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270 lines (238 loc) · 10.1 KB
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#include <iostream>
#include "lib.h"
const std::string LEVEL_STRINGS[] = {
"TRACE",
"DEBUG",
"INFO",
"WARN",
"ERROR"
};
Level LOG_LEVEL = WARN;
void log(Level level, std::string message) {
if (level >= LOG_LEVEL) {
std::cerr << LEVEL_STRINGS[level] << " [Sentry Agent]: " << message << std::endl;
}
}
static jint throwException(JNIEnv *env, const char *name, const char *message) {
jclass clazz;
clazz = env->FindClass(name);
return env->ThrowNew(clazz, message);
}
static jobject getLocalValue(jvmtiEnv* jvmti, JNIEnv *env, jthread thread, jint depth,
jvmtiLocalVariableEntry *table, int index) {
jobject result;
jint i_val;
jfloat f_val;
jdouble d_val;
jlong j_val;
jvmtiError jvmti_error;
jclass reflect_class;
jmethodID value_of;
switch (table[index].signature[0]) {
case '[': // Array
case 'L': // Object
jvmti_error = jvmti->GetLocalObject(thread, depth, table[index].slot, &result);
if (jvmti_error != JVMTI_ERROR_NONE || result == nullptr) {
return nullptr;
}
break;
case 'J': // long
jvmti_error = jvmti->GetLocalLong(thread, depth, table[index].slot, &j_val);
break;
case 'F': // float
jvmti_error = jvmti->GetLocalFloat(thread, depth, table[index].slot, &f_val);
break;
case 'D': // double
jvmti_error = jvmti->GetLocalDouble(thread, depth, table[index].slot, &d_val);
break;
case 'I': // int
case 'S': // short
case 'C': // char
case 'B': // byte
case 'Z': // boolean
jvmti_error = jvmti->GetLocalInt(thread, depth, table[index].slot, &i_val);
break;
// error type
default:
return nullptr;
}
if (jvmti_error != JVMTI_ERROR_NONE) {
return nullptr;
}
switch (table[index].signature[0]) {
case 'J': // long
reflect_class = env->FindClass("java/lang/Long");
value_of = env->GetStaticMethodID(reflect_class, "valueOf", "(J)Ljava/lang/Long;");
result = env->CallStaticObjectMethod(reflect_class, value_of, j_val);
break;
case 'F': // float
reflect_class = env->FindClass("java/lang/Float");
value_of = env->GetStaticMethodID(reflect_class, "valueOf", "(F)Ljava/lang/Float;");
result = env->CallStaticObjectMethod(reflect_class, value_of, f_val);
break;
case 'D': // double
reflect_class = env->FindClass("java/lang/Double");
value_of = env->GetStaticMethodID(reflect_class, "valueOf", "(D)Ljava/lang/Double;");
result = env->CallStaticObjectMethod(reflect_class, value_of, d_val);
break;
// INTEGER TYPES
case 'I': // int
reflect_class = env->FindClass("java/lang/Integer");
value_of = env->GetStaticMethodID(reflect_class, "valueOf", "(I)Ljava/lang/Integer;");
result = env->CallStaticObjectMethod(reflect_class, value_of, i_val);
break;
case 'S': // short
reflect_class = env->FindClass("java/lang/Short");
value_of = env->GetStaticMethodID(reflect_class, "valueOf", "(S)Ljava/lang/Short;");
result = env->CallStaticObjectMethod(reflect_class, value_of, i_val);
break;
case 'C': // char
reflect_class = env->FindClass("java/lang/Character");
value_of = env->GetStaticMethodID(reflect_class, "valueOf", "(C)Ljava/lang/Character;");
result = env->CallStaticObjectMethod(reflect_class, value_of, i_val);
break;
case 'B': // byte
reflect_class = env->FindClass("java/lang/Byte");
value_of = env->GetStaticMethodID(reflect_class, "valueOf", "(B)Ljava/lang/Byte;");
result = env->CallStaticObjectMethod(reflect_class, value_of, i_val);
break;
case 'Z': // boolean
reflect_class = env->FindClass("java/lang/Boolean");
value_of = env->GetStaticMethodID(reflect_class, "valueOf", "(Z)Ljava/lang/Boolean;");
result = env->CallStaticObjectMethod(reflect_class, value_of, i_val);
break;
default: // jobject
break;
}
return result;
}
static void makeLocalVariable(jvmtiEnv* jvmti, JNIEnv *env, jthread thread,
jint depth, jclass local_class, jmethodID live_ctor,
jlocation location, jobjectArray locals,
jvmtiLocalVariableEntry *table, int index) {
jstring name;
jobject value;
jobject local;
name = env->NewStringUTF(table[index].name);
if (location >= table[index].start_location && location <= (table[index].start_location + table[index].length)) {
value = getLocalValue(jvmti, env, thread, depth, table, index);
local = env->NewObject(local_class, live_ctor, name, value);
} else {
// dead object, use null
local = nullptr;
}
env->SetObjectArrayElement(locals, index, local);
}
static jobject makeFrameObject(jvmtiEnv* jvmti, JNIEnv *env, jmethodID method, jobjectArray locals) {
jvmtiError jvmti_error;
jclass method_class;
jobject frame_method;
jclass frame_class;
jmethodID ctor;
jvmti_error = jvmti->GetMethodDeclaringClass(method, &method_class);
if (jvmti_error != JVMTI_ERROR_NONE) {
throwException(env, "java/lang/RuntimeException", "Could not get the declaring class of the method.");
return nullptr;
}
frame_method = env->ToReflectedMethod(method_class, method, (jboolean) true);
if (frame_method == nullptr) {
return nullptr; // ToReflectedMethod raised an exception
}
frame_class = env->FindClass("io/sentry/jvmti/Frame");
if (frame_class == nullptr) {
return nullptr;
}
ctor = env->GetMethodID(frame_class, "<init>",
"(Ljava/lang/reflect/Method;[Lio/sentry/jvmti/Frame$LocalVariable;)V");
if (ctor == nullptr) {
return nullptr;
}
return env->NewObject(frame_class, ctor, frame_method, locals);
}
static jobject buildFrame(jvmtiEnv* jvmti, JNIEnv *env, jthread thread, jint depth,
jmethodID method, jlocation location) {
jvmtiError jvmti_error;
jvmtiLocalVariableEntry *local_var_table;
jint num_entries;
jobject value_ptr;
jobjectArray locals;
jclass local_class;
jmethodID live_ctor;
int i;
value_ptr = nullptr;
jvmti_error = jvmti->GetLocalVariableTable(method, &num_entries, &local_var_table);
if (jvmti_error != JVMTI_ERROR_NONE) {
locals = nullptr;
switch(jvmti_error) {
// Pass cases
case JVMTI_ERROR_ABSENT_INFORMATION:
case JVMTI_ERROR_NATIVE_METHOD:
break;
// Error cases
case JVMTI_ERROR_MUST_POSSESS_CAPABILITY:
throwException(env, "java/lang/RuntimeException", "The access_local_variables capability is not enabled.");
return nullptr;
case JVMTI_ERROR_INVALID_METHODID:
throwException(env, "java/lang/IllegalArgumentException", "Illegal jmethodID.");
return nullptr;
case JVMTI_ERROR_NULL_POINTER:
throwException(env, "java/lang/NullPointerException", "Passed null to GetLocalVariableTable().");
return nullptr;
default:
throwException(env, "java/lang/RuntimeException", "Unknown JVMTI Error.");
return nullptr;
}
} else {
local_class = env->FindClass("io/sentry/jvmti/Frame$LocalVariable");
live_ctor = env->GetMethodID(local_class, "<init>", "(Ljava/lang/String;Ljava/lang/Object;)V");
locals = env->NewObjectArray(num_entries, local_class, nullptr);
for (i = 0; i < num_entries; i++) {
makeLocalVariable(jvmti, env, thread, depth, local_class, live_ctor, location, locals, local_var_table, i);
}
jvmti->Deallocate((unsigned char *) local_var_table);
}
jvmti_error = jvmti->GetLocalObject(thread, depth, 0, &value_ptr);
if (jvmti_error != JVMTI_ERROR_NONE) {
value_ptr = nullptr;
}
return makeFrameObject(jvmti, env, method, locals);
}
jobjectArray buildStackTraceFrames(jvmtiEnv* jvmti, JNIEnv *env, jthread thread,
jint start_depth, jint num_frames) {
log(TRACE, "buildStackTraceFrames called.");
jvmtiFrameInfo* frames;
jclass result_class;
jint num_frames_returned;
jvmtiError jvmti_error;
jobjectArray result;
jobject frame;
jvmti_error = jvmti->Allocate(num_frames * (int)sizeof(jvmtiFrameInfo), (unsigned char **) &frames);
if (jvmti_error != JVMTI_ERROR_NONE) {
throwException(env, "java/lang/RuntimeException", "Could not allocate frame buffer.");
return nullptr;
}
jvmti_error = jvmti->GetStackTrace(thread, start_depth, num_frames, frames, &num_frames_returned);
if (jvmti_error != JVMTI_ERROR_NONE) {
jvmti->Deallocate((unsigned char *)frames);
throwException(env, "java/lang/RuntimeException", "Could not get stack trace.");
return nullptr;
}
result_class = env->FindClass("io/sentry/jvmti/Frame");
result = env->NewObjectArray(num_frames_returned, result_class, nullptr);
if (result == nullptr) {
jvmti->Deallocate((unsigned char *) frames);
return nullptr; // OutOfMemory
}
for (int i = 0; i < num_frames_returned; i++) {
frame = buildFrame(jvmti, env, thread, start_depth + i, frames[i].method, frames[i].location);
if (frame == nullptr) {
jvmti->Deallocate((unsigned char *) frames);
throwException(env, "java/lang/RuntimeException", "Error accessing frame object.");
return nullptr;
}
env->SetObjectArrayElement(result, i, frame);
}
jvmti->Deallocate((unsigned char *) frames);
log(TRACE, "buildStackTraceFrames exit.");
return result;
}
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