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tdebase/tdekbdledsync/main.cpp

509 lines
14 KiB

/*
Copyright 2011-2013 Timothy Pearson <kb9vqf@pearsoncomputing.net>
This file is part of tdekbdledsync, the TDE Keyboard LED Synchronization Daemon
tdekbdledsync 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 3
of the License, or (at your option) any later version.
tdekbdledsync 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 tdekbdledsync. If not, see http://www.gnu.org/licenses/.
*/
// The idea here is to periodically read the Xorg core keyboard state, and then forcibly set the physical LED states on all attached keyboards to match (via the event interface)
// Once every half second should work well enough on most systems
#include <stdio.h>
#include <stdlib.h>
#include <exception>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <dirent.h>
#include <linux/vt.h>
#include <linux/input.h>
#include <linux/uinput.h>
#include <sys/file.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/select.h>
#include <sys/time.h>
#include <termios.h>
#include <signal.h>
#include <stdint.h>
extern "C" {
#include <libudev.h>
#include "getfd.h"
}
#include <libgen.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/XKBlib.h>
#include <X11/extensions/XTest.h>
#include <X11/keysym.h>
using namespace std;
// WARNING
// MAX_KEYBOARDS must be greater than or equal to MAX_INPUT_NODE
#define MAX_KEYBOARDS 128
#define MAX_INPUT_NODE 128
#define TestBit(bit, array) (array[(bit) / 8] & (1 << ((bit) % 8)))
typedef unsigned char byte;
char filename[32];
char key_bitmask[(KEY_MAX + 7) / 8];
int keyboard_fd_num;
int keyboard_fds[MAX_KEYBOARDS];
Display* display = NULL;
int lockfd = -1;
char lockFileName[256];
// --------------------------------------------------------------------------------------
// Useful function from Stack Overflow
// http://stackoverflow.com/questions/874134/find-if-string-endswith-another-string-in-c
// --------------------------------------------------------------------------------------
/* returns 1 iff str ends with suffix */
int str_ends_with(const char * str, const char * suffix) {
if( str == NULL || suffix == NULL )
return 0;
size_t str_len = strlen(str);
size_t suffix_len = strlen(suffix);
if(suffix_len > str_len)
return 0;
return 0 == strncmp( str + str_len - suffix_len, suffix, suffix_len );
}
// --------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------
// Useful function from Stack Overflow
// http://stackoverflow.com/questions/1599459/optimal-lock-file-method
// --------------------------------------------------------------------------------------
int tryGetLock(char const *lockName) {
mode_t m = umask( 0 );
int fd = open( lockName, O_RDWR|O_CREAT, 0666 );
umask( m );
if( fd >= 0 && flock( fd, LOCK_EX | LOCK_NB ) < 0 ) {
close( fd );
fd = -1;
}
return fd;
}
// --------------------------------------------------------------------------------------
// Useful function from Stack Overflow
// http://stackoverflow.com/questions/1599459/optimal-lock-file-method
// --------------------------------------------------------------------------------------
void releaseLock(int fd, char const *lockName) {
if( fd < 0 ) {
return;
}
remove( lockName );
close( fd );
}
// --------------------------------------------------------------------------------------
// Get the VT number X is running on
// (code taken from GDM, daemon/getvt.c, GPLv2+)
// --------------------------------------------------------------------------------------
int get_x_vtnum(Display *dpy)
{
Atom prop;
Atom actualtype;
int actualformat;
unsigned long nitems;
unsigned long bytes_after;
unsigned char *buf;
int num;
prop = XInternAtom (dpy, "XFree86_VT", False);
if (prop == None)
return -1;
if (XGetWindowProperty (dpy, DefaultRootWindow (dpy), prop, 0, 1,
False, AnyPropertyType, &actualtype, &actualformat,
&nitems, &bytes_after, &buf)) {
return -1;
}
if (nitems != 1) {
XFree (buf);
return -1;
}
switch (actualtype) {
case XA_CARDINAL:
case XA_INTEGER:
case XA_WINDOW:
switch (actualformat) {
case 8:
num = (*(uint8_t *)(void *)buf);
break;
case 16:
num = (*(uint16_t *)(void *)buf);
break;
case 32:
num = (*(uint32_t *)(void *)buf);
break;
default:
XFree (buf);
return -1;
}
break;
default:
XFree (buf);
return -1;
}
XFree (buf);
return num;
}
// --------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------
// Get the specified xkb mask modifier
// (code taken from numlockx)
// --------------------------------------------------------------------------------------
unsigned int xkb_mask_modifier(XkbDescPtr xkb, const char *name) {
int i;
if( !xkb || !xkb->names ) {
return 0;
}
for( i = 0; i < XkbNumVirtualMods; i++ ) {
char* modStr = XGetAtomName( xkb->dpy, xkb->names->vmods[i] );
if( modStr != NULL && strcmp(name, modStr) == 0 ) {
unsigned int mask;
XkbVirtualModsToReal( xkb, 1 << i, &mask );
return mask;
}
}
return 0;
}
// --------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------
// Get the capslock xkb mask modifier
// --------------------------------------------------------------------------------------
unsigned int xkb_capslock_mask() {
return LockMask;
}
// --------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------
// Get the numlock xkb mask modifier
// (code taken from numlockx)
// --------------------------------------------------------------------------------------
unsigned int xkb_numlock_mask() {
XkbDescPtr xkb;
if(( xkb = XkbGetKeyboard(display, XkbAllComponentsMask, XkbUseCoreKbd )) != NULL ) {
unsigned int mask = xkb_mask_modifier( xkb, "NumLock" );
XkbFreeKeyboard( xkb, 0, True );
return mask;
}
return 0;
}
// --------------------------------------------------------------------------------------
// --------------------------------------------------------------------------------------
// Get the scroll lock xkb mask modifier
// (code taken from numlockx and modified)
// --------------------------------------------------------------------------------------
unsigned int xkb_scrolllock_mask() {
XkbDescPtr xkb;
if(( xkb = XkbGetKeyboard(display, XkbAllComponentsMask, XkbUseCoreKbd )) != NULL ) {
unsigned int mask = xkb_mask_modifier( xkb, "ScrollLock" );
XkbFreeKeyboard( xkb, 0, True );
return mask;
}
return 0;
}
// --------------------------------------------------------------------------------------
int find_keyboards() {
int i, j;
int fd;
char name[256] = "Unknown";
keyboard_fd_num = 0;
for (i=0; i<MAX_KEYBOARDS; i++) {
keyboard_fds[i] = 0;
}
for (i=0; i<MAX_INPUT_NODE; i++) {
snprintf(filename, sizeof(filename), "/dev/input/event%d", i);
fd = open(filename, O_RDWR|O_SYNC);
if (fd >= 0) {
ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(key_bitmask)), key_bitmask);
// Ensure that we do not detect tsak faked keyboards
ioctl (fd, EVIOCGNAME(sizeof(name)), name);
if (str_ends_with(name, "+tsak") == 0) {
struct input_id input_info;
ioctl (fd, EVIOCGID, &input_info);
if ((input_info.vendor != 0) && (input_info.product != 0)) {
/* We assume that anything that has an alphabetic key in the
QWERTYUIOP range in it is the main keyboard. */
for (j = KEY_Q; j <= KEY_P; j++) {
if (TestBit(j, key_bitmask)) {
keyboard_fds[keyboard_fd_num] = fd;
}
}
}
}
if (keyboard_fds[keyboard_fd_num] == 0) {
close(fd);
}
else {
keyboard_fd_num++;
}
}
}
return 0;
}
void handle_sigterm(int signum) {
if (lockfd >= 0) {
releaseLock(lockfd, lockFileName);
}
exit(0);
}
int main() {
int current_keyboard;
char name[256] = "Unknown";
unsigned int states;
struct input_event ev;
struct vt_stat vtstat;
int vt_fd;
int x11_vt_num = -1;
// XEvent xev;
XkbStateRec state;
bool num_lock_set = false;
bool caps_lock_set = false;
bool scroll_lock_set = false;
int num_lock_mask;
int caps_lock_mask;
int scroll_lock_mask;
int evBase;
int errBase;
// Register cleanup handlers
struct sigaction action;
memset(&action, 0, sizeof(struct sigaction));
action.sa_handler = handle_sigterm;
sigaction(SIGTERM, &action, NULL);
// Open X11 display
display = XOpenDisplay(NULL);
if (!display) {
printf ("[tdekbdledsync] Unable to open X11 display!\n");
return -1;
}
// Ensure only one process is running on a given display
sprintf(lockFileName, "/var/lock/tdekbdledsync-%s.lock", XDisplayString(display));
lockfd = tryGetLock(lockFileName);
if (lockfd < 0) {
printf ("[tdekbdledsync] Another instance of this program is already running on this X11 display!\n[tdekbdledsync] Lockfile detected at '%s'\n", lockFileName);
return -2;
}
// Set up Xkb extension
int i1, mn, mj;
mj = XkbMajorVersion;
mn = XkbMinorVersion;
if (!XkbQueryExtension(display, &i1, &evBase, &errBase, &mj, &mn)) {
printf("[tdekbdledsync] Server doesn't support a compatible XKB\n");
releaseLock(lockfd, lockFileName);
return -3;
}
XkbSelectEvents(display, XkbUseCoreKbd, XkbStateNotifyMask, XkbStateNotifyMask);
// Get X server VT number
x11_vt_num = get_x_vtnum(display);
// Open console socket
vt_fd = getfd(NULL);
// Monitor for hotplugged keyboards
struct udev *udev;
struct udev_device *dev;
struct udev_monitor *mon;
struct timeval tv;
// Create the udev object
udev = udev_new();
if (!udev) {
printf("[tdekbdledsync] Cannot connect to udev interface\n");
releaseLock(lockfd, lockFileName);
return -4;
}
// Set up a udev monitor to monitor input devices
mon = udev_monitor_new_from_netlink(udev, "udev");
udev_monitor_filter_add_match_subsystem_devtype(mon, "input", NULL);
udev_monitor_enable_receiving(mon);
while (1) {
// Get masks
num_lock_mask = xkb_numlock_mask();
caps_lock_mask = xkb_capslock_mask();
scroll_lock_mask = xkb_scrolllock_mask();
// Find keyboards
find_keyboards();
if (keyboard_fd_num == 0) {
printf ("[tdekbdledsync] Could not find any usable keyboard(s)!\n");
releaseLock(lockfd, lockFileName);
return -5;
}
else {
fprintf(stderr, "[tdekbdledsync] Found %d keyboard(s)\n", keyboard_fd_num);
for (current_keyboard=0;current_keyboard<keyboard_fd_num;current_keyboard++) {
// Print device name
ioctl(keyboard_fds[current_keyboard], EVIOCGNAME (sizeof (name)), name);
fprintf(stderr, "[tdekbdledsync] Syncing keyboard: (%s)\n", name);
}
while (1) {
// Get current active VT
if (ioctl(vt_fd, VT_GETSTATE, &vtstat)) {
fprintf(stderr, "[tdekbdledsync] Unable to get current VT!\n");
releaseLock(lockfd, lockFileName);
return -6;
}
if (x11_vt_num == vtstat.v_active) {
// Get Virtual Core keyboard status
if (XkbGetIndicatorState(display, XkbUseCoreKbd, &states) != Success) {
fprintf(stderr, "[tdekbdledsync] Unable to query X11 Virtual Core keyboard!\n");
releaseLock(lockfd, lockFileName);
return -7;
}
XkbGetState(display, XkbUseCoreKbd, &state);
caps_lock_set = (state.mods & caps_lock_mask);
num_lock_set = (state.mods & num_lock_mask);
scroll_lock_set = (state.mods & scroll_lock_mask);
for (current_keyboard=0;current_keyboard<keyboard_fd_num;current_keyboard++) {
// Set LEDs
ev.type = EV_LED;
ev.code = LED_CAPSL;
ev.value = caps_lock_set;
if (write(keyboard_fds[current_keyboard], &ev, sizeof(ev)) < 0) {
fprintf(stderr, "[tdekbdledsync] Unable to set LED state\n");
}
ev.type = EV_LED;
ev.code = LED_NUML;
ev.value = num_lock_set;
if (write(keyboard_fds[current_keyboard], &ev, sizeof(ev)) < 0) {
fprintf(stderr, "[tdekbdledsync] Unable to set LED state\n");
}
ev.type = EV_LED;
ev.code = LED_SCROLLL;
ev.value = scroll_lock_set;
if (write(keyboard_fds[current_keyboard], &ev, sizeof(ev)) < 0) {
fprintf(stderr, "[tdekbdledsync] Unable to set LED state\n");
}
}
}
else {
// Ensure the X server is still alive
// If the X server has terminated, this will fail and the program will terminate
XSync(display, False);
}
// Check the hotplug monitoring process to see if any keyboards were added or removed
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(udev_monitor_get_fd(mon), &readfds);
tv.tv_sec = 0;
tv.tv_usec = 0;
int fdcount = select(udev_monitor_get_fd(mon)+1, &readfds, NULL, NULL, &tv);
if (fdcount < 0) {
if (errno == EINTR) {
fprintf(stderr, "[tdekbdledsync] Signal caught in hotplug monitoring process; ignoring\n");
}
else {
fprintf(stderr, "[tdekbdledsync] Select failed on udev file descriptor in hotplug monitoring process\n");
}
}
else {
dev = udev_monitor_receive_device(mon);
if (dev) {
if (strcmp(udev_device_get_action(dev), "add") == 0) {
// Reload keyboards
break;
}
if (strcmp(udev_device_get_action(dev), "remove") == 0) {
// Reload keyboards
break;
}
}
}
// Poll
usleep(250*1000);
// // Wait for an Xkb event
// // FIXME
// // This prevents the udev hotplug monitor from working, as XNextEvent does not stop blocking when a keyboard hotplug occurs
// while (1) {
// XNextEvent(display, &xev);
// if (xev.type == evBase + XkbEventCode) {
// XkbEvent *xkb_event = reinterpret_cast<XkbEvent*>(&xev);
// if (xkb_event->any.xkb_type & XkbStateNotify) {
// if ((xkb_event->state.changed & XkbModifierStateMask) || (xkb_event->state.changed & XkbModifierBaseMask)) {
// // Modifier state has changed
// // Synchronize keyboard indicators
// break;
// }
// }
// }
// }
}
}
// Close all keyboard file descriptors
for (int current_keyboard=0;current_keyboard<keyboard_fd_num;current_keyboard++) {
close(keyboard_fds[current_keyboard]);
}
}
releaseLock(lockfd, lockFileName);
return 0;
}