https://olszanowski.blog/ Recent content on Discover iOS Hugo -- gohugo.io en-us Fri, 08 May 2020 17:15:58 +0200 https://olszanowski.blog/posts/macho-reader-parsing-headers/ Fri, 08 May 2020 17:15:58 +0200 https://olszanowski.blog/posts/macho-reader-parsing-headers/ Introduction There are plenty of articles that explain how does Mach-O file format looks like, but not so many of them explain how bytes can be transformed into valuable information that can tell us more about the binary itself. Apple provides a command-line tool for reading Mach-O files which is called otool. You can, for example, read a Mach-O header of a binary by invoking the following command: $ otool -h <path_to_binary> Mach header magic cputype cpusubtype caps filetype ncmds sizeofcmds flags 0xfeedfacf 16777228 0 0x00 2 82 9032 0x00218085 You can also read what shared libraries are linked to a specified binary by invoking the following: https://olszanowski.blog/posts/understanding-ios-app-entrypoint/ Sun, 26 Apr 2020 10:00:01 +0200 https://olszanowski.blog/posts/understanding-ios-app-entrypoint/ Application entry point What is an entry point? According to the wikipedia an entry point is where the first instructions of a program are executed, and where the program has access to command-line arguments. In many languages an entry point is a function named main. For instance, in C/C++ the entry point is a function main, in Java it is defined as a static function main, in C# it is a static function Main. https://olszanowski.blog/posts/reverse-engineering-salesforce-chat-sdk/ Fri, 10 Apr 2020 12:37:22 +0200 https://olszanowski.blog/posts/reverse-engineering-salesforce-chat-sdk/ Introduction Before start looking into the Salesforce Chat SDK binary, I want to provide a little context for why I decided to reverse engineer the framework. I was integrating the chat in one of the projects I’ve been involved into. After adding Salesforce SDK to the Xcode project, I’ve tried to open the chat inside the application I was developing. Surprisingly, the chat from the SDK was not working properly - namely, it didn’t show localized strings, but rather their corresponding keys.