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));

                                        vchannel_write("TITLE,0x%x,%s,0x%x", hwnd,
                                                       vchannel_strfilter(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_SETTEXT:
                        {
                                char *title;
                                if (!(style & WS_VISIBLE))
                                        break;
                                title = _strdup((char *) lparam);
                                vchannel_write("TITLE,0x%p,%s,0x%x", hwnd,
                                               vchannel_strfilter(title), 0);
                                free(title);
                                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)
                                    || (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);
}

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	vchannel_write("TITLE,0x%x,%s,0x%x", hwnd,
119	vchannel_strfilter(title), 0);
120
121	if (style & WS_MAXIMIZE)
122	state = 2;
123	else if (style & WS_MINIMIZE)
124	state = 1;
125	else
126	state = 0;
127
128	update_position(hwnd);
129
130	vchannel_write("STATE,0x%p,0x%x,0x%x", hwnd, state, 0);
131	}
132
133	if (wp->flags & SWP_HIDEWINDOW)
134	vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
135
136	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
137	break;
138
139	if (!(wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE))
140	update_position(hwnd);
141
142	if (!(wp->flags & SWP_NOZORDER))
143	{
144	vchannel_write("ZCHANGE,0x%p,0x%p,0x%x",
145	hwnd,
146	wp->flags & SWP_NOACTIVATE ? wp->
147	hwndInsertAfter : 0, 0);
148	}
149
150	break;
151	}
152
153	case WM_SIZE:
154	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
155	break;
156	update_position(hwnd);
157	break;
158
159	case WM_MOVE:
160	if (!(style & WS_VISIBLE) \|\| (style & WS_MINIMIZE))
161	break;
162	update_position(hwnd);
163	break;
164
165	case WM_SETTEXT:
166	{
167	char *title;
168	if (!(style & WS_VISIBLE))
169	break;
170	title = _strdup((char *) lparam);
171	vchannel_write("TITLE,0x%p,%s,0x%x", hwnd,
172	vchannel_strfilter(title), 0);
173	free(title);
174	break;
175	}
176
177	case WM_DESTROY:
178	if (!(style & WS_VISIBLE))
179	break;
180	vchannel_write("DESTROY,0x%p,0x%x", hwnd, 0);
181	break;
182
183	default:
184	break;
185	}
186
187	end:
188	return CallNextHookEx(g_wndproc_hook, code, cur_thread, details);
189	}
190
191	static LRESULT CALLBACK
192	cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam)
193	{
194	if (code < 0)
195	goto end;
196
197	switch (code)
198	{
199	case HCBT_MINMAX:
200	{
201	int show, state;
202
203	show = LOWORD(lparam);
204
205	if ((show == SW_NORMAL) \|\| (show == SW_SHOWNORMAL)
206	\|\| (show == SW_RESTORE))
207	state = 0;
208	else if ((show == SW_MINIMIZE) \|\| (show == SW_SHOWMINIMIZED))
209	state = 1;
210	else if ((show == SW_MAXIMIZE) \|\| (show == SW_SHOWMAXIMIZED))
211	state = 2;
212	else
213	{
214	debug("Unexpected show: %d", show);
215	break;
216	}
217	vchannel_write("STATE,0x%p,0x%x,0x%x", (HWND) wparam, state, 0);
218	break;
219	}
220
221	default:
222	break;
223	}
224
225	end:
226	return CallNextHookEx(g_cbt_hook, code, wparam, lparam);
227	}
228
229	DLL_EXPORT void
230	SetHooks(void)
231	{
232	if (!g_cbt_hook)
233	g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0);
234
235	if (!g_wndproc_hook)
236	g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0);
237	}
238
239	DLL_EXPORT void
240	RemoveHooks(void)
241	{
242	if (g_cbt_hook)
243	UnhookWindowsHookEx(g_cbt_hook);
244
245	if (g_wndproc_hook)
246	UnhookWindowsHookEx(g_wndproc_hook);
247	}
248
249	DLL_EXPORT int
250	GetInstanceCount()
251	{
252	return g_instance_count;
253	}
254
255	BOOL APIENTRY
256	DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved)
257	{
258	switch (ul_reason_for_call)
259	{
260	case DLL_PROCESS_ATTACH:
261	// remember our instance handle
262	g_instance = hinstDLL;
263
264	g_mutex = CreateMutex(NULL, FALSE, "Local\\SeamlessDLL");
265	if (!g_mutex)
266	return FALSE;
267
268	WaitForSingleObject(g_mutex, INFINITE);
269	++g_instance_count;
270	ReleaseMutex(g_mutex);
271
272	vchannel_open();
273
274	break;
275
276	case DLL_THREAD_ATTACH:
277	break;
278
279	case DLL_THREAD_DETACH:
280	break;
281
282	case DLL_PROCESS_DETACH:
283	WaitForSingleObject(g_mutex, INFINITE);
284	--g_instance_count;
285	ReleaseMutex(g_mutex);
286
287	vchannel_close();
288
289	CloseHandle(g_mutex);
290
291	break;
292	}
293
294	return TRUE;
295	}