Android防火墙+流量统计代码

首届 Google 暑期大学生博客分享大赛——2010 Andriod 篇

BroadcastReceiver模块

用于监听开机信息 并初始化和启动服务

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package zy.dnh;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class getpowerinfo extends BroadcastReceiver{
FileOutputStream out;
final public String ONPATH = "/data/data/zy.dnh/on.txt";
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub

if(intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)){
Intent bootActivityIntent=new Intent(context,mService1.class);//启动服务
bootActivityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
writefile("0,0,0,0,0,0,0,0,0,0,0,0",ONPATH);
context.startService(bootActivityIntent);
Toast.makeText(context, "Netcounter service has been lauched", Toast.LENGTH_LONG).show();
Api.applySavedIptablesRules(context, false);//应用防火墙规则
Toast.makeText(context, "Wall rules have been lauched", Toast.LENGTH_LONG).show();
}
}
public void writefile(String str,String path )
{
File file;
try {
//创建文件
file = new File(path);
file.createNewFile();

//打开文件file的OutputStream
out = new FileOutputStream(file);
String infoToWrite = str;
//将字符串转换成byte数组写入文件
out.write(infoToWrite.getBytes());
//关闭文件file的OutputStream
out.close();



} catch (IOException e) {
//将出错信息打印到Logcat


}
package zy.dnh;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class getpowerinfo extends BroadcastReceiver{
FileOutputStream out;
final public String ONPATH = "/data/data/zy.dnh/on.txt";
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub

if(intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)){
Intent bootActivityIntent=new Intent(context,mService1.class);//启动服务
bootActivityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
writefile("0,0,0,0,0,0,0,0,0,0,0,0",ONPATH);
context.startService(bootActivityIntent);
Toast.makeText(context, "Netcounter service has been lauched", Toast.LENGTH_LONG).show();
Api.applySavedIptablesRules(context, false);//应用防火墙规则
Toast.makeText(context, "Wall rules have been lauched", Toast.LENGTH_LONG).show();
}
}
public void writefile(String str,String path )
{
File file;
try {
//创建文件
file = new File(path);
file.createNewFile();

//打开文件file的OutputStream
out = new FileOutputStream(file);
String infoToWrite = str;
//将字符串转换成byte数组写入文件
out.write(infoToWrite.getBytes());
//关闭文件file的OutputStream
out.close();



} catch (IOException e) {
//将出错信息打印到Logcat


}

mService1模块

后台服务，用于维护流量日志

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public class mService1 extends Service
{


private Handler objHandler = new Handler();
private int intCounter=0;
private int mHour;
private int mMinute;
private int mYear;
private int mMonth;
private int mDay;
private String mdate;


final public String DEV_FILE = "/proc/self/net/dev";//系统流量文件
String[] ethdata={"0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0"};
String[] gprsdata={"0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0"};
String[] wifidata={"0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0"};
String data="0,0,0,0,0,0,0,0,0,0,0,0";//对应on.txt里面的格式
final String ETHLINE=" eth0";//以太网信息所在行
final String GPRSLINE="rmnet0";
final String WIFILINE="tiwlan0";

final String TEXT_ENCODING = "UTF-8";

final public String ONPATH = "/data/data/zy.dnh/on.txt";
final public String LOGPATH = "/data/data/zy.dnh/log.txt";

private Runnable mTasks = new Runnable()
{

public void run()//运行该服务执行此函数
{
refresh();


intCounter++;
// DisplayToast("Counter:"+Integer.toString(intCounter));
objHandler.postDelayed(mTasks, 30000);//每3000毫秒执行一次
}
};

@Override
public void onStart(Intent intent, int startId)
{
// TODO Auto-generated method stub
//writefile("0,0,0,0,0,0,0,0,0,0,0,0",ONPATH);//每次启动服务 初始化onpath

objHandler.postDelayed(mTasks, 0);
super.onStart(intent, startId);
}
@Override
public void onCreate()
{
// TODO Auto-generated method stub

super.onCreate();
}

@Override
public IBinder onBind(Intent intent)
{
// TODO Auto-generated method stub


return null;
}
@Override
public void onDestroy()
{
// TODO Auto-generated method stub

/* */
objHandler.removeCallbacks(mTasks);
super.onDestroy();
}
public void DisplayToast(String str)
{
Toast.makeText(this,str,Toast.LENGTH_SHORT).show();
}
public void readdev()
{
FileReader fstream = null;
try {
fstream = new FileReader(DEV_FILE);

}
catch (FileNotFoundException e) {
DisplayToast("Could not read " + DEV_FILE);

}
BufferedReader in = new BufferedReader(fstream, 500);
String line;
String[] segs;
String[] netdata;

int count=0;
int k;
int j;
try {
while ((line = in.readLine()) != null) {
segs = line.trim().split(":");
if(line.startsWith(ETHLINE))
{

netdata=segs[1].trim().split(" ");
for(k=0,j=0;k<netdata.length;k++)
{
if(netdata[k].length()>0)
{

ethdata[j]=netdata[k];
j++;
}
}
}
else if(line.startsWith(GPRSLINE))
{

netdata=segs[1].trim().split(" ");
for(k=0,j=0;k<netdata.length;k++)
{
if(netdata[k].length()>0)
{

gprsdata[j]=netdata[k];
j++;
}
}
}
else if(line.startsWith(WIFILINE))
{

netdata=segs[1].trim().split(" ");
for(k=0,j=0;k<netdata.length;k++)
{
if(netdata[k].length()>0)
{

wifidata[j]=netdata[k];
j++;
}
}
}




count++;
}
fstream.close();

}
catch (IOException e) {
DisplayToast(e.toString());
}
}
public String getinfo(String path)
{
File file;
String str="";
FileInputStream in;
try{
//打开文件file的InputStream
file = new File(path);
in = new FileInputStream(file);
//将文件内容全部读入到byte数组
int length = (int)file.length();
byte[] temp = new byte[length];
in.read(temp, 0, length);
//将byte数组用UTF-8编码并存入display字符串中
str = EncodingUtils.getString(temp,TEXT_ENCODING);
//关闭文件file的InputStream
in.close();
}
catch (IOException e) {

DisplayToast(e.toString());

}
return str;
}
public void writefile(String str,String path )
{
File file;
FileOutputStream out;
try {
//创建文件
file = new File(path);
file.createNewFile();
//打开文件file的OutputStream
out = new FileOutputStream(file);
String infoToWrite = str;
//将字符串转换成byte数组写入文件
out.write(infoToWrite.getBytes());
//关闭文件file的OutputStream
out.close();
} catch (IOException e) {
//将出错信息打印到Logcat
DisplayToast(e.toString());

}
}
public void refresh()
{


readdev();//读取本次开机之后直到当前系统的总流量

data=ethdata[0]+","+ethdata[1]+","+ethdata[8]+","+ethdata[9]+","
+gprsdata[0]+","+gprsdata[1]+","+gprsdata[8]+","+gprsdata[9]+","
+wifidata[0]+","+wifidata[1]+","+wifidata[8]+","+wifidata[9];
String onstr=getinfo(ONPATH);//读取on.txt记录到onstr里
String ondata[]=onstr.split(",");//将onstr各项分离 放到ondata里
//计算增量
int [] delta=new int [12];

delta[0]=Integer.parseInt(ethdata[0])-Integer.parseInt(ondata[0]);
delta[1]=Integer.parseInt(ethdata[1])-Integer.parseInt(ondata[1]);
delta[2]=Integer.parseInt(ethdata[8])-Integer.parseInt(ondata[2]);
delta[3]=Integer.parseInt(ethdata[9])-Integer.parseInt(ondata[3]);
delta[4]=Integer.parseInt(gprsdata[0])-Integer.parseInt(ondata[4]);
delta[5]=Integer.parseInt(gprsdata[1])-Integer.parseInt(ondata[5]);
delta[6]=Integer.parseInt(gprsdata[8])-Integer.parseInt(ondata[6]);
delta[7]=Integer.parseInt(gprsdata[9])-Integer.parseInt(ondata[7]);
delta[8]=Integer.parseInt(wifidata[0])-Integer.parseInt(ondata[8]);
delta[9]=Integer.parseInt(wifidata[1])-Integer.parseInt(ondata[9]);
delta[10]=Integer.parseInt(wifidata[8])-Integer.parseInt(ondata[10]);
delta[11]=Integer.parseInt(wifidata[9])-Integer.parseInt(ondata[11]);


//读取log.txt
//获取当前时间
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR); //获取当前年份
mMonth = c.get(Calendar.MONTH)+1;//获取当前月份
mDay = c.get(Calendar.DAY_OF_MONTH);//获取当前月份的日期号码
mHour = c.get(Calendar.HOUR_OF_DAY);//获取当前的小时数
mMinute = c.get(Calendar.MINUTE);//获取当前的分钟数
mdate=mYear+"-"+mMonth+"-"+mDay;

String text=getinfo(LOGPATH);//将log.txt的内容读到text字符串中
String [] line=text.split("/n");

String today=line[line.length-1];//获得今日已记录流量
String [] beToday=today.split(",");
//检查文件最后一行是否为今天的流量记录信息
if(!beToday[0].equals(mdate))//
//判断今日流量是否已经记录,如果今日流量没有记录
{

text=text+mdate+",0,0,0,0,0,0,0,0,0,0,0,0/n";
writefile(text,LOGPATH);


line=text.split("/n");
today=line[line.length-1];//获得今日已记录流量

beToday=today.split(",");
}
int i;
//处理今日流量
int [] newTodaydata=new int [12];//表示今日流量
String newtoday=mdate;
for(i=0;i<=11;i++)//更新今日流量
{
newTodaydata[i]=Integer.parseInt(beToday[i+1])+delta[i];
newtoday=newtoday+","+newTodaydata[i];
}
newtoday=newtoday+"/n";


String [] beTotal=line[0].split(",");
int [] newTotaldata=new int [12];//表示总流量数值
//更新第一行
String newtotal="total";
for(i=0;i<=11;i++)//更新今日流量和总流量
{
newTotaldata[i]=Integer.parseInt(beTotal[i+1])+delta[i];//总流量数值+delta[i]更新
newtotal=newtotal+","+newTotaldata[i];
}
newtotal= newtotal+"/n";
//处理中间不变的部分
String before="";//before为之前的从第1行到昨天的流量记录

for(i=1;i<=line.length-2;i++)
before=before+line[i]+"/n";//代表中间不变的部分

String newlog=newtotal+before+newtoday;
writefile(data,ONPATH);//更新流量记录
writefile(newlog,LOGPATH);//更新log*/



}


}
public class mService1 extends Service
{


private Handler objHandler = new Handler();
private int intCounter=0;
private int mHour;
private int mMinute;
private int mYear;
private int mMonth;
private int mDay;
private String mdate;


final public String DEV_FILE = "/proc/self/net/dev";//系统流量文件
String[] ethdata={"0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0"};
String[] gprsdata={"0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0"};
String[] wifidata={"0","0","0","0","0","0","0","0","0","0","0","0","0","0","0","0"};
String data="0,0,0,0,0,0,0,0,0,0,0,0";//对应on.txt里面的格式
final String ETHLINE=" eth0";//以太网信息所在行
final String GPRSLINE="rmnet0";
final String WIFILINE="tiwlan0";

final String TEXT_ENCODING = "UTF-8";

final public String ONPATH = "/data/data/zy.dnh/on.txt";
final public String LOGPATH = "/data/data/zy.dnh/log.txt";

private Runnable mTasks = new Runnable()
{

public void run()//运行该服务执行此函数
{
refresh();


intCounter++;
// DisplayToast("Counter:"+Integer.toString(intCounter));
objHandler.postDelayed(mTasks, 30000);//每3000毫秒执行一次
}
};

@Override
public void onStart(Intent intent, int startId)
{
// TODO Auto-generated method stub
//writefile("0,0,0,0,0,0,0,0,0,0,0,0",ONPATH);//每次启动服务 初始化onpath

objHandler.postDelayed(mTasks, 0);
super.onStart(intent, startId);
}
@Override
public void onCreate()
{
// TODO Auto-generated method stub

super.onCreate();
}

@Override
public IBinder onBind(Intent intent)
{
// TODO Auto-generated method stub


return null;
}
@Override
public void onDestroy()
{
// TODO Auto-generated method stub

/* */
objHandler.removeCallbacks(mTasks);
super.onDestroy();
}
public void DisplayToast(String str)
{
Toast.makeText(this,str,Toast.LENGTH_SHORT).show();
}
public void readdev()
{
FileReader fstream = null;
try {
fstream = new FileReader(DEV_FILE);

}
catch (FileNotFoundException e) {
DisplayToast("Could not read " + DEV_FILE);

}
BufferedReader in = new BufferedReader(fstream, 500);
String line;
String[] segs;
String[] netdata;

int count=0;
int k;
int j;
try {
while ((line = in.readLine()) != null) {
segs = line.trim().split(":");
if(line.startsWith(ETHLINE))
{

netdata=segs[1].trim().split(" ");
for(k=0,j=0;k<netdata.length;k++)
{
if(netdata[k].length()>0)
{

ethdata[j]=netdata[k];
j++;
}
}
}
else if(line.startsWith(GPRSLINE))
{

netdata=segs[1].trim().split(" ");
for(k=0,j=0;k<netdata.length;k++)
{
if(netdata[k].length()>0)
{

gprsdata[j]=netdata[k];
j++;
}
}
}
else if(line.startsWith(WIFILINE))
{

netdata=segs[1].trim().split(" ");
for(k=0,j=0;k<netdata.length;k++)
{
if(netdata[k].length()>0)
{

wifidata[j]=netdata[k];
j++;
}
}
}




count++;
}
fstream.close();

}
catch (IOException e) {
DisplayToast(e.toString());
}
}
public String getinfo(String path)
{
File file;
String str="";
FileInputStream in;
try{
//打开文件file的InputStream
file = new File(path);
in = new FileInputStream(file);
//将文件内容全部读入到byte数组
int length = (int)file.length();
byte[] temp = new byte[length];
in.read(temp, 0, length);
//将byte数组用UTF-8编码并存入display字符串中
str = EncodingUtils.getString(temp,TEXT_ENCODING);
//关闭文件file的InputStream
in.close();
}
catch (IOException e) {

DisplayToast(e.toString());

}
return str;
}
public void writefile(String str,String path )
{
File file;
FileOutputStream out;
try {
//创建文件
file = new File(path);
file.createNewFile();
//打开文件file的OutputStream
out = new FileOutputStream(file);
String infoToWrite = str;
//将字符串转换成byte数组写入文件
out.write(infoToWrite.getBytes());
//关闭文件file的OutputStream
out.close();
} catch (IOException e) {
//将出错信息打印到Logcat
DisplayToast(e.toString());

}
}
public void refresh()
{


readdev();//读取本次开机之后直到当前系统的总流量

data=ethdata[0]+","+ethdata[1]+","+ethdata[8]+","+ethdata[9]+","
+gprsdata[0]+","+gprsdata[1]+","+gprsdata[8]+","+gprsdata[9]+","
+wifidata[0]+","+wifidata[1]+","+wifidata[8]+","+wifidata[9];
String onstr=getinfo(ONPATH);//读取on.txt记录到onstr里
String ondata[]=onstr.split(",");//将onstr各项分离 放到ondata里
//计算增量
int [] delta=new int [12];

delta[0]=Integer.parseInt(ethdata[0])-Integer.parseInt(ondata[0]);
delta[1]=Integer.parseInt(ethdata[1])-Integer.parseInt(ondata[1]);
delta[2]=Integer.parseInt(ethdata[8])-Integer.parseInt(ondata[2]);
delta[3]=Integer.parseInt(ethdata[9])-Integer.parseInt(ondata[3]);
delta[4]=Integer.parseInt(gprsdata[0])-Integer.parseInt(ondata[4]);
delta[5]=Integer.parseInt(gprsdata[1])-Integer.parseInt(ondata[5]);
delta[6]=Integer.parseInt(gprsdata[8])-Integer.parseInt(ondata[6]);
delta[7]=Integer.parseInt(gprsdata[9])-Integer.parseInt(ondata[7]);
delta[8]=Integer.parseInt(wifidata[0])-Integer.parseInt(ondata[8]);
delta[9]=Integer.parseInt(wifidata[1])-Integer.parseInt(ondata[9]);
delta[10]=Integer.parseInt(wifidata[8])-Integer.parseInt(ondata[10]);
delta[11]=Integer.parseInt(wifidata[9])-Integer.parseInt(ondata[11]);


//读取log.txt
//获取当前时间
final Calendar c = Calendar.getInstance();
mYear = c.get(Calendar.YEAR); //获取当前年份
mMonth = c.get(Calendar.MONTH)+1;//获取当前月份
mDay = c.get(Calendar.DAY_OF_MONTH);//获取当前月份的日期号码
mHour = c.get(Calendar.HOUR_OF_DAY);//获取当前的小时数
mMinute = c.get(Calendar.MINUTE);//获取当前的分钟数
mdate=mYear+"-"+mMonth+"-"+mDay;

String text=getinfo(LOGPATH);//将log.txt的内容读到text字符串中
String [] line=text.split("/n");

String today=line[line.length-1];//获得今日已记录流量
String [] beToday=today.split(",");
//检查文件最后一行是否为今天的流量记录信息
if(!beToday[0].equals(mdate))//
//判断今日流量是否已经记录,如果今日流量没有记录
{

text=text+mdate+",0,0,0,0,0,0,0,0,0,0,0,0/n";
writefile(text,LOGPATH);


line=text.split("/n");
today=line[line.length-1];//获得今日已记录流量

beToday=today.split(",");
}
int i;
//处理今日流量
int [] newTodaydata=new int [12];//表示今日流量
String newtoday=mdate;
for(i=0;i<=11;i++)//更新今日流量
{
newTodaydata[i]=Integer.parseInt(beToday[i+1])+delta[i];
newtoday=newtoday+","+newTodaydata[i];
}
newtoday=newtoday+"/n";


String [] beTotal=line[0].split(",");
int [] newTotaldata=new int [12];//表示总流量数值
//更新第一行
String newtotal="total";
for(i=0;i<=11;i++)//更新今日流量和总流量
{
newTotaldata[i]=Integer.parseInt(beTotal[i+1])+delta[i];//总流量数值+delta[i]更新
newtotal=newtotal+","+newTotaldata[i];
}
newtotal= newtotal+"/n";
//处理中间不变的部分
String before="";//before为之前的从第1行到昨天的流量记录

for(i=1;i<=line.length-2;i++)
before=before+line[i]+"/n";//代表中间不变的部分

String newlog=newtotal+before+newtoday;
writefile(data,ONPATH);//更新流量记录
writefile(newlog,LOGPATH);//更新log*/



}


}

应用iptable规则模块，通过运行iptable脚本来实现iptable规则的应用

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private static boolean applyIptablesRulesImpl(Context ctx, List<Integer> uids, boolean showErrors) {
if (ctx == null) {
return false;
}
final SharedPreferences prefs = ctx.getSharedPreferences(PREFS_NAME, 0);
final boolean whitelist = prefs.getString(PREF_MODE, MODE_WHITELIST).equals(MODE_WHITELIST);
boolean wifi = false; // Wi-fi selected ?
final String itfs = prefs.getString(PREF_ITFS, ITF_3G);
String itfFilter;
if (itfs.indexOf("|") != -1) {
itfFilter = ""; // Block all interfaces
wifi = true;
} else if (itfs.indexOf(ITF_3G) != -1) {
itfFilter = "-o rmnet+";;
// Block all rmnet interfaces
} else {
itfFilter = "-o tiwlan+";;
// Block all tiwlan interfaces
wifi = true;
}
final StringBuilder script = new StringBuilder();
try {
int code;
script.append("iptables -F || exit/n");
final String targetRule = (whitelist ? "ACCEPT" : "REJECT");
if (whitelist && wifi) {
// When "white listing" Wi-fi, we need ensure that the dhcp and wifi users are allowed
int uid = android.os.Process.getUidForName("dhcp");
if (uid != -1) script.append("iptables -A OUTPUT "
+ itfFilter + " -m owner --uid-owner " + uid + " -j ACCEPT || exit/n");
uid = android.os.Process.getUidForName("wifi");
if (uid != -1) script.append("iptables -A OUTPUT " + itfFilter + " -m owner --uid-owner " + uid + " -j ACCEPT || exit/n"); }
for (Integer uid : uids) {
script.append("iptables -A OUTPUT " + itfFilter
+ " -m owner --uid-owner " + uid + " -j " + targetRule + " || exit/n");
}
if (whitelist) {
script.append("iptables -A OUTPUT " + itfFilter + " -j REJECT || exit/n");
}
StringBuilder res = new StringBuilder();
code = runScriptAsRoot(script.toString(), res);
if (showErrors && code != 0) {
String msg = res.toString();
Log.e("DroidWall", msg);
// Search for common error messages
if (msg.indexOf("Couldn't find match `owner'") != -1 || msg.indexOf("no chain/target match") != -1) {
alert(ctx, "Error applying iptables rules./nExit code: " + code + "/n/n" +"It seems your Linux kernel was not compiled with the netfilter /"owner/" module enabled, which is required for Droid Wall to work properly./n/n" +"You should check if there is an updated version of your Android ROM compiled with this kernel module.");
} else {
// Remove unnecessary help message from output
if (msg.indexOf("/nTry `iptables -h' or 'iptables --help' for more information.") != -1) {
msg = msg.replace("/nTry `iptables -h' or 'iptables --help' for more information.", "");
}
// Try `iptables -h' or 'iptables --help' for more information.
alert(ctx, "Error applying iptables rules. Exit code: " + code + "/n/n" + msg.trim());
}
} else {
return true;
}
} catch (Exception e) {
if (showErrors) alert(ctx, "error refreshing iptables: " + e);
}
return false;
}
private static boolean applyIptablesRulesImpl(Context ctx, List<Integer> uids, boolean showErrors) {
if (ctx == null) {
return false;
}
final SharedPreferences prefs = ctx.getSharedPreferences(PREFS_NAME, 0);
final boolean whitelist = prefs.getString(PREF_MODE, MODE_WHITELIST).equals(MODE_WHITELIST);
boolean wifi = false; // Wi-fi selected ?
final String itfs = prefs.getString(PREF_ITFS, ITF_3G);
String itfFilter;
if (itfs.indexOf("|") != -1) {
itfFilter = ""; // Block all interfaces
wifi = true;
} else if (itfs.indexOf(ITF_3G) != -1) {
itfFilter = "-o rmnet+";;
// Block all rmnet interfaces
} else {
itfFilter = "-o tiwlan+";;
// Block all tiwlan interfaces
wifi = true;
}
final StringBuilder script = new StringBuilder();
try {
int code;
script.append("iptables -F || exit/n");
final String targetRule = (whitelist ? "ACCEPT" : "REJECT");
if (whitelist && wifi) {
// When "white listing" Wi-fi, we need ensure that the dhcp and wifi users are allowed
int uid = android.os.Process.getUidForName("dhcp");
if (uid != -1) script.append("iptables -A OUTPUT "
+ itfFilter + " -m owner --uid-owner " + uid + " -j ACCEPT || exit/n");
uid = android.os.Process.getUidForName("wifi");
if (uid != -1) script.append("iptables -A OUTPUT " + itfFilter + " -m owner --uid-owner " + uid + " -j ACCEPT || exit/n"); }
for (Integer uid : uids) {
script.append("iptables -A OUTPUT " + itfFilter
+ " -m owner --uid-owner " + uid + " -j " + targetRule + " || exit/n");
}
if (whitelist) {
script.append("iptables -A OUTPUT " + itfFilter + " -j REJECT || exit/n");
}
StringBuilder res = new StringBuilder();
code = runScriptAsRoot(script.toString(), res);
if (showErrors && code != 0) {
String msg = res.toString();
Log.e("DroidWall", msg);
// Search for common error messages
if (msg.indexOf("Couldn't find match `owner'") != -1 || msg.indexOf("no chain/target match") != -1) {
alert(ctx, "Error applying iptables rules./nExit code: " + code + "/n/n" +"It seems your Linux kernel was not compiled with the netfilter /"owner/" module enabled, which is required for Droid Wall to work properly./n/n" +"You should check if there is an updated version of your Android ROM compiled with this kernel module.");
} else {
// Remove unnecessary help message from output
if (msg.indexOf("/nTry `iptables -h' or 'iptables --help' for more information.") != -1) {
msg = msg.replace("/nTry `iptables -h' or 'iptables --help' for more information.", "");
}
// Try `iptables -h' or 'iptables --help' for more information.
alert(ctx, "Error applying iptables rules. Exit code: " + code + "/n/n" + msg.trim());
}
} else {
return true;
}
} catch (Exception e) {
if (showErrors) alert(ctx, "error refreshing iptables: " + e);
}
return false;
}

本文来自CSDN博客，出处：http://blog.csdn.net/Zengyangtech/archive/2010/06/01/5638604.aspx