stream: add a manager to dynamically register streams and services

src/libstrongswan/Android.mk

@@ -27,7 +27,7 @@ database/database_factory.c fetcher/fetcher.c fetcher/fetcher_manager.c eap/eap.
 ipsec/ipsec_types.c \
 networking/host.c networking/host_resolver.c networking/packet.c \
 networking/tun_device.c networking/streams/stream.c \
-networking/streams/stream_service.c \
+networking/streams/stream_service.c networking/streams/stream_manager.c \
 pen/pen.c plugins/plugin_loader.c plugins/plugin_feature.c processing/jobs/job.c \
 processing/jobs/callback_job.c processing/processor.c processing/scheduler.c \
 processing/watcher.c resolver/resolver_manager.c resolver/rr_set.c \

src/libstrongswan/Makefile.am

@@ -25,7 +25,7 @@ database/database_factory.c fetcher/fetcher.c fetcher/fetcher_manager.c eap/eap.
 ipsec/ipsec_types.c \
 networking/host.c networking/host_resolver.c networking/packet.c \
 networking/tun_device.c networking/streams/stream.c \
-networking/streams/stream_service.c \
+networking/streams/stream_service.c networking/streams/stream_manager.c \
 pen/pen.c plugins/plugin_loader.c plugins/plugin_feature.c processing/jobs/job.c \
 processing/jobs/callback_job.c processing/processor.c processing/scheduler.c \
 processing/watcher.c resolver/resolver_manager.c resolver/rr_set.c \
@@ -67,7 +67,7 @@ database/database.h database/database_factory.h fetcher/fetcher.h \
 fetcher/fetcher_manager.h eap/eap.h pen/pen.h ipsec/ipsec_types.h \
 networking/host.h networking/host_resolver.h networking/packet.h \
 networking/tun_device.h networking/streams/stream.h \
-networking/streams/stream_service.h \
+networking/streams/stream_service.h networking/streams/stream_manager.h \
 resolver/resolver.h resolver/resolver_response.h resolver/rr_set.h \
 resolver/rr.h resolver/resolver_manager.h \
 plugins/plugin_loader.h plugins/plugin.h plugins/plugin_feature.h \

src/libstrongswan/networking/streams/stream_manager.c

@@ -0,0 +1,282 @@
+/*
+ * Copyright (C) 2013 Martin Willi
+ * Copyright (C) 2013 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+#include "stream_manager.h"
+
+#include <threading/rwlock.h>
+
+typedef struct private_stream_manager_t private_stream_manager_t;
+
+/**
+ * Private data of an stream_manager_t object.
+ */
+struct private_stream_manager_t {
+
+	/**
+	 * Public stream_manager_t interface.
+	 */
+	stream_manager_t public;
+
+	/**
+	 * List of registered stream constructors, as stream_entry_t
+	 */
+	linked_list_t *streams;
+
+	/**
+	 * List of registered service constructors, as service_entry_t
+	 */
+	linked_list_t *services;
+
+	/**
+	 * List of registered running services, as running_entry_t
+	 */
+	linked_list_t *running;
+
+	/**
+	 * Lock for all lists
+	 */
+	rwlock_t *lock;
+};
+
+/**
+ * Registered stream backend
+ */
+typedef struct {
+	/** URI prefix */
+	char *prefix;
+	/** constructor function */
+	stream_constructor_t create;
+} stream_entry_t;
+
+/**
+ * Registered service backend
+ */
+typedef struct {
+	/** URI prefix */
+	char *prefix;
+	/** constructor function */
+	stream_service_constructor_t create;
+} service_entry_t;
+
+/**
+ * Running service
+ */
+typedef struct {
+	/** URI of service */
+	char *uri;
+	/** stream accept()ing connections */
+	stream_service_t *service;
+} running_entry_t;
+
+METHOD(stream_manager_t, connect_, stream_t*,
+	private_stream_manager_t *this, char *uri)
+{
+	enumerator_t *enumerator;
+	stream_entry_t *entry;
+	stream_t *stream = NULL;
+
+	this->lock->read_lock(this->lock);
+	enumerator = this->streams->create_enumerator(this->streams);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (strpfx(uri, entry->prefix))
+		{
+			stream = entry->create(uri);
+			if (stream)
+			{
+				break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+
+	return stream;
+}
+
+METHOD(stream_manager_t, start_service, bool,
+	private_stream_manager_t *this, char *uri,
+	stream_service_cb_t cb, void *data)
+{
+	running_entry_t *running;
+	enumerator_t *enumerator;
+	service_entry_t *entry;
+	stream_service_t *service = NULL;
+
+	this->lock->read_lock(this->lock);
+	enumerator = this->services->create_enumerator(this->services);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (strpfx(uri, entry->prefix))
+		{
+			service = entry->create(uri);
+			if (service)
+			{
+				break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+
+	if (!service)
+	{
+		return FALSE;
+	}
+
+	INIT(running,
+		.uri = strdup(uri),
+		.service = service,
+	);
+	service->on_accept(service, cb, data);
+
+	this->lock->write_lock(this->lock);
+	this->running->insert_last(this->running, running);
+	this->lock->unlock(this->lock);
+
+	return TRUE;
+}
+
+METHOD(stream_manager_t, stop_service, void,
+	private_stream_manager_t *this, char *uri)
+{
+	enumerator_t *enumerator;
+	running_entry_t *entry;
+
+	this->lock->write_lock(this->lock);
+	enumerator = this->running->create_enumerator(this->running);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (streq(entry->uri, uri))
+		{
+			this->running->remove_at(this->running, enumerator);
+			entry->service->destroy(entry->service);
+			free(entry->uri);
+			free(entry);
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+}
+
+METHOD(stream_manager_t, add_stream, void,
+	private_stream_manager_t *this, char *prefix, stream_constructor_t create)
+{
+	stream_entry_t *entry;
+
+	INIT(entry,
+		.prefix = strdup(prefix),
+		.create = create,
+	);
+
+	this->lock->write_lock(this->lock);
+	this->streams->insert_last(this->streams, entry);
+	this->lock->unlock(this->lock);
+}
+
+METHOD(stream_manager_t, remove_stream, void,
+	private_stream_manager_t *this, stream_constructor_t create)
+{
+	enumerator_t *enumerator;
+	stream_entry_t *entry;
+
+	this->lock->write_lock(this->lock);
+	enumerator = this->streams->create_enumerator(this->streams);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (entry->create == create)
+		{
+			this->streams->remove_at(this->streams, enumerator);
+			free(entry->prefix);
+			free(entry);
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+}
+
+METHOD(stream_manager_t, add_service, void,
+	private_stream_manager_t *this, char *prefix,
+	stream_service_constructor_t create)
+{
+	service_entry_t *entry;
+
+	INIT(entry,
+		.prefix = strdup(prefix),
+		.create = create,
+	);
+
+	this->lock->write_lock(this->lock);
+	this->services->insert_last(this->services, entry);
+	this->lock->unlock(this->lock);
+}
+
+METHOD(stream_manager_t, remove_service, void,
+	private_stream_manager_t *this, stream_service_constructor_t create)
+{
+	enumerator_t *enumerator;
+	service_entry_t *entry;
+
+	this->lock->write_lock(this->lock);
+	enumerator = this->services->create_enumerator(this->services);
+	while (enumerator->enumerate(enumerator, &entry))
+	{
+		if (entry->create == create)
+		{
+			this->services->remove_at(this->services, enumerator);
+			free(entry->prefix);
+			free(entry);
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+}
+
+METHOD(stream_manager_t, destroy, void,
+	private_stream_manager_t *this)
+{
+	this->streams->destroy(this->streams);
+	this->services->destroy(this->services);
+	this->running->destroy(this->running);
+	this->lock->destroy(this->lock);
+	free(this);
+}
+
+/**
+ * See header
+ */
+stream_manager_t *stream_manager_create()
+{
+	private_stream_manager_t *this;
+
+	INIT(this,
+		.public = {
+			.connect = _connect_,
+			.start_service = _start_service,
+			.stop_service = _stop_service,
+			.add_stream = _add_stream,
+			.remove_stream = _remove_stream,
+			.add_service = _add_service,
+			.remove_service = _remove_service,
+			.destroy = _destroy,
+		},
+		.streams = linked_list_create(),
+		.services = linked_list_create(),
+		.running = linked_list_create(),
+		.lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
+	);
+
+	return &this->public;
+}

src/libstrongswan/networking/streams/stream_manager.h

@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2013 Martin Willi
+ * Copyright (C) 2013 revosec AG
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * for more details.
+ */
+
+/**
+ * @defgroup stream_manager stream_manager
+ * @{ @ingroup streams
+ */
+
+#ifndef STREAM_MANAGER_H_
+#define STREAM_MANAGER_H_
+
+typedef struct stream_manager_t stream_manager_t;
+
+#include <networking/streams/stream.h>
+#include <networking/streams/stream_service.h>
+
+/**
+ * Manages client-server connections and services using stream_t backends.
+ */
+struct stream_manager_t {
+
+	/**
+	 * Create a client-server connection to a service.
+	 *
+	 * @param uri		URI of service to connect to
+	 * @return			stream instance, NULL on error
+	 */
+	stream_t* (*connect)(stream_manager_t *this, char *uri);
+
+	/**
+	 * Start a new service under an URI, accept()ing client connections.
+	 *
+	 * @param uri		URI of service to provide
+	 * @param cb		callback function invoked for each client connection
+	 * @param data		user data to pass to callback
+	 * @return			TRUE if service started, FALSE on failure
+	 */
+	bool (*start_service)(stream_manager_t *this, char *uri,
+						  stream_service_cb_t cb, void *data);
+
+	/**
+	 * Stop a service previously create with start_service().
+	 *
+	 * @param uri		URI of service to stop
+	 */
+	void (*stop_service)(stream_manager_t *this, char *uri);
+
+	/**
+	 * Register a stream backend to the manager.
+	 *
+	 * @param prefix	prefix of URIs to use the backend for
+	 * @param create	constructor function for the stream
+	 */
+	void (*add_stream)(stream_manager_t *this, char *prefix,
+					   stream_constructor_t create);
+
+	/**
+	 * Unregister stream backends from the manager.
+	 *
+	 * @param create	constructor function passed to add_stream()
+	 */
+	void (*remove_stream)(stream_manager_t *this, stream_constructor_t create);
+
+	/**
+	 * Register a stream service backend to the manager.
+	 *
+	 * @param prefix	prefix of URIs to use the backend for
+	 * @param create	constructor function for the stream service
+	 */
+	void (*add_service)(stream_manager_t *this, char *prefix,
+						stream_service_constructor_t create);
+
+	/**
+	 * Unregister stream service backends from the manager.
+	 *
+	 * @param create	constructor function passed to add_service()
+	 */
+	void (*remove_service)(stream_manager_t *this,
+						   stream_service_constructor_t create);
+
+	/**
+	 * Destroy a stream_manager_t.
+	 */
+	void (*destroy)(stream_manager_t *this);
+};
+
+/**
+ * Create a stream_manager instance.
+ */
+stream_manager_t *stream_manager_create();
+
+#endif /** STREAM_MANAGER_H_ @}*/