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#ifndef KERNEL__OAS__SMALL__PROTOCOL_H
#define KERNEL__OAS__SMALL__PROTOCOL_H

#ifndef __KERNEL__
#include <sys/types.h>
#endif

#pragma pack(1)

enum ReqTypes
{
    CHECK_FILE       = 1, // both MONITOR and SAMBA
    CHECK_FILE_RES   = 2, // both MONITOR and SAMBA
    NOTIFY_FILE      = 3, // both MONITOR and SAMBA
    MONITOR_SHUTDOWN = 4, // only MONITOR
    SAMBA_CONNECT    = 5, // only SAMBA
    CHECK_SIGN       = 6
};

#define FS_PROTOCOL_VERSION 3

typedef struct
{
    u_int8_t request; // common_request_types
    u_int8_t version; // MONITOR_INTERFACE_VERSION/SAMBA_INTERFACE_VERSION
    u_int32_t data_size;
} ProtocolHeader;

// struct for universal access(cast) to any data
typedef struct
{
    ProtocolHeader header;
    char data[0];

} ProtocolData;

// CHECK_FILE

enum FileOpType
{
    FILE_OPEN_OPER,
    FILE_CLOSE_OPER,
    FILE_EXEC_OPER
};

typedef struct
{
    ProtocolHeader header;
    u_int32_t uid; // effective user ID
    u_int32_t gid; // effective group ID
    u_int32_t pid; // process ID
    int32_t flags; // flags like O_RDONLY etc
    u_int8_t file_op_type; // enum file_oper_type
    u_int16_t queue_id; // used only in MONITOR, but probably will be used in SAMBA
                        // in the future
    // size of dev_t and ino_t is platform specific
    u_int64_t dev;
    u_int64_t ino;
    int64_t mtime;
    int64_t size;
    u_int32_t owner_uid;
    u_int32_t file_mode; // st_mode from struct stat
    int64_t f_type; // file system type, it's for Linux
    u_int8_t fstypelen; // it is zero on Linux
    char strings[0]; // fstypename,filename
} CheckFileData2;

// ANSWER_FILE
typedef struct
{
    ProtocolHeader header;
    u_int8_t result; // result
    u_int16_t queue_id; // used only in MONITOR, but probably will be used in SAMBA
                        // in the future
} CheckFileResultData;
// string "viruses" removed from answer_file, its unused

// SAMBA_CONNECT
typedef struct
{
    ProtocolHeader header;
    u_int16_t queue_id; // session_id
    char data[0]; // user,ip,host
} SambaConnectData;

// NOTIFY_FILE
enum FileNotifyType
{
    FILE_UNLINK_OPER,
    FILE_RENAME_OPER,
    FILE_NAME_TOO_LONG
};

typedef struct
{
    ProtocolHeader header;
    u_int8_t file_type; // enum file_notify_type
    u_int64_t dev;
    u_int64_t ino;
    char name[0]; // filename
} NotifyFileData;

enum FileAccessType
{
    FILE_ACCESS_ACCEPT,
    FILE_ACCESS_DENY,
    FILE_ACCESS_NO_CHECK
};

typedef struct
{
    char* data;
    size_t length;
} PackedBuffer;

#pragma pack()

typedef struct
{
    u_int16_t queue_id;
    enum FileAccessType result;
} CheckFileResultInfoData;

typedef void CheckFileResultCallback(void* context,
                                     const CheckFileResultInfoData* data);
typedef void ModuleShutdownCallback(void* context);
typedef struct
{
    uid_t user; // effective user id
    gid_t group; // effective group id
    pid_t process;
    u_int16_t queue_id;
    const char* filename;
    enum FileOpType oper;
    int flags;
    dev_t device;
    ino_t inode;
    const char* host;
    // added in version 2
    u_int8_t version;
    int64_t mtime;
    int64_t size;
    u_int32_t owner_uid;
    u_int32_t file_mode; // st_mode from struct stat
    int64_t f_type; // file system type, it's for Linux
    u_int8_t fstypelen; // it is zero on Linux
    const char* fstypename;
} CheckFileInfoData;

typedef void CheckFileCallback(void* context, const CheckFileInfoData* data);
typedef struct
{
    const char* filename;
    enum FileNotifyType oper;
    dev_t device;
    ino_t inode;
} NotifyFileInfoData;

typedef void NotifyFileCallback(void* context, const NotifyFileInfoData* data);
typedef struct
{
    u_int16_t queue_id;
    const char* user;
    const char* ip;
    const char* host;

} SambaConnectInfoData;

typedef void SambaConnectCallback(void* context, SambaConnectInfoData* data);

typedef struct
{
    CheckFileCallback* check_file; // CHECK_FILE
    NotifyFileCallback* notify_file; // NOTIFY_FILE
    SambaConnectCallback* samba_connect; // SAMBA_CONNECT
    CheckFileResultCallback* check_file_result; // ANSWER_FILE
    ModuleShutdownCallback* shutdown; // MONITOR_SHUTDOWN
    CheckFileCallback* check_sign; // CHECK_SIGN

} ProtocolCallbacks;

#endif // KERNEL__OAS__SMALL__PROTOCOL_H

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