view src/net/sourceforge/jsocks/Socks4Message.java @ 245:23119f3c0d28
add host preference for fixed screen size
author |
Carl Byington <carl@five-ten-sg.com> |
date |
Mon, 14 Jul 2014 11:15:42 -0700 (2014-07-14) |
parents |
0ce5cc452d02 |
children |
205ee2873330 |
line source
package net.sourceforge.jsocks;
import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.UnknownHostException;
/**
SOCKS4 Reply/Request message.
*/
public class Socks4Message extends ProxyMessage {
private byte[] msgBytes;
private int msgLength;
/**
* Server failed reply, cmd command for failed request
*/
public Socks4Message(int cmd) {
super(cmd, null, 0);
this.user = null;
msgLength = 2;
msgBytes = new byte[2];
msgBytes[0] = (byte) 0;
msgBytes[1] = (byte) command;
}
/**
* Server successfull reply
*/
public Socks4Message(int cmd, InetAddress ip, int port) {
this(0, cmd, ip, port, null);
}
/**
* Client request
*/
public Socks4Message(int cmd, InetAddress ip, int port, String user) {
this(SOCKS_VERSION, cmd, ip, port, user);
}
/**
* Most general constructor
*/
public Socks4Message(int version, int cmd,
InetAddress ip, int port, String user) {
super(cmd, ip, port);
this.user = user;
this.version = version;
msgLength = user == null ? 8 : 9 + user.length();
msgBytes = new byte[msgLength];
msgBytes[0] = (byte) version;
msgBytes[1] = (byte) command;
msgBytes[2] = (byte)(port >> 8);
msgBytes[3] = (byte) port;
byte[] addr;
if (ip != null)
addr = ip.getAddress();
else {
addr = new byte[4];
addr[0] = addr[1] = addr[2] = addr[3] = 0;
}
System.arraycopy(addr, 0, msgBytes, 4, 4);
if (user != null) {
byte[] buf = user.getBytes();
System.arraycopy(buf, 0, msgBytes, 8, buf.length);
msgBytes[msgBytes.length - 1 ] = 0;
}
}
/**
*Initialise from the stream
*If clientMode is true attempts to read a server response
*otherwise reads a client request
*see read for more detail
*/
public Socks4Message(InputStream in, boolean clientMode) throws IOException {
msgBytes = null;
read(in, clientMode);
}
@Override
public void read(InputStream in) throws IOException {
read(in, true);
}
@Override
public void read(InputStream in, boolean clientMode) throws IOException {
boolean mode4a = false;
DataInputStream d_in = new DataInputStream(in);
version = d_in.readUnsignedByte();
command = d_in.readUnsignedByte();
if (clientMode && command != REPLY_OK) {
String errMsg;
if (command > REPLY_OK && command < REPLY_BAD_IDENTD)
errMsg = replyMessage[command - REPLY_OK];
else
errMsg = "Unknown Reply Code";
throw new SocksException(command, errMsg);
}
port = d_in.readUnsignedShort();
byte[] addr = new byte[4];
d_in.readFully(addr);
if (addr[0] == 0 && addr[1] == 0 && addr[2] == 0 && addr[3] != 0)
mode4a = true;
else {
ip = bytes2IP(addr);
host = ip.getHostName();
}
if (!clientMode) {
StringBuilder sb = new StringBuilder();
int b;
while ((b = in.read()) != 0)
sb.append((char) b);
user = sb.toString();
if (mode4a) {
sb.setLength(0);
while ((b = in.read()) != 0)
sb.append((char) b);
host = sb.toString();
}
}
}
@Override
public void write(OutputStream out) throws IOException {
if (msgBytes == null) {
Socks4Message msg = new Socks4Message(version, command, ip, port, user);
msgBytes = msg.msgBytes;
msgLength = msg.msgLength;
}
out.write(msgBytes);
}
//Class methods
static InetAddress bytes2IP(byte[] addr) {
String s = bytes2IPV4(addr, 0);
try {
return InetAddress.getByName(s);
}
catch (UnknownHostException uh_ex) {
return null;
}
}
//Constants
static final String[] replyMessage = {
"Request Granted",
"Request Rejected or Failed",
"Failed request, can't connect to Identd",
"Failed request, bad user name"
};
static final int SOCKS_VERSION = 4;
public final static int REQUEST_CONNECT = 1;
public final static int REQUEST_BIND = 2;
public final static int REPLY_OK = 90;
public final static int REPLY_REJECTED = 91;
public final static int REPLY_NO_CONNECT = 92;
public final static int REPLY_BAD_IDENTD = 93;
}