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MySQL JDBC Type 4 driver
/*
Copyright (c) 2002, 2012, Oracle and/or its affiliates. All rights reserved.
The MySQL Connector/J is licensed under the terms of the GPLv2
, like most MySQL Connectors.
There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
this software, see the FLOSS License Exception
.
This program is free software; you can redistribute it and/or modify it under the terms
of the GNU General Public License as published by the Free Software Foundation; version 2
of the License.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along with this
program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.jdbc;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.InetAddress;
import java.net.Socket;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;
/**
* Socket factory for vanilla TCP/IP sockets (the standard)
*
* @author Mark Matthews
*/
public class StandardSocketFactory implements SocketFactory, SocketMetadata {
public static final String TCP_NO_DELAY_PROPERTY_NAME = "tcpNoDelay";
public static final String TCP_KEEP_ALIVE_DEFAULT_VALUE = "true";
public static final String TCP_KEEP_ALIVE_PROPERTY_NAME = "tcpKeepAlive";
public static final String TCP_RCV_BUF_PROPERTY_NAME = "tcpRcvBuf";
public static final String TCP_SND_BUF_PROPERTY_NAME = "tcpSndBuf";
public static final String TCP_TRAFFIC_CLASS_PROPERTY_NAME = "tcpTrafficClass";
public static final String TCP_RCV_BUF_DEFAULT_VALUE = "0";
public static final String TCP_SND_BUF_DEFAULT_VALUE = "0";
public static final String TCP_TRAFFIC_CLASS_DEFAULT_VALUE = "0";
public static final String TCP_NO_DELAY_DEFAULT_VALUE = "true";
/** Use reflection for pre-1.4 VMs */
private static Method setTraficClassMethod;
static {
try {
setTraficClassMethod = Socket.class.getMethod("setTrafficClass",
new Class[] { Integer.TYPE });
} catch (SecurityException e) {
setTraficClassMethod = null;
} catch (NoSuchMethodException e) {
setTraficClassMethod = null;
}
}
/** The hostname to connect to */
protected String host = null;
/** The port number to connect to */
protected int port = 3306;
/** The underlying TCP/IP socket to use */
protected Socket rawSocket = null;
/**
* Called by the driver after issuing the MySQL protocol handshake and
* reading the results of the handshake.
*
* @throws SocketException
* if a socket error occurs
* @throws IOException
* if an I/O error occurs
*
* @return The socket to use after the handshake
*/
public Socket afterHandshake() throws SocketException, IOException {
return this.rawSocket;
}
/**
* Called by the driver before issuing the MySQL protocol handshake. Should
* return the socket instance that should be used during the handshake.
*
* @throws SocketException
* if a socket error occurs
* @throws IOException
* if an I/O error occurs
*
* @return the socket to use before the handshake
*/
public Socket beforeHandshake() throws SocketException, IOException {
return this.rawSocket;
}
/**
* Configures socket properties based on properties from the connection
* (tcpNoDelay, snd/rcv buf, traffic class, etc).
*
* @param props
* @throws SocketException
* @throws IOException
*/
private void configureSocket(Socket sock, Properties props) throws SocketException,
IOException {
try {
sock.setTcpNoDelay(Boolean.valueOf(
props.getProperty(TCP_NO_DELAY_PROPERTY_NAME,
TCP_NO_DELAY_DEFAULT_VALUE)).booleanValue());
String keepAlive = props.getProperty(TCP_KEEP_ALIVE_PROPERTY_NAME,
TCP_KEEP_ALIVE_DEFAULT_VALUE);
if (keepAlive != null && keepAlive.length() > 0) {
sock.setKeepAlive(Boolean.valueOf(keepAlive)
.booleanValue());
}
int receiveBufferSize = Integer.parseInt(props.getProperty(
TCP_RCV_BUF_PROPERTY_NAME, TCP_RCV_BUF_DEFAULT_VALUE));
if (receiveBufferSize > 0) {
sock.setReceiveBufferSize(receiveBufferSize);
}
int sendBufferSize = Integer.parseInt(props.getProperty(
TCP_SND_BUF_PROPERTY_NAME, TCP_SND_BUF_DEFAULT_VALUE));
if (sendBufferSize > 0) {
sock.setSendBufferSize(sendBufferSize);
}
int trafficClass = Integer.parseInt(props.getProperty(
TCP_TRAFFIC_CLASS_PROPERTY_NAME,
TCP_TRAFFIC_CLASS_DEFAULT_VALUE));
if (trafficClass > 0 && setTraficClassMethod != null) {
setTraficClassMethod.invoke(sock,
new Object[] { Integer.valueOf(trafficClass) });
}
} catch (Throwable t) {
unwrapExceptionToProperClassAndThrowIt(t);
}
}
/**
* @see com.mysql.jdbc.SocketFactory#createSocket(Properties)
*/
public Socket connect(String hostname, int portNumber, Properties props)
throws SocketException, IOException {
if (props != null) {
this.host = hostname;
this.port = portNumber;
Method connectWithTimeoutMethod = null;
Method socketBindMethod = null;
Class socketAddressClass = null;
String localSocketHostname = props
.getProperty("localSocketAddress");
String connectTimeoutStr = props.getProperty("connectTimeout");
int connectTimeout = 0;
boolean wantsTimeout = (connectTimeoutStr != null
&& connectTimeoutStr.length() > 0 && !connectTimeoutStr
.equals("0"));
boolean wantsLocalBind = (localSocketHostname != null && localSocketHostname
.length() > 0);
boolean needsConfigurationBeforeConnect = socketNeedsConfigurationBeforeConnect(props);
if (wantsTimeout || wantsLocalBind || needsConfigurationBeforeConnect) {
if (connectTimeoutStr != null) {
try {
connectTimeout = Integer.parseInt(connectTimeoutStr);
} catch (NumberFormatException nfe) {
throw new SocketException("Illegal value '"
+ connectTimeoutStr + "' for connectTimeout");
}
}
try {
// Have to do this with reflection, otherwise older JVMs
// croak
socketAddressClass = Class
.forName("java.net.SocketAddress");
connectWithTimeoutMethod = Socket.class.getMethod(
"connect", new Class[] { socketAddressClass,
Integer.TYPE });
socketBindMethod = Socket.class.getMethod("bind",
new Class[] { socketAddressClass });
} catch (NoClassDefFoundError noClassDefFound) {
// ignore, we give a better error below if needed
} catch (NoSuchMethodException noSuchMethodEx) {
// ignore, we give a better error below if needed
} catch (Throwable catchAll) {
// ignore, we give a better error below if needed
}
if (wantsLocalBind && socketBindMethod == null) {
throw new SocketException(
"Can't specify \"localSocketAddress\" on JVMs older than 1.4");
}
if (wantsTimeout && connectWithTimeoutMethod == null) {
throw new SocketException(
"Can't specify \"connectTimeout\" on JVMs older than 1.4");
}
}
if (this.host != null) {
if (!(wantsLocalBind || wantsTimeout || needsConfigurationBeforeConnect)) {
InetAddress[] possibleAddresses = InetAddress
.getAllByName(this.host);
Throwable caughtWhileConnecting = null;
// Need to loop through all possible addresses, in case
// someone has IPV6 configured (SuSE, for example...)
for (int i = 0; i < possibleAddresses.length; i++) {
try {
this.rawSocket = new Socket(possibleAddresses[i],
port);
configureSocket(this.rawSocket, props);
break;
} catch (Exception ex) {
caughtWhileConnecting = ex;
}
}
if (rawSocket == null) {
unwrapExceptionToProperClassAndThrowIt(caughtWhileConnecting);
}
} else {
// must explicitly state this due to classloader issues
// when running on older JVMs :(
try {
InetAddress[] possibleAddresses = InetAddress
.getAllByName(this.host);
Throwable caughtWhileConnecting = null;
Object localSockAddr = null;
Class inetSocketAddressClass = null;
Constructor addrConstructor = null;
try {
inetSocketAddressClass = Class
.forName("java.net.InetSocketAddress");
addrConstructor = inetSocketAddressClass
.getConstructor(new Class[] {
InetAddress.class, Integer.TYPE });
if (wantsLocalBind) {
localSockAddr = addrConstructor
.newInstance(new Object[] {
InetAddress
.getByName(localSocketHostname),
new Integer(0 /*
* use ephemeral
* port
*/) });
}
} catch (Throwable ex) {
unwrapExceptionToProperClassAndThrowIt(ex);
}
// Need to loop through all possible addresses, in case
// someone has IPV6 configured (SuSE, for example...)
for (int i = 0; i < possibleAddresses.length; i++) {
try {
this.rawSocket = new Socket();
configureSocket(this.rawSocket, props);
Object sockAddr = addrConstructor
.newInstance(new Object[] {
possibleAddresses[i],
Integer.valueOf(port) });
// bind to the local port if not using the ephemeral port
if (localSockAddr != null) {
socketBindMethod.invoke(rawSocket,
new Object[] { localSockAddr });
}
connectWithTimeoutMethod.invoke(rawSocket,
new Object[] { sockAddr,
Integer.valueOf(connectTimeout) });
break;
} catch (Exception ex) {
this.rawSocket = null;
caughtWhileConnecting = ex;
}
}
if (this.rawSocket == null) {
unwrapExceptionToProperClassAndThrowIt(caughtWhileConnecting);
}
} catch (Throwable t) {
unwrapExceptionToProperClassAndThrowIt(t);
}
}
return this.rawSocket;
}
}
throw new SocketException("Unable to create socket");
}
/**
* Does the configureSocket() need to be called before the socket is
* connect()d based on the properties supplied?
*
*/
private boolean socketNeedsConfigurationBeforeConnect(Properties props) {
int receiveBufferSize = Integer.parseInt(props.getProperty(
TCP_RCV_BUF_PROPERTY_NAME, TCP_RCV_BUF_DEFAULT_VALUE));
if (receiveBufferSize > 0) {
return true;
}
int sendBufferSize = Integer.parseInt(props.getProperty(
TCP_SND_BUF_PROPERTY_NAME, TCP_SND_BUF_DEFAULT_VALUE));
if (sendBufferSize > 0) {
return true;
}
int trafficClass = Integer.parseInt(props.getProperty(
TCP_TRAFFIC_CLASS_PROPERTY_NAME,
TCP_TRAFFIC_CLASS_DEFAULT_VALUE));
if (trafficClass > 0 && setTraficClassMethod != null) {
return true;
}
return false;
}
private void unwrapExceptionToProperClassAndThrowIt(
Throwable caughtWhileConnecting) throws SocketException,
IOException {
if (caughtWhileConnecting instanceof InvocationTargetException) {
// Replace it with the target, don't use 1.4 chaining as this still
// needs to run on older VMs
caughtWhileConnecting = ((InvocationTargetException) caughtWhileConnecting)
.getTargetException();
}
if (caughtWhileConnecting instanceof SocketException) {
throw (SocketException) caughtWhileConnecting;
}
if (caughtWhileConnecting instanceof IOException) {
throw (IOException) caughtWhileConnecting;
}
throw new SocketException(caughtWhileConnecting.toString());
}
public boolean isLocallyConnected(com.mysql.jdbc.ConnectionImpl conn) throws SQLException {
long threadId = conn.getId();
java.sql.Statement processListStmt = conn.getMetadataSafeStatement();
ResultSet rs = null;
try {
String processHost = null;
rs = processListStmt.executeQuery("SHOW PROCESSLIST");
while (rs.next()) {
long id = rs.getLong(1);
if (threadId == id) {
processHost = rs.getString(3);
break;
}
}
if (processHost != null) {
if (processHost.indexOf(":") != -1) {
processHost = processHost.split(":")[0];
try {
boolean isLocal;
isLocal = InetAddress.getByName(processHost).equals(
rawSocket.getLocalAddress());
return isLocal;
} catch (UnknownHostException e) {
conn.getLog().logWarn(Messages.getString("Connection.CantDetectLocalConnect", new Object[] {host}), e);
return false;
}
}
}
return false;
} finally {
processListStmt.close();
}
}
}