Forked from schirrmacher/frida-struct-pointer-pointer.js
Created
December 8, 2023 19:27
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Frida: How to read a struct or a struct pointer or a pointer of a struct pointer?
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/* | |
typedef struct { | |
int size; | |
char* data; | |
} test_struct; | |
void some_func(test_struct **s); | |
*/ | |
const some_func_pointer = Module.getExportByName('libsrtp', 'some_func'); | |
const some_func = new NativeFunction(some_func_pointer, "void", ["pointer"]); | |
Interceptor.replace(some_func_pointer, new NativeCallback(function (pointer) { | |
console.log(pointer.readPointer().readInt()) // size | |
console.log(pointer.readPointer().add(Process.pointerSize).readPointer().readUtf8String()); // data | |
some_func(pointer); | |
}, "void", ["pointer"])); |
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/* | |
typedef struct { | |
int size; | |
char* data; | |
} test_struct; | |
void some_func(test_struct *s); | |
*/ | |
const some_func_pointer = Module.getExportByName('libsrtp', 'some_func'); | |
const some_func = new NativeFunction(some_func_pointer, "void", ["pointer"]); | |
Interceptor.replace(some_func_pointer, new NativeCallback(function (pointer) { | |
console.log(pointer.readInt()) // size | |
console.log(pointer.add(Process.pointerSize).readPointer().readUtf8String()); // data | |
some_func(pointer); | |
}, "void", ["pointer"])); |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* | |
typedef struct { | |
int size; | |
char* data; | |
} test_struct; | |
void some_func(test_struct s); | |
*/ | |
const some_func_pointer = Module.getExportByName('libsrtp', 'some_func'); | |
const some_func = new NativeFunction(some_func_pointer, "void", ["int", "pointer"]); | |
Interceptor.replace(some_func_pointer, new NativeCallback(function (size, data) { | |
console.log(size) | |
console.log(data.readUtf8String()) | |
some_func(size, data); | |
}, "void", ["int", "pointer"])); |
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