ServerExe/HookDll/hookdll.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Seamless windows - Remote server hook DLL

   Based on code copyright (C) 2004-2005 Martin Wickett

   Copyright (C) Peter Åstrand <astrand@cendio.se> 2005-2006
   Copyright (C) Pierre Ossman <ossman@cendio.se> 2006

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <stdio.h>
#include <stdarg.h>

#include <windows.h>
#include <winuser.h>

#include "../vchannel.h"

#define DLL_EXPORT __declspec(dllexport)

#ifdef __GNUC__
#define SHARED __attribute__((section ("SHAREDDATA"), shared))
#else
#define SHARED
#endif

// Shared DATA
#pragma data_seg ( "SHAREDDATA" )

// this is the total number of processes this dll is currently attached to
int g_instance_count SHARED = 0;

// blocks for locally generated events
HWND g_block_move_hwnd SHARED = NULL;
unsigned int g_block_move_serial SHARED = 0;
RECT g_block_move SHARED = { 0, 0, 0, 0 };

unsigned int g_blocked_zchange_serial SHARED = 0;
HWND g_blocked_zchange[2] SHARED = { NULL, NULL };

unsigned int g_blocked_focus_serial SHARED = 0;
HWND g_blocked_focus SHARED = NULL;

unsigned int g_blocked_state_serial SHARED = 0;
HWND g_blocked_state_hwnd SHARED = NULL;
int g_blocked_state SHARED = -1;

#pragma data_seg ()

#pragma comment(linker, "/section:SHAREDDATA,rws")

#define FOCUS_MSG_NAME "WM_SEAMLESS_FOCUS"
static UINT g_wm_seamless_focus;

static HHOOK g_cbt_hook = NULL;
static HHOOK g_wndproc_hook = NULL;
static HHOOK g_wndprocret_hook = NULL;

static HINSTANCE g_instance = NULL;

static HANDLE g_mutex = NULL;

static void
update_position(HWND hwnd)
{
        RECT rect, blocked;
        HWND blocked_hwnd;
        unsigned int serial;

        WaitForSingleObject(g_mutex, INFINITE);
        blocked_hwnd = g_block_move_hwnd;
        serial = g_block_move_serial;
        memcpy(&blocked, &g_block_move, sizeof(RECT));
        ReleaseMutex(g_mutex);

        vchannel_block();

        if (!GetWindowRect(hwnd, &rect))
        {
                debug("GetWindowRect failed!\n");
                goto end;
        }

        if ((hwnd == blocked_hwnd) && (rect.left == blocked.left) && (rect.top == blocked.top)
            && (rect.right == blocked.right) && (rect.bottom == blocked.bottom))
                goto end;

        vchannel_write("POSITION", "0x%p,%d,%d,%d,%d,0x%x",
                       hwnd,
                       rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 0);

      end:
        vchannel_unblock();
}

static void
update_zorder(HWND hwnd)
{
        HWND behind;
        HWND block_hwnd, block_behind;
        unsigned int serial;

        WaitForSingleObject(g_mutex, INFINITE);
        serial = g_blocked_zchange_serial;
        block_hwnd = g_blocked_zchange[0];
        block_behind = g_blocked_zchange[1];
        ReleaseMutex(g_mutex);

        vchannel_block();

        behind = GetNextWindow(hwnd, GW_HWNDPREV);
        while (behind)
        {
                LONG style;

                style = GetWindowLong(behind, GWL_STYLE);

                if ((!(style & WS_CHILD) || (style & WS_POPUP)) && (style & WS_VISIBLE))
                        break;

                behind = GetNextWindow(behind, GW_HWNDPREV);
        }

        if ((hwnd == block_hwnd) && (behind == block_behind))
                vchannel_write("ACK", "%u", serial);
        else
                vchannel_write("ZCHANGE", "0x%p,0x%p,0x%x", hwnd, behind, 0);

        vchannel_unblock();
}

static LRESULT CALLBACK
wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
{
        HWND hwnd, parent;
        UINT msg;
        WPARAM wparam;
        LPARAM lparam;

        LONG style;

        if (code < 0)
                goto end;

        hwnd = ((CWPSTRUCT *) details)->hwnd;
        msg = ((CWPSTRUCT *) details)->message;
        wparam = ((CWPSTRUCT *) details)->wParam;
        lparam = ((CWPSTRUCT *) details)->lParam;

        style = GetWindowLong(hwnd, GWL_STYLE);

        /* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
           but they exist nonetheless. */
        if ((style & WS_CHILD) && !(style & WS_POPUP))
                goto end;

        if (style & WS_POPUP)
        {
                parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
                if (!parent)
                        parent = (HWND) - 1;
        }
        else
                parent = NULL;

        switch (msg)
        {
                case WM_WINDOWPOSCHANGED:
                        {
                                WINDOWPOS *wp = (WINDOWPOS *) lparam;

                                if (wp->flags & SWP_SHOWWINDOW)
                                {
                                        unsigned short title[150];
                                        int state;
                                        DWORD pid;
                                        int flags;

                                        GetWindowThreadProcessId(hwnd, &pid);

                                        flags = 0;
                                        if (style & DS_MODALFRAME)
                                                flags |= SEAMLESS_CREATE_MODAL;

                                        vchannel_write("CREATE", "0x%08lx,0x%08lx,0x%08lx,0x%08x",
                                                       (long) hwnd, (long) pid, (long) parent,
                                                       flags);

                                        GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));

                                        vchannel_write("TITLE", "0x%x,%s,0x%x", hwnd,
                                                       vchannel_strfilter_unicode(title), 0);

                                        if (style & WS_MAXIMIZE)
                                                state = 2;
                                        else if (style & WS_MINIMIZE)
                                                state = 1;
                                        else
                                                state = 0;

                                        update_position(hwnd);

                                        vchannel_write("STATE", "0x%p,0x%x,0x%x", hwnd, state, 0);
                                }

                                if (wp->flags & SWP_HIDEWINDOW)
                                        vchannel_write("DESTROY", "0x%p,0x%x", hwnd, 0);

                                if (!(style & WS_VISIBLE) || (style & WS_MINIMIZE))
                                        break;

                                if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
                                        update_position(hwnd);

                                break;
                        }

                case WM_SIZE:
                        if (!(style & WS_VISIBLE) || (style & WS_MINIMIZE))
                                break;
                        update_position(hwnd);
                        break;

                case WM_MOVE:
                        if (!(style & WS_VISIBLE) || (style & WS_MINIMIZE))
                                break;
                        update_position(hwnd);
                        break;

                case WM_DESTROY:
                        if (!(style & WS_VISIBLE))
                                break;
                        vchannel_write("DESTROY", "0x%p,0x%x", hwnd, 0);
                        break;

                default:
                        break;
        }

      end:
        return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
}

static LRESULT CALLBACK
wndprocret_hook_proc(int code, WPARAM cur_thread, LPARAM details)
{
        HWND hwnd, parent;
        UINT msg;
        WPARAM wparam;
        LPARAM lparam;

        LONG style;

        if (code < 0)
                goto end;

        hwnd = ((CWPRETSTRUCT *) details)->hwnd;
        msg = ((CWPRETSTRUCT *) details)->message;
        wparam = ((CWPRETSTRUCT *) details)->wParam;
        lparam = ((CWPRETSTRUCT *) details)->lParam;

        style = GetWindowLong(hwnd, GWL_STYLE);

        /* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
           but they exist nonetheless. */
        if ((style & WS_CHILD) && !(style & WS_POPUP))
                goto end;

        if (style & WS_POPUP)
        {
                parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
                if (!parent)
                        parent = (HWND) - 1;
        }
        else
                parent = NULL;

        switch (msg)
        {
                case WM_WINDOWPOSCHANGED:
                        {
                                WINDOWPOS *wp = (WINDOWPOS *) lparam;

                                if (!(style & WS_VISIBLE) || (style & WS_MINIMIZE))
                                        break;

                                if (!(wp->flags & SWP_NOZORDER))
                                        update_zorder(hwnd);

                                break;
                        }


                case WM_SETTEXT:
                        {
                                unsigned short title[150];
                                if (!(style & WS_VISIBLE))
                                        break;
                                /* We cannot use the string in lparam because
                                   we need unicode. */
                                GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
                                vchannel_write("TITLE", "0x%p,%s,0x%x", hwnd,
                                               vchannel_strfilter_unicode(title), 0);
                                break;
                        }

                default:
                        break;
        }

        if (msg == g_wm_seamless_focus)
        {
                /* FIXME: SetActiveWindow() kills menus. Need to find a clean
                   way to solve this. */
                if ((GetActiveWindow() != hwnd) && !parent)
                        SetActiveWindow(hwnd);

                vchannel_write("ACK", "%u", g_blocked_focus_serial);
        }

      end:
        return CallNextHookEx(g_wndprocret_hook, code, cur_thread, details);
}

static LRESULT CALLBACK
cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
{
        if (code < 0)
                goto end;

        switch (code)
        {
                case HCBT_MINMAX:
                        {
                                int show, state, blocked;
                                HWND blocked_hwnd;
                                unsigned int serial;

                                WaitForSingleObject(g_mutex, INFINITE);
                                blocked_hwnd = g_blocked_state_hwnd;
                                serial = g_blocked_state_serial;
                                blocked = g_blocked_state;
                                ReleaseMutex(g_mutex);

                                show = LOWORD(lparam);

                                if ((show == SW_NORMAL) || (show == SW_SHOWNORMAL)
                                    || (show == SW_RESTORE))
                                        state = 0;
                                else if ((show == SW_MINIMIZE) || (show == SW_SHOWMINIMIZED))
                                        state = 1;
                                else if ((show == SW_MAXIMIZE) || (show == SW_SHOWMAXIMIZED))
                                        state = 2;
                                else
                                {
                                        debug("Unexpected show: %d", show);
                                        break;
                                }

                                if ((blocked_hwnd == (HWND) wparam) && (blocked == state))
                                        vchannel_write("ACK", "%u", serial);
                                else
                                        vchannel_write("STATE", "0x%p,0x%x,0x%x", (HWND) wparam,
                                                       state, 0);

                                break;
                        }

                default:
                        break;
        }

      end:
        return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
}

DLL_EXPORT void
SetHooks(void)
{
        if (!g_cbt_hook)
                g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);

        if (!g_wndproc_hook)
                g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);

        if (!g_wndprocret_hook)
                g_wndprocret_hook =
                        SetWindowsHookEx(WH_CALLWNDPROCRET, wndprocret_hook_proc, g_instance, 0);
}

DLL_EXPORT void
RemoveHooks(void)
{
        if (g_cbt_hook)
                UnhookWindowsHookEx(g_cbt_hook);

        if (g_wndproc_hook)
                UnhookWindowsHookEx(g_wndproc_hook);

        if (g_wndprocret_hook)
                UnhookWindowsHookEx(g_wndprocret_hook);
}

DLL_EXPORT void
SafeMoveWindow(unsigned int serial, HWND hwnd, int x, int y, int width, int height)
{
        RECT rect;

        WaitForSingleObject(g_mutex, INFINITE);
        g_block_move_hwnd = hwnd;
        g_block_move_serial = serial;
        g_block_move.left = x;
        g_block_move.top = y;
        g_block_move.right = x + width;
        g_block_move.bottom = y + height;
        ReleaseMutex(g_mutex);

        SetWindowPos(hwnd, NULL, x, y, width, height, SWP_NOACTIVATE | SWP_NOZORDER);

        vchannel_write("ACK", "%u", serial);

        if (!GetWindowRect(hwnd, &rect))
                debug("GetWindowRect failed!\n");
        else if ((rect.left != x) || (rect.top != y) || (rect.right != x + width)
                 || (rect.bottom != y + height))
                update_position(hwnd);

        WaitForSingleObject(g_mutex, INFINITE);
        g_block_move_hwnd = NULL;
        memset(&g_block_move, 0, sizeof(RECT));
        ReleaseMutex(g_mutex);
}

DLL_EXPORT void
SafeZChange(unsigned int serial, HWND hwnd, HWND behind)
{
        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_zchange_serial = serial;
        g_blocked_zchange[0] = hwnd;
        g_blocked_zchange[1] = behind;
        ReleaseMutex(g_mutex);

        if (behind == NULL)
                behind = HWND_TOP;

        SetWindowPos(hwnd, behind, 0, 0, 0, 0, SWP_NOACTIVATE | SWP_NOMOVE | SWP_NOSIZE);

        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_zchange[0] = NULL;
        g_blocked_zchange[1] = NULL;
        ReleaseMutex(g_mutex);
}

DLL_EXPORT void
SafeFocus(unsigned int serial, HWND hwnd)
{
        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_focus_serial = serial;
        g_blocked_focus = hwnd;
        ReleaseMutex(g_mutex);

        SendMessage(hwnd, g_wm_seamless_focus, 0, 0);

        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_focus = NULL;
        ReleaseMutex(g_mutex);
}

DLL_EXPORT void
SafeSetState(unsigned int serial, HWND hwnd, int state)
{
        LONG style;
        int curstate;

        vchannel_block();

        style = GetWindowLong(hwnd, GWL_STYLE);

        if (style & WS_MAXIMIZE)
                curstate = 2;
        else if (style & WS_MINIMIZE)
                curstate = 1;
        else
                curstate = 0;

        if (state == curstate)
        {
                vchannel_write("ACK", "%u", serial);
                vchannel_unblock();
                return;
        }

        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_state_hwnd = hwnd;
        g_blocked_state_serial = serial;
        g_blocked_state = state;
        ReleaseMutex(g_mutex);

        vchannel_unblock();

        if (state == 0)
                ShowWindow(hwnd, SW_RESTORE);
        else if (state == 1)
                ShowWindow(hwnd, SW_MINIMIZE);
        else if (state == 2)
                ShowWindow(hwnd, SW_MAXIMIZE);
        else
                debug("Invalid state %d sent.", state);

        WaitForSingleObject(g_mutex, INFINITE);
        g_blocked_state_hwnd = NULL;
        g_blocked_state = -1;
        ReleaseMutex(g_mutex);
}

DLL_EXPORT int
GetInstanceCount()
{
        return g_instance_count;
}

BOOL APIENTRY
DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
{
        switch (ul_reason_for_call)
        {
                case DLL_PROCESS_ATTACH:
                        // remember our instance handle
                        g_instance = hinstDLL;

                        g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
                        if (!g_mutex)
                                return FALSE;

                        WaitForSingleObject(g_mutex, INFINITE);
                        ++g_instance_count;
                        ReleaseMutex(g_mutex);

                        g_wm_seamless_focus = RegisterWindowMessage(FOCUS_MSG_NAME);

                        vchannel_open();

                        break;

                case DLL_THREAD_ATTACH:
                        break;

                case DLL_THREAD_DETACH:
                        break;

                case DLL_PROCESS_DETACH:
                        WaitForSingleObject(g_mutex, INFINITE);
                        --g_instance_count;
                        ReleaseMutex(g_mutex);

                        vchannel_close();

                        CloseHandle(g_mutex);

                        break;
        }

        return TRUE;
}
1	/* -- c-basic-offset: 8 --
2	rdesktop: A Remote Desktop Protocol client.
3	Seamless windows - Remote server hook DLL
4
5	Based on code copyright (C) 2004-2005 Martin Wickett
6
7	Copyright (C) Peter Åstrand <astrand@cendio.se> 2005-2006
8	Copyright (C) Pierre Ossman <ossman@cendio.se> 2006
9
10	This program is free software; you can redistribute it and/or modify
11	it under the terms of the GNU General Public License as published by
12	the Free Software Foundation; either version 2 of the License, or
13	(at your option) any later version.
14
15	This program is distributed in the hope that it will be useful,
16	but WITHOUT ANY WARRANTY; without even the implied warranty of
17	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18	GNU General Public License for more details.
19
20	You should have received a copy of the GNU General Public License
21	along with this program; if not, write to the Free Software
22	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23	*/
24
25	#include <stdio.h>
26	#include <stdarg.h>
27
28	#include <windows.h>
29	#include <winuser.h>
30
31	#include "../vchannel.h"
32
33	#define DLL_EXPORT __declspec(dllexport)
34
35	#ifdef __GNUC__
36	#define SHARED __attribute__((section ("SHAREDDATA"), shared))
37	#else
38	#define SHARED
39	#endif
40
41	// Shared DATA
42	#pragma data_seg ( "SHAREDDATA" )
43
44	// this is the total number of processes this dll is currently attached to
45	int g_instance_count SHARED = 0;
46
47	// blocks for locally generated events
48	HWND g_block_move_hwnd SHARED = NULL;
49	unsigned int g_block_move_serial SHARED = 0;
50	RECT g_block_move SHARED = { 0, 0, 0, 0 };
51
52	unsigned int g_blocked_zchange_serial SHARED = 0;
53	HWND g_blocked_zchange[2] SHARED = { NULL, NULL };
54
55	unsigned int g_blocked_focus_serial SHARED = 0;
56	HWND g_blocked_focus SHARED = NULL;
57
58	unsigned int g_blocked_state_serial SHARED = 0;
59	HWND g_blocked_state_hwnd SHARED = NULL;
60	int g_blocked_state SHARED = -1;
61
62	#pragma data_seg ()
63
64	#pragma comment(linker, "/section:SHAREDDATA,rws")
65
66	#define FOCUS_MSG_NAME "WM_SEAMLESS_FOCUS"
67	static UINT g_wm_seamless_focus;
68
69	static HHOOK g_cbt_hook = NULL;
70	static HHOOK g_wndproc_hook = NULL;
71	static HHOOK g_wndprocret_hook = NULL;
72
73	static HINSTANCE g_instance = NULL;
74
75	static HANDLE g_mutex = NULL;
76
77	static void
78	update_position(HWND hwnd)
79	{
80	RECT rect, blocked;
81	HWND blocked_hwnd;
82	unsigned int serial;
83
84	WaitForSingleObject(g_mutex, INFINITE);
85	blocked_hwnd = g_block_move_hwnd;
86	serial = g_block_move_serial;
87	memcpy(&blocked, &g_block_move, sizeof(RECT));
88	ReleaseMutex(g_mutex);
89
90	vchannel_block();
91
92	if (!GetWindowRect(hwnd, &rect))
93	{
94	debug("GetWindowRect failed!\n");
95	goto end;
96	}
97
98	if ((hwnd == blocked_hwnd) && (rect.left == blocked.left) && (rect.top == blocked.top)
99	&& (rect.right == blocked.right) && (rect.bottom == blocked.bottom))
100	goto end;
101
102	vchannel_write("POSITION", "0x%p,%d,%d,%d,%d,0x%x",
103	hwnd,
104	rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 0);
105
106	end:
107	vchannel_unblock();
108	}
109
110	static void
111	update_zorder(HWND hwnd)
112	{
113	HWND behind;
114	HWND block_hwnd, block_behind;
115	unsigned int serial;
116
117	WaitForSingleObject(g_mutex, INFINITE);
118	serial = g_blocked_zchange_serial;
119	block_hwnd = g_blocked_zchange[0];
120	block_behind = g_blocked_zchange[1];
121	ReleaseMutex(g_mutex);
122
123	vchannel_block();
124
125	behind = GetNextWindow(hwnd, GW_HWNDPREV);
126	while (behind)
127	{
128	LONG style;
129
130	style = GetWindowLong(behind, GWL_STYLE);
131
132	if ((!(style & WS_CHILD) \|\| (style & WS_POPUP)) && (style & WS_VISIBLE))
133	break;
134
135	behind = GetNextWindow(behind, GW_HWNDPREV);
136	}
137
138	if ((hwnd == block_hwnd) && (behind == block_behind))
139	vchannel_write("ACK", "%u", serial);
140	else
141	vchannel_write("ZCHANGE", "0x%p,0x%p,0x%x", hwnd, behind, 0);
142
143	vchannel_unblock();
144	}
145
146	static LRESULT CALLBACK
147	wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
148	{
149	HWND hwnd, parent;
150	UINT msg;
151	WPARAM wparam;
152	LPARAM lparam;
153
154	LONG style;
155
156	if (code < 0)
157	goto end;
158
159	hwnd = ((CWPSTRUCT *) details)->hwnd;
160	msg = ((CWPSTRUCT *) details)->message;
161	wparam = ((CWPSTRUCT *) details)->wParam;
162	lparam = ((CWPSTRUCT *) details)->lParam;
163
164	style = GetWindowLong(hwnd, GWL_STYLE);
165
166	/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
167	but they exist nonetheless. */
168	if ((style & WS_CHILD) && !(style & WS_POPUP))
169	goto end;
170
171	if (style & WS_POPUP)
172	{
173	parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
174	if (!parent)
175	parent = (HWND) - 1;
176	}
177	else
178	parent = NULL;
179
180	switch (msg)
181	{
182	case WM_WINDOWPOSCHANGED:
183	{
184	WINDOWPOS wp = (WINDOWPOS ) lparam;
185
186	if (wp->flags & SWP_SHOWWINDOW)
187	{
188	unsigned short title[150];
189	int state;
190	DWORD pid;
191	int flags;
192
193	GetWindowThreadProcessId(hwnd, &pid);
194
195	flags = 0;
196	if (style & DS_MODALFRAME)
197	flags \|= SEAMLESS_CREATE_MODAL;
198
199	vchannel_write("CREATE", "0x%08lx,0x%08lx,0x%08lx,0x%08x",
200	(long) hwnd, (long) pid, (long) parent,
201	flags);
202
203	GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
204
205	vchannel_write("TITLE", "0x%x,%s,0x%x", hwnd,
206	vchannel_strfilter_unicode(title), 0);
207
208	if (style & WS_MAXIMIZE)
209	state = 2;
210	else if (style & WS_MINIMIZE)
211	state = 1;
212	else
213	state = 0;
214
215	update_position(hwnd);
216
217	vchannel_write("STATE", "0x%p,0x%x,0x%x", hwnd, state, 0);
218	}
219
220	if (wp->flags & SWP_HIDEWINDOW)
221	vchannel_write("DESTROY", "0x%p,0x%x", hwnd, 0);
222
223	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
224	break;
225
226	if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
227	update_position(hwnd);
228
229	break;
230	}
231
232	case WM_SIZE:
233	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
234	break;
235	update_position(hwnd);
236	break;
237
238	case WM_MOVE:
239	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
240	break;
241	update_position(hwnd);
242	break;
243
244	case WM_DESTROY:
245	if (!(style & WS_VISIBLE))
246	break;
247	vchannel_write("DESTROY", "0x%p,0x%x", hwnd, 0);
248	break;
249
250	default:
251	break;
252	}
253
254	end:
255	return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
256	}
257
258	static LRESULT CALLBACK
259	wndprocret_hook_proc(int code, WPARAM cur_thread, LPARAM details)
260	{
261	HWND hwnd, parent;
262	UINT msg;
263	WPARAM wparam;
264	LPARAM lparam;
265
266	LONG style;
267
268	if (code < 0)
269	goto end;
270
271	hwnd = ((CWPRETSTRUCT *) details)->hwnd;
272	msg = ((CWPRETSTRUCT *) details)->message;
273	wparam = ((CWPRETSTRUCT *) details)->wParam;
274	lparam = ((CWPRETSTRUCT *) details)->lParam;
275
276	style = GetWindowLong(hwnd, GWL_STYLE);
277
278	/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
279	but they exist nonetheless. */
280	if ((style & WS_CHILD) && !(style & WS_POPUP))
281	goto end;
282
283	if (style & WS_POPUP)
284	{
285	parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
286	if (!parent)
287	parent = (HWND) - 1;
288	}
289	else
290	parent = NULL;
291
292	switch (msg)
293	{
294	case WM_WINDOWPOSCHANGED:
295	{
296	WINDOWPOS wp = (WINDOWPOS ) lparam;
297
298	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
299	break;
300
301	if (!(wp->flags & SWP_NOZORDER))
302	update_zorder(hwnd);
303
304	break;
305	}
306
307
308	case WM_SETTEXT:
309	{
310	unsigned short title[150];
311	if (!(style & WS_VISIBLE))
312	break;
313	/* We cannot use the string in lparam because
314	we need unicode. */
315	GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
316	vchannel_write("TITLE", "0x%p,%s,0x%x", hwnd,
317	vchannel_strfilter_unicode(title), 0);
318	break;
319	}
320
321	default:
322	break;
323	}
324
325	if (msg == g_wm_seamless_focus)
326	{
327	/* FIXME: SetActiveWindow() kills menus. Need to find a clean
328	way to solve this. */
329	if ((GetActiveWindow() != hwnd) && !parent)
330	SetActiveWindow(hwnd);
331
332	vchannel_write("ACK", "%u", g_blocked_focus_serial);
333	}
334
335	end:
336	return CallNextHookEx(g_wndprocret_hook, code, cur_thread, details);
337	}
338
339	static LRESULT CALLBACK
340	cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
341	{
342	if (code < 0)
343	goto end;
344
345	switch (code)
346	{
347	case HCBT_MINMAX:
348	{
349	int show, state, blocked;
350	HWND blocked_hwnd;
351	unsigned int serial;
352
353	WaitForSingleObject(g_mutex, INFINITE);
354	blocked_hwnd = g_blocked_state_hwnd;
355	serial = g_blocked_state_serial;
356	blocked = g_blocked_state;
357	ReleaseMutex(g_mutex);
358
359	show = LOWORD(lparam);
360
361	if ((show == SW_NORMAL) \|\| (show == SW_SHOWNORMAL)
362	\|\| (show == SW_RESTORE))
363	state = 0;
364	else if ((show == SW_MINIMIZE) \|\| (show == SW_SHOWMINIMIZED))
365	state = 1;
366	else if ((show == SW_MAXIMIZE) \|\| (show == SW_SHOWMAXIMIZED))
367	state = 2;
368	else
369	{
370	debug("Unexpected show: %d", show);
371	break;
372	}
373
374	if ((blocked_hwnd == (HWND) wparam) && (blocked == state))
375	vchannel_write("ACK", "%u", serial);
376	else
377	vchannel_write("STATE", "0x%p,0x%x,0x%x", (HWND) wparam,
378	state, 0);
379
380	break;
381	}
382
383	default:
384	break;
385	}
386
387	end:
388	return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
389	}
390
391	DLL_EXPORT void
392	SetHooks(void)
393	{
394	if (!g_cbt_hook)
395	g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);
396
397	if (!g_wndproc_hook)
398	g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);
399
400	if (!g_wndprocret_hook)
401	g_wndprocret_hook =
402	SetWindowsHookEx(WH_CALLWNDPROCRET, wndprocret_hook_proc, g_instance, 0);
403	}
404
405	DLL_EXPORT void
406	RemoveHooks(void)
407	{
408	if (g_cbt_hook)
409	UnhookWindowsHookEx(g_cbt_hook);
410
411	if (g_wndproc_hook)
412	UnhookWindowsHookEx(g_wndproc_hook);
413
414	if (g_wndprocret_hook)
415	UnhookWindowsHookEx(g_wndprocret_hook);
416	}
417
418	DLL_EXPORT void
419	SafeMoveWindow(unsigned int serial, HWND hwnd, int x, int y, int width, int height)
420	{
421	RECT rect;
422
423	WaitForSingleObject(g_mutex, INFINITE);
424	g_block_move_hwnd = hwnd;
425	g_block_move_serial = serial;
426	g_block_move.left = x;
427	g_block_move.top = y;
428	g_block_move.right = x + width;
429	g_block_move.bottom = y + height;
430	ReleaseMutex(g_mutex);
431
432	SetWindowPos(hwnd, NULL, x, y, width, height, SWP_NOACTIVATE \| SWP_NOZORDER);
433
434	vchannel_write("ACK", "%u", serial);
435
436	if (!GetWindowRect(hwnd, &rect))
437	debug("GetWindowRect failed!\n");
438	else if ((rect.left != x) \|\| (rect.top != y) \|\| (rect.right != x + width)
439	\|\| (rect.bottom != y + height))
440	update_position(hwnd);
441
442	WaitForSingleObject(g_mutex, INFINITE);
443	g_block_move_hwnd = NULL;
444	memset(&g_block_move, 0, sizeof(RECT));
445	ReleaseMutex(g_mutex);
446	}
447
448	DLL_EXPORT void
449	SafeZChange(unsigned int serial, HWND hwnd, HWND behind)
450	{
451	WaitForSingleObject(g_mutex, INFINITE);
452	g_blocked_zchange_serial = serial;
453	g_blocked_zchange[0] = hwnd;
454	g_blocked_zchange[1] = behind;
455	ReleaseMutex(g_mutex);
456
457	if (behind == NULL)
458	behind = HWND_TOP;
459
460	SetWindowPos(hwnd, behind, 0, 0, 0, 0, SWP_NOACTIVATE \| SWP_NOMOVE \| SWP_NOSIZE);
461
462	WaitForSingleObject(g_mutex, INFINITE);
463	g_blocked_zchange[0] = NULL;
464	g_blocked_zchange[1] = NULL;
465	ReleaseMutex(g_mutex);
466	}
467
468	DLL_EXPORT void
469	SafeFocus(unsigned int serial, HWND hwnd)
470	{
471	WaitForSingleObject(g_mutex, INFINITE);
472	g_blocked_focus_serial = serial;
473	g_blocked_focus = hwnd;
474	ReleaseMutex(g_mutex);
475
476	SendMessage(hwnd, g_wm_seamless_focus, 0, 0);
477
478	WaitForSingleObject(g_mutex, INFINITE);
479	g_blocked_focus = NULL;
480	ReleaseMutex(g_mutex);
481	}
482
483	DLL_EXPORT void
484	SafeSetState(unsigned int serial, HWND hwnd, int state)
485	{
486	LONG style;
487	int curstate;
488
489	vchannel_block();
490
491	style = GetWindowLong(hwnd, GWL_STYLE);
492
493	if (style & WS_MAXIMIZE)
494	curstate = 2;
495	else if (style & WS_MINIMIZE)
496	curstate = 1;
497	else
498	curstate = 0;
499
500	if (state == curstate)
501	{
502	vchannel_write("ACK", "%u", serial);
503	vchannel_unblock();
504	return;
505	}
506
507	WaitForSingleObject(g_mutex, INFINITE);
508	g_blocked_state_hwnd = hwnd;
509	g_blocked_state_serial = serial;
510	g_blocked_state = state;
511	ReleaseMutex(g_mutex);
512
513	vchannel_unblock();
514
515	if (state == 0)
516	ShowWindow(hwnd, SW_RESTORE);
517	else if (state == 1)
518	ShowWindow(hwnd, SW_MINIMIZE);
519	else if (state == 2)
520	ShowWindow(hwnd, SW_MAXIMIZE);
521	else
522	debug("Invalid state %d sent.", state);
523
524	WaitForSingleObject(g_mutex, INFINITE);
525	g_blocked_state_hwnd = NULL;
526	g_blocked_state = -1;
527	ReleaseMutex(g_mutex);
528	}
529
530	DLL_EXPORT int
531	GetInstanceCount()
532	{
533	return g_instance_count;
534	}
535
536	BOOL APIENTRY
537	DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
538	{
539	switch (ul_reason_for_call)
540	{
541	case DLL_PROCESS_ATTACH:
542	// remember our instance handle
543	g_instance = hinstDLL;
544
545	g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
546	if (!g_mutex)
547	return FALSE;
548
549	WaitForSingleObject(g_mutex, INFINITE);
550	++g_instance_count;
551	ReleaseMutex(g_mutex);
552
553	g_wm_seamless_focus = RegisterWindowMessage(FOCUS_MSG_NAME);
554
555	vchannel_open();
556
557	break;
558
559	case DLL_THREAD_ATTACH:
560	break;
561
562	case DLL_THREAD_DETACH:
563	break;
564
565	case DLL_PROCESS_DETACH:
566	WaitForSingleObject(g_mutex, INFINITE);
567	--g_instance_count;
568	ReleaseMutex(g_mutex);
569
570	vchannel_close();
571
572	CloseHandle(g_mutex);
573
574	break;
575	}
576
577	return TRUE;
578	}