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/*
* Copyright (c) 2003, 2024, 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.hpp"
#include "JVMTITools.hpp"
#include "native_thread.hpp"
extern "C" {
#define PASSED 0
#define STATUS_FAILED 2
static JavaVM *vm;
static jvmtiEnv *jvmti = nullptr;
static int verbose = 0;
static jint result = PASSED;
/* the original JNI function table */
static jniNativeInterface *orig_jni_functions = nullptr;
/* the redirected JNI function table */
static jniNativeInterface *redir_jni_functions = nullptr;
/* 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(env);
}
/*****************************/
static void doRedirect(JNIEnv *env) {
jvmtiError err;
if (verbose)
printf("\ndoRedirect: obtaining the JNI function table ...\n");
err = jvmti->GetJNIFunctionTable(&orig_jni_functions);
if (err != JVMTI_ERROR_NONE) {
result = STATUS_FAILED;
printf("(%s,%d): TEST FAILED: failed to get original JNI function table: %s\n",
__FILE__, __LINE__, TranslateError(err));
env->FatalError("failed to get original JNI function table");
}
err = jvmti->GetJNIFunctionTable(&redir_jni_functions);
if (err != JVMTI_ERROR_NONE) {
result = STATUS_FAILED;
printf("(%s,%d): TEST FAILED: failed to get redirected JNI function table: %s\n",
__FILE__, __LINE__, TranslateError(err));
env->FatalError("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;
err = jvmti->SetJNIFunctionTable(redir_jni_functions);
if (err != JVMTI_ERROR_NONE) {
result = STATUS_FAILED;
printf("(%s,%d): TEST FAILED: failed to get new JNI function table: %s\n",
__FILE__, __LINE__, TranslateError(err));
env->FatalError("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");
err = jvmti->SetJNIFunctionTable(orig_jni_functions);
if (err != JVMTI_ERROR_NONE) {
result = STATUS_FAILED;
printf("(%s,%d): TEST FAILED: failed to restore original JNI function table: %s\n",
__FILE__, __LINE__, TranslateError(err));
env->FatalError("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 = nullptr;
jvmtiError err;
jint res;
redir_calls = 0;
err = jvmti->GetJNIFunctionTable(&tested_jni_functions);
if (err != JVMTI_ERROR_NONE) {
result = STATUS_FAILED;
printf("(%s,%d): TEST FAILED: failed to get modified JNI function table: %s\n",
__FILE__, __LINE__, TranslateError(err));
env->FatalError("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(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 == nullptr) {
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 != nullptr && strcmp(options, "-verbose") == 0)
verbose = 1;
if (verbose)
printf("verbose mode on\n");
res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
if (res != JNI_OK || jvmti == nullptr) {
printf("(%s,%d): Failed to call GetEnv\n", __FILE__, __LINE__);
return JNI_ERR;
}
return JNI_OK;
}
}
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