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JDBC driver for MariaDB and MySQL
/*
MariaDB Client for Java
Copyright (c) 2012-2014 Monty Program Ab.
Copyright (c) 2015-2016 MariaDB Ab.
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free
Software Foundation; either version 2.1 of the License, or (at your option)
any later version.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
for more details.
You should have received a copy of the GNU Lesser General Public License along
with this library; if not, write to Monty Program Ab [email protected].
This particular MariaDB Client for Java file is work
derived from a Drizzle-JDBC. Drizzle-JDBC file which is covered by subject to
the following copyright and notice provisions:
Copyright (c) 2009-2011, Marcus Eriksson
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list
of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.
Neither the name of the driver nor the names of its contributors may not be
used to endorse or promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE.
*/
package org.mariadb.jdbc.internal.socket;
import com.sun.jna.*;
import com.sun.jna.platform.win32.BaseTSD.SIZE_T;
import com.sun.jna.platform.win32.WinNT.HANDLE;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.ptr.PointerByReference;
import com.sun.jna.win32.StdCallLibrary;
import com.sun.jna.win32.W32APIFunctionMapper;
import com.sun.jna.win32.W32APITypeMapper;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.SocketAddress;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
public class SharedMemorySocket extends Socket {
//SDDL string for mutex security flags (Everyone group has SYNCHRONIZE right)
public static final String EVERYONE_SYNCHRONIZE_SDDL = "D:(A;;0x100000;;;WD)";
static final Map WIN32API_OPTIONS = new HashMap() {
{
put(Library.OPTION_FUNCTION_MAPPER, W32APIFunctionMapper.UNICODE);
put(Library.OPTION_TYPE_MAPPER, W32APITypeMapper.UNICODE);
}
};
// Size of memory mapped region
static int BUFFERLEN = 16004;
InputStream is;
OutputStream os;
private String memoryName;
private HANDLE serverRead;
private HANDLE serverWrote;
private HANDLE clientRead;
private HANDLE clientWrote;
private HANDLE connectionClosed;
private Pointer view;
private int bytesLeft;
private int position;
private int timeout = Kernel32.INFINITE;
/**
* Create ShareMemorySocket.
* @param name name
* @throws IOException exception
*/
public SharedMemorySocket(String name) throws IOException {
if (!Platform.isWindows()) {
throw new IOException("shared memory connections are only supported on Windows");
}
memoryName = name;
}
public static HANDLE openEvent(String name) {
return Kernel32.INSTANCE.OpenEvent(Kernel32.EVENT_MODIFY_STATE | Kernel32.SYNCHRONIZE, false, name);
}
/**
* Map memory
* @param mapName map name
* @param mode mode
* @param size size
* @return Pointer
*/
public static Pointer mapMemory(String mapName, int mode, int size) {
HANDLE mapping = Kernel32.INSTANCE.OpenFileMapping(mode, false, mapName);
Pointer v = Kernel32.INSTANCE.MapViewOfFile(mapping, mode, 0, 0, new SIZE_T(size));
Kernel32.INSTANCE.CloseHandle(mapping);
return v;
}
@Override
public void connect(SocketAddress endpoint) throws IOException {
connect(endpoint, 0);
}
/*
Create a mutex to synchronize login. Without mutex, different connections that are created at about the same
time, could get the same connection number. Note, that this mutex, or any synchronization does not exist in
in either C or .NET connectors (i.e they are racy)
*/
private HANDLE lockMutex() throws IOException {
PointerByReference securityDescriptor = new PointerByReference();
Advapi32.INSTANCE.ConvertStringSecurityDescriptorToSecurityDescriptor(EVERYONE_SYNCHRONIZE_SDDL, 1, securityDescriptor, null);
Advapi32.SECURITY_ATTRIBUTES sa = new Advapi32.SECURITY_ATTRIBUTES();
sa.nLength = sa.size();
sa.lpSecurityDescriptor = securityDescriptor.getValue();
sa.bInheritHandle = false;
HANDLE mutex = Kernel32.INSTANCE.CreateMutex(sa, false, memoryName + "_CONNECT_MUTEX");
Kernel32.INSTANCE.LocalFree(securityDescriptor.getValue());
if (Kernel32.INSTANCE.WaitForSingleObject(mutex, timeout) == -1) {
Kernel32.INSTANCE.CloseHandle(mutex);
throw new IOException("wait failed (timeout, last error = " + Kernel32.INSTANCE.GetLastError());
}
return mutex;
}
public int getConnectNumber() throws IOException {
HANDLE connectRequest;
try {
connectRequest = openEvent(memoryName + "_CONNECT_REQUEST");
} catch (LastErrorException lee) {
try {
connectRequest = openEvent("Global\\" + memoryName + "_CONNECT_REQUEST");
memoryName = "Global\\" + memoryName;
} catch (LastErrorException lee2) {
throw new IOException("getConnectNumber() fails : " + lee2.getMessage() + " " + memoryName);
}
}
HANDLE connectAnswer = openEvent(memoryName + "_CONNECT_ANSWER");
HANDLE mutex = lockMutex();
Pointer connectData = null;
try {
Kernel32.INSTANCE.SetEvent(connectRequest);
connectData = mapMemory(memoryName + "_CONNECT_DATA", Kernel32.FILE_MAP_READ, 4);
int ret = Kernel32.INSTANCE.WaitForSingleObject(connectAnswer, timeout);
if (ret != 0) {
throw new IOException("WaitForSingleObject returned " + ret + ", last error " + Kernel32.INSTANCE.GetLastError());
}
int nr = connectData.getInt(0);
return nr;
} finally {
Kernel32.INSTANCE.ReleaseMutex(mutex);
Kernel32.INSTANCE.CloseHandle(mutex);
if (connectData != null) {
Kernel32.INSTANCE.UnmapViewOfFile(connectData);
}
Kernel32.INSTANCE.CloseHandle(connectRequest);
Kernel32.INSTANCE.CloseHandle(connectAnswer);
}
}
public void connect(SocketAddress endpoint, int timeout) throws IOException {
try {
is = new SharedMemoryInputStream();
os = new SharedMemoryOutputStream();
String prefix = memoryName + "_" + getConnectNumber();
clientRead = openEvent(prefix + "_CLIENT_READ");
serverRead = openEvent(prefix + "_SERVER_READ");
serverWrote = openEvent(prefix + "_SERVER_WROTE");
clientWrote = openEvent(prefix + "_CLIENT_WROTE");
connectionClosed = openEvent(prefix + "_CONNECTION_CLOSED");
view = mapMemory(prefix + "_DATA", Kernel32.FILE_MAP_WRITE, BUFFERLEN);
Kernel32.INSTANCE.SetEvent(serverRead);
} catch (LastErrorException lee) {
throw new IOException(lee.getMessage(), lee.getCause());
}
}
public InputStream getInputStream() {
return is;
}
public OutputStream getOutputStream() {
return os;
}
public void setTcpNoDelay(boolean b) {
}
public void setKeepAlive(boolean b) {
}
public void setReceiveBufferSize(int size) {
}
public void setSendBufferSize(int size) {
}
public void setSoLinger(boolean b, int i) {
}
public void setSoTimeout(int t) {
if (t == 0) {
timeout = Kernel32.INFINITE;
} else {
timeout = t;
}
}
public void shutdownInput() {
}
public void shutdownOutput() {
}
@Override
public void close() {
if (connectionClosed != null) {
/* Set close event if not yet set */
if (Kernel32.INSTANCE.WaitForSingleObject(connectionClosed, 0) != 0) {
Kernel32.INSTANCE.SetEvent(connectionClosed);
}
}
HANDLE[] handles = {serverRead, serverWrote, clientRead, clientWrote, connectionClosed};
for (HANDLE h : handles) {
if (h != null) {
Kernel32.INSTANCE.CloseHandle(h);
}
}
if (view != null) {
Kernel32.INSTANCE.UnmapViewOfFile(view);
}
serverRead = null;
serverWrote = null;
clientRead = null;
clientWrote = null;
connectionClosed = null;
view = null;
}
public interface Kernel32 extends StdCallLibrary {
public Kernel32 INSTANCE = (Kernel32) Native.loadLibrary("Kernel32", Kernel32.class, WIN32API_OPTIONS);
public static final int FILE_MAP_WRITE = 0x0002;
public static final int FILE_MAP_READ = 0x0004;
public static final int EVENT_MODIFY_STATE = 0x0002;
public static final int SYNCHRONIZE = 0x00100000;
public static final int INFINITE = -1;
public HANDLE OpenEvent(int dwDesiredAccess, boolean bInheritHandle, String name) throws LastErrorException;
public HANDLE OpenFileMapping(int dwDesiredAccess, boolean bInheritHandle, String name) throws LastErrorException;
public Pointer MapViewOfFile(HANDLE hFileMappingObject, int dwDesiredAccess, int dwFileOffsetHigh, int dwFileOffsetLow,
SIZE_T dwNumberOfBytesToMap) throws LastErrorException;
public boolean UnmapViewOfFile(Pointer view) throws LastErrorException;
public boolean SetEvent(HANDLE handle) throws LastErrorException;
public boolean CloseHandle(HANDLE handle) throws LastErrorException;
public int WaitForSingleObject(HANDLE handle, int timeout) throws LastErrorException;
public int WaitForMultipleObjects(int count, HANDLE[] handles, boolean waitAll, int millis) throws LastErrorException;
public int GetLastError() throws LastErrorException;
public HANDLE CreateMutex(Advapi32.SECURITY_ATTRIBUTES sa, boolean initialOwner, String name);
public boolean ReleaseMutex(HANDLE hMutex);
public Pointer LocalFree(Pointer p);
}
public interface Advapi32 extends StdCallLibrary {
public Advapi32 INSTANCE = (Advapi32) Native.loadLibrary("advapi32", Advapi32.class, WIN32API_OPTIONS);
boolean ConvertStringSecurityDescriptorToSecurityDescriptor(String sddl, int sddlVersion, PointerByReference psd,
IntByReference length);
public static class SECURITY_ATTRIBUTES extends Structure {
public int nLength;
public Pointer lpSecurityDescriptor;
public boolean bInheritHandle;
protected java.util.List getFieldOrder() {
return Arrays.asList(new String[]{"nLength", "lpSecurityDescriptor", "bInheritHandle"});
}
}
}
class SharedMemoryInputStream extends InputStream {
@Override
public int read(byte[] bytes, int off, int count) throws IOException {
HANDLE[] handles = {serverWrote, connectionClosed};
if (bytesLeft == 0) {
int index = Kernel32.INSTANCE.WaitForMultipleObjects(2, handles, false, timeout);
if (index == -1) {
throw new IOException("wait failed, timeout");
} else if (index == 1) {
// Connection closed
throw new IOException("Server closed connection");
} else if (index != 0) {
throw new IOException("Unexpected return result from WaitForMultipleObjects : " + index);
}
bytesLeft = view.getInt(0);
position = 4;
}
int len = Math.min(count, bytesLeft);
view.read(position, bytes, off, len);
position += len;
bytesLeft -= len;
if (bytesLeft == 0) {
Kernel32.INSTANCE.SetEvent(clientRead);
}
return len;
}
@Override
public int read() throws IOException {
byte[] bit = new byte[1];
int bytesRead = read(bit);
if (bytesRead == 0) {
return -1;
}
return bit[0] & 0xff;
}
@Override
public int read(byte[] bytes) throws IOException {
return read(bytes, 0, bytes.length);
}
}
class SharedMemoryOutputStream extends OutputStream {
@Override
public void write(byte[] bytes, int off, int count) throws IOException {
int bytesToWrite = count;
int buffPos = off;
HANDLE[] handles = {serverRead, connectionClosed};
while (bytesToWrite > 0) {
int index = Kernel32.INSTANCE.WaitForMultipleObjects(2, handles, false, timeout);
if (index == -1) {
// wait failed, probably timeout
throw new IOException("WaitForMultipleObjects() failed, timeout");
} else if (index == 1) {
// Connection closed
throw new IOException("Server closed connection");
} else if (index != 0) {
throw new IOException("Unexpected return result from WaitForMultipleObjects : " + index);
}
int chunk = Math.min(bytesToWrite, BUFFERLEN);
view.setInt(0, chunk);
view.write(4, bytes, buffPos, chunk);
buffPos += chunk;
bytesToWrite -= chunk;
if (!Kernel32.INSTANCE.SetEvent(clientWrote)) {
throw new IOException("SetEvent failed");
}
}
}
@Override
public void write(int value) throws IOException {
write(new byte[]{(byte) value});
}
@Override
public void write(byte[] bytes) throws IOException {
write(bytes, 0, bytes.length);
}
}
}
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