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 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     no_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     no_lookup_name,            /* lookup_name */
  88     mailslot_open_file,        /* open_file */
  89     fd_close_handle,           /* close_handle */
  90     mailslot_destroy           /* destroy */
  91 };
  92
  93 static enum server_fd_type mailslot_get_fd_type( struct fd *fd );
  94 static void mailslot_queue_async( struct fd *fd, const async_data_t *data, int type, int count );
  95
  96 static const struct fd_ops mailslot_fd_ops =
  97 {
  98     default_fd_get_poll_events, /* get_poll_events */
  99     default_poll_event,         /* poll_event */
 100     mailslot_get_fd_type,       /* get_fd_type */
 101     no_fd_read,                 /* read */
 102     no_fd_write,                /* write */
 103     no_fd_flush,                /* flush */
 104     default_fd_ioctl,           /* ioctl */
 105     mailslot_queue_async,       /* queue_async */
 106     default_fd_reselect_async,  /* reselect_async */
 107     default_fd_cancel_async     /* cancel_async */
 108 };
 109
 110
 111 struct mail_writer
 112 {
 113     struct object         obj;
 114     struct fd            *fd;
 115     struct mailslot      *mailslot;
 116     struct list           entry;
 117     unsigned int          access;
 118     unsigned int          sharing;
 119 };
 120
 121 static void mail_writer_dump( struct object *obj, int verbose );
 122 static struct fd *mail_writer_get_fd( struct object *obj );
 123 static unsigned int mail_writer_map_access( struct object *obj, unsigned int access );
 124 static void mail_writer_destroy( struct object *obj);
 125
 126 static const struct object_ops mail_writer_ops =
 127 {
 128     sizeof(struct mail_writer), /* size */
 129     mail_writer_dump,           /* dump */
 130     no_get_type,                /* get_type */
 131     no_add_queue,               /* add_queue */
 132     NULL,                       /* remove_queue */
 133     NULL,                       /* signaled */
 134     NULL,                       /* satisfied */
 135     no_signal,                  /* signal */
 136     mail_writer_get_fd,         /* get_fd */
 137     mail_writer_map_access,     /* map_access */
 138     default_get_sd,             /* get_sd */
 139     default_set_sd,             /* set_sd */
 140     no_lookup_name,             /* lookup_name */
 141     no_open_file,               /* open_file */
 142     fd_close_handle,            /* close_handle */
 143     mail_writer_destroy         /* destroy */
 144 };
 145
 146 static enum server_fd_type mail_writer_get_fd_type( struct fd *fd );
 147
 148 static const struct fd_ops mail_writer_fd_ops =
 149 {
 150     default_fd_get_poll_events,  /* get_poll_events */
 151     default_poll_event,          /* poll_event */
 152     mail_writer_get_fd_type,     /* get_fd_type */
 153     no_fd_read,                  /* read */
 154     no_fd_write,                 /* write */
 155     no_fd_flush,                 /* flush */
 156     default_fd_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 struct mailslot_device
 164 {
 165     struct object       obj;         /* object header */
 166     struct fd          *fd;          /* pseudo-fd for ioctls */
 167     struct namespace   *mailslots;   /* mailslot namespace */
 168 };
 169
 170 static void mailslot_device_dump( struct object *obj, int verbose );
 171 static struct object_type *mailslot_device_get_type( struct object *obj );
 172 static struct fd *mailslot_device_get_fd( struct object *obj );
 173 static struct object *mailslot_device_lookup_name( struct object *obj, struct unicode_str *name,
 174                                                    unsigned int attr );
 175 static struct object *mailslot_device_open_file( struct object *obj, unsigned int access,
 176                                                  unsigned int sharing, unsigned int options );
 177 static void mailslot_device_destroy( struct object *obj );
 178 static enum server_fd_type mailslot_device_get_fd_type( struct fd *fd );
 179
 180 static const struct object_ops mailslot_device_ops =
 181 {
 182     sizeof(struct mailslot_device), /* size */
 183     mailslot_device_dump,           /* dump */
 184     mailslot_device_get_type,       /* get_type */
 185     no_add_queue,                   /* add_queue */
 186     NULL,                           /* remove_queue */
 187     NULL,                           /* signaled */
 188     no_satisfied,                   /* satisfied */
 189     no_signal,                      /* signal */
 190     mailslot_device_get_fd,         /* get_fd */
 191     no_map_access,                  /* map_access */
 192     default_get_sd,                 /* get_sd */
 193     default_set_sd,                 /* set_sd */
 194     mailslot_device_lookup_name,    /* lookup_name */
 195     mailslot_device_open_file,      /* open_file */
 196     fd_close_handle,                /* close_handle */
 197     mailslot_device_destroy         /* destroy */
 198 };
 199
 200 static const struct fd_ops mailslot_device_fd_ops =
 201 {
 202     default_fd_get_poll_events,     /* get_poll_events */
 203     default_poll_event,             /* poll_event */
 204     mailslot_device_get_fd_type,    /* get_fd_type */
 205     no_fd_read,                     /* read */
 206     no_fd_write,                    /* write */
 207     no_fd_flush,                    /* flush */
 208     default_fd_ioctl,               /* ioctl */
 209     default_fd_queue_async,         /* queue_async */
 210     default_fd_reselect_async,      /* reselect_async */
 211     default_fd_cancel_async         /* cancel_async */
 212 };
 213
 214 static void mailslot_destroy( struct object *obj)
 215 {
 216     struct mailslot *mailslot = (struct mailslot *) obj;
 217
 218     assert( mailslot->fd );
 219
 220     if (mailslot->write_fd != -1)
 221     {
 222         shutdown( mailslot->write_fd, SHUT_RDWR );
 223         close( mailslot->write_fd );
 224     }
 225     release_object( mailslot->fd );
 226 }
 227
 228 static void mailslot_dump( struct object *obj, int verbose )
 229 {
 230     struct mailslot *mailslot = (struct mailslot *) obj;
 231
 232     assert( obj->ops == &mailslot_ops );
 233     fprintf( stderr, "Mailslot max_msgsize=%d read_timeout=%s\n",
 234              mailslot->max_msgsize, get_timeout_str(mailslot->read_timeout) );
 235 }
 236
 237 static enum server_fd_type mailslot_get_fd_type( struct fd *fd )
 238 {
 239     return FD_TYPE_MAILSLOT;
 240 }
 241
 242 static struct fd *mailslot_get_fd( struct object *obj )
 243 {
 244     struct mailslot *mailslot = (struct mailslot *) obj;
 245
 246     return (struct fd *)grab_object( mailslot->fd );
 247 }
 248
 249 static unsigned int mailslot_map_access( struct object *obj, unsigned int access )
 250 {
 251     /* mailslots can only be read */
 252     if (access & GENERIC_READ)    access |= FILE_GENERIC_READ;
 253     if (access & GENERIC_ALL)     access |= FILE_GENERIC_READ;
 254     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 255 }
 256
 257 static struct object *mailslot_open_file( struct object *obj, unsigned int access,
 258                                           unsigned int sharing, unsigned int options )
 259 {
 260     struct mailslot *mailslot = (struct mailslot *)obj;
 261     struct mail_writer *writer;
 262     int unix_fd;
 263
 264     if (!(sharing & FILE_SHARE_READ))
 265     {
 266         set_error( STATUS_SHARING_VIOLATION );
 267         return NULL;
 268     }
 269
 270     if (!list_empty( &mailslot->writers ))
 271     {
 272         /* Readers and writers cannot be mixed.
 273          * If there's more than one writer, all writers must open with FILE_SHARE_WRITE
 274          */
 275         writer = LIST_ENTRY( list_head(&mailslot->writers), struct mail_writer, entry );
 276
 277         if (((access & (GENERIC_WRITE|FILE_WRITE_DATA)) || (writer->access & FILE_WRITE_DATA)) &&
 278            !((sharing & FILE_SHARE_WRITE) && (writer->sharing & FILE_SHARE_WRITE)))
 279         {
 280             set_error( STATUS_SHARING_VIOLATION );
 281             return NULL;
 282         }
 283     }
 284
 285     if ((unix_fd = dup( mailslot->write_fd )) == -1)
 286     {
 287         file_set_error();
 288         return NULL;
 289     }
 290     if (!(writer = alloc_object( &mail_writer_ops )))
 291     {
 292         close( unix_fd );
 293         return NULL;
 294     }
 295     grab_object( mailslot );
 296     writer->mailslot = mailslot;
 297     writer->access   = mail_writer_map_access( &writer->obj, access );
 298     writer->sharing  = sharing;
 299     list_add_head( &mailslot->writers, &writer->entry );
 300
 301     if (!(writer->fd = create_anonymous_fd( &mail_writer_fd_ops, unix_fd, &writer->obj, options )))
 302     {
 303         release_object( writer );
 304         return NULL;
 305     }
 306     allow_fd_caching( writer->fd );
 307     return &writer->obj;
 308 }
 309
 310 static void mailslot_queue_async( struct fd *fd, const async_data_t *data, int type, int count )
 311 {
 312     struct mailslot *mailslot = get_fd_user( fd );
 313     struct async *async;
 314
 315     assert(mailslot->obj.ops == &mailslot_ops);
 316
 317     if ((async = fd_queue_async( fd, data, type )))
 318     {
 319         async_set_timeout( async, mailslot->read_timeout ? mailslot->read_timeout : -1,
 320                            STATUS_IO_TIMEOUT );
 321         release_object( async );
 322         set_error( STATUS_PENDING );
 323     }
 324 }
 325
 326 static void mailslot_device_dump( struct object *obj, int verbose )
 327 {
 328     assert( obj->ops == &mailslot_device_ops );
 329     fprintf( stderr, "Mail slot device\n" );
 330 }
 331
 332 static struct object_type *mailslot_device_get_type( struct object *obj )
 333 {
 334     static const WCHAR name[] = {'D','e','v','i','c','e'};
 335     static const struct unicode_str str = { name, sizeof(name) };
 336     return get_object_type( &str );
 337 }
 338
 339 static struct fd *mailslot_device_get_fd( struct object *obj )
 340 {
 341     struct mailslot_device *device = (struct mailslot_device *)obj;
 342     return (struct fd *)grab_object( device->fd );
 343 }
 344
 345 static struct object *mailslot_device_lookup_name( struct object *obj, struct unicode_str *name,
 346                                                    unsigned int attr )
 347 {
 348     struct mailslot_device *device = (struct mailslot_device*)obj;
 349     struct object *found;
 350
 351     assert( obj->ops == &mailslot_device_ops );
 352
 353     if ((found = find_object( device->mailslots, name, attr | OBJ_CASE_INSENSITIVE )))
 354         name->len = 0;
 355
 356     return found;
 357 }
 358
 359 static struct object *mailslot_device_open_file( struct object *obj, unsigned int access,
 360                                                  unsigned int sharing, unsigned int options )
 361 {
 362     return grab_object( obj );
 363 }
 364
 365 static void mailslot_device_destroy( struct object *obj )
 366 {
 367     struct mailslot_device *device = (struct mailslot_device*)obj;
 368     assert( obj->ops == &mailslot_device_ops );
 369     if (device->fd) release_object( device->fd );
 370     free( device->mailslots );
 371 }
 372
 373 static enum server_fd_type mailslot_device_get_fd_type( struct fd *fd )
 374 {
 375     return FD_TYPE_DEVICE;
 376 }
 377
 378 void create_mailslot_device( struct directory *root, const struct unicode_str *name )
 379 {
 380     struct mailslot_device *dev;
 381
 382     if ((dev = create_named_object_dir( root, name, 0, &mailslot_device_ops )) &&
 383         get_error() != STATUS_OBJECT_NAME_EXISTS)
 384     {
 385         dev->mailslots = NULL;
 386         if (!(dev->fd = alloc_pseudo_fd( &mailslot_device_fd_ops, &dev->obj, 0 )) ||
 387             !(dev->mailslots = create_namespace( 7 )))
 388         {
 389             release_object( dev );
 390             dev = NULL;
 391         }
 392     }
 393     if (dev) make_object_static( &dev->obj );
 394 }
 395
 396 static struct mailslot *create_mailslot( struct directory *root,
 397                                          const struct unicode_str *name, unsigned int attr,
 398                                          int max_msgsize, timeout_t read_timeout )
 399 {
 400     struct object *obj;
 401     struct unicode_str new_name;
 402     struct mailslot_device *dev;
 403     struct mailslot *mailslot;
 404     int fds[2];
 405
 406     if (!name || !name->len) return alloc_object( &mailslot_ops );
 407
 408     if (!(obj = find_object_dir( root, name, attr, &new_name )))
 409     {
 410         set_error( STATUS_OBJECT_NAME_INVALID );
 411         return NULL;
 412     }
 413
 414     if (!new_name.len)
 415     {
 416         if (attr & OBJ_OPENIF && obj->ops == &mailslot_ops)
 417             /* it already exists - there can only be one mailslot to read from */
 418             set_error( STATUS_OBJECT_NAME_EXISTS );
 419         else if (attr & OBJ_OPENIF)
 420             set_error( STATUS_OBJECT_TYPE_MISMATCH );
 421         else
 422             set_error( STATUS_OBJECT_NAME_COLLISION );
 423         release_object( obj );
 424         return NULL;
 425     }
 426
 427     if (obj->ops != &mailslot_device_ops)
 428     {
 429         set_error( STATUS_OBJECT_NAME_INVALID );
 430         release_object( obj );
 431         return NULL;
 432     }
 433
 434     dev = (struct mailslot_device *)obj;
 435     mailslot = create_object( dev->mailslots, &mailslot_ops, &new_name, NULL );
 436     release_object( dev );
 437
 438     if (!mailslot) return NULL;
 439
 440     mailslot->fd = NULL;
 441     mailslot->write_fd = -1;
 442     mailslot->max_msgsize = max_msgsize;
 443     mailslot->read_timeout = read_timeout;
 444     list_init( &mailslot->writers );
 445
 446     if (!socketpair( PF_UNIX, SOCK_DGRAM, 0, fds ))
 447     {
 448         fcntl( fds[0], F_SETFL, O_NONBLOCK );
 449         fcntl( fds[1], F_SETFL, O_NONBLOCK );
 450         shutdown( fds[0], SHUT_RD );
 451         mailslot->write_fd = fds[0];
 452         if ((mailslot->fd = create_anonymous_fd( &mailslot_fd_ops, fds[1], &mailslot->obj,
 453                                                  FILE_SYNCHRONOUS_IO_NONALERT )))
 454         {
 455             allow_fd_caching( mailslot->fd );
 456             return mailslot;
 457         }
 458     }
 459     else file_set_error();
 460
 461     release_object( mailslot );
 462     return NULL;
 463 }
 464
 465 static void mail_writer_dump( struct object *obj, int verbose )
 466 {
 467     fprintf( stderr, "Mailslot writer\n" );
 468 }
 469
 470 static void mail_writer_destroy( struct object *obj)
 471 {
 472     struct mail_writer *writer = (struct mail_writer *) obj;
 473
 474     if (writer->fd) release_object( writer->fd );
 475     list_remove( &writer->entry );
 476     release_object( writer->mailslot );
 477 }
 478
 479 static enum server_fd_type mail_writer_get_fd_type( struct fd *fd )
 480 {
 481     return FD_TYPE_MAILSLOT;
 482 }
 483
 484 static struct fd *mail_writer_get_fd( struct object *obj )
 485 {
 486     struct mail_writer *writer = (struct mail_writer *) obj;
 487     return (struct fd *)grab_object( writer->fd );
 488 }
 489
 490 static unsigned int mail_writer_map_access( struct object *obj, unsigned int access )
 491 {
 492     /* mailslot writers can only get write access */
 493     if (access & GENERIC_WRITE)   access |= FILE_GENERIC_WRITE;
 494     if (access & GENERIC_ALL)     access |= FILE_GENERIC_WRITE;
 495     return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
 496 }
 497
 498 static struct mailslot *get_mailslot_obj( struct process *process, obj_handle_t handle,
 499                                           unsigned int access )
 500 {
 501     return (struct mailslot *)get_handle_obj( process, handle, access, &mailslot_ops );
 502 }
 503
 504
 505 /* create a mailslot */
 506 DECL_HANDLER(create_mailslot)
 507 {
 508     struct mailslot *mailslot;
 509     struct unicode_str name;
 510     struct directory *root = NULL;
 511
 512     reply->handle = 0;
 513     get_req_unicode_str( &name );
 514     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 515         return;
 516
 517     if ((mailslot = create_mailslot( root, &name, req->attributes, req->max_msgsize,
 518                                      req->read_timeout )))
 519     {
 520         reply->handle = alloc_handle( current->process, mailslot, req->access, req->attributes );
 521         release_object( mailslot );
 522     }
 523
 524     if (root) release_object( root );
 525 }
 526
 527
 528 /* set mailslot information */
 529 DECL_HANDLER(set_mailslot_info)
 530 {
 531     struct mailslot *mailslot = get_mailslot_obj( current->process, req->handle, 0 );
 532
 533     if (mailslot)
 534     {
 535         if (req->flags & MAILSLOT_SET_READ_TIMEOUT)
 536             mailslot->read_timeout = req->read_timeout;
 537         reply->max_msgsize = mailslot->max_msgsize;
 538         reply->read_timeout = mailslot->read_timeout;
 539         release_object( mailslot );
 540     }
 541 }