294 lines
7.9 KiB
C
294 lines
7.9 KiB
C
/*
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* Copyright (C) 2007 Tobias Brunner
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* Copyright (C) 2005-2006 Martin Willi
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* Copyright (C) 2005 Jan Hutter
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*
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* 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 <stddef.h>
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#include "id_payload.h"
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#include <daemon.h>
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#include <encoding/payloads/encodings.h>
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typedef struct private_id_payload_t private_id_payload_t;
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/**
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* Private data of an id_payload_t object.
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*
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*/
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struct private_id_payload_t {
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/**
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* Public id_payload_t interface.
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*/
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id_payload_t public;
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/**
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* one of ID_INITIATOR, ID_RESPONDER
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*/
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payload_type_t payload_type;
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/**
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* Next payload type.
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*/
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u_int8_t next_payload;
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/**
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* Critical flag.
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*/
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bool critical;
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/**
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* Length of this payload.
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*/
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u_int16_t payload_length;
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/**
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* Type of the ID Data.
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*/
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u_int8_t id_type;
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/**
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* The contained id data value.
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*/
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chunk_t id_data;
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};
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/**
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* Encoding rules to parse or generate a ID payload
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*
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* The defined offsets are the positions in a object of type
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* private_id_payload_t.
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*
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*/
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encoding_rule_t id_payload_encodings[] = {
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/* 1 Byte next payload type, stored in the field next_payload */
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{ U_INT_8, offsetof(private_id_payload_t, next_payload) },
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/* the critical bit */
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{ FLAG, offsetof(private_id_payload_t, critical) },
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/* 7 Bit reserved bits, nowhere stored */
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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{ RESERVED_BIT, 0 },
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/* Length of the whole payload*/
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{ PAYLOAD_LENGTH, offsetof(private_id_payload_t, payload_length) },
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/* 1 Byte ID type*/
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{ U_INT_8, offsetof(private_id_payload_t, id_type) },
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/* 3 reserved bytes */
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{ RESERVED_BYTE, 0 },
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{ RESERVED_BYTE, 0 },
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{ RESERVED_BYTE, 0 },
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/* some id data bytes, length is defined in PAYLOAD_LENGTH */
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{ ID_DATA, offsetof(private_id_payload_t, id_data) }
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};
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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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! Next Payload !C! RESERVED ! Payload Length !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! ID Type ! RESERVED |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! !
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~ Identification Data ~
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! !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/**
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* Implementation of payload_t.verify.
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*/
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static status_t verify(private_id_payload_t *this)
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{
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if ((this->id_type == 0) ||
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(this->id_type == 4) ||
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((this->id_type >= 6) && (this->id_type <= 8)) ||
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((this->id_type >= 12) && (this->id_type <= 200)))
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{
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/* reserved IDs */
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DBG1(DBG_ENC, "received ID with reserved type %d", this->id_type);
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return FAILED;
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}
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return SUCCESS;
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}
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/**
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* Implementation of id_payload_t.get_encoding_rules.
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*/
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static void get_encoding_rules(private_id_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = id_payload_encodings;
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*rule_count = sizeof(id_payload_encodings) / sizeof(encoding_rule_t);
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}
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/**
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* Implementation of payload_t.get_type.
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*/
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static payload_type_t get_payload_type(private_id_payload_t *this)
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{
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return this->payload_type;
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}
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/**
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* Implementation of payload_t.get_next_type.
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*/
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static payload_type_t get_next_type(private_id_payload_t *this)
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{
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return this->next_payload;
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}
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/**
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* Implementation of payload_t.set_next_type.
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*/
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static void set_next_type(private_id_payload_t *this,payload_type_t type)
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{
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this->next_payload = type;
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}
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/**
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* Implementation of payload_t.get_length.
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*/
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static size_t get_length(private_id_payload_t *this)
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{
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return this->payload_length;
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}
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/**
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* Implementation of id_payload_t.set_type.
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*/
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static void set_id_type (private_id_payload_t *this, id_type_t type)
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{
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this->id_type = type;
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}
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/**
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* Implementation of id_payload_t.get_id_type.
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*/
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static id_type_t get_id_type (private_id_payload_t *this)
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{
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return (this->id_type);
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}
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/**
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* Implementation of id_payload_t.set_data.
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*/
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static void set_data (private_id_payload_t *this, chunk_t data)
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{
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if (this->id_data.ptr != NULL)
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{
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chunk_free(&(this->id_data));
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}
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this->id_data.ptr = clalloc(data.ptr,data.len);
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this->id_data.len = data.len;
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this->payload_length = ID_PAYLOAD_HEADER_LENGTH + this->id_data.len;
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}
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/**
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* Implementation of id_payload_t.get_data_clone.
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*/
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static chunk_t get_data (private_id_payload_t *this)
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{
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return (this->id_data);
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}
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/**
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* Implementation of id_payload_t.get_data_clone.
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*/
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static chunk_t get_data_clone (private_id_payload_t *this)
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{
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chunk_t cloned_data;
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if (this->id_data.ptr == NULL)
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{
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return (this->id_data);
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}
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cloned_data.ptr = clalloc(this->id_data.ptr,this->id_data.len);
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cloned_data.len = this->id_data.len;
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return cloned_data;
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}
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/**
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* Implementation of id_payload_t.get_identification.
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*/
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static identification_t *get_identification (private_id_payload_t *this)
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{
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return identification_create_from_encoding(this->id_type,this->id_data);
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}
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/**
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* Implementation of payload_t.destroy and id_payload_t.destroy.
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*/
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static void destroy(private_id_payload_t *this)
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{
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if (this->id_data.ptr != NULL)
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{
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chunk_free(&(this->id_data));
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}
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free(this);
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}
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/*
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* Described in header.
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*/
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id_payload_t *id_payload_create(payload_type_t payload_type)
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{
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private_id_payload_t *this = malloc_thing(private_id_payload_t);
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/* interface functions */
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this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
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this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
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this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
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this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
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this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type;
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this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_payload_type;
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this->public.payload_interface.destroy = (void (*) (payload_t *))destroy;
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/* public functions */
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this->public.destroy = (void (*) (id_payload_t *)) destroy;
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this->public.set_id_type = (void (*) (id_payload_t *,id_type_t)) set_id_type;
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this->public.get_id_type = (id_type_t (*) (id_payload_t *)) get_id_type;
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this->public.set_data = (void (*) (id_payload_t *,chunk_t)) set_data;
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this->public.get_data = (chunk_t (*) (id_payload_t *)) get_data;
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this->public.get_data_clone = (chunk_t (*) (id_payload_t *)) get_data_clone;
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this->public.get_identification = (identification_t * (*) (id_payload_t *this)) get_identification;
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/* private variables */
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this->critical = FALSE;
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this->next_payload = NO_PAYLOAD;
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this->payload_length =ID_PAYLOAD_HEADER_LENGTH;
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this->id_data = chunk_empty;
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this->payload_type = payload_type;
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return (&(this->public));
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}
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/*
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* Described in header.
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*/
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id_payload_t *id_payload_create_from_identification(payload_type_t payload_type, identification_t *identification)
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{
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id_payload_t *this= id_payload_create(payload_type);
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this->set_data(this,identification->get_encoding(identification));
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this->set_id_type(this,identification->get_type(identification));
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return this;
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}
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