com.google.gerrit.server.util.SocketUtil Maven / Gradle / Ivy
// Copyright (C) 2009 The Android Open Source Project
//
// 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 com.google.gerrit.server.util;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.net.UnknownHostException;
public final class SocketUtil {
/** True if this InetAddress is a raw IPv6 in dotted quad notation. */
public static boolean isIPv6(InetAddress ip) {
return ip instanceof Inet6Address && ip.getHostName().equals(ip.getHostAddress());
}
/** Get the name or IP address, or {@code *} if this address is a wildcard IP. */
public static String hostname(InetSocketAddress addr) {
if (addr.getAddress() != null) {
if (addr.getAddress().isAnyLocalAddress()) {
return "*";
}
return addr.getAddress().getHostName();
}
return addr.getHostName();
}
/** Format an address string into {@code host:port} or {@code *:port} syntax. */
public static String format(SocketAddress s, int defaultPort) {
if (s instanceof InetSocketAddress) {
final InetSocketAddress addr = (InetSocketAddress) s;
if (addr.getPort() == defaultPort) {
return safeHostname(hostname(addr));
}
return format(hostname(addr), addr.getPort());
}
return s.toString();
}
/** Format an address string into {@code host:port} or {@code *:port} syntax. */
public static String format(String hostname, int port) {
return safeHostname(hostname) + ":" + port;
}
private static String safeHostname(String hostname) {
if (0 <= hostname.indexOf(':')) {
hostname = "[" + hostname + "]";
}
return hostname;
}
/** Parse an address string such as {@code host:port} or {@code *:port}. */
public static InetSocketAddress parse(String desc, int defaultPort) {
String hostStr;
String portStr;
if (desc.startsWith("[")) {
// IPv6, as a raw IP address.
//
final int hostEnd = desc.indexOf(']');
if (hostEnd < 0) {
throw new IllegalArgumentException("invalid IPv6: " + desc);
}
hostStr = desc.substring(1, hostEnd);
portStr = desc.substring(hostEnd + 1);
} else {
// IPv4, or a host name.
//
final int hostEnd = desc.indexOf(':');
hostStr = 0 <= hostEnd ? desc.substring(0, hostEnd) : desc;
portStr = 0 <= hostEnd ? desc.substring(hostEnd) : "";
}
if ("".equals(hostStr)) {
hostStr = "*";
}
if (portStr.startsWith(":")) {
portStr = portStr.substring(1);
}
final int port;
if (portStr.length() > 0) {
try {
port = Integer.parseInt(portStr);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("invalid port: " + desc);
}
} else {
port = defaultPort;
}
if ("*".equals(hostStr)) {
return new InetSocketAddress(port);
}
return InetSocketAddress.createUnresolved(hostStr, port);
}
/** Parse and resolve an address string, looking up the IP address. */
public static InetSocketAddress resolve(String desc, int defaultPort) {
final InetSocketAddress addr = parse(desc, defaultPort);
if (addr.getAddress() != null && addr.getAddress().isAnyLocalAddress()) {
return addr;
}
try {
final InetAddress host = InetAddress.getByName(addr.getHostName());
return new InetSocketAddress(host, addr.getPort());
} catch (UnknownHostException e) {
throw new IllegalArgumentException("unknown host: " + desc, e);
}
}
private SocketUtil() {}
}