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/* InspectiveC by DavidGoldman
 * Place this file in `/usr/lib/cycript0.9/com/golddavid/inspectivec.cy`
 * Run `@import com.golddavid.inspectivec` in cycript to use.
 * 
 * This file has been adapted from 
 * https://github.com/DavidGoldman/InspectiveC/blob/master/cycript/InspectiveC.cy
 * to use new cycript module features. 
 * 
 * This module is based on 
 * https://github.com/limneos/classdump-dyld/blob/master/classdumpdyldlib/classdumpdyld.cy

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#include <stdio.h>
#include <stdlib.h>
#include <limits.h>

/* prints each character representation of the byte one at a time.
 * no memory management required; slower, than using a buffer.
 */
#define printBitRepresentationEach(a)                        \
    ({                                                       \
        for (size_t _i = (sizeof(a) * CHAR_BIT); _i; _i--) { \

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Cydia Virtual Dependency Packages

Cydia provides "virtual dependency" packages, leveraging dpkg, to allow packages to only be installed on certain kinds of devices.

I have not been able to find official documentation on these packages. Their package names are prefixed with "cy+". To find out exactly what these packages represented I ran a few command on two devices.

Testing

iPhone 5, iOS 10.3.3:

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## LLVM syntax highlighting for nano by Leptos
## Based off the official nano C/C++ template

syntax ll "\.ll$"
magic "LLVM source"
comment ";"

# all numeral literals
color brightcyan "-?[0-9]*"

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function lw() {
	for ARG in "$@"
	do
		WHICH_RESULT=$(which "$ARG") && {
			[[ -e "$WHICH_RESULT" ]] && {
				l "$WHICH_RESULT"
				continue
			}
		}
		echo "$WHICH_RESULT"

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//
//  main.c
//  polymaths
//
//  Created by Leptos on 9/18/18.
//  Copyright © 2018 Leptos. All rights reserved.
//

#include <stdio.h>
#include <math.h>

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Cycript on Mojave

Cycript is a tool I find very helpful. It's an effective REPL for Objective-C. When I updated to macOS Mojave, I found that cycript no longer worked because it was linked against an old version of Ruby. After attempting to compile from source, I tried another solution. install_name_tool is an open source tool for modifying the names of linked shared libraries in a Mach-O.

Solution

$ install_name_tool -change /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/libruby.2.0.0.dylib /System/Library/Frameworks/Ruby.framework/Versions/Current/usr/lib/libruby.dylib Cycript.lib/cycript-apl
$ install_name_tool -change /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/libruby.2.0.0.dylib /System/Library/Frameworks/Ruby.framework/Versions/Current/usr/lib/libruby.dylib Cycript.lib/libcycript.dylib

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Mojave Dynamic Desktop- How it works

Prompted by a tweet by NSHipster, and a subsequent thread, I wanted to find out how Mojave dynamic wallpapers worked. NSHipster and ole reverse engineered the file format. In the Twitter thread, NSHipster mentions an edge case: What happens above 66ºN (latitude)?

The first thing to do was find out what process handles the wallpaper on macOS. I primarily do iOS research, and honestly had no idea. I opened Console, searched for "solar", and then changed my static wallpaper to a dynamic one. Voila!

Message: index: 7 next: 14815.999366

Process: Dock

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//
//  LMApiaryDeviceCrypto.h
//
//  Created by Leptos on 11/18/18.
//  Copyright © 2018 Leptos. All rights reserved.
//

#import <Foundation/Foundation.h>

#define kYouTubeBase64EncodedProjectKey @"vOU14u6GkupSL2pLKI/B7L3pBZJpI8W92RoKHJOu3PY="

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YTIThumbnailDetails classdump notes

While class dumping YouTube Music, I ran into two problematic properties in a protobuf-generated class.

The property largestImageSource had the type encoding

{YTImageSource=@@{YTClientResource=@@{optional<unsigned int>=B(?={dummy_type=[4{empty_struct=}]}I)}}{optional<unsigned int>=B(?={dummy_type=[4{empty_struct=}]}I)}{optional<unsigned int>=B(?={dummy_type=[4{empty_struct=}]}I)}}