Delphi IDA Plugin

Author: David Zimmer
Date: 03.04.14 - 5:05am

One limitation of VB6 is that it doesnt support 64 bit numbers without doing funny stuff. This and its lack of forward support has me looking at other languages, Delphi and Free Pascal/Lazarus IDE being the ones I am currently evaluating. (I wont bore you with my .NET rant here)

Anyway, creating an IDA plugin using Lazarus seemed like a good way to test it out. Using the same base technique I developed for VB6/C# plugin UIs, I was able to do the same for Free Pascal. In this case however COM was not required since fp can create standard dlls.

One other neat thing I was able to do, is use the same Delphi DLL for both the plw, and the p64(32 bit, but 64 bit address capable) plugins. This is detected through GetModuleHandle() and seeing which one succeedes. The appropriate function prototypes are then used from there.

I just dont want to do user interfaces or complex string manipulations in C. Higher level languages are the best tool for that job, even if I have to write a small shim layer in between. I have seen reference to people writing IDA plugins purely in Pascal, but this was direct and easy so I went with it.

Download: Delphi plugin for IDA     - (Free Pascal and Delphi 6 source included)

Addendum: Actually I had another realization on the 32/64 bit address thing. The technique I used above to support both is valid, but there is a simpler way. Since I am already using a shim layer to the IDA API, I can have my shim always return 64 numbers regardless if its a 32bit disassembly or not. You will still need to compile the IDA plugin for both , but then you wont even have to use two different function prototypes in the Delphi UI dll to access them. As far as its concerned, function access will be the same regardless.

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