clamav/libclamav/bytecode_api.h

/*
 *  ClamAV bytecode API.
 *
 *  Copyright (C) 2009 Sourcefire, Inc.
 *
 *  Authors: Török Edvin
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 *  MA 02110-1301, USA.
 */

/** @file */
#ifndef BYTECODE_API_H
#define BYTECODE_API_H

#ifdef __CLAMBC__
#include "bytecode_execs.h"
#include "bytecode_pe.h"
#include "bytecode_disasm.h"
#endif

#ifndef __CLAMBC__
#include "execs.h"
struct DISASM_RESULT;
#endif

struct foo {
    struct foo *nxt;
};

/** Bytecode trigger kind */
enum BytecodeKind {
    /** generic bytecode, not tied a specific hook */
    BC_GENERIC=0,
    _BC_START_HOOKS=256,
    /** triggered by a logical signature */
    BC_LOGICAL=256,
    /** a PE unpacker */
    BC_PE_UNPACKER,
    _BC_LAST_HOOK
};

#ifdef __CLAMBC__

/** @brief Logical signature match counts
 *
 *  This is a low-level variable, use the Macros in bytecode_local.h instead to
 *  access it.
 * */
extern const uint32_t __clambc_match_counts[64];
/** Executable info, if this is a PE hook */
extern const struct cli_exe_info __clambc_exeinfo;
/** PE data, if this is a PE hook */
extern const struct cli_pe_hook_data __clambc_pedata;

/** Kind of the bytecode */
const uint16_t __clambc_kind;

uint32_t test0(struct foo*, uint32_t);
uint32_t test1(uint32_t, uint32_t);

/**
 * @brief Reads specified amount of bytes from the current file
 * into a buffer.
 *
 * @param[in] size amount of bytes to read
 * @param[out] data pointer to buffer where data is read into
 * @return amount read.
 */
int32_t read(uint8_t *data, int32_t size);


enum {
    /**set file position to specified absolute position */
    SEEK_SET=0,
    /**set file position relative to current position */
    SEEK_CUR,
    /**set file position relative to file end*/
    SEEK_END
};

/**
 * @brief Writes the specified amount of bytes from a buffer to the
 * current temporary file.
 * @param[in] data pointer to buffer of data to write
 * @param[in] size amount of bytes to write
 * \p size bytes to temporary file, from the buffer pointed to
 * byte
 * @return amount of bytes successfully written
 */
int32_t write(uint8_t *data, int32_t size);

/**
 * @brief Changes the current file position to the specified one.
 * @sa SEEK_SET, SEEK_CUR, SEEK_END
 * @param[in] pos offset (absolute or relative depending on \p whence param)
 * @param[in] whence one of \p SEEK_SET, \p SEEK_CUR, \p SEEK_END
 * @return absolute position in file
 */
int32_t seek(int32_t pos, uint32_t whence);

/**
 * Sets the name of the virus found.
 *
 * @param[in] name the name of the virus
 * @param[in] len length of the virusname
 * @return 0
 */
uint32_t setvirusname(const uint8_t *name, uint32_t len);

/**
 * Prints a debug message.
 *
 * @param[in] str Message to print
 * @param[in] len length of message to print
 * @return 0
 */
uint32_t debug_print_str(const uint8_t *str, uint32_t len);

/**
 * Prints a number as a debug message.
 *
 * @param[in] a number to print
 * @param b unused
 * @return 0
 */
uint32_t debug_print_uint(uint32_t a, uint32_t b);

/**
 * Disassembles starting from current file position, the specified amount of
 * bytes.
 *  @param[out] result pointer to struct holding result
 *  @param[in] len how many bytes to disassemble
 *  @return 0 for success
 *
 * You can use lseek to disassemble starting from a different location.
 * This is a low-level API, the result is in ClamAV type-8 signature format 
 * (64 bytes/instruction).
 *  \sa DisassembleAt
 * */
uint32_t disasm_x86(struct DISASM_RESULT* result, uint32_t len);
#endif
#endif