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var addrGetDexFile = null;
var funcGetDexFile = null;
var addrGetObsoleteDexCache = null;
var addrGetCodeItemLength = null;
var funcGetCodeItemLength = null;
var addrBase64_encode = null;
var funcBase64_encode = null;
var addrFreeptr = null;
var funcFreeptr = null;
var savepath = "/sdcard";
function DexFile(start, size) {
this.start = start;
this.size = size;
}
function ArtMethod(dexfile, artmethodptr) {
this.dexfile = dexfile;
this.artmethodptr = artmethodptr;
}
function dumpcodeitem(methodname, artmethodobj, fileflag) {
if (artmethodobj != null) {
var dexfileobj = artmethodobj.dexfile;
var dexfilebegin = dexfileobj.start;
var dexfilesize = dexfileobj.size;
var dexfile_path = savepath + "/" + dexfilesize + "_" + Process.getCurrentThreadId() + ".dex";
var dexfile_handle = null;
try {
dexfile_handle = new File(dexfile_path, "r");
if (dexfile_handle && dexfile_handle != null) {
dexfile_handle.close()
}
} catch (e) {
dexfile_handle = new File(dexfile_path, "a+");
if (dexfile_handle && dexfile_handle != null) {
var dex_buffer = ptr(dexfilebegin).readByteArray(dexfilesize);
dexfile_handle.write(dex_buffer);
dexfile_handle.flush();
dexfile_handle.close();
console.log("[dumpdex]:", dexfile_path);
}
}
var artmethodptr = artmethodobj.artmethodptr;
var dex_code_item_offset_ = Memory.readU32(ptr(artmethodptr).add(8));
var dex_method_index_ = Memory.readU32(ptr(artmethodptr).add(12));
if (dex_code_item_offset_ != null && dex_code_item_offset_ > 0) {
var dir = savepath;
var file_path = dir + "/" + dexfilesize + "_" + Process.getCurrentThreadId() + "_" + fileflag + ".bin";
var file_handle = new File(file_path, "a+");
if (file_handle && file_handle != null) {
var codeitemstartaddr = ptr(dexfilebegin).add(dex_code_item_offset_);
var codeitemlength = funcGetCodeItemLength(ptr(codeitemstartaddr));
if (codeitemlength != null & codeitemlength > 0) {
Memory.protect(ptr(codeitemstartaddr), codeitemlength, 'rwx');
var base64lengthptr = Memory.alloc(8);
var arr = [0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
Memory.writeByteArray(base64lengthptr, arr);
var base64ptr = funcBase64_encode(ptr(codeitemstartaddr), codeitemlength, ptr(base64lengthptr));
var b64content = ptr(base64ptr).readCString(base64lengthptr.readInt());
funcFreeptr(ptr(base64ptr));
var content = "{name:" + methodname + ",method_idx:" + dex_method_index_ + ",offset:" + dex_code_item_offset_ + ",code_item_len:" + codeitemlength + ",ins:" + b64content + "};";
file_handle.write(content);
file_handle.flush();
file_handle.close();
}
} else {
console.log("openfile failed,filepath:", file_path);
}
}
}
}
function init() {
console.log("go into init," + "Process.arch:" + Process.arch);
var module_libext = null;
if (Process.arch === "arm64") {
module_libext = Module.load("/data/app/fart64.so");
} else if (Process.arch === "arm") {
module_libext = Module.load("/data/app/fart.so");
}
if (module_libext != null) {
addrGetDexFile = module_libext.findExportByName("GetDexFile");
funcGetDexFile = new NativeFunction(addrGetDexFile, "pointer", ["pointer", "pointer"]);
addrGetCodeItemLength = module_libext.findExportByName("GetCodeItemLength");
funcGetCodeItemLength = new NativeFunction(addrGetCodeItemLength, "int", ["pointer"]);
addrBase64_encode = module_libext.findExportByName("Base64_encode");
funcBase64_encode = new NativeFunction(addrBase64_encode, "pointer", ["pointer", "int", "pointer"]);
addrFreeptr = module_libext.findExportByName("Freeptr");
funcFreeptr = new NativeFunction(addrFreeptr, "void", ["pointer"]);
}
var symbols = Module.enumerateSymbolsSync("libart.so");
for (var i = 0; i < symbols.length; i++) {
var symbol = symbols[i];
if (symbol.name.indexOf("ArtMethod") >= 0 && symbol.name.indexOf("GetObsoleteDexCache") >= 0) {
addrGetObsoleteDexCache = symbol.address;
break;
}
}
}
function dealwithmethod(classname, method) {
var jnienv = Java.vm.getEnv();
var ArtMethodptr = jnienv.fromReflectedMethod(ptr(method.$handle));
var DexFileptr = funcGetDexFile(ptr(ArtMethodptr), ptr(addrGetObsoleteDexCache));
if (DexFileptr != null) {
var dexfilebegin = Memory.readPointer(ptr(DexFileptr).add(Process.pointerSize * 1));
var dexfilesize = Memory.readU32(ptr(DexFileptr).add(Process.pointerSize * 2));
var dexfileobj = new DexFile(dexfilebegin, dexfilesize);
if (ArtMethodptr != null) {
var artmethodobj = new ArtMethod(dexfileobj, ArtMethodptr);
dumpcodeitem(classname + "->" + method.toString(), artmethodobj, 'all');
}
}
}
function dumpmethod(classname, method) {
console.log("start dump method:" + classname + "---" + method.toString());
var jnienv = Java.vm.getEnv();
var ArtMethodptr = jnienv.fromReflectedMethod(ptr(method.$handle));
var DexFileptr = funcGetDexFile(ptr(ArtMethodptr), ptr(addrGetObsoleteDexCache));
if (DexFileptr != null) {
var dexfilebegin = Memory.readPointer(ptr(DexFileptr).add(Process.pointerSize * 1));
var dexfilesize = Memory.readU32(ptr(DexFileptr).add(Process.pointerSize * 2));
var dexfileobj = new DexFile(dexfilebegin, dexfilesize);
if (ArtMethodptr != null) {
var artmethodobj = new ArtMethod(dexfileobj, ArtMethodptr);
dumpcodeitem(classname + "->" + method.toString(), artmethodobj, classname);
}
}
}
function dumpclass(classname) {
if (Java.available) {
Java.perform(function () {
console.log("go into enumerateClassLoaders!");
Java.enumerateClassLoaders({
onMatch: function (loader) {
try {
var loadclass = loader.loadClass(classname);
console.log(loader + "-->loadclass " + classname + " success!");
var methods = loadclass.getDeclaredConstructors();
for (var i in methods) {
dumpmethod(classname, methods[i]);
}
methods = loadclass.getDeclaredMethods();
for (var i in methods) {
dumpmethod(classname, methods[i]);
}
} catch (e) {
}
},
onComplete: function () {
}
});
});
}
}
function dealwithClassLoader(classloaderobj) {
if (Java.available) {
Java.perform(function () {
try {
var dexfileclass = Java.use("dalvik.system.DexFile");
var BaseDexClassLoaderclass = Java.use("dalvik.system.BaseDexClassLoader");
var DexPathListclass = Java.use("dalvik.system.DexPathList");
var Elementclass = Java.use("dalvik.system.DexPathList$Element");
var basedexclassloaderobj = Java.cast(classloaderobj, BaseDexClassLoaderclass);
var tmpobj = basedexclassloaderobj.pathList.value;
var pathlistobj = Java.cast(tmpobj, DexPathListclass);
console.log("pathlistobj->" + pathlistobj);
var dexElementsobj = pathlistobj.dexElements.value;
console.log("dexElementsobj->" + dexElementsobj);
for (var i in dexElementsobj) {
var obj = dexElementsobj[i];
var elementobj = Java.cast(obj, Elementclass);
console.log("elementobj->" + elementobj);
tmpobj = elementobj.dexFile.value;
var dexfileobj = Java.cast(tmpobj, dexfileclass);
var enumeratorClassNames = dexfileobj.entries();
while (enumeratorClassNames.hasMoreElements()) {
var classname = enumeratorClassNames.nextElement().toString();
console.log("start loadclass->" + classname);
var loadclass = classloaderobj.loadClass(classname);
console.log("after loadclass->" + classname);
var methods = loadclass.getDeclaredConstructors();
for (var i in methods) {
dealwithmethod(classname, methods[i]);
}
methods = loadclass.getDeclaredMethods();
for (var i in methods) {
dealwithmethod(classname, methods[i]);
}
}
}
} catch (e) {
console.log(e);
}
});
}
}
function fart() {
if (Java.available) {
Java.perform(function () {
console.log("go into enumerateClassLoaders!");
Java.enumerateClassLoaders({
onMatch: function (loader) {
if (loader.toString().indexOf("BootClassLoader") >= 0) {
console.log("this is a BootClassLoader!")
} else {
try {
console.log("startdealwithclassloader:", loader, '\n');
dealwithClassLoader(loader);
} catch (e) {
console.log("error", e);
}
}
},
onComplete: function () {
console.log("find Classloader instance over");
}
});
});
}
}
function nop_64(addr) {
Memory.protect(addr, 4 , 'rwx');
var w = new Arm64Writer(addr);
w.putRet();
w.flush();
w.dispose();
}
function hook_clone(soname)
{
var clone = Module.findExportByName('libc.so', 'clone');
Interceptor.attach(clone, {
onEnter: function(args) {
if(args[3] != 0){
var addr = args[3].add(96).readPointer()
var so_name = Process.findModuleByAddress(addr).name;
var so_base = Module.getBaseAddress(so_name);
var offset = (addr - so_base);
if(so_name.indexOf(soname) >= 0) {
console.log("===============>", so_name, addr,offset, offset.toString(16));
nop_64(addr)
}
}
},
onLeave: function(retval) {
}
});
}
setImmediate(hook_clone, "libDexHelper.so")
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