513 lines
15 KiB
C
513 lines
15 KiB
C
/**
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* @file proposal_substructure.h
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*
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* @brief Declaration of the class proposal_substructure_t.
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*
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* An object of this type represents an IKEv2 PROPOSAL Substructure and contains transforms.
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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 "proposal_substructure.h"
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#include <encoding/payloads/encodings.h>
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#include <encoding/payloads/transform_substructure.h>
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#include <types.h>
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#include <utils/allocator.h>
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#include <utils/linked_list.h>
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typedef struct private_proposal_substructure_t private_proposal_substructure_t;
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/**
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* Private data of an proposal_substructure_t' Object
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*
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*/
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struct private_proposal_substructure_t {
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/**
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* public proposal_substructure_t interface
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*/
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proposal_substructure_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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* Length of this payload
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*/
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u_int16_t proposal_length;
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/**
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* Proposal number
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*/
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u_int8_t proposal_number;
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/**
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* Protocol ID
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*/
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u_int8_t protocol_id;
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/**
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* SPI size of the following SPI
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*/
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u_int8_t spi_size;
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/**
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* Number of transforms
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*/
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u_int8_t transforms_count;
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/**
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* SPI is stored as chunk
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*/
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chunk_t spi;
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/**
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* Transforms are stored in a linked_list_t
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*/
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linked_list_t * transforms;
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/**
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* @brief Computes the length of this substructure.
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*
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* @param this calling private_proposal_substructure_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_proposal_substructure_t *this);
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};
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/**
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* Encoding rules to parse or generate a Proposal substructure
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*
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* The defined offsets are the positions in a object of type
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* private_proposal_substructure_t.
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*
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*/
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encoding_rule_t proposal_substructure_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_proposal_substructure_t, next_payload) },
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/* Reserved Byte is skipped */
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{ RESERVED_BYTE, 0 },
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/* Length of the whole proposal substructure payload*/
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{ PAYLOAD_LENGTH, offsetof(private_proposal_substructure_t, proposal_length) },
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/* proposal number is a number of 8 bit */
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{ U_INT_8, offsetof(private_proposal_substructure_t, proposal_number) },
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/* protocol ID is a number of 8 bit */
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{ U_INT_8, offsetof(private_proposal_substructure_t, protocol_id) },
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/* SPI Size has its own type */
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{ SPI_SIZE, offsetof(private_proposal_substructure_t, spi_size) },
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/* Number of transforms is a number of 8 bit */
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{ U_INT_8, offsetof(private_proposal_substructure_t, transforms_count) },
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/* SPI is a chunk of variable size*/
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{ SPI, offsetof(private_proposal_substructure_t, spi) },
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/* Transforms are stored in a transform substructure,
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offset points to a linked_list_t pointer */
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{ TRANSFORMS, offsetof(private_proposal_substructure_t, transforms) }
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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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! 0 (last) or 2 ! RESERVED ! Proposal Length !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! Proposal # ! Protocol ID ! SPI Size !# of Transforms!
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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~ SPI (variable) ~
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! !
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~ <Transforms> ~
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! !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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/**
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* Implements payload_t's verify function.
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* See #payload_s.verify for description.
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*/
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static status_t verify(private_proposal_substructure_t *this)
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{
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if ((this->next_payload != NO_PAYLOAD) && (this->next_payload != PROPOSAL_SUBSTRUCTURE))
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{
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/* must be 0 or 2 */
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return FAILED;
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}
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if (this->transforms_count != this->transforms->get_count(this->transforms))
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{
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/* must be the same! */
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return FAILED;
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}
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if (this->protocol_id > 4)
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{
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/* reserved are not supported */
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return FAILED;
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}
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/* proposal number is checked in SA payload */
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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_proposal_substructure_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = proposal_substructure_encodings;
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*rule_count = sizeof(proposal_substructure_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_proposal_substructure_t *this)
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{
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return PROPOSAL_SUBSTRUCTURE;
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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_proposal_substructure_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_proposal_substructure_t *this,payload_type_t type)
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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_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_proposal_substructure_t *this)
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{
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return this->proposal_length;
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}
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/**
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* Implements proposal_substructure_t's create_transform_substructure_iterator function.
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* See #proposal_substructure_s.create_transform_substructure_iterator for description.
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*/
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static status_t create_transform_substructure_iterator (private_proposal_substructure_t *this,linked_list_iterator_t **iterator,bool forward)
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{
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return (this->transforms->create_iterator(this->transforms,iterator,forward));
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}
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/**
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* Implements proposal_substructure_t's add_transform_substructure function.
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* See #proposal_substructure_s.add_transform_substructure for description.
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*/
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static status_t add_transform_substructure (private_proposal_substructure_t *this,transform_substructure_t *transform)
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{
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status_t status;
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if (this->transforms->get_count(this->transforms) > 0)
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{
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transform_substructure_t *last_transform;
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status = this->transforms->get_last(this->transforms,(void **) &last_transform);
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/* last transform is now not anymore last one */
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last_transform->set_is_last_transform(last_transform,FALSE);
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}
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transform->set_is_last_transform(transform,TRUE);
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status = this->transforms->insert_last(this->transforms,(void *) transform);
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this->compute_length(this);
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return status;
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}
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/**
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* Implements proposal_substructure_t's set_proposal_number function.
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* See #proposal_substructure_s.set_proposal_number for description.
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*/
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static status_t set_proposal_number(private_proposal_substructure_t *this,u_int8_t proposal_number)
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{
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this->proposal_number = proposal_number;
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return SUCCESS;
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}
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/**
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* Implements proposal_substructure_t's get_proposal_number function.
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* See #proposal_substructure_s.get_proposal_number for description.
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*/
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static u_int8_t get_proposal_number (private_proposal_substructure_t *this)
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{
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return (this->proposal_number);
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}
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/**
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* Implements proposal_substructure_t's set_protocol_id function.
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* See #proposal_substructure_s.set_protocol_id for description.
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*/
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static status_t set_protocol_id(private_proposal_substructure_t *this,u_int8_t protocol_id)
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{
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this->protocol_id = protocol_id;
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return SUCCESS;
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}
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/**
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* Implements proposal_substructure_t's get_protocol_id function.
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* See #proposal_substructure_s.get_protocol_id for description.
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*/
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static u_int8_t get_protocol_id (private_proposal_substructure_t *this)
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{
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return (this->protocol_id);
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}
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/**
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* Implements proposal_substructure_t's set_spi function.
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* See #proposal_substructure_s.set_spi for description.
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*/
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static status_t set_spi (private_proposal_substructure_t *this, chunk_t spi)
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{
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/* first delete already set spi value */
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if (this->spi.ptr != NULL)
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{
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allocator_free(this->spi.ptr);
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this->spi.ptr = NULL;
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this->spi.len = 0;
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this->compute_length(this);
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}
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this->spi.ptr = allocator_clone_bytes(spi.ptr,spi.len);
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if (this->spi.ptr == NULL)
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{
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return OUT_OF_RES;
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}
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this->spi.len = spi.len;
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this->spi_size = spi.len;
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this->compute_length(this);
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return SUCCESS;
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}
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/**
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* Implements proposal_substructure_t's get_spi function.
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* See #proposal_substructure_s.get_spi for description.
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*/
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static chunk_t get_spi (private_proposal_substructure_t *this)
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{
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chunk_t spi;
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spi.ptr = this->spi.ptr;
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spi.len = this->spi.len;
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return spi;
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}
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/**
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* Implements private_proposal_substructure_t's compute_length function.
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* See #private_proposal_substructure_s.compute_length for description.
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*/
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static status_t compute_length (private_proposal_substructure_t *this)
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{
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linked_list_iterator_t *iterator;
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status_t status;
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size_t transforms_count = 0;
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size_t length = PROPOSAL_SUBSTRUCTURE_HEADER_LENGTH;
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status = this->transforms->create_iterator(this->transforms,&iterator,TRUE);
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if (status != SUCCESS)
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{
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return length;
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}
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while (iterator->has_next(iterator))
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{
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payload_t * current_transform;
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iterator->current(iterator,(void **) ¤t_transform);
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length += current_transform->get_length(current_transform);
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transforms_count++;
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}
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iterator->destroy(iterator);
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length += this->spi.len;
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this->transforms_count= transforms_count;
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this->proposal_length = length;
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return SUCCESS;
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}
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/**
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* Implements proposal_substructure_t's clone function.
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* See #proposal_substructure_s.clone for description.
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*/
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static status_t clone(private_proposal_substructure_t *this, private_proposal_substructure_t **clone)
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{
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private_proposal_substructure_t * new_clone;
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linked_list_iterator_t *transforms;
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status_t status;
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new_clone = (private_proposal_substructure_t *) proposal_substructure_create();
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new_clone->next_payload = this->next_payload;
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new_clone->proposal_number = this->proposal_number;
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new_clone->protocol_id = this->protocol_id;
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new_clone->spi_size = this->spi_size;
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if (this->spi.ptr != NULL)
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{
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new_clone->spi.ptr = allocator_clone_bytes(this->spi.ptr,this->spi.len);
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if (new_clone->spi.ptr == NULL)
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{
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new_clone->public.destroy(&(new_clone->public));
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return OUT_OF_RES;
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}
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new_clone->spi.len = this->spi.len;
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}
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status = this->transforms->create_iterator(this->transforms,&transforms,FALSE);
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if (status != SUCCESS)
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{
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new_clone->public.destroy(&(new_clone->public));
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return status;
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}
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while (transforms->has_next(transforms))
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{
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transform_substructure_t *current_transform;
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transform_substructure_t *current_transform_clone;
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status = transforms->current(transforms,(void **) ¤t_transform);
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if (status != SUCCESS)
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{
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transforms->destroy(transforms);
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new_clone->public.destroy(&(new_clone->public));
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return status;
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}
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status = current_transform->clone(current_transform,¤t_transform_clone);
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if (status != SUCCESS)
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{
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transforms->destroy(transforms);
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new_clone->public.destroy(&(new_clone->public));
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return status;
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}
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status = new_clone->public.add_transform_substructure(&(new_clone->public),current_transform_clone);
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if (status != SUCCESS)
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{
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transforms->destroy(transforms);
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current_transform_clone->destroy(current_transform_clone);
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new_clone->public.destroy(&(new_clone->public));
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return status;
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}
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}
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transforms->destroy(transforms);
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*clone = new_clone;
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return SUCCESS;
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}
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/**
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* Implements payload_t's and proposal_substructure_t's destroy function.
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* See #payload_s.destroy or proposal_substructure_s.destroy for description.
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*/
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static status_t destroy(private_proposal_substructure_t *this)
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{
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/* all proposals are getting destroyed */
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while (this->transforms->get_count(this->transforms) > 0)
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{
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transform_substructure_t *current_transform;
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if (this->transforms->remove_last(this->transforms,(void **)¤t_transform) != SUCCESS)
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{
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break;
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}
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current_transform->destroy(current_transform);
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}
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this->transforms->destroy(this->transforms);
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if (this->spi.ptr != NULL)
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{
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allocator_free(this->spi.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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* Described in header
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*/
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proposal_substructure_t *proposal_substructure_create()
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{
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private_proposal_substructure_t *this = allocator_alloc_thing(private_proposal_substructure_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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/* 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 = (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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/* public functions */
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this->public.create_transform_substructure_iterator = (status_t (*) (proposal_substructure_t *,linked_list_iterator_t **,bool)) create_transform_substructure_iterator;
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this->public.add_transform_substructure = (status_t (*) (proposal_substructure_t *,transform_substructure_t *)) add_transform_substructure;
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this->public.set_proposal_number = (status_t (*) (proposal_substructure_t *,u_int8_t))set_proposal_number;
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this->public.get_proposal_number = (u_int8_t (*) (proposal_substructure_t *)) get_proposal_number;
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this->public.set_protocol_id = (status_t (*) (proposal_substructure_t *,u_int8_t))set_protocol_id;
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this->public.get_protocol_id = (u_int8_t (*) (proposal_substructure_t *)) get_protocol_id;
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this->public.set_spi = (status_t (*) (proposal_substructure_t *,chunk_t))set_spi;
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this->public.get_spi = (chunk_t (*) (proposal_substructure_t *)) get_spi;
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this->public.clone = (status_t (*) (proposal_substructure_t *, proposal_substructure_t **)) clone;
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this->public.destroy = (status_t (*) (proposal_substructure_t *)) destroy;
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/* private functions */
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this->compute_length = compute_length;
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/* set default values of the fields */
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this->next_payload = NO_PAYLOAD;
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this->proposal_length = 0;
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this->proposal_number = 0;
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this->protocol_id = 0;
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this->transforms_count = 0;
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this->spi_size = 0;
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this->spi.ptr = NULL;
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this->spi.len = 0;
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this->transforms = linked_list_create();
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if (this->transforms == NULL)
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{
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allocator_free(this);
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|
return NULL;
|
|
}
|
|
return (&(this->public));
|
|
}
|