WifiP2pDnsSdServiceInfo.java revision 527ba07b637cedf206fec0d3b0cf92141700a23c
121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff/* 221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Copyright (C) 2012 The Android Open Source Project 321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Licensed under the Apache License, Version 2.0 (the "License"); 521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * you may not use this file except in compliance with the License. 621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * You may obtain a copy of the License at 721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * http://www.apache.org/licenses/LICENSE-2.0 921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 1021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Unless required by applicable law or agreed to in writing, software 1121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * distributed under the License is distributed on an "AS IS" BASIS, 1221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * See the License for the specific language governing permissions and 1421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * limitations under the License. 1521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 1621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 1721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriffpackage android.net.wifi.p2p.nsd; 1821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 1921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriffimport android.net.nsd.DnsSdTxtRecord; 2021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriffimport android.text.TextUtils; 2121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 2221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriffimport java.util.ArrayList; 2321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriffimport java.util.HashMap; 2421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriffimport java.util.List; 2521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriffimport java.util.Map; 2621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 2721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff/** 288bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * A class for storing Bonjour service information that is advertised 298bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * over a Wi-Fi peer-to-peer setup. 308bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * 318bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * {@see android.net.wifi.p2p.WifiP2pManager#addLocalService} 328bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * {@see android.net.wifi.p2p.WifiP2pManager#removeLocalService} 338bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * {@see WifiP2pServiceInfo} 348bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * {@see WifiP2pUpnpServiceInfo} 3521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 368bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriffpublic class WifiP2pDnsSdServiceInfo extends WifiP2pServiceInfo { 3721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 3821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 3921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Bonjour version 1. 4021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @hide 4121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 4221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff public static final int VERSION_1 = 0x01; 4321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 4421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 4521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Pointer record. 4621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @hide 4721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 4821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff public static final int DNS_TYPE_PTR = 12; 4921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 5021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 5121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Text record. 5221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @hide 5321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 5421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff public static final int DNS_TYPE_TXT = 16; 5521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 5621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 5721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * virtual memory packet. 5821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * see E.3 of the Wi-Fi Direct technical specification for the detail.<br> 5921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Key: domain name Value: pointer address.<br> 6021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 6121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff private final static Map<String, String> sVmPacket; 6221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 6321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff static { 6421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sVmPacket = new HashMap<String, String>(); 6521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sVmPacket.put("_tcp.local.", "c00c"); 6621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sVmPacket.put("local.", "c011"); 6721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sVmPacket.put("_udp.local.", "c01c"); 6821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 6921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 7021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 7121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * This constructor is only used in newInstance(). 7221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 7321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param queryList 7421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 758bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff private WifiP2pDnsSdServiceInfo(List<String> queryList) { 7621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff super(queryList); 7721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 7821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 7921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 808bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * Create a Bonjour service information object. 8121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 8221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param instanceName instance name.<br> 8321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * e.g) "MyPrinter" 848bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * @param serviceType service type.<br> 858bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * e.g) "_ipp._tcp" 86527ba07b637cedf206fec0d3b0cf92141700a23cIrfan Sheriff * @param txtMap TXT record with key/value pair in a map confirming to format defined at 878bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * http://files.dns-sd.org/draft-cheshire-dnsext-dns-sd.txt 8821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @return Bonjour service information object 8921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 908bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff public static WifiP2pDnsSdServiceInfo newInstance(String instanceName, 91527ba07b637cedf206fec0d3b0cf92141700a23cIrfan Sheriff String serviceType, Map<String, String> txtMap) { 928bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff if (TextUtils.isEmpty(instanceName) || TextUtils.isEmpty(serviceType)) { 9321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff throw new IllegalArgumentException( 948bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff "instance name or service type cannot be empty"); 9521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 9621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 97527ba07b637cedf206fec0d3b0cf92141700a23cIrfan Sheriff DnsSdTxtRecord txtRecord = new DnsSdTxtRecord(); 98527ba07b637cedf206fec0d3b0cf92141700a23cIrfan Sheriff if (txtMap != null) { 99527ba07b637cedf206fec0d3b0cf92141700a23cIrfan Sheriff for (String key : txtMap.keySet()) { 100527ba07b637cedf206fec0d3b0cf92141700a23cIrfan Sheriff txtRecord.set(key, txtMap.get(key)); 101527ba07b637cedf206fec0d3b0cf92141700a23cIrfan Sheriff } 10221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 10321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 10421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff ArrayList<String> queries = new ArrayList<String>(); 1058bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff queries.add(createPtrServiceQuery(instanceName, serviceType)); 1068bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff queries.add(createTxtServiceQuery(instanceName, serviceType, txtRecord)); 10721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 1088bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff return new WifiP2pDnsSdServiceInfo(queries); 10921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 11021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 11121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 11221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Create wpa_supplicant service query for PTR record. 11321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 11421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param instanceName instance name.<br> 11521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * e.g) "MyPrinter" 1168bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * @param serviceType service type.<br> 1178bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * e.g) "_ipp._tcp" 11821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @return wpa_supplicant service query. 11921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 12021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff private static String createPtrServiceQuery(String instanceName, 1218bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff String serviceType) { 12221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 12321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff StringBuffer sb = new StringBuffer(); 12421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append("bonjour "); 1258bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff sb.append(createRequest(serviceType + ".local.", DNS_TYPE_PTR, VERSION_1)); 12621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(" "); 12721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 12821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff byte[] data = instanceName.getBytes(); 12921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(String.format("%02x", data.length)); 13021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(WifiP2pServiceInfo.bin2HexStr(data)); 13121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff // This is the start point of this response. 13221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff // Therefore, it indicates the request domain name. 13321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append("c027"); 13421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff return sb.toString(); 13521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 13621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 13721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 13821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Create wpa_supplicant service query for TXT record. 13921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 14021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param instanceName instance name.<br> 14121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * e.g) "MyPrinter" 1428bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * @param serviceType service type.<br> 1438bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * e.g) "_ipp._tcp" 14421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param txtRecord TXT record.<br> 14521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @return wpa_supplicant service query. 14621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 1478bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff private static String createTxtServiceQuery(String instanceName, 1488bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff String serviceType, 14921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff DnsSdTxtRecord txtRecord) { 15021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 15121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 15221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff StringBuffer sb = new StringBuffer(); 15321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append("bonjour "); 15421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 1558bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff sb.append(createRequest((instanceName + "." + serviceType + ".local."), 15621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff DNS_TYPE_TXT, VERSION_1)); 15721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(" "); 15821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff byte[] rawData = txtRecord.getRawData(); 15921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff if (rawData.length == 0) { 16021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append("00"); 16121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } else { 16221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(bin2HexStr(rawData)); 16321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 16421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff return sb.toString(); 16521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 16621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 16721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 16821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Create bonjour service discovery request. 16921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 17021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param dnsName dns name 17121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param dnsType dns type 17221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param version version number 17321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @hide 17421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 17521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff static String createRequest(String dnsName, int dnsType, int version) { 17621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff StringBuffer sb = new StringBuffer(); 17721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 17821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /* 17921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * The request format is as follows. 18021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * ________________________________________________ 18121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * | Encoded and Compressed dns name (variable) | 18221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * ________________________________________________ 18321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * | Type (2) | Version (1) | 18421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 1858bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff if (dnsType == WifiP2pDnsSdServiceInfo.DNS_TYPE_TXT) { 18621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff dnsName = dnsName.toLowerCase(); 18721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 18821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(compressDnsName(dnsName)); 18921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(String.format("%04x", dnsType)); 19021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(String.format("%02x", version)); 19121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 19221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff return sb.toString(); 19321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 19421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 19521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 19621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Compress DNS data. 19721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 19821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * see E.3 of the Wi-Fi Direct technical specification for the detail. 19921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 20021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param dnsName dns name 20121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @return compressed dns name 20221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 20321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff private static String compressDnsName(String dnsName) { 20421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff StringBuffer sb = new StringBuffer(); 20521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 20621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff // The domain name is replaced with a pointer to a prior 20721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff // occurrence of the same name in virtual memory packet. 20821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff while (true) { 20921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff String data = sVmPacket.get(dnsName); 21021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff if (data != null) { 21121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(data); 21221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff break; 21321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 21421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff int i = dnsName.indexOf('.'); 21521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff if (i == -1) { 21621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff if (dnsName.length() > 0) { 21721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(String.format("%02x", dnsName.length())); 21821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(WifiP2pServiceInfo.bin2HexStr(dnsName.getBytes())); 21921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 22021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff // for a sequence of labels ending in a zero octet 22121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append("00"); 22221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff break; 22321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 22421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 22521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff String name = dnsName.substring(0, i); 22621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff dnsName = dnsName.substring(i + 1); 22721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(String.format("%02x", name.length())); 22821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(WifiP2pServiceInfo.bin2HexStr(name.getBytes())); 22921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 23021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff return sb.toString(); 23121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 23221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff} 233