Sweden-Number/server/named_pipe.c

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/*
* Server-side pipe management
*
* Copyright (C) 1998 Alexandre Julliard
* Copyright (C) 2001 Mike McCormack
*
* TODO:
* improve error handling
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*/
#include "config.h"
#include <assert.h>
#include <fcntl.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <time.h>
#include <unistd.h>
#include "winbase.h"
#include "handle.h"
#include "thread.h"
#include "request.h"
enum pipe_state
{
ps_none,
ps_idle_server,
ps_wait_open,
ps_wait_connect,
ps_connected_server,
ps_connected_client,
ps_disconnected
};
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struct named_pipe;
struct pipe_user
{
struct object obj;
enum pipe_state state;
struct pipe_user *other;
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struct named_pipe *pipe;
struct pipe_user *next;
struct pipe_user *prev;
void *thread;
void *func;
void *overlapped;
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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;
struct pipe_user *users;
};
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 */
NULL, /* get_poll_events */
NULL, /* poll_event */
no_get_fd, /* get_fd */
no_flush, /* flush */
no_get_file_info, /* get_file_info */
NULL, /* queue_async */
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named_pipe_destroy /* destroy */
};
static void pipe_user_dump( struct object *obj, int verbose );
static void pipe_user_destroy( struct object *obj);
static int pipe_user_get_fd( struct object *obj );
static int pipe_user_get_info( struct object *obj, struct get_file_info_reply *reply );
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static const struct object_ops pipe_user_ops =
{
sizeof(struct pipe_user), /* size */
pipe_user_dump, /* dump */
default_poll_add_queue, /* add_queue */
default_poll_remove_queue, /* remove_queue */
default_poll_signaled, /* signaled */
no_satisfied, /* satisfied */
NULL, /* get_poll_events */
default_poll_event, /* poll_event */
pipe_user_get_fd, /* get_fd */
no_flush, /* flush */
pipe_user_get_info, /* get_file_info */
NULL, /* queue_async */
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pipe_user_destroy /* destroy */
};
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 %p\n" ,pipe);
}
static void pipe_user_dump( struct object *obj, int verbose )
{
struct pipe_user *user = (struct pipe_user *)obj;
assert( obj->ops == &pipe_user_ops );
fprintf( stderr, "named pipe user %p (state %d)\n", user, user->state );
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}
static void named_pipe_destroy( struct object *obj)
{
struct named_pipe *pipe = (struct named_pipe *)obj;
assert( !pipe->users );
}
static void notify_waiter( struct pipe_user *user, unsigned int status)
{
if(user->thread && user->func && user->overlapped)
{
/* queue a system APC, to notify a waiting thread */
thread_queue_apc(user->thread,NULL,user->func,
APC_ASYNC,1,2,user->overlapped,status);
}
user->thread = NULL;
user->func = NULL;
user->overlapped=NULL;
}
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static void pipe_user_destroy( struct object *obj)
{
struct pipe_user *user = (struct pipe_user *)obj;
assert( obj->ops == &pipe_user_ops );
if(user->overlapped)
notify_waiter(user,STATUS_HANDLES_CLOSED);
if(user->other)
{
close(user->other->obj.fd);
user->other->obj.fd = -1;
switch(user->other->state)
{
case ps_connected_server:
user->other->state = ps_idle_server;
break;
case ps_connected_client:
user->other->state = ps_disconnected;
break;
default:
fprintf(stderr,"connected pipe has strange state %d!\n",
user->other->state);
}
user->other->other=NULL;
user->other = NULL;
}
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/* remove user from pipe's user list */
if (user->next) user->next->prev = user->prev;
if (user->prev) user->prev->next = user->next;
else user->pipe->users = user->next;
release_object(user->pipe);
}
static int pipe_user_get_fd( struct object *obj )
{
struct pipe_user *user = (struct pipe_user *)obj;
assert( obj->ops == &pipe_user_ops );
return user->obj.fd;
}
static int pipe_user_get_info( struct object *obj, struct get_file_info_reply *reply )
{
if (reply)
{
reply->type = FILE_TYPE_PIPE;
reply->attr = 0;
reply->access_time = 0;
reply->write_time = 0;
reply->size_high = 0;
reply->size_low = 0;
reply->links = 0;
reply->index_high = 0;
reply->index_low = 0;
reply->serial = 0;
}
return FD_TYPE_DEFAULT;
}
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static struct named_pipe *create_named_pipe( const WCHAR *name, size_t len )
{
struct named_pipe *pipe;
if ((pipe = create_named_object( &named_pipe_ops, name, len )))
{
if (get_error() != STATUS_OBJECT_NAME_COLLISION)
{
/* initialize it if it didn't already exist */
pipe->users = 0;
}
}
return pipe;
}
static struct pipe_user *get_pipe_user_obj( struct process *process, handle_t handle,
unsigned int access )
{
return (struct pipe_user *)get_handle_obj( process, handle, access, &pipe_user_ops );
}
static struct pipe_user *create_pipe_user( struct named_pipe *pipe, int fd )
{
struct pipe_user *user;
user = alloc_object( &pipe_user_ops, fd );
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if(!user)
return NULL;
user->pipe = pipe;
user->state = ps_none;
user->other = NULL;
user->thread = NULL;
user->func = NULL;
user->overlapped = NULL;
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/* add to list of pipe users */
if ((user->next = pipe->users)) user->next->prev = user;
user->prev = NULL;
pipe->users = user;
grab_object(pipe);
return user;
}
static struct pipe_user *find_partner(struct named_pipe *pipe, enum pipe_state state)
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{
struct pipe_user *x;
for(x = pipe->users; x; x=x->next)
{
if(x->state==state)
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break;
}
if(!x)
return NULL;
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return (struct pipe_user *)grab_object( x );
}
DECL_HANDLER(create_named_pipe)
{
struct named_pipe *pipe;
struct pipe_user *user;
reply->handle = 0;
pipe = create_named_pipe( get_req_data(), get_req_data_size() );
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if(!pipe)
return;
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if (get_error() != STATUS_OBJECT_NAME_COLLISION)
{
pipe->insize = req->insize;
pipe->outsize = req->outsize;
pipe->maxinstances = req->maxinstances;
pipe->timeout = req->timeout;
pipe->pipemode = req->pipemode;
}
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user = create_pipe_user (pipe, -1);
if(user)
{
user->state = ps_idle_server;
reply->handle = alloc_handle( current->process, user, GENERIC_READ|GENERIC_WRITE, 0 );
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release_object( user );
}
release_object( pipe );
}
DECL_HANDLER(open_named_pipe)
{
struct named_pipe *pipe;
reply->handle = 0;
pipe = create_named_pipe( get_req_data(), get_req_data_size() );
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if(!pipe)
return;
if (get_error() == STATUS_OBJECT_NAME_COLLISION)
{
struct pipe_user *partner;
if ((partner = find_partner(pipe, ps_wait_open)))
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{
int fds[2];
if(!socketpair(PF_UNIX, SOCK_STREAM, 0, fds))
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{
struct pipe_user *user;
if( (user = create_pipe_user (pipe, fds[1])) )
{
partner->obj.fd = fds[0];
notify_waiter(partner,STATUS_SUCCESS);
partner->state = ps_connected_server;
partner->other = user;
user->state = ps_connected_client;
user->other = partner;
reply->handle = alloc_handle( current->process, user, req->access, 0 );
release_object(user);
}
else
{
close(fds[0]);
}
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}
release_object( partner );
}
else
{
set_error(STATUS_PIPE_NOT_AVAILABLE);
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}
}
else
{
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set_error(STATUS_NO_SUCH_FILE);
}
release_object(pipe);
}
DECL_HANDLER(connect_named_pipe)
{
struct pipe_user *user, *partner;
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user = get_pipe_user_obj(current->process, req->handle, 0);
if(!user)
return;
if( user->state != ps_idle_server )
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{
set_error(STATUS_PORT_ALREADY_SET);
}
else
{
user->state = ps_wait_open;
user->thread = current;
user->func = req->func;
user->overlapped = req->overlapped;
/* notify all waiters that a pipe just became available */
while( (partner = find_partner(user->pipe,ps_wait_connect)) )
{
notify_waiter(partner,STATUS_SUCCESS);
release_object(partner);
release_object(partner);
}
}
release_object(user);
}
DECL_HANDLER(wait_named_pipe)
{
struct named_pipe *pipe;
pipe = create_named_pipe( get_req_data(), get_req_data_size() );
if( pipe )
{
/* only wait if the pipe already exists */
if(get_error() == STATUS_OBJECT_NAME_COLLISION)
{
struct pipe_user *partner;
set_error(STATUS_SUCCESS);
if( (partner = find_partner(pipe,ps_wait_open)) )
{
/* this should use notify_waiter,
but no pipe_user object exists now... */
thread_queue_apc(current,NULL,req->func,
APC_ASYNC,1,2,req->overlapped,STATUS_SUCCESS);
release_object(partner);
}
else
{
struct pipe_user *user;
if( (user = create_pipe_user (pipe, -1)) )
{
user->state = ps_wait_connect;
user->thread = current;
user->func = req->func;
user->overlapped = req->overlapped;
/* don't release it */
}
}
}
else
{
set_error(STATUS_PIPE_NOT_AVAILABLE);
}
release_object(pipe);
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}
}
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DECL_HANDLER(disconnect_named_pipe)
{
struct pipe_user *user;
user = get_pipe_user_obj(current->process, req->handle, 0);
if(!user)
return;
if( (user->state == ps_connected_server) &&
(user->other->state == ps_connected_client) )
{
close(user->other->obj.fd);
user->other->obj.fd = -1;
user->other->state = ps_disconnected;
user->other->other = NULL;
close(user->obj.fd);
user->obj.fd = -1;
user->state = ps_idle_server;
user->other = NULL;
}
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release_object(user);
}
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DECL_HANDLER(get_named_pipe_info)
{
struct pipe_user *user;
user = get_pipe_user_obj(current->process, req->handle, 0);
if(!user)
return;
reply->flags = user->pipe->pipemode;
reply->maxinstances = user->pipe->maxinstances;
reply->insize = user->pipe->insize;
reply->outsize = user->pipe->outsize;
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release_object(user);
}