An Android specific attribute handler installs DNS servers via Builder

src/frontends/android/jni/libandroidbridge/Android.mk

@@ -4,6 +4,7 @@ include $(CLEAR_VARS)
 # copy-n-paste from Makefile.am
 LOCAL_SRC_FILES := \
 android_jni.c android_jni.h \
+backend/android_attr.c backend/android_attr.h \
 backend/android_creds.c backend/android_creds.h \
 backend/android_service.c backend/android_service.h \
 charonservice.c charonservice.h \

src/frontends/android/jni/libandroidbridge/backend/android_attr.c

@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012 Giuliano Grassi
+ * Copyright (C) 2012 Ralf Sager
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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 "android_attr.h"
+#include "../charonservice.h"
+
+#include <hydra.h>
+#include <debug.h>
+#include <library.h>
+
+typedef struct private_android_attr_t private_android_attr_t;
+
+/**
+ * Private data of an android_attr_t object.
+ */
+struct private_android_attr_t {
+
+	/**
+	 * Public interface.
+	 */
+	android_attr_t public;
+};
+
+METHOD(attribute_handler_t, handle, bool,
+	private_android_attr_t *this, identification_t *server,
+	configuration_attribute_type_t type, chunk_t data)
+{
+	vpnservice_builder_t *builder;
+	host_t *dns;
+
+	switch (type)
+	{
+		case INTERNAL_IP4_DNS:
+			dns = host_create_from_chunk(AF_INET, data, 0);
+			break;
+		default:
+			return FALSE;
+	}
+
+	if (!dns || dns->is_anyaddr(dns))
+	{
+		DESTROY_IF(dns);
+		return FALSE;
+	}
+
+	builder = charonservice->get_vpnservice_builder(charonservice);
+	builder->add_dns(builder, dns);
+	dns->destroy(dns);
+	return TRUE;
+}
+
+METHOD(attribute_handler_t, release, void,
+	private_android_attr_t *this, identification_t *server,
+	configuration_attribute_type_t type, chunk_t data)
+{
+	/* DNS servers cannot be removed from an existing TUN device */
+}
+
+METHOD(enumerator_t, enumerate_dns, bool,
+	enumerator_t *this, configuration_attribute_type_t *type, chunk_t *data)
+{
+	*type = INTERNAL_IP4_DNS;
+	*data = chunk_empty;
+	this->enumerate = (void*)return_false;
+	return TRUE;
+}
+
+METHOD(attribute_handler_t, create_attribute_enumerator, enumerator_t*,
+	private_android_attr_t *this, identification_t *server, host_t *vip)
+{
+	enumerator_t *enumerator;
+
+	INIT(enumerator,
+			.enumerate = (void*)_enumerate_dns,
+			.destroy = (void*)free,
+	);
+	return enumerator;
+}
+
+METHOD(android_attr_t, destroy, void,
+	private_android_attr_t *this)
+{
+	free(this);
+}
+
+/**
+ * Described in header
+ */
+android_attr_t *android_attr_create()
+{
+	private_android_attr_t *this;
+
+	INIT(this,
+		.public = {
+			.handler = {
+				.handle = _handle,
+				.release = _release,
+				.create_attribute_enumerator = _create_attribute_enumerator,
+			},
+			.destroy = _destroy,
+		},
+	);
+
+	return &this->public;
+}
+

src/frontends/android/jni/libandroidbridge/backend/android_attr.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2012 Giuliano Grassi
+ * Copyright (C) 2012 Ralf Sager
+ * Hochschule fuer Technik Rapperswil
+ *
+ * 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 android_attr android_attr
+ * @{ @ingroup android_backend
+ */
+
+#ifndef ANDROID_ATTR_H_
+#define ANDROID_ATTR_H_
+
+#include <library.h>
+#include <attributes/attribute_handler.h>
+
+typedef struct android_attr_t android_attr_t;
+
+/**
+ * Handler for DNS configuration
+ */
+struct android_attr_t {
+
+	/**
+	 * implements the attribute_handler_t interface
+	 */
+	attribute_handler_t handler;
+
+	/**
+	 * Destroy a android_attr_t
+	 */
+	void (*destroy)(android_attr_t *this);
+};
+
+/**
+ * Create a android_attr_t instance.
+ */
+android_attr_t *android_attr_create(void);
+
+#endif /** ANDROID_ATTR_H_ @}*/
+

src/frontends/android/jni/libandroidbridge/charonservice.c

@@ -21,6 +21,7 @@
 
 #include "charonservice.h"
 #include "android_jni.h"
+#include "backend/android_attr.h"
 #include "backend/android_creds.h"
 #include "backend/android_service.h"
 #include "kernel/android_ipsec.h"
@@ -46,6 +47,11 @@ struct private_charonservice_t {
 	 */
 	charonservice_t public;
 
+	/**
+	 * android_attr instance
+	 */
+	android_attr_t *attr;
+
 	/**
 	 * android_creds instance
 	 */
@@ -243,10 +249,14 @@ static bool charonservice_register(void *plugin, plugin_feature_t *feature,
 	if (reg)
 	{
 		lib->credmgr->add_set(lib->credmgr, &this->creds->set);
+		hydra->attributes->add_handler(hydra->attributes,
+									   &this->attr->handler);
 	}
 	else
 	{
 		lib->credmgr->remove_set(lib->credmgr, &this->creds->set);
+		hydra->attributes->remove_handler(hydra->attributes,
+										  &this->attr->handler);
 		if (this->service)
 		{
 			this->service->destroy(this->service);
@@ -279,6 +289,7 @@ static void charonservice_init(JNIEnv *env, jobject service, jobject builder)
 			.get_trusted_certificates = _get_trusted_certificates,
 			.get_vpnservice_builder = _get_vpnservice_builder,
 		},
+		.attr = android_attr_create(),
 		.creds = android_creds_create(),
 		.builder = vpnservice_builder_create(builder),
 		.vpn_service = (*env)->NewGlobalRef(env, service),
@@ -301,6 +312,7 @@ static void charonservice_deinit(JNIEnv *env)
 
 	this->builder->destroy(this->builder);
 	this->creds->destroy(this->creds);
+	this->attr->destroy(this->attr);
 	(*env)->DeleteGlobalRef(env, this->vpn_service);
 	free(this);
 	charonservice = NULL;