1 /*
2 * Copyright (c) 1996, 2015, 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
27 package sun.security.ssl;
28
29 import java.io.InputStream;
30 import java.io.IOException;
31 import java.nio.ByteBuffer;
32
33 import javax.net.ssl.SSLProtocolException;
34
35 /**
36 * InputStream for application data as returned by SSLSocket.getInputStream().
37 *
38 * @author David Brownell
39 */
40 final class AppInputStream extends InputStream {
41 // the buffer size for each read of network data
42 private static final int READ_BUFFER_SIZE = 4096;
43
44 // static dummy array we use to implement skip()
45 private static final byte[] SKIP_ARRAY = new byte[256];
46
47 // the related socket of the input stream
48 private final SSLSocketImpl socket;
49
50 // the temporary buffer used to read network
51 private ByteBuffer buffer;
52
53 // Is application data available in the stream?
54 private boolean appDataIsAvailable;
55
56 // One element array used to implement the single byte read() method
57 private final byte[] oneByte = new byte[1];
58
59 AppInputStream(SSLSocketImpl conn) {
60 this.buffer = ByteBuffer.allocate(READ_BUFFER_SIZE);
61 this.socket = conn;
62 this.appDataIsAvailable = false;
63 }
64
65 /**
66 * Return the minimum number of bytes that can be read without blocking.
67 *
68 * Currently not synchronized.
69 */
70 @Override
71 public int available() throws IOException {
72 if ((!appDataIsAvailable) || socket.checkEOF()) {
73 return 0;
74 }
75
76 return buffer.remaining();
77 }
78
79 /**
80 * Read a single byte, returning -1 on non-fault EOF status.
81 */
82 @Override
83 public synchronized int read() throws IOException {
84 int n = read(oneByte, 0, 1);
85 if (n <= 0) { // EOF
86 return -1;
87 }
88 return oneByte[0] & 0xFF;
89 }
90
91 /**
92 * Reads up to {@code len} bytes of data from the input stream into an
93 * array of bytes. An attempt is made to read as many as {@code len} bytes,
94 * but a smaller number may be read. The number of bytes actually read
95 * is returned as an integer.
96 *
97 * If the layer above needs more data, it asks for more, so we
98 * are responsible only for blocking to fill at most one buffer,
99 * and returning "-1" on non-fault EOF status.
100 */
101 @Override
102 public synchronized int read(byte[] b, int off, int len)
103 throws IOException {
104 if (b == null) {
105 throw new NullPointerException();
106 } else if (off < 0 || len < 0 || len > b.length - off) {
107 throw new IndexOutOfBoundsException();
108 } else if (len == 0) {
109 return 0;
110 }
111
112 if (socket.checkEOF()) {
113 return -1;
114 }
115
116 // Read the available bytes at first.
117 int remains = available();
118 if (remains > 0) {
119 int howmany = Math.min(remains, len);
120 buffer.get(b, off, howmany);
121
122 return howmany;
123 }
124
125 appDataIsAvailable = false;
126 int volume = 0;
127
128 try {
129 /*
130 * Read data if needed ... notice that the connection guarantees
131 * that handshake, alert, and change cipher spec data streams are
132 * handled as they arrive, so we never see them here.
133 */
134 while(volume == 0) {
135 // Clear the buffer for a new record reading.
136 buffer.clear();
137
138 //
139 // grow the buffer if needed
140 //
141
142 // Read the header of a record into the buffer, and return
143 // the packet size.
144 int packetLen = socket.bytesInCompletePacket();
145 if (packetLen < 0) { // EOF
146 return -1;
147 }
148
149 // Is this packet bigger than SSL/TLS normally allows?
150 if (packetLen > SSLRecord.maxLargeRecordSize) {
151 throw new SSLProtocolException(
152 "Illegal packet size: " + packetLen);
153 }
154
155 if (packetLen > buffer.remaining()) {
156 buffer = ByteBuffer.allocate(packetLen);
157 }
158
159 volume = socket.readRecord(buffer);
160 if (volume < 0) { // EOF
161 return -1;
162 } else if (volume > 0) {
163 appDataIsAvailable = true;
164 break;
165 }
166 }
167
168 int howmany = Math.min(len, volume);
169 buffer.get(b, off, howmany);
170 return howmany;
171 } catch (Exception e) {
172 // shutdown and rethrow (wrapped) exception as appropriate
173 socket.handleException(e);
174
175 // dummy for compiler
176 return -1;
177 }
178 }
179
180
181 /**
182 * Skip n bytes. This implementation is somewhat less efficient
183 * than possible, but not badly so (redundant copy). We reuse
184 * the read() code to keep things simpler. Note that SKIP_ARRAY
185 * is static and may garbled by concurrent use, but we are not interested
186 * in the data anyway.
187 */
188 @Override
189 public synchronized long skip(long n) throws IOException {
190 long skipped = 0;
191 while (n > 0) {
192 int len = (int)Math.min(n, SKIP_ARRAY.length);
193 int r = read(SKIP_ARRAY, 0, len);
194 if (r <= 0) {
195 break;
196 }
197 n -= r;
198 skipped += r;
199 }
200 return skipped;
201 }
202
203 /*
204 * Socket close is already synchronized, no need to block here.
205 */
206 @Override
207 public void close() throws IOException {
208 socket.close();
209 }
210
211 // inherit default mark/reset behavior (throw Exceptions) from InputStream
212 }