1 /*
2 * Copyright (c) 2001, 2021, 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 #include "jni.h"
26 #include "jni_util.h"
27 #include "jvm.h"
28 #include "io_util.h"
29 #include "io_util_md.h"
30 #include <string.h>
31 #include <unistd.h>
32
33 #if defined(__linux__) || defined(_ALLBSD_SOURCE) || defined(_AIX)
34 #include <sys/ioctl.h>
35 #endif
36
37 #if defined(__linux__)
38 #include <linux/fs.h>
39 #include <sys/stat.h>
40 #endif
41
42 // BEGIN Android-added: Fuchsia: Alias *64 functions on Fuchsia. http://b/119496969
43 #if defined(__Fuchsia__)
44 #define stat64 stat
45 #define fstat64 fstat
46 #define open64 open
47 #endif
48 // END Android-added: Fuchsia: Alias *64 functions on Fuchsia. http://b/119496969
49
50 #ifdef MACOSX
51
52 #include <CoreFoundation/CoreFoundation.h>
53
54 __private_extern__
newStringPlatform(JNIEnv * env,const char * str)55 jstring newStringPlatform(JNIEnv *env, const char* str)
56 {
57 jstring rv = NULL;
58 CFMutableStringRef csref = CFStringCreateMutable(NULL, 0);
59 if (csref == NULL) {
60 JNU_ThrowOutOfMemoryError(env, "native heap");
61 } else {
62 CFStringAppendCString(csref, str, kCFStringEncodingUTF8);
63 CFStringNormalize(csref, kCFStringNormalizationFormC);
64 int clen = CFStringGetLength(csref);
65 int ulen = (clen + 1) * 2; // utf16 + zero padding
66 char* chars = malloc(ulen);
67 if (chars == NULL) {
68 CFRelease(csref);
69 JNU_ThrowOutOfMemoryError(env, "native heap");
70 } else {
71 if (CFStringGetCString(csref, chars, ulen, kCFStringEncodingUTF16)) {
72 rv = (*env)->NewString(env, (jchar*)chars, clen);
73 }
74 free(chars);
75 CFRelease(csref);
76 }
77 }
78 return rv;
79 }
80 #endif
81
82 FD
handleOpen(const char * path,int oflag,int mode)83 handleOpen(const char *path, int oflag, int mode) {
84 FD fd;
85 RESTARTABLE(open64(path, oflag, mode), fd);
86 if (fd != -1) {
87 struct stat64 buf64;
88 int result;
89 RESTARTABLE(fstat64(fd, &buf64), result);
90 if (result != -1) {
91 if (S_ISDIR(buf64.st_mode)) {
92 close(fd);
93 errno = EISDIR;
94 fd = -1;
95 }
96 } else {
97 close(fd);
98 fd = -1;
99 }
100 }
101 return fd;
102 }
103
getFD(JNIEnv * env,jobject obj,jfieldID fid)104 FD getFD(JNIEnv *env, jobject obj, jfieldID fid) {
105 jobject fdo = (*env)->GetObjectField(env, obj, fid);
106 if (fdo == NULL) {
107 return -1;
108 }
109 return (*env)->GetIntField(env, fdo, IO_fd_fdID);
110 }
111
112 // BEGIN Android-removed: Open files using IoBridge to share BlockGuard & StrictMode logic.
113 // http://b/112107427
114 /*
115 void
116 fileOpen(JNIEnv *env, jobject this, jstring path, jfieldID fid, int flags)
117 {
118 WITH_PLATFORM_STRING(env, path, ps) {
119 FD fd;
120
121 #if defined(__linux__) || defined(_ALLBSD_SOURCE)
122 * Remove trailing slashes, since the kernel won't *
123 char *p = (char *)ps + strlen(ps) - 1;
124 while ((p > ps) && (*p == '/'))
125 *p-- = '\0';
126 #endif
127 fd = handleOpen(ps, flags, 0666);
128 if (fd != -1) {
129 jobject fdobj;
130 jboolean append;
131 fdobj = (*env)->GetObjectField(env, this, fid);
132 if (fdobj != NULL) {
133 // Set FD
134 (*env)->SetIntField(env, fdobj, IO_fd_fdID, fd);
135 append = (flags & O_APPEND) == 0 ? JNI_FALSE : JNI_TRUE;
136 (*env)->SetBooleanField(env, fdobj, IO_append_fdID, append);
137 }
138 } else {
139 throwFileNotFoundException(env, path);
140 }
141 } END_PLATFORM_STRING(env, ps);
142 }
143 */
144 // END Android-removed: Open files using IoBridge to share BlockGuard & StrictMode logic.
145
146 // Function to close the fd held by this FileDescriptor and set fd to -1.
147 void
fileDescriptorClose(JNIEnv * env,jobject this)148 fileDescriptorClose(JNIEnv *env, jobject this)
149 {
150 FD fd = (*env)->GetIntField(env, this, IO_fd_fdID);
151 if ((*env)->ExceptionOccurred(env)) {
152 return;
153 }
154
155 if (fd == -1) {
156 return; // already closed and set to -1
157 }
158
159 /* Set the fd to -1 before closing it so that the timing window
160 * of other threads using the wrong fd (closed but recycled fd,
161 * that gets re-opened with some other filename) is reduced.
162 * Practically the chance of its occurance is low, however, we are
163 * taking extra precaution over here.
164 */
165 (*env)->SetIntField(env, this, IO_fd_fdID, -1);
166 if ((*env)->ExceptionOccurred(env)) {
167 return;
168 }
169 /*
170 * Don't close file descriptors 0, 1, or 2. If we close these stream
171 * then a subsequent file open or socket will use them. Instead we
172 * just redirect these file descriptors to /dev/null.
173 */
174 if (fd >= STDIN_FILENO && fd <= STDERR_FILENO) {
175 int devnull = open("/dev/null", O_WRONLY);
176 if (devnull < 0) {
177 (*env)->SetIntField(env, this, IO_fd_fdID, fd);
178 JNU_ThrowIOExceptionWithLastError(env, "open /dev/null failed");
179 } else {
180 dup2(devnull, fd);
181 close(devnull);
182 }
183 } else {
184 int result;
185 #if defined(_AIX)
186 /* AIX allows close to be restarted after EINTR */
187 RESTARTABLE(close(fd), result);
188 #else
189 result = close(fd);
190 #endif
191 if (result == -1 && errno != EINTR) {
192 JNU_ThrowIOExceptionWithLastError(env, "close failed");
193 }
194 }
195 }
196
197 ssize_t
handleRead(FD fd,void * buf,jint len)198 handleRead(FD fd, void *buf, jint len)
199 {
200 ssize_t result;
201 RESTARTABLE(read(fd, buf, len), result);
202 return result;
203 }
204
205 ssize_t
handleWrite(FD fd,const void * buf,jint len)206 handleWrite(FD fd, const void *buf, jint len)
207 {
208 ssize_t result;
209 RESTARTABLE(write(fd, buf, len), result);
210 return result;
211 }
212
213 jint
handleAvailable(FD fd,jlong * pbytes)214 handleAvailable(FD fd, jlong *pbytes)
215 {
216 int mode;
217 struct stat64 buf64;
218 jlong size = -1, current = -1;
219
220 int result;
221 RESTARTABLE(fstat64(fd, &buf64), result);
222 if (result != -1) {
223 mode = buf64.st_mode;
224 if (S_ISCHR(mode) || S_ISFIFO(mode) || S_ISSOCK(mode)) {
225 int n;
226 int result;
227 RESTARTABLE(ioctl(fd, FIONREAD, &n), result);
228 if (result >= 0) {
229 *pbytes = n;
230 return 1;
231 }
232 } else if (S_ISREG(mode)) {
233 size = buf64.st_size;
234 }
235 }
236
237 if ((current = lseek64(fd, 0, SEEK_CUR)) == -1) {
238 return 0;
239 }
240
241 if (size < current) {
242 if ((size = lseek64(fd, 0, SEEK_END)) == -1)
243 return 0;
244 else if (lseek64(fd, current, SEEK_SET) == -1)
245 return 0;
246 }
247
248 *pbytes = size - current;
249 return 1;
250 }
251
252 jint
handleSetLength(FD fd,jlong length)253 handleSetLength(FD fd, jlong length)
254 {
255 int result;
256 RESTARTABLE(ftruncate64(fd, length), result);
257 return result;
258 }
259
260 jlong
handleGetLength(FD fd)261 handleGetLength(FD fd)
262 {
263 struct stat64 sb;
264 int result;
265 RESTARTABLE(fstat64(fd, &sb), result);
266 if (result < 0) {
267 return -1;
268 }
269 #if defined(__linux__) && defined(BLKGETSIZE64)
270 if (S_ISBLK(sb.st_mode)) {
271 uint64_t size;
272 if(ioctl(fd, BLKGETSIZE64, &size) < 0) {
273 return -1;
274 }
275 return (jlong)size;
276 }
277 #endif
278 return sb.st_size;
279 }
280