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
  28 #include <assert.h>
  29 #include <fcntl.h>
  30 #include <string.h>
  31 #include <stdarg.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <sys/time.h>
  35 #include <sys/types.h>
  36
  37 #ifdef HAVE_SYS_IOCTL_H
  38 #include <sys/ioctl.h>
  39 #endif
  40 #ifdef HAVE_SYS_SOCKET_H
  41 #include <sys/socket.h>
  42 #endif
  43 #ifdef HAVE_SYS_FILIO_H
  44 #include <sys/filio.h>
  45 #endif
  46 #include "windef.h"
  47 #include "winternl.h"
  48
  49 #include "file.h"
  50 #include "handle.h"
  51 #include "thread.h"
  52 #include "request.h"
  53
  54 struct mailslot
  55 {
  56     struct object       obj;
  57     struct fd          *fd;
  58     int                 write_fd;
  59     unsigned int        max_msgsize;
  60     timeout_t           read_timeout;
  61     struct list         writers;
  62 };
  63
  64 /* mailslot functions */
  65 static void mailslot_dump( struct object*, int );
  66 static struct fd *mailslot_get_fd( struct object * );
  67 static unsigned int mailslot_map_access( struct object *obj, unsigned int access );
  68 static int mailslot_link_name( struct object *obj, struct object_name *name, struct object *parent );
  69 static struct object *mailslot_open_file( struct object *obj, unsigned int access,
  70                                           unsigned int sharing, unsigned int options );
  71 static void mailslot_destroy( struct object * );
  72
  73 static const struct object_ops mailslot_ops =
  74 {
  75     sizeof(struct mailslot),   /* size */
  76     mailslot_dump,             /* dump */
  77     file_get_type,             /* get_type */
  78     add_queue,                 /* add_queue */
  79     remove_queue,              /* remove_queue */
  80     default_fd_signaled,       /* signaled */
  81     no_satisfied,              /* satisfied */
  82     no_signal,                 /* signal */
  83     mailslot_get_fd,           /* get_fd */
  84     mailslot_map_access,       /* map_access */
  85     default_get_sd,            /* get_sd */
  86     default_set_sd,            /* set_sd */
  87     default_get_full_name,     /* get_full_name */
  88     no_lookup_name,            /* lookup_name */
  89     mailslot_link_name,        /* link_name */
  90     default_unlink_name,       /* unlink_name */
  91     mailslot_open_file,        /* open_file */
  92     no_kernel_obj_list,        /* get_kernel_obj_list */
  93     fd_close_handle,           /* close_handle */
  94     mailslot_destroy           /* destroy */
  95 };
  96
  97 static enum server_fd_type mailslot_get_fd_type( struct fd *fd );
  98 static void mailslot_queue_async( struct fd *fd, struct async *async, int type, int count );
  99
 100 static const struct fd_ops mailslot_fd_ops =
 101 {
 102     default_fd_get_poll_events, /* get_poll_events */
 103     default_poll_event,         /* poll_event */
 104     mailslot_get_fd_type,       /* get_fd_type */
 105     no_fd_read,                 /* read */
 106     no_fd_write,                /* write */
 107     no_fd_flush,                /* flush */
 108     default_fd_get_file_info,   /* get_file_info */
 109     no_fd_get_volume_info,      /* get_volume_info */
 110     default_fd_ioctl,           /* ioctl */
 111     mailslot_queue_async,       /* queue_async */
 112     default_fd_reselect_async   /* reselect_async */
 113 };
 114
 115
 116 struct mail_writer
 117 {
 118     struct object         obj;
 119     struct fd            *fd;
 120     struct mailslot      *mailslot;
 121     struct list           entry;
 122     unsigned int          access;
 123     unsigned int          sharing;
 124 };
 125
 126 static void mail_writer_dump( struct object *obj, int verbose );
 127 static struct fd *mail_writer_get_fd( struct object *obj );
 128 static unsigned int mail_writer_map_access( struct object *obj, unsigned int access );
 129 static void mail_writer_destroy( struct object *obj);
 130
 131 static const struct object_ops mail_writer_ops =
 132 {
 133     sizeof(struct mail_writer), /* size */
 134     mail_writer_dump,           /* dump */
 135     file_get_type,              /* get_type */
 136     no_add_queue,               /* add_queue */
 137     NULL,                       /* remove_queue */
 138     NULL,                       /* signaled */
 139     NULL,                       /* satisfied */
 140     no_signal,                  /* signal */
 141     mail_writer_get_fd,         /* get_fd */
 142     mail_writer_map_access,     /* map_access */
 143     default_get_sd,             /* get_sd */
 144     default_set_sd,             /* set_sd */
 145     no_get_full_name,           /* get_full_name */
 146     no_lookup_name,             /* lookup_name */
 147     no_link_name,               /* link_name */
 148     NULL,                       /* unlink_name */
 149     no_open_file,               /* open_file */
 150     no_kernel_obj_list,         /* get_kernel_obj_list */
 151     fd_close_handle,            /* close_handle */
 152     mail_writer_destroy         /* destroy */
 153 };
 154
 155 static enum server_fd_type mail_writer_get_fd_type( struct fd *fd );
 156
 157 static const struct fd_ops mail_writer_fd_ops =
 158 {
 159     default_fd_get_poll_events,  /* get_poll_events */
 160     default_poll_event,          /* poll_event */
 161     mail_writer_get_fd_type,     /* get_fd_type */
 162     no_fd_read,                  /* read */
 163     no_fd_write,                 /* write */
 164     no_fd_flush,                 /* flush */
 165     default_fd_get_file_info,    /* get_file_info */
 166     no_fd_get_volume_info,       /* get_volume_info */
 167     default_fd_ioctl,            /* ioctl */
 168     default_fd_queue_async,      /* queue_async */
 169     default_fd_reselect_async    /* reselect_async */
 170 };
 171
 172
 173 struct mailslot_device
 174 {
 175     struct object       obj;         /* object header */
 176     struct namespace   *mailslots;   /* mailslot namespace */
 177 };
 178
 179 struct mailslot_device_file
 180 {
 181     struct object           obj;    /* object header */
 182     struct fd              *fd;     /* pseudo-fd for ioctls */
 183     struct mailslot_device *device; /* mailslot device */
 184 };
 185
 186 static void mailslot_device_dump( struct object *obj, int verbose );
 187 static struct object_type *mailslot_device_get_type( struct object *obj );
 188 static struct object *mailslot_device_lookup_name( struct object *obj, struct unicode_str *name,
 189                                                    unsigned int attr );
 190 static struct object *mailslot_device_open_file( struct object *obj, unsigned int access,
 191                                                  unsigned int sharing, unsigned int options );
 192 static void mailslot_device_destroy( struct object *obj );
 193
 194 static const struct object_ops mailslot_device_ops =
 195 {
 196     sizeof(struct mailslot_device), /* size */
 197     mailslot_device_dump,           /* dump */
 198     mailslot_device_get_type,       /* get_type */
 199     no_add_queue,                   /* add_queue */
 200     NULL,                           /* remove_queue */
 201     NULL,                           /* signaled */
 202     no_satisfied,                   /* satisfied */
 203     no_signal,                      /* signal */
 204     no_get_fd,                      /* get_fd */
 205     no_map_access,                  /* map_access */
 206     default_get_sd,                 /* get_sd */
 207     default_set_sd,                 /* set_sd */
 208     default_get_full_name,          /* get_full_name */
 209     mailslot_device_lookup_name,    /* lookup_name */
 210     directory_link_name,            /* link_name */
 211     default_unlink_name,            /* unlink_name */
 212     mailslot_device_open_file,      /* open_file */
 213     no_kernel_obj_list,             /* get_kernel_obj_list */
 214     no_close_handle,                /* close_handle */
 215     mailslot_device_destroy         /* destroy */
 216 };
 217
 218 static void mailslot_device_file_dump( struct object *obj, int verbose );
 219 static struct fd *mailslot_device_file_get_fd( struct object *obj );
 220 static WCHAR *mailslot_device_file_get_full_name( struct object *obj, data_size_t *len );
 221 static void mailslot_device_file_destroy( struct object *obj );
 222 static enum server_fd_type mailslot_device_file_get_fd_type( struct fd *fd );
 223
 224 static const struct object_ops mailslot_device_file_ops =
 225 {
 226     sizeof(struct mailslot_device_file),    /* size */
 227     mailslot_device_file_dump,              /* dump */
 228     file_get_type,                          /* get_type */
 229     add_queue,                              /* add_queue */
 230     remove_queue,                           /* remove_queue */
 231     default_fd_signaled,                    /* signaled */
 232     no_satisfied,                           /* satisfied */
 233     no_signal,                              /* signal */
 234     mailslot_device_file_get_fd,            /* get_fd */
 235     default_fd_map_access,                  /* map_access */
 236     default_get_sd,                         /* get_sd */
 237     default_set_sd,                         /* set_sd */
 238     mailslot_device_file_get_full_name,     /* get_full_name */
 239     no_lookup_name,                         /* lookup_name */
 240     no_link_name,                           /* link_name */
 241     NULL,                                   /* unlink_name */
 242     no_open_file,                           /* open_file */
 243     no_kernel_obj_list,                     /* get_kernel_obj_list */
 244     fd_close_handle,                        /* close_handle */
 245     mailslot_device_file_destroy            /* destroy */
 246 };
 247
 248 static const struct fd_ops mailslot_device_fd_ops =
 249 {
 250     default_fd_get_poll_events,         /* get_poll_events */
 251     default_poll_event,                 /* poll_event */
 252     mailslot_device_file_get_fd_type,   /* get_fd_type */
 253     no_fd_read,                         /* read */
 254     no_fd_write,                        /* write */
 255     no_fd_flush,                        /* flush */
 256     default_fd_get_file_info,           /* get_file_info */
 257     no_fd_get_volume_info,              /* get_volume_info */
 258     default_fd_ioctl,                   /* ioctl */
 259     default_fd_queue_async,             /* queue_async */
 260     default_fd_reselect_async           /* reselect_async */
 261 };
 262
 263 static void mailslot_destroy( struct object *obj)
 264 {
 265     struct mailslot *mailslot = (struct mailslot *) obj;
 266
 267     assert( mailslot->fd );
 268
 269     if (mailslot->write_fd != -1)
 270     {
 271         shutdown( mailslot->write_fd, SHUT_RDWR );
 272         close( mailslot->write_fd );
 273     }
 274     release_object( mailslot->fd );
 275 }
 276
 277 static void mailslot_dump( struct object *obj, int verbose )
 278 {
 279     struct mailslot *mailslot = (struct mailslot *) obj;
 280
 281     assert( obj->ops == &mailslot_ops );
 282     fprintf( stderr, "Mailslot max_msgsize=%d read_timeout=%s\n",
 283              mailslot->max_msgsize, get_timeout_str(mailslot->read_timeout) );
 284 }
 285
 286 static enum server_fd_type mailslot_get_fd_type( struct fd *fd )
 287 {
 288     return FD_TYPE_MAILSLOT;
 289 }
 290
 291 static struct fd *mailslot_get_fd( struct object *obj )
 292 {
 293     struct mailslot *mailslot = (struct mailslot *) obj;
 294
 295     return (struct fd *)grab_object( mailslot->fd );
 296 }
 297
 298 static unsigned int mailslot_map_access( struct object *obj, unsigned int access )
 299 {
 300     /* mailslots can only be read */
 301     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 302     if (access & GENERIC_ALL)     access |= FILE_GENERIC_READ;
 303     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 304 }
 305
 306 static int mailslot_link_name( struct object *obj, struct object_name *name, struct object *parent )
 307 {
 308     struct mailslot_device *dev = (struct mailslot_device *)parent;
 309
 310     if (parent->ops != &mailslot_device_ops)
 311     {
 312         set_error( STATUS_OBJECT_NAME_INVALID );
 313         return 0;
 314     }
 315     namespace_add( dev->mailslots, name );
 316     name->parent = grab_object( parent );
 317     return 1;
 318 }
 319
 320 static struct object *mailslot_open_file( struct object *obj, unsigned int access,
 321                                           unsigned int sharing, unsigned int options )
 322 {
 323     struct mailslot *mailslot = (struct mailslot *)obj;
 324     struct mail_writer *writer;
 325     int unix_fd;
 326
 327     if (!(sharing & FILE_SHARE_READ))
 328     {
 329         set_error( STATUS_SHARING_VIOLATION );
 330         return NULL;
 331     }
 332
 333     if (!list_empty( &mailslot->writers ))
 334     {
 335         /* Readers and writers cannot be mixed.
 336          * If there's more than one writer, all writers must open with FILE_SHARE_WRITE
 337          */
 338         writer = LIST_ENTRY( list_head(&mailslot->writers), struct mail_writer, entry );
 339
 340         if (((access & (GENERIC_WRITE|FILE_WRITE_DATA)) || (writer->access & FILE_WRITE_DATA)) &&
 341            !((sharing & FILE_SHARE_WRITE) && (writer->sharing & FILE_SHARE_WRITE)))
 342         {
 343             set_error( STATUS_SHARING_VIOLATION );
 344             return NULL;
 345         }
 346     }
 347
 348     if ((unix_fd = dup( mailslot->write_fd )) == -1)
 349     {
 350         file_set_error();
 351         return NULL;
 352     }
 353     if (!(writer = alloc_object( &mail_writer_ops )))
 354     {
 355         close( unix_fd );
 356         return NULL;
 357     }
 358     grab_object( mailslot );
 359     writer->mailslot = mailslot;
 360     writer->access   = mail_writer_map_access( &writer->obj, access );
 361     writer->sharing  = sharing;
 362     list_add_head( &mailslot->writers, &writer->entry );
 363
 364     if (!(writer->fd = create_anonymous_fd( &mail_writer_fd_ops, unix_fd, &writer->obj, options )))
 365     {
 366         release_object( writer );
 367         return NULL;
 368     }
 369     allow_fd_caching( writer->fd );
 370     return &writer->obj;
 371 }
 372
 373 static void mailslot_queue_async( struct fd *fd, struct async *async, int type, int count )
 374 {
 375     struct mailslot *mailslot = get_fd_user( fd );
 376
 377     assert(mailslot->obj.ops == &mailslot_ops);
 378
 379     fd_queue_async( fd, async, type );
 380     async_set_timeout( async, mailslot->read_timeout ? mailslot->read_timeout : -1,
 381                        STATUS_IO_TIMEOUT );
 382     set_error( STATUS_PENDING );
 383 }
 384
 385 static void mailslot_device_dump( struct object *obj, int verbose )
 386 {
 387     fputs( "Mailslot device\n", stderr );
 388 }
 389
 390 static struct object_type *mailslot_device_get_type( struct object *obj )
 391 {
 392     static const WCHAR name[] = {'D','e','v','i','c','e'};
 393     static const struct unicode_str str = { name, sizeof(name) };
 394     return get_object_type( &str );
 395 }
 396
 397 static struct object *mailslot_device_lookup_name( struct object *obj, struct unicode_str *name,
 398                                                    unsigned int attr )
 399 {
 400     struct mailslot_device *device = (struct mailslot_device*)obj;
 401     struct object *found;
 402
 403     assert( obj->ops == &mailslot_device_ops );
 404
 405     if (!name) return NULL;  /* open the device itself */
 406
 407     if ((found = find_object( device->mailslots, name, attr | OBJ_CASE_INSENSITIVE )))
 408         name->len = 0;
 409
 410     return found;
 411 }
 412
 413 static struct object *mailslot_device_open_file( struct object *obj, unsigned int access,
 414                                                  unsigned int sharing, unsigned int options )
 415 {
 416     struct mailslot_device_file *file;
 417
 418     if (!(file = alloc_object( &mailslot_device_file_ops ))) return NULL;
 419     file->device = (struct mailslot_device *)grab_object( obj );
 420     if (!(file->fd = alloc_pseudo_fd( &mailslot_device_fd_ops, obj, options )))
 421     {
 422         release_object( file );
 423         return NULL;
 424     }
 425     allow_fd_caching( file->fd );
 426     return &file->obj;
 427 }
 428
 429 static void mailslot_device_destroy( struct object *obj )
 430 {
 431     struct mailslot_device *device = (struct mailslot_device*)obj;
 432     assert( obj->ops == &mailslot_device_ops );
 433     free( device->mailslots );
 434 }
 435
 436 struct object *create_mailslot_device( struct object *root, const struct unicode_str *name,
 437                                        unsigned int attr, const struct security_descriptor *sd )
 438 {
 439     struct mailslot_device *dev;
 440
 441     if ((dev = create_named_object( root, &mailslot_device_ops, name, attr, sd )) &&
 442         get_error() != STATUS_OBJECT_NAME_EXISTS)
 443     {
 444         dev->mailslots = NULL;
 445         if (!(dev->mailslots = create_namespace( 7 )))
 446         {
 447             release_object( dev );
 448             dev = NULL;
 449         }
 450     }
 451     return &dev->obj;
 452 }
 453
 454 static void mailslot_device_file_dump( struct object *obj, int verbose )
 455 {
 456     struct mailslot_device_file *file = (struct mailslot_device_file *)obj;
 457
 458     fprintf( stderr, "File on mailslot device %p\n", file->device );
 459 }
 460
 461 static struct fd *mailslot_device_file_get_fd( struct object *obj )
 462 {
 463     struct mailslot_device_file *file = (struct mailslot_device_file *)obj;
 464     return (struct fd *)grab_object( file->fd );
 465 }
 466
 467 static WCHAR *mailslot_device_file_get_full_name( struct object *obj, data_size_t *len )
 468 {
 469     struct mailslot_device_file *file = (struct mailslot_device_file *)obj;
 470     return file->device->obj.ops->get_full_name( &file->device->obj, len );
 471 }
 472
 473 static void mailslot_device_file_destroy( struct object *obj )
 474 {
 475     struct mailslot_device_file *file = (struct mailslot_device_file*)obj;
 476     assert( obj->ops == &mailslot_device_file_ops );
 477     if (file->fd) release_object( file->fd );
 478     release_object( file->device );
 479 }
 480
 481 static enum server_fd_type mailslot_device_file_get_fd_type( struct fd *fd )
 482 {
 483     return FD_TYPE_DEVICE;
 484 }
 485
 486 static struct mailslot *create_mailslot( struct object *root,
 487                                          const struct unicode_str *name, unsigned int attr,
 488                                          int max_msgsize, timeout_t read_timeout,
 489                                          const struct security_descriptor *sd )
 490 {
 491     struct mailslot *mailslot;
 492     int fds[2];
 493
 494     if (!(mailslot = create_named_object( root, &mailslot_ops, name, attr, sd ))) return NULL;
 495
 496     mailslot->fd = NULL;
 497     mailslot->write_fd = -1;
 498     mailslot->max_msgsize = max_msgsize;
 499     mailslot->read_timeout = read_timeout;
 500     list_init( &mailslot->writers );
 501
 502     if (!socketpair( PF_UNIX, SOCK_DGRAM, 0, fds ))
 503     {
 504         fcntl( fds[0], F_SETFL, O_NONBLOCK );
 505         fcntl( fds[1], F_SETFL, O_NONBLOCK );
 506         shutdown( fds[0], SHUT_RD );
 507         mailslot->write_fd = fds[0];
 508         if ((mailslot->fd = create_anonymous_fd( &mailslot_fd_ops, fds[1], &mailslot->obj,
 509                                                  FILE_SYNCHRONOUS_IO_NONALERT )))
 510         {
 511             allow_fd_caching( mailslot->fd );
 512             return mailslot;
 513         }
 514     }
 515     else file_set_error();
 516
 517     release_object( mailslot );
 518     return NULL;
 519 }
 520
 521 static void mail_writer_dump( struct object *obj, int verbose )
 522 {
 523     fprintf( stderr, "Mailslot writer\n" );
 524 }
 525
 526 static void mail_writer_destroy( struct object *obj)
 527 {
 528     struct mail_writer *writer = (struct mail_writer *) obj;
 529
 530     if (writer->fd) release_object( writer->fd );
 531     list_remove( &writer->entry );
 532     release_object( writer->mailslot );
 533 }
 534
 535 static enum server_fd_type mail_writer_get_fd_type( struct fd *fd )
 536 {
 537     return FD_TYPE_MAILSLOT;
 538 }
 539
 540 static struct fd *mail_writer_get_fd( struct object *obj )
 541 {
 542     struct mail_writer *writer = (struct mail_writer *) obj;
 543     return (struct fd *)grab_object( writer->fd );
 544 }
 545
 546 static unsigned int mail_writer_map_access( struct object *obj, unsigned int access )
 547 {
 548     /* mailslot writers can only get write access */
 549     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 550     if (access & GENERIC_ALL)     access |= FILE_GENERIC_WRITE;
 551     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 552 }
 553
 554 static struct mailslot *get_mailslot_obj( struct process *process, obj_handle_t handle,
 555                                           unsigned int access )
 556 {
 557     return (struct mailslot *)get_handle_obj( process, handle, access, &mailslot_ops );
 558 }
 559
 560
 561 /* create a mailslot */
 562 DECL_HANDLER(create_mailslot)
 563 {
 564     struct mailslot *mailslot;
 565     struct unicode_str name;
 566     struct object *root;
 567     const struct security_descriptor *sd;
 568     const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );
 569
 570     if (!objattr) return;
 571
 572     if (!name.len)  /* mailslots need a root directory even without a name */
 573     {
 574         if (!objattr->rootdir)
 575         {
 576             set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
 577             return;
 578         }
 579         if (!(root = get_directory_obj( current->process, objattr->rootdir ))) return;
 580     }
 581
 582     if ((mailslot = create_mailslot( root, &name, objattr->attributes, req->max_msgsize,
 583                                      req->read_timeout, sd )))
 584     {
 585         reply->handle = alloc_handle( current->process, mailslot, req->access, objattr->attributes );
 586         release_object( mailslot );
 587     }
 588
 589     if (root) release_object( root );
 590 }
 591
 592
 593 /* set mailslot information */
 594 DECL_HANDLER(set_mailslot_info)
 595 {
 596     struct mailslot *mailslot = get_mailslot_obj( current->process, req->handle, 0 );
 597
 598     if (mailslot)
 599     {
 600         if (req->flags & MAILSLOT_SET_READ_TIMEOUT)
 601             mailslot->read_timeout = req->read_timeout;
 602         reply->max_msgsize = mailslot->max_msgsize;
 603         reply->read_timeout = mailslot->read_timeout;
 604         release_object( mailslot );
 605     }
 606 }