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Diffstat (limited to 'Source')
| -rw-r--r-- | Source/charon/encodings.h | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/Source/charon/encodings.h b/Source/charon/encodings.h new file mode 100644 index 000000000..9c7ede1c4 --- /dev/null +++ b/Source/charon/encodings.h @@ -0,0 +1,196 @@ +/** + * @file encodings.h + * + * @brief Type definitions for parser and generator + * Also, Payload types are defined here. + * + * Header is parsed like a payload and gets its one payload_id + * from PRIVATE USE space. Also the substructures get their own + * payload_id from PRIVATE_USE space + * + * + */ + +/* + * 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. + */ + +#ifndef ENCODINGS_H_ +#define ENCODINGS_H_ + +#include <freeswan.h> +#include <pluto/constants.h> +#include <pluto/defs.h> + +/** + * @brief All different kinds of encoding types. + * + * Each field of an IKEv2-Message (in header or payload) + * which has to be parsed or generated differently has its own + * enum value. + */ +typedef enum encoding_e encoding_t; + +enum encoding_e{ + /** + * Representing a 4 Bit unsigned int value + * + * + * When generating it must be changed from host to network order. + * The value is read from the associated data struct. + * The current write position is moved 4 bit forward afterwards. + * + * When parsing it must be changed from network to host order. + * The value is written to the associated data struct. + * The current read pointer is moved 4 bit forward afterwards. + */ + U_INT_4, + /** + * Representing a 8 Bit unsigned int value + * + * + * When generating it must be changed from host to network order. + * The value is read from the associated data struct. + * The current write position is moved 8 bit forward afterwards. + * + * When parsing it must be changed from network to host order. + * The value is written to the associated data struct. + * The current read pointer is moved 8 bit forward afterwards. + */ + U_INT_8, + /** + * Representing a 16 Bit unsigned int value + * + * + * When generating it must be changed from host to network order. + * The value is read from the associated data struct. + * The current write position is moved 16 bit forward afterwards. + * + * When parsing it must be changed from network to host order. + * The value is written to the associated data struct. + * The current read pointer is moved 16 bit forward afterwards. + */ + U_INT_16, + /** + * Representing a 32 Bit unsigned int value + * + * When generating it must be changed from host to network order. + * The value is read from the associated data struct. + * The current write position is moved 32 bit forward afterwards. + * + * When parsing it must be changed from network to host order. + * The value is written to the associated data struct. + * The current read pointer is moved 32 bit forward afterwards. + */ + + U_INT_32, + /** + * Representing a 64 Bit unsigned int value + * + * When generating it must be changed from host to network order. + * The value is read from the associated data struct. + * The current write position is moved 64 bit forward afterwards. + * + * When parsing it must be changed from network to host order. + * The value is written to the associated data struct. + * The current read pointer is moved 64 bit forward afterwards. + */ + U_INT_64, + /** + * @brief represents a RESERVED_BIT used in FLAG-Bytes + * + * When generating, the next bit is set to zero and the current write + * position is moved one bit forward. + * No value is read from the associated data struct. + * The current write position is moved 1 bit forward afterwards. + * + * When parsing, the current read pointer is moved one bit forward. + * No value is written to the associated data struct. + * The current read pointer is moved 1 bit forward afterwards. + */ + RESERVED_BIT, + /** + * @brief represents a RESERVED_BYTE + * + * When generating, the next byte is set to zero and the current write + * position is moved one byte forward. + * No value is read from the associated data struct. + * The current write position is moved 1 byte forward afterwards. + * + * When parsing, the current read pointer is moved one byte forward. + * No value is written to the associated data struct. + * The current read pointer is moved 1 byte forward afterwards. + */ + RESERVED_BYTE, + /** + * Representing a 1 Bit flag. + * + * When generation, the next bit is set to 1 if the associated value + * in the data struct is TRUE, 0 otherwise. The current write position + * is moved 1 bit forward afterwards. + * + * When parsing, the next bit is read and stored in the associated data + * struct. 0 means FALSE, 1 means TRUE, The current read pointer + * is moved 1 bit forward afterwards + */ + FLAG, + /** + * Representating a length field + * + * When generating it must be changed from host to network order. + * The value is read from the associated data struct. + * The current write position is moved 32 bit forward afterwards. + * + * When parsing it must be changed from network to host order. + * The value is written to the associated data struct. + * The current read pointer is moved 32 bit forward afterwards. + */ + LENGTH, + /** + * Representating a spi size field + * + * When generating it must be changed from host to network order. + * The value is read from the associated data struct. + * The current write position is moved 32 bit forward afterwards. + * + * When parsing it must be changed from network to host order. + * The value is written to the associated data struct. + * The current read pointer is moved 32 bit forward afterwards. + */ + SPI_SIZE +}; + +/** + * An encoding rule is a mapping of a specific encoding type to + * a location in the data struct where the current field is stored to + * or read from. + * + * For examples see directory encodings/ + * + * This rules are used by parser and generator + */ +typedef struct encoding_rule_s encoding_rule_t; + +struct encoding_rule_s{ + /** + * Encoding type + */ + encoding_t type; + /** + * Offset in the data struct + */ + u_int32_t offset; +}; + +#endif /*ENCODINGS_H_*/ |