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15 Pages

RPC

Course: NAD 0603, Fall 2009
School: CSU Fullerton
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Word Count: 748

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RPCandNFS RaymondChan 1 NAD710 AdvancedTCP/IPNetworkAdministration SenecaCollegeofAppliedTechnology 2 WhatisRPC? RPCisaprogrammingparadigm(orprotocol) BasedonworkatXeroxPARCintheearly1980s RPCuseXDRencoding UsedbyNFS,portmapper,NIS,etc. RPCprotocolisnowapublicspecification 3 ComponentsofRPC ClientSTUBfunctiononthelocalhost providedbytheclientRPCpackage ServerSTUBfunctionontheremotehost...

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RPCandNFS RaymondChan 1 NAD710 AdvancedTCP/IPNetworkAdministration SenecaCollegeofAppliedTechnology 2 WhatisRPC? RPCisaprogrammingparadigm(orprotocol) BasedonworkatXeroxPARCintheearly1980s RPCuseXDRencoding UsedbyNFS,portmapper,NIS,etc. RPCprotocolisnowapublicspecification 3 ComponentsofRPC ClientSTUBfunctiononthelocalhost providedbytheclientRPCpackage ServerSTUBfunctionontheremotehost providedbytheserverRPCpackage ClientRPCpackageprovidestheactualprogramcodesto sendrequeststotheremotehostandreceiveresponsesfrom theremotehost. 4 RPCCallModel Client routine (1) (10) ClientStub (2) Network Routine (9) (8) (3) (6) ServerStub (7) Network Routine (4) Server routine (5) 5 ClientStub Calledbythelocalclientapplication Packagestheremoteprocedureargumentsintoa networkmessage Sendsthenetworkmessagetotheserverand waitsforresponsemessagesfromtheserver Takesthereturnvaluesfromthenetwork messagefromtheserverandreturnstotheclient application 6 ServerStub Waitsforincomingnetworkmessagefrom remoteclient Takesthevaluesoftheprocedurearguments fromthenetworkmessage,passesitontothe serverapplication,andwaitsforreturnvalues fromtheserverapplication Packagesthereturnvaluesintoanetwork messageandsendsitbacktotheremoteclient 7 DatainTransit Problemswhenbinarydataisexchangedbetween theclientandserver Differentbyteorders:bigendianvslitterendian Differentdatatyperepresentations:EBCDICvs ASCII Structurealignment XDRExternaldatarepresentation XDRisusedasthedata'sformatduringtransmissionbetween clientandserver. 8 XDR Astandardforencodingbinarydataina common,interoperableformat UsedbyRPCbasedprotocolslikeNFS,NISto encodedatainnetworkcallsandreplymessages ProvidesasimilarfunctiontothatoftheISO AbstractSyntaxNotation(ASN.1) XDRusesbigendianrepresentation(sameasthe Internetbyteorder) 9 Portmapper ProvidesmappingservicebetweentheRPC programnumberandtheportnumberusedbythe RPCapplication PortmapperusesUPDandTCPport111 WhenaRPCbasedserviceislaunchedonthe server,itregistersitsportusagetothe portmapper 10 RPCPortmapper RPCClientHost Similartotheuseofthe/etc/servicesfile 2GetPortNo ofRPCServer RPCServerHost Portmap (port111) 3PortNo. RPC Client Program 4Call/Reply 1Registerwith prog.No,version no,procedureno. andprotocolused RPC Server Program 11 NFSRPCcalls Call NULL Description TestswhethertheNFSserverisresponding.Itdoes notperformanyactualtask. GETATTR Getstheattributesofafilefoundontheserver. Theseattributesincludeprotection,owner,sizeand accesstimes. SETATTR Changestheattributesofafile. LOOKUP Performsadirectorylookupfortheclient.Returns bothafilehandleandtheattributesofthefile. ACCESS Checkstheaccesspermissionsfortheusers. 12 NFSRPC(2) Call READLINK READ WRITE CREATE MKDIR SYMLINK MKNOD REMOVE RMDIR Description Readsthevaluestoredwithinasymboliclink. Usedbytheclienttoreaddatafromafile. Usedbytheclienttowritedatatoafile. Createsafileinadirectory. Createsadirectory. Createsasymboliclinktoanexistingfile. Createsdevicefilesornamedpipes. Deletesafile. Removesanemptydirectory. 13 NFSRPC(3) Call RENAME LINK READDIR READDIRPLUS ... Description Renamesafileoradirectory. Createsahardlinktoanexistingfile. Viewsthecontentsofadirectory. Getsthecontentsofadirectoryincluding filename,fileID,attributes...

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