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 /*
55 * Class: java_net_SocketInputStream
56 * Method: socketRead0
57 * Signature: (Ljava/io/FileDescriptor;[BIII)I
58 */
59 JNIEXPORT jint JNICALL
60 Java_java_net_SocketInputStream_socketRead0(JNIEnv *env, jobject this,
61 jobject fdObj, jbyteArray data,
62 jint off, jint len, jint timeout)
63 {
64 char BUF[MAX_BUFFER_LEN];
65 char *bufP;
66 jint fd, nread;
67 long prevtime = 0, newtime;
68 struct timeval t;
69 long _timeout = timeout;
70
71 if (_timeout > 0) {
72 gettimeofday(&t, NULL);
73 prevtime = t.tv_sec * 1000 + t.tv_usec / 1000;
74 }
75
76 if (IS_NULL(fdObj)) {
77 /* shouldn't this be a NullPointerException? -br */
78 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
79 "Socket closed");
80 return -1;
81 } else {
82 fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
83 /* Bug 4086704 - If the Socket associated with this file descriptor
84 * was closed (sysCloseFD), then the file descriptor is set to -1.
85 */
86 if (fd == -1) {
87 JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
88 return -1;
89 }
90 }
91
92 /*
93 * If the read is greater than our stack allocated buffer then
94 * we allocate from the heap (up to a limit)
95 */
96 if (len > MAX_BUFFER_LEN) {
97 if (len > MAX_HEAP_BUFFER_LEN) {
98 len = MAX_HEAP_BUFFER_LEN;
99 }
100 bufP = (char *)malloc((size_t)len);
101 if (bufP == NULL) {
102 bufP = BUF;
103 len = MAX_BUFFER_LEN;
104 }
105 } else {
106 bufP = BUF;
107 }
108
109 LABEL: if (_timeout) {
110 nread = NET_Timeout(fd, _timeout);
111 if (nread <= 0) {
112 if (nread == 0) {
113 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketTimeoutException",
114 "Read timed out");
115 } else if (nread == -1) {
116 if (errno == EBADF) {
117 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Socket closed");
118 } else if (errno == ENOMEM) {
119 JNU_ThrowOutOfMemoryError(env, "NET_Timeout native heap allocation failed");
120 } else {
121 JNU_ThrowByNameWithMessageAndLastError
122 (env, JNU_JAVANETPKG "SocketException", "select/poll failed");
123 }
124 }
125 if (bufP != BUF) {
126 free(bufP);
127 }
128 return -1;
129 }
130 nread = NET_NonBlockingRead(fd, bufP, len);
131 if (nread == -1 && ((errno == EAGAIN) || (errno == EWOULDBLOCK))) {
132 gettimeofday(&t, NULL);
133 newtime = t.tv_sec * 1000 + t.tv_usec / 1000;
134 _timeout -= newtime - prevtime;
135 if(_timeout > 0){
136 prevtime = newtime;
137 goto LABEL;
138 }
139 }
140 } else { // no timeout set, it has to be blocking call.
141 nread = NET_Read(fd, bufP, len);
142 }
143 if (nread <= 0) {
144 if (nread < 0) {
145
146 switch (errno) {
147 case ECONNRESET:
148 case EPIPE:
149 JNU_ThrowByName(env, "sun/net/ConnectionResetException",
150 "Connection reset");
151 break;
152
153 case EBADF:
154 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
155 "Socket closed");
156 break;
157
158 case EINTR:
159 JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",
160 "Operation interrupted");
161 break;
162 default:
163 JNU_ThrowByNameWithMessageAndLastError
164 (env, JNU_JAVANETPKG "SocketException", "Read failed");
165 }
166 }
167 } else {
168 (*env)->SetByteArrayRegion(env, data, off, nread, (jbyte *)bufP);
169 }
170
171 if (bufP != BUF) {
172 free(bufP);
173 }
174 return nread;
175 }