implemented the Forwarding Enabled attribute

src/libimcv/Makefile.am

@@ -12,6 +12,7 @@ libimcv_la_SOURCES = \
 	ietf/ietf_attr.h ietf/ietf_attr.c \
 	ietf/ietf_attr_assess_result.h ietf/ietf_attr_assess_result.c \
 	ietf/ietf_attr_attr_request.h ietf/ietf_attr_attr_request.c \
+	ietf/ietf_attr_fwd_enabled.h ietf/ietf_attr_fwd_enabled.c \
 	ietf/ietf_attr_installed_packages.h ietf/ietf_attr_installed_packages.c \
 	ietf/ietf_attr_pa_tnc_error.h ietf/ietf_attr_pa_tnc_error.c \
 	ietf/ietf_attr_port_filter.h ietf/ietf_attr_port_filter.c \

src/libimcv/ietf/ietf_attr.c

@@ -1,5 +1,6 @@
 /*
- * Copyright (C) 2011 Andreas Steffen, HSR Hochschule fuer Technik Rapperswil
+ * Copyright (C) 2011-2012 Andreas Steffen
+ * HSR 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
@@ -15,6 +16,7 @@
 #include "ietf_attr.h"
 #include "ietf/ietf_attr_assess_result.h"
 #include "ietf/ietf_attr_attr_request.h"
+#include "ietf/ietf_attr_fwd_enabled.h"
 #include "ietf/ietf_attr_installed_packages.h"
 #include "ietf/ietf_attr_pa_tnc_error.h"
 #include "ietf/ietf_attr_port_filter.h"
@@ -59,11 +61,12 @@ pa_tnc_attr_t* ietf_attr_create_from_data(u_int32_t type, chunk_t value)
 			return ietf_attr_pa_tnc_error_create_from_data(value);
 		case IETF_ATTR_ASSESSMENT_RESULT:
 			return ietf_attr_assess_result_create_from_data(value);
+		case IETF_ATTR_FORWARDING_ENABLED:
+			return ietf_attr_fwd_enabled_create_from_data(value);
 		case IETF_ATTR_TESTING:
 		case IETF_ATTR_NUMERIC_VERSION:
 		case IETF_ATTR_OPERATIONAL_STATUS:
 		case IETF_ATTR_REMEDIATION_INSTRUCTIONS:
-		case IETF_ATTR_FORWARDING_ENABLED:
 		case IETF_ATTR_FACTORY_DEFAULT_PWD_ENABLED:
 		case IETF_ATTR_RESERVED:
 		default:

src/libimcv/ietf/ietf_attr_fwd_enabled.c

@@ -0,0 +1,219 @@
+/*
+ * Copyright (C) 2012 Andreas Steffen
+ * HSR 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 "ietf_attr_fwd_enabled.h"
+
+#include <pa_tnc/pa_tnc_msg.h>
+#include <bio/bio_writer.h>
+#include <bio/bio_reader.h>
+#include <debug.h>
+
+typedef struct private_ietf_attr_fwd_enabled_t private_ietf_attr_fwd_enabled_t;
+
+/**
+ * PA-TNC Forwarding Enabled type  (see section 4.2.11 of RFC 5792)
+ *
+ *                       1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                        Forwarding Enabled                     |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+
+#define FORWARDING_ENABLED_SIZE		4
+
+/**
+ * Private data of an ietf_attr_fwd_enabled_t object.
+ */
+struct private_ietf_attr_fwd_enabled_t {
+
+	/**
+	 * Public members of ietf_attr_fwd_enabled_t
+	 */
+	ietf_attr_fwd_enabled_t public;
+
+	/**
+	 * Vendor-specific attribute type
+	 */
+	pen_type_t type;
+
+	/**
+	 * Attribute value
+	 */
+	chunk_t value;
+
+	/**
+	 * Noskip flag
+	 */
+	bool noskip_flag;
+
+	/**
+	 * Forwarding Enabled status
+	 */
+	os_fwd_status_t fwd_status;
+
+	/**
+	 * Reference count
+	 */
+	refcount_t ref;
+};
+
+METHOD(pa_tnc_attr_t, get_type, pen_type_t,
+	private_ietf_attr_fwd_enabled_t *this)
+{
+	return this->type;
+}
+
+METHOD(pa_tnc_attr_t, get_value, chunk_t,
+	private_ietf_attr_fwd_enabled_t *this)
+{
+	return this->value;
+}
+
+METHOD(pa_tnc_attr_t, get_noskip_flag, bool,
+	private_ietf_attr_fwd_enabled_t *this)
+{
+	return this->noskip_flag;
+}
+
+METHOD(pa_tnc_attr_t, set_noskip_flag,void,
+	private_ietf_attr_fwd_enabled_t *this, bool noskip)
+{
+	this->noskip_flag = noskip;
+}
+
+METHOD(pa_tnc_attr_t, build, void,
+	private_ietf_attr_fwd_enabled_t *this)
+{
+	bio_writer_t *writer;
+
+	if (this->value.ptr)
+	{
+		return;
+	}
+	writer = bio_writer_create(FORWARDING_ENABLED_SIZE);
+	writer->write_uint32(writer, this->fwd_status);
+
+	this->value = chunk_clone(writer->get_buf(writer));
+	writer->destroy(writer);
+}
+
+METHOD(pa_tnc_attr_t, process, status_t,
+	private_ietf_attr_fwd_enabled_t *this, u_int32_t *offset)
+{
+	bio_reader_t *reader;
+	u_int32_t fwd_status;
+
+	*offset = 0;
+
+	if (this->value.len != FORWARDING_ENABLED_SIZE)
+	{
+		DBG1(DBG_TNC, "incorrect size for IETF forwarding enabled attribute");
+		return FAILED;
+	}
+	reader = bio_reader_create(this->value);
+	reader->read_uint32(reader, &fwd_status);
+	reader->destroy(reader);
+
+	if (fwd_status > OS_FWD_UNKNOWN)
+	{
+		DBG1(DBG_TNC, "IETF forwarding enabled field has unknown value %u",
+					   fwd_status);
+		return FAILED;
+	}
+	this->fwd_status = fwd_status;
+
+	return SUCCESS;
+}
+
+METHOD(pa_tnc_attr_t, get_ref, pa_tnc_attr_t*,
+	private_ietf_attr_fwd_enabled_t *this)
+{
+	ref_get(&this->ref);
+	return &this->public.pa_tnc_attribute;
+}
+
+METHOD(pa_tnc_attr_t, destroy, void,
+	private_ietf_attr_fwd_enabled_t *this)
+{
+	if (ref_put(&this->ref))
+	{
+		free(this->value.ptr);
+		free(this);
+	}
+}
+
+METHOD(ietf_attr_fwd_enabled_t, get_status, os_fwd_status_t,
+	private_ietf_attr_fwd_enabled_t *this)
+{
+	return this->fwd_status;
+}
+
+/**
+ * Described in header.
+ */
+pa_tnc_attr_t *ietf_attr_fwd_enabled_create(os_fwd_status_t fwd_status)
+{
+	private_ietf_attr_fwd_enabled_t *this;
+
+	INIT(this,
+		.public = {
+			.pa_tnc_attribute = {
+				.get_type = _get_type,
+				.get_value = _get_value,
+				.get_noskip_flag = _get_noskip_flag,
+				.set_noskip_flag = _set_noskip_flag,
+				.build = _build,
+				.process = _process,
+				.get_ref = _get_ref,
+				.destroy = _destroy,
+			},
+			.get_status = _get_status,
+		},
+		.type = { PEN_IETF, IETF_ATTR_FORWARDING_ENABLED },
+		.fwd_status = fwd_status,
+		.ref = 1,
+	);
+
+	return &this->public.pa_tnc_attribute;
+}
+
+/**
+ * Described in header.
+ */
+pa_tnc_attr_t *ietf_attr_fwd_enabled_create_from_data(chunk_t data)
+{
+	private_ietf_attr_fwd_enabled_t *this;
+
+	INIT(this,
+		.public = {
+			.pa_tnc_attribute = {
+				.get_type = _get_type,
+				.get_value = _get_value,
+				.build = _build,
+				.process = _process,
+				.get_ref = _get_ref,
+				.destroy = _destroy,
+			},
+			.get_status = _get_status,
+		},
+		.type = { PEN_IETF, IETF_ATTR_FORWARDING_ENABLED },
+		.value = chunk_clone(data),
+		.ref = 1,
+	);
+
+	return &this->public.pa_tnc_attribute;
+}
+

src/libimcv/ietf/ietf_attr_fwd_enabled.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2012 Andreas Steffen
+ * HSR 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 ietf_attr_fwd_enabled ietf_attr_fwd_enabled
+ * @{ @ingroup ietf
+ */
+
+#ifndef IETF_ATTR_FWD_ENABLED_H_
+#define IETF_ATTR_FWD_ENABLED_H_
+
+typedef struct ietf_attr_fwd_enabled_t ietf_attr_fwd_enabled_t;
+
+#include "ietf_attr.h"
+#include "pa_tnc/pa_tnc_attr.h"
+#include "os_info/os_info.h"
+
+/**
+ * Class implementing the IETF PA-TNC Product Information attribute.
+ *
+ */
+struct ietf_attr_fwd_enabled_t {
+
+	/**
+	 * Public PA-TNC attribute interface
+	 */
+	pa_tnc_attr_t pa_tnc_attribute;
+
+	/**
+	 * Gets the Forwarding Enabled status
+	 *
+	 * @return				Forwarding Enabled status
+	 */
+	os_fwd_status_t (*get_status)(ietf_attr_fwd_enabled_t *this);
+
+};
+
+/**
+ * Creates an ietf_attr_fwd_enabled_t object
+ *
+ * @param fwd_status		Forwarding Enabled status
+ */
+pa_tnc_attr_t* ietf_attr_fwd_enabled_create(os_fwd_status_t fwd_status);
+
+/**
+ * Creates an ietf_attr_fwd_enabled_t object from received data
+ *
+ * @param value				unparsed attribute value
+ */
+pa_tnc_attr_t* ietf_attr_fwd_enabled_create_from_data(chunk_t value);
+
+#endif /** IETF_ATTR_FWD_ENABLED_H_ @}*/

src/libimcv/os_info/os_info.c

@@ -16,13 +16,18 @@
 #include "os_info.h"
 
 #include <sys/utsname.h>
+#include <stdio.h>
 
 #include <utils/linked_list.h>
 #include <debug.h>
 
-
 typedef struct private_os_info_t private_os_info_t;
 
+ENUM(os_fwd_status_names, OS_FWD_DISABLED, OS_FWD_UNKNOWN,
+	"disabled",
+	"enabled",
+	"unknown"
+);
 
 /**
  * Private data of an os_info_t object.
@@ -59,6 +64,47 @@ METHOD(os_info_t, get_version, chunk_t,
 	return this->version;
 }
 
+METHOD(os_info_t, get_fwd_status, os_fwd_status_t,
+	private_os_info_t *this)
+{
+	const char ip_forward[] = "/proc/sys/net/ipv4/ip_forward";
+	char buf[2];
+	FILE *file;
+
+	os_fwd_status_t fwd_status = OS_FWD_UNKNOWN;
+
+	file = fopen(ip_forward, "r");
+	if (file)
+	{
+		if (fread(buf, 1, 1, file) == 1)
+		{
+			switch (buf[0])
+			{
+				case '0':
+					fwd_status = OS_FWD_DISABLED;
+					break;
+				case '1':
+					fwd_status = OS_FWD_ENABLED;
+					break;
+				default:
+					DBG1(DBG_IMC, "\"%s\" returns invalid value ", ip_forward);
+					break;
+			}
+		}
+		else
+		{
+			DBG1(DBG_IMC, "could not read from \"%s\"", ip_forward);
+		}
+	}
+	else
+	{
+		DBG1(DBG_IMC, "failed to open \"%s\"", ip_forward);
+	}
+	fclose(file);
+
+	return fwd_status;
+}
+
 METHOD(os_info_t, create_package_enumerator, enumerator_t*,
 	private_os_info_t *this)
 {
@@ -298,6 +344,7 @@ os_info_t *os_info_create(void)
 		.public = {
 			.get_name = _get_name,
 			.get_version = _get_version,
+			.get_fwd_status = _get_fwd_status,
 			.create_package_enumerator = _create_package_enumerator,
 			.destroy = _destroy,
 		},

src/libimcv/os_info/os_info.h

@@ -22,9 +22,21 @@
 #define OS_INFO_H_
 
 typedef struct os_info_t os_info_t;
+typedef enum os_fwd_status_t os_fwd_status_t;
 
 #include <library.h>
 
+/**
+ * Defines the IPv4 forwarding status
+ */
+enum os_fwd_status_t {
+	OS_FWD_DISABLED =	0,
+	OS_FWD_ENABLED =	1,
+	OS_FWD_UNKNOWN =	2
+};
+
+extern enum_name_t *os_fwd_status_names;
+
 /**
  * Interface for the Operating System (OS) information module
  */
@@ -44,6 +56,13 @@ struct os_info_t {
 	 */
 	chunk_t (*get_version)(os_info_t *this);
 
+	/**
+	 * Get the OS IPv4 forwarding status
+	 *
+	 * @return					IP forwarding status
+	 */
+	os_fwd_status_t (*get_fwd_status)(os_info_t *this);
+
 	/**
 	 * Enumerates over all installed packages
 	 *

src/libimcv/plugins/imc_os/imc_os.c

@@ -20,6 +20,7 @@
 #include <ietf/ietf_attr.h>
 #include <ietf/ietf_attr_assess_result.h>
 #include <ietf/ietf_attr_attr_request.h>
+#include <ietf/ietf_attr_fwd_enabled.h>
 #include <ietf/ietf_attr_installed_packages.h>
 #include <ietf/ietf_attr_pa_tnc_error.h>
 #include <ietf/ietf_attr_product_info.h>
@@ -31,8 +32,6 @@
 #include <pen/pen.h>
 #include <debug.h>
 
-#include <stdio.h>
-
 /* IMC definitions */
 
 static const char imc_name[] = "OS";
@@ -139,6 +138,21 @@ static void add_string_version(linked_list_t *attr_list)
 	attr_list->insert_last(attr_list, attr);
 }
 
+/**
+ * Add IETF Forwarding Enabled attribute to the send queue
+ */
+static void add_fwd_enabled(linked_list_t *attr_list)
+{
+	pa_tnc_attr_t *attr;
+	os_fwd_status_t fwd_status;
+
+	fwd_status = os->get_fwd_status(os);
+	DBG1(DBG_IMC, "IPv4 forwarding status: %N",
+				   os_fwd_status_names, fwd_status);
+	attr = ietf_attr_fwd_enabled_create(fwd_status);
+	attr_list->insert_last(attr_list, attr);
+}
+
 /**
  * Add an IETF Installed Packages attribute to the send queue
  */
@@ -180,6 +194,7 @@ TNC_Result TNC_IMC_BeginHandshake(TNC_IMCID imc_id,
 		attr_list = linked_list_create();
 		add_product_info(attr_list);
 		add_string_version(attr_list);
+		add_fwd_enabled(attr_list);
 		result = imc_os->send_message(imc_os, connection_id, FALSE, 0,
 									  TNC_IMVID_ANY, attr_list);
 		attr_list->destroy(attr_list);
@@ -267,6 +282,9 @@ static TNC_Result receive_message(TNC_IMCID imc_id,
 					case IETF_ATTR_STRING_VERSION:
 						add_string_version(attr_list);
 						break;
+					case IETF_ATTR_FORWARDING_ENABLED:
+						add_fwd_enabled(attr_list);
+						break;
 					case IETF_ATTR_INSTALLED_PACKAGES:
 						add_installed_packages(attr_list);
 						break;

src/libimcv/plugins/imv_os/imv_os.c

@@ -19,10 +19,12 @@
 #include <pa_tnc/pa_tnc_msg.h>
 #include <ietf/ietf_attr.h>
 #include <ietf/ietf_attr_attr_request.h>
+#include <ietf/ietf_attr_fwd_enabled.h>
 #include <ietf/ietf_attr_installed_packages.h>
 #include <ietf/ietf_attr_pa_tnc_error.h>
 #include <ietf/ietf_attr_product_info.h>
 #include <ietf/ietf_attr_string_version.h>
+#include <os_info/os_info.h>
 
 #include <tncif_names.h>
 #include <tncif_pa_subtypes.h>
@@ -178,6 +180,17 @@ static TNC_Result receive_message(TNC_IMVID imv_id,
 				}
 				break;
 			}
+			case IETF_ATTR_FORWARDING_ENABLED:
+			{
+				ietf_attr_fwd_enabled_t *attr_cast;
+				os_fwd_status_t fwd_status;
+
+				attr_cast = (ietf_attr_fwd_enabled_t*)attr;
+				fwd_status = attr_cast->get_status(attr_cast);
+				DBG1(DBG_IMV, "IPv4 forwarding status: %N",
+							   os_fwd_status_names, fwd_status);
+				break;
+			}
 			case IETF_ATTR_INSTALLED_PACKAGES:
 			{ 
 				ietf_attr_installed_packages_t *attr_cast;
@@ -339,6 +352,7 @@ TNC_Result TNC_IMV_BatchEnding(TNC_IMVID imv_id,
 											 IETF_ATTR_PRODUCT_INFORMATION);
 		attr_cast = (ietf_attr_attr_request_t*)attr;
 		attr_cast->add(attr_cast, PEN_IETF, IETF_ATTR_STRING_VERSION);
+		attr_cast->add(attr_cast, PEN_IETF, IETF_ATTR_FORWARDING_ENABLED);
 		attr_list->insert_last(attr_list, attr);
 		result = imv_os->send_message(imv_os, connection_id, FALSE, imv_id,
 									  TNC_IMCID_ANY, attr_list);