当我尝试将 jar 文件注入正在运行的 java 进程时，我得到了
NoClassDefFoundErrorJar 文件字节：
static const unsigned char lib_bytes[] = {
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static const int lib_size = sizeof(lib_bytes);
jar 文件中有什么：
package me.zedik;
import net.minecraft.client.Minecraft;
public class HackClassPatcher {
public static void doStuffIdk() {
Minecraft.getMinecraft().thePlayer.capabilities.allowFlying = true;
System.out.println("hi lol");
}
// some other random stuff
}
注入代码：
// use miniz to extract class files from jar file
void JavaUtils::loadJar(jobject classLoader, const unsigned char *jarBytes, size_t size) {
mz_zip_archive archive{};
if (!mz_zip_reader_init_mem(&archive, jarBytes, size, 0)) return;
mz_uint file_number = mz_zip_reader_get_num_files(&archive);
for (mz_uint i = 0; i < file_number; i++) {
if (!mz_zip_reader_is_file_supported(&archive, i)) continue;
char str[256] = {0};
mz_zip_reader_get_filename(&archive, i, str, 256);
std::string fileName(str);
if (fileName.size() <= 6) continue;
if (fileName.substr(fileName.size() - 6) != ".class") continue;
size_t classBytes_size = 0;
unsigned char *classBytes = (unsigned char*) mz_zip_reader_extract_to_heap(&archive, i, &classBytes_size, 0);
if (!classBytes) {
mz_zip_reader_end(&archive);
return;
}
jclass jaclass = client->env->DefineClass(nullptr, classLoader, (const jbyte*) classBytes, (jsize) classBytes_size);
if (jaclass) client->env->DeleteLocalRef(jaclass);
mz_free(classBytes);
}
mz_zip_reader_end(&archive);
}
// creates a new class loader to load the injected classes
jobject JavaUtils::newClassLoader() {
jclass urlClass = client->env->FindClass("java/net/URL");
jobjectArray urls = client->env->NewObjectArray(0, urlClass, nullptr);
jclass URLClassLoaderClass = client->env->FindClass("java/net/URLClassLoader");
jmethodID URLClassLoaderContructor = client->env->GetMethodID(URLClassLoaderClass, "<init>", "([Ljava/net/URL;)V");
jobject URLClassLoader = client->env->NewObject(URLClassLoaderClass, URLClassLoaderContructor, urls);
client->env->DeleteLocalRef(urlClass);
client->env->DeleteLocalRef(urls);
client->env->DeleteLocalRef(URLClassLoaderClass);
return URLClassLoader;
}
我注入罐子的地方：
jobject classLoader = JavaUtils::newClassLoader();
JavaUtils::loadJar(classLoader, lib_bytes, lib_size);
调用方法：
jclass libClass = client->getClass("me.zedik.HackClassPatcher");
if (libClass == nullptr) {
std::cout << "hack patcher class not found" << std::endl;
return;
}
jmethodID libMethod = client->env->GetStaticMethodID(libClass, "doStuffIdk", "()V");
if (libMethod == nullptr) {
std::cout << "hack method not found" << std::endl;
return;
}
client->env->CallStaticVoidMethod(libClass, libMethod);
std::cout << "success" << std::endl;
if (client->env->ExceptionCheck() == JNI_TRUE) {
std::cout << "EXCEPTION" << std::endl;
jthrowable exception = client->env->ExceptionOccurred();
client->env->ExceptionClear();
JavaUtils::getInformation(exception); // prints stack trace
return;
}
输出：
EXCEPTION:
java.lang.NoClassDefFoundError: net/minecraft/client/Minecraft
me.zedik.HackClassPatcher.doStuffIdk(HackClassPatcher.java:8)
Caused by: java.lang.ClassNotFoundException: net.minecraft.client.Minecraft
java.base/java.net.URLClassLoader.findClass(Unknown Source)
java.base/java.lang.ClassLoader.loadClass(Unknown Source)
java.base/java.lang.ClassLoader.loadClass(Unknown Source)
me.zedik.HackClassPatcher.doStuffIdk(HackClassPatcher.java:8)
net/minecraft/client/Minecraft感谢 0x150，我为有同样问题的人找到了解决方案。 只需从随机类中获取类加载器即可。
jobject JavaUtils::getClassLoader() {
std::cout << "Getting class loader" << std::endl;
jclass classClass = client->getClass("java.lang.Class");
jclass mcClass = client->getClass("net.minecraft.client.Minecraft");
jmethodID getClassLoader = client->env->GetMethodID(classClass, "getClassLoader", "()Ljava/lang/ClassLoader;");
jobject classLoader = client->env->CallObjectMethod(mcClass, getClassLoader);
return classLoader;
}