| /* |
| * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| #include <stdio.h> |
| #include <string.h> |
| #include "jvmti.h" |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| #ifndef JNI_ENV_ARG |
| |
| #ifdef __cplusplus |
| #define JNI_ENV_ARG(x, y) y |
| #define JNI_ENV_PTR(x) x |
| #else |
| #define JNI_ENV_ARG(x,y) x, y |
| #define JNI_ENV_PTR(x) (*x) |
| #endif |
| |
| #endif |
| |
| #define TranslateError(err) "JVMTI error" |
| |
| #define PASSED 0 |
| #define FAILED 2 |
| |
| static const char *EXPECTED_NAME = "java/util/Collections"; |
| static const char *EXC_CNAME = "java/lang/Exception"; |
| |
| static jvmtiEnv *jvmti = NULL; |
| static jint result = PASSED; |
| static jboolean printdump = JNI_FALSE; |
| |
| static jboolean with_early_vm_start_capability = JNI_FALSE; |
| static jboolean with_early_class_hook_capability = JNI_FALSE; |
| |
| static jboolean found_class_in_vm_start = JNI_FALSE; |
| static jboolean found_class_in_primordial = JNI_FALSE; |
| static jboolean found_class_in_cflh_events = JNI_FALSE; |
| |
| static int cflh_events_primordial_count = 0; |
| static int cflh_events_vm_start_count = 0; |
| |
| static jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved); |
| |
| JNIEXPORT |
| jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| |
| JNIEXPORT |
| jint JNICALL Agent_OnAttach(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| |
| JNIEXPORT |
| jint JNICALL JNI_OnLoad(JavaVM *jvm, void *reserved) { |
| return JNI_VERSION_9; |
| } |
| |
| static |
| jint throw_exc(JNIEnv *env, char *msg) { |
| jclass exc_class = JNI_ENV_PTR(env)->FindClass(JNI_ENV_ARG(env, EXC_CNAME)); |
| |
| if (exc_class == NULL) { |
| printf("throw_exc: Error in FindClass(env, %s)\n", EXC_CNAME); |
| return -1; |
| } |
| return JNI_ENV_PTR(env)->ThrowNew(JNI_ENV_ARG(env, exc_class), msg); |
| } |
| |
| static void JNICALL |
| Callback_ClassFileLoadHook(jvmtiEnv *jvmti_env, JNIEnv *env, |
| jclass class_being_redefined, |
| jobject loader, const char* name, jobject protection_domain, |
| jint class_data_len, const unsigned char* class_data, |
| jint *new_class_data_len, unsigned char** new_class_data) { |
| jvmtiPhase phase; |
| jvmtiError err; |
| |
| err = (*jvmti)->GetPhase(jvmti_env, &phase); |
| if (err != JVMTI_ERROR_NONE) { |
| printf("ClassFileLoadHook event: GetPhase error: %s (%d)\n", TranslateError(err), err); |
| result = FAILED; |
| return; |
| } |
| |
| if (phase == JVMTI_PHASE_PRIMORDIAL || phase == JVMTI_PHASE_START) { |
| if (phase == JVMTI_PHASE_START) { |
| cflh_events_vm_start_count++; |
| if(strcmp(name, EXPECTED_NAME) == 0) { |
| found_class_in_vm_start = JNI_TRUE; |
| } |
| } else { |
| cflh_events_primordial_count++; |
| if(strcmp(name, EXPECTED_NAME) == 0) { |
| found_class_in_primordial = JNI_TRUE; |
| } |
| } |
| } |
| |
| if(strcmp(name, EXPECTED_NAME) == 0) { |
| found_class_in_cflh_events = JNI_TRUE; |
| } |
| |
| if (printdump == JNI_TRUE) { |
| printf(">>> ClassFileLoadHook event: phase(%d), class name %s\n", phase, name); |
| } |
| } |
| |
| static |
| jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) { |
| jint res, size; |
| jvmtiCapabilities caps; |
| jvmtiEventCallbacks callbacks; |
| jvmtiError err; |
| |
| printf("agent options: %s\n", options); |
| if (options != NULL) { |
| if (strstr(options, "with_early_vmstart") != NULL) { |
| with_early_vm_start_capability = JNI_TRUE; |
| } |
| if (strstr(options, "with_early_class_hook") != NULL) { |
| with_early_class_hook_capability = JNI_TRUE; |
| } |
| if (strstr(options, "printdump") != NULL) { |
| printdump = JNI_TRUE; |
| } |
| } |
| |
| res = JNI_ENV_PTR(jvm)->GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti), |
| JVMTI_VERSION_9); |
| if (res != JNI_OK || jvmti == NULL) { |
| printf(" Error: wrong result of a valid call to GetEnv!\n"); |
| return JNI_ERR; |
| } |
| |
| printf("Enabling following capabilities: can_generate_all_class_hook_events"); |
| memset(&caps, 0, sizeof(caps)); |
| caps.can_generate_all_class_hook_events = 1; |
| if (with_early_vm_start_capability == JNI_TRUE) { |
| printf(", can_generate_early_vmstart"); |
| caps.can_generate_early_vmstart = 1; |
| } |
| if (with_early_class_hook_capability == JNI_TRUE) { |
| printf(", can_generate_early_class_hook_events"); |
| caps.can_generate_early_class_hook_events = 1; |
| } |
| printf("\n"); |
| |
| err = (*jvmti)->AddCapabilities(jvmti, &caps); |
| if (err != JVMTI_ERROR_NONE) { |
| printf(" Error in AddCapabilites: %s (%d)\n", TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| size = (jint)sizeof(callbacks); |
| |
| memset(&callbacks, 0, sizeof(callbacks)); |
| callbacks.ClassFileLoadHook = Callback_ClassFileLoadHook; |
| |
| err = (*jvmti)->SetEventCallbacks(jvmti, &callbacks, size); |
| if (err != JVMTI_ERROR_NONE) { |
| printf(" Error in SetEventCallbacks: %s (%d)\n", TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| err = (*jvmti)->SetEventNotificationMode(jvmti, JVMTI_ENABLE, JVMTI_EVENT_CLASS_FILE_LOAD_HOOK, NULL); |
| if (err != JVMTI_ERROR_NONE) { |
| printf(" Error in SetEventNotificationMode: %s (%d)\n", TranslateError(err), err); |
| return JNI_ERR; |
| } |
| |
| return JNI_OK; |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_MAAClassFileLoadHook_check(JNIEnv *env, jclass cls) { |
| jobject loader = NULL; |
| |
| if (jvmti == NULL) { |
| throw_exc(env, "JVMTI client was not properly loaded!\n"); |
| return FAILED; |
| } |
| |
| /* |
| * Expecting ClassFileLoadHook events in the VM Start phase if early_vm_start is enabled. |
| */ |
| if (with_early_vm_start_capability == JNI_TRUE && cflh_events_vm_start_count == 0) { |
| throw_exc(env, "Didn't get ClassFileLoadHook events in start phase!\n"); |
| return FAILED; |
| } |
| |
| if (with_early_class_hook_capability == JNI_TRUE) { |
| /* |
| * Expecting that we get ClassFileLoadHook events in the Primordial phase |
| * when can_generate_all_class_hook_events and can_generate_early_class_hook_events |
| * capabilities are enabled. |
| */ |
| if (cflh_events_primordial_count == 0) { |
| throw_exc(env, "Didn't get ClassFileLoadHook events in primordial phase!\n"); |
| return FAILED; |
| } |
| } else { |
| /* |
| * Expecting that we don't get ClassFileLoadHook events in the Primordial phase |
| * when can_generate_early_class_hook_events capability is disabled. |
| */ |
| if (cflh_events_primordial_count != 0) { |
| throw_exc(env, "Get ClassFileLoadHook events in primordial phase!\n"); |
| return FAILED; |
| } |
| } |
| |
| |
| if (with_early_vm_start_capability == JNI_TRUE) { |
| /* |
| * Expecting that "java/util/Collections" class from java.base module is present in the |
| * ClassFileLoadHook events during VM Start phase when can_generate_early_vmstart |
| * capability is enabled. |
| */ |
| printf("Expecting to find '%s' class in ClassFileLoadHook events during VM early start phase.\n", EXPECTED_NAME); |
| if (found_class_in_vm_start == JNI_FALSE) { |
| throw_exc(env, "Unable to find expected class in ClassLoad events during VM early start phase!\n"); |
| return FAILED; |
| } |
| } else if (with_early_class_hook_capability == JNI_TRUE) { |
| /* |
| * Expecting that "java/util/Collections" class from java.base module is present in the |
| * ClassFileLoadHook events during Primordial phase when can_generate_all_class_hook_events |
| * and can_generate_early_class_hook_events capabilities are enabled and can_generate_early_vmstart |
| * capability is disabled. |
| */ |
| printf("Expecting to find '%s' class in ClassFileLoadHook events during VM primordial phase.\n", EXPECTED_NAME); |
| if (found_class_in_primordial == JNI_FALSE) { |
| throw_exc(env, "Unable to find expected class in ClassFileLoadHook events during primordial phase!\n"); |
| return FAILED; |
| } |
| } else { |
| /* |
| * Expecting that "java/util/Collections" class from java.base module is not present in the |
| * ClassFileLoadHook events when can_generate_all_class_hook_events, can_generate_early_class_hook_events |
| * and can_generate_early_vmstart capabilities are disabled. |
| */ |
| printf("Expecting that '%s' class is absent in ClassLoadHook events.\n", EXPECTED_NAME); |
| if (found_class_in_cflh_events == JNI_TRUE) { |
| throw_exc(env, "Class is found in ClassFileLoadHook events!\n"); |
| return FAILED; |
| } |
| } |
| |
| return result; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |
