package sun.nio.ch;
import java.io.FileDescriptor;
import java.io.IOException;
import java.net.BindException;
import java.net.NetPermission;
import java.net.SocketAddress;
import java.net.UnixDomainSocketAddress;
import java.nio.channels.UnsupportedAddressTypeException;
import java.nio.file.FileSystems;
import java.nio.file.InvalidPathException;
import java.nio.file.Path;
import java.nio.file.spi.FileSystemProvider;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Random;
import sun.nio.fs.AbstractFileSystemProvider;
class UnixDomainSockets {
private UnixDomainSockets() { }
static final UnixDomainSocketAddress UNNAMED = UnixDomainSocketAddress.of("");
private static final boolean supported;
private static final String tempDir = UnixDomainSocketsUtil.getTempDir();
private static final NetPermission accessUnixDomainSocket =
new NetPermission("accessUnixDomainSocket");
static boolean isSupported() {
return supported;
}
static void checkPermission() {
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkPermission(accessUnixDomainSocket);
}
static UnixDomainSocketAddress getRevealedLocalAddress(SocketAddress sa) {
UnixDomainSocketAddress addr = (UnixDomainSocketAddress) sa;
try {
checkPermission();
} catch (SecurityException e) {
addr = UNNAMED;
}
return addr;
}
static UnixDomainSocketAddress localAddress(FileDescriptor fd) throws IOException {
String path = new String(localAddress0(fd), UnixDomainSocketsUtil.getCharset());
return UnixDomainSocketAddress.of(path);
}
private static native byte[] localAddress0(FileDescriptor fd) throws IOException;
static String getRevealedLocalAddressAsString(SocketAddress sa) {
return (System.getSecurityManager() != null) ? sa.toString() : "";
}
static UnixDomainSocketAddress checkAddress(SocketAddress sa) {
if (sa == null)
throw new NullPointerException();
if (!(sa instanceof UnixDomainSocketAddress))
throw new UnsupportedAddressTypeException();
return (UnixDomainSocketAddress) sa;
}
static byte[] getPathBytes(Path path) {
FileSystemProvider provider = FileSystems.getDefault().provider();
return ((AbstractFileSystemProvider) provider).getSunPathForSocketFile(path);
}
static FileDescriptor socket() throws IOException {
return IOUtil.newFD(socket0());
}
static void bind(FileDescriptor fd, Path addr) throws IOException {
byte[] path = getPathBytes(addr);
if (path.length == 0) {
throw new BindException("Server socket cannot bind to unnamed address");
}
bind0(fd, path);
}
private static Random getRandom() {
try {
return SecureRandom.getInstance("NativePRNGNonBlocking");
} catch (NoSuchAlgorithmException e) {
return new SecureRandom();
}
}
private static final Random random = getRandom();
static UnixDomainSocketAddress generateTempName() throws IOException {
String dir = UnixDomainSockets.tempDir;
if (dir == null)
throw new BindException("Could not locate temporary directory for sockets");
int rnd = random.nextInt(Integer.MAX_VALUE);
try {
Path path = Path.of(dir, "socket_" + rnd);
return UnixDomainSocketAddress.of(path);
} catch (InvalidPathException e) {
throw new BindException("Invalid temporary directory");
}
}
static int connect(FileDescriptor fd, SocketAddress sa) throws IOException {
return UnixDomainSockets.connect(fd, ((UnixDomainSocketAddress) sa).getPath());
}
static int connect(FileDescriptor fd, Path path) throws IOException {
return connect0(fd, getPathBytes(path));
}
static int accept(FileDescriptor fd, FileDescriptor newfd, String[] paths)
throws IOException
{
Object[] array = new Object[1];
int n = accept0(fd, newfd, array);
if (n > 0) {
byte[] bytes = (byte[]) array[0];
paths[0] = new String(bytes, UnixDomainSocketsUtil.getCharset());
}
return n;
}
private static native boolean socketSupported();
private static native int socket0() throws IOException;
private static native void bind0(FileDescriptor fd, byte[] path)
throws IOException;
private static native int connect0(FileDescriptor fd, byte[] path)
throws IOException;
private static native int accept0(FileDescriptor fd, FileDescriptor newfd, Object[] array)
throws IOException;
static {
IOUtil.load();
supported = socketSupported();
}
}