CSharp Components
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Back: CSharp Reference Implementation
Table of Contents
Overview
The Direct C# Reference implementation supplies :
- A reusable object model and class library
- Out of the box components
The C# Direct Object Model implements the Direct protocol. It is designed as a set of reusable classes that you can incorporate into your products to build fully customized Direct nodes.
The Direct components listed (services, exes) below use the object model to create turn-key exemplar implementations you may use as is, or refer to as samples or sample source code.
Object Model and Libraries
Xml Documentation
The Object Model source is well documented.
- The build automatically compiles documentation embedded in the source into Xml Documents.
- You can transform these documents into MSDN style docs using open source tools like Sandcastle
If you have Sandcastle installed, you can use the helper csharp\build\sc_help.bat batch file.
Health.Direct.Common.dll
Contains object model for implementing and managing:
- S/MIME Crypto
- Certificates & Anchors
- Certificate Resolvers, including Dns
- Messaging
- MIME Parsing/Serialization
- Mail Parsing/Serialization
- MDN
- DNS
- Parsing/Serialization
- DNS Resolver - TCP & UDP
- Routing
- Caching
- Diagnostics
- IOC Container
- Useful Extensions
- Etc
Source code
csharp\common
Binaries
csharp\common\bin
Dependencies
None
Health.Direct.Agent.dll
- Direct Security Agent
- Domains and MailAddresses
- Trust Model
- Trust Chain Validation
Source code
csharp\agent
Binaries
csharp\agent\bin
Dependencies
- Health.Direct.Common.dll
Health.Direct.DnsResponder.dll
Implements a multi-threaded DNS server that is hosted by the Direct Dns Windows Service.
- Socket Server/services
- Dns TCP Responder
- Dns UDP Responder
Source code
csharp\dnsresponder
Binaries
csharp\dnsresponder\bin\debug
Dependencies
- Health.Direct.Common.dll
- Health.Direct.Config.Client.dll
Health.Direct.Config.Store.dll
Data access layer and object model over the Direct Database.
- Certificates
- Trust Anchors
- Domains
- Addresses
- Dns Records
- Blobs
- Properties
Used by the Config WCF Middle Tier service, which is a thin WCF wrapper around the objects in this assembly.
Source code
csharp\config\store
Binaries
csharp\config\bin
Dependencies
- Health.Direct.Common.dll
Health.Direct.Config.Client.dll
All .NET Direct components interact with the middle using this assembly.
- Canned, pre-built WCF Proxies so you don't have to generate them yourself
- Extension methods to simplify some access patterns
- Simplified WCF configuration that works
- Wrapper Business logic [in process of being migrated out of ConfigConsole.exe]
Source code
csharp\config\client
Binaries
csharp\config\client\bin
Dependencies
- Health.Direct.Common.dll
- Health.Direct.Config.Store.dll
Health.Direct.Diagnostics.NLog.dll
Integrates NLog, the popular .NET Open Source logging framework.
Source code
csharp\diagnostics
Binaries
csharp\diagnostics\bin
Dependencies
- Health.Direct.Common.dll
- NLog.dll
Direct Gateway
The Direct Gateway integrates the Direct Security Agent with the the free Smtp Server service in Windows 2008/2003. It adds additional Smtp Server specific logic and hooks.
- Automatically applies and enforces the Direct protocol and security model on all incoming and outbound messages.
- Integrates with Config Middle Tier
- Address/Domain verification
- Message Routing
You can use the Gateway standalone, or you can set it up to work with the Config Middle Tier.
Health.Direct.SmtpAgent.dll
This assembly implements the Gateway entirely in C#. It works with message objects exposed by Smtp Server using COM Interop.
- You can use the SmtpAgent or other classes directly.
Source code
- csharp\gateway\smtpagent
Binaries
- csharp\gateway\smtpagent\bin
Dependencies
- Health.Direct.Common.dll
- Health.Direct.Agent.dll
- Health.Direct.Config.Client.dll
- Health.Direct.Config.Store.dll
- Interop.ADODB.dll
- Interop.CDO.dll
smtpEventHandler.dll
- A tiny COM C++ hook that subscribes to SMTP Server events.
- Invokes Health.Direct.SmtpAgent.dll
Source code
- csharp\gateway\smtpEventHandler
Binaries
- csharp\gateway\smtpeventhandler\bin
Dependencies
None.
Config Web Service
This WCF service provides CRUD interfaces for the Direct Database store. Interfaces exist to manage:
- Certificates
- Anchors
- Addresses
- Domains
- DNS Records
- Blobs
- Properties
The service is a very thin layer over Health.Direct.Config.Store.dll, which does the actual work of interacting with the database.
Source Code
- csharp\config\service
Binaries
Health.Direct.Config.Service.dll
- csharp\config\service\bin
- csharp\config\service\*.svc*
Dependencies
- Health.Direct.Common.dll
- Health.Direct.Config.Store.dll
- Health.Direct.Diagnostics.NLog.dll
- NLog.dll
Dns Web Service
The WCF Dns Web Service - provides read-only access to Dns Records stored in the Direct Database. The Direct DNS Server calls this web service to retrieve data.
Source Code
csharp\dnsresponder.service
Binaries
Health.Direct.DnsResponder.Service.dll
- csharp\dnsresponder.service\bin
- csharp\dnsresponder.service\*.svc*
Direct Dns Server
The Direct DNS Server is a multi-threaded Dns server distinguished by the following features:
- Supports CERT records, unlike Windows DNS Server
- Seamless integration with Direct Config Middle Tier
- Automatically serves up stored certificates
- You manage and configure your Dns needs using the same centralized repository as the rest of the system
- No Zone files or other bindings required
- Full Support for both TCP & UDP responders
The Direct DNS Server is a Windows Service. It is a thin wrapper around Health.Direct.DnResponder.dll - which contains all the actual server logic.
The server comes with a built in Installer.
- You can install it using the .NET Framework utility installutil.exe
Source Code
- csharp\windows services\dnsResponder.winsrv
Binaries
DirectDnsResponderSvc.exe
- csharp\dnsresponder\bin
Dependencies
- Health.Direct.DnsResponder.dll
- Health.Direct.Common.dll
- Health.Direct.Config.Client.dll
- Health.Direct.Config.Store.dll
- Health.Direct.Diagnostics.NLog.dll
- NLog.dll
Management Tools
ConfigConsole
The ConfigConsole is a command line application used to manage the system. It does this by calling the WCF Config Middle Tier service.
Source Code
- csharp\config\console
Dependencies
- Health.Direct.Common.dll
- Health.Direct.Config.Store.dll
- Health.Direct.Diagnostics.NLog.dll
- NLog.dll