Cycript Tricks
From iPhone Development Wiki
Contents |
Printing Ivars
Often just typing *varName works:
cy# *controller {isa:"PrefsRootController",_contentView:"<UIView: 0x10bd70; frame = (0 0; 320 460); autoresize = W+H; layer = <CALayer: 0x150120>>",_navBar:... cy#
Sometimes it does not...
cy# *UIApp {message:"hasProperty callback returned true for a property that doesn't exist.",name:"ReferenceError"}
then you can do:
cy# [i for (i in *UIApp)] ["isa","_delegate","_touchMap","_exclusiveTouchWindows","_event",...
You may use this function to get as much ivar values as possible:
function tryPrintIvars(a){ var x={}; for(i in *a){ try{ x[i] = (*a)[i]; } catch(e){} } return x; }
To use:
cy# *a {message:"hasProperty callback returned true for a property that doesn't exist.",name:"ReferenceError"} cy# tryPrintIvars(a) {isa:"SBWaveView",_layer:"<CALayer: 0x2a5160>",_tapInfo:null,_gestureInfo:null,_gestureRecognizers:...
Printing Methods
Function to get the methods:
function printMethods(className) { var count = new new Type("I"); var methods = class_copyMethodList(objc_getClass(className), count); var methodsArray = []; for(var i = 0; i < *count; i++) { var method = methods[i]; methodsArray.push({selector:method_getName(method), implementation:method_getImplementation(method)}); } free(methods); free(count); return methodsArray; }
Usage:
cy# printMethods("MailboxPrefsTableCell") [{selector:@selector(layoutSubviews),implementation:0x302bf2e9},{selector:@selector(setCurrentMailbox:),implementation:0x302bee0d},... cy#
Get methods matching particular RegExp
function methodsMatching(cls, regexp) { return [[new Selector(m).type(cls), m] for (m in cls.messages) if (!regexp || regexp.test(m))]; }
Usage:
cy# methodsMatching(NSRunLoop, /forKey:$/) [["v20@0:4I8@12@16","didChange:valuesAtIndexes:forKey:"],["v20@0:4I8@12@16","willChange:valuesAtIndexes:forKey:"],["v16@0:4@8@12","setValue:forKey:"]]
Getting Objective-C Objects from Addresses
Use new Instance(0xdeadbabe).
cy# var p = new Instance(0x8614390) cy# p ["<SKPaymentTransaction: 0x8613d80>"]
Load frameworks
function loadFramework(fw) { var h="/System/Library/",t="Frameworks/"+fw+".framework"; [[NSBundle bundleWithPath:h+t]||[NSBundle bundleWithPath:h+"Private"+t] load]; }
Replacing existing Objective-C methods
You can simulate MSHookMessage by replacing contents in the messages array, e.g.
cy# original_NSRunLoop_description = NSRunLoop.messages['description']; 0x339d94c3 cy# NSRunLoop.messages['description'] = function() { return original_NSRunLoop_description.call(this).toString().substr(0, 80)+", etc."; } {} cy# [NSRunLoop currentRunLoop] "<CFRunLoop 0x205ee0 [0x381dbff4]>{locked = false, wait port = 0x1303, stopped = , etc."
Note the func.call(self) construct. This binds the self in the original function to the user-specified one. If more than one variable is needed, use func.call(self, arg1, arg2, arg3, ...). Note that the subsequent arguments will not be automatically mapped to the corresponding Objective-C types, so instead of "foo" you will need to use [NSString stringWithString:"foo"].
Getting class methods
class.messages only contains instance methods. To hook class methods, you need to get to its metaclass. A simple way would be
cy# NSRunLoop->isa.messages['currentRunLoop'] = ...
Include other Cycript files
As of 0.9.274-1, there isn't a native file import feature. If cycript will be hooked into another process, since the data will be retained there, you can first load the other .cy file with this:
localhost:~ mobile$ cycript -p SpringBoard main.cy 0x12345678 localhost:~ mobile$ cycript -p SpringBoard cy# ...
If cycript is launched standalone, inclusion can still be faked with a combination of cycript compiler and Javascript's eval function:
// include other .cy files function include(fn) { var t = [new NSTask init]; [t setLaunchPath:@"/usr/bin/cycript"]; [t setArguments:["-c", fn]]; var p = [NSPipe pipe]; [t setStandardOutput:p]; [t launch]; [t waitUntilExit]; var s = [new NSString initWithData:[[p fileHandleForReading] readDataToEndOfFile] encoding:4]; return this.eval(s.toString()); }
Using NSLog
Type in the console:
NSLog_ = dlsym(RTLD_DEFAULT, "NSLog")
NSLog = function() { var types = 'v', args = [], count = arguments.length; for (var i = 0; i != count; ++i) { types += '@'; args.push(arguments[i]); } new Functor(NSLog_, types).apply(null, args); }
And then you can use NSLog as usual:
cy# NSLog_ = dlsym(RTLD_DEFAULT, "NSLog")
0x31451329
cy# NSLog = function() { var types = 'v', args = [], count = arguments.length; for (var i = 0; i != count; ++i) { types += '@'; args.push(arguments[i]); } new Functor(NSLog_, types).apply(null, args); }
{}
cy# NSLog("w ivars: %@", tryPrintIvars(w))
If you are attached to a process, the output is going to be in the syslog:
Nov 17 20:26:01 iPhone3GS Foobar[551]: w ivars: {\n contentView = <UIView: 0x233ea0; ....}
Writing Cycript output to file
Cycript output is an NSString, so it is possible to call writeToFile and save it somewhere. Example:
[[someObject someFunction] writeToFile:"/var/mobile/cycriptoutput.txt" atomically:NO encoding:4 error:NULL]
You can use this, for example, to get a dump of SpringBoard's view tree.
iPhone:~$ cycript -p SpringBoard cy# [[UIApp->_uiController.window recursiveDescription] writeToFile:"/var/mobile/viewdump.txt" atomically:NO encoding:4 error:NULL]
Printing view hierarchy
cy# ?expand expand == true cy# UIApp.keyWindow.recursiveDescription "<UIWindow: 0x13a900; frame = (0 0; 320 480); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x13a9d0>> <UITextField: 0x13abf0; frame = (20 40; 280 31); text = ''; opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x13ad10>> <UITextFieldRoundedRectBackgroundView: 0x143d10; frame = (0 0; 280 31); userInteractionEnabled = NO; layer = <CALayer: 0x143dc0>> <UIImageView: 0x144030; frame = (0 0; 8 15); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1440b0>> <UIImageView: 0x144400; frame = (8 0; 264 15); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x144430>> <UIImageView: 0x144460; frame = (272 0; 8 15); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x144490>> <UIImageView: 0x1444c0; frame = (8 0; 0 15); userInteractionEnabled = NO; layer = <CALayer: 0x1444f0>> <UIImageView: 0x144520; frame = (0 15; 8 1); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x144550>> <UIImageView: 0x144580; frame = (8 15; 264 1); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1445b0>> <UIImageView: 0x1445e0; frame = (272 15; 8 1); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x144610>> <UIImageView: 0x144640; frame = (8 15; 0 1); userInteractionEnabled = NO; layer = <CALayer: 0x144670>> <UIImageView: 0x1446a0; frame = (0 16; 8 15); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1446d0>> <UIImageView: 0x144700; frame = (8 16; 264 15); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x144730>> <UIImageView: 0x144760; frame = (272 16; 8 15); opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x144790>> <UIImageView: 0x1447c0; frame = (8 16; 0 15); userInteractionEnabled = NO; layer = <CALayer: 0x1447f0>> <UILabel: 0x13aaf0; frame = (9 8; 266 15); text = 'Test'; clipsToBounds = YES; opaque = NO; userInteractionEnabled = NO; layer = <CALayer: 0x1399f0>>"
