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can not trace java function with 10.0.12 #283

DogeWatch opened this issue Jun 12, 2017 · 1 comment

can not trace java function with 10.0.12 #283

DogeWatch opened this issue Jun 12, 2017 · 1 comment


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@DogeWatch DogeWatch commented Jun 12, 2017

my code is:
URI = Java.use("");
URI.URI.implementation = function(){
console.log("URI modified");

and it says
{u'columnNumber': 1, u'description': u"TypeError: cannot write property 'implementation' of undefined", u'fileName': u'script1.js', u'lineNumber': 17, u'type': u'error', u'stack': u"TypeError: cannot write property 'implementation' of undefined\n at [anon] (duk_hobject_props.c:3352)\n at [anon] (script1.js:17)\n at frida/node_modules/frida-java/lib/vm.js:39\n at y (frida/node_modules/frida-java/index.js:322)\n at frida/node_modules/frida-java/index.js:296\n at frida/node_modules/frida-java/lib/vm.js:39\n at java.js:2209\n at script1.js:18"}


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@dzonerzy dzonerzy commented Jun 16, 2017

Your code is wrong , since URI is you wrapper class to, if you want to hook constructor , you should do something similar:

var URI = Java.use('');
URI.$init.overload('java.lang.String').implementation = function (url)
send("URI object created with value: " + url);
// call the original method not the hooked one
return URI.$init.overload('java.lang.String').call(this, url);

We used .overload('java.lang.String') since URI constructor have different signature as stated here

@oleavr oleavr closed this Jun 16, 2017
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