RemotingConfiguration.cs :  » 2.6.4-mono-.net-core » System.Runtime » System » Runtime » Remoting » C# / CSharp Open Source

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C# / CSharp Open Source » 2.6.4 mono .net core » System.Runtime 
System.Runtime » System » Runtime » Remoting » RemotingConfiguration.cs
//
// System.Runtime.Remoting.RemotingConfiguration.cs
//
// Author: Jaime Anguiano Olarra (jaime@gnome.org)
//         Lluis Sanchez Gual (lluis@ideary.com)
//
// (C) 2002, Jaime Anguiano Olarra
//

//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Globalization;
using System.IO;
using System.Reflection;
using System.Collections;
using System.Runtime.Remoting.Activation;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Lifetime;
using Mono.Xml;

namespace System.Runtime.Remoting{  
  [System.Runtime.InteropServices.ComVisible (true)]
  public static class RemotingConfiguration
  {
    
    static string applicationID = null;
    static string applicationName = null;
//    static string configFile = "";
//    static SmallXmlParser parser = null; 
    static string processGuid = null;
    static bool defaultConfigRead = false;
    static bool defaultDelayedConfigRead = false;
    static string _errorMode;

    static Hashtable wellKnownClientEntries = new Hashtable();
    static Hashtable activatedClientEntries = new Hashtable();
    static Hashtable wellKnownServiceEntries = new Hashtable();
    static Hashtable activatedServiceEntries = new Hashtable();
    
    static Hashtable channelTemplates = new Hashtable ();
    static Hashtable clientProviderTemplates = new Hashtable ();
    static Hashtable serverProviderTemplates = new Hashtable ();
    
    // public properties
    // At this time the ID will be the application name 
    public static string ApplicationId 
    {
      get 
      {
        applicationID = ApplicationName; 
        return applicationID;
      }
    }
    
    public static string ApplicationName 
    {
      get { return applicationName; }
      set { applicationName = value; }
    }

    [MonoTODO]
    public static CustomErrorsModes CustomErrorsMode
    {
      get { throw new NotImplementedException (); }
      set { throw new NotImplementedException (); }
    }

    public static string ProcessId 
    {
      get {
        if (processGuid == null)
          processGuid = AppDomain.GetProcessGuid ();

        return processGuid;
      }
    }


    // public methods
    
    [MonoTODO ("ensureSecurity support has not been implemented")]
    public static void Configure (string filename, bool ensureSecurity) 
    {
      lock (channelTemplates) {
        if (!defaultConfigRead) {
          ReadConfigFile (Environment.GetMachineConfigPath ());
          defaultConfigRead = true;
        }

        if (filename != null)
          ReadConfigFile (filename);
      }
    }

    [Obsolete ("Use Configure(String,Boolean)")]
    public static void Configure (string filename) 
    {
      Configure (filename, false);
    }

    private static void ReadConfigFile (string filename)
    {
      try
      {
        SmallXmlParser parser = new SmallXmlParser ();
        using (TextReader rreader = new StreamReader (filename)) {
          ConfigHandler handler = new ConfigHandler (false);
          parser.Parse (rreader, handler);
        }
      }
      catch (Exception ex)
      {
        throw new RemotingException ("Configuration file '" + filename + "' could not be loaded: " + ex.Message, ex);
      }
    }
    
    internal static void LoadDefaultDelayedChannels ()
    {
      lock (channelTemplates)
      {
        if (defaultDelayedConfigRead || defaultConfigRead) return;
        
        SmallXmlParser parser = new SmallXmlParser ();
        using (TextReader rreader = new StreamReader (Environment.GetMachineConfigPath ())) {
          ConfigHandler handler = new ConfigHandler (true);
          parser.Parse (rreader, handler);
        }
        defaultDelayedConfigRead = true;
      }
    }
  
    public static ActivatedClientTypeEntry[] GetRegisteredActivatedClientTypes () 
    {
      lock (channelTemplates)
      {
        ActivatedClientTypeEntry[] entries = new ActivatedClientTypeEntry[activatedClientEntries.Count];
        activatedClientEntries.Values.CopyTo (entries,0);
        return entries;
      }
    }

    public static ActivatedServiceTypeEntry[] GetRegisteredActivatedServiceTypes () 
    {
      lock (channelTemplates)
      {
        ActivatedServiceTypeEntry[] entries = new ActivatedServiceTypeEntry[activatedServiceEntries.Count];
        activatedServiceEntries.Values.CopyTo (entries,0);
        return entries;
      }
    }

    public static WellKnownClientTypeEntry[] GetRegisteredWellKnownClientTypes () 
    {
      lock (channelTemplates)
      {
        WellKnownClientTypeEntry[] entries = new WellKnownClientTypeEntry[wellKnownClientEntries.Count];
        wellKnownClientEntries.Values.CopyTo (entries,0);
        return entries;
      }
    }

    public static WellKnownServiceTypeEntry[] GetRegisteredWellKnownServiceTypes () 
    {
      lock (channelTemplates)
      {
        WellKnownServiceTypeEntry[] entries = new WellKnownServiceTypeEntry[wellKnownServiceEntries.Count];
        wellKnownServiceEntries.Values.CopyTo (entries,0);
        return entries;
      }
    }

    public static bool IsActivationAllowed (Type svrType) 
    {
      lock (channelTemplates)
      {
        return activatedServiceEntries.ContainsKey (svrType);
      }
    }

    public static ActivatedClientTypeEntry IsRemotelyActivatedClientType (Type svrType) 
    {
      lock (channelTemplates)
      {
        return activatedClientEntries [svrType] as ActivatedClientTypeEntry;
      }
    }

    public static ActivatedClientTypeEntry IsRemotelyActivatedClientType (string typeName, string assemblyName) 
    {
      return IsRemotelyActivatedClientType (Assembly.Load(assemblyName).GetType (typeName));
    }

    public static WellKnownClientTypeEntry IsWellKnownClientType (Type svrType) 
    {
      lock (channelTemplates)
      {
        return wellKnownClientEntries [svrType] as WellKnownClientTypeEntry;
      }
    }

    public static WellKnownClientTypeEntry IsWellKnownClientType (string typeName, string assemblyName) 
    {
      return IsWellKnownClientType (Assembly.Load(assemblyName).GetType (typeName));
    }

    public static void RegisterActivatedClientType (ActivatedClientTypeEntry entry) 
    {
      lock (channelTemplates)
      {
        if (wellKnownClientEntries.ContainsKey (entry.ObjectType) || activatedClientEntries.ContainsKey (entry.ObjectType))
          throw new RemotingException ("Attempt to redirect activation of type '" + entry.ObjectType.FullName + "' which is already redirected.");
  
        activatedClientEntries[entry.ObjectType] = entry;
        ActivationServices.EnableProxyActivation (entry.ObjectType, true);
      }
    }

    public static void RegisterActivatedClientType (Type type, string appUrl) 
    {
      if (type == null) throw new ArgumentNullException ("type");
      if (appUrl == null) throw new ArgumentNullException ("appUrl");

      RegisterActivatedClientType (new ActivatedClientTypeEntry (type, appUrl));
    }

    public static void RegisterActivatedServiceType (ActivatedServiceTypeEntry entry) 
    {
      lock (channelTemplates)
      {
        activatedServiceEntries.Add (entry.ObjectType, entry);
      }
    }

    public static void RegisterActivatedServiceType (Type type) 
    {
      RegisterActivatedServiceType (new ActivatedServiceTypeEntry (type));
    }

    public static void RegisterWellKnownClientType (Type type, string objectUrl) 
    {
      if (type == null) throw new ArgumentNullException ("type");
      if (objectUrl == null) throw new ArgumentNullException ("objectUrl");

      RegisterWellKnownClientType (new WellKnownClientTypeEntry (type, objectUrl));
    }

    public static void RegisterWellKnownClientType (WellKnownClientTypeEntry entry) 
    {
      lock (channelTemplates)
      {
        if (wellKnownClientEntries.ContainsKey (entry.ObjectType) || activatedClientEntries.ContainsKey (entry.ObjectType))
          throw new RemotingException ("Attempt to redirect activation of type '" + entry.ObjectType.FullName + "' which is already redirected.");
  
        wellKnownClientEntries[entry.ObjectType] = entry;
        ActivationServices.EnableProxyActivation (entry.ObjectType, true);
      }
    }

    public static void RegisterWellKnownServiceType (Type type, string objectUri, WellKnownObjectMode mode) 
    {
      RegisterWellKnownServiceType (new WellKnownServiceTypeEntry (type, objectUri, mode));
    }

    public static void RegisterWellKnownServiceType (WellKnownServiceTypeEntry entry) 
    {
      lock (channelTemplates)
      {
        wellKnownServiceEntries [entry.ObjectUri] = entry;
        RemotingServices.CreateWellKnownServerIdentity (entry.ObjectType, entry.ObjectUri, entry.Mode);
      }
    }

    internal static void RegisterChannelTemplate (ChannelData channel)
    {
      channelTemplates [channel.Id] = channel;
    }
    
    internal static void RegisterClientProviderTemplate (ProviderData prov)
    {
      clientProviderTemplates [prov.Id] = prov;
    }
    
    internal static void RegisterServerProviderTemplate (ProviderData prov)
    {
      serverProviderTemplates [prov.Id] = prov;
    }
    
    internal static void RegisterChannels (ArrayList channels, bool onlyDelayed)
    {
      foreach (ChannelData channel in channels)
      {
        if (onlyDelayed && channel.DelayLoadAsClientChannel != "true")
          continue;
          
        if (defaultDelayedConfigRead && channel.DelayLoadAsClientChannel == "true")
          continue;
          
        if (channel.Ref != null)
        {
          ChannelData template = (ChannelData) channelTemplates [channel.Ref];
          if (template == null) throw new RemotingException ("Channel template '" + channel.Ref + "' not found");
          channel.CopyFrom (template);
        }
        
        foreach (ProviderData prov in channel.ServerProviders)
        {
          if (prov.Ref != null)
          {
            ProviderData template = (ProviderData) serverProviderTemplates [prov.Ref];
            if (template == null) throw new RemotingException ("Provider template '" + prov.Ref + "' not found");
            prov.CopyFrom (template);
          }
        }
        
        foreach (ProviderData prov in channel.ClientProviders)
        {
          if (prov.Ref != null)
          {
            ProviderData template = (ProviderData) clientProviderTemplates [prov.Ref];
            if (template == null) throw new RemotingException ("Provider template '" + prov.Ref + "' not found");
            prov.CopyFrom (template);
          }
        }
        
        ChannelServices.RegisterChannelConfig (channel);
      }
    }
    
    internal static void RegisterTypes (ArrayList types)
    {
      foreach (TypeEntry type in types)
      {
        if (type is ActivatedClientTypeEntry)
          RegisterActivatedClientType ((ActivatedClientTypeEntry)type);
        else if (type is ActivatedServiceTypeEntry)
          RegisterActivatedServiceType ((ActivatedServiceTypeEntry)type);
        else if (type is WellKnownClientTypeEntry)
          RegisterWellKnownClientType ((WellKnownClientTypeEntry)type);
        else if (type is WellKnownServiceTypeEntry)
          RegisterWellKnownServiceType ((WellKnownServiceTypeEntry)type);
      }
    }
    
#if NET_1_1
    public static bool CustomErrorsEnabled (bool isLocalRequest)
    {
      if (_errorMode == "off") return false;
      if (_errorMode == "on") return true;
      return !isLocalRequest;
    }
#endif

    internal static void SetCustomErrorsMode (string mode)
    {
      if (mode == null)
        throw new RemotingException ("mode attribute is required");

      // the mode is case insensitive
      string m = mode.ToLower ();

      if (m != "on" && m != "off" && m != "remoteonly")
        throw new RemotingException ("Invalid custom error mode: " + mode);
        
      _errorMode = m;
    }
  }

  /***************************************************************
   * Internal classes used by RemotingConfiguration.Configure () *
   ***************************************************************/
   
  internal class ConfigHandler : SmallXmlParser.IContentHandler 
  {
    ArrayList typeEntries = new ArrayList ();
    ArrayList channelInstances = new ArrayList ();
    
    ChannelData currentChannel = null;
    Stack currentProviderData = null;
    
    string currentClientUrl = null;
    string appName;
    
    string currentXmlPath = "";
    bool onlyDelayedChannels;
    
    public ConfigHandler (bool onlyDelayedChannels)
    {
      this.onlyDelayedChannels = onlyDelayedChannels;
    }
    
    void ValidatePath (string element, params string[] paths)
    {
      foreach (string path in paths)
        if (CheckPath (path)) return;
        
      throw new RemotingException ("Element " + element + " not allowed in this context");
    }
    
    bool CheckPath (string path)
    {
      CompareInfo ci = CultureInfo.InvariantCulture.CompareInfo;
      if (ci.IsPrefix (path, "/", CompareOptions.Ordinal))
        return path == currentXmlPath;
      else
        return ci.IsSuffix (currentXmlPath, path, CompareOptions.Ordinal);
    }
    
    public void OnStartParsing (SmallXmlParser parser) {}
    
    public void OnProcessingInstruction (string name, string text) {}

    public void OnIgnorableWhitespace (string s) {}

    public void OnStartElement (string name, SmallXmlParser.IAttrList attrs)
    {
      try
      {
        if (currentXmlPath.StartsWith ("/configuration/system.runtime.remoting"))
          ParseElement (name, attrs);
          
        currentXmlPath += "/" + name;
      }
      catch (Exception ex)
      {
        throw new RemotingException ("Error in element " + name + ": " + ex.Message, ex);
      }
    }
    
    public void ParseElement (string name, SmallXmlParser.IAttrList attrs)
    {
      if (currentProviderData != null)
      {
        ReadCustomProviderData (name, attrs);
        return;
      }
      
      switch (name) 
      {
        case "application":
          ValidatePath (name, "system.runtime.remoting");
          if (attrs.Names.Length > 0)
            appName = attrs.Values[0];
          break;
          
        case "lifetime":
          ValidatePath (name, "application");
          ReadLifetine (attrs);
          break;
          
        case "channels":
          ValidatePath (name, "system.runtime.remoting", "application");
          break;
          
        case "channel":
          ValidatePath (name, "channels");
          if (currentXmlPath.IndexOf ("application") != -1)
            ReadChannel (attrs, false);
          else
            ReadChannel (attrs, true);
          break;
          
        case "serverProviders":
          ValidatePath (name, "channelSinkProviders", "channel");
          break;
          
        case "clientProviders":
          ValidatePath (name, "channelSinkProviders", "channel");
          break;
          
        case "provider":
        case "formatter":
          ProviderData prov;
          
          if (CheckPath ("application/channels/channel/serverProviders") ||
            CheckPath ("channels/channel/serverProviders"))
          {
            prov = ReadProvider (name, attrs, false);
            currentChannel.ServerProviders.Add (prov);
          }
          else if (CheckPath ("application/channels/channel/clientProviders") ||
            CheckPath ("channels/channel/clientProviders"))
          {
            prov = ReadProvider (name, attrs, false);
            currentChannel.ClientProviders.Add (prov);
          }
          else if (CheckPath ("channelSinkProviders/serverProviders"))
          {
            prov = ReadProvider (name, attrs, true);
            RemotingConfiguration.RegisterServerProviderTemplate (prov);
          }
          else if (CheckPath ("channelSinkProviders/clientProviders"))
          {
            prov = ReadProvider (name, attrs, true);
            RemotingConfiguration.RegisterClientProviderTemplate (prov);
          }
          else 
            ValidatePath (name);
          break;
          
        case "client":
          ValidatePath (name, "application");
          currentClientUrl = attrs.GetValue ("url");
          break;
          
        case "service":
          ValidatePath (name, "application");
          break;
          
        case "wellknown":
          ValidatePath (name, "client", "service");
          if (CheckPath ("client"))
            ReadClientWellKnown (attrs);
          else
            ReadServiceWellKnown (attrs);
          break;
          
        case "activated":
          ValidatePath (name, "client", "service");
          if (CheckPath ("client"))
            ReadClientActivated (attrs);
          else
            ReadServiceActivated (attrs);
          break;
          
        case "soapInterop":
          ValidatePath (name, "application");
          break;
          
        case "interopXmlType":
          ValidatePath (name, "soapInterop");
          ReadInteropXml (attrs, false);
          break;
          
        case "interopXmlElement":
          ValidatePath (name, "soapInterop");
          ReadInteropXml (attrs, false);
          break;
          
        case "preLoad":
          ValidatePath (name, "soapInterop");
          ReadPreload (attrs);
          break;
          
        case "debug":
          ValidatePath (name, "system.runtime.remoting");
          break;
          
        case "channelSinkProviders":
          ValidatePath (name, "system.runtime.remoting");
          break;
          
        case "customErrors":
          ValidatePath (name, "system.runtime.remoting");
          RemotingConfiguration.SetCustomErrorsMode (attrs.GetValue ("mode"));
          break;
          
        default:
          throw new RemotingException ("Element '" + name + "' is not valid in system.remoting.configuration section");
      }
    }
    
    public void OnEndElement (string name)
    {
      if (currentProviderData != null)
      {
        currentProviderData.Pop ();
        if (currentProviderData.Count == 0) 
          currentProviderData = null;
      }
      
      currentXmlPath = currentXmlPath.Substring (0, currentXmlPath.Length - name.Length - 1);
    }
    
    void ReadCustomProviderData (string name, SmallXmlParser.IAttrList attrs)
    {
      SinkProviderData parent = (SinkProviderData) currentProviderData.Peek ();
      
      SinkProviderData data = new SinkProviderData (name);
      for (int i=0; i < attrs.Names.Length; ++i) 
        data.Properties [attrs.Names[i]] = attrs.GetValue (i);
        
      parent.Children.Add (data);
      currentProviderData.Push (data);
    }

    void ReadLifetine (SmallXmlParser.IAttrList attrs)
    {
      for (int i=0; i < attrs.Names.Length; ++i) {
        switch (attrs.Names[i]) {
        case "leaseTime":
          LifetimeServices.LeaseTime = ParseTime (attrs.GetValue(i));
          break;
        case "sponsorshipTimeout":
          LifetimeServices.SponsorshipTimeout = ParseTime (attrs.GetValue(i));
          break;
        case "renewOnCallTime":
          LifetimeServices.RenewOnCallTime = ParseTime (attrs.GetValue(i));
          break;
        case "leaseManagerPollTime":
          LifetimeServices.LeaseManagerPollTime = ParseTime (attrs.GetValue(i));
          break;
        default:
          throw new RemotingException ("Invalid attribute: " + attrs.Names[i]);
        }
      }
    }
    
    TimeSpan ParseTime (string s)
    {
      if (s == "" || s == null) throw new RemotingException ("Invalid time value");
      
      int i = s.IndexOfAny (new char[] { 'D','H','M','S' });
      
      string unit;
      if (i == -1) 
        unit = "S";
      else { 
        unit = s.Substring (i);
        s = s.Substring (0,i);
      }
      double val;
      
      try {
        val = double.Parse (s);
      }
      catch {
        throw new RemotingException ("Invalid time value: " + s);
      }
      
      if (unit == "D") return TimeSpan.FromDays (val);
      if (unit == "H") return TimeSpan.FromHours (val);
      if (unit == "M") return TimeSpan.FromMinutes (val);
      if (unit == "S") return TimeSpan.FromSeconds (val);
      if (unit == "MS") return TimeSpan.FromMilliseconds (val);
      throw new RemotingException ("Invalid time unit: " + unit);
    }
    
    void ReadChannel (SmallXmlParser.IAttrList attrs, bool isTemplate)
    {
      ChannelData channel = new ChannelData ();
      
      for (int i=0; i < attrs.Names.Length; ++i) 
      {
        string at = attrs.Names[i];
        string val = attrs.Values[i];
        
        if (at == "ref" && !isTemplate)
          channel.Ref = val;
        else if (at == "delayLoadAsClientChannel")
          channel.DelayLoadAsClientChannel = val;
        else if (at == "id" && isTemplate)
          channel.Id = val;
        else if (at == "type")
          channel.Type = val;
        else
          channel.CustomProperties.Add (at, val);
      }
      
      if (isTemplate)
      {
        if (channel.Id == null) throw new RemotingException ("id attribute is required");
        if (channel.Type == null) throw new RemotingException ("id attribute is required");
        RemotingConfiguration.RegisterChannelTemplate (channel);
      }
      else
        channelInstances.Add (channel);
        
      currentChannel = channel;
    }
    
    ProviderData ReadProvider (string name, SmallXmlParser.IAttrList attrs, bool isTemplate)
    {
      ProviderData prov = (name == "provider") ? new ProviderData () : new FormatterData ();
      SinkProviderData data = new SinkProviderData ("root");
      prov.CustomData = data.Children;
      
      currentProviderData = new Stack ();
      currentProviderData.Push (data);
      
      for (int i=0; i < attrs.Names.Length; ++i) 
      {
        string at = attrs.Names[i];
        string val = attrs.Values[i];
        
        if (at == "id" && isTemplate)
          prov.Id = val;
        else if (at == "type")
          prov.Type = val;
        else if (at == "ref" && !isTemplate)
          prov.Ref = val;
        else
          prov.CustomProperties.Add (at, val);
      }
      
      if (prov.Id == null && isTemplate) throw new RemotingException ("id attribute is required");
      return prov;
    }
    
    void ReadClientActivated (SmallXmlParser.IAttrList attrs)
    {
      string type = GetNotNull (attrs, "type");
      string assm = ExtractAssembly (ref type);
      
      if (currentClientUrl == null || currentClientUrl == "") 
        throw new RemotingException ("url attribute is required in client element when it contains activated entries");

      typeEntries.Add (new ActivatedClientTypeEntry (type, assm, currentClientUrl));
    }
    
    void ReadServiceActivated (SmallXmlParser.IAttrList attrs)
    {
      string type = GetNotNull (attrs, "type");
      string assm = ExtractAssembly (ref type);
      
      typeEntries.Add (new ActivatedServiceTypeEntry (type, assm));
    }
    
    void ReadClientWellKnown (SmallXmlParser.IAttrList attrs)
    {
      string url = GetNotNull (attrs, "url");
      string type = GetNotNull (attrs, "type");
      string assm = ExtractAssembly (ref type);
      
      typeEntries.Add (new WellKnownClientTypeEntry (type, assm, url));
    }
    
    void ReadServiceWellKnown (SmallXmlParser.IAttrList attrs)
    {
      string objectUri = GetNotNull (attrs, "objectUri");
      string smode = GetNotNull (attrs, "mode");
      string type = GetNotNull (attrs, "type");
      string assm = ExtractAssembly (ref type);
      
      WellKnownObjectMode mode;
      if (smode == "SingleCall") mode = WellKnownObjectMode.SingleCall;
      else if (smode == "Singleton") mode = WellKnownObjectMode.Singleton;
      else throw new RemotingException ("wellknown object mode '" + smode + "' is invalid");
      
      typeEntries.Add (new WellKnownServiceTypeEntry (type, assm, objectUri, mode));
    }
    
    void ReadInteropXml (SmallXmlParser.IAttrList attrs, bool isElement)
    {
      Type t = Type.GetType (GetNotNull (attrs, "clr"));
      string[] xmlName = GetNotNull (attrs, "xml").Split (',');
      string localName = xmlName [0].Trim ();
      string ns = xmlName.Length > 0 ? xmlName[1].Trim() : null;
      
      if (isElement) SoapServices.RegisterInteropXmlElement (localName, ns, t);
      else SoapServices.RegisterInteropXmlType (localName, ns, t);
    }
    
    void ReadPreload (SmallXmlParser.IAttrList attrs)
    {
      string type = attrs.GetValue ("type");
      string assm = attrs.GetValue ("assembly");
      
      if (type != null && assm != null)
        throw new RemotingException ("Type and assembly attributes cannot be specified together");
        
      if (type != null)
        SoapServices.PreLoad (Type.GetType (type));
      else if (assm != null)
        SoapServices.PreLoad (Assembly.Load (assm));
      else
        throw new RemotingException ("Either type or assembly attributes must be specified");
    }
          
    string GetNotNull (SmallXmlParser.IAttrList attrs, string name)
    {
      string value = attrs.GetValue (name);
      if (value == null || value == "") 
        throw new RemotingException (name + " attribute is required");
      return value;
    }
    
    string ExtractAssembly (ref string type)
    {
      int i = type.IndexOf (',');
      if (i == -1) return "";
      
      string asm = type.Substring (i+1).Trim();
      type = type.Substring (0, i).Trim();
      return asm;
    }
    
    public void OnChars (string ch) {}
    
    public void OnEndParsing (SmallXmlParser parser)
    {
      RemotingConfiguration.RegisterChannels (channelInstances, onlyDelayedChannels);
      if (appName != null) RemotingConfiguration.ApplicationName = appName;
      
      if (!onlyDelayedChannels)
        RemotingConfiguration.RegisterTypes (typeEntries);
    }
  }


    /*******************************************************************
         * Internal data structures used by ConfigHandler, to store             *
         * machine.config's remoting related data.                         *
         * If having them implemented this way, makes configuration too    *
         * slow, we can use string arrays.                                 *
         *******************************************************************/
     
  internal class ChannelData {
    internal string Ref;
    internal string Type;
    internal string Id;
    internal string DelayLoadAsClientChannel;
    
    ArrayList _serverProviders = new ArrayList ();
    ArrayList _clientProviders = new ArrayList ();
    Hashtable _customProperties = new Hashtable ();
    
    internal ArrayList ServerProviders {
      get {
        if (_serverProviders == null) _serverProviders = new ArrayList ();
        return _serverProviders;
      }
    }
    
    public ArrayList ClientProviders {
      get {
        if (_clientProviders == null) _clientProviders = new ArrayList ();
        return _clientProviders;
      }
    }
    
    public Hashtable CustomProperties {
      get {
        if (_customProperties == null) _customProperties = new Hashtable ();
        return _customProperties;
      }
    }
    
    public void CopyFrom (ChannelData other)
    {
      if (Ref == null) Ref = other.Ref;
      if (Id == null) Id = other.Id;
      if (Type == null) Type = other.Type;
      if (DelayLoadAsClientChannel == null) DelayLoadAsClientChannel = other.DelayLoadAsClientChannel;

      if (other._customProperties != null)
      {
        foreach (DictionaryEntry entry in other._customProperties)
          if (!CustomProperties.ContainsKey (entry.Key))
            CustomProperties [entry.Key] = entry.Value;
      }
      
      if (_serverProviders == null && other._serverProviders != null)
      {
        foreach (ProviderData prov in other._serverProviders)
        {
          ProviderData np = new ProviderData();
          np.CopyFrom (prov);
          ServerProviders.Add (np);
        }
      }
      
      if (_clientProviders == null && other._clientProviders != null)
      {
        foreach (ProviderData prov in other._clientProviders)
        {
          ProviderData np = new ProviderData();
          np.CopyFrom (prov);
          ClientProviders.Add (np);
        }
      }
    }
  }
  
  internal class ProviderData {
    internal string Ref;
    internal string Type;
    internal string Id;
    
    internal Hashtable CustomProperties = new Hashtable ();
    internal IList CustomData;
    
    public void CopyFrom (ProviderData other)
    {
      if (Ref == null) Ref = other.Ref;
      if (Id == null) Id = other.Id;
      if (Type == null) Type = other.Type;
      
      foreach (DictionaryEntry entry in other.CustomProperties)
        if (!CustomProperties.ContainsKey (entry.Key))
          CustomProperties [entry.Key] = entry.Value;
          
      if (other.CustomData != null)
      {
        if (CustomData == null) CustomData = new ArrayList ();
        foreach (SinkProviderData data in other.CustomData)
          CustomData.Add (data);
      }
    }
  }
  
  internal class FormatterData: ProviderData {
  }  
}
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