Struct Header _packed Working With Types ¶ Additionally, function prototypes support the following keywords to indicate their calling convention or other features: Structs support the attribute _packed to indicate that there is no padding. The shortcuts for editing existing elements are: -: To quickly toggle integers between signed and unsigned integers, you can use the - hotkey.d: If you want to cycle through the different integer sizes, repeatedly pressing d has the same effect as pressing the numbers in order.1, 2, 4, 8: The number hotkeys will create a create an integer of the specified size.Alternatively, you can use the right-click menu to access these options and more. This will make it easier to see which offsets of a structure are being used, and aid in the process of creating structure members.įrom within the Types view, you can use the following hotkeys to create new types, structures, or unions.
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For example, the _offset(0x8).q token means the code references the offset 0x8 of this structure, and the size of the access is a qword. It uses the same convention as in the graph/linear view.
Types view now annotates code references to structure offsets. These headers are applied when viewing the binary in linear view and will show the parsed binary data into that structure or type making them particularly useful for binary parsing even of non-executable file formats. This is the most common interface for creating structures, unions and types using C-style syntax.įor many built-in file formats you'll notice that common headers are already enumerated in the types view. Alternatively, you can access it with the t hotkey from most other views, or using p to access the command-palette and typing "types". It can be accessed from the menu View > Types. To see all types in a Binary View, use the types view. Any variables that are shared between the ILs will be updated as types are applied. Types can be applied on both disassembly and all levels of IL. Simply select an appropriate token (variable or memory address), and press y to bring up the change type dialog. From the UI, just select the function, variable, member, or register you want to change and press n. Of course, even if the binary doesn't come with symbol information, you can always add your own. Some binaries helpfully have symbol information in them which makes reverse engineering easier. Therefore, some of the most important actions you can take while reverse engineering is renaming symbols/variables, applying types, and creating new types to apply. The biggest culprit of bad decompilation is often missing type information.
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The second section is how to interact with any type, regardless of its source.įor more about type libraries, signature library, and how to interact with types through the API, see the applying annotations section of the developer guide. The first section is how apply and create types. This document is organized into two sections describing how to work with types in Binary Ninja. Working with Types, Structures, and Symbols ¶
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