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java.lang.Objectorg.apache.hadoop.net.DNS
public class DNS
A class that provides direct and reverse lookup functionalities, allowing the querying of specific network interfaces or nameservers.
| Field Summary | |
|---|---|
static org.apache.commons.logging.Log |
LOG
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| Constructor Summary | |
|---|---|
DNS()
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| Method Summary | |
|---|---|
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 |
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 |
static String |
getDefaultIP(String strInterface)
Returns the first available IP address associated with the provided network interface |
static String[] |
getHosts(String strInterface)
Returns all the host names associated by the default nameserver with the address bound to the specified network interface |
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 |
static String[] |
getIPs(String strInterface)
Like getIPs(String, boolean), but returns all
IPs associated with the given interface and its subinterfaces. |
static String[] |
getIPs(String strInterface,
boolean returnSubinterfaces)
Returns all the IPs associated with the provided interface, if any, in textual form. |
static String |
reverseDns(InetAddress hostIp,
String ns)
Returns the hostname associated with the specified IP address by the provided nameserver. |
| Methods inherited from class java.lang.Object |
|---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
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public static final org.apache.commons.logging.Log LOG
| Constructor Detail |
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public DNS()
| Method Detail |
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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 server
NamingException - If a NamingException is encountered
public static String[] getIPs(String strInterface)
throws UnknownHostException
getIPs(String, boolean), but returns all
IPs associated with the given interface and its subinterfaces.
UnknownHostException
public static String[] getIPs(String strInterface,
boolean returnSubinterfaces)
throws UnknownHostException
strInterface - The name of the network interface or subinterface to query
(eg eth0 or eth0:0) or the string "default"returnSubinterfaces - Whether to return IPs associated with subinterfaces of
the given interface
UnknownHostException - If an UnknownHostException is encountered in querying the
default interface or the given interface can not be found
public 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 one is encountered in querying the default interface
public 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) or the string "default"nameserver - The DNS host name
UnknownHostException
public 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 deault interface
public 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 name
UnknownHostException - If one is encountered while querying the deault interface
public static String getDefaultHost(String strInterface)
throws UnknownHostException
strInterface - The name of the network interface to query (e.g. eth0)
UnknownHostException - If one is encountered while querying the deault interface
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