- created encoding package

1 files changed, 363 insertions, 0 deletions

diff --git a/Source/charon/encoding/payloads/transform_attribute.c b/Source/charon/encoding/payloads/transform_attribute.c
new file mode 100644
index 000000000..9aed1e332
--- /dev/null
+++ b/Source/charon/encoding/payloads/transform_attribute.c
@@ -0,0 +1,363 @@
+/**
+ * @file transform_attribute.c
+ * 
+ * @brief Declaration of the class transform_attribute_t. 
+ * 
+ * An object of this type represents an IKEv2 TRANSFORM attribute.
+ * 
+ */
+
+/*
+ * Copyright (C) 2005 Jan Hutter, Martin Willi
+ * 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.
+ */
+ 
+/* offsetof macro */
+#include <stddef.h>
+
+#include "transform_attribute.h"
+
+#include <encoding/payloads/encodings.h>
+#include <types.h>
+#include <utils/allocator.h>
+
+/**
+ * Private data of an transform_attribute_t Object
+ * 
+ */
+typedef struct private_transform_attribute_s private_transform_attribute_t;
+
+struct private_transform_attribute_s {
+	/**
+	 * public transform_attribute_t interface
+	 */
+	transform_attribute_t public;
+	
+	/**
+	 * Attribute Format Flag
+	 * 
+	 * - TRUE means value is stored in attribute_length_or_value
+	 * - FALSE means value is stored in attribute_value
+	 */
+	bool attribute_format;
+	
+	/**
+	 * Type of the attribute
+	 */
+	u_int16_t attribute_type;
+	
+	/**
+	 * Attribute Length if attribute_format is 0, attribute Value otherwise
+	 */
+	u_int16_t attribute_length_or_value;
+	
+	/**
+	 * Attribute value as chunk if attribute_format is 0 (FALSE)
+	 */
+	chunk_t attribute_value;
+};
+
+
+
+/** 
+ * string mappings for transform_attribute_type_t
+ */
+mapping_t transform_attribute_type_m[] = {
+	{ATTRIBUTE_UNDEFINED, "ATTRIBUTE_UNDEFINED"},
+	{KEY_LENGTH, "KEY_LENGTH"},
+	{MAPPING_END, NULL}
+};
+
+/**
+ * Encoding rules to parse or generate a Transform attribute
+ * 
+ * The defined offsets are the positions in a object of type 
+ * private_transform_attribute_t.
+ * 
+ */
+encoding_rule_t transform_attribute_encodings[] = {
+	/* Flag defining the format of this payload */
+	{ ATTRIBUTE_FORMAT,			offsetof(private_transform_attribute_t, attribute_format) 			},
+	/* type of the attribute as 15 bit unsigned integer */
+	{ ATTRIBUTE_TYPE,			offsetof(private_transform_attribute_t, attribute_type)				},	
+	/* Length or value, depending on the attribute format flag */
+	{ ATTRIBUTE_LENGTH_OR_VALUE,	offsetof(private_transform_attribute_t, attribute_length_or_value)	},
+	/* Value of attribute if attribute format flag is zero */
+	{ ATTRIBUTE_VALUE,			offsetof(private_transform_attribute_t, attribute_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
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      !A!       Attribute Type        !    AF=0  Attribute Length     !
+      !F!                             !    AF=1  Attribute Value      !
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+      !                   AF=0  Attribute Value                       !
+      !                   AF=1  Not Transmitted                       !
+      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+*/
+
+/**
+ * Implements payload_t's verify function.
+ * See #payload_s.verify for description.
+ */
+static status_t verify(private_transform_attribute_t *this)
+{
+	if (this->attribute_type != KEY_LENGTH)
+	{
+		return FAILED;
+	}
+	
+	return SUCCESS;
+}
+
+/**
+ * Implements payload_t's get_encoding_rules function.
+ * See #payload_s.get_encoding_rules for description.
+ */
+static status_t get_encoding_rules(private_transform_attribute_t *this, encoding_rule_t **rules, size_t *rule_count)
+{
+	*rules = transform_attribute_encodings;
+	*rule_count = sizeof(transform_attribute_encodings) / sizeof(encoding_rule_t);
+	
+	return SUCCESS;
+}
+
+/**
+ * Implements payload_t's get_type function.
+ * See #payload_s.get_type for description.
+ */
+static payload_type_t get_type(private_transform_attribute_t *this)
+{
+	return TRANSFORM_ATTRIBUTE;
+}
+
+/**
+ * Implements payload_t's get_next_type function.
+ * See #payload_s.get_next_type for description.
+ */
+static payload_type_t get_next_type(private_transform_attribute_t *this)
+{
+	return (NO_PAYLOAD);
+}
+
+/**
+ * Implements payload_t's set_next_type function.
+ * See #payload_s.set_next_type for description.
+ */
+static status_t set_next_type(private_transform_attribute_t *this,payload_type_t type)
+{
+	return SUCCESS;
+}
+
+/**
+ * Implements payload_t's get_length function.
+ * See #payload_s.get_length for description.
+ */
+static size_t get_length(private_transform_attribute_t *this)
+{
+	if (this->attribute_format == TRUE)
+	{
+		/*Attribute size is only 4 byte */
+		return 4;
+	}
+	return (this->attribute_length_or_value + 4);
+}
+/**
+ * Implements transform_attribute_t's set_value function.
+ * See #transform_attribute_s.set_value for description.
+ */
+static status_t set_value_chunk(private_transform_attribute_t *this, chunk_t value)
+{
+	if (this->attribute_value.ptr != NULL)
+	{
+		/* free existing value */
+		allocator_free(this->attribute_value.ptr);
+		this->attribute_value.ptr = NULL;
+		this->attribute_value.len = 0;
+		
+	}
+	
+	if (value.len > 2)
+	{
+		this->attribute_value.ptr = allocator_clone_bytes(value.ptr,value.len);
+		if (this->attribute_value.ptr == NULL)
+		{
+			return OUT_OF_RES;
+		}
+		this->attribute_value.len = value.len;
+		this->attribute_length_or_value = value.len;
+		/* attribute has not a fixed length */
+		this->attribute_format = FALSE;		
+	}
+	else
+	{
+		memcpy(&(this->attribute_length_or_value),value.ptr,value.len);
+	}
+	return SUCCESS;
+}
+
+/**
+ * Implements transform_attribute_t's set_value function.
+ * See #transform_attribute_s.set_value for description.
+ */
+static status_t set_value(private_transform_attribute_t *this, u_int16_t value)
+{
+	if (this->attribute_value.ptr != NULL)
+	{
+		/* free existing value */
+		allocator_free(this->attribute_value.ptr);
+		this->attribute_value.ptr = NULL;
+		this->attribute_value.len = 0;
+		
+	}
+	this->attribute_length_or_value = value;
+	return SUCCESS;
+}
+
+/**
+ * Implements transform_attribute_t's get_value_chunk function.
+ * See #transform_attribute_s.get_value_chunk for description.
+ */
+static chunk_t get_value_chunk (private_transform_attribute_t *this)
+{
+	chunk_t value;
+
+	if (this->attribute_format == FALSE)
+	{
+		value.ptr = this->attribute_value.ptr;
+		value.len = this->attribute_value.len;		
+	}
+	else
+	{
+		value.ptr = (void *) &(this->attribute_length_or_value);
+		value.len = 2;
+	}
+	
+	return value;
+}
+
+/**
+ * Implements transform_attribute_t's get_value function.
+ * See #transform_attribute_s.get_value for description.
+ */
+static u_int16_t get_value (private_transform_attribute_t *this)
+{
+	return this->attribute_length_or_value;
+}
+
+
+/**
+ * Implements transform_attribute_t's set_attribute_type function.
+ * See #transform_attribute_s.set_attribute_type for description.
+ */
+static status_t set_attribute_type (private_transform_attribute_t *this, u_int16_t type)
+{
+	this->attribute_type = type & 0x7FFF;
+	return SUCCESS;
+}
+
+/**
+ * Implements transform_attribute_t's get_attribute_type function.
+ * See #transform_attribute_s.get_attribute_type for description.
+ */
+static u_int16_t get_attribute_type (private_transform_attribute_t *this)
+{
+	return this->attribute_type;
+}
+
+/**
+ * Implements transform_attribute_t's clone function.
+ * See transform_attribute_s.clone for description.
+ */
+static status_t clone(private_transform_attribute_t *this,transform_attribute_t **clone)
+{
+	private_transform_attribute_t *new_clone;
+	
+	new_clone = (private_transform_attribute_t *) transform_attribute_create();
+	
+	new_clone->attribute_format = this->attribute_format;
+	new_clone->attribute_type = this->attribute_type;
+	new_clone->attribute_length_or_value = this->attribute_length_or_value;
+	
+	if (!new_clone->attribute_format)
+	{
+		new_clone->attribute_value.ptr = allocator_clone_bytes(this->attribute_value.ptr,this->attribute_value.len);		
+		new_clone->attribute_value.len = this->attribute_value.len;
+		if (new_clone->attribute_value.ptr == NULL)
+		{
+			new_clone->public.destroy(&(new_clone->public));
+			return OUT_OF_RES;
+		}
+	}
+	
+	*clone = (transform_attribute_t *) new_clone;
+	return SUCCESS;
+}
+
+/**
+ * Implements payload_t's and transform_attribute_t's destroy function.
+ * See #payload_s.destroy or transform_attribute_s.destroy for description.
+ */
+static status_t destroy(private_transform_attribute_t *this)
+{
+	if (this->attribute_value.ptr != NULL)
+	{
+		allocator_free(this->attribute_value.ptr);
+	}	
+	allocator_free(this);
+	
+	return SUCCESS;
+}
+
+/*
+ * Described in header
+ */
+transform_attribute_t *transform_attribute_create()
+{
+	private_transform_attribute_t *this = allocator_alloc_thing(private_transform_attribute_t);
+	if (this == NULL)
+	{
+		return NULL;	
+	}	
+	
+	/* payload interface */
+	this->public.payload_interface.verify = (status_t (*) (payload_t *))verify;
+	this->public.payload_interface.get_encoding_rules = (status_t (*) (payload_t *, encoding_rule_t **, size_t *) ) get_encoding_rules;
+	this->public.payload_interface.get_length = (size_t (*) (payload_t *)) get_length;
+	this->public.payload_interface.get_next_type = (payload_type_t (*) (payload_t *)) get_next_type;
+	this->public.payload_interface.set_next_type = (status_t (*) (payload_t *,payload_type_t)) set_next_type;
+	this->public.payload_interface.get_type = (payload_type_t (*) (payload_t *)) get_type;
+	this->public.payload_interface.destroy = (status_t (*) (payload_t *))destroy;
+	
+	/* public functions */
+	this->public.set_value_chunk = (status_t (*) (transform_attribute_t *,chunk_t)) set_value_chunk;
+	this->public.set_value = (status_t (*) (transform_attribute_t *,u_int16_t)) set_value;
+	this->public.get_value_chunk = (chunk_t (*) (transform_attribute_t *)) get_value_chunk;
+	this->public.get_value = (u_int16_t (*) (transform_attribute_t *)) get_value;
+	this->public.set_attribute_type = (status_t (*) (transform_attribute_t *,u_int16_t type)) set_attribute_type;
+	this->public.get_attribute_type = (u_int16_t (*) (transform_attribute_t *)) get_attribute_type;
+	this->public.clone = (status_t (*) (transform_attribute_t *,transform_attribute_t **)) clone;
+	this->public.destroy = (status_t (*) (transform_attribute_t *)) destroy;
+	
+	/* set default values of the fields */
+	this->attribute_format = TRUE;
+	this->attribute_type = 0;
+	this->attribute_length_or_value = 0;
+	this->attribute_value.ptr = NULL;
+	this->attribute_value.len = 0;
+
+	return (&(this->public));
+}
+