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+// \file props.cxx
+// Property server class.
+//
+// Written by Curtis Olson, started September 2000.
+// Modified by Bernie Bright, May 2002.
+//
+// Copyright (C) 2000  Curtis L. Olson - http://www.flightgear.org/~curt
+//
+// 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; either version 2 of the
+// License, or (at your option) any later version.
+//
+// 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 Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+// $Id$
+
+
+#include <simgear/io/sg_netChat.hxx>
+#include <simgear/structure/commands.hxx>
+#include <simgear/misc/strutils.hxx>
+#include <simgear/debug/logstream.hxx>
+
+#include <cstdio>
+#include <sstream>
+
+#include "UGear_command.hxx"
+#include "UGear_telnet.hxx"
+
+using std::stringstream;
+using std::ends;
+
+/**
+ * Props connection class.
+ * This class represents a connection to props client.
+ */
+class PropsChannel : public simgear::NetChat
+{
+    simgear::NetBuffer buffer;
+
+    /**
+     * Current property node name.
+     */
+    string path;
+
+    enum Mode {
+	PROMPT,
+	DATA
+    };
+    Mode mode;
+
+public:
+
+    /**
+     * Constructor.
+     */
+    PropsChannel();
+    
+    /**
+     * Append incoming data to our request buffer.
+     *
+     * @param s Character string to append to buffer
+     * @param n Number of characters to append.
+     */
+    void collectIncomingData( const char* s, int n );
+
+    /**
+     * Process a complete request from the props client.
+     */
+    void foundTerminator();
+
+private:
+    /**
+     * Return a "Node no found" error message to the client.
+     */
+    void node_not_found_error( const string& node_name );
+};
+
+/**
+ * 
+ */
+PropsChannel::PropsChannel()
+    : buffer(512),
+      path("/"),
+      mode(PROMPT)
+{
+    setTerminator( "\r\n" );
+}
+
+/**
+ * 
+ */
+void
+PropsChannel::collectIncomingData( const char* s, int n )
+{
+    buffer.append( s, n );
+}
+
+/**
+ * 
+ */
+void
+PropsChannel::node_not_found_error( const string& node_name )
+{
+    string error = "-ERR Node \"";
+    error += node_name;
+    error += "\" not found.";
+    push( error.c_str() );
+    push( getTerminator() );
+}
+
+/**
+ * We have a command.
+ * 
+ */
+void
+PropsChannel::foundTerminator()
+{
+    const char* cmd = buffer.getData();
+    SG_LOG( SG_IO, SG_INFO, "processing command = \"" << cmd << "\"" );
+
+    std::vector<std::string> tokens = simgear::strutils::split( cmd );
+
+    if (!tokens.empty()) {
+	string command = tokens[0];
+
+        if ( command == "send" ) {
+            command_mgr.add( tokens[1] );
+        } else if ( command == "quit" ) {
+	    close();
+	    shouldDelete();
+	    return;
+	} else if ( command == "data" ) {
+	    mode = DATA;
+	} else if ( command == "prompt" ) {
+	    mode = PROMPT;
+	} else {
+	    const char* msg = "\
+Valid commands are:\r\n\
+\r\n\
+data               switch to raw data mode\r\n\
+prompt             switch to interactive mode (default)\r\n\
+quit               terminate connection\r\n\
+send <command>     send <command> to UAS\r\n";
+	    push( msg );
+	}
+    }
+
+    if (mode == PROMPT) {
+	string prompt = "> ";
+	push( prompt.c_str() );
+    }
+
+    buffer.remove();
+}
+
+/**
+ * 
+ */
+UGTelnet::UGTelnet( const int port_num ):
+    enabled(false)
+{
+    port = port_num;
+}
+
+/**
+ * 
+ */
+UGTelnet::~UGTelnet()
+{
+}
+
+/**
+ * 
+ */
+bool
+UGTelnet::open()
+{
+    if (enabled ) {
+	printf("This shouldn't happen, but the telnet channel is already in use, ignoring\n" );
+	return false;
+    }
+
+    simgear::NetChannel::open();
+    simgear::NetChannel::bind( "", port );
+    simgear::NetChannel::listen( 5 );
+    printf("Telnet server started on port %d\n", port );
+
+    enabled = true;
+    poller.addChannel(this);
+    
+    return true;
+}
+
+/**
+ * 
+ */
+bool
+UGTelnet::close()
+{
+    SG_LOG( SG_IO, SG_INFO, "closing UGTelnet" );   
+    return true;
+}
+
+/**
+ * 
+ */
+bool
+UGTelnet::process()
+{
+    poller.poll();
+    return true;
+}
+
+/**
+ * 
+ */
+void
+UGTelnet::handleAccept()
+{
+    simgear::IPAddress addr;
+    int handle = simgear::NetChannel::accept( &addr );
+    printf("Telent server accepted connection from %s:%d\n",
+           addr.getHost(), addr.getPort() );
+    PropsChannel* channel = new PropsChannel();
+    channel->setHandle( handle );
+    poller.addChannel(channel);
+}