server/device.c

   1 /*
   2  * Server-side device support
   3  *
   4  * Copyright (C) 2007 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 <assert.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <stdarg.h>
  25
  26 #include "ntstatus.h"
  27 #define WIN32_NO_STATUS
  28 #include "windef.h"
  29 #include "winternl.h"
  30
  31 #include "object.h"
  32 #include "file.h"
  33 #include "handle.h"
  34 #include "request.h"
  35
  36 struct ioctl_call
  37 {
  38     struct object          obj;           /* object header */
  39     struct list            dev_entry;     /* entry in device queue */
  40     struct list            mgr_entry;     /* entry in manager queue */
  41     struct device         *device;        /* device containing this ioctl */
  42     struct thread         *thread;        /* thread that queued the ioctl */
  43     void                  *user_arg;      /* user arg used to identify the request */
  44     struct async          *async;         /* pending async op */
  45     ioctl_code_t           code;          /* ioctl code */
  46     unsigned int           status;        /* resulting status (or STATUS_PENDING) */
  47     data_size_t            in_size;       /* size of input data */
  48     void                  *in_data;       /* input data */
  49     data_size_t            out_size;      /* size of output data */
  50     void                  *out_data;      /* output data */
  51 };
  52
  53 static void ioctl_call_dump( struct object *obj, int verbose );
  54 static int ioctl_call_signaled( struct object *obj, struct thread *thread );
  55 static void ioctl_call_destroy( struct object *obj );
  56
  57 static const struct object_ops ioctl_call_ops =
  58 {
  59     sizeof(struct ioctl_call),        /* size */
  60     ioctl_call_dump,                  /* dump */
  61     no_get_type,                      /* get_type */
  62     add_queue,                        /* add_queue */
  63     remove_queue,                     /* remove_queue */
  64     ioctl_call_signaled,              /* signaled */
  65     no_satisfied,                     /* satisfied */
  66     no_signal,                        /* signal */
  67     no_get_fd,                        /* get_fd */
  68     no_map_access,                    /* map_access */
  69     default_get_sd,                   /* get_sd */
  70     default_set_sd,                   /* set_sd */
  71     no_lookup_name,                   /* lookup_name */
  72     no_open_file,                     /* open_file */
  73     no_close_handle,                  /* close_handle */
  74     ioctl_call_destroy                /* destroy */
  75 };
  76
  77
  78 struct device_manager
  79 {
  80     struct object          obj;           /* object header */
  81     struct list            devices;       /* list of devices */
  82     struct list            requests;      /* list of pending ioctls across all devices */
  83 };
  84
  85 static void device_manager_dump( struct object *obj, int verbose );
  86 static int device_manager_signaled( struct object *obj, struct thread *thread );
  87 static void device_manager_destroy( struct object *obj );
  88
  89 static const struct object_ops device_manager_ops =
  90 {
  91     sizeof(struct device_manager),    /* size */
  92     device_manager_dump,              /* dump */
  93     no_get_type,                      /* get_type */
  94     add_queue,                        /* add_queue */
  95     remove_queue,                     /* remove_queue */
  96     device_manager_signaled,          /* signaled */
  97     no_satisfied,                     /* satisfied */
  98     no_signal,                        /* signal */
  99     no_get_fd,                        /* get_fd */
 100     no_map_access,                    /* map_access */
 101     default_get_sd,                   /* get_sd */
 102     default_set_sd,                   /* set_sd */
 103     no_lookup_name,                   /* lookup_name */
 104     no_open_file,                     /* open_file */
 105     no_close_handle,                  /* close_handle */
 106     device_manager_destroy            /* destroy */
 107 };
 108
 109
 110 struct device
 111 {
 112     struct object          obj;           /* object header */
 113     struct device_manager *manager;       /* manager for this device (or NULL if deleted) */
 114     struct fd             *fd;            /* file descriptor for ioctl */
 115     void                  *user_ptr;      /* opaque ptr for client side */
 116     struct list            entry;         /* entry in device manager list */
 117     struct list            requests;      /* list of pending ioctl requests */
 118 };
 119
 120 static void device_dump( struct object *obj, int verbose );
 121 static struct object_type *device_get_type( struct object *obj );
 122 static struct fd *device_get_fd( struct object *obj );
 123 static void device_destroy( struct object *obj );
 124 static struct object *device_open_file( struct object *obj, unsigned int access,
 125                                         unsigned int sharing, unsigned int options );
 126 static enum server_fd_type device_get_fd_type( struct fd *fd );
 127 static obj_handle_t device_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
 128                                   const void *data, data_size_t size );
 129
 130 static const struct object_ops device_ops =
 131 {
 132     sizeof(struct device),            /* size */
 133     device_dump,                      /* dump */
 134     device_get_type,                  /* get_type */
 135     no_add_queue,                     /* add_queue */
 136     NULL,                             /* remove_queue */
 137     NULL,                             /* signaled */
 138     no_satisfied,                     /* satisfied */
 139     no_signal,                        /* signal */
 140     device_get_fd,                    /* get_fd */
 141     default_fd_map_access,            /* map_access */
 142     default_get_sd,                   /* get_sd */
 143     default_set_sd,                   /* set_sd */
 144     no_lookup_name,                   /* lookup_name */
 145     device_open_file,                 /* open_file */
 146     no_close_handle,                  /* close_handle */
 147     device_destroy                    /* destroy */
 148 };
 149
 150 static const struct fd_ops device_fd_ops =
 151 {
 152     default_fd_get_poll_events,       /* get_poll_events */
 153     default_poll_event,               /* poll_event */
 154     no_flush,                         /* flush */
 155     device_get_fd_type,               /* get_fd_type */
 156     device_ioctl,                     /* ioctl */
 157     default_fd_queue_async,           /* queue_async */
 158     default_fd_reselect_async,        /* reselect_async */
 159     default_fd_cancel_async           /* cancel_async */
 160 };
 161
 162
 163 static void ioctl_call_dump( struct object *obj, int verbose )
 164 {
 165     struct ioctl_call *ioctl = (struct ioctl_call *)obj;
 166     fprintf( stderr, "Ioctl call code=%08x device=%p\n", ioctl->code, ioctl->device );
 167 }
 168
 169 static int ioctl_call_signaled( struct object *obj, struct thread *thread )
 170 {
 171     struct ioctl_call *ioctl = (struct ioctl_call *)obj;
 172
 173     return !ioctl->device;  /* device is cleared once the ioctl has completed */
 174 }
 175
 176 static void ioctl_call_destroy( struct object *obj )
 177 {
 178     struct ioctl_call *ioctl = (struct ioctl_call *)obj;
 179
 180     free( ioctl->in_data );
 181     free( ioctl->out_data );
 182     if (ioctl->async)
 183     {
 184         async_terminate( ioctl->async, STATUS_CANCELLED );
 185         release_object( ioctl->async );
 186     }
 187     if (ioctl->device) release_object( ioctl->device );
 188     release_object( ioctl->thread );
 189 }
 190
 191 static struct ioctl_call *create_ioctl( struct device *device, ioctl_code_t code,
 192                                         const void *in_data, data_size_t in_size,
 193                                         data_size_t out_size )
 194 {
 195     struct ioctl_call *ioctl;
 196
 197     if ((ioctl = alloc_object( &ioctl_call_ops )))
 198     {
 199         ioctl->device   = (struct device *)grab_object( device );
 200         ioctl->code     = code;
 201         ioctl->async    = NULL;
 202         ioctl->status   = STATUS_PENDING;
 203         ioctl->in_size  = in_size;
 204         ioctl->in_data  = NULL;
 205         ioctl->out_size = out_size;
 206         ioctl->out_data = NULL;
 207
 208         if (ioctl->in_size && !(ioctl->in_data = memdup( in_data, in_size )))
 209         {
 210             release_object( ioctl );
 211             ioctl = NULL;
 212         }
 213     }
 214     return ioctl;
 215 }
 216
 217 static void set_ioctl_result( struct ioctl_call *ioctl, unsigned int status,
 218                               const void *out_data, data_size_t out_size )
 219 {
 220     struct device *device = ioctl->device;
 221
 222     if (!device) return;  /* already finished */
 223
 224     /* FIXME: handle the STATUS_PENDING case */
 225     ioctl->status = status;
 226     ioctl->out_size = min( ioctl->out_size, out_size );
 227     if (ioctl->out_size && !(ioctl->out_data = memdup( out_data, ioctl->out_size )))
 228         ioctl->out_size = 0;
 229     release_object( device );
 230     ioctl->device = NULL;
 231     if (ioctl->async)
 232     {
 233         if (ioctl->out_size) status = STATUS_ALERTED;
 234         async_terminate( ioctl->async, status );
 235         release_object( ioctl->async );
 236         ioctl->async = NULL;
 237     }
 238     wake_up( &ioctl->obj, 0 );
 239
 240     if (status != STATUS_ALERTED)
 241     {
 242         /* remove it from the device queue */
 243         /* (for STATUS_ALERTED this will be done in get_ioctl_result) */
 244         list_remove( &ioctl->dev_entry );
 245         release_object( ioctl );  /* no longer on the device queue */
 246     }
 247 }
 248
 249
 250 static void device_dump( struct object *obj, int verbose )
 251 {
 252     struct device *device = (struct device *)obj;
 253
 254     fprintf( stderr, "Device " );
 255     dump_object_name( &device->obj );
 256     fputc( '\n', stderr );
 257 }
 258
 259 static struct object_type *device_get_type( struct object *obj )
 260 {
 261     static const WCHAR name[] = {'D','e','v','i','c','e'};
 262     static const struct unicode_str str = { name, sizeof(name) };
 263     return get_object_type( &str );
 264 }
 265
 266 static struct fd *device_get_fd( struct object *obj )
 267 {
 268     struct device *device = (struct device *)obj;
 269
 270     return (struct fd *)grab_object( device->fd );
 271 }
 272
 273 static void device_destroy( struct object *obj )
 274 {
 275     struct device *device = (struct device *)obj;
 276     struct ioctl_call *ioctl, *next;
 277
 278     LIST_FOR_EACH_ENTRY_SAFE( ioctl, next, &device->requests, struct ioctl_call, dev_entry )
 279     {
 280         list_remove( &ioctl->dev_entry );
 281         release_object( ioctl );  /* no longer on the device queue */
 282     }
 283     if (device->fd) release_object( device->fd );
 284     if (device->manager) list_remove( &device->entry );
 285 }
 286
 287 static struct object *device_open_file( struct object *obj, unsigned int access,
 288                                         unsigned int sharing, unsigned int options )
 289 {
 290     return grab_object( obj );
 291 }
 292
 293 static enum server_fd_type device_get_fd_type( struct fd *fd )
 294 {
 295     return FD_TYPE_DEVICE;
 296 }
 297
 298 static struct ioctl_call *find_ioctl_call( struct device *device, struct thread *thread,
 299                                            void *user_arg )
 300 {
 301     struct ioctl_call *ioctl;
 302
 303     LIST_FOR_EACH_ENTRY( ioctl, &device->requests, struct ioctl_call, dev_entry )
 304         if (ioctl->thread == thread && ioctl->user_arg == user_arg) return ioctl;
 305
 306     set_error( STATUS_INVALID_PARAMETER );
 307     return NULL;
 308 }
 309
 310 static obj_handle_t device_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
 311                                   const void *data, data_size_t size )
 312 {
 313     struct device *device = get_fd_user( fd );
 314     struct ioctl_call *ioctl;
 315     obj_handle_t handle;
 316
 317     if (!device->manager)  /* it has been deleted */
 318     {
 319         set_error( STATUS_FILE_DELETED );
 320         return 0;
 321     }
 322
 323     if (!(ioctl = create_ioctl( device, code, data, size, get_reply_max_size() )))
 324         return 0;
 325
 326     ioctl->thread   = (struct thread *)grab_object( current );
 327     ioctl->user_arg = async_data->arg;
 328
 329     if (!(handle = alloc_handle( current->process, ioctl, SYNCHRONIZE, 0 )))
 330     {
 331         release_object( ioctl );
 332         return 0;
 333     }
 334
 335     if (!(ioctl->async = fd_queue_async( device->fd, async_data, ASYNC_TYPE_WAIT, 0 )))
 336     {
 337         close_handle( current->process, handle );
 338         release_object( ioctl );
 339         return 0;
 340     }
 341     list_add_tail( &device->requests, &ioctl->dev_entry );
 342     list_add_tail( &device->manager->requests, &ioctl->mgr_entry );
 343     if (list_head( &device->manager->requests ) == &ioctl->mgr_entry)  /* first one */
 344         wake_up( &device->manager->obj, 0 );
 345     /* don't release ioctl since it is now queued in the device */
 346     set_error( STATUS_PENDING );
 347     return handle;
 348 }
 349
 350 static struct device *create_device( struct directory *root, const struct unicode_str *name,
 351                                      struct device_manager *manager, unsigned int attr )
 352 {
 353     struct device *device;
 354
 355     if ((device = create_named_object_dir( root, name, attr, &device_ops )))
 356     {
 357         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 358         {
 359             /* initialize it if it didn't already exist */
 360             device->manager = manager;
 361             list_add_tail( &manager->devices, &device->entry );
 362             list_init( &device->requests );
 363             if (!(device->fd = alloc_pseudo_fd( &device_fd_ops, &device->obj, 0 )))
 364             {
 365                 release_object( device );
 366                 device = NULL;
 367             }
 368         }
 369     }
 370     return device;
 371 }
 372
 373 static void delete_device( struct device *device )
 374 {
 375     struct ioctl_call *ioctl, *next;
 376
 377     if (!device->manager) return;  /* already deleted */
 378
 379     /* terminate all pending requests */
 380     LIST_FOR_EACH_ENTRY_SAFE( ioctl, next, &device->requests, struct ioctl_call, dev_entry )
 381     {
 382         list_remove( &ioctl->mgr_entry );
 383         set_ioctl_result( ioctl, STATUS_FILE_DELETED, NULL, 0 );
 384     }
 385     unlink_named_object( &device->obj );
 386     list_remove( &device->entry );
 387     device->manager = NULL;
 388 }
 389
 390
 391 static void device_manager_dump( struct object *obj, int verbose )
 392 {
 393     fprintf( stderr, "Device manager\n" );
 394 }
 395
 396 static int device_manager_signaled( struct object *obj, struct thread *thread )
 397 {
 398     struct device_manager *manager = (struct device_manager *)obj;
 399
 400     return !list_empty( &manager->requests );
 401 }
 402
 403 static void device_manager_destroy( struct object *obj )
 404 {
 405     struct device_manager *manager = (struct device_manager *)obj;
 406     struct list *ptr;
 407
 408     while ((ptr = list_head( &manager->devices )))
 409     {
 410         struct device *device = LIST_ENTRY( ptr, struct device, entry );
 411         delete_device( device );
 412     }
 413 }
 414
 415 static struct device_manager *create_device_manager(void)
 416 {
 417     struct device_manager *manager;
 418
 419     if ((manager = alloc_object( &device_manager_ops )))
 420     {
 421         list_init( &manager->devices );
 422         list_init( &manager->requests );
 423     }
 424     return manager;
 425 }
 426
 427
 428 /* create a device manager */
 429 DECL_HANDLER(create_device_manager)
 430 {
 431     struct device_manager *manager = create_device_manager();
 432
 433     if (manager)
 434     {
 435         reply->handle = alloc_handle( current->process, manager, req->access, req->attributes );
 436         release_object( manager );
 437     }
 438 }
 439
 440
 441 /* create a device */
 442 DECL_HANDLER(create_device)
 443 {
 444     struct device *device;
 445     struct unicode_str name;
 446     struct device_manager *manager;
 447     struct directory *root = NULL;
 448
 449     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 450                                                              0, &device_manager_ops )))
 451         return;
 452
 453     get_req_unicode_str( &name );
 454     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 455     {
 456         release_object( manager );
 457         return;
 458     }
 459
 460     if ((device = create_device( root, &name, manager, req->attributes )))
 461     {
 462         device->user_ptr = req->user_ptr;
 463         reply->handle = alloc_handle( current->process, device, req->access, req->attributes );
 464         release_object( device );
 465     }
 466
 467     if (root) release_object( root );
 468     release_object( manager );
 469 }
 470
 471
 472 /* delete a device */
 473 DECL_HANDLER(delete_device)
 474 {
 475     struct device *device;
 476
 477     if ((device = (struct device *)get_handle_obj( current->process, req->handle, 0, &device_ops )))
 478     {
 479         delete_device( device );
 480         release_object( device );
 481     }
 482 }
 483
 484
 485 /* retrieve the next pending device ioctl request */
 486 DECL_HANDLER(get_next_device_request)
 487 {
 488     struct ioctl_call *ioctl;
 489     struct device_manager *manager;
 490     struct list *ptr;
 491
 492     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 493                                                              0, &device_manager_ops )))
 494         return;
 495
 496     if (req->prev)
 497     {
 498         if ((ioctl = (struct ioctl_call *)get_handle_obj( current->process, req->prev,
 499                                                           0, &ioctl_call_ops )))
 500         {
 501             set_ioctl_result( ioctl, req->status, get_req_data(), get_req_data_size() );
 502             close_handle( current->process, req->prev );  /* avoid an extra round-trip for close */
 503             release_object( ioctl );
 504         }
 505         clear_error();
 506     }
 507
 508     if ((ptr = list_head( &manager->requests )))
 509     {
 510         ioctl = LIST_ENTRY( ptr, struct ioctl_call, mgr_entry );
 511         reply->code = ioctl->code;
 512         reply->user_ptr = ioctl->device->user_ptr;
 513         reply->in_size = ioctl->in_size;
 514         reply->out_size = ioctl->out_size;
 515         if (ioctl->in_size > get_reply_max_size()) set_error( STATUS_BUFFER_OVERFLOW );
 516         else if ((reply->next = alloc_handle( current->process, ioctl, 0, 0 )))
 517         {
 518             set_reply_data_ptr( ioctl->in_data, ioctl->in_size );
 519             ioctl->in_data = NULL;
 520             ioctl->in_size = 0;
 521             list_remove( &ioctl->mgr_entry );
 522             list_init( &ioctl->mgr_entry );
 523         }
 524     }
 525     else set_error( STATUS_PENDING );
 526
 527     release_object( manager );
 528 }
 529
 530
 531 /* retrieve results of an async ioctl */
 532 DECL_HANDLER(get_ioctl_result)
 533 {
 534     struct device *device;
 535     struct ioctl_call *ioctl;
 536
 537     if (!(device = (struct device *)get_handle_obj( current->process, req->handle, 0, &device_ops )))
 538         return;
 539
 540     if ((ioctl = find_ioctl_call( device, current, req->user_arg )))
 541     {
 542         if (ioctl->out_data)
 543         {
 544             data_size_t size = min( ioctl->out_size, get_reply_max_size() );
 545             if (size)
 546             {
 547                 set_reply_data_ptr( ioctl->out_data, size );
 548                 ioctl->out_data = NULL;
 549             }
 550         }
 551         set_error( ioctl->status );
 552         list_remove( &ioctl->dev_entry );
 553         release_object( ioctl );  /* no longer on the device queue */
 554     }
 555     release_object( device );
 556 }