Systems Interconnection (OSI) model of network communication. RPC spans the Transport layer and the Application layer in the Open The Institute of Electrical and ElectronicsĮngineers defines RPC in its ISO Remote Procedure Call Specification, Implementation is the Open Software Foundation's Distributed ComputingĮnvironment (DCE). There are several RPC models and implementations. Includes a runtime program and stub that interface with the remote Network that requests the remote procedure. TheĬlient runtime program has the knowledge of how to address the remoteĬomputer and server application and sends the message across the When the program is runĪnd the procedure call is issued, the stub receives the request andįorwards it to a client runtime program in the local computer. Representative of the remote procedure code. Program, a stub is included in the compiled code that acts as the When program statements that use RPC are compiled into an executable Threads that share the same address space allows multiple RPCs to be However, the use of lightweight processes or Requesting program to be suspended until the results of the remote Local procedure call, an RPC is a synchronous operation requiring the The requesting program is a clientĪnd the service-providing program is the server. (A procedureĬall is also sometimes known as a function call or a subroutine call.) Network without having to understand network details. Request a service from a program located in another computer in a Remote Procedure Call (RPC) is a protocol that one program can use to People prefer to choose a HTTPS server to invoke a remote component, it's more straightforward and controllable. In fact, HOST-to-HOST RPC is not widely spread, mainly because they are complicated and opaque, not friendly to the Internet due to the 445 or 135 ports often being blocked, and the authentication experience is bad. You must know Android, its Binder is very similar to DCOM's design. Why is RPC important? Just because every mature system need a cross-process communication mechanism, a toolset to generate stub/proxy, a standard to pack/unpack object. : Task Scheduler Service Remoting Protocol You can use rpcdump or ifids tool to dump all RPC internfaces on remote machine, see following results, you can see many system management interfaces(They can also be used locally of course): : Remote Shutdown Protocol Remote Management stuff such as when "Computer Management", "Registry Editor", you can let it connect to a remote machine! What happens underline is the RPC over SMB protocol(TCP port 445, known as File Sharing). can be automated because they are DCOM component:Įven Explorer's File Property dialog are also DCOM component, funny? If you remove all ACLs from "Edit Limits" of Launch Permissions of DCOMCNFG, you will can not do almost anything not only management works!, even show file property in explorer! You can run dcomcnfg to see how many DCOM components on your machine:Įxcel, Internet Explorer, Visual Studio. Many DCOM components(based on RPC, like a C++ wrapper of C), include COM+ components. You can see some of them in the list in "HOST-to-HOST" section. Raw RPC component, such as Registry, Netlogon, Firewall, Service Control, SQL Server. The truth is: RPC is widely used in LOCAL machine, but for HOST-to-HOST usage, is mainly used by Microsoft internally, seldom used by third-party. So this is a network-agnostic way for Windows components to be able to talk to other components on the local machine or remote machine. Why not use TCP/IP directly? At the time Windows NT was engineered (initial version released in 1993), you had other network protocols besides TCP/IP in common use, such as Netware (SPX/IPX), NetBIOS, AppleTalk (I think Windows supported this back in the day, could be wrong. Think of RPC as something one level above TCP/IP that's used as a low-level (and insecure) networkable communications framework by many Windows components. I believe even when you are accessing an MMC console, like compmgmt.msc to view things about the local machine, it's basically RPC'ing to localhost (I could be wrong though). This includes things like Active Directory, most MMC consoles, the functionality of some control panel applets like Device Manager, many of the things in Administrative Tools, and possibly internal Windows components. The designers of Windows decided to make many things talk to each other over RPC - so that they can talk either locally or over a network.
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