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 LRESULT CALLBACK
wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
{
        HWND hwnd = ((CWPSTRUCT *) details)->hwnd;
        UINT msg = ((CWPSTRUCT *) details)->message;
        WPARAM wparam = ((CWPSTRUCT *) details)->wParam;
        LPARAM lparam = ((CWPSTRUCT *) details)->lParam;

        LONG style = GetWindowLong(hwnd, GWL_STYLE);
        WINDOWPOS *wp = (WINDOWPOS *) lparam;
        RECT rect;

        if (code < 0)
                goto end;

        switch (msg)
        {

                case WM_WINDOWPOSCHANGED:
                        if (style & WS_CHILD)
                                break;


                        if (wp->flags & SWP_SHOWWINDOW)
                        {
                                // FIXME: Now, just like create!
                                debug("SWP_SHOWWINDOW for %p!", hwnd);
                                vchannel_write("CREATE1,0x%p,0x%x", hwnd, 0);

                                // FIXME: SETSTATE

                                if (!GetWindowRect(hwnd, &rect))
                                {
                                        debug("GetWindowRect failed!\n");
                                        break;
                                }
                                vchannel_write("POSITION1,0x%p,%d,%d,%d,%d,0x%x",
                                               hwnd,
                                               rect.left, rect.top,
                                               rect.right - rect.left, rect.bottom - rect.top, 0);
                        }


                        if (wp->flags & SWP_HIDEWINDOW)
                                vchannel_write("DESTROY1,0x%p,0x%x", hwnd, 0);


                        if (!(style & WS_VISIBLE))
                                break;

                        if (wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE)
                                break;

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

                        vchannel_write("POSITION1,0x%p,%d,%d,%d,%d,0x%x",
                                       hwnd,
                                       rect.left, rect.top,
                                       rect.right - rect.left, rect.bottom - rect.top, 0);

                        break;


                        /* Note: WM_WINDOWPOSCHANGING/WM_WINDOWPOSCHANGED are
                           strange. Sometimes, for example when bringing up the
                           Notepad About dialog, only an WM_WINDOWPOSCHANGING is
                           sent. In some other cases, for exmaple when opening
                           Format->Text in Notepad, both events are sent. Also, for
                           some reason, when closing the Notepad About dialog, an
                           WM_WINDOWPOSCHANGING event is sent which looks just like
                           the event that was sent when the About dialog was opened...  */
                case WM_WINDOWPOSCHANGING:
                        if (style & WS_CHILD)
                                break;

                        if (!(style & WS_VISIBLE))
                                break;

                        if (!(wp->flags & SWP_NOZORDER))
                                vchannel_write("ZCHANGE1,0x%p,0x%p,0x%x",
                                               hwnd,
                                               wp->flags & SWP_NOACTIVATE ? wp->hwndInsertAfter : 0,
                                               0);

                        break;


                case WM_DESTROY:
                        if (style & WS_CHILD)
                                break;

                        vchannel_write("DESTROY1,0x%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)
{
        char title[150];

        if (code < 0)
                goto end;

        switch (code)
        {
                case HCBT_MINMAX:
                        {
                                int show;

                                show = LOWORD(lparam);

                                if ((show == SW_SHOWMINIMIZED) || (show == SW_MINIMIZE))
                                {
                                        MessageBox(0,
                                                   "Minimizing windows is not allowed in this version. Sorry!",
                                                   "SeamlessRDP", MB_OK);
                                        return 1;
                                }

                                GetWindowText((HWND) wparam, title, sizeof(title));

                                /* FIXME: Strip title of dangerous characters */

                                vchannel_write("SETSTATE1,0x%p,%s,0x%x,0x%x",
                                               (HWND) wparam, title, show, 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	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_	1069
48	ossman_	1071	static HINSTANCE g_instance = NULL;
49	ossman_	1069
50	ossman_	1071	static HANDLE g_mutex = NULL;
51	ossman_	1069
52	ossman_	1071	static LRESULT CALLBACK
53			wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
54	ossman_	1069	{
55	ossman_	1071	HWND hwnd = ((CWPSTRUCT *) details)->hwnd;
56			UINT msg = ((CWPSTRUCT *) details)->message;
57			WPARAM wparam = ((CWPSTRUCT *) details)->wParam;
58			LPARAM lparam = ((CWPSTRUCT *) details)->lParam;
59	ossman_	1069
60	ossman_	1071	LONG style = GetWindowLong(hwnd, GWL_STYLE);
61			WINDOWPOS wp = (WINDOWPOS ) lparam;
62			RECT rect;
63	ossman_	1069
64	ossman_	1071	if (code < 0)
65			goto end;
66	ossman_	1069
67	ossman_	1071	switch (msg)
68			{
69	ossman_	1069
70	ossman_	1071	case WM_WINDOWPOSCHANGED:
71			if (style & WS_CHILD)
72			break;
73	ossman_	1069
74
75	ossman_	1071	if (wp->flags & SWP_SHOWWINDOW)
76			{
77			// FIXME: Now, just like create!
78			debug("SWP_SHOWWINDOW for %p!", hwnd);
79			vchannel_write("CREATE1,0x%p,0x%x", hwnd, 0);
80	ossman_	1069
81	ossman_	1071	// FIXME: SETSTATE
82	ossman_	1069
83	ossman_	1071	if (!GetWindowRect(hwnd, &rect))
84			{
85			debug("GetWindowRect failed!\n");
86			break;
87			}
88			vchannel_write("POSITION1,0x%p,%d,%d,%d,%d,0x%x",
89			hwnd,
90			rect.left, rect.top,
91			rect.right - rect.left, rect.bottom - rect.top, 0);
92			}
93	ossman_	1069
94
95	ossman_	1071	if (wp->flags & SWP_HIDEWINDOW)
96			vchannel_write("DESTROY1,0x%p,0x%x", hwnd, 0);
97	ossman_	1069
98
99	ossman_	1071	if (!(style & WS_VISIBLE))
100			break;
101	ossman_	1069
102	ossman_	1071	if (wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE)
103			break;
104	ossman_	1069
105	ossman_	1071	if (!GetWindowRect(hwnd, &rect))
106			{
107			debug("GetWindowRect failed!\n");
108			break;
109			}
110	ossman_	1069
111	ossman_	1071	vchannel_write("POSITION1,0x%p,%d,%d,%d,%d,0x%x",
112			hwnd,
113			rect.left, rect.top,
114			rect.right - rect.left, rect.bottom - rect.top, 0);
115	ossman_	1069
116	ossman_	1071	break;
117	ossman_	1069
118
119	ossman_	1071	/* Note: WM_WINDOWPOSCHANGING/WM_WINDOWPOSCHANGED are
120			strange. Sometimes, for example when bringing up the
121			Notepad About dialog, only an WM_WINDOWPOSCHANGING is
122			sent. In some other cases, for exmaple when opening
123			Format->Text in Notepad, both events are sent. Also, for
124			some reason, when closing the Notepad About dialog, an
125			WM_WINDOWPOSCHANGING event is sent which looks just like
126			the event that was sent when the About dialog was opened... */
127			case WM_WINDOWPOSCHANGING:
128			if (style & WS_CHILD)
129			break;
130	ossman_	1069
131	ossman_	1071	if (!(style & WS_VISIBLE))
132			break;
133	ossman_	1069
134	ossman_	1071	if (!(wp->flags & SWP_NOZORDER))
135			vchannel_write("ZCHANGE1,0x%p,0x%p,0x%x",
136			hwnd,
137			wp->flags & SWP_NOACTIVATE ? wp->hwndInsertAfter : 0,
138			0);
139	ossman_	1069
140	ossman_	1071	break;
141	ossman_	1069
142
143
144
145	ossman_	1071	case WM_DESTROY:
146			if (style & WS_CHILD)
147			break;
148	ossman_	1069
149	ossman_	1071	vchannel_write("DESTROY1,0x%p,0x%x", hwnd, 0);
150	ossman_	1069
151	ossman_	1071	break;
152	ossman_	1069
153
154	ossman_	1071	default:
155			break;
156			}
157
158			end:
159			return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
160	ossman_	1069	}
161
162	ossman_	1071	static LRESULT CALLBACK
163			cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
164	ossman_	1069	{
165	ossman_	1071	char title[150];
166	ossman_	1069
167	ossman_	1071	if (code < 0)
168			goto end;
169	ossman_	1069
170	ossman_	1071	switch (code)
171			{
172			case HCBT_MINMAX:
173			{
174			int show;
175	ossman_	1069
176	ossman_	1071	show = LOWORD(lparam);
177	ossman_	1069
178	ossman_	1071	if ((show == SW_SHOWMINIMIZED) \|\| (show == SW_MINIMIZE))
179			{
180			MessageBox(0,
181			"Minimizing windows is not allowed in this version. Sorry!",
182			"SeamlessRDP", MB_OK);
183			return 1;
184			}
185	ossman_	1069
186	ossman_	1071	GetWindowText((HWND) wparam, title, sizeof(title));
187	ossman_	1069
188	ossman_	1071	/* FIXME: Strip title of dangerous characters */
189	ossman_	1069
190	ossman_	1071	vchannel_write("SETSTATE1,0x%p,%s,0x%x,0x%x",
191			(HWND) wparam, title, show, 0);
192			break;
193			}
194	ossman_	1069
195	ossman_	1071	default:
196			break;
197			}
198	ossman_	1069
199	ossman_	1071	end:
200			return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
201	ossman_	1069	}
202
203	ossman_	1071	DLL_EXPORT void
204			SetHooks(void)
205	ossman_	1069	{
206	ossman_	1071	if (!g_cbt_hook)
207			g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);
208	ossman_	1069
209	ossman_	1071	if (!g_wndproc_hook)
210			g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);
211	ossman_	1069	}
212
213	ossman_	1071	DLL_EXPORT void
214			RemoveHooks(void)
215	ossman_	1069	{
216	ossman_	1071	if (g_cbt_hook)
217			UnhookWindowsHookEx(g_cbt_hook);
218	ossman_	1069
219	ossman_	1071	if (g_wndproc_hook)
220			UnhookWindowsHookEx(g_wndproc_hook);
221	ossman_	1069	}
222
223	ossman_	1071	DLL_EXPORT int
224			GetInstanceCount()
225	ossman_	1069	{
226	ossman_	1071	return g_instance_count;
227	ossman_	1069	}
228
229	ossman_	1071	BOOL APIENTRY
230			DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
231	ossman_	1069	{
232	ossman_	1071	switch (ul_reason_for_call)
233			{
234			case DLL_PROCESS_ATTACH:
235			// remember our instance handle
236			g_instance = hinstDLL;
237	ossman_	1069
238	ossman_	1073	g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
239	ossman_	1071	if (!g_mutex)
240			return FALSE;
241	ossman_	1069
242	ossman_	1071	WaitForSingleObject(g_mutex, INFINITE);
243			++g_instance_count;
244			ReleaseMutex(g_mutex);
245	ossman_	1069
246	ossman_	1071	vchannel_open();
247	ossman_	1069
248	ossman_	1071	break;
249	ossman_	1069
250	ossman_	1071	case DLL_THREAD_ATTACH:
251			break;
252	ossman_	1069
253	ossman_	1071	case DLL_THREAD_DETACH:
254			break;
255	ossman_	1069
256	ossman_	1071	case DLL_PROCESS_DETACH:
257			WaitForSingleObject(g_mutex, INFINITE);
258			--g_instance_count;
259			ReleaseMutex(g_mutex);
260	ossman_	1069
261	ossman_	1071	vchannel_close();
262	ossman_	1069
263	ossman_	1071	CloseHandle(g_mutex);
264	ossman_	1069
265	ossman_	1071	break;
266			}
267	ossman_	1069
268	ossman_	1071	return TRUE;
269	ossman_	1069	}