Reducing WWW latency and bandwidth requirements by real-time distillation
Proceedings of the fifth international World Wide Web conference on Computer networks and ISDN systems
Flavor: a language for media representation
MULTIMEDIA '97 Proceedings of the fifth ACM international conference on Multimedia
An active service framework and its application to real-time multimedia transcoding
Proceedings of the ACM SIGCOMM '98 conference on Applications, technologies, architectures, and protocols for computer communication
PLAN: a packet language for active networks
ICFP '98 Proceedings of the third ACM SIGPLAN international conference on Functional programming
Application level active networking
Computer Networks: The International Journal of Computer and Telecommunications Networking - Special issue on high-performance protocol architectures
Multimedia Web services for mobile clients using quality aware transcoding
WOWMOM '99 Proceedings of the 2nd ACM international workshop on Wireless mobile multimedia
Router plugins: a software architecture for next-generation routers
IEEE/ACM Transactions on Networking (TON)
Flexible, Dynamic, and Scalable Service Composition for Active Routers
IWAN '02 Proceedings of the IFIP-TC6 4th International Working Conference on Active Networks
PromethOS: A Dynamically Extensible Router Architecture Supporting Explicit Routing
IWAN '02 Proceedings of the IFIP-TC6 4th International Working Conference on Active Networks
Providing dynamic and customizable caching policies
USITS'99 Proceedings of the 2nd conference on USENIX Symposium on Internet Technologies and Systems - Volume 2
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In this paper, we present GateScript, a scripting language for active applications to be executed on generic active gateways. Unlike other active networking platforms, it offers a simple scripting language for expressing custom processing of packets at different protocol layers without the need for interpretation of complex protocol data structures. In this way, the user writes statements in a script-like language while using protocol-specific variables and predefined function calls acting on the packet's content. From a textual description, we automatically create a packet parser and reassembler for a given protocol. The parser decomposes PDUs arriving in an active application into protocol variables that can be used in the script language. After processing, outcoming packets are reconstructed from the protocol variables. GateScript also enables active applications to react to the state of the environment: they can receive events from monitors and test variables reflecting the state of the environment. We have designed an architecture for a generic active gateway (GAG) that supports GateScript. An active application can dynamically install/ remove a packet filter that intercepts relevant packets and passes them to the application. We have implemented GAG on Linux: its packet forwarding part is implemented in the kernel and all other components as user space processes.