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/* -*- c-basic-offset: 8 -*- |
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rdesktop: A Remote Desktop Protocol client. |
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Seamless windows - Remote server hook DLL |
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|
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Based on code copyright (C) 2004-2005 Martin Wickett |
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|
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Copyright (C) Peter Åstrand <astrand@cendio.se> 2005-2006 |
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Copyright (C) Pierre Ossman <ossman@cendio.se> 2006 |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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*/ |
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|
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#include <stdio.h> |
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#include <stdarg.h> |
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|
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#include <windows.h> |
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#include <winuser.h> |
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#include <wtsapi32.h> |
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#include <cchannel.h> |
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|
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#include "hookdll.h" |
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|
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#define DLL_EXPORT __declspec(dllexport) |
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|
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// Shared DATA |
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#pragma data_seg ( "SHAREDDATA" ) |
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|
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// this is the total number of processes this dll is currently attached to |
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int g_instance_count = 0; |
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|
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#pragma data_seg () |
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|
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#pragma comment(linker, "/section:SHAREDDATA,rws") |
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|
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static HHOOK g_cbt_hook = NULL; |
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static HHOOK g_wndproc_hook = NULL; |
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|
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static HINSTANCE g_instance = NULL; |
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|
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static HANDLE g_mutex = NULL; |
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|
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static HANDLE g_vchannel = NULL; |
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|
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static void |
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debug(char *format, ...) |
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{ |
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va_list argp; |
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char buf[256]; |
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|
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sprintf(buf, "DEBUG1,"); |
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|
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va_start(argp, format); |
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_vsnprintf(buf + sizeof("DEBUG1,") - 1, sizeof(buf) - sizeof("DEBUG1,") + 1, format, argp); |
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va_end(argp); |
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|
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vchannel_write(buf); |
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} |
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|
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static LRESULT CALLBACK |
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wndproc_hook_proc(int code, WPARAM cur_thread, LPARAM details) |
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{ |
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HWND hwnd = ((CWPSTRUCT *) details)->hwnd; |
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UINT msg = ((CWPSTRUCT *) details)->message; |
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WPARAM wparam = ((CWPSTRUCT *) details)->wParam; |
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LPARAM lparam = ((CWPSTRUCT *) details)->lParam; |
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|
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LONG style = GetWindowLong(hwnd, GWL_STYLE); |
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WINDOWPOS *wp = (WINDOWPOS *) lparam; |
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RECT rect; |
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|
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if (code < 0) |
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goto end; |
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|
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switch (msg) |
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{ |
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|
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case WM_WINDOWPOSCHANGED: |
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if (style & WS_CHILD) |
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break; |
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|
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|
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if (wp->flags & SWP_SHOWWINDOW) |
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{ |
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// FIXME: Now, just like create! |
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debug("SWP_SHOWWINDOW for %p!", hwnd); |
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vchannel_write("CREATE1,0x%p,0x%x", hwnd, 0); |
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|
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// FIXME: SETSTATE |
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|
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if (!GetWindowRect(hwnd, &rect)) |
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{ |
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debug("GetWindowRect failed!\n"); |
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break; |
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} |
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vchannel_write("POSITION1,0x%p,%d,%d,%d,%d,0x%x", |
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hwnd, |
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rect.left, rect.top, |
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rect.right - rect.left, rect.bottom - rect.top, 0); |
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} |
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|
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|
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if (wp->flags & SWP_HIDEWINDOW) |
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vchannel_write("DESTROY1,0x%p,0x%x", hwnd, 0); |
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|
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|
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if (!(style & WS_VISIBLE)) |
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break; |
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|
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if (wp->flags & SWP_NOMOVE && wp->flags & SWP_NOSIZE) |
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break; |
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|
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if (!GetWindowRect(hwnd, &rect)) |
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{ |
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debug("GetWindowRect failed!\n"); |
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break; |
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} |
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|
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vchannel_write("POSITION1,0x%p,%d,%d,%d,%d,0x%x", |
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hwnd, |
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rect.left, rect.top, |
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rect.right - rect.left, rect.bottom - rect.top, 0); |
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|
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break; |
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|
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|
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/* Note: WM_WINDOWPOSCHANGING/WM_WINDOWPOSCHANGED are |
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strange. Sometimes, for example when bringing up the |
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Notepad About dialog, only an WM_WINDOWPOSCHANGING is |
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sent. In some other cases, for exmaple when opening |
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Format->Text in Notepad, both events are sent. Also, for |
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some reason, when closing the Notepad About dialog, an |
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WM_WINDOWPOSCHANGING event is sent which looks just like |
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the event that was sent when the About dialog was opened... */ |
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case WM_WINDOWPOSCHANGING: |
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if (style & WS_CHILD) |
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break; |
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|
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if (!(style & WS_VISIBLE)) |
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break; |
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|
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if (!(wp->flags & SWP_NOZORDER)) |
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vchannel_write("ZCHANGE1,0x%p,0x%p,0x%x", |
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hwnd, |
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wp->flags & SWP_NOACTIVATE ? wp->hwndInsertAfter : 0, |
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0); |
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|
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break; |
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|
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|
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|
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|
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case WM_DESTROY: |
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if (style & WS_CHILD) |
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break; |
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|
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vchannel_write("DESTROY1,0x%p,0x%x", hwnd, 0); |
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|
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break; |
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|
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|
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default: |
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break; |
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} |
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|
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end: |
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return CallNextHookEx(g_wndproc_hook, code, cur_thread, details); |
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} |
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|
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static LRESULT CALLBACK |
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cbt_hook_proc(int code, WPARAM wparam, LPARAM lparam) |
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{ |
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char title[150]; |
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|
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if (code < 0) |
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goto end; |
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|
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switch (code) |
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{ |
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case HCBT_MINMAX: |
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{ |
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int show; |
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|
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show = LOWORD(lparam); |
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|
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if ((show == SW_SHOWMINIMIZED) || (show == SW_MINIMIZE)) |
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{ |
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MessageBox(0, |
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"Minimizing windows is not allowed in this version. Sorry!", |
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"SeamlessRDP", MB_OK); |
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return 1; |
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} |
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|
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GetWindowText((HWND) wparam, title, sizeof(title)); |
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|
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/* FIXME: Strip title of dangerous characters */ |
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|
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vchannel_write("SETSTATE1,0x%p,%s,0x%x,0x%x", |
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(HWND) wparam, title, show, 0); |
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break; |
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} |
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|
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default: |
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break; |
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} |
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|
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end: |
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return CallNextHookEx(g_cbt_hook, code, wparam, lparam); |
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} |
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|
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int |
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vchannel_open() |
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{ |
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g_vchannel = WTSVirtualChannelOpen(WTS_CURRENT_SERVER_HANDLE, |
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WTS_CURRENT_SESSION, CHANNELNAME); |
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|
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if (g_vchannel == NULL) |
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return 0; |
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else |
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return 1; |
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} |
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|
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int |
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vchannel_close() |
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{ |
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BOOL result; |
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|
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result = WTSVirtualChannelClose(g_vchannel); |
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|
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g_vchannel = NULL; |
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|
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if (result) |
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return 1; |
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else |
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return 0; |
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} |
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|
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int |
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vchannel_is_open() |
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{ |
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if (g_vchannel == NULL) |
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return 0; |
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else |
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return 1; |
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} |
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|
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int |
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vchannel_write(char *format, ...) |
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{ |
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BOOL result; |
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va_list argp; |
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char buf[1024]; |
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int size; |
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ULONG bytes_written; |
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|
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if (!vchannel_is_open()) |
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return 1; |
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|
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va_start(argp, format); |
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size = _vsnprintf(buf, sizeof(buf), format, argp); |
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va_end(argp); |
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|
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if (size >= sizeof(buf)) |
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return 0; |
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|
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WaitForSingleObject(g_mutex, INFINITE); |
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result = WTSVirtualChannelWrite(g_vchannel, buf, (ULONG) strlen(buf), &bytes_written); |
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result = WTSVirtualChannelWrite(g_vchannel, "\n", (ULONG) 1, &bytes_written); |
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ReleaseMutex(g_mutex); |
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|
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if (result) |
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return 1; |
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else |
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return 0; |
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} |
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|
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DLL_EXPORT void |
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SetHooks(void) |
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{ |
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if (!g_cbt_hook) |
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g_cbt_hook = SetWindowsHookEx(WH_CBT, cbt_hook_proc, g_instance, 0); |
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|
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if (!g_wndproc_hook) |
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g_wndproc_hook = SetWindowsHookEx(WH_CALLWNDPROC, wndproc_hook_proc, g_instance, 0); |
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} |
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|
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DLL_EXPORT void |
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RemoveHooks(void) |
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{ |
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if (g_cbt_hook) |
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UnhookWindowsHookEx(g_cbt_hook); |
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|
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if (g_wndproc_hook) |
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UnhookWindowsHookEx(g_wndproc_hook); |
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} |
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|
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DLL_EXPORT int |
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GetInstanceCount() |
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{ |
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return g_instance_count; |
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} |
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|
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BOOL APIENTRY |
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DllMain(HINSTANCE hinstDLL, DWORD ul_reason_for_call, LPVOID lpReserved) |
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{ |
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switch (ul_reason_for_call) |
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{ |
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case DLL_PROCESS_ATTACH: |
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// remember our instance handle |
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g_instance = hinstDLL; |
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|
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g_mutex = CreateMutex(NULL, FALSE, "Local\\Seamless"); |
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if (!g_mutex) |
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return FALSE; |
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|
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WaitForSingleObject(g_mutex, INFINITE); |
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++g_instance_count; |
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ReleaseMutex(g_mutex); |
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|
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vchannel_open(); |
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|
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break; |
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|
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case DLL_THREAD_ATTACH: |
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break; |
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|
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case DLL_THREAD_DETACH: |
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break; |
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|
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case DLL_PROCESS_DETACH: |
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WaitForSingleObject(g_mutex, INFINITE); |
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--g_instance_count; |
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ReleaseMutex(g_mutex); |
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|
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vchannel_close(); |
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|
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CloseHandle(g_mutex); |
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|
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break; |
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} |
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|
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return TRUE; |
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} |
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