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58 lines
1.7 KiB
Java
58 lines
1.7 KiB
Java
package cc.fascinated.common;
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import cc.fascinated.model.dns.impl.ARecord;
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import cc.fascinated.model.dns.impl.SRVRecord;
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import lombok.NonNull;
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import lombok.SneakyThrows;
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import lombok.experimental.UtilityClass;
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import org.xbill.DNS.Lookup;
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import org.xbill.DNS.Record;
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import org.xbill.DNS.Type;
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/**
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* @author Braydon
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*/
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@UtilityClass
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public final class DNSUtils {
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private static final String SRV_QUERY_PREFIX = "_minecraft._tcp.%s";
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/**
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* Get the resolved address and port of the
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* given hostname by resolving the SRV records.
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*
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* @param hostname the hostname to resolve
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* @return the resolved address and port, null if none
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*/
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@SneakyThrows
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public static SRVRecord resolveSRV(@NonNull String hostname) {
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Record[] records = new Lookup(SRV_QUERY_PREFIX.formatted(hostname), Type.SRV).run(); // Resolve SRV records
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if (records == null) { // No records exist
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return null;
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}
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SRVRecord result = null;
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for (Record record : records) {
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result = new SRVRecord((org.xbill.DNS.SRVRecord) record);
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}
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return result;
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}
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/**
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* Get the resolved address of the given
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* hostname by resolving the A records.
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*
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* @param hostname the hostname to resolve
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* @return the resolved address, null if none
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*/
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@SneakyThrows
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public static ARecord resolveA(@NonNull String hostname) {
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Record[] records = new Lookup(hostname, Type.A).run(); // Resolve A records
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if (records == null) { // No records exist
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return null;
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}
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ARecord result = null;
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for (Record record : records) {
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result = new ARecord((org.xbill.DNS.ARecord) record);
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}
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return result;
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}
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} |