Implemented HCD IMC and IMV

11 files changed, 1949 insertions, 0 deletions

diff --git a/src/libimcv/Makefile.am b/src/libimcv/Makefile.am
index 593611dd8..6923aac0d 100644
--- a/src/libimcv/Makefile.am
+++ b/src/libimcv/Makefile.am
@@ -175,6 +175,14 @@ if USE_IMV_SWID
   SUBDIRS += plugins/imv_swid
 endif
 
+if USE_IMC_HCD
+  SUBDIRS += plugins/imc_hcd
+endif
+
+if USE_IMV_HCD
+  SUBDIRS += plugins/imv_hcd
+endif
+
 TESTS = imcv_tests
 
 check_PROGRAMS = $(TESTS)
diff --git a/src/libimcv/plugins/imc_hcd/Makefile.am b/src/libimcv/plugins/imc_hcd/Makefile.am
new file mode 100644
index 000000000..db25a57de
--- /dev/null
+++ b/src/libimcv/plugins/imc_hcd/Makefile.am
@@ -0,0 +1,16 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/libstrongswan \
+	-I$(top_srcdir)/src/libtncif \
+	-I$(top_srcdir)/src/libimcv
+
+AM_CFLAGS = \
+	$(PLUGIN_CFLAGS)
+
+imcv_LTLIBRARIES = imc-hcd.la
+
+imc_hcd_la_LIBADD = $(top_builddir)/src/libimcv/libimcv.la \
+	$(top_builddir)/src/libstrongswan/libstrongswan.la
+
+imc_hcd_la_SOURCES = imc_hcd.c imc_hcd_state.h imc_hcd_state.c
+
+imc_hcd_la_LDFLAGS = -module -avoid-version -no-undefined
diff --git a/src/libimcv/plugins/imc_hcd/imc_hcd.c b/src/libimcv/plugins/imc_hcd/imc_hcd.c
new file mode 100644
index 000000000..35badebbe
--- /dev/null
+++ b/src/libimcv/plugins/imc_hcd/imc_hcd.c
@@ -0,0 +1,714 @@
+/*
+ * Copyright (C) 2015 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 "imc_hcd_state.h"
+
+#include <imc/imc_agent.h>
+#include <imc/imc_msg.h>
+#include <generic/generic_attr_bool.h>
+#include <generic/generic_attr_chunk.h>
+#include <generic/generic_attr_string.h>
+#include <ietf/ietf_attr.h>
+#include <ietf/ietf_attr_attr_request.h>
+#include <pwg/pwg_attr.h>
+#include <pwg/pwg_attr_vendor_smi_code.h>
+
+#include <tncif_pa_subtypes.h>
+
+#include <pen/pen.h>
+#include <utils/debug.h>
+
+/* IMC definitions */
+
+static const char imc_name[] = "HCD";
+
+static pen_type_t msg_types[] = {
+	{ PEN_PWG, PA_SUBTYPE_PWG_HCD }
+};
+
+static imc_agent_t *imc_hcd;
+
+typedef struct quadruple_t quadruple_t;
+
+struct quadruple_t {
+	char *section;
+	pwg_attr_t name_attr;
+	pwg_attr_t patches_attr;
+	pwg_attr_t string_version_attr;
+	pwg_attr_t version_attr;
+};
+
+static quadruple_t quadruples[] = {
+	{ "firmware",
+	   PWG_HCD_FIRMWARE_NAME, PWG_HCD_FIRMWARE_PATCHES,
+	   PWG_HCD_FIRMWARE_STRING_VERSION, PWG_HCD_FIRMWARE_VERSION },
+	{ "resident_application",
+	   PWG_HCD_RESIDENT_APP_NAME, PWG_HCD_RESIDENT_APP_PATCHES,
+	   PWG_HCD_RESIDENT_APP_STRING_VERSION, PWG_HCD_RESIDENT_APP_VERSION },
+	{ "user_application",
+	   PWG_HCD_USER_APP_NAME, PWG_HCD_USER_APP_PATCHES,
+	   PWG_HCD_USER_APP_STRING_VERSION, PWG_HCD_USER_APP_VERSION }
+};
+
+/**
+ * see section 3.8.1 of TCG TNC IF-IMC Specification 1.3
+ */
+TNC_Result TNC_IMC_API TNC_IMC_Initialize(TNC_IMCID imc_id,
+										  TNC_Version min_version,
+										  TNC_Version max_version,
+										  TNC_Version *actual_version)
+{
+	if (imc_hcd)
+	{
+		DBG1(DBG_IMC, "IMC \"%s\" has already been initialized", imc_name);
+		return TNC_RESULT_ALREADY_INITIALIZED;
+	}
+	imc_hcd = imc_agent_create(imc_name, msg_types, countof(msg_types),
+							  imc_id, actual_version);
+	if (!imc_hcd)
+	{
+		return TNC_RESULT_FATAL;
+	}
+
+	if (min_version > TNC_IFIMC_VERSION_1 || max_version < TNC_IFIMC_VERSION_1)
+	{
+		DBG1(DBG_IMC, "no common IF-IMC version");
+		return TNC_RESULT_NO_COMMON_VERSION;
+	}
+	return TNC_RESULT_SUCCESS;
+}
+
+/**
+ * see section 3.8.2 of TCG TNC IF-IMC Specification 1.3
+ */
+TNC_Result TNC_IMC_API TNC_IMC_NotifyConnectionChange(TNC_IMCID imc_id,
+				TNC_ConnectionID connection_id, TNC_ConnectionState new_state)
+{
+	imc_state_t *state;
+
+	if (!imc_hcd)
+	{
+		DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	switch (new_state)
+	{
+		case TNC_CONNECTION_STATE_CREATE:
+			state = imc_hcd_state_create(connection_id);
+			return imc_hcd->create_state(imc_hcd, state);
+		case TNC_CONNECTION_STATE_HANDSHAKE:
+			if (imc_hcd->change_state(imc_hcd, connection_id, new_state,
+				&state) != TNC_RESULT_SUCCESS)
+			{
+				return TNC_RESULT_FATAL;
+			}
+			state->set_result(state, imc_id,
+							  TNC_IMV_EVALUATION_RESULT_DONT_KNOW);
+			return TNC_RESULT_SUCCESS;
+		case TNC_CONNECTION_STATE_DELETE:
+			return imc_hcd->delete_state(imc_hcd, connection_id);
+		default:
+			return imc_hcd->change_state(imc_hcd, connection_id,
+											 new_state, NULL);
+	}
+}
+
+/**
+ * Add AttributesNaturalLanguage attribute to send queue
+ */
+static void add_attrs_natural_lang(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	char *string;
+
+	string = lib->settings->get_str(lib->settings,
+					"%s.plugins.imc-hcd.attributes_natural_language", "en",
+					lib->ns);
+	DBG2(DBG_IMC, "%N: %s", pwg_attr_names, PWG_HCD_ATTRS_NATURAL_LANG,
+					string);
+	attr = generic_attr_string_create(chunk_from_str(string),
+					pen_type_create(PEN_PWG, PWG_HCD_ATTRS_NATURAL_LANG));
+	msg->add_attribute(msg, attr);
+}
+
+/**
+ * Add DefaultPasswordEnabled attribute to send queue
+ */
+static void add_default_pwd_enabled(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	bool status;
+
+	status = lib->settings->get_bool(lib->settings,
+					"%s.plugins.imc-hcd.default_password_enabled", FALSE,
+					lib->ns);
+	DBG2(DBG_IMC, "%N: %s", pwg_attr_names, PWG_HCD_DEFAULT_PWD_ENABLED,
+					status ? "yes" : "no");
+	attr = generic_attr_bool_create(status,
+					pen_type_create(PEN_PWG, PWG_HCD_DEFAULT_PWD_ENABLED));
+	msg->add_attribute(msg, attr);
+}
+
+/**
+ * Add ForwardingEnabled attribute to send queue
+ */
+static void add_forwarding_enabled(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	bool status;
+
+	status = lib->settings->get_bool(lib->settings,
+					"%s.plugins.imc-hcd.forwarding_enabled", FALSE, lib->ns);
+	DBG2(DBG_IMC, "%N: %s", pwg_attr_names, PWG_HCD_FORWARDING_ENABLED,
+					status ? "yes" : "no");
+	attr = generic_attr_bool_create(status,
+					pen_type_create(PEN_PWG, PWG_HCD_FORWARDING_ENABLED));
+	msg->add_attribute(msg, attr);
+}
+
+/**
+ * Add MachineTypeModel attribute to send queue
+ */
+static void add_machine_type_model(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	char *string;
+
+	string = lib->settings->get_str(lib->settings,
+					"%s.plugins.imc-hcd.machine_type_model", "", lib->ns);
+	DBG2(DBG_IMC, "%N: %s", pwg_attr_names, PWG_HCD_MACHINE_TYPE_MODEL,
+					string);
+	attr = generic_attr_string_create(chunk_from_str(string),
+					pen_type_create(PEN_PWG, PWG_HCD_MACHINE_TYPE_MODEL));
+	msg->add_attribute(msg, attr);
+}
+
+/**
+ * Add PSTNFaxEnabled attribute to send queue
+ */
+static void add_pstn_fax_enabled(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	bool status;
+
+	status = lib->settings->get_bool(lib->settings,
+					"%s.plugins.imc-hcd.pstn_fax_enabled", FALSE, lib->ns);
+	DBG2(DBG_IMC, "%N: %s", pwg_attr_names, PWG_HCD_PSTN_FAX_ENABLED,
+					status ? "yes" : "no");
+	attr = generic_attr_bool_create(status,
+					pen_type_create(PEN_PWG, PWG_HCD_PSTN_FAX_ENABLED));
+	msg->add_attribute(msg, attr);
+}
+
+/**
+ * Add TimeSource attribute to send queue
+ */
+static void add_time_source(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	char *string;
+
+	string = lib->settings->get_str(lib->settings,
+					"%s.plugins.imc-hcd.time_source", "", lib->ns);
+	DBG2(DBG_IMC, "%N: %s", pwg_attr_names, PWG_HCD_TIME_SOURCE,
+					string);
+	attr = generic_attr_string_create(chunk_from_str(string),
+					pen_type_create(PEN_PWG, PWG_HCD_TIME_SOURCE));
+	msg->add_attribute(msg, attr);
+}
+
+/**
+ * Add UserApplicationEnabled attribute to send queue
+ */
+static void add_user_app_enabled(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	bool status;
+
+	status = lib->settings->get_bool(lib->settings,
+					"%s.plugins.imc-hcd.user_application_enabled", FALSE,
+					lib->ns);
+	DBG2(DBG_IMC, "%N: %s", pwg_attr_names, PWG_HCD_USER_APP_ENABLED,
+					status ? "yes" : "no");
+	attr = generic_attr_bool_create(status,
+					pen_type_create(PEN_PWG, PWG_HCD_USER_APP_ENABLED));
+	msg->add_attribute(msg, attr);
+}
+
+/**
+ * Add UserApplicationPersistenceEnabled attribute to send queue
+ */
+static void add_user_app_persist_enabled(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	bool status;
+
+	status = lib->settings->get_bool(lib->settings,
+					"%s.plugins.imc-hcd.user_application_persistenc.enabled",
+					FALSE, lib->ns);
+	DBG2(DBG_IMC, "%N: %s", pwg_attr_names, PWG_HCD_USER_APP_PERSIST_ENABLED,
+					status ? "yes" : "no");
+	attr = generic_attr_bool_create(status,
+					pen_type_create(PEN_PWG, PWG_HCD_USER_APP_PERSIST_ENABLED));
+	msg->add_attribute(msg, attr);
+}
+
+/**
+ * Add VendorName attribute to send queue
+ */
+static void add_vendor_name(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	char *string;
+
+	string = lib->settings->get_str(lib->settings,
+					"%s.plugins.imc-hcd.vendor_name", "", lib->ns);
+	DBG2(DBG_IMC, "%N: %s", pwg_attr_names, PWG_HCD_VENDOR_NAME,
+					string);
+	attr = generic_attr_string_create(chunk_from_str(string),
+					pen_type_create(PEN_PWG, PWG_HCD_VENDOR_NAME));
+	msg->add_attribute(msg, attr);
+}
+
+/**
+ * Add VendorSMICode attribute to send queue
+ */
+static void add_vendor_smi_code(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	int smi_code;
+
+	smi_code = lib->settings->get_int(lib->settings,
+					"%s.plugins.imc-hcd.vendor_smi_code", 0, lib->ns);
+	DBG2(DBG_IMC, "%N: 0x%06x (%d)", pwg_attr_names, PWG_HCD_VENDOR_SMI_CODE,
+					smi_code, smi_code);
+	attr = pwg_attr_vendor_smi_code_create(smi_code);
+	msg->add_attribute(msg, attr);
+}
+
+/**
+ * Add CertificationState attribute to send queue
+ */
+static void add_certification_state(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	char *hex_string;
+	chunk_t blob;
+
+	hex_string = lib->settings->get_str(lib->settings,
+					"%s.plugins.imc-hcd.certification_state", NULL, lib->ns);
+	if (hex_string)
+	{
+		blob = chunk_from_hex(chunk_from_str(hex_string), NULL);
+	
+		DBG2(DBG_IMC, "%N: %B", pwg_attr_names, PWG_HCD_CERTIFICATION_STATE,
+					&blob);
+		attr = generic_attr_chunk_create(blob,
+					pen_type_create(PEN_PWG, PWG_HCD_CERTIFICATION_STATE));
+		msg->add_attribute(msg, attr);
+		chunk_free(&blob);
+	}
+}
+
+/**
+ * Add CertificationState attribute to send queue
+ */
+static void add_configuration_state(imc_msg_t *msg)
+{
+	pa_tnc_attr_t *attr;
+	char *hex_string;
+	chunk_t blob;
+
+	hex_string = lib->settings->get_str(lib->settings,
+					"%s.plugins.imc-hcd.configuration_state", NULL, lib->ns);
+	if (hex_string)
+	{
+		blob = chunk_from_hex(chunk_from_str(hex_string), NULL);
+	
+		DBG2(DBG_IMC, "%N: %B", pwg_attr_names, PWG_HCD_CONFIGURATION_STATE,
+					&blob);
+		attr = generic_attr_chunk_create(blob,
+					pen_type_create(PEN_PWG, PWG_HCD_CONFIGURATION_STATE));
+		msg->add_attribute(msg, attr);
+		chunk_free(&blob);
+	}
+}
+
+/**
+ * Add Correlated Attributes to send queue
+ */
+static void add_quadruple(imc_msg_t *msg, quadruple_t *quad)
+{
+	pa_tnc_attr_t *attr;
+	const size_t version_len = 16;
+	char version[version_len];
+	char hex_version_default[] = "00000000000000000000000000000000";
+	char *app, *name, *patches, *pos, *string_version, *hex_version;
+	chunk_t num_version;
+	enumerator_t *enumerator;
+
+	enumerator = lib->settings->create_section_enumerator(lib->settings,
+						"%s.plugins.imc-hcd.%s", lib->ns, quad->section);
+	while (enumerator->enumerate(enumerator, &app))
+	{
+		name = lib->settings->get_str(lib->settings,
+						"%s.plugins.imc-hcd.%s.%s.name", "",
+						lib->ns, quad->section, app);
+		patches = lib->settings->get_str(lib->settings,
+						"%s.plugins.imc-hcd.%s.%s.patches", "",
+						lib->ns, quad->section, app);
+		string_version = lib->settings->get_str(lib->settings,
+						"%s.plugins.imc-hcd.%s.%s.string_version", "",
+						lib->ns, quad->section, app);
+		hex_version = lib->settings->get_str(lib->settings,
+						"%s.plugins.imc-hcd.%s.%s.version", hex_version_default,
+						lib->ns, quad->section, app);
+
+		/* replace \n escape character by CRLF */
+		pos = patches;
+		while (TRUE)
+		{
+			pos = strchr(pos, '\\');
+			if (pos == NULL)
+			{
+				break;
+			}
+			if (pos[1] == 'n')
+			{
+				pos[0] = '\r';
+				pos[1] = '\n';
+				pos++;
+			}
+			pos++;
+		}
+
+		/* convert hex string into binary chunk */
+		if (strlen(hex_version) > 2 * version_len)
+		{
+			hex_version = hex_version_default;
+		}
+		num_version = chunk_from_hex(chunk_from_str(hex_version), version);
+
+		DBG2(DBG_IMC, "--- %s ---", app);
+
+		DBG2(DBG_IMC, "%N: %s", pwg_attr_names, quad->name_attr, name);
+		attr = generic_attr_string_create(chunk_from_str(name),
+						pen_type_create(PEN_PWG, quad->name_attr));
+		msg->add_attribute(msg, attr);
+
+		DBG2(DBG_IMC, "%N: %s", pwg_attr_names, quad->patches_attr, patches);
+		attr = generic_attr_string_create(chunk_from_str(patches),
+						pen_type_create(PEN_PWG, quad->patches_attr));
+		msg->add_attribute(msg, attr);
+
+		DBG2(DBG_IMC, "%N: %s", pwg_attr_names, quad->string_version_attr,
+						string_version);
+		attr = generic_attr_string_create(chunk_from_str(string_version),
+						pen_type_create(PEN_PWG, quad->string_version_attr));
+		msg->add_attribute(msg, attr);
+
+		DBG2(DBG_IMC, "%N: %#B", pwg_attr_names, quad->version_attr, &num_version);
+		attr = generic_attr_chunk_create(num_version,
+						pen_type_create(PEN_PWG, quad->version_attr));
+		msg->add_attribute(msg, attr);
+	}
+	enumerator->destroy(enumerator);
+}
+
+/**
+ * see section 3.8.3 of TCG TNC IF-IMC Specification 1.3
+ */
+TNC_Result TNC_IMC_API TNC_IMC_BeginHandshake(TNC_IMCID imc_id,
+											  TNC_ConnectionID connection_id)
+{
+	imc_state_t *state;
+	imc_msg_t *out_msg;
+	TNC_Result result = TNC_RESULT_SUCCESS;
+	int i;
+
+	if (!imc_hcd)
+	{
+		DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	if (!imc_hcd->get_state(imc_hcd, connection_id, &state))
+	{
+		return TNC_RESULT_FATAL;
+	}
+	out_msg = imc_msg_create(imc_hcd, state, connection_id, imc_id,
+							 TNC_IMVID_ANY, msg_types[0]);
+
+	/* mandatory attributes that are always sent without request */
+	add_attrs_natural_lang(out_msg);
+	add_default_pwd_enabled(out_msg);
+	add_forwarding_enabled(out_msg);
+	add_machine_type_model(out_msg);
+	add_pstn_fax_enabled(out_msg);
+	add_time_source(out_msg);
+	add_vendor_name(out_msg);
+	add_vendor_smi_code(out_msg);
+	add_user_app_enabled(out_msg);
+	add_user_app_persist_enabled(out_msg);
+
+	if (lib->settings->get_bool(lib->settings,
+								"%s.plugins.imc-hcd.push_info", FALSE, lib->ns))
+	{
+		/* correlated attributes */
+		for (i = 0; i < countof(quadruples); i++)
+		{
+			add_quadruple(out_msg, &quadruples[i]);
+		}
+	}
+
+	/* send PA-TNC message with the excl flag not set */
+	result = out_msg->send(out_msg, FALSE);
+	out_msg->destroy(out_msg);
+
+	return result;
+}
+
+static TNC_Result receive_message(imc_state_t *state, imc_msg_t *in_msg)
+{
+	imc_msg_t *out_msg;
+	enumerator_t *enumerator;
+	pa_tnc_attr_t *attr;
+	pen_type_t type;
+	TNC_Result result;
+	bool fatal_error = FALSE, pushed_info;
+
+	/* generate an outgoing PA-TNC message - we might need it */
+	out_msg = imc_msg_create_as_reply(in_msg);
+
+	/* parse received PA-TNC message and handle local and remote errors */
+	result = in_msg->receive(in_msg, out_msg, &fatal_error);
+	if (result != TNC_RESULT_SUCCESS)
+	{
+		out_msg->destroy(out_msg);
+		return result;
+	}
+	pushed_info = lib->settings->get_bool(lib->settings,
+						"%s.plugins.imc-hcd.push_info", FALSE, lib->ns);
+
+	/* analyze PA-TNC attributes */
+	enumerator = in_msg->create_attribute_enumerator(in_msg);
+	while (enumerator->enumerate(enumerator, &attr))
+	{
+		type = attr->get_type(attr);
+
+		if (type.vendor_id == PEN_IETF)
+		{
+			if (type.type == IETF_ATTR_ATTRIBUTE_REQUEST)
+			{
+				ietf_attr_attr_request_t *attr_cast;
+				pen_type_t *entry;
+				enumerator_t *e;
+
+				attr_cast = (ietf_attr_attr_request_t*)attr;
+
+				e = attr_cast->create_enumerator(attr_cast);
+				while (e->enumerate(e, &entry))
+				{
+					if (entry->vendor_id == PEN_PWG)
+					{
+						switch (entry->type)
+						{
+							case PWG_HCD_ATTRS_NATURAL_LANG:
+								add_attrs_natural_lang(out_msg);
+								break;
+							case PWG_HCD_DEFAULT_PWD_ENABLED:
+								add_default_pwd_enabled(out_msg);
+								break;
+							case PWG_HCD_FORWARDING_ENABLED:
+								add_forwarding_enabled(out_msg);
+								break;
+							case PWG_HCD_MACHINE_TYPE_MODEL:
+								add_machine_type_model(out_msg);
+								break;
+							case PWG_HCD_PSTN_FAX_ENABLED:
+								add_pstn_fax_enabled(out_msg);
+								break;
+							case PWG_HCD_TIME_SOURCE:
+								add_time_source(out_msg);
+								break;
+							case PWG_HCD_USER_APP_ENABLED:
+								add_user_app_enabled(out_msg);
+								break;
+							case PWG_HCD_USER_APP_PERSIST_ENABLED:
+								add_user_app_persist_enabled(out_msg);
+								break;
+							case PWG_HCD_VENDOR_NAME:
+								add_vendor_name(out_msg);
+								break;
+							case PWG_HCD_VENDOR_SMI_CODE:
+								add_vendor_smi_code(out_msg);
+								break;
+							case PWG_HCD_CERTIFICATION_STATE:
+								add_certification_state(out_msg);
+								break;
+							case PWG_HCD_CONFIGURATION_STATE:
+								add_configuration_state(out_msg);
+								break;
+							default:
+								if (pushed_info)
+								{
+									continue;
+								}
+						}
+
+						/* if not pushed, deliver on request */
+						switch (entry->type)
+						{
+							case PWG_HCD_FIRMWARE_NAME:
+								add_quadruple(out_msg, &quadruples[0]);
+								break;
+							case PWG_HCD_RESIDENT_APP_NAME:
+								add_quadruple(out_msg, &quadruples[1]);
+								break;
+							case PWG_HCD_USER_APP_NAME:
+								add_quadruple(out_msg, &quadruples[2]);
+								break;
+							default:
+								break;
+						}
+					}
+				}
+				e->destroy(e);
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	if (fatal_error)
+	{
+		result = TNC_RESULT_FATAL;
+	}
+	else
+	{
+		/* send PA-TNC message with the EXCL flag set */
+		result = out_msg->send(out_msg, TRUE);
+	}
+	out_msg->destroy(out_msg);
+
+	return result;
+}
+
+/**
+ * see section 3.8.4 of TCG TNC IF-IMC Specification 1.3
+ */
+TNC_Result TNC_IMC_API TNC_IMC_ReceiveMessage(TNC_IMCID imc_id,
+											  TNC_ConnectionID connection_id,
+											  TNC_BufferReference msg,
+											  TNC_UInt32 msg_len,
+											  TNC_MessageType msg_type)
+{
+	imc_state_t *state;
+	imc_msg_t *in_msg;
+	TNC_Result result;
+
+	if (!imc_hcd)
+	{
+		DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	if (!imc_hcd->get_state(imc_hcd, connection_id, &state))
+	{
+		return TNC_RESULT_FATAL;
+	}
+	in_msg = imc_msg_create_from_data(imc_hcd, state, connection_id, msg_type,
+									  chunk_create(msg, msg_len));
+	result = receive_message(state, in_msg);
+	in_msg->destroy(in_msg);
+
+	return result;
+}
+
+/**
+ * see section 3.8.6 of TCG TNC IF-IMV Specification 1.3
+ */
+TNC_Result TNC_IMC_API TNC_IMC_ReceiveMessageLong(TNC_IMCID imc_id,
+												  TNC_ConnectionID connection_id,
+												  TNC_UInt32 msg_flags,
+												  TNC_BufferReference msg,
+												  TNC_UInt32 msg_len,
+												  TNC_VendorID msg_vid,
+												  TNC_MessageSubtype msg_subtype,
+												  TNC_UInt32 src_imv_id,
+												  TNC_UInt32 dst_imc_id)
+{
+	imc_state_t *state;
+	imc_msg_t *in_msg;
+	TNC_Result result;
+
+	if (!imc_hcd)
+	{
+		DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	if (!imc_hcd->get_state(imc_hcd, connection_id, &state))
+	{
+		return TNC_RESULT_FATAL;
+	}
+	in_msg = imc_msg_create_from_long_data(imc_hcd, state, connection_id,
+								src_imv_id, dst_imc_id,msg_vid, msg_subtype,
+								chunk_create(msg, msg_len));
+	result =receive_message(state, in_msg);
+	in_msg->destroy(in_msg);
+
+	return result;
+}
+
+/**
+ * see section 3.8.7 of TCG TNC IF-IMC Specification 1.3
+ */
+TNC_Result TNC_IMC_API TNC_IMC_BatchEnding(TNC_IMCID imc_id,
+										   TNC_ConnectionID connection_id)
+{
+	if (!imc_hcd)
+	{
+		DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	return TNC_RESULT_SUCCESS;
+}
+
+/**
+ * see section 3.8.8 of TCG TNC IF-IMC Specification 1.3
+ */
+TNC_Result TNC_IMC_API TNC_IMC_Terminate(TNC_IMCID imc_id)
+{
+	if (!imc_hcd)
+	{
+		DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	imc_hcd->destroy(imc_hcd);
+	imc_hcd = NULL;
+
+	return TNC_RESULT_SUCCESS;
+}
+
+/**
+ * see section 4.2.8.1 of TCG TNC IF-IMC Specification 1.3
+ */
+TNC_Result TNC_IMC_API TNC_IMC_ProvideBindFunction(TNC_IMCID imc_id,
+									TNC_TNCC_BindFunctionPointer bind_function)
+{
+	if (!imc_hcd)
+	{
+		DBG1(DBG_IMC, "IMC \"%s\" has not been initialized", imc_name);
+		return TNC_RESULT_NOT_INITIALIZED;
+	}
+	return imc_hcd->bind_functions(imc_hcd, bind_function);
+}
diff --git a/src/libimcv/plugins/imc_hcd/imc_hcd_state.c b/src/libimcv/plugins/imc_hcd/imc_hcd_state.c
new file mode 100644
index 000000000..ce93d7ef7
--- /dev/null
+++ b/src/libimcv/plugins/imc_hcd/imc_hcd_state.c
@@ -0,0 +1,176 @@
+/*
+ * Copyright (C) 2015 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 "imc_hcd_state.h"
+
+#include <tncif_names.h>
+
+#include <utils/debug.h>
+
+typedef struct private_imc_hcd_state_t private_imc_hcd_state_t;
+
+/**
+ * Private data of an imc_hcd_state_t object.
+ */
+struct private_imc_hcd_state_t {
+
+	/**
+	 * Public members of imc_hcd_state_t
+	 */
+	imc_hcd_state_t public;
+
+	/**
+	 * TNCCS connection ID
+	 */
+	TNC_ConnectionID connection_id;
+
+	/**
+	 * TNCCS connection state
+	 */
+	TNC_ConnectionState state;
+
+	/**
+	 * Assessment/Evaluation Result
+	 */
+	TNC_IMV_Evaluation_Result result;
+
+	/**
+	 * Does the TNCCS connection support long message types?
+	 */
+	bool has_long;
+
+	/**
+	 * Does the TNCCS connection support exclusive delivery?
+	 */
+	bool has_excl;
+
+	/**
+	 * Maximum PA-TNC message size for this TNCCS connection
+	 */
+	u_int32_t max_msg_len;
+
+	/**
+	 * PA-TNC attribute segmentation contracts associated with TNCCS connection
+	 */
+	seg_contract_manager_t *contracts;
+};
+
+METHOD(imc_state_t, get_connection_id, TNC_ConnectionID,
+	private_imc_hcd_state_t *this)
+{
+	return this->connection_id;
+}
+
+METHOD(imc_state_t, has_long, bool,
+	private_imc_hcd_state_t *this)
+{
+	return this->has_long;
+}
+
+METHOD(imc_state_t, has_excl, bool,
+	private_imc_hcd_state_t *this)
+{
+	return this->has_excl;
+}
+
+METHOD(imc_state_t, set_flags, void,
+	private_imc_hcd_state_t *this, bool has_long, bool has_excl)
+{
+	this->has_long = has_long;
+	this->has_excl = has_excl;
+}
+
+METHOD(imc_state_t, set_max_msg_len, void,
+	private_imc_hcd_state_t *this, u_int32_t max_msg_len)
+{
+	this->max_msg_len = max_msg_len;
+}
+
+METHOD(imc_state_t, get_max_msg_len, u_int32_t,
+	private_imc_hcd_state_t *this)
+{
+	return this->max_msg_len;
+}
+
+METHOD(imc_state_t, get_contracts, seg_contract_manager_t*,
+	private_imc_hcd_state_t *this)
+{
+	return this->contracts;
+}
+
+METHOD(imc_state_t, change_state, void,
+	private_imc_hcd_state_t *this, TNC_ConnectionState new_state)
+{
+	this->state = new_state;
+}
+
+METHOD(imc_state_t, set_result, void,
+	private_imc_hcd_state_t *this, TNC_IMCID id,
+	TNC_IMV_Evaluation_Result result)
+{
+	this->result = result;
+}
+
+METHOD(imc_state_t, get_result, bool,
+	private_imc_hcd_state_t *this, TNC_IMCID id,
+	TNC_IMV_Evaluation_Result *result)
+{
+	if (result)
+	{
+		*result = this->result;
+	}
+	return this->result != TNC_IMV_EVALUATION_RESULT_DONT_KNOW;
+}
+
+METHOD(imc_state_t, destroy, void,
+	private_imc_hcd_state_t *this)
+{
+	this->contracts->destroy(this->contracts);
+	free(this);
+}
+
+/**
+ * Described in header.
+ */
+imc_state_t *imc_hcd_state_create(TNC_ConnectionID connection_id)
+{
+	private_imc_hcd_state_t *this;
+
+	INIT(this,
+		.public = {
+			.interface = {
+				.get_connection_id = _get_connection_id,
+				.has_long = _has_long,
+				.has_excl = _has_excl,
+				.set_flags = _set_flags,
+				.set_max_msg_len = _set_max_msg_len,
+				.get_max_msg_len = _get_max_msg_len,
+				.get_contracts = _get_contracts,
+				.change_state = _change_state,
+				.set_result = _set_result,
+				.get_result = _get_result,
+				.destroy = _destroy,
+			},
+		},
+		.state = TNC_CONNECTION_STATE_CREATE,
+		.result = TNC_IMV_EVALUATION_RESULT_DONT_KNOW,
+		.connection_id = connection_id,
+		.contracts = seg_contract_manager_create(),
+	);
+
+	return &this->public.interface;
+}
+
+
diff --git a/src/libimcv/plugins/imc_hcd/imc_hcd_state.h b/src/libimcv/plugins/imc_hcd/imc_hcd_state.h
new file mode 100644
index 000000000..dbd5ddb4f
--- /dev/null
+++ b/src/libimcv/plugins/imc_hcd/imc_hcd_state.h
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2015 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 imc_hcd imc_hcd
+ * @ingroup libimcv_plugins
+ *
+ * @defgroup imc_hcd_state_t imc_hcd_state
+ * @{ @ingroup imc_hcd
+ */
+
+#ifndef IMC_HCD_STATE_H_
+#define IMC_HCD_STATE_H_
+
+#include <imc/imc_state.h>
+#include <library.h>
+
+typedef struct imc_hcd_state_t imc_hcd_state_t;
+
+/**
+ * Internal state of an imc_hcd_t connection instance
+ */
+struct imc_hcd_state_t {
+
+	/**
+	 * imc_state_t interface
+	 */
+	imc_state_t interface;
+};
+
+/**
+ * Create an imc_hcd_state_t instance
+ *
+ * @param id		connection ID
+ */
+imc_state_t* imc_hcd_state_create(TNC_ConnectionID id);
+
+#endif /** IMC_HCD_STATE_H_ @}*/
diff --git a/src/libimcv/plugins/imv_hcd/Makefile.am b/src/libimcv/plugins/imv_hcd/Makefile.am
new file mode 100644
index 000000000..28926d45e
--- /dev/null
+++ b/src/libimcv/plugins/imv_hcd/Makefile.am
@@ -0,0 +1,18 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/libstrongswan \
+	-I$(top_srcdir)/src/libtncif \
+	-I$(top_srcdir)/src/libimcv
+
+AM_CFLAGS = \
+	$(PLUGIN_CFLAGS)
+
+imcv_LTLIBRARIES = imv-hcd.la
+
+imv_hcd_la_LIBADD = $(top_builddir)/src/libimcv/libimcv.la \
+	$(top_builddir)/src/libstrongswan/libstrongswan.la
+
+imv_hcd_la_SOURCES = \
+	imv_hcd.c imv_hcd_state.h imv_hcd_state.c \
+	imv_hcd_agent.h imv_hcd_agent.c
+
+imv_hcd_la_LDFLAGS = -module -avoid-version -no-undefined
diff --git a/src/libimcv/plugins/imv_hcd/imv_hcd.c b/src/libimcv/plugins/imv_hcd/imv_hcd.c
new file mode 100644
index 000000000..f32095217
--- /dev/null
+++ b/src/libimcv/plugins/imv_hcd/imv_hcd.c
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2015 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 "imv_hcd_agent.h"
+
+static const char imv_name[] = "HCD";
+static const imv_agent_create_t imv_agent_create = imv_hcd_agent_create;
+
+/* include generic TGC TNC IF-IMV API code below */
+
+#include <imv/imv_if.h>
+
diff --git a/src/libimcv/plugins/imv_hcd/imv_hcd_agent.c b/src/libimcv/plugins/imv_hcd/imv_hcd_agent.c
new file mode 100644
index 000000000..7143f2414
--- /dev/null
+++ b/src/libimcv/plugins/imv_hcd/imv_hcd_agent.c
@@ -0,0 +1,566 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+
+#include "imv_hcd_agent.h"
+#include "imv_hcd_state.h"
+
+#include <imcv.h>
+#include <imv/imv_agent.h>
+#include <imv/imv_msg.h>
+#include <generic/generic_attr_bool.h>
+#include <generic/generic_attr_chunk.h>
+#include <generic/generic_attr_string.h>
+#include <ietf/ietf_attr.h>
+#include <ietf/ietf_attr_attr_request.h>
+#include <pwg/pwg_attr.h>
+#include <pwg/pwg_attr_vendor_smi_code.h>
+#include "tcg/seg/tcg_seg_attr_max_size.h"
+#include "tcg/seg/tcg_seg_attr_seg_env.h"
+
+#include <tncif_names.h>
+#include <tncif_pa_subtypes.h>
+
+#include <pen/pen.h>
+#include <utils/debug.h>
+
+#define HCD_MAX_ATTR_SIZE	10000000
+
+typedef struct private_imv_hcd_agent_t private_imv_hcd_agent_t;
+typedef enum imv_hcd_attr_t imv_hcd_attr_t;
+
+/* Subscribed PA-TNC message subtypes */
+static pen_type_t msg_types[] = {
+	{ PEN_PWG, PA_SUBTYPE_PWG_HCD }
+};
+
+/**
+ * Flag set when corresponding attribute has been received
+ */
+enum imv_hcd_attr_t {
+	IMV_HCD_ATTR_NONE =                          0,
+	IMV_HCD_ATTR_NATURAL_LANG =              (1<<0),
+	IMV_HCD_ATTR_DEFAULT_PWD_ENABLED =       (1<<1),
+	IMV_HCD_ATTR_FIREWALL_SETTING =          (1<<2),
+	IMV_HCD_ATTR_FIRMWARE_NAME =             (1<<3),
+	IMV_HCD_ATTR_FORWARDING_ENABLED =        (1<<4),
+	IMV_HCD_ATTR_MACHINE_TYPE_MODEL =        (1<<5),
+	IMV_HCD_ATTR_PSTN_FAX_ENABLED =          (1<<6),
+	IMV_HCD_ATTR_RESIDENT_APP_NAME =         (1<<7),
+	IMV_HCD_ATTR_TIME_SOURCE =               (1<<8),
+	IMV_HCD_ATTR_USER_APP_ENABLED =          (1<<9),
+	IMV_HCD_ATTR_USER_APP_PERSIST_ENABLED =  (1<<10),
+	IMV_HCD_ATTR_USER_APP_NAME =             (1<<11),
+	IMV_HCD_ATTR_VENDOR_NAME =               (1<<12),
+	IMV_HCD_ATTR_VENDOR_SMI_CODE =           (1<<13),
+	IMV_HCD_ATTR_MUST =                      (1<<14)-1
+};
+
+static imv_hcd_attr_t attr_type_to_flag(pwg_attr_t attr_type)
+{
+	switch (attr_type)
+	{
+		case PWG_HCD_ATTRS_NATURAL_LANG:
+			return IMV_HCD_ATTR_NATURAL_LANG;
+		case PWG_HCD_DEFAULT_PWD_ENABLED:
+			return IMV_HCD_ATTR_DEFAULT_PWD_ENABLED;
+		case PWG_HCD_FIREWALL_SETTING:
+			return IMV_HCD_ATTR_FIREWALL_SETTING;
+		case PWG_HCD_FIRMWARE_NAME:
+			return IMV_HCD_ATTR_FIRMWARE_NAME;
+		case PWG_HCD_FORWARDING_ENABLED:
+			return IMV_HCD_ATTR_FORWARDING_ENABLED;
+		case PWG_HCD_MACHINE_TYPE_MODEL:
+			return IMV_HCD_ATTR_MACHINE_TYPE_MODEL;
+		case PWG_HCD_PSTN_FAX_ENABLED:
+			return IMV_HCD_ATTR_PSTN_FAX_ENABLED;
+		case PWG_HCD_RESIDENT_APP_NAME:
+			return IMV_HCD_ATTR_RESIDENT_APP_NAME;
+		case PWG_HCD_TIME_SOURCE:
+			return IMV_HCD_ATTR_TIME_SOURCE;
+		case PWG_HCD_USER_APP_ENABLED:
+			return IMV_HCD_ATTR_USER_APP_ENABLED;
+		case PWG_HCD_USER_APP_PERSIST_ENABLED:
+			return IMV_HCD_ATTR_USER_APP_PERSIST_ENABLED;
+		case PWG_HCD_USER_APP_NAME:
+			return IMV_HCD_ATTR_USER_APP_NAME;
+		case PWG_HCD_VENDOR_NAME:
+			return IMV_HCD_ATTR_VENDOR_NAME;
+		case PWG_HCD_VENDOR_SMI_CODE:
+			return IMV_HCD_ATTR_VENDOR_SMI_CODE;
+		default:
+			return IMV_HCD_ATTR_NONE;
+	}
+}
+
+/**
+ * Private data of an imv_hcd_agent_t object.
+ */
+struct private_imv_hcd_agent_t {
+
+	/**
+	 * Public members of imv_hcd_agent_t
+	 */
+	imv_agent_if_t public;
+
+	/**
+	 * IMV agent responsible for generic functions
+	 */
+	imv_agent_t *agent;
+
+};
+
+METHOD(imv_agent_if_t, bind_functions, TNC_Result,
+	private_imv_hcd_agent_t *this, TNC_TNCS_BindFunctionPointer bind_function)
+{
+	return this->agent->bind_functions(this->agent, bind_function);
+}
+
+METHOD(imv_agent_if_t, notify_connection_change, TNC_Result,
+	private_imv_hcd_agent_t *this, TNC_ConnectionID id,
+	TNC_ConnectionState new_state)
+{
+	TNC_IMV_Action_Recommendation rec;
+	imv_state_t *state;
+	imv_session_t *session;
+
+	switch (new_state)
+	{
+		case TNC_CONNECTION_STATE_CREATE:
+			state = imv_hcd_state_create(id);
+			return this->agent->create_state(this->agent, state);
+		case TNC_CONNECTION_STATE_DELETE:
+			return this->agent->delete_state(this->agent, id);
+		case TNC_CONNECTION_STATE_ACCESS_ALLOWED:
+		case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
+		case TNC_CONNECTION_STATE_ACCESS_NONE:
+			if (this->agent->get_state(this->agent, id, &state) && imcv_db)
+			{
+				session = state->get_session(state);
+
+				if (session->get_policy_started(session))
+				{
+					switch (new_state)
+					{
+						case TNC_CONNECTION_STATE_ACCESS_ALLOWED:
+							rec = TNC_IMV_ACTION_RECOMMENDATION_ALLOW;
+							break;
+						case TNC_CONNECTION_STATE_ACCESS_ISOLATED:
+							rec = TNC_IMV_ACTION_RECOMMENDATION_ISOLATE;
+							break;
+						case TNC_CONNECTION_STATE_ACCESS_NONE:
+						default:
+							rec = TNC_IMV_ACTION_RECOMMENDATION_NO_ACCESS;
+					}
+					imcv_db->add_recommendation(imcv_db, session, rec);
+					if (!imcv_db->policy_script(imcv_db, session, FALSE))
+					{
+						DBG1(DBG_IMV, "error in policy script stop");
+					}
+				}
+			}
+			/* fall through to default state */
+		default:
+			return this->agent->change_state(this->agent, id, new_state, NULL);
+	}
+}
+
+/**
+ * Process a received message
+ */
+static TNC_Result receive_msg(private_imv_hcd_agent_t *this, imv_state_t *state,
+							  imv_msg_t *in_msg)
+{
+	imv_msg_t *out_msg;
+	imv_hcd_state_t *hcd_state;
+	pa_tnc_attr_t *attr;
+	pen_type_t type;
+	TNC_Result result;
+	bool fatal_error = FALSE, assessment = FALSE;
+	enumerator_t *enumerator;
+
+	hcd_state = (imv_hcd_state_t*)state;
+
+	/* generate an outgoing PA-TNC message - we might need it */
+	out_msg = imv_msg_create_as_reply(in_msg);
+
+	/* parse received PA-TNC message and handle local and remote errors */
+	result = in_msg->receive(in_msg,out_msg, &fatal_error);
+	if (result != TNC_RESULT_SUCCESS)
+	{
+		out_msg->destroy(out_msg);
+		return result;
+	}
+
+	/* analyze PA-TNC attributes */
+	enumerator = in_msg->create_attribute_enumerator(in_msg);
+	while (enumerator->enumerate(enumerator, &attr))
+	{
+		type = attr->get_type(attr);
+
+		if (type.vendor_id == PEN_PWG)
+		{
+			state->set_action_flags(state, attr_type_to_flag(type.type));
+
+			switch (type.type)
+			{
+				case PWG_HCD_ATTRS_NATURAL_LANG:
+				case PWG_HCD_MACHINE_TYPE_MODEL:
+				case PWG_HCD_VENDOR_NAME:
+				case PWG_HCD_TIME_SOURCE:
+				case PWG_HCD_FIRMWARE_NAME:
+				case PWG_HCD_FIRMWARE_PATCHES:
+				case PWG_HCD_FIRMWARE_STRING_VERSION:
+				case PWG_HCD_RESIDENT_APP_NAME:
+				case PWG_HCD_RESIDENT_APP_PATCHES:
+				case PWG_HCD_RESIDENT_APP_STRING_VERSION:
+				case PWG_HCD_USER_APP_NAME:
+				case PWG_HCD_USER_APP_PATCHES:
+				case PWG_HCD_USER_APP_STRING_VERSION:
+				{
+					chunk_t value;
+
+					value = attr->get_value(attr);
+					DBG2(DBG_IMV, "%N: %.*s", pwg_attr_names, type.type,
+								   value.len, value.ptr);
+					break;
+				}
+				case PWG_HCD_FIRMWARE_VERSION:
+				case PWG_HCD_RESIDENT_APP_VERSION:
+				case PWG_HCD_USER_APP_VERSION:
+				{
+					chunk_t value;
+
+					value = attr->get_value(attr);
+					DBG2(DBG_IMV, "%N: %#B", pwg_attr_names, type.type, &value);
+					break;
+				}
+				case PWG_HCD_CERTIFICATION_STATE:
+				case PWG_HCD_CONFIGURATION_STATE:
+				{
+					chunk_t value;
+
+					value = attr->get_value(attr);
+					DBG2(DBG_IMV, "%N: %B", pwg_attr_names, type.type, &value);
+					break;
+				}
+				case PWG_HCD_DEFAULT_PWD_ENABLED:
+				case PWG_HCD_FORWARDING_ENABLED:
+				case PWG_HCD_PSTN_FAX_ENABLED:
+				case PWG_HCD_USER_APP_ENABLED:
+				case PWG_HCD_USER_APP_PERSIST_ENABLED:
+				{
+					generic_attr_bool_t *attr_cast;
+					bool status;
+
+					attr_cast = (generic_attr_bool_t*)attr;
+					status = attr_cast->get_status(attr_cast);
+					DBG2(DBG_IMV, "%N: %s", pwg_attr_names, type.type,
+								   status ? "yes" : "no");
+
+					if (type.type == PWG_HCD_USER_APP_ENABLED && !status)
+					{
+						/* do not request user applications */
+						state->set_action_flags(state,
+												IMV_HCD_ATTR_USER_APP_NAME);
+					}		
+					break;
+				}
+				case PWG_HCD_VENDOR_SMI_CODE:
+				{
+					pwg_attr_vendor_smi_code_t *attr_cast;
+					uint32_t smi_code;
+
+					attr_cast = (pwg_attr_vendor_smi_code_t*)attr;
+					smi_code = attr_cast->get_vendor_smi_code(attr_cast);
+					DBG2(DBG_IMV, "%N: 0x%06x (%u)", pwg_attr_names, type.type,
+								  smi_code, smi_code);
+					break;
+				}
+				default:
+					break;
+			}
+		}
+	}
+	enumerator->destroy(enumerator);
+
+	if (fatal_error)
+	{
+		state->set_recommendation(state,
+								TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
+								TNC_IMV_EVALUATION_RESULT_ERROR);
+		assessment = TRUE;
+	}
+
+	if (assessment)
+	{
+		hcd_state->set_handshake_state(hcd_state, IMV_HCD_STATE_END);
+		result = out_msg->send_assessment(out_msg);
+		if (result == TNC_RESULT_SUCCESS)
+		{
+			result = this->agent->provide_recommendation(this->agent, state);
+		}
+	}
+	else
+	{
+		/* send PA-TNC message with the EXCL flag set */
+		result = out_msg->send(out_msg, TRUE);
+	}
+	out_msg->destroy(out_msg);
+
+	return result;
+}
+
+METHOD(imv_agent_if_t, receive_message, TNC_Result,
+	private_imv_hcd_agent_t *this, TNC_ConnectionID id,
+	TNC_MessageType msg_type, chunk_t msg)
+{
+	imv_state_t *state;
+	imv_msg_t *in_msg;
+	TNC_Result result;
+
+	if (!this->agent->get_state(this->agent, id, &state))
+	{
+		return TNC_RESULT_FATAL;
+	}
+	in_msg = imv_msg_create_from_data(this->agent, state, id, msg_type, msg);
+	result = receive_msg(this, state, in_msg);
+	in_msg->destroy(in_msg);
+
+	return result;
+}
+
+METHOD(imv_agent_if_t, receive_message_long, TNC_Result,
+	private_imv_hcd_agent_t *this, TNC_ConnectionID id,
+	TNC_UInt32 src_imc_id, TNC_UInt32 dst_imv_id,
+	TNC_VendorID msg_vid, TNC_MessageSubtype msg_subtype, chunk_t msg)
+{
+	imv_state_t *state;
+	imv_msg_t *in_msg;
+	TNC_Result result;
+
+	if (!this->agent->get_state(this->agent, id, &state))
+	{
+		return TNC_RESULT_FATAL;
+	}
+	in_msg = imv_msg_create_from_long_data(this->agent, state, id,
+					src_imc_id, dst_imv_id, msg_vid, msg_subtype, msg);
+	result = receive_msg(this, state, in_msg);
+	in_msg->destroy(in_msg);
+
+	return result;
+
+}
+
+/**
+ * Build an IETF Attribute Request attribute for missing attributes
+ */
+static pa_tnc_attr_t* build_attr_request(uint32_t received)
+{
+	pa_tnc_attr_t *attr;
+	ietf_attr_attr_request_t *attr_cast;
+
+	attr = ietf_attr_attr_request_create(PEN_RESERVED, 0);
+	attr_cast = (ietf_attr_attr_request_t*)attr;
+
+	if (!(received & IMV_HCD_ATTR_NATURAL_LANG))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_ATTRS_NATURAL_LANG);
+	}
+	if (!(received & IMV_HCD_ATTR_DEFAULT_PWD_ENABLED))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_DEFAULT_PWD_ENABLED);
+	}
+	if (!(received & IMV_HCD_ATTR_FIREWALL_SETTING))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_FIREWALL_SETTING);
+	}
+	if (!(received & IMV_HCD_ATTR_FIRMWARE_NAME))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_FIRMWARE_NAME);
+	}
+	if (!(received & IMV_HCD_ATTR_FORWARDING_ENABLED))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_FORWARDING_ENABLED);
+	}
+	if (!(received & IMV_HCD_ATTR_MACHINE_TYPE_MODEL))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_MACHINE_TYPE_MODEL);
+	}
+	if (!(received & IMV_HCD_ATTR_PSTN_FAX_ENABLED))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_PSTN_FAX_ENABLED);
+	}
+	if (!(received & IMV_HCD_ATTR_RESIDENT_APP_NAME))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_RESIDENT_APP_NAME);
+	}
+	if (!(received & IMV_HCD_ATTR_TIME_SOURCE))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_TIME_SOURCE);
+	}
+	if (!(received & IMV_HCD_ATTR_USER_APP_ENABLED))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_USER_APP_ENABLED);
+	}
+	if (!(received & IMV_HCD_ATTR_USER_APP_PERSIST_ENABLED))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_USER_APP_PERSIST_ENABLED);
+	}
+	if (!(received & IMV_HCD_ATTR_USER_APP_NAME))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_USER_APP_NAME);
+	}
+	if (!(received & IMV_HCD_ATTR_VENDOR_NAME))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_VENDOR_NAME);
+	}
+	if (!(received & IMV_HCD_ATTR_VENDOR_SMI_CODE))
+	{
+		attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_VENDOR_SMI_CODE);
+	}
+	attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_CERTIFICATION_STATE);
+	attr_cast->add(attr_cast, PEN_PWG, PWG_HCD_CONFIGURATION_STATE);
+
+	return attr;
+}
+
+METHOD(imv_agent_if_t, batch_ending, TNC_Result,
+	private_imv_hcd_agent_t *this, TNC_ConnectionID id)
+{
+	imv_msg_t *out_msg;
+	imv_state_t *state;
+	imv_hcd_state_t *hcd_state;
+	imv_hcd_handshake_state_t handshake_state;
+	pa_tnc_attr_t *attr;
+	TNC_IMVID imv_id;
+	TNC_Result result = TNC_RESULT_SUCCESS;
+	uint32_t received;
+
+	if (!this->agent->get_state(this->agent, id, &state))
+	{
+		return TNC_RESULT_FATAL;
+	}
+	hcd_state = (imv_hcd_state_t*)state;
+	handshake_state = hcd_state->get_handshake_state(hcd_state);
+	received = state->get_action_flags(state);
+	imv_id = this->agent->get_id(this->agent);
+
+	if (handshake_state == IMV_HCD_STATE_END)
+	{
+		return TNC_RESULT_SUCCESS;
+	}
+
+	/* create an empty out message - we might need it */
+	out_msg = imv_msg_create(this->agent, state, id, imv_id, TNC_IMCID_ANY,
+							 msg_types[0]);
+
+	if (handshake_state == IMV_HCD_STATE_INIT)
+	{
+		size_t max_attr_size = HCD_MAX_ATTR_SIZE;
+		size_t max_seg_size;
+		seg_contract_t *contract;
+		seg_contract_manager_t *contracts;
+		char buf[BUF_LEN];
+
+		/* Determine maximum PA-TNC attribute segment size */
+		max_seg_size = state->get_max_msg_len(state)
+								- PA_TNC_HEADER_SIZE 
+								- PA_TNC_ATTR_HEADER_SIZE
+								- TCG_SEG_ATTR_SEG_ENV_HEADER
+								- PA_TNC_ATTR_HEADER_SIZE
+								- TCG_SEG_ATTR_MAX_SIZE_SIZE;
+
+		/* Announce support of PA-TNC segmentation to IMC */
+		contract = seg_contract_create(msg_types[0], max_attr_size,
+										max_seg_size, TRUE, imv_id, FALSE);
+		contract->get_info_string(contract, buf, BUF_LEN, TRUE);
+		DBG2(DBG_IMV, "%s", buf);
+		contracts = state->get_contracts(state);
+		contracts->add_contract(contracts, contract);
+		attr = tcg_seg_attr_max_size_create(max_attr_size, max_seg_size, TRUE);
+		out_msg->add_attribute(out_msg, attr);
+
+		if ((received & IMV_HCD_ATTR_MUST) != IMV_HCD_ATTR_MUST)
+		{
+			/* create attribute request for missing mandatory attributes */
+			out_msg->add_attribute(out_msg, build_attr_request(received));
+		}
+		hcd_state->set_handshake_state(hcd_state, IMV_HCD_STATE_ATTR_REQ);
+	}
+
+	/* send non-empty PA-TNC message with excl flag not set */
+	if (out_msg->get_attribute_count(out_msg))
+	{
+		result = out_msg->send(out_msg, FALSE);
+	}
+	out_msg->destroy(out_msg);
+
+	return result;
+}
+
+METHOD(imv_agent_if_t, solicit_recommendation, TNC_Result,
+	private_imv_hcd_agent_t *this, TNC_ConnectionID id)
+{
+	imv_state_t *state;
+
+	if (!this->agent->get_state(this->agent, id, &state))
+	{
+		return TNC_RESULT_FATAL;
+	}
+	return this->agent->provide_recommendation(this->agent, state);
+}
+
+METHOD(imv_agent_if_t, destroy, void,
+	private_imv_hcd_agent_t *this)
+{
+	DESTROY_IF(this->agent);
+	free(this);
+}
+
+/**
+ * Described in header.
+ */
+imv_agent_if_t *imv_hcd_agent_create(const char *name, TNC_IMVID id,
+									TNC_Version *actual_version)
+{
+	private_imv_hcd_agent_t *this;
+	imv_agent_t *agent;
+
+	agent = imv_agent_create(name, msg_types, countof(msg_types), id,
+							 actual_version);
+	if (!agent)
+	{
+		return NULL;
+	}
+
+	INIT(this,
+		.public = {
+			.bind_functions = _bind_functions,
+			.notify_connection_change = _notify_connection_change,
+			.receive_message = _receive_message,
+			.receive_message_long = _receive_message_long,
+			.batch_ending = _batch_ending,
+			.solicit_recommendation = _solicit_recommendation,
+			.destroy = _destroy,
+		},
+		.agent = agent,
+	);
+
+	return &this->public;
+}
+
diff --git a/src/libimcv/plugins/imv_hcd/imv_hcd_agent.h b/src/libimcv/plugins/imv_hcd/imv_hcd_agent.h
new file mode 100644
index 000000000..d4e2e3f0e
--- /dev/null
+++ b/src/libimcv/plugins/imv_hcd/imv_hcd_agent.h
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2015 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 imv_hcd_agent_t imv_hcd_agent
+ * @{ @ingroup imv_hcd
+ */
+
+#ifndef IMV_HCD_AGENT_H_
+#define IMV_HCD_AGENT_H_
+
+#include <imv/imv_agent_if.h>
+
+/**
+ * Creates a HCD IMV agent
+ *
+ * @param name					Name of the IMV
+ * @param id					ID of the IMV
+ * @param actual_version		TNC IF-IMV version
+ */
+imv_agent_if_t* imv_hcd_agent_create(const char* name, TNC_IMVID id,
+									TNC_Version *actual_version);
+
+#endif /** IMV_HCD_AGENT_H_ @}*/
diff --git a/src/libimcv/plugins/imv_hcd/imv_hcd_state.c b/src/libimcv/plugins/imv_hcd/imv_hcd_state.c
new file mode 100644
index 000000000..69cb3753e
--- /dev/null
+++ b/src/libimcv/plugins/imv_hcd/imv_hcd_state.c
@@ -0,0 +1,264 @@
+/*
+ * Copyright (C) 2015 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 "imv_hcd_state.h"
+
+#include <tncif_policy.h>
+
+#include <utils/debug.h>
+
+typedef struct private_imv_hcd_state_t private_imv_hcd_state_t;
+
+/**
+ * Private data of an imv_hcd_state_t object.
+ */
+struct private_imv_hcd_state_t {
+
+	/**
+	 * Public members of imv_hcd_state_t
+	 */
+	imv_hcd_state_t public;
+
+	/**
+	 * TNCCS connection ID
+	 */
+	TNC_ConnectionID connection_id;
+
+	/**
+	 * TNCCS connection state
+	 */
+	TNC_ConnectionState state;
+
+	/**
+	 * Does the TNCCS connection support long message types?
+	 */
+	bool has_long;
+
+	/**
+	 * Does the TNCCS connection support exclusive delivery?
+	 */
+	bool has_excl;
+
+	/**
+	 * Maximum PA-TNC message size for this TNCCS connection
+	 */
+	uint32_t max_msg_len;
+
+	/**
+	 * Flags set for completed actions
+	 */
+	uint32_t action_flags;
+
+	/**
+	 * IMV database session associated with TNCCS connection
+	 */
+	imv_session_t *session;
+
+	/**
+	 * PA-TNC attribute segmentation contracts associated with TNCCS connection
+	 */
+	seg_contract_manager_t *contracts;
+
+	/**
+	 * IMV action recommendation
+	 */
+	TNC_IMV_Action_Recommendation rec;
+
+	/**
+	 * IMV evaluation result
+	 */
+	TNC_IMV_Evaluation_Result eval;
+
+	/**
+	 * IMV OS handshake state
+	 */
+	imv_hcd_handshake_state_t handshake_state;
+
+};
+
+METHOD(imv_state_t, get_connection_id, TNC_ConnectionID,
+	private_imv_hcd_state_t *this)
+{
+	return this->connection_id;
+}
+
+METHOD(imv_state_t, has_long, bool,
+	private_imv_hcd_state_t *this)
+{
+	return this->has_long;
+}
+
+METHOD(imv_state_t, has_excl, bool,
+	private_imv_hcd_state_t *this)
+{
+	return this->has_excl;
+}
+
+METHOD(imv_state_t, set_flags, void,
+	private_imv_hcd_state_t *this, bool has_long, bool has_excl)
+{
+	this->has_long = has_long;
+	this->has_excl = has_excl;
+}
+
+METHOD(imv_state_t, set_max_msg_len, void,
+	private_imv_hcd_state_t *this, uint32_t max_msg_len)
+{
+	this->max_msg_len = max_msg_len;
+}
+
+METHOD(imv_state_t, get_max_msg_len, uint32_t,
+	private_imv_hcd_state_t *this)
+{
+	return this->max_msg_len;
+}
+
+METHOD(imv_state_t, set_action_flags, void,
+	private_imv_hcd_state_t *this, uint32_t flags)
+{
+	this->action_flags |= flags;
+}
+
+METHOD(imv_state_t, get_action_flags, uint32_t,
+	private_imv_hcd_state_t *this)
+{
+	return this->action_flags;
+}
+
+METHOD(imv_state_t, set_session, void,
+	private_imv_hcd_state_t *this, imv_session_t *session)
+{
+	this->session = session;
+}
+
+METHOD(imv_state_t, get_session, imv_session_t*,
+	private_imv_hcd_state_t *this)
+{
+	return this->session;
+}
+
+METHOD(imv_state_t, get_contracts, seg_contract_manager_t*,
+	private_imv_hcd_state_t *this)
+{
+	return this->contracts;
+}
+
+METHOD(imv_state_t, get_recommendation, void,
+	private_imv_hcd_state_t *this, TNC_IMV_Action_Recommendation *rec,
+								  TNC_IMV_Evaluation_Result *eval)
+{
+	*rec = this->rec;
+	*eval = this->eval;
+}
+
+METHOD(imv_state_t, set_recommendation, void,
+	private_imv_hcd_state_t *this, TNC_IMV_Action_Recommendation rec,
+								  TNC_IMV_Evaluation_Result eval)
+{
+	this->rec = rec;
+	this->eval = eval;
+}
+
+METHOD(imv_state_t, update_recommendation, void,
+	private_imv_hcd_state_t *this, TNC_IMV_Action_Recommendation rec,
+								  TNC_IMV_Evaluation_Result eval)
+{
+	this->rec  = tncif_policy_update_recommendation(this->rec, rec);
+	this->eval = tncif_policy_update_evaluation(this->eval, eval);
+}
+
+METHOD(imv_state_t, change_state, void,
+	private_imv_hcd_state_t *this, TNC_ConnectionState new_state)
+{
+	this->state = new_state;
+}
+
+METHOD(imv_state_t, get_reason_string, bool,
+	private_imv_hcd_state_t *this, enumerator_t *language_enumerator,
+	chunk_t *reason_string, char **reason_language)
+{
+	return FALSE;
+}
+
+METHOD(imv_state_t, get_remediation_instructions, bool,
+	private_imv_hcd_state_t *this, enumerator_t *language_enumerator,
+	chunk_t *string, char **lang_code, char **uri)
+{
+	return FALSE;
+}
+
+METHOD(imv_state_t, destroy, void,
+	private_imv_hcd_state_t *this)
+{
+	DESTROY_IF(this->session);
+	this->contracts->destroy(this->contracts);
+	free(this);
+}
+
+METHOD(imv_hcd_state_t, set_handshake_state, void,
+	private_imv_hcd_state_t *this, imv_hcd_handshake_state_t new_state)
+{
+	this->handshake_state = new_state;
+}
+
+METHOD(imv_hcd_state_t, get_handshake_state, imv_hcd_handshake_state_t,
+	private_imv_hcd_state_t *this)
+{
+	return this->handshake_state;
+}
+
+/**
+ * Described in header.
+ */
+imv_state_t *imv_hcd_state_create(TNC_ConnectionID connection_id)
+{
+	private_imv_hcd_state_t *this;
+
+	INIT(this,
+		.public = {
+			.interface = {
+				.get_connection_id = _get_connection_id,
+				.has_long = _has_long,
+				.has_excl = _has_excl,
+				.set_flags = _set_flags,
+				.set_max_msg_len = _set_max_msg_len,
+				.get_max_msg_len = _get_max_msg_len,
+				.set_action_flags = _set_action_flags,
+				.get_action_flags = _get_action_flags,
+				.set_session = _set_session,
+				.get_session = _get_session,
+				.get_contracts = _get_contracts,
+				.change_state = _change_state,
+				.get_recommendation = _get_recommendation,
+				.set_recommendation = _set_recommendation,
+				.update_recommendation = _update_recommendation,
+				.get_reason_string = _get_reason_string,
+				.get_remediation_instructions = _get_remediation_instructions,
+				.destroy = _destroy,
+			},
+			.set_handshake_state = _set_handshake_state,
+			.get_handshake_state = _get_handshake_state,
+		},
+		.state = TNC_CONNECTION_STATE_CREATE,
+		.rec = TNC_IMV_ACTION_RECOMMENDATION_NO_RECOMMENDATION,
+		.eval = TNC_IMV_EVALUATION_RESULT_DONT_KNOW,
+		.connection_id = connection_id,
+		.contracts = seg_contract_manager_create(),
+	);
+
+	return &this->public.interface;
+}
+
+
diff --git a/src/libimcv/plugins/imv_hcd/imv_hcd_state.h b/src/libimcv/plugins/imv_hcd/imv_hcd_state.h
new file mode 100644
index 000000000..2b1c02c23
--- /dev/null
+++ b/src/libimcv/plugins/imv_hcd/imv_hcd_state.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2015 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 imv_hcd imv_hcd
+ * @ingroup libimcv_plugins
+ *
+ * @defgroup imv_hcd_state_t imv_hcd_state
+ * @{ @ingroup imv_hcd
+ */
+
+#ifndef IMV_HCD_STATE_H_
+#define IMV_HCD_STATE_H_
+
+#include <imv/imv_state.h>
+#include <library.h>
+
+typedef struct imv_hcd_state_t imv_hcd_state_t;
+typedef enum imv_hcd_handshake_state_t imv_hcd_handshake_state_t;
+typedef enum os_settings_t os_settings_t;
+
+/**
+ * IMV OS Handshake States (state machine)
+ */
+enum imv_hcd_handshake_state_t {
+	IMV_HCD_STATE_INIT,
+	IMV_HCD_STATE_ATTR_REQ,
+	IMV_HCD_STATE_END
+};
+
+/**
+ * Internal state of an imv_hcd_t connection instance
+ */
+struct imv_hcd_state_t {
+
+	/**
+	 * imv_state_t interface
+	 */
+	imv_state_t interface;
+
+	/**
+	 * Set state of the handshake
+	 *
+	 * @param new_state			the handshake state of IMV
+	 */
+	void (*set_handshake_state)(imv_hcd_state_t *this,
+								imv_hcd_handshake_state_t new_state);
+
+	/**
+	 * Get state of the handshake
+	 *
+	 * @return					the handshake state of IMV
+	 */
+	imv_hcd_handshake_state_t (*get_handshake_state)(imv_hcd_state_t *this);
+
+};
+
+/**
+ * Create an imv_hcd_state_t instance
+ *
+ * @param id			connection ID
+ */
+imv_state_t* imv_hcd_state_create(TNC_ConnectionID id);
+
+#endif /** IMV_HCD_STATE_H_ @}*/