1 /*
2 * Copyright (c) 1996, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 #include <stdlib.h>
27 #include <assert.h>
28
29 #include "jni.h"
30 #include "jni_util.h"
31 #include "jlong.h"
32 #include "jvm.h"
33 #include "java_lang_ClassLoader.h"
34 #include "java_lang_ClassLoader_NativeLibrary.h"
35 #include <string.h>
36
37 /* defined in libverify.so/verify.dll (src file common/check_format.c) */
38 extern jboolean VerifyClassname(char *utf_name, jboolean arrayAllowed);
39 extern jboolean VerifyFixClassname(char *utf_name);
40
41 static JNINativeMethod methods[] = {
42 {"retrieveDirectives", "()Ljava/lang/AssertionStatusDirectives;", (void *)&JVM_AssertionStatusDirectives}
43 };
44
45 JNIEXPORT void JNICALL
46 Java_java_lang_ClassLoader_registerNatives(JNIEnv *env, jclass cls)
47 {
48 (*env)->RegisterNatives(env, cls, methods,
49 sizeof(methods)/sizeof(JNINativeMethod));
50 }
51
52 /* Convert java string to UTF char*. Use local buffer if possible,
53 otherwise malloc new memory. Returns null IFF malloc failed. */
54 static char*
55 getUTF(JNIEnv *env, jstring str, char* localBuf, int bufSize)
56 {
57 char* utfStr = NULL;
58
59 int len = (*env)->GetStringUTFLength(env, str);
60 int unicode_len = (*env)->GetStringLength(env, str);
61 if (len >= bufSize) {
62 utfStr = malloc(len + 1);
63 if (utfStr == NULL) {
64 JNU_ThrowOutOfMemoryError(env, NULL);
65 return NULL;
66 }
67 } else {
68 utfStr = localBuf;
69 }
70 (*env)->GetStringUTFRegion(env, str, 0, unicode_len, utfStr);
71
72 return utfStr;
73 }
74
75 JNIEXPORT jclass JNICALL
76 Java_java_lang_ClassLoader_defineClass1(JNIEnv *env,
77 jclass cls,
78 jobject loader,
79 jstring name,
80 jbyteArray data,
81 jint offset,
82 jint length,
83 jobject pd,
84 jstring source)
85 {
86 jbyte *body;
87 char *utfName;
88 jclass result = 0;
89 char buf[128];
90 char* utfSource;
91 char sourceBuf[1024];
92
93 if (data == NULL) {
94 JNU_ThrowNullPointerException(env, 0);
95 return 0;
96 }
97
98 /* Work around 4153825. malloc crashes on Solaris when passed a
99 * negative size.
100 */
101 if (length < 0) {
102 JNU_ThrowArrayIndexOutOfBoundsException(env, 0);
103 return 0;
104 }
105
106 body = (jbyte *)malloc(length);
107
108 if (body == 0) {
109 JNU_ThrowOutOfMemoryError(env, 0);
110 return 0;
111 }
112
113 (*env)->GetByteArrayRegion(env, data, offset, length, body);
114
115 if ((*env)->ExceptionOccurred(env))
116 goto free_body;
117
118 if (name != NULL) {
119 utfName = getUTF(env, name, buf, sizeof(buf));
120 if (utfName == NULL) {
121 goto free_body;
122 }
123 VerifyFixClassname(utfName);
124 } else {
125 utfName = NULL;
126 }
127
128 if (source != NULL) {
129 utfSource = getUTF(env, source, sourceBuf, sizeof(sourceBuf));
130 if (utfSource == NULL) {
131 goto free_utfName;
132 }
133 } else {
134 utfSource = NULL;
135 }
136 result = JVM_DefineClassWithSource(env, utfName, loader, body, length, pd, utfSource);
137
138 if (utfSource && utfSource != sourceBuf)
139 free(utfSource);
140
141 free_utfName:
142 if (utfName && utfName != buf)
143 free(utfName);
144
145 free_body:
146 free(body);
147 return result;
148 }
149
150 JNIEXPORT jclass JNICALL
151 Java_java_lang_ClassLoader_defineClass2(JNIEnv *env,
152 jclass cls,
153 jobject loader,
154 jstring name,
155 jobject data,
156 jint offset,
157 jint length,
158 jobject pd,
159 jstring source)
160 {
161 jbyte *body;
162 char *utfName;
163 jclass result = 0;
164 char buf[128];
165 char* utfSource;
166 char sourceBuf[1024];
167
168 assert(data != NULL); // caller fails if data is null.
169 assert(length >= 0); // caller passes ByteBuffer.remaining() for length, so never neg.
170 // caller passes ByteBuffer.position() for offset, and capacity() >= position() + remaining()
171 assert((*env)->GetDirectBufferCapacity(env, data) >= (offset + length));
172
173 body = (*env)->GetDirectBufferAddress(env, data);
174
175 if (body == 0) {
176 JNU_ThrowNullPointerException(env, 0);
177 return 0;
178 }
179
180 body += offset;
181
182 if (name != NULL) {
183 utfName = getUTF(env, name, buf, sizeof(buf));
184 if (utfName == NULL) {
185 JNU_ThrowOutOfMemoryError(env, NULL);
186 return result;
187 }
188 VerifyFixClassname(utfName);
189 } else {
190 utfName = NULL;
191 }
192
193 if (source != NULL) {
194 utfSource = getUTF(env, source, sourceBuf, sizeof(sourceBuf));
195 if (utfSource == NULL) {
196 JNU_ThrowOutOfMemoryError(env, NULL);
197 goto free_utfName;
198 }
199 } else {
200 utfSource = NULL;
201 }
202 result = JVM_DefineClassWithSource(env, utfName, loader, body, length, pd, utfSource);
203
204 if (utfSource && utfSource != sourceBuf)
205 free(utfSource);
206
207 free_utfName:
208 if (utfName && utfName != buf)
209 free(utfName);
210
211 return result;
212 }
213
214 /*
215 * Returns NULL if class not found.
216 */
217 JNIEXPORT jclass JNICALL
218 Java_java_lang_ClassLoader_findBootstrapClass(JNIEnv *env, jobject loader,
219 jstring classname)
220 {
221 char *clname;
222 jclass cls = 0;
223 char buf[128];
224
225 if (classname == NULL) {
226 return 0;
227 }
228
229 clname = getUTF(env, classname, buf, sizeof(buf));
230 if (clname == NULL) {
231 JNU_ThrowOutOfMemoryError(env, NULL);
232 return NULL;
233 }
234 VerifyFixClassname(clname);
235
236 if (!VerifyClassname(clname, JNI_TRUE)) { /* expects slashed name */
237 goto done;
238 }
239
240 cls = JVM_FindClassFromBootLoader(env, clname);
241
242 done:
243 if (clname != buf) {
244 free(clname);
245 }
246
247 return cls;
248 }
249
250 JNIEXPORT jclass JNICALL
251 Java_java_lang_ClassLoader_findLoadedClass0(JNIEnv *env, jobject loader,
252 jstring name)
253 {
254 if (name == NULL) {
255 return 0;
256 } else {
257 return JVM_FindLoadedClass(env, loader, name);
258 }
259 }
260
261 static jfieldID handleID;
262 static jfieldID jniVersionID;
263 static void *procHandle;
264
265 static jboolean initIDs(JNIEnv *env)
266 {
267 if (handleID == 0) {
268 jclass this =
269 (*env)->FindClass(env, "java/lang/ClassLoader$NativeLibrary");
270 if (this == 0)
271 return JNI_FALSE;
272 handleID = (*env)->GetFieldID(env, this, "handle", "J");
273 if (handleID == 0)
274 return JNI_FALSE;
275 jniVersionID = (*env)->GetFieldID(env, this, "jniVersion", "I");
276 if (jniVersionID == 0)
277 return JNI_FALSE;
278 procHandle = getProcessHandle();
279 }
280 return JNI_TRUE;
281 }
282
283 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *);
284 typedef void (JNICALL *JNI_OnUnload_t)(JavaVM *, void *);
285
286 /*
287 * Support for finding JNI_On(Un)Load_<lib_name> if it exists.
288 * If cname == NULL then just find normal JNI_On(Un)Load entry point
289 */
290 static void *findJniFunction(JNIEnv *env, void *handle,
291 const char *cname, jboolean isLoad) {
292 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS;
293 const char *onUnloadSymbols[] = JNI_ONUNLOAD_SYMBOLS;
294 const char **syms;
295 int symsLen;
296 void *entryName = NULL;
297 char *jniFunctionName;
298 int i;
299 size_t len;
300
301 // Check for JNI_On(Un)Load<_libname> function
302 if (isLoad) {
303 syms = onLoadSymbols;
304 symsLen = sizeof(onLoadSymbols) / sizeof(char *);
305 } else {
306 syms = onUnloadSymbols;
307 symsLen = sizeof(onUnloadSymbols) / sizeof(char *);
308 }
309 for (i = 0; i < symsLen; i++) {
310 // cname + sym + '_' + '\0'
311 if ((len = (cname != NULL ? strlen(cname) : 0) + strlen(syms[i]) + 2) >
312 FILENAME_MAX) {
313 goto done;
314 }
315 jniFunctionName = malloc(len);
316 if (jniFunctionName == NULL) {
317 JNU_ThrowOutOfMemoryError(env, NULL);
318 goto done;
319 }
320 buildJniFunctionName(syms[i], cname, jniFunctionName);
321 entryName = JVM_FindLibraryEntry(handle, jniFunctionName);
322 free(jniFunctionName);
323 if(entryName) {
324 break;
325 }
326 }
327
328 done:
329 return entryName;
330 }
331
332 /*
333 * Class: java_lang_ClassLoader_NativeLibrary
334 * Method: load0
335 * Signature: (Ljava/lang/String;Z)Z
336 */
337 JNIEXPORT jboolean JNICALL
338 Java_java_lang_ClassLoader_00024NativeLibrary_load0
339 (JNIEnv *env, jobject this, jstring name, jboolean isBuiltin)
340 {
341 const char *cname;
342 jint jniVersion;
343 jthrowable cause;
344 void * handle;
345 jboolean loaded = JNI_FALSE;
346
347 if (!initIDs(env))
348 return JNI_FALSE;
349
350 cname = JNU_GetStringPlatformChars(env, name, 0);
351 if (cname == 0)
352 return JNI_FALSE;
353 handle = isBuiltin ? procHandle : JVM_LoadLibrary(cname);
354 if (handle) {
355 JNI_OnLoad_t JNI_OnLoad;
356 JNI_OnLoad = (JNI_OnLoad_t)findJniFunction(env, handle,
357 isBuiltin ? cname : NULL,
358 JNI_TRUE);
359 if (JNI_OnLoad) {
360 JavaVM *jvm;
361 (*env)->GetJavaVM(env, &jvm);
362 jniVersion = (*JNI_OnLoad)(jvm, NULL);
363 } else {
364 jniVersion = 0x00010001;
365 }
366
367 cause = (*env)->ExceptionOccurred(env);
368 if (cause) {
369 (*env)->ExceptionClear(env);
370 (*env)->Throw(env, cause);
371 if (!isBuiltin) {
372 JVM_UnloadLibrary(handle);
373 }
374 goto done;
375 }
376
377 if (!JVM_IsSupportedJNIVersion(jniVersion) ||
378 (isBuiltin && jniVersion < JNI_VERSION_1_8)) {
379 char msg[256];
380 jio_snprintf(msg, sizeof(msg),
381 "unsupported JNI version 0x%08X required by %s",
382 jniVersion, cname);
383 JNU_ThrowByName(env, "java/lang/UnsatisfiedLinkError", msg);
384 if (!isBuiltin) {
385 JVM_UnloadLibrary(handle);
386 }
387 goto done;
388 }
389 (*env)->SetIntField(env, this, jniVersionID, jniVersion);
390 } else {
391 cause = (*env)->ExceptionOccurred(env);
392 if (cause) {
393 (*env)->ExceptionClear(env);
394 (*env)->SetLongField(env, this, handleID, (jlong)0);
395 (*env)->Throw(env, cause);
396 }
397 goto done;
398 }
399 (*env)->SetLongField(env, this, handleID, ptr_to_jlong(handle));
400 loaded = JNI_TRUE;
401
402 done:
403 JNU_ReleaseStringPlatformChars(env, name, cname);
404 return loaded;
405 }
406
407 /*
408 * Class: java_lang_ClassLoader_NativeLibrary
409 * Method: unload
410 * Signature: (Ljava/lang/String;ZJ)V
411 */
412 JNIEXPORT void JNICALL
413 Java_java_lang_ClassLoader_00024NativeLibrary_unload
414 (JNIEnv *env, jclass cls, jstring name, jboolean isBuiltin, jlong address)
415 {
416 const char *onUnloadSymbols[] = JNI_ONUNLOAD_SYMBOLS;
417 void *handle;
418 JNI_OnUnload_t JNI_OnUnload;
419 const char *cname;
420
421 if (!initIDs(env))
422 return;
423 cname = JNU_GetStringPlatformChars(env, name, 0);
424 if (cname == NULL) {
425 return;
426 }
427 handle = jlong_to_ptr(address);
428 JNI_OnUnload = (JNI_OnUnload_t )findJniFunction(env, handle,
429 isBuiltin ? cname : NULL,
430 JNI_FALSE);
431 if (JNI_OnUnload) {
432 JavaVM *jvm;
433 (*env)->GetJavaVM(env, &jvm);
434 (*JNI_OnUnload)(jvm, NULL);
435 }
436 if (!isBuiltin) {
437 JVM_UnloadLibrary(handle);
438 }
439 JNU_ReleaseStringPlatformChars(env, name, cname);
440 }
441
442 /*
443 * Class: java_lang_ClassLoader_NativeLibrary
444 * Method: findEntry
445 * Signature: (Ljava/lang/String;)J
446 */
447 JNIEXPORT jlong JNICALL
448 Java_java_lang_ClassLoader_00024NativeLibrary_findEntry
449 (JNIEnv *env, jobject this, jstring name)
450 {
451 jlong handle;
452 const char *cname;
453 jlong res;
454
455 if (!initIDs(env))
456 return jlong_zero;
457
458 handle = (*env)->GetLongField(env, this, handleID);
459 cname = (*env)->GetStringUTFChars(env, name, 0);
460 if (cname == 0)
461 return jlong_zero;
462 res = ptr_to_jlong(JVM_FindLibraryEntry(jlong_to_ptr(handle), cname));
463 (*env)->ReleaseStringUTFChars(env, name, cname);
464 return res;
465 }
466 /*
467 * Class: java_lang_ClassLoader
468 * Method: findBuiltinLib
469 * Signature: (Ljava/lang/String;)Ljava/lang/String;
470 */
471 JNIEXPORT jstring JNICALL
472 Java_java_lang_ClassLoader_findBuiltinLib
473 (JNIEnv *env, jclass cls, jstring name)
474 {
475 const char *cname;
476 char *libName;
477 size_t prefixLen = strlen(JNI_LIB_PREFIX);
478 size_t suffixLen = strlen(JNI_LIB_SUFFIX);
479 size_t len;
480 jstring lib;
481 void *ret;
482 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS;
483
484 if (name == NULL) {
485 JNU_ThrowInternalError(env, "NULL filename for native library");
486 return NULL;
487 }
488 procHandle = getProcessHandle();
489 cname = JNU_GetStringPlatformChars(env, name, 0);
490 if (cname == NULL) {
491 return NULL;
492 }
493 // Copy name Skipping PREFIX
494 len = strlen(cname);
495 if (len <= (prefixLen+suffixLen)) {
496 JNU_ReleaseStringPlatformChars(env, name, cname);
497 return NULL;
498 }
499 libName = malloc(len + 1); //+1 for null if prefix+suffix == 0
500 if (libName == NULL) {
501 JNU_ReleaseStringPlatformChars(env, name, cname);
502 JNU_ThrowOutOfMemoryError(env, NULL);
503 return NULL;
504 }
505 if (len > prefixLen) {
506 strcpy(libName, cname+prefixLen);
507 }
508 JNU_ReleaseStringPlatformChars(env, name, cname);
509
510 // Strip SUFFIX
511 libName[strlen(libName)-suffixLen] = '\0';
512
513 // Check for JNI_OnLoad_libname function
514 ret = findJniFunction(env, procHandle, libName, JNI_TRUE);
515 if (ret != NULL) {
516 lib = JNU_NewStringPlatform(env, libName);
517 free(libName);
518 return lib;
519 }
520 free(libName);
521 return NULL;
522 }