seamlessrdp/ServerExe/main.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Seamless windows - Remote server executable

   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 <windows.h>
#include <stdio.h>
#include <wtsapi32.h>
#include <cchannel.h>

#include "vchannel.h"

#include "resource.h"

#define APP_NAME "SeamlessRDP Shell"

#ifndef WM_WTSSESSION_CHANGE
#define WM_WTSSESSION_CHANGE 0x02B1
#endif
#ifndef WTS_REMOTE_CONNECT
#define WTS_REMOTE_CONNECT 0x3
#endif

/* Global data */
static HINSTANCE g_instance;
static HWND g_hwnd;

typedef void (*set_hooks_proc_t) ();
typedef void (*remove_hooks_proc_t) ();
typedef int (*get_instance_count_proc_t) ();

typedef void (*move_window_proc_t) (HWND hwnd, int x, int y, int width, int height);
typedef void (*zchange_proc_t) (HWND hwnd, HWND behind);
typedef void (*focus_proc_t) (HWND hwnd);
typedef void (*set_state_proc_t) (HWND hwnd, int state);

static move_window_proc_t g_move_window_fn = NULL;
static zchange_proc_t g_zchange_fn = NULL;
static focus_proc_t g_focus_fn = NULL;
static set_state_proc_t g_set_state_fn = NULL;

static void
message(const char *text)
{
        MessageBox(GetDesktopWindow(), text, "SeamlessRDP Shell", MB_OK);
}

static char *
get_token(char **s)
{
        char *comma, *head;
        head = *s;

        if (!head)
                return NULL;

        comma = strchr(head, ',');
        if (comma)
        {
                *comma = '\0';
                *s = comma + 1;
        }
        else
        {
                *s = NULL;
        }

        return head;
}

static BOOL CALLBACK
enum_cb(HWND hwnd, LPARAM lparam)
{
        RECT rect;
        unsigned short title[150];
        LONG styles;
        int state;
        HWND parent;

        styles = GetWindowLong(hwnd, GWL_STYLE);

        if (!(styles & WS_VISIBLE))
                return TRUE;

        if (styles & WS_POPUP)
                parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
        else
                parent = NULL;

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

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

        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);

        GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));

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

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

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

        return TRUE;
}

static void
do_sync(void)
{
        vchannel_block();

        vchannel_write("SYNCBEGIN", "0x0");

        EnumWindows(enum_cb, 0);

        vchannel_write("SYNCEND", "0x0");

        vchannel_unblock();
}

static void
do_state(unsigned int serial, HWND hwnd, int state)
{
        g_set_state_fn(hwnd, state);
}

static void
do_position(unsigned int serial, HWND hwnd, int x, int y, int width, int height)
{
        g_move_window_fn(hwnd, x, y, width, height);
}

static void
do_zchange(unsigned int serial, HWND hwnd, HWND behind)
{
        g_zchange_fn(hwnd, behind);
}

static void
do_focus(unsigned int serial, HWND hwnd)
{
        g_focus_fn(hwnd);
}

static void
process_cmds(void)
{
        char line[VCHANNEL_MAX_LINE];
        int size;

        char *p, *tok1, *tok2, *tok3, *tok4, *tok5, *tok6, *tok7, *tok8;

        while ((size = vchannel_read(line, sizeof(line))) >= 0)
        {
                p = line;

                tok1 = get_token(&p);
                tok2 = get_token(&p);
                tok3 = get_token(&p);
                tok4 = get_token(&p);
                tok5 = get_token(&p);
                tok6 = get_token(&p);
                tok7 = get_token(&p);
                tok8 = get_token(&p);

                if (strcmp(tok1, "SYNC") == 0)
                        do_sync();
                else if (strcmp(tok1, "STATE") == 0)
                        do_state(strtoul(tok2, NULL, 0), (HWND) strtoul(tok3, NULL, 0),
                                 strtol(tok4, NULL, 0));
                else if (strcmp(tok1, "POSITION") == 0)
                        do_position(strtoul(tok2, NULL, 0), (HWND) strtoul(tok3, NULL, 0),
                                    strtol(tok4, NULL, 0), strtol(tok5, NULL, 0), strtol(tok6, NULL,
                                                                                         0),
                                    strtol(tok7, NULL, 0));
                else if (strcmp(tok1, "ZCHANGE") == 0)
                        do_zchange(strtoul(tok2, NULL, 0), (HWND) strtoul(tok3, NULL, 0),
                                   (HWND) strtoul(tok4, NULL, 0));
                else if (strcmp(tok1, "FOCUS") == 0)
                        do_focus(strtoul(tok2, NULL, 0), (HWND) strtoul(tok3, NULL, 0));
        }
}

static LRESULT CALLBACK
wndproc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
{
        if (message == WM_WTSSESSION_CHANGE)
        {
                if (wparam == WTS_REMOTE_CONNECT)
                {
                        /* These get reset on each reconnect */
                        SystemParametersInfo(SPI_SETDRAGFULLWINDOWS, TRUE, NULL, 0);
                        SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, FALSE, NULL, 0);
                        vchannel_write("HELLO", "0x%08x", 1);
                }
        }

        return DefWindowProc(hwnd, message, wparam, lparam);
}

static BOOL
register_class(void)
{
        WNDCLASSEX wcx;

        memset(&wcx, 0, sizeof(wcx));

        wcx.cbSize = sizeof(wcx);
        wcx.lpfnWndProc = wndproc;
        wcx.hInstance = g_instance;
        wcx.lpszClassName = "SeamlessClass";

        return RegisterClassEx(&wcx);
}

static BOOL
create_wnd(void)
{
        if (!register_class())
                return FALSE;

        g_hwnd = CreateWindow("SeamlessClass",
                              "Seamless Window",
                              WS_OVERLAPPEDWINDOW,
                              CW_USEDEFAULT,
                              CW_USEDEFAULT,
                              CW_USEDEFAULT,
                              CW_USEDEFAULT, (HWND) NULL, (HMENU) NULL, g_instance, (LPVOID) NULL);

        if (!g_hwnd)
                return FALSE;

        return TRUE;
}

int WINAPI
WinMain(HINSTANCE instance, HINSTANCE prev_instance, LPSTR cmdline, int cmdshow)
{
        HMODULE hookdll;

        set_hooks_proc_t set_hooks_fn;
        remove_hooks_proc_t remove_hooks_fn;
        get_instance_count_proc_t instance_count_fn;

        g_instance = instance;

        hookdll = LoadLibrary("seamlessrdp.dll");
        if (!hookdll)
        {
                message("Could not load hook DLL. Unable to continue.");
                return -1;
        }

        set_hooks_fn = (set_hooks_proc_t) GetProcAddress(hookdll, "SetHooks");
        remove_hooks_fn = (remove_hooks_proc_t) GetProcAddress(hookdll, "RemoveHooks");
        instance_count_fn = (get_instance_count_proc_t) GetProcAddress(hookdll, "GetInstanceCount");
        g_move_window_fn = (move_window_proc_t) GetProcAddress(hookdll, "SafeMoveWindow");
        g_zchange_fn = (zchange_proc_t) GetProcAddress(hookdll, "SafeZChange");
        g_focus_fn = (focus_proc_t) GetProcAddress(hookdll, "SafeFocus");
        g_set_state_fn = (set_state_proc_t) GetProcAddress(hookdll, "SafeSetState");

        if (!set_hooks_fn || !remove_hooks_fn || !instance_count_fn || !g_move_window_fn
            || !g_zchange_fn || !g_focus_fn || !g_set_state_fn)
        {
                FreeLibrary(hookdll);
                message("Hook DLL doesn't contain the correct functions. Unable to continue.");
                return -1;
        }

        /* Check if the DLL is already loaded */
        if (instance_count_fn() != 1)
        {
                FreeLibrary(hookdll);
                message("Another running instance of Seamless RDP detected.");
                return -1;
        }

        if (!create_wnd())
        {
                FreeLibrary(hookdll);
                message("Couldn't create a window to catch events.");
                return -1;
        }

        WTSRegisterSessionNotification(g_hwnd, NOTIFY_FOR_THIS_SESSION);

        vchannel_open();

        vchannel_write("HELLO", "0x%08x", 0);

        set_hooks_fn();

        /* Since we don't see the entire desktop we must resize windows
           immediatly. */
        SystemParametersInfo(SPI_SETDRAGFULLWINDOWS, TRUE, NULL, 0);

        /* Disable screen saver since we cannot catch its windows. */
        SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, FALSE, NULL, 0);

        if (strlen(cmdline) == 0)
        {
                message("No command line specified.");
                return -1;
        }
        else
        {
                BOOL result;
                DWORD exitcode;
                PROCESS_INFORMATION proc_info;
                STARTUPINFO startup_info;
                MSG msg;

                memset(&startup_info, 0, sizeof(STARTUPINFO));
                startup_info.cb = sizeof(STARTUPINFO);

                result = CreateProcess(NULL, cmdline, NULL, NULL, FALSE, 0,
                                       NULL, NULL, &startup_info, &proc_info);

                if (result)
                {
                        do
                        {
                                while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
                                {
                                        TranslateMessage(&msg);
                                        DispatchMessage(&msg);
                                }
                                process_cmds();
                                Sleep(100);
                                GetExitCodeProcess(proc_info.hProcess, &exitcode);
                        }
                        while (exitcode == STILL_ACTIVE);

                        // Release handles
                        CloseHandle(proc_info.hProcess);
                        CloseHandle(proc_info.hThread);
                }
                else
                {
                        // CreateProcess failed.
                        char msg[256];
                        _snprintf(msg, sizeof(msg),
                                  "Unable to launch the requested application:\n%s", cmdline);
                        message(msg);
                }
        }

        WTSUnRegisterSessionNotification(g_hwnd);

        remove_hooks_fn();

        FreeLibrary(hookdll);

        vchannel_close();

        return 1;
}
1	/* -- c-basic-offset: 8 --
2	rdesktop: A Remote Desktop Protocol client.
3	Seamless windows - Remote server executable
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 <windows.h>
26	#include <stdio.h>
27	#include <wtsapi32.h>
28	#include <cchannel.h>
29
30	#include "vchannel.h"
31
32	#include "resource.h"
33
34	#define APP_NAME "SeamlessRDP Shell"
35
36	#ifndef WM_WTSSESSION_CHANGE
37	#define WM_WTSSESSION_CHANGE 0x02B1
38	#endif
39	#ifndef WTS_REMOTE_CONNECT
40	#define WTS_REMOTE_CONNECT 0x3
41	#endif
42
43	/* Global data */
44	static HINSTANCE g_instance;
45	static HWND g_hwnd;
46
47	typedef void (*set_hooks_proc_t) ();
48	typedef void (*remove_hooks_proc_t) ();
49	typedef int (*get_instance_count_proc_t) ();
50
51	typedef void (*move_window_proc_t) (HWND hwnd, int x, int y, int width, int height);
52	typedef void (*zchange_proc_t) (HWND hwnd, HWND behind);
53	typedef void (*focus_proc_t) (HWND hwnd);
54	typedef void (*set_state_proc_t) (HWND hwnd, int state);
55
56	static move_window_proc_t g_move_window_fn = NULL;
57	static zchange_proc_t g_zchange_fn = NULL;
58	static focus_proc_t g_focus_fn = NULL;
59	static set_state_proc_t g_set_state_fn = NULL;
60
61	static void
62	message(const char *text)
63	{
64	MessageBox(GetDesktopWindow(), text, "SeamlessRDP Shell", MB_OK);
65	}
66
67	static char *
68	get_token(char **s)
69	{
70	char comma, head;
71	head = *s;
72
73	if (!head)
74	return NULL;
75
76	comma = strchr(head, ',');
77	if (comma)
78	{
79	*comma = '\0';
80	*s = comma + 1;
81	}
82	else
83	{
84	*s = NULL;
85	}
86
87	return head;
88	}
89
90	static BOOL CALLBACK
91	enum_cb(HWND hwnd, LPARAM lparam)
92	{
93	RECT rect;
94	unsigned short title[150];
95	LONG styles;
96	int state;
97	HWND parent;
98
99	styles = GetWindowLong(hwnd, GWL_STYLE);
100
101	if (!(styles & WS_VISIBLE))
102	return TRUE;
103
104	if (styles & WS_POPUP)
105	parent = (HWND) GetWindowLong(hwnd, GWL_HWNDPARENT);
106	else
107	parent = NULL;
108
109	vchannel_write("CREATE", "0x%p,0x%p,0x%x", hwnd, parent, 0);
110
111	if (!GetWindowRect(hwnd, &rect))
112	{
113	debug("GetWindowRect failed!");
114	return TRUE;
115	}
116
117	vchannel_write("POSITION", "0x%p,%d,%d,%d,%d,0x%x",
118	hwnd,
119	rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top, 0);
120
121	GetWindowTextW(hwnd, title, sizeof(title) / sizeof(*title));
122
123	vchannel_write("TITLE", "0x%x,%s,0x%x", hwnd, vchannel_strfilter_unicode(title), 0);
124
125	if (styles & WS_MAXIMIZE)
126	state = 2;
127	else if (styles & WS_MINIMIZE)
128	state = 1;
129	else
130	state = 0;
131
132	vchannel_write("STATE", "0x%p,0x%x,0x%x", hwnd, state, 0);
133
134	return TRUE;
135	}
136
137	static void
138	do_sync(void)
139	{
140	vchannel_block();
141
142	vchannel_write("SYNCBEGIN", "0x0");
143
144	EnumWindows(enum_cb, 0);
145
146	vchannel_write("SYNCEND", "0x0");
147
148	vchannel_unblock();
149	}
150
151	static void
152	do_state(unsigned int serial, HWND hwnd, int state)
153	{
154	g_set_state_fn(hwnd, state);
155	}
156
157	static void
158	do_position(unsigned int serial, HWND hwnd, int x, int y, int width, int height)
159	{
160	g_move_window_fn(hwnd, x, y, width, height);
161	}
162
163	static void
164	do_zchange(unsigned int serial, HWND hwnd, HWND behind)
165	{
166	g_zchange_fn(hwnd, behind);
167	}
168
169	static void
170	do_focus(unsigned int serial, HWND hwnd)
171	{
172	g_focus_fn(hwnd);
173	}
174
175	static void
176	process_cmds(void)
177	{
178	char line[VCHANNEL_MAX_LINE];
179	int size;
180
181	char p, tok1, tok2, tok3, tok4, tok5, tok6, tok7, *tok8;
182
183	while ((size = vchannel_read(line, sizeof(line))) >= 0)
184	{
185	p = line;
186
187	tok1 = get_token(&p);
188	tok2 = get_token(&p);
189	tok3 = get_token(&p);
190	tok4 = get_token(&p);
191	tok5 = get_token(&p);
192	tok6 = get_token(&p);
193	tok7 = get_token(&p);
194	tok8 = get_token(&p);
195
196	if (strcmp(tok1, "SYNC") == 0)
197	do_sync();
198	else if (strcmp(tok1, "STATE") == 0)
199	do_state(strtoul(tok2, NULL, 0), (HWND) strtoul(tok3, NULL, 0),
200	strtol(tok4, NULL, 0));
201	else if (strcmp(tok1, "POSITION") == 0)
202	do_position(strtoul(tok2, NULL, 0), (HWND) strtoul(tok3, NULL, 0),
203	strtol(tok4, NULL, 0), strtol(tok5, NULL, 0), strtol(tok6, NULL,
204	0),
205	strtol(tok7, NULL, 0));
206	else if (strcmp(tok1, "ZCHANGE") == 0)
207	do_zchange(strtoul(tok2, NULL, 0), (HWND) strtoul(tok3, NULL, 0),
208	(HWND) strtoul(tok4, NULL, 0));
209	else if (strcmp(tok1, "FOCUS") == 0)
210	do_focus(strtoul(tok2, NULL, 0), (HWND) strtoul(tok3, NULL, 0));
211	}
212	}
213
214	static LRESULT CALLBACK
215	wndproc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
216	{
217	if (message == WM_WTSSESSION_CHANGE)
218	{
219	if (wparam == WTS_REMOTE_CONNECT)
220	{
221	/* These get reset on each reconnect */
222	SystemParametersInfo(SPI_SETDRAGFULLWINDOWS, TRUE, NULL, 0);
223	SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, FALSE, NULL, 0);
224	vchannel_write("HELLO", "0x%08x", 1);
225	}
226	}
227
228	return DefWindowProc(hwnd, message, wparam, lparam);
229	}
230
231	static BOOL
232	register_class(void)
233	{
234	WNDCLASSEX wcx;
235
236	memset(&wcx, 0, sizeof(wcx));
237
238	wcx.cbSize = sizeof(wcx);
239	wcx.lpfnWndProc = wndproc;
240	wcx.hInstance = g_instance;
241	wcx.lpszClassName = "SeamlessClass";
242
243	return RegisterClassEx(&wcx);
244	}
245
246	static BOOL
247	create_wnd(void)
248	{
249	if (!register_class())
250	return FALSE;
251
252	g_hwnd = CreateWindow("SeamlessClass",
253	"Seamless Window",
254	WS_OVERLAPPEDWINDOW,
255	CW_USEDEFAULT,
256	CW_USEDEFAULT,
257	CW_USEDEFAULT,
258	CW_USEDEFAULT, (HWND) NULL, (HMENU) NULL, g_instance, (LPVOID) NULL);
259
260	if (!g_hwnd)
261	return FALSE;
262
263	return TRUE;
264	}
265
266	int WINAPI
267	WinMain(HINSTANCE instance, HINSTANCE prev_instance, LPSTR cmdline, int cmdshow)
268	{
269	HMODULE hookdll;
270
271	set_hooks_proc_t set_hooks_fn;
272	remove_hooks_proc_t remove_hooks_fn;
273	get_instance_count_proc_t instance_count_fn;
274
275	g_instance = instance;
276
277	hookdll = LoadLibrary("seamlessrdp.dll");
278	if (!hookdll)
279	{
280	message("Could not load hook DLL. Unable to continue.");
281	return -1;
282	}
283
284	set_hooks_fn = (set_hooks_proc_t) GetProcAddress(hookdll, "SetHooks");
285	remove_hooks_fn = (remove_hooks_proc_t) GetProcAddress(hookdll, "RemoveHooks");
286	instance_count_fn = (get_instance_count_proc_t) GetProcAddress(hookdll, "GetInstanceCount");
287	g_move_window_fn = (move_window_proc_t) GetProcAddress(hookdll, "SafeMoveWindow");
288	g_zchange_fn = (zchange_proc_t) GetProcAddress(hookdll, "SafeZChange");
289	g_focus_fn = (focus_proc_t) GetProcAddress(hookdll, "SafeFocus");
290	g_set_state_fn = (set_state_proc_t) GetProcAddress(hookdll, "SafeSetState");
291
292	if (!set_hooks_fn \|\| !remove_hooks_fn \|\| !instance_count_fn \|\| !g_move_window_fn
293	\|\| !g_zchange_fn \|\| !g_focus_fn \|\| !g_set_state_fn)
294	{
295	FreeLibrary(hookdll);
296	message("Hook DLL doesn't contain the correct functions. Unable to continue.");
297	return -1;
298	}
299
300	/* Check if the DLL is already loaded */
301	if (instance_count_fn() != 1)
302	{
303	FreeLibrary(hookdll);
304	message("Another running instance of Seamless RDP detected.");
305	return -1;
306	}
307
308	if (!create_wnd())
309	{
310	FreeLibrary(hookdll);
311	message("Couldn't create a window to catch events.");
312	return -1;
313	}
314
315	WTSRegisterSessionNotification(g_hwnd, NOTIFY_FOR_THIS_SESSION);
316
317	vchannel_open();
318
319	vchannel_write("HELLO", "0x%08x", 0);
320
321	set_hooks_fn();
322
323	/* Since we don't see the entire desktop we must resize windows
324	immediatly. */
325	SystemParametersInfo(SPI_SETDRAGFULLWINDOWS, TRUE, NULL, 0);
326
327	/* Disable screen saver since we cannot catch its windows. */
328	SystemParametersInfo(SPI_SETSCREENSAVEACTIVE, FALSE, NULL, 0);
329
330	if (strlen(cmdline) == 0)
331	{
332	message("No command line specified.");
333	return -1;
334	}
335	else
336	{
337	BOOL result;
338	DWORD exitcode;
339	PROCESS_INFORMATION proc_info;
340	STARTUPINFO startup_info;
341	MSG msg;
342
343	memset(&startup_info, 0, sizeof(STARTUPINFO));
344	startup_info.cb = sizeof(STARTUPINFO);
345
346	result = CreateProcess(NULL, cmdline, NULL, NULL, FALSE, 0,
347	NULL, NULL, &startup_info, &proc_info);
348
349	if (result)
350	{
351	do
352	{
353	while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))
354	{
355	TranslateMessage(&msg);
356	DispatchMessage(&msg);
357	}
358	process_cmds();
359	Sleep(100);
360	GetExitCodeProcess(proc_info.hProcess, &exitcode);
361	}
362	while (exitcode == STILL_ACTIVE);
363
364	// Release handles
365	CloseHandle(proc_info.hProcess);
366	CloseHandle(proc_info.hThread);
367	}
368	else
369	{
370	// CreateProcess failed.
371	char msg[256];
372	_snprintf(msg, sizeof(msg),
373	"Unable to launch the requested application:\n%s", cmdline);
374	message(msg);
375	}
376	}
377
378	WTSUnRegisterSessionNotification(g_hwnd);
379
380	remove_hooks_fn();
381
382	FreeLibrary(hookdll);
383
384	vchannel_close();
385
386	return 1;
387	}