denyhosts/clamav/libclamav/mbr.h

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2022-10-22 18:41:00 +08:00
/*
* Copyright (C) 2014-2022 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
*
* Authors: Kevin Lin <klin@sourcefire.com>
*
* 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.
*/
#ifndef __MBR_H
#define __MBR_H
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include "clamav-types.h"
#include "others.h"
#define MBR_SECTOR_SIZE 512
#define MBR_MAX_PARTITION_ENTRIES 4
#define CL_MAX_LOGICAL_PARTITIONS 50
#define MBR_SIGNATURE 0x55aa
#define MBR_SECTOR 0
/* MBR Status */
#define MBR_STATUS_INACTIVE 0x00
/* other values are invalid status */
#define MBR_STATUS_ACTIVE 0x80
/* End MBR Status */
/* MBR Partition Types */
#define MBR_EMPTY 0x00
#define MBR_EXTENDED 0x05
#define MBR_HYBRID 0xed
#define MBR_PROTECTIVE 0xee
/* End Partition Types */
#ifndef HAVE_ATTRIB_PACKED
#define __attribute__(x)
#endif
#ifdef HAVE_PRAGMA_PACK
#pragma pack(1)
#endif
#ifdef HAVE_PRAGMA_PACK_HPPA
#pragma pack 1
#endif
/* 16-byte MBR partition entry, little-endian */
struct mbr_partition_entry {
uint8_t status; /* 0x80 = active, 0x00 = inactive */
uint8_t firstCHS[3];
uint8_t type;
uint8_t lastCHS[3];
uint32_t firstLBA __attribute__((packed));
uint32_t numLBA __attribute__((packed));
};
struct mbr_boot_record {
/* 446 bytes of reserved, implementation-based data */
struct mbr_partition_entry entries[4];
uint16_t signature __attribute__((packed));
};
#ifdef HAVE_PRAGMA_PACK
#pragma pack()
#endif
#ifdef HAVE_PRAGMA_PACK_HPPA
#pragma pack
#endif
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cl_error_t cli_mbr_check(const unsigned char *buff, size_t len, size_t maplen);
cl_error_t cli_mbr_check2(cli_ctx *ctx, size_t sectorsize);
cl_error_t cli_scanmbr(cli_ctx *ctx, size_t sectorsize);
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void mbr_convert_to_host(struct mbr_boot_record *record);
#endif