[Soot-list] Instrumenting Android apps using a helper class

[Aniya Aggarwal]

Hi All,
I am trying to instrument an Android application (ie apk) using a Helper
Class named "HelloWorld.java". I am using FlowDroid to generate a call
graph for the app and then after performing some analysis, trying to
instrument the app using "HelloWorld". Since while using FlowDroid,
PackManager.v().runPacks() is executed instead of Soot.Main.main(args),
therefore I have called Scene.v().addBasicClass("HelloWorld") before
PackManager.v().runPacks(). However, when I try to access the methods
defined in "HelloWorld" class during instrumentation phase using
Scene.v().getSootClass("HelloWorld").getMethods(), it returns an empty
list. Please note that HelloWorld.java has two methods defined in it.
I am sharing the code snippet for the main() of my Driver Class for your
reference.

Please let me know in case I am trying to access the helper class
incorrectly using FlowDroid and suggest an alternative.

*//Main method of Driver Class*
public static void main(String[] args) { SetupApplication app = new
SetupApplication("C:\\Program Files
(x86)\\Android\\android-sdk\\platforms","C:\\Users\\Ani\\Desktop\\new
try\\ToyExample.apk"); try {
app.calculateSourcesSinksEntrypoints("E:\\Program Analysis
Workspace\\Flowdroid_Test\\SourcesAndSinks.txt"); } catch (IOException e) {
e.printStackTrace(); } catch (XmlPullParserException e) {
e.printStackTrace(); } soot.G.reset();
Options.v().set_src_prec(Options.src_prec_apk);
Options.v().set_process_dir(Collections.singletonList("C:\\Users\\Ani\\Desktop\\new
try\\ToyExample.apk"));
Options.v().set_android_jars("C:\\Program Files
(x86)\\Android\\android-sdk\\platforms");
Options.v().set_whole_program(true);
Options.v().set_allow_phantom_refs(true);
Options.v().set_output_dir("E:\\Program Analysis
Workspace\\Flowdroid_Test\\sootOutput\\");
Options.v().set_output_format(Options.output_format_jimple);
Options.v().setPhaseOption("cg.spark", "on");
Options.v().set_whole_program(true);




*Scene.v().addBasicClass("HelloWorld"); //Adding helper class into
scene* Scene.v().loadNecessaryClasses();
SootMethod entryPoint = app.getEntryPointCreator().createDummyMain();
Options.v().set_main_class(entryPoint.getSignature());
Scene.v().setEntryPoints(Collections.singletonList(entryPoint));
System.out.println(entryPoint.getActiveBody()); PackManager.v().runPacks();
CallGraph cg = Scene.v().getCallGraph(); Map options = new HashMap();
PurityOptions opt = new PurityOptions(options); EscapeInterProc p = new
EscapeInterProc(cg, Scene.v().getEntryPoints().iterator(), opt);
//Executing the analysis map = p.loop_reset; for(SootMethod method :
map.keySet()){ AndroidInstrumentation a = new
AndroidInstrumentation(Scene.v().getMethod(method.getSignature()));
//Executing bytecode instrumentation module }
PackManager.v().writeOutput(); }






Thanks & Regards,
Aniya Aggarwal
MT-12034
M.Tech CSE (Data Engineering)
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