Package rocks.xmpp.dns

Class DnsResolver

java.lang.Object

rocks.xmpp.dns.DnsResolver

public final class DnsResolver
extends Object

A minimalistic DNS resolver, which can resolve SRV and TXT records in the context of XMPP.

See Also:

RFC 6120 3.2.1. Preferred Process: SRV Lookup, XEP-0156: Discovering Alternative XMPP Connection Methods

Method Summary

Modifier and Type	Method	Description
static List<SrvRecord>	resolveSRV(CharSequence service, CharSequence domain, String nameServer, long timeout)	Resolves DNS SRV records for the given domain.
static List<TxtRecord>	resolveTXT(CharSequence domain, String nameServer, long timeout)	Resolves DNS TXT records for the given domain.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

resolveSRV

public static List<SrvRecord> resolveSRV(CharSequence service,
                                         CharSequence domain,
                                         String nameServer,
                                         long timeout)
                                  throws IOException

Resolves DNS SRV records for the given domain.

The service is "xmpp-client", the protocol is "tcp", resulting in a query of _xmpp-client._tcp.domain.

Parameters:

service - The service, usually "xmpp-client" or "xmpps-client".

domain - The domain.

nameServer - The name server.

timeout - The timeout.

Returns:

The DNS SRV records.

Throws:

IOException - If a timeout occurs or no connection to the DNS server can be established.

See Also:

RFC 6120 3.2.1. Preferred Process: SRV Lookup

resolveTXT

public static List<TxtRecord> resolveTXT(CharSequence domain,
                                         String nameServer,
                                         long timeout)
                                  throws IOException

Resolves DNS TXT records for the given domain.

Parameters:

domain - The domain.

nameServer - The name server.

timeout - The timeout.

Returns:

The DNS SRV records.

Throws:

IOException - If a timeout occurs or no connection to the DNS server can be established.

See Also:

XEP-0156: Discovering Alternative XMPP Connection Methods