286 lines
6.8 KiB
C
286 lines
6.8 KiB
C
/*
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* Copyright (C) 2005-2010 Martin Willi
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* Copyright (C) 2010 revosec AG
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* Copyright (C) 2005 Jan Hutter
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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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* reserved bits
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*/
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bool reserved[7];
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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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static encoding_rule_t 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 */
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{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[0]) },
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{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[1]) },
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{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[2]) },
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{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[3]) },
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{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[4]) },
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{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[5]) },
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{ RESERVED_BIT, offsetof(private_delete_payload_t, reserved[6]) },
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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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{ CHUNK_DATA, 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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METHOD(payload_t, verify, status_t,
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private_delete_payload_t *this)
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{
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switch (this->protocol_id)
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{
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case PROTO_AH:
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case PROTO_ESP:
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if (this->spi_size != 4)
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{
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return FAILED;
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}
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break;
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case PROTO_IKE:
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case 0:
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/* IKE deletion has no spi assigned! */
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if (this->spi_size != 0)
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{
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return FAILED;
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}
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break;
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default:
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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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return SUCCESS;
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}
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METHOD(payload_t, get_encoding_rules, int,
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private_delete_payload_t *this, encoding_rule_t **rules)
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{
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*rules = encodings;
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return countof(encodings);
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}
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METHOD(payload_t, get_header_length, int,
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private_delete_payload_t *this)
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{
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return 8;
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}
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METHOD(payload_t, get_payload_type, payload_type_t,
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private_delete_payload_t *this)
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{
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return DELETE;
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}
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METHOD(payload_t, get_next_type, payload_type_t,
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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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METHOD(payload_t, set_next_type, void,
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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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METHOD(payload_t, get_length, size_t,
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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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METHOD(delete_payload_t, get_protocol_id, protocol_id_t,
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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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METHOD(delete_payload_t, add_spi, void,
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private_delete_payload_t *this, u_int32_t spi)
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{
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switch (this->protocol_id)
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{
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case PROTO_AH:
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case PROTO_ESP:
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this->spi_count++;
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this->payload_length += sizeof(spi);
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this->spis = chunk_cat("mc", this->spis, chunk_from_thing(spi));
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break;
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default:
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break;
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}
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}
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/**
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* SPI enumerator implementation
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*/
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typedef struct {
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/** implements enumerator_t */
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enumerator_t public;
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/** remaining SPIs */
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chunk_t spis;
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} spi_enumerator_t;
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METHOD(enumerator_t, spis_enumerate, bool,
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spi_enumerator_t *this, u_int32_t *spi)
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{
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if (this->spis.len >= sizeof(*spi))
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{
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memcpy(spi, this->spis.ptr, sizeof(*spi));
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this->spis = chunk_skip(this->spis, sizeof(*spi));
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return TRUE;
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}
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return FALSE;
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}
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METHOD(delete_payload_t, create_spi_enumerator, enumerator_t*,
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private_delete_payload_t *this)
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{
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spi_enumerator_t *e;
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if (this->spi_size != sizeof(u_int32_t))
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{
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return enumerator_create_empty();
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}
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INIT(e,
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.public = {
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.enumerate = (void*)_spis_enumerate,
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.destroy = (void*)free,
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},
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.spis = this->spis,
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);
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return &e->public;
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}
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METHOD2(payload_t, delete_payload_t, destroy, void,
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private_delete_payload_t *this)
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{
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free(this->spis.ptr);
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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(protocol_id_t protocol_id)
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{
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private_delete_payload_t *this;
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INIT(this,
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.public = {
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.payload_interface = {
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.verify = _verify,
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.get_encoding_rules = _get_encoding_rules,
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.get_header_length = _get_header_length,
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.get_length = _get_length,
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.get_next_type = _get_next_type,
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.set_next_type = _set_next_type,
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.get_type = _get_payload_type,
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.destroy = _destroy,
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},
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.get_protocol_id = _get_protocol_id,
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.add_spi = _add_spi,
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.create_spi_enumerator = _create_spi_enumerator,
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.destroy = _destroy,
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},
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.next_payload = NO_PAYLOAD,
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.payload_length = get_header_length(this),
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.protocol_id = protocol_id,
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.spi_size = protocol_id == PROTO_AH || protocol_id == PROTO_ESP ? 4 : 0,
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);
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return &this->public;
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}
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