Add a stroke attribute_handler requesting DNS servers given with leftdns

src/libcharon/plugins/stroke/Makefile.am

@@ -21,6 +21,7 @@ libstrongswan_stroke_la_SOURCES = \
 	stroke_cred.h stroke_cred.c \
 	stroke_ca.h stroke_ca.c \
 	stroke_attribute.h stroke_attribute.c \
+	stroke_handler.h stroke_handler.c \
 	stroke_list.h stroke_list.c
 
 libstrongswan_stroke_la_LDFLAGS = -module -avoid-version

src/libcharon/plugins/stroke/stroke_handler.c

@@ -0,0 +1,230 @@
+/*
+ * Copyright (C) 2012 Martin Willi
+ * Copyright (C) 2012 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 "stroke_handler.h"
+
+#include <daemon.h>
+#include <utils/linked_list.h>
+#include <threading/rwlock.h>
+
+typedef struct private_stroke_handler_t private_stroke_handler_t;
+
+/**
+ * Private data of an stroke_handler_t object.
+ */
+struct private_stroke_handler_t {
+
+	/**
+	 * Public stroke_handler_t interface.
+	 */
+	stroke_handler_t public;
+
+	/**
+	 * List of connection specific attributes, as attributes_t
+	 */
+	linked_list_t *attrs;
+
+	/**
+	 * rwlock to lock access to pools
+	 */
+	rwlock_t *lock;
+};
+
+/**
+ * Attributes assigned to a connection
+ */
+typedef struct {
+	/** name of the connection */
+	char *name;
+	/** list of DNS attributes, as host_t */
+	linked_list_t *dns;
+} attributes_t;
+
+/**
+ * Destroy an attributes_t entry
+ */
+static void attributes_destroy(attributes_t *this)
+{
+	this->dns->destroy_offset(this->dns, offsetof(host_t, destroy));
+	free(this->name);
+	free(this);
+}
+
+/**
+ * Filter function to convert host to DNS configuration attributes
+ */
+static bool attr_filter(void *lock, host_t **in,
+						configuration_attribute_type_t *type,
+						void *dummy, chunk_t *data)
+{
+	host_t *host = *in;
+
+	switch (host->get_family(host))
+	{
+		case AF_INET:
+			*type = INTERNAL_IP4_DNS;
+			break;
+		case AF_INET6:
+			*type = INTERNAL_IP6_DNS;
+			break;
+		default:
+			return FALSE;
+	}
+	if (host->is_anyaddr(host))
+	{
+		*data = chunk_empty;
+	}
+	else
+	{
+		*data = host->get_address(host);
+	}
+	return TRUE;
+}
+
+METHOD(attribute_handler_t, create_attribute_enumerator, enumerator_t*,
+	private_stroke_handler_t *this, identification_t *server, host_t *vip)
+{
+	ike_sa_t *ike_sa;
+	peer_cfg_t *peer_cfg;
+	enumerator_t *enumerator;
+	attributes_t *attr;
+
+	ike_sa = charon->bus->get_sa(charon->bus);
+	if (ike_sa)
+	{
+		peer_cfg = ike_sa->get_peer_cfg(ike_sa);
+		this->lock->read_lock(this->lock);
+		enumerator = this->attrs->create_enumerator(this->attrs);
+		while (enumerator->enumerate(enumerator, &attr))
+		{
+			if (streq(attr->name, peer_cfg->get_name(peer_cfg)))
+			{
+				enumerator->destroy(enumerator);
+				return enumerator_create_filter(
+									attr->dns->create_enumerator(attr->dns),
+									(void*)attr_filter, this->lock,
+									(void*)this->lock->unlock);
+			}
+		}
+		enumerator->destroy(enumerator);
+		this->lock->unlock(this->lock);
+	}
+	return enumerator_create_empty();
+}
+
+METHOD(stroke_handler_t, add_attributes, void,
+	private_stroke_handler_t *this, stroke_msg_t *msg)
+{
+	if (msg->add_conn.me.dns)
+	{
+		enumerator_t *enumerator;
+		attributes_t *attr = NULL;
+		host_t *host;
+		char *token;
+
+		enumerator = enumerator_create_token(msg->add_conn.me.dns, ",", " ");
+		while (enumerator->enumerate(enumerator, &token))
+		{
+			if (streq(token, "%config") || streq(token, "%config4"))
+			{
+				host = host_create_any(AF_INET);
+			}
+			else if (streq(token, "%config6"))
+			{
+				host = host_create_any(AF_INET6);
+			}
+			else
+			{
+				host = host_create_from_string(token, 0);
+			}
+			if (host)
+			{
+				if (!attr)
+				{
+					INIT(attr,
+						.name = strdup(msg->add_conn.name),
+						.dns = linked_list_create(),
+					);
+				}
+				attr->dns->insert_last(attr->dns, host);
+			}
+			else
+			{
+				DBG1(DBG_CFG, "ignoring invalid DNS address '%s'", token);
+			}
+		}
+		enumerator->destroy(enumerator);
+		if (attr)
+		{
+			this->lock->write_lock(this->lock);
+			this->attrs->insert_last(this->attrs, attr);
+			this->lock->unlock(this->lock);
+		}
+	}
+}
+
+METHOD(stroke_handler_t, del_attributes, void,
+	private_stroke_handler_t *this, stroke_msg_t *msg)
+{
+	enumerator_t *enumerator;
+	attributes_t *attr;
+
+	this->lock->write_lock(this->lock);
+	enumerator = this->attrs->create_enumerator(this->attrs);
+	while (enumerator->enumerate(enumerator, &attr))
+	{
+		if (streq(msg->del_conn.name, attr->name))
+		{
+			this->attrs->remove_at(this->attrs, enumerator);
+			attributes_destroy(attr);
+			break;
+		}
+	}
+	enumerator->destroy(enumerator);
+	this->lock->unlock(this->lock);
+}
+
+METHOD(stroke_handler_t, destroy, void,
+	private_stroke_handler_t *this)
+{
+	this->lock->destroy(this->lock);
+	this->attrs->destroy_function(this->attrs, (void*)attributes_destroy);
+	free(this);
+}
+
+/**
+ * See header
+ */
+stroke_handler_t *stroke_handler_create()
+{
+	private_stroke_handler_t *this;
+
+	INIT(this,
+		.public = {
+			.handler = {
+				.handle = (void*)return_false,
+				.release = (void*)return_false,
+				.create_attribute_enumerator = _create_attribute_enumerator,
+			},
+			.add_attributes = _add_attributes,
+			.del_attributes = _del_attributes,
+			.destroy = _destroy,
+		},
+		.attrs = linked_list_create(),
+		.lock = rwlock_create(RWLOCK_TYPE_DEFAULT),
+	);
+
+	return &this->public;
+}

src/libcharon/plugins/stroke/stroke_handler.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2012 Martin Willi
+ * Copyright (C) 2012 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 stroke_handler stroke_handler
+ * @{ @ingroup stroke
+ */
+
+#ifndef STROKE_HANDLER_H_
+#define STROKE_HANDLER_H_
+
+#include <stroke_msg.h>
+#include <attributes/attribute_handler.h>
+
+typedef struct stroke_handler_t stroke_handler_t;
+
+/**
+ * Handler requesting DNS attributes as defined with leftdns option.
+ */
+struct stroke_handler_t {
+
+	/**
+	 * Implements the attribute_handler_t interface
+	 */
+	attribute_handler_t handler;
+
+	/**
+	 * Add connection specific configuration attributes.
+	 *
+	 * @param msg		stroke message
+	 */
+	void (*add_attributes)(stroke_handler_t *this, stroke_msg_t *msg);
+
+	/**
+	 * Remove connection specific configuration attributes.
+	 *
+	 * @param msg		stroke message
+	 */
+	void (*del_attributes)(stroke_handler_t *this, stroke_msg_t *msg);
+
+	/**
+	 * Destroy a stroke_handler_t.
+	 */
+	void (*destroy)(stroke_handler_t *this);
+};
+
+/**
+ * Create a stroke_handler instance.
+ */
+stroke_handler_t *stroke_handler_create();
+
+#endif /** STROKE_HANDLER_H_ @}*/

src/libcharon/plugins/stroke/stroke_socket.c

@@ -37,6 +37,7 @@
 #include "stroke_cred.h"
 #include "stroke_ca.h"
 #include "stroke_attribute.h"
+#include "stroke_handler.h"
 #include "stroke_list.h"
 
 /**
@@ -98,6 +99,11 @@ struct private_stroke_socket_t {
 	 */
 	stroke_attribute_t *attribute;
 
+	/**
+	 * attribute handler (requests only)
+	 */
+	stroke_handler_t *handler;
+
 	/**
 	 * controller to control daemon
 	 */
@@ -238,6 +244,7 @@ static void stroke_add_conn(private_stroke_socket_t *this, stroke_msg_t *msg)
 
 	this->config->add(this->config, msg);
 	this->attribute->add_pool(this->attribute, msg);
+	this->handler->add_attributes(this->handler, msg);
 }
 
 /**
@@ -250,6 +257,7 @@ static void stroke_del_conn(private_stroke_socket_t *this, stroke_msg_t *msg)
 
 	this->config->del(this->config, msg);
 	this->attribute->del_pool(this->attribute, msg);
+	this->handler->del_attributes(this->handler, msg);
 }
 
 /**
@@ -789,10 +797,12 @@ METHOD(stroke_socket_t, destroy, void,
 	lib->credmgr->remove_set(lib->credmgr, &this->cred->set);
 	charon->backends->remove_backend(charon->backends, &this->config->backend);
 	hydra->attributes->remove_provider(hydra->attributes, &this->attribute->provider);
+	hydra->attributes->remove_handler(hydra->attributes, &this->handler->handler);
 	this->cred->destroy(this->cred);
 	this->ca->destroy(this->ca);
 	this->config->destroy(this->config);
 	this->attribute->destroy(this->attribute);
+	this->handler->destroy(this->handler);
 	this->control->destroy(this->control);
 	this->list->destroy(this->list);
 	free(this);
@@ -819,6 +829,7 @@ stroke_socket_t *stroke_socket_create()
 
 	this->cred = stroke_cred_create();
 	this->attribute = stroke_attribute_create();
+	this->handler = stroke_handler_create();
 	this->ca = stroke_ca_create(this->cred);
 	this->config = stroke_config_create(this->ca, this->cred);
 	this->control = stroke_control_create();
@@ -835,6 +846,7 @@ stroke_socket_t *stroke_socket_create()
 	lib->credmgr->add_set(lib->credmgr, &this->cred->set);
 	charon->backends->add_backend(charon->backends, &this->config->backend);
 	hydra->attributes->add_provider(hydra->attributes, &this->attribute->provider);
+	hydra->attributes->add_handler(hydra->attributes, &this->handler->handler);
 
 	lib->processor->queue_job(lib->processor,
 		(job_t*)callback_job_create_with_prio((callback_job_cb_t)receive, this,