公开(公告)号：EP1011244A3

公开(公告)日：2002-06-05

申请号：EP99309826.8

申请日：1999-12-07

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Cohen, Ariel ,  Rangarajan, Sampath ,  Singh, Navjot

IPC: H04L29/06 ,  G06F17/30 ,  H04L29/12

CPC classification number: H04L67/2804 ,  H04L29/06 ,  H04L29/12009 ,  H04L61/00 ,  H04L67/1002 ,  H04L67/1017 ,  H04L67/1019 ,  H04L67/1027 ,  H04L67/2814 ,  H04L69/16 ,  H04L69/161 ,  H04L69/165 ,  H04L69/166

Abstract: In order to transparently redirect an HTTP connection request that is directed to an origin server (107) to a proxy cache (110-1), a proxy redirector (104) translates the destination address of packets directed to the origin server to the address of the proxy. During a handshaking procedure, a TCP connection is transparently established between the client (110-1) and the proxy cache. When the client transmits a GET request to what it thinks is the origin server, which request specifies the complete address of an object at that origin server that it wants a copy of, the proxy redirector modifies the complete address specified in that GET request before it is sent to the proxy cache. Specifically, the IP address of the origin server found in the destination field in the IP header of the one or more packets from the client containing the GET request is added by the proxy redirector as a prefix to the complete URL in the GET request to form an absolute URL. The proxy cache determines from that absolute URL whether it has the requested object stored in its cache. If it does, it sends the object back to the proxy redirector, which masquerades those packets as coming from the origin server by translating their destination address to the address of the client and their source address to that of the origin server. If the proxy does not have the requested object, a separate TCP connection is established between the proxy and the origin server from where the object is retrieved and then forwarded over the TCP connection between the client and the proxy. In order to account for the additional number of bytes in the GET request, an acknowledgement sequence number in packets returned from the proxy that logically follow receipt of the GET request are decremented by that number by the proxy redirector before being forwarded to the client. Similarly, a sequence number in packets transmitted by the client subsequent to the GET request are incremented by that number before being forwarded by the proxy redirector to the proxy cache.

公开(公告)号：EP1011244A2

公开(公告)日：2000-06-21

申请号：EP99309826.8

申请日：1999-12-07

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Cohen, Ariel ,  Rangarajan, Sampath ,  Singh, Navjot

IPC: H04L29/06 ,  G06F17/30

CPC classification number: H04L67/2804 ,  H04L29/06 ,  H04L29/12009 ,  H04L61/00 ,  H04L67/1002 ,  H04L67/1017 ,  H04L67/1019 ,  H04L67/1027 ,  H04L67/2814 ,  H04L69/16 ,  H04L69/161 ,  H04L69/165 ,  H04L69/166

Abstract: In order to transparently redirect an HTTP connection request that is directed to an origin server (107) to a proxy cache (110-1), a proxy redirector (104) translates the destination address of packets directed to the origin server to the address of the proxy. During a handshaking procedure, a TCP connection is transparently established between the client (110-1) and the proxy cache. When the client transmits a GET request to what it thinks is the origin server, which request specifies the complete address of an object at that origin server that it wants a copy of, the proxy redirector modifies the complete address specified in that GET request before it is sent to the proxy cache. Specifically, the IP address of the origin server found in the destination field in the IP header of the one or more packets from the client containing the GET request is added by the proxy redirector as a prefix to the complete URL in the GET request to form an absolute URL. The proxy cache determines from that absolute URL whether it has the requested object stored in its cache. If it does, it sends the object back to the proxy redirector, which masquerades those packets as coming from the origin server by translating their destination address to the address of the client and their source address to that of the origin server. If the proxy does not have the requested object, a separate TCP connection is established between the proxy and the origin server from where the object is retrieved and then forwarded over the TCP connection between the client and the proxy. In order to account for the additional number of bytes in the GET request, an acknowledgement sequence number in packets returned from the proxy that logically follow receipt of the GET request are decremented by that number by the proxy redirector before being forwarded to the client. Similarly, a sequence number in packets transmitted by the client subsequent to the GET request are incremented by that number before being forwarded by the proxy redirector to the proxy cache.

Abstract translation: 为了透明地重定向HTTP连接请求的没有被引导到在源服务器（107）到代理高速缓存（110-1），代理重定向器（104）反式酸酯定向到原始服务器的分组的目的地地址的地址 代理。 在握手过程中，TCP连接被透明客户端（110-1）和所述代理缓存之间建立。 当客户端发送一个GET请求，它认为什么是原始服务器，其中请求规定对象的完整地址没有原始服务器做了它之前，它希望的副本，代理重定向修改中指定的完整地址没有得到请求 被发送到代理缓存。 具体地，在目的地字段中发现在从客户端包含GET请求的一个或多个分组的IP报头中的源服务器的IP地址是由代理重定向作为前缀添加到在GET请求中的完整的URL，以形成 绝对URL。 从代理缓存确定性的地雷没有绝对的URL是否已经被请求的对象存储在它的高速缓存。 如果是这样，它发送的对象返回给代理重定向器，它通过翻译他们的目的地地址给客户端的地址和源地址和源服务器所做的伪装那些包从源服务器的到来。 如果代理没有请求的对象，一个单独的TCP连接代理，并从该对象检索，然后转发在客户端与代理之间的TCP连接的源服务器之间建立的。 为了在从所述代理返回并在逻辑上遵循收据GET请求的数据包，以考虑字节在GET请求中的附加数量，在确认序号由数字被转发给客户机之前递减并通过所述代理重定向器。 类似地，在由客户端继GET请求发送的分组的序列号被数字确实由代理重定向器转发到代理缓存之前递增。

公开(公告)号：EP0965921A2

公开(公告)日：1999-12-22

申请号：EP99304420.5

申请日：1999-06-08

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Klemm, Reinhard ,  Singh, Navjot ,  Tsai, Timothy

IPC: G06F11/00

CPC classification number: G06F11/3664 ,  G06F11/3644

Abstract: The invention provides a software instrumentation tool operative to control the execution of a target program, and to execute user-specified instrumentation actions upon occurrence of corresponding user-specified events during target program execution. Advantageously, the instrumentation tool permits the instrumentation actions to be implemented without modification of the target program code, and can be used to provide any desired type of instrumentation on any target program. In an illustrative embodiment, the instrumentation tool includes a frontend portion which provides a creation graphical user interface (GUI) to the tool, and a backend portion which controls execution of the target program and executes the user-specified actions. The frontend portion also includes, for a given target program, a created GUI which is created by a user for providing selected instrumentation functions for the given target program. The frontend and backend portions of the instrumentation tool may each be running on a different machine, or both may run on the same machine. The invention may be used in a wide variety of applications, including application program modification and management, fault tolerance, real-time collaboration, process monitoring, software rejuvenation and graphical interface generation.

Abstract translation: 本发明提供一种软件仪表工具，其可操作以控制目标程序的执行，并且在目标程序执行期间发生相应的用户指定事件时执行用户指定的仪器操作。 有利地，仪器工具允许在不修改目标程序代码的情况下实现仪表操作，并且可以用于在任何目标程序上提供任何期望类型的仪器。 在说明性实施例中，仪器工具包括向工具提供创建图形用户界面（GUI）的前端部分和控制目标程序执行并执行用户指定动作的后端部分。 对于给定的目标程序，前端部分还包括由用户创建的用于为给定的目标程序提供所选择的仪器功能的创建的GUI。 仪器工具的前端部分和后端部分都可以在不同的机器上运行，或者两者都可以在同一台机器上运行。 本发明可以用于各种应用，包括应用程序修改和管理，容错，实时协作，过程监控，软件复原和图形界面生成。

公开(公告)号：EP1011244B1

公开(公告)日：2004-09-08

申请号：EP99309826.8

申请日：1999-12-07

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Cohen, Ariel ,  Rangarajan, Sampath ,  Singh, Navjot

IPC: H04L29/06 ,  G06F17/30 ,  H04L29/12

CPC classification number: H04L67/2804 ,  H04L29/06 ,  H04L29/12009 ,  H04L61/00 ,  H04L67/1002 ,  H04L67/1017 ,  H04L67/1019 ,  H04L67/1027 ,  H04L67/2814 ,  H04L69/16 ,  H04L69/161 ,  H04L69/165 ,  H04L69/166

公开(公告)号：EP0965921A3

公开(公告)日：2002-03-06

申请号：EP99304420.5

申请日：1999-06-08

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： Klemm, Reinhard ,  Singh, Navjot ,  Tsai, Timothy

IPC: G06F11/00

CPC classification number: G06F11/3664 ,  G06F11/3644

Abstract: The invention provides a software instrumentation tool operative to control the execution of a target program, and to execute user-specified instrumentation actions upon occurrence of corresponding user-specified events during target program execution. Advantageously, the instrumentation tool permits the instrumentation actions to be implemented without modification of the target program code, and can be used to provide any desired type of instrumentation on any target program. In an illustrative embodiment, the instrumentation tool includes a frontend portion which provides a creation graphical user interface (GUI) to the tool, and a backend portion which controls execution of the target program and executes the user-specified actions. The frontend portion also includes, for a given target program, a created GUI which is created by a user for providing selected instrumentation functions for the given target program. The frontend and backend portions of the instrumentation tool may each be running on a different machine, or both may run on the same machine. The invention may be used in a wide variety of applications, including application program modification and management, fault tolerance, real-time collaboration, process monitoring, software rejuvenation and graphical interface generation.