// Copyright (c) 2003-2012, Jodd Team (jodd.org). All Rights Reserved.
package jodd.io;
import jodd.util.StringUtil;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.URL;
import java.net.UnknownHostException;
import java.nio.channels.Channels;
import java.nio.channels.ReadableByteChannel;
/**
* Network utilities.
*/
public class NetUtil {
public static final String LOCAL_HOST = "localhost";
public static final String LOCAL_IP = "127.0.0.1";
public static final String DEFAULT_MASK = "255.255.255.0";
public static final int INT_VALUE_127_0_0_1 = 0x7f000001;
/**
* Resolves IP address from a hostname.
*/
public static String resolveIpAddress(String hostname) {
try {
InetAddress netAddress;
if (hostname == null || hostname.equalsIgnoreCase(LOCAL_HOST)) {
netAddress = InetAddress.getLocalHost();
} else {
netAddress = Inet4Address.getByName(hostname);
}
return netAddress.getHostAddress();
} catch (UnknownHostException ignore) {
return null;
}
}
/**
* Returns IP address as integer.
*/
public static int getIpAsInt(String ipAddress) {
int ipIntValue = 0;
String tokens[] = StringUtil.splitc(ipAddress, '.');
for (String token : tokens) {
if (ipIntValue > 0) {
ipIntValue <<= 8;
}
ipIntValue += Integer.parseInt(token);
}
return ipIntValue;
}
public static int getMaskAsInt(String mask) {
if (!validateHostIp(mask)) {
mask = DEFAULT_MASK;
}
return getIpAsInt(mask);
}
public static boolean isSocketAccessAllowed(int localIp, int socketIp, int mask) {
boolean _retVal = false;
if (socketIp == INT_VALUE_127_0_0_1 || (localIp & mask) == (socketIp & mask)) {
_retVal = true;
}
return _retVal;
}
/**
* Validates IP address given as a string.
*/
public static boolean validateHostIp(String host) {
boolean retVal = false;
if (host == null) {
return retVal;
}
int hitDots = 0;
char data[] = host.toCharArray();
for (int i = 0; i < data.length; i++) {
char c = data[i];
int b = 0;
do {
if (c < '0' || c > '9') {
return false;
}
b = (b * 10 + c) - 48;
if (++i >= data.length) {
break;
}
c = data[i];
} while (c != '.');
if (b > 255) {
return false;
}
hitDots++;
}
return hitDots == 4;
}
/**
* Resolves host name from IP address bytes.
*/
public static String resolveHostName(byte[] ip) {
try {
InetAddress address = InetAddress.getByAddress(ip);
return address.getHostName();
} catch (UnknownHostException ignore) {
return null;
}
}
// ---------------------------------------------------------------- download
/**
* Downloads resource as byte array.
*/
public static byte[] downloadBytes(String url) throws IOException {
InputStream inputStream = new URL(url).openStream();
return StreamUtil.readBytes(inputStream);
}
/**
* Downloads resource as String.
*/
public static String downloadString(String url, String encoding) throws IOException {
InputStream inputStream = new URL(url).openStream();
return new String(StreamUtil.readChars(inputStream, encoding));
}
/**
* Downloads resource as String.
*/
public static String downloadString(String url) throws IOException {
InputStream inputStream = new URL(url).openStream();
return new String(StreamUtil.readChars(inputStream));
}
/**
* Downloads resource to a file, potentially very efficiently.
*/
public static void downloadFile(String url, File file) throws IOException {
InputStream inputStream = new URL(url).openStream();
ReadableByteChannel rbc = Channels.newChannel(inputStream);
FileOutputStream fos = new FileOutputStream(file);
fos.getChannel().transferFrom(rbc, 0, 1 << 24);
}
}
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