Sweden-Number/server/hook.c

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/*
* Server-side window hooks support
*
* Copyright (C) 2002 Alexandre Julliard
*
* 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
*/
#include "config.h"
#include "wine/port.h"
#include <assert.h>
#include <stdio.h>
#include "winbase.h"
#include "winuser.h"
#include "object.h"
#include "request.h"
#include "user.h"
struct hook_table;
struct hook
{
struct list chain; /* hook chain entry */
user_handle_t handle; /* user handle for this hook */
struct thread *thread; /* thread owning the hook */
int index; /* hook table index */
void *proc; /* hook function */
int unicode; /* is it a unicode hook? */
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WCHAR *module; /* module name for global hooks */
size_t module_size;
};
#define NB_HOOKS (WH_MAXHOOK-WH_MINHOOK+1)
#define HOOK_ENTRY(p) LIST_ENTRY( (p), struct hook, chain )
struct hook_table
{
struct object obj; /* object header */
struct list hooks[NB_HOOKS]; /* array of hook chains */
int counts[NB_HOOKS]; /* use counts for each hook chain */
};
static void hook_table_dump( struct object *obj, int verbose );
static void hook_table_destroy( struct object *obj );
static const struct object_ops hook_table_ops =
{
sizeof(struct hook_table), /* size */
hook_table_dump, /* dump */
no_add_queue, /* add_queue */
NULL, /* remove_queue */
NULL, /* signaled */
NULL, /* satisfied */
no_get_fd, /* get_fd */
hook_table_destroy /* destroy */
};
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static struct hook_table *global_hooks;
/* create a new hook table */
static struct hook_table *alloc_hook_table(void)
{
struct hook_table *table;
int i;
if ((table = alloc_object( &hook_table_ops )))
{
for (i = 0; i < NB_HOOKS; i++)
{
list_init( &table->hooks[i] );
table->counts[i] = 0;
}
}
return table;
}
/* create a new hook and add it to the specified table */
static struct hook *add_hook( struct thread *thread, int index )
{
struct hook *hook;
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struct hook_table *table = thread ? thread->hooks : global_hooks;
if (!table)
{
if (!(table = alloc_hook_table())) return NULL;
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if (thread) thread->hooks = table;
else global_hooks = table;
}
if (!(hook = mem_alloc( sizeof(*hook) ))) return NULL;
if (!(hook->handle = alloc_user_handle( hook, USER_HOOK )))
{
free( hook );
return NULL;
}
hook->thread = thread ? (struct thread *)grab_object( thread ) : NULL;
hook->index = index;
list_add_head( &table->hooks[index], &hook->chain );
return hook;
}
/* free a hook, removing it from its chain */
static void free_hook( struct hook *hook )
{
free_user_handle( hook->handle );
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if (hook->module) free( hook->module );
if (hook->thread) release_object( hook->thread );
list_remove( &hook->chain );
free( hook );
}
/* find a hook from its index and proc */
static struct hook *find_hook( struct thread *thread, int index, void *proc )
{
struct list *p;
struct hook_table *table = thread->hooks;
if (table)
{
LIST_FOR_EACH( p, &table->hooks[index] )
{
struct hook *hook = HOOK_ENTRY( p );
if (hook->proc == proc) return hook;
}
}
return NULL;
}
/* get the hook table that a given hook belongs to */
inline static struct hook_table *get_table( struct hook *hook )
{
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return hook->thread ? hook->thread->hooks : global_hooks;
}
/* get the first hook in the chain */
inline static struct hook *get_first_hook( struct hook_table *table, int index )
{
struct list *elem = list_head( &table->hooks[index] );
return elem ? HOOK_ENTRY( elem ) : NULL;
}
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/* find the first non-deleted hook in the chain */
inline static struct hook *get_first_valid_hook( struct hook_table *table, int index )
{
struct hook *hook = get_first_hook( table, index );
while (hook && !hook->proc)
hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) );
return hook;
}
/* find the next hook in the chain, skipping the deleted ones */
static struct hook *get_next_hook( struct hook *hook )
{
struct hook_table *table = get_table( hook );
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int index = hook->index;
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while ((hook = HOOK_ENTRY( list_next( &table->hooks[index], &hook->chain ) )))
{
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if (hook->proc) return hook;
}
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if (global_hooks && table != global_hooks) /* now search through the global table */
{
hook = get_first_valid_hook( global_hooks, index );
}
return hook;
}
static void hook_table_dump( struct object *obj, int verbose )
{
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struct hook_table *table = (struct hook_table *)obj;
if (table == global_hooks) fprintf( stderr, "Global hook table\n" );
else fprintf( stderr, "Hook table\n" );
}
static void hook_table_destroy( struct object *obj )
{
int i;
struct hook *hook;
struct hook_table *table = (struct hook_table *)obj;
for (i = 0; i < NB_HOOKS; i++)
{
while ((hook = get_first_hook( table, i )) != NULL) free_hook( hook );
}
}
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/* free the global hooks table */
void close_global_hooks(void)
{
if (global_hooks) release_object( global_hooks );
}
/* remove a hook, freeing it if the chain is not in use */
static void remove_hook( struct hook *hook )
{
struct hook_table *table = get_table( hook );
if (table->counts[hook->index])
hook->proc = NULL; /* chain is in use, just mark it and return */
else
free_hook( hook );
}
/* release a hook chain, removing deleted hooks if the use count drops to 0 */
static void release_hook_chain( struct hook_table *table, int index )
{
if (!table->counts[index]) /* use count shouldn't already be 0 */
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!--table->counts[index])
{
struct hook *hook = get_first_hook( table, index );
while (hook)
{
struct hook *next = HOOK_ENTRY( list_next( &table->hooks[hook->index], &hook->chain ) );
if (!hook->proc) free_hook( hook );
hook = next;
}
}
}
/* set a window hook */
DECL_HANDLER(set_hook)
{
struct thread *thread;
struct hook *hook;
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WCHAR *module;
size_t module_size = get_req_data_size();
if (!req->proc || req->id < WH_MINHOOK || req->id > WH_MAXHOOK)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
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if (!req->tid)
{
if (!module_size)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!(module = memdup( get_req_data(), module_size ))) return;
thread = NULL;
}
else
{
module = NULL;
if (!(thread = get_thread_from_id( req->tid ))) return;
}
if ((hook = add_hook( thread, req->id - WH_MINHOOK )))
{
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hook->proc = req->proc;
hook->unicode = req->unicode;
hook->module = module;
hook->module_size = module_size;
reply->handle = hook->handle;
}
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else if (module) free( module );
if (thread) release_object( thread );
}
/* remove a window hook */
DECL_HANDLER(remove_hook)
{
struct hook *hook;
if (req->handle) hook = get_user_object( req->handle, USER_HOOK );
else
{
if (!req->proc || req->id < WH_MINHOOK || req->id > WH_MAXHOOK)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (!(hook = find_hook( current, req->id - WH_MINHOOK, req->proc )))
set_error( STATUS_INVALID_PARAMETER );
}
if (hook) remove_hook( hook );
}
/* start calling a hook chain */
DECL_HANDLER(start_hook_chain)
{
struct hook *hook;
struct hook_table *table = current->hooks;
if (req->id < WH_MINHOOK || req->id > WH_MAXHOOK)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
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if (!table || !(hook = get_first_valid_hook( table, req->id - WH_MINHOOK )))
{
/* try global table */
if (!(table = global_hooks) ||
!(hook = get_first_valid_hook( global_hooks, req->id - WH_MINHOOK )))
return; /* no hook set */
}
reply->handle = hook->handle;
reply->proc = hook->proc;
reply->unicode = hook->unicode;
table->counts[hook->index]++;
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if (hook->module) set_reply_data( hook->module, hook->module_size );
}
/* finished calling a hook chain */
DECL_HANDLER(finish_hook_chain)
{
struct hook_table *table = current->hooks;
int index = req->id - WH_MINHOOK;
if (req->id < WH_MINHOOK || req->id > WH_MAXHOOK)
{
set_error( STATUS_INVALID_PARAMETER );
return;
}
if (table) release_hook_chain( table, index );
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if (global_hooks) release_hook_chain( global_hooks, index );
}
/* get the next hook to call */
DECL_HANDLER(get_next_hook)
{
struct hook *hook, *next;
if (!(hook = get_user_object( req->handle, USER_HOOK ))) return;
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if (hook->thread && (hook->thread != current))
{
set_error( STATUS_INVALID_HANDLE );
return;
}
if ((next = get_next_hook( hook )))
{
reply->next = next->handle;
reply->id = next->index + WH_MINHOOK;
reply->proc = next->proc;
reply->prev_unicode = hook->unicode;
reply->next_unicode = next->unicode;
if (next->module) set_reply_data( next->module, next->module_size );
}
}