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path: root/OpenSim/Framework/Console/RemoteConsole.cs
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/*
 * Copyright (c) Contributors, http://opensimulator.org/
 * See CONTRIBUTORS.TXT for a full list of copyright holders.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the OpenSimulator Project nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

using System;
using System.Xml;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Timers;
using OpenMetaverse;
using Nini.Config;
using OpenSim.Framework.Servers.HttpServer;
using log4net;

namespace OpenSim.Framework.Console
{
    // A console that uses REST interfaces
    //
    public class RemoteConsole : CommandConsole
    {
		// Connection specific data, indexed by a session ID
		// we create when a client connects.
		protected class ConsoleConnection
		{
			// Last activity from the client
			public int last;

			// Last line of scrollback posted to this client
			public long lastLineSeen;

			// True if this is a new connection, e.g. has never
			// displayed a prompt to the user.
			public bool newConnection = true;
		}

		// A line in the scrollback buffer. 
		protected class ScrollbackEntry
		{
			// The line number of this entry
			public long lineNumber;

			// The text to send to the client
			public string text;

			// The level this should be logged as. Omitted for
			// prompts and input echo.
			public string level;

			// True if the text above is a prompt, e.g. the
			// client should turn on the cursor / accept input
			public bool isPrompt;

			// True if the requested input is a command. A
			// client may offer help or validate input if
			// this is set. If false, input should be sent
			// as typed.
			public bool isCommand;

			// True if this text represents a line of text that
			// was input in response to a prompt. A client should
			// turn off the cursor and refrain from sending commands
			// until a new prompt is received.
			public bool isInput;
		}

		// Data that is relevant to all connections

		// The scrollback buffer
        protected List<ScrollbackEntry> m_Scrollback = new List<ScrollbackEntry>();

		// Monotonously incrementing line number. This may eventually
		// wrap. No provision is made for that case because 64 bits
		// is a long, long time.
        protected long m_lineNumber = 0;

		// These two variables allow us to send the correct
		// information about the prompt status to the client,
		// irrespective of what may have run off the top of the
		// scrollback buffer;
		protected bool m_expectingInput = false;
		protected bool m_expectingCommand = true;
		protected string m_lastPromptUsed;
		
		// This is the list of things received from clients.
		// Note: Race conditions can happen. If a client sends
		// something while nothing is expected, it will be
		// intepreted as input to the next prompt. For
		// commands this is largely correct. For other prompts,
		// YMMV.
		// TODO: Find a better way to fix this
        protected List<string> m_InputData = new List<string>();

		// Event to allow ReadLine to wait synchronously even though
		// everthing else is asynchronous here.
        protected ManualResetEvent m_DataEvent = new ManualResetEvent(false);

		// The list of sessions we maintain. Unlike other console types,
		// multiple users on the same console are explicitly allowed.
        protected Dictionary<UUID, ConsoleConnection> m_Connections =
                new Dictionary<UUID, ConsoleConnection>();

		// Timer to control expiration of sessions that have been
		// disconnected.
		protected System.Timers.Timer m_expireTimer = new System.Timers.Timer(5000);

		// The less interesting stuff that makes the actual server
		// work.
        protected IHttpServer m_Server = null;
        protected IConfigSource m_Config = null;

        protected string m_UserName = String.Empty;
        protected string m_Password = String.Empty;
        protected string m_AllowedOrigin = String.Empty;


        public RemoteConsole(string defaultPrompt) : base(defaultPrompt)
        {
			// There is something wrong with this architecture.
			// A prompt is sent on every single input, so why have this?
			// TODO: Investigate and fix.
			m_lastPromptUsed = defaultPrompt;

			// Start expiration of sesssions.
			m_expireTimer.Elapsed += DoExpire;
			m_expireTimer.Start();
        }

        public void ReadConfig(IConfigSource config)
        {
            m_Config = config;

			// We're pulling this from the 'Network' section for legacy
			// compatibility. However, this is so essentially insecure
			// that TLS and client certs should be used instead of
			// a username / password.
            IConfig netConfig = m_Config.Configs["Network"];

            if (netConfig == null)
                return;

			// Get the username and password.
            m_UserName = netConfig.GetString("ConsoleUser", String.Empty);
            m_Password = netConfig.GetString("ConsolePass", String.Empty);

			// Woefully underdocumented, this is what makes javascript
			// console clients work. Set to "*" for anywhere or (better)
			// to specific addresses.
            m_AllowedOrigin = netConfig.GetString("ConsoleAllowedOrigin", String.Empty);
        }

        public void SetServer(IHttpServer server)
        {
			// This is called by the framework to give us the server
			// instance (means: port) to work with.
            m_Server = server;

			// Add our handlers
            m_Server.AddHTTPHandler("/StartSession/", HandleHttpStartSession);
            m_Server.AddHTTPHandler("/CloseSession/", HandleHttpCloseSession);
            m_Server.AddHTTPHandler("/SessionCommand/", HandleHttpSessionCommand);
        }

        public override void Output(string text, string level)
		{
			Output(text, level, false, false, false);
		}

        protected void Output(string text, string level, bool isPrompt, bool isCommand, bool isInput)
        {
			// Increment the line number. It was 0 and they start at 1
			// so we need to pre-increment.
			m_lineNumber++;

			// Create and populate the new entry.
			ScrollbackEntry newEntry = new ScrollbackEntry();

			newEntry.lineNumber = m_lineNumber;
			newEntry.text = text;
			newEntry.level = level;
			newEntry.isPrompt = isPrompt;
			newEntry.isCommand = isCommand;
			newEntry.isInput = isInput;

			// Add a line to the scrollback. In some cases, that may not
			// actually be a line of text.
            lock (m_Scrollback)
            {
				// Prune the scrollback to the length se send as connect
				// burst to give the user some context.
                while (m_Scrollback.Count >= 1000)
                    m_Scrollback.RemoveAt(0);

                m_Scrollback.Add(newEntry);
            }

			// Let the rest of the system know we have output something.
            FireOnOutput(text.Trim());

			// Also display it for debugging.
            System.Console.WriteLine(text.Trim());
        }

        public override void Output(string text)
        {
			// Output plain (non-logging style) text.
            Output(text, String.Empty, false, false, false);
        }

        public override string ReadLine(string p, bool isCommand, bool e)
        {
			// Output the prompt an prepare to wait. This
			// is called on a dedicated console thread and
			// needs to be synchronous. Old architecture but
			// not worth upgrading.
			if (isCommand)
			{
				m_expectingInput = true;
				m_expectingCommand = true;
                Output(p, String.Empty, true, true, false);
				m_lastPromptUsed = p;
			}
			else
			{
				m_expectingInput = true;
                Output(p, String.Empty, true, false, false);
			}


			// Here is where we wait for the user to input something.
            m_DataEvent.WaitOne();

            string cmdinput;

			// Check for empty input. Read input if not empty.
            lock (m_InputData)
            {
                if (m_InputData.Count == 0)
                {
                    m_DataEvent.Reset();
					m_expectingInput = false;
					m_expectingCommand = false;

                    return "";
                }

                cmdinput = m_InputData[0];
                m_InputData.RemoveAt(0);
                if (m_InputData.Count == 0)
                    m_DataEvent.Reset();

            }

			m_expectingInput = false;
			m_expectingCommand = false;

			// Echo to all the other users what we have done. This
			// will also go to ourselves.
			Output (cmdinput, String.Empty, false, false, true);

			// If this is a command, we need to resolve and execute it.
            if (isCommand)
            {
				// This call will actually execute the command and create
				// any output associated with it. The core just gets an
				// empty string so it will call again immediately.
                string[] cmd = Commands.Resolve(Parser.Parse(cmdinput));

                if (cmd.Length != 0)
                {
                    int i;

                    for (i=0 ; i < cmd.Length ; i++)
                    {
                        if (cmd[i].Contains(" "))
                            cmd[i] = "\"" + cmd[i] + "\"";
                    }
                    return String.Empty;
                }
            }

			// Return the raw input string if not a command.
            return cmdinput;
        }

		// Very simplistic static access control header.
        protected Hashtable CheckOrigin(Hashtable result)
        {
            if (!string.IsNullOrEmpty(m_AllowedOrigin))
                result["access_control_allow_origin"] = m_AllowedOrigin;

            return result;
        }

        /* TODO: Figure out how PollServiceHTTPHandler can access the request headers
         * in order to use m_AllowedOrigin as a regular expression
        protected Hashtable CheckOrigin(Hashtable headers, Hashtable result)
        {
            if (!string.IsNullOrEmpty(m_AllowedOrigin))
            {
                if (headers.ContainsKey("origin"))
                {
                    string origin = headers["origin"].ToString();
                    if (Regex.IsMatch(origin, m_AllowedOrigin))
                        result["access_control_allow_origin"] = origin;
                }
            }
            return result;
        }
        */

        protected void DoExpire(Object sender, ElapsedEventArgs e)
        {
			// Iterate the list of console connections and find those we
			// haven't heard from for longer then the longpoll interval.
			// Remove them.
            List<UUID> expired = new List<UUID>();

            lock (m_Connections)
            {
				// Mark the expired ones
                foreach (KeyValuePair<UUID, ConsoleConnection> kvp in m_Connections)
                {
                    if (System.Environment.TickCount - kvp.Value.last > 500000)
                        expired.Add(kvp.Key);
                }

				// Delete them
                foreach (UUID id in expired)
                {
                    m_Connections.Remove(id);
                    CloseConnection(id);
                }
            }
        }

		// Start a new session.
        protected Hashtable HandleHttpStartSession(Hashtable request)
        {
			// The login is in the form of a http form post
            Hashtable post = DecodePostString(request["body"].ToString());
            Hashtable reply = new Hashtable();

            reply["str_response_string"] = "";
            reply["int_response_code"] = 401;
            reply["content_type"] = "text/plain";

			// Check user name and password
            if (m_UserName == String.Empty)
                return reply;

            if (post["USER"] == null || post["PASS"] == null)
                return reply;

            if (m_UserName != post["USER"].ToString() ||
                m_Password != post["PASS"].ToString())
            {
                return reply;
            }

			// Set up the new console connection record
            ConsoleConnection c = new ConsoleConnection();
            c.last = System.Environment.TickCount;
            c.lastLineSeen = 0;

			// Assign session ID
            UUID sessionID = UUID.Random();

			// Add connection to list.
            lock (m_Connections)
            {
                m_Connections[sessionID] = c;
            }

			// This call is a CAP. The URL is the authentication.
            string uri = "/ReadResponses/" + sessionID.ToString() + "/";

            m_Server.AddPollServiceHTTPHandler(
                uri, new PollServiceEventArgs(null, uri, HasEvents, GetEvents, NoEvents, sessionID,25000)); // 25 secs timeout

			// Our reply is an XML document.
			// TODO: Change this to Linq.Xml
            XmlDocument xmldoc = new XmlDocument();
            XmlNode xmlnode = xmldoc.CreateNode(XmlNodeType.XmlDeclaration,
                    "", "");

            xmldoc.AppendChild(xmlnode);
            XmlElement rootElement = xmldoc.CreateElement("", "ConsoleSession",
                    "");

            xmldoc.AppendChild(rootElement);

            XmlElement id = xmldoc.CreateElement("", "SessionID", "");
            id.AppendChild(xmldoc.CreateTextNode(sessionID.ToString()));

            rootElement.AppendChild(id);

            XmlElement prompt = xmldoc.CreateElement("", "Prompt", "");
            prompt.AppendChild(xmldoc.CreateTextNode(m_lastPromptUsed));

            rootElement.AppendChild(prompt);

            rootElement.AppendChild(MainConsole.Instance.Commands.GetXml(xmldoc));

			// Set up the response and check origin
            reply["str_response_string"] = xmldoc.InnerXml;
            reply["int_response_code"] = 200;
            reply["content_type"] = "text/xml";
            reply = CheckOrigin(reply);

            return reply;
        }

		// Client closes session. Clean up.
        protected Hashtable HandleHttpCloseSession(Hashtable request)
        {
            Hashtable post = DecodePostString(request["body"].ToString());
            Hashtable reply = new Hashtable();

            reply["str_response_string"] = "";
            reply["int_response_code"] = 404;
            reply["content_type"] = "text/plain";

            if (post["ID"] == null)
                return reply;

            UUID id;
            if (!UUID.TryParse(post["ID"].ToString(), out id))
                return reply;

            lock (m_Connections)
            {
                if (m_Connections.ContainsKey(id))
                {
                    m_Connections.Remove(id);
                    CloseConnection(id);
                }
            }

            XmlDocument xmldoc = new XmlDocument();
            XmlNode xmlnode = xmldoc.CreateNode(XmlNodeType.XmlDeclaration,
                    "", "");

            xmldoc.AppendChild(xmlnode);
            XmlElement rootElement = xmldoc.CreateElement("", "ConsoleSession",
                    "");

            xmldoc.AppendChild(rootElement);

            XmlElement res = xmldoc.CreateElement("", "Result", "");
            res.AppendChild(xmldoc.CreateTextNode("OK"));

            rootElement.AppendChild(res);

            reply["str_response_string"] = xmldoc.InnerXml;
            reply["int_response_code"] = 200;
            reply["content_type"] = "text/xml";
            reply = CheckOrigin(reply);

            return reply;
        }

		// Command received from the client.
        protected Hashtable HandleHttpSessionCommand(Hashtable request)
        {
            Hashtable post = DecodePostString(request["body"].ToString());
            Hashtable reply = new Hashtable();

            reply["str_response_string"] = "";
            reply["int_response_code"] = 404;
            reply["content_type"] = "text/plain";

			// Check the ID
            if (post["ID"] == null)
                return reply;

            UUID id;
            if (!UUID.TryParse(post["ID"].ToString(), out id))
                return reply;

			// Find the connection for that ID.
            lock (m_Connections)
            {
                if (!m_Connections.ContainsKey(id))
                    return reply;
            }

			// Empty post. Just error out.
            if (post["COMMAND"] == null)
                return reply;

			// Place the input data in the buffer.
            lock (m_InputData)
            {
                m_DataEvent.Set();
                m_InputData.Add(post["COMMAND"].ToString());
            }

			// Create the XML reply document.
            XmlDocument xmldoc = new XmlDocument();
            XmlNode xmlnode = xmldoc.CreateNode(XmlNodeType.XmlDeclaration,
                    "", "");

            xmldoc.AppendChild(xmlnode);
            XmlElement rootElement = xmldoc.CreateElement("", "ConsoleSession",
                    "");

            xmldoc.AppendChild(rootElement);

            XmlElement res = xmldoc.CreateElement("", "Result", "");
            res.AppendChild(xmldoc.CreateTextNode("OK"));

            rootElement.AppendChild(res);

            reply["str_response_string"] = xmldoc.InnerXml;
            reply["int_response_code"] = 200;
            reply["content_type"] = "text/xml";
            reply = CheckOrigin(reply);

            return reply;
        }

		// Decode a HTTP form post to a Hashtable
        protected Hashtable DecodePostString(string data)
        {
            Hashtable result = new Hashtable();

            string[] terms = data.Split(new char[] {'&'});

            foreach (string term in terms)
            {
                string[] elems = term.Split(new char[] {'='});
                if (elems.Length == 0)
                    continue;

                string name = System.Web.HttpUtility.UrlDecode(elems[0]);
                string value = String.Empty;

                if (elems.Length > 1)
                    value = System.Web.HttpUtility.UrlDecode(elems[1]);
                
                result[name] = value;
            }

            return result;
        }

		// Close the CAP receiver for the responses for a given client.
        public void CloseConnection(UUID id)
        {
            try
            {
                string uri = "/ReadResponses/" + id.ToString() + "/";

                m_Server.RemovePollServiceHTTPHandler("", uri);
            }
            catch (Exception)
            {
            }
        }

		// Check if there is anything to send. Return true if this client has
		// lines pending.
        protected bool HasEvents(UUID RequestID, UUID sessionID)
        {
            ConsoleConnection c = null;

            lock (m_Connections)
            {
                if (!m_Connections.ContainsKey(sessionID))
                    return false;
                c = m_Connections[sessionID];
            }
            c.last = System.Environment.TickCount;
            if (c.lastLineSeen < m_lineNumber)
                return true;
            return false;
        }

		// Send all pending output to the client.
        protected Hashtable GetEvents(UUID RequestID, UUID sessionID)
        {
			// Find the connection that goes with this client.
            ConsoleConnection c = null;

            lock (m_Connections)
            {
                if (!m_Connections.ContainsKey(sessionID))
                    return NoEvents(RequestID, UUID.Zero);
                c = m_Connections[sessionID];
            }

			// If we have nothing to send, send the no events response.
            c.last = System.Environment.TickCount;
            if (c.lastLineSeen >= m_lineNumber)
                return NoEvents(RequestID, UUID.Zero);

            Hashtable result = new Hashtable();

			// Create the response document.
            XmlDocument xmldoc = new XmlDocument();
            XmlNode xmlnode = xmldoc.CreateNode(XmlNodeType.XmlDeclaration,
                    "", "");

            xmldoc.AppendChild(xmlnode);
            XmlElement rootElement = xmldoc.CreateElement("", "ConsoleSession",
                    "");

            //if (c.newConnection)
            //{
            //    c.newConnection = false;
            //    Output("+++" + DefaultPrompt);
            //}

            lock (m_Scrollback)
            {
                long startLine = m_lineNumber - m_Scrollback.Count;
                long sendStart = startLine;
                if (sendStart < c.lastLineSeen)
                    sendStart = c.lastLineSeen;

                for (long i = sendStart ; i < m_lineNumber ; i++)
                {
					ScrollbackEntry e = m_Scrollback[(int)(i - startLine)];

                    XmlElement res = xmldoc.CreateElement("", "Line", "");
                    res.SetAttribute("Number", e.lineNumber.ToString());
                    res.SetAttribute("Level", e.level);
					// Don't include these for the scrollback, we'll send the
					// real state later.
					if (!c.newConnection)
					{
						res.SetAttribute("Prompt", e.isPrompt ? "true" : "false");
						res.SetAttribute("Command", e.isCommand ? "true" : "false");
						res.SetAttribute("Input", e.isInput ? "true" : "false");
					}
					else if (i == m_lineNumber - 1) // Last line for a new connection
					{
						res.SetAttribute("Prompt", m_expectingInput ? "true" : "false");
						res.SetAttribute("Command", m_expectingCommand ? "true" : "false");
						res.SetAttribute("Input", (!m_expectingInput) ? "true" : "false");
					}
					else
					{
						res.SetAttribute("Input", e.isInput ? "true" : "false");
					}

                    res.AppendChild(xmldoc.CreateTextNode(e.text));

                    rootElement.AppendChild(res);
                }
            }

            c.lastLineSeen = m_lineNumber;
			c.newConnection = false;

            xmldoc.AppendChild(rootElement);

            result["str_response_string"] = xmldoc.InnerXml;
            result["int_response_code"] = 200;
            result["content_type"] = "application/xml";
            result["keepalive"] = false;
            result["reusecontext"] = false;
            result = CheckOrigin(result);

            return result;
        }

		// This is really just a no-op. It generates what is sent
		// to the client if the poll times out without any events.
        protected Hashtable NoEvents(UUID RequestID, UUID id)
        {
            Hashtable result = new Hashtable();

            XmlDocument xmldoc = new XmlDocument();
            XmlNode xmlnode = xmldoc.CreateNode(XmlNodeType.XmlDeclaration,
                    "", "");

            xmldoc.AppendChild(xmlnode);
            XmlElement rootElement = xmldoc.CreateElement("", "ConsoleSession",
                    "");

            xmldoc.AppendChild(rootElement);

            result["str_response_string"] = xmldoc.InnerXml;
            result["int_response_code"] = 200;
            result["content_type"] = "text/xml";
            result["keepalive"] = false;
            result["reusecontext"] = false;
            result = CheckOrigin(result);

            return result;
        }
    }
}