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
  56 struct file
  57 {
  58     struct object       obj;        /* object header */
  59     struct fd          *fd;         /* file descriptor for this file */
  60     unsigned int        access;     /* file access (FILE_READ_DATA etc.) */
  61 };
  62
  63 static unsigned int generic_file_map_access( unsigned int access );
  64
  65 static void file_dump( struct object *obj, int verbose );
  66 static struct fd *file_get_fd( struct object *obj );
  67 static unsigned int file_map_access( struct object *obj, unsigned int access );
  68 static void file_destroy( struct object *obj );
  69
  70 static int file_get_poll_events( struct fd *fd );
  71 static void file_flush( struct fd *fd, struct event **event );
  72 static enum server_fd_type file_get_fd_type( struct fd *fd );
  73
  74 static const struct object_ops file_ops =
  75 {
  76     sizeof(struct file),          /* size */
  77     file_dump,                    /* dump */
  78     add_queue,                    /* add_queue */
  79     remove_queue,                 /* remove_queue */
  80     default_fd_signaled,          /* signaled */
  81     no_satisfied,                 /* satisfied */
  82     no_signal,                    /* signal */
  83     file_get_fd,                  /* get_fd */
  84     file_map_access,              /* map_access */
  85     no_lookup_name,               /* lookup_name */
  86     no_open_file,                 /* open_file */
  87     fd_close_handle,              /* close_handle */
  88     file_destroy                  /* destroy */
  89 };
  90
  91 static const struct fd_ops file_fd_ops =
  92 {
  93     file_get_poll_events,         /* get_poll_events */
  94     default_poll_event,           /* poll_event */
  95     file_flush,                   /* flush */
  96     file_get_fd_type,             /* get_fd_type */
  97     default_fd_queue_async,       /* queue_async */
  98     default_fd_reselect_async,    /* reselect_async */
  99     default_fd_cancel_async       /* cancel_async */
 100 };
 101
 102 static inline int is_overlapped( const struct file *file )
 103 {
 104     return !(get_fd_options( file->fd ) & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
 105 }
 106
 107 /* create a file from a file descriptor */
 108 /* if the function fails the fd is closed */
 109 static struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing )
 110 {
 111     struct file *file;
 112
 113     if ((file = alloc_object( &file_ops )))
 114     {
 115         file->access = file_map_access( &file->obj, access );
 116         if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj,
 117                                               FILE_SYNCHRONOUS_IO_NONALERT )))
 118         {
 119             release_object( file );
 120             return NULL;
 121         }
 122     }
 123     return file;
 124 }
 125
 126 static struct object *create_file_obj( struct fd *fd, unsigned int access )
 127 {
 128     struct file *file = alloc_object( &file_ops );
 129
 130     if (!file) return NULL;
 131     file->access  = access;
 132     file->fd      = fd;
 133     grab_object( fd );
 134     set_fd_user( fd, &file_fd_ops, &file->obj );
 135     return &file->obj;
 136 }
 137
 138 static struct object *create_file( const char *nameptr, data_size_t len, unsigned int access,
 139                                    unsigned int sharing, int create, unsigned int options,
 140                                    unsigned int attrs )
 141 {
 142     struct object *obj = NULL;
 143     struct fd *fd;
 144     int flags;
 145     char *name;
 146     mode_t mode;
 147
 148     if (!(name = mem_alloc( len + 1 ))) return NULL;
 149     memcpy( name, nameptr, len );
 150     name[len] = 0;
 151
 152     switch(create)
 153     {
 154     case FILE_CREATE:       flags = O_CREAT | O_EXCL; break;
 155     case FILE_OVERWRITE_IF: /* FIXME: the difference is whether we trash existing attr or not */
 156     case FILE_SUPERSEDE:    flags = O_CREAT | O_TRUNC; break;
 157     case FILE_OPEN:         flags = 0; break;
 158     case FILE_OPEN_IF:      flags = O_CREAT; break;
 159     case FILE_OVERWRITE:    flags = O_TRUNC; break;
 160     default:                set_error( STATUS_INVALID_PARAMETER ); goto done;
 161     }
 162
 163     mode = (attrs & FILE_ATTRIBUTE_READONLY) ? 0444 : 0666;
 164
 165     if (len >= 4 &&
 166         (!strcasecmp( name + len - 4, ".exe" ) || !strcasecmp( name + len - 4, ".com" )))
 167         mode |= 0111;
 168
 169     access = generic_file_map_access( access );
 170
 171     /* FIXME: should set error to STATUS_OBJECT_NAME_COLLISION if file existed before */
 172     fd = open_fd( name, flags | O_NONBLOCK | O_LARGEFILE, &mode, access, sharing, options );
 173     if (!fd) goto done;
 174
 175     if (S_ISDIR(mode))
 176         obj = create_dir_obj( fd );
 177     else if (S_ISCHR(mode) && is_serial_fd( fd ))
 178         obj = create_serial( fd );
 179     else
 180         obj = create_file_obj( fd, access );
 181
 182     release_object( fd );
 183
 184 done:
 185     free( name );
 186     return obj;
 187 }
 188
 189 /* check if two file objects point to the same file */
 190 int is_same_file( struct file *file1, struct file *file2 )
 191 {
 192     return is_same_file_fd( file1->fd, file2->fd );
 193 }
 194
 195 /* create a temp file for anonymous mappings */
 196 struct file *create_temp_file( int access )
 197 {
 198     char tmpfn[16];
 199     int fd;
 200
 201     sprintf( tmpfn, "anonmap.XXXXXX" );  /* create it in the server directory */
 202     fd = mkstemps( tmpfn, 0 );
 203     if (fd == -1)
 204     {
 205         file_set_error();
 206         return NULL;
 207     }
 208     unlink( tmpfn );
 209     return create_file_for_fd( fd, access, 0 );
 210 }
 211
 212 static void file_dump( struct object *obj, int verbose )
 213 {
 214     struct file *file = (struct file *)obj;
 215     assert( obj->ops == &file_ops );
 216     fprintf( stderr, "File fd=%p\n", file->fd );
 217 }
 218
 219 static int file_get_poll_events( struct fd *fd )
 220 {
 221     struct file *file = get_fd_user( fd );
 222     int events = 0;
 223     assert( file->obj.ops == &file_ops );
 224     if (file->access & FILE_UNIX_READ_ACCESS) events |= POLLIN;
 225     if (file->access & FILE_UNIX_WRITE_ACCESS) events |= POLLOUT;
 226     return events;
 227 }
 228
 229 static void file_flush( struct fd *fd, struct event **event )
 230 {
 231     int unix_fd = get_unix_fd( fd );
 232     if (unix_fd != -1 && fsync( unix_fd ) == -1) file_set_error();
 233 }
 234
 235 static enum server_fd_type file_get_fd_type( struct fd *fd )
 236 {
 237     return FD_TYPE_FILE;
 238 }
 239
 240 static struct fd *file_get_fd( struct object *obj )
 241 {
 242     struct file *file = (struct file *)obj;
 243     assert( obj->ops == &file_ops );
 244     return (struct fd *)grab_object( file->fd );
 245 }
 246
 247 static unsigned int generic_file_map_access( unsigned int access )
 248 {
 249     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 250     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 251     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 252     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 253     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 254 }
 255
 256 static unsigned int file_map_access( struct object *obj, unsigned int access )
 257 {
 258     return generic_file_map_access( access );
 259 }
 260
 261 static void file_destroy( struct object *obj )
 262 {
 263     struct file *file = (struct file *)obj;
 264     assert( obj->ops == &file_ops );
 265
 266     if (file->fd) release_object( file->fd );
 267 }
 268
 269 /* set the last error depending on errno */
 270 void file_set_error(void)
 271 {
 272     switch (errno)
 273     {
 274     case EAGAIN:    set_error( STATUS_SHARING_VIOLATION ); break;
 275     case EBADF:     set_error( STATUS_INVALID_HANDLE ); break;
 276     case ENOSPC:    set_error( STATUS_DISK_FULL ); break;
 277     case EACCES:
 278     case ESRCH:
 279     case EPERM:     set_error( STATUS_ACCESS_DENIED ); break;
 280     case EROFS:     set_error( STATUS_MEDIA_WRITE_PROTECTED ); break;
 281     case EBUSY:     set_error( STATUS_FILE_LOCK_CONFLICT ); break;
 282     case ENOENT:    set_error( STATUS_NO_SUCH_FILE ); break;
 283     case EISDIR:    set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
 284     case ENFILE:
 285     case EMFILE:    set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
 286     case EEXIST:    set_error( STATUS_OBJECT_NAME_COLLISION ); break;
 287     case EINVAL:    set_error( STATUS_INVALID_PARAMETER ); break;
 288     case ESPIPE:    set_error( STATUS_ILLEGAL_FUNCTION ); break;
 289     case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
 290     case EIO:       set_error( STATUS_ACCESS_VIOLATION ); break;
 291     case ENOTDIR:   set_error( STATUS_NOT_A_DIRECTORY ); break;
 292     case EFBIG:     set_error( STATUS_SECTION_TOO_BIG ); break;
 293     case ENODEV:    set_error( STATUS_NO_SUCH_DEVICE ); break;
 294     case ENXIO:     set_error( STATUS_NO_SUCH_DEVICE ); break;
 295 #ifdef EOVERFLOW
 296     case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
 297 #endif
 298     default:        perror("file_set_error"); set_error( STATUS_UNSUCCESSFUL ); break;
 299     }
 300 }
 301
 302 struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
 303 {
 304     return (struct file *)get_handle_obj( process, handle, access, &file_ops );
 305 }
 306
 307 int get_file_unix_fd( struct file *file )
 308 {
 309     return get_unix_fd( file->fd );
 310 }
 311
 312 struct file *grab_file_unless_removable( struct file *file )
 313 {
 314     if (is_fd_removable( file->fd )) return NULL;
 315     return (struct file *)grab_object( file );
 316 }
 317
 318 /* extend a file beyond the current end of file */
 319 static int extend_file( struct file *file, file_pos_t new_size )
 320 {
 321     static const char zero;
 322     int unix_fd = get_file_unix_fd( file );
 323     off_t size = new_size;
 324
 325     if (unix_fd == -1) return 0;
 326
 327     if (sizeof(new_size) > sizeof(size) && size != new_size)
 328     {
 329         set_error( STATUS_INVALID_PARAMETER );
 330         return 0;
 331     }
 332     /* extend the file one byte beyond the requested size and then truncate it */
 333     /* this should work around ftruncate implementations that can't extend files */
 334     if (pwrite( unix_fd, &zero, 1, size ) != -1)
 335     {
 336         ftruncate( unix_fd, size );
 337         return 1;
 338     }
 339     file_set_error();
 340     return 0;
 341 }
 342
 343 /* try to grow the file to the specified size */
 344 int grow_file( struct file *file, file_pos_t size )
 345 {
 346     struct stat st;
 347     int unix_fd = get_file_unix_fd( file );
 348
 349     if (unix_fd == -1) return 0;
 350
 351     if (fstat( unix_fd, &st ) == -1)
 352     {
 353         file_set_error();
 354         return 0;
 355     }
 356     if (st.st_size >= size) return 1;  /* already large enough */
 357     return extend_file( file, size );
 358 }
 359
 360 /* create a file */
 361 DECL_HANDLER(create_file)
 362 {
 363     struct object *file;
 364
 365     reply->handle = 0;
 366     if ((file = create_file( get_req_data(), get_req_data_size(), req->access,
 367                              req->sharing, req->create, req->options, req->attrs )))
 368     {
 369         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 370         release_object( file );
 371     }
 372 }
 373
 374 /* allocate a file handle for a Unix fd */
 375 DECL_HANDLER(alloc_file_handle)
 376 {
 377     struct file *file;
 378     int fd;
 379
 380     reply->handle = 0;
 381     if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
 382     {
 383         set_error( STATUS_INVALID_HANDLE );
 384         return;
 385     }
 386     if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
 387     {
 388         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 389         release_object( file );
 390     }
 391 }
 392
 393 /* lock a region of a file */
 394 DECL_HANDLER(lock_file)
 395 {
 396     struct file *file;
 397     file_pos_t offset = ((file_pos_t)req->offset_high << 32) | req->offset_low;
 398     file_pos_t count = ((file_pos_t)req->count_high << 32) | req->count_low;
 399
 400     if ((file = get_file_obj( current->process, req->handle, 0 )))
 401     {
 402         reply->handle = lock_fd( file->fd, offset, count, req->shared, req->wait );
 403         reply->overlapped = is_overlapped( file );
 404         release_object( file );
 405     }
 406 }
 407
 408 /* unlock a region of a file */
 409 DECL_HANDLER(unlock_file)
 410 {
 411     struct file *file;
 412     file_pos_t offset = ((file_pos_t)req->offset_high << 32) | req->offset_low;
 413     file_pos_t count = ((file_pos_t)req->count_high << 32) | req->count_low;
 414
 415     if ((file = get_file_obj( current->process, req->handle, 0 )))
 416     {
 417         unlock_fd( file->fd, offset, count );
 418         release_object( file );
 419     }
 420 }