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 long getCurrentTime() {
55 struct timeval time;
56 gettimeofday(&time, NULL);
57 return (time.tv_sec * 1000 + time.tv_usec / 1000);
58 }
59
60 static int NET_TimeoutWithCurrentTime(int s, long timeout, long current_time) {
61 int result;
62 long prevtime = current_time, newtime;
63 struct pollfd pfd;
64 pfd.fd = s;
65 pfd.events = POLLIN;
66 for (;;) {
67 result = poll(&pfd, 1, timeout);
68 if (result < 0 && errno == EINTR) {
69 if (timeout > 0) {
70 newtime = getCurrentTime();
71 timeout -= newtime - prevtime;
72 if (timeout <= 0)
73 return 0;
74 prevtime = newtime;
75 }
76 } else {
77 return result;
78 }
79 }
80 }
81
82 static int NET_ReadWithTimeout(JNIEnv *env, int fd, char *bufP, int len, long timeout) {
83 int result;
84 long prevtime = getCurrentTime(), newtime;
85 while (timeout > 0) {
86 result = NET_TimeoutWithCurrentTime(fd, timeout, prevtime);
87 if (result <= 0) {
88 if (result == 0) {
89 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketTimeoutException", "Read timed out");
90 } else if (result == -1) {
91 if (errno == EBADF) {
92 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException", "Socket closed");
93 } else if (errno == ENOMEM) {
94 JNU_ThrowOutOfMemoryError(env, "NET_Timeout native heap allocation failed");
95 } else {
96 JNU_ThrowByNameWithMessageAndLastError
97 (env, JNU_JAVANETPKG "SocketException", "select/poll failed");
98 }
99 }
100 return -1;
101 }
102 result = NET_NonBlockingRead(fd, bufP, len);
103 if (result == -1 && ((errno == EAGAIN) || (errno == EWOULDBLOCK))) {
104 newtime = getCurrentTime();
105 timeout -= newtime - prevtime;
106 if (timeout > 0) {
107 prevtime = newtime;
108 }
109 } else {
110 break;
111 }
112 }
113 return result;
114 }
115
116 /*
117 * Class: java_net_SocketInputStream
118 * Method: socketRead0
119 * Signature: (Ljava/io/FileDescriptor;[BIII)I
120 */
121 JNIEXPORT jint JNICALL
122 Java_java_net_SocketInputStream_socketRead0(JNIEnv *env, jobject this,
123 jobject fdObj, jbyteArray data,
124 jint off, jint len, jint timeout)
125 {
126 char BUF[MAX_BUFFER_LEN];
127 char *bufP;
128 jint fd, nread;
129
130 if (IS_NULL(fdObj)) {
131 /* shouldn't this be a NullPointerException? -br */
132 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
133 "Socket closed");
134 return -1;
135 } else {
136 fd = (*env)->GetIntField(env, fdObj, IO_fd_fdID);
137 /* Bug 4086704 - If the Socket associated with this file descriptor
138 * was closed (sysCloseFD), then the file descriptor is set to -1.
139 */
140 if (fd == -1) {
141 JNU_ThrowByName(env, "java/net/SocketException", "Socket closed");
142 return -1;
143 }
144 }
145
146 /*
147 * If the read is greater than our stack allocated buffer then
148 * we allocate from the heap (up to a limit)
149 */
150 if (len > MAX_BUFFER_LEN) {
151 if (len > MAX_HEAP_BUFFER_LEN) {
152 len = MAX_HEAP_BUFFER_LEN;
153 }
154 bufP = (char *)malloc((size_t)len);
155 if (bufP == NULL) {
156 bufP = BUF;
157 len = MAX_BUFFER_LEN;
158 }
159 } else {
160 bufP = BUF;
161 }
162 if (timeout) {
163 nread = NET_ReadWithTimeout(env, fd, bufP, len, timeout);
164 } else {
165 nread = NET_Read(fd, bufP, len);
166 }
167 if (nread <= 0) {
168 if (nread < 0) {
169
170 switch (errno) {
171 case ECONNRESET:
172 case EPIPE:
173 JNU_ThrowByName(env, "sun/net/ConnectionResetException",
174 "Connection reset");
175 break;
176
177 case EBADF:
178 JNU_ThrowByName(env, JNU_JAVANETPKG "SocketException",
179 "Socket closed");
180 break;
181
182 case EINTR:
183 JNU_ThrowByName(env, JNU_JAVAIOPKG "InterruptedIOException",
184 "Operation interrupted");
185 break;
186 default:
187 JNU_ThrowByNameWithMessageAndLastError
188 (env, JNU_JAVANETPKG "SocketException", "Read failed");
189 }
190 }
191 } else {
192 (*env)->SetByteArrayRegion(env, data, off, nread, (jbyte *)bufP);
193 }
194
195 if (bufP != BUF) {
196 free(bufP);
197 }
198 return nread;
199 }