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Address.java
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 1999-2004 Brian Wellington (bwelling@xbill.org)
package org.xbill.DNS;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.UnknownHostException;
import lombok.experimental.UtilityClass;
/**
* Routines dealing with IP addresses. Includes functions similar to those in the
* java.net.InetAddress class.
*
* @author Brian Wellington
*/
@UtilityClass
public final class Address {
public static final int IPv4 = 1;
public static final int IPv6 = 2;
/**
* Convert a string containing an IP address to an array of 4 or 16 integers.
*
* @param s The address, in text format.
* @param family The address family.
* @return The address
*/
public static int[] toArray(String s, int family) {
byte[] byteArray = toByteArray(s, family);
if (byteArray == null) {
return null;
}
int[] intArray = new int[byteArray.length];
for (int i = 0; i < byteArray.length; i++) {
intArray[i] = byteArray[i] & 0xFF;
}
return intArray;
}
/**
* Convert a string containing an IPv4 address to an array of 4 integers.
*
* @param s The address, in text format.
* @return The address
*/
public static int[] toArray(String s) {
return toArray(s, IPv4);
}
/**
* Convert a string containing an IP address to an array of 4 or 16 bytes.
*
* @param s The address, in text format.
* @param family The address family.
* @return The address
*/
public static byte[] toByteArray(String s, int family) {
if (family == IPv4) {
return IPAddressUtils.parseV4(s);
} else if (family == IPv6) {
return IPAddressUtils.parseV6(s);
} else {
throw new IllegalArgumentException("unknown address family");
}
}
/**
* Determines if a string contains a valid IP address.
*
* @param s The string
* @return Whether the string contains a valid IP address
*/
public static boolean isDottedQuad(String s) {
byte[] address = Address.toByteArray(s, IPv4);
return address != null;
}
/**
* Converts a byte array containing an IPv4 address into a dotted quad string.
*
* @param addr The array
* @return The string representation
*/
public static String toDottedQuad(byte[] addr) {
return (addr[0] & 0xFF)
+ "."
+ (addr[1] & 0xFF)
+ "."
+ (addr[2] & 0xFF)
+ "."
+ (addr[3] & 0xFF);
}
/**
* Converts an int array containing an IPv4 address into a dotted quad string.
*
* @param addr The array
* @return The string representation
*/
public static String toDottedQuad(int[] addr) {
return addr[0] + "." + addr[1] + "." + addr[2] + "." + addr[3];
}
private static Record[] lookupHostName(String name, boolean all) throws UnknownHostException {
try {
Lookup lookup = new Lookup(name, Type.A);
Record[] a = lookup.run();
if (a == null) {
if (lookup.getResult() == Lookup.TYPE_NOT_FOUND) {
Record[] aaaa = new Lookup(name, Type.AAAA).run();
if (aaaa != null) {
return aaaa;
}
}
throw new UnknownHostException(
"<" + name + "> could not be resolved: " + lookup.getErrorString());
}
if (!all) {
return a;
}
Record[] aaaa = new Lookup(name, Type.AAAA).run();
if (aaaa == null) {
return a;
}
Record[] merged = new Record[a.length + aaaa.length];
System.arraycopy(a, 0, merged, 0, a.length);
System.arraycopy(aaaa, 0, merged, a.length, aaaa.length);
return merged;
} catch (TextParseException e) {
throw new UnknownHostException("<" + name + "> is invalid: " + e.getMessage());
}
}
private static InetAddress addrFromRecord(String name, Record r) throws UnknownHostException {
InetAddress addr;
if (r instanceof ARecord) {
addr = ((ARecord) r).getAddress();
} else {
addr = ((AAAARecord) r).getAddress();
}
return InetAddress.getByAddress(name, addr.getAddress());
}
/**
* Determines the IP address of a host
*
* @param name The hostname to look up
* @return The first matching IP address
* @exception UnknownHostException The hostname does not have any addresses
*/
public static InetAddress getByName(String name) throws UnknownHostException {
try {
return getByAddress(name);
} catch (UnknownHostException e) {
Record[] records = lookupHostName(name, false);
return addrFromRecord(name, records[0]);
}
}
/**
* Determines all IP address of a host
*
* @param name The hostname to look up
* @return All matching IP addresses
* @exception UnknownHostException The hostname does not have any addresses
*/
public static InetAddress[] getAllByName(String name) throws UnknownHostException {
try {
InetAddress addr = getByAddress(name);
return new InetAddress[] {addr};
} catch (UnknownHostException e) {
Record[] records = lookupHostName(name, true);
InetAddress[] addrs = new InetAddress[records.length];
for (int i = 0; i < records.length; i++) {
addrs[i] = addrFromRecord(name, records[i]);
}
return addrs;
}
}
/**
* Converts an address from its string representation to an IP address. The address can be either
* IPv4 or IPv6.
*
* @param addr The address, in string form
* @return The IP addresses
* @exception UnknownHostException The address is not a valid IP address.
*/
public static InetAddress getByAddress(String addr) throws UnknownHostException {
byte[] bytes;
bytes = toByteArray(addr, IPv4);
if (bytes != null) {
return InetAddress.getByAddress(addr, bytes);
}
bytes = toByteArray(addr, IPv6);
if (bytes != null) {
return InetAddress.getByAddress(addr, bytes);
}
throw new UnknownHostException("Invalid address: " + addr);
}
/**
* Converts an address from its string representation to an IP address in a particular family.
*
* @param addr The address, in string form
* @param family The address family, either IPv4 or IPv6.
* @return The IP addresses
* @exception UnknownHostException The address is not a valid IP address in the specified address
* family.
*/
public static InetAddress getByAddress(String addr, int family) throws UnknownHostException {
if (family != IPv4 && family != IPv6) {
throw new IllegalArgumentException("unknown address family");
}
byte[] bytes;
bytes = toByteArray(addr, family);
if (bytes != null) {
return InetAddress.getByAddress(addr, bytes);
}
throw new UnknownHostException("Invalid address: " + addr);
}
/**
* Determines the hostname for an address
*
* @param addr The address to look up
* @return The associated host name
* @exception UnknownHostException There is no hostname for the address
*/
public static String getHostName(InetAddress addr) throws UnknownHostException {
Name name = ReverseMap.fromAddress(addr);
Record[] records = new Lookup(name, Type.PTR).run();
if (records == null) {
throw new UnknownHostException("unknown address: " + name);
}
PTRRecord ptr = (PTRRecord) records[0];
return ptr.getTarget().toString();
}
/**
* Returns the family of an InetAddress.
*
* @param address The supplied address.
* @return The family, either IPv4 or IPv6.
*/
public static int familyOf(InetAddress address) {
if (address instanceof Inet4Address) {
return IPv4;
}
if (address instanceof Inet6Address) {
return IPv6;
}
throw new IllegalArgumentException("unknown address family");
}
/**
* Returns the length of an address in a particular family.
*
* @param family The address family, either IPv4 or IPv6.
* @return The length of addresses in that family.
*/
public static int addressLength(int family) {
if (family == IPv4) {
return 4;
}
if (family == IPv6) {
return 16;
}
throw new IllegalArgumentException("unknown address family");
}
/**
* Truncates an address to the specified number of bits. For example, truncating the address
* 10.1.2.3 to 8 bits would yield 10.0.0.0.
*
* @param address The source address
* @param maskLength The number of bits to truncate the address to.
*/
public static InetAddress truncate(InetAddress address, int maskLength) {
int family = familyOf(address);
int maxMaskLength = addressLength(family) * 8;
if (maskLength < 0 || maskLength > maxMaskLength) {
throw new IllegalArgumentException("invalid mask length");
}
if (maskLength == maxMaskLength) {
return address;
}
byte[] bytes = address.getAddress();
for (int i = maskLength / 8 + 1; i < bytes.length; i++) {
bytes[i] = 0;
}
int maskBits = maskLength % 8;
int bitmask = 0;
for (int i = 0; i < maskBits; i++) {
bitmask |= 1 << (7 - i);
}
bytes[maskLength / 8] &= (byte) bitmask;
try {
return InetAddress.getByAddress(bytes);
} catch (UnknownHostException e) {
throw new IllegalArgumentException("invalid address");
}
}
}