1 /*
2 * Copyright (c) 1997, 2016, 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 <errno.h>
28 #include <string.h>
29 #include <sys/types.h>
30 #include <sys/socket.h>
31 #include <sys/time.h>
32 #include "jvm.h"
33 #include "jni_util.h"
34 #include "net_util.h"
35
36 #include "java_net_SocketInputStream.h"
37
38 /************************************************************************
39 * SocketInputStream
40 */
41
42 static jfieldID IO_fd_fdID;
43
44 /*
45 * Class: java_net_SocketInputStream
46 * Method: init
47 * Signature: ()V
48 */
49 JNIEXPORT void JNICALL
50 Java_java_net_SocketInputStream_init(JNIEnv *env, jclass cls) {
51 IO_fd_fdID = NET_GetFileDescriptorID(env);
52 }
53
54 static int NET_ReadWithTimeout(JNIEnv *env, int fd, char *bufP, int len, long timeout) {
55 int result = 0;
56 long prevtime = NET_GetCurrentTime(), newtime;
57 while (timeout > 0) {
58 result = NET_TimeoutWithCurrentTime(fd, timeout, prevtime);
59 if (result <= 0) {
60 if (result == 0) {
61 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketTimeoutException", "Read timed out");
62 } else if (result == -1) {
63 if (errno == EBADF) {
64 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Socket closed");
65 } else if (errno == ENOMEM) {
66 JNU_ThrowOutOfMemoryError(env, "NET_Timeout native heap allocation failed");
67 } else {
68 JNU_ThrowByNameWithMessageAndLastError
69 (env, JNU_JAVANETPKG "SocketException", "select/poll failed");
70 }
71 }
72 return -1;
73 }
74 result = NET_NonBlockingRead(fd, bufP, len);
75 if (result == -1 && ((errno == EAGAIN) || (errno == EWOULDBLOCK))) {
76 newtime = NET_GetCurrentTime();
77 timeout -= newtime - prevtime;
78 if (timeout > 0) {
79 prevtime = newtime;
80 }
81 } else {
82 break;
83 }
84 }
85 return result;
86 }
87
88 /*
89 * Class: java_net_SocketInputStream
90 * Method: socketRead0
91 * Signature: (Ljava/io/FileDescriptor;[BIII)I
92 */
93 JNIEXPORT jint JNICALL
94 Java_java_net_SocketInputStream_socketRead0(JNIEnv *env, jobject this,
95 jobject fdObj, jbyteArray data,
96 jint off, jint len, jint timeout)
97 {
98 char BUF[MAX_BUFFER_LEN];
99 char *bufP;
100 jint fd, nread;
101
102 if (IS_NULL(fdObj)) {
103 /* shouldn't this be a NullPointerException? -br */
104 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
105 "Socket closed");
106 return -1;
107 } else {
108 fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
109 /* Bug 4086704 - If the Socket associated with this file descriptor
110 * was closed (sysCloseFD), then the file descriptor is set to -1.
111 */
112 if (fd == -1) {
113 JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
114 return -1;
115 }
116 }
117
118 /*
119 * If the read is greater than our stack allocated buffer then
120 * we allocate from the heap (up to a limit)
121 */
122 if (len > MAX_BUFFER_LEN) {
123 if (len > MAX_HEAP_BUFFER_LEN) {
124 len = MAX_HEAP_BUFFER_LEN;
125 }
126 bufP = (char *)malloc((size_t)len);
127 if (bufP == NULL) {
128 bufP = BUF;
129 len = MAX_BUFFER_LEN;
130 }
131 } else {
132 bufP = BUF;
133 }
134 if (timeout) {
135 nread = NET_ReadWithTimeout(env, fd, bufP, len, timeout);
136 if ((*env)->ExceptionCheck(env)) {
137 if (bufP != BUF) {
138 free(bufP);
139 }
140 return nread;
141 }
142 } else {
143 nread = NET_Read(fd, bufP, len);
144 }
145
146 if (nread <= 0) {
147 if (nread < 0) {
148
149 switch (errno) {
150 case ECONNRESET:
151 case EPIPE:
152 JNU_ThrowByName(env, "sun/net/ConnectionResetException",
153 "Connection reset");
154 break;
155
156 case EBADF:
157 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
158 "Socket closed");
159 break;
160
161 case EINTR:
162 JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",
163 "Operation interrupted");
164 break;
165 default:
166 JNU_ThrowByNameWithMessageAndLastError
167 (env, JNU_JAVANETPKG "SocketException", "Read failed");
168 }
169 }
170 } else {
171 (*env)->SetByteArrayRegion(env, data, off, nread, (jbyte *)bufP);
172 }
173
174 if (bufP != BUF) {
175 free(bufP);
176 }
177 return nread;
178 }