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