WifiP2pDnsSdServiceInfo.java revision 8bf825f48fde77cb2feb8720aac17093581bb085
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" 868bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * @param txtRecord TXT record as 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, 918bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff String serviceType, DnsSdTxtRecord txtRecord) { 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 9721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff if (txtRecord == null) { 9821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff txtRecord = new DnsSdTxtRecord(); 9921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 10021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 10121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff ArrayList<String> queries = new ArrayList<String>(); 1028bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff queries.add(createPtrServiceQuery(instanceName, serviceType)); 1038bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff queries.add(createTxtServiceQuery(instanceName, serviceType, txtRecord)); 10421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 1058bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff return new WifiP2pDnsSdServiceInfo(queries); 10621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 10721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 10821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 10921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Create wpa_supplicant service query for PTR record. 11021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 11121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param instanceName instance name.<br> 11221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * e.g) "MyPrinter" 1138bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * @param serviceType service type.<br> 1148bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * e.g) "_ipp._tcp" 11521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @return wpa_supplicant service query. 11621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 11721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff private static String createPtrServiceQuery(String instanceName, 1188bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff String serviceType) { 11921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 12021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff StringBuffer sb = new StringBuffer(); 12121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append("bonjour "); 1228bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff sb.append(createRequest(serviceType + ".local.", DNS_TYPE_PTR, VERSION_1)); 12321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(" "); 12421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 12521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff byte[] data = instanceName.getBytes(); 12621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(String.format("%02x", data.length)); 12721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(WifiP2pServiceInfo.bin2HexStr(data)); 12821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff // This is the start point of this response. 12921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff // Therefore, it indicates the request domain name. 13021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append("c027"); 13121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff return sb.toString(); 13221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 13321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 13421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 13521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Create wpa_supplicant service query for TXT record. 13621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 13721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param instanceName instance name.<br> 13821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * e.g) "MyPrinter" 1398bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * @param serviceType service type.<br> 1408bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff * e.g) "_ipp._tcp" 14121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param txtRecord TXT record.<br> 14221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @return wpa_supplicant service query. 14321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 1448bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff private static String createTxtServiceQuery(String instanceName, 1458bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff String serviceType, 14621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff DnsSdTxtRecord txtRecord) { 14721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 14821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 14921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff StringBuffer sb = new StringBuffer(); 15021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append("bonjour "); 15121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 1528bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff sb.append(createRequest((instanceName + "." + serviceType + ".local."), 15321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff DNS_TYPE_TXT, VERSION_1)); 15421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(" "); 15521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff byte[] rawData = txtRecord.getRawData(); 15621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff if (rawData.length == 0) { 15721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append("00"); 15821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } else { 15921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(bin2HexStr(rawData)); 16021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 16121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff return sb.toString(); 16221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 16321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 16421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 16521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Create bonjour service discovery request. 16621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 16721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param dnsName dns name 16821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param dnsType dns type 16921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param version version number 17021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @hide 17121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 17221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff static String createRequest(String dnsName, int dnsType, int version) { 17321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff StringBuffer sb = new StringBuffer(); 17421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 17521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /* 17621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * The request format is as follows. 17721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * ________________________________________________ 17821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * | Encoded and Compressed dns name (variable) | 17921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * ________________________________________________ 18021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * | Type (2) | Version (1) | 18121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 1828bf825f48fde77cb2feb8720aac17093581bb085Irfan Sheriff if (dnsType == WifiP2pDnsSdServiceInfo.DNS_TYPE_TXT) { 18321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff dnsName = dnsName.toLowerCase(); 18421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 18521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(compressDnsName(dnsName)); 18621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(String.format("%04x", dnsType)); 18721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(String.format("%02x", version)); 18821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 18921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff return sb.toString(); 19021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 19121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 19221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff /** 19321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * Compress DNS data. 19421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 19521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * see E.3 of the Wi-Fi Direct technical specification for the detail. 19621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * 19721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @param dnsName dns name 19821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff * @return compressed dns name 19921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff */ 20021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff private static String compressDnsName(String dnsName) { 20121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff StringBuffer sb = new StringBuffer(); 20221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 20321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff // The domain name is replaced with a pointer to a prior 20421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff // occurrence of the same name in virtual memory packet. 20521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff while (true) { 20621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff String data = sVmPacket.get(dnsName); 20721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff if (data != null) { 20821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(data); 20921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff break; 21021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 21121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff int i = dnsName.indexOf('.'); 21221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff if (i == -1) { 21321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff if (dnsName.length() > 0) { 21421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(String.format("%02x", dnsName.length())); 21521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(WifiP2pServiceInfo.bin2HexStr(dnsName.getBytes())); 21621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 21721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff // for a sequence of labels ending in a zero octet 21821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append("00"); 21921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff break; 22021ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 22121ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff 22221ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff String name = dnsName.substring(0, i); 22321ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff dnsName = dnsName.substring(i + 1); 22421ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(String.format("%02x", name.length())); 22521ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff sb.append(WifiP2pServiceInfo.bin2HexStr(name.getBytes())); 22621ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 22721ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff return sb.toString(); 22821ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff } 22921ba8153325e010224c6bc75a0acdc98b6ca82e8Irfan Sheriff} 230