| /* |
| * Copyright (c) 1996, 2015, 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. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * 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 <stdlib.h> |
| #include <assert.h> |
| |
| #include "jni.h" |
| #include "jni_util.h" |
| #include "jlong.h" |
| #include "jvm.h" |
| #include "java_lang_ClassLoader.h" |
| #include "java_lang_ClassLoader_NativeLibrary.h" |
| #include <string.h> |
| |
| /* defined in libverify.so/verify.dll (src file common/check_format.c) */ |
| extern jboolean VerifyClassname(char *utf_name, jboolean arrayAllowed); |
| extern jboolean VerifyFixClassname(char *utf_name); |
| |
| static JNINativeMethod methods[] = { |
| {"retrieveDirectives", "()Ljava/lang/AssertionStatusDirectives;", (void *)&JVM_AssertionStatusDirectives} |
| }; |
| |
| JNIEXPORT void JNICALL |
| Java_java_lang_ClassLoader_registerNatives(JNIEnv *env, jclass cls) |
| { |
| (*env)->RegisterNatives(env, cls, methods, |
| sizeof(methods)/sizeof(JNINativeMethod)); |
| } |
| |
| /* Convert java string to UTF char*. Use local buffer if possible, |
| otherwise malloc new memory. Returns null IFF malloc failed. */ |
| static char* |
| getUTF(JNIEnv *env, jstring str, char* localBuf, int bufSize) |
| { |
| char* utfStr = NULL; |
| |
| int len = (*env)->GetStringUTFLength(env, str); |
| int unicode_len = (*env)->GetStringLength(env, str); |
| if (len >= bufSize) { |
| utfStr = malloc(len + 1); |
| if (utfStr == NULL) { |
| JNU_ThrowOutOfMemoryError(env, NULL); |
| return NULL; |
| } |
| } else { |
| utfStr = localBuf; |
| } |
| (*env)->GetStringUTFRegion(env, str, 0, unicode_len, utfStr); |
| |
| return utfStr; |
| } |
| |
| JNIEXPORT jclass JNICALL |
| Java_java_lang_ClassLoader_defineClass1(JNIEnv *env, |
| jclass cls, |
| jobject loader, |
| jstring name, |
| jbyteArray data, |
| jint offset, |
| jint length, |
| jobject pd, |
| jstring source) |
| { |
| jbyte *body; |
| char *utfName; |
| jclass result = 0; |
| char buf[128]; |
| char* utfSource; |
| char sourceBuf[1024]; |
| |
| if (data == NULL) { |
| JNU_ThrowNullPointerException(env, 0); |
| return 0; |
| } |
| |
| /* Work around 4153825. malloc crashes on Solaris when passed a |
| * negative size. |
| */ |
| if (length < 0) { |
| JNU_ThrowArrayIndexOutOfBoundsException(env, 0); |
| return 0; |
| } |
| |
| body = (jbyte *)malloc(length); |
| |
| if (body == 0) { |
| JNU_ThrowOutOfMemoryError(env, 0); |
| return 0; |
| } |
| |
| (*env)->GetByteArrayRegion(env, data, offset, length, body); |
| |
| if ((*env)->ExceptionOccurred(env)) |
| goto free_body; |
| |
| if (name != NULL) { |
| utfName = getUTF(env, name, buf, sizeof(buf)); |
| if (utfName == NULL) { |
| goto free_body; |
| } |
| VerifyFixClassname(utfName); |
| } else { |
| utfName = NULL; |
| } |
| |
| if (source != NULL) { |
| utfSource = getUTF(env, source, sourceBuf, sizeof(sourceBuf)); |
| if (utfSource == NULL) { |
| goto free_utfName; |
| } |
| } else { |
| utfSource = NULL; |
| } |
| result = JVM_DefineClassWithSource(env, utfName, loader, body, length, pd, utfSource); |
| |
| if (utfSource && utfSource != sourceBuf) |
| free(utfSource); |
| |
| free_utfName: |
| if (utfName && utfName != buf) |
| free(utfName); |
| |
| free_body: |
| free(body); |
| return result; |
| } |
| |
| JNIEXPORT jclass JNICALL |
| Java_java_lang_ClassLoader_defineClass2(JNIEnv *env, |
| jclass cls, |
| jobject loader, |
| jstring name, |
| jobject data, |
| jint offset, |
| jint length, |
| jobject pd, |
| jstring source) |
| { |
| jbyte *body; |
| char *utfName; |
| jclass result = 0; |
| char buf[128]; |
| char* utfSource; |
| char sourceBuf[1024]; |
| |
| assert(data != NULL); // caller fails if data is null. |
| assert(length >= 0); // caller passes ByteBuffer.remaining() for length, so never neg. |
| // caller passes ByteBuffer.position() for offset, and capacity() >= position() + remaining() |
| assert((*env)->GetDirectBufferCapacity(env, data) >= (offset + length)); |
| |
| body = (*env)->GetDirectBufferAddress(env, data); |
| |
| if (body == 0) { |
| JNU_ThrowNullPointerException(env, 0); |
| return 0; |
| } |
| |
| body += offset; |
| |
| if (name != NULL) { |
| utfName = getUTF(env, name, buf, sizeof(buf)); |
| if (utfName == NULL) { |
| JNU_ThrowOutOfMemoryError(env, NULL); |
| return result; |
| } |
| VerifyFixClassname(utfName); |
| } else { |
| utfName = NULL; |
| } |
| |
| if (source != NULL) { |
| utfSource = getUTF(env, source, sourceBuf, sizeof(sourceBuf)); |
| if (utfSource == NULL) { |
| JNU_ThrowOutOfMemoryError(env, NULL); |
| goto free_utfName; |
| } |
| } else { |
| utfSource = NULL; |
| } |
| result = JVM_DefineClassWithSource(env, utfName, loader, body, length, pd, utfSource); |
| |
| if (utfSource && utfSource != sourceBuf) |
| free(utfSource); |
| |
| free_utfName: |
| if (utfName && utfName != buf) |
| free(utfName); |
| |
| return result; |
| } |
| |
| /* |
| * Returns NULL if class not found. |
| */ |
| JNIEXPORT jclass JNICALL |
| Java_java_lang_ClassLoader_findBootstrapClass(JNIEnv *env, jobject loader, |
| jstring classname) |
| { |
| char *clname; |
| jclass cls = 0; |
| char buf[128]; |
| |
| if (classname == NULL) { |
| return 0; |
| } |
| |
| clname = getUTF(env, classname, buf, sizeof(buf)); |
| if (clname == NULL) { |
| JNU_ThrowOutOfMemoryError(env, NULL); |
| return NULL; |
| } |
| VerifyFixClassname(clname); |
| |
| if (!VerifyClassname(clname, JNI_TRUE)) { /* expects slashed name */ |
| goto done; |
| } |
| |
| cls = JVM_FindClassFromBootLoader(env, clname); |
| |
| done: |
| if (clname != buf) { |
| free(clname); |
| } |
| |
| return cls; |
| } |
| |
| JNIEXPORT jclass JNICALL |
| Java_java_lang_ClassLoader_findLoadedClass0(JNIEnv *env, jobject loader, |
| jstring name) |
| { |
| if (name == NULL) { |
| return 0; |
| } else { |
| return JVM_FindLoadedClass(env, loader, name); |
| } |
| } |
| |
| static jfieldID handleID; |
| static jfieldID jniVersionID; |
| static jfieldID loadedID; |
| static void *procHandle; |
| |
| static jboolean initIDs(JNIEnv *env) |
| { |
| if (handleID == 0) { |
| jclass this = |
| (*env)->FindClass(env, "java/lang/ClassLoader$NativeLibrary"); |
| if (this == 0) |
| return JNI_FALSE; |
| handleID = (*env)->GetFieldID(env, this, "handle", "J"); |
| if (handleID == 0) |
| return JNI_FALSE; |
| jniVersionID = (*env)->GetFieldID(env, this, "jniVersion", "I"); |
| if (jniVersionID == 0) |
| return JNI_FALSE; |
| loadedID = (*env)->GetFieldID(env, this, "loaded", "Z"); |
| if (loadedID == 0) |
| return JNI_FALSE; |
| procHandle = getProcessHandle(); |
| } |
| return JNI_TRUE; |
| } |
| |
| typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *); |
| typedef void (JNICALL *JNI_OnUnload_t)(JavaVM *, void *); |
| |
| /* |
| * Support for finding JNI_On(Un)Load_<lib_name> if it exists. |
| * If cname == NULL then just find normal JNI_On(Un)Load entry point |
| */ |
| static void *findJniFunction(JNIEnv *env, void *handle, |
| const char *cname, jboolean isLoad) { |
| const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; |
| const char *onUnloadSymbols[] = JNI_ONUNLOAD_SYMBOLS; |
| const char **syms; |
| int symsLen; |
| void *entryName = NULL; |
| char *jniFunctionName; |
| int i; |
| size_t len; |
| |
| // Check for JNI_On(Un)Load<_libname> function |
| if (isLoad) { |
| syms = onLoadSymbols; |
| symsLen = sizeof(onLoadSymbols) / sizeof(char *); |
| } else { |
| syms = onUnloadSymbols; |
| symsLen = sizeof(onUnloadSymbols) / sizeof(char *); |
| } |
| for (i = 0; i < symsLen; i++) { |
| // cname + sym + '_' + '\0' |
| if ((len = (cname != NULL ? strlen(cname) : 0) + strlen(syms[i]) + 2) > |
| FILENAME_MAX) { |
| goto done; |
| } |
| jniFunctionName = malloc(len); |
| if (jniFunctionName == NULL) { |
| JNU_ThrowOutOfMemoryError(env, NULL); |
| goto done; |
| } |
| buildJniFunctionName(syms[i], cname, jniFunctionName); |
| entryName = JVM_FindLibraryEntry(handle, jniFunctionName); |
| free(jniFunctionName); |
| if(entryName) { |
| break; |
| } |
| } |
| |
| done: |
| return entryName; |
| } |
| |
| /* |
| * Class: java_lang_ClassLoader_NativeLibrary |
| * Method: load |
| * Signature: (Ljava/lang/String;Z)V |
| */ |
| JNIEXPORT void JNICALL |
| Java_java_lang_ClassLoader_00024NativeLibrary_load |
| (JNIEnv *env, jobject this, jstring name, jboolean isBuiltin) |
| { |
| const char *cname; |
| jint jniVersion; |
| jthrowable cause; |
| void * handle; |
| |
| if (!initIDs(env)) |
| return; |
| |
| cname = JNU_GetStringPlatformChars(env, name, 0); |
| if (cname == 0) |
| return; |
| handle = isBuiltin ? procHandle : JVM_LoadLibrary(cname); |
| if (handle) { |
| JNI_OnLoad_t JNI_OnLoad; |
| JNI_OnLoad = (JNI_OnLoad_t)findJniFunction(env, handle, |
| isBuiltin ? cname : NULL, |
| JNI_TRUE); |
| if (JNI_OnLoad) { |
| JavaVM *jvm; |
| (*env)->GetJavaVM(env, &jvm); |
| jniVersion = (*JNI_OnLoad)(jvm, NULL); |
| } else { |
| jniVersion = 0x00010001; |
| } |
| |
| cause = (*env)->ExceptionOccurred(env); |
| if (cause) { |
| (*env)->ExceptionClear(env); |
| (*env)->Throw(env, cause); |
| if (!isBuiltin) { |
| JVM_UnloadLibrary(handle); |
| } |
| goto done; |
| } |
| |
| if (!JVM_IsSupportedJNIVersion(jniVersion) || |
| (isBuiltin && jniVersion < JNI_VERSION_1_8)) { |
| char msg[256]; |
| jio_snprintf(msg, sizeof(msg), |
| "unsupported JNI version 0x%08X required by %s", |
| jniVersion, cname); |
| JNU_ThrowByName(env, "java/lang/UnsatisfiedLinkError", msg); |
| if (!isBuiltin) { |
| JVM_UnloadLibrary(handle); |
| } |
| goto done; |
| } |
| (*env)->SetIntField(env, this, jniVersionID, jniVersion); |
| } else { |
| cause = (*env)->ExceptionOccurred(env); |
| if (cause) { |
| (*env)->ExceptionClear(env); |
| (*env)->SetLongField(env, this, handleID, (jlong)0); |
| (*env)->Throw(env, cause); |
| } |
| goto done; |
| } |
| (*env)->SetLongField(env, this, handleID, ptr_to_jlong(handle)); |
| (*env)->SetBooleanField(env, this, loadedID, JNI_TRUE); |
| |
| done: |
| JNU_ReleaseStringPlatformChars(env, name, cname); |
| } |
| |
| /* |
| * Class: java_lang_ClassLoader_NativeLibrary |
| * Method: unload |
| * Signature: (Z)V |
| */ |
| JNIEXPORT void JNICALL |
| Java_java_lang_ClassLoader_00024NativeLibrary_unload |
| (JNIEnv *env, jobject this, jstring name, jboolean isBuiltin) |
| { |
| const char *onUnloadSymbols[] = JNI_ONUNLOAD_SYMBOLS; |
| void *handle; |
| JNI_OnUnload_t JNI_OnUnload; |
| const char *cname; |
| |
| if (!initIDs(env)) |
| return; |
| cname = JNU_GetStringPlatformChars(env, name, 0); |
| if (cname == NULL) { |
| return; |
| } |
| handle = jlong_to_ptr((*env)->GetLongField(env, this, handleID)); |
| JNI_OnUnload = (JNI_OnUnload_t )findJniFunction(env, handle, |
| isBuiltin ? cname : NULL, |
| JNI_FALSE); |
| if (JNI_OnUnload) { |
| JavaVM *jvm; |
| (*env)->GetJavaVM(env, &jvm); |
| (*JNI_OnUnload)(jvm, NULL); |
| } |
| if (!isBuiltin) { |
| JVM_UnloadLibrary(handle); |
| } |
| JNU_ReleaseStringPlatformChars(env, name, cname); |
| } |
| |
| /* |
| * Class: java_lang_ClassLoader_NativeLibrary |
| * Method: find |
| * Signature: (Ljava/lang/String;)J |
| */ |
| JNIEXPORT jlong JNICALL |
| Java_java_lang_ClassLoader_00024NativeLibrary_find |
| (JNIEnv *env, jobject this, jstring name) |
| { |
| jlong handle; |
| const char *cname; |
| jlong res; |
| |
| if (!initIDs(env)) |
| return jlong_zero; |
| |
| handle = (*env)->GetLongField(env, this, handleID); |
| cname = (*env)->GetStringUTFChars(env, name, 0); |
| if (cname == 0) |
| return jlong_zero; |
| res = ptr_to_jlong(JVM_FindLibraryEntry(jlong_to_ptr(handle), cname)); |
| (*env)->ReleaseStringUTFChars(env, name, cname); |
| return res; |
| } |
| /* |
| * Class: java_lang_ClassLoader |
| * Method: findBuiltinLib |
| * Signature: (Ljava/lang/String;)Ljava/lang/String; |
| */ |
| JNIEXPORT jstring JNICALL |
| Java_java_lang_ClassLoader_findBuiltinLib |
| (JNIEnv *env, jclass cls, jstring name) |
| { |
| const char *cname; |
| char *libName; |
| size_t prefixLen = strlen(JNI_LIB_PREFIX); |
| size_t suffixLen = strlen(JNI_LIB_SUFFIX); |
| size_t len; |
| jstring lib; |
| void *ret; |
| const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS; |
| |
| if (name == NULL) { |
| JNU_ThrowInternalError(env, "NULL filename for native library"); |
| return NULL; |
| } |
| procHandle = getProcessHandle(); |
| cname = JNU_GetStringPlatformChars(env, name, 0); |
| if (cname == NULL) { |
| return NULL; |
| } |
| // Copy name Skipping PREFIX |
| len = strlen(cname); |
| if (len <= (prefixLen+suffixLen)) { |
| JNU_ReleaseStringPlatformChars(env, name, cname); |
| return NULL; |
| } |
| libName = malloc(len + 1); //+1 for null if prefix+suffix == 0 |
| if (libName == NULL) { |
| JNU_ReleaseStringPlatformChars(env, name, cname); |
| JNU_ThrowOutOfMemoryError(env, NULL); |
| return NULL; |
| } |
| if (len > prefixLen) { |
| strcpy(libName, cname+prefixLen); |
| } |
| JNU_ReleaseStringPlatformChars(env, name, cname); |
| |
| // Strip SUFFIX |
| libName[strlen(libName)-suffixLen] = '\0'; |
| |
| // Check for JNI_OnLoad_libname function |
| ret = findJniFunction(env, procHandle, libName, JNI_TRUE); |
| if (ret != NULL) { |
| lib = JNU_NewStringPlatform(env, libName); |
| free(libName); |
| return lib; |
| } |
| free(libName); |
| return NULL; |
| } |