Performing message and transformation adapter functions in a network element on behalf of an application

• US 20060106941A1
• Filed: 11/17/2004
• Published: 05/18/2006
• Est. Priority Date: 11/17/2004
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Potti, Sunil, Singhal, Pravin, Oleson, Parley Van, Kothambawala, Juzar, Li, Qingqing, Tung, Wai Yip
• Granted Patent: US 7,509,431 B2
• Time in Patent Office: Days
• US Class Current: 709/238
• CPC Class Codes: H04L 67/56 Provisioning of proxy services store-and-forward switching systems in data switching networks H04L12/54
• CPC Class Codes: H04L 67/565 Conversion or adaptation of application format or content adding application control or application functional data H04L67/561

Abstract

A method is disclosed for performing message and transformation adapter functions in a network element on behalf of an application. According to one aspect, the network element determines an application layer message that is collectively contained in payload portions of data packets. The application layer message conforms to an application layer protocol, such as Hypertext Transfer Protocol (HTTP). The network element determines the application layer protocol to which the application layer message conforms. Based on the application layer protocol, an adapter is selected from among a plurality of adapters that are accessible to the network element. The application layer message is provided to the selected adapter, which converts the application layer message into a “canonical” message that is not specific to any particular application layer protocol.

Claims

1. A method of performing transformation adapter functions in a network element, the method comprising the computer-implemented steps of:

determining, at the network element, a first application layer message that is contained in one or more payload portions of one or more data packets, wherein the first application layer message conforms to a first application layer protocol;

determining the first application layer protocol;

selecting, based on the first application layer protocol, a first adapter from among a plurality of adapters that are accessible to the network element; and

providing the first application layer message as input to the first adapter, wherein the first adapter converts the first application layer message into a second message that does not conform to the first application layer protocol.

2. A method as recited in claim 1, further comprising:

intercepting the one or more data packets at the network element, wherein the one or more data packets are destined for an application that is hosted on a device other than the network element.

3. A method as recited in claim 1, further comprising:

reading the first application layer message from a data repository that is external to the network element, wherein the first application layer message was stored in the data repository by an application that is hosted on a device other than the network element.

4. A method as recited in claim 3, wherein the data repository is a message queue, and wherein reading the first application layer message comprises:

determining whether the message queue contains any application layer messages; and

in response to determining that the message queue contains an application layer message, reading the first application layer message from the message queue and removing the first application layer message from the message queue.

5. A method as recited in claim 1, further comprising:

reading the first application layer message from a transmission queue into which are stored application layer messages that an application sends to a message queue alias, wherein the message queue alias appears to the application to be a remote destination message queue from which a remote destination application reads application layer messages, and wherein the transmission queue is separate from the remote destination message queue.

6. A method as recited in claim 5, further comprising:

converting the second message into a third application layer message that conforms to an application layer protocol; and

sending the third application layer message toward a broker that stores the third application layer message into the remote destination message queue.

7. A method as recited in claim 1, further comprising:

determining, based on the second message, a message classification;

selecting, based on the message classification, a second adapter from among the plurality of adapters; and

providing the second message as input to the second adapter, wherein the second adapter converts the second message into a third application layer message that conforms to a second application layer protocol.

8. A method as recited in claim 7, wherein the second application layer protocol differs from the first application layer protocol.

9. A method as recited in claim 7, wherein the second adapter sends the third application layer message toward a broker that stores the third application layer message into a destination message queue that is external to the network element and from which a destination application reads application layer messages.

10. A method as recited in claim 1, wherein determining the first application layer protocol comprises:

determining a Transmission Control Protocol (TCP) port on which the one or more data packets were received; and

determining, based on mapping information, that the TCP port is associated with the first application layer protocol.

11. A method as recited in claim 1, further comprising:

receiving, at the network element, program code that implements the first adapter; and

in response to receiving the program code, storing the program code at the network element.

12. A method as recited in claim 1, further comprising:

after receiving the one or more data packets, receiving, at the network element, program code that implements a second adapter; and

in response to receiving the program code, storing the program code at the network element.

13. A method as recited in claim 1, wherein the first adapter converts the first application layer message into the second message by removing, from the first application layer message, information that is specific to the first application layer protocol.

14. A method as recited in claim 1, wherein the first application layer message conforms to Hypertext Transfer Protocol (HTTP), and wherein the second message does not conform to HTTP.

15. A method as recited in claim 1, wherein the first application layer message conforms to IBM MQ protocol, and wherein the second message does not conform to IBM MQ protocol.

16. A method as recited in claim 1, wherein the first application layer message conforms to TIBCO EMS protocol, and wherein the second message does not conform to TIBCO EMS protocol.

17. A method as recited in claim 1, wherein the first application layer message conforms to File Transfer Protocol (FTP), and wherein the second message does not conform to FTP.

18. A method as recited in claim 1, wherein the first application layer message conforms to Simple Mail Transfer Protocol (SMTP), and wherein the second message does not conform to SMTP.

19. A method as recited in claim 1, wherein the network element is a switch or router.

20. A method of transparently performing message payload processing functions in a network element on behalf of an application, the method comprising the computer-implemented steps of:

intercepting, at the network element, one or more data packets that are destined for a device other than the network element;

determining, based on information contained in the one or more data packets, a particular message classification;

determining one or more actions with which the particular message classification is associated;

performing the one or more actions at the network element; and

sending, from the network element, one or more data packets that contain a modified message;

wherein at least one of the one or more actions comprises modifying a portion of an application layer message contained in one or more payload portions of the one or more data packets to produce the modified message.

21. A computer-readable medium carrying one or more sequences of instructions for performing transformation adapter functions in a network element, which instructions, when executed by one or more processors, cause the one or more processors to carry out the steps of:

determining, at the network element, a first application layer message that is contained in one or more payload portions of one or more data packets, wherein the first application layer message conforms to a first application layer protocol;

determining the first application layer protocol;

selecting, based on the first application layer protocol, a first adapter from among a plurality of adapters that are accessible to the network element; and

providing the first application layer message as input to the first adapter, wherein the first adapter converts the first application layer message into a second message that does not conform to the first application layer protocol.

22. An apparatus for performing transformation adapter functions in a network element, comprising:

means for determining, at the network element, a first application layer message that is contained in one or more payload portions of one or more data packets, wherein the first application layer message conforms to a first application layer protocol;

means for determining the first application layer protocol;

means for selecting, based on the first application layer protocol, a first adapter from among a plurality of adapters that are accessible to the network element; and

means for providing the first application layer message as input to the first adapter, wherein the first adapter converts the first application layer message into a second message that does not conform to the first application layer protocol.

23. An apparatus for performing transformation adapter functions in a network element, comprising:

a network interface that is coupled to a data network for receiving one or more packet flows therefrom;

a processor;

one or more stored sequences of instructions which, when executed by the processor, cause the processor to carry out the steps of;

determining, at the network element, a first application layer message that is contained in one or more payload portions of one or more data packets, wherein the first application layer message conforms to a first application layer protocol;

determining the first application layer protocol;

selecting, based on the first application layer protocol, a first adapter from among a plurality of adapters that are accessible to the network element; and

providing the first application layer message as input to the first adapter, wherein the first adapter converts the first application layer message into a second message that does not conform to the first application layer protocol.

24. A system comprising:

a client application that sends an application layer message using a first application layer protocol, wherein the message is contained in one or more data packets that are addressed to a server application;

a server application that receives the message using a second application layer protocol that differs from the first application layer protocol; and

a network element that intercepts the one or more data packets and modifies the message so that the message uses the second application layer protocol instead of the first application layer protocol.