libev.c

/*
 * libwebsockets-test-server - libwebsockets test implementation
 *
 * Copyright (C) 2011-2016 Andy Green <andy@warmcat.com>
 *
 * This file is made available under the Creative Commons CC0 1.0
 * Universal Public Domain Dedication.
 *
 * The person who associated a work with this deed has dedicated
 * the work to the public domain by waiving all of his or her rights
 * to the work worldwide under copyright law, including all related
 * and neighboring rights, to the extent allowed by law. You can copy,
 * modify, distribute and perform the work, even for commercial purposes,
 * all without asking permission.
 *
 * The test apps are intended to be adapted for use in your code, which
 * may be proprietary.  So unlike the library itself, they are licensed
 * Public Domain.
 */
#include "test-server.h"

int close_testing;
int max_poll_elements;
int debug_level = 7;
volatile int force_exit = 0;
struct lws_context *context;
struct lws_plat_file_ops fops_plat;

/* http server gets files from this path */
#define LOCAL_RESOURCE_PATH INSTALL_DATADIR"/libwebsockets-test-server"
char *resource_path = LOCAL_RESOURCE_PATH;

/*
 * libev dumps their hygiene problems on their users blaming compiler
 * http://lists.schmorp.de/pipermail/libev/2008q4/000442.html
 */

#if EV_MINPRI == EV_MAXPRI
# define _ev_set_priority(ev, pri) ((ev), (pri))
#else
# define _ev_set_priority(ev, pri) { \
	ev_watcher *evw = (ev_watcher *)(void *)ev; \
	evw->priority = pri; \
}
#endif

#define _ev_init(ev,cb_) {  \
	ev_watcher *evw = (ev_watcher *)(void *)ev; \
\
	evw->active = evw->pending = 0; \
	_ev_set_priority((ev), 0); \
	ev_set_cb((ev), cb_); \
}

#define _ev_timer_init(ev, cb, after, _repeat) { \
	ev_watcher_time *evwt = (ev_watcher_time *)(void *)ev; \
\
	_ev_init(ev, cb); \
	evwt->at = after; \
	(ev)->repeat = _repeat; \
}

/* singlethreaded version --> no locks */

void test_server_lock(int care)
{
}
void test_server_unlock(int care)
{
}

/*
 * This demo server shows how to use libwebsockets for one or more
 * websocket protocols in the same server
 *
 * It defines the following websocket protocols:
 *
 *  dumb-increment-protocol:  once the socket is opened, an incrementing
 *				ascii string is sent down it every 50ms.
 *				If you send "reset\n" on the websocket, then
 *				the incrementing number is reset to 0.
 *
 *  lws-mirror-protocol: copies any received packet to every connection also
 *				using this protocol, including the sender
 */

enum demo_protocols {
	/* always first */
	PROTOCOL_HTTP = 0,

	PROTOCOL_DUMB_INCREMENT,
	PROTOCOL_LWS_MIRROR,

	/* always last */
	DEMO_PROTOCOL_COUNT
};

/* list of supported protocols and callbacks */

static struct lws_protocols protocols[] = {
	/* first protocol must always be HTTP handler */

	{
		"http-only",		/* name */
		callback_http,		/* callback */
		sizeof (struct per_session_data__http),	/* per_session_data_size */
		0,			/* max frame size / rx buffer */
	},
	{
		"dumb-increment-protocol",
		callback_dumb_increment,
		sizeof(struct per_session_data__dumb_increment),
		10,
	},
	{
		"lws-mirror-protocol",
		callback_lws_mirror,
		sizeof(struct per_session_data__lws_mirror),
		128,
	},
	{ NULL, NULL, 0, 0 } /* terminator */
};

static const struct lws_extension exts[] = {
	{
		"permessage-deflate",
		lws_extension_callback_pm_deflate,
		"permessage-deflate; client_no_context_takeover; client_max_window_bits"
	},
	{
		"deflate-frame",
		lws_extension_callback_pm_deflate,
		"deflate_frame"
	},
	{ NULL, NULL, NULL /* terminator */ }
};

/* this shows how to override the lws file operations.  You don't need
 * to do any of this unless you have a reason (eg, want to serve
 * compressed files without decompressing the whole archive)
 */
static lws_filefd_type
test_server_fops_open(struct lws *wsi, const char *filename,
		      unsigned long *filelen, int flags)
{
	lws_filefd_type n;

	/* call through to original platform implementation */
	n = fops_plat.open(wsi, filename, filelen, flags);

	lwsl_notice("%s: opening %s, ret %ld, len %lu\n", __func__, filename,
			(long)n, *filelen);

	return n;
}

void signal_cb(struct ev_loop *loop, struct ev_signal* watcher, int revents)
{
	lwsl_notice("Signal caught, exiting...\n");
	force_exit = 1;
	switch (watcher->signum) {
	case SIGTERM:
	case SIGINT:
		ev_break(loop, EVBREAK_ALL);
		break;
	default:
		signal(SIGABRT, SIG_DFL);
		abort();
		break;
	}
}

static void
ev_timeout_cb (EV_P_ ev_timer *w, int revents)
{
	lws_callback_on_writable_all_protocol(context,
					&protocols[PROTOCOL_DUMB_INCREMENT]);
}

static struct option options[] = {
	{ "help",	no_argument,		NULL, 'h' },
	{ "debug",	required_argument,	NULL, 'd' },
	{ "port",	required_argument,	NULL, 'p' },
	{ "ssl",	no_argument,		NULL, 's' },
	{ "allow-non-ssl",	no_argument,	NULL, 'a' },
	{ "interface",  required_argument,	NULL, 'i' },
	{ "closetest",  no_argument,		NULL, 'c' },
	{ "libev",  no_argument,		NULL, 'e' },
#ifndef LWS_NO_DAEMONIZE
	{ "daemonize", 	no_argument,		NULL, 'D' },
#endif
	{ "resource_path", required_argument,	NULL, 'r' },
	{ NULL, 0, 0, 0 }
};

int main(int argc, char **argv)
{
	int sigs[] = { SIGINT, SIGKILL, SIGTERM, SIGSEGV, SIGFPE };
	struct ev_signal signals[ARRAY_SIZE(sigs)];
	struct ev_loop *loop = ev_default_loop(0);
	struct lws_context_creation_info info;
	char interface_name[128] = "";
	const char *iface = NULL;
	ev_timer timeout_watcher;
	char cert_path[1024];
	char key_path[1024];
	int use_ssl = 0;
	int opts = 0;
	int n = 0;
#ifndef _WIN32
	int syslog_options = LOG_PID | LOG_PERROR;
#endif
#ifndef LWS_NO_DAEMONIZE
	int daemonize = 0;
#endif

	/*
	 * take care to zero down the info struct, he contains random garbaage
	 * from the stack otherwise
	 */
	memset(&info, 0, sizeof info);
	info.port = 7681;

	while (n >= 0) {
		n = getopt_long(argc, argv, "eci:hsap:d:Dr:", options, NULL);
		if (n < 0)
			continue;
		switch (n) {
		case 'e':
			opts |= LWS_SERVER_OPTION_LIBEV;
			break;
#ifndef LWS_NO_DAEMONIZE
		case 'D':
			daemonize = 1;
			#ifndef _WIN32
			syslog_options &= ~LOG_PERROR;
			#endif
			break;
#endif
		case 'd':
			debug_level = atoi(optarg);
			break;
		case 's':
			use_ssl = 1;
			break;
		case 'a':
			opts |= LWS_SERVER_OPTION_ALLOW_NON_SSL_ON_SSL_PORT;
			break;
		case 'p':
			info.port = atoi(optarg);
			break;
		case 'i':
			strncpy(interface_name, optarg, sizeof interface_name);
			interface_name[(sizeof interface_name) - 1] = '\0';
			iface = interface_name;
			break;
		case 'c':
			close_testing = 1;
			fprintf(stderr, " Close testing mode -- closes on "
					   "client after 50 dumb increments"
					   "and suppresses lws_mirror spam\n");
			break;
		case 'r':
			resource_path = optarg;
			printf("Setting resource path to \"%s\"\n", resource_path);
			break;
		case 'h':
			fprintf(stderr, "Usage: test-server "
					"[--port=<p>] [--ssl] "
					"[-d <log bitfield>] "
					"[--resource_path <path>]\n");
			exit(1);
		}
	}

#if !defined(LWS_NO_DAEMONIZE) && !defined(WIN32)
	/*
	 * normally lock path would be /var/lock/lwsts or similar, to
	 * simplify getting started without having to take care about
	 * permissions or running as root, set to /tmp/.lwsts-lock
	 */
	if (daemonize && lws_daemonize("/tmp/.lwsts-lock")) {
		fprintf(stderr, "Failed to daemonize\n");
		return 1;
	}
#endif

	for (n = 0; n < ARRAY_SIZE(sigs); n++) {
		_ev_init(&signals[n], signal_cb);
		ev_signal_set(&signals[n], sigs[n]);
		ev_signal_start(loop, &signals[n]);
	}

#ifndef _WIN32
	/* we will only try to log things according to our debug_level */
	setlogmask(LOG_UPTO (LOG_DEBUG));
	openlog("lwsts", syslog_options, LOG_DAEMON);
#endif

	/* tell the library what debug level to emit and to send it to syslog */
	lws_set_log_level(debug_level, lwsl_emit_syslog);

	lwsl_notice("libwebsockets test server libev - license LGPL2.1+SLE\n");
	lwsl_notice("(C) Copyright 2010-2016 Andy Green <andy@warmcat.com>\n");

	printf("Using resource path \"%s\"\n", resource_path);

	info.iface = iface;
	info.protocols = protocols;
	info.extensions = exts;

	info.ssl_cert_filepath = NULL;
	info.ssl_private_key_filepath = NULL;

	if (use_ssl) {
		if (strlen(resource_path) > sizeof(cert_path) - 32) {
			lwsl_err("resource path too long\n");
			return -1;
		}
		sprintf(cert_path, "%s/libwebsockets-test-server.pem",
								resource_path);
		if (strlen(resource_path) > sizeof(key_path) - 32) {
			lwsl_err("resource path too long\n");
			return -1;
		}
		sprintf(key_path, "%s/libwebsockets-test-server.key.pem",
								resource_path);

		info.ssl_cert_filepath = cert_path;
		info.ssl_private_key_filepath = key_path;
	}
	info.gid = -1;
	info.uid = -1;
	info.max_http_header_pool = 1;
	info.options = opts | LWS_SERVER_OPTION_LIBEV;

	context = lws_create_context(&info);
	if (context == NULL) {
		lwsl_err("libwebsocket init failed\n");
		return -1;
	}

	/*
	 * this shows how to override the lws file operations.  You don't need
	 * to do any of this unless you have a reason (eg, want to serve
	 * compressed files without decompressing the whole archive)
	 */
	/* stash original platform fops */
	fops_plat = *(lws_get_fops(context));
	/* override the active fops */
	lws_get_fops(context)->open = test_server_fops_open;

	lws_ev_initloop(context, loop, 0);

	_ev_timer_init(&timeout_watcher, ev_timeout_cb, 0.05, 0.05);
	ev_timer_start(loop, &timeout_watcher);
	ev_run(loop, 0);

	lws_context_destroy(context);
	lwsl_notice("libwebsockets-test-server exited cleanly\n");

#ifndef _WIN32
	closelog();
#endif

	return 0;
}