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/*
* Copyright (C) 2005-2010 Martin Willi
* Copyright (C) 2010 revosec AG
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <stddef.h>
#include "configuration_attribute.h"
#include <encoding/payloads/encodings.h>
#include <library.h>
#include <daemon.h>
typedef struct private_configuration_attribute_t private_configuration_attribute_t;
/**
* Private data of an configuration_attribute_t object.
*/
struct private_configuration_attribute_t {
/**
* Public configuration_attribute_t interface.
*/
configuration_attribute_t public;
/**
* Reserved bit
*/
bool reserved;
/**
* Type of the attribute.
*/
u_int16_t type;
/**
* Length of the attribute.
*/
u_int16_t length;
/**
* Attribute value as chunk.
*/
chunk_t value;
};
/**
* Encoding rules to parse or generate a configuration attribute.
*
* The defined offsets are the positions in a object of type
* private_configuration_attribute_t.
*/
encoding_rule_t configuration_attribute_encodings[] = {
/* 1 reserved bit */
{ RESERVED_BIT, offsetof(private_configuration_attribute_t, reserved)},
/* type of the attribute as 15 bit unsigned integer */
{ ATTRIBUTE_TYPE, offsetof(private_configuration_attribute_t, type) },
/* Length of attribute value */
{ CONFIGURATION_ATTRIBUTE_LENGTH, offsetof(private_configuration_attribute_t, length) },
/* Value of attribute if attribute format flag is zero */
{ CONFIGURATION_ATTRIBUTE_VALUE, offsetof(private_configuration_attribute_t, value) }
};
/*
1 2 3
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
!R| Attribute Type ! Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
~ Value ~
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
METHOD(payload_t, verify, status_t,
private_configuration_attribute_t *this)
{
bool failed = FALSE;
if (this->length != this->value.len)
{
DBG1(DBG_ENC, "invalid attribute length");
return FAILED;
}
switch (this->type)
{
case INTERNAL_IP4_ADDRESS:
case INTERNAL_IP4_NETMASK:
case INTERNAL_IP4_DNS:
case INTERNAL_IP4_NBNS:
case INTERNAL_ADDRESS_EXPIRY:
case INTERNAL_IP4_DHCP:
if (this->length != 0 && this->length != 4)
{
failed = TRUE;
}
break;
case INTERNAL_IP4_SUBNET:
if (this->length != 0 && this->length != 8)
{
failed = TRUE;
}
break;
case INTERNAL_IP6_ADDRESS:
case INTERNAL_IP6_SUBNET:
if (this->length != 0 && this->length != 17)
{
failed = TRUE;
}
break;
case INTERNAL_IP6_DNS:
case INTERNAL_IP6_NBNS:
case INTERNAL_IP6_DHCP:
if (this->length != 0 && this->length != 16)
{
failed = TRUE;
}
break;
case SUPPORTED_ATTRIBUTES:
if (this->length % 2)
{
failed = TRUE;
}
break;
case APPLICATION_VERSION:
/* any length acceptable */
break;
default:
DBG1(DBG_ENC, "unknown attribute type %N",
configuration_attribute_type_names, this->type);
break;
}
if (failed)
{
DBG1(DBG_ENC, "invalid attribute length %d for %N",
this->length, configuration_attribute_type_names, this->type);
return FAILED;
}
return SUCCESS;
}
METHOD(payload_t, get_encoding_rules, void,
private_configuration_attribute_t *this, encoding_rule_t **rules,
size_t *rule_count)
{
*rules = configuration_attribute_encodings;
*rule_count = countof(configuration_attribute_encodings);
}
METHOD(payload_t, get_type, payload_type_t,
private_configuration_attribute_t *this)
{
return CONFIGURATION_ATTRIBUTE;
}
METHOD(payload_t, get_next_type, payload_type_t,
private_configuration_attribute_t *this)
{
return NO_PAYLOAD;
}
METHOD(payload_t, set_next_type, void,
private_configuration_attribute_t *this, payload_type_t type)
{
}
METHOD(payload_t, get_length, size_t,
private_configuration_attribute_t *this)
{
return this->value.len + CONFIGURATION_ATTRIBUTE_HEADER_LENGTH;
}
METHOD(configuration_attribute_t, get_cattr_type, configuration_attribute_type_t,
private_configuration_attribute_t *this)
{
return this->type;
}
METHOD(configuration_attribute_t, get_value, chunk_t,
private_configuration_attribute_t *this)
{
return this->value;
}
METHOD2(payload_t, configuration_attribute_t, destroy, void,
private_configuration_attribute_t *this)
{
free(this->value.ptr);
free(this);
}
/*
* Described in header.
*/
configuration_attribute_t *configuration_attribute_create()
{
private_configuration_attribute_t *this;
INIT(this,
.public = {
.payload_interface = {
.verify = _verify,
.get_encoding_rules = _get_encoding_rules,
.get_length = _get_length,
.get_next_type = _get_next_type,
.set_next_type = _set_next_type,
.get_type = _get_type,
.destroy = _destroy,
},
.get_value = _get_value,
.get_type = _get_cattr_type,
.destroy = _destroy,
},
);
return &this->public;
}
/*
* Described in header.
*/
configuration_attribute_t *configuration_attribute_create_value(
configuration_attribute_type_t type, chunk_t value)
{
private_configuration_attribute_t *this;
this = (private_configuration_attribute_t*)configuration_attribute_create();
this->type = ((u_int16_t)type) & 0x7FFF;
this->value = chunk_clone(value);
this->length = value.len;
return &this->public;
}
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