/**
* Accepts a connection from a specific host.
*
* @param s the accepted connection.
* @param saddr the socket address of the host we do accept connection from
* @exception IOException if an I/O error occurs when accepting the connection.
*/
protected void acceptFrom(SocketImpl s, InetSocketAddress saddr) throws IOException {
if (cmdsock == null) {
// Not a Socks ServerSocket.
return;
}
InputStream in = cmdIn;
// Sends the "SOCKS BIND" request.
socksBind(saddr);
in.read();
int i = in.read();
in.read();
SocketException ex = null;
int nport;
byte[] addr;
InetSocketAddress real_end = null;
switch (i) {
case REQUEST_OK:
// success!
i = in.read();
switch (i) {
case IPV4:
addr = new byte[4];
readSocksReply(in, addr);
nport = in.read() << 8;
nport += in.read();
real_end = new InetSocketAddress(new Inet4Address("", addr), nport);
break;
case DOMAIN_NAME:
int len = in.read();
addr = new byte[len];
readSocksReply(in, addr);
nport = in.read() << 8;
nport += in.read();
real_end = new InetSocketAddress(new String(addr), nport);
break;
case IPV6:
addr = new byte[16];
readSocksReply(in, addr);
nport = in.read() << 8;
nport += in.read();
real_end = new InetSocketAddress(new Inet6Address("", addr), nport);
break;
}
break;
case GENERAL_FAILURE:
ex = new SocketException("SOCKS server general failure");
break;
case NOT_ALLOWED:
ex = new SocketException("SOCKS: Accept not allowed by ruleset");
break;
case NET_UNREACHABLE:
ex = new SocketException("SOCKS: Network unreachable");
break;
case HOST_UNREACHABLE:
ex = new SocketException("SOCKS: Host unreachable");
break;
case CONN_REFUSED:
ex = new SocketException("SOCKS: Connection refused");
break;
case TTL_EXPIRED:
ex = new SocketException("SOCKS: TTL expired");
break;
case CMD_NOT_SUPPORTED:
ex = new SocketException("SOCKS: Command not supported");
break;
case ADDR_TYPE_NOT_SUP:
ex = new SocketException("SOCKS: address type not supported");
break;
}
if (ex != null) {
cmdIn.close();
cmdOut.close();
cmdsock.close();
cmdsock = null;
throw ex;
}
/**
* This is where we have to do some fancy stuff. The datastream from the socket "accepted" by
* the proxy will come through the cmdSocket. So we have to swap the socketImpls
*/
if (s instanceof SocksSocketImpl) {
((SocksSocketImpl) s).external_address = real_end;
}
if (s instanceof PlainSocketImpl) {
((PlainSocketImpl) s).setInputStream((SocketInputStream) in);
}
s.fd = cmdsock.getImpl().fd;
s.address = cmdsock.getImpl().address;
s.port = cmdsock.getImpl().port;
s.localport = cmdsock.getImpl().localport;
// Need to do that so that the socket won't be closed
// when the ServerSocket is closed by the user.
// It kinds of detaches the Socket because it is now
// used elsewhere.
cmdsock = null;
}
