server/file.c

   1 /*
   2  * Server-side file management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <fcntl.h>
  26 #include <stdarg.h>
  27 #include <stdio.h>
  28 #include <string.h>
  29 #include <stdlib.h>
  30 #include <errno.h>
  31 #ifdef HAVE_SYS_ERRNO_H
  32 #include <sys/errno.h>
  33 #endif
  34 #include <sys/stat.h>
  35 #include <sys/time.h>
  36 #include <sys/types.h>
  37 #include <time.h>
  38 #include <unistd.h>
  39 #ifdef HAVE_UTIME_H
  40 #include <utime.h>
  41 #endif
  42 #ifdef HAVE_POLL_H
  43 #include <poll.h>
  44 #endif
  45
  46 #include "ntstatus.h"
  47 #define WIN32_NO_STATUS
  48 #include "windef.h"
  49 #include "winternl.h"
  50
  51 #include "file.h"
  52 #include "handle.h"
  53 #include "thread.h"
  54 #include "request.h"
  55 #include "process.h"
  56 #include "security.h"
  57
  58 struct file
  59 {
  60     struct object       obj;        /* object header */
  61     struct fd          *fd;         /* file descriptor for this file */
  62     unsigned int        access;     /* file access (FILE_READ_DATA etc.) */
  63     mode_t              mode;       /* file stat.st_mode */
  64     uid_t               uid;        /* file stat.st_uid */
  65 };
  66
  67 static unsigned int generic_file_map_access( unsigned int access );
  68
  69 static void file_dump( struct object *obj, int verbose );
  70 static struct fd *file_get_fd( struct object *obj );
  71 static struct security_descriptor *file_get_sd( struct object *obj );
  72 static int file_set_sd( struct object *obj, const struct security_descriptor *sd, unsigned int set_info );
  73 static void file_destroy( struct object *obj );
  74
  75 static int file_get_poll_events( struct fd *fd );
  76 static void file_flush( struct fd *fd, struct event **event );
  77 static enum server_fd_type file_get_fd_type( struct fd *fd );
  78
  79 static const struct object_ops file_ops =
  80 {
  81     sizeof(struct file),          /* size */
  82     file_dump,                    /* dump */
  83     no_get_type,                  /* get_type */
  84     add_queue,                    /* add_queue */
  85     remove_queue,                 /* remove_queue */
  86     default_fd_signaled,          /* signaled */
  87     no_satisfied,                 /* satisfied */
  88     no_signal,                    /* signal */
  89     file_get_fd,                  /* get_fd */
  90     default_fd_map_access,        /* map_access */
  91     file_get_sd,                  /* get_sd */
  92     file_set_sd,                  /* set_sd */
  93     no_lookup_name,               /* lookup_name */
  94     no_open_file,                 /* open_file */
  95     fd_close_handle,              /* close_handle */
  96     file_destroy                  /* destroy */
  97 };
  98
  99 static const struct fd_ops file_fd_ops =
 100 {
 101     file_get_poll_events,         /* get_poll_events */
 102     default_poll_event,           /* poll_event */
 103     file_flush,                   /* flush */
 104     file_get_fd_type,             /* get_fd_type */
 105     default_fd_ioctl,             /* ioctl */
 106     default_fd_queue_async,       /* queue_async */
 107     default_fd_reselect_async,    /* reselect_async */
 108     default_fd_cancel_async       /* cancel_async */
 109 };
 110
 111 static inline int is_overlapped( const struct file *file )
 112 {
 113     return !(get_fd_options( file->fd ) & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
 114 }
 115
 116 /* create a file from a file descriptor */
 117 /* if the function fails the fd is closed */
 118 struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing )
 119 {
 120     struct file *file;
 121     struct stat st;
 122
 123     if (fstat( fd, &st ) == -1)
 124     {
 125         file_set_error();
 126         return NULL;
 127     }
 128
 129     if ((file = alloc_object( &file_ops )))
 130     {
 131         file->mode = st.st_mode;
 132         file->access = default_fd_map_access( &file->obj, access );
 133         if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj,
 134                                               FILE_SYNCHRONOUS_IO_NONALERT )))
 135         {
 136             release_object( file );
 137             return NULL;
 138         }
 139         allow_fd_caching( file->fd );
 140     }
 141     return file;
 142 }
 143
 144 static struct object *create_file_obj( struct fd *fd, unsigned int access, mode_t mode )
 145 {
 146     struct file *file = alloc_object( &file_ops );
 147
 148     if (!file) return NULL;
 149     file->access  = access;
 150     file->mode    = mode;
 151     file->uid     = ~(uid_t)0;
 152     file->fd      = fd;
 153     grab_object( fd );
 154     set_fd_user( fd, &file_fd_ops, &file->obj );
 155     return &file->obj;
 156 }
 157
 158 static struct object *create_file( struct fd *root, const char *nameptr, data_size_t len,
 159                                    unsigned int access, unsigned int sharing, int create,
 160                                    unsigned int options, unsigned int attrs,
 161                                    const struct security_descriptor *sd )
 162 {
 163     struct object *obj = NULL;
 164     struct fd *fd;
 165     int flags;
 166     char *name;
 167     mode_t mode;
 168
 169     if (!len || ((nameptr[0] == '/') ^ !root))
 170     {
 171         set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
 172         return NULL;
 173     }
 174     if (!(name = mem_alloc( len + 1 ))) return NULL;
 175     memcpy( name, nameptr, len );
 176     name[len] = 0;
 177
 178     switch(create)
 179     {
 180     case FILE_CREATE:       flags = O_CREAT | O_EXCL; break;
 181     case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */
 182     case FILE_SUPERSEDE:    flags = O_CREAT | O_TRUNC; break;
 183     case FILE_OPEN:         flags = 0; break;
 184     case FILE_OPEN_IF:      flags = O_CREAT; break;
 185     case FILE_OVERWRITE:    flags = O_TRUNC; break;
 186     default:                set_error( STATUS_INVALID_PARAMETER ); goto done;
 187     }
 188
 189     if (sd)
 190     {
 191         const SID *owner = sd_get_owner( sd );
 192         if (!owner)
 193             owner = token_get_user( current->process->token );
 194         mode = sd_to_mode( sd, owner );
 195     }
 196     else
 197         mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
 198
 199     if (len >= 4 &&
 200         (!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
 201     {
 202         if (mode & S_IRUSR)
 203             mode |= S_IXUSR;
 204         if (mode & S_IRGRP)
 205             mode |= S_IXGRP;
 206         if (mode & S_IROTH)
 207             mode |= S_IXOTH;
 208     }
 209
 210     access = generic_file_map_access( access );
 211
 212     /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
 213     fd = open_fd( root, name, flags | O_NONBLOCK | O_LARGEFILE, &mode, access, sharing, options );
 214     if (!fd) goto done;
 215
 216     if (S_ISDIR(mode))
 217         obj = create_dir_obj( fd, access, mode );
 218     else if (S_ISCHR(mode) && is_serial_fd( fd ))
 219         obj = create_serial( fd );
 220     else
 221         obj = create_file_obj( fd, access, mode );
 222
 223     release_object( fd );
 224
 225 done:
 226     free( name );
 227     return obj;
 228 }
 229
 230 /* check if two file objects point to the same file */
 231 int is_same_file( struct file *file1, struct file *file2 )
 232 {
 233     return is_same_file_fd( file1->fd, file2->fd );
 234 }
 235
 236 static void file_dump( struct object *obj, int verbose )
 237 {
 238     struct file *file = (struct file *)obj;
 239     assert( obj->ops == &file_ops );
 240     fprintf( stderr, "File fd=%p\n", file->fd );
 241 }
 242
 243 static int file_get_poll_events( struct fd *fd )
 244 {
 245     struct file *file = get_fd_user( fd );
 246     int events = 0;
 247     assert( file->obj.ops == &file_ops );
 248     if (file->access & FILE_UNIX_READ_ACCESS) events |= POLLIN;
 249     if (file->access & FILE_UNIX_WRITE_ACCESS) events |= POLLOUT;
 250     return events;
 251 }
 252
 253 static void file_flush( struct fd *fd, struct event **event )
 254 {
 255     int unix_fd = get_unix_fd( fd );
 256     if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error();
 257 }
 258
 259 static enum server_fd_type file_get_fd_type( struct fd *fd )
 260 {
 261     struct file *file = get_fd_user( fd );
 262
 263     if (S_ISREG(file->mode) || S_ISBLK(file->mode)) return FD_TYPE_FILE;
 264     if (S_ISDIR(file->mode)) return FD_TYPE_DIR;
 265     return FD_TYPE_CHAR;
 266 }
 267
 268 static struct fd *file_get_fd( struct object *obj )
 269 {
 270     struct file *file = (struct file *)obj;
 271     assert( obj->ops == &file_ops );
 272     return (struct fd *)grab_object( file->fd );
 273 }
 274
 275 static unsigned int generic_file_map_access( unsigned int access )
 276 {
 277     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 278     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 279     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 280     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 281     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 282 }
 283
 284 struct security_descriptor *mode_to_sd( mode_t mode, const SID *user, const SID *group )
 285 {
 286     struct security_descriptor *sd;
 287     size_t dacl_size;
 288     ACE_HEADER *current_ace;
 289     ACCESS_ALLOWED_ACE *aaa;
 290     ACL *dacl;
 291     SID *sid;
 292     char *ptr;
 293     const SID *world_sid = security_world_sid;
 294     const SID *local_system_sid = security_local_system_sid;
 295
 296     dacl_size = sizeof(ACL) + FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 297         FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]);
 298     if (mode & S_IRWXU)
 299         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 300             FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 301     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 302         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 303         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 304         dacl_size += FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) +
 305             FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 306     if (mode & S_IRWXO)
 307         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 308             FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]);
 309
 310     sd = mem_alloc( sizeof(struct security_descriptor) +
 311                     FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) +
 312                     FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]) +
 313                     dacl_size );
 314     if (!sd) return sd;
 315
 316     sd->control = SE_DACL_PRESENT;
 317     sd->owner_len = FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 318     sd->group_len = FIELD_OFFSET(SID, SubAuthority[group->SubAuthorityCount]);
 319     sd->sacl_len = 0;
 320     sd->dacl_len = dacl_size;
 321
 322     ptr = (char *)(sd + 1);
 323     memcpy( ptr, user, sd->owner_len );
 324     ptr += sd->owner_len;
 325     memcpy( ptr, group, sd->group_len );
 326     ptr += sd->group_len;
 327
 328     dacl = (ACL *)ptr;
 329     dacl->AclRevision = ACL_REVISION;
 330     dacl->Sbz1 = 0;
 331     dacl->AclSize = dacl_size;
 332     dacl->AceCount = 1 + (mode & S_IRWXU ? 1 : 0) + (mode & S_IRWXO ? 1 : 0);
 333     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 334         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 335         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 336         dacl->AceCount++;
 337     dacl->Sbz2 = 0;
 338
 339     /* always give FILE_ALL_ACCESS for Local System */
 340     aaa = (ACCESS_ALLOWED_ACE *)(dacl + 1);
 341     current_ace = &aaa->Header;
 342     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 343     aaa->Header.AceFlags = 0;
 344     aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 345         FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]);
 346     aaa->Mask = FILE_ALL_ACCESS;
 347     sid = (SID *)&aaa->SidStart;
 348     memcpy( sid, local_system_sid, FIELD_OFFSET(SID, SubAuthority[local_system_sid->SubAuthorityCount]) );
 349
 350     if (mode & S_IRWXU)
 351     {
 352         /* appropriate access rights for the user */
 353         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 354         current_ace = &aaa->Header;
 355         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 356         aaa->Header.AceFlags = 0;
 357         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 358                               FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 359         aaa->Mask = WRITE_DAC | WRITE_OWNER;
 360         if (mode & S_IRUSR)
 361             aaa->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 362         if (mode & S_IWUSR)
 363             aaa->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 364         sid = (SID *)&aaa->SidStart;
 365         memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 366     }
 367     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 368         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 369         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 370     {
 371         /* deny just in case the user is a member of the group */
 372         ACCESS_DENIED_ACE *ada = (ACCESS_DENIED_ACE *)ace_next( current_ace );
 373         current_ace = &ada->Header;
 374         ada->Header.AceType = ACCESS_DENIED_ACE_TYPE;
 375         ada->Header.AceFlags = 0;
 376         ada->Header.AceSize = FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) +
 377                               FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]);
 378         ada->Mask = 0;
 379         if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
 380             ada->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 381         if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IROTH)))
 382             ada->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 383         ada->Mask &= ~STANDARD_RIGHTS_ALL; /* never deny standard rights */
 384         sid = (SID *)&ada->SidStart;
 385         memcpy( sid, user, FIELD_OFFSET(SID, SubAuthority[user->SubAuthorityCount]) );
 386     }
 387     if (mode & S_IRWXO)
 388     {
 389         /* appropriate access rights for Everyone */
 390         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 391         current_ace = &aaa->Header;
 392         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 393         aaa->Header.AceFlags = 0;
 394         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 395                              FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]);
 396         aaa->Mask = 0;
 397         if (mode & S_IROTH)
 398             aaa->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 399         if (mode & S_IWOTH)
 400             aaa->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 401         sid = (SID *)&aaa->SidStart;
 402         memcpy( sid, world_sid, FIELD_OFFSET(SID, SubAuthority[world_sid->SubAuthorityCount]) );
 403     }
 404
 405     return sd;
 406 }
 407
 408 static struct security_descriptor *file_get_sd( struct object *obj )
 409 {
 410     struct file *file = (struct file *)obj;
 411     struct stat st;
 412     int unix_fd;
 413     struct security_descriptor *sd;
 414
 415     assert( obj->ops == &file_ops );
 416
 417     unix_fd = get_file_unix_fd( file );
 418
 419     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1)
 420         return obj->sd;
 421
 422     /* mode and uid the same? if so, no need to re-generate security descriptor */
 423     if (obj->sd && (st.st_mode & (S_IRWXU|S_IRWXO)) == (file->mode & (S_IRWXU|S_IRWXO)) &&
 424         (st.st_uid == file->uid))
 425         return obj->sd;
 426
 427     sd = mode_to_sd( st.st_mode,
 428                      security_unix_uid_to_sid( st.st_uid ),
 429                      token_get_primary_group( current->process->token ));
 430     if (!sd) return obj->sd;
 431
 432     file->mode = st.st_mode;
 433     file->uid = st.st_uid;
 434     free( obj->sd );
 435     obj->sd = sd;
 436     return sd;
 437 }
 438
 439 static mode_t file_access_to_mode( unsigned int access )
 440 {
 441     mode_t mode = 0;
 442
 443     access = generic_file_map_access( access );
 444     if (access & FILE_READ_DATA)  mode |= 4;
 445     if (access & FILE_WRITE_DATA) mode |= 2;
 446     if (access & FILE_EXECUTE)    mode |= 1;
 447     return mode;
 448 }
 449
 450 mode_t sd_to_mode( const struct security_descriptor *sd, const SID *owner )
 451 {
 452     mode_t new_mode = 0;
 453     mode_t denied_mode = 0;
 454     mode_t mode;
 455     int present;
 456     const ACL *dacl = sd_get_dacl( sd, &present );
 457     const SID *user = token_get_user( current->process->token );
 458     if (present && dacl)
 459     {
 460         const ACE_HEADER *ace = (const ACE_HEADER *)(dacl + 1);
 461         ULONG i;
 462         for (i = 0; i < dacl->AceCount; i++, ace = ace_next( ace ))
 463         {
 464             const ACCESS_ALLOWED_ACE *aa_ace;
 465             const ACCESS_DENIED_ACE *ad_ace;
 466             const SID *sid;
 467
 468             if (ace->AceFlags & INHERIT_ONLY_ACE) continue;
 469
 470             switch (ace->AceType)
 471             {
 472                 case ACCESS_DENIED_ACE_TYPE:
 473                     ad_ace = (const ACCESS_DENIED_ACE *)ace;
 474                     sid = (const SID *)&ad_ace->SidStart;
 475                     mode = file_access_to_mode( ad_ace->Mask );
 476                     if (security_equal_sid( sid, security_world_sid ))
 477                     {
 478                         denied_mode |= (mode << 6) | (mode << 3) | mode; /* all */
 479                     }
 480                     else if (security_equal_sid( sid, owner ))
 481                     {
 482                         denied_mode |= (mode << 6);  /* user only */
 483                     }
 484                     else if ((security_equal_sid( user, owner ) &&
 485                               token_sid_present( current->process->token, sid, TRUE )))
 486                     {
 487                         denied_mode |= (mode << 6) | (mode << 3);  /* user + group */
 488                     }
 489                     break;
 490                 case ACCESS_ALLOWED_ACE_TYPE:
 491                     aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
 492                     sid = (const SID *)&aa_ace->SidStart;
 493                     mode = file_access_to_mode( aa_ace->Mask );
 494                     if (security_equal_sid( sid, security_world_sid ))
 495                     {
 496                         new_mode |= (mode << 6) | (mode << 3) | mode;  /* all */
 497                     }
 498                     else if (security_equal_sid( sid, owner ))
 499                     {
 500                         new_mode |= (mode << 6);  /* user only */
 501                     }
 502                     else if ((security_equal_sid( user, owner ) &&
 503                               token_sid_present( current->process->token, sid, FALSE )))
 504                     {
 505                         new_mode |= (mode << 6) | (mode << 3);  /* user + group */
 506                     }
 507                     break;
 508             }
 509         }
 510     }
 511     else
 512         /* no ACL means full access rights to anyone */
 513         new_mode = S_IRWXU | S_IRWXG | S_IRWXO;
 514
 515     return new_mode & ~denied_mode;
 516 }
 517
 518 static int file_set_sd( struct object *obj, const struct security_descriptor *sd,
 519                         unsigned int set_info )
 520 {
 521     struct file *file = (struct file *)obj;
 522     const SID *owner;
 523     struct stat st;
 524     mode_t mode;
 525     int unix_fd;
 526
 527     assert( obj->ops == &file_ops );
 528
 529     unix_fd = get_file_unix_fd( file );
 530
 531     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
 532
 533     if (set_info & OWNER_SECURITY_INFORMATION)
 534     {
 535         owner = sd_get_owner( sd );
 536         if (!owner)
 537         {
 538             set_error( STATUS_INVALID_SECURITY_DESCR );
 539             return 0;
 540         }
 541         if (!obj->sd || !security_equal_sid( owner, sd_get_owner( obj->sd ) ))
 542         {
 543             /* FIXME: get Unix uid and call fchown */
 544         }
 545     }
 546     else if (obj->sd)
 547         owner = sd_get_owner( obj->sd );
 548     else
 549         owner = token_get_user( current->process->token );
 550
 551     /* group and sacl not supported */
 552
 553     if (set_info & DACL_SECURITY_INFORMATION)
 554     {
 555         /* keep the bits that we don't map to access rights in the ACL */
 556         mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX);
 557         mode |= sd_to_mode( sd, owner );
 558
 559         if (((st.st_mode ^ mode) & (S_IRWXU|S_IRWXG|S_IRWXO)) && fchmod( unix_fd, mode ) == -1)
 560         {
 561             file_set_error();
 562             return 0;
 563         }
 564     }
 565     return 1;
 566 }
 567
 568 static void file_destroy( struct object *obj )
 569 {
 570     struct file *file = (struct file *)obj;
 571     assert( obj->ops == &file_ops );
 572
 573     if (file->fd) release_object( file->fd );
 574 }
 575
 576 /* set the last error depending on errno */
 577 void file_set_error(void)
 578 {
 579     switch (errno)
 580     {
 581     case ETXTBSY:
 582     case EAGAIN:    set_error( STATUS_SHARING_VIOLATION ); break;
 583     case EBADF:     set_error( STATUS_INVALID_HANDLE ); break;
 584     case ENOSPC:    set_error( STATUS_DISK_FULL ); break;
 585     case EACCES:
 586     case ESRCH:
 587     case EROFS:
 588     case EPERM:     set_error( STATUS_ACCESS_DENIED ); break;
 589     case EBUSY:     set_error( STATUS_FILE_LOCK_CONFLICT ); break;
 590     case ENOENT:    set_error( STATUS_NO_SUCH_FILE ); break;
 591     case EISDIR:    set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
 592     case ENFILE:
 593     case EMFILE:    set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
 594     case EEXIST:    set_error( STATUS_OBJECT_NAME_COLLISION ); break;
 595     case EINVAL:    set_error( STATUS_INVALID_PARAMETER ); break;
 596     case ESPIPE:    set_error( STATUS_ILLEGAL_FUNCTION ); break;
 597     case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
 598     case EIO:       set_error( STATUS_ACCESS_VIOLATION ); break;
 599     case ENOTDIR:   set_error( STATUS_NOT_A_DIRECTORY ); break;
 600     case EFBIG:     set_error( STATUS_SECTION_TOO_BIG ); break;
 601     case ENODEV:    set_error( STATUS_NO_SUCH_DEVICE ); break;
 602     case ENXIO:     set_error( STATUS_NO_SUCH_DEVICE ); break;
 603 #ifdef EOVERFLOW
 604     case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
 605 #endif
 606     default:
 607         perror("wineserver: file_set_error() can't map error");
 608         set_error( STATUS_UNSUCCESSFUL );
 609         break;
 610     }
 611 }
 612
 613 struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
 614 {
 615     return (struct file *)get_handle_obj( process, handle, access, &file_ops );
 616 }
 617
 618 int get_file_unix_fd( struct file *file )
 619 {
 620     return get_unix_fd( file->fd );
 621 }
 622
 623 struct file *grab_file_unless_removable( struct file *file )
 624 {
 625     if (is_fd_removable( file->fd )) return NULL;
 626     return (struct file *)grab_object( file );
 627 }
 628
 629 /* create a file */
 630 DECL_HANDLER(create_file)
 631 {
 632     struct object *file;
 633     struct fd *root_fd = NULL;
 634     const struct object_attributes *objattr = get_req_data();
 635     const struct security_descriptor *sd;
 636     const char *name;
 637     data_size_t name_len;
 638
 639     reply->handle = 0;
 640
 641     if (!objattr_is_valid( objattr, get_req_data_size() ))
 642         return;
 643     /* name is transferred in the unix codepage outside of the objattr structure */
 644     if (objattr->name_len)
 645     {
 646         set_error( STATUS_INVALID_PARAMETER );
 647         return;
 648     }
 649
 650     if (objattr->rootdir)
 651     {
 652         struct dir *root;
 653
 654         if (!(root = get_dir_obj( current->process, objattr->rootdir, 0 ))) return;
 655         root_fd = get_obj_fd( (struct object *)root );
 656         release_object( root );
 657         if (!root_fd) return;
 658     }
 659
 660     sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
 661
 662     name = (const char *)get_req_data() + sizeof(*objattr) + objattr->sd_len;
 663     name_len = get_req_data_size() - sizeof(*objattr) - objattr->sd_len;
 664
 665     reply->handle = 0;
 666     if ((file = create_file( root_fd, name, name_len, req->access, req->sharing,
 667                              req->create, req->options, req->attrs, sd )))
 668     {
 669         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 670         release_object( file );
 671     }
 672     if (root_fd) release_object( root_fd );
 673 }
 674
 675 /* allocate a file handle for a Unix fd */
 676 DECL_HANDLER(alloc_file_handle)
 677 {
 678     struct file *file;
 679     int fd;
 680
 681     reply->handle = 0;
 682     if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
 683     {
 684         set_error( STATUS_INVALID_HANDLE );
 685         return;
 686     }
 687     if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
 688     {
 689         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 690         release_object( file );
 691     }
 692 }
 693
 694 /* lock a region of a file */
 695 DECL_HANDLER(lock_file)
 696 {
 697     struct file *file;
 698
 699     if ((file = get_file_obj( current->process, req->handle, 0 )))
 700     {
 701         reply->handle = lock_fd( file->fd, req->offset, req->count, req->shared, req->wait );
 702         reply->overlapped = is_overlapped( file );
 703         release_object( file );
 704     }
 705 }
 706
 707 /* unlock a region of a file */
 708 DECL_HANDLER(unlock_file)
 709 {
 710     struct file *file;
 711
 712     if ((file = get_file_obj( current->process, req->handle, 0 )))
 713     {
 714         unlock_fd( file->fd, req->offset, req->count );
 715         release_object( file );
 716     }
 717 }