server/mailslot.c

   1 /*
   2  * Server-side mailslot management
   3  *
   4  * Copyright (C) 1998 Alexandre Julliard
   5  * Copyright (C) 2005 Mike McCormack
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  *
  21  */
  22
  23 #include "config.h"
  24 #include "wine/port.h"
  25 #include "ntstatus.h"
  26 #define WIN32_NO_STATUS
  27 #include "wine/unicode.h"
  28
  29 #include <assert.h>
  30 #include <fcntl.h>
  31 #include <string.h>
  32 #include <stdarg.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <sys/time.h>
  36 #include <sys/types.h>
  37
  38 #ifdef HAVE_SYS_IOCTL_H
  39 #include <sys/ioctl.h>
  40 #endif
  41 #ifdef HAVE_SYS_SOCKET_H
  42 #include <sys/socket.h>
  43 #endif
  44 #ifdef HAVE_SYS_FILIO_H
  45 #include <sys/filio.h>
  46 #endif
  47 #include "windef.h"
  48 #include "winternl.h"
  49
  50 #include "file.h"
  51 #include "handle.h"
  52 #include "thread.h"
  53 #include "request.h"
  54
  55 struct mailslot
  56 {
  57     struct object       obj;
  58     struct fd          *fd;
  59     struct fd          *write_fd;
  60     unsigned int        max_msgsize;
  61     int                 read_timeout;
  62     struct list         writers;
  63 };
  64
  65 /* mailslot functions */
  66 static void mailslot_dump( struct object*, int );
  67 static struct fd *mailslot_get_fd( struct object * );
  68 static unsigned int mailslot_map_access( struct object *obj, unsigned int access );
  69 static void mailslot_destroy( struct object * );
  70
  71 static const struct object_ops mailslot_ops =
  72 {
  73     sizeof(struct mailslot),   /* size */
  74     mailslot_dump,             /* dump */
  75     default_fd_add_queue,      /* add_queue */
  76     default_fd_remove_queue,   /* remove_queue */
  77     default_fd_signaled,       /* signaled */
  78     no_satisfied,              /* satisfied */
  79     no_signal,                 /* signal */
  80     mailslot_get_fd,           /* get_fd */
  81     mailslot_map_access,       /* map_access */
  82     no_lookup_name,            /* lookup_name */
  83     no_close_handle,           /* close_handle */
  84     mailslot_destroy           /* destroy */
  85 };
  86
  87 static int mailslot_get_info( struct fd * );
  88 static void mailslot_queue_async( struct fd *, void*, void*, void*, int, int );
  89
  90 static const struct fd_ops mailslot_fd_ops =
  91 {
  92     default_fd_get_poll_events, /* get_poll_events */
  93     default_poll_event,         /* poll_event */
  94     no_flush,                   /* flush */
  95     mailslot_get_info,          /* get_file_info */
  96     mailslot_queue_async,       /* queue_async */
  97     default_fd_cancel_async     /* cancel_async */
  98 };
  99
 100
 101 struct mail_writer
 102 {
 103     struct object         obj;
 104     struct mailslot      *mailslot;
 105     struct list           entry;
 106     unsigned int          access;
 107     unsigned int          sharing;
 108 };
 109
 110 static void mail_writer_dump( struct object *obj, int verbose );
 111 static struct fd *mail_writer_get_fd( struct object *obj );
 112 static unsigned int mail_writer_map_access( struct object *obj, unsigned int access );
 113 static void mail_writer_destroy( struct object *obj);
 114
 115 static const struct object_ops mail_writer_ops =
 116 {
 117     sizeof(struct mail_writer), /* size */
 118     mail_writer_dump,           /* dump */
 119     no_add_queue,               /* add_queue */
 120     NULL,                       /* remove_queue */
 121     NULL,                       /* signaled */
 122     NULL,                       /* satisfied */
 123     no_signal,                  /* signal */
 124     mail_writer_get_fd,         /* get_fd */
 125     mail_writer_map_access,     /* map_access */
 126     no_lookup_name,             /* lookup_name */
 127     no_close_handle,            /* close_handle */
 128     mail_writer_destroy         /* destroy */
 129 };
 130
 131 static int mail_writer_get_info( struct fd *fd );
 132
 133 static const struct fd_ops mail_writer_fd_ops =
 134 {
 135     NULL,                        /* get_poll_events */
 136     NULL,                        /* poll_event */
 137     no_flush,                    /* flush */
 138     mail_writer_get_info,        /* get_file_info */
 139     no_queue_async,              /* queue_async */
 140     NULL                         /* cancel_async */
 141 };
 142
 143
 144 struct mailslot_device
 145 {
 146     struct object       obj;         /* object header */
 147     struct fd          *fd;          /* pseudo-fd for ioctls */
 148     struct namespace   *mailslots;   /* mailslot namespace */
 149 };
 150
 151 static void mailslot_device_dump( struct object *obj, int verbose );
 152 static struct fd *mailslot_device_get_fd( struct object *obj );
 153 static struct object *mailslot_device_lookup_name( struct object *obj, struct unicode_str *name,
 154                                                    unsigned int attr );
 155 static void mailslot_device_destroy( struct object *obj );
 156 static int mailslot_device_get_file_info( struct fd *fd );
 157
 158 static const struct object_ops mailslot_device_ops =
 159 {
 160     sizeof(struct mailslot_device), /* size */
 161     mailslot_device_dump,           /* dump */
 162     no_add_queue,                   /* add_queue */
 163     NULL,                           /* remove_queue */
 164     NULL,                           /* signaled */
 165     no_satisfied,                   /* satisfied */
 166     no_signal,                      /* signal */
 167     mailslot_device_get_fd,         /* get_fd */
 168     no_map_access,                  /* map_access */
 169     mailslot_device_lookup_name,    /* lookup_name */
 170     no_close_handle,                /* close_handle */
 171     mailslot_device_destroy         /* destroy */
 172 };
 173
 174 static const struct fd_ops mailslot_device_fd_ops =
 175 {
 176     default_fd_get_poll_events,     /* get_poll_events */
 177     default_poll_event,             /* poll_event */
 178     no_flush,                       /* flush */
 179     mailslot_device_get_file_info,  /* get_file_info */
 180     default_fd_queue_async,         /* queue_async */
 181     default_fd_cancel_async         /* cancel_async */
 182 };
 183
 184 static void mailslot_destroy( struct object *obj)
 185 {
 186     struct mailslot *mailslot = (struct mailslot *) obj;
 187
 188     assert( mailslot->fd );
 189     assert( mailslot->write_fd );
 190
 191     release_object( mailslot->fd );
 192     release_object( mailslot->write_fd );
 193 }
 194
 195 static void mailslot_dump( struct object *obj, int verbose )
 196 {
 197     struct mailslot *mailslot = (struct mailslot *) obj;
 198
 199     assert( obj->ops == &mailslot_ops );
 200     fprintf( stderr, "Mailslot max_msgsize=%d read_timeout=%d\n",
 201              mailslot->max_msgsize, mailslot->read_timeout );
 202 }
 203
 204 static int mailslot_message_count(struct mailslot *mailslot)
 205 {
 206     struct pollfd pfd;
 207
 208     /* poll the socket to see if there's any messages */
 209     pfd.fd = get_unix_fd( mailslot->fd );
 210     pfd.events = POLLIN;
 211     pfd.revents = 0;
 212     return (poll( &pfd, 1, 0 ) == 1) ? 1 : 0;
 213 }
 214
 215 static int mailslot_next_msg_size( struct mailslot *mailslot )
 216 {
 217     int size, fd;
 218
 219     size = 0;
 220     fd = get_unix_fd( mailslot->fd );
 221     ioctl( fd, FIONREAD, &size );
 222     return size;
 223 }
 224
 225 static int mailslot_get_info( struct fd *fd )
 226 {
 227     struct mailslot *mailslot = get_fd_user( fd );
 228     assert( mailslot->obj.ops == &mailslot_ops );
 229     return FD_FLAG_TIMEOUT | FD_FLAG_AVAILABLE;
 230 }
 231
 232 static struct fd *mailslot_get_fd( struct object *obj )
 233 {
 234     struct mailslot *mailslot = (struct mailslot *) obj;
 235
 236     return (struct fd *)grab_object( mailslot->fd );
 237 }
 238
 239 static unsigned int mailslot_map_access( struct object *obj, unsigned int access )
 240 {
 241     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 242     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 243     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 244     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 245     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 246 }
 247
 248 static void mailslot_queue_async( struct fd *fd, void *apc, void *user,
 249                                   void *iosb, int type, int count )
 250 {
 251     struct mailslot *mailslot = get_fd_user( fd );
 252
 253     assert(mailslot->obj.ops == &mailslot_ops);
 254
 255     if (type != ASYNC_TYPE_READ)
 256     {
 257         set_error(STATUS_INVALID_PARAMETER);
 258         return;
 259     }
 260
 261     if (list_empty( &mailslot->writers ) ||
 262         !mailslot_message_count( mailslot ))
 263     {
 264         set_error(STATUS_IO_TIMEOUT);
 265         return;
 266     }
 267
 268     if (mailslot->read_timeout != -1)
 269     {
 270         struct timeval when = current_time;
 271         add_timeout( &when, mailslot->read_timeout );
 272         fd_queue_async_timeout( fd, apc, user, iosb, type, count, &when );
 273     }
 274     else fd_queue_async_timeout( fd, apc, user, iosb, type, count, NULL );
 275 }
 276
 277 static void mailslot_device_dump( struct object *obj, int verbose )
 278 {
 279     assert( obj->ops == &mailslot_device_ops );
 280     fprintf( stderr, "Mail slot device\n" );
 281 }
 282
 283 static struct fd *mailslot_device_get_fd( struct object *obj )
 284 {
 285     struct mailslot_device *device = (struct mailslot_device *)obj;
 286     return (struct fd *)grab_object( device->fd );
 287 }
 288
 289 static struct object *mailslot_device_lookup_name( struct object *obj, struct unicode_str *name,
 290                                                    unsigned int attr )
 291 {
 292     struct mailslot_device *device = (struct mailslot_device*)obj;
 293     struct object *found;
 294
 295     assert( obj->ops == &mailslot_device_ops );
 296
 297     if ((found = find_object( device->mailslots, name, attr | OBJ_CASE_INSENSITIVE )))
 298         name->len = 0;
 299
 300     return found;
 301 }
 302
 303 static void mailslot_device_destroy( struct object *obj )
 304 {
 305     struct mailslot_device *device = (struct mailslot_device*)obj;
 306     assert( obj->ops == &mailslot_device_ops );
 307     if (device->fd) release_object( device->fd );
 308     free( device->mailslots );
 309 }
 310
 311 static int mailslot_device_get_file_info( struct fd *fd )
 312 {
 313     return 0;
 314 }
 315
 316 void create_mailslot_device( struct directory *root, const struct unicode_str *name )
 317 {
 318     struct mailslot_device *dev;
 319
 320     if ((dev = create_named_object_dir( root, name, 0, &mailslot_device_ops )) &&
 321         get_error() != STATUS_OBJECT_NAME_EXISTS)
 322     {
 323         dev->mailslots = NULL;
 324         if (!(dev->fd = alloc_pseudo_fd( &mailslot_device_fd_ops, &dev->obj )) ||
 325             !(dev->mailslots = create_namespace( 7 )))
 326         {
 327             release_object( dev );
 328             dev = NULL;
 329         }
 330     }
 331     if (dev) make_object_static( &dev->obj );
 332 }
 333
 334 static struct mailslot *create_mailslot( struct directory *root,
 335                                          const struct unicode_str *name, unsigned int attr,
 336                                          int max_msgsize, int read_timeout )
 337 {
 338     struct object *obj;
 339     struct unicode_str new_name;
 340     struct mailslot_device *dev;
 341     struct mailslot *mailslot;
 342     int fds[2];
 343
 344     if (!name || !name->len) return alloc_object( &mailslot_ops );
 345
 346     if (!(obj = find_object_dir( root, name, attr, &new_name ))) return NULL;
 347
 348     if (!new_name.len)
 349     {
 350         if (attr & OBJ_OPENIF && obj->ops == &mailslot_ops)
 351             /* it already exists - there can only be one mailslot to read from */
 352             set_error( STATUS_OBJECT_NAME_EXISTS );
 353         else if (attr & OBJ_OPENIF)
 354             set_error( STATUS_OBJECT_TYPE_MISMATCH );
 355         else
 356             set_error( STATUS_OBJECT_NAME_COLLISION );
 357         release_object( obj );
 358         return NULL;
 359     }
 360
 361     if (obj->ops != &mailslot_device_ops)
 362     {
 363         set_error( STATUS_OBJECT_TYPE_MISMATCH );
 364         release_object( obj );
 365         return NULL;
 366     }
 367
 368     dev = (struct mailslot_device *)obj;
 369     mailslot = create_object( dev->mailslots, &mailslot_ops, &new_name, NULL );
 370     release_object( dev );
 371
 372     if (!mailslot) return NULL;
 373
 374     mailslot->fd = NULL;
 375     mailslot->write_fd = NULL;
 376     mailslot->max_msgsize = max_msgsize;
 377     mailslot->read_timeout = read_timeout;
 378     list_init( &mailslot->writers );
 379
 380     if (!socketpair( PF_UNIX, SOCK_DGRAM, 0, fds ))
 381     {
 382         fcntl( fds[0], F_SETFL, O_NONBLOCK );
 383         fcntl( fds[1], F_SETFL, O_NONBLOCK );
 384         mailslot->fd = create_anonymous_fd( &mailslot_fd_ops,
 385                                 fds[1], &mailslot->obj );
 386         mailslot->write_fd = create_anonymous_fd( &mail_writer_fd_ops,
 387                                 fds[0], &mailslot->obj );
 388         if (mailslot->fd && mailslot->write_fd) return mailslot;
 389     }
 390     else file_set_error();
 391
 392     release_object( mailslot );
 393     return NULL;
 394 }
 395
 396 static void mail_writer_dump( struct object *obj, int verbose )
 397 {
 398     fprintf( stderr, "Mailslot writer\n" );
 399 }
 400
 401 static void mail_writer_destroy( struct object *obj)
 402 {
 403     struct mail_writer *writer = (struct mail_writer *) obj;
 404
 405     list_remove( &writer->entry );
 406     release_object( writer->mailslot );
 407 }
 408
 409 static int mail_writer_get_info( struct fd *fd )
 410 {
 411     return 0;
 412 }
 413
 414 static struct fd *mail_writer_get_fd( struct object *obj )
 415 {
 416     struct mail_writer *writer = (struct mail_writer *) obj;
 417
 418     return (struct fd *)grab_object( writer->mailslot->write_fd );
 419 }
 420
 421 static unsigned int mail_writer_map_access( struct object *obj, unsigned int access )
 422 {
 423     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 424     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 425     if (access & GENERIC_EXECUTE) access |= FILE_GENERIC_EXECUTE;
 426     if (access & GENERIC_ALL)     access |= FILE_ALL_ACCESS;
 427     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 428 }
 429
 430 /*
 431  * Readers and writers cannot be mixed.
 432  * If there's more than one writer, all writers must open with FILE_SHARE_WRITE
 433  */
 434 static struct mail_writer *create_mail_writer( struct mailslot *mailslot, unsigned int access,
 435                                                unsigned int sharing )
 436 {
 437     struct mail_writer *writer;
 438
 439     if (!list_empty( &mailslot->writers ))
 440     {
 441         writer = LIST_ENTRY( list_head(&mailslot->writers), struct mail_writer, entry );
 442
 443         if (((access & (GENERIC_WRITE|FILE_WRITE_DATA)) || (writer->access & FILE_WRITE_DATA)) &&
 444            !((sharing & FILE_SHARE_WRITE) && (writer->sharing & FILE_SHARE_WRITE)))
 445         {
 446             set_error( STATUS_SHARING_VIOLATION );
 447             return NULL;
 448         }
 449     }
 450
 451     writer = alloc_object( &mail_writer_ops );
 452     if (!writer)
 453         return NULL;
 454
 455     grab_object( mailslot );
 456     writer->mailslot = mailslot;
 457     writer->access   = mail_writer_map_access( &writer->obj, access );
 458     writer->sharing  = sharing;
 459
 460     list_add_head( &mailslot->writers, &writer->entry );
 461
 462     return writer;
 463 }
 464
 465 static struct mailslot *get_mailslot_obj( struct process *process, obj_handle_t handle,
 466                                           unsigned int access )
 467 {
 468     return (struct mailslot *)get_handle_obj( process, handle, access, &mailslot_ops );
 469 }
 470
 471
 472 /* create a mailslot */
 473 DECL_HANDLER(create_mailslot)
 474 {
 475     struct mailslot *mailslot;
 476     struct unicode_str name;
 477     struct directory *root = NULL;
 478
 479     reply->handle = 0;
 480     get_req_unicode_str( &name );
 481     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 482         return;
 483
 484     if ((mailslot = create_mailslot( root, &name, req->attributes, req->max_msgsize,
 485                                      req->read_timeout )))
 486     {
 487         reply->handle = alloc_handle( current->process, mailslot, req->access, req->attributes );
 488         release_object( mailslot );
 489     }
 490
 491     if (root) release_object( root );
 492 }
 493
 494
 495 /* open an existing mailslot */
 496 DECL_HANDLER(open_mailslot)
 497 {
 498     struct mailslot *mailslot;
 499     struct unicode_str name;
 500     struct directory *root = NULL;
 501
 502     reply->handle = 0;
 503     get_req_unicode_str( &name );
 504
 505     if (!(req->sharing & FILE_SHARE_READ))
 506     {
 507         set_error( STATUS_SHARING_VIOLATION );
 508         return;
 509     }
 510
 511     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 512         return;
 513     mailslot = open_object_dir( root, &name, req->attributes, &mailslot_ops );
 514     if (root) release_object( root );
 515
 516     if (mailslot)
 517     {
 518         struct mail_writer *writer;
 519
 520         writer = create_mail_writer( mailslot, req->access, req->sharing );
 521         if (writer)
 522         {
 523             reply->handle = alloc_handle( current->process, writer, req->access, req->attributes );
 524             release_object( writer );
 525         }
 526         release_object( mailslot );
 527     }
 528     else
 529         set_error( STATUS_NO_SUCH_FILE );
 530 }
 531
 532
 533 /* set mailslot information */
 534 DECL_HANDLER(set_mailslot_info)
 535 {
 536     struct mailslot *mailslot = get_mailslot_obj( current->process, req->handle, 0 );
 537
 538     if (mailslot)
 539     {
 540         if (req->flags & MAILSLOT_SET_READ_TIMEOUT)
 541             mailslot->read_timeout = req->read_timeout;
 542         reply->max_msgsize = mailslot->max_msgsize;
 543         reply->read_timeout = mailslot->read_timeout;
 544         reply->msg_count = mailslot_message_count(mailslot);
 545
 546         /* get the size of the next message */
 547         if (reply->msg_count)
 548             reply->next_msgsize = mailslot_next_msg_size(mailslot);
 549         else
 550             reply->next_msgsize = MAILSLOT_NO_MESSAGE;
 551
 552         release_object( mailslot );
 553     }
 554 }