feat(native): module base, size

core/src/main/kotlin/me/rhunk/snapenhance/EventDispatcher.kt

@@ -106,6 +106,5 @@ class EventDispatcher(
                 if (event.canceled) param.setResult(null)
             }
         }
-
     }
 }

core/src/main/kotlin/me/rhunk/snapenhance/SnapEnhance.kt

@@ -98,7 +98,7 @@ class SnapEnhance {
         measureTime {
             with(appContext) {
                 runCatching {
-                    native.init()
+                    native.initOnce(appContext.androidContext.classLoader)
                 }.onFailure {
                     Logger.xposedLog("Failed to init native", it)
                     return

native/jni/src/library.cpp

@@ -1,17 +1,16 @@
 #include <jni.h>
 #include <string>
 #include <dobby.h>
-#include <sys/stat.h>
 #include <unistd.h>
-#include <fstream>
 #include <vector>
 
 #include "logger.h"
 #include "config.h"
+#include "util.h"
 
 static native_config_t *native_config;
 
-static auto fstat_original = fstat;
+static auto fstat_original = (int (*)(int, struct stat *)) nullptr;
 static int fstat_hook(int fd, struct stat *buf) {
     char name[256];
     memset(name, 0, 256);
@@ -35,14 +34,37 @@ static int fstat_hook(int fd, struct stat *buf) {
 }
 
 
-#define GET_BOOL_FIELD(env, clazz, field) env->GetBooleanField(clazz, env->GetFieldID(clazz, field, "Z"))
+extern "C" JNIEXPORT void JNICALL
+init(JNIEnv *env, jobject clazz, jobject classloader) {
+    LOGD("initializing native");
+    // config
+    native_config = new native_config_t;
+
+    // load libclient.so
+    util::load_library(env, classloader, "client");
+    auto client_module = util::get_module("libclient.so");
+    if (client_module.base == 0) {
+        LOGE("libclient not found");
+        return;
+    }
+    client_module.base -= 0x1000;
+    LOGD("libclient: offset: 0x%x size: 0x%x", client_module.base, client_module.size);
+
+    // hooks
+    DobbyHook((void *) DobbySymbolResolver("libc.so", "fstat"), (void *) fstat_hook,
+              (void **) &fstat_original);
+
+    LOGD("native initialized");
+}
+
 
 extern "C" JNIEXPORT void JNICALL
 loadConfig(JNIEnv *env, jobject clazz, jobject config_object) {
-    auto native_config_class = env->GetObjectClass(config_object);
+    auto native_config_clazz = env->GetObjectClass(config_object);
+    #define GET_CONFIG_BOOL(name) env->GetBooleanField(config_object, env->GetFieldID(native_config_clazz, name, "Z"))
 
-    native_config->disable_bitmoji = GET_BOOL_FIELD(env, native_config_class, "disableBitmoji");
-    native_config->disable_metrics = GET_BOOL_FIELD(env, native_config_class, "disableMetrics");
+    native_config->disable_bitmoji = GET_CONFIG_BOOL("disableBitmoji");
+    native_config->disable_metrics = GET_CONFIG_BOOL("disableMetrics");
 
     LOGD("config loaded");
 }
@@ -50,18 +72,12 @@ loadConfig(JNIEnv *env, jobject  clazz, jobject config_object) {
 //jni onload
 extern "C" JNIEXPORT jint JNICALL
 JNI_OnLoad(JavaVM *vm, void *reserved) {
-    LOGD("initializing native");
-    // config
-    native_config = new native_config_t;
-
-    // hooks
-    DobbyHook((void *) fstat_original,(void *) fstat_hook,(void **) &fstat_original);
-
     // register native methods
     JNIEnv *env = nullptr;
     vm->GetEnv((void **) &env, JNI_VERSION_1_6);
 
     auto methods = std::vector<JNINativeMethod>();
+    methods.push_back({"init", "(Ljava/lang/ClassLoader;)V", (void *) init});
     methods.push_back({"loadConfig", "(Lme/rhunk/snapenhance/nativelib/NativeConfig;)V", (void *) loadConfig});
 
     env->RegisterNatives(
@@ -69,8 +85,5 @@ JNI_OnLoad(JavaVM *vm, void *reserved) {
             methods.data(),
             methods.size()
     );
-
-    LOGD("native initialized");
-
     return JNI_VERSION_1_6;
 }

native/jni/src/logger.h

@@ -7,4 +7,5 @@
 #define LOGD(...) __android_log_print(ANDROID_LOG_DEBUG, LOG_TAG, __VA_ARGS__)
 #define LOGI(...) __android_log_print(ANDROID_LOG_INFO,  LOG_TAG, __VA_ARGS__)
 #define LOGW(...) __android_log_print(ANDROID_LOG_WARN,  LOG_TAG, __VA_ARGS__)
+#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR,  LOG_TAG, __VA_ARGS__)
 

native/jni/src/util.h

@@ -0,0 +1,73 @@
+#pragma once
+#include <unistd.h>
+#include <dlfcn.h>
+#include <elf.h>
+
+namespace util {
+    typedef struct {
+        uintptr_t base;
+        size_t size;
+    } ModuleInfo;
+
+    static void hexDump(void* ptr, uint8_t line_length, uint32_t lines) {
+        auto* p = (unsigned char*)ptr;
+        for (uint8_t i = 0; i < lines; i++) {
+            std::string line;
+            for (uint8_t j = 0; j < line_length; j++) {
+                char buf[3];
+                sprintf(buf, "%02x", p[i * line_length + j]);
+                line += buf;
+                line += " ";
+            }
+            LOGI("%s", line.c_str());
+        }
+    }
+
+    static ModuleInfo get_module(const char*  libname)
+    {
+        char path[256];
+        char buff[256];
+        int len_libname = strlen(libname);
+        FILE* file;
+        uintptr_t addr = 0;
+        size_t size = 0;
+
+        snprintf(path, sizeof path, "/proc/%d/smaps", getpid());
+        file = fopen(path, "rt");
+        if (file == NULL)
+            return {0, 0};
+
+        while (fgets(buff, sizeof buff, file) != NULL) {
+            int  len = strlen(buff);
+            if (len > 0 && buff[len-1] == '\n') {
+                buff[--len] = '\0';
+            }
+            if (len <= len_libname || memcmp(buff + len - len_libname, libname, len_libname)) {
+                continue;
+            }
+            size_t start, end, offset;
+            char flags[4];
+            if (sscanf(buff, "%zx-%zx %c%c%c%c %zx", &start, &end,
+                       &flags[0], &flags[1], &flags[2], &flags[3], &offset) != 7) {
+                continue;
+            }
+
+            if (flags[0] != 'r' || flags[2] != 'x') {
+                continue;
+            }
+            addr = start - offset;
+            size = end - start;
+            break;
+        }
+        fclose(file);
+        return {addr, size};
+    }
+
+    void load_library(JNIEnv* env, jobject classLoader, const char* libName) {
+        auto runtimeClass = env->FindClass("java/lang/Runtime");
+        auto getRuntimeMethod = env->GetStaticMethodID(runtimeClass, "getRuntime", "()Ljava/lang/Runtime;");
+        auto runtime = env->CallStaticObjectMethod(runtimeClass, getRuntimeMethod);
+        auto loadLibraryMethod = env->GetMethodID(runtimeClass, "loadLibrary0", "(Ljava/lang/ClassLoader;Ljava/lang/String;)V");
+        env->CallVoidMethod(runtime, loadLibraryMethod, classLoader, env->NewStringUTF(libName));
+    }
+}

native/src/main/kotlin/me/rhunk/snapenhance/nativelib/NativeLib.kt

@@ -1,10 +1,11 @@
 package me.rhunk.snapenhance.nativelib
 
 class NativeLib {
-    fun init() {
+    fun initOnce(classloader: ClassLoader) {
         System.loadLibrary("nativelib")
+        init(classloader)
     }
 
-
+    external fun init(classLoader: ClassLoader)
     external fun loadConfig(config: NativeConfig)
 }