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Apple Network Setup manual Legacy Issues, Preference Coherency

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Preference Coherency

C H A P T E R 1

About Network Setup

Preference Coherency

When an application commits changes to the default area, it is important that applications that are reading the database be informed of those changes. For example, an application might be displaying the DHCP client ID preference. If another application changes this preference in the database, it is important that the original application update its display.

Prior to Network Setup 1.0.2, the mechanism by which readers learned of changes was somewhat primitive. When a writing application committed its changes, Network Setup tagged each reading application’s database reference with an error. Any subsequent calls using that database connection failed with an error (kCfgErrDatabaseChanged). The reading application responded by closing its database reference and opening the database again. It then read the new preferences.

Network Setup 1.0.2 introduces a new, notiﬁer-based mechanism for learning about preference changes. The reading application attaches a notiﬁer to the database reference. When changes are committed to the database, Network Setup calls each installed notiﬁer to inform the reading application that a change has occurred. The reading application should respond by re-reading any preferences it has cached.

Legacy Issues

As described in the section “Network Setup Architecture” (page 11), current versions of Network Setup automatically synchronize the legacy preferences ﬁles with the database. This synchronization mechanism is transparent to applications calling Network Setup, but there are two issues that you should be aware of:

■Legacy synchronization is slow. Depending on the speed of the computer and the number of entities, a full synchronization can take seconds. You should do all that you can to avoid synchronizations. The best way to avoid synchronizations is to adopt Network Setup and avoid modifying the legacy preferences ﬁles directly.

■Legacy preferences ﬁles do not support multihoming.

Legacy Issues

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Apple Network Setup manual Legacy Issues, Preference Coherency

Contents

Network Setup I N S I D E M A C I N T O S H Apple Computer, Inc 2000 Apple Computer, Inc. All rights reserved About Network Setup ContentsUsing Network Setup About This ManualChapter Network Setup ReferenceGlossary Index Chapter 4 Network Setup Protocol Structures and Data TypesPage Using Network Setup About Network SetupFigures, Tables, and Listings ChapterPage Conventions Used in This Manual About This ManualInside AppleTalk, Second Edition For More InformationInside Macintosh Networking with Open Transport Open Transport Advanced Client Programming, available atNetwork Setup Architecture About Network SetupThe architecture shown in Figure 1-1 had a number of drawbacks The following key points are to be taken from Figure Inside the Network Setup Library Inside the Network Setup Library About Network Setup Figure 1-4 Structure of the Network Setup LibraryHigh-level framework Mid-level database OTCfgDatabase Structure Network Setup Database FundamentalsDatabase Structure Example Figure 1-5 Sample organization of the default area About Network Setup18 Network Setup Database Fundamentals LocalTalk for Printer AppleTalk networkork protocol entityDatabase Operations Figure 1-6 shows this process diagrammatically Preference Coherency Legacy IssuesLegacy Synchronization Algorithm Network Setup Version History VersionMac OS version About Network Setup 24 Network Setup Version HistoryC H A P T E R Using Network Setup Opening and Closing the Network Setup DatabaseOpening the Database for Reading Opening the Database for Writing Using Network Setup Listing 2-1 Opening the database for reading26 Opening and Closing the Network Setup Database Using Network Setup Opening and Closing the Network Setup DatabaseListing 2-2 Opening the database for writing Closing the Database After Writing Closing the Database After ReadingOpening and Closing the Network Setup Database Using Network SetupListing 2-4 Closing the database after writing err = OTCfgCommitAreaModificationsdbRef, readArea, writeAreaListing All Entities Working with Entitiesstatic OSStatus MyGetEntitiesListCfgDatabaseRef dbRef, CfgAreaID area kCfgClassAnyEntity and kCfgTypeAnyEntity, respectivelyOSType entityClass OSType entityType CfgEntityRef **entityRefs CfgEntityInfo **entityInfos32 Working with Entities Using Network SetupThe next routine, shown in Listing 2-6, opens the database for reading, gets the entity references for all of the TCP/IP network connection entities in the default area using the MyGetEntitiesList routine in Listing 2-5, and prints their user-visible names. This routine calls a routine, MyGetEntityUserVisibleName, which hasn’t been documented yet. It is shown in Listing 2-9 in the section “Reading and Writing Preferences” page Finding an Active Entity Reading and Writing PreferencesUsing Network Setup Reading Fixed-size PreferencesListing 2-7 Reading a ﬁxed-size preference Reading and Writing PreferencesThe sample shown in Listing 2-7, which opens and closes the entity before reading each preference, is implemented in an inefﬁcient manner for the sake of clarity. If you are reading multiple preferences, it is more efﬁcient to open the entity once. Then read the preferences by calling OTCfgGetPrefs or OTCfgSetPrefs multiple times and close the entity when you’re done assertdbRef != nil assertentity != nil assertname != nil Reading Variable-size Preferences38 Reading and Writing Preferences Using Network SetupWriting Preferences Iterating the Preferences in an Entity Reading and Writing Preferences Using Network SetupWorking with Sets Finding the Active Set Entity The MyFindActiveSet routine in Listing 2-13 implements the ﬁrst two steps. It starts by getting a list of all of the set entities by calling the MyGetEntitiesList routine Listing 2-5. Then MyFindActiveSet iterates through all of the set entities, reading the kOTCfgSetsStructPref preference of each set entity. That preference maps to the CfgSetsStruct structure, which contains an fFlags member. One bit of the fFlags member, kOTCfgSetsFlagActiveMask, indicates whether this set entity is the active set entity. If it is, the routine breaks out of the loop and returns the set’s entity reference to the caller breaks out of the loop and returns the found entity Using Network Setup Listing 2-14 Finding the active entity of a given class and type46 Working with Sets Using Network Setup Listing 2-15 Finding the active TCP/IP entityWorking with Sets Areas and Sets TCP/IP Notes Protocol-speciﬁc Topicsaccess the preference in its packed format Using Network Setup Protocol-speciﬁc Topicscursor = UInt8 * packedPref Using Network Setup 52 Protocol-speciﬁc TopicsUInt8 *cursor Remote Access Notes OTCfgRemoteClientLocks page Modem NotesNetwork Setup and Third-party Protocol Stacks Notes for Third PartiesStoring Third-party Preferences in Apple Entities Using Network Setup 56 Notes for Third PartiesC H A P T E R Network Setup Reference Network Setup FunctionsOpening and Closing the Network Setup Database OTCfgCloseDatabase OTCfgOpenDatabaseManaging Areas OTCfgGetCurrentArea OTCfgOpenArea OTCfgSetCurrentAreaOTCfgCloseArea function result OTCfgBeginAreaModiﬁcationsfunction result OTCfgCommitAreaModiﬁcationsOTCfgIsSameAreaID OTCfgAbortAreaModiﬁcationsfunction result OTCfgAbortAreaModifications returns kCfgErrAreaNotFoundfunction result OTCfgGetAreaNamefunction result OTCfgSetAreaNameOTCfgGetAreasCount OTCfgGetAreasListfunction result function result that are available. On output, itemCount points to the number offunction result OTCfgCreateAreafunction result OTCfgDuplicateAreaOTCfgDeleteArea Managing EntitiesOTCfgGetEntitiesCount OTCfgGetEntitiesList entityType On input, a value of type CfgEntityType that speciﬁes the type that is to be matched. To specify all types, set entityType to kCfgTypeAnyEntity. For a list of possible types, see “Entity Classes and Types” page OTCfgCreateEntity OTCfgIsSameEntityReffunction result On input, a value of type CfgDatabaseRef page 98 thatOTCfgDuplicateEntity OTCfgDeleteEntityfunction result const CfgEntityRef* entityRef, const CfgEntityRef* newEntityRefOTCfgGetEntityLogicalName function result None OTCfgGetEntityNamefunction result OTCfgSetEntityNameOTCfgGetEntityArea OTCfgChangeEntityAreafunction result function result None Managing Preferencesfunction result OTCfgOpenPrefsOTCfgGetPrefsSize OTCfgClosePrefsOTCfgGetPrefs function resultvoid* data, ByteCount length OTCfgSetPrefs function resultconst void* data, ByteCount length OTCfgGetPrefsTOCCount OTCfgGetPrefsTOC OTCfgDeletePrefs OTCfgGetDefaultOTCfgGetTemplate function result Preference UtilitiesOTCfgDecrypt OTCfgEncryptOTCfgInstallNotiﬁer Installing and Removing a Notiﬁcation Callbackfunction result On input, a value of type CfgDatabaseRef page 98 thatApplication-Deﬁned Routines OTCfgRemoveNotiﬁerfunction result Notiﬁcation Callback Routine Network Setup Structures and Data TypesCfgAreaID CfgDatabaseRefCfgEntityRef CfgEntityInfoField descriptions CfgPrefsHeader CfgEntityAccessIDCfgSetsStruct CfgResourceLocatorFlags for this set. For possible values, see the enumeration CfgSetsVector CfgSetsElementEntity Classes and Types Network Setup ConstantsWildcard Classes and Types Per-connection Preference Types Common Preference TypesGlobal Preference Types Set Entity Preference Types Backward Compatibility Preference TypesGlobal Backward Compatibility Preference Types OTCfgUserMode Preference Invalid Area IDResult Codes Network Setup Protocol Structures and Data Types Protocol StructuresTCP/IP Structures OTCfgTCPInterfacesUnpacked modulekMaxModuleNameSize OTCfgTCPInterfacesPacked OTCfgTCPInterfacesPackedPartpartsizeofOTCfgTCPInterfacesPackedPart OTCfgTCPDHCPLeaseInfo OTCfgTCPLocks OTCfgTCPDNSServersListlockAdminDomainName lockLocalDomainNamelockDNSServersList Set to TRUE to lock the “Router address” text ﬁeld OTCfgTCPRoutersList OTCfgTCPRoutersListEntryOTCfgTCPRoutersListEntry page 119 structures OTCfgTCPSearchList OTCfgTCPSearchDomainsOTCfgTCPUnloadAttr Apple Remote Access Structures OTCfgRemoteApplication OTCfgRemoteAlternateAddressOTCfgRemoteARAP OTCfgRemoteClientLocks useVerboseLogLockregUserOrGuestLock The “Allow error correction and compression in modem” OTCfgRemoteConnect OTCfgRemoteClientMiscconnectAutomatically canInteractissueConnectedReminders allowModemDataCompressionOTCfgRemotePPPConnectScript If Notification Manager reminders are enabled, the number isAssisted to 1 to use Dial Assist. When isAssisted is set to OTCfgRemoteDialAssistOTCfgRemoteDialing additionalPtrmade. Only valid if dialMode is not kOTCfgRemoteRedialNone OTCfgRemoteIPCP lowerLayerName36 OTCfgRemoteLCPkOTCfgRemoteAcceptedVersion. When reading the version OTCfgRemoteLogOptions OTCfgRemotePasswordOTCfgRemoteServer configCountconfigIDs1 struct OTCfgRemoteServerPort OTCfgRemoteServerPortOTCfgRemoteNetworkProtocol serialLayerNamekMaxProviderNameSizeAccess mode flags. For possible values, see the OTCfgRemoteTerminalNetwork Setup Protocol Structures and Data Types Must be TRUEOTCfgRemoteUserMode OTCfgRemoteX25 OTCfgModemGeneral Modem StructuresOTCfgModemApplication OTCfgModemLocks AppleTalk Structures OTCfgATalkGeneral OTCfgATalkGeneralAARP fMaxConsecutiveDataPackets OTCfgATalkGeneralADSPPage OTCfgATalkGeneralASP OTCfgATalkGeneralATP fDefaultRetryIntervalfDefaultReleaseTimer Network Setup Protocol Structures and Data Types OTCfgATalkGeneralDDPProtocol Structures fMyZonekZIPMaxZoneLength+1The maximum amount of data that packets of this protocol OTCfgATalkGeneralNBP fDefaultTickleInterval OTCfgATalkGeneralPAPfDefaultTickleRetries fDefaultPAPEOMEnabledOTCfgATalkGeneralZIP OTCfgATalkLocks Constant descriptions kOTCfgATalkPortLockMask OTCfgATalkNetworkArchitectureOTCfgATalkPortDeviceType Infrared StructuresOTCfgIRGeneral Protocol Constants and Other Data TypesNetwork Setup Protocol Structures and Data Types TCP/IP Constants and Other Data Types“AppleTalk Constants and Other Data Types” page “Infrared Constants and Other Data Types” pagekDontShutDownOnARPCollisionMask = Masks for the kOTCfgProtocolOptionsPref Preference0x0002 0x0004OTCfgTCPConﬁgMethod ARA Per-Connection Preferences Types Apple Remote Access Constants and Other Data TypesThe preference type for the OTCfgRemoteARAP page 124 structure Network Setup Protocol Structures and Data TypesThe preference type for the OTCfgRemoteDialing page 131 structure The preference type for the OTCfgRemoteClientLocks page 125 structureThe preference type for the OTCfgRemoteConnect page 127 structure OTCfgRemotePPPConnectScript ARA Global Preference TypesOTCfgRemoteProtocol OTCfgRemoteDialMode OTCfgRemoteLogLevelOTCfgRemoteNetworkProtocol OTCfgRemoteAnswerModeModem Constants and Other Data Types OTCfgRemoteNetAccessModeOTCfgModemDialingToneMode Modem Global Preference TypesPer-connection AppleTalk Preference Types AppleTalk Constants and Other Data TypesGlobal AppleTalk Preference Types Infrared Constants and Other Data TypesOTCfgIRPortSetting Glossary maximum transmission unit MTU The maximum number of bytes in a packet media access control address The six-byte Transmission Control Protocol/Internet Protocol A connection-oriented transport-layer Internet protocol that provides reliable full-duplex data transmission Index Page notiﬁcation routine installing 94 removing named areas network connection entities 16 Network Setuplegacy preference ﬁles mid-level database 15 modem constants 170 multihoming 12Page setting entity names 81 structures set entities 16 active, number of 43 usingTCP/IP constants 160 preferences temporary area 20 third-party developers 55 type, entityI N D E