248 lines
6.5 KiB
C
248 lines
6.5 KiB
C
/**
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* @file nonce_payload.h
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*
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* @brief Implementation of nonce_payload_t.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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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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/* offsetof macro */
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#include <stddef.h>
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#include "nonce_payload.h"
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#include <encoding/payloads/encodings.h>
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#include <utils/allocator.h>
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typedef struct private_nonce_payload_t private_nonce_payload_t;
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/**
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* Private data of an nonce_payload_t object.
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*
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*/
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struct private_nonce_payload_t {
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/**
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* Public nonce_payload_t interface.
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*/
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nonce_payload_t public;
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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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* The contained nonce value.
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*/
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chunk_t nonce;
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/**
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* @brief Computes the length of this payload.
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*
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* @param this calling private_nonce_payload_t object
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*/
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void (*compute_length) (private_nonce_payload_t *this);
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};
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/**
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* Encoding rules to parse or generate a nonce 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_nonce_payload_t.
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*
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*/
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encoding_rule_t nonce_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_nonce_payload_t, next_payload) },
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/* the critical bit */
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{ FLAG, offsetof(private_nonce_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 nonce payload*/
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{ PAYLOAD_LENGTH, offsetof(private_nonce_payload_t, payload_length) },
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/* some nonce bytes, lenth is defined in PAYLOAD_LENGTH */
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{ NONCE_DATA, offsetof(private_nonce_payload_t, nonce) }
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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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! !
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~ Nonce 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_nonce_payload_t *this)
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{
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if (this->critical)
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{
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/* critical bit is set! */
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return FAILED;
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}
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if ((this->nonce.len < 16) || ((this->nonce.len > 256)))
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{
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/* nonce length is wrong */
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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 nonce_payload_t.set_nonce.
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*/
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static status_t set_nonce(private_nonce_payload_t *this, chunk_t nonce)
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{
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this->nonce.ptr = allocator_clone_bytes(nonce.ptr, nonce.len);
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this->nonce.len = nonce.len;
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this->payload_length = NONCE_PAYLOAD_HEADER_LENGTH + nonce.len;
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return SUCCESS;
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}
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/**
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* Implementation of nonce_payload_t.get_nonce.
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*/
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static chunk_t get_nonce(private_nonce_payload_t *this)
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{
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chunk_t nonce;
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nonce.ptr = allocator_clone_bytes(this->nonce.ptr,this->nonce.len);
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nonce.len = this->nonce.len;
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return nonce;
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}
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/**
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* Implementation of nonce_payload_t.get_encoding_rules.
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*/
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static void get_encoding_rules(private_nonce_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = nonce_payload_encodings;
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*rule_count = sizeof(nonce_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_type(private_nonce_payload_t *this)
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{
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return NONCE;
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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_nonce_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_nonce_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_nonce_payload_t *this)
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{
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this->compute_length(this);
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return this->payload_length;
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}
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/**
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* Implementation of private_id_payload_t.compute_length.
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*/
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static void compute_length(private_nonce_payload_t *this)
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{
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this->payload_length = NONCE_PAYLOAD_HEADER_LENGTH + this->nonce.len;
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}
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/**
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* Implementation of payload_t.destroy and nonce_payload_t.destroy.
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*/
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static void destroy(private_nonce_payload_t *this)
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{
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if (this->nonce.ptr != NULL)
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{
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allocator_free(this->nonce.ptr);
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}
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allocator_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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nonce_payload_t *nonce_payload_create()
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{
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private_nonce_payload_t *this = allocator_alloc_thing(private_nonce_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_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 (*) (nonce_payload_t *)) destroy;
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this->public.set_nonce = (void (*) (nonce_payload_t *,chunk_t)) set_nonce;
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this->public.get_nonce = (chunk_t (*) (nonce_payload_t *)) get_nonce;
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/* private functions */
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this->compute_length = compute_length;
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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 = NONCE_PAYLOAD_HEADER_LENGTH;
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this->nonce.ptr = NULL;
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this->nonce.len = 0;
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return (&(this->public));
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}
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