Systems and methods for multiplexing network channels

• US 8,996,657 B2
• Filed: 08/18/2011
• Issued: 03/31/2015
• Est. Priority Date: 09/01/2010
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Verma, Basant, Piazza, Kevin, Hsu, Weichin Lo
• Primary Examiner(s): BAYARD, DJENANE M
• Application Number:
  US13/212,995
• Publication Number:
  US 20120054851A1
• Time in Patent Office: 1,321 Days
• US Class Current: 709/218
• CPC Class Codes: H04L 63/0209 Architectural arrangements, e.g. perimeter networks or demilitarized zones
• CPC Class Codes: H04L 63/0281 Proxies
• CPC Class Codes: H04L 63/164 at the network layer
• CPC Class Codes: H04L 67/02 based on web technology, e.g. hypertext transfer protocol [HTTP]
• CPC Class Codes: H04L 67/566 Grouping or aggregating service requests, e.g. for unified processing
• CPC Class Codes: H04L 69/163 In-band adaptation of TCP data exchange; In-band control procedures

Abstract

A proxy consolidates multiple TCP requests from clients into one TCP connection between a proxy and server. A persistent TCP connection is opened between the proxy and server, and a connection request is received from a client at the proxy. A unique identifier is registered for the client, and the server is signaled over the persistent connection to register the unique identifier. A client connection is established between the client and proxy responsive to the connection request. A content request is received from the client over the client connection. The unique identifier is prepended to the content request, the prepended content request is forwarded to the server, and prepended content is received from the server. The identifier and the content are extracted from the prepended content, and a client and a client connection are identified that correspond to the extracted identifier. The extracted content is returned to the corresponding client.

Claims

1. A method for TCP multiplexing over a proxy, wherein the proxy consolidates multiple TCP requests from clients into one TCP connection between the proxy and a server, the method comprising:

opening a persistent TCP connection between a proxy and a server;

receiving a connection request from a client at the proxy;

assigning a unique identifier to the client at the proxy;

signaling the server over the persistent TCP connection to register the unique identifier of the client;

receiving outgoing data from the client at the proxy;

prepending the unique identifier of the client to the outgoing data at the proxy;

forwarding the prepended outgoing data from the proxy to the server over the persistent TCP connection;

receiving incoming data from the server at the proxy over the persistent TCP connection, wherein the incoming data includes the unique identifier of the client;

extracting the unique identifier from the incoming data at the proxy;

identifying the client and a corresponding client connection based on the extracted unique identifier; and

sending at least some of the incoming data to the client over the corresponding client connection.

2. A method according to claim 1, the method further comprising, at the proxy, associating a port of the proxy with the client and the unique identifier of the client.

3. The method according to claim 2, wherein the identifying of the corresponding client connection based on the extracted unique identifier is based at least in part on the port of the proxy that is associated with the extracted unique identifier.

4. A method according to claim 1, the method further comprising removing the unique identifier from the incoming data before sending the incoming data to the client over the corresponding client connection.

5. A method according to claim 1, further comprising composing a command sequence which includes a command to register the client and the unique identifier of the client, wherein signaling the server comprises sending the command sequence over the persistent TCP connection to the server.

6. A method according to claim 1, the method further comprising composing a command sequence which includes a command to return data, the unique identifier of the client, and the outgoing data from the client, wherein forwarding the prepended outgoing data comprises sending the command sequence from the proxy to the server.

7. A method according to claim 1, the method further comprising receiving a request from the client to close the client connection.

8. A method according to claim 7, wherein responsive to the request from the client to close the client connection, the method further comprises:

canceling the assignment of the unique identifier to the client; and

signaling the server over the persistent TCP connection to unregister the unique identifier.

9. A proxy which consolidates multiple TCP requests from clients into one TCP connection between the proxy and a server, the proxy comprising:

a computer-readable memory constructed to store computer-executable process steps; and

a processor constructed to execute the computer-executable process steps stored in the memory;

wherein the process steps stored in the memory cause the processor to perform TCP multiplexing, and wherein the process steps stored in the memory include computer-executable steps to;

open a persistent TCP connection between the proxy and the server;

receive a connection request from a client at the proxy, wherein the connection request comprises a request for establishment of a new connection between the client and the server;

assign a unique identifier to the client;

signal the server over the persistent TCP connection to register the unique identifier of the client;

receive a data request from the client, wherein the data request comprises a request for data on the server;

prepend the unique identifier of the client to the data request;

forward the prepended data request to the server over the persistent TCP connection;

receive prepended data from the server over the persistent TCP connection, wherein the prepended data includes an identifier prepended to incoming data;

extract the identifier and the incoming data from the prepended data;

identify a client and a client connection that correspond to the extracted identifier; and

send at least some of the extracted incoming data to the client that corresponds to the extracted identifier.

10. A proxy according to claim 9, wherein the process step to open the persistent TCP connection between the proxy and the server comprises exchanging an ECHO command between the server and the proxy.

11. The proxy according to claim 9, wherein the server and the proxy are separated by a firewall which exposes the proxy to incoming connection requests and which shields the server from such requests, and wherein the step to open the persistent TCP connection between the proxy and the server comprises receipt of an ECHO command from the server and a response thereto from the proxy.

12. A proxy according to claim 9, the process steps stored in the memory further including computer-executable steps to close the persistent TCP connection between the server and the proxy.

13. A proxy according to claim 9, the process steps stored in the memory further including computer-executable steps to compose a command sequence which includes a command to register the client and the unique identifier of the client, wherein the step to signal the server comprises sending the command sequence over the persistent TCP connection to the server.

14. A proxy according to claim 9, the process steps stored in the memory further including computer-executable steps to compose a command sequence which includes a command to return data, the unique identifier of the client, and the data request from the client, wherein the step to forward the prepended data request comprises sending the command sequence to the server.

15. A proxy according to claim 9, the process steps stored in the memory further including computer-executable steps to receive a request from the client to close the client connection.

16. A proxy according to claim 15, wherein responsive to the request from the client to close the client connection, the process steps stored in the memory further including computer-executable steps to:

cancel the assignment of the unique identifier to the client; and

signal the server over the persistent TCP connection to unregister the unique identifier.

17. One or more computer-readable memory media on which is stored computer-executable instructions for causing one or more computing device to perform operations for TCP multiplexing over a proxy, wherein the proxy consolidates multiple TCP requests from clients into one TCP connection between the proxy and a server, the operations comprising:

opening a persistent TCP connection between a proxy and a server;

receiving a connection request from a client at the proxy, wherein the connection request comprises a request for establishment of a connection between the client and the server;

assigning a unique identifier to the client;

signaling the server over the persistent TCP connection to register the unique identifier for the client;

receiving outgoing data from the client at the proxy;

prepending the unique identifier of the client to the outgoing data at the proxy;

forwarding the prepended outgoing data from the proxy to the server over the persistent TCP connection;

receiving prepended incoming data at the proxy from the server over the persistent TCP connection, wherein the prepended incoming data includes an identifier prepended to incoming data;

extracting the identifier and the incoming data from the prepended incoming data;

identifying a client that corresponds to the extracted identifier; and

sending the extracted incoming data to the client that corresponds to the extracted identifier.

18. A method for communicating among a first information apparatus and a server device via an HTTP tunnel, the method being performed by a computing device, the method comprising:

establishing at least one HTTP tunnel with a server device;

assigning a first identifier to a first information apparatus;

sending a message to the server device over the HTTP tunnel to register the first identifier of the first information apparatus;

receiving first data from the first information apparatus;

prepending the first identifier to the first data;

sending the first data, with the prepended first identifier, to the server device in accordance with a predetermined communication protocol within the HTTP tunnel;

receiving second data from the server device over the HTTP tunnel, wherein the second data includes the first identifier of the first information apparatus;

extracting the first identifier from the second data;

identifying the first information apparatus and a corresponding client connection based on the extracted first identifier; and

sending at least some of the second data to the first information apparatus over the corresponding client connection.

19. A communication method according to claim 18, further comprising:

associating a port with the first identifier of the first information apparatus,

wherein identifying the first information apparatus and the corresponding client connection based on the extracted first identifier is based at least in part on the port that is associated with the first identifier.

20. A communication method according to claim 19, further comprising:

recording the first identifier in a proxy table, wherein, in the proxy table, the first identifier is associated with the first information apparatus and with the port; and

recording a second identifier in the proxy table, wherein, in the proxy table, the second identifier is associated with a second information apparatus and with a second port.