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 #include <sys/stat.h>
  32 #include <sys/time.h>
  33 #include <sys/types.h>
  34 #include <time.h>
  35 #include <unistd.h>
  36 #ifdef HAVE_UTIME_H
  37 #include <utime.h>
  38 #endif
  39 #ifdef HAVE_POLL_H
  40 #include <poll.h>
  41 #endif
  42
  43 #include "ntstatus.h"
  44 #define WIN32_NO_STATUS
  45 #include "windef.h"
  46 #include "winternl.h"
  47
  48 #include "file.h"
  49 #include "handle.h"
  50 #include "thread.h"
  51 #include "request.h"
  52 #include "process.h"
  53 #include "security.h"
  54
  55 struct file
  56 {
  57     struct object       obj;        /* object header */
  58     struct fd          *fd;         /* file descriptor for this file */
  59     unsigned int        access;     /* file access (FILE_READ_DATA etc.) */
  60     mode_t              mode;       /* file stat.st_mode */
  61     uid_t               uid;        /* file stat.st_uid */
  62 };
  63
  64 static unsigned int generic_file_map_access( unsigned int access );
  65
  66 static void file_dump( struct object *obj, int verbose );
  67 static struct fd *file_get_fd( struct object *obj );
  68 static struct security_descriptor *file_get_sd( struct object *obj );
  69 static int file_set_sd( struct object *obj, const struct security_descriptor *sd, unsigned int set_info );
  70 static void file_destroy( struct object *obj );
  71
  72 static int file_get_poll_events( struct fd *fd );
  73 static void file_flush( struct fd *fd, struct event **event );
  74 static enum server_fd_type file_get_fd_type( struct fd *fd );
  75
  76 static const struct object_ops file_ops =
  77 {
  78     sizeof(struct file),          /* size */
  79     file_dump,                    /* dump */
  80     no_get_type,                  /* get_type */
  81     add_queue,                    /* add_queue */
  82     remove_queue,                 /* remove_queue */
  83     default_fd_signaled,          /* signaled */
  84     no_satisfied,                 /* satisfied */
  85     no_signal,                    /* signal */
  86     file_get_fd,                  /* get_fd */
  87     default_fd_map_access,        /* map_access */
  88     file_get_sd,                  /* get_sd */
  89     file_set_sd,                  /* set_sd */
  90     no_lookup_name,               /* lookup_name */
  91     no_open_file,                 /* open_file */
  92     fd_close_handle,              /* close_handle */
  93     file_destroy                  /* destroy */
  94 };
  95
  96 static const struct fd_ops file_fd_ops =
  97 {
  98     file_get_poll_events,         /* get_poll_events */
  99     default_poll_event,           /* poll_event */
 100     file_flush,                   /* flush */
 101     file_get_fd_type,             /* get_fd_type */
 102     default_fd_ioctl,             /* ioctl */
 103     default_fd_queue_async,       /* queue_async */
 104     default_fd_reselect_async,    /* reselect_async */
 105     default_fd_cancel_async       /* cancel_async */
 106 };
 107
 108 static inline int is_overlapped( const struct file *file )
 109 {
 110     return !(get_fd_options( file->fd ) & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
 111 }
 112
 113 /* create a file from a file descriptor */
 114 /* if the function fails the fd is closed */
 115 struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing )
 116 {
 117     struct file *file;
 118     struct stat st;
 119
 120     if (fstat( fd, &st ) == -1)
 121     {
 122         file_set_error();
 123         return NULL;
 124     }
 125
 126     if ((file = alloc_object( &file_ops )))
 127     {
 128         file->mode = st.st_mode;
 129         file->access = default_fd_map_access( &file->obj, access );
 130         if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj,
 131                                               FILE_SYNCHRONOUS_IO_NONALERT )))
 132         {
 133             release_object( file );
 134             return NULL;
 135         }
 136         allow_fd_caching( file->fd );
 137     }
 138     return file;
 139 }
 140
 141 /* create a file by duplicating an fd object */
 142 struct file *create_file_for_fd_obj( struct fd *fd, unsigned int access, unsigned int sharing )
 143 {
 144     struct file *file;
 145     struct stat st;
 146
 147     if (fstat( get_unix_fd(fd), &st ) == -1)
 148     {
 149         file_set_error();
 150         return NULL;
 151     }
 152
 153     if ((file = alloc_object( &file_ops )))
 154     {
 155         file->mode = st.st_mode;
 156         file->access = default_fd_map_access( &file->obj, access );
 157         if (!(file->fd = dup_fd_object( fd, access, sharing, FILE_SYNCHRONOUS_IO_NONALERT )))
 158         {
 159             release_object( file );
 160             return NULL;
 161         }
 162         set_fd_user( file->fd, &file_fd_ops, &file->obj );
 163     }
 164     return file;
 165 }
 166
 167 static struct object *create_file_obj( struct fd *fd, unsigned int access, mode_t mode )
 168 {
 169     struct file *file = alloc_object( &file_ops );
 170
 171     if (!file) return NULL;
 172     file->access  = access;
 173     file->mode    = mode;
 174     file->uid     = ~(uid_t)0;
 175     file->fd      = fd;
 176     grab_object( fd );
 177     set_fd_user( fd, &file_fd_ops, &file->obj );
 178     return &file->obj;
 179 }
 180
 181 static struct object *create_file( struct fd *root, const char *nameptr, data_size_t len,
 182                                    unsigned int access, unsigned int sharing, int create,
 183                                    unsigned int options, unsigned int attrs,
 184                                    const struct security_descriptor *sd )
 185 {
 186     struct object *obj = NULL;
 187     struct fd *fd;
 188     int flags;
 189     char *name;
 190     mode_t mode;
 191
 192     if (!len || ((nameptr[0] == '/') ^ !root))
 193     {
 194         set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
 195         return NULL;
 196     }
 197     if (!(name = mem_alloc( len + 1 ))) return NULL;
 198     memcpy( name, nameptr, len );
 199     name[len] = 0;
 200
 201     switch(create)
 202     {
 203     case FILE_CREATE:       flags = O_CREAT | O_EXCL; break;
 204     case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */
 205                             access |= FILE_WRITE_ATTRIBUTES;
 206     case FILE_SUPERSEDE:    flags = O_CREAT | O_TRUNC; break;
 207     case FILE_OPEN:         flags = 0; break;
 208     case FILE_OPEN_IF:      flags = O_CREAT; break;
 209     case FILE_OVERWRITE:    flags = O_TRUNC;
 210                             access |= FILE_WRITE_ATTRIBUTES; break;
 211     default:                set_error( STATUS_INVALID_PARAMETER ); goto done;
 212     }
 213
 214     if (sd)
 215     {
 216         const SID *owner = sd_get_owner( sd );
 217         if (!owner)
 218             owner = token_get_user( current->process->token );
 219         mode = sd_to_mode( sd, owner );
 220     }
 221     else
 222         mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
 223
 224     if (len >= 4 &&
 225         (!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
 226     {
 227         if (mode & S_IRUSR)
 228             mode |= S_IXUSR;
 229         if (mode & S_IRGRP)
 230             mode |= S_IXGRP;
 231         if (mode & S_IROTH)
 232             mode |= S_IXOTH;
 233     }
 234
 235     access = generic_file_map_access( access );
 236
 237     /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
 238     fd = open_fd( root, name, flags | O_NONBLOCK | O_LARGEFILE, &mode, access, sharing, options );
 239     if (!fd) goto done;
 240
 241     if (S_ISDIR(mode))
 242         obj = create_dir_obj( fd, access, mode );
 243     else if (S_ISCHR(mode) && is_serial_fd( fd ))
 244         obj = create_serial( fd );
 245     else
 246         obj = create_file_obj( fd, access, mode );
 247
 248     release_object( fd );
 249
 250 done:
 251     free( name );
 252     return obj;
 253 }
 254
 255 /* check if two file objects point to the same file */
 256 int is_same_file( struct file *file1, struct file *file2 )
 257 {
 258     return is_same_file_fd( file1->fd, file2->fd );
 259 }
 260
 261 static void file_dump( struct object *obj, int verbose )
 262 {
 263     struct file *file = (struct file *)obj;
 264     assert( obj->ops == &file_ops );
 265     fprintf( stderr, "File fd=%p\n", file->fd );
 266 }
 267
 268 static int file_get_poll_events( struct fd *fd )
 269 {
 270     struct file *file = get_fd_user( fd );
 271     int events = 0;
 272     assert( file->obj.ops == &file_ops );
 273     if (file->access & FILE_UNIX_READ_ACCESS) events |= POLLIN;
 274     if (file->access & FILE_UNIX_WRITE_ACCESS) events |= POLLOUT;
 275     return events;
 276 }
 277
 278 static void file_flush( struct fd *fd, struct event **event )
 279 {
 280     int unix_fd = get_unix_fd( fd );
 281     if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error();
 282 }
 283
 284 static enum server_fd_type file_get_fd_type( struct fd *fd )
 285 {
 286     struct file *file = get_fd_user( fd );
 287
 288     if (S_ISREG(file->mode) || S_ISBLK(file->mode)) return FD_TYPE_FILE;
 289     if (S_ISDIR(file->mode)) return FD_TYPE_DIR;
 290     return FD_TYPE_CHAR;
 291 }
 292
 293 static struct fd *file_get_fd( struct object *obj )
 294 {
 295     struct file *file = (struct file *)obj;
 296     assert( obj->ops == &file_ops );
 297     return (struct fd *)grab_object( file->fd );
 298 }
 299
 300 static unsigned int generic_file_map_access( unsigned int access )
 301 {
 302     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 303     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 304     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 305     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 306     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 307 }
 308
 309 struct security_descriptor *mode_to_sd( mode_t mode, const SID *user, const SID *group )
 310 {
 311     struct security_descriptor *sd;
 312     size_t dacl_size;
 313     ACE_HEADER *current_ace;
 314     ACCESS_ALLOWED_ACE *aaa;
 315     ACL *dacl;
 316     SID *sid;
 317     char *ptr;
 318     const SID *world_sid = security_world_sid;
 319     const SID *local_system_sid = security_local_system_sid;
 320
 321     dacl_size = sizeof(ACL) + FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 322         security_sid_len( local_system_sid );
 323     if (mode & S_IRWXU)
 324         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( user );
 325     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 326         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 327         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 328         dacl_size += FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) + security_sid_len( user );
 329     if (mode & S_IRWXO)
 330         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( world_sid );
 331
 332     sd = mem_alloc( sizeof(struct security_descriptor) +
 333                     security_sid_len( user ) + security_sid_len( group ) +
 334                     dacl_size );
 335     if (!sd) return sd;
 336
 337     sd->control = SE_DACL_PRESENT;
 338     sd->owner_len = security_sid_len( user );
 339     sd->group_len = security_sid_len( group );
 340     sd->sacl_len = 0;
 341     sd->dacl_len = dacl_size;
 342
 343     ptr = (char *)(sd + 1);
 344     memcpy( ptr, user, sd->owner_len );
 345     ptr += sd->owner_len;
 346     memcpy( ptr, group, sd->group_len );
 347     ptr += sd->group_len;
 348
 349     dacl = (ACL *)ptr;
 350     dacl->AclRevision = ACL_REVISION;
 351     dacl->Sbz1 = 0;
 352     dacl->AclSize = dacl_size;
 353     dacl->AceCount = 1 + (mode & S_IRWXU ? 1 : 0) + (mode & S_IRWXO ? 1 : 0);
 354     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 355         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 356         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 357         dacl->AceCount++;
 358     dacl->Sbz2 = 0;
 359
 360     /* always give FILE_ALL_ACCESS for Local System */
 361     aaa = (ACCESS_ALLOWED_ACE *)(dacl + 1);
 362     current_ace = &aaa->Header;
 363     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 364     aaa->Header.AceFlags = 0;
 365     aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( local_system_sid );
 366     aaa->Mask = FILE_ALL_ACCESS;
 367     sid = (SID *)&aaa->SidStart;
 368     memcpy( sid, local_system_sid, security_sid_len( local_system_sid ));
 369
 370     if (mode & S_IRWXU)
 371     {
 372         /* appropriate access rights for the user */
 373         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 374         current_ace = &aaa->Header;
 375         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 376         aaa->Header.AceFlags = 0;
 377         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( user );
 378         aaa->Mask = WRITE_DAC | WRITE_OWNER;
 379         if (mode & S_IRUSR)
 380             aaa->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 381         if (mode & S_IWUSR)
 382             aaa->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 383         sid = (SID *)&aaa->SidStart;
 384         memcpy( sid, user, security_sid_len( user ));
 385     }
 386     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 387         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 388         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 389     {
 390         /* deny just in case the user is a member of the group */
 391         ACCESS_DENIED_ACE *ada = (ACCESS_DENIED_ACE *)ace_next( current_ace );
 392         current_ace = &ada->Header;
 393         ada->Header.AceType = ACCESS_DENIED_ACE_TYPE;
 394         ada->Header.AceFlags = 0;
 395         ada->Header.AceSize = FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) + security_sid_len( user );
 396         ada->Mask = 0;
 397         if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
 398             ada->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 399         if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IROTH)))
 400             ada->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 401         ada->Mask &= ~STANDARD_RIGHTS_ALL; /* never deny standard rights */
 402         sid = (SID *)&ada->SidStart;
 403         memcpy( sid, user, security_sid_len( user ));
 404     }
 405     if (mode & S_IRWXO)
 406     {
 407         /* appropriate access rights for Everyone */
 408         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 409         current_ace = &aaa->Header;
 410         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 411         aaa->Header.AceFlags = 0;
 412         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( world_sid );
 413         aaa->Mask = 0;
 414         if (mode & S_IROTH)
 415             aaa->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 416         if (mode & S_IWOTH)
 417             aaa->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 418         sid = (SID *)&aaa->SidStart;
 419         memcpy( sid, world_sid, security_sid_len( world_sid ));
 420     }
 421
 422     return sd;
 423 }
 424
 425 static struct security_descriptor *file_get_sd( struct object *obj )
 426 {
 427     struct file *file = (struct file *)obj;
 428     struct stat st;
 429     int unix_fd;
 430     struct security_descriptor *sd;
 431
 432     assert( obj->ops == &file_ops );
 433
 434     unix_fd = get_file_unix_fd( file );
 435
 436     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1)
 437         return obj->sd;
 438
 439     /* mode and uid the same? if so, no need to re-generate security descriptor */
 440     if (obj->sd && (st.st_mode & (S_IRWXU|S_IRWXO)) == (file->mode & (S_IRWXU|S_IRWXO)) &&
 441         (st.st_uid == file->uid))
 442         return obj->sd;
 443
 444     sd = mode_to_sd( st.st_mode,
 445                      security_unix_uid_to_sid( st.st_uid ),
 446                      token_get_primary_group( current->process->token ));
 447     if (!sd) return obj->sd;
 448
 449     file->mode = st.st_mode;
 450     file->uid = st.st_uid;
 451     free( obj->sd );
 452     obj->sd = sd;
 453     return sd;
 454 }
 455
 456 static mode_t file_access_to_mode( unsigned int access )
 457 {
 458     mode_t mode = 0;
 459
 460     access = generic_file_map_access( access );
 461     if (access & FILE_READ_DATA)  mode |= 4;
 462     if (access & FILE_WRITE_DATA) mode |= 2;
 463     if (access & FILE_EXECUTE)    mode |= 1;
 464     return mode;
 465 }
 466
 467 mode_t sd_to_mode( const struct security_descriptor *sd, const SID *owner )
 468 {
 469     mode_t new_mode = 0;
 470     mode_t denied_mode = 0;
 471     mode_t mode;
 472     int present;
 473     const ACL *dacl = sd_get_dacl( sd, &present );
 474     const SID *user = token_get_user( current->process->token );
 475     if (present && dacl)
 476     {
 477         const ACE_HEADER *ace = (const ACE_HEADER *)(dacl + 1);
 478         ULONG i;
 479         for (i = 0; i < dacl->AceCount; i++, ace = ace_next( ace ))
 480         {
 481             const ACCESS_ALLOWED_ACE *aa_ace;
 482             const ACCESS_DENIED_ACE *ad_ace;
 483             const SID *sid;
 484
 485             if (ace->AceFlags & INHERIT_ONLY_ACE) continue;
 486
 487             switch (ace->AceType)
 488             {
 489                 case ACCESS_DENIED_ACE_TYPE:
 490                     ad_ace = (const ACCESS_DENIED_ACE *)ace;
 491                     sid = (const SID *)&ad_ace->SidStart;
 492                     mode = file_access_to_mode( ad_ace->Mask );
 493                     if (security_equal_sid( sid, security_world_sid ))
 494                     {
 495                         denied_mode |= (mode << 6) | (mode << 3) | mode; /* all */
 496                     }
 497                     else if ((security_equal_sid( user, owner ) &&
 498                               token_sid_present( current->process->token, sid, TRUE )))
 499                     {
 500                         denied_mode |= (mode << 6) | (mode << 3);  /* user + group */
 501                     }
 502                     else if (security_equal_sid( sid, owner ))
 503                     {
 504                         denied_mode |= (mode << 6);  /* user only */
 505                     }
 506                     break;
 507                 case ACCESS_ALLOWED_ACE_TYPE:
 508                     aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
 509                     sid = (const SID *)&aa_ace->SidStart;
 510                     mode = file_access_to_mode( aa_ace->Mask );
 511                     if (security_equal_sid( sid, security_world_sid ))
 512                     {
 513                         new_mode |= (mode << 6) | (mode << 3) | mode;  /* all */
 514                     }
 515                     else if ((security_equal_sid( user, owner ) &&
 516                               token_sid_present( current->process->token, sid, FALSE )))
 517                     {
 518                         new_mode |= (mode << 6) | (mode << 3);  /* user + group */
 519                     }
 520                     else if (security_equal_sid( sid, owner ))
 521                     {
 522                         new_mode |= (mode << 6);  /* user only */
 523                     }
 524                     break;
 525             }
 526         }
 527     }
 528     else
 529         /* no ACL means full access rights to anyone */
 530         new_mode = S_IRWXU | S_IRWXG | S_IRWXO;
 531
 532     return new_mode & ~denied_mode;
 533 }
 534
 535 static int file_set_sd( struct object *obj, const struct security_descriptor *sd,
 536                         unsigned int set_info )
 537 {
 538     struct file *file = (struct file *)obj;
 539     const SID *owner;
 540     struct stat st;
 541     mode_t mode;
 542     int unix_fd;
 543
 544     assert( obj->ops == &file_ops );
 545
 546     unix_fd = get_file_unix_fd( file );
 547
 548     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
 549
 550     if (set_info & OWNER_SECURITY_INFORMATION)
 551     {
 552         owner = sd_get_owner( sd );
 553         if (!owner)
 554         {
 555             set_error( STATUS_INVALID_SECURITY_DESCR );
 556             return 0;
 557         }
 558         if (!obj->sd || !security_equal_sid( owner, sd_get_owner( obj->sd ) ))
 559         {
 560             /* FIXME: get Unix uid and call fchown */
 561         }
 562     }
 563     else if (obj->sd)
 564         owner = sd_get_owner( obj->sd );
 565     else
 566         owner = token_get_user( current->process->token );
 567
 568     /* group and sacl not supported */
 569
 570     if (set_info & DACL_SECURITY_INFORMATION)
 571     {
 572         /* keep the bits that we don't map to access rights in the ACL */
 573         mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX);
 574         mode |= sd_to_mode( sd, owner );
 575
 576         if (((st.st_mode ^ mode) & (S_IRWXU|S_IRWXG|S_IRWXO)) && fchmod( unix_fd, mode ) == -1)
 577         {
 578             file_set_error();
 579             return 0;
 580         }
 581     }
 582     return 1;
 583 }
 584
 585 static void file_destroy( struct object *obj )
 586 {
 587     struct file *file = (struct file *)obj;
 588     assert( obj->ops == &file_ops );
 589
 590     if (file->fd) release_object( file->fd );
 591 }
 592
 593 /* set the last error depending on errno */
 594 void file_set_error(void)
 595 {
 596     switch (errno)
 597     {
 598     case ETXTBSY:
 599     case EAGAIN:    set_error( STATUS_SHARING_VIOLATION ); break;
 600     case EBADF:     set_error( STATUS_INVALID_HANDLE ); break;
 601     case ENOSPC:    set_error( STATUS_DISK_FULL ); break;
 602     case EACCES:
 603     case ESRCH:
 604     case EROFS:
 605     case EPERM:     set_error( STATUS_ACCESS_DENIED ); break;
 606     case EBUSY:     set_error( STATUS_FILE_LOCK_CONFLICT ); break;
 607     case ENOENT:    set_error( STATUS_NO_SUCH_FILE ); break;
 608     case EISDIR:    set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
 609     case ENFILE:
 610     case EMFILE:    set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
 611     case EEXIST:    set_error( STATUS_OBJECT_NAME_COLLISION ); break;
 612     case EINVAL:    set_error( STATUS_INVALID_PARAMETER ); break;
 613     case ESPIPE:    set_error( STATUS_ILLEGAL_FUNCTION ); break;
 614     case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
 615     case EIO:       set_error( STATUS_ACCESS_VIOLATION ); break;
 616     case ENOTDIR:   set_error( STATUS_NOT_A_DIRECTORY ); break;
 617     case EFBIG:     set_error( STATUS_SECTION_TOO_BIG ); break;
 618     case ENODEV:    set_error( STATUS_NO_SUCH_DEVICE ); break;
 619     case ENXIO:     set_error( STATUS_NO_SUCH_DEVICE ); break;
 620 #ifdef EOVERFLOW
 621     case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
 622 #endif
 623     default:
 624         perror("wineserver: file_set_error() can't map error");
 625         set_error( STATUS_UNSUCCESSFUL );
 626         break;
 627     }
 628 }
 629
 630 struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
 631 {
 632     return (struct file *)get_handle_obj( process, handle, access, &file_ops );
 633 }
 634
 635 int get_file_unix_fd( struct file *file )
 636 {
 637     return get_unix_fd( file->fd );
 638 }
 639
 640 /* create a file */
 641 DECL_HANDLER(create_file)
 642 {
 643     struct object *file;
 644     struct fd *root_fd = NULL;
 645     const struct object_attributes *objattr = get_req_data();
 646     const struct security_descriptor *sd;
 647     const char *name;
 648     data_size_t name_len;
 649
 650     reply->handle = 0;
 651
 652     if (!objattr_is_valid( objattr, get_req_data_size() ))
 653         return;
 654     /* name is transferred in the unix codepage outside of the objattr structure */
 655     if (objattr->name_len)
 656     {
 657         set_error( STATUS_INVALID_PARAMETER );
 658         return;
 659     }
 660
 661     if (objattr->rootdir)
 662     {
 663         struct dir *root;
 664
 665         if (!(root = get_dir_obj( current->process, objattr->rootdir, 0 ))) return;
 666         root_fd = get_obj_fd( (struct object *)root );
 667         release_object( root );
 668         if (!root_fd) return;
 669     }
 670
 671     sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
 672
 673     name = (const char *)get_req_data() + sizeof(*objattr) + objattr->sd_len;
 674     name_len = get_req_data_size() - sizeof(*objattr) - objattr->sd_len;
 675
 676     reply->handle = 0;
 677     if ((file = create_file( root_fd, name, name_len, req->access, req->sharing,
 678                              req->create, req->options, req->attrs, sd )))
 679     {
 680         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 681         release_object( file );
 682     }
 683     if (root_fd) release_object( root_fd );
 684 }
 685
 686 /* allocate a file handle for a Unix fd */
 687 DECL_HANDLER(alloc_file_handle)
 688 {
 689     struct file *file;
 690     int fd;
 691
 692     reply->handle = 0;
 693     if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
 694     {
 695         set_error( STATUS_INVALID_HANDLE );
 696         return;
 697     }
 698     if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
 699     {
 700         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 701         release_object( file );
 702     }
 703 }
 704
 705 /* lock a region of a file */
 706 DECL_HANDLER(lock_file)
 707 {
 708     struct file *file;
 709
 710     if ((file = get_file_obj( current->process, req->handle, 0 )))
 711     {
 712         reply->handle = lock_fd( file->fd, req->offset, req->count, req->shared, req->wait );
 713         reply->overlapped = is_overlapped( file );
 714         release_object( file );
 715     }
 716 }
 717
 718 /* unlock a region of a file */
 719 DECL_HANDLER(unlock_file)
 720 {
 721     struct file *file;
 722
 723     if ((file = get_file_obj( current->process, req->handle, 0 )))
 724     {
 725         unlock_fd( file->fd, req->offset, req->count );
 726         release_object( file );
 727     }
 728 }