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
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*/
#include "config.h"
#include "wine/port.h"
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#include <assert.h>
#include <fcntl.h>
#include <string.h>
#include <stdarg.h>
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#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
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#ifdef HAVE_SYS_SOCKET_H
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#include <sys/socket.h>
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#endif
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#include <time.h>
#include <unistd.h>
#include "windef.h"
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#include "winbase.h"
#include "file.h"
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#include "handle.h"
#include "thread.h"
#include "request.h"
enum pipe_state
{
ps_none,
ps_idle_server,
ps_wait_open,
ps_connected_server,
ps_wait_disconnect,
ps_disconnected_server,
ps_wait_connect
};
struct wait_info
{
struct thread *thread;
void *func;
void *overlapped;
};
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struct named_pipe;
struct pipe_server
{
struct object obj;
struct fd *fd;
enum pipe_state state;
struct pipe_client *client;
struct named_pipe *pipe;
struct pipe_server *next;
struct pipe_server *prev;
struct timeout_user *flush_poll;
struct event *event;
struct wait_info wait;
};
struct pipe_client
{
struct object obj;
struct fd *fd;
struct pipe_server *server;
struct wait_info wait;
};
struct connect_wait
{
struct wait_info wait;
struct connect_wait *next;
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};
struct named_pipe
{
struct object obj; /* object header */
unsigned int pipemode;
unsigned int maxinstances;
unsigned int outsize;
unsigned int insize;
unsigned int timeout;
unsigned int instances;
struct pipe_server *servers;
struct connect_wait *connect_waiters;
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};
static void named_pipe_dump( struct object *obj, int verbose );
static void named_pipe_destroy( struct object *obj );
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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_get_fd, /* get_fd */
named_pipe_destroy /* destroy */
};
/* common to clients and servers */
static int pipe_end_get_poll_events( struct fd *fd );
static int pipe_end_get_info( struct fd *fd );
/* 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 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 */
pipe_server_get_fd, /* get_fd */
pipe_server_destroy /* destroy */
};
static const struct fd_ops pipe_server_fd_ops =
{
pipe_end_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
pipe_server_flush, /* flush */
pipe_end_get_info, /* get_file_info */
no_queue_async, /* queue_async */
no_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 );
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static const struct object_ops pipe_client_ops =
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{
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 */
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no_satisfied, /* satisfied */
pipe_client_get_fd, /* get_fd */
pipe_client_destroy /* destroy */
};
static const struct fd_ops pipe_client_fd_ops =
{
pipe_end_get_poll_events, /* get_poll_events */
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default_poll_event, /* poll_event */
pipe_client_flush, /* flush */
pipe_end_get_info, /* get_file_info */
no_queue_async, /* queue_async */
no_cancel_async /* cancel_async */
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};
static void named_pipe_dump( struct object *obj, int verbose )
{
struct named_pipe *pipe = (struct named_pipe *) obj;
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assert( obj->ops == &named_pipe_ops );
fprintf( stderr, "named pipe %p\n" ,pipe);
}
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 %p (state %d)\n",
server, server->state );
}
static void pipe_client_dump( struct object *obj, int verbose )
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{
struct pipe_client *client = (struct pipe_client *) obj;
assert( obj->ops == &pipe_server_ops );
fprintf( stderr, "named pipe client %p (server state %d)\n",
client, client->server->state );
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}
static void named_pipe_destroy( struct object *obj)
{
struct named_pipe *pipe = (struct named_pipe *) obj;
assert( !pipe->servers );
assert( !pipe->instances );
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}
static void notify_waiter( struct wait_info *wait, unsigned int status )
{
if( wait->thread && wait->func && wait->overlapped )
{
/* queue a system APC, to notify a waiting thread */
thread_queue_apc( wait->thread, NULL, wait->func, APC_ASYNC,
1, wait->overlapped, (void *)status, NULL );
}
if( wait->thread ) release_object( wait->thread );
wait->thread = NULL;
}
static void set_waiter( struct wait_info *wait, void *func, void *ov )
{
wait->thread = (struct thread *) grab_object( current );
wait->func = func;
wait->overlapped = ov;
}
static void notify_connect_waiters( struct named_pipe *pipe )
{
struct connect_wait *cw, **x = &pipe->connect_waiters;
while( *x )
{
cw = *x;
notify_waiter( &cw->wait, STATUS_SUCCESS );
release_object( pipe );
*x = cw->next;
free( cw );
}
}
static void queue_connect_waiter( struct named_pipe *pipe,
void *func, void *overlapped )
{
struct connect_wait *waiter;
waiter = mem_alloc( sizeof(*waiter) );
if( waiter )
{
set_waiter( &waiter->wait, func, overlapped );
waiter->next = pipe->connect_waiters;
pipe->connect_waiters = waiter;
grab_object( pipe );
}
}
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;
default:
assert( 0 );
}
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;
}
notify_waiter( &server->wait, STATUS_HANDLES_CLOSED );
assert( server->pipe->instances );
server->pipe->instances--;
/* remove server from pipe's server list */
if( server->next ) server->next->prev = server->prev;
if( server->prev ) server->prev->next = server->next;
else server->pipe->servers = server->next;
release_object( server->pipe );
}
static void pipe_client_destroy( struct object *obj)
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{
struct pipe_client *client = (struct pipe_client *)obj;
struct pipe_server *server = client->server;
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assert( obj->ops == &pipe_client_ops );
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notify_waiter( &client->wait, STATUS_HANDLES_CLOSED );
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;
default:
assert( 0 );
}
assert( server->client );
server->client = NULL;
client->server = NULL;
}
assert( !client->fd );
}
static int pipe_end_get_poll_events( struct fd *fd )
{
return POLLIN | POLLOUT; /* FIXME */
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}
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, 0 );
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, 0 );
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 int pipe_end_get_info( struct fd *fd )
{
return 0;
}
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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 )
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{
if( get_error() != STATUS_OBJECT_NAME_COLLISION )
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{
/* initialize it if it didn't already exist */
pipe->servers = 0;
pipe->instances = 0;
pipe->connect_waiters = NULL;
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}
}
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 )
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{
struct object *obj;
obj = get_handle_obj( process, handle, access, &pipe_server_ops );
return (struct pipe_server *) obj;
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}
static struct pipe_server *create_pipe_server( struct named_pipe *pipe )
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{
struct pipe_server *server;
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server = alloc_object( &pipe_server_ops );
if( !server )
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return NULL;
server->fd = NULL;
server->pipe = pipe;
server->state = ps_none;
server->client = NULL;
server->flush_poll = NULL;
server->wait.thread = NULL;
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/* add to list of pipe servers */
if ((server->next = pipe->servers)) server->next->prev = server;
server->prev = NULL;
pipe->servers = server;
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grab_object( pipe );
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return server;
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}
static struct pipe_client *create_pipe_client( struct pipe_server *server )
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{
struct pipe_client *client;
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client = alloc_object( &pipe_client_ops );
if( !client )
return NULL;
client->fd = NULL;
client->server = server;
client->wait.thread = NULL;
return client;
}
static struct pipe_server *find_server( struct named_pipe *pipe,
enum pipe_state state )
{
struct pipe_server *x;
for( x = pipe->servers; x; x = x->next )
if( x->state == state )
break;
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if( !x )
return NULL;
return (struct pipe_server *) grab_object( x );
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}
DECL_HANDLER(create_named_pipe)
{
struct named_pipe *pipe;
struct pipe_server *server;
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reply->handle = 0;
pipe = create_named_pipe( get_req_data(), get_req_data_size() );
if( !pipe )
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return;
if( get_error() != STATUS_OBJECT_NAME_COLLISION )
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{
pipe->insize = req->insize;
pipe->outsize = req->outsize;
pipe->maxinstances = req->maxinstances;
pipe->timeout = req->timeout;
pipe->pipemode = req->pipemode;
}
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->pipemode != req->pipemode ) )
{
set_error( STATUS_ACCESS_DENIED );
release_object( pipe );
return;
}
}
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server = create_pipe_server( pipe );
if(server)
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{
server->state = ps_idle_server;
reply->handle = alloc_handle( current->process, server,
GENERIC_READ|GENERIC_WRITE, req->inherit );
server->pipe->instances++;
release_object( server );
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}
release_object( pipe );
}
DECL_HANDLER(open_named_pipe)
{
struct pipe_server *server;
struct pipe_client *client;
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struct named_pipe *pipe;
int fds[2];
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reply->handle = 0;
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pipe = open_named_pipe( get_req_data(), get_req_data_size() );
if ( !pipe )
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{
set_error( STATUS_NO_SUCH_FILE );
return;
}
for( server = pipe->servers; server; server = server->next )
if( ( server->state==ps_idle_server ) ||
( server->state==ps_wait_open ) )
break;
release_object( pipe );
if ( !server )
{
set_error( STATUS_PIPE_NOT_AVAILABLE );
return;
}
client = create_pipe_client( server );
if( client )
{
if( !socketpair( PF_UNIX, SOCK_STREAM, 0, fds ) )
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{
assert( !client->fd );
assert( !server->fd );
client->fd = create_anonymous_fd( &pipe_server_fd_ops,
fds[1], &client->obj );
server->fd = create_anonymous_fd( &pipe_server_fd_ops,
fds[0], &server->obj );
if (client->fd && server->fd)
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{
if( server->state == ps_wait_open )
notify_waiter( &server->wait, STATUS_SUCCESS );
assert( !server->wait.thread );
server->state = ps_connected_server;
server->client = client;
client->server = server;
reply->handle = alloc_handle( current->process, client,
req->access, req->inherit );
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}
}
else
file_set_error();
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release_object( client );
}
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}
DECL_HANDLER(connect_named_pipe)
{
struct pipe_server *server;
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server = get_pipe_server_obj(current->process, req->handle, 0);
if(!server)
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return;
switch( server->state )
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{
case ps_idle_server:
case ps_wait_connect:
assert( !server->fd );
server->state = ps_wait_open;
set_waiter( &server->wait, req->func, req->overlapped );
notify_connect_waiters( server->pipe );
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;
default:
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 */
struct wait_info wait;
set_waiter( &wait, req->func, req->overlapped );
notify_waiter( &wait, STATUS_SUCCESS );
release_object( server );
}
else
queue_connect_waiter( pipe, req->func, req->overlapped );
release_object( pipe );
}
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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 );
notify_waiter( &server->client->wait, STATUS_PIPE_DISCONNECTED );
/* 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;
default:
set_error( STATUS_PIPE_DISCONNECTED );
}
release_object( server );
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}
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DECL_HANDLER(get_named_pipe_info)
{
struct pipe_server *server;
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server = get_pipe_server_obj( current->process, req->handle, 0 );
if(!server)
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return;
reply->flags = server->pipe->pipemode;
reply->maxinstances = server->pipe->maxinstances;
reply->insize = server->pipe->insize;
reply->outsize = server->pipe->outsize;
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release_object(server);
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}