- nonce payload defined
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Martin Willi
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a6966a4801
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/**
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* @file nonce_payload.h
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*
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* @brief Declaration of the class nonce_payload_t.
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*
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* An object of this type represents an IKEv2 Nonce-Payload.
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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 "encodings.h"
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#include "../utils/allocator.h"
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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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typedef struct private_nonce_payload_s private_nonce_payload_t;
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struct private_nonce_payload_s {
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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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* @return
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* SUCCESS in any case
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*/
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status_t (*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, offsetof(private_nonce_payload_t, nonce) }
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};
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/**
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* length of a nonce payload without a nonce in int
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*/
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#define NONCE_PAYLOAD_HEADER_LENGTH 4
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/**
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* Implements payload_t's and nonce_payload_t's destroy function.
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* See #payload_s.destroy or nonce_payload_s.destroy for description.
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*/
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static status_t destroy(private_nonce_payload_t *this)
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{
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if (this->nonce.ptr)
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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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return SUCCESS;
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}
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/**
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* Implements nonce_payload_t's set_nonce function.
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* See #nonce_payload_t.set_nonce for description.
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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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if (nonce.len >= 16 && nonce.len <= 256)
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{
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this->nonce.len = nonce.len;
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this->nonce.ptr = allocator_clone_bytes(nonce.ptr, nonce.len);
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if (this->nonce.ptr == NULL)
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{
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return OUT_OF_RES;
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}
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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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return INVALID_ARG;
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}
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/**
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* Implements nonce_payload_t's get_nonce function.
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* See #nonce_payload_t.get_nonce for description.
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*/
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static status_t get_nonce(private_nonce_payload_t *this, chunk_t *nonce)
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{
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nonce->len = this->nonce.len;
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nonce->ptr = allocator_clone_bytes(this->nonce.ptr, this->nonce.len);
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if (nonce->ptr == NULL)
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{
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return OUT_OF_RES;
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}
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return SUCCESS;
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}
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/**
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* Implements payload_t's get_encoding_rules function.
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* See #payload_s.get_encoding_rules for description.
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*/
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static status_t 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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return SUCCESS;
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}
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/**
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* Implements payload_t's get_type function.
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* See #payload_s.get_type for description.
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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 SECURITY_ASSOCIATION;
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}
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/**
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* Implements payload_t's get_next_type function.
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* See #payload_s.get_next_type for description.
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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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* Implements payload_t's set_next_type function.
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* See #payload_s.set_next_type for description.
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*/
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static status_t 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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return SUCCESS;
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}
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/**
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* Implements payload_t's get_length function.
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* See #payload_s.get_length for description.
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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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* 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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if (this == NULL)
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{
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return NULL;
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}
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this->public.payload_interface.get_encoding_rules = (status_t (*) (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 = (status_t (*) (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 = (status_t (*) (payload_t *))destroy;
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this->public.destroy = (status_t (*) (nonce_payload_t *)) destroy;
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this->public.set_nonce = (status_t (*) (nonce_payload_t *,chunk_t)) set_nonce;
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this->public.get_nonce = (status_t (*) (nonce_payload_t *,chunk_t*)) get_nonce;
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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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return (&(this->public));
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}
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@ -0,0 +1,86 @@
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/**
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* @file nonce_payload.h
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*
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* @brief Declaration of the class nonce_payload_t.
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*
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* An object of this type represents an IKEv2 Nonce-Payload.
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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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#ifndef NONCE_PAYLOAD_H_
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#define NONCE_PAYLOAD_H_
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#include "../types.h"
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#include "payload.h"
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/**
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* Object representing an IKEv2 Nonce payload
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*
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* The Nonce payload format is described in draft section 3.3.
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*
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*/
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typedef struct nonce_payload_s nonce_payload_t;
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struct nonce_payload_s {
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/**
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* implements payload_t interface
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*/
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payload_t payload_interface;
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/**
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* @brief Set the nonce value.
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*
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* @param this calling nonce_payload_t object
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* @param nonce chunk containing the nonce, will be cloned
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* @return SUCCESS in any case
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*/
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status_t (*set_nonce) (nonce_payload_t *this, chunk_t nonce);
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/**
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* @brief Get the nonce value.
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*
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* @param this calling nonce_payload_t object
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* @param[out] nonce chunk where the cloned nonce data is located
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* @return SUCCESS in any case
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*/
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status_t (*get_nonce) (nonce_payload_t *this, chunk_t *nonce);
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/**
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* @brief Destroys an nonce_payload_t object.
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*
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* @param this nonce_payload_t object to destroy
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* @return
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* SUCCESS in any case
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*/
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status_t (*destroy) (nonce_payload_t *this);
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};
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/**
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* @brief Creates an empty nonce_payload_t object
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*
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* @return
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* - created nonce_payload_t object, or
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* - NULL if failed
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*/
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nonce_payload_t *nonce_payload_create();
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#endif /*NONCE_PAYLOAD_H_*/
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