ローカル プロキシ サーバーを使用して、RMI トラフィックを HTTP 経由で Web サーバーにトンネリングしています。
私の Proxyserver は jProxy ( http://jproxy.sourceforge.net/ ) のものです。
RMI アプリケーション内で実行するように変更し、トラフィックをリッスンして Web サーバーのポート 80 に転送し、再び戻します。
このトンネルを処理するために、TunnelSocket を使用しています。
以下の投稿コード：
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.InetAddress;
import java.net.Socket;
/**
* Socket that tunnels through a proxy by using the CONNECT command.
* <P>
* To connect to <CODE>bar.foo.com</CODE>, port 1234, through the proxy
* <CODE>evilproxy.mydomain.com</CODE> this socket implementation will sent an
* initial plain text line to the proxy of the form
* <P>
* <CENTER><CODE>CONNECT bar.foo.com:1234 HTTP/1.0</CODE></CENTER>
* <P>
* and if all goes well the proxy will respond <CENTER>
* <CODE>HTTP/1.0 200 OK</CODE></CENTER>
* <P>
* Hereafter, all that is sent to the proxy will be forwarded to the remote
* host, and all that the remote host returns will be forwarded to this socket.
*/
public class TunnelSocket extends Socket {
/**
*
*/
public TunnelSocket(String proxyHost, int proxyPort, InetAddress remoteAddress, int remotePort) throws IOException {
this(proxyHost, proxyPort, remoteAddress.getHostName(), remotePort);
}
/**
*
*/
public TunnelSocket(String proxyHost, int proxyPort, InetAddress remoteAddress, int remotePort,
InetAddress localAddress, int localPort) throws IOException {
this(proxyHost, proxyPort, remoteAddress.getHostName(), remotePort, localAddress, localPort);
}
/**
*
*/
public TunnelSocket(String proxyHost, int proxyPort, String remoteHost, int remotePort) throws IOException {
super(proxyHost, proxyPort);
tunnel(remoteHost, remotePort);
}
/**
*
*/
public TunnelSocket(String proxyHost, int proxyPort, String remoteHost, int remotePort, InetAddress localAddress,
int localPort) throws IOException {
super(proxyHost, proxyPort, localAddress, localPort);
tunnel(remoteHost, remotePort);
}
/**
*
*/
private void tunnel(String remoteHost, int remotePort) throws IOException {
OutputStream output = getOutputStream();
InputStream input = getInputStream();
String msg = "CONNECT " + remoteHost + ":" + remotePort + " HTTP/1.0\n" + "User-Agent: "
+ sun.net.www.protocol.http.HttpURLConnection.userAgent + "\r\n\r\n";
byte b[];
try {
b = msg.getBytes("ASCII7");
} catch (UnsupportedEncodingException ignored) {
b = msg.getBytes();
}
output.write(b);
output.flush();
byte[] reply = new byte[200];
int replyLen = 0;
int newlinesSeen = 0;
boolean headerDone = false;
boolean error = false;
while (newlinesSeen < 2) {
int i = input.read();
if (i < 0) {
throw new IOException("Unexpected EOF from proxy");
}
if (i == '\n') {
headerDone = true;
newlinesSeen++;
} else if (i != '\r') {
newlinesSeen = 0;
if (!headerDone && replyLen < reply.length) {
reply[replyLen++] = (byte) i;
}
}
}
String replyStr;
try {
replyStr = new String(reply, 0, replyLen, "ASCII7");
} catch (UnsupportedEncodingException ignored) {
replyStr = new String(reply, 0, replyLen);
}
if (!replyStr.startsWith("HTTP/1.0 200")) {
throw new IOException("Unable to tunnel. " + "Proxy returns \"" + replyStr + "\"");
}
}
}
このコードは、Web サーバーとプロキシ間の接続を確立します。
そして、ここに私の jProxy.java コードがあります:
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import org.apache.log4j.Logger;
public class jProxy extends Thread
{
public static final int DEFAULT_PORT = 8080;
private ServerSocket server = null;
private int thisPort = DEFAULT_PORT;
private String fwdServer = "";
private int fwdPort = 0;
private int ptTimeout = ProxyThread.DEFAULT_TIMEOUT;
private int debugLevel = 3;
private PrintStream debugOut = System.out;
private Logger log;
/* the proxy server just listens for connections and creates
* a new thread for each connection attempt (the ProxyThread
* class really does all the work)
*/
public jProxy (int port)
{
thisPort = port;
}
public jProxy (int port, String proxyServer, int proxyPort)
{
thisPort = port;
fwdServer = proxyServer;
fwdPort = proxyPort;
}
public jProxy (int port, String proxyServer, int proxyPort, int timeout)
{
thisPort = port;
fwdServer = proxyServer;
fwdPort = proxyPort;
ptTimeout = timeout;
}
/* allow the user to decide whether or not to send debug
* output to the console or some other PrintStream
*/
public void setDebug (int level, PrintStream out)
{
debugLevel = level;
debugOut = out;
}
/* get the port that we're supposed to be listening on
*/
public int getPort ()
{
return thisPort;
}
/* return whether or not the socket is currently open
*/
public boolean isRunning ()
{
if (server == null)
return false;
else
return true;
}
/* closeSocket will close the open ServerSocket; use this
* to halt a running jProxy thread
*/
public void closeSocket ()
{
try {
// close the open server socket
server.close();
// send it a message to make it stop waiting immediately
// (not really necessary)
/*Socket s = new Socket("localhost", thisPort);
OutputStream os = s.getOutputStream();
os.write((byte)0);
os.close();
s.close();*/
} catch(Exception e) {
if (debugLevel > 0)
debugOut.println(e);
}
server = null;
}
public void run()
{
try {
// create a server socket, and loop forever listening for
// client connections
server = new ServerSocket(thisPort);
if (debugLevel > 0)
debugOut.println("Started jProxy on port " + thisPort);
while (true)
{
Socket client = server.accept();
ProxyThread t = new ProxyThread(client);
t.setDebug(debugLevel, debugOut);
t.setTimeout(ptTimeout);
t.start();
}
} catch (Exception e) {
if (debugLevel > 0)
debugOut.println("jProxy Thread error: " + e);
}
closeSocket();
}
}
そして ProxyThread.java コード:
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.lang.reflect.Array;
import java.net.Socket;
import org.apache.log4j.Logger;
class ProxyThread extends Thread {
private Socket pSocket;
private String fwdServer = "";
private int fwdPort = 0;
private int debugLevel = 0;
private PrintStream debugOut = System.out;
private Logger log;
// the socketTimeout is used to time out the connection to
// the remote server after a certain period of inactivity;
// the value is in milliseconds -- use zero if you don't want
// a timeout
public static final int DEFAULT_TIMEOUT = 20 * 1000;
private int socketTimeout = DEFAULT_TIMEOUT;
public ProxyThread(Socket s) {
pSocket = s;
}
public ProxyThread(Socket s, String proxy, int port) {
pSocket = s;
fwdServer = proxy;
fwdPort = port;
}
public void setTimeout(int timeout) {
// assume that the user will pass the timeout value
// in seconds (because that's just more intuitive)
socketTimeout = timeout * 1000;
}
public void setDebug(int level, PrintStream out) {
debugLevel = level;
debugOut = out;
}
public void run() {
try {
long startTime = System.currentTimeMillis();
// client streams (make sure you're using streams that use
// byte arrays, so things like GIF and JPEG files and file
// downloads will transfer properly)
BufferedInputStream clientIn = new BufferedInputStream(pSocket.getInputStream());
BufferedOutputStream clientOut = new BufferedOutputStream(pSocket.getOutputStream());
// the socket to the remote server
Socket server = null;
// other variables
byte[] request = null;
byte[] response = null;
int requestLength = 0;
int responseLength = 0;
int pos = -1;
StringBuffer host = new StringBuffer("xx.xxx.xxx.xxx");
String hostName = "";
int hostPort = 80;
// get the header info (the web browser won't disconnect after
// it's sent a request, so make sure the waitForDisconnect
// parameter is false)
request = getHTTPData(clientIn, host, false);
requestLength = Array.getLength(request);
// separate the host name from the host port, if necessary
// (like if it's "servername:8000")
hostName = host.toString();
pos = hostName.indexOf(":");
if (pos > 0) {
try {
hostPort = Integer.parseInt(hostName.substring(pos + 1));
} catch (Exception e) {
}
hostName = hostName.substring(0, pos);
}
// either forward this request to another proxy server or
// send it straight to the Host
try {
if ((fwdServer.length() > 0) && (fwdPort > 0)) {
server = new Socket(fwdServer, fwdPort);
} else {
server = new Socket(hostName, hostPort);
}
} catch (Exception e) {
// tell the client there was an error
String errMsg = "HTTP/1.0 500\nContent Type: text/plain\n\n" + "Error connecting to the server:\n" + e + "\n";
clientOut.write(errMsg.getBytes(), 0, errMsg.length());
}
if (server != null) {
server.setSoTimeout(socketTimeout);
BufferedInputStream serverIn = new BufferedInputStream(server.getInputStream());
BufferedOutputStream serverOut = new BufferedOutputStream(server.getOutputStream());
// send the request out
serverOut.write(request, 0, requestLength);
serverOut.flush();
// and get the response; if we're not at a debug level that
// requires us to return the data in the response, just stream
// it back to the client to save ourselves from having to
// create and destroy an unnecessary byte array. Also, we
// should set the waitForDisconnect parameter to 'true',
// because some servers (like Google) don't always set the
// Content-Length header field, so we have to listen until
// they decide to disconnect (or the connection times out).
if (debugLevel > 1) {
response = getHTTPData(serverIn, true);
responseLength = Array.getLength(response);
} else {
responseLength = streamHTTPData(serverIn, clientOut, true);
}
serverIn.close();
serverOut.close();
}
// send the response back to the client, if we haven't already
if (debugLevel > 1)
clientOut.write(response, 0, responseLength);
// if the user wants debug info, send them debug info; however,
// keep in mind that because we're using threads, the output won't
// necessarily be synchronous
if (debugLevel > 0) {
long endTime = System.currentTimeMillis();
debugOut.println("Request from " + pSocket.getInetAddress().getHostAddress() + " on Port "
+ pSocket.getLocalPort() + " to host " + hostName + ":" + hostPort + "\n (" + requestLength
+ " bytes sent, " + responseLength + " bytes returned, " + Long.toString(endTime - startTime)
+ " ms elapsed)");
debugOut.flush();
}
if (debugLevel > 1) {
debugOut.println("REQUEST:\n" + (new String(request)));
debugOut.println("RESPONSE:\n" + (new String(response)));
debugOut.flush();
}
// close all the client streams so we can listen again
clientOut.close();
clientIn.close();
pSocket.close();
} catch (Exception e) {
if (debugLevel > 0)
debugOut.println("Error in ProxyThread: " + e);
e.printStackTrace();
}
}
private byte[] getHTTPData(InputStream in, boolean waitForDisconnect) {
// get the HTTP data from an InputStream, and return it as
// a byte array
// the waitForDisconnect parameter tells us what to do in case
// the HTTP header doesn't specify the Content-Length of the
// transmission
StringBuffer foo = new StringBuffer("");
return getHTTPData(in, foo, waitForDisconnect);
}
private byte[] getHTTPData(InputStream in, StringBuffer host, boolean waitForDisconnect) {
// get the HTTP data from an InputStream, and return it as
// a byte array, and also return the Host entry in the header,
// if it's specified -- note that we have to use a StringBuffer
// for the 'host' variable, because a String won't return any
// information when it's used as a parameter like that
ByteArrayOutputStream bs = new ByteArrayOutputStream();
streamHTTPData(in, bs, host, waitForDisconnect);
return bs.toByteArray();
}
private int streamHTTPData(InputStream in, OutputStream out, boolean waitForDisconnect) {
StringBuffer foo = new StringBuffer("");
return streamHTTPData(in, out, foo, waitForDisconnect);
}
private int streamHTTPData(InputStream in, OutputStream out, StringBuffer host, boolean waitForDisconnect) {
// get the HTTP data from an InputStream, and send it to
// the designated OutputStream
StringBuffer header = new StringBuffer("");
String data = "";
int responseCode = 200;
int contentLength = 0;
int pos = -1;
int byteCount = 0;
try {
// get the first line of the header, so we know the response code
data = readLine(in);
if (data != null) {
header.append(data + "\r\n");
pos = data.indexOf(" ");
if ((data.toLowerCase().startsWith("http")) && (pos >= 0) && (data.indexOf(" ", pos + 1) >= 0)) {
String rcString = data.substring(pos + 1, data.indexOf(" ", pos + 1));
try {
responseCode = Integer.parseInt(rcString);
} catch (Exception e) {
if (debugLevel > 0)
debugOut.println("Error parsing response code " + rcString);
}
}
}
// get the rest of the header info
while ((data = readLine(in)) != null) {
// the header ends at the first blank line
if (data.length() == 0)
break;
header.append(data + "\r\n");
// check for the Host header
pos = data.toLowerCase().indexOf("host:");
if (pos >= 0) {
host.setLength(0);
host.append(data.substring(pos + 5).trim());
}
// check for the Content-Length header
pos = data.toLowerCase().indexOf("content-length:");
if (pos >= 0)
contentLength = Integer.parseInt(data.substring(pos + 15).trim());
}
// add a blank line to terminate the header info
header.append("\r\n");
// convert the header to a byte array, and write it to our stream
out.write(header.toString().getBytes(), 0, header.length());
// if the header indicated that this was not a 200 response,
// just return what we've got if there is no Content-Length,
// because we may not be getting anything else
if ((responseCode != 200) && (contentLength == 0)) {
out.flush();
return header.length();
}
// get the body, if any; we try to use the Content-Length header to
// determine how much data we're supposed to be getting, because
// sometimes the client/server won't disconnect after sending us
// information...
if (contentLength > 0)
waitForDisconnect = false;
if ((contentLength > 0) || (waitForDisconnect)) {
try {
byte[] buf = new byte[4096];
int bytesIn = 0;
while (((byteCount < contentLength) || (waitForDisconnect)) && ((bytesIn = in.read(buf)) >= 0)) {
out.write(buf, 0, bytesIn);
byteCount += bytesIn;
}
} catch (Exception e) {
String errMsg = "Error getting HTTP body: " + e;
if (debugLevel > 0)
debugOut.println(errMsg);
// bs.write(errMsg.getBytes(), 0, errMsg.length());
}
}
} catch (Exception e) {
if (debugLevel > 0)
debugOut.println("Error getting HTTP data: " + e);
}
// flush the OutputStream and return
try {
out.flush();
} catch (Exception e) {
}
return (header.length() + byteCount);
}
private String readLine(InputStream in) {
// reads a line of text from an InputStream
StringBuffer data = new StringBuffer("");
int c;
try {
// if we have nothing to read, just return null
in.mark(1);
if (in.read() == -1)
return null;
else
in.reset();
while ((c = in.read()) >= 0) {
// check for an end-of-line character
if ((c == 0) || (c == 10) || (c == 13))
break;
else
data.append((char) c);
}
// deal with the case where the end-of-line terminator is \r\n
if (c == 13) {
in.mark(1);
if (in.read() != 10)
in.reset();
}
} catch (Exception e) {
if (debugLevel > 0)
debugOut.println("Error getting header: " + e);
}
// and return what we have
return data.toString();
}
}
サーバーの起動方法:
public void run() {
new jProxy(1099).start();
}
TunnelSocket の設定方法:
TunnelSocket socket = new TunnelSocket("0.0.0.0", 1099, "xx.xxx.xxx.xxx", 80);
誰でも問題を見つけることができますか? サーバー側で何かをする必要がありますか? 別のプロキシ（Hidemyass）でTunnelSocket.javaを使用してみましたが、うまくいきました！
したがって、問題は私の jProxy に違いありません。
誰でも問題を見つけることができますか? 私の Web サーバーは 1099 にレジストリを作成します。
編集:プロキシをlocalhost(127.0.0.1)にバインドしました。
TunnelSocket socket = new TunnelSocket("127.0.0.1", 1099, "xx.xxx.xxx.xxx", 80);
Web サーバーの access.log を読んだところ、「CONNECT xx.xxx.xxx.xxx:80 HTTP/1.0" 405 557 "-" "Java/1.7.0"」というメッセージが表示されました。何の返事もくれません。
サーバー側でトラフィックを 1099 にリダイレクトする必要がありますか?
HTTP 405 は「メソッドが許可されていません」という意味で、なぜそれが得られるのかわかりません。