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#include "keyboard_event.h"
/* C stdlib */
#include <stdio.h>
#include <stdint.h>
#include <string.h>
/* POSIX */
#include <unistd.h>
#include <dlfcn.h>
typedef struct {
uint32_t key;
uint32_t modifiers; /* keyboard_modkeys bitmask */
const char *action;
} global_hotkey;
#define NUM_GLOBAL_HOTKEYS 6
static global_hotkey global_hotkeys[NUM_GLOBAL_HOTKEYS] = {
{ .key = KEY_Z, .modifiers = KEYBOARD_MODKEY_LALT, .action = "show_hide" },
{ .key = KEY_F9, .modifiers = KEYBOARD_MODKEY_LALT, .action = "record" },
{ .key = KEY_F7, .modifiers = KEYBOARD_MODKEY_LALT, .action = "pause" },
{ .key = KEY_F8, .modifiers = KEYBOARD_MODKEY_LALT, .action = "stream" },
{ .key = KEY_F10, .modifiers = KEYBOARD_MODKEY_LALT | KEYBOARD_MODKEY_SHIFT, .action = "replay_start" },
{ .key = KEY_F10, .modifiers = KEYBOARD_MODKEY_LALT, .action = "replay_save" }
};
static bool on_key_callback(uint32_t key, uint32_t modifiers, int press_status, void *userdata) {
(void)userdata;
for(int i = 0; i < NUM_GLOBAL_HOTKEYS; ++i) {
if(key == global_hotkeys[i].key && modifiers == global_hotkeys[i].modifiers) {
if(press_status == 1) { /* 1 == Pressed */
puts(global_hotkeys[i].action);
fflush(stdout);
}
return false;
}
}
return true;
}
static void usage(void) {
fprintf(stderr, "usage: gsr-global-hotkeys [--all|--virtual]\n");
fprintf(stderr, "OPTIONS:\n");
fprintf(stderr, " --all Grab all devices.\n");
fprintf(stderr, " --virtual Grab all virtual devices only.\n");
}
typedef void* (*XOpenDisplay_FUNC)(const char*);
typedef int (*XErrorHandler_FUNC)(void *display, void* error_event);
typedef XErrorHandler_FUNC (*XSetErrorHandler_FUNC)(XErrorHandler_FUNC handler);
static int x_ignore_error(void *display, void *ee) {
(void)display;
(void)ee;
return 0;
}
static x11_context setup_x11_context(void) {
x11_context x_context = {0};
XSetErrorHandler_FUNC XSetErrorHandler = NULL;
void *x11_lib = dlopen("libX11.so.6", RTLD_LAZY);
if(!x11_lib) {
fprintf(stderr, "Warning: dlopen libX11.so.6 failed\n");
return x_context;
}
XOpenDisplay_FUNC XOpenDisplay = dlsym(x11_lib, "XOpenDisplay");
if(!XOpenDisplay) {
fprintf(stderr, "Warning: dlsym XOpenDisplay failed\n");
goto fail;
}
x_context.XKeycodeToKeysym = dlsym(x11_lib, "XKeycodeToKeysym");
if(!x_context.XKeycodeToKeysym) {
fprintf(stderr, "Warning: dlsym XKeycodeToKeysym failed\n");
goto fail;
}
x_context.XPending = dlsym(x11_lib, "XPending");
if(!x_context.XPending) {
fprintf(stderr, "Warning: dlsym XPending failed\n");
goto fail;
}
x_context.XNextEvent = dlsym(x11_lib, "XNextEvent");
if(!x_context.XNextEvent) {
fprintf(stderr, "Warning: dlsym XNextEvent failed\n");
goto fail;
}
x_context.XRefreshKeyboardMapping = dlsym(x11_lib, "XRefreshKeyboardMapping");
if(!x_context.XRefreshKeyboardMapping) {
fprintf(stderr, "Warning: dlsym XRefreshKeyboardMapping failed\n");
goto fail;
}
x_context.display = XOpenDisplay(NULL);
if(!x_context.display) {
fprintf(stderr, "Warning: XOpenDisplay failed\n");
goto fail;
}
XSetErrorHandler = dlsym(x11_lib, "XSetErrorHandler");
if(XSetErrorHandler)
XSetErrorHandler(x_ignore_error);
else
fprintf(stderr, "Warning: dlsym XSetErrorHandler failed\n");
return x_context;
fail:
memset(&x_context, 0, sizeof(x_context));
dlclose(x11_lib);
return x_context;
}
int main(int argc, char **argv) {
keyboard_grab_type grab_type = KEYBOARD_GRAB_TYPE_ALL;
if(argc == 2) {
const char *grab_type_arg = argv[1];
if(strcmp(grab_type_arg, "--all") == 0) {
grab_type = KEYBOARD_GRAB_TYPE_ALL;
} else if(strcmp(grab_type_arg, "--virtual") == 0) {
grab_type = KEYBOARD_GRAB_TYPE_VIRTUAL;
} else {
fprintf(stderr, "Error: expected --all or --virtual, got %s\n", grab_type_arg);
usage();
return 1;
}
} else if(argc != 1) {
fprintf(stderr, "Error: expected 0 or 1 arguments, got %d argument(s)\n", argc);
usage();
return 1;
}
x11_context x_context = setup_x11_context();
const uid_t user_id = getuid();
if(geteuid() != 0) {
if(setuid(0) == -1) {
fprintf(stderr, "Error: failed to change user to root\n");
return 1;
}
}
keyboard_event keyboard_ev;
if(!keyboard_event_init(&keyboard_ev, true, true, grab_type, x_context)) {
fprintf(stderr, "Error: failed to setup hotplugging and no keyboard input devices were found\n");
setuid(user_id);
return 1;
}
fprintf(stderr, "Info: global hotkeys setup, waiting for hotkeys to be pressed\n");
for(;;) {
keyboard_event_poll_events(&keyboard_ev, -1, on_key_callback, NULL);
if(keyboard_event_stdout_has_failed(&keyboard_ev)) {
fprintf(stderr, "Info: stdout closed (parent process likely closed this process), exiting...\n");
break;
}
}
keyboard_event_deinit(&keyboard_ev);
setuid(user_id);
return 0;
}
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