@InterfaceAudience.LimitedPrivate(value={"HDFS","MapReduce"}) @InterfaceStability.Unstable public class DNS extends Object
Constructor and Description |
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DNS() |
Modifier and Type | Method and Description |
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static String |
getDefaultHost(String strInterface)
Returns the default (first) host name associated by the default
nameserver with the address bound to the specified network interface
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static String |
getDefaultHost(String strInterface,
String nameserver)
Returns the default (first) host name associated by the provided
nameserver with the address bound to the specified network interface
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static String |
getDefaultIP(String strInterface)
Returns the first available IP address associated with the provided
network interface or the local host IP if "default" is given.
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static String[] |
getHosts(String strInterface)
Returns all the host names associated by the default nameserver with the
address bound to the specified network interface
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static String[] |
getHosts(String strInterface,
String nameserver)
Returns all the host names associated by the provided nameserver with the
address bound to the specified network interface
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static String[] |
getIPs(String strInterface)
Like {@link DNS#getIPs(String, boolean), but returns all
IPs associated with the given interface and its subinterfaces.
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static String[] |
getIPs(String strInterface,
boolean returnSubinterfaces)
Returns all the IPs associated with the provided interface, if any, in
textual form.
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static String |
reverseDns(InetAddress hostIp,
String ns)
Returns the hostname associated with the specified IP address by the
provided nameserver.
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public static String reverseDns(InetAddress hostIp, String ns) throws NamingException
hostIp
- The address to reverse lookupns
- The host name of a reachable DNS serverNamingException
- If a NamingException is encounteredpublic static String[] getIPs(String strInterface) throws UnknownHostException
UnknownHostException
public static String[] getIPs(String strInterface, boolean returnSubinterfaces) throws UnknownHostException
strInterface
- The name of the network interface or sub-interface to query
(eg eth0 or eth0:0) or the string "default"returnSubinterfaces
- Whether to return IPs associated with subinterfaces of
the given interfaceUnknownHostException
- If the given interface is invalidpublic static String getDefaultIP(String strInterface) throws UnknownHostException
strInterface
- The name of the network interface or subinterface to query
(e.g. eth0 or eth0:0) or the string "default"UnknownHostException
- If the given interface is invalidpublic static String[] getHosts(String strInterface, String nameserver) throws UnknownHostException
strInterface
- The name of the network interface or subinterface to query
(e.g. eth0 or eth0:0)nameserver
- The DNS host nameUnknownHostException
- if the given interface is invalidpublic static String[] getHosts(String strInterface) throws UnknownHostException
strInterface
- The name of the network interface to query (e.g. eth0)UnknownHostException
- If one is encountered while querying the default interfacepublic static String getDefaultHost(String strInterface, String nameserver) throws UnknownHostException
strInterface
- The name of the network interface to query (e.g. eth0)nameserver
- The DNS host nameUnknownHostException
- If one is encountered while querying the default interfacepublic static String getDefaultHost(String strInterface) throws UnknownHostException
strInterface
- The name of the network interface to query (e.g. eth0).
Must not be null.UnknownHostException
- If one is encountered while querying the default interfaceCopyright © 2013 Apache Software Foundation. All rights reserved.