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gohook/hook/darwin/hook_c.h
vcaesar e6086cbf68 update code style
2020-06-29 11:50:14 -04:00

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/* Copyright (C) 2006-2017 Alexander Barker.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifndef USE_WEAK_IMPORT
#include <dlfcn.h>
#endif
#include <mach/mach_time.h>
#ifdef USE_OBJC
#include <objc/objc.h>
#include <objc/objc-runtime.h>
#endif
#include <pthread.h>
#include <stdbool.h>
#include <sys/time.h>
#include "../iohook.h"
// #include "../logger_c.h"
#include "input.h"
typedef struct _hook_info {
CFMachPortRef port;
CFRunLoopSourceRef source;
CFRunLoopObserverRef observer;
} hook_info;
#ifdef USE_OBJC
static id auto_release_pool;
#endif
// Event runloop reference.
CFRunLoopRef event_loop;
// Flag to restart the event tap incase of timeout.
static Boolean restart_tap = false;
// Modifiers for tracking key masks.
static uint16_t current_modifiers = 0x0000;
// Required to transport messages between the main runloop and our thread for
// Unicode lookups.
#define KEY_BUFFER_SIZE 4
typedef struct {
CGEventRef event;
UniChar buffer[KEY_BUFFER_SIZE];
UniCharCount length;
} TISMessage;
TISMessage *tis_message;
#ifdef USE_WEAK_IMPORT
// Required to dynamically check for AXIsProcessTrustedWithOptions availability.
extern void dispatch_get_main_queue() __attribute__((weak_import));
extern void dispatch_sync_f(dispatch_queue_t queue, void *context, void (*function)(void *)) __attribute__((weak_import));
#else
#if __MAC_OS_X_VERSION_MAX_ALLOWED <= 1050
typedef void* dispatch_queue_t;
#endif
static dispatch_queue_t (*dispatch_get_main_queue_f)();
static void (*dispatch_sync_f_f)(dispatch_queue_t, void *, void (*function)(void *));
#endif
#if ! defined(USE_CARBON_LEGACY) && defined(USE_COREFOUNDATION)
static CFRunLoopSourceRef src_msg_port;
static CFRunLoopObserverRef observer;
static pthread_cond_t msg_port_cond = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t msg_port_mutex = PTHREAD_MUTEX_INITIALIZER;
#endif
// Click count globals.
static unsigned short click_count = 0;
static CGEventTimestamp click_time = 0;
static unsigned short int click_button = MOUSE_NOBUTTON;
static bool mouse_dragged = false;
// Structure for the current Unix epoch in milliseconds.
static struct timeval system_time;
// Virtual event pointer.
static iohook_event event;
// Event dispatch callback.
static dispatcher_t dispatcher = NULL;
IOHOOK_API void hook_set_dispatch_proc(dispatcher_t dispatch_proc) {
logger(LOG_LEVEL_DEBUG, "%s [%u]: Setting new dispatch callback to %#p.\n",
__FUNCTION__, __LINE__, dispatch_proc);
dispatcher = dispatch_proc;
}
// Send out an event if a dispatcher was set.
static inline void dispatch_event(iohook_event *const event) {
if (dispatcher != NULL) {
logger(LOG_LEVEL_DEBUG, "%s [%u]: Dispatching event type %u.\n",
__FUNCTION__, __LINE__, event->type);
dispatcher(event);
} else {
logger(LOG_LEVEL_WARN, "%s [%u]: No dispatch callback set!\n",
__FUNCTION__, __LINE__);
}
}
// Set the native modifier mask for future events.
static inline void set_modifier_mask(uint16_t mask) {
current_modifiers |= mask;
}
// Unset the native modifier mask for future events.
static inline void unset_modifier_mask(uint16_t mask) {
current_modifiers ^= mask;
}
// Get the current native modifier mask state.
static inline uint16_t get_modifiers() {
return current_modifiers;
}
// Initialize the modifier mask to the current modifiers.
static void initialize_modifiers() {
current_modifiers = 0x0000;
if (CGEventSourceKeyState(kCGEventSourceStateCombinedSessionState, kVK_Shift)) {
set_modifier_mask(MASK_SHIFT_L);
}
if (CGEventSourceKeyState(kCGEventSourceStateCombinedSessionState, kVK_RightShift)) {
set_modifier_mask(MASK_SHIFT_R);
}
if (CGEventSourceKeyState(kCGEventSourceStateCombinedSessionState, kVK_Control)) {
set_modifier_mask(MASK_CTRL_L);
}
if (CGEventSourceKeyState(kCGEventSourceStateCombinedSessionState, kVK_RightControl)) {
set_modifier_mask(MASK_CTRL_R);
}
if (CGEventSourceKeyState(kCGEventSourceStateCombinedSessionState, kVK_Option)) {
set_modifier_mask(MASK_ALT_L);
}
if (CGEventSourceKeyState(kCGEventSourceStateCombinedSessionState, kVK_RightOption)) {
set_modifier_mask(MASK_ALT_R);
}
if (CGEventSourceKeyState(kCGEventSourceStateCombinedSessionState, kVK_Command)) {
set_modifier_mask(MASK_META_L);
}
if (CGEventSourceKeyState(kCGEventSourceStateCombinedSessionState, kVK_RightCommand)) {
set_modifier_mask(MASK_META_R);
}
if (CGEventSourceButtonState(kCGEventSourceStateCombinedSessionState, kVK_LBUTTON)) {
set_modifier_mask(MASK_BUTTON1);
}
if (CGEventSourceButtonState(kCGEventSourceStateCombinedSessionState, kVK_RBUTTON)) {
set_modifier_mask(MASK_BUTTON2);
}
if (CGEventSourceButtonState(kCGEventSourceStateCombinedSessionState, kVK_MBUTTON)) {
set_modifier_mask(MASK_BUTTON3);
}
if (CGEventSourceButtonState(kCGEventSourceStateCombinedSessionState, kVK_XBUTTON1)) {
set_modifier_mask(MASK_BUTTON4);
}
if (CGEventSourceButtonState(kCGEventSourceStateCombinedSessionState, kVK_XBUTTON2)) {
set_modifier_mask(MASK_BUTTON5);
}
if (CGEventSourceFlagsState(kCGEventSourceStateCombinedSessionState) & kCGEventFlagMaskAlphaShift) {
set_modifier_mask(MASK_CAPS_LOCK);
}
// Best I can tell, OS X does not support Num or Scroll lock.
unset_modifier_mask(MASK_NUM_LOCK);
unset_modifier_mask(MASK_SCROLL_LOCK);
}
// Wrap keycode_to_unicode with some null checks.
static void keycode_to_lookup(void *info) {
TISMessage *data = (TISMessage *) info;
if (data != NULL && data->event != NULL) {
// Preform Unicode lookup.
data->length = keycode_to_unicode(data->event, data->buffer, KEY_BUFFER_SIZE);
}
}
#if ! defined(USE_CARBON_LEGACY) && defined(USE_COREFOUNDATION)
void message_port_status_proc(CFRunLoopObserverRef observer, CFRunLoopActivity activity, void *info) {
switch (activity) {
case kCFRunLoopExit:
// Acquire a lock on the msg_port and signal that anyone waiting
// should continue.
pthread_mutex_lock(&msg_port_mutex);
pthread_cond_broadcast(&msg_port_cond);
pthread_mutex_unlock(&msg_port_mutex);
break;
default:
logger(LOG_LEVEL_WARN, "%s [%u]: Unhandled RunLoop activity! (%#X)\n",
__FUNCTION__, __LINE__, (unsigned int) activity);
break;
}
}
// Runloop to execute KeyCodeToString on the "Main" runloop due to an
// undocumented thread safety requirement.
static void message_port_proc(void *info) {
// Lock the msg_port mutex as we enter the main runloop.
pthread_mutex_lock(&msg_port_mutex);
keycode_to_lookup(info);
// Unlock the msg_port mutex to signal to the hook_thread that we have
// finished on the main runloop.
pthread_cond_broadcast(&msg_port_cond);
pthread_mutex_unlock(&msg_port_mutex);
}
static int start_message_port_runloop() {
int status = IOHOOK_FAILURE;
if (tis_message != NULL) {
// Create a runloop observer for the main runloop.
observer = CFRunLoopObserverCreate(
kCFAllocatorDefault,
kCFRunLoopExit, //kCFRunLoopEntry | kCFRunLoopExit, //kCFRunLoopAllActivities,
true,
0,
message_port_status_proc,
NULL
);
if (observer != NULL) {
pthread_mutex_lock(&msg_port_mutex);
CFRunLoopSourceContext context = {
.version = 0,
.info = tis_message,
.retain = NULL,
.release = NULL,
.copyDescription = NULL,
.equal = NULL,
.hash = NULL,
.schedule = NULL,
.cancel = NULL,
.perform = message_port_proc
};
CFRunLoopRef main_loop = CFRunLoopGetMain();
src_msg_port = CFRunLoopSourceCreate(kCFAllocatorDefault, 0, &context);
if (src_msg_port != NULL) {
CFRunLoopAddSource(main_loop, src_msg_port, kCFRunLoopDefaultMode);
CFRunLoopAddObserver(main_loop, observer, kCFRunLoopDefaultMode);
logger(LOG_LEVEL_DEBUG, "%s [%u]: Successful.\n",
__FUNCTION__, __LINE__);
status = IOHOOK_SUCCESS;
} else {
logger(LOG_LEVEL_ERROR, "%s [%u]: CFRunLoopSourceCreate failure!\n",
__FUNCTION__, __LINE__);
status = IOHOOK_ERROR_CREATE_RUN_LOOP_SOURCE;
}
pthread_mutex_unlock(&msg_port_mutex);
} else {
logger(LOG_LEVEL_ERROR, "%s [%u]: CFRunLoopObserverCreate failure!\n",
__FUNCTION__, __LINE__);
status = IOHOOK_ERROR_CREATE_OBSERVER;
}
} else {
logger(LOG_LEVEL_ERROR, "%s [%u]: No available TIS Message pointer.\n",
__FUNCTION__, __LINE__);
}
return status;
}
static void stop_message_port_runloop() {
CFRunLoopRef main_loop = CFRunLoopGetMain();
if (CFRunLoopContainsObserver(main_loop, observer, kCFRunLoopDefaultMode)) {
CFRunLoopRemoveObserver(main_loop, observer, kCFRunLoopDefaultMode);
CFRunLoopObserverInvalidate(observer);
}
if (CFRunLoopContainsSource(main_loop, src_msg_port, kCFRunLoopDefaultMode)) {
CFRunLoopRemoveSource(main_loop, src_msg_port, kCFRunLoopDefaultMode);
CFRelease(src_msg_port);
}
observer = NULL;
src_msg_port = NULL;
logger(LOG_LEVEL_DEBUG, "%s [%u]: Successful.\n",
__FUNCTION__, __LINE__);
}
#endif
static void hook_status_proc(CFRunLoopObserverRef observer, CFRunLoopActivity activity, void *info) {
uint64_t timestamp = mach_absolute_time();
switch (activity) {
case kCFRunLoopEntry:
// Populate the hook start event.
event.time = timestamp;
event.reserved = 0x00;
event.type = EVENT_HOOK_ENABLED;
event.mask = 0x00;
// Fire the hook start event.
dispatch_event(&event);
break;
case kCFRunLoopExit:
// Populate the hook stop event.
event.time = timestamp;
event.reserved = 0x00;
event.type = EVENT_HOOK_DISABLED;
event.mask = 0x00;
// Fire the hook stop event.
dispatch_event(&event);
break;
default:
logger(LOG_LEVEL_WARN, "%s [%u]: Unhandled RunLoop activity! (%#X)\n",
__FUNCTION__, __LINE__, (unsigned int) activity);
break;
}
}
static inline void process_key_pressed(uint64_t timestamp, CGEventRef event_ref) {
UInt64 keycode = CGEventGetIntegerValueField(event_ref, kCGKeyboardEventKeycode);
// Populate key pressed event.
event.time = timestamp;
event.reserved = 0x00;
event.type = EVENT_KEY_PRESSED;
event.mask = get_modifiers();
event.data.keyboard.keycode = keycode_to_scancode(keycode);
event.data.keyboard.rawcode = keycode;
event.data.keyboard.keychar = CHAR_UNDEFINED;
logger(LOG_LEVEL_INFO, "%s [%u]: Key %#X pressed. (%#X)\n",
__FUNCTION__, __LINE__, event.data.keyboard.keycode, event.data.keyboard.rawcode);
// Fire key pressed event.
dispatch_event(&event);
// If the pressed event was not consumed...
if (event.reserved ^ 0x01) {
tis_message->event = event_ref;
tis_message->length = 0;
bool is_runloop_main = CFEqual(event_loop, CFRunLoopGetMain());
#ifdef USE_WEAK_IMPORT
if (dispatch_sync_f != NULL && dispatch_get_main_queue != NULL && !is_runloop_main) {
logger(LOG_LEVEL_DEBUG, "%s [%u]: Using dispatch_sync_f for key typed events.\n", __FUNCTION__, __LINE__);
dispatch_sync_f(dispatch_get_main_queue(), tis_message, &keycode_to_lookup);
}
#else
if (dispatch_sync_f_f != NULL && dispatch_get_main_queue_f != NULL && !is_runloop_main) {
logger(LOG_LEVEL_DEBUG, "%s [%u]: Using *dispatch_sync_f_f for key typed events.\n", __FUNCTION__, __LINE__);
(*dispatch_sync_f_f)((*dispatch_get_main_queue_f)(), tis_message, &keycode_to_lookup);
}
#endif
#if ! defined(USE_CARBON_LEGACY) && defined(USE_COREFOUNDATION)
else if (!is_runloop_main) {
// Lock for code dealing with the main runloop.
pthread_mutex_lock(&msg_port_mutex);
// Check to see if the main runloop is still running.
// TOOD I would rather this be a check on hook_enable(),
// but it makes the usage complicated by requiring a separate
// thread for the main runloop and hook registration.
CFStringRef mode = CFRunLoopCopyCurrentMode(CFRunLoopGetMain());
if (mode != NULL) {
CFRelease(mode);
// Lookup the Unicode representation for this event.
//CFRunLoopSourceContext context = { .version = 0 };
//CFRunLoopSourceGetContext(src_msg_port, &context);
// Get the run loop context info pointer.
//TISMessage *info = (TISMessage *) context.info;
// Set the event pointer.
//info->event = event_ref;
// Signal the custom source and wakeup the main runloop.
CFRunLoopSourceSignal(src_msg_port);
CFRunLoopWakeUp(CFRunLoopGetMain());
// Wait for a lock while the main runloop processes they key typed event.
pthread_cond_wait(&msg_port_cond, &msg_port_mutex);
} else {
logger(LOG_LEVEL_WARN, "%s [%u]: Failed to signal RunLoop main!\n",
__FUNCTION__, __LINE__);
}
// Unlock for code dealing with the main runloop.
pthread_mutex_unlock(&msg_port_mutex);
}
#endif
else {
keycode_to_lookup(tis_message);
}
unsigned int i;
for (i= 0; i < tis_message->length; i++) {
// Populate key typed event.
event.time = timestamp;
event.reserved = 0x00;
event.type = EVENT_KEY_TYPED;
event.mask = get_modifiers();
event.data.keyboard.keycode = VC_UNDEFINED;
event.data.keyboard.rawcode = keycode;
event.data.keyboard.keychar = tis_message->buffer[i];
logger(LOG_LEVEL_INFO, "%s [%u]: Key %#X typed. (%lc)\n",
__FUNCTION__, __LINE__, event.data.keyboard.keycode,
(wint_t) event.data.keyboard.keychar);
// Populate key typed event.
dispatch_event(&event);
}
}
}
static inline void process_key_released(uint64_t timestamp, CGEventRef event_ref) {
UInt64 keycode = CGEventGetIntegerValueField(event_ref, kCGKeyboardEventKeycode);
// Populate key released event.
event.time = timestamp;
event.reserved = 0x00;
event.type = EVENT_KEY_RELEASED;
event.mask = get_modifiers();
event.data.keyboard.keycode = keycode_to_scancode(keycode);
event.data.keyboard.rawcode = keycode;
event.data.keyboard.keychar = CHAR_UNDEFINED;
logger(LOG_LEVEL_INFO, "%s [%u]: Key %#X released. (%#X)\n",
__FUNCTION__, __LINE__, event.data.keyboard.keycode, event.data.keyboard.rawcode);
// Fire key released event.
dispatch_event(&event);
}
static inline void process_modifier_changed(uint64_t timestamp, CGEventRef event_ref) {
CGEventFlags event_mask = CGEventGetFlags(event_ref);
UInt64 keycode = CGEventGetIntegerValueField(event_ref, kCGKeyboardEventKeycode);
logger(LOG_LEVEL_INFO, "%s [%u]: Modifiers Changed for key %#X. (%#X)\n",
__FUNCTION__, __LINE__, (unsigned long) keycode, (unsigned int) event_mask);
/* Because Apple treats modifier keys differently than normal key
* events, any changes to the modifier keys will require a key state
* change to be fired manually.
*
* NOTE Left and right keyboard masks like NX_NEXTLSHIFTKEYMASK exist and
* appear to be in use on Darwin, however they are removed by comment or
* preprocessor with a note that reads "device-dependent (really?)." To
* ensure compatability, we will do this the verbose way.
*
* NOTE The masks for scroll and number lock are set in the key event.
*/
if (keycode == kVK_Shift) {
if (event_mask & kCGEventFlagMaskShift) {
// Process as a key pressed event.
set_modifier_mask(MASK_SHIFT_L);
process_key_pressed(timestamp, event_ref);
} else {
// Process as a key released event.
unset_modifier_mask(MASK_SHIFT_L);
process_key_released(timestamp, event_ref);
}
} else if (keycode == kVK_Control) {
if (event_mask & kCGEventFlagMaskControl) {
// Process as a key pressed event.
set_modifier_mask(MASK_CTRL_L);
process_key_pressed(timestamp, event_ref);
} else {
// Process as a key released event.
unset_modifier_mask(MASK_CTRL_L);
process_key_released(timestamp, event_ref);
}
} else if (keycode == kVK_Command) {
if (event_mask & kCGEventFlagMaskCommand) {
// Process as a key pressed event.
set_modifier_mask(MASK_META_L);
process_key_pressed(timestamp, event_ref);
} else {
// Process as a key released event.
unset_modifier_mask(MASK_META_L);
process_key_released(timestamp, event_ref);
}
} else if (keycode == kVK_Option) {
if (event_mask & kCGEventFlagMaskAlternate) {
// Process as a key pressed event.
set_modifier_mask(MASK_ALT_L);
process_key_pressed(timestamp, event_ref);
} else {
// Process as a key released event.
unset_modifier_mask(MASK_ALT_L);
process_key_released(timestamp, event_ref);
}
} else if (keycode == kVK_RightShift) {
if (event_mask & kCGEventFlagMaskShift) {
// Process as a key pressed event.
set_modifier_mask(MASK_SHIFT_R);
process_key_pressed(timestamp, event_ref);
} else {
// Process as a key released event.
unset_modifier_mask(MASK_SHIFT_R);
process_key_released(timestamp, event_ref);
}
} else if (keycode == kVK_RightControl) {
if (event_mask & kCGEventFlagMaskControl) {
// Process as a key pressed event.
set_modifier_mask(MASK_CTRL_R);
process_key_pressed(timestamp, event_ref);
} else {
// Process as a key released event.
unset_modifier_mask(MASK_CTRL_R);
process_key_released(timestamp, event_ref);
}
} else if (keycode == kVK_RightCommand) {
if (event_mask & kCGEventFlagMaskCommand) {
// Process as a key pressed event.
set_modifier_mask(MASK_META_R);
process_key_pressed(timestamp, event_ref);
} else {
// Process as a key released event.
unset_modifier_mask(MASK_META_R);
process_key_released(timestamp, event_ref);
}
} else if (keycode == kVK_RightOption) {
if (event_mask & kCGEventFlagMaskAlternate) {
// Process as a key pressed event.
set_modifier_mask(MASK_ALT_R);
process_key_pressed(timestamp, event_ref);
} else {
// Process as a key released event.
unset_modifier_mask(MASK_ALT_R);
process_key_released(timestamp, event_ref);
}
} else if (keycode == kVK_CapsLock) {
if (current_modifiers & MASK_CAPS_LOCK) {
// Process as a key pressed event.
unset_modifier_mask(MASK_CAPS_LOCK);
process_key_released(timestamp, event_ref);
} else {
// Process as a key released event.
set_modifier_mask(MASK_CAPS_LOCK);
process_key_pressed(timestamp, event_ref);
}
}
}
/* These events are totally undocumented for the CGEvent type, but are required to grab media and caps-lock keys.
*/
static inline void process_system_key(uint64_t timestamp, CGEventRef event_ref) {
if( CGEventGetType(event_ref) == NX_SYSDEFINED) {
#ifdef USE_OBJC
// Contributed by Iván Munsuri Ibáñez <munsuri@gmail.com>
id event_data = objc_msgSend((id) objc_getClass("NSEvent"), sel_registerName("eventWithCGEvent:"), event_ref);
int subtype = (int) objc_msgSend(event_data, sel_registerName("subtype"));
#else
CFDataRef data = CGEventCreateData(kCFAllocatorDefault, event_ref);
//CFIndex len = CFDataGetLength(data);
UInt8 *buffer = malloc(12);
// CFDataRef cf_data = CFDataCreate(NULL, [nsData bytes], [nsData length]);
CFDataGetBytes(data, CFRangeMake(108, 12), buffer);
UInt32 subtype = CFSwapInt32BigToHost(*((UInt32 *) buffer));
#endif
if (subtype == 8) {
#ifdef USE_OBJC
// int data = (int) objc_msgSend(event_data, sel_registerName("data1"));
uint16_t data = (uint16_t) objc_msgSend(event_data, sel_registerName("data1"))
#endif
// int
uint16_t key_code = ((uint16_t)data & 0xFFFF0000) >> 16;
uint16_t key_flags = ((uint16_t)data & 0xFFFF);
//int key_state = (key_flags & 0xFF00) >> 8;
bool key_down = (key_flags & 0x1) > 0;
if (key_code == NX_KEYTYPE_CAPS_LOCK) {
// It doesn't appear like we can modify the event coming in, so we will fabricate a new event.
CGEventSourceRef src = CGEventSourceCreate(kCGEventSourceStateHIDSystemState);
CGEventRef ns_event = CGEventCreateKeyboardEvent(src, kVK_CapsLock, key_down);
CGEventSetFlags(ns_event, CGEventGetFlags(event_ref));
if (key_down) {
process_key_pressed(timestamp, ns_event);
} else {
process_key_released(timestamp, ns_event);
}
CFRelease(ns_event);
CFRelease(src);
} else if (key_code == NX_KEYTYPE_SOUND_UP) {
// It doesn't appear like we can modify the event coming in, so we will fabricate a new event.
CGEventSourceRef src = CGEventSourceCreate(kCGEventSourceStateHIDSystemState);
CGEventRef ns_event = CGEventCreateKeyboardEvent(src, kVK_VolumeUp, key_down);
CGEventSetFlags(ns_event, CGEventGetFlags(event_ref));
if (key_down) {
process_key_pressed(timestamp, ns_event);
} else {
process_key_released(timestamp, ns_event);
}
CFRelease(ns_event);
CFRelease(src);
} else if (key_code == NX_KEYTYPE_SOUND_DOWN) {
// It doesn't appear like we can modify the event coming in, so we will fabricate a new event.
CGEventSourceRef src = CGEventSourceCreate(kCGEventSourceStateHIDSystemState);
CGEventRef ns_event = CGEventCreateKeyboardEvent(src, kVK_VolumeDown, key_down);
CGEventSetFlags(ns_event, CGEventGetFlags(event_ref));
if (key_down) {
process_key_pressed(timestamp, ns_event);
} else {
process_key_released(timestamp, ns_event);
}
CFRelease(ns_event);
CFRelease(src);
} else if (key_code == NX_KEYTYPE_MUTE) {
// It doesn't appear like we can modify the event coming in, so we will fabricate a new event.
CGEventSourceRef src = CGEventSourceCreate(kCGEventSourceStateHIDSystemState);
CGEventRef ns_event = CGEventCreateKeyboardEvent(src, kVK_Mute, key_down);
CGEventSetFlags(ns_event, CGEventGetFlags(event_ref));
if (key_down) {
process_key_pressed(timestamp, ns_event);
} else {
process_key_released(timestamp, ns_event);
}
CFRelease(ns_event);
CFRelease(src);
} else if (key_code == NX_KEYTYPE_EJECT) {
// It doesn't appear like we can modify the event coming in, so we will fabricate a new event.
CGEventSourceRef src = CGEventSourceCreate(kCGEventSourceStateHIDSystemState);
CGEventRef ns_event = CGEventCreateKeyboardEvent(src, kVK_NX_Eject, key_down);
CGEventSetFlags(ns_event, CGEventGetFlags(event_ref));
if (key_down) {
process_key_pressed(timestamp, ns_event);
} else {
process_key_released(timestamp, ns_event);
}
CFRelease(ns_event);
CFRelease(src);
} else if (key_code == NX_KEYTYPE_PLAY) {
// It doesn't appear like we can modify the event coming in, so we will fabricate a new event.
CGEventSourceRef src = CGEventSourceCreate(kCGEventSourceStateHIDSystemState);
CGEventRef ns_event = CGEventCreateKeyboardEvent(src, kVK_MEDIA_Play, key_down);
CGEventSetFlags(ns_event, CGEventGetFlags(event_ref));
if (key_down) {
process_key_pressed(timestamp, ns_event);
} else {
process_key_released(timestamp, ns_event);
}
CFRelease(ns_event);
CFRelease(src);
} else if (key_code == NX_KEYTYPE_FAST) {
// It doesn't appear like we can modify the event coming in, so we will fabricate a new event.
CGEventSourceRef src = CGEventSourceCreate(kCGEventSourceStateHIDSystemState);
CGEventRef ns_event = CGEventCreateKeyboardEvent(src, kVK_MEDIA_Next, key_down);
CGEventSetFlags(ns_event, CGEventGetFlags(event_ref));
if (key_down) {
process_key_pressed(timestamp, ns_event);
} else {
process_key_released(timestamp, ns_event);
}
CFRelease(ns_event);
CFRelease(src);
} else if (key_code == NX_KEYTYPE_REWIND) {
// It doesn't appear like we can modify the event coming in, so we will fabricate a new event.
CGEventSourceRef src = CGEventSourceCreate(kCGEventSourceStateHIDSystemState);
CGEventRef ns_event = CGEventCreateKeyboardEvent(src, kVK_MEDIA_Previous, key_down);
CGEventSetFlags(ns_event, CGEventGetFlags(event_ref));
if (key_down) {
process_key_pressed(timestamp, ns_event);
} else {
process_key_released(timestamp, ns_event);
}
CFRelease(ns_event);
CFRelease(src);
}
}
#ifndef USE_OBJC
free(buffer);
CFRelease(data);
#endif
}
}
static inline void process_button_pressed(uint64_t timestamp, CGEventRef event_ref, uint16_t button) {
// Track the number of clicks.
if (button == click_button && (long int) (timestamp - click_time) <= hook_get_multi_click_time()) {
if (click_count < USHRT_MAX) {
click_count++;
} else {
logger(LOG_LEVEL_WARN, "%s [%u]: Click count overflow detected!\n",
__FUNCTION__, __LINE__);
}
} else {
// Reset the click count.
click_count = 1;
// Set the previous button.
click_button = button;
}
// Save this events time to calculate the click_count.
click_time = timestamp;
CGPoint event_point = CGEventGetLocation(event_ref);
// Populate mouse pressed event.
event.time = timestamp;
event.reserved = 0x00;
event.type = EVENT_MOUSE_PRESSED;
event.mask = get_modifiers();
event.data.mouse.button = button;
event.data.mouse.clicks = click_count;
event.data.mouse.x = event_point.x;
event.data.mouse.y = event_point.y;
logger(LOG_LEVEL_INFO, "%s [%u]: Button %u pressed %u time(s). (%u, %u)\n",
__FUNCTION__, __LINE__, event.data.mouse.button, event.data.mouse.clicks,
event.data.mouse.x, event.data.mouse.y);
// Fire mouse pressed event.
dispatch_event(&event);
}
static inline void process_button_released(uint64_t timestamp, CGEventRef event_ref, uint16_t button) {
CGPoint event_point = CGEventGetLocation(event_ref);
// Populate mouse released event.
event.time = timestamp;
event.reserved = 0x00;
event.type = EVENT_MOUSE_RELEASED;
event.mask = get_modifiers();
event.data.mouse.button = button;
event.data.mouse.clicks = click_count;
event.data.mouse.x = event_point.x;
event.data.mouse.y = event_point.y;
logger(LOG_LEVEL_INFO, "%s [%u]: Button %u released %u time(s). (%u, %u)\n",
__FUNCTION__, __LINE__, event.data.mouse.button, event.data.mouse.clicks,
event.data.mouse.x, event.data.mouse.y);
// Fire mouse released event.
dispatch_event(&event);
// If the pressed event was not consumed...
if (event.reserved ^ 0x01 && mouse_dragged != true) {
// Populate mouse clicked event.
event.time = timestamp;
event.reserved = 0x00;
event.type = EVENT_MOUSE_CLICKED;
event.mask = get_modifiers();
event.data.mouse.button = button;
event.data.mouse.clicks = click_count;
event.data.mouse.x = event_point.x;
event.data.mouse.y = event_point.y;
logger(LOG_LEVEL_INFO, "%s [%u]: Button %u clicked %u time(s). (%u, %u)\n",
__FUNCTION__, __LINE__, event.data.mouse.button, event.data.mouse.clicks,
event.data.mouse.x, event.data.mouse.y);
// Fire mouse clicked event.
dispatch_event(&event);
}
// Reset the number of clicks.
if (button == click_button && (long int) (event.time - click_time) > hook_get_multi_click_time()) {
// Reset the click count.
click_count = 0;
}
}
static inline void process_mouse_moved(uint64_t timestamp, CGEventRef event_ref) {
// Reset the click count.
if (click_count != 0 && (long int) (timestamp - click_time) > hook_get_multi_click_time()) {
click_count = 0;
}
CGPoint event_point = CGEventGetLocation(event_ref);
// Populate mouse motion event.
event.time = timestamp;
event.reserved = 0x00;
if (mouse_dragged) {
event.type = EVENT_MOUSE_DRAGGED;
} else {
event.type = EVENT_MOUSE_MOVED;
}
event.mask = get_modifiers();
event.data.mouse.button = MOUSE_NOBUTTON;
event.data.mouse.clicks = click_count;
event.data.mouse.x = event_point.x;
event.data.mouse.y = event_point.y;
logger(LOG_LEVEL_INFO, "%s [%u]: Mouse %s to %u, %u.\n",
__FUNCTION__, __LINE__, mouse_dragged ? "dragged" : "moved",
event.data.mouse.x, event.data.mouse.y);
// Fire mouse motion event.
dispatch_event(&event);
}
static inline void process_mouse_wheel(uint64_t timestamp, CGEventRef event_ref) {
// Reset the click count and previous button.
click_count = 1;
click_button = MOUSE_NOBUTTON;
// Check to see what axis was rotated, we only care about axis 1 for vertical rotation.
// TODO Implement horizontal scrolling by examining axis 2.
// NOTE kCGScrollWheelEventDeltaAxis3 is currently unused.
if (CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventDeltaAxis1) != 0
|| CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventDeltaAxis2) != 0) {
CGPoint event_point = CGEventGetLocation(event_ref);
// Populate mouse wheel event.
event.time = timestamp;
event.reserved = 0x00;
event.type = EVENT_MOUSE_WHEEL;
event.mask = get_modifiers();
event.data.wheel.clicks = click_count;
event.data.wheel.x = event_point.x;
event.data.wheel.y = event_point.y;
// TODO Figure out if kCGScrollWheelEventDeltaAxis2 causes mouse events with zero rotation.
if (CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventIsContinuous) == 0) {
// Scrolling data is line-based.
event.data.wheel.type = WHEEL_BLOCK_SCROLL;
} else {
// Scrolling data is pixel-based.
event.data.wheel.type = WHEEL_UNIT_SCROLL;
}
// TODO The result of kCGScrollWheelEventIsContinuous may effect this value.
// Calculate the amount based on the Point Delta / Event Delta. Integer sign should always be homogeneous resulting in a positive result.
// NOTE kCGScrollWheelEventFixedPtDeltaAxis1 a floating point value (+0.1/-0.1) that takes acceleration into account.
// NOTE kCGScrollWheelEventPointDeltaAxis1 will not build on OS X < 10.5
if(CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventDeltaAxis1) != 0) {
event.data.wheel.amount = CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventPointDeltaAxis1) / CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventDeltaAxis1);
// Scrolling data uses a fixed-point 16.16 signed integer format (Ex: 1.0 = 0x00010000).
event.data.wheel.rotation = CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventDeltaAxis1) * -1;
} else if(CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventDeltaAxis2) != 0) {
event.data.wheel.amount = CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventPointDeltaAxis2) / CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventDeltaAxis2);
// Scrolling data uses a fixed-point 16.16 signed integer format (Ex: 1.0 = 0x00010000).
event.data.wheel.rotation = CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventDeltaAxis2) * -1;
} else {
//Fail Silently if a 3rd axis gets added without changing this section of code.
event.data.wheel.amount = 0;
event.data.wheel.rotation = 0;
}
if (CGEventGetIntegerValueField(event_ref, kCGScrollWheelEventDeltaAxis1) != 0) {
// Wheel Rotated Up or Down.
event.data.wheel.direction = WHEEL_VERTICAL_DIRECTION;
} else {
// data->event.u.u.detail == WheelLeft || data->event.u.u.detail == WheelRight
// Wheel Rotated Left or Right.
event.data.wheel.direction = WHEEL_HORIZONTAL_DIRECTION;
}
logger(LOG_LEVEL_INFO, "%s [%u]: Mouse wheel type %u, rotated %i units in the %u direction at %u, %u.\n",
__FUNCTION__, __LINE__, event.data.wheel.type,
event.data.wheel.amount * event.data.wheel.rotation,
event.data.wheel.direction,
event.data.wheel.x, event.data.wheel.y);
// Fire mouse wheel event.
dispatch_event(&event);
}
}
CGEventRef hook_event_proc(CGEventTapProxy tap_proxy, CGEventType type, CGEventRef event_ref, void *refcon) {
// Get the local system time in UTC.
gettimeofday(&system_time, NULL);
// Grab the native event timestap for use later..
uint64_t timestamp = (uint64_t) CGEventGetTimestamp(event_ref);
// Get the event class.
switch (type) {
case kCGEventKeyDown:
process_key_pressed(timestamp, event_ref);
break;
case kCGEventKeyUp:
process_key_released(timestamp, event_ref);
break;
case kCGEventFlagsChanged:
process_modifier_changed(timestamp, event_ref);
break;
// case NX_SYSDEFINED:
// process_system_key(timestamp, event_ref);
// break;
case kCGEventLeftMouseDown:
set_modifier_mask(MASK_BUTTON1);
process_button_pressed(timestamp, event_ref, MOUSE_BUTTON1);
break;
case kCGEventRightMouseDown:
set_modifier_mask(MASK_BUTTON2);
process_button_pressed(timestamp, event_ref, MOUSE_BUTTON2);
break;
case kCGEventOtherMouseDown:
// Extra mouse buttons.
if (CGEventGetIntegerValueField(event_ref, kCGMouseEventButtonNumber) < UINT16_MAX) {
uint16_t button = (uint16_t) CGEventGetIntegerValueField(event_ref, kCGMouseEventButtonNumber) + 1;
// Add support for mouse 4 & 5.
if (button == 4) {
set_modifier_mask(MOUSE_BUTTON4);
} else if (button == 5) {
set_modifier_mask(MOUSE_BUTTON5);
}
process_button_pressed(timestamp, event_ref, button);
}
break;
case kCGEventLeftMouseUp:
unset_modifier_mask(MASK_BUTTON1);
process_button_released(timestamp, event_ref, MOUSE_BUTTON1);
break;
case kCGEventRightMouseUp:
unset_modifier_mask(MASK_BUTTON2);
process_button_released(timestamp, event_ref, MOUSE_BUTTON2);
break;
case kCGEventOtherMouseUp:
// Extra mouse buttons.
if (CGEventGetIntegerValueField(event_ref, kCGMouseEventButtonNumber) < UINT16_MAX) {
uint16_t button = (uint16_t) CGEventGetIntegerValueField(event_ref, kCGMouseEventButtonNumber) + 1;
// Add support for mouse 4 & 5.
if (button == 4) {
unset_modifier_mask(MOUSE_BUTTON4);
} else if (button == 5) {
unset_modifier_mask(MOUSE_BUTTON5);
}
process_button_pressed(timestamp, event_ref, button);
}
break;
case kCGEventLeftMouseDragged:
case kCGEventRightMouseDragged:
case kCGEventOtherMouseDragged:
// FIXME The drag flag is confusing. Use prev x,y to determine click.
// Set the mouse dragged flag.
mouse_dragged = true;
process_mouse_moved(timestamp, event_ref);
break;
case kCGEventMouseMoved:
// Set the mouse dragged flag.
mouse_dragged = false;
process_mouse_moved(timestamp, event_ref);
break;
case kCGEventScrollWheel:
process_mouse_wheel(timestamp, event_ref);
break;
#ifdef USE_DEBUG
case kCGEventNull:
logger(LOG_LEVEL_DEBUG, "%s [%u]: Ignoring kCGEventNull.\n",
__FUNCTION__, __LINE__);
break;
#endif
default:
// Check for an old OS X bug where the tap seems to timeout for no reason.
// See: http://stackoverflow.com/questions/2969110/cgeventtapcreate-breaks-down-mysteriously-with-key-down-events#2971217
if (type == (CGEventType) kCGEventTapDisabledByTimeout) {
logger(LOG_LEVEL_WARN, "%s [%u]: CGEventTap timeout!\n",
__FUNCTION__, __LINE__);
// We need to restart the tap!
restart_tap = true;
CFRunLoopStop(CFRunLoopGetCurrent());
} else {
// In theory this *should* never execute.
logger(LOG_LEVEL_DEBUG, "%s [%u]: Unhandled Darwin event: %#X.\n",
__FUNCTION__, __LINE__, (unsigned int) type);
}
break;
}
CGEventRef result_ref = NULL;
if (event.reserved ^ 0x01) {
result_ref = event_ref;
} else {
logger(LOG_LEVEL_DEBUG, "%s [%u]: Consuming the current event. (%#X) (%#p)\n",
__FUNCTION__, __LINE__, type, event_ref);
}
return result_ref;
}
IOHOOK_API int hook_run() {
int status = IOHOOK_SUCCESS;
// Check for accessibility each time we start the loop.
if (is_accessibility_enabled()) {
logger(LOG_LEVEL_DEBUG, "%s [%u]: Accessibility API is enabled.\n",
__FUNCTION__, __LINE__);
do {
// Reset the restart flag...
restart_tap = false;
// Initialize starting modifiers.
initialize_modifiers();
// Try and allocate memory for hook_info.
hook_info *hook = malloc(sizeof(hook_info));
if (hook != NULL) {
// Setup the event mask to listen for.
#ifdef USE_DEBUG
CGEventMask event_mask = kCGEventMaskForAllEvents;
#else
CGEventMask event_mask = CGEventMaskBit(kCGEventKeyDown) |
CGEventMaskBit(kCGEventKeyUp) |
CGEventMaskBit(kCGEventFlagsChanged) |
CGEventMaskBit(kCGEventLeftMouseDown) |
CGEventMaskBit(kCGEventLeftMouseUp) |
CGEventMaskBit(kCGEventLeftMouseDragged) |
CGEventMaskBit(kCGEventRightMouseDown) |
CGEventMaskBit(kCGEventRightMouseUp) |
CGEventMaskBit(kCGEventRightMouseDragged) |
CGEventMaskBit(kCGEventOtherMouseDown) |
CGEventMaskBit(kCGEventOtherMouseUp) |
CGEventMaskBit(kCGEventOtherMouseDragged) |
CGEventMaskBit(kCGEventMouseMoved) |
CGEventMaskBit(kCGEventScrollWheel) |
// NOTE This event is undocumented and used
// for caps-lock release and multi-media keys.
CGEventMaskBit(NX_SYSDEFINED);
#endif
// Create the event tap.
hook->port = CGEventTapCreate(
kCGSessionEventTap, // kCGHIDEventTap
kCGHeadInsertEventTap, // kCGTailAppendEventTap
kCGEventTapOptionDefault, // kCGEventTapOptionListenOnly See Bug #22
event_mask,
hook_event_proc,
NULL);
if (hook->port != NULL) {
logger(LOG_LEVEL_DEBUG, "%s [%u]: CGEventTapCreate Successful.\n",
__FUNCTION__, __LINE__);
// Create the runloop event source from the event tap.
hook->source = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, hook->port, 0);
if (hook->source != NULL) {
logger(LOG_LEVEL_DEBUG, "%s [%u]: CFMachPortCreateRunLoopSource successful.\n",
__FUNCTION__, __LINE__);
event_loop = CFRunLoopGetCurrent();
if (event_loop != NULL) {
logger(LOG_LEVEL_DEBUG, "%s [%u]: CFRunLoopGetCurrent successful.\n",
__FUNCTION__, __LINE__);
// Create run loop observers.
hook->observer = CFRunLoopObserverCreate(
kCFAllocatorDefault,
kCFRunLoopEntry | kCFRunLoopExit, //kCFRunLoopAllActivities,
true,
0,
hook_status_proc,
NULL);
if (hook->observer != NULL) {
logger(LOG_LEVEL_DEBUG, "%s [%u]: CFRunLoopObserverCreate successful.\n",
__FUNCTION__, __LINE__);
tis_message = (TISMessage *) calloc(1, sizeof(TISMessage));
if (tis_message != NULL) {
if (! CFEqual(event_loop, CFRunLoopGetMain())) {
#ifdef USE_WEAK_IMPORT
if (dispatch_sync_f == NULL || dispatch_get_main_queue == NULL) {
#else
*(void **) (&dispatch_sync_f_f) = dlsym(RTLD_DEFAULT, "dispatch_sync_f");
const char *dlError = dlerror();
if (dlError != NULL) {
logger(LOG_LEVEL_DEBUG, "%s [%u]: %s.\n",
__FUNCTION__, __LINE__, dlError);
}
*(void **) (&dispatch_get_main_queue_f) = dlsym(RTLD_DEFAULT, "dispatch_get_main_queue");
dlError = dlerror();
if (dlError != NULL) {
logger(LOG_LEVEL_DEBUG, "%s [%u]: %s.\n",
__FUNCTION__, __LINE__, dlError);
}
if (dispatch_sync_f_f == NULL || dispatch_get_main_queue_f == NULL) {
#endif
logger(LOG_LEVEL_DEBUG, "%s [%u]: Failed to locate dispatch_sync_f() or dispatch_get_main_queue()!\n",
__FUNCTION__, __LINE__);
#if ! defined(USE_CARBON_LEGACY) && defined(USE_COREFOUNDATION)
logger(LOG_LEVEL_DEBUG, "%s [%u]: Falling back to runloop signaling.\n",
__FUNCTION__, __LINE__);
int runloop_status = start_message_port_runloop();
if (runloop_status != IOHOOK_SUCCESS) {
return runloop_status;
}
#endif
}
}
// Add the event source and observer to the runloop mode.
CFRunLoopAddSource(event_loop, hook->source, kCFRunLoopDefaultMode);
CFRunLoopAddObserver(event_loop, hook->observer, kCFRunLoopDefaultMode);
#ifdef USE_OBJC
// Create a garbage collector to handle Cocoa events correctly.
Class NSAutoreleasePool_class = (Class) objc_getClass("NSAutoreleasePool");
id pool = class_createInstance(NSAutoreleasePool_class, 0);
auto_release_pool = objc_msgSend(pool, sel_registerName("init"));
#endif
// Start the hook thread runloop.
CFRunLoopRun();
#ifdef USE_OBJC
//objc_msgSend(auto_release_pool, sel_registerName("drain"));
objc_msgSend(auto_release_pool, sel_registerName("release"));
#endif
// Lock back up until we are done processing the exit.
if (CFRunLoopContainsObserver(event_loop, hook->observer, kCFRunLoopDefaultMode)) {
CFRunLoopRemoveObserver(event_loop, hook->observer, kCFRunLoopDefaultMode);
}
if (CFRunLoopContainsSource(event_loop, hook->source, kCFRunLoopDefaultMode)) {
CFRunLoopRemoveSource(event_loop, hook->source, kCFRunLoopDefaultMode);
}
#if ! defined(USE_CARBON_LEGACY) && defined(USE_COREFOUNDATION)
if (! CFEqual(event_loop, CFRunLoopGetMain())) {
#ifdef USE_WEAK_IMPORT
if (dispatch_sync_f == NULL || dispatch_get_main_queue == NULL) {
#else
if (dispatch_sync_f_f == NULL || dispatch_get_main_queue_f == NULL) {
#endif
stop_message_port_runloop();
}
}
#endif
// Free the TIS Message.
free(tis_message);
} else {
logger(LOG_LEVEL_ERROR, "%s [%u]: Failed to allocate memory for TIS message structure!\n",
__FUNCTION__, __LINE__);
// Set the exit status.
status = IOHOOK_ERROR_OUT_OF_MEMORY;
}
// Invalidate and free hook observer.
CFRunLoopObserverInvalidate(hook->observer);
CFRelease(hook->observer);
} else {
// We cant do a whole lot of anything if we cant
// create run loop observer.
logger(LOG_LEVEL_ERROR, "%s [%u]: CFRunLoopObserverCreate failure!\n",
__FUNCTION__, __LINE__);
// Set the exit status.
status = IOHOOK_ERROR_CREATE_OBSERVER;
}
} else {
logger(LOG_LEVEL_ERROR, "%s [%u]: CFRunLoopGetCurrent failure!\n",
__FUNCTION__, __LINE__);
// Set the exit status.
status = IOHOOK_ERROR_GET_RUNLOOP;
}
// Clean up the event source.
CFRelease(hook->source);
} else {
logger(LOG_LEVEL_ERROR, "%s [%u]: CFMachPortCreateRunLoopSource failure!\n",
__FUNCTION__, __LINE__);
// Set the exit status.
status = IOHOOK_ERROR_CREATE_RUN_LOOP_SOURCE;
}
// Stop the CFMachPort from receiving any more messages.
CFMachPortInvalidate(hook->port);
CFRelease(hook->port);
} else {
logger(LOG_LEVEL_ERROR, "%s [%u]: Failed to create event port!\n",
__FUNCTION__, __LINE__);
// Set the exit status.
status = IOHOOK_ERROR_CREATE_EVENT_PORT;
}
// Free the hook structure.
free(hook);
} else {
status = IOHOOK_ERROR_OUT_OF_MEMORY;
}
} while (restart_tap);
} else {
logger(LOG_LEVEL_ERROR, "%s [%u]: Accessibility API is disabled!\n",
__FUNCTION__, __LINE__);
// Set the exit status.
status = IOHOOK_ERROR_AXAPI_DISABLED;
}
logger(LOG_LEVEL_DEBUG, "%s [%u]: Something, something, something, complete.\n",
__FUNCTION__, __LINE__);
return status;
}
IOHOOK_API int hook_stop() {
int status = IOHOOK_FAILURE;
CFStringRef mode = CFRunLoopCopyCurrentMode(event_loop);
if (mode != NULL) {
CFRelease(mode);
// Make sure the tap doesn't restart.
restart_tap = false;
// Stop the run loop.
CFRunLoopStop(event_loop);
status = IOHOOK_SUCCESS;
}
logger(LOG_LEVEL_DEBUG, "%s [%u]: Status: %#X.\n",
__FUNCTION__, __LINE__, status);
return status;
}
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