trunk/rdesktop/disk.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Disk Redirection
   Copyright (C) Jeroen Meijer 2003

   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.

   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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "disk.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>              /* open, close */
#include <dirent.h>             /* opendir, closedir, readdir */
#include <fnmatch.h>
#include <errno.h>              /* errno */

#include <utime.h>
#include <time.h>               /* ctime */

#if (defined(HAVE_DIRFD) || (HAVE_DECL_DIRFD == 1))
#define DIRFD(a) (dirfd(a))
#else
#define DIRFD(a) ((a)->DIR_FD_MEMBER_NAME)
#endif

/* TODO: let autoconf figure out everything below... */
#if (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
#define SOLARIS
#endif

#if (defined(SOLARIS) || defined (__hpux) || defined(__BEOS__))
#include <sys/statvfs.h>        /* solaris statvfs */
/* TODO: Fix mntent-handling for solaris/hpux
 * #include <sys/mntent.h> */
#undef HAVE_MNTENT_H
#define MNTENT_PATH "/etc/mnttab"
#define STATFS_FN(path, buf) (statvfs(path,buf))
#define STATFS_T statvfs
#define F_NAMELEN(buf) ((buf).f_namemax)

#elif (defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__) || defined(__APPLE__))
#include <sys/param.h>
#include <sys/mount.h>
#define STATFS_FN(path, buf) (statfs(path,buf))
#define STATFS_T statfs
#define F_NAMELEN(buf) (NAME_MAX)

#elif (defined(__SGI_IRIX__))
#include <sys/types.h>
#include <sys/statvfs.h>
#define STATFS_FN(path, buf) (statvfs(path,buf))
#define STATFS_T statvfs
#define F_NAMELEN(buf) ((buf).f_namemax)

#else
#include <sys/vfs.h>            /* linux statfs */
#include <mntent.h>
#define HAVE_MNTENT_H
#define MNTENT_PATH "/etc/mtab"
#define STATFS_FN(path, buf) (statfs(path,buf))
#define STATFS_T statfs
#define F_NAMELEN(buf) ((buf).f_namelen)
#endif

#include "rdesktop.h"

extern RDPDR_DEVICE g_rdpdr_device[];

FILEINFO g_fileinfo[MAX_OPEN_FILES];

typedef struct
{
        char name[256];
        char label[256];
        unsigned long serial;
        char type[256];
} FsInfoType;


static time_t
get_create_time(struct stat *st)
{
        time_t ret, ret1;

        ret = MIN(st->st_ctime, st->st_mtime);
        ret1 = MIN(ret, st->st_atime);

        if (ret1 != (time_t) 0)
                return ret1;

        return ret;
}

/* Convert seconds since 1970 to a filetime */
static void
seconds_since_1970_to_filetime(time_t seconds, uint32 * high, uint32 * low)
{
        unsigned long long ticks;

        ticks = (seconds + 11644473600LL) * 10000000;
        *low = (uint32) ticks;
        *high = (uint32) (ticks >> 32);
}

/* Convert seconds since 1970 back to filetime */
static time_t
convert_1970_to_filetime(uint32 high, uint32 low)
{
        unsigned long long ticks;
        time_t val;

        ticks = low + (((unsigned long long) high) << 32);
        ticks /= 10000000;
        ticks -= 11644473600LL;

        val = (time_t) ticks;
        return (val);

}

/* A wrapper for ftruncate which supports growing files, even if the
   native ftruncate doesn't. This is needed on Linux FAT filesystems,
   for example. */
static int
ftruncate_growable(int fd, off_t length)
{
        int ret;
        off_t pos;
        static const char zero;

        /* Try the simple method first */
        if ((ret = ftruncate(fd, length)) != -1)
        {
                return ret;
        }

        /* 
         * Some kind of error. Perhaps we were trying to grow. Retry
         * in a safe way.
         */

        /* Get current position */
        if ((pos = lseek(fd, 0, SEEK_CUR)) == -1)
        {
                perror("lseek");
                return -1;
        }

        /* Seek to new size */
        if (lseek(fd, length, SEEK_SET) == -1)
        {
                perror("lseek");
                return -1;
        }

        /* Write a zero */
        if (write(fd, &zero, 1) == -1)
        {
                perror("write");
                return -1;
        }

        /* Truncate. This shouldn't fail. */
        if (ftruncate(fd, length) == -1)
        {
                perror("ftruncate");
                return -1;
        }

        /* Restore position */
        if (lseek(fd, pos, SEEK_SET) == -1)
        {
                perror("lseek");
                return -1;
        }

        return 0;
}


/* Enumeration of devices from rdesktop.c        */
/* returns numer of units found and initialized. */
/* optarg looks like ':h=/mnt/floppy,b=/mnt/usbdevice1' */
/* when it arrives to this function.             */
int
disk_enum_devices(uint32 * id, char *optarg)
{
        char *pos = optarg;
        char *pos2;
        int count = 0;

        // skip the first colon
        optarg++;
        while ((pos = next_arg(optarg, ',')) && *id < RDPDR_MAX_DEVICES)
        {
                pos2 = next_arg(optarg, '=');

                strncpy(g_rdpdr_device[*id].name, optarg, sizeof(g_rdpdr_device[*id].name));
                if (strlen(optarg) > 8)
                        fprintf(stderr, "share name %s truncated to %s\n", optarg,
                                g_rdpdr_device[*id].name);

                g_rdpdr_device[*id].local_path = xmalloc(strlen(pos2) + 1);
                strcpy(g_rdpdr_device[*id].local_path, pos2);
                g_rdpdr_device[*id].device_type = DEVICE_TYPE_DISK;
                count++;
                (*id)++;

                optarg = pos;
        }
        return count;
}

/* Opens or creates a file or directory */
static NTSTATUS
disk_create(uint32 device_id, uint32 accessmask, uint32 sharemode, uint32 create_disposition,
            uint32 flags_and_attributes, char *filename, NTHANDLE * phandle)
{
        NTHANDLE handle;
        DIR *dirp;
        int flags, mode;
        char path[256];
        struct stat filestat;

        handle = 0;
        dirp = NULL;
        flags = 0;
        mode = S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH;

        if (*filename && filename[strlen(filename) - 1] == '/')
                filename[strlen(filename) - 1] = 0;
        sprintf(path, "%s%s", g_rdpdr_device[device_id].local_path, filename);

        switch (create_disposition)
        {
                case CREATE_ALWAYS:

                        // Delete existing file/link.
                        unlink(path);
                        flags |= O_CREAT;
                        break;

                case CREATE_NEW:

                        // If the file already exists, then fail.
                        flags |= O_CREAT | O_EXCL;
                        break;

                case OPEN_ALWAYS:

                        // Create if not already exists.
                        flags |= O_CREAT;
                        break;

                case OPEN_EXISTING:

                        // Default behaviour
                        break;

                case TRUNCATE_EXISTING:

                        // If the file does not exist, then fail.
                        flags |= O_TRUNC;
                        break;
        }

        //printf("Open: \"%s\"  flags: %u, accessmask: %u sharemode: %u create disp: %u\n", path, flags_and_attributes, accessmask, sharemode, create_disposition);

        // Get information about file and set that flag ourselfs
        if ((stat(path, &filestat) == 0) && (S_ISDIR(filestat.st_mode)))
        {
                if (flags_and_attributes & FILE_NON_DIRECTORY_FILE)
                        return STATUS_FILE_IS_A_DIRECTORY;
                else
                        flags_and_attributes |= FILE_DIRECTORY_FILE;
        }

        if (flags_and_attributes & FILE_DIRECTORY_FILE)
        {
                if (flags & O_CREAT)
                {
                        mkdir(path, mode);
                }

                dirp = opendir(path);
                if (!dirp)
                {
                        switch (errno)
                        {
                                case EACCES:

                                        return STATUS_ACCESS_DENIED;

                                case ENOENT:

                                        return STATUS_NO_SUCH_FILE;

                                default:

                                        perror("opendir");
                                        return STATUS_NO_SUCH_FILE;
                        }
                }
                handle = DIRFD(dirp);
        }
        else
        {

                if (accessmask & GENERIC_ALL
                    || (accessmask & GENERIC_READ && accessmask & GENERIC_WRITE))
                {
                        flags |= O_RDWR;
                }
                else if ((accessmask & GENERIC_WRITE) && !(accessmask & GENERIC_READ))
                {
                        flags |= O_WRONLY;
                }
                else
                {
                        flags |= O_RDONLY;
                }

                handle = open(path, flags, mode);
                if (handle == -1)
                {
                        switch (errno)
                        {
                                case EISDIR:

                                        return STATUS_FILE_IS_A_DIRECTORY;

                                case EACCES:

                                        return STATUS_ACCESS_DENIED;

                                case ENOENT:

                                        return STATUS_NO_SUCH_FILE;
                                case EEXIST:

                                        return STATUS_OBJECT_NAME_COLLISION;
                                default:

                                        perror("open");
                                        return STATUS_NO_SUCH_FILE;
                        }
                }

                /* all read and writes of files should be non blocking */
                if (fcntl(handle, F_SETFL, O_NONBLOCK) == -1)
                        perror("fcntl");
        }

        if (handle >= MAX_OPEN_FILES)
        {
                error("Maximum number of open files (%s) reached. Increase MAX_OPEN_FILES!\n",
                      handle);
                exit(1);
        }

        if (dirp)
                g_fileinfo[handle].pdir = dirp;
        g_fileinfo[handle].device_id = device_id;
        g_fileinfo[handle].flags_and_attributes = flags_and_attributes;
        strncpy(g_fileinfo[handle].path, path, 255);

        *phandle = handle;
        return STATUS_SUCCESS;
}

static NTSTATUS
disk_close(NTHANDLE handle)
{
        struct fileinfo *pfinfo;

        pfinfo = &(g_fileinfo[handle]);

        if (pfinfo->flags_and_attributes & FILE_DIRECTORY_FILE)
        {
                closedir(pfinfo->pdir);
                //FIXME: Should check exit code
        }
        else
        {
                close(handle);
        }

        return STATUS_SUCCESS;
}

static NTSTATUS
disk_read(NTHANDLE handle, uint8 * data, uint32 length, uint32 offset, uint32 * result)
{
        int n;

#if 0
        /* browsing dir ????        */
        /* each request is 24 bytes */
        if (g_fileinfo[handle].flags_and_attributes & FILE_DIRECTORY_FILE)
        {
                *result = 0;
                return STATUS_SUCCESS;
        }
#endif

        lseek(handle, offset, SEEK_SET);

        n = read(handle, data, length);

        if (n < 0)
        {
                *result = 0;
                switch (errno)
                {
                        case EISDIR:
                                return STATUS_FILE_IS_A_DIRECTORY;
                        default:
                                perror("read");
                                return STATUS_INVALID_PARAMETER;
                }
        }

        *result = n;

        return STATUS_SUCCESS;
}

static NTSTATUS
disk_write(NTHANDLE handle, uint8 * data, uint32 length, uint32 offset, uint32 * result)
{
        int n;

        lseek(handle, offset, SEEK_SET);

        n = write(handle, data, length);

        if (n < 0)
        {
                perror("write");
                *result = 0;
                switch (errno)
                {
                        case ENOSPC:
                                return STATUS_DISK_FULL;
                        default:
                                return STATUS_ACCESS_DENIED;
                }
        }

        *result = n;

        return STATUS_SUCCESS;
}

NTSTATUS
disk_query_information(NTHANDLE handle, uint32 info_class, STREAM out)
{
        uint32 file_attributes, ft_high, ft_low;
        struct stat filestat;
        char *path, *filename;

        path = g_fileinfo[handle].path;

        // Get information about file
        if (fstat(handle, &filestat) != 0)
        {
                perror("stat");
                out_uint8(out, 0);
                return STATUS_ACCESS_DENIED;
        }

        // Set file attributes
        file_attributes = 0;
        if (S_ISDIR(filestat.st_mode))
                file_attributes |= FILE_ATTRIBUTE_DIRECTORY;

        filename = 1 + strrchr(path, '/');
        if (filename && filename[0] == '.')
                file_attributes |= FILE_ATTRIBUTE_HIDDEN;

        if (!file_attributes)
                file_attributes |= FILE_ATTRIBUTE_NORMAL;

        if (!(filestat.st_mode & S_IWUSR))
                file_attributes |= FILE_ATTRIBUTE_READONLY;

        // Return requested data
        switch (info_class)
        {
                case FileBasicInformation:
                        seconds_since_1970_to_filetime(get_create_time(&filestat), &ft_high,
                                                       &ft_low);
                        out_uint32_le(out, ft_low);     //create_access_time
                        out_uint32_le(out, ft_high);

                        seconds_since_1970_to_filetime(filestat.st_atime, &ft_high, &ft_low);
                        out_uint32_le(out, ft_low);     //last_access_time
                        out_uint32_le(out, ft_high);

                        seconds_since_1970_to_filetime(filestat.st_mtime, &ft_high, &ft_low);
                        out_uint32_le(out, ft_low);     //last_write_time
                        out_uint32_le(out, ft_high);

                        seconds_since_1970_to_filetime(filestat.st_ctime, &ft_high, &ft_low);
                        out_uint32_le(out, ft_low);     //last_change_time
                        out_uint32_le(out, ft_high);

                        out_uint32_le(out, file_attributes);
                        break;

                case FileStandardInformation:

                        out_uint32_le(out, filestat.st_size);   //Allocation size
                        out_uint32_le(out, 0);
                        out_uint32_le(out, filestat.st_size);   //End of file
                        out_uint32_le(out, 0);
                        out_uint32_le(out, filestat.st_nlink);  //Number of links
                        out_uint8(out, 0);      //Delete pending
                        out_uint8(out, S_ISDIR(filestat.st_mode) ? 1 : 0);      //Directory
                        break;

                case FileObjectIdInformation:

                        out_uint32_le(out, file_attributes);    /* File Attributes */
                        out_uint32_le(out, 0);  /* Reparse Tag */
                        break;

                default:

                        unimpl("IRP Query (File) Information class: 0x%x\n", info_class);
                        return STATUS_INVALID_PARAMETER;
        }
        return STATUS_SUCCESS;
}

NTSTATUS
disk_set_information(NTHANDLE handle, uint32 info_class, STREAM in, STREAM out)
{
        uint32 length, file_attributes, ft_high, ft_low;
        char newname[256], fullpath[256];
        struct fileinfo *pfinfo;

        int mode;
        struct stat filestat;
        time_t write_time, change_time, access_time, mod_time;
        struct utimbuf tvs;
        struct STATFS_T stat_fs;

        pfinfo = &(g_fileinfo[handle]);

        switch (info_class)
        {
                case FileBasicInformation:
                        write_time = change_time = access_time = 0;

                        in_uint8s(in, 4);       /* Handle of root dir? */
                        in_uint8s(in, 24);      /* unknown */

                        // CreationTime
                        in_uint32_le(in, ft_low);
                        in_uint32_le(in, ft_high);

                        // AccessTime
                        in_uint32_le(in, ft_low);
                        in_uint32_le(in, ft_high);
                        if (ft_low || ft_high)
                                access_time = convert_1970_to_filetime(ft_high, ft_low);

                        // WriteTime
                        in_uint32_le(in, ft_low);
                        in_uint32_le(in, ft_high);
                        if (ft_low || ft_high)
                                write_time = convert_1970_to_filetime(ft_high, ft_low);

                        // ChangeTime
                        in_uint32_le(in, ft_low);
                        in_uint32_le(in, ft_high);
                        if (ft_low || ft_high)
                                change_time = convert_1970_to_filetime(ft_high, ft_low);

                        in_uint32_le(in, file_attributes);

                        if (fstat(handle, &filestat))
                                return STATUS_ACCESS_DENIED;

                        tvs.modtime = filestat.st_mtime;
                        tvs.actime = filestat.st_atime;
                        if (access_time)
                                tvs.actime = access_time;


                        if (write_time || change_time)
                                mod_time = MIN(write_time, change_time);
                        else
                                mod_time = write_time ? write_time : change_time;

                        if (mod_time)
                                tvs.modtime = mod_time;


                        if (access_time || write_time || change_time)
                        {
#if WITH_DEBUG_RDP5
                                printf("FileBasicInformation access       time %s",
                                       ctime(&tvs.actime));
                                printf("FileBasicInformation modification time %s",
                                       ctime(&tvs.modtime));
#endif
                                if (utime(pfinfo->path, &tvs))
                                        return STATUS_ACCESS_DENIED;
                        }

                        if (!file_attributes)
                                break;  // not valid

                        mode = filestat.st_mode;

                        if (file_attributes & FILE_ATTRIBUTE_READONLY)
                                mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
                        else
                                mode |= S_IWUSR;

                        mode &= 0777;
#if WITH_DEBUG_RDP5
                        printf("FileBasicInformation set access mode 0%o", mode);
#endif

                        if (fchmod(handle, mode))
                                return STATUS_ACCESS_DENIED;

                        break;

                case FileRenameInformation:

                        in_uint8s(in, 4);       /* Handle of root dir? */
                        in_uint8s(in, 0x1a);    /* unknown */
                        in_uint32_le(in, length);

                        if (length && (length / 2) < 256)
                        {
                                rdp_in_unistr(in, newname, length);
                                convert_to_unix_filename(newname);
                        }
                        else
                        {
                                return STATUS_INVALID_PARAMETER;
                        }

                        sprintf(fullpath, "%s%s", g_rdpdr_device[pfinfo->device_id].local_path,
                                newname);

                        if (rename(pfinfo->path, fullpath) != 0)
                        {
                                perror("rename");
                                return STATUS_ACCESS_DENIED;
                        }
                        break;

                case FileDispositionInformation:
                        /* As far as I understand it, the correct
                           thing to do here is to *schedule* a delete,
                           so it will be deleted when the file is
                           closed. Subsequent
                           FileDispositionInformation requests with
                           DeleteFile set to FALSE should unschedule
                           the delete. See
                           http://www.osronline.com/article.cfm?article=245. Currently,
                           we are deleting the file immediately. I
                           guess this is a FIXME. */

                        //in_uint32_le(in, delete_on_close);

                        /* Make sure we close the file before
                           unlinking it. Not doing so would trigger
                           silly-delete if using NFS, which might fail
                           on FAT floppies, for example. */
                        disk_close(handle);

                        if ((pfinfo->flags_and_attributes & FILE_DIRECTORY_FILE))       // remove a directory
                        {
                                if (rmdir(pfinfo->path) < 0)
                                        return STATUS_ACCESS_DENIED;
                        }
                        else if (unlink(pfinfo->path) < 0)      // unlink a file
                                return STATUS_ACCESS_DENIED;

                        break;

                case FileAllocationInformation:
                        /* Fall through to FileEndOfFileInformation,
                           which uses ftrunc. This is like Samba with
                           "strict allocation = false", and means that
                           we won't detect out-of-quota errors, for
                           example. */

                case FileEndOfFileInformation:
                        in_uint8s(in, 28);      /* unknown */
                        in_uint32_le(in, length);       /* file size */

                        /* prevents start of writing if not enough space left on device */
                        if (STATFS_FN(g_rdpdr_device[pfinfo->device_id].local_path, &stat_fs) == 0)
                                if (stat_fs.f_bsize * stat_fs.f_bfree < length)
                                        return STATUS_DISK_FULL;

                        if (ftruncate_growable(handle, length) != 0)
                        {
                                return STATUS_DISK_FULL;
                        }

                        break;
                default:

                        unimpl("IRP Set File Information class: 0x%x\n", info_class);
                        return STATUS_INVALID_PARAMETER;
        }
        return STATUS_SUCCESS;
}

static FsInfoType *
FsVolumeInfo(char *fpath)
{

#ifdef HAVE_MNTENT_H
        FILE *fdfs;
        struct mntent *e;
        static FsInfoType info;

        /* initialize */
        memset(&info, 0, sizeof(info));
        strcpy(info.label, "RDESKTOP");
        strcpy(info.type, "RDPFS");

        fdfs = setmntent(MNTENT_PATH, "r");
        if (!fdfs)
                return &info;

        while ((e = getmntent(fdfs)))
        {
                if (strncmp(fpath, e->mnt_dir, strlen(fpath)) == 0)
                {
                        strcpy(info.type, e->mnt_type);
                        strcpy(info.name, e->mnt_fsname);
                        if (strstr(e->mnt_opts, "vfat") || strstr(e->mnt_opts, "iso9660"))
                        {
                                int fd = open(e->mnt_fsname, O_RDONLY);
                                if (fd >= 0)
                                {
                                        unsigned char buf[512];
                                        memset(buf, 0, sizeof(buf));
                                        if (strstr(e->mnt_opts, "vfat"))
                                                 /*FAT*/
                                        {
                                                strcpy(info.type, "vfat");
                                                read(fd, buf, sizeof(buf));
                                                info.serial =
                                                        (buf[42] << 24) + (buf[41] << 16) +
                                                        (buf[40] << 8) + buf[39];
                                                strncpy(info.label, buf + 43, 10);
                                                info.label[10] = '\0';
                                        }
                                        else if (lseek(fd, 32767, SEEK_SET) >= 0)       /* ISO9660 */
                                        {
                                                read(fd, buf, sizeof(buf));
                                                strncpy(info.label, buf + 41, 32);
                                                info.label[32] = '\0';
                                                //info.Serial = (buf[128]<<24)+(buf[127]<<16)+(buf[126]<<8)+buf[125];
                                        }
                                        close(fd);
                                }
                        }
                }
        }
        endmntent(fdfs);
#else
        static FsInfoType info;

        /* initialize */
        memset(&info, 0, sizeof(info));
        strcpy(info.label, "RDESKTOP");
        strcpy(info.type, "RDPFS");

#endif
        return &info;
}


NTSTATUS
disk_query_volume_information(NTHANDLE handle, uint32 info_class, STREAM out)
{
        struct STATFS_T stat_fs;
        struct fileinfo *pfinfo;
        FsInfoType *fsinfo;

        pfinfo = &(g_fileinfo[handle]);

        if (STATFS_FN(pfinfo->path, &stat_fs) != 0)
        {
                perror("statfs");
                return STATUS_ACCESS_DENIED;
        }

        fsinfo = FsVolumeInfo(pfinfo->path);

        switch (info_class)
        {
                case FileFsVolumeInformation:

                        out_uint32_le(out, 0);  /* volume creation time low */
                        out_uint32_le(out, 0);  /* volume creation time high */
                        out_uint32_le(out, fsinfo->serial);     /* serial */

                        out_uint32_le(out, 2 * strlen(fsinfo->label));  /* length of string */

                        out_uint8(out, 0);      /* support objects? */
                        rdp_out_unistr(out, fsinfo->label, 2 * strlen(fsinfo->label) - 2);
                        break;

                case FileFsSizeInformation:

                        out_uint32_le(out, stat_fs.f_blocks);   /* Total allocation units low */
                        out_uint32_le(out, 0);  /* Total allocation high units */
                        out_uint32_le(out, stat_fs.f_bfree);    /* Available allocation units */
                        out_uint32_le(out, 0);  /* Available allowcation units */
                        out_uint32_le(out, stat_fs.f_bsize / 0x200);    /* Sectors per allocation unit */
                        out_uint32_le(out, 0x200);      /* Bytes per sector */
                        break;

                case FileFsAttributeInformation:

                        out_uint32_le(out, FS_CASE_SENSITIVE | FS_CASE_IS_PRESERVED);   /* fs attributes */
                        out_uint32_le(out, F_NAMELEN(stat_fs)); /* max length of filename */

                        out_uint32_le(out, 2 * strlen(fsinfo->type));   /* length of fs_type */
                        rdp_out_unistr(out, fsinfo->type, 2 * strlen(fsinfo->type) - 2);
                        break;

                case FileFsLabelInformation:
                case FileFsDeviceInformation:
                case FileFsControlInformation:
                case FileFsFullSizeInformation:
                case FileFsObjectIdInformation:
                case FileFsMaximumInformation:

                default:

                        unimpl("IRP Query Volume Information class: 0x%x\n", info_class);
                        return STATUS_INVALID_PARAMETER;
        }
        return STATUS_SUCCESS;
}

NTSTATUS
disk_query_directory(NTHANDLE handle, uint32 info_class, char *pattern, STREAM out)
{
        uint32 file_attributes, ft_low, ft_high;
        char *dirname, fullpath[256];
        DIR *pdir;
        struct dirent *pdirent;
        struct stat fstat;
        struct fileinfo *pfinfo;

        pfinfo = &(g_fileinfo[handle]);
        pdir = pfinfo->pdir;
        dirname = pfinfo->path;
        file_attributes = 0;

        switch (info_class)
        {
                case FileBothDirectoryInformation:

                        // If a search pattern is received, remember this pattern, and restart search
                        if (pattern[0] != 0)
                        {
                                strncpy(pfinfo->pattern, 1 + strrchr(pattern, '/'), 64);
                                rewinddir(pdir);
                        }

                        // find next dirent matching pattern
                        pdirent = readdir(pdir);
                        while (pdirent && fnmatch(pfinfo->pattern, pdirent->d_name, 0) != 0)
                                pdirent = readdir(pdir);

                        if (pdirent == NULL)
                                return STATUS_NO_MORE_FILES;

                        // Get information for directory entry
                        sprintf(fullpath, "%s/%s", dirname, pdirent->d_name);

                        if (stat(fullpath, &fstat))
                        {
                                switch (errno)
                                {
                                        case ENOENT:
                                        case ELOOP:
                                        case EACCES:
                                                /* These are non-fatal errors. */
                                                memset(&fstat, 0, sizeof(fstat));
                                                break;
                                        default:
                                                /* Fatal error. By returning STATUS_NO_SUCH_FILE, 
                                                   the directory list operation will be aborted */
                                                perror(fullpath);
                                                out_uint8(out, 0);
                                                return STATUS_NO_SUCH_FILE;
                                }
                        }

                        if (S_ISDIR(fstat.st_mode))
                                file_attributes |= FILE_ATTRIBUTE_DIRECTORY;
                        if (pdirent->d_name[0] == '.')
                                file_attributes |= FILE_ATTRIBUTE_HIDDEN;
                        if (!file_attributes)
                                file_attributes |= FILE_ATTRIBUTE_NORMAL;
                        if (!(fstat.st_mode & S_IWUSR))
                                file_attributes |= FILE_ATTRIBUTE_READONLY;

                        // Return requested information
                        out_uint8s(out, 8);     //unknown zero

                        seconds_since_1970_to_filetime(get_create_time(&fstat), &ft_high, &ft_low);
                        out_uint32_le(out, ft_low);     // create time
                        out_uint32_le(out, ft_high);

                        seconds_since_1970_to_filetime(fstat.st_atime, &ft_high, &ft_low);
                        out_uint32_le(out, ft_low);     //last_access_time
                        out_uint32_le(out, ft_high);

                        seconds_since_1970_to_filetime(fstat.st_mtime, &ft_high, &ft_low);
                        out_uint32_le(out, ft_low);     //last_write_time
                        out_uint32_le(out, ft_high);

                        seconds_since_1970_to_filetime(fstat.st_ctime, &ft_high, &ft_low);
                        out_uint32_le(out, ft_low);     //change_write_time
                        out_uint32_le(out, ft_high);

                        out_uint32_le(out, fstat.st_size);      //filesize low
                        out_uint32_le(out, 0);  //filesize high
                        out_uint32_le(out, fstat.st_size);      //filesize low
                        out_uint32_le(out, 0);  //filesize high
                        out_uint32_le(out, file_attributes);
                        out_uint8(out, 2 * strlen(pdirent->d_name) + 2);        //unicode length
                        out_uint8s(out, 7);     //pad?
                        out_uint8(out, 0);      //8.3 file length
                        out_uint8s(out, 2 * 12);        //8.3 unicode length
                        rdp_out_unistr(out, pdirent->d_name, 2 * strlen(pdirent->d_name));
                        break;

                default:
                        /* FIXME: Support FileDirectoryInformation,
                           FileFullDirectoryInformation, and
                           FileNamesInformation */

                        unimpl("IRP Query Directory sub: 0x%x\n", info_class);
                        return STATUS_INVALID_PARAMETER;
        }

        return STATUS_SUCCESS;
}


static NTSTATUS
disk_device_control(NTHANDLE handle, uint32 request, STREAM in, STREAM out)
{
        if (((request >> 16) != 20) || ((request >> 16) != 9))
                return STATUS_INVALID_PARAMETER;

        /* extract operation */
        request >>= 2;
        request &= 0xfff;

        printf("DISK IOCTL %d\n", request);

        switch (request)
        {
                case 25:        // ?
                case 42:        // ?
                default:
                        unimpl("DISK IOCTL %d\n", request);
                        return STATUS_INVALID_PARAMETER;
        }

        return STATUS_SUCCESS;
}

DEVICE_FNS disk_fns = {
        disk_create,
        disk_close,
        disk_read,
        disk_write,
        disk_device_control     /* device_control */
};