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 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)
                                {
                                        char title[150];
                                        int state;

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

                                        GetWindowText(hwnd, title, sizeof(title));

                                        /* FIXME: Strip title of dangerous characters */

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

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

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

                                        update_position(hwnd);

                                        /* FIXME: Figure out z order */
                                }

                                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_SETTEXT:
                        if (!(style & WS_VISIBLE))
                                break;
                        /* FIXME: Strip title of dangerous characters */
                        vchannel_write("TITLE,0x%p,%s,0x%x", hwnd, (char *) lparam, 0);
                        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
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))
                                        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);
}

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

        if (g_wndproc_hook)
                UnhookWindowsHookEx(g_wndproc_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	/* -- 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	// Shared DATA
36	#pragma data_seg ( "SHAREDDATA" )
37
38	// this is the total number of processes this dll is currently attached to
39	int g_instance_count = 0;
40
41	#pragma data_seg ()
42
43	#pragma comment(linker, "/section:SHAREDDATA,rws")
44
45	static HHOOK g_cbt_hook = NULL;
46	static HHOOK g_wndproc_hook = NULL;
47
48	static HINSTANCE g_instance = NULL;
49
50	static HANDLE g_mutex = NULL;
51
52	static void
53	update_position(HWND hwnd)
54	{
55	RECT rect;
56
57	if (!GetWindowRect(hwnd, &rect))
58	{
59	debug("GetWindowRect failed!\n");
60	return;
61	}
62
63	vchannel_write("POSITION,0x%p,%d,%d,%d,%d,0x%x",
64	hwnd,
65	rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 0);
66	}
67
68	static LRESULT CALLBACK
69	wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
70	{
71	HWND hwnd, parent;
72	UINT msg;
73	WPARAM wparam;
74	LPARAM lparam;
75
76	LONG style;
77
78	if (code < 0)
79	goto end;
80
81	hwnd = ((CWPSTRUCT *) details)->hwnd;
82	msg = ((CWPSTRUCT *) details)->message;
83	wparam = ((CWPSTRUCT *) details)->wParam;
84	lparam = ((CWPSTRUCT *) details)->lParam;
85
86	style = GetWindowLong(hwnd, GWL_STYLE);
87
88	/* Docs say that WS_CHILD and WS_POPUP is an illegal combination,
89	but they exist nonetheless. */
90	if ((style & WS_CHILD) && !(style & WS_POPUP))
91	goto end;
92
93	if (style & WS_POPUP)
94	{
95	parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
96	if (!parent)
97	parent = (HWND) - 1;
98	}
99	else
100	parent = NULL;
101
102	switch (msg)
103	{
104
105	case WM_WINDOWPOSCHANGED:
106	{
107	WINDOWPOS wp = (WINDOWPOS ) lparam;
108
109	if (wp->flags & SWP_SHOWWINDOW)
110	{
111	char title[150];
112	int state;
113
114	vchannel_write("CREATE,0x%p,0x%p,0x%x", hwnd, parent, 0);
115
116	GetWindowText(hwnd, title, sizeof(title));
117
118	/* FIXME: Strip title of dangerous characters */
119
120	vchannel_write("TITLE,0x%x,%s,0x%x", hwnd, title, 0);
121
122	if (style & WS_MAXIMIZE)
123	state = 2;
124	else if (style & WS_MINIMIZE)
125	state = 1;
126	else
127	state = 0;
128
129	vchannel_write("STATE,0x%p,0x%x,0x%x", hwnd, state, 0);
130
131	update_position(hwnd);
132
133	/* FIXME: Figure out z order */
134	}
135
136	if (wp->flags & SWP_HIDEWINDOW)
137	vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
138
139	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
140	break;
141
142	if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
143	update_position(hwnd);
144
145	if (!(wp->flags & SWP_NOZORDER))
146	{
147	vchannel_write("ZCHANGE,0x%p,0x%p,0x%x",
148	hwnd,
149	wp->flags & SWP_NOACTIVATE ? wp->
150	hwndInsertAfter : 0, 0);
151	}
152
153	break;
154	}
155
156	case WM_SIZE:
157	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
158	break;
159	update_position(hwnd);
160	break;
161
162	case WM_MOVE:
163	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
164	break;
165	update_position(hwnd);
166	break;
167
168	case WM_SETTEXT:
169	if (!(style & WS_VISIBLE))
170	break;
171	/* FIXME: Strip title of dangerous characters */
172	vchannel_write("TITLE,0x%p,%s,0x%x", hwnd, (char *) lparam, 0);
173	break;
174
175	case WM_DESTROY:
176	if (!(style & WS_VISIBLE))
177	break;
178	vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
179	break;
180
181	default:
182	break;
183	}
184
185	end:
186	return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
187	}
188
189	static LRESULT CALLBACK
190	cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
191	{
192	if (code < 0)
193	goto end;
194
195	switch (code)
196	{
197	case HCBT_MINMAX:
198	{
199	int show, state;
200
201	show = LOWORD(lparam);
202
203	if ((show == SW_NORMAL) \|\| (show == SW_SHOWNORMAL))
204	state = 0;
205	else if ((show == SW_MINIMIZE) \|\| (show == SW_SHOWMINIMIZED))
206	state = 1;
207	else if ((show == SW_MAXIMIZE) \|\| (show == SW_SHOWMAXIMIZED))
208	state = 2;
209	else
210	{
211	debug("Unexpected show: %d", show);
212	break;
213	}
214	vchannel_write("STATE,0x%p,0x%x,0x%x", (HWND) wparam, state, 0);
215	break;
216	}
217
218	default:
219	break;
220	}
221
222	end:
223	return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
224	}
225
226	DLL_EXPORT void
227	SetHooks(void)
228	{
229	if (!g_cbt_hook)
230	g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);
231
232	if (!g_wndproc_hook)
233	g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);
234	}
235
236	DLL_EXPORT void
237	RemoveHooks(void)
238	{
239	if (g_cbt_hook)
240	UnhookWindowsHookEx(g_cbt_hook);
241
242	if (g_wndproc_hook)
243	UnhookWindowsHookEx(g_wndproc_hook);
244	}
245
246	DLL_EXPORT int
247	GetInstanceCount()
248	{
249	return g_instance_count;
250	}
251
252	BOOL APIENTRY
253	DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
254	{
255	switch (ul_reason_for_call)
256	{
257	case DLL_PROCESS_ATTACH:
258	// remember our instance handle
259	g_instance = hinstDLL;
260
261	g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
262	if (!g_mutex)
263	return FALSE;
264
265	WaitForSingleObject(g_mutex, INFINITE);
266	++g_instance_count;
267	ReleaseMutex(g_mutex);
268
269	vchannel_open();
270
271	break;
272
273	case DLL_THREAD_ATTACH:
274	break;
275
276	case DLL_THREAD_DETACH:
277	break;
278
279	case DLL_PROCESS_DETACH:
280	WaitForSingleObject(g_mutex, INFINITE);
281	--g_instance_count;
282	ReleaseMutex(g_mutex);
283
284	vchannel_close();
285
286	CloseHandle(g_mutex);
287
288	break;
289	}
290
291	return TRUE;
292	}