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//
// Copyright 2017 Filippo "Fil" Bergamo <fil.bergamo@riseup.net>
//
// This file is part of RepWifiApp.
//
// RepWifiApp is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// RepWifiApp is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with RepWifiApp. If not, see <http://www.gnu.org/licenses/>.
//
// ********************************************************************
package fil.libre.repwifiapp.helpers;
import org.apache.http.conn.util.InetAddressUtils;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.Serializable;
import android.nfc.FormatException;
public class DhcpSettings implements Serializable {
private static final long serialVersionUID = 1L;
public boolean useDhcp;
private String _staticIP;
private int _mask;
private String _defGw;
private static final String JSONKEY_DHCP = "DHCP";
private static final String JSONKEY_STATIC_IP = "StaticIP";
private static final String JSONKEY_GW = "Gateway";
public DhcpSettings(boolean useDhcp, String staticIP, String subnetMask, String defaultGateway)
throws FormatException {
this(useDhcp, staticIP, Utils.netmaskStringToInt(subnetMask), defaultGateway);
}
public DhcpSettings(boolean useDhcp, String staticIP, int subnetMask, String defaultGatweay)
throws FormatException {
this.useDhcp = useDhcp;
if (!useDhcp) {
if (!validateParams(staticIP, defaultGatweay, subnetMask)) {
throw new FormatException("Invalid dhcp parameters!");
}
this._staticIP = staticIP;
this._mask = subnetMask;
this._defGw = defaultGatweay;
}
}
private DhcpSettings(){
// inner use
}
public static DhcpSettings parseSavedSettings(String staticIPwithMask, String defaultGateway){
try {
String[] ipm = staticIPwithMask.split("/");
String ip = ipm[0];
int mask = Integer.parseInt(ipm[1]);
return new DhcpSettings(false, ip, mask, defaultGateway);
} catch (Exception e) {
Utils.logError("Exception while parsing DhcpSettings for saved network. Reverting to dhcp.", e);
return null;
}
}
public static DhcpSettings getDefault(){
try {
return new DhcpSettings(true, null, 24, null);
} catch (FormatException e) {
//no format exception can happen.
return null;
}
}
private boolean validateParams(String ip, String gateway, int mask) {
if (isValidAddress(ip) && isValidAddress(gateway) && isValidMask(mask)) {
return true;
} else {
return false;
}
}
public static boolean isValidAddress(String ipAddress){
return InetAddressUtils.isIPv4Address(ipAddress);
}
public static boolean isValidMaks(String mask){
int m = Utils.netmaskStringToInt(mask);
return isValidMask(m);
}
public static boolean isValidMask(int mask){
if (mask >= 8 && mask <= 32){
return true;
}else{
return false;
}
}
public String getStaticIP() {
if (_staticIP == null){
return "";
}
return _staticIP;
}
public String getStaticIPwithMask() {
return getStaticIP() + "/" + String.valueOf(getSubnetMaskInt());
}
public int getSubnetMaskInt() {
return _mask;
}
public String getSubnetMaskString(){
String v = Utils.netmaskIntToString(_mask);
if (v == null){
return "";
}
return v;
}
public String getDefaultGateway() {
if (_defGw == null){
return "";
}
return _defGw;
}
public JSONObject toJson(){
JSONObject j = new JSONObject();
try {
j.put(JSONKEY_DHCP, useDhcp);
j.put(JSONKEY_GW, getDefaultGateway());
j.put(JSONKEY_STATIC_IP, getStaticIPwithMask());
return j;
} catch (JSONException e) {
Utils.logError("Exception while converting DhcpSettings to JSON.", e);
return null;
}
}
public static DhcpSettings fromJsonObject(JSONObject json){
if (json == null){
return null;
}
DhcpSettings sets = new DhcpSettings();
try {
sets.useDhcp = json.getBoolean(JSONKEY_DHCP);
if (json.has(JSONKEY_GW) && ! json.isNull(JSONKEY_GW)){
sets._defGw = json.getString(JSONKEY_GW);
}
if (json.has(JSONKEY_STATIC_IP) && !json.isNull(JSONKEY_STATIC_IP)){
String[] splt = json.getString(JSONKEY_STATIC_IP).split("/");
sets._staticIP = splt[0];
sets._mask = Integer.parseInt(splt[1]);
}
return sets;
} catch (Exception e) {
Utils.logError("Exception while parsing json object to DhcpSettings", e);
return null;
}
}
}
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