1package eu.siacs.conversations.utils;
2
3import de.measite.minidns.Client;
4import de.measite.minidns.DNSMessage;
5import de.measite.minidns.Record;
6import de.measite.minidns.Record.TYPE;
7import de.measite.minidns.Record.CLASS;
8import de.measite.minidns.record.SRV;
9import de.measite.minidns.record.A;
10import de.measite.minidns.record.AAAA;
11import de.measite.minidns.record.Data;
12import de.measite.minidns.util.NameUtil;
13import eu.siacs.conversations.Config;
14import eu.siacs.conversations.xmpp.jid.Jid;
15
16import java.io.IOException;
17import java.net.InetAddress;
18import java.net.SocketTimeoutException;
19import java.util.ArrayList;
20import java.util.Collections;
21import java.util.Random;
22import java.util.TreeMap;
23import java.util.regex.Pattern;
24
25import android.os.Bundle;
26import android.util.Log;
27
28public class DNSHelper {
29
30 public static final Pattern PATTERN_IPV4 = Pattern.compile("\\A(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z");
31 public static final Pattern PATTERN_IPV6_HEX4DECCOMPRESSED = Pattern.compile("\\A((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?) ::((?:[0-9A-Fa-f]{1,4}:)*)(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z");
32 public static final Pattern PATTERN_IPV6_6HEX4DEC = Pattern.compile("\\A((?:[0-9A-Fa-f]{1,4}:){6,6})(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)(\\.(25[0-5]|2[0-4]\\d|[0-1]?\\d?\\d)){3}\\z");
33 public static final Pattern PATTERN_IPV6_HEXCOMPRESSED = Pattern.compile("\\A((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)::((?:[0-9A-Fa-f]{1,4}(?::[0-9A-Fa-f]{1,4})*)?)\\z");
34 public static final Pattern PATTERN_IPV6 = Pattern.compile("\\A(?:[0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}\\z");
35
36 protected static Client client = new Client();
37
38 public static Bundle getSRVRecord(final Jid jid) throws IOException {
39 final String host = jid.getDomainpart();
40 String dns[] = client.findDNS();
41
42 if (dns != null) {
43 for (String dnsserver : dns) {
44 InetAddress ip = InetAddress.getByName(dnsserver);
45 Bundle b = queryDNS(host, ip);
46 if (b.containsKey("values")) {
47 return b;
48 }
49 }
50 }
51 return queryDNS(host, InetAddress.getByName("8.8.8.8"));
52 }
53
54 public static Bundle queryDNS(String host, InetAddress dnsServer) {
55 Bundle bundle = new Bundle();
56 try {
57 String qname = "_xmpp-client._tcp." + host;
58 Log.d(Config.LOGTAG, "using dns server: " + dnsServer.getHostAddress() + " to look up " + host);
59 DNSMessage message = client.query(qname, TYPE.SRV, CLASS.IN, dnsServer.getHostAddress());
60
61 TreeMap<Integer, ArrayList<SRV>> priorities = new TreeMap<>();
62 TreeMap<String, ArrayList<String>> ips4 = new TreeMap<>();
63 TreeMap<String, ArrayList<String>> ips6 = new TreeMap<>();
64
65 for (Record[] rrset : new Record[][] { message.getAnswers(), message.getAdditionalResourceRecords() }) {
66 for (Record rr : rrset) {
67 Data d = rr.getPayload();
68 if (d instanceof SRV && NameUtil.idnEquals(qname, rr.getName())) {
69 SRV srv = (SRV) d;
70 if (!priorities.containsKey(srv.getPriority())) {
71 priorities.put(srv.getPriority(),new ArrayList<SRV>());
72 }
73 priorities.get(srv.getPriority()).add(srv);
74 }
75 if (d instanceof A) {
76 A a = (A) d;
77 if (!ips4.containsKey(rr.getName())) {
78 ips4.put(rr.getName(), new ArrayList<String>());
79 }
80 ips4.get(rr.getName()).add(a.toString());
81 }
82 if (d instanceof AAAA) {
83 AAAA aaaa = (AAAA) d;
84 if (!ips6.containsKey(rr.getName())) {
85 ips6.put(rr.getName(), new ArrayList<String>());
86 }
87 ips6.get(rr.getName()).add("[" + aaaa.toString() + "]");
88 }
89 }
90 }
91
92 ArrayList<SRV> result = new ArrayList<>();
93 for (ArrayList<SRV> s : priorities.values()) {
94 result.addAll(s);
95 }
96
97 ArrayList<Bundle> values = new ArrayList<>();
98 if (result.size() == 0) {
99 DNSMessage response;
100 response = client.query(host, TYPE.A, CLASS.IN, dnsServer.getHostAddress());
101 for(int i = 0; i < response.getAnswers().length; ++i) {
102 values.add(createNamePortBundle(host,5222,response.getAnswers()[i].getPayload()));
103 }
104 response = client.query(host, TYPE.AAAA, CLASS.IN, dnsServer.getHostAddress());
105 for(int i = 0; i < response.getAnswers().length; ++i) {
106 values.add(createNamePortBundle(host,5222,response.getAnswers()[i].getPayload()));
107 }
108 values.add(createNamePortBundle(host,5222));
109 bundle.putParcelableArrayList("values", values);
110 return bundle;
111 }
112 for (SRV srv : result) {
113 if (ips6.containsKey(srv.getName())) {
114 values.add(createNamePortBundle(srv.getName(),srv.getPort(),ips6));
115 } else {
116 DNSMessage response = client.query(srv.getName(), TYPE.AAAA, CLASS.IN, dnsServer.getHostAddress());
117 for(int i = 0; i < response.getAnswers().length; ++i) {
118 values.add(createNamePortBundle(srv.getName(),srv.getPort(),response.getAnswers()[i].getPayload()));
119 }
120 }
121 if (ips4.containsKey(srv.getName())) {
122 values.add(createNamePortBundle(srv.getName(),srv.getPort(),ips4));
123 } else {
124 DNSMessage response = client.query(srv.getName(), TYPE.A, CLASS.IN, dnsServer.getHostAddress());
125 for(int i = 0; i < response.getAnswers().length; ++i) {
126 values.add(createNamePortBundle(srv.getName(),srv.getPort(),response.getAnswers()[i].getPayload()));
127 }
128 }
129 values.add(createNamePortBundle(srv.getName(), srv.getPort()));
130 }
131 bundle.putParcelableArrayList("values", values);
132 } catch (SocketTimeoutException e) {
133 bundle.putString("error", "timeout");
134 } catch (Exception e) {
135 e.printStackTrace();
136 bundle.putString("error", "unhandled");
137 }
138 return bundle;
139 }
140
141 private static Bundle createNamePortBundle(String name, int port) {
142 Bundle namePort = new Bundle();
143 namePort.putString("name", name);
144 namePort.putInt("port", port);
145 return namePort;
146 }
147
148 private static Bundle createNamePortBundle(String name, int port, TreeMap<String, ArrayList<String>> ips) {
149 Bundle namePort = new Bundle();
150 namePort.putString("name", name);
151 namePort.putInt("port", port);
152 if (ips!=null) {
153 ArrayList<String> ip = ips.get(name);
154 Collections.shuffle(ip, new Random());
155 namePort.putString("ip", ip.get(0));
156 }
157 return namePort;
158 }
159
160 private static Bundle createNamePortBundle(String name, int port, Data data) {
161 Bundle namePort = new Bundle();
162 namePort.putString("name", name);
163 namePort.putInt("port", port);
164 if (data instanceof A) {
165 namePort.putString("ip", data.toString());
166 } else if (data instanceof AAAA) {
167 namePort.putString("ip","["+data.toString()+"]");
168 }
169 return namePort;
170 }
171
172 public static boolean isIp(final String server) {
173 return PATTERN_IPV4.matcher(server).matches()
174 || PATTERN_IPV6.matcher(server).matches()
175 || PATTERN_IPV6_6HEX4DEC.matcher(server).matches()
176 || PATTERN_IPV6_HEX4DECCOMPRESSED.matcher(server).matches()
177 || PATTERN_IPV6_HEXCOMPRESSED.matcher(server).matches();
178 }
179}