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KasmVNC/win/rfb_win32/SInput.cxx
matt 408c005d3e Initial commit
2020-09-20 12:16:44 +00:00

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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* This 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 software 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 software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
// -=- SInput.cxx
//
// A number of routines that accept VNC input event data and perform
// the appropriate actions under Win32
#define XK_MISCELLANY
#define XK_LATIN1
#define XK_CURRENCY
#include <rfb/keysymdef.h>
#include <tchar.h>
#include <rfb_win32/SInput.h>
#include <rfb_win32/MonitorInfo.h>
#include <rfb_win32/Service.h>
#include <rfb_win32/keymap.h>
#include <rdr/Exception.h>
#include <rfb/LogWriter.h>
using namespace rfb;
static LogWriter vlog("SInput");
//
// -=- Pointer implementation for Win32
//
static DWORD buttonDownMapping[8] = {
MOUSEEVENTF_LEFTDOWN, MOUSEEVENTF_MIDDLEDOWN, MOUSEEVENTF_RIGHTDOWN,
MOUSEEVENTF_WHEEL, MOUSEEVENTF_WHEEL, 0, 0, 0
};
static DWORD buttonUpMapping[8] = {
MOUSEEVENTF_LEFTUP, MOUSEEVENTF_MIDDLEUP, MOUSEEVENTF_RIGHTUP,
MOUSEEVENTF_WHEEL, MOUSEEVENTF_WHEEL, 0, 0, 0
};
static DWORD buttonDataMapping[8] = {
0, 0, 0, 120, (DWORD)-120, 0, 0, 0
};
win32::SPointer::SPointer()
: last_buttonmask(0)
{
}
void
win32::SPointer::pointerEvent(const Point& pos, int buttonmask)
{
// - We are specifying absolute coordinates
DWORD flags = MOUSEEVENTF_ABSOLUTE;
// - Has the pointer moved since the last event?
if (!last_position.equals(pos))
flags |= MOUSEEVENTF_MOVE;
// - If the system swaps left and right mouse buttons then we must
// swap them here to negate the effect, so that we do the actual
// action we mean to do
if (::GetSystemMetrics(SM_SWAPBUTTON)) {
bool leftDown = buttonmask & 1;
bool rightDown = buttonmask & 4;
buttonmask = (buttonmask & ~(1 | 4));
if (leftDown) buttonmask |= 4;
if (rightDown) buttonmask |= 1;
}
DWORD data = 0;
for (int i = 0; i < 8; i++) {
if ((buttonmask & (1<<i)) != (last_buttonmask & (1<<i))) {
if (buttonmask & (1<<i)) {
flags |= buttonDownMapping[i];
if (buttonDataMapping[i]) {
if (data) vlog.info("warning - two buttons set mouse_event data field");
data = buttonDataMapping[i];
}
} else {
flags |= buttonUpMapping[i];
}
}
}
last_position = pos;
last_buttonmask = buttonmask;
Rect primaryDisplay(0,0,GetSystemMetrics(SM_CXSCREEN),GetSystemMetrics(SM_CYSCREEN));
if (primaryDisplay.contains(pos)) {
// mouse_event wants coordinates specified as a proportion of the
// primary display's size, scaled to the range 0 to 65535
Point scaled;
scaled.x = (pos.x * 65535) / (primaryDisplay.width()-1);
scaled.y = (pos.y * 65535) / (primaryDisplay.height()-1);
::mouse_event(flags, scaled.x, scaled.y, data, 0);
} else {
// The event lies outside the primary monitor. Under Win2K, we can just use
// SendInput, which allows us to provide coordinates scaled to the virtual desktop.
// SendInput is available on all multi-monitor-aware platforms.
INPUT evt;
evt.type = INPUT_MOUSE;
Point vPos(pos.x-GetSystemMetrics(SM_XVIRTUALSCREEN),
pos.y-GetSystemMetrics(SM_YVIRTUALSCREEN));
evt.mi.dx = (vPos.x * 65535) / (GetSystemMetrics(SM_CXVIRTUALSCREEN)-1);
evt.mi.dy = (vPos.y * 65535) / (GetSystemMetrics(SM_CYVIRTUALSCREEN)-1);
evt.mi.dwFlags = flags | MOUSEEVENTF_VIRTUALDESK;
evt.mi.dwExtraInfo = 0;
evt.mi.mouseData = data;
evt.mi.time = 0;
if (SendInput(1, &evt, sizeof(evt)) != 1)
throw rdr::SystemException("SendInput", GetLastError());
}
}
//
// -=- Keyboard implementation
//
BoolParameter rfb::win32::SKeyboard::deadKeyAware("DeadKeyAware",
"Whether to assume the viewer has already interpreted dead key sequences "
"into latin-1 characters", true);
BoolParameter rfb::win32::SKeyboard::rawKeyboard("RawKeyboard",
"Send keyboard events straight through and avoid mapping them to the "
"current keyboard layout", false);
// The keysymToAscii table transforms a couple of awkward keysyms into their
// ASCII equivalents.
struct keysymToAscii_t {
rdr::U32 keysym;
rdr::U8 ascii;
};
keysymToAscii_t keysymToAscii[] = {
{ XK_KP_Space, ' ' },
{ XK_KP_Equal, '=' },
};
rdr::U8 latin1DeadChars[] = {
XK_grave, XK_acute, XK_asciicircum, XK_diaeresis, XK_degree, XK_cedilla,
XK_asciitilde
};
struct latin1ToDeadChars_t {
rdr::U8 latin1Char;
rdr::U8 deadChar;
rdr::U8 baseChar;
};
latin1ToDeadChars_t latin1ToDeadChars[] = {
{ XK_Agrave, XK_grave, XK_A },
{ XK_Egrave, XK_grave, XK_E },
{ XK_Igrave, XK_grave, XK_I },
{ XK_Ograve, XK_grave, XK_O },
{ XK_Ugrave, XK_grave, XK_U },
{ XK_agrave, XK_grave, XK_a },
{ XK_egrave, XK_grave, XK_e },
{ XK_igrave, XK_grave, XK_i },
{ XK_ograve, XK_grave, XK_o},
{ XK_ugrave, XK_grave, XK_u },
{ XK_Aacute, XK_acute, XK_A },
{ XK_Eacute, XK_acute, XK_E },
{ XK_Iacute, XK_acute, XK_I },
{ XK_Oacute, XK_acute, XK_O },
{ XK_Uacute, XK_acute, XK_U },
{ XK_Yacute, XK_acute, XK_Y },
{ XK_aacute, XK_acute, XK_a },
{ XK_eacute, XK_acute, XK_e },
{ XK_iacute, XK_acute, XK_i },
{ XK_oacute, XK_acute, XK_o},
{ XK_uacute, XK_acute, XK_u },
{ XK_yacute, XK_acute, XK_y },
{ XK_Acircumflex, XK_asciicircum, XK_A },
{ XK_Ecircumflex, XK_asciicircum, XK_E },
{ XK_Icircumflex, XK_asciicircum, XK_I },
{ XK_Ocircumflex, XK_asciicircum, XK_O },
{ XK_Ucircumflex, XK_asciicircum, XK_U },
{ XK_acircumflex, XK_asciicircum, XK_a },
{ XK_ecircumflex, XK_asciicircum, XK_e },
{ XK_icircumflex, XK_asciicircum, XK_i },
{ XK_ocircumflex, XK_asciicircum, XK_o},
{ XK_ucircumflex, XK_asciicircum, XK_u },
{ XK_Adiaeresis, XK_diaeresis, XK_A },
{ XK_Ediaeresis, XK_diaeresis, XK_E },
{ XK_Idiaeresis, XK_diaeresis, XK_I },
{ XK_Odiaeresis, XK_diaeresis, XK_O },
{ XK_Udiaeresis, XK_diaeresis, XK_U },
{ XK_adiaeresis, XK_diaeresis, XK_a },
{ XK_ediaeresis, XK_diaeresis, XK_e },
{ XK_idiaeresis, XK_diaeresis, XK_i },
{ XK_odiaeresis, XK_diaeresis, XK_o},
{ XK_udiaeresis, XK_diaeresis, XK_u },
{ XK_ydiaeresis, XK_diaeresis, XK_y },
{ XK_Aring, XK_degree, XK_A },
{ XK_aring, XK_degree, XK_a },
{ XK_Ccedilla, XK_cedilla, XK_C },
{ XK_ccedilla, XK_cedilla, XK_c },
{ XK_Atilde, XK_asciitilde, XK_A },
{ XK_Ntilde, XK_asciitilde, XK_N },
{ XK_Otilde, XK_asciitilde, XK_O },
{ XK_atilde, XK_asciitilde, XK_a },
{ XK_ntilde, XK_asciitilde, XK_n },
{ XK_otilde, XK_asciitilde, XK_o },
};
// doKeyboardEvent wraps the system keybd_event function and attempts to find
// the appropriate scancode corresponding to the supplied virtual keycode.
inline void doKeyboardEvent(BYTE vkCode, DWORD flags) {
vlog.debug("vkCode 0x%x flags 0x%lx", vkCode, flags);
keybd_event(vkCode, MapVirtualKey(vkCode, 0), flags, 0);
}
inline void doScanCodeEvent(BYTE scancode, bool down) {
INPUT evt;
evt.type = INPUT_KEYBOARD;
evt.ki.wVk = 0;
evt.ki.dwFlags = KEYEVENTF_SCANCODE;
if (!down)
evt.ki.dwFlags |= KEYEVENTF_KEYUP;
if (scancode & 0x80) {
evt.ki.dwFlags |= KEYEVENTF_EXTENDEDKEY;
scancode &= ~0x80;
}
evt.ki.wScan = scancode;
evt.ki.dwExtraInfo = 0;
evt.ki.time = 0;
vlog.debug("SendInput ScanCode: 0x%x Flags: 0x%lx %s", scancode,
evt.ki.dwFlags, down ? "Down" : "Up");
// Windows has some bug where it doesn't look up scan code 0x45
// properly, so we need to help it out
if (evt.ki.wScan == 0x45) {
evt.ki.dwFlags &= ~KEYEVENTF_SCANCODE;
if (evt.ki.dwFlags & KEYEVENTF_EXTENDEDKEY)
evt.ki.wVk = VK_NUMLOCK;
else
evt.ki.wVk = VK_PAUSE;
}
if (SendInput(1, &evt, sizeof(evt)) != 1)
vlog.error("SendInput %lu", GetLastError());
}
// KeyStateModifier is a class which helps simplify generating a "fake" press
// or release of shift, ctrl, alt, etc. An instance of the class is created
// for every key which may need to be pressed or released. Then either press()
// or release() may be called to make sure that the corresponding key is in the
// right state. The destructor of the class automatically reverts to the
// previous state.
class KeyStateModifier {
public:
KeyStateModifier(int vkCode_, int flags_=0)
: vkCode(vkCode_), flags(flags_), pressed(false), released(false)
{}
void press() {
if (!(GetAsyncKeyState(vkCode) & 0x8000)) {
doKeyboardEvent(vkCode, flags);
pressed = true;
}
}
void release() {
if (GetAsyncKeyState(vkCode) & 0x8000) {
doKeyboardEvent(vkCode, flags | KEYEVENTF_KEYUP);
released = true;
}
}
~KeyStateModifier() {
if (pressed) {
doKeyboardEvent(vkCode, flags | KEYEVENTF_KEYUP);
} else if (released) {
doKeyboardEvent(vkCode, flags);
}
}
int vkCode;
int flags;
bool pressed;
bool released;
};
// doKeyEventWithModifiers() generates a key event having first "pressed" or
// "released" the shift, ctrl or alt modifiers if necessary.
void doKeyEventWithModifiers(BYTE vkCode, BYTE modifierState, bool down)
{
KeyStateModifier ctrl(VK_CONTROL);
KeyStateModifier alt(VK_MENU);
KeyStateModifier shift(VK_SHIFT);
if (down) {
if (modifierState & 2) ctrl.press();
if (modifierState & 4) alt.press();
if (modifierState & 1) {
shift.press();
} else {
shift.release();
}
}
doKeyboardEvent(vkCode, down ? 0 : KEYEVENTF_KEYUP);
}
win32::SKeyboard::SKeyboard()
{
for (unsigned int i = 0; i < sizeof(keymap) / sizeof(keymap_t); i++) {
vkMap[keymap[i].keysym] = keymap[i].vk;
extendedMap[keymap[i].keysym] = keymap[i].extended;
}
// Find dead characters for the current keyboard layout
// XXX how could we handle the keyboard layout changing?
BYTE keystate[256];
memset(keystate, 0, 256);
for (unsigned int j = 0; j < sizeof(latin1DeadChars); j++) {
SHORT s = VkKeyScan(latin1DeadChars[j]);
if (s != -1) {
BYTE vkCode = LOBYTE(s);
BYTE modifierState = HIBYTE(s);
keystate[VK_SHIFT] = (modifierState & 1) ? 0x80 : 0;
keystate[VK_CONTROL] = (modifierState & 2) ? 0x80 : 0;
keystate[VK_MENU] = (modifierState & 4) ? 0x80 : 0;
rdr::U8 chars[2];
int nchars = ToAscii(vkCode, 0, keystate, (WORD*)&chars, 0);
if (nchars < 0) {
vlog.debug("Found dead key 0x%x '%c'",
latin1DeadChars[j], latin1DeadChars[j]);
deadChars.push_back(latin1DeadChars[j]);
ToAscii(vkCode, 0, keystate, (WORD*)&chars, 0);
}
}
}
}
void win32::SKeyboard::keyEvent(rdr::U32 keysym, rdr::U32 keycode, bool down)
{
// If scan code is available use that directly as windows uses
// compatible scancodes
if (keycode && rawKeyboard) {
// However NumLock incorrectly has the extended bit set
if (keycode == 0x45)
keycode = 0xc5;
// And Pause uses NumLock's proper code, except when Control is
// also pressed (i.e. when it is generating Break)
if ((keycode == 0xc6) && !(GetAsyncKeyState(VK_CONTROL) & 0x8000))
keycode = 0x45;
// And PrintScreen uses a different code than Alt+PrintScreen (SysRq)
if ((keycode == 0x54) && !(GetAsyncKeyState(VK_MENU) & 0x8000))
keycode = 0xb7;
if (down && (keycode == 0xd3) &&
((GetAsyncKeyState(VK_CONTROL) & 0x8000) != 0) &&
((GetAsyncKeyState(VK_MENU) & 0x8000) != 0))
{
rfb::win32::emulateCtrlAltDel();
return;
}
doScanCodeEvent(keycode, down);
return;
}
for (unsigned int i = 0; i < sizeof(keysymToAscii) / sizeof(keysymToAscii_t); i++) {
if (keysymToAscii[i].keysym == keysym) {
keysym = keysymToAscii[i].ascii;
break;
}
}
if ((keysym >= 32 && keysym <= 126) ||
(keysym >= 160 && keysym <= 255))
{
// ordinary Latin-1 character
if (deadKeyAware) {
// Detect dead chars and generate the dead char followed by space so
// that we'll end up with the original char.
for (unsigned int i = 0; i < deadChars.size(); i++) {
if (keysym == deadChars[i]) {
SHORT dc = VkKeyScan(keysym);
if (dc != -1) {
if (down) {
vlog.info("latin-1 dead key: 0x%x vkCode 0x%x mod 0x%x "
"followed by space", keysym, LOBYTE(dc), HIBYTE(dc));
doKeyEventWithModifiers(LOBYTE(dc), HIBYTE(dc), true);
doKeyEventWithModifiers(LOBYTE(dc), HIBYTE(dc), false);
doKeyEventWithModifiers(VK_SPACE, 0, true);
doKeyEventWithModifiers(VK_SPACE, 0, false);
}
return;
}
}
}
}
SHORT s = VkKeyScan(keysym);
if (s == -1) {
if (down) {
// not a single keypress - try synthesizing dead chars.
for (unsigned int j = 0;
j < sizeof(latin1ToDeadChars) / sizeof(latin1ToDeadChars_t);
j++) {
if (keysym == latin1ToDeadChars[j].latin1Char) {
for (unsigned int i = 0; i < deadChars.size(); i++) {
if (deadChars[i] == latin1ToDeadChars[j].deadChar) {
SHORT dc = VkKeyScan(latin1ToDeadChars[j].deadChar);
SHORT bc = VkKeyScan(latin1ToDeadChars[j].baseChar);
if (dc != -1 && bc != -1) {
vlog.info("latin-1 key: 0x%x dead key vkCode 0x%x mod 0x%x "
"followed by vkCode 0x%x mod 0x%x",
keysym, LOBYTE(dc), HIBYTE(dc),
LOBYTE(bc), HIBYTE(bc));
doKeyEventWithModifiers(LOBYTE(dc), HIBYTE(dc), true);
doKeyEventWithModifiers(LOBYTE(dc), HIBYTE(dc), false);
doKeyEventWithModifiers(LOBYTE(bc), HIBYTE(bc), true);
doKeyEventWithModifiers(LOBYTE(bc), HIBYTE(bc), false);
return;
}
break;
}
}
break;
}
}
vlog.info("ignoring unrecognised Latin-1 keysym 0x%x",keysym);
}
return;
}
BYTE vkCode = LOBYTE(s);
BYTE modifierState = HIBYTE(s);
vlog.debug("latin-1 key: 0x%x vkCode 0x%x mod 0x%x down %d",
keysym, vkCode, modifierState, down);
doKeyEventWithModifiers(vkCode, modifierState, down);
} else {
// see if it's a recognised keyboard key, otherwise ignore it
if (vkMap.find(keysym) == vkMap.end()) {
vlog.info("ignoring unknown keysym 0x%x",keysym);
return;
}
BYTE vkCode = vkMap[keysym];
DWORD flags = 0;
if (extendedMap[keysym]) flags |= KEYEVENTF_EXTENDEDKEY;
if (!down) flags |= KEYEVENTF_KEYUP;
vlog.debug("keyboard key: keysym 0x%x vkCode 0x%x ext %d down %d",
keysym, vkCode, extendedMap[keysym], down);
if (down && (vkCode == VK_DELETE) &&
((GetAsyncKeyState(VK_CONTROL) & 0x8000) != 0) &&
((GetAsyncKeyState(VK_MENU) & 0x8000) != 0))
{
rfb::win32::emulateCtrlAltDel();
return;
}
doKeyboardEvent(vkCode, flags);
}
}
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