It's been almost four years since my last blog post. A lot has happened since then! I've decided to relaunch my blog to contribute some things I've discovered or learnt that may be useful…
chendo
A collection of 31 posts
Live Wireshark session from remote machine
I was tasked to debug some network stack issues last week at work which required intercepting wireless traffic at the router. Previously, I would use my Macbook to share internet through an Ethernet port, and then open a Wireshark session…
Simulating out of order packets on OS X
I needed a way to simulate out of order packets in order to try to reproduce an issue I've been seeing at work, and I figured out a fairly simple way that only involves ipfw which is built-…
Reverse engineering Xcode with dtrace
Both OS X and iOS tend to have a love-hate relationship with Xcode. Crashing, lacking solid refactoring tools, some UX failures, and so on. For me, it is/was [https://github.com/chendo/FuzzyAutocompletePlugin] the lack of a good…
Visualising CGRects and NSRects from lldb with drawrect
Halfway through debugging the new enumeration engine for Shortcat [https://shortcatapp.com/], I realised I needed a way to visualise CGRect/NSRect s while debugging. Trying to figure out how one CGRect relates to another by looking at four numbers…
Building a Command Line OS X app with RubyMotion
I decided to write a command line tool with RubyMotion [http://rubymotion.com/] to visualise CGRects and NSRects from lldb [https://chen.do/blog/2013/10/04/visualising-rects-from-lldb/], but I quickly discovered that RubyMotion does not support…
Selectively ignoring Objective-C exceptions in Xcode
Edit - Octorber 9, 2013: Updated the script to support iOS Simulator (i386) and iPhone 5S (ARM 64bit). Xcode has the ability to break on all Objective-C exceptions (Debug > Breakpoints > Create Exception Breakpoint...), which is extremely useful as…
Editing files on a remote server with Sublime Text 2
I've always hated editing files on a remote machine over SSH. I'm not a huge fan of vim, and nano is terrible for anything remotely (hah, get it?) complex. Being able to use your local editor…
Python-like Docstrings in Ruby!
About six months ago, I watched Peter Cooper's Ruby Trickshots [http://rubyreloaded.com/trickshots] and learnt that Ruby has an interesting syntax that allows you to concatenate strings by simply placing them after each other. For example: "…
Running individual specs with RubyMotion
I'm testing parts of Shortcat [http://shortcatapp.com/] (which as of v0.4.0 is in Objective-C) with RubyMotion [http://www.rubymotion.com/], which is pretty nifty since I'm much more comfortable in Ruby than…