/*
 * COPYRIGHT:        See COPYRIGHT.TXT
 * PROJECT:          Ext2 File System Driver for WinNT/2K/XP
 * FILE:             access.c
 * PROGRAMMER:       Matt Wu <mattwu@163.com>
 * HOMEPAGE:         http://www.ext2fsd.com
 * UPDATE HISTORY:
 */

/* INCLUDES *****************************************************************/

#include "ext2fs.h"

/* GLOBALS ***************************************************************/

extern PEXT2_GLOBAL Ext2Global;

/* DEFINITIONS *************************************************************/

int Ext2CheckInodeAccess(PEXT2_VCB Vcb, struct inode *in, int attempt)
{
    int granted = 0;

    uid_t uid = Vcb->uid;
    gid_t gid = Vcb->gid;

    if (IsFlagOn(Vcb->Flags, VCB_USER_EIDS)) {
        uid = Vcb->euid;
        gid = Vcb->egid;
    }

    if (!uid || uid == in->i_uid) {
        /* grant all access for inode owner or root */
        granted = Ext2FileCanRead | Ext2FileCanWrite | Ext2FileCanExecute;
    } else if (gid == in->i_gid) {
        if (Ext2IsGroupReadOnly(in->i_mode))
            granted = Ext2FileCanRead | Ext2FileCanExecute;
        else if (Ext2IsGroupWritable(in->i_mode))
            granted = Ext2FileCanRead | Ext2FileCanWrite | Ext2FileCanExecute;
    } else {
        if (Ext2IsOtherReadOnly(in->i_mode))
            granted = Ext2FileCanRead | Ext2FileCanExecute;
        else if (Ext2IsOtherWritable(in->i_mode))
            granted = Ext2FileCanRead | Ext2FileCanWrite | Ext2FileCanExecute;

    }

    return IsFlagOn(granted, attempt);
}

int Ext2CheckFileAccess(PEXT2_VCB Vcb, PEXT2_MCB Mcb, int attempt)
{
    return Ext2CheckInodeAccess(Vcb, &Mcb->Inode, attempt);
}