| /* |
| * Copyright (c) 2003, 2018, 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 <stdarg.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include <jvmti.h> |
| #include "agent_common.h" |
| |
| #include "JVMTITools.h" |
| #include "native_thread.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 |
| |
| #ifndef JNI_ENV_ARG1 |
| #ifdef __cplusplus |
| #define JNI_ENV_ARG1(x) |
| #else |
| #define JNI_ENV_ARG1(x) x |
| #endif |
| #endif |
| |
| #define PASSED 0 |
| #define STATUS_FAILED 2 |
| |
| static JavaVM *vm; |
| static jvmtiEnv *jvmti = NULL; |
| |
| static int verbose = 0; |
| |
| static jint result = PASSED; |
| |
| /* the original JNI function table */ |
| static jniNativeInterface *orig_jni_functions = NULL; |
| |
| /* the redirected JNI function table */ |
| static jniNativeInterface *redir_jni_functions = NULL; |
| |
| /* number of the redirected JNI function calls */ |
| static volatile int redir_calls = 0; |
| |
| /** redirected JNI functions **/ |
| jint JNICALL MyGetVersion(JNIEnv *env) { |
| redir_calls++; |
| |
| if (verbose) |
| printf("\nMyGetVersion: the function called successfully: number of calls=%d\n", |
| redir_calls); |
| |
| return orig_jni_functions->GetVersion( |
| JNI_ENV_ARG1(env)); |
| } |
| /*****************************/ |
| |
| static void doRedirect(JNIEnv *env) { |
| jvmtiError err; |
| |
| if (verbose) |
| printf("\ndoRedirect: obtaining the JNI function table ...\n"); |
| if ((err = (*jvmti)->GetJNIFunctionTable(jvmti, &orig_jni_functions)) != |
| JVMTI_ERROR_NONE) { |
| result = STATUS_FAILED; |
| printf("(%s,%d): TEST FAILED: failed to get original JNI function table: %s\n", |
| __FILE__, __LINE__, TranslateError(err)); |
| JNI_ENV_PTR(env)->FatalError(JNI_ENV_ARG(env, |
| "failed to get original JNI function table")); |
| } |
| if ((err = (*jvmti)->GetJNIFunctionTable(jvmti, &redir_jni_functions)) != |
| JVMTI_ERROR_NONE) { |
| result = STATUS_FAILED; |
| printf("(%s,%d): TEST FAILED: failed to get redirected JNI function table: %s\n", |
| __FILE__, __LINE__, TranslateError(err)); |
| JNI_ENV_PTR(env)->FatalError(JNI_ENV_ARG(env, |
| "failed to get redirected JNI function table")); |
| } |
| if (verbose) |
| printf("doRedirect: the JNI function table obtained successfully\n"); |
| |
| if (verbose) |
| printf("\ndoRedirect: overwriting the function GetVersion() ...\n"); |
| redir_jni_functions->GetVersion = MyGetVersion; |
| |
| if ((err = (*jvmti)->SetJNIFunctionTable(jvmti, redir_jni_functions)) != |
| JVMTI_ERROR_NONE) { |
| result = STATUS_FAILED; |
| printf("(%s,%d): TEST FAILED: failed to get new JNI function table: %s\n", |
| __FILE__, __LINE__, TranslateError(err)); |
| JNI_ENV_PTR(env)->FatalError(JNI_ENV_ARG(env, |
| "failed to get new JNI function table")); |
| } |
| |
| if (verbose) |
| printf("\ndoRedirect: the function is overwritten successfully\n"); |
| } |
| |
| static void doRestore(JNIEnv *env) { |
| jvmtiError err; |
| |
| if (verbose) |
| printf("\ndoRestore: restoring the original JNI function table ...\n"); |
| if ((err = (*jvmti)->SetJNIFunctionTable(jvmti, orig_jni_functions)) != |
| JVMTI_ERROR_NONE) { |
| result = STATUS_FAILED; |
| printf("(%s,%d): TEST FAILED: failed to restore original JNI function table: %s\n", |
| __FILE__, __LINE__, TranslateError(err)); |
| JNI_ENV_PTR(env)->FatalError(JNI_ENV_ARG(env, |
| "failed to restore original JNI function table")); |
| } |
| if (verbose) |
| printf("doRestore: the original JNI function table is restored successfully\n"); |
| } |
| |
| static void checkRedir(JNIEnv *env, int exCalls) { |
| jniNativeInterface *tested_jni_functions = NULL; |
| jvmtiError err; |
| jint res; |
| |
| redir_calls = 0; |
| |
| if ((err = (*jvmti)->GetJNIFunctionTable(jvmti, &tested_jni_functions)) != |
| JVMTI_ERROR_NONE) { |
| result = STATUS_FAILED; |
| printf("(%s,%d): TEST FAILED: failed to get modified JNI function table: %s\n", |
| __FILE__, __LINE__, TranslateError(err)); |
| JNI_ENV_PTR(env)->FatalError(JNI_ENV_ARG(env, |
| "failed to get modified JNI function table")); |
| } |
| if (verbose) |
| printf("checkRedir: the JNI function table obtained successfully\n\tcalling GetVersion() ...\n"); |
| res = tested_jni_functions->GetVersion(JNI_ENV_ARG1(env)); |
| |
| if (redir_calls == exCalls) { |
| if (verbose) |
| printf("\nCHECK PASSED: the %s JNI function table is returned by GetJNIFunctionTable():\n\t%d interception of GetVersion() calls as expected\n", |
| (exCalls==0)?"original":"modified", |
| redir_calls); |
| } |
| else { |
| result = STATUS_FAILED; |
| printf("\nTEST FAILED: the %s JNI function table is returned by GetJNIFunctionTable() instead of the %s one:\n\t%d interception of GetVersion() calls instead of %d as expected\n", |
| (exCalls==0)?"modified":"original", |
| (exCalls==0)?"original":"modified", |
| redir_calls, exCalls); |
| } |
| } |
| |
| JNIEXPORT jint JNICALL |
| Java_nsk_jvmti_GetJNIFunctionTable_getjniftab001_check(JNIEnv *env, jobject obj) { |
| int exitCode = PASSED; |
| |
| if (jvmti == NULL) { |
| printf("(%s,%d): TEST FAILURE: JVMTI client was not properly loaded\n", |
| __FILE__, __LINE__); |
| return STATUS_FAILED; |
| } |
| |
| /* 1: check the assertion with the modified function table */ |
| doRedirect(env); |
| if (verbose) |
| printf("\na) Checking the assertion with the modified function table ...\n"); |
| checkRedir(env, 1); |
| |
| /* 2: check the assertion with the original function table */ |
| doRestore(env); |
| if (verbose) |
| printf("\nb) Checking the assertion with the original function table ...\n"); |
| checkRedir(env, 0); |
| |
| return result; |
| } |
| |
| #ifdef STATIC_BUILD |
| JNIEXPORT jint JNICALL Agent_OnLoad_getjniftab001(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNICALL Agent_OnAttach_getjniftab001(JavaVM *jvm, char *options, void *reserved) { |
| return Agent_Initialize(jvm, options, reserved); |
| } |
| JNIEXPORT jint JNI_OnLoad_getjniftab001(JavaVM *jvm, char *options, void *reserved) { |
| return JNI_VERSION_1_8; |
| } |
| #endif |
| jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) { |
| jint res; |
| |
| if (options != NULL && strcmp(options, "-verbose") == 0) |
| verbose = 1; |
| |
| if (verbose) |
| printf("verbose mode on\n"); |
| |
| res = JNI_ENV_PTR(jvm)-> |
| GetEnv(JNI_ENV_ARG(jvm, (void **) &jvmti), JVMTI_VERSION_1_1); |
| if (res != JNI_OK || jvmti == NULL) { |
| printf("(%s,%d): Failed to call GetEnv\n", __FILE__, __LINE__); |
| return JNI_ERR; |
| } |
| |
| return JNI_OK; |
| } |
| |
| #ifdef __cplusplus |
| } |
| #endif |