├── .gitignore ├── LICENSE ├── NativeAgent.dll ├── README.md ├── headers └── me_hp888_nativeagent_instrument_impl_InstrumentationImpl.h └── src └── main ├── cpp ├── NativeAgent.cpp ├── NativeAgent.h └── main.h └── java └── me └── hp888 └── nativeagent ├── AgentBootstrap.java ├── AgentMain.java ├── NativeAccesses.java ├── agent └── Agent.java ├── data └── Settings.java ├── instrument ├── ClassTransformer.java ├── Instrumentation.java └── impl │ └── InstrumentationImpl.java ├── loader └── AgentClassLoader.java ├── transformers └── ExampleTransformer.java └── utils ├── JavaUtil.java └── Reflections.java /.gitignore: -------------------------------------------------------------------------------- 1 | # Created by .ignore support plugin (hsz.mobi) 2 | ### Java template 3 | # Compiled class file 4 | *.class 5 | 6 | # Log file 7 | *.log 8 | 9 | # BlueJ files 10 | *.ctxt 11 | 12 | # Mobile Tools for Java (J2ME) 13 | .mtj.tmp/ 14 | 15 | # Package Files # 16 | *.jar 17 | *.war 18 | *.nar 19 | *.ear 20 | *.zip 21 | *.tar.gz 22 | *.rar 23 | 24 | # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml 25 | hs_err_pid* 26 | 27 | ### C++ template 28 | # Prerequisites 29 | *.d 30 | 31 | # Compiled Object files 32 | *.slo 33 | *.lo 34 | *.o 35 | *.obj 36 | 37 | # Precompiled Headers 38 | *.gch 39 | *.pch 40 | 41 | # Compiled Dynamic libraries 42 | *.so 43 | *.dylib 44 | 45 | # Fortran module files 46 | *.mod 47 | *.smod 48 | 49 | # Compiled Static libraries 50 | *.lai 51 | *.la 52 | *.a 53 | *.lib 54 | 55 | # Executables 56 | *.exe 57 | *.out 58 | *.app 59 | 60 | .idea/ 61 | CustomNativeAgent.iml 62 | dependency-reduced-pom.xml 63 | pom.xml 64 | target/ 65 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /NativeAgent.dll: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/HP888/jvmti-java-agent/8e72678835b2bc1d6d87d3c6e2da5e861df176b1/NativeAgent.dll -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # jvmti-java-agent 2 | 3 | Agent written in c++ for Java 4 | Like basic Java Agent but more lightweight 5 | Currently works only on Windows. 6 | 7 | Default locations: (you can change NativeAgent.dll location in me/hp888/nativeagent/data/Settings) 8 | - C:/agent.jar 9 | - C:/NativeAgent.dll 10 | 11 | (I'm not coding in C++ every day so please don't hate me for bad code) 12 | 13 | # Informations about project 14 | 15 | Project should work on Java 8 and later versions. 16 | 17 | # How to inject agent? 18 | 19 | Download & run ProcessHacker -> PPM on process -> Miscellaneous -> Inject DLL -> Select DLL from C:/NativeAgent.dll 20 | 21 | ![alt text](https://cdn.discordapp.com/attachments/628611450331463690/643546428450406421/processhacker-inject-dll.png) 22 | 23 | # Examples 24 | 25 | ### Getting all loaded Classes 26 | 27 | ``` 28 | public class AgentMain implements Agent 29 | { 30 | @Override 31 | public void onStart(Instrumentation instrumentation) { 32 | System.out.println("[AgentMain] Started agent!"); 33 | Arrays.stream(instrumentation.getAllLoadedClasses()) 34 | .forEach(aClass -> System.out.println("Class name: " + aClass.getName())); 35 | } 36 | 37 | @Override 38 | public void onShutdown() { 39 | System.out.println("[AgentMain] Disabled agent!"); 40 | } 41 | } 42 | ``` 43 | 44 | ### Retransforming Classes 45 | 46 | ``` 47 | public class AgentMain implements Agent 48 | { 49 | @Override 50 | public void onStart(Instrumentation instrumentation) { 51 | System.out.println("[AgentMain] Started agent!"); 52 | instrumentation.addTransformer(new ExampleTransformer()); 53 | instrumentation.retransformClasses(Arrays.stream(instrumentation.getAllLoadedClasses()) 54 | .filter(aClass -> aClass.getName().startsWith("java.lang.Integer")) 55 | .toArray(Class[]::new)); 56 | } 57 | 58 | @Override 59 | public void onShutdown() { 60 | System.out.println("[AgentMain] Disabled agent!"); 61 | } 62 | } 63 | ``` 64 | 65 | ### Class Transformer 66 | ``` 67 | public class ExampleTransformer implements ClassTransformer 68 | { 69 | @Override 70 | public byte[] transform(ClassLoader loader, String className, Class classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) { 71 | if (!classBeingRedefined.getName().equals("java.lang.Integer")) 72 | return classfileBuffer; 73 | 74 | try { 75 | final ClassPool classPool = ClassPool.getDefault(); 76 | final CtClass ctClass = classPool.getCtClass(classBeingRedefined.getName()); 77 | if (ctClass.isFrozen()) 78 | ctClass.detach(); 79 | 80 | final CtMethod ctMethod = ctClass.getDeclaredMethod("valueOf"); 81 | ctMethod.insertBefore("System.err.println(\"[Agent] Hello from CustomNativeAgent!\");"); 82 | 83 | classfileBuffer = ctClass.toBytecode(); 84 | ctClass.detach(); 85 | 86 | Logger.getLogger(getClass().getSimpleName()).info("Successfully retransformed " + classBeingRedefined.getName() + "!"); 87 | } catch (final CannotCompileException | IOException | NotFoundException ex) { 88 | Logger.getLogger(getClass().getSimpleName()).log(Level.SEVERE, "Exception thrown when transforming class!", ex); 89 | } 90 | 91 | return classfileBuffer; 92 | } 93 | } 94 | ``` 95 | 96 | # Things to do 97 | 98 | - fix retransforming many classes (now causes application crash) 99 | - fix onShutdown method (now this method never will be called) 100 | - add more options to instrumentation like removeTransformer 101 | -------------------------------------------------------------------------------- /headers/me_hp888_nativeagent_instrument_impl_InstrumentationImpl.h: -------------------------------------------------------------------------------- 1 | /* DO NOT EDIT THIS FILE - it is machine generated */ 2 | #include 3 | /* Header for class me_hp888_nativeagent_instrument_impl_InstrumentationImpl */ 4 | 5 | #ifndef _Included_me_hp888_nativeagent_instrument_impl_InstrumentationImpl 6 | #define _Included_me_hp888_nativeagent_instrument_impl_InstrumentationImpl 7 | #ifdef __cplusplus 8 | extern "C" { 9 | #endif 10 | /* 11 | * Class: me_hp888_nativeagent_instrument_impl_InstrumentationImpl 12 | * Method: getAllLoadedClasses 13 | * Signature: ()[Ljava/lang/Class; 14 | */ 15 | JNIEXPORT jobjectArray JNICALL Java_me_hp888_nativeagent_instrument_impl_InstrumentationImpl_getAllLoadedClasses 16 | (JNIEnv *, jobject); 17 | 18 | /* 19 | * Class: me_hp888_nativeagent_instrument_impl_InstrumentationImpl 20 | * Method: retransformClasses 21 | * Signature: ([Ljava/lang/Class;)V 22 | */ 23 | JNIEXPORT void JNICALL Java_me_hp888_nativeagent_instrument_impl_InstrumentationImpl_retransformClasses 24 | (JNIEnv *, jobject, jobjectArray); 25 | 26 | /* 27 | * Class: me_hp888_nativeagent_instrument_impl_InstrumentationImpl 28 | * Method: getLoadedClasses 29 | * Signature: (Ljava/lang/ClassLoader;)[Ljava/lang/Class; 30 | */ 31 | JNIEXPORT jobjectArray JNICALL Java_me_hp888_nativeagent_instrument_impl_InstrumentationImpl_getLoadedClasses 32 | (JNIEnv *, jobject, jobject); 33 | 34 | #ifdef __cplusplus 35 | } 36 | #endif 37 | #endif 38 | -------------------------------------------------------------------------------- /src/main/cpp/NativeAgent.cpp: -------------------------------------------------------------------------------- 1 | #include "me_hp888_nativeagent_instrument_impl_InstrumentationImpl.h" 2 | #include "NativeAgent.h" 3 | #include "main.h" 4 | #include 5 | #include 6 | #include "pch.h" 7 | 8 | using namespace std; 9 | 10 | jrawMonitorID vmtrace_lock; 11 | jlong start_time; 12 | 13 | jvmtiEnv* jvmti; 14 | JavaVM* jvm; 15 | JNIEnv* env; 16 | 17 | NativeAgent::NativeAgent() { 18 | jsize count; 19 | if (JNI_GetCreatedJavaVMs((JavaVM * *)& jvm, 1, &count) != JNI_OK || count == 0) { 20 | cout << "Failed to get the JVM" << endl; 21 | return; 22 | } 23 | 24 | jint res = jvm->GetEnv((void**)& env, JNI_VERSION_1_6); 25 | if (res == JNI_EDETACHED) { 26 | res = jvm->AttachCurrentThread((void**)& env, nullptr); 27 | } 28 | 29 | if (res != JNI_OK) { 30 | cout << "Failed to attach to the thread" << endl; 31 | return; 32 | } 33 | 34 | res = jvm->GetEnv((void**)& jvmti, JVMTI_VERSION_1_0); 35 | if (res != JNI_OK) { 36 | cerr << "Failed to get JVMTI env!" << endl; 37 | return; 38 | } 39 | 40 | cout << "[Agent] Attached to JVM" << endl; 41 | cout << "[Agent] Developed by HP888" << endl; 42 | } 43 | 44 | static bool loaded; 45 | static NativeAgent* instance; 46 | 47 | /* utilities */ 48 | 49 | static jmethodID getMethod = NULL, invokeMethod = NULL; 50 | static jclass nativeAccesses = NULL, reflections = NULL; 51 | static string* names = NULL; 52 | 53 | jbyteArray asByteArray(JNIEnv* env, const unsigned char* buf, int len) { 54 | jbyteArray array = env->NewByteArray(len); 55 | env->SetByteArrayRegion(array, 0, len, (const jbyte*)buf); 56 | return array; 57 | } 58 | 59 | unsigned char* asUnsignedCharArray(JNIEnv* env, jbyteArray array) { 60 | int len = env->GetArrayLength(array); 61 | unsigned char* buf = new unsigned char[len]; 62 | env->GetByteArrayRegion(array, 0, len, reinterpret_cast(buf)); 63 | return buf; 64 | } 65 | 66 | static int index, classesToRedefine; 67 | 68 | static int redefine(jvmtiEnv* jvmti, jvmtiClassDefinition* class_def) { 69 | if (!jvmti->RedefineClasses(classesToRedefine, class_def)) 70 | return 0; 71 | 72 | return 1; 73 | } 74 | 75 | /* 76 | // saving classes 77 | 78 | ofstream f; 79 | string s("C:/Users/hp888/OneDrive/Pulpit/test.class"); 80 | f.open(s, std::ios::out | std::ios::binary); 81 | f.write((const char*) newChars, newLength); 82 | f.flush(); 83 | f.close(); 84 | */ 85 | 86 | void JNICALL classTransformerHook(jvmtiEnv* jvmti, JNIEnv* env, jclass class_being_redefined, jobject loader, const char* name, jobject protection_domain, jint data_len, const unsigned char* data, jint* new_data_len, unsigned char** new_data) { 87 | if (name == NULL) 88 | return; 89 | 90 | if (!loaded) { 91 | jvmti->Allocate(data_len, new_data); 92 | 93 | *new_data_len = data_len; 94 | memcpy(*new_data, data, data_len); 95 | } else { 96 | const jclass stringCls = env->FindClass("java/lang/String"); 97 | const jmethodID startsWith = env->GetMethodID(stringCls, "startsWith", "(Ljava/lang/String;)Z"); 98 | const jstring javaClassName = env->NewStringUTF(name), 99 | javaIndexName = env->NewStringUTF(names[index].c_str()); 100 | 101 | if (!env->CallBooleanMethod(javaIndexName, startsWith, javaClassName)) { 102 | jvmti->Allocate(data_len, new_data); 103 | *new_data_len = data_len; 104 | memcpy(*new_data, data, data_len); 105 | return; 106 | } 107 | 108 | jvmti->Allocate(data_len, new_data); 109 | *new_data_len = data_len; 110 | memcpy(*new_data, data, data_len); 111 | 112 | const jobject method = env->CallStaticObjectMethod(reflections, getMethod, nativeAccesses, env->NewStringUTF("transformClass")); 113 | const jclass arrayCls = env->FindClass("java/lang/reflect/Array"); 114 | const jclass object = env->FindClass("java/lang/Object"); 115 | const jmethodID newInstance = env->GetStaticMethodID(arrayCls, "newInstance", "(Ljava/lang/Class;I)Ljava/lang/Object;"); 116 | const jobjectArray newArray = (jobjectArray)env->CallStaticObjectMethod(arrayCls, newInstance, object, (jint)5); 117 | const jbyteArray plainBytes = asByteArray(env, *new_data, *new_data_len); 118 | const jbyteArray byteArray = env->NewByteArray(0); 119 | env->SetObjectArrayElement(newArray, 0, loader); 120 | env->SetObjectArrayElement(newArray, 1, env->NewStringUTF(name)); 121 | env->SetObjectArrayElement(newArray, 2, class_being_redefined); 122 | env->SetObjectArrayElement(newArray, 3, protection_domain); 123 | env->SetObjectArrayElement(newArray, 4, plainBytes); 124 | 125 | const jbyteArray newByteArray = (jbyteArray)env->CallStaticObjectMethod(reflections, invokeMethod, method, NULL, newArray); 126 | unsigned char* newChars = asUnsignedCharArray(env, newByteArray); 127 | const jint newLength = (jint)env->GetArrayLength(newByteArray); 128 | 129 | jvmti->Allocate(newLength, new_data); 130 | *new_data_len = newLength; 131 | memcpy(*new_data, newChars, newLength); 132 | 133 | index++; 134 | jvmtiClassDefinition def = jvmtiClassDefinition(); 135 | redefine(jvmti, &def); 136 | cout << "[Agent] Transformed class: " << name << endl; 137 | } 138 | } 139 | 140 | void initializeJvmti(NativeAgent* agent) { 141 | cout << "[Agent] Setting up JVMTI!" << endl; 142 | 143 | agent->jvmti->CreateRawMonitor("vmtrace_lock", &vmtrace_lock); 144 | agent->jvmti->GetTime(&start_time); 145 | 146 | if (agent->env->ExceptionOccurred()) { 147 | agent->env->ExceptionDescribe(); 148 | return; 149 | } 150 | 151 | jvmtiCapabilities capabilities = { 0 }; 152 | capabilities.can_generate_all_class_hook_events = 1; 153 | capabilities.can_retransform_any_class = 1; 154 | capabilities.can_retransform_classes = 1; 155 | capabilities.can_redefine_any_class = 1; 156 | capabilities.can_redefine_classes = 1; 157 | agent->jvmti->AddCapabilities(&capabilities); 158 | 159 | if (agent->env->ExceptionOccurred()) { 160 | agent->env->ExceptionDescribe(); 161 | return; 162 | } 163 | 164 | cout << "[Agent] JVMTI was set!" << endl; 165 | } 166 | 167 | jbyteArray toByteArray(JNIEnv* env, jobject inputStream) { 168 | const jclass byteArrayOutputStreamClass = env->FindClass("java/io/ByteArrayOutputStream"); 169 | const jclass inputStreamClass = env->FindClass("java/io/InputStream"); 170 | 171 | const jmethodID byteArrayOutputStreamConstructor = env->GetMethodID(byteArrayOutputStreamClass, "", "()V"); 172 | const jmethodID readMethod = env->GetMethodID(inputStreamClass, "read", "([B)I"); 173 | 174 | const jmethodID writeMethod = env->GetMethodID(byteArrayOutputStreamClass, "write", "([BII)V"); 175 | const jmethodID toByteArray = env->GetMethodID(byteArrayOutputStreamClass, "toByteArray", "()[B"); 176 | 177 | const jobject byteArrayOutputStream = env->NewObject(byteArrayOutputStreamClass, byteArrayOutputStreamConstructor); 178 | const jbyteArray buffer = env->NewByteArray(4096); 179 | 180 | jlong count; 181 | jint read; 182 | for (count = 0; (read = env->CallIntMethod(inputStream, readMethod, buffer)) != -1; count += read) { 183 | env->CallVoidMethod(byteArrayOutputStream, writeMethod, buffer, (jint)0, read); 184 | } 185 | 186 | const jbyteArray bytes = (jbyteArray)env->CallObjectMethod(byteArrayOutputStream, toByteArray); 187 | return (jbyteArray)env->CallObjectMethod(byteArrayOutputStream, toByteArray); 188 | } 189 | 190 | jobject addClassesToMap(JNIEnv* env, jstring agentPath) { 191 | const jclass stringCls = env->FindClass("java/lang/String"); 192 | const jstring dotString = env->NewStringUTF("."), 193 | classString = env->NewStringUTF(".class"), 194 | slashString = env->NewStringUTF("/"), 195 | spaceString = env->NewStringUTF(" "), 196 | emptyString = env->NewStringUTF(""); 197 | 198 | const jclass fileClass = env->FindClass("java/io/File"); 199 | const jclass fileInputStream = env->FindClass("java/io/FileInputStream"); 200 | const jmethodID fileConstructor = env->GetMethodID(fileClass, "", "(Ljava/lang/String;)V"); 201 | const jobject fileInstance = env->NewObject(fileClass, fileConstructor, agentPath); 202 | 203 | const jmethodID fileInputStreamConstructor = env->GetMethodID(fileInputStream, "", "(Ljava/io/File;)V"); 204 | const jobject fileInputStreamInstance = env->NewObject(fileInputStream, fileInputStreamConstructor, fileInstance); 205 | 206 | const jclass zipInputStream = env->FindClass("java/util/zip/ZipInputStream"); 207 | const jmethodID zipInputStreamConstructor = env->GetMethodID(zipInputStream, "", "(Ljava/io/InputStream;)V"); 208 | const jobject zipInputStreamInstance = env->NewObject(zipInputStream, zipInputStreamConstructor, fileInputStreamInstance); 209 | const jmethodID getNextEntry = env->GetMethodID(zipInputStream, "getNextEntry", "()Ljava/util/zip/ZipEntry;"); 210 | const jmethodID close = env->GetMethodID(zipInputStream, "close", "()V"); 211 | 212 | const jclass hashMap = env->FindClass("java/util/HashMap"); 213 | const jmethodID hashMapConstructor = env->GetMethodID(hashMap, "", "()V"); 214 | const jmethodID replace = env->GetMethodID(hashMap, "replace", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;"); 215 | const jmethodID containsKey = env->GetMethodID(hashMap, "containsKey", "(Ljava/lang/Object;)Z"); 216 | const jmethodID put = env->GetMethodID(hashMap, "put", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;"); 217 | const jmethodID get = env->GetMethodID(hashMap, "get", "(Ljava/lang/Object;)Ljava/lang/Object;"); 218 | const jmethodID values = env->GetMethodID(hashMap, "values", "()Ljava/util/Collection;"); 219 | const jmethodID keySet = env->GetMethodID(hashMap, "keySet", "()Ljava/util/Set;"); 220 | const jobject classes = env->NewObject(hashMap, hashMapConstructor); 221 | 222 | const jclass zipEntry = env->FindClass("java/util/zip/ZipEntry"); 223 | const jmethodID getName = env->GetMethodID(zipEntry, "getName", "()Ljava/lang/String;"); 224 | const jmethodID isDirectory = env->GetMethodID(zipEntry, "isDirectory", "()Z"); 225 | const jmethodID startsWith = env->GetMethodID(stringCls, "startsWith", "(Ljava/lang/String;)Z"); 226 | 227 | const jmethodID stringReplace = env->GetMethodID(stringCls, "replace", "(Ljava/lang/CharSequence;Ljava/lang/CharSequence;)Ljava/lang/String;"); 228 | const jmethodID contains = env->GetMethodID(stringCls, "contains", "(Ljava/lang/CharSequence;)Z"); 229 | 230 | jobject entry = NULL; 231 | while ((entry = env->CallObjectMethod(zipInputStreamInstance, getNextEntry)) != NULL) { 232 | const jstring name = (jstring)env->CallObjectMethod(entry, getName); 233 | if (!env->CallBooleanMethod(entry, isDirectory) && env->CallBooleanMethod(name, contains, dotString) && !env->CallBooleanMethod(name, startsWith, spaceString) && env->CallBooleanMethod(name, contains, classString)) { 234 | env->CallVoidMethod(classes, put, (jstring)env->CallObjectMethod(env->CallObjectMethod(name, stringReplace, slashString, dotString), stringReplace, classString, emptyString), toByteArray(env, zipInputStreamInstance)); //env->CallStaticObjectMethod(NULL, toByteArray, zipInputStreamInstance)); 235 | if (env->ExceptionOccurred()) { 236 | cout << "Exception thrown when loading agent's classes [zip]" << endl; 237 | env->ExceptionDescribe(); 238 | Sleep(10000L); 239 | } 240 | } 241 | } 242 | 243 | env->CallVoidMethod(zipInputStreamInstance, close); 244 | return classes; 245 | } 246 | 247 | /* end utilities */ 248 | 249 | static jobject defaultClassLoader = NULL; 250 | 251 | void NativeAgent::onAttach(NativeAgent* agent) { 252 | instance = agent; 253 | 254 | AllocConsole(); 255 | SetConsoleCtrlHandler(NULL, true); 256 | FILE* fIn; 257 | FILE* fOut; 258 | freopen_s(&fIn, "conin$", "r", stdin); 259 | freopen_s(&fOut, "conout$", "w", stdout); 260 | freopen_s(&fOut, "conout$", "w", stderr); 261 | 262 | /* definicje */ 263 | 264 | const jclass javaClass = env->FindClass("java/lang/Class"); 265 | const jstring path = env->NewStringUTF("C:/agent.jar"); // Lokalizacja agenta 266 | const jclass loaderClass = env->FindClass("java/lang/ClassLoader"); 267 | const jmethodID loaderMethod = env->GetStaticMethodID(loaderClass, "getSystemClassLoader", "()Ljava/lang/ClassLoader;"); 268 | const jobject classLoader = defaultClassLoader = env->NewGlobalRef(env->CallStaticObjectMethod(loaderClass, loaderMethod)); 269 | 270 | const jclass stringCls = env->FindClass("java/lang/String"); 271 | const jstring dotString = env->NewStringUTF("."); 272 | const jstring emptyString = env->NewStringUTF(""); 273 | const jstring spaceString = env->NewStringUTF(" "); 274 | const jstring classString = env->NewStringUTF(".class"); 275 | const jstring slashString = env->NewStringUTF("/"); 276 | 277 | const jclass jarfileClazz = env->FindClass("java/util/jar/JarFile"); 278 | 279 | const jmethodID contains = env->GetMethodID(stringCls, "contains", "(Ljava/lang/CharSequence;)Z"); 280 | const jmethodID startsWith = env->GetMethodID(stringCls, "startsWith", "(Ljava/lang/String;)Z"); 281 | 282 | const jclass hashMap = env->FindClass("java/util/HashMap"); 283 | 284 | const jmethodID stringReplace = env->GetMethodID(stringCls, "replace", "(Ljava/lang/CharSequence;Ljava/lang/CharSequence;)Ljava/lang/String;"); 285 | const jmethodID hashMapConstructor = env->GetMethodID(hashMap, "", "()V"); 286 | const jmethodID replace = env->GetMethodID(hashMap, "replace", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;"); 287 | const jmethodID containsKey = env->GetMethodID(hashMap, "containsKey", "(Ljava/lang/Object;)Z"); 288 | const jmethodID put = env->GetMethodID(hashMap, "put", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;"); 289 | const jmethodID get = env->GetMethodID(hashMap, "get", "(Ljava/lang/Object;)Ljava/lang/Object;"); 290 | const jmethodID values = env->GetMethodID(hashMap, "values", "()Ljava/util/Collection;"); 291 | const jmethodID keySet = env->GetMethodID(hashMap, "keySet", "()Ljava/util/Set;"); 292 | const jmethodID remove = env->GetMethodID(hashMap, "remove", "(Ljava/lang/Object;)Ljava/lang/Object;"); 293 | 294 | const jclass collection = env->FindClass("java/util/Collection"); 295 | const jmethodID toArray = env->GetMethodID(collection, "toArray", "([Ljava/lang/Object;)[Ljava/lang/Object;"); 296 | 297 | const jobject classMap = addClassesToMap(env, path); 298 | 299 | const jobjectArray classNames = (jobjectArray)env->CallObjectMethod(env->CallObjectMethod(classMap, keySet), toArray, env->NewObjectArray(0, stringCls, NULL)); 300 | const jsize classNamesLength = env->GetArrayLength(classNames); 301 | 302 | for (int i = 0; i < classNamesLength; i++) { 303 | const jstring className = (jstring)env->GetObjectArrayElement(classNames, i); 304 | const jbyteArray byteArray = (jbyteArray)env->CallObjectMethod(classMap, get, className); 305 | if (!env->CallBooleanMethod(className, startsWith, env->NewStringUTF("me.hp888.nativeagent.loader.AgentClassLoader"))) 306 | continue; 307 | 308 | env->DefineClass(env->GetStringUTFChars((jstring)env->CallObjectMethod(className, stringReplace, dotString, slashString), JNI_FALSE), classLoader, env->GetByteArrayElements(byteArray, JNI_FALSE), env->GetArrayLength(byteArray)); 309 | cout << "Loaded class (scl) " << env->GetStringUTFChars(className, JNI_FALSE) << endl; 310 | break; 311 | } 312 | 313 | const jclass agentClassLoader = env->FindClass("me/hp888/nativeagent/loader/AgentClassLoader"); 314 | const jmethodID agentClassLoaderConstructor = env->GetMethodID(agentClassLoader, "", "(Ljava/util/Map;)V"); 315 | const jobject agentClassLoaderInstance = env->NewObject(agentClassLoader, agentClassLoaderConstructor, classMap); 316 | 317 | const jclass fieldClass = env->FindClass("java/lang/reflect/Field"); 318 | const jclass accessibleObjectClass = env->FindClass("java/lang/reflect/AccessibleObject"); 319 | 320 | const jmethodID getDeclaredField = env->GetMethodID(javaClass, "getDeclaredField", "(Ljava/lang/String;)Ljava/lang/reflect/Field;"); 321 | const jmethodID setAccessible = env->GetMethodID(accessibleObjectClass, "setAccessible", "(Z)V"); 322 | const jmethodID set = env->GetMethodID(fieldClass, "set", "(Ljava/lang/Object;Ljava/lang/Object;)V"); 323 | 324 | const jobject systemClassLoaderField = env->CallObjectMethod(loaderClass, getDeclaredField, env->NewStringUTF("scl")); 325 | env->CallVoidMethod(systemClassLoaderField, setAccessible, (jboolean)JNI_TRUE); 326 | env->CallVoidMethod(systemClassLoaderField, set, (jobject)NULL, agentClassLoaderInstance); 327 | cout << "[Agent] Changed application's class loader!" << endl; 328 | 329 | const jmethodID loadClass = env->GetMethodID(agentClassLoader, "loadClass", "(Ljava/lang/String;)Ljava/lang/Class;"); 330 | nativeAccesses = (jclass)env->CallObjectMethod(agentClassLoaderInstance, loadClass, env->NewStringUTF("me.hp888.nativeagent.NativeAccesses")); 331 | 332 | reflections = (jclass)env->CallObjectMethod(agentClassLoaderInstance, loadClass, env->NewStringUTF("me.hp888.nativeagent.utils.Reflections")); 333 | getMethod = env->GetStaticMethodID(reflections, "getMethod", "(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/reflect/Method;"); 334 | invokeMethod = env->GetStaticMethodID(reflections, "invokeMethod", "(Ljava/lang/reflect/Method;Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;"); 335 | 336 | env->CallObjectMethod(classMap, remove, env->CallObjectMethod(env->NewStringUTF("me.hp888.nativeagent.loader.AgentClassLoader"), stringReplace, dotString, slashString)); 337 | 338 | std::cout << "[Agent] Loaded all classes! Starting main class!" << std::endl; 339 | 340 | // inicjalizacja jvmti 341 | 342 | initializeJvmti(agent); 343 | 344 | // uruchamianie agenta 345 | 346 | const jclass instrumentationImpl = (jclass)env->CallObjectMethod(agentClassLoaderInstance, loadClass, env->NewStringUTF("me.hp888.nativeagent.instrument.impl.InstrumentationImpl")); // Instrumentacja 347 | const jmethodID instrumentationImplConstructor = env->GetMethodID(instrumentationImpl, "", "()V"); 348 | const jobject instrumentationInstance = env->NewObject(instrumentationImpl, instrumentationImplConstructor); 349 | 350 | const jclass agentMainClass = (jclass)env->CallObjectMethod(agentClassLoaderInstance, loadClass, env->NewStringUTF("me.hp888.nativeagent.AgentBootstrap")); // Klasa glowna agenta 351 | const jmethodID agentMainMethod = env->GetStaticMethodID(agentMainClass, "startAgent", "(Lme/hp888/nativeagent/instrument/Instrumentation;Ljava/lang/ClassLoader;)V"); // Metoda glowna agenta 352 | 353 | env->CallStaticVoidMethod(agentMainClass, agentMainMethod, instrumentationInstance, agentClassLoaderInstance); // Start agenta 354 | 355 | if (env->ExceptionOccurred()) { 356 | cout << "[Agent] Exception thrown after launching agent!" << endl; 357 | env->ExceptionDescribe(); 358 | return; 359 | } 360 | 361 | // unhook 362 | //jvm->DetachCurrentThread(); 363 | } 364 | 365 | jobjectArray asClassArray(JNIEnv* env, jclass* buf, int len) { 366 | jobjectArray array = env->NewObjectArray(len, env->FindClass("java/lang/Class"), NULL); 367 | 368 | for (int i = 0; i < len; i++) { 369 | env->SetObjectArrayElement(array, i, buf[i]); 370 | } 371 | 372 | return array; 373 | } 374 | 375 | JNIEXPORT jobjectArray JNICALL Java_me_hp888_nativeagent_instrument_impl_InstrumentationImpl_getAllLoadedClasses(JNIEnv* env, jobject instrumentationInstance) { 376 | jclass* jvmClasses; 377 | jint classCount; 378 | 379 | const jint err = instance->jvmti->GetLoadedClasses(&classCount, &jvmClasses); 380 | if (err) { 381 | cout << "Unable to get loaded classes at runtime!" << endl; 382 | return asClassArray(env, jvmClasses, classCount); 383 | } 384 | 385 | return asClassArray(env, jvmClasses, classCount); 386 | } 387 | 388 | JNIEXPORT jobjectArray JNICALL Java_me_hp888_nativeagent_instrument_impl_InstrumentationImpl_getLoadedClasses(JNIEnv* env, jobject instrumentationInstance, jobject classLoader) { 389 | jclass* jvmClasses; 390 | jint classCount; 391 | 392 | const jint err = instance->jvmti->GetClassLoaderClasses(classLoader, &classCount, &jvmClasses); 393 | if (err) { 394 | cout << "Unable to get loaded classes at runtime!" << endl; 395 | return asClassArray(env, jvmClasses, classCount); 396 | } 397 | 398 | return asClassArray(env, jvmClasses, classCount); 399 | } 400 | 401 | JNIEXPORT void JNICALL Java_me_hp888_nativeagent_instrument_impl_InstrumentationImpl_retransformClasses(JNIEnv* env, jobject instrumentationInstance, jobjectArray classes) { 402 | const jclass stringCls = env->FindClass("java/lang/String"); 403 | const jmethodID stringReplace = env->GetMethodID(stringCls, "replace", "(Ljava/lang/CharSequence;Ljava/lang/CharSequence;)Ljava/lang/String;"); 404 | const jstring dotString = env->NewStringUTF("."); 405 | const jstring slashString = env->NewStringUTF("/"); 406 | 407 | const jclass javaClass = env->FindClass("java/lang/Class"); 408 | const jmethodID getName = env->GetMethodID(javaClass, "getName", "()Ljava/lang/String;"); 409 | 410 | jint size = env->GetArrayLength(classes); 411 | jclass* jvmClasses = new jclass[size]; 412 | names = new string[size]; 413 | 414 | for (int index = 0; index < size; index++) { 415 | jvmClasses[index] = (jclass)env->GetObjectArrayElement(classes, index); 416 | names[index] = env->GetStringUTFChars((jstring)env->CallObjectMethod((jstring)env->CallObjectMethod(jvmClasses[index], getName), stringReplace, dotString, slashString), JNI_FALSE); 417 | } 418 | 419 | cout << "[Agent] Retransforming " << size << " classes.." << endl; 420 | 421 | loaded = true; 422 | classesToRedefine = size; 423 | jvmtiEventCallbacks callbacks = { 0 }; 424 | callbacks.ClassFileLoadHook = classTransformerHook; 425 | instance->jvmti->SetEventCallbacks(&callbacks, sizeof(callbacks)); 426 | instance->jvmti->SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL); 427 | 428 | instance->jvmti->RetransformClasses(size, jvmClasses); 429 | 430 | index = 0; 431 | loaded = false; 432 | instance->jvmti->SetEventNotificationMode(JVMTI_DISABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL); 433 | cout << "[Agent] Retransformed " << size << " classes." << endl; 434 | } -------------------------------------------------------------------------------- /src/main/cpp/NativeAgent.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | 3 | #include "main.h" 4 | 5 | class NativeAgent 6 | { 7 | public: 8 | /* functions */ 9 | 10 | NativeAgent(); 11 | void onAttach(NativeAgent* agent); 12 | 13 | /* variables */ 14 | 15 | jvmtiEnv* jvmti; 16 | JavaVM* jvm; 17 | JNIEnv* env; 18 | }; -------------------------------------------------------------------------------- /src/main/cpp/main.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | 3 | #include 4 | 5 | #define WIN32_LEAN_AND_MEAN 6 | #include 7 | 8 | #include 9 | #include 10 | #include 11 | 12 | #define _USE_MATH_DEFINES 13 | #include -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/AgentBootstrap.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent; 2 | 3 | import me.hp888.nativeagent.instrument.Instrumentation; 4 | import java.lang.reflect.Field; 5 | import java.util.Objects; 6 | 7 | /** 8 | * @author hp888 on 10.11.2019. 9 | */ 10 | 11 | public final class AgentBootstrap 12 | { 13 | private static AgentMain agent; 14 | 15 | private AgentBootstrap() {} 16 | 17 | public static void startAgent(final Instrumentation instrumentation, final ClassLoader classLoader) throws Throwable { 18 | final Field systemClassLoaderSetField = ClassLoader.class.getDeclaredField("sclSet"); 19 | systemClassLoaderSetField.setAccessible(true); 20 | systemClassLoaderSetField.set(null, true); 21 | 22 | final Field systemClassLoaderField = ClassLoader.class.getDeclaredField("scl"); 23 | systemClassLoaderField.setAccessible(true); 24 | systemClassLoaderField.set(null, classLoader); 25 | 26 | agent = new AgentMain(); 27 | agent.onStart(instrumentation); 28 | } 29 | 30 | public static void disableAgent() { 31 | if (Objects.isNull(agent)) 32 | return; 33 | 34 | agent.onShutdown(); 35 | } 36 | } -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/AgentMain.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent; 2 | 3 | import me.hp888.nativeagent.agent.Agent; 4 | import me.hp888.nativeagent.instrument.Instrumentation; 5 | import me.hp888.nativeagent.transformers.ExampleTransformer; 6 | import java.util.Arrays; 7 | 8 | /** 9 | * @author hp888 on 10.11.2019. 10 | */ 11 | 12 | public class AgentMain implements Agent 13 | { 14 | @Override 15 | public void onStart(Instrumentation instrumentation) { 16 | System.out.println("[AgentMain] Started agent!"); 17 | instrumentation.addTransformer(new ExampleTransformer()); 18 | instrumentation.retransformClasses(Arrays.stream(instrumentation.getAllLoadedClasses()) 19 | .filter(aClass -> aClass.getName().startsWith("java.lang.Integer")) 20 | .toArray(Class[]::new)); 21 | } 22 | 23 | @Override 24 | public void onShutdown() { 25 | System.out.println("[AgentMain] Disabled agent!"); 26 | } 27 | } -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/NativeAccesses.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent; 2 | 3 | import me.hp888.nativeagent.instrument.ClassTransformer; 4 | import me.hp888.nativeagent.utils.JavaUtil; 5 | import java.security.ProtectionDomain; 6 | import java.util.HashSet; 7 | import java.util.Objects; 8 | import java.util.Set; 9 | import java.util.concurrent.atomic.AtomicReference; 10 | 11 | /** 12 | * @author hp888 on 10.11.2019. 13 | */ 14 | 15 | public class NativeAccesses 16 | { 17 | private static final Set transformers = new HashSet<>(); 18 | 19 | private static ClassTransformer[] transformersArray; 20 | private static boolean modified; 21 | 22 | private NativeAccesses() {} 23 | 24 | public static void addTransformer(final ClassTransformer classTransformer) { 25 | transformers.add(classTransformer); 26 | modified = true; 27 | } 28 | 29 | public static byte[] transformClass(final ClassLoader loader, final String className, final Class classBeingRedefined, final ProtectionDomain protectionDomain, final byte[] classfileBuffer) { 30 | if (classBeingRedefined == null) 31 | return classfileBuffer; 32 | 33 | final AtomicReference atomicReference = new AtomicReference<>(); 34 | transformers.forEach(classTransformer -> { 35 | final byte[] newByteArray = classTransformer.transform(loader, className, classBeingRedefined, protectionDomain, classfileBuffer); 36 | if (Objects.isNull(atomicReference.get())) { 37 | atomicReference.set(newByteArray); 38 | return; 39 | } 40 | 41 | if (JavaUtil.equals(atomicReference.get(), newByteArray)) 42 | return; 43 | 44 | atomicReference.set(newByteArray); 45 | }); 46 | 47 | return atomicReference.get(); 48 | } 49 | 50 | public static ClassTransformer[] getTransformersAsArray() { 51 | if (modified) { 52 | modified = false; 53 | transformersArray = transformers.toArray(new ClassTransformer[0]); 54 | return transformersArray; 55 | } 56 | 57 | return transformersArray == null 58 | ? transformersArray = transformers.toArray(new ClassTransformer[0]) 59 | : transformersArray; 60 | } 61 | } -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/agent/Agent.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent.agent; 2 | 3 | import me.hp888.nativeagent.instrument.Instrumentation; 4 | 5 | /** 6 | * @author hp888 on 10.11.2019. 7 | */ 8 | 9 | public interface Agent 10 | { 11 | void onStart(final Instrumentation instrumentation); 12 | 13 | void onShutdown(); 14 | } -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/data/Settings.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent.data; 2 | 3 | /** 4 | * @author hp888 on 11.11.2019. 5 | */ 6 | 7 | public final class Settings 8 | { 9 | private Settings() {} 10 | 11 | public static final String native_path = "C:\\NativeAgent.dll"; 12 | } -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/instrument/ClassTransformer.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent.instrument; 2 | 3 | import java.security.ProtectionDomain; 4 | 5 | /** 6 | * @author hp888 on 10.11.2019. 7 | */ 8 | 9 | public interface ClassTransformer 10 | { 11 | byte[] transform(final ClassLoader loader, final String className, final Class classBeingRedefined, final ProtectionDomain protectionDomain, final byte[] classfileBuffer); 12 | } -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/instrument/Instrumentation.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent.instrument; 2 | 3 | /** 4 | * @author hp888 on 10.11.2019. 5 | */ 6 | 7 | public interface Instrumentation 8 | { 9 | Class[] getAllLoadedClasses(); 10 | 11 | ClassTransformer[] getTransformers(); 12 | 13 | void retransformClasses(final Class[] classes); 14 | 15 | Class[] getLoadedClasses(final ClassLoader classLoader); 16 | 17 | void addTransformer(final ClassTransformer classTransformer); 18 | } -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/instrument/impl/InstrumentationImpl.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent.instrument.impl; 2 | 3 | import me.hp888.nativeagent.NativeAccesses; 4 | import me.hp888.nativeagent.data.Settings; 5 | import me.hp888.nativeagent.instrument.ClassTransformer; 6 | import me.hp888.nativeagent.instrument.Instrumentation; 7 | import java.io.File; 8 | 9 | /** 10 | * @author hp888 on 10.11.2019. 11 | */ 12 | 13 | public class InstrumentationImpl implements Instrumentation 14 | { 15 | static { 16 | final File file = new File(Settings.native_path); 17 | if (!file.exists()) { 18 | System.err.println("Dynamic link library not found in " + Settings.native_path + "!"); 19 | throw new IllegalArgumentException("Dynamic link library not found in " + Settings.native_path + "!"); 20 | } 21 | 22 | System.load(file.getAbsolutePath()); 23 | } 24 | 25 | @Override 26 | public ClassTransformer[] getTransformers() { 27 | return NativeAccesses.getTransformersAsArray(); 28 | } 29 | 30 | @Override 31 | public native Class[] getAllLoadedClasses(); 32 | 33 | @Override 34 | public native void retransformClasses(Class[] classes); 35 | 36 | @Override 37 | public native Class[] getLoadedClasses(ClassLoader classLoader); 38 | 39 | @Override 40 | public void addTransformer(final ClassTransformer classTransformer) { 41 | NativeAccesses.addTransformer(classTransformer); 42 | } 43 | } -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/loader/AgentClassLoader.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent.loader; 2 | 3 | import java.util.concurrent.ConcurrentHashMap; 4 | import java.net.URLClassLoader; 5 | import java.util.Objects; 6 | import java.util.Map; 7 | import java.net.URL; 8 | 9 | /** 10 | * @author hp888 on 10.11.2019. 11 | */ 12 | 13 | public class AgentClassLoader extends URLClassLoader 14 | { 15 | private final Map classBytes; 16 | private final Map> classes; 17 | 18 | public AgentClassLoader(final Map classes) { 19 | super(new URL[0], ClassLoader.getSystemClassLoader()); 20 | this.classes = new ConcurrentHashMap<>(); 21 | this.classBytes = classes; 22 | } 23 | 24 | @Override 25 | public Class loadClass(String name) throws ClassNotFoundException { 26 | Class aClass = classes.get(name); 27 | if (Objects.nonNull(aClass)) 28 | return aClass; 29 | 30 | final byte[] bytes = classBytes.remove(name); 31 | if (Objects.nonNull(bytes)) 32 | classes.put(name, aClass = defineClass(name, bytes, 0, bytes.length)); 33 | 34 | return Objects.nonNull(aClass) 35 | ? aClass 36 | : super.loadClass(name); 37 | } 38 | } -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/transformers/ExampleTransformer.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent.transformers; 2 | 3 | import me.hp888.nativeagent.instrument.ClassTransformer; 4 | import java.security.ProtectionDomain; 5 | import java.io.IOException; 6 | import java.util.logging.Level; 7 | import java.util.logging.Logger; 8 | import javassist.*; 9 | 10 | /** 11 | * @author hp888 on 10.11.2019. 12 | */ 13 | 14 | public class ExampleTransformer implements ClassTransformer 15 | { 16 | @Override 17 | public byte[] transform(ClassLoader loader, String className, Class classBeingRedefined, ProtectionDomain protectionDomain, byte[] classfileBuffer) { 18 | if (!classBeingRedefined.getName().equals("java.lang.Integer")) 19 | return classfileBuffer; 20 | 21 | try { 22 | final ClassPool classPool = ClassPool.getDefault(); 23 | final CtClass ctClass = classPool.getCtClass(classBeingRedefined.getName()); 24 | if (ctClass.isFrozen()) 25 | ctClass.detach(); 26 | 27 | final CtMethod ctMethod = ctClass.getDeclaredMethod("valueOf"); 28 | ctMethod.insertBefore("System.err.println(\"[Agent] Hello from CustomNativeAgent!\");"); 29 | 30 | classfileBuffer = ctClass.toBytecode(); 31 | ctClass.detach(); 32 | 33 | Logger.getLogger(getClass().getSimpleName()).info("Successfully retransformed " + classBeingRedefined.getName() + "!"); 34 | } catch (final CannotCompileException | IOException | NotFoundException ex) { 35 | Logger.getLogger(getClass().getSimpleName()).log(Level.SEVERE, "Exception thrown when transforming class!", ex); 36 | } 37 | 38 | return classfileBuffer; 39 | } 40 | } -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/utils/JavaUtil.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent.utils; 2 | 3 | import java.util.Arrays; 4 | import java.util.Stack; 5 | 6 | /** 7 | * @author hp888 on 11.11.2019. 8 | */ 9 | 10 | public final class JavaUtil 11 | { 12 | private JavaUtil() {} 13 | 14 | public static boolean equals(final byte[] firstByteArray, final byte[] secondByteArray) { 15 | if (firstByteArray.length != secondByteArray.length) 16 | return false; 17 | 18 | for (int i = 0; i < firstByteArray.length; i++) { 19 | if (firstByteArray[i] != secondByteArray[i]) 20 | return false; 21 | } 22 | 23 | return true; 24 | } 25 | 26 | static void printStacktrace(final Throwable throwable) { 27 | System.err.println("Exception: " + throwable.toString()); 28 | Arrays.stream(throwable.getStackTrace()).forEach(stackTraceElement -> System.err.println(" at " + stackTraceElement.getClassName() + "." + stackTraceElement.getMethodName() + " (" + stackTraceElement.getFileName() + ":" + stackTraceElement.getLineNumber() + ")")); 29 | 30 | final Stack throwableStack = new Stack<>(); 31 | throwableStack.push(throwable.getCause()); 32 | 33 | while (!throwableStack.empty()) { 34 | final Throwable newThrowable = throwableStack.pop(); 35 | if (newThrowable.getCause() == null) { 36 | System.err.println("Exception: " + newThrowable.toString()); 37 | Arrays.stream(throwable.getStackTrace()).forEach(stackTraceElement -> System.err.println(" at " + stackTraceElement.getClassName() + "." + stackTraceElement.getMethodName() + " (" + stackTraceElement.getFileName() + ":" + stackTraceElement.getLineNumber() + ")")); 38 | break; 39 | } 40 | 41 | System.err.println("Exception: " + newThrowable.toString()); 42 | Arrays.stream(throwable.getStackTrace()).forEach(stackTraceElement -> System.err.println("at " + stackTraceElement.getClassName() + "." + stackTraceElement.getMethodName() + " (" + stackTraceElement.getFileName() + ":" + stackTraceElement.getLineNumber() + ")")); 43 | } 44 | } 45 | } -------------------------------------------------------------------------------- /src/main/java/me/hp888/nativeagent/utils/Reflections.java: -------------------------------------------------------------------------------- 1 | package me.hp888.nativeagent.utils; 2 | 3 | import java.lang.reflect.Method; 4 | import java.util.Arrays; 5 | 6 | /** 7 | * @author hp888 on 10.11.2019. 8 | */ 9 | 10 | public final class Reflections 11 | { 12 | private Reflections() {} 13 | 14 | public static Method getMethod(final Class aClass, final String name) { 15 | try { 16 | for (final Method method : aClass.getMethods()) { 17 | if (method.getName().equals(name)) { 18 | return method; 19 | } 20 | } 21 | 22 | return null; 23 | } catch (final Throwable throwable) { 24 | JavaUtil.printStacktrace(throwable); 25 | } 26 | 27 | return null; 28 | } 29 | 30 | public static Object invokeMethod(final Method method, final Object instance, final Object... args) { 31 | try { 32 | if (method == null) { 33 | System.err.println("Method == null, args: " + Arrays.toString(args)); 34 | return null; 35 | } 36 | 37 | return method.invoke(instance, args); 38 | } catch (final Throwable throwable) { 39 | JavaUtil.printStacktrace(throwable); 40 | } 41 | 42 | return null; 43 | } 44 | } --------------------------------------------------------------------------------