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android intercept libc#open example

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iddoeldor 2019-03-20 14:52:45 +02:00 committed by GitHub
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@ -67,27 +67,28 @@ An example for intercepting `libc#open` & logging backtrace if specific file was
```js ```js
Interceptor.attach(Module.findExportByName("/system/lib/libc.so", "open"), { Interceptor.attach(Module.findExportByName("/system/lib/libc.so", "open"), {
onEnter: function(args) { onEnter: function(args) {
// debug only the intended calls this.flag = false;
this.flag = false; var filename = Memory.readCString(ptr(args[0]));
var filename = Memory.readCString(ptr(args[0])); console.log('filename =', filename)
if (filename.indexOf("something") != -1) { if (filename.endsWith(".xml")) {
this.flag = true; this.flag = true;
var backtrace = Thread.backtrace(this.context, Backtracer.ACCURATE).map(DebugSymbol.fromAddress).join("\n\t"); var backtrace = Thread.backtrace(this.context, Backtracer.ACCURATE).map(DebugSymbol.fromAddress).join("\n\t");
console.log("file name [ " + Memory.readCString(ptr(args[0])) + " ]\nBacktrace:" + backtrace); console.log("file name [ " + Memory.readCString(ptr(args[0])) + " ]\nBacktrace:" + backtrace);
} }
}, },
onLeave: function(retval) { onLeave: function(retval) {
if (this.flag) // passed from onEnter if (this.flag) // passed from onEnter
console.warn("\nretval: " + retval); console.warn("\nretval: " + retval);
} }
}); });
``` ```
<details> <details>
<summary>Output example</summary> <summary>Output example</summary>
Intecepting `com.android.chrome`
![](gif/intercept_open_chrome_android.gif)
TODO
</details> </details>