public class

JndiDnsResolver

extends Object
implements DnsResolver
java.lang.Object
   ↳ org.springframework.security.remoting.dns.JndiDnsResolver

Class Overview

Implementation of DnsResolver which uses JNDI for the DNS queries. Uses an InitialContextFactory to get the JNDI DirContext. The default implementation will just create a new Context with the context factory com.sun.jndi.dns.DnsContextFactory

See Also

Summary

Public Constructors
JndiDnsResolver()
Public Methods
String resolveIpAddress(String hostname)
Resolves the IP Address (A record) to the specified host name.
String resolveServiceEntry(String serviceType, String domain)

Resolves the host name for the specified service in the specified domain

For example, if you need the host name for an LDAP server running in the domain springsource.com, you would call resolveServiceEntry("ldap", "springsource.com").

String resolveServiceIpAddress(String serviceType, String domain)
Resolves the host name for the specified service and then the IP Address for this host in one call.
void setCtxFactory(InitialContextFactory ctxFactory)
Allows to inject an own JNDI context factory.
[Expand]
Inherited Methods
From class java.lang.Object
From interface org.springframework.security.remoting.dns.DnsResolver

Public Constructors

public JndiDnsResolver ()

Public Methods

public String resolveIpAddress (String hostname)

Resolves the IP Address (A record) to the specified host name. Throws DnsEntryNotFoundException if there is no record.

Parameters
hostname The hostname for which you need the IP Address
Returns
  • IP Address as a String

public String resolveServiceEntry (String serviceType, String domain)

Resolves the host name for the specified service in the specified domain

For example, if you need the host name for an LDAP server running in the domain springsource.com, you would call resolveServiceEntry("ldap", "springsource.com").

The DNS server needs to provide the service records for this, in the example above, it would look like this: 

_ldap._tcp.springsource.com IN SRV 10 0 88 ldap.springsource.com.
The method will return the record with highest priority (which means the lowest number in the DNS record) and if there are more than one records with the same priority, it will return the one with the highest weight. You will find more informatione about DNS service records at Wikipedia.

Parameters
serviceType The service type you are searching for, e.g. ldap, kerberos, ...
domain The domain, in which you are searching for the service
Returns
  • The hostname of the service

public String resolveServiceIpAddress (String serviceType, String domain)

Resolves the host name for the specified service and then the IP Address for this host in one call.

Parameters
serviceType The service type you are searching for, e.g. ldap, kerberos, ...
domain The domain, in which you are searching for the service
Returns
  • IP Address of the service

public void setCtxFactory (InitialContextFactory ctxFactory)

Allows to inject an own JNDI context factory.

Parameters
ctxFactory factory to use, when a DirContext is needed
See Also