org.wildfly.common.net.Inet Maven / Gradle / Ivy
/*
* JBoss, Home of Professional Open Source.
* Copyright 2017 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.wildfly.common.net;
import static java.security.AccessController.doPrivileged;
import java.lang.reflect.Array;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.URI;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.security.PrivilegedAction;
import java.util.Enumeration;
import java.util.regex.Pattern;
import org.wildfly.common.Assert;
import org.wildfly.common._private.CommonMessages;
/**
* Utilities relating to Internet protocol (a.k.a. "INET" or "IP") address manipulation.
*
* @author David M. Lloyd
*/
public final class Inet {
private Inet() {}
/**
* The "any" address for IPv4.
*/
public static final Inet4Address INET4_ANY = getInet4Address(0, 0, 0, 0);
/**
* The traditional loopback address for IPv4.
*/
public static final Inet4Address INET4_LOOPBACK = getInet4Address(127, 0, 0, 1);
/**
* The broadcast-all address for IPv4.
*/
public static final Inet4Address INET4_BROADCAST = getInet4Address(255, 255, 255, 255);
/**
* The "any" address for IPv6.
*/
public static final Inet6Address INET6_ANY = getInet6Address(0, 0, 0, 0, 0, 0, 0, 0);
/**
* The loopback address for IPv6.
*/
public static final Inet6Address INET6_LOOPBACK = getInet6Address(0, 0, 0, 0, 0, 0, 0, 1);
/**
* Get the optimal string representation of an IP address. For IPv6 addresses, this representation will be
* more compact that the default.
*
* @param inetAddress the address (must not be {@code null})
* @return the string representation (not {@code null})
*/
public static String toOptimalString(InetAddress inetAddress) {
Assert.checkNotNullParam("inetAddress", inetAddress);
return inetAddress instanceof Inet6Address ? toOptimalStringV6(inetAddress.getAddress()) : inetAddress.getHostAddress();
}
/**
* Get the optimal string representation of the bytes of an IP address.
*
* @param addressBytes the address bytes (must not be {@code null})
* @return the string representation (not {@code null})
*/
public static String toOptimalString(byte[] addressBytes) {
Assert.checkNotNullParam("addressBytes", addressBytes);
if (addressBytes.length == 4) {
return (addressBytes[0] & 0xff) + "." + (addressBytes[1] & 0xff) + "." + (addressBytes[2] & 0xff) + "." + (addressBytes[3] & 0xff);
} else if (addressBytes.length == 16) {
return toOptimalStringV6(addressBytes);
} else {
throw CommonMessages.msg.invalidAddressBytes(addressBytes.length);
}
}
/**
* Get a string representation of the given address which is suitable for use as the host component of a URL.
*
* @param inetAddress the address (must not be {@code null})
* @param useHostNameIfPresent {@code true} to preserve the host name string in the address, {@code false} to always give
* an IP address string
* @return the string representation (not {@code null})
*/
public static String toURLString(InetAddress inetAddress, boolean useHostNameIfPresent) {
Assert.checkNotNullParam("inetAddress", inetAddress);
if (useHostNameIfPresent) {
final String hostName = getHostNameIfResolved(inetAddress);
if (hostName != null) {
if (inetAddress instanceof Inet6Address && isInet6Address(hostName)) {
return "[" + hostName + "]";
} else {
// return it even if it's an IP address or whatever
return hostName;
}
}
}
if (inetAddress instanceof Inet6Address) {
return "[" + toOptimalString(inetAddress) + "]";
} else {
return toOptimalString(inetAddress);
}
}
/**
* Get a string representation of the given address bytes which is suitable for use as the host component of a URL.
*
* @param addressBytes the address bytes (must not be {@code null})
* @return the string representation (not {@code null})
*/
public static String toURLString(byte[] addressBytes) {
Assert.checkNotNullParam("addressBytes", addressBytes);
if (addressBytes.length == 4) {
return (addressBytes[0] & 0xff) + "." + (addressBytes[1] & 0xff) + "." + (addressBytes[2] & 0xff) + "." + (addressBytes[3] & 0xff);
} else if (addressBytes.length == 16) {
return "[" + toOptimalStringV6(addressBytes) + "]";
} else {
throw CommonMessages.msg.invalidAddressBytes(addressBytes.length);
}
}
/**
* Get the IPv6 equivalent of the given address. If the address is IPv4 then it is returned as a compatibility
* address.
*
* @param inetAddress the address to convert (must not be {@code null})
* @return the converted address (not {@code null})
*/
public static Inet6Address toInet6Address(InetAddress inetAddress) {
if (inetAddress instanceof Inet6Address) {
return (Inet6Address) inetAddress;
} else {
assert inetAddress instanceof Inet4Address;
final byte[] addr = new byte[16];
addr[10] = addr[11] = (byte) 0xff;
System.arraycopy(inetAddress.getAddress(), 0, addr, 12, 4);
// get unresolved host name
try {
return Inet6Address.getByAddress(getHostNameIfResolved(inetAddress), addr, 0);
} catch (UnknownHostException e) {
// not possible
throw new IllegalStateException(e);
}
}
}
/**
* Get the host name of the given address, if it is resolved. Otherwise, return {@code null}.
*
* @param inetAddress the address to check (must not be {@code null})
* @return the host name, or {@code null} if the address has no host name and is unresolved
*/
public static String getHostNameIfResolved(InetAddress inetAddress) {
final String hostString = new InetSocketAddress(inetAddress, 0).getHostString();
final String toString = inetAddress.toString();
final int slash = toString.lastIndexOf('/');
if (slash == 0) {
// it might be unresolved or it might explicitly be ""
return hostString.isEmpty() ? "" : null;
}
return hostString;
}
/**
* Get a resolved socket address from the given URI.
*
* @param uri the URI (must not be {@code null})
* @param defaultPort the default port to use if none is given (must be in the range {@code 1 ≤ n ≤ 65535}
* @param addressType the class of the {@code InetAddress} to search for (must not be {@code null})
* @return the socket address, or {@code null} if the URI does not have a host component
* @throws UnknownHostException if address resolution failed
*/
public static InetSocketAddress getResolved(URI uri, int defaultPort, Class addressType) throws UnknownHostException {
Assert.checkNotNullParam("uri", uri);
Assert.checkMinimumParameter("defaultPort", 1, defaultPort);
Assert.checkMaximumParameter("defaultPort", 65535, defaultPort);
Assert.checkNotNullParam("addressType", addressType);
final String uriHost = uri.getHost();
if (uriHost == null) {
return null;
}
final InetAddress resolved = getAddressByNameAndType(uriHost, addressType);
final int uriPort = uri.getPort();
return uriPort != - 1 ? new InetSocketAddress(resolved, uriPort) : new InetSocketAddress(resolved, defaultPort);
}
/**
* Get the resolved socket address from the given URI.
*
* @param uri the URI (must not be {@code null})
* @param defaultPort the default port to use if none is given (must be in the range {@code 1 ≤ n ≤ 65535}
* @return the socket address, or {@code null} if the URI does not have a host component
* @throws UnknownHostException if address resolution failed
*/
public static InetSocketAddress getResolved(URI uri, int defaultPort) throws UnknownHostException {
return getResolved(uri, defaultPort, InetAddress.class);
}
/**
* Get a copy of the given socket address, but with a resolved address component.
*
* @param address the (possibly unresolved) address (must not be {@code null})
* @return the resolved address (not {@code null})
* @throws UnknownHostException if address resolution failed
*/
public static InetSocketAddress getResolved(InetSocketAddress address) throws UnknownHostException {
return getResolved(address, InetAddress.class);
}
/**
* Get a copy of the given socket address, but with a resolved address component of the given type.
*
* @param address the (possibly unresolved) address (must not be {@code null})
* @param addressType the class of the {@code InetAddress} to search for (must not be {@code null})
* @return the resolved address (not {@code null})
* @throws UnknownHostException if address resolution failed, or if no addresses of the given type were found, or
* if the given address was already resolved but is not of the given address type
*/
public static InetSocketAddress getResolved(InetSocketAddress address, Class addressType) throws UnknownHostException {
Assert.checkNotNullParam("address", address);
Assert.checkNotNullParam("addressType", addressType);
if (! address.isUnresolved()) {
if (! addressType.isInstance(address.getAddress())) {
// the address part does not match
throw new UnknownHostException(address.getHostString());
}
return address;
}
return new InetSocketAddress(getAddressByNameAndType(address.getHostString(), addressType), address.getPort());
}
/**
* Resolve the given host name, returning the first answer with the given address type.
*
* @param hostName the host name to resolve (must not be {@code null})
* @param addressType the class of the {@code InetAddress} to search for (must not be {@code null})
* @param the type of the {@code InetAddress} to search for
* @return the resolved address (not {@code null})
* @throws UnknownHostException if address resolution failed or if no addresses of the given type were found
*/
public static T getAddressByNameAndType(String hostName, Class addressType) throws UnknownHostException {
Assert.checkNotNullParam("hostName", hostName);
Assert.checkNotNullParam("addressType", addressType);
if (addressType == InetAddress.class) {
return addressType.cast(InetAddress.getByName(hostName));
}
for (InetAddress inetAddress : InetAddress.getAllByName(hostName)) {
if (addressType.isInstance(inetAddress)) {
return addressType.cast(inetAddress);
}
}
// no i18n here because this is a "standard" exception
throw new UnknownHostException(hostName);
}
/**
* Resolve the given host name, returning all answers with the given address type.
*
* @param hostName the host name to resolve (must not be {@code null})
* @param addressType the class of the {@code InetAddress} to search for (must not be {@code null})
* @param the type of the {@code InetAddress} to search for
* @return the resolved addresses (not {@code null})
* @throws UnknownHostException if address resolution failed or if no addresses of the given type were found
*/
@SuppressWarnings("unchecked")
public static T[] getAllAddressesByNameAndType(String hostName, Class addressType) throws UnknownHostException {
Assert.checkNotNullParam("hostName", hostName);
Assert.checkNotNullParam("addressType", addressType);
if (addressType == InetAddress.class) {
// safe because T == InetAddress
return (T[]) InetAddress.getAllByName(hostName);
}
final InetAddress[] addresses = InetAddress.getAllByName(hostName);
final int length = addresses.length;
int count = 0;
for (InetAddress inetAddress : addresses) {
if (addressType.isInstance(inetAddress)) {
count ++;
}
}
if (count == 0) {
// no i18n here because this is a "standard" exception
throw new UnknownHostException(hostName);
}
final T[] newArray = (T[]) Array.newInstance(addressType, count);
if (count == length) {
//noinspection SuspiciousSystemArraycopy
System.arraycopy(addresses, 0, newArray, 0, length);
} else {
int idx = 0;
for (InetAddress inetAddress : addresses) {
if (addressType.isInstance(inetAddress)) {
newArray[idx] = addressType.cast(inetAddress);
}
}
}
return newArray;
}
/**
* Get an IPv4 address from four integer segments. Each segment must be between 0 and 255.
*
* @param s1 the first segment
* @param s2 the second segment
* @param s3 the third segment
* @param s4 the fourth segment
* @return the address (not {@code null})
*/
public static Inet4Address getInet4Address(int s1, int s2, int s3, int s4) {
byte[] bytes = new byte[4];
Assert.checkMinimumParameter("s1", 0, s1);
Assert.checkMaximumParameter("s1", 255, s1);
Assert.checkMinimumParameter("s2", 0, s2);
Assert.checkMaximumParameter("s2", 255, s2);
Assert.checkMinimumParameter("s3", 0, s3);
Assert.checkMaximumParameter("s3", 255, s3);
Assert.checkMinimumParameter("s4", 0, s4);
Assert.checkMaximumParameter("s4", 255, s4);
bytes[0] = (byte) s1;
bytes[1] = (byte) s2;
bytes[2] = (byte) s3;
bytes[3] = (byte) s4;
try {
return (Inet4Address) InetAddress.getByAddress(s1 + "." + s2 + "." + s3 + "." + s4, bytes);
} catch (UnknownHostException e) {
// not possible
throw new IllegalStateException(e);
}
}
/**
* Get an IPv6 address from eight integer segments. Each segment must be between 0 and 65535 ({@code 0xffff}).
*
* @param s1 the first segment
* @param s2 the second segment
* @param s3 the third segment
* @param s4 the fourth segment
* @param s5 the fifth segment
* @param s6 the sixth segment
* @param s7 the seventh segment
* @param s8 the eighth segment
* @return the address (not {@code null})
*/
public static Inet6Address getInet6Address(int s1, int s2, int s3, int s4, int s5, int s6, int s7, int s8) {
byte[] bytes = new byte[16];
Assert.checkMinimumParameter("s1", 0, s1);
Assert.checkMaximumParameter("s1", 0xffff, s1);
Assert.checkMinimumParameter("s2", 0, s2);
Assert.checkMaximumParameter("s2", 0xffff, s2);
Assert.checkMinimumParameter("s3", 0, s3);
Assert.checkMaximumParameter("s3", 0xffff, s3);
Assert.checkMinimumParameter("s4", 0, s4);
Assert.checkMaximumParameter("s4", 0xffff, s4);
Assert.checkMinimumParameter("s5", 0, s5);
Assert.checkMaximumParameter("s5", 0xffff, s5);
Assert.checkMinimumParameter("s6", 0, s6);
Assert.checkMaximumParameter("s6", 0xffff, s6);
Assert.checkMinimumParameter("s7", 0, s7);
Assert.checkMaximumParameter("s7", 0xffff, s7);
Assert.checkMinimumParameter("s8", 0, s8);
Assert.checkMaximumParameter("s8", 0xffff, s8);
bytes[0] = (byte) (s1 >> 8);
bytes[1] = (byte) s1;
bytes[2] = (byte) (s2 >> 8);
bytes[3] = (byte) s2;
bytes[4] = (byte) (s3 >> 8);
bytes[5] = (byte) s3;
bytes[6] = (byte) (s4 >> 8);
bytes[7] = (byte) s4;
bytes[8] = (byte) (s5 >> 8);
bytes[9] = (byte) s5;
bytes[10] = (byte) (s6 >> 8);
bytes[11] = (byte) s6;
bytes[12] = (byte) (s7 >> 8);
bytes[13] = (byte) s7;
bytes[14] = (byte) (s8 >> 8);
bytes[15] = (byte) s8;
try {
return Inet6Address.getByAddress(toOptimalStringV6(bytes), bytes, 0);
} catch (UnknownHostException e) {
// not possible
throw new IllegalStateException(e);
}
}
/**
* Checks whether given String is a valid IPv6 address.
*
* @param address address textual representation
* @return {@code true} if {@code address} is a valid IPv6 address, {@code false} otherwise
*/
public static boolean isInet6Address(String address) {
return parseInet6AddressToBytes(address) != null;
}
/**
* Parse an IPv6 address into an {@code Inet6Address} object.
*
* @param address the address to parse
* @return the parsed address, or {@code null} if the address is not valid
*/
public static Inet6Address parseInet6Address(String address) {
return parseInet6Address(address, null);
}
/**
* Parse an IPv6 address into an {@code Inet6Address} object.
*
* @param address the address to parse (must not be {@code null})
* @param hostName the host name to use in the resultant object, or {@code null} to use the string representation of
* the address
* @return the parsed address, or {@code null} if the address is not valid
*/
public static Inet6Address parseInet6Address(String address, String hostName) {
final byte[] bytes = parseInet6AddressToBytes(address);
if (bytes == null) {
return null;
}
int scopeId = 0;
Inet6Address inetAddress;
try {
inetAddress = Inet6Address.getByAddress(hostName == null ? toOptimalStringV6(bytes) : hostName, bytes, 0);
} catch (UnknownHostException e) {
// not possible
throw new IllegalStateException(e);
}
final int pctIdx = address.indexOf('%');
if (pctIdx != -1) {
scopeId = getScopeId(address.substring(pctIdx + 1), inetAddress);
if (scopeId == 0) {
// address not valid after all...
return null;
}
try {
inetAddress = Inet6Address.getByAddress(hostName == null ? toOptimalStringV6(bytes) : hostName, bytes, scopeId);
} catch (UnknownHostException e) {
// not possible
throw new IllegalStateException(e);
}
}
return inetAddress;
}
/**
* Parse an IPv6 address into an {@code Inet6Address} object, throwing an exception on failure.
*
* @param address the address to parse
* @return the parsed address (not {@code null})
* @throws IllegalArgumentException if the address is not valid
*/
public static Inet6Address parseInet6AddressOrFail(String address) {
final Inet6Address result = parseInet6Address(address, null);
if (result == null) throw CommonMessages.msg.invalidAddress(address);
return result;
}
/**
* Parse an IPv6 address into an {@code Inet6Address} object.
*
* @param address the address to parse (must not be {@code null})
* @param hostName the host name to use in the resultant object, or {@code null} to use the string representation of
* the address
* @return the parsed address (not {@code null})
* @throws IllegalArgumentException if the address is not valid
*/
public static Inet6Address parseInet6AddressOrFail(String address, String hostName) {
final Inet6Address result = parseInet6Address(address, hostName);
if (result == null) throw CommonMessages.msg.invalidAddress(address);
return result;
}
/**
* Checks whether given String is a valid IPv4 address.
*
* @param address address textual representation
* @return {@code true} if {@code address} is a valid IPv4 address, {@code false} otherwise
*/
public static boolean isInet4Address(String address) {
return parseInet4AddressToBytes(address) != null;
}
/**
* Parse an IPv4 address into an {@code Inet4Address} object.
*
* @param address the address to parse
* @return the parsed address, or {@code null} if the address is not valid
*/
public static Inet4Address parseInet4Address(String address) {
return parseInet4Address(address, null);
}
/**
* Parse an IPv4 address into an {@code Inet4Address} object.
*
* @param address the address to parse
* @param hostName the host name to use in the resultant object, or {@code null} to use the string representation of
* the address
* @return the parsed address, or {@code null} if the address is not valid
*/
public static Inet4Address parseInet4Address(String address, String hostName) {
final byte[] bytes = parseInet4AddressToBytes(address);
if (bytes == null) {
return null;
}
try {
return (Inet4Address) Inet4Address.getByAddress(hostName == null ? toOptimalString(bytes) : hostName, bytes);
} catch (UnknownHostException e) {
// not possible
throw new IllegalStateException(e);
}
}
/**
* Parse an IPv4 address into an {@code Inet4Address} object, throwing an exception on failure.
*
* @param address the address to parse
* @return the parsed address (not {@code null})
* @throws IllegalArgumentException if the address is not valid
*/
public static Inet4Address parseInet4AddressOrFail(String address) {
final Inet4Address result = parseInet4Address(address, null);
if (result == null) throw CommonMessages.msg.invalidAddress(address);
return result;
}
/**
* Parse an IPv4 address into an {@code Inet4Address} object.
*
* @param address the address to parse (must not be {@code null})
* @param hostName the host name to use in the resultant object, or {@code null} to use the string representation of
* the address
* @return the parsed address (not {@code null})
* @throws IllegalArgumentException if the address is not valid
*/
public static Inet4Address parseInet4AddressOrFail(String address, String hostName) {
final Inet4Address result = parseInet4Address(address, hostName);
if (result == null) throw CommonMessages.msg.invalidAddress(address);
return result;
}
/**
* Parse an IP address into an {@code InetAddress} object.
*
* @param address the address to parse
* @return the parsed address, or {@code null} if the address is not valid
*/
public static InetAddress parseInetAddress(String address) {
return parseInetAddress(address, null);
}
/**
* Parse an IP address into an {@code InetAddress} object.
*
* @param address the address to parse
* @param hostName the host name to use in the resultant object, or {@code null} to use the string representation of
* the address
* @return the parsed address, or {@code null} if the address is not valid
*/
public static InetAddress parseInetAddress(String address, String hostName) {
// simple heuristic
if (address.indexOf(':') != -1) {
return parseInet6Address(address, hostName);
} else {
return parseInet4Address(address, hostName);
}
}
/**
* Parse an IP address into an {@code InetAddress} object, throwing an exception on failure.
*
* @param address the address to parse
* @return the parsed address (not {@code null})
* @throws IllegalArgumentException if the address is not valid
*/
public static InetAddress parseInetAddressOrFail(String address) {
final InetAddress result = parseInetAddress(address, null);
if (result == null) throw CommonMessages.msg.invalidAddress(address);
return result;
}
/**
* Parse an IP address into an {@code InetAddress} object.
*
* @param address the address to parse (must not be {@code null})
* @param hostName the host name to use in the resultant object, or {@code null} to use the string representation of
* the address
* @return the parsed address (not {@code null})
* @throws IllegalArgumentException if the address is not valid
*/
public static InetAddress parseInetAddressOrFail(String address, String hostName) {
final InetAddress result = parseInetAddress(address, hostName);
if (result == null) throw CommonMessages.msg.invalidAddress(address);
return result;
}
/**
* Parse a CIDR address into a {@code CidrAddress} object.
*
* @param address the address to parse
* @return the parsed address, or {@code null} if the address is not valid
*/
public static CidrAddress parseCidrAddress(String address) {
final int idx = address.indexOf('/');
if (idx == -1) {
return null;
}
int mask;
try {
mask = Integer.parseInt(address.substring(idx + 1));
} catch (NumberFormatException e) {
return null;
}
final byte[] addressBytes = parseInetAddressToBytes(address.substring(0, idx));
if (addressBytes == null) {
return null;
}
try {
return CidrAddress.create(addressBytes, mask, false);
} catch (IllegalArgumentException e) {
return null;
}
}
/**
* Converts IPv6 address from textual representation to bytes.
*
* If given string doesn't represent valid IPv6 address, the method returns {@code null}.
*
* @param address address textual representation
* @return byte array representing the address, or {@code null} if the address is not valid
*/
public static byte[] parseInet6AddressToBytes(String address) {
if (address == null || address.isEmpty()) {
return null;
}
// remove brackets if present
if (address.startsWith("[") && address.endsWith("]")) {
address = address.substring(1, address.length() - 1);
}
final int pctIdx = address.indexOf('%');
if (pctIdx != -1) {
address = address.substring(0, pctIdx);
}
String[] segments = address.split(":", 10);
// there can be minimum of 2 and maximum of 8 colons, which makes 3 respectively 9 segments
if (segments.length > 9 || segments.length < 3) {
return null;
}
// if the first segment is empty, the second one must be too - "::
"
if (segments[0].length() == 0 && segments[1].length() != 0) {
return null;
}
// if the last segment is empty, the segment before it must be too - "::"
if (segments[segments.length - 1].length() == 0 && segments[segments.length - 2].length() != 0) {
return null;
}
// validate segments
for (int i = 0; i < segments.length; i++) {
for (int charIdx = 0; charIdx < segments[i].length(); charIdx++) {
char c = segments[i].charAt(charIdx);
if (c == '.' && i != segments.length - 1) {
return null; // "." is allowed in the last segment only
} else if (c != '.' && c != ':' && Character.digit(c, 16) == -1) {
return null; // not ".", ":" or a digit
}
}
}
// look for an empty segment - "::"
int emptyIndex = -1;
for (int i = 0; i < segments.length - 1; i++) {
if (segments[i].length() == 0) {
if (emptyIndex > 0) {
return null; // more than one occurrence of "::", invalid address
} else if (emptyIndex != 0) { // don't rewrite skipIndex=0, when address starts with "::"
emptyIndex = i;
}
}
}
boolean containsIPv4 = segments[segments.length - 1].contains(".");
int totalSegments = containsIPv4 ? 7 : 8; // if the last segment contains IPv4 notation ("::ffff:192.0.0.1"), the address only has 7 segments
if (emptyIndex == -1 && segments.length != totalSegments) {
return null; // no substitution but incorrect number of segments
}
int skipIndex;
int skippedSegments;
boolean isDefaultRoute = segments.length == 3
&& segments[0].isEmpty() && segments[1].isEmpty() && segments[2].isEmpty(); // is address just "::"?
if (isDefaultRoute) {
skipIndex = 0;
skippedSegments = 8;
} else if (segments[0].isEmpty() || segments[segments.length - 1].isEmpty()) {
// "::" is at the beginning or end of the address
skipIndex = emptyIndex;
skippedSegments = totalSegments - segments.length + 2;
} else if (emptyIndex > -1) {
// "::" somewhere in the middle
skipIndex = emptyIndex;
skippedSegments = totalSegments - segments.length + 1;
} else {
// no substitution
skipIndex = 0;
skippedSegments = 0;
}
ByteBuffer bytes = ByteBuffer.allocate(16);
try {
// convert segments before "::"
for (int i = 0; i < skipIndex; i++) {
bytes.putShort(parseHexadecimal(segments[i]));
}
// fill "0" characters into expanded segments
for (int i = skipIndex; i < skipIndex + skippedSegments; i++) {
bytes.putShort((short) 0);
}
// convert segments after "::"
for (int i = skipIndex + skippedSegments; i < totalSegments; i++) {
int segmentIdx = segments.length - (totalSegments - i);
if (containsIPv4 && i == totalSegments - 1) {
// we are at the last segment and it contains IPv4 address
String[] ipV4Segments = segments[segmentIdx].split("\\.");
if (ipV4Segments.length != 4) {
return null; // incorrect number of segments in IPv4
}
for (int idxV4 = 0; idxV4 < 4; idxV4++) {
bytes.put(parseDecimal(ipV4Segments[idxV4]));
}
} else {
bytes.putShort(parseHexadecimal(segments[segmentIdx]));
}
}
return bytes.array();
} catch (NumberFormatException e) {
return null;
}
}
/**
* Converts IPv4 address from textual representation to bytes.
*
* If given string doesn't represent valid IPv4 address, the method returns {@code null}.
*
* This only supports decimal notation.
*
* @param address address textual representation
* @return byte array representing the address, or {@code null} if the address is not valid
*/
public static byte[] parseInet4AddressToBytes(String address) {
String[] segments = address.split("\\.", 5);
if (segments.length != 4) {
return null; // require 4 segments
}
// validate segments
for (int i = 0; i < segments.length; i++) {
if (segments[i].length() < 1) {
return null; // empty segment
}
for (int cidx = 0; cidx < segments[i].length(); cidx++) {
if (Character.digit(segments[i].charAt(cidx), 10) < 0) {
return null; // not a digit
}
}
}
byte[] bytes = new byte[4];
try {
for (int i = 0; i < segments.length; i++) {
bytes[i] = parseDecimal(segments[i]);
}
return bytes;
} catch (NumberFormatException e) {
return null;
}
}
/**
* Converts an IP address from textual representation to bytes.
*
* If given string doesn't represent valid IP address, the method returns {@code null}.
*
* @param address address textual representation
* @return byte array representing the address, or {@code null} if the address is not valid
*/
public static byte[] parseInetAddressToBytes(String address) {
// simple heuristic
if (address.indexOf(':') != -1) {
return parseInet6AddressToBytes(address);
} else {
return parseInet4AddressToBytes(address);
}
}
/**
* Get the scope ID of the given address (if it is an IPv6 address).
*
* @return the scope ID, or 0 if there is none or the address is an IPv4 address
*/
public static int getScopeId(InetAddress address) {
return address instanceof Inet6Address ? ((Inet6Address) address).getScopeId() : 0;
}
private static final Pattern NUMERIC = Pattern.compile("\\d+");
/**
* Attempt to get the scope ID of the given string. If the string is numeric then the number is parsed
* and returned as-is. If the scope is a string, then a search for the matching network interface will occur.
*
* @param scopeName the scope number or name as a string (must not be {@code null})
* @return the scope ID, or 0 if no matching scope could be found
*/
public static int getScopeId(String scopeName) {
return getScopeId(scopeName, null);
}
/**
* Attempt to get the scope ID of the given string. If the string is numeric then the number is parsed
* and returned as-is. If the scope is a string, then a search for the matching network interface will occur.
*
* @param scopeName the scope number or name as a string (must not be {@code null})
* @param compareWith the address to compare with, to ensure that the wrong local scope is not selected (may be {@code null})
* @return the scope ID, or 0 if no matching scope could be found
*/
public static int getScopeId(String scopeName, InetAddress compareWith) {
Assert.checkNotNullParam("scopeName", scopeName);
if (NUMERIC.matcher(scopeName).matches()) try {
return Integer.parseInt(scopeName);
} catch (NumberFormatException ignored) {
return 0;
}
final NetworkInterface ni = findInterfaceWithScopeId(scopeName);
if (ni == null) return 0;
return getScopeId(ni, compareWith);
}
public static NetworkInterface findInterfaceWithScopeId(String scopeName) {
final Enumeration enumeration;
try {
enumeration = NetworkInterface.getNetworkInterfaces();
} catch (SocketException ignored) {
return null;
}
while (enumeration.hasMoreElements()) {
final NetworkInterface net = enumeration.nextElement();
if (net.getName().equals(scopeName)) {
return net;
}
}
return null;
}
public static int getScopeId(NetworkInterface networkInterface) {
return getScopeId(networkInterface, null);
}
public static int getScopeId(NetworkInterface networkInterface, InetAddress compareWith) {
Assert.checkNotNullParam("networkInterface", networkInterface);
Inet6Address cw6 = compareWith instanceof Inet6Address ? (Inet6Address) compareWith : null;
Inet6Address address = doPrivileged((PrivilegedAction) () -> {
final Enumeration addresses = networkInterface.getInetAddresses();
while (addresses.hasMoreElements()) {
final InetAddress a = addresses.nextElement();
if (a instanceof Inet6Address) {
final Inet6Address a6 = (Inet6Address) a;
if (cw6 == null ||
a6.isLinkLocalAddress() == cw6.isLinkLocalAddress() &&
a6.isSiteLocalAddress() == cw6.isSiteLocalAddress()
) {
return a6;
}
}
}
return null;
});
return address == null ? 0 : address.getScopeId();
}
private static byte parseDecimal(String number) {
int i = Integer.parseInt(number);
if (i < 0 || i > 255) {
throw new NumberFormatException();
}
return (byte) i;
}
private static short parseHexadecimal(String hexNumber) {
int i = Integer.parseInt(hexNumber, 16);
if (i > 0xffff) {
throw new NumberFormatException();
}
return (short) i;
}
private static String toOptimalStringV6(final byte[] bytes) {
final int[] segments = new int[8];
for (int i = 0; i < 8; i ++) {
segments[i] = (bytes[i << 1] & 0xff) << 8 | bytes[(i << 1) + 1] & 0xff;
}
// now loop through the segments and add them as optimally as possible
final StringBuilder b = new StringBuilder();
for (int i = 0; i < 8; i ++) {
if (segments[i] == 0) {
if (i == 7) {
b.append('0');
} else {
// possible to collapse it
i++;
if (segments[i] == 0) {
// yup
b.append(':').append(':');
for (i++; i < 8; i++) {
if (segments[i] == 0xffff && b.length() == 2) {
b.append("ffff");
if (i == 5) {
// it's an IPv4 compat address.
b.append(':').append(bytes[12] & 0xff).append('.').append(bytes[13] & 0xff).append('.').append(bytes[14] & 0xff).append('.').append(bytes[15] & 0xff);
i = 8;
} else if (i == 4 && segments[5] == 0) {
// it's a SIIT address.
b.append(":0:").append(bytes[12] & 0xff).append('.').append(bytes[13] & 0xff).append('.').append(bytes[14] & 0xff).append('.').append(bytes[15] & 0xff);
i = 8;
} else {
// finally break and do the rest normally
for (i++; i < 8; i++) {
b.append(':').append(Integer.toHexString(segments[i]));
}
}
} else if (segments[i] != 0) {
// finally break and do the rest normally
b.append(Integer.toHexString(segments[i]));
for (i++; i < 8; i++) {
b.append(':').append(Integer.toHexString(segments[i]));
}
}
}
} else {
// no, just a single 0 in isolation doesn't get collapsed
if (i > 1) b.append(':');
b.append('0').append(':').append(Integer.toHexString(segments[i]));
}
}
} else {
if (i > 0) b.append(':');
b.append(Integer.toHexString(segments[i]));
}
}
return b.toString();
}
}