1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/*
* 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 <string.h>
#include "jvmti.h"
#include "agent_common.hpp"
#include "JVMTITools.hpp"
extern "C" {
#define PASSED 0
#define STATUS_FAILED 2
static jvmtiEnv *jvmti = nullptr;
static jvmtiCapabilities caps;
static jint result = PASSED;
static jboolean printdump = JNI_FALSE;
#ifdef STATIC_BUILD
JNIEXPORT jint JNICALL Agent_OnLoad_redefclass025(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNICALL Agent_OnAttach_redefclass025(JavaVM *jvm, char *options, void *reserved) {
return Agent_Initialize(jvm, options, reserved);
}
JNIEXPORT jint JNI_OnLoad_redefclass025(JavaVM *jvm, char *options, void *reserved) {
return JNI_VERSION_1_8;
}
#endif
jint Agent_Initialize(JavaVM *jvm, char *options, void *reserved) {
jint res;
jvmtiError err;
if (options != nullptr && strcmp(options, "printdump") == 0) {
printdump = JNI_TRUE;
}
res = jvm->GetEnv((void **) &jvmti, JVMTI_VERSION_1_1);
if (res != JNI_OK || jvmti == nullptr) {
printf("Wrong result of a valid call to GetEnv!\n");
return JNI_ERR;
}
err = jvmti->GetPotentialCapabilities(&caps);
if (err != JVMTI_ERROR_NONE) {
printf("(GetPotentialCapabilities) unexpected error: %s (%d)\n",
TranslateError(err), err);
return JNI_ERR;
}
err = jvmti->AddCapabilities(&caps);
if (err != JVMTI_ERROR_NONE) {
printf("(AddCapabilities) unexpected error: %s (%d)\n",
TranslateError(err), err);
return JNI_ERR;
}
err = jvmti->GetCapabilities(&caps);
if (err != JVMTI_ERROR_NONE) {
printf("(GetCapabilities) unexpected error: %s (%d)\n",
TranslateError(err), err);
return JNI_ERR;
}
if (!caps.can_redefine_classes) {
printf("Warning: RedefineClasses is not implemented\n");
}
return JNI_OK;
}
JNIEXPORT jint JNICALL
Java_nsk_jvmti_RedefineClasses_redefclass025_check(JNIEnv *env, jclass cls,
jclass clazz, jbyteArray bytes) {
jvmtiError err;
jvmtiClassDefinition classDef;
if (jvmti == nullptr) {
printf("JVMTI client was not properly loaded!\n");
return STATUS_FAILED;
}
classDef.klass = clazz;
classDef.class_byte_count = env->GetArrayLength(bytes);
classDef.class_bytes = (unsigned char *) env->GetByteArrayElements(bytes, nullptr);
if (printdump == JNI_TRUE) {
printf(">>> change method modifiers capability check ...\n");
}
err = jvmti->RedefineClasses(1, &classDef);
if (err == JVMTI_ERROR_MUST_POSSESS_CAPABILITY &&
!caps.can_redefine_classes) {
/* It is OK */
} else
if (err != JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_MODIFIERS_CHANGED) {
printf("Warning: RedefineClasses is restricted\n");
printf("Error expected: ");
printf("JVMTI_ERROR_UNSUPPORTED_REDEFINITION_METHOD_MODIFIERS_CHANGED,\n");
printf("\tactual: %s (%d)\n", TranslateError(err), err);
result = STATUS_FAILED;
}
if (printdump == JNI_TRUE) {
printf(">>> ... done\n");
}
return result;
}
}
|
