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     unsigned int        options;    /* file options (FILE_DELETE_ON_CLOSE, FILE_SYNCHRONOUS...) */
  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 unsigned int file_map_access( struct object *obj, unsigned int access );
  69 static void file_destroy( struct object *obj );
  70
  71 static int file_get_poll_events( struct fd *fd );
  72 static int file_flush( struct fd *fd, struct event **event );
  73 static int file_get_info( struct fd *fd );
  74
  75 static const struct object_ops file_ops =
  76 {
  77     sizeof(struct file),          /* size */
  78     file_dump,                    /* dump */
  79     default_fd_add_queue,         /* add_queue */
  80     default_fd_remove_queue,      /* remove_queue */
  81     default_fd_signaled,          /* signaled */
  82     no_satisfied,                 /* satisfied */
  83     no_signal,                    /* signal */
  84     file_get_fd,                  /* get_fd */
  85     file_map_access,              /* map_access */
  86     no_lookup_name,               /* lookup_name */
  87     no_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_info,                /* get_file_info */
  97     default_fd_queue_async,       /* queue_async */
  98     default_fd_cancel_async       /* cancel_async */
  99 };
 100
 101 static inline int is_overlapped( const struct file *file )
 102 {
 103     return !(file->options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
 104 }
 105
 106 /* create a file from a file descriptor */
 107 /* if the function fails the fd is closed */
 108 static struct file *create_file_for_fd( int fd, unsigned int access, unsigned int sharing )
 109 {
 110     struct file *file;
 111
 112     if ((file = alloc_object( &file_ops )))
 113     {
 114         file->access     = file_map_access( &file->obj, access );
 115         file->options    = FILE_SYNCHRONOUS_IO_NONALERT;
 116         if (!(file->fd = create_anonymous_fd( &file_fd_ops, fd, &file->obj )))
 117         {
 118             release_object( file );
 119             return NULL;
 120         }
 121     }
 122     return file;
 123 }
 124
 125 static struct object *create_file_obj( struct fd *fd, unsigned int access, unsigned int options )
 126 {
 127     struct file *file = alloc_object( &file_ops );
 128
 129     if (!file) return NULL;
 130     file->access  = access;
 131     file->options = options;
 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, options );
 179     else
 180         obj = create_file_obj( fd, access, options );
 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 options=%08x\n", file->fd, file->options );
 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 int file_flush( struct fd *fd, struct event **event )
 230 {
 231     int ret = 0, unix_fd = get_unix_fd( fd );
 232
 233     if (unix_fd != -1)
 234     {
 235         ret = (fsync( unix_fd ) != -1);
 236         if (!ret) file_set_error();
 237     }
 238     return ret;
 239 }
 240
 241 static int file_get_info( struct fd *fd )
 242 {
 243     struct file *file = get_fd_user( fd );
 244
 245     if (is_overlapped( file )) return FD_FLAG_OVERLAPPED;
 246     else return 0;
 247 }
 248
 249 static struct fd *file_get_fd( struct object *obj )
 250 {
 251     struct file *file = (struct file *)obj;
 252     assert( obj->ops == &file_ops );
 253     return (struct fd *)grab_object( file->fd );
 254 }
 255
 256 static unsigned int generic_file_map_access( unsigned int access )
 257 {
 258     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 259     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 260     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 261     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 262     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 263 }
 264
 265 static unsigned int file_map_access( struct object *obj, unsigned int access )
 266 {
 267     return generic_file_map_access( access );
 268 }
 269
 270 static void file_destroy( struct object *obj )
 271 {
 272     struct file *file = (struct file *)obj;
 273     assert( obj->ops == &file_ops );
 274
 275     if (file->fd) release_object( file->fd );
 276 }
 277
 278 /* set the last error depending on errno */
 279 void file_set_error(void)
 280 {
 281     switch (errno)
 282     {
 283     case EAGAIN:    set_error( STATUS_SHARING_VIOLATION ); break;
 284     case EBADF:     set_error( STATUS_INVALID_HANDLE ); break;
 285     case ENOSPC:    set_error( STATUS_DISK_FULL ); break;
 286     case EACCES:
 287     case ESRCH:
 288     case EPERM:     set_error( STATUS_ACCESS_DENIED ); break;
 289     case EROFS:     set_error( STATUS_MEDIA_WRITE_PROTECTED ); break;
 290     case EBUSY:     set_error( STATUS_FILE_LOCK_CONFLICT ); break;
 291     case ENOENT:    set_error( STATUS_NO_SUCH_FILE ); break;
 292     case EISDIR:    set_error( STATUS_FILE_IS_A_DIRECTORY ); break;
 293     case ENFILE:
 294     case EMFILE:    set_error( STATUS_TOO_MANY_OPENED_FILES ); break;
 295     case EEXIST:    set_error( STATUS_OBJECT_NAME_COLLISION ); break;
 296     case EINVAL:    set_error( STATUS_INVALID_PARAMETER ); break;
 297     case ESPIPE:    set_win32_error( ERROR_SEEK ); break;
 298     case ENOTEMPTY: set_error( STATUS_DIRECTORY_NOT_EMPTY ); break;
 299     case EIO:       set_error( STATUS_ACCESS_VIOLATION ); break;
 300     case ENOTDIR:   set_error( STATUS_NOT_A_DIRECTORY ); break;
 301     case EFBIG:     set_error( STATUS_SECTION_TOO_BIG ); break;
 302     case ENODEV:    set_error( STATUS_NO_SUCH_DEVICE ); break;
 303     case ENXIO:     set_error( STATUS_NO_SUCH_DEVICE ); break;
 304 #ifdef EOVERFLOW
 305     case EOVERFLOW: set_error( STATUS_INVALID_PARAMETER ); break;
 306 #endif
 307     default:        perror("file_set_error"); set_error( STATUS_UNSUCCESSFUL ); break;
 308     }
 309 }
 310
 311 struct file *get_file_obj( struct process *process, obj_handle_t handle, unsigned int access )
 312 {
 313     return (struct file *)get_handle_obj( process, handle, access, &file_ops );
 314 }
 315
 316 int get_file_unix_fd( struct file *file )
 317 {
 318     return get_unix_fd( file->fd );
 319 }
 320
 321 /* extend a file beyond the current end of file */
 322 static int extend_file( struct file *file, file_pos_t new_size )
 323 {
 324     static const char zero;
 325     int unix_fd = get_file_unix_fd( file );
 326     off_t size = new_size;
 327
 328     if (unix_fd == -1) return 0;
 329
 330     if (sizeof(new_size) > sizeof(size) && size != new_size)
 331     {
 332         set_error( STATUS_INVALID_PARAMETER );
 333         return 0;
 334     }
 335     /* extend the file one byte beyond the requested size and then truncate it */
 336     /* this should work around ftruncate implementations that can't extend files */
 337     if (pwrite( unix_fd, &zero, 1, size ) != -1)
 338     {
 339         ftruncate( unix_fd, size );
 340         return 1;
 341     }
 342     file_set_error();
 343     return 0;
 344 }
 345
 346 /* try to grow the file to the specified size */
 347 int grow_file( struct file *file, file_pos_t size )
 348 {
 349     struct stat st;
 350     int unix_fd = get_file_unix_fd( file );
 351
 352     if (unix_fd == -1) return 0;
 353
 354     if (fstat( unix_fd, &st ) == -1)
 355     {
 356         file_set_error();
 357         return 0;
 358     }
 359     if (st.st_size >= size) return 1;  /* already large enough */
 360     return extend_file( file, size );
 361 }
 362
 363 /* create a file */
 364 DECL_HANDLER(create_file)
 365 {
 366     struct object *file;
 367
 368     reply->handle = 0;
 369     if ((file = create_file( get_req_data(), get_req_data_size(), req->access,
 370                              req->sharing, req->create, req->options, req->attrs )))
 371     {
 372         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 373         release_object( file );
 374     }
 375 }
 376
 377 /* allocate a file handle for a Unix fd */
 378 DECL_HANDLER(alloc_file_handle)
 379 {
 380     struct file *file;
 381     int fd;
 382
 383     reply->handle = 0;
 384     if ((fd = thread_get_inflight_fd( current, req->fd )) == -1)
 385     {
 386         set_error( STATUS_INVALID_HANDLE );
 387         return;
 388     }
 389     if ((file = create_file_for_fd( fd, req->access, FILE_SHARE_READ | FILE_SHARE_WRITE )))
 390     {
 391         reply->handle = alloc_handle( current->process, file, req->access, req->attributes );
 392         release_object( file );
 393     }
 394 }
 395
 396 /* lock a region of a file */
 397 DECL_HANDLER(lock_file)
 398 {
 399     struct file *file;
 400     file_pos_t offset = ((file_pos_t)req->offset_high << 32) | req->offset_low;
 401     file_pos_t count = ((file_pos_t)req->count_high << 32) | req->count_low;
 402
 403     if ((file = get_file_obj( current->process, req->handle, 0 )))
 404     {
 405         reply->handle = lock_fd( file->fd, offset, count, req->shared, req->wait );
 406         reply->overlapped = is_overlapped( file );
 407         release_object( file );
 408     }
 409 }
 410
 411 /* unlock a region of a file */
 412 DECL_HANDLER(unlock_file)
 413 {
 414     struct file *file;
 415     file_pos_t offset = ((file_pos_t)req->offset_high << 32) | req->offset_low;
 416     file_pos_t count = ((file_pos_t)req->count_high << 32) | req->count_low;
 417
 418     if ((file = get_file_obj( current->process, req->handle, 0 )))
 419     {
 420         unlock_fd( file->fd, offset, count );
 421         release_object( file );
 422     }
 423 }