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
|
/*
* Jitsi, the OpenSource Java VoIP and Instant Messaging client.
*
* Copyright @ 2015 Atlassian Pty Ltd
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.java.sip.communicator.impl.protocol.sip;
import gov.nist.core.net.*;
import gov.nist.javax.sip.stack.*;
import java.net.*;
import javax.sip.*;
import javax.sip.address.*;
import net.java.sip.communicator.util.*;
/**
* Lookup for SRV records for given host. If nothing found
* the original host is returned this way when a Socket
* is constructed another dns lookup will be made for the A record.
*
* @author Damian Minkov
* @author Alan Kelly
* @author Emil Ivov
*/
public class AddressResolverImpl
implements AddressResolver
{
/**
* Our class logger
*/
private static final Logger logger
= Logger.getLogger(AddressResolverImpl.class);
/**
* Implements the actual resolving. This is where we do the DNS queries.
*
* @param inputAddress the unresolved <tt>Hop</tt> that we'd need to find
* an address for.
*
* @return the newly created <tt>Hop</tt> containing the resolved
* destination.
*/
public Hop resolveAddress(Hop inputAddress)
{
try
{
String transport = inputAddress.getTransport();
String hostAddress = inputAddress.getHost();
if (transport == null)
transport = ListeningPoint.UDP;
String host = null;
int port = 0;
// if it is a textual IP address, do no try to resolve it
if(NetworkUtils.isValidIPAddress(hostAddress))
{
InetSocketAddress hostSocketAddress = new InetSocketAddress(
NetworkUtils.getInetAddress(hostAddress),
inputAddress.getPort());
return new HopImpl(hostSocketAddress.getHostName(),
inputAddress.getPort(),
transport);
}
else if (transport.equalsIgnoreCase(ListeningPoint.TLS))
{
SRVRecord srvRecord = NetworkUtils.getSRVRecord(
"sips", ListeningPoint.TCP, hostAddress);
if(srvRecord != null)
{
host = srvRecord.getTarget();
port = srvRecord.getPort();
}
}
else
{
SRVRecord srvRecord = NetworkUtils.getSRVRecord(
"sip", transport, hostAddress);
if(srvRecord != null)
{
host = srvRecord.getTarget();
port = srvRecord.getPort();
}
}
if (host != null)
{
if(logger.isTraceEnabled())
logger.trace("Returning hop as follows"
+ " host= " + host
+ " port= " + port
+ " transport= " + transport);
return
new HopImpl(host, port, transport);
}
}
catch (Exception ex)
{
//could mean there was no SRV record
if(logger.isDebugEnabled())
logger.debug("Domain "+ inputAddress
+" could not be resolved " + ex.getMessage());
//show who called us
if(logger.isTraceEnabled())
logger.trace("Printing SRV resolution stack trace", ex);
}
Hop returnHop;
if (inputAddress.getPort() != -1)
{
returnHop = inputAddress;
}
else
{
String transport = inputAddress.getTransport();
returnHop
= new HopImpl(
inputAddress.getHost(),
MessageProcessor.getDefaultPort(transport),
transport);
}
if(logger.isDebugEnabled())
logger.debug("Returning hop: " + returnHop);
return returnHop;
}
}
|
