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 if (options & FILE_DIRECTORY_FILE)
 222         mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0555 : 0777;
 223     else
 224         mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
 225
 226     if (len >= 4 &&
 227         (!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
 228     {
 229         if (mode & S_IRUSR)
 230             mode |= S_IXUSR;
 231         if (mode & S_IRGRP)
 232             mode |= S_IXGRP;
 233         if (mode & S_IROTH)
 234             mode |= S_IXOTH;
 235     }
 236
 237     access = generic_file_map_access( access );
 238
 239     /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
 240     fd = open_fd( root, name, flags | O_NONBLOCK | O_LARGEFILE, &mode, access, sharing, options );
 241     if (!fd) goto done;
 242
 243     if (S_ISDIR(mode))
 244         obj = create_dir_obj( fd, access, mode );
 245     else if (S_ISCHR(mode) && is_serial_fd( fd ))
 246         obj = create_serial( fd );
 247     else
 248         obj = create_file_obj( fd, access, mode );
 249
 250     release_object( fd );
 251
 252 done:
 253     free( name );
 254     return obj;
 255 }
 256
 257 /* check if two file objects point to the same file */
 258 int is_same_file( struct file *file1, struct file *file2 )
 259 {
 260     return is_same_file_fd( file1->fd, file2->fd );
 261 }
 262
 263 static void file_dump( struct object *obj, int verbose )
 264 {
 265     struct file *file = (struct file *)obj;
 266     assert( obj->ops == &file_ops );
 267     fprintf( stderr, "File fd=%p\n", file->fd );
 268 }
 269
 270 static int file_get_poll_events( struct fd *fd )
 271 {
 272     struct file *file = get_fd_user( fd );
 273     int events = 0;
 274     assert( file->obj.ops == &file_ops );
 275     if (file->access & FILE_UNIX_READ_ACCESS) events |= POLLIN;
 276     if (file->access & FILE_UNIX_WRITE_ACCESS) events |= POLLOUT;
 277     return events;
 278 }
 279
 280 static void file_flush( struct fd *fd, struct event **event )
 281 {
 282     int unix_fd = get_unix_fd( fd );
 283     if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error();
 284 }
 285
 286 static enum server_fd_type file_get_fd_type( struct fd *fd )
 287 {
 288     struct file *file = get_fd_user( fd );
 289
 290     if (S_ISREG(file->mode) || S_ISBLK(file->mode)) return FD_TYPE_FILE;
 291     if (S_ISDIR(file->mode)) return FD_TYPE_DIR;
 292     return FD_TYPE_CHAR;
 293 }
 294
 295 static struct fd *file_get_fd( struct object *obj )
 296 {
 297     struct file *file = (struct file *)obj;
 298     assert( obj->ops == &file_ops );
 299     return (struct fd *)grab_object( file->fd );
 300 }
 301
 302 static unsigned int generic_file_map_access( unsigned int access )
 303 {
 304     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 305     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 306     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 307     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 308     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 309 }
 310
 311 struct security_descriptor *mode_to_sd( mode_t mode, const SID *user, const SID *group )
 312 {
 313     struct security_descriptor *sd;
 314     size_t dacl_size;
 315     ACE_HEADER *current_ace;
 316     ACCESS_ALLOWED_ACE *aaa;
 317     ACL *dacl;
 318     SID *sid;
 319     char *ptr;
 320     const SID *world_sid = security_world_sid;
 321     const SID *local_system_sid = security_local_system_sid;
 322
 323     dacl_size = sizeof(ACL) + FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) +
 324         security_sid_len( local_system_sid );
 325     if (mode & S_IRWXU)
 326         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( user );
 327     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 328         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 329         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 330         dacl_size += FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) + security_sid_len( user );
 331     if (mode & S_IRWXO)
 332         dacl_size += FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( world_sid );
 333
 334     sd = mem_alloc( sizeof(struct security_descriptor) +
 335                     security_sid_len( user ) + security_sid_len( group ) +
 336                     dacl_size );
 337     if (!sd) return sd;
 338
 339     sd->control = SE_DACL_PRESENT;
 340     sd->owner_len = security_sid_len( user );
 341     sd->group_len = security_sid_len( group );
 342     sd->sacl_len = 0;
 343     sd->dacl_len = dacl_size;
 344
 345     ptr = (char *)(sd + 1);
 346     memcpy( ptr, user, sd->owner_len );
 347     ptr += sd->owner_len;
 348     memcpy( ptr, group, sd->group_len );
 349     ptr += sd->group_len;
 350
 351     dacl = (ACL *)ptr;
 352     dacl->AclRevision = ACL_REVISION;
 353     dacl->Sbz1 = 0;
 354     dacl->AclSize = dacl_size;
 355     dacl->AceCount = 1 + (mode & S_IRWXU ? 1 : 0) + (mode & S_IRWXO ? 1 : 0);
 356     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 357         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 358         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 359         dacl->AceCount++;
 360     dacl->Sbz2 = 0;
 361
 362     /* always give FILE_ALL_ACCESS for Local System */
 363     aaa = (ACCESS_ALLOWED_ACE *)(dacl + 1);
 364     current_ace = &aaa->Header;
 365     aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 366     aaa->Header.AceFlags = 0;
 367     aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( local_system_sid );
 368     aaa->Mask = FILE_ALL_ACCESS;
 369     sid = (SID *)&aaa->SidStart;
 370     memcpy( sid, local_system_sid, security_sid_len( local_system_sid ));
 371
 372     if (mode & S_IRWXU)
 373     {
 374         /* appropriate access rights for the user */
 375         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 376         current_ace = &aaa->Header;
 377         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 378         aaa->Header.AceFlags = 0;
 379         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( user );
 380         aaa->Mask = WRITE_DAC | WRITE_OWNER;
 381         if (mode & S_IRUSR)
 382             aaa->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 383         if (mode & S_IWUSR)
 384             aaa->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 385         sid = (SID *)&aaa->SidStart;
 386         memcpy( sid, user, security_sid_len( user ));
 387     }
 388     if ((!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH))) ||
 389         (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IWOTH))) ||
 390         (!(mode & S_IXUSR) && (mode & (S_IXGRP|S_IXOTH))))
 391     {
 392         /* deny just in case the user is a member of the group */
 393         ACCESS_DENIED_ACE *ada = (ACCESS_DENIED_ACE *)ace_next( current_ace );
 394         current_ace = &ada->Header;
 395         ada->Header.AceType = ACCESS_DENIED_ACE_TYPE;
 396         ada->Header.AceFlags = 0;
 397         ada->Header.AceSize = FIELD_OFFSET(ACCESS_DENIED_ACE, SidStart) + security_sid_len( user );
 398         ada->Mask = 0;
 399         if (!(mode & S_IRUSR) && (mode & (S_IRGRP|S_IROTH)))
 400             ada->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 401         if (!(mode & S_IWUSR) && (mode & (S_IWGRP|S_IROTH)))
 402             ada->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 403         ada->Mask &= ~STANDARD_RIGHTS_ALL; /* never deny standard rights */
 404         sid = (SID *)&ada->SidStart;
 405         memcpy( sid, user, security_sid_len( user ));
 406     }
 407     if (mode & S_IRWXO)
 408     {
 409         /* appropriate access rights for Everyone */
 410         aaa = (ACCESS_ALLOWED_ACE *)ace_next( current_ace );
 411         current_ace = &aaa->Header;
 412         aaa->Header.AceType = ACCESS_ALLOWED_ACE_TYPE;
 413         aaa->Header.AceFlags = 0;
 414         aaa->Header.AceSize = FIELD_OFFSET(ACCESS_ALLOWED_ACE, SidStart) + security_sid_len( world_sid );
 415         aaa->Mask = 0;
 416         if (mode & S_IROTH)
 417             aaa->Mask |= FILE_GENERIC_READ | FILE_GENERIC_EXECUTE;
 418         if (mode & S_IWOTH)
 419             aaa->Mask |= FILE_GENERIC_WRITE | DELETE | FILE_DELETE_CHILD;
 420         sid = (SID *)&aaa->SidStart;
 421         memcpy( sid, world_sid, security_sid_len( world_sid ));
 422     }
 423
 424     return sd;
 425 }
 426
 427 static struct security_descriptor *file_get_sd( struct object *obj )
 428 {
 429     struct file *file = (struct file *)obj;
 430     struct stat st;
 431     int unix_fd;
 432     struct security_descriptor *sd;
 433
 434     assert( obj->ops == &file_ops );
 435
 436     unix_fd = get_file_unix_fd( file );
 437
 438     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1)
 439         return obj->sd;
 440
 441     /* mode and uid the same? if so, no need to re-generate security descriptor */
 442     if (obj->sd && (st.st_mode & (S_IRWXU|S_IRWXO)) == (file->mode & (S_IRWXU|S_IRWXO)) &&
 443         (st.st_uid == file->uid))
 444         return obj->sd;
 445
 446     sd = mode_to_sd( st.st_mode,
 447                      security_unix_uid_to_sid( st.st_uid ),
 448                      token_get_primary_group( current->process->token ));
 449     if (!sd) return obj->sd;
 450
 451     file->mode = st.st_mode;
 452     file->uid = st.st_uid;
 453     free( obj->sd );
 454     obj->sd = sd;
 455     return sd;
 456 }
 457
 458 static mode_t file_access_to_mode( unsigned int access )
 459 {
 460     mode_t mode = 0;
 461
 462     access = generic_file_map_access( access );
 463     if (access & FILE_READ_DATA)  mode |= 4;
 464     if (access & (FILE_WRITE_DATA|FILE_APPEND_DATA)) mode |= 2;
 465     if (access & FILE_EXECUTE)    mode |= 1;
 466     return mode;
 467 }
 468
 469 mode_t sd_to_mode( const struct security_descriptor *sd, const SID *owner )
 470 {
 471     mode_t new_mode = 0;
 472     mode_t denied_mode = 0;
 473     mode_t mode;
 474     int present;
 475     const ACL *dacl = sd_get_dacl( sd, &present );
 476     const SID *user = token_get_user( current->process->token );
 477     if (present && dacl)
 478     {
 479         const ACE_HEADER *ace = (const ACE_HEADER *)(dacl + 1);
 480         ULONG i;
 481         for (i = 0; i < dacl->AceCount; i++, ace = ace_next( ace ))
 482         {
 483             const ACCESS_ALLOWED_ACE *aa_ace;
 484             const ACCESS_DENIED_ACE *ad_ace;
 485             const SID *sid;
 486
 487             if (ace->AceFlags & INHERIT_ONLY_ACE) continue;
 488
 489             switch (ace->AceType)
 490             {
 491                 case ACCESS_DENIED_ACE_TYPE:
 492                     ad_ace = (const ACCESS_DENIED_ACE *)ace;
 493                     sid = (const SID *)&ad_ace->SidStart;
 494                     mode = file_access_to_mode( ad_ace->Mask );
 495                     if (security_equal_sid( sid, security_world_sid ))
 496                     {
 497                         denied_mode |= (mode << 6) | (mode << 3) | mode; /* all */
 498                     }
 499                     else if ((security_equal_sid( user, owner ) &&
 500                               token_sid_present( current->process->token, sid, TRUE )))
 501                     {
 502                         denied_mode |= (mode << 6) | (mode << 3);  /* user + group */
 503                     }
 504                     else if (security_equal_sid( sid, owner ))
 505                     {
 506                         denied_mode |= (mode << 6);  /* user only */
 507                     }
 508                     break;
 509                 case ACCESS_ALLOWED_ACE_TYPE:
 510                     aa_ace = (const ACCESS_ALLOWED_ACE *)ace;
 511                     sid = (const SID *)&aa_ace->SidStart;
 512                     mode = file_access_to_mode( aa_ace->Mask );
 513                     if (security_equal_sid( sid, security_world_sid ))
 514                     {
 515                         new_mode |= (mode << 6) | (mode << 3) | mode;  /* all */
 516                     }
 517                     else if ((security_equal_sid( user, owner ) &&
 518                               token_sid_present( current->process->token, sid, FALSE )))
 519                     {
 520                         new_mode |= (mode << 6) | (mode << 3);  /* user + group */
 521                     }
 522                     else if (security_equal_sid( sid, owner ))
 523                     {
 524                         new_mode |= (mode << 6);  /* user only */
 525                     }
 526                     break;
 527             }
 528         }
 529     }
 530     else
 531         /* no ACL means full access rights to anyone */
 532         new_mode = S_IRWXU | S_IRWXG | S_IRWXO;
 533
 534     return new_mode & ~denied_mode;
 535 }
 536
 537 static int file_set_sd( struct object *obj, const struct security_descriptor *sd,
 538                         unsigned int set_info )
 539 {
 540     struct file *file = (struct file *)obj;
 541     const SID *owner;
 542     struct stat st;
 543     mode_t mode;
 544     int unix_fd;
 545
 546     assert( obj->ops == &file_ops );
 547
 548     unix_fd = get_file_unix_fd( file );
 549
 550     if (unix_fd == -1 || fstat( unix_fd, &st ) == -1) return 1;
 551
 552     if (set_info & OWNER_SECURITY_INFORMATION)
 553     {
 554         owner = sd_get_owner( sd );
 555         if (!owner)
 556         {
 557             set_error( STATUS_INVALID_SECURITY_DESCR );
 558             return 0;
 559         }
 560         if (!obj->sd || !security_equal_sid( owner, sd_get_owner( obj->sd ) ))
 561         {
 562             /* FIXME: get Unix uid and call fchown */
 563         }
 564     }
 565     else if (obj->sd)
 566         owner = sd_get_owner( obj->sd );
 567     else
 568         owner = token_get_user( current->process->token );
 569
 570     /* group and sacl not supported */
 571
 572     if (set_info & DACL_SECURITY_INFORMATION)
 573     {
 574         /* keep the bits that we don't map to access rights in the ACL */
 575         mode = st.st_mode & (S_ISUID|S_ISGID|S_ISVTX);
 576         mode |= sd_to_mode( sd, owner );
 577
 578         if (((st.st_mode ^ mode) & (S_IRWXU|S_IRWXG|S_IRWXO)) && fchmod( unix_fd, mode ) == -1)
 579         {
 580             file_set_error();
 581             return 0;
 582         }
 583     }
 584     return 1;
 585 }
 586
 587 static void file_destroy( struct object *obj )
 588 {
 589     struct file *file = (struct file *)obj;
 590     assert( obj->ops == &file_ops );
 591
 592     if (file->fd) release_object( file->fd );
 593 }
 594
 595 /* set the last error depending on errno */
 596 void file_set_error(void)
 597 {
 598     switch (errno)
 599     {
 600     case ETXTBSY:
 601     case EAGAIN:    set_error( STATUS_SHARING_VIOLATION ); break;
 602     case EBADF:     set_error( STATUS_INVALID_HANDLE ); break;
 603     case ENOSPC:    set_error( STATUS_DISK_FULL ); break;
 604     case EACCES:
 605     case ESRCH:
 606     case EROFS:
 607     case EPERM:     set_error( STATUS_ACCESS_DENIED ); break;
 608     case EBUSY:     set_error( STATUS_FILE_LOCK_CONFLICT ); break;
 609     case ENOENT:    set_error( STATUS_NO_SUCH_FILE ); break;
 610     case EISDIR:    set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
 611     case ENFILE:
 612     case EMFILE:    set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
 613     case EEXIST:    set_error( STATUS_OBJECT_NAME_COLLISION ); break;
 614     case EINVAL:    set_error( STATUS_INVALID_PARAMETER ); break;
 615     case ESPIPE:    set_error( STATUS_ILLEGAL_FUNCTION ); break;
 616     case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
 617     case EIO:       set_error( STATUS_ACCESS_VIOLATION ); break;
 618     case ENOTDIR:   set_error( STATUS_NOT_A_DIRECTORY ); break;
 619     case EFBIG:     set_error( STATUS_SECTION_TOO_BIG ); break;
 620     case ENODEV:    set_error( STATUS_NO_SUCH_DEVICE ); break;
 621     case ENXIO:     set_error( STATUS_NO_SUCH_DEVICE ); break;
 622 #ifdef EOVERFLOW
 623     case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
 624 #endif
 625     default:
 626         perror("wineserver: file_set_error() can't map error");
 627         set_error( STATUS_UNSUCCESSFUL );
 628         break;
 629     }
 630 }
 631
 632 struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
 633 {
 634     return (struct file *)get_handle_obj( process, handle, access, &file_ops );
 635 }
 636
 637 int get_file_unix_fd( struct file *file )
 638 {
 639     return get_unix_fd( file->fd );
 640 }
 641
 642 /* create a file */
 643 DECL_HANDLER(create_file)
 644 {
 645     struct object *file;
 646     struct fd *root_fd = NULL;
 647     const struct object_attributes *objattr = get_req_data();
 648     const struct security_descriptor *sd;
 649     const char *name;
 650     data_size_t name_len;
 651
 652     reply->handle = 0;
 653
 654     if (!objattr_is_valid( objattr, get_req_data_size() ))
 655         return;
 656     /* name is transferred in the unix codepage outside of the objattr structure */
 657     if (objattr->name_len)
 658     {
 659         set_error( STATUS_INVALID_PARAMETER );
 660         return;
 661     }
 662
 663     if (objattr->rootdir)
 664     {
 665         struct dir *root;
 666
 667         if (!(root = get_dir_obj( current->process, objattr->rootdir, 0 ))) return;
 668         root_fd = get_obj_fd( (struct object *)root );
 669         release_object( root );
 670         if (!root_fd) return;
 671     }
 672
 673     sd = objattr->sd_len ? (const struct security_descriptor *)(objattr + 1) : NULL;
 674
 675     name = (const char *)get_req_data() + sizeof(*objattr) + objattr->sd_len;
 676     name_len = get_req_data_size() - sizeof(*objattr) - objattr->sd_len;
 677
 678     reply->handle = 0;
 679     if ((file = create_file( root_fd, name, name_len, req->access, req->sharing,
 680                              req->create, req->options, req->attrs, sd )))
 681     {
 682         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 683         release_object( file );
 684     }
 685     if (root_fd) release_object( root_fd );
 686 }
 687
 688 /* allocate a file handle for a Unix fd */
 689 DECL_HANDLER(alloc_file_handle)
 690 {
 691     struct file *file;
 692     int fd;
 693
 694     reply->handle = 0;
 695     if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
 696     {
 697         set_error( STATUS_INVALID_HANDLE );
 698         return;
 699     }
 700     if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
 701     {
 702         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 703         release_object( file );
 704     }
 705 }
 706
 707 /* lock a region of a file */
 708 DECL_HANDLER(lock_file)
 709 {
 710     struct file *file;
 711
 712     if ((file = get_file_obj( current->process, req->handle, 0 )))
 713     {
 714         reply->handle = lock_fd( file->fd, req->offset, req->count, req->shared, req->wait );
 715         reply->overlapped = is_overlapped( file );
 716         release_object( file );
 717     }
 718 }
 719
 720 /* unlock a region of a file */
 721 DECL_HANDLER(unlock_file)
 722 {
 723     struct file *file;
 724
 725     if ((file = get_file_obj( current->process, req->handle, 0 )))
 726     {
 727         unlock_fd( file->fd, req->offset, req->count );
 728         release_object( file );
 729     }
 730 }