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Sweden-Number/server/mailslot.c

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/*
* Server-side mailslot management
*
* Copyright (C) 1998 Alexandre Julliard
* Copyright (C) 2005 Mike McCormack
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
*/
#include "config.h"
#include "wine/port.h"
#include "ntstatus.h"
#define WIN32_NO_STATUS
#include "wine/unicode.h"
#include <assert.h>
#include <fcntl.h>
#include <string.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_SYS_FILIO_H
#include <sys/filio.h>
#endif
#include "windef.h"
#include "winternl.h"
#include "file.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
struct mailslot
{
struct object obj;
struct fd *fd;
int write_fd;
unsigned int max_msgsize;
timeout_t read_timeout;
struct list writers;
};
/* mailslot functions */
static void mailslot_dump( struct object*, int );
static struct fd *mailslot_get_fd( struct object * );
static unsigned int mailslot_map_access( struct object *obj, unsigned int access );
static struct object *mailslot_open_file( struct object *obj, unsigned int access,
unsigned int sharing, unsigned int options );
static void mailslot_destroy( struct object * );
static const struct object_ops mailslot_ops =
{
sizeof(struct mailslot), /* size */
mailslot_dump, /* dump */
no_get_type, /* get_type */
add_queue, /* add_queue */
remove_queue, /* remove_queue */
default_fd_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
mailslot_get_fd, /* get_fd */
mailslot_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
mailslot_open_file, /* open_file */
fd_close_handle, /* close_handle */
mailslot_destroy /* destroy */
};
static enum server_fd_type mailslot_get_fd_type( struct fd *fd );
static void mailslot_queue_async( struct fd *fd, const async_data_t *data, int type, int count );
static const struct fd_ops mailslot_fd_ops =
{
default_fd_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
mailslot_get_fd_type, /* get_fd_type */
no_fd_read, /* read */
no_fd_write, /* write */
no_fd_flush, /* flush */
default_fd_ioctl, /* ioctl */
mailslot_queue_async, /* queue_async */
default_fd_reselect_async, /* reselect_async */
default_fd_cancel_async /* cancel_async */
};
struct mail_writer
{
struct object obj;
struct fd *fd;
struct mailslot *mailslot;
struct list entry;
unsigned int access;
unsigned int sharing;
};
static void mail_writer_dump( struct object *obj, int verbose );
static struct fd *mail_writer_get_fd( struct object *obj );
static unsigned int mail_writer_map_access( struct object *obj, unsigned int access );
static void mail_writer_destroy( struct object *obj);
static const struct object_ops mail_writer_ops =
{
sizeof(struct mail_writer), /* size */
mail_writer_dump, /* dump */
no_get_type, /* get_type */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
no_signal, /* signal */
mail_writer_get_fd, /* get_fd */
mail_writer_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
no_lookup_name, /* lookup_name */
no_open_file, /* open_file */
fd_close_handle, /* close_handle */
mail_writer_destroy /* destroy */
};
static enum server_fd_type mail_writer_get_fd_type( struct fd *fd );
static const struct fd_ops mail_writer_fd_ops =
{
default_fd_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
mail_writer_get_fd_type, /* get_fd_type */
no_fd_read, /* read */
no_fd_write, /* write */
no_fd_flush, /* flush */
default_fd_ioctl, /* ioctl */
default_fd_queue_async, /* queue_async */
default_fd_reselect_async, /* reselect_async */
default_fd_cancel_async /* cancel_async */
};
struct mailslot_device
{
struct object obj; /* object header */
struct fd *fd; /* pseudo-fd for ioctls */
struct namespace *mailslots; /* mailslot namespace */
};
static void mailslot_device_dump( struct object *obj, int verbose );
static struct object_type *mailslot_device_get_type( struct object *obj );
static struct fd *mailslot_device_get_fd( struct object *obj );
static struct object *mailslot_device_lookup_name( struct object *obj, struct unicode_str *name,
unsigned int attr );
static struct object *mailslot_device_open_file( struct object *obj, unsigned int access,
unsigned int sharing, unsigned int options );
static void mailslot_device_destroy( struct object *obj );
static enum server_fd_type mailslot_device_get_fd_type( struct fd *fd );
static const struct object_ops mailslot_device_ops =
{
sizeof(struct mailslot_device), /* size */
mailslot_device_dump, /* dump */
mailslot_device_get_type, /* get_type */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
mailslot_device_get_fd, /* get_fd */
no_map_access, /* map_access */
default_get_sd, /* get_sd */
default_set_sd, /* set_sd */
mailslot_device_lookup_name, /* lookup_name */
mailslot_device_open_file, /* open_file */
fd_close_handle, /* close_handle */
mailslot_device_destroy /* destroy */
};
static const struct fd_ops mailslot_device_fd_ops =
{
default_fd_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
mailslot_device_get_fd_type, /* get_fd_type */
no_fd_read, /* read */
no_fd_write, /* write */
no_fd_flush, /* flush */
default_fd_ioctl, /* ioctl */
default_fd_queue_async, /* queue_async */
default_fd_reselect_async, /* reselect_async */
default_fd_cancel_async /* cancel_async */
};
static void mailslot_destroy( struct object *obj)
{
struct mailslot *mailslot = (struct mailslot *) obj;
assert( mailslot->fd );
if (mailslot->write_fd != -1)
{
shutdown( mailslot->write_fd, SHUT_RDWR );
close( mailslot->write_fd );
}
release_object( mailslot->fd );
}
static void mailslot_dump( struct object *obj, int verbose )
{
struct mailslot *mailslot = (struct mailslot *) obj;
assert( obj->ops == &mailslot_ops );
fprintf( stderr, "Mailslot max_msgsize=%d read_timeout=%s\n",
mailslot->max_msgsize, get_timeout_str(mailslot->read_timeout) );
}
static enum server_fd_type mailslot_get_fd_type( struct fd *fd )
{
return FD_TYPE_MAILSLOT;
}
static struct fd *mailslot_get_fd( struct object *obj )
{
struct mailslot *mailslot = (struct mailslot *) obj;
return (struct fd *)grab_object( mailslot->fd );
}
static unsigned int mailslot_map_access( struct object *obj, unsigned int access )
{
/* mailslots can only be read */
if (access & GENERIC_READ) access |= FILE_GENERIC_READ;
if (access & GENERIC_ALL) access |= FILE_GENERIC_READ;
return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
}
static struct object *mailslot_open_file( struct object *obj, unsigned int access,
unsigned int sharing, unsigned int options )
{
struct mailslot *mailslot = (struct mailslot *)obj;
struct mail_writer *writer;
int unix_fd;
if (!(sharing & FILE_SHARE_READ))
{
set_error( STATUS_SHARING_VIOLATION );
return NULL;
}
if (!list_empty( &mailslot->writers ))
{
/* Readers and writers cannot be mixed.
* If there's more than one writer, all writers must open with FILE_SHARE_WRITE
*/
writer = LIST_ENTRY( list_head(&mailslot->writers), struct mail_writer, entry );
if (((access & (GENERIC_WRITE|FILE_WRITE_DATA)) || (writer->access & FILE_WRITE_DATA)) &&
!((sharing & FILE_SHARE_WRITE) && (writer->sharing & FILE_SHARE_WRITE)))
{
set_error( STATUS_SHARING_VIOLATION );
return NULL;
}
}
if ((unix_fd = dup( mailslot->write_fd )) == -1)
{
file_set_error();
return NULL;
}
if (!(writer = alloc_object( &mail_writer_ops )))
{
close( unix_fd );
return NULL;
}
grab_object( mailslot );
writer->mailslot = mailslot;
writer->access = mail_writer_map_access( &writer->obj, access );
writer->sharing = sharing;
list_add_head( &mailslot->writers, &writer->entry );
if (!(writer->fd = create_anonymous_fd( &mail_writer_fd_ops, unix_fd, &writer->obj, options )))
{
release_object( writer );
return NULL;
}
allow_fd_caching( writer->fd );
return &writer->obj;
}
static void mailslot_queue_async( struct fd *fd, const async_data_t *data, int type, int count )
{
struct mailslot *mailslot = get_fd_user( fd );
struct async *async;
assert(mailslot->obj.ops == &mailslot_ops);
if ((async = fd_queue_async( fd, data, type )))
{
async_set_timeout( async, mailslot->read_timeout ? mailslot->read_timeout : -1,
STATUS_IO_TIMEOUT );
release_object( async );
set_error( STATUS_PENDING );
}
}
static void mailslot_device_dump( struct object *obj, int verbose )
{
fputs( "Mailslot device\n", stderr );
}
static struct object_type *mailslot_device_get_type( struct object *obj )
{
static const WCHAR name[] = {'D','e','v','i','c','e'};
static const struct unicode_str str = { name, sizeof(name) };
return get_object_type( &str );
}
static struct fd *mailslot_device_get_fd( struct object *obj )
{
struct mailslot_device *device = (struct mailslot_device *)obj;
return (struct fd *)grab_object( device->fd );
}
static struct object *mailslot_device_lookup_name( struct object *obj, struct unicode_str *name,
unsigned int attr )
{
struct mailslot_device *device = (struct mailslot_device*)obj;
struct object *found;
assert( obj->ops == &mailslot_device_ops );
if ((found = find_object( device->mailslots, name, attr | OBJ_CASE_INSENSITIVE )))
name->len = 0;
return found;
}
static struct object *mailslot_device_open_file( struct object *obj, unsigned int access,
unsigned int sharing, unsigned int options )
{
return grab_object( obj );
}
static void mailslot_device_destroy( struct object *obj )
{
struct mailslot_device *device = (struct mailslot_device*)obj;
assert( obj->ops == &mailslot_device_ops );
if (device->fd) release_object( device->fd );
free( device->mailslots );
}
static enum server_fd_type mailslot_device_get_fd_type( struct fd *fd )
{
return FD_TYPE_DEVICE;
}
void create_mailslot_device( struct directory *root, const struct unicode_str *name )
{
struct mailslot_device *dev;
if ((dev = create_named_object_dir( root, name, 0, &mailslot_device_ops )) &&
get_error() != STATUS_OBJECT_NAME_EXISTS)
{
dev->mailslots = NULL;
if (!(dev->fd = alloc_pseudo_fd( &mailslot_device_fd_ops, &dev->obj, 0 )) ||
!(dev->mailslots = create_namespace( 7 )))
{
release_object( dev );
dev = NULL;
}
}
if (dev) make_object_static( &dev->obj );
}
static struct mailslot *create_mailslot( struct directory *root,
const struct unicode_str *name, unsigned int attr,
int max_msgsize, timeout_t read_timeout,
const struct security_descriptor *sd )
{
struct object *obj;
struct unicode_str new_name;
struct mailslot_device *dev;
struct mailslot *mailslot;
int fds[2];
if (!name || !name->len)
{
mailslot = alloc_object( &mailslot_ops );
goto init;
}
if (!(obj = find_object_dir( root, name, attr, &new_name )))
{
set_error( STATUS_OBJECT_NAME_INVALID );
return NULL;
}
if (!new_name.len)
{
if (attr & OBJ_OPENIF && obj->ops == &mailslot_ops)
/* it already exists - there can only be one mailslot to read from */
set_error( STATUS_OBJECT_NAME_EXISTS );
else if (attr & OBJ_OPENIF)
set_error( STATUS_OBJECT_TYPE_MISMATCH );
else
set_error( STATUS_OBJECT_NAME_COLLISION );
release_object( obj );
return NULL;
}
if (obj->ops != &mailslot_device_ops)
{
set_error( STATUS_OBJECT_NAME_INVALID );
release_object( obj );
return NULL;
}
dev = (struct mailslot_device *)obj;
mailslot = create_object( dev->mailslots, &mailslot_ops, &new_name, NULL );
release_object( dev );
init:
if (!mailslot) return NULL;
mailslot->fd = NULL;
mailslot->write_fd = -1;
mailslot->max_msgsize = max_msgsize;
mailslot->read_timeout = read_timeout;
list_init( &mailslot->writers );
if (sd) default_set_sd( &mailslot->obj, sd, OWNER_SECURITY_INFORMATION | GROUP_SECURITY_INFORMATION |
DACL_SECURITY_INFORMATION | SACL_SECURITY_INFORMATION );
if (!socketpair( PF_UNIX, SOCK_DGRAM, 0, fds ))
{
fcntl( fds[0], F_SETFL, O_NONBLOCK );
fcntl( fds[1], F_SETFL, O_NONBLOCK );
shutdown( fds[0], SHUT_RD );
mailslot->write_fd = fds[0];
if ((mailslot->fd = create_anonymous_fd( &mailslot_fd_ops, fds[1], &mailslot->obj,
FILE_SYNCHRONOUS_IO_NONALERT )))
{
allow_fd_caching( mailslot->fd );
return mailslot;
}
}
else file_set_error();
release_object( mailslot );
return NULL;
}
static void mail_writer_dump( struct object *obj, int verbose )
{
fprintf( stderr, "Mailslot writer\n" );
}
static void mail_writer_destroy( struct object *obj)
{
struct mail_writer *writer = (struct mail_writer *) obj;
if (writer->fd) release_object( writer->fd );
list_remove( &writer->entry );
release_object( writer->mailslot );
}
static enum server_fd_type mail_writer_get_fd_type( struct fd *fd )
{
return FD_TYPE_MAILSLOT;
}
static struct fd *mail_writer_get_fd( struct object *obj )
{
struct mail_writer *writer = (struct mail_writer *) obj;
return (struct fd *)grab_object( writer->fd );
}
static unsigned int mail_writer_map_access( struct object *obj, unsigned int access )
{
/* mailslot writers can only get write access */
if (access & GENERIC_WRITE) access |= FILE_GENERIC_WRITE;
if (access & GENERIC_ALL) access |= FILE_GENERIC_WRITE;
return access & ~(GENERIC_READ | GENERIC_WRITE | GENERIC_EXECUTE | GENERIC_ALL);
}
static struct mailslot *get_mailslot_obj( struct process *process, obj_handle_t handle,
unsigned int access )
{
return (struct mailslot *)get_handle_obj( process, handle, access, &mailslot_ops );
}
/* create a mailslot */
DECL_HANDLER(create_mailslot)
{
struct mailslot *mailslot;
struct unicode_str name;
struct directory *root;
const struct security_descriptor *sd;
const struct object_attributes *objattr = get_req_object_attributes( &sd, &name, &root );
if (!objattr) return;
if (!name.len) /* mailslots need a root directory even without a name */
{
if (!objattr->rootdir)
{
set_error( STATUS_OBJECT_PATH_SYNTAX_BAD );
return;
}
else if (!(root = get_directory_obj( current->process, objattr->rootdir, 0 ))) return;
}
if ((mailslot = create_mailslot( root, &name, objattr->attributes, req->max_msgsize,
req->read_timeout, sd )))
{
reply->handle = alloc_handle( current->process, mailslot, req->access, objattr->attributes );
release_object( mailslot );
}
if (root) release_object( root );
}
/* set mailslot information */
DECL_HANDLER(set_mailslot_info)
{
struct mailslot *mailslot = get_mailslot_obj( current->process, req->handle, 0 );
if (mailslot)
{
if (req->flags & MAILSLOT_SET_READ_TIMEOUT)
mailslot->read_timeout = req->read_timeout;
reply->max_msgsize = mailslot->max_msgsize;
reply->read_timeout = mailslot->read_timeout;
release_object( mailslot );
}
}
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