Employing an auxiliary device to implement USB device redirection
An auxiliary device can be employed to implement USB device redirection. By employing an auxiliary device, a USB device may be redirected to a server for use by a client terminal within a remote session even if the client terminal alone is not capable of redirecting the USB device. The remoting components tasked with establishing remote sessions can include a client-side or server-side session notifier. This session notifier can be configured to notify a proxy on the auxiliary device when the client terminal establishes a remote session with the server. In response to this notification, the proxy on the auxiliary device can commence redirecting an appropriate USB device to the server. Then, when the remote session is terminated, the session notifier can notify the proxy to allow the proxy to cease redirecting the USB device.
1. A method, performed in a virtual desktop infrastructure (“VDI”) environment, for employing an auxiliary device to implement USB device redirection, the method comprising:
receiving, at a proxy of the auxiliary device, a first notification that includes information about a first remote session that has been established between a first client terminal and a server, the auxiliary device, the first client terminal and the server being distinct computing devices, the first notification being received in conjunction with the establishment of the first remote session between the first client terminal and the server, the first notification being received from a session notifier that executes on either the first client terminal or the server;
processing the information in the first notification to identify a USB device to be redirected to the server for access within the first remote session established between the first client terminal and the server, the USB device being coupled to the auxiliary device but not coupled to the first client terminal; and
commencing the redirection of the USB device from the auxiliary device to the server to allow the first client terminal to access the USB device from within the first remote session such that the USB device is accessible within the first remote session established between the first client terminal and the server even though the USB device is coupled to the auxiliary device that is a distinct computing device from the first client terminal and the server.
2. The method of claim 1 , wherein the session notifier executes on the first client terminal.
3. The method of claim 1 , wherein the session notifier executes on the server.
4. The method of claim 1 , wherein the first notification includes one or more of:
an IP address of the first client terminal;
an IP address of the server;
an IP address of a gateway;
a protocol employed to establish the first remote session; or
a session ID of the first remote session.
5. The method of claim 4 , wherein processing the information in the first notification to identify a USB device to be redirected to the server for access within the first remote session comprises determining that the IP address of the first client terminal is associated with the USB device.
6. The method of claim 4 , wherein commencing the redirection of the USB device to the server comprises employing the IP address of server and/or the IP address of the gateway to redirect the USB device to the server.
7. The method of claim 4 , wherein commencing the redirection of the USB device to the server comprises sending the session ID of the first remote session to the server to allow the server to restrict access to the USB device based on the session ID.
8. The method of claim 7 , wherein restricting access to the USB device comprises allowing the USB device to be accessed only within the first remote session.
9. The method of claim 4 , wherein the USB device is redirected using the protocol specified in the first notification.
10. The method of claim 1 , wherein the first notification is received in response to the first remote session being established or in response to a request to redirect the USB device after the first remote session has been established.
11. The method of claim 1 , further comprising:
receiving, at the proxy, a second notification that indicates that the first remote session has been terminated, the second notification being received from the session notifier that executes on either the first client terminal or the server; and
ceasing the redirection of the USB device.
12. The method of claim 1 , further comprising:
receiving, at the proxy, a second notification that includes information about a second remote session that has been established between a second client terminal and the server, the second notification being received from a session notifier that executes on either the second client terminal or the server;
processing the information in the second notification to identify that the USB device is to be redirected to the server for access within the second remote session;
determining that the USB device is already being redirected to the server; and
sending information to the server indicating that the USB device should be accessible from within the second remote session.
13. The method of claim 12 , further comprising:
receiving, at the proxy, a third notification that indicates that the second remote session has been terminated, the third notification being received from the session notifier that executes on either the second client terminal or the server;
determining that the USB device is being redirected for access within the first remote session; and
continuing to redirect the USB device to the server.
14. The method of claim 13 , further comprising:
sending a session ID of the second remote session to the server to allow the server to prevent the USB device from being accessed from within a remote session that is assigned the session ID.
15. A virtual desktop infrastructure (“VDI”) environment comprising:
a server;
a client terminal that is configured to establish remote sessions with the server; and
an auxiliary device to which one or more USB devices are connected and that is configured to redirect the one or more USB devices to the server for access by the client terminal from within a remote session established between the client terminal and the server,
wherein either the server or the client terminal includes a session notifier that sends a first notification to a proxy on the auxiliary device when a remote session is established between the client terminal and the server and sends a second notification to the proxy when the remote session is terminated; and
wherein the proxy is configured to employ information contained in the first notification to identify at least one of the one or more USB devices to redirect to the server, the proxy also being configured to employ the information contained in the first notification to establish a connection with the server over which the at least one of the one or more USB devices is redirected, the proxy further being configured to employ information contained in the second notification to cease redirecting the at least one of the one or more USB devices.
16. The VDI environment of claim 15 , wherein the first notification includes one or more of:
an IP address of the client terminal;
an IP address of the server;
an IP address of a gateway;
a protocol employed to establish the remote session; or
a session ID of the remote session.
17. The VDI environment of claim 16 , wherein employing information contained in the first notification to identify at least one of the one or more USB devices to redirect to the server comprises determining that the IP address of the client terminal is associated with the at least one of the one or more USB devices.
18. One or more computer storage media storing computer executable instructions which when executed in a virtual desktop infrastructure (“VDI”) environment implement a method for employing an auxiliary device to implement USB device redirection, the method comprising:
detecting, by a session notifier executing on either a server or a client terminal, that a remote session has been established between the server and the client terminal;
obtaining, by the session notifier, information about the remote session;
sending, by the session notifier, a notification to a proxy on the auxiliary device, the notification including the information about the remote session, wherein the auxiliary device, the client terminal and the server are distinct computing devices;
processing, by the proxy, the information included in the notification to identify one or more USB devices that are to be redirected to the server for access within the remote session established between the server and the client terminal; and
employing, by the proxy, the information included in the notification to commence redirecting the one or more USB devices to the server such that the one or more USB devices are accessible within the remote session established between the server and the client terminal even though the one or more USB devices are coupled to the auxiliary device that is a distinct computing device from the client terminal and the server.
19. The computer storage media of claim 18 , wherein the information included in the notification comprises one or more of:
an IP address of the client terminal;
an IP address of the server;
an IP address of a gateway;
a protocol employed to establish the remote session;
a session ID of the remote session; or
an identifier of each of the one or more USB devices.
20. The computer storage media of claim 18 , wherein the method further comprises:
detecting, by the session notifier, that the remote session has been terminated;
sending, by the session notifier, a second notification to the proxy, the second notification indicating that the remote session has been terminated; and
in response to receiving the second notification, ceasing, by the proxy, the redirection of the one or more USB devices.