ObjcSelRefs = (sect.getStartingAddress(),sect.getStartingAddress()+sect.getLength()) ObjcData = (sect.getStartingAddress(),sect.getStartingAddress()+sect.getLength()) If objcSelRefs and x >= objcSelRefs and x =objcMsgRefs and x = objcConst and x 1:Įachxrefs = seg.getReferencesOfAddress(addr) Print 'xreffrom: ' + hex(x) ,'xrefto: ' + hex(namePtr) NamePtr = doc.readUInt64LE(classMethodsVA) #get name field in struct _objc_method, it's selector #author: Kai getRefPtr(doc,classMethodsVA,objcSelRefs, objcMsgRefs, objcConst): The following is the python script objc2_xrefs_helper_hopper.py. Loading the demo application’s executable file into Hopper Disassembler We load the executable mach-o file of the demo application into Hopper Disassembler, as shown below.įigure 2. The demo application can be downloaded from here. To verify the functionality of objc2_xrefs_helper_hopper.py, I wrote a simple Cocoa application. The relationship between these related data structures of class in Objective-C I have included a figure showing the relationship between these related data structures, as shown below.įigure 1. It’s important that we figure out the data structures of Class in low level in Objective-C, as well as the relationship between these data structures. Before rewriting the python script for Hopper, therefore, we need to walk through the codes in IDAPython script objc2_xrefs_helper.py and understand all the details. Unfortunately, this message sending mechanism causes problems when trying to follow cross-references for selectors in Hopper Disassembler. As mentioned in that article, the function call is implemented by the message sending mechanism in Objective-C. Some background regarding Objective-C can be found from here. I named this Hopper python script objc2_xrefs_helper_hopper.py. It greatly helps the understanding of the code to use symbols, rather than raw numbers.I rewrote the IDAPython script named objc2_xrefs_helper.py and developed a python script for the Hopper Disassembler. Use the embedded type editor to create your own structures, unions, or enumerated types. Use tabs to create workspaces with different representations of the file. The analysis performed by Hopper separates code from data, memory accesses from stack variables… And to help you understand the various discovered objects, Hopper will use a different color to each of them. This new version of Hopper is able to decode the mangled Swift names. Hopper can use LLDB or GDB, which lets you debug and analyze the binary in a dynamic way (Intel CPU only).īased on an advanced understanding of the executable Hopper can present a pseudo-code representation of the procedures found in an executable. Hopper is specialized in retrieving Objective-C information in the files you analyze, like selectors, strings and messages sent. Most of the Hopper features can be invoked from Python scripts, giving you the ability to transform a binary in any way you want.Įven if Hopper can disassemble any kind of Intel executable, it does not forget its main platform. Once a procedure has been detected, Hopper displays a graphical representation of the control flow graph. Hopper analyzes function's prologues to extract procedural information such as basic blocks and local variables. ![]() With the Hopper SDK, you'll be able to extend Hopper's features, and even write your own file format and CPU support. The macOS version makes full use of the Cocoa framework, and the Linux version makes use of Qt 5. ![]() Hopper is perfectly adapted to the environment. ![]() Hopper is able to transform the assembly language into a pseudo-code that is easier to understand! You can use its internal Python scripting engine to analyze binaries the way you want (this feature works only with Lion)! Starting from version 2.0, Hopper can even use GDB to debug programs!Īnd, last but not least, unlike all other tools of its kind, Hopper is perfectly integrated into the OS X environment. It will let you disassemble any binary you want, and provide you all the information about its content, like imported symbols, or the control flow graph! Hopper can retrieve procedural information about the disassembled code like the stack variables, and lets you name all the objects you want. Hopper Disassembler is a binary disassembler, decompiler, and debugger for 32-bit and 64-bit executables.
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