1127 lines
34 KiB
C
1127 lines
34 KiB
C
/**
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* @file generator.c
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*
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* @brief Generic generator class used to generate IKEv2-header and payloads.
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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 <stdlib.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include "generator.h"
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#include <types.h>
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#include <globals.h>
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#include <utils/allocator.h>
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#include <utils/linked_list.h>
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#include <utils/logger_manager.h>
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#include <encoding/payloads/payload.h>
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#include <encoding/payloads/proposal_substructure.h>
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#include <encoding/payloads/transform_substructure.h>
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#include <encoding/payloads/sa_payload.h>
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#include <encoding/payloads/ke_payload.h>
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#include <encoding/payloads/notify_payload.h>
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#include <encoding/payloads/nonce_payload.h>
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typedef struct private_generator_t private_generator_t;
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/**
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* Private part of a generator_t object
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*/
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struct private_generator_t {
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/**
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* Public part of a generator_t object
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*/
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generator_t public;
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/* private functions and fields */
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/**
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* Generates a U_INT-Field type and writes it to buffer.
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*
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* @param this private_generator_t object
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* @param int_type type of U_INT field (U_INT_4, U_INT_8, etc.)
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* ATTRIBUTE_TYPE is also generated in this function
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* @param offset offset of value in data struct
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* @param generator_contexts generator_contexts_t object where the context is written or read from
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* @return - SUCCESS if succeeded
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* - OUT_OF_RES if out of ressources
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*/
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status_t (*generate_u_int_type) (private_generator_t *this,encoding_type_t int_type,u_int32_t offset);
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/**
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* Get size of current buffer in bytes.
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*
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* @param this private_generator_t object
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* @return Size of buffer in bytes
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*/
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size_t (*get_current_buffer_size) (private_generator_t *this);
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/**
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* Get free space of current buffer in bytes.
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*
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* @param this private_generator_t object
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* @return space in buffer in bytes
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*/
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size_t (*get_current_buffer_space) (private_generator_t *this);
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/**
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* Get length of data in buffer (in bytes).
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*
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* @param this private_generator_t object
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* @return length of data in bytes
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*/
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size_t (*get_current_data_length) (private_generator_t *this);
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/**
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* Get current offset in buffer (in bytes).
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*
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* @param this private_generator_t object
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* @return offset in bytes
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*/
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u_int32_t (*get_current_buffer_offset) (private_generator_t *this);
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/**
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* Generates a RESERVED BIT field or a RESERVED BYTE field and writes
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* it to the buffer.
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*
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* @param this private_generator_t object
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* @param generator_contexts generator_contexts_t object where the context is written or read from
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* @param bits number of bits to generate
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* @return - SUCCESS if succeeded
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* - OUT_OF_RES if out of ressources
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* - FAILED if bit count not supported
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*/
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status_t (*generate_reserved_field) (private_generator_t *this,int bits);
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/**
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* Generates a FLAG field
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*
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* @param this private_generator_t object
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* @param generator_contexts generator_contexts_t object where the context is written or read from
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* @param offset offset of flag value in data struct
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* @return - SUCCESS if succeeded
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* - OUT_OF_RES if out of ressources
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*/
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status_t (*generate_flag) (private_generator_t *this,u_int32_t offset);
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/**
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* Writes the current buffer content into a chunk_t
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*
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* Memory of specific chunk_t gets allocated.
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*
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* @param this calling private_generator_t object
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* @param data pointer of chunk_t to write to
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* @return
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* - SUCCESSFUL if succeeded
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* - OUT_OF_RES otherwise
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*/
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status_t (*write_chunk) (private_generator_t *this,chunk_t *data);
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/**
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* Generates a bytestream from a chunk_t
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*
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* @param this private_generator_t object
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* @param offset offset of chunk_t value in data struct
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* @return - SUCCESS if succeeded
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* - OUT_OF_RES if out of ressources
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*/
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status_t (*generate_from_chunk) (private_generator_t *this,u_int32_t offset);
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/**
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* Makes sure enough space is available in buffer to store amount of bits.
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*
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* If buffer is to small to hold the specific amount of bits it
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* is increased using reallocation function of allocator.
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*
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* @param this calling private_generator_t object
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* @param bits number of bits to make available in buffer
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* @return
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* - SUCCESSFUL if succeeded
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* - OUT_OF_RES otherwise
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*/
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status_t (*make_space_available) (private_generator_t *this,size_t bits);
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/**
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* Writes a specific amount of byte into the buffer.
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*
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* If buffer is to small to hold the specific amount of bytes it
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* is increased.
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*
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* @param this calling private_generator_t object
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* @param bytes pointer to bytes to write
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* @param number_of_bytes number of bytes to write into buffer
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* @return
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* - SUCCESSFUL if succeeded
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* - OUT_OF_RES otherwise
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*/
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status_t (*write_bytes_to_buffer) (private_generator_t *this,void * bytes,size_t number_of_bytes);
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/**
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* Writes a specific amount of byte into the buffer at a specific offset.
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*
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* @warning buffer size is not check to hold the data if offset is to large.
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*
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* @param this calling private_generator_t object
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* @param bytes pointer to bytes to write
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* @param number_of_bytes number of bytes to write into buffer
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* @param offset offset to write the data into
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* @return
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* - SUCCESSFUL if succeeded
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* - OUT_OF_RES otherwise
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*/
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status_t (*write_bytes_to_buffer_at_offset) (private_generator_t *this,void * bytes,size_t number_of_bytes,u_int32_t offset);
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/**
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* Buffer used to generate the data into.
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*/
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u_int8_t *buffer;
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/**
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* Current write position in buffer (one byte aligned).
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*/
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u_int8_t *out_position;
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/**
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* Position of last byte in buffer.
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*/
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u_int8_t *roof_position;
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/**
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* Current bit writing to in current byte (between 0 and 7).
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*/
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size_t current_bit;
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/**
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* Associated data struct to read informations from.
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*/
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void * data_struct;
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/*
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* Last payload length position offset in the buffer
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*/
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u_int32_t last_payload_length_position_offset;
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/**
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* Offset of the header length field in the buffer
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*/
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u_int32_t header_length_position_offset;
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/**
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* Last SPI size
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*/
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u_int8_t last_spi_size;
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/*
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* Attribute format of the last generated transform attribute
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*
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* Used to check if a variable value field is used or not for
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* the transform attribute value.
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*/
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bool attribute_format;
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/*
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* Depending on the value of attribute_format this field is used
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* to hold the length of the transform attribute in bytes
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*/
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u_int16_t attribute_length;
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/**
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* Associated Logger
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*/
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logger_t *logger;
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};
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/**
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* Implements private_generator_t's get_current_buffer_size function.
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* See #private_generator_s.get_current_buffer_size.
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*/
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static size_t get_current_buffer_size (private_generator_t *this)
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{
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return ((this->roof_position) - (this->buffer));
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}
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/**
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* Implements private_generator_t's get_current_buffer_space function.
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* See #private_generator_s.get_current_buffer_space.
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*/
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static size_t get_current_buffer_space (private_generator_t *this)
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{
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/* we know, one byte more */
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size_t space = (this->roof_position) - (this->out_position);
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return (space);
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}
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/**
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* Implements private_generator_t's get_current_buffer_space function.
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* See #private_generator_s.get_current_buffer_space.
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*/
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static size_t get_current_data_length (private_generator_t *this)
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{
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return (this->out_position - this->buffer);
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}
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/**
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* Implements private_generator_t's get_current_buffer_offset function.
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* See #private_generator_s.get_current_buffer_offset.
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*/
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static u_int32_t get_current_buffer_offset (private_generator_t *this)
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{
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return (this->out_position - this->buffer);
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}
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/**
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* Implements private_generator_t's generate_u_int_type function.
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* See #private_generator_s.generate_u_int_type.
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*/
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static status_t generate_u_int_type (private_generator_t *this,encoding_type_t int_type,u_int32_t offset)
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{
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size_t number_of_bits = 0;
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status_t status;
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/* find out number of bits of each U_INT type to check for enough space
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in buffer */
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switch (int_type)
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{
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case U_INT_4:
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number_of_bits = 4;
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break;
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case U_INT_8:
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number_of_bits = 8;
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break;
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case U_INT_16:
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number_of_bits = 16;
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break;
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case U_INT_32:
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number_of_bits = 32;
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break;
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case U_INT_64:
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number_of_bits = 64;
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break;
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case ATTRIBUTE_TYPE:
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number_of_bits = 15;
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break;
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case IKE_SPI:
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number_of_bits = 64;
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break;
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default:
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return FAILED;
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}
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/* U_INT Types of multiple then 8 bits must be aligned */
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if (((number_of_bits % 8) == 0) && (this->current_bit != 0))
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{
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this->logger->log(this->logger, ERROR, "U_INT Type %s is not 8 Bit aligned",
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mapping_find(encoding_type_m,int_type));
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/* current bit has to be zero for values multiple of 8 bits */
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return FAILED;
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}
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/* make sure enough space is available in buffer */
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status = this->make_space_available(this,number_of_bits);
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if (status != SUCCESS)
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{
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return status;
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}
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/* now handle each u int type differently */
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switch (int_type)
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{
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case U_INT_4:
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{
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if (this->current_bit == 0)
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{
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/* highval of current byte in buffer has to be set to the new value*/
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u_int8_t high_val = *((u_int8_t *)(this->data_struct + offset)) << 4;
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/* lowval in buffer is not changed */
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u_int8_t low_val = *(this->out_position) & 0x0F;
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/* highval is set, low_val is not changed */
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*(this->out_position) = high_val | low_val;
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this->logger->log(this->logger, RAW|MOST, " => 0x%x", *(this->out_position));
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/* write position is not changed, just bit position is moved */
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this->current_bit = 4;
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}
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else if (this->current_bit == 4)
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{
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/* highval in buffer is not changed */
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u_int high_val = *(this->out_position) & 0xF0;
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/* lowval of current byte in buffer has to be set to the new value*/
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u_int low_val = *((u_int8_t *)(this->data_struct + offset)) & 0x0F;
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*(this->out_position) = high_val | low_val;
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this->logger->log(this->logger, RAW|MOST, " => 0x%x", *(this->out_position));
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this->out_position++;
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this->current_bit = 0;
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}
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else
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{
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this->logger->log(this->logger, ERROR, "U_INT_4 Type is not 4 Bit aligned");
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/* 4 Bit integers must have a 4 bit alignment */
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return FAILED;
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};
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break;
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}
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case U_INT_8:
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{
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/* 8 bit values are written as they are */
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*this->out_position = *((u_int8_t *)(this->data_struct + offset));
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this->logger->log(this->logger, RAW|MOST, " => 0x%x", *(this->out_position));
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this->out_position++;
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break;
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}
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case ATTRIBUTE_TYPE:
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{
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/* attribute type must not change first bit uf current byte ! */
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if (this->current_bit != 1)
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{
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this->logger->log(this->logger, ERROR, "ATTRIBUTE FORMAT flag is not set");
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/* first bit has to be set! */
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return FAILED;
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}
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/* get value of attribute format flag */
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u_int8_t attribute_format_flag = *(this->out_position) & 0x80;
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/* get attribute type value as 16 bit integer*/
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u_int16_t int16_val = htons(*((u_int16_t*)(this->data_struct + offset)));
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/* last bit must be unset */
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int16_val = int16_val & 0xFF7F;
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int16_val = int16_val | attribute_format_flag;
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this->logger->log(this->logger, RAW|MOST, " => 0x%x", int16_val);
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/* write bytes to buffer (set bit is overwritten)*/
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this->write_bytes_to_buffer(this,&int16_val,sizeof(u_int16_t));
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this->current_bit = 0;
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break;
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}
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case U_INT_16:
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{
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u_int16_t int16_val = htons(*((u_int16_t*)(this->data_struct + offset)));
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this->logger->log_bytes(this->logger, RAW|MOST, " =>", (void*)&int16_val, sizeof(int16_val));
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this->write_bytes_to_buffer(this,&int16_val,sizeof(u_int16_t));
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break;
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}
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case U_INT_32:
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{
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u_int32_t int32_val = htonl(*((u_int32_t*)(this->data_struct + offset)));
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this->logger->log_bytes(this->logger, RAW|MOST, " =>", (void*)&int32_val, sizeof(int32_val));
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this->write_bytes_to_buffer(this,&int32_val,sizeof(u_int32_t));
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break;
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}
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case U_INT_64:
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{
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/* 64 bit integers are written as two 32 bit integers */
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u_int32_t int32_val_low = htonl(*((u_int32_t*)(this->data_struct + offset)));
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u_int32_t int32_val_high = htonl(*((u_int32_t*)(this->data_struct + offset) + 1));
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this->logger->log_bytes(this->logger, RAW|MOST, " => (low)", (void*)&int32_val_low, sizeof(int32_val_low));
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this->logger->log_bytes(this->logger, RAW|MOST, " => (high)", (void*)&int32_val_high, sizeof(int32_val_high));
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/* TODO add support for big endian machines */
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this->write_bytes_to_buffer(this,&int32_val_high,sizeof(u_int32_t));
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this->write_bytes_to_buffer(this,&int32_val_low,sizeof(u_int32_t));
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break;
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}
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case IKE_SPI:
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{
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/* 64 bit are written as they come :-) */
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this->write_bytes_to_buffer(this,(this->data_struct + offset),sizeof(u_int64_t));
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this->logger->log_bytes(this->logger, RAW|MOST, " =>", (void*)(this->data_struct + offset), sizeof(u_int64_t));
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break;
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}
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default:
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this->logger->log(this->logger, ERROR, "U_INT Type %s is not supported", mapping_find(encoding_type_m,int_type));
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return FAILED;
|
|
}
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return SUCCESS;
|
|
}
|
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|
|
/**
|
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* Implements private_generator_t's generate_reserved_field function.
|
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* See #private_generator_s.generate_reserved_field.
|
|
*/
|
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static status_t generate_reserved_field(private_generator_t *this,int bits)
|
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{
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status_t status;
|
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|
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/* only one bit or 8 bit fields are supported */
|
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if ((bits != 1) && (bits != 8))
|
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{
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this->logger->log(this->logger, ERROR, "Reserved field of %d bits cannot be generated", bits);
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return FAILED;
|
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}
|
|
/* make sure enough space is available in buffer */
|
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status = this->make_space_available(this,bits);
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if (status != SUCCESS)
|
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{
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return status;
|
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}
|
|
|
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if (bits == 1)
|
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{
|
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/* one bit processing */
|
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u_int8_t reserved_bit = ~(1 << (7 - this->current_bit));
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*(this->out_position) = *(this->out_position) & reserved_bit;
|
|
if (this->current_bit == 0)
|
|
{
|
|
/* memory must be zero */
|
|
*(this->out_position) = 0x00;
|
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}
|
|
|
|
|
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this->current_bit++;
|
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if (this->current_bit >= 8)
|
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{
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this->current_bit = this->current_bit % 8;
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this->out_position++;
|
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}
|
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}
|
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else
|
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{
|
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/* one byte processing*/
|
|
if (this->current_bit > 0)
|
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{
|
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this->logger->log(this->logger, ERROR,
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"Reserved field cannot be written cause allignement of current bit is %d",
|
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this->current_bit);
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|
return FAILED;
|
|
}
|
|
*(this->out_position) = 0x00;
|
|
this->out_position++;
|
|
}
|
|
|
|
return SUCCESS;
|
|
|
|
|
|
}
|
|
|
|
/**
|
|
* Implements private_generator_t's generate_flag function.
|
|
* See #private_generator_s.generate_flag.
|
|
*/
|
|
static status_t generate_flag (private_generator_t *this,u_int32_t offset)
|
|
{
|
|
status_t status;
|
|
/* value of current flag */
|
|
u_int8_t flag_value;
|
|
/* position of flag in current byte */
|
|
u_int8_t flag;
|
|
|
|
/* if the value in the data_struct is TRUE, flag_value is set to 1, 0 otherwise */
|
|
flag_value = (*((bool *) (this->data_struct + offset))) ? 1 : 0;
|
|
/* get flag position */
|
|
flag = (flag_value << (7 - this->current_bit));
|
|
|
|
/* make sure one bit is available in buffer */
|
|
status = this->make_space_available(this,1);
|
|
if (status != SUCCESS)
|
|
{
|
|
return status;
|
|
}
|
|
if (this->current_bit == 0)
|
|
{
|
|
/* memory must be zero */
|
|
*(this->out_position) = 0x00;
|
|
}
|
|
|
|
*(this->out_position) = *(this->out_position) | flag;
|
|
|
|
|
|
this->logger->log(this->logger, RAW|MOST, " => 0x0%x", *(this->out_position));
|
|
|
|
this->current_bit++;
|
|
if (this->current_bit >= 8)
|
|
{
|
|
this->current_bit = this->current_bit % 8;
|
|
this->out_position++;
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Implements private_generator_t's generate_from_chunk function.
|
|
* See #private_generator_s.generate_from_chunk.
|
|
*/
|
|
static status_t generate_from_chunk (private_generator_t *this,u_int32_t offset)
|
|
{
|
|
if (this->current_bit != 0)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "can not generate a chunk at Bitpos %d", this->current_bit);
|
|
return FAILED;
|
|
}
|
|
|
|
/* position in buffer */
|
|
chunk_t *attribute_value = (chunk_t *)(this->data_struct + offset);
|
|
|
|
this->logger->log_chunk(this->logger, RAW|MOST, " =>", attribute_value);
|
|
|
|
/* use write_bytes_to_buffer function to do the job */
|
|
return this->write_bytes_to_buffer(this,attribute_value->ptr,attribute_value->len);
|
|
|
|
}
|
|
|
|
/**
|
|
* Implements private_generator_t's generator_context_make_space_available function.
|
|
* See #private_generator_s.generator_context_make_space_available.
|
|
*/
|
|
static status_t make_space_available (private_generator_t *this, size_t bits)
|
|
{
|
|
while (((this->get_current_buffer_space(this) * 8) - this->current_bit) < bits)
|
|
{
|
|
/* must increase buffer */
|
|
u_int8_t *new_buffer;
|
|
size_t old_buffer_size = this->get_current_buffer_size(this);
|
|
size_t new_buffer_size = old_buffer_size + GENERATOR_DATA_BUFFER_INCREASE_VALUE;
|
|
size_t out_position_offset = ((this->out_position) - (this->buffer));
|
|
|
|
this->logger->log(this->logger, CONTROL|MOST, "increased gen buffer from %d to %d byte",
|
|
old_buffer_size, new_buffer_size);
|
|
|
|
/* Reallocate space for new buffer */
|
|
new_buffer = allocator_realloc(this->buffer,new_buffer_size);
|
|
if (new_buffer == NULL)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "reallocation of gen buffer failed!!!");
|
|
return OUT_OF_RES;
|
|
}
|
|
|
|
this->buffer = new_buffer;
|
|
|
|
this->out_position = (this->buffer + out_position_offset);
|
|
this->roof_position = (this->buffer + new_buffer_size);
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Implements private_generator_t's write_bytes_to_buffer function.
|
|
* See #private_generator_s.write_bytes_to_buffer.
|
|
*/
|
|
static status_t write_bytes_to_buffer (private_generator_t *this,void * bytes, size_t number_of_bytes)
|
|
{
|
|
int i;
|
|
status_t status;
|
|
u_int8_t *read_position = (u_int8_t *) bytes;
|
|
|
|
status = this->make_space_available(this,number_of_bytes * 8);
|
|
if (status != SUCCESS)
|
|
{
|
|
return status;
|
|
}
|
|
|
|
for (i = 0; i < number_of_bytes; i++)
|
|
{
|
|
*(this->out_position) = *(read_position);
|
|
read_position++;
|
|
this->out_position++;
|
|
}
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* Implements private_generator_t's write_bytes_to_buffer_at_offset function.
|
|
* See #private_generator_s.write_bytes_to_buffer_at_offset.
|
|
*/
|
|
static status_t write_bytes_to_buffer_at_offset (private_generator_t *this,void * bytes,size_t number_of_bytes,u_int32_t offset)
|
|
{
|
|
int i;
|
|
status_t status;
|
|
u_int8_t *read_position = (u_int8_t *) bytes;
|
|
u_int8_t *write_position;
|
|
u_int32_t free_space_after_offset = (this->get_current_buffer_size(this) - offset);
|
|
|
|
/* check first if enough space for new data is available */
|
|
if (number_of_bytes > free_space_after_offset)
|
|
{
|
|
status = this->make_space_available(this,(number_of_bytes - free_space_after_offset) * 8);
|
|
}
|
|
|
|
write_position = this->buffer + offset;
|
|
for (i = 0; i < number_of_bytes; i++)
|
|
{
|
|
*(write_position) = *(read_position);
|
|
read_position++;
|
|
write_position++;
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Implements generator_t's write_chunk function.
|
|
* See #generator_s.write_chunk.
|
|
*/
|
|
static status_t write_to_chunk (private_generator_t *this,chunk_t *data)
|
|
{
|
|
size_t data_length = this->get_current_data_length(this);
|
|
u_int32_t header_length_field = data_length;
|
|
|
|
/* write length into header length field */
|
|
if (this->header_length_position_offset > 0)
|
|
{
|
|
u_int32_t int32_val = htonl(header_length_field);
|
|
this->write_bytes_to_buffer_at_offset(this,&int32_val,sizeof(u_int32_t),this->header_length_position_offset);
|
|
}
|
|
|
|
if (this->current_bit > 0)
|
|
data_length++;
|
|
data->ptr = allocator_alloc(data_length);
|
|
if (data->ptr == NULL)
|
|
{
|
|
data->len = 0;
|
|
this->logger->log(this->logger, ERROR, "not enougth ressources to allocate chunk");
|
|
return OUT_OF_RES;
|
|
}
|
|
memcpy(data->ptr,this->buffer,data_length);
|
|
data->len = data_length;
|
|
|
|
this->logger->log_chunk(this->logger, RAW, "generated data of this parser", data);
|
|
|
|
return SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* Implements generator_t's generate_payload function.
|
|
* See #generator_s.generate_payload.
|
|
*/
|
|
static status_t generate_payload (private_generator_t *this,payload_t *payload)
|
|
{
|
|
int i;
|
|
status_t status;
|
|
this->data_struct = payload;
|
|
size_t rule_count;
|
|
encoding_rule_t *rules;
|
|
payload_type_t payload_type;
|
|
u_int8_t *payload_start;
|
|
|
|
/* get payload type */
|
|
payload_type = payload->get_type(payload);
|
|
/* spi size has to get reseted */
|
|
this->last_spi_size = 0;
|
|
|
|
payload_start = this->out_position;
|
|
|
|
this->logger->log(this->logger, CONTROL, "generating payload of type %s",
|
|
mapping_find(payload_type_m,payload_type));
|
|
|
|
/* each payload has its own encoding rules */
|
|
payload->get_encoding_rules(payload,&rules,&rule_count);
|
|
|
|
for (i = 0; i < rule_count;i++)
|
|
{
|
|
status = SUCCESS;
|
|
this->logger->log(this->logger, CONTROL|MORE, " generating rule %d %s",
|
|
i, mapping_find(encoding_type_m,rules[i].type));
|
|
switch (rules[i].type)
|
|
{
|
|
/* all u int values, IKE_SPI and ATTRIBUTE_TYPE are generated in generate_u_int_type */
|
|
case U_INT_4:
|
|
case U_INT_8:
|
|
case U_INT_16:
|
|
case U_INT_32:
|
|
case U_INT_64:
|
|
case IKE_SPI:
|
|
case ATTRIBUTE_TYPE:
|
|
{
|
|
status = this->generate_u_int_type(this,rules[i].type,rules[i].offset);
|
|
break;
|
|
}
|
|
case RESERVED_BIT:
|
|
{
|
|
status = this->generate_reserved_field(this,1);
|
|
break;
|
|
}
|
|
case RESERVED_BYTE:
|
|
{
|
|
status = this->generate_reserved_field(this,8);
|
|
break;
|
|
}
|
|
case FLAG:
|
|
{
|
|
status = this->generate_flag(this,rules[i].offset);
|
|
break;
|
|
}
|
|
case PAYLOAD_LENGTH:
|
|
{
|
|
/* position of payload lenght field is temporary stored */
|
|
this->last_payload_length_position_offset = this->get_current_buffer_offset(this);
|
|
/* payload length is generated like an U_INT_16 */
|
|
status = this->generate_u_int_type(this,U_INT_16,rules[i].offset);
|
|
break;
|
|
}
|
|
case HEADER_LENGTH:
|
|
{
|
|
/* position of header length field is temporary stored */
|
|
this->header_length_position_offset = this->get_current_buffer_offset(this);
|
|
/* header length is generated like an U_INT_32 */
|
|
status = this->generate_u_int_type(this,U_INT_32,rules[i].offset);
|
|
break;
|
|
}
|
|
case SPI_SIZE:
|
|
/* spi size is handled as 8 bit unsigned integer */
|
|
status = this->generate_u_int_type(this,U_INT_8,rules[i].offset);
|
|
/* last spi size is temporary stored */
|
|
this->last_spi_size = *((u_int8_t *)(this->data_struct + rules[i].offset));
|
|
break;
|
|
case SPI:
|
|
{
|
|
/* the SPI value is generated from chunk */
|
|
status = this->generate_from_chunk(this,rules[i].offset);
|
|
break;
|
|
}
|
|
case KEY_EXCHANGE_DATA:
|
|
{
|
|
/* the Key Exchange Data value is generated from chunk */
|
|
status = this->generate_from_chunk(this,rules[i].offset);
|
|
if (status != SUCCESS)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "could no write key exchange data from chunk");
|
|
return status;
|
|
}
|
|
|
|
u_int32_t payload_length_position_offset = this->last_payload_length_position_offset;
|
|
/* Length of KE_PAYLOAD is calculated */
|
|
u_int16_t length_of_ke_payload = KE_PAYLOAD_HEADER_LENGTH + ((chunk_t *)(this->data_struct + rules[i].offset))->len;
|
|
|
|
u_int16_t int16_val = htons(length_of_ke_payload);
|
|
status = this->write_bytes_to_buffer_at_offset(this,&int16_val,sizeof(u_int16_t),payload_length_position_offset);
|
|
if (status != SUCCESS)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "could not write payload length into buffer");
|
|
return status;
|
|
}
|
|
break;
|
|
}
|
|
case NOTIFICATION_DATA:
|
|
{
|
|
/* the Notification Data value is generated from chunk */
|
|
status = this->generate_from_chunk(this,rules[i].offset);
|
|
if (status != SUCCESS)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "Could not generate notification data from chunk");
|
|
return status;
|
|
}
|
|
|
|
u_int32_t payload_length_position_offset = this->last_payload_length_position_offset;
|
|
/* Length of Notification PAYLOAD is calculated */
|
|
u_int16_t length_of_notify_payload = NOTIFY_PAYLOAD_HEADER_LENGTH + ((chunk_t *)(this->data_struct + rules[i].offset))->len;
|
|
length_of_notify_payload += this->last_spi_size;
|
|
u_int16_t int16_val = htons(length_of_notify_payload);
|
|
|
|
status = this->write_bytes_to_buffer_at_offset(this,&int16_val,sizeof(u_int16_t),payload_length_position_offset);
|
|
if (status != SUCCESS)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "could not write payload length into buffer");
|
|
return status;
|
|
}
|
|
break;
|
|
}
|
|
case NONCE_DATA:
|
|
{
|
|
/* the Nonce Data value is generated from chunk */
|
|
status = this->generate_from_chunk(this, rules[i].offset);
|
|
|
|
if (status != SUCCESS)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "could not write nonce data from chunk");
|
|
return status;
|
|
}
|
|
|
|
u_int32_t payload_length_position_offset = this->last_payload_length_position_offset;
|
|
/* Length of nonce PAYLOAD is calculated */
|
|
u_int16_t length_of_nonce_payload = NONCE_PAYLOAD_HEADER_LENGTH + ((chunk_t *)(this->data_struct + rules[i].offset))->len;
|
|
u_int16_t int16_val = htons(length_of_nonce_payload);
|
|
|
|
status = this->write_bytes_to_buffer_at_offset(this,&int16_val,sizeof(u_int16_t),payload_length_position_offset);
|
|
if (status != SUCCESS)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "could not write payload length into buffer");
|
|
return status;
|
|
}
|
|
break;
|
|
}
|
|
case PROPOSALS:
|
|
{
|
|
/* before iterative generate the transforms, store the current payload length position */
|
|
u_int32_t payload_length_position_offset = this->last_payload_length_position_offset;
|
|
/* Length of SA_PAYLOAD is calculated */
|
|
u_int16_t length_of_sa_payload = SA_PAYLOAD_HEADER_LENGTH;
|
|
u_int16_t int16_val;
|
|
/* proposals are stored in a linked list and so accessed */
|
|
linked_list_t *proposals = *((linked_list_t **)(this->data_struct + rules[i].offset));
|
|
|
|
linked_list_iterator_t *iterator;
|
|
/* create forward iterator */
|
|
status = proposals->create_iterator(proposals,&iterator,TRUE);
|
|
if (status != SUCCESS)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "could not create iterator for proposals");
|
|
return status;
|
|
}
|
|
/* every proposal is processed (iterative call )*/
|
|
while (iterator->has_next(iterator))
|
|
{
|
|
payload_t *current_proposal;
|
|
u_int32_t before_generate_position_offset;
|
|
u_int32_t after_generate_position_offset;
|
|
|
|
status = iterator->current(iterator,(void **)¤t_proposal);
|
|
if (status != SUCCESS)
|
|
{
|
|
iterator->destroy(iterator);
|
|
return status;
|
|
}
|
|
before_generate_position_offset = this->get_current_buffer_offset(this);
|
|
status = this->public.generate_payload(&(this->public),current_proposal);
|
|
after_generate_position_offset = this->get_current_buffer_offset(this);
|
|
if (status != SUCCESS)
|
|
{
|
|
iterator->destroy(iterator);
|
|
return status;
|
|
}
|
|
|
|
/* increase size of transform */
|
|
length_of_sa_payload += (after_generate_position_offset - before_generate_position_offset);
|
|
}
|
|
iterator->destroy(iterator);
|
|
|
|
int16_val = htons(length_of_sa_payload);
|
|
status = this->write_bytes_to_buffer_at_offset(this,&int16_val,sizeof(u_int16_t),payload_length_position_offset);
|
|
if (status != SUCCESS)
|
|
{
|
|
this->logger->log(this->logger, ERROR, "could not write payload length into buffer");
|
|
return status;
|
|
}
|
|
break;
|
|
}
|
|
|
|
case TRANSFORMS:
|
|
{
|
|
/* before iterative generate the transforms, store the current length position */
|
|
u_int32_t payload_length_position_offset = this->last_payload_length_position_offset;
|
|
u_int16_t length_of_proposal = PROPOSAL_SUBSTRUCTURE_HEADER_LENGTH + this->last_spi_size;
|
|
u_int16_t int16_val;
|
|
linked_list_t *transforms = *((linked_list_t **)(this->data_struct + rules[i].offset));
|
|
linked_list_iterator_t *iterator;
|
|
|
|
/* create forward iterator */
|
|
status = transforms->create_iterator(transforms,&iterator,TRUE);
|
|
if (status != SUCCESS)
|
|
{
|
|
return status;
|
|
}
|
|
while (iterator->has_next(iterator))
|
|
{
|
|
payload_t *current_transform;
|
|
u_int32_t before_generate_position_offset;
|
|
u_int32_t after_generate_position_offset;
|
|
|
|
status = iterator->current(iterator,(void **)¤t_transform);
|
|
if (status != SUCCESS)
|
|
{
|
|
iterator->destroy(iterator);
|
|
return status;
|
|
}
|
|
|
|
before_generate_position_offset = this->get_current_buffer_offset(this);
|
|
status = this->public.generate_payload(&(this->public),current_transform);
|
|
after_generate_position_offset = this->get_current_buffer_offset(this);
|
|
if (status != SUCCESS)
|
|
{
|
|
iterator->destroy(iterator);
|
|
return status;
|
|
}
|
|
|
|
/* increase size of transform */
|
|
length_of_proposal += (after_generate_position_offset - before_generate_position_offset);
|
|
}
|
|
|
|
iterator->destroy(iterator);
|
|
|
|
int16_val = htons(length_of_proposal);
|
|
this->write_bytes_to_buffer_at_offset(this,&int16_val,sizeof(u_int16_t),payload_length_position_offset);
|
|
|
|
break;
|
|
}
|
|
case TRANSFORM_ATTRIBUTES:
|
|
{
|
|
/* before iterative generate the transform attributes, store the current length position */
|
|
u_int32_t transform_length_position_offset = this->last_payload_length_position_offset;
|
|
|
|
u_int16_t length_of_transform = TRANSFORM_SUBSTRUCTURE_HEADER_LENGTH;
|
|
u_int16_t int16_val;
|
|
linked_list_t *transform_attributes =*((linked_list_t **)(this->data_struct + rules[i].offset));
|
|
|
|
linked_list_iterator_t *iterator;
|
|
/* create forward iterator */
|
|
status = transform_attributes->create_iterator(transform_attributes,&iterator,TRUE);
|
|
if (status != SUCCESS)
|
|
{
|
|
return status;
|
|
}
|
|
while (iterator->has_next(iterator))
|
|
{
|
|
payload_t *current_attribute;
|
|
u_int32_t before_generate_position_offset;
|
|
u_int32_t after_generate_position_offset;
|
|
|
|
status = iterator->current(iterator,(void **)¤t_attribute);
|
|
if (status != SUCCESS)
|
|
{
|
|
iterator->destroy(iterator);
|
|
return status;
|
|
}
|
|
|
|
before_generate_position_offset = this->get_current_buffer_offset(this);
|
|
this->public.generate_payload(&(this->public),current_attribute);
|
|
after_generate_position_offset = this->get_current_buffer_offset(this);
|
|
|
|
/* increase size of transform */
|
|
length_of_transform += (after_generate_position_offset - before_generate_position_offset);
|
|
}
|
|
|
|
iterator->destroy(iterator);
|
|
|
|
int16_val = htons(length_of_transform);
|
|
this->write_bytes_to_buffer_at_offset(this,&int16_val,sizeof(u_int16_t),transform_length_position_offset);
|
|
|
|
break;
|
|
}
|
|
case ATTRIBUTE_FORMAT:
|
|
{
|
|
status = this->generate_flag(this,rules[i].offset);
|
|
/* Attribute format is a flag which is stored in context*/
|
|
this->attribute_format = *((bool *) (this->data_struct + rules[i].offset));
|
|
break;
|
|
}
|
|
|
|
case ATTRIBUTE_LENGTH_OR_VALUE:
|
|
{
|
|
if (this->attribute_format == FALSE)
|
|
{
|
|
status = this->generate_u_int_type(this,U_INT_16,rules[i].offset);
|
|
/* this field hold the length of the attribute */
|
|
this->attribute_length = *((u_int16_t *)(this->data_struct + rules[i].offset));
|
|
}
|
|
else
|
|
{
|
|
status = this->generate_u_int_type(this,U_INT_16,rules[i].offset);
|
|
// status = this->write_bytes_to_buffer(this,(this->data_struct + rules[i].offset),2);
|
|
}
|
|
break;
|
|
}
|
|
case ATTRIBUTE_VALUE:
|
|
{
|
|
if (this->attribute_format == FALSE)
|
|
{
|
|
this->logger->log(this->logger, CONTROL|MOST, "attribute value has not fixed size");
|
|
/* the attribute value is generated */
|
|
status = this->generate_from_chunk(this,rules[i].offset);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
this->logger->log(this->logger, ERROR, "field type %s is not supported",
|
|
mapping_find(encoding_type_m,rules[i].type));
|
|
return NOT_SUPPORTED;
|
|
}
|
|
}
|
|
this->logger->log_bytes(this->logger, RAW|MORE, "generated data for this payload",
|
|
payload_start, this->out_position-payload_start);
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* Implements generator_t's destroy function.
|
|
* See #generator_s.destroy.
|
|
*/
|
|
static status_t destroy(private_generator_t *this)
|
|
{
|
|
allocator_free(this->buffer);
|
|
global_logger_manager->destroy_logger(global_logger_manager,this->logger);
|
|
allocator_free(this);
|
|
return SUCCESS;
|
|
}
|
|
|
|
/*
|
|
* Described in header
|
|
*/
|
|
generator_t * generator_create()
|
|
{
|
|
private_generator_t *this;
|
|
|
|
this = allocator_alloc_thing(private_generator_t);
|
|
if (this == NULL)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
/* initiate public functions */
|
|
this->public.generate_payload = (status_t(*)(generator_t*, payload_t *)) generate_payload;
|
|
this->public.destroy = (status_t(*)(generator_t*)) destroy;
|
|
this->public.write_to_chunk = (status_t (*) (generator_t *,chunk_t *)) write_to_chunk;
|
|
|
|
|
|
/* initiate private functions */
|
|
this->get_current_buffer_size = get_current_buffer_size;
|
|
this->get_current_buffer_space = get_current_buffer_space;
|
|
this->get_current_data_length = get_current_data_length;
|
|
this->get_current_buffer_offset = get_current_buffer_offset;
|
|
this->generate_u_int_type = generate_u_int_type;
|
|
this->generate_reserved_field = generate_reserved_field;
|
|
this->generate_flag = generate_flag;
|
|
this->generate_from_chunk = generate_from_chunk;
|
|
this->make_space_available = make_space_available;
|
|
this->write_bytes_to_buffer = write_bytes_to_buffer;
|
|
this->write_bytes_to_buffer_at_offset = write_bytes_to_buffer_at_offset;
|
|
|
|
|
|
/* allocate memory for buffer */
|
|
this->buffer = allocator_alloc(GENERATOR_DATA_BUFFER_SIZE);
|
|
if (this->buffer == NULL)
|
|
{
|
|
allocator_free(this);
|
|
return NULL;
|
|
}
|
|
|
|
/* initiate private variables */
|
|
this->out_position = this->buffer;
|
|
this->roof_position = this->buffer + GENERATOR_DATA_BUFFER_SIZE;
|
|
this->data_struct = NULL;
|
|
this->current_bit = 0;
|
|
this->last_payload_length_position_offset = 0;
|
|
this->header_length_position_offset = 0;
|
|
this->logger = global_logger_manager->create_logger(global_logger_manager,GENERATOR,NULL);
|
|
this->logger->disable_level(this->logger, FULL);
|
|
this->logger->enable_level(this->logger, CONTROL);
|
|
|
|
if (this->logger == NULL)
|
|
{
|
|
allocator_free(this->buffer);
|
|
allocator_free(this);
|
|
return NULL;
|
|
}
|
|
return &(this->public);
|
|
}
|