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;
        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;

        switch (msg)
        {

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

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

                                        // FIXME: SETSTATE

                                        update_position(hwnd);
                                }

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

                                if (!(style & WS_VISIBLE))
                                        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))
                                break;
                        update_position(hwnd);
                        break;

                case WM_MOVE:
                        if (!(style & WS_VISIBLE))
                                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
cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
{
        char title[150];

        if (code < 0)
                goto end;

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

                                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 */

                                if (show == SW_SHOWNORMAL)
                                        state = 0;
                                else if (show == SW_SHOWMINIMIZED)
                                        state = 1;
                                else if (show == SW_SHOWMAXIMIZED)
                                        state = 2;
                                vchannel_write("SETSTATE,0x%p,%s,0x%x,0x%x",
                                               (HWND) wparam, title, 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	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_	1081	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	astrand	1091	vchannel_write("POSITION,0x%p,%d,%d,%d,%d,0x%x",
64	ossman_	1081	hwnd,
65			rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 0);
66			}
67
68	ossman_	1071	static LRESULT CALLBACK
69			wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details)
70	ossman_	1069	{
71	ossman_	1079	HWND hwnd;
72			UINT msg;
73			WPARAM wparam;
74			LPARAM lparam;
75	ossman_	1069
76	ossman_	1079	LONG style;
77	ossman_	1069
78	ossman_	1071	if (code < 0)
79			goto end;
80	ossman_	1069
81	ossman_	1079	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	ossman_	1082	/* 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	ossman_	1079	goto end;
92
93	ossman_	1071	switch (msg)
94			{
95	ossman_	1069
96	ossman_	1071	case WM_WINDOWPOSCHANGED:
97	ossman_	1079	{
98			WINDOWPOS wp = (WINDOWPOS ) lparam;
99	ossman_	1069
100	ossman_	1079	if (wp->flags & SWP_SHOWWINDOW)
101			{
102			// FIXME: Now, just like create!
103			debug("SWP_SHOWWINDOW for %p!", hwnd);
104	astrand	1091	vchannel_write("CREATE,0x%p,0x%x", hwnd, 0);
105	ossman_	1069
106	ossman_	1079	// FIXME: SETSTATE
107	ossman_	1069
108	ossman_	1081	update_position(hwnd);
109	ossman_	1079	}
110	ossman_	1069
111	ossman_	1079	if (wp->flags & SWP_HIDEWINDOW)
112	astrand	1091	vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
113	ossman_	1079
114			if (!(style & WS_VISIBLE))
115			break;
116
117	ossman_	1080	if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
118	ossman_	1081	update_position(hwnd);
119	ossman_	1079
120			if (!(wp->flags & SWP_NOZORDER))
121	ossman_	1080	{
122	astrand	1091	vchannel_write("ZCHANGE,0x%p,0x%p,0x%x",
123	ossman_	1079	hwnd,
124			wp->flags & SWP_NOACTIVATE ? wp->
125			hwndInsertAfter : 0, 0);
126	ossman_	1080	}
127	ossman_	1069
128	ossman_	1071	break;
129	ossman_	1079	}
130	ossman_	1069
131	ossman_	1081	case WM_SIZE:
132	ossman_	1083	if (!(style & WS_VISIBLE))
133			break;
134	ossman_	1081	update_position(hwnd);
135			break;
136
137			case WM_MOVE:
138	ossman_	1083	if (!(style & WS_VISIBLE))
139			break;
140	ossman_	1081	update_position(hwnd);
141			break;
142
143	ossman_	1071	case WM_DESTROY:
144	ossman_	1083	if (!(style & WS_VISIBLE))
145			break;
146	astrand	1091	vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
147	ossman_	1071	break;
148	ossman_	1069
149	ossman_	1071	default:
150			break;
151			}
152
153			end:
154			return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
155	ossman_	1069	}
156
157	ossman_	1071	static LRESULT CALLBACK
158			cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
159	ossman_	1069	{
160	ossman_	1071	char title[150];
161	ossman_	1069
162	ossman_	1071	if (code < 0)
163			goto end;
164	ossman_	1069
165	ossman_	1071	switch (code)
166			{
167			case HCBT_MINMAX:
168			{
169	ossman_	1079	int show, state;
170	ossman_	1069
171	ossman_	1071	show = LOWORD(lparam);
172	ossman_	1069
173	ossman_	1071	if ((show == SW_SHOWMINIMIZED) \|\| (show == SW_MINIMIZE))
174			{
175			MessageBox(0,
176			"Minimizing windows is not allowed in this version. Sorry!",
177			"SeamlessRDP", MB_OK);
178			return 1;
179			}
180	ossman_	1069
181	ossman_	1071	GetWindowText((HWND) wparam, title, sizeof(title));
182	ossman_	1069
183	ossman_	1071	/* FIXME: Strip title of dangerous characters */
184	ossman_	1069
185	ossman_	1079	if (show == SW_SHOWNORMAL)
186			state = 0;
187			else if (show == SW_SHOWMINIMIZED)
188			state = 1;
189			else if (show == SW_SHOWMAXIMIZED)
190			state = 2;
191	astrand	1091	vchannel_write("SETSTATE,0x%p,%s,0x%x,0x%x",
192	ossman_	1079	(HWND) wparam, title, state, 0);
193	ossman_	1071	break;
194			}
195	ossman_	1069
196	ossman_	1071	default:
197			break;
198			}
199	ossman_	1069
200	ossman_	1071	end:
201			return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
202	ossman_	1069	}
203
204	ossman_	1071	DLL_EXPORT void
205			SetHooks(void)
206	ossman_	1069	{
207	ossman_	1071	if (!g_cbt_hook)
208			g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);
209	ossman_	1069
210	ossman_	1071	if (!g_wndproc_hook)
211			g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);
212	ossman_	1069	}
213
214	ossman_	1071	DLL_EXPORT void
215			RemoveHooks(void)
216	ossman_	1069	{
217	ossman_	1071	if (g_cbt_hook)
218			UnhookWindowsHookEx(g_cbt_hook);
219	ossman_	1069
220	ossman_	1071	if (g_wndproc_hook)
221			UnhookWindowsHookEx(g_wndproc_hook);
222	ossman_	1069	}
223
224	ossman_	1071	DLL_EXPORT int
225			GetInstanceCount()
226	ossman_	1069	{
227	ossman_	1071	return g_instance_count;
228	ossman_	1069	}
229
230	ossman_	1071	BOOL APIENTRY
231			DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
232	ossman_	1069	{
233	ossman_	1071	switch (ul_reason_for_call)
234			{
235			case DLL_PROCESS_ATTACH:
236			// remember our instance handle
237			g_instance = hinstDLL;
238	ossman_	1069
239	ossman_	1073	g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
240	ossman_	1071	if (!g_mutex)
241			return FALSE;
242	ossman_	1069
243	ossman_	1071	WaitForSingleObject(g_mutex, INFINITE);
244			++g_instance_count;
245			ReleaseMutex(g_mutex);
246	ossman_	1069
247	ossman_	1071	vchannel_open();
248	ossman_	1069
249	ossman_	1071	break;
250	ossman_	1069
251	ossman_	1071	case DLL_THREAD_ATTACH:
252			break;
253	ossman_	1069
254	ossman_	1071	case DLL_THREAD_DETACH:
255			break;
256	ossman_	1069
257	ossman_	1071	case DLL_PROCESS_DETACH:
258			WaitForSingleObject(g_mutex, INFINITE);
259			--g_instance_count;
260			ReleaseMutex(g_mutex);
261	ossman_	1069
262	ossman_	1071	vchannel_close();
263	ossman_	1069
264	ossman_	1071	CloseHandle(g_mutex);
265	ossman_	1069
266	ossman_	1071	break;
267			}
268	ossman_	1069
269	ossman_	1071	return TRUE;
270	ossman_	1069	}