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junixsocket is a Java/JNI library that allows the use of Unix Domain Sockets (AF_UNIX sockets) and other socket types, such as AF_TIPC and AF_VSOCK, from Java, using the standard Socket API
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/*
* junixsocket
*
* Copyright 2009-2024 Christian Kohlschütter
*
* 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.newsclub.net.unix;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.net.DatagramSocket;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.ServerSocket;
import java.net.SocketAddress;
import java.net.SocketException;
import java.net.URI;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;
import org.eclipse.jdt.annotation.NonNull;
import org.eclipse.jdt.annotation.Nullable;
import org.newsclub.net.unix.pool.ObjectPool;
import org.newsclub.net.unix.pool.ObjectPool.Lease;
import com.google.errorprone.annotations.Immutable;
import com.kohlschutter.annotations.compiletime.SuppressFBWarnings;
/**
* Some {@link SocketAddress} that is supported by junixsocket, such as {@link AFUNIXSocketAddress}.
*
* @author Christian Kohlschütter
*/
@Immutable
@SuppressWarnings({"PMD.CouplingBetweenObjects", "PMD.CyclomaticComplexity"})
public abstract class AFSocketAddress extends InetSocketAddress {
private static final long serialVersionUID = 1L; // do not change!
/**
* Just a marker for "don't actually bind" (checked with "=="). Used in combination with a
* superclass' bind method, which should trigger "setBound()", etc.
*/
static final AFSocketAddress INTERNAL_DUMMY_BIND = new SentinelSocketAddress(0);
static final AFSocketAddress INTERNAL_DUMMY_CONNECT = new SentinelSocketAddress(1);
static final AFSocketAddress INTERNAL_DUMMY_DONT_CONNECT = new SentinelSocketAddress(2);
private static final int SOCKADDR_NATIVE_FAMILY_OFFSET = NativeUnixSocket.isLoaded() //
? NativeUnixSocket.sockAddrNativeFamilyOffset() : -1;
private static final int SOCKADDR_NATIVE_DATA_OFFSET = NativeUnixSocket.isLoaded() //
? NativeUnixSocket.sockAddrNativeDataOffset() : -1;
private static final int SOCKADDR_MAX_LEN = NativeUnixSocket.isLoaded() //
? NativeUnixSocket.sockAddrLength(0) : 256;
private static final Map, Map>> ADDRESS_CACHE =
new HashMap<>();
static final ObjectPool SOCKETADDRESS_BUFFER_TL = ObjectPool.newThreadLocalPool(
() -> {
return AFSocketAddress.newSockAddrDirectBuffer(SOCKADDR_MAX_LEN);
}, (o) -> {
o.clear();
return true;
});
private static final boolean USE_DESERIALIZATION_FOR_INIT;
static {
String v = System.getProperty("org.newsclub.net.unix.AFSocketAddress.deserialize", "");
USE_DESERIALIZATION_FOR_INIT = v.isEmpty() ? NativeLibraryLoader.isAndroid() : Boolean
.parseBoolean(v);
}
/**
* Some byte-level representation of this address, which can only be converted to a native
* representation in combination with the domain ID.
*/
@SuppressFBWarnings("JCIP_FIELD_ISNT_FINAL_IN_IMMUTABLE_CLASS")
private byte[] bytes;
/**
* An {@link InetAddress}-wrapped representation of this address. Only created upon demand.
*/
@SuppressFBWarnings("JCIP_FIELD_ISNT_FINAL_IN_IMMUTABLE_CLASS") // only modified during
// construction/deserialization
private InetAddress inetAddress = null; // derived from bytes
/**
* The system-native representation of this address, or {@code null}.
*/
@SuppressWarnings("PMD.ImmutableField")
private transient ByteBuffer nativeAddress;
/**
* The address family.
*/
private transient AFAddressFamily addressFamily;
/**
* Creates a new socket address.
*
* @param port The port.
* @param socketAddress The socket address in junixsocket-specific byte-array representation.
* @param nativeAddress The socket address in system-native representation.
* @param af The address family.
* @throws SocketException on error.
*/
@SuppressFBWarnings("CT_CONSTRUCTOR_THROW")
protected AFSocketAddress(int port, final byte[] socketAddress, Lease nativeAddress,
AFAddressFamily af) throws SocketException {
/*
* Initializing the superclass with an unresolved hostname helps us pass the #equals and
* #hashCode checks, which unfortunately are declared final in InetSocketAddress.
*
* Using a resolved address (with the address bit initialized) would be ideal, but resolved
* addresses can only be IPv4 or IPv6 (at least as of Java 16 and earlier).
*/
super(AFInetAddress.createUnresolvedHostname(socketAddress, af), port >= 0 && port <= 0xffff
? port : 0);
initAFSocketAddress(this, port, socketAddress, nativeAddress, af);
}
/**
* Only for {@link SentinelSocketAddress}.
*
* @param clazz The {@link SentinelSocketAddress} class.
* @param port A sentinel port number.
*/
@SuppressWarnings("PMD.UnusedFormalParameter")
AFSocketAddress(Class clazz, int port) {
super(InetAddress.getLoopbackAddress(), port);
this.nativeAddress = null;
this.bytes = new byte[0];
this.addressFamily = null;
}
@SuppressWarnings({"cast", "this-escape"})
private static void initAFSocketAddress(AFSocketAddress addr, int port,
final byte[] socketAddress, Lease nativeAddress, AFAddressFamily af)
throws SocketException {
if (socketAddress.length == 0) {
throw new SocketException("Illegal address length: " + socketAddress.length);
}
addr.nativeAddress = nativeAddress == null ? null : (ByteBuffer) (Object) nativeAddress.get()
.duplicate().rewind();
if (port < -1) {
throw new IllegalArgumentException("port out of range");
} else if (port > 0xffff) {
if (!NativeUnixSocket.isLoaded()) {
throw (SocketException) new SocketException(
"Cannot set SocketAddress port - junixsocket JNI library is not available").initCause(
NativeUnixSocket.unsupportedException());
}
NativeUnixSocket.setPort1(addr, port);
}
addr.bytes = socketAddress.clone();
addr.addressFamily = af;
}
/**
* Returns a new {@link AFSocketAddress} instance via deserialization. This is a trick to
* workaround certain environments that do not allow the construction of {@link InetSocketAddress}
* instances without trying DNS resolution.
*
* @param The subclass (must be a direct subclass of {@link AFSocketAddress}).
* @param port The port to use.
* @param socketAddress The junixsocket representation of the socket address.
* @param nativeAddress The system-native representation of the socket address, or {@code null}.
* @param af The address family, corresponding to the subclass
* @param constructor The constructor to use as fallback
* @return The new instance.
* @throws SocketException on error.
*/
protected static A newDeserializedAFSocketAddress(int port,
final byte[] socketAddress, Lease nativeAddress, AFAddressFamily af,
AFSocketAddressConstructor constructor) throws SocketException {
String hostname = AFInetAddress.createUnresolvedHostname(socketAddress, af);
if (hostname == null || hostname.isEmpty()) {
return constructor.newAFSocketAddress(port, socketAddress, nativeAddress);
}
try (ObjectInputStream oin = new ObjectInputStream(new ByteArrayInputStream(AFSocketAddress
.craftSerializedObject(af.getSocketAddressClass(), hostname, (port >= 0 && port <= 0xffff
? port : 0))))) {
@SuppressWarnings("unchecked")
A addr = (A) oin.readObject();
initAFSocketAddress(addr, port, socketAddress, nativeAddress, af);
return addr;
} catch (SocketException e) {
throw e;
} catch (ClassNotFoundException | IOException e) {
throw (SocketException) new SocketException("Unexpected deserialization problem").initCause(
e);
}
}
/**
* Creates a byte-representation of a serialized {@link AFSocketAddress} instance, overriding
* hostname and port, which allows bypassing DNS resolution.
*
* @param className The actual subclass.
* @param hostname The hostname to use (must not be empty or null).
* @param port The port to use.
* @return The byte representation.
*/
private static byte[] craftSerializedObject(Class className,
String hostname, int port) {
ByteBuffer bb = ByteBuffer.allocate(768);
bb.putShort((short) 0xaced); // STREAM_MAGIC
bb.putShort((short) 5); // STREAM_VERSION
bb.put((byte) 0x73); // TC_OBJECT
bb.put((byte) 0x72); // TC_CLASSDESC
putShortLengthUtf8(bb, className.getName());
bb.putLong(1); // serialVersionUID of subclass (expected to be 1)
bb.putInt(0x02000078);
bb.put((byte) 0x72);
putShortLengthUtf8(bb, AFSocketAddress.class.getName());
bb.putLong(serialVersionUID); // serialVersionUID of AFSocketAddress
bb.putInt(0x0300025B);
putShortLengthUtf8(bb, "bytes");
bb.putInt(0x7400025B);
bb.putShort((short) 0x424C);
putShortLengthUtf8(bb, "inetAddress");
bb.put((byte) 0x74);
putShortLengthEncodedClassName(bb, InetAddress.class);
bb.putShort((short) 0x7872);
putShortLengthUtf8(bb, InetSocketAddress.class.getName());
bb.putLong(5076001401234631237L); // NOPMD InetSocketAddress serialVersionUID
bb.putInt(0x03000349);
putShortLengthUtf8(bb, "port");
bb.put((byte) 0x4C);
putShortLengthUtf8(bb, "addr");
bb.putInt(0x71007E00);
bb.putShort((short) 0x034C);
putShortLengthUtf8(bb, "hostname");
bb.put((byte) 0x74);
putShortLengthEncodedClassName(bb, String.class);
bb.putShort((short) 0x7872);
putShortLengthUtf8(bb, SocketAddress.class.getName());
bb.putLong(5215720748342549866L); // NOPMD SocketAddress serialVersionUID
bb.putInt(0x02000078);
bb.put((byte) 0x70);
bb.putInt(port);
bb.putShort((short) 0x7074);
putShortLengthUtf8(bb, hostname);
bb.putInt(0x78707077);
bb.put((byte) 0x0B);
putShortLengthUtf8(bb, "undefined");
bb.put((byte) 0x78); // TC_ENDBLOCKDATA
bb.flip();
byte[] buf = new byte[bb.remaining()];
bb.get(buf);
return buf;
}
private static void putShortLengthEncodedClassName(ByteBuffer bb, Class klazz) {
putShortLengthUtf8(bb, "L" + klazz.getName().replace('.', '/') + ";");
}
private static void putShortLengthUtf8(ByteBuffer bb, String s) {
byte[] utf8 = s.getBytes(StandardCharsets.UTF_8);
bb.putShort((short) utf8.length);
bb.put(utf8);
}
/**
* Checks if {@link AFSocketAddress} instantiation should be performed via deserialization.
*
* @return {@code true} if so.
* @see #newDeserializedAFSocketAddress(int, byte[], Lease, AFAddressFamily,
* AFSocketAddressConstructor)
*/
protected static boolean isUseDeserializationForInit() {
return USE_DESERIALIZATION_FOR_INIT;
}
/**
* Checks if the address can be resolved to a {@link File}.
*
* @return {@code true} if the address has a filename.
*/
public abstract boolean hasFilename();
/**
* Returns the {@link File} corresponding with this address, if possible.
*
* A {@link FileNotFoundException} is thrown if there is no filename associated with the address,
* which applies to addresses in the abstract namespace, for example.
*
* @return The filename.
* @throws FileNotFoundException if the address is not associated with a filename.
*/
public abstract File getFile() throws FileNotFoundException;
/**
* Returns the corresponding {@link AFAddressFamily}.
*
* @return The address family instance.
*/
public final AFAddressFamily getAddressFamily() {
return addressFamily;
}
/**
* Wraps the socket name/peer name of a file descriptor as an {@link InetAddress}.
*
* @param fdesc The file descriptor.
* @param peerName If {@code true}, the remote peer name (instead of the local name) is retrieved.
* @param af The address family.
* @return The {@link InetAddress}.
*/
protected static final InetAddress getInetAddress(FileDescriptor fdesc, boolean peerName,
AFAddressFamily af) {
if (!fdesc.valid()) {
return null;
}
byte[] addr = NativeUnixSocket.sockname(af.getDomain(), fdesc, peerName);
if (addr == null) {
return null;
}
return AFInetAddress.wrapAddress(addr, af);
}
/**
* Gets the socket name/peer name of a file descriptor as an {@link AFSocketAddress}.
*
* @param The corresponding address type.
* @param fdesc The file descriptor.
* @param requestPeerName If {@code true}, the remote peer name (instead of the local name) is
* retrieved.
* @param port The port.
* @param af The address family.
* @return The {@link InetAddress}.
*/
protected static final @Nullable A getSocketAddress(
FileDescriptor fdesc, boolean requestPeerName, int port, AFAddressFamily af) {
if (!fdesc.valid()) {
return null;
}
byte[] addr = NativeUnixSocket.sockname(af.getDomain(), fdesc, requestPeerName);
if (addr == null) {
return null;
}
try {
// FIXME we could infer the "port" from the path if the socket factory supports that
return AFSocketAddress.unwrap(AFInetAddress.wrapAddress(addr, af), port, af);
} catch (SocketException e) {
throw new IllegalStateException(e);
}
}
static final AFSocketAddress preprocessSocketAddress(
Class supportedAddressClass, SocketAddress endpoint,
AFSocketAddressFromHostname afh) throws SocketException {
Objects.requireNonNull(endpoint);
if (endpoint instanceof SentinelSocketAddress) {
return (SentinelSocketAddress) endpoint;
}
if (!(endpoint instanceof AFSocketAddress)) {
if (afh != null) {
if (endpoint instanceof InetSocketAddress) {
InetSocketAddress isa = (InetSocketAddress) endpoint;
String hostname = isa.getHostString();
if (afh.isHostnameSupported(hostname)) {
try {
endpoint = afh.addressFromHost(hostname, isa.getPort());
} catch (SocketException e) {
throw e;
}
}
}
}
endpoint = mapOrFail(endpoint, supportedAddressClass);
}
Objects.requireNonNull(endpoint);
if (!supportedAddressClass.isAssignableFrom(endpoint.getClass())) {
throw new IllegalArgumentException("Can only connect to endpoints of type "
+ supportedAddressClass.getName() + ", got: " + endpoint.getClass() + ": " + endpoint);
}
return (AFSocketAddress) endpoint;
}
/**
* Returns the (non-native) byte-level representation of this address.
*
* @return The byte array.
*/
protected final byte[] getBytes() {
return bytes; // NOPMD
}
/**
* Returns a "special" {@link InetAddress} that contains information about this
* {@link AFSocketAddress}.
*
* IMPORTANT: This {@link InetAddress} does not properly compare (using
* {@link InetAddress#equals(Object)} and {@link InetAddress#hashCode()}). It should be used
* exclusively to circumvent existing APIs like {@link DatagramSocket} that only accept/return
* {@link InetAddress} and not arbitrary {@link SocketAddress} types.
*
* @return The "special" {@link InetAddress}.
*/
public final InetAddress wrapAddress() {
return AFInetAddress.wrapAddress(bytes, getAddressFamily());
}
/**
* A reference to the constructor of an AFSocketAddress subclass.
*
* @param The actual subclass.
* @author Christian Kohlschütter
*/
@FunctionalInterface
protected interface AFSocketAddressConstructor {
/**
* Constructs a new AFSocketAddress instance.
*
* @param port The port.
* @param socketAddress The socket address in junixsocket-specific byte-array representation.
* @param nativeAddress The socket address in system-native representation.
* @return The instance.
* @throws SocketException on error.
*/
@NonNull
T newAFSocketAddress(int port, byte[] socketAddress, Lease nativeAddress)
throws SocketException;
}
/**
* Resolves a junixsocket-specific byte-array representation of an {@link AFSocketAddress} to an
* actual {@link AFSocketAddress} instance, possibly reusing a cached instance.
*
* @param The concrete {@link AFSocketAddress} that is supported by this type.
* @param socketAddress The socket address in junixsocket-specific byte-array representation.
* @param port The port.
* @param af The address family.
* @return The instance.
* @throws SocketException on error.
*/
@SuppressWarnings({"unchecked", "null"})
protected static final A resolveAddress(final byte[] socketAddress,
int port, AFAddressFamily af) throws SocketException {
if (socketAddress.length == 0) {
throw new SocketException("Address cannot be empty");
}
if (port == -1) {
port = 0;
}
try (Lease lease = SOCKETADDRESS_BUFFER_TL.take()) {
ByteBuffer direct = lease.get();
int limit = NativeUnixSocket.isLoaded() ? NativeUnixSocket.bytesToSockAddr(af.getDomain(),
direct, socketAddress) : -1;
if (limit == -1) {
// not supported, but we can still create an address
return af.getAddressConstructor().newAFSocketAddress(port, socketAddress, null);
} else if (limit > SOCKADDR_MAX_LEN) {
throw new IllegalStateException("Unexpected address length");
}
direct.rewind();
direct.limit(limit);
A instance;
synchronized (AFSocketAddress.class) {
Map map;
Map> mapPorts = ADDRESS_CACHE.get(af);
if (mapPorts == null) {
instance = null;
mapPorts = new HashMap<>();
map = new HashMap<>();
mapPorts.put(port, map);
ADDRESS_CACHE.put(af, mapPorts);
} else {
map = mapPorts.get(port);
if (map == null) {
instance = null;
map = new HashMap<>();
mapPorts.put(port, map);
} else {
instance = (A) map.get(direct);
}
}
if (instance == null) {
ByteBuffer key = newSockAddrKeyBuffer(limit);
key.put(direct);
key = key.asReadOnlyBuffer();
instance = af.getAddressConstructor().newAFSocketAddress(port, socketAddress, ObjectPool
.unpooledLease(key));
map.put(key, instance);
}
}
return instance;
}
}
@SuppressWarnings("null")
static final A ofInternal(ByteBuffer socketAddressBuffer,
AFAddressFamily af) throws SocketException {
synchronized (AFSocketAddress.class) {
socketAddressBuffer.rewind();
Map> mapPorts = ADDRESS_CACHE.get(af);
if (mapPorts != null) {
Map map = mapPorts.get(0); // FIXME get port, something like
// sockAddrToPort
if (map != null) {
@SuppressWarnings("unchecked")
A address = (A) map.get(socketAddressBuffer);
if (address != null) {
return address;
}
}
}
try (Lease leasedBuffer = socketAddressBuffer.isDirect() ? null
: getNativeAddressDirectBuffer(Math.min(socketAddressBuffer.limit(), SOCKADDR_MAX_LEN))) {
if (leasedBuffer != null) {
ByteBuffer buf = leasedBuffer.get();
buf.put(socketAddressBuffer);
socketAddressBuffer = buf;
}
byte[] sockAddrToBytes = NativeUnixSocket.sockAddrToBytes(af.getDomain(),
socketAddressBuffer);
if (sockAddrToBytes == null) {
return null;
} else {
return AFSocketAddress.resolveAddress(sockAddrToBytes, 0, af);
}
}
}
}
/**
* Wraps an address as an {@link InetAddress}.
*
* @param af The address family.
* @return The {@link InetAddress}.
*/
protected final synchronized InetAddress getInetAddress(AFAddressFamily af) {
if (inetAddress == null) {
inetAddress = AFInetAddress.wrapAddress(bytes, af);
}
return inetAddress;
}
/**
* Wraps this address as an {@link InetAddress}.
*
* @return The {@link InetAddress}.
*/
protected final InetAddress getInetAddress() {
return getInetAddress(getAddressFamily());
}
@SuppressWarnings("null")
static final @NonNull ByteBuffer newSockAddrDirectBuffer(int length) {
return ByteBuffer.allocateDirect(length);
}
@SuppressWarnings("null")
static final @NonNull ByteBuffer newSockAddrKeyBuffer(int length) {
return ByteBuffer.allocate(length);
}
/**
* Returns an {@link AFSocketAddress} given a special {@link InetAddress} that encodes the byte
* sequence of an AF_UNIX etc. socket address, like those returned by {@link #wrapAddress()}.
*
* @param The corresponding address type.
* @param address The "special" {@link InetAddress}.
* @param port The port (use 0 for "none").
* @param af The address family.
* @return The {@link AFSocketAddress} instance.
* @throws SocketException if the operation fails, for example when an unsupported address is
* specified.
*/
@SuppressWarnings("null")
@NonNull
protected static final A unwrap(InetAddress address, int port,
AFAddressFamily af) throws SocketException {
Objects.requireNonNull(address);
return resolveAddress(AFInetAddress.unwrapAddress(address, af), port, af);
}
/**
* Returns an {@link AFSocketAddress} given a special {@link InetAddress} hostname that encodes
* the byte sequence of an AF_UNIX etc. socket address, like those returned by
* {@link #wrapAddress()}.
*
* @param The corresponding address type.
* @param hostname The "special" hostname, as provided by {@link InetAddress#getHostName()}.
* @param port The port (use 0 for "none").
* @param af The address family.
* @return The {@link AFSocketAddress} instance.
* @throws SocketException if the operation fails, for example when an unsupported address is
* specified.
*/
@SuppressWarnings("null")
@NonNull
protected static final A unwrap(String hostname, int port,
AFAddressFamily af) throws SocketException {
Objects.requireNonNull(hostname);
return resolveAddress(AFInetAddress.unwrapAddress(hostname, af), port, af);
}
static final int unwrapAddressDirectBufferInternal(ByteBuffer socketAddressBuffer,
SocketAddress address) throws SocketException {
if (!NativeUnixSocket.isLoaded()) {
throw new SocketException("Unsupported operation; junixsocket native library is not loaded");
}
Objects.requireNonNull(address);
address = AFSocketAddress.mapOrFail(address, AFSocketAddress.class);
AFSocketAddress socketAddress = (AFSocketAddress) address;
byte[] addr = socketAddress.getBytes();
int domain = socketAddress.getAddressFamily().getDomain();
int len = NativeUnixSocket.bytesToSockAddr(domain, socketAddressBuffer, addr);
if (len == -1) {
throw new SocketException("Unsupported domain");
}
return len;
}
/**
* Returns a thread-local direct ByteBuffer containing the native socket address representation of
* this {@link AFSocketAddress}.
*
* @return The direct {@link ByteBuffer}.
*/
final Lease getNativeAddressDirectBuffer() throws SocketException {
ByteBuffer address = nativeAddress;
if (address == null) {
throw (SocketException) new SocketException("Cannot access native address").initCause(
NativeUnixSocket.unsupportedException());
}
address = address.duplicate();
Lease lease = getNativeAddressDirectBuffer(address.limit());
ByteBuffer direct = lease.get();
address.position(0);
direct.put(address);
return lease;
}
static final Lease getNativeAddressDirectBuffer(int limit) {
Lease lease = SOCKETADDRESS_BUFFER_TL.take();
ByteBuffer direct = lease.get();
direct.position(0);
direct.limit(limit);
return lease;
}
/**
* Checks if the given address is supported by this address family.
*
* @param addr The address.
* @param af The address family.
* @return {@code true} if supported.
*/
protected static final boolean isSupportedAddress(InetAddress addr, AFAddressFamily af) {
return AFInetAddress.isSupportedAddress(addr, af);
}
/**
* Writes the native (system-level) representation of this address to the given buffer.
*
* The position of the target buffer will be at the end (i.e., after) the written data.
*
* @param buf The target buffer.
* @throws IOException on error.
*/
public final void writeNativeAddressTo(ByteBuffer buf) throws IOException {
if (nativeAddress == null) {
throw (SocketException) new SocketException("Cannot access native address").initCause(
NativeUnixSocket.unsupportedException());
}
buf.put(nativeAddress);
}
/**
* Creates a new socket connected to this address.
*
* @return The socket instance.
* @throws IOException on error.
*/
public AFSocket newConnectedSocket() throws IOException {
AFSocket socket = getAddressFamily().newSocket();
socket.connect(this);
return socket;
}
/**
* Creates a new server socket bound to this address.
*
* @return The server socket instance.
* @throws IOException on error.
*/
public AFServerSocket newBoundServerSocket() throws IOException {
AFServerSocket serverSocket = getAddressFamily().newServerSocket();
serverSocket.bind(this);
return serverSocket;
}
/**
* Creates a new server socket force-bound to this address (i.e., any additional call to
* {@link ServerSocket#bind(SocketAddress)} will ignore the passed address and use this one
* instead.
*
* @return The server socket instance.
* @throws IOException on error.
*/
public AFServerSocket newForceBoundServerSocket() throws IOException {
AFServerSocket serverSocket = getAddressFamily().newServerSocket();
serverSocket.forceBindAddress(this).bind(this);
return serverSocket;
}
/**
* Tries to parse the given URI and return a corresponding {@link AFSocketAddress} for it.
*
* NOTE: Only certain URI schemes are supported, such as {@code unix://} (for
* {@link AFUNIXSocketAddress}) and {@code tipc://} for {@link AFTIPCSocketAddress}.
*
* @param u The URI.
* @return The address.
* @throws SocketException on error.
* @see AFAddressFamily#uriSchemes()
*/
@SuppressWarnings("PMD.ShortMethodName")
public static AFSocketAddress of(URI u) throws SocketException {
return of(u, -1);
}
/**
* Tries to parse the given URI and return a corresponding {@link AFSocketAddress} for it.
*
* NOTE: Only certain URI schemes are supported, such as {@code unix://} (for
* {@link AFUNIXSocketAddress}) and {@code tipc://} for {@link AFTIPCSocketAddress}.
*
* @param u The URI.
* @param overridePort The port to forcibly use, or {@code -1} for "don't override".
* @return The address.
* @throws SocketException on error.
* @see AFAddressFamily#uriSchemes()
*/
@SuppressWarnings("PMD.ShortMethodName")
public static AFSocketAddress of(URI u, int overridePort) throws SocketException {
AFAddressFamily af = AFAddressFamily.getAddressFamily(u);
if (af == null) {
throw new SocketException("Cannot resolve AFSocketAddress from URI scheme: " + u.getScheme());
}
return af.parseURI(u, overridePort);
}
/**
* Tries to create a URI based on this {@link AFSocketAddress}.
*
* @param scheme The target scheme.
* @param template An optional template to reuse certain parameters (e.g., the "path" component
* for an {@code http} request), or {@code null}.
* @return The URI.
* @throws IOException on error.
*/
public URI toURI(String scheme, URI template) throws IOException {
throw new IOException("Unsupported operation");
}
/**
* Returns a address string that can be used with {@code socat}'s {@code SOCKET-CONNECT},
* {@code SOCKET-LISTEN}, {@code SOCKET-DATAGRAM}, etc., address types, or {@code null} if the
* address type is not natively supported by this platform.
*
* This call is mostly suited for debugging purposes. The resulting string is specific to the
* platform the code is executed on, and thus may be different among platforms.
*
* @param socketType The socket type, or {@code null} to omit from string.
* @param socketProtocol The socket protocol, or {@code null} to omit from string.
* @return The string (such as 1:0:x2f746d702f796f).
* @throws IOException on error (a {@link SocketException} is thrown if the native address cannot
* be accessed).
*/
public @Nullable @SuppressWarnings("PMD.NPathComplexity") String toSocatAddressString(
AFSocketType socketType, AFSocketProtocol socketProtocol) throws IOException {
if (SOCKADDR_NATIVE_FAMILY_OFFSET == -1 || SOCKADDR_NATIVE_DATA_OFFSET == -1) {
return null;
}
if (nativeAddress == null) {
throw (SocketException) new SocketException("Cannot access native address").initCause(
NativeUnixSocket.unsupportedException());
}
if (socketProtocol != null && socketProtocol.getId() != 0) {
throw new IOException("Protocol not (yet) supported"); // FIXME support additional protocols
}
int family = (nativeAddress.get(SOCKADDR_NATIVE_FAMILY_OFFSET) & 0xFF);
int type = socketType == null ? -1 : NativeUnixSocket.sockTypeToNative(socketType.getId());
StringBuilder sb = new StringBuilder();
sb.append(family);
if (type != -1) {
sb.append(':');
sb.append(type);
}
if (socketProtocol != null) {
sb.append(':');
sb.append(socketProtocol.getId()); // FIXME needs native conversion
}
sb.append(":x");
int n = nativeAddress.limit();
while (n > 1 && nativeAddress.get(n - 1) == 0) {
n--;
}
for (int pos = SOCKADDR_NATIVE_DATA_OFFSET; pos < n; pos++) {
byte b = nativeAddress.get(pos);
sb.append(String.format(Locale.ENGLISH, "%02x", b));
}
return sb.toString();
}
/**
* Checks if the given address could cover another address.
*
* By default, this is only true if both addresses are regarded equal using
* {@link #equals(Object)}.
*
* However, implementations may support "wildcard" addresses, and this method would compare a
* wildcard address against some non-wildcard address, for example.
*
* @param other The other address that could be covered by this address.
* @return {@code true} if the other address could be covered.
*/
public boolean covers(AFSocketAddress other) {
return this.equals(other);
}
/**
* Custom serialization: Reference {@link AFAddressFamily} instance by identifier string.
*
* @param in The {@link ObjectInputStream}.
* @throws ClassNotFoundException on error.
* @throws IOException on error.
*/
@SuppressFBWarnings("MC_OVERRIDABLE_METHOD_CALL_IN_READ_OBJECT") // https://github.com/spotbugs/spotbugs/issues/2957
private void readObject(ObjectInputStream in) throws ClassNotFoundException, IOException {
in.defaultReadObject();
String af = in.readUTF();
if ("undefined".equals(af)) {
this.addressFamily = null;
} else {
this.addressFamily = Objects.requireNonNull(AFAddressFamily.getAddressFamily(af),
"address family");
}
}
/**
* Custom serialization: Reference {@link AFAddressFamily} instance by identifier string.
*
* @param out The {@link ObjectOutputStream}.
* @throws IOException on error.
*/
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
out.writeUTF(addressFamily == null ? "undefined" : addressFamily.getJuxString());
}
/**
* Returns a string representation of the argument as an unsigned decimal value.
*
* Works like {@link Integer#toUnsignedString(int)}; added to allow execution on Java 1.7.
*
* @param i The value.
* @return The string.
*/
static String toUnsignedString(int i) {
return Long.toString(toUnsignedLong(i));
}
/**
* Returns a string representation of the first argument as an unsigned integer value in the radix
* specified by the second argument; added to allow execution on Java 1.7.
*
* @param i The value.
* @param radix The radix.
* @return The string.
*/
static String toUnsignedString(int i, int radix) {
return Long.toUnsignedString(toUnsignedLong(i), radix);
}
private static long toUnsignedLong(long x) {
return x & 0xffffffffL;
}
/**
* Parses the string argument as an unsigned integer in the radix specified by the second
* argument. Works like {@link Integer#parseUnsignedInt(String, int)}; added to allow execution on
* Java 1.7.
*
* @param s The string.
* @param radix The radix.
* @return The integer.
* @throws NumberFormatException on parse error.
*/
protected static int parseUnsignedInt(String s, int radix) throws NumberFormatException {
if (s == null || s.isEmpty()) {
throw new NumberFormatException("Cannot parse null or empty string");
}
int len = s.length();
if (s.startsWith("-")) {
throw new NumberFormatException("Illegal leading minus sign on unsigned string " + s);
}
if (len <= 5 || (radix == 10 && len <= 9)) {
return Integer.parseInt(s, radix);
} else {
long ell = Long.parseLong(s, radix);
if ((ell & 0xffff_ffff_0000_0000L) == 0) {
return (int) ell;
} else {
throw new NumberFormatException("String value exceeds " + "range of unsigned int: " + s);
}
}
}
/**
* Checks if the given {@link SocketAddress} can be mapped to an {@link AFSocketAddress}. This is
* the case if the address either already is an {@link AFSocketAddress}, {@code null}, or
* something that has an equivalent representation, such as {@code UnixDomainSocketAddress}.
*
* @param addr The address.
* @return {@code true} if mappable.
*/
public static boolean canMap(SocketAddress addr) {
return canMap(addr, AFSocketAddress.class);
}
/**
* Checks if the given {@link SocketAddress} can be mapped to a specific {@link AFSocketAddress}
* subclass. This is the case if the address either already is such an {@link AFSocketAddress},
* {@code null}, or something that has an equivalent representation, such as
* {@code UnixDomainSocketAddress}.
*
* @param addr The address.
* @param targetAddressClass The target address class to map to.
* @return {@code true} if mappable.
*/
public static boolean canMap(SocketAddress addr,
Class targetAddressClass) {
if (addr == null) {
return true;
} else if (targetAddressClass.isAssignableFrom(addr.getClass())) {
return true;
}
AFSupplier supplier = SocketAddressUtil.supplyAFSocketAddress(addr);
if (supplier == null) {
return false;
}
AFSocketAddress afAddr = supplier.get();
if (afAddr == null) {
return false;
}
return (targetAddressClass.isAssignableFrom(afAddr.getClass()));
}
/**
* Maps the given address to an {@link AFSocketAddress}.
*
* @param addr The address.
* @return The {@link AFSocketAddress}.
* @throws IllegalArgumentException if the address could not be mapped.
* @see #canMap(SocketAddress,Class)
*/
public static AFSocketAddress mapOrFail(SocketAddress addr) {
return mapOrFail(addr, AFSocketAddress.class);
}
/**
* Maps the given address to a specific {@link AFSocketAddress} type.
*
* @param addr The address.
* @param targetAddressClass The target address class.
* @param The target address type.
* @return The {@link AFSocketAddress}.
* @throws IllegalArgumentException if the address could not be mapped.
* @see #canMap(SocketAddress,Class)
*/
@SuppressWarnings("null")
public static A mapOrFail(SocketAddress addr,
Class targetAddressClass) {
if (addr == null) {
return null;
} else if (targetAddressClass.isAssignableFrom(addr.getClass())) {
return targetAddressClass.cast(addr);
}
AFSupplier supplier = SocketAddressUtil.supplyAFSocketAddress(addr);
if (supplier == null) {
throw new IllegalArgumentException("Can only bind to endpoints of type "
+ AFSocketAddress.class.getName() + ": " + addr);
}
AFSocketAddress afAddr = supplier.get();
if (afAddr == null || !targetAddressClass.isAssignableFrom(afAddr.getClass())) {
throw new IllegalArgumentException("Can only bind to endpoints of type "
+ AFSocketAddress.class.getName() + ", and this specific address is unsupported: "
+ addr);
}
return targetAddressClass.cast(afAddr);
}
}
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