Citrix receiver architecture.Citrix ICA Virtual Channels Overview

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Citrix ICA Virtual Channels Overview.Applicable Products

 

Whether for graphics, disks, COM ports, LPT ports, printers, audio, video, smart card or even third-party custom virtual channels, virtual channels are an integral part of the Remote Computing experience with XenApp Server. From time to time, new virtual channels are released with a new version of the XenApp Server and Receiver products to provide additional functionality. A virtual channel consists of a client-side virtual driver that communicates with a server-side application.

XenApp products ship with various included virtual channels and are designed to allow customers and third-party vendors to create their own virtual channels by using one of the provided Software Development Kits SDKs. Virtual channels provide a secure way to accomplish a variety of tasks, for example, an application running on a XenApp Server communicating with a client-side device or an application communicating with the client-side environment.

On the client side, virtual channels correspond to virtual drivers; each providing a specific function. Some are required for normal operation, and others are optional. Virtual drivers operate at the presentation layer protocol level. There can be a number of these protocols active at any given time by multiplexing channels that are provided by the WinStation protocol layer. Note : It is possible to disable specific client functionality by removing one or more of these values.

For example, if you wanted to remove Client Clipboard functionality, edit the above registry key, and remove the word, Clipboard. Note : Some virtual channels are compiled into other files, for example Clipboard Mapping is available in wfica With most of the binaries compiled for 32 bit, following client files have bit compiled equivalents:. Generic USB virtual channel implementation uses 2 kernel mode drivers: ctxusbm.

The user mode virtual channel support on the server side is loaded by Wfshell. Starting with XA 7. Ctxgfx hosts platform specific modules which interact with corresponding driver Icardd. Ctxgfx loads specialized adaptor modules to interact with the OEM graphics driver. Such hosting provide one-to-many semantics for multiple applications in a session as well as multiple sessions on the server.

Examples of such services include:. All client virtual channels are routed through the WinStation Driver, Wdica.

The following image illustrates the virtual channel client-server connection. Creating a virtual channel using the Virtual Channel SDK requires intermediate programming knowledge. It is best to use this method when it is necessary to provide a major communication path between the client and the server.

For example, if you are implementing usage of a device on the client side, such as a scanner, to be used with a process in the session. Note : Because of enhanced security starting with the As the inherent nature of latency and other factors such as compression and decompression and rendering being performed at each hop, some areas of functionality might be affected slightly in terms of performance with each additional hop that the client undergoes.

These areas are:. Note : By default, the client drives mapped by an instance of the client running in a Pass-through session are restricted to Client drives of the connecting client. Specifically, on the XenDesktop server, there is a VDA Hook that runs, named, picaPassthruHook, whose sole purpose is to make the client believe it is running on a CPS server, thus placing the client into its traditional Pass-through mode. Securing usage is an important part of planning, developing and implementing virtual channels.

There are several references to specific areas of security located throughout this document. Virtual Channels should be opened at Connect and Reconnect time, and closed at logoff and Disconnect time. Keep the following guidelines in mind when you create scripts that use virtual channel functions:.

You can create a maximum of 32 virtual channels. Seventeen of these are reserved for special purposes. In some previous versions of the ICA protocol, virtual channels were numbered; the numbers are now assigned dynamically based on the ASCII name, making implementation easier.

Users developing virtual channel code for internal use only can use any seven-character name that does not conflict with existing virtual channels. Follow the existing naming convention when adding your own virtual channels. There are several predefined channels. In this network, you can find access to SDKs, sample code and scripts, extensions and plug-ins, and SDK documentation. Failed to load featured products content, Please try again.

Customers who viewed this article also viewed. Log in to Verify Download Permissions. Description of ICA Virtual Channels On the client side, virtual channels correspond to virtual drivers; each providing a specific function. Refer to the Disclaimer at the end of this article before using Registry Editor.

With most of the binaries compiled for 32 bit, following client files have bit compiled equivalents: brapi Others are loaded as Kernel mode, for example: CtxDvcs. Following is an overview of client-server data exchange using a virtual channel. The client passes information about the virtual channels it supports to the server.

The server-side application starts, obtains a handle to the virtual channel, and optionally queries for additional information about the channel. The client virtual driver and server-side application pass data using the following two methods: If the server application has data to send to the client, the data is sent to the client immediately.

When the data is received by the client, the WinStation driver de-multiplexes the virtual channel data from the ICA stream and immediately passes it to the client virtual driver.

If the client virtual driver has data to send to the server, the data is sent the next time the WinStation driver polls it. When the data is received by the server, it is queued until the virtual channel application reads it. There is no way to alert the server virtual channel application that data was received.

When the server virtual channel application is completed, it closes the virtual channel and frees any allocated resources. Security and ICA Virtual Channels Securing usage is an important part of planning, developing and implementing virtual channels.

Best Practices The following are some pointers to keep in mind when using virtual channels: Virtual Channels should be opened at Connect and Reconnect time, and closed at logoff and Disconnect time. Keep the following guidelines in mind when you create scripts that use virtual channel functions: Naming the Virtual Channels You can create a maximum of 32 virtual channels.

Virtual channel names must not be more than seven characters in length. The first three characters are reserved for the vendor name, and the next four for the channel type. Using Registry Editor incorrectly can cause serious problems that might require you to reinstall your operating system.

Citrix cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

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Citrix receiver architecture.Reference Architectures

 

IT wants to provide the office-based employees with the flexibility of working remotely as needed. The company has always had a subset of remote users relying on an on-premises Citrix Virtual Apps and Desktops environment. This reference architecture explains how to plan a cost-effective solution with a business continuity strategy in place. In this document, we use the Citrix Architectural Design Framework to organize and present the leading practices, recommendations, and design patterns which are used by Citrix.

The combination of Citrix Cloud services and Microsoft Azure makes it possible to spin up new Citrix virtual resources with greater agility and elasticity, adjusting usage as requirements change.

Virtual Machines on Azure support all the control and workload components required for a Citrix Virtual Apps and Desktops service deployment. Citrix Cloud services and Microsoft Azure have common control plane integrations that establish identity, governance, and security for global operations. This document also provides guidance on prerequisites, architecture design considerations, and deployment guidance for customer environments.

The document highlights the design decisions and deployment considerations across the five key architectural principles. Organizations of all shapes and sizes are making the move to the cloud and subscription based managed services.

For organizations who are all in on the cloud, the Cloud Forward design pattern is a great match. The Cloud Forward design pattern uses state of the art, cloud-delivered services from Citrix and Google. Learn how to design an environment to support a mergers and acquisition strategy without compromising IT security.

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