314 lines
8.6 KiB
C
314 lines
8.6 KiB
C
/**
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* @file cp_payload.c
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*
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* @brief Implementation of cp_payload_t.
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*
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*/
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/*
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* Copyright (C) 2005 Jan Hutter, Martin Willi
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* Hochschule fuer Technik Rapperswil
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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/* offsetof macro */
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#include <stddef.h>
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#include "cp_payload.h"
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#include <encoding/payloads/encodings.h>
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#include <utils/allocator.h>
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#include <utils/linked_list.h>
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/**
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* String mappings for config_type_t.
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*/
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mapping_t config_type_m[] = {
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{CFG_REQUEST, "CFG_REQUEST"},
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{CFG_REPLY, "CFG_REPLY"},
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{CFG_SET, "CFG_SET"},
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{CFG_ACK, "CFG_ACK"},
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{MAPPING_END, NULL}
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};
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typedef struct private_cp_payload_t private_cp_payload_t;
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/**
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* Private data of an cp_payload_t object.
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*
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*/
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struct private_cp_payload_t {
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/**
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* Public cp_payload_t interface.
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*/
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cp_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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* Configuration Attributes in this payload are stored in a linked_list_t.
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*/
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linked_list_t * attributes;
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/**
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* Config Type.
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*/
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u_int8_t config_type;
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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_cp_payload_t object
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*/
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void (*compute_length) (private_cp_payload_t *this);
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};
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/**
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* Encoding rules to parse or generate a IKEv2-CP 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_cp_payload_t.
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*
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*/
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encoding_rule_t cp_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_cp_payload_t, next_payload) },
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/* the critical bit */
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{ FLAG, offsetof(private_cp_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 CP payload*/
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{ PAYLOAD_LENGTH, offsetof(private_cp_payload_t, payload_length) },
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/* Proposals are stored in a proposal substructure,
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offset points to a linked_list_t pointer */
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{ U_INT_8, offsetof(private_cp_payload_t, config_type) },
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{ RESERVED_BYTE,0 },
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{ RESERVED_BYTE,0 },
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{ RESERVED_BYTE,0 },
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{ CONFIGURATION_ATTRIBUTES, offsetof(private_cp_payload_t, attributes) }
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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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! CFG Type ! RESERVED !
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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! !
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~ Configuration Attributes ~
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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_cp_payload_t *this)
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{
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status_t status = SUCCESS;
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iterator_t *iterator;
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if (this->critical)
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{
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/* critical bit set! */
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return FAILED;
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}
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iterator = this->attributes->create_iterator(this->attributes,TRUE);
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while(iterator->has_next(iterator))
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{
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configuration_attribute_t *attribute;
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iterator->current(iterator,(void **)&attribute);
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status = attribute->payload_interface.verify(&(attribute->payload_interface));
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if (status != SUCCESS)
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{
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break;
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}
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}
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iterator->destroy(iterator);
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return status;
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}
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/**
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* Implementation of payload_t.get_encoding_rules.
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*/
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static void get_encoding_rules(private_cp_payload_t *this, encoding_rule_t **rules, size_t *rule_count)
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{
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*rules = cp_payload_encodings;
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*rule_count = sizeof(cp_payload_encodings) / sizeof(encoding_rule_t);
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}
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/**
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* Implementation of payload_t.get_type.
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*/
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static payload_type_t get_type(private_cp_payload_t *this)
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{
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return CONFIGURATION;
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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_cp_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_cp_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_cp_payload_t *this)
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{
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this->compute_length(this);
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return this->payload_length;
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}
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/**
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* Implementation of cp_payload_t.create_configuration_attribute_iterator.
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*/
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static iterator_t *create_configuration_attribute_iterator (private_cp_payload_t *this,bool forward)
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{
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return this->attributes->create_iterator(this->attributes,forward);
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}
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/**
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* Implementation of cp_payload_t.add_proposal_substructure.
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*/
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static void add_configuration_attribute (private_cp_payload_t *this,configuration_attribute_t *attribute)
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{
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this->attributes->insert_last(this->attributes,(void *) attribute);
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this->compute_length(this);
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}
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/**
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* Implementation of cp_payload_t.set_config_type.
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*/
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static void set_config_type (private_cp_payload_t *this,config_type_t config_type)
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{
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this->config_type = config_type;
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}
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/**
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* Implementation of cp_payload_t.get_config_type.
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*/
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static config_type_t get_config_type (private_cp_payload_t *this)
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{
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return this->config_type;
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}
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/**
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* Implementation of private_cp_payload_t.compute_length.
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*/
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static void compute_length (private_cp_payload_t *this)
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{
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iterator_t *iterator;
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size_t length = CP_PAYLOAD_HEADER_LENGTH;
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iterator = this->attributes->create_iterator(this->attributes,TRUE);
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while (iterator->has_next(iterator))
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{
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payload_t *current_attribute;
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iterator->current(iterator,(void **) ¤t_attribute);
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length += current_attribute->get_length(current_attribute);
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}
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iterator->destroy(iterator);
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this->payload_length = length;
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}
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/**
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* Implementation of payload_t.destroy and cp_payload_t.destroy.
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*/
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static status_t destroy(private_cp_payload_t *this)
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{
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/* all attributes are getting destroyed */
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while (this->attributes->get_count(this->attributes) > 0)
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{
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configuration_attribute_t *current_attribute;
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this->attributes->remove_last(this->attributes,(void **)¤t_attribute);
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current_attribute->destroy(current_attribute);
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}
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this->attributes->destroy(this->attributes);
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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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cp_payload_t *cp_payload_create()
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{
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private_cp_payload_t *this = allocator_alloc_thing(private_cp_payload_t);
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/* public interface */
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this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
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this->public.payload_interface.get_encoding_rules = (void (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
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this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
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this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
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this->public.payload_interface.set_next_type = (void (*) (payload_t *,payload_type_t)) set_next_type;
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this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type;
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this->public.payload_interface.destroy = (void (*) (payload_t *))destroy;
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/* public functions */
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this->public.create_configuration_attribute_iterator = (iterator_t* (*) (cp_payload_t *,bool)) create_configuration_attribute_iterator;
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this->public.add_configuration_attribute = (void (*) (cp_payload_t *,configuration_attribute_t *)) add_configuration_attribute;
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this->public.set_config_type = (void (*) (cp_payload_t *, config_type_t)) set_config_type;
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this->public.get_config_type = (config_type_t (*) (cp_payload_t *)) get_config_type;
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this->public.destroy = (void (*) (cp_payload_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->critical = FALSE;
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this->next_payload = NO_PAYLOAD;
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this->payload_length = CP_PAYLOAD_HEADER_LENGTH;
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this->attributes = linked_list_create();
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return (&(this->public));
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}
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