Shuyi Chen | d7955ce | 2013-05-22 14:51:55 -0700 | [diff] [blame] | 1 | // Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org) |
| 2 | |
| 3 | package org.xbill.DNS; |
| 4 | |
| 5 | import java.io.*; |
| 6 | |
| 7 | /** |
| 8 | * Server Selection Record - finds hosts running services in a domain. An |
| 9 | * SRV record will normally be named _<service>._<protocol>.domain |
| 10 | * - examples would be _sips._tcp.example.org (for the secure SIP protocol) and |
| 11 | * _http._tcp.example.com (if HTTP used SRV records) |
| 12 | * |
| 13 | * @author Brian Wellington |
| 14 | */ |
| 15 | |
| 16 | public class SRVRecord extends Record { |
| 17 | |
| 18 | private static final long serialVersionUID = -3886460132387522052L; |
| 19 | |
| 20 | private int priority, weight, port; |
| 21 | private Name target; |
| 22 | |
| 23 | SRVRecord() {} |
| 24 | |
| 25 | Record |
| 26 | getObject() { |
| 27 | return new SRVRecord(); |
| 28 | } |
| 29 | |
| 30 | /** |
| 31 | * Creates an SRV Record from the given data |
| 32 | * @param priority The priority of this SRV. Records with lower priority |
| 33 | * are preferred. |
| 34 | * @param weight The weight, used to select between records at the same |
| 35 | * priority. |
| 36 | * @param port The TCP/UDP port that the service uses |
| 37 | * @param target The host running the service |
| 38 | */ |
| 39 | public |
| 40 | SRVRecord(Name name, int dclass, long ttl, int priority, |
| 41 | int weight, int port, Name target) |
| 42 | { |
| 43 | super(name, Type.SRV, dclass, ttl); |
| 44 | this.priority = checkU16("priority", priority); |
| 45 | this.weight = checkU16("weight", weight); |
| 46 | this.port = checkU16("port", port); |
| 47 | this.target = checkName("target", target); |
| 48 | } |
| 49 | |
| 50 | void |
| 51 | rrFromWire(DNSInput in) throws IOException { |
| 52 | priority = in.readU16(); |
| 53 | weight = in.readU16(); |
| 54 | port = in.readU16(); |
| 55 | target = new Name(in); |
| 56 | } |
| 57 | |
| 58 | void |
| 59 | rdataFromString(Tokenizer st, Name origin) throws IOException { |
| 60 | priority = st.getUInt16(); |
| 61 | weight = st.getUInt16(); |
| 62 | port = st.getUInt16(); |
| 63 | target = st.getName(origin); |
| 64 | } |
| 65 | |
| 66 | /** Converts rdata to a String */ |
| 67 | String |
| 68 | rrToString() { |
| 69 | StringBuffer sb = new StringBuffer(); |
| 70 | sb.append(priority + " "); |
| 71 | sb.append(weight + " "); |
| 72 | sb.append(port + " "); |
| 73 | sb.append(target); |
| 74 | return sb.toString(); |
| 75 | } |
| 76 | |
| 77 | /** Returns the priority */ |
| 78 | public int |
| 79 | getPriority() { |
| 80 | return priority; |
| 81 | } |
| 82 | |
| 83 | /** Returns the weight */ |
| 84 | public int |
| 85 | getWeight() { |
| 86 | return weight; |
| 87 | } |
| 88 | |
| 89 | /** Returns the port that the service runs on */ |
| 90 | public int |
| 91 | getPort() { |
| 92 | return port; |
| 93 | } |
| 94 | |
| 95 | /** Returns the host running that the service */ |
| 96 | public Name |
| 97 | getTarget() { |
| 98 | return target; |
| 99 | } |
| 100 | |
| 101 | void |
| 102 | rrToWire(DNSOutput out, Compression c, boolean canonical) { |
| 103 | out.writeU16(priority); |
| 104 | out.writeU16(weight); |
| 105 | out.writeU16(port); |
| 106 | target.toWire(out, null, canonical); |
| 107 | } |
| 108 | |
| 109 | public Name |
| 110 | getAdditionalName() { |
| 111 | return target; |
| 112 | } |
| 113 | |
| 114 | } |