307 lines
8.1 KiB
C
307 lines
8.1 KiB
C
/*
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* Copyright (C) 2011-2014 Andreas Steffen
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*
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* HSR Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "pa_tnc_attr_manager.h"
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#include "imcv.h"
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#include "pa_tnc_attr.h"
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#include "ietf/ietf_attr_pa_tnc_error.h"
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#include <collections/linked_list.h>
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#include <utils/debug.h>
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typedef struct private_pa_tnc_attr_manager_t private_pa_tnc_attr_manager_t;
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typedef struct entry_t entry_t;
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struct entry_t {
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pen_t vendor_id;
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enum_name_t *attr_names;
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pa_tnc_attr_create_t attr_create;
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};
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/**
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* Private data of a pa_tnc_attr_manager_t object.
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*
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*/
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struct private_pa_tnc_attr_manager_t {
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/**
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* Public pa_tnc_attr_manager_t interface.
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*/
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pa_tnc_attr_manager_t public;
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/**
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* List of PA-TNC vendor attributes
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*/
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linked_list_t *list;
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};
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METHOD(pa_tnc_attr_manager_t, add_vendor, void,
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private_pa_tnc_attr_manager_t *this, pen_t vendor_id,
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pa_tnc_attr_create_t attr_create, enum_name_t *attr_names)
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{
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entry_t *entry;
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entry = malloc_thing(entry_t);
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entry->vendor_id = vendor_id;
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entry->attr_create = attr_create;
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entry->attr_names = attr_names;
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this->list->insert_last(this->list, entry);
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DBG2(DBG_TNC, "added %N attributes", pen_names, vendor_id);
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}
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METHOD(pa_tnc_attr_manager_t, remove_vendor, void,
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private_pa_tnc_attr_manager_t *this, pen_t vendor_id)
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{
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enumerator_t *enumerator;
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entry_t *entry;
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enumerator = this->list->create_enumerator(this->list);
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while (enumerator->enumerate(enumerator, &entry))
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{
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if (entry->vendor_id == vendor_id)
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{
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this->list->remove_at(this->list, enumerator);
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free(entry);
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DBG2(DBG_TNC, "removed %N attributes", pen_names, vendor_id);
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}
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}
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enumerator->destroy(enumerator);
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}
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METHOD(pa_tnc_attr_manager_t, get_names, enum_name_t*,
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private_pa_tnc_attr_manager_t *this, pen_t vendor_id)
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{
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enumerator_t *enumerator;
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entry_t *entry;
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enum_name_t *attr_names = NULL;
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enumerator = this->list->create_enumerator(this->list);
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while (enumerator->enumerate(enumerator, &entry))
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{
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if (entry->vendor_id == vendor_id)
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{
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attr_names = entry->attr_names;
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break;
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}
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}
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enumerator->destroy(enumerator);
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return attr_names;
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}
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/**
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* PA-TNC attribute
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*
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* 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Flags | PA-TNC Attribute Vendor ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | PA-TNC Attribute Type |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | PA-TNC Attribute Length |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | Attribute Value (Variable Length) |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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METHOD(pa_tnc_attr_manager_t, create, pa_tnc_attr_t*,
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private_pa_tnc_attr_manager_t *this, bio_reader_t *reader, bool segmented,
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uint32_t *offset, chunk_t msg_info, pa_tnc_attr_t **error)
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{
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uint8_t flags;
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uint32_t type, length, value_len;
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chunk_t value;
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ietf_attr_pa_tnc_error_t *error_attr;
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pen_t vendor_id;
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pen_type_t unsupported_type;
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pen_type_t error_code = { PEN_IETF, PA_ERROR_INVALID_PARAMETER };
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enum_name_t *pa_attr_names;
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pa_tnc_attr_t *attr = NULL;
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enumerator_t *enumerator;
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entry_t *entry;
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/* properly initialize error return argument in case of no error */
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*error = NULL;
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if (reader->remaining(reader) < PA_TNC_ATTR_HEADER_SIZE)
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{
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DBG1(DBG_TNC, "insufficient bytes for PA-TNC attribute header");
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*error = ietf_attr_pa_tnc_error_create_with_offset(error_code,
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msg_info, *offset);
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return NULL;
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}
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reader->read_uint8 (reader, &flags);
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reader->read_uint24(reader, &vendor_id);
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reader->read_uint32(reader, &type);
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reader->read_uint32(reader, &length);
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pa_attr_names = imcv_pa_tnc_attributes->get_names(imcv_pa_tnc_attributes,
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vendor_id);
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if (pa_attr_names)
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{
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DBG2(DBG_TNC, "processing PA-TNC attribute type '%N/%N' "
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"0x%06x/0x%08x", pen_names, vendor_id,
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pa_attr_names, type, vendor_id, type);
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}
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else
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{
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DBG2(DBG_TNC, "processing PA-TNC attribute type '%N' "
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"0x%06x/0x%08x", pen_names, vendor_id,
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vendor_id, type);
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}
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if (length < PA_TNC_ATTR_HEADER_SIZE)
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{
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DBG1(DBG_TNC, "%u bytes too small for PA-TNC attribute length",
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length);
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*error = ietf_attr_pa_tnc_error_create_with_offset(error_code,
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msg_info, *offset + PA_TNC_ATTR_INFO_SIZE);
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return NULL;
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}
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length -= PA_TNC_ATTR_HEADER_SIZE;
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value_len = segmented ? reader->remaining(reader) : length;
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if (!reader->read_data(reader, value_len, &value))
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{
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DBG1(DBG_TNC, "insufficient bytes for PA-TNC attribute value");
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*error = ietf_attr_pa_tnc_error_create_with_offset(error_code,
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msg_info, *offset + PA_TNC_ATTR_INFO_SIZE);
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return NULL;
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}
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DBG3(DBG_TNC, "%B", &value);
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if (vendor_id == PEN_RESERVED)
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{
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*error = ietf_attr_pa_tnc_error_create_with_offset(error_code,
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msg_info, *offset + 1);
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return NULL;
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}
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if (type == IETF_ATTR_RESERVED)
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{
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*error = ietf_attr_pa_tnc_error_create_with_offset(error_code,
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msg_info, *offset + 4);
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return NULL;
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}
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/* check if the attribute type is registered */
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enumerator = this->list->create_enumerator(this->list);
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while (enumerator->enumerate(enumerator, &entry))
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{
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if (entry->vendor_id == vendor_id)
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{
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if (entry->attr_create)
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{
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attr = entry->attr_create(type, length, value);
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}
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break;
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}
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}
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enumerator->destroy(enumerator);
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if (!attr)
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{
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if (!(flags & PA_TNC_ATTR_FLAG_NOSKIP))
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{
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DBG1(DBG_TNC, "skipping unsupported PA-TNC attribute");
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(*offset) += PA_TNC_ATTR_HEADER_SIZE + length;
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return NULL;
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}
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DBG1(DBG_TNC, "unsupported PA-TNC attribute with NOSKIP flag");
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unsupported_type = pen_type_create(vendor_id, type);
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error_code = pen_type_create(PEN_IETF, PA_ERROR_ATTR_TYPE_NOT_SUPPORTED);
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*error = ietf_attr_pa_tnc_error_create(error_code, msg_info);
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error_attr = (ietf_attr_pa_tnc_error_t*)(*error);
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error_attr->set_unsupported_attr(error_attr, flags, unsupported_type);
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return NULL;
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}
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(*offset) += PA_TNC_ATTR_HEADER_SIZE;
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return attr;
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}
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METHOD(pa_tnc_attr_manager_t, construct, pa_tnc_attr_t*,
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private_pa_tnc_attr_manager_t *this, pen_t vendor_id, uint32_t type,
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chunk_t value)
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{
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enum_name_t *pa_attr_names;
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pa_tnc_attr_t *attr = NULL;
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enumerator_t *enumerator;
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entry_t *entry;
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pa_attr_names = imcv_pa_tnc_attributes->get_names(imcv_pa_tnc_attributes,
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vendor_id);
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if (pa_attr_names)
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{
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DBG2(DBG_TNC, "generating PA-TNC attribute type '%N/%N' "
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"0x%06x/0x%08x", pen_names, vendor_id,
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pa_attr_names, type, vendor_id, type);
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}
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else
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{
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DBG2(DBG_TNC, "generating PA-TNC attribute type '%N' "
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"0x%06x/0x%08x", pen_names, vendor_id,
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vendor_id, type);
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}
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enumerator = this->list->create_enumerator(this->list);
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while (enumerator->enumerate(enumerator, &entry))
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{
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if (entry->vendor_id == vendor_id)
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{
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if (entry->attr_create)
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{
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attr = entry->attr_create(type, value.len, value);
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}
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break;
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}
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}
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enumerator->destroy(enumerator);
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return attr;
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}
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METHOD(pa_tnc_attr_manager_t, destroy, void,
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private_pa_tnc_attr_manager_t *this)
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{
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this->list->destroy_function(this->list, free);
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free(this);
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}
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/**
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* See header
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*/
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pa_tnc_attr_manager_t *pa_tnc_attr_manager_create(void)
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{
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private_pa_tnc_attr_manager_t *this;
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INIT(this,
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.public = {
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.add_vendor = _add_vendor,
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.remove_vendor = _remove_vendor,
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.get_names = _get_names,
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.create = _create,
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.construct = _construct,
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.destroy = _destroy,
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},
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.list = linked_list_create(),
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);
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return &this->public;
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}
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