Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | /** |
| 2 | * Copyright 2013 Florian Schmaus |
| 3 | * |
| 4 | * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | package org.jivesoftware.smack.util.dns; |
| 17 | |
| 18 | import java.util.ArrayList; |
| 19 | import java.util.List; |
| 20 | |
| 21 | import org.xbill.DNS.Lookup; |
| 22 | import org.xbill.DNS.Record; |
| 23 | import org.xbill.DNS.Type; |
| 24 | |
| 25 | /** |
| 26 | * This implementation uses the <a href="http://www.dnsjava.org/">dnsjava</a> implementation for resolving DNS addresses. |
| 27 | * |
| 28 | */ |
| 29 | public class DNSJavaResolver implements DNSResolver { |
| 30 | |
| 31 | private static DNSJavaResolver instance = new DNSJavaResolver(); |
| 32 | |
| 33 | private DNSJavaResolver() { |
| 34 | |
| 35 | } |
| 36 | |
| 37 | public static DNSResolver getInstance() { |
| 38 | return instance; |
| 39 | } |
| 40 | |
| 41 | @Override |
| 42 | public List<SRVRecord> lookupSRVRecords(String name) { |
| 43 | List<SRVRecord> res = new ArrayList<SRVRecord>(); |
| 44 | |
| 45 | try { |
| 46 | Lookup lookup = new Lookup(name, Type.SRV); |
| 47 | Record recs[] = lookup.run(); |
| 48 | if (recs == null) |
| 49 | return res; |
| 50 | |
| 51 | for (Record record : recs) { |
| 52 | org.xbill.DNS.SRVRecord srvRecord = (org.xbill.DNS.SRVRecord) record; |
| 53 | if (srvRecord != null && srvRecord.getTarget() != null) { |
| 54 | String host = srvRecord.getTarget().toString(); |
| 55 | int port = srvRecord.getPort(); |
| 56 | int priority = srvRecord.getPriority(); |
| 57 | int weight = srvRecord.getWeight(); |
| 58 | |
| 59 | SRVRecord r; |
| 60 | try { |
| 61 | r = new SRVRecord(host, port, priority, weight); |
| 62 | } catch (Exception e) { |
| 63 | continue; |
| 64 | } |
| 65 | res.add(r); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | } catch (Exception e) { |
| 70 | } |
| 71 | return res; |
| 72 | } |
| 73 | } |