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Sweden-Number/server/named_pipe.c

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/*
* Server-side pipe management
*
* Copyright (C) 1998 Alexandre Julliard
* Copyright (C) 2001 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* TODO:
* message mode
*/
#include "config.h"
#include "wine/port.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_SOCKET_H
#include <sys/socket.h>
#endif
#include <time.h>
#include <unistd.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#endif
#include "windef.h"
#include "winternl.h"
#include "file.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
enum pipe_state
{
ps_idle_server,
ps_wait_open,
ps_connected_server,
ps_wait_disconnect,
ps_disconnected_server,
ps_wait_connect
};
struct named_pipe;
struct pipe_server
{
struct object obj; /* object header */
struct fd *fd; /* pipe file descriptor */
struct list entry; /* entry in named pipe servers list */
enum pipe_state state; /* server state */
struct pipe_client *client; /* client that this server is connected to */
struct named_pipe *pipe;
struct timeout_user *flush_poll;
struct event *event;
struct list wait_q; /* only a single one can be queued */
unsigned int options; /* pipe options */
};
struct pipe_client
{
struct object obj; /* object header */
struct fd *fd; /* pipe file descriptor */
struct pipe_server *server; /* server that this client is connected to */
unsigned int flags; /* file flags */
};
struct named_pipe
{
struct object obj; /* object header */
unsigned int flags;
unsigned int maxinstances;
unsigned int outsize;
unsigned int insize;
unsigned int timeout;
unsigned int instances;
struct list servers; /* list of servers using this pipe */
struct list waiters; /* list of clients waiting to connect */
};
static void named_pipe_dump( struct object *obj, int verbose );
static void named_pipe_destroy( struct object *obj );
static const struct object_ops named_pipe_ops =
{
sizeof(struct named_pipe), /* size */
named_pipe_dump, /* dump */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
no_signal, /* signal */
no_get_fd, /* get_fd */
no_close_handle, /* close_handle */
named_pipe_destroy /* destroy */
};
/* server end functions */
static void pipe_server_dump( struct object *obj, int verbose );
static struct fd *pipe_server_get_fd( struct object *obj );
static void pipe_server_destroy( struct object *obj);
static int pipe_server_flush( struct fd *fd, struct event **event );
static int pipe_server_get_info( struct fd *fd );
static const struct object_ops pipe_server_ops =
{
sizeof(struct pipe_server), /* size */
pipe_server_dump, /* dump */
default_fd_add_queue, /* add_queue */
default_fd_remove_queue, /* remove_queue */
default_fd_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
pipe_server_get_fd, /* get_fd */
no_close_handle, /* close_handle */
pipe_server_destroy /* destroy */
};
static const struct fd_ops pipe_server_fd_ops =
{
default_fd_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
pipe_server_flush, /* flush */
pipe_server_get_info, /* get_file_info */
default_fd_queue_async, /* queue_async */
default_fd_cancel_async, /* cancel_async */
};
/* client end functions */
static void pipe_client_dump( struct object *obj, int verbose );
static struct fd *pipe_client_get_fd( struct object *obj );
static void pipe_client_destroy( struct object *obj );
static int pipe_client_flush( struct fd *fd, struct event **event );
static int pipe_client_get_info( struct fd *fd );
static const struct object_ops pipe_client_ops =
{
sizeof(struct pipe_client), /* size */
pipe_client_dump, /* dump */
default_fd_add_queue, /* add_queue */
default_fd_remove_queue, /* remove_queue */
default_fd_signaled, /* signaled */
no_satisfied, /* satisfied */
no_signal, /* signal */
pipe_client_get_fd, /* get_fd */
no_close_handle, /* close_handle */
pipe_client_destroy /* destroy */
};
static const struct fd_ops pipe_client_fd_ops =
{
default_fd_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
pipe_client_flush, /* flush */
pipe_client_get_info, /* get_file_info */
default_fd_queue_async, /* queue_async */
default_fd_cancel_async /* cancel_async */
};
static void named_pipe_dump( struct object *obj, int verbose )
{
struct named_pipe *pipe = (struct named_pipe *) obj;
assert( obj->ops == &named_pipe_ops );
fprintf( stderr, "Named pipe " );
dump_object_name( &pipe->obj );
fprintf( stderr, "\n" );
}
static void pipe_server_dump( struct object *obj, int verbose )
{
struct pipe_server *server = (struct pipe_server *) obj;
assert( obj->ops == &pipe_server_ops );
fprintf( stderr, "Named pipe server pipe=%p state=%d\n", server->pipe, server->state );
}
static void pipe_client_dump( struct object *obj, int verbose )
{
struct pipe_client *client = (struct pipe_client *) obj;
assert( obj->ops == &pipe_client_ops );
fprintf( stderr, "Named pipe client server=%p\n", client->server );
}
static void named_pipe_destroy( struct object *obj)
{
struct named_pipe *pipe = (struct named_pipe *) obj;
assert( list_empty( &pipe->servers ) );
assert( !pipe->instances );
async_terminate_queue( &pipe->waiters, STATUS_HANDLES_CLOSED );
}
static struct fd *pipe_client_get_fd( struct object *obj )
{
struct pipe_client *client = (struct pipe_client *) obj;
if (client->fd)
return (struct fd *) grab_object( client->fd );
set_error( STATUS_PIPE_DISCONNECTED );
return NULL;
}
static struct fd *pipe_server_get_fd( struct object *obj )
{
struct pipe_server *server = (struct pipe_server *) obj;
switch(server->state)
{
case ps_connected_server:
case ps_wait_disconnect:
assert( server->fd );
return (struct fd *) grab_object( server->fd );
case ps_wait_open:
case ps_idle_server:
set_error( STATUS_PIPE_LISTENING );
break;
case ps_disconnected_server:
case ps_wait_connect:
set_error( STATUS_PIPE_DISCONNECTED );
break;
}
return NULL;
}
static void notify_empty( struct pipe_server *server )
{
if (!server->flush_poll)
return;
assert( server->state == ps_connected_server );
assert( server->event );
remove_timeout_user( server->flush_poll );
server->flush_poll = NULL;
set_event( server->event );
release_object( server->event );
server->event = NULL;
}
static void do_disconnect( struct pipe_server *server )
{
/* we may only have a server fd, if the client disconnected */
if (server->client)
{
assert( server->client->server == server );
assert( server->client->fd );
release_object( server->client->fd );
server->client->fd = NULL;
}
assert( server->fd );
release_object( server->fd );
server->fd = NULL;
}
static void pipe_server_destroy( struct object *obj)
{
struct pipe_server *server = (struct pipe_server *)obj;
assert( obj->ops == &pipe_server_ops );
if (server->fd)
{
notify_empty( server );
do_disconnect( server );
}
if (server->client)
{
server->client->server = NULL;
server->client = NULL;
}
async_terminate_head( &server->wait_q, STATUS_HANDLES_CLOSED );
assert( server->pipe->instances );
server->pipe->instances--;
list_remove( &server->entry );
release_object( server->pipe );
}
static void pipe_client_destroy( struct object *obj)
{
struct pipe_client *client = (struct pipe_client *)obj;
struct pipe_server *server = client->server;
assert( obj->ops == &pipe_client_ops );
if (server)
{
notify_empty( server );
switch(server->state)
{
case ps_connected_server:
/* Don't destroy the server's fd here as we can't
do a successful flush without it. */
server->state = ps_wait_disconnect;
release_object( client->fd );
client->fd = NULL;
break;
case ps_disconnected_server:
server->state = ps_wait_connect;
break;
case ps_idle_server:
case ps_wait_open:
case ps_wait_disconnect:
case ps_wait_connect:
assert( 0 );
}
assert( server->client );
server->client = NULL;
client->server = NULL;
}
assert( !client->fd );
}
static int pipe_data_remaining( struct pipe_server *server )
{
struct pollfd pfd;
int fd;
assert( server->client );
fd = get_unix_fd( server->client->fd );
if (fd < 0)
return 0;
pfd.fd = fd;
pfd.events = POLLIN;
pfd.revents = 0;
if (0 > poll( &pfd, 1, 0 ))
return 0;
return pfd.revents&POLLIN;
}
static void check_flushed( void *arg )
{
struct pipe_server *server = (struct pipe_server*) arg;
assert( server->event );
if (pipe_data_remaining( server ))
{
struct timeval tv;
gettimeofday( &tv, NULL );
add_timeout( &tv, 100 );
server->flush_poll = add_timeout_user( &tv, check_flushed, server );
}
else
{
/* notify_empty( server ); */
server->flush_poll = NULL;
set_event( server->event );
release_object( server->event );
server->event = NULL;
}
}
static int pipe_server_flush( struct fd *fd, struct event **event )
{
struct pipe_server *server = get_fd_user( fd );
if (!server)
return 0;
if (server->state != ps_connected_server)
return 0;
/* FIXME: if multiple threads flush the same pipe,
maybe should create a list of processes to notify */
if (server->flush_poll)
return 0;
if (pipe_data_remaining( server ))
{
struct timeval tv;
/* this kind of sux -
there's no unix way to be alerted when a pipe becomes empty */
server->event = create_event( NULL, 0, 0, 0 );
if (!server->event)
return 0;
gettimeofday( &tv, NULL );
add_timeout( &tv, 100 );
server->flush_poll = add_timeout_user( &tv, check_flushed, server );
*event = server->event;
}
return 0;
}
static int pipe_client_flush( struct fd *fd, struct event **event )
{
/* FIXME: what do we have to do for this? */
return 0;
}
static inline int is_overlapped( unsigned int options )
{
return !(options & (FILE_SYNCHRONOUS_IO_ALERT | FILE_SYNCHRONOUS_IO_NONALERT));
}
static int pipe_server_get_info( struct fd *fd )
{
struct pipe_server *server = get_fd_user( fd );
int flags = FD_FLAG_AVAILABLE;
if (is_overlapped( server->options )) flags |= FD_FLAG_OVERLAPPED;
return flags;
}
static int pipe_client_get_info( struct fd *fd )
{
struct pipe_client *client = get_fd_user( fd );
int flags = FD_FLAG_AVAILABLE;
if (is_overlapped( client->flags )) flags |= FD_FLAG_OVERLAPPED;
return flags;
}
static struct named_pipe *create_named_pipe( const WCHAR *name, size_t len )
{
struct named_pipe *pipe;
pipe = create_named_object( sync_namespace, &named_pipe_ops, name, len );
if (pipe)
{
if (get_error() != STATUS_OBJECT_NAME_COLLISION)
{
/* initialize it if it didn't already exist */
pipe->instances = 0;
list_init( &pipe->servers );
list_init( &pipe->waiters );
}
}
return pipe;
}
static struct named_pipe *open_named_pipe( const WCHAR *name, size_t len )
{
struct object *obj;
if ((obj = find_object( sync_namespace, name, len )))
{
if (obj->ops == &named_pipe_ops) return (struct named_pipe *)obj;
release_object( obj );
set_error( STATUS_OBJECT_TYPE_MISMATCH );
}
else set_error( STATUS_OBJECT_NAME_NOT_FOUND );
return NULL;
}
static struct pipe_server *get_pipe_server_obj( struct process *process,
obj_handle_t handle, unsigned int access )
{
struct object *obj;
obj = get_handle_obj( process, handle, access, &pipe_server_ops );
return (struct pipe_server *) obj;
}
static struct pipe_server *create_pipe_server( struct named_pipe *pipe, unsigned int options )
{
struct pipe_server *server;
server = alloc_object( &pipe_server_ops );
if (!server)
return NULL;
server->fd = NULL;
server->pipe = pipe;
server->state = ps_idle_server;
server->client = NULL;
server->flush_poll = NULL;
server->options = options;
list_init( &server->wait_q );
list_add_head( &pipe->servers, &server->entry );
grab_object( pipe );
return server;
}
static struct pipe_client *create_pipe_client( struct pipe_server *server, unsigned int flags )
{
struct pipe_client *client;
client = alloc_object( &pipe_client_ops );
if (!client)
return NULL;
client->fd = NULL;
client->server = server;
client->flags = flags;
return client;
}
static inline struct pipe_server *find_server( struct named_pipe *pipe, enum pipe_state state )
{
struct pipe_server *server;
LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry )
{
if (server->state == state) return (struct pipe_server *)grab_object( server );
}
return NULL;
}
static inline struct pipe_server *find_server2( struct named_pipe *pipe,
enum pipe_state state1, enum pipe_state state2 )
{
struct pipe_server *server;
LIST_FOR_EACH_ENTRY( server, &pipe->servers, struct pipe_server, entry )
{
if (server->state == state1 || server->state == state2)
return (struct pipe_server *)grab_object( server );
}
return NULL;
}
DECL_HANDLER(create_named_pipe)
{
struct named_pipe *pipe;
struct pipe_server *server;
reply->handle = 0;
pipe = create_named_pipe( get_req_data(), get_req_data_size() );
if (!pipe)
return;
if (get_error() != STATUS_OBJECT_NAME_COLLISION)
{
pipe->insize = req->insize;
pipe->outsize = req->outsize;
pipe->maxinstances = req->maxinstances;
pipe->timeout = req->timeout;
pipe->flags = req->flags;
}
else
{
set_error( 0 ); /* clear the name collision */
if (pipe->maxinstances <= pipe->instances)
{
set_error( STATUS_PIPE_BUSY );
release_object( pipe );
return;
}
if ((pipe->maxinstances != req->maxinstances) ||
(pipe->timeout != req->timeout) ||
(pipe->flags != req->flags))
{
set_error( STATUS_ACCESS_DENIED );
release_object( pipe );
return;
}
}
server = create_pipe_server( pipe, req->options );
if (server)
{
reply->handle = alloc_handle( current->process, server,
req->access, req->inherit );
server->pipe->instances++;
release_object( server );
}
release_object( pipe );
}
DECL_HANDLER(open_named_pipe)
{
struct pipe_server *server;
struct pipe_client *client;
struct named_pipe *pipe;
int fds[2];
pipe = open_named_pipe( get_req_data(), get_req_data_size() );
if (!pipe)
{
set_error( STATUS_NO_SUCH_FILE );
return;
}
server = find_server2( pipe, ps_idle_server, ps_wait_open );
release_object( pipe );
if (!server)
{
set_error( STATUS_PIPE_NOT_AVAILABLE );
return;
}
client = create_pipe_client( server, req->flags );
if (client)
{
if (!socketpair( PF_UNIX, SOCK_STREAM, 0, fds ))
{
int res = 0;
assert( !client->fd );
assert( !server->fd );
/* for performance reasons, only set nonblocking mode when using
* overlapped I/O. Otherwise, we will be doing too much busy
* looping */
if (is_overlapped( req->flags ))
res = fcntl( fds[1], F_SETFL, O_NONBLOCK );
if ((res != -1) && is_overlapped( server->options ))
res = fcntl( fds[0], F_SETFL, O_NONBLOCK );
client->fd = create_anonymous_fd( &pipe_client_fd_ops,
fds[1], &client->obj );
server->fd = create_anonymous_fd( &pipe_server_fd_ops,
fds[0], &server->obj );
if (client->fd && server->fd && res != 1)
{
if (server->state == ps_wait_open)
async_terminate_head( &server->wait_q, STATUS_SUCCESS );
assert( list_empty( &server->wait_q ) );
server->state = ps_connected_server;
server->client = client;
client->server = server;
reply->handle = alloc_handle( current->process, client,
req->access, req->inherit );
}
}
else
file_set_error();
release_object( client );
}
release_object( server );
}
DECL_HANDLER(connect_named_pipe)
{
struct pipe_server *server;
server = get_pipe_server_obj(current->process, req->handle, 0);
if (!server)
return;
switch(server->state)
{
case ps_idle_server:
case ps_wait_connect:
assert( !server->fd );
server->state = ps_wait_open;
create_async( current, NULL, &server->wait_q,
req->func, req->event, NULL );
async_terminate_queue( &server->pipe->waiters, STATUS_SUCCESS );
break;
case ps_connected_server:
assert( server->fd );
set_error( STATUS_PIPE_CONNECTED );
break;
case ps_disconnected_server:
set_error( STATUS_PIPE_BUSY );
break;
case ps_wait_disconnect:
set_error( STATUS_NO_DATA_DETECTED );
break;
case ps_wait_open:
set_error( STATUS_INVALID_HANDLE );
break;
}
release_object(server);
}
DECL_HANDLER(wait_named_pipe)
{
struct named_pipe *pipe;
struct pipe_server *server;
if (!(pipe = open_named_pipe( get_req_data(), get_req_data_size() )))
{
set_error( STATUS_PIPE_NOT_AVAILABLE );
return;
}
server = find_server( pipe, ps_wait_open );
if (server)
{
/* there's already a server waiting for a client to connect */
thread_queue_apc( current, NULL, req->func, APC_ASYNC_IO,
1, req->overlapped, NULL, (void *)STATUS_SUCCESS );
release_object( server );
}
else
{
int timeout;
if (req->timeout == NMPWAIT_USE_DEFAULT_WAIT)
timeout = pipe->timeout;
else
timeout = req->timeout;
if (req->timeout == NMPWAIT_WAIT_FOREVER)
create_async( current, NULL, &pipe->waiters,
req->func, req->overlapped, NULL );
else
create_async( current, &timeout, &pipe->waiters,
req->func, req->overlapped, NULL );
}
release_object( pipe );
}
DECL_HANDLER(disconnect_named_pipe)
{
struct pipe_server *server;
reply->fd = -1;
server = get_pipe_server_obj( current->process, req->handle, 0 );
if (!server)
return;
switch(server->state)
{
case ps_connected_server:
assert( server->fd );
assert( server->client );
assert( server->client->fd );
notify_empty( server );
/* Dump the client and server fds, but keep the pointers
around - client loses all waiting data */
server->state = ps_disconnected_server;
do_disconnect( server );
reply->fd = flush_cached_fd( current->process, req->handle );
break;
case ps_wait_disconnect:
assert( !server->client );
assert( server->fd );
do_disconnect( server );
server->state = ps_wait_connect;
reply->fd = flush_cached_fd( current->process, req->handle );
break;
case ps_idle_server:
case ps_wait_open:
case ps_disconnected_server:
case ps_wait_connect:
set_error( STATUS_PIPE_DISCONNECTED );
break;
}
release_object( server );
}
DECL_HANDLER(get_named_pipe_info)
{
struct pipe_server *server;
server = get_pipe_server_obj( current->process, req->handle, 0 );
if (!server)
return;
reply->flags = server->pipe->flags;
reply->maxinstances = server->pipe->maxinstances;
reply->insize = server->pipe->insize;
reply->outsize = server->pipe->outsize;
release_object(server);
}
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