Package org.jivesoftware.smack.util.dns

Class DNSResolver

java.lang.Object
org.jivesoftware.smack.util.dns.DNSResolver
public abstract class DNSResolver extends Object
Implementations of this interface define a class that is capable of resolving DNS addresses.

  • Field Details

    • LOGGER

      protected static final Logger LOGGER

  • Constructor Details

    • DNSResolver

      protected DNSResolver(boolean supportsDnssec)

  • Method Details

    • lookupSrvRecords

      public final Collection<org.minidns.record.SRV> lookupSrvRecords(org.minidns.dnsname.DnsName name, List<RemoteConnectionEndpointLookupFailure> lookupFailures, ConnectionConfiguration.DnssecMode dnssecMode)
      Gets a list of service records for the specified service.
      Parameters:
      name - The symbolic name of the service.
      lookupFailures - list of exceptions that occurred during lookup.
      dnssecMode - security mode.
      Returns:
      The list of SRV records mapped to the service name.

    • lookupSrvRecords0

      protected abstract Collection<org.minidns.record.SRV> lookupSrvRecords0(org.minidns.dnsname.DnsName name, List<RemoteConnectionEndpointLookupFailure> lookupFailures, ConnectionConfiguration.DnssecMode dnssecMode)

    • lookupHostAddress

      public final List<InetAddress> lookupHostAddress(org.minidns.dnsname.DnsName name, List<RemoteConnectionEndpointLookupFailure> lookupFailures, ConnectionConfiguration.DnssecMode dnssecMode)

    • lookupHostAddress0

      protected List<InetAddress> lookupHostAddress0(org.minidns.dnsname.DnsName name, List<RemoteConnectionEndpointLookupFailure> lookupFailures, ConnectionConfiguration.DnssecMode dnssecMode)
      Lookup the IP addresses of a given host name. Returns null if there was an error, in which the error reason will be added in form of a HostAddress to failedAddresses. Returns a empty list in case the DNS name exists but has no associated A or AAAA resource records. Otherwise, if the resolution was successful and there is at least one A or AAAA resource record, then a non-empty list will be returned.

      Concrete DNS resolver implementations are free to overwrite this, but have to stick to the interface contract.

      Parameters:
      name - the DNS name to lookup
      lookupFailures - list of exceptions that occurred during lookup.
      dnssecMode - the selected DNSSEC mode
      Returns:
      A list, either empty or non-empty, or null

    • shouldContinue

      protected static boolean shouldContinue(CharSequence name, CharSequence hostname, List<InetAddress> hostAddresses)