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      1 // Copyright (c) 1999-2004 Brian Wellington (bwelling (at) 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 }
    115