1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
|
// DatagramSocket.java
/* Copyright (C) 1999 Cygnus Solutions
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.net;
import java.io.IOException;
/**
* @author Warren Levy <warrenl@cygnus.com>
* @date May 3, 1999.
*/
/**
* Written using on-line Java Platform 1.2 API Specification, as well
* as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998).
* Status: Believed complete and correct.
*/
public class DatagramSocket
{
DatagramSocketImpl impl;
public DatagramSocket() throws SocketException
{
this(0, null);
}
public DatagramSocket(int port) throws SocketException
{
this(port, null);
}
public DatagramSocket(int port, InetAddress laddr) throws SocketException
{
if (port < 0 || port > 65535)
throw new IllegalArgumentException("Invalid port: " + port);
SecurityManager s = System.getSecurityManager();
if (s != null)
s.checkListen(port);
String propVal = System.getProperty("impl.prefix");
if (propVal == null || propVal.equals(""))
propVal = "Plain";
impl = (DatagramSocketImpl) Class.forName("java.net." + propVal +
"DatagramSocketImpl").newInstance();
impl.create();
// For multicasting, set the socket to be reused (Stevens pp. 195-6).
if (this instanceof MulticastSocket)
impl.setOption(SocketOptions.SO_REUSEADDR, new Boolean(true));
impl.bind(port, laddr);
}
public void close()
{
impl.close();
}
public InetAddress getLocalAddress()
{
SecurityManager s = System.getSecurityManager();
// FIXME: JCL p. 510 says this should call checkConnect. But what
// string should be used as the hostname? Maybe this is just a side
// effect of calling InetAddress.getLocalHost.
//
// And is getOption with SO_BINDADDR the right way to get the address?
// Doesn't seem to be since this method doesn't throw a SocketException
// and SO_BINADDR can throw one.
//
// Also see RETURNS section in JCL p. 510 about returning any local
// addr "if the current execution context is not allowed to connect to
// the network interface that is actually bound to this datagram socket."
// How is that done? via InetAddress.getLocalHost? But that throws
// an UnknownHostException and this method doesn't.
//
// if (s != null)
// s.checkConnect("localhost", -1);
try
{
return (InetAddress)impl.getOption(SocketOptions.SO_BINDADDR);
}
catch (SocketException ex)
{
}
try
{
return InetAddress.getLocalHost();
}
catch (UnknownHostException ex)
{
// FIXME: This should never happen, so how can we avoid this construct?
return null;
}
}
public int getLocalPort()
{
return impl.getLocalPort();
}
public synchronized int getSoTimeout() throws SocketException
{
Object timeout = impl.getOption(SocketOptions.SO_TIMEOUT);
if (timeout instanceof Integer)
return ((Integer)timeout).intValue();
else
return 0;
}
public synchronized void receive(DatagramPacket p) throws IOException
{
SecurityManager s = System.getSecurityManager();
if (s != null)
s.checkAccept(p.getAddress().getHostAddress(), p.getPort());
impl.receive(p);
}
public void send(DatagramPacket p) throws IOException
{
// JDK1.2: Don't do security checks if socket is connected; see jdk1.2 api.
SecurityManager s = System.getSecurityManager();
if (s != null)
{
InetAddress addr = p.getAddress();
if (addr.isMulticastAddress())
s.checkMulticast(addr);
else
s.checkConnect(addr.getHostAddress(), p.getPort());
}
// FIXME: if this is a subclass of MulticastSocket, use getTTL for TTL val.
impl.send(p);
}
public synchronized void setSoTimeout(int timeout) throws SocketException
{
if (timeout < 0)
throw new IllegalArgumentException("Invalid timeout: " + timeout);
impl.setOption(SocketOptions.SO_TIMEOUT, new Integer(timeout));
}
// JDK1.2
// public void connect(InetAddress address, int port)
// {
// }
// JDK1.2
// public void disconnect()
// {
// }
// JDK1.2
// public InetAddress getInetAddress()
// {
// }
// JDK1.2
// public int getPort()
// {
// }
// JDK1.2
// public int getReceiveBufferSize() throws SocketException
// {
// }
// JDK1.2
// public int getSendBufferSize() throws SocketException
// {
// }
// JDK1.2
// public void setReceiveBufferSize(int size) throws SocketException
// {
// }
// JDK1.2
// public void setSendBufferSize(int size) throws SocketException
// {
// }
}
|
