Add Hosts
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/*
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* Copyright 2018 Hippo Seven
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.hippo.ehviewer;
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/*
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* Created by Hippo on 2018/3/21.
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*/
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.Cursor;
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import android.database.sqlite.SQLiteDatabase;
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import android.database.sqlite.SQLiteOpenHelper;
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import android.support.annotation.Nullable;
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import android.util.Pair;
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import com.hippo.database.MSQLiteBuilder;
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import com.hippo.util.SqlUtils;
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import java.net.InetAddress;
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import java.net.UnknownHostException;
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import java.util.ArrayList;
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import java.util.List;
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public class Hosts {
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private static final int VERSION_1 = 1;
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private static final String TABLE_HOSTS = "HOSTS";
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private static final String COLUMN_HOST = "HOST";
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private static final String COLUMN_IP = "IP";
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private static final int DB_VERSION = VERSION_1;
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private final SQLiteOpenHelper helper;
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private final SQLiteDatabase db;
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public Hosts(Context context, String name) {
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helper = new MSQLiteBuilder()
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.version(VERSION_1)
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.createTable(TABLE_HOSTS)
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.insertColumn(TABLE_HOSTS, COLUMN_HOST, String.class)
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.insertColumn(TABLE_HOSTS, COLUMN_IP, String.class)
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.build(context, name, DB_VERSION);
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db = helper.getWritableDatabase();
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}
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/**
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* Gets a InetAddress with the host.
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*/
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@Nullable
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public InetAddress get(String host) {
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if (!isValidHost(host)) {
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return null;
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}
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Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_HOSTS + " WHERE " + COLUMN_HOST + " = ?;", new String[] {host});
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try {
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if (cursor.moveToNext()) {
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String ip = SqlUtils.getString(cursor, COLUMN_IP, null);
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return toInetAddress(host, ip);
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} else {
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return null;
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}
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} finally {
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cursor.close();
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}
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}
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private boolean contains(String host) {
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Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_HOSTS + " WHERE " + COLUMN_HOST + " = ?;", new String[] {host});
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try {
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return cursor.moveToNext();
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} finally {
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cursor.close();
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}
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}
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/**
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* Puts the host-ip pair into this hosts.
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*/
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public boolean put(String host, String ip) {
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if (!isValidHost(host) || !isValidIp(ip)) {
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return false;
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}
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ContentValues values = new ContentValues();
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values.put(COLUMN_HOST, host);
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values.put(COLUMN_IP, ip);
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if (contains(host)) {
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db.update(TABLE_HOSTS, values, COLUMN_HOST + " = ?", new String[] { host });
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} else {
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db.insert(TABLE_HOSTS, null, values);
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}
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return true;
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}
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/**
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* Puts delete the entry with the host.
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*/
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public void delete(String host) {
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db.delete(TABLE_HOSTS, COLUMN_HOST + " = ?", new String[] { host });
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}
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/**
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* Get all data from this host.
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*/
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public List<Pair<String, String>> getAll() {
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List<Pair<String, String>> result = new ArrayList<>();
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Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_HOSTS + ";", null);
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try {
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while (cursor.moveToNext()) {
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String host = SqlUtils.getString(cursor, COLUMN_HOST, null);
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String ip = SqlUtils.getString(cursor, COLUMN_IP, null);
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InetAddress inetAddress = toInetAddress(host, ip);
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if (inetAddress == null) {
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continue;
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}
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result.add(new Pair<>(host, ip));
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}
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} finally {
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cursor.close();
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}
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return result;
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}
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@Nullable
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private static InetAddress toInetAddress(String host, String ip) {
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if (!isValidHost(host)) {
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return null;
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}
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if (ip == null) {
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return null;
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}
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byte[] bytes = parseV4(ip);
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if (bytes == null) {
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bytes = parseV6(ip);
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}
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if (bytes == null) {
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return null;
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}
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try {
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return InetAddress.getByAddress(host, bytes);
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} catch (UnknownHostException e) {
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return null;
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}
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}
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/**
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* Returns true if the host is valid.
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*/
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public static boolean isValidHost(String host) {
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if (host == null) {
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return false;
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}
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if (host.length() > 253) {
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return false;
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}
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int labelLength = 0;
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for (int i = 0, n = host.length(); i < n; i++) {
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char ch = host.charAt(i);
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if (ch == '.') {
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if (labelLength < 1 || labelLength > 63) {
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return false;
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}
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labelLength = 0;
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} else {
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labelLength++;
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}
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if ((ch < 'a' || ch > 'z') && (ch < '0' || ch > '9') && ch != '-' && ch != '.') {
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return false;
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}
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}
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if (labelLength < 1 || labelLength > 63) {
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return false;
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}
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return true;
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}
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/**
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* Returns true if the ip is valid.
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*/
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public static boolean isValidIp(String ip) {
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return ip != null && (parseV4(ip) != null || parseV6(ip) != null);
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}
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// org.xbill.DNS.Address.parseV4
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@Nullable
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private static byte[] parseV4(String s) {
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int numDigits;
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int currentOctet;
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byte [] values = new byte[4];
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int currentValue;
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int length = s.length();
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currentOctet = 0;
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currentValue = 0;
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numDigits = 0;
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for (int i = 0; i < length; i++) {
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char c = s.charAt(i);
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if (c >= '0' && c <= '9') {
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/* Can't have more than 3 digits per octet. */
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if (numDigits == 3)
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return null;
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/* Octets shouldn't start with 0, unless they are 0. */
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if (numDigits > 0 && currentValue == 0)
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return null;
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numDigits++;
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currentValue *= 10;
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currentValue += (c - '0');
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/* 255 is the maximum value for an octet. */
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if (currentValue > 255)
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return null;
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} else if (c == '.') {
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/* Can't have more than 3 dots. */
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if (currentOctet == 3)
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return null;
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/* Two consecutive dots are bad. */
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if (numDigits == 0)
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return null;
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values[currentOctet++] = (byte) currentValue;
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currentValue = 0;
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numDigits = 0;
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} else
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return null;
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}
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/* Must have 4 octets. */
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if (currentOctet != 3)
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return null;
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/* The fourth octet can't be empty. */
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if (numDigits == 0)
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return null;
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values[currentOctet] = (byte) currentValue;
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return values;
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}
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// org.xbill.DNS.Address.parseV6
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@Nullable
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private static byte[] parseV6(String s) {
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int range = -1;
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byte [] data = new byte[16];
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String [] tokens = s.split(":", -1);
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int first = 0;
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int last = tokens.length - 1;
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if (tokens[0].length() == 0) {
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// If the first two tokens are empty, it means the string
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// started with ::, which is fine. If only the first is
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// empty, the string started with :, which is bad.
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if (last - first > 0 && tokens[1].length() == 0)
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first++;
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else
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return null;
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}
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if (tokens[last].length() == 0) {
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// If the last two tokens are empty, it means the string
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// ended with ::, which is fine. If only the last is
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// empty, the string ended with :, which is bad.
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if (last - first > 0 && tokens[last - 1].length() == 0)
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last--;
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else
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return null;
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}
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if (last - first + 1 > 8)
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return null;
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int i, j;
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for (i = first, j = 0; i <= last; i++) {
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if (tokens[i].length() == 0) {
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if (range >= 0)
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return null;
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range = j;
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continue;
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}
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if (tokens[i].indexOf('.') >= 0) {
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// An IPv4 address must be the last component
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if (i < last)
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return null;
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// There can't have been more than 6 components.
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if (i > 6)
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return null;
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byte [] v4addr = parseV4(tokens[i]);
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if (v4addr == null)
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return null;
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for (int k = 0; k < 4; k++)
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data[j++] = v4addr[k];
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break;
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}
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try {
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for (int k = 0; k < tokens[i].length(); k++) {
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char c = tokens[i].charAt(k);
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if (Character.digit(c, 16) < 0)
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return null;
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}
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int x = Integer.parseInt(tokens[i], 16);
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if (x > 0xFFFF || x < 0)
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return null;
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data[j++] = (byte)(x >>> 8);
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data[j++] = (byte)(x & 0xFF);
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}
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catch (NumberFormatException e) {
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return null;
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}
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}
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if (j < 16 && range < 0)
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return null;
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if (range >= 0) {
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int empty = 16 - j;
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System.arraycopy(data, range, data, range + empty, j - range);
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for (i = range; i < range + empty; i++)
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data[i] = 0;
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}
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return data;
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}
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}
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