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