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 HWND
get_parent(HWND hwnd)
{
        LONG style;
        HWND parent;

        style = GetWindowLong(hwnd, GWL_STYLE);

        if (style & (WS_POPUP | DS_MODALFRAME))
        {
                parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);

                if (parent)
                {
                        style = GetWindowLong(parent, GWL_STYLE);
                        if (((style & WS_CHILD) && !(style & WS_POPUP)) || !(style & WS_VISIBLE))
                                parent = NULL;
                }

                if (!parent)
                        parent = GetWindow(hwnd, GW_OWNER);

                if (parent)
                {
                        style = GetWindowLong(parent, GWL_STYLE);
                        if (((style & WS_CHILD) && !(style & WS_POPUP)) || !(style & WS_VISIBLE))
                                parent = NULL;
                }

                if (!parent)
                        parent = (HWND) - 1;
        }
        else
                parent = NULL;

        return parent;
}

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;

        parent = get_parent(hwnd);

        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;

        parent = get_parent(hwnd);

        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: SetForegroundWindow() kills menus. Need to find a
                   clean way to solve this. */
                if ((GetForegroundWindow() != hwnd) && !parent)
                        SetForegroundWindow(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 HWND
147	get_parent(HWND hwnd)
148	{
149	LONG style;
150	HWND parent;
151
152	style = GetWindowLong(hwnd, GWL_STYLE);
153
154	if (style & (WS_POPUP \| DS_MODALFRAME))
155	{
156	parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
157
158	if (parent)
159	{
160	style = GetWindowLong(parent, GWL_STYLE);
161	if (((style & WS_CHILD) && !(style & WS_POPUP)) \|\| !(style & WS_VISIBLE))
162	parent = NULL;
163	}
164
165	if (!parent)
166	parent = GetWindow(hwnd, GW_OWNER);
167
168	if (parent)
169	{
170	style = GetWindowLong(parent, GWL_STYLE);
171	if (((style & WS_CHILD) && !(style & WS_POPUP)) \|\| !(style & WS_VISIBLE))
172	parent = NULL;
173	}
174
175	if (!parent)
176	parent = (HWND) - 1;
177	}
178	else
179	parent = NULL;
180
181	return parent;
182	}
183
184	static LRESULT CALLBACK
185	wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
186	{
187	HWND hwnd, parent;
188	UINT msg;
189	WPARAM wparam;
190	LPARAM lparam;
191
192	LONG style;
193
194	if (code < 0)
195	goto end;
196
197	hwnd = ((CWPSTRUCT *) details)->hwnd;
198	msg = ((CWPSTRUCT *) details)->message;
199	wparam = ((CWPSTRUCT *) details)->wParam;
200	lparam = ((CWPSTRUCT *) details)->lParam;
201
202	style = GetWindowLong(hwnd, GWL_STYLE);
203
204	/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
205	but they exist nonetheless. */
206	if ((style & WS_CHILD) && !(style & WS_POPUP))
207	goto end;
208
209	parent = get_parent(hwnd);
210
211	switch (msg)
212	{
213	case WM_WINDOWPOSCHANGED:
214	{
215	WINDOWPOS wp = (WINDOWPOS ) lparam;
216
217	if (wp->flags & SWP_SHOWWINDOW)
218	{
219	unsigned short title[150];
220	int state;
221	DWORD pid;
222	int flags;
223
224	GetWindowThreadProcessId(hwnd, &pid);
225
226	flags = 0;
227	if (style & DS_MODALFRAME)
228	flags \|= SEAMLESS_CREATE_MODAL;
229
230	vchannel_write("CREATE", "0x%08lx,0x%08lx,0x%08lx,0x%08x",
231	(long) hwnd, (long) pid, (long) parent,
232	flags);
233
234	GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
235
236	vchannel_write("TITLE", "0x%x,%s,0x%x", hwnd,
237	vchannel_strfilter_unicode(title), 0);
238
239	if (style & WS_MAXIMIZE)
240	state = 2;
241	else if (style & WS_MINIMIZE)
242	state = 1;
243	else
244	state = 0;
245
246	update_position(hwnd);
247
248	vchannel_write("STATE", "0x%p,0x%x,0x%x", hwnd, state, 0);
249	}
250
251	if (wp->flags & SWP_HIDEWINDOW)
252	vchannel_write("DESTROY", "0x%p,0x%x", hwnd, 0);
253
254	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
255	break;
256
257	if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
258	update_position(hwnd);
259
260	break;
261	}
262
263	case WM_SIZE:
264	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
265	break;
266	update_position(hwnd);
267	break;
268
269	case WM_MOVE:
270	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
271	break;
272	update_position(hwnd);
273	break;
274
275	case WM_DESTROY:
276	if (!(style & WS_VISIBLE))
277	break;
278	vchannel_write("DESTROY", "0x%p,0x%x", hwnd, 0);
279	break;
280
281	default:
282	break;
283	}
284
285	end:
286	return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
287	}
288
289	static LRESULT CALLBACK
290	wndprocret_hook_proc(int code, WPARAM cur_thread, LPARAM details)
291	{
292	HWND hwnd, parent;
293	UINT msg;
294	WPARAM wparam;
295	LPARAM lparam;
296
297	LONG style;
298
299	if (code < 0)
300	goto end;
301
302	hwnd = ((CWPRETSTRUCT *) details)->hwnd;
303	msg = ((CWPRETSTRUCT *) details)->message;
304	wparam = ((CWPRETSTRUCT *) details)->wParam;
305	lparam = ((CWPRETSTRUCT *) details)->lParam;
306
307	style = GetWindowLong(hwnd, GWL_STYLE);
308
309	/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
310	but they exist nonetheless. */
311	if ((style & WS_CHILD) && !(style & WS_POPUP))
312	goto end;
313
314	parent = get_parent(hwnd);
315
316	switch (msg)
317	{
318	case WM_WINDOWPOSCHANGED:
319	{
320	WINDOWPOS wp = (WINDOWPOS ) lparam;
321
322	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
323	break;
324
325	if (!(wp->flags & SWP_NOZORDER))
326	update_zorder(hwnd);
327
328	break;
329	}
330
331
332	case WM_SETTEXT:
333	{
334	unsigned short title[150];
335	if (!(style & WS_VISIBLE))
336	break;
337	/* We cannot use the string in lparam because
338	we need unicode. */
339	GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
340	vchannel_write("TITLE", "0x%p,%s,0x%x", hwnd,
341	vchannel_strfilter_unicode(title), 0);
342	break;
343	}
344
345	default:
346	break;
347	}
348
349	if (msg == g_wm_seamless_focus)
350	{
351	/* FIXME: SetForegroundWindow() kills menus. Need to find a
352	clean way to solve this. */
353	if ((GetForegroundWindow() != hwnd) && !parent)
354	SetForegroundWindow(hwnd);
355
356	vchannel_write("ACK", "%u", g_blocked_focus_serial);
357	}
358
359	end:
360	return CallNextHookEx(g_wndprocret_hook, code, cur_thread, details);
361	}
362
363	static LRESULT CALLBACK
364	cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
365	{
366	if (code < 0)
367	goto end;
368
369	switch (code)
370	{
371	case HCBT_MINMAX:
372	{
373	int show, state, blocked;
374	HWND blocked_hwnd;
375	unsigned int serial;
376
377	WaitForSingleObject(g_mutex, INFINITE);
378	blocked_hwnd = g_blocked_state_hwnd;
379	serial = g_blocked_state_serial;
380	blocked = g_blocked_state;
381	ReleaseMutex(g_mutex);
382
383	show = LOWORD(lparam);
384
385	if ((show == SW_NORMAL) \|\| (show == SW_SHOWNORMAL)
386	\|\| (show == SW_RESTORE))
387	state = 0;
388	else if ((show == SW_MINIMIZE) \|\| (show == SW_SHOWMINIMIZED))
389	state = 1;
390	else if ((show == SW_MAXIMIZE) \|\| (show == SW_SHOWMAXIMIZED))
391	state = 2;
392	else
393	{
394	debug("Unexpected show: %d", show);
395	break;
396	}
397
398	if ((blocked_hwnd == (HWND) wparam) && (blocked == state))
399	vchannel_write("ACK", "%u", serial);
400	else
401	vchannel_write("STATE", "0x%p,0x%x,0x%x", (HWND) wparam,
402	state, 0);
403
404	break;
405	}
406
407	default:
408	break;
409	}
410
411	end:
412	return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
413	}
414
415	DLL_EXPORT void
416	SetHooks(void)
417	{
418	if (!g_cbt_hook)
419	g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);
420
421	if (!g_wndproc_hook)
422	g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);
423
424	if (!g_wndprocret_hook)
425	g_wndprocret_hook =
426	SetWindowsHookEx(WH_CALLWNDPROCRET, wndprocret_hook_proc, g_instance, 0);
427	}
428
429	DLL_EXPORT void
430	RemoveHooks(void)
431	{
432	if (g_cbt_hook)
433	UnhookWindowsHookEx(g_cbt_hook);
434
435	if (g_wndproc_hook)
436	UnhookWindowsHookEx(g_wndproc_hook);
437
438	if (g_wndprocret_hook)
439	UnhookWindowsHookEx(g_wndprocret_hook);
440	}
441
442	DLL_EXPORT void
443	SafeMoveWindow(unsigned int serial, HWND hwnd, int x, int y, int width, int height)
444	{
445	RECT rect;
446
447	WaitForSingleObject(g_mutex, INFINITE);
448	g_block_move_hwnd = hwnd;
449	g_block_move_serial = serial;
450	g_block_move.left = x;
451	g_block_move.top = y;
452	g_block_move.right = x + width;
453	g_block_move.bottom = y + height;
454	ReleaseMutex(g_mutex);
455
456	SetWindowPos(hwnd, NULL, x, y, width, height, SWP_NOACTIVATE \| SWP_NOZORDER);
457
458	vchannel_write("ACK", "%u", serial);
459
460	if (!GetWindowRect(hwnd, &rect))
461	debug("GetWindowRect failed!\n");
462	else if ((rect.left != x) \|\| (rect.top != y) \|\| (rect.right != x + width)
463	\|\| (rect.bottom != y + height))
464	update_position(hwnd);
465
466	WaitForSingleObject(g_mutex, INFINITE);
467	g_block_move_hwnd = NULL;
468	memset(&g_block_move, 0, sizeof(RECT));
469	ReleaseMutex(g_mutex);
470	}
471
472	DLL_EXPORT void
473	SafeZChange(unsigned int serial, HWND hwnd, HWND behind)
474	{
475	WaitForSingleObject(g_mutex, INFINITE);
476	g_blocked_zchange_serial = serial;
477	g_blocked_zchange[0] = hwnd;
478	g_blocked_zchange[1] = behind;
479	ReleaseMutex(g_mutex);
480
481	if (behind == NULL)
482	behind = HWND_TOP;
483
484	SetWindowPos(hwnd, behind, 0, 0, 0, 0, SWP_NOACTIVATE \| SWP_NOMOVE \| SWP_NOSIZE);
485
486	WaitForSingleObject(g_mutex, INFINITE);
487	g_blocked_zchange[0] = NULL;
488	g_blocked_zchange[1] = NULL;
489	ReleaseMutex(g_mutex);
490	}
491
492	DLL_EXPORT void
493	SafeFocus(unsigned int serial, HWND hwnd)
494	{
495	WaitForSingleObject(g_mutex, INFINITE);
496	g_blocked_focus_serial = serial;
497	g_blocked_focus = hwnd;
498	ReleaseMutex(g_mutex);
499
500	SendMessage(hwnd, g_wm_seamless_focus, 0, 0);
501
502	WaitForSingleObject(g_mutex, INFINITE);
503	g_blocked_focus = NULL;
504	ReleaseMutex(g_mutex);
505	}
506
507	DLL_EXPORT void
508	SafeSetState(unsigned int serial, HWND hwnd, int state)
509	{
510	LONG style;
511	int curstate;
512
513	vchannel_block();
514
515	style = GetWindowLong(hwnd, GWL_STYLE);
516
517	if (style & WS_MAXIMIZE)
518	curstate = 2;
519	else if (style & WS_MINIMIZE)
520	curstate = 1;
521	else
522	curstate = 0;
523
524	if (state == curstate)
525	{
526	vchannel_write("ACK", "%u", serial);
527	vchannel_unblock();
528	return;
529	}
530
531	WaitForSingleObject(g_mutex, INFINITE);
532	g_blocked_state_hwnd = hwnd;
533	g_blocked_state_serial = serial;
534	g_blocked_state = state;
535	ReleaseMutex(g_mutex);
536
537	vchannel_unblock();
538
539	if (state == 0)
540	ShowWindow(hwnd, SW_RESTORE);
541	else if (state == 1)
542	ShowWindow(hwnd, SW_MINIMIZE);
543	else if (state == 2)
544	ShowWindow(hwnd, SW_MAXIMIZE);
545	else
546	debug("Invalid state %d sent.", state);
547
548	WaitForSingleObject(g_mutex, INFINITE);
549	g_blocked_state_hwnd = NULL;
550	g_blocked_state = -1;
551	ReleaseMutex(g_mutex);
552	}
553
554	DLL_EXPORT int
555	GetInstanceCount()
556	{
557	return g_instance_count;
558	}
559
560	BOOL APIENTRY
561	DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
562	{
563	switch (ul_reason_for_call)
564	{
565	case DLL_PROCESS_ATTACH:
566	// remember our instance handle
567	g_instance = hinstDLL;
568
569	g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
570	if (!g_mutex)
571	return FALSE;
572
573	WaitForSingleObject(g_mutex, INFINITE);
574	++g_instance_count;
575	ReleaseMutex(g_mutex);
576
577	g_wm_seamless_focus = RegisterWindowMessage(FOCUS_MSG_NAME);
578
579	vchannel_open();
580
581	break;
582
583	case DLL_THREAD_ATTACH:
584	break;
585
586	case DLL_THREAD_DETACH:
587	break;
588
589	case DLL_PROCESS_DETACH:
590	WaitForSingleObject(g_mutex, INFINITE);
591	--g_instance_count;
592	ReleaseMutex(g_mutex);
593
594	vchannel_close();
595
596	CloseHandle(g_mutex);
597
598	break;
599	}
600
601	return TRUE;
602	}