1 /*
2 * Copyright (c) 1996, 2014, 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 // The existence or signature of this method is not guaranteed since it
76 // supports a private method. This method will be changed in 1.7.
77 JNIEXPORT jclass JNICALL
78 Java_java_lang_ClassLoader_defineClass0(JNIEnv *env,
79 jobject loader,
80 jstring name,
81 jbyteArray data,
82 jint offset,
83 jint length,
84 jobject pd)
85 {
86 return Java_java_lang_ClassLoader_defineClass1(env, loader, name, data, offset,
87 length, pd, NULL);
88 }
89
90 JNIEXPORT jclass JNICALL
91 Java_java_lang_ClassLoader_defineClass1(JNIEnv *env,
92 jobject loader,
93 jstring name,
94 jbyteArray data,
95 jint offset,
96 jint length,
97 jobject pd,
98 jstring source)
99 {
100 jbyte *body;
101 char *utfName;
102 jclass result = 0;
103 char buf[128];
104 char* utfSource;
105 char sourceBuf[1024];
106
107 if (data == NULL) {
108 JNU_ThrowNullPointerException(env, 0);
109 return 0;
110 }
111
112 /* Work around 4153825. malloc crashes on Solaris when passed a
113 * negative size.
114 */
115 if (length < 0) {
116 JNU_ThrowArrayIndexOutOfBoundsException(env, 0);
117 return 0;
118 }
119
120 body = (jbyte *)malloc(length);
121
122 if (body == 0) {
123 JNU_ThrowOutOfMemoryError(env, 0);
124 return 0;
125 }
126
127 (*env)->GetByteArrayRegion(env, data, offset, length, body);
128
129 if ((*env)->ExceptionOccurred(env))
130 goto free_body;
131
132 if (name != NULL) {
133 utfName = getUTF(env, name, buf, sizeof(buf));
134 if (utfName == NULL) {
135 goto free_body;
136 }
137 VerifyFixClassname(utfName);
138 } else {
139 utfName = NULL;
140 }
141
142 if (source != NULL) {
143 utfSource = getUTF(env, source, sourceBuf, sizeof(sourceBuf));
144 if (utfSource == NULL) {
145 goto free_utfName;
146 }
147 } else {
148 utfSource = NULL;
149 }
150 result = JVM_DefineClassWithSource(env, utfName, loader, body, length, pd, utfSource);
151
152 if (utfSource && utfSource != sourceBuf)
153 free(utfSource);
154
155 free_utfName:
156 if (utfName && utfName != buf)
157 free(utfName);
158
159 free_body:
160 free(body);
161 return result;
162 }
163
164 JNIEXPORT jclass JNICALL
165 Java_java_lang_ClassLoader_defineClass2(JNIEnv *env,
166 jobject loader,
167 jstring name,
168 jobject data,
169 jint offset,
170 jint length,
171 jobject pd,
172 jstring source)
173 {
174 jbyte *body;
175 char *utfName;
176 jclass result = 0;
177 char buf[128];
178 char* utfSource;
179 char sourceBuf[1024];
180
181 assert(data != NULL); // caller fails if data is null.
182 assert(length >= 0); // caller passes ByteBuffer.remaining() for length, so never neg.
183 // caller passes ByteBuffer.position() for offset, and capacity() >= position() + remaining()
184 assert((*env)->GetDirectBufferCapacity(env, data) >= (offset + length));
185
186 body = (*env)->GetDirectBufferAddress(env, data);
187
188 if (body == 0) {
189 JNU_ThrowNullPointerException(env, 0);
190 return 0;
191 }
192
193 body += offset;
194
195 if (name != NULL) {
196 utfName = getUTF(env, name, buf, sizeof(buf));
197 if (utfName == NULL) {
198 JNU_ThrowOutOfMemoryError(env, NULL);
199 return result;
200 }
201 VerifyFixClassname(utfName);
202 } else {
203 utfName = NULL;
204 }
205
206 if (source != NULL) {
207 utfSource = getUTF(env, source, sourceBuf, sizeof(sourceBuf));
208 if (utfSource == NULL) {
209 JNU_ThrowOutOfMemoryError(env, NULL);
210 goto free_utfName;
211 }
212 } else {
213 utfSource = NULL;
214 }
215 result = JVM_DefineClassWithSource(env, utfName, loader, body, length, pd, utfSource);
216
217 if (utfSource && utfSource != sourceBuf)
218 free(utfSource);
219
220 free_utfName:
221 if (utfName && utfName != buf)
222 free(utfName);
223
224 return result;
225 }
226
227 /*
228 * Returns NULL if class not found.
229 */
230 JNIEXPORT jclass JNICALL
231 Java_java_lang_ClassLoader_findBootstrapClass(JNIEnv *env, jobject loader,
232 jstring classname)
233 {
234 char *clname;
235 jclass cls = 0;
236 char buf[128];
237
238 if (classname == NULL) {
239 return 0;
240 }
241
242 clname = getUTF(env, classname, buf, sizeof(buf));
243 if (clname == NULL) {
244 JNU_ThrowOutOfMemoryError(env, NULL);
245 return NULL;
246 }
247 VerifyFixClassname(clname);
248
249 if (!VerifyClassname(clname, JNI_TRUE)) { /* expects slashed name */
250 goto done;
251 }
252
253 cls = JVM_FindClassFromBootLoader(env, clname);
254
255 done:
256 if (clname != buf) {
257 free(clname);
258 }
259
260 return cls;
261 }
262
263 JNIEXPORT jclass JNICALL
264 Java_java_lang_ClassLoader_findLoadedClass0(JNIEnv *env, jobject loader,
265 jstring name)
266 {
267 if (name == NULL) {
268 return 0;
269 } else {
270 return JVM_FindLoadedClass(env, loader, name);
271 }
272 }
273
274 static jfieldID handleID;
275 static jfieldID jniVersionID;
276 static jfieldID loadedID;
277 static void *procHandle;
278
279 static jboolean initIDs(JNIEnv *env)
280 {
281 if (handleID == 0) {
282 jclass this =
283 (*env)->FindClass(env, "java/lang/ClassLoader$NativeLibrary");
284 if (this == 0)
285 return JNI_FALSE;
286 handleID = (*env)->GetFieldID(env, this, "handle", "J");
287 if (handleID == 0)
288 return JNI_FALSE;
289 jniVersionID = (*env)->GetFieldID(env, this, "jniVersion", "I");
290 if (jniVersionID == 0)
291 return JNI_FALSE;
292 loadedID = (*env)->GetFieldID(env, this, "loaded", "Z");
293 if (loadedID == 0)
294 return JNI_FALSE;
295 procHandle = getProcessHandle();
296 }
297 return JNI_TRUE;
298 }
299
300 typedef jint (JNICALL *JNI_OnLoad_t)(JavaVM *, void *);
301 typedef void (JNICALL *JNI_OnUnload_t)(JavaVM *, void *);
302
303 /*
304 * Support for finding JNI_On(Un)Load_<lib_name> if it exists.
305 * If cname == NULL then just find normal JNI_On(Un)Load entry point
306 */
307 static void *findJniFunction(JNIEnv *env, void *handle,
308 const char *cname, jboolean isLoad) {
309 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS;
310 const char *onUnloadSymbols[] = JNI_ONUNLOAD_SYMBOLS;
311 const char **syms;
312 int symsLen;
313 void *entryName = NULL;
314 char *jniFunctionName;
315 int i;
316 size_t len;
317
318 // Check for JNI_On(Un)Load<_libname> function
319 if (isLoad) {
320 syms = onLoadSymbols;
321 symsLen = sizeof(onLoadSymbols) / sizeof(char *);
322 } else {
323 syms = onUnloadSymbols;
324 symsLen = sizeof(onUnloadSymbols) / sizeof(char *);
325 }
326 for (i = 0; i < symsLen; i++) {
327 // cname + sym + '_' + '\0'
328 if ((len = (cname != NULL ? strlen(cname) : 0) + strlen(syms[i]) + 2) >
329 FILENAME_MAX) {
330 goto done;
331 }
332 jniFunctionName = malloc(len);
333 if (jniFunctionName == NULL) {
334 JNU_ThrowOutOfMemoryError(env, NULL);
335 goto done;
336 }
337 buildJniFunctionName(syms[i], cname, jniFunctionName);
338 entryName = JVM_FindLibraryEntry(handle, jniFunctionName);
339 free(jniFunctionName);
340 if(entryName) {
341 break;
342 }
343 }
344
345 done:
346 return entryName;
347 }
348
349 /*
350 * Class: java_lang_ClassLoader_NativeLibrary
351 * Method: load
352 * Signature: (Ljava/lang/String;Z)V
353 */
354 JNIEXPORT void JNICALL
355 Java_java_lang_ClassLoader_00024NativeLibrary_load
356 (JNIEnv *env, jobject this, jstring name, jboolean isBuiltin)
357 {
358 const char *cname;
359 jint jniVersion;
360 jthrowable cause;
361 void * handle;
362
363 if (!initIDs(env))
364 return;
365
366 cname = JNU_GetStringPlatformChars(env, name, 0);
367 if (cname == 0)
368 return;
369 handle = isBuiltin ? procHandle : JVM_LoadLibrary(cname);
370 if (handle) {
371 JNI_OnLoad_t JNI_OnLoad;
372 JNI_OnLoad = (JNI_OnLoad_t)findJniFunction(env, handle,
373 isBuiltin ? cname : NULL,
374 JNI_TRUE);
375 if (JNI_OnLoad) {
376 JavaVM *jvm;
377 (*env)->GetJavaVM(env, &jvm);
378 jniVersion = (*JNI_OnLoad)(jvm, NULL);
379 } else {
380 jniVersion = 0x00010001;
381 }
382
383 cause = (*env)->ExceptionOccurred(env);
384 if (cause) {
385 (*env)->ExceptionClear(env);
386 (*env)->Throw(env, cause);
387 if (!isBuiltin) {
388 JVM_UnloadLibrary(handle);
389 }
390 goto done;
391 }
392
393 if (!JVM_IsSupportedJNIVersion(jniVersion) ||
394 (isBuiltin && jniVersion < JNI_VERSION_1_8)) {
395 char msg[256];
396 jio_snprintf(msg, sizeof(msg),
397 "unsupported JNI version 0x%08X required by %s",
398 jniVersion, cname);
399 JNU_ThrowByName(env, "java/lang/UnsatisfiedLinkError", msg);
400 if (!isBuiltin) {
401 JVM_UnloadLibrary(handle);
402 }
403 goto done;
404 }
405 (*env)->SetIntField(env, this, jniVersionID, jniVersion);
406 } else {
407 cause = (*env)->ExceptionOccurred(env);
408 if (cause) {
409 (*env)->ExceptionClear(env);
410 (*env)->SetLongField(env, this, handleID, (jlong)0);
411 (*env)->Throw(env, cause);
412 }
413 goto done;
414 }
415 (*env)->SetLongField(env, this, handleID, ptr_to_jlong(handle));
416 (*env)->SetBooleanField(env, this, loadedID, JNI_TRUE);
417
418 done:
419 JNU_ReleaseStringPlatformChars(env, name, cname);
420 }
421
422 /*
423 * Class: java_lang_ClassLoader_NativeLibrary
424 * Method: unload
425 * Signature: (Z)V
426 */
427 JNIEXPORT void JNICALL
428 Java_java_lang_ClassLoader_00024NativeLibrary_unload
429 (JNIEnv *env, jobject this, jstring name, jboolean isBuiltin)
430 {
431 const char *onUnloadSymbols[] = JNI_ONUNLOAD_SYMBOLS;
432 void *handle;
433 JNI_OnUnload_t JNI_OnUnload;
434 const char *cname;
435
436 if (!initIDs(env))
437 return;
438 cname = JNU_GetStringPlatformChars(env, name, 0);
439 if (cname == NULL) {
440 return;
441 }
442 handle = jlong_to_ptr((*env)->GetLongField(env, this, handleID));
443 JNI_OnUnload = (JNI_OnUnload_t )findJniFunction(env, handle,
444 isBuiltin ? cname : NULL,
445 JNI_FALSE);
446 if (JNI_OnUnload) {
447 JavaVM *jvm;
448 (*env)->GetJavaVM(env, &jvm);
449 (*JNI_OnUnload)(jvm, NULL);
450 }
451 if (!isBuiltin) {
452 JVM_UnloadLibrary(handle);
453 }
454 JNU_ReleaseStringPlatformChars(env, name, cname);
455 }
456
457 /*
458 * Class: java_lang_ClassLoader_NativeLibrary
459 * Method: find
460 * Signature: (Ljava/lang/String;)J
461 */
462 JNIEXPORT jlong JNICALL
463 Java_java_lang_ClassLoader_00024NativeLibrary_find
464 (JNIEnv *env, jobject this, jstring name)
465 {
466 jlong handle;
467 const char *cname;
468 jlong res;
469
470 if (!initIDs(env))
471 return jlong_zero;
472
473 handle = (*env)->GetLongField(env, this, handleID);
474 cname = (*env)->GetStringUTFChars(env, name, 0);
475 if (cname == 0)
476 return jlong_zero;
477 res = ptr_to_jlong(JVM_FindLibraryEntry(jlong_to_ptr(handle), cname));
478 (*env)->ReleaseStringUTFChars(env, name, cname);
479 return res;
480 }
481 /*
482 * Class: java_lang_ClassLoader_NativeLibrary
483 * Method: findBuiltinLib
484 * Signature: (Ljava/lang/String;)Ljava/lang/String;
485 */
486 JNIEXPORT jstring JNICALL
487 Java_java_lang_ClassLoader_00024NativeLibrary_findBuiltinLib
488 (JNIEnv *env, jclass cls, jstring name)
489 {
490 const char *cname;
491 char *libName;
492 size_t prefixLen = strlen(JNI_LIB_PREFIX);
493 size_t suffixLen = strlen(JNI_LIB_SUFFIX);
494 size_t len;
495 jstring lib;
496 void *ret;
497 const char *onLoadSymbols[] = JNI_ONLOAD_SYMBOLS;
498
499 if (name == NULL) {
500 JNU_ThrowInternalError(env, "NULL filename for native library");
501 return NULL;
502 }
503 // Can't call initIDs because it will recurse into NativeLibrary via
504 // FindClass to check context so set prochandle here as well.
505 procHandle = getProcessHandle();
506 cname = JNU_GetStringPlatformChars(env, name, 0);
507 if (cname == NULL) {
508 return NULL;
509 }
510 // Copy name Skipping PREFIX
511 len = strlen(cname);
512 if (len <= (prefixLen+suffixLen)) {
513 JNU_ReleaseStringPlatformChars(env, name, cname);
514 return NULL;
515 }
516 libName = malloc(len + 1); //+1 for null if prefix+suffix == 0
517 if (libName == NULL) {
518 JNU_ReleaseStringPlatformChars(env, name, cname);
519 JNU_ThrowOutOfMemoryError(env, NULL);
520 return NULL;
521 }
522 if (len > prefixLen) {
523 strcpy(libName, cname+prefixLen);
524 }
525 JNU_ReleaseStringPlatformChars(env, name, cname);
526
527 // Strip SUFFIX
528 libName[strlen(libName)-suffixLen] = '\0';
529
530 // Check for JNI_OnLoad_libname function
531 ret = findJniFunction(env, procHandle, libName, JNI_TRUE);
532 if (ret != NULL) {
533 lib = JNU_NewStringPlatform(env, libName);
534 free(libName);
535 return lib;
536 }
537 free(libName);
538 return NULL;
539 }