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java.lang.Object org.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 | |
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static org.apache.commons.logging.Log |
LOG
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Constructor Summary | |
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DNS()
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Method Summary | |
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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 |
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 |
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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 encounteredpublic 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 foundpublic 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 interfacepublic 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 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 name
UnknownHostException
- If one is encountered while querying the deault interfacepublic 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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