323 lines
8.5 KiB
C
323 lines
8.5 KiB
C
/**
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* @file delete_payload.c
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*
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* @brief Implementation of delete_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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#include <stddef.h>
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#include "delete_payload.h"
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typedef struct private_delete_payload_t private_delete_payload_t;
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/**
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* Private data of an delete_payload_t object.
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*
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*/
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struct private_delete_payload_t {
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/**
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* Public delete_payload_t interface.
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*/
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delete_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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* 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.
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*/
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u_int8_t spi_size;
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/**
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* Number of SPI's.
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*/
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u_int16_t spi_count;
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/**
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* The contained SPI's.
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*/
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chunk_t spis;
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};
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/**
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* Encoding rules to parse or generate a DELETE 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_delete_payload_t.
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*
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*/
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encoding_rule_t delete_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_delete_payload_t, next_payload) },
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/* the critical bit */
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{ FLAG, offsetof(private_delete_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_delete_payload_t, payload_length)},
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{ U_INT_8, offsetof(private_delete_payload_t, protocol_id) },
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{ U_INT_8, offsetof(private_delete_payload_t, spi_size) },
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{ U_INT_16, offsetof(private_delete_payload_t, spi_count) },
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/* some delete data bytes, length is defined in PAYLOAD_LENGTH */
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{ SPIS, offsetof(private_delete_payload_t, spis) }
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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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! Protocol ID ! SPI Size ! # of SPIs !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! !
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~ Security Parameter Index(es) (SPI) ~
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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_delete_payload_t *this)
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{
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if ((this->protocol_id == 0) ||
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(this->protocol_id > 3))
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{
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/* reserved IDs */
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return FAILED;
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}
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if (this->spis.len != (this->spi_count * this->spi_size))
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{
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return FAILED;
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}
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if ((this->protocol_id == PROTO_IKE) && (this->spis.len != 0))
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{
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/* IKE deletion has no spi assigned! */
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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 delete_payload_t.get_encoding_rules.
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*/
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static void get_encoding_rules(private_delete_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = delete_payload_encodings;
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*rule_count = sizeof(delete_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_delete_payload_t *this)
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{
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return DELETE;
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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_delete_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_delete_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_delete_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 delete_payload_t.set_protocol_id.
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*/
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static void set_protocol_id (private_delete_payload_t *this, protocol_id_t protocol_id)
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{
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this->protocol_id = protocol_id;
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}
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/**
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* Implementation of delete_payload_t.get_protocol_id.
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*/
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static protocol_id_t get_protocol_id (private_delete_payload_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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* Implementation of delete_payload_t.set_spi_size.
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*/
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static void set_spi_size (private_delete_payload_t *this, u_int8_t spi_size)
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{
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this->spi_size = spi_size;
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}
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/**
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* Implementation of delete_payload_t.get_spi_size.
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*/
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static u_int8_t get_spi_size (private_delete_payload_t *this)
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{
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return (this->spi_size);
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}
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/**
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* Implementation of delete_payload_t.set_spi_count.
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*/
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static void set_spi_count (private_delete_payload_t *this, u_int16_t spi_count)
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{
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this->spi_count = spi_count;
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}
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/**
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* Implementation of delete_payload_t.get_spi_count.
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*/
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static u_int16_t get_spi_count (private_delete_payload_t *this)
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{
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return (this->spi_count);
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}
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/**
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* Implementation of delete_payload_t.set_spis.
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*/
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static void set_spis (private_delete_payload_t *this, chunk_t spis)
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{
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if (this->spis.ptr != NULL)
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{
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chunk_free(&(this->spis));
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}
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this->spis.ptr = clalloc(spis.ptr,spis.len);
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this->spis.len = spis.len;
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this->payload_length = DELETE_PAYLOAD_HEADER_LENGTH + this->spis.len;
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}
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/**
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* Implementation of delete_payload_t.get_spis.
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*/
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static chunk_t get_spis (private_delete_payload_t *this)
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{
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return (this->spis);
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}
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/**
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* Implementation of delete_payload_t.get_spis_clone.
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*/
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static chunk_t get_spis_clone (private_delete_payload_t *this)
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{
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chunk_t cloned_spis;
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if (this->spis.ptr == NULL)
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{
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return (this->spis);
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}
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cloned_spis.ptr = clalloc(this->spis.ptr,this->spis.len);
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cloned_spis.len = this->spis.len;
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return cloned_spis;
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}
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/**
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* Implementation of payload_t.destroy and delete_payload_t.destroy.
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*/
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static void destroy(private_delete_payload_t *this)
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{
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if (this->spis.ptr != NULL)
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{
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chunk_free(&(this->spis));
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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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delete_payload_t *delete_payload_create()
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{
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private_delete_payload_t *this = malloc_thing(private_delete_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 (*) (delete_payload_t *)) destroy;
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this->public.set_protocol_id = (void (*) (delete_payload_t *,protocol_id_t)) set_protocol_id;
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this->public.get_protocol_id = (protocol_id_t (*) (delete_payload_t *)) get_protocol_id;
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this->public.set_spi_size = (void (*) (delete_payload_t *,u_int8_t)) set_spi_size;
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this->public.get_spi_size = (u_int8_t (*) (delete_payload_t *)) get_spi_size;
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this->public.set_spi_count = (void (*) (delete_payload_t *,u_int16_t)) set_spi_count;
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this->public.get_spi_count = (u_int16_t (*) (delete_payload_t *)) get_spi_count;
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this->public.set_spis = (void (*) (delete_payload_t *,chunk_t)) set_spis;
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this->public.get_spis_clone = (chunk_t (*) (delete_payload_t *)) get_spis_clone;
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this->public.get_spis = (chunk_t (*) (delete_payload_t *)) get_spis;
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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 =DELETE_PAYLOAD_HEADER_LENGTH;
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this->protocol_id = PROTO_NONE;
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this->spi_size = 0;
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this->spi_count = 0;
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this->spis = CHUNK_INITIALIZER;
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return (&(this->public));
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}
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