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)

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

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

#pragma data_seg ()

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

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;

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

        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);
}

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;

                                        vchannel_write("CREATE,0x%p,0x%p,0x%x", hwnd, parent, 0);

                                        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);

                                if (!(wp->flags & SWP_NOZORDER))
                                {
                                        vchannel_write("ZCHANGE,0x%p,0x%p,0x%x",
                                                       hwnd,
                                                       wp->flags & SWP_NOACTIVATE ? wp->
                                                       hwndInsertAfter : 0, 0);
                                }

                                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;

        switch (msg)
        {
                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;
        }

      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;

                                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;
                                }
                                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 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);

                        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	ossman_	1071	/* -- c-basic-offset: 8 --
2			rdesktop: A Remote Desktop Protocol client.
3			Seamless windows - Remote server hook DLL
4	ossman_	1069
5	ossman_	1071	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	ossman_	1069	#include <stdio.h>
26			#include <stdarg.h>
27
28	ossman_	1071	#include <windows.h>
29			#include <winuser.h>
30	ossman_	1069
31	ossman_	1073	#include "../vchannel.h"
32	ossman_	1071
33	ossman_	1069	#define DLL_EXPORT __declspec(dllexport)
34
35			// Shared DATA
36			#pragma data_seg ( "SHAREDDATA" )
37
38			// this is the total number of processes this dll is currently attached to
39	ossman_	1071	int g_instance_count = 0;
40	ossman_	1069
41			#pragma data_seg ()
42
43			#pragma comment(linker, "/section:SHAREDDATA,rws")
44
45	ossman_	1071	static HHOOK g_cbt_hook = NULL;
46			static HHOOK g_wndproc_hook = NULL;
47	ossman_	1134	static HHOOK g_wndprocret_hook = NULL;
48	ossman_	1069
49	ossman_	1071	static HINSTANCE g_instance = NULL;
50	ossman_	1069
51	ossman_	1071	static HANDLE g_mutex = NULL;
52	ossman_	1069
53	ossman_	1081	static void
54			update_position(HWND hwnd)
55			{
56			RECT rect;
57
58			if (!GetWindowRect(hwnd, &rect))
59			{
60			debug("GetWindowRect failed!\n");
61			return;
62			}
63
64	astrand	1091	vchannel_write("POSITION,0x%p,%d,%d,%d,%d,0x%x",
65	ossman_	1081	hwnd,
66			rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 0);
67			}
68
69	ossman_	1071	static LRESULT CALLBACK
70			wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
71	ossman_	1069	{
72	ossman_	1097	HWND hwnd, parent;
73	ossman_	1079	UINT msg;
74			WPARAM wparam;
75			LPARAM lparam;
76	ossman_	1069
77	ossman_	1079	LONG style;
78	ossman_	1069
79	ossman_	1071	if (code < 0)
80			goto end;
81	ossman_	1069
82	ossman_	1079	hwnd = ((CWPSTRUCT *) details)->hwnd;
83			msg = ((CWPSTRUCT *) details)->message;
84			wparam = ((CWPSTRUCT *) details)->wParam;
85			lparam = ((CWPSTRUCT *) details)->lParam;
86
87			style = GetWindowLong(hwnd, GWL_STYLE);
88
89	ossman_	1082	/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
90			but they exist nonetheless. */
91			if ((style & WS_CHILD) && !(style & WS_POPUP))
92	ossman_	1079	goto end;
93
94	ossman_	1097	if (style & WS_POPUP)
95	ossman_	1109	{
96	ossman_	1097	parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
97	ossman_	1109	if (!parent)
98			parent = (HWND) - 1;
99			}
100	ossman_	1097	else
101			parent = NULL;
102
103	ossman_	1071	switch (msg)
104			{
105	ossman_	1069
106	ossman_	1071	case WM_WINDOWPOSCHANGED:
107	ossman_	1079	{
108			WINDOWPOS wp = (WINDOWPOS ) lparam;
109	ossman_	1069
110	ossman_	1079	if (wp->flags & SWP_SHOWWINDOW)
111			{
112	ossman_	1134	unsigned short title[150];
113	ossman_	1099	int state;
114
115	ossman_	1097	vchannel_write("CREATE,0x%p,0x%p,0x%x", hwnd, parent, 0);
116	ossman_	1069
117	ossman_	1134	GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
118	ossman_	1069
119	ossman_	1113	vchannel_write("TITLE,0x%x,%s,0x%x", hwnd,
120	ossman_	1134	vchannel_strfilter_unicode(title), 0);
121	ossman_	1099
122			if (style & WS_MAXIMIZE)
123			state = 2;
124			else if (style & WS_MINIMIZE)
125			state = 1;
126			else
127			state = 0;
128
129	ossman_	1081	update_position(hwnd);
130	ossman_	1099
131	ossman_	1131	vchannel_write("STATE,0x%p,0x%x,0x%x", hwnd, state, 0);
132	ossman_	1079	}
133	ossman_	1069
134	ossman_	1079	if (wp->flags & SWP_HIDEWINDOW)
135	astrand	1091	vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
136	ossman_	1079
137	ossman_	1108	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
138	ossman_	1079	break;
139
140	ossman_	1080	if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
141	ossman_	1081	update_position(hwnd);
142	ossman_	1079
143			if (!(wp->flags & SWP_NOZORDER))
144	ossman_	1080	{
145	astrand	1091	vchannel_write("ZCHANGE,0x%p,0x%p,0x%x",
146	ossman_	1079	hwnd,
147			wp->flags & SWP_NOACTIVATE ? wp->
148			hwndInsertAfter : 0, 0);
149	ossman_	1080	}
150	ossman_	1069
151	ossman_	1071	break;
152	ossman_	1079	}
153	ossman_	1069
154	ossman_	1081	case WM_SIZE:
155	ossman_	1108	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
156	ossman_	1083	break;
157	ossman_	1081	update_position(hwnd);
158			break;
159
160			case WM_MOVE:
161	ossman_	1108	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
162	ossman_	1083	break;
163	ossman_	1081	update_position(hwnd);
164			break;
165
166	ossman_	1134	case WM_DESTROY:
167			if (!(style & WS_VISIBLE))
168			break;
169			vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
170			break;
171
172			default:
173			break;
174			}
175
176			end:
177			return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
178			}
179
180			static LRESULT CALLBACK
181			wndprocret_hook_proc(int code, WPARAM cur_thread, LPARAM details)
182			{
183			HWND hwnd, parent;
184			UINT msg;
185			WPARAM wparam;
186			LPARAM lparam;
187
188			LONG style;
189
190			if (code < 0)
191			goto end;
192
193			hwnd = ((CWPRETSTRUCT *) details)->hwnd;
194			msg = ((CWPRETSTRUCT *) details)->message;
195			wparam = ((CWPRETSTRUCT *) details)->wParam;
196			lparam = ((CWPRETSTRUCT *) details)->lParam;
197
198			style = GetWindowLong(hwnd, GWL_STYLE);
199
200			/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
201			but they exist nonetheless. */
202			if ((style & WS_CHILD) && !(style & WS_POPUP))
203			goto end;
204
205			switch (msg)
206			{
207	ossman_	1102	case WM_SETTEXT:
208	ossman_	1113	{
209	ossman_	1134	unsigned short title[150];
210	ossman_	1113	if (!(style & WS_VISIBLE))
211			break;
212	ossman_	1134	/* We cannot use the string in lparam because
213			we need unicode. */
214			GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
215	ossman_	1113	vchannel_write("TITLE,0x%p,%s,0x%x", hwnd,
216	ossman_	1134	vchannel_strfilter_unicode(title), 0);
217	ossman_	1102	break;
218	ossman_	1113	}
219	ossman_	1102
220	ossman_	1071	default:
221			break;
222			}
223
224			end:
225	ossman_	1134	return CallNextHookEx(g_wndprocret_hook, code, cur_thread, details);
226	ossman_	1069	}
227
228	ossman_	1071	static LRESULT CALLBACK
229			cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
230	ossman_	1069	{
231	ossman_	1071	if (code < 0)
232			goto end;
233	ossman_	1069
234	ossman_	1071	switch (code)
235			{
236			case HCBT_MINMAX:
237			{
238	ossman_	1079	int show, state;
239	ossman_	1069
240	ossman_	1071	show = LOWORD(lparam);
241	ossman_	1069
242	ossman_	1128	if ((show == SW_NORMAL) \|\| (show == SW_SHOWNORMAL)
243			\|\| (show == SW_RESTORE))
244	ossman_	1079	state = 0;
245	ossman_	1106	else if ((show == SW_MINIMIZE) \|\| (show == SW_SHOWMINIMIZED))
246	ossman_	1079	state = 1;
247	ossman_	1106	else if ((show == SW_MAXIMIZE) \|\| (show == SW_SHOWMAXIMIZED))
248	ossman_	1079	state = 2;
249	ossman_	1100	else
250	ossman_	1106	{
251			debug("Unexpected show: %d", show);
252	ossman_	1100	break;
253	ossman_	1106	}
254	ossman_	1096	vchannel_write("STATE,0x%p,0x%x,0x%x", (HWND) wparam, state, 0);
255	ossman_	1071	break;
256			}
257	ossman_	1069
258	ossman_	1071	default:
259			break;
260			}
261	ossman_	1069
262	ossman_	1071	end:
263			return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
264	ossman_	1069	}
265
266	ossman_	1071	DLL_EXPORT void
267			SetHooks(void)
268	ossman_	1069	{
269	ossman_	1071	if (!g_cbt_hook)
270			g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);
271	ossman_	1069
272	ossman_	1071	if (!g_wndproc_hook)
273			g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);
274	ossman_	1134
275			if (!g_wndprocret_hook)
276			g_wndprocret_hook =
277			SetWindowsHookEx(WH_CALLWNDPROCRET, wndprocret_hook_proc, g_instance, 0);
278	ossman_	1069	}
279
280	ossman_	1071	DLL_EXPORT void
281			RemoveHooks(void)
282	ossman_	1069	{
283	ossman_	1071	if (g_cbt_hook)
284			UnhookWindowsHookEx(g_cbt_hook);
285	ossman_	1069
286	ossman_	1071	if (g_wndproc_hook)
287			UnhookWindowsHookEx(g_wndproc_hook);
288	ossman_	1134
289			if (g_wndprocret_hook)
290			UnhookWindowsHookEx(g_wndprocret_hook);
291	ossman_	1069	}
292
293	ossman_	1071	DLL_EXPORT int
294			GetInstanceCount()
295	ossman_	1069	{
296	ossman_	1071	return g_instance_count;
297	ossman_	1069	}
298
299	ossman_	1071	BOOL APIENTRY
300			DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
301	ossman_	1069	{
302	ossman_	1071	switch (ul_reason_for_call)
303			{
304			case DLL_PROCESS_ATTACH:
305			// remember our instance handle
306			g_instance = hinstDLL;
307	ossman_	1069
308	ossman_	1073	g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
309	ossman_	1071	if (!g_mutex)
310			return FALSE;
311	ossman_	1069
312	ossman_	1071	WaitForSingleObject(g_mutex, INFINITE);
313			++g_instance_count;
314			ReleaseMutex(g_mutex);
315	ossman_	1069
316	ossman_	1071	vchannel_open();
317	ossman_	1069
318	ossman_	1071	break;
319	ossman_	1069
320	ossman_	1071	case DLL_THREAD_ATTACH:
321			break;
322	ossman_	1069
323	ossman_	1071	case DLL_THREAD_DETACH:
324			break;
325	ossman_	1069
326	ossman_	1071	case DLL_PROCESS_DETACH:
327			WaitForSingleObject(g_mutex, INFINITE);
328			--g_instance_count;
329			ReleaseMutex(g_mutex);
330	ossman_	1069
331	ossman_	1071	vchannel_close();
332	ossman_	1069
333	ossman_	1071	CloseHandle(g_mutex);
334	ossman_	1069
335	ossman_	1071	break;
336			}
337	ossman_	1069
338	ossman_	1071	return TRUE;
339	ossman_	1069	}