Listing 2-15Finding the active TCP/IP entity | Apple Network Setup

C H A P T E R 2

Using Network Setup

*activeEntity = (**entitiesInSet).fElements[entityIndex].fEntityRef; OTCfgChangeEntityArea(activeEntity, area);

}
if (entitiesInSet != nil) {
DisposeHandle( (Handle) entitiesInSet );	assert(MemError() ==
noErr);
}
return err;
}

The code in Listing 2-15 pulls together the process of ﬁnding an active set entity by ﬁnding the active TCP/IP set entity. It opens the database, calls MyFindFirstActiveEntity (Listing 2-14) with kOTCfgClassNetworkConnection and kOTCfgTypeTCPv4 as parameters, calls MyGetEntityUserVisibleName (Listing 2-9) to get and print the entity’s user visible name, and calls MyCloseDatabaseAfterReading (Listing 2-3) to close the database.

Listing 2-15Finding the active TCP/IP entity

static void PrintActiveTCPEntity(void)

{

OSStatus err;

CfgDatabaseRef dbRef;

CfgAreaID readArea;

CfgEntityRef activeTCPEntity;

Str255 userVisibleName;

err = MyOpenDatabaseForReading(&dbRef, &readArea); if (err == noErr) {

err = MyFindFirstActiveEntity(dbRef, readArea, kOTCfgClassNetworkConnection, kOTCfgTypeTCPv4, &activeTCPEntity);

if (err == noErr) {

err = MyGetEntityUserVisibleName(dbRef, &activeTCPEntity, userVisibleName);

}

if (err == noErr) {

Working with Sets

47

Image 47

Apple Network Setup manual Listing 2-15Finding the active TCP/IP entity

Contents

Network Setup Page Contents Network Setup Reference 111 Network Setup Protocol Structures and Data TypesGlossary Index Page Figures, Tables, and Listings Page Conventions Used in This Manual About This Manual For More Information Network Setup Architecture About Network Setup 1Network configuration prior to Network Setup 2Network Setup in Mac OS 8.5 through the present 3Future Network Setup architecture Inside the Network Setup Library 4Structure of the Network Setup Library Database Structure Network Setup Database Fundamentals Database Structure Example 5Sample organization of the default area Database Operations Shows this process diagrammatically Preference Coherency Legacy Issues Legacy Synchronization Algorithm Mac OS Network Setup Version HistoryMac OS Not released About Network Setup Network Setup Version History Opening the Database for Reading Opening and Closing the Network Setup Database Opening the Database for Writing Using Network Setup Closing the Database After Writing Closing the Database After Reading Listing 2-4Closing the database after writing Listing All Entities Working with Entities KCfgClassAnyEntity and kCfgTypeAnyEntity, respectively NoErr HLock Handle entityRefs Listing 2-6Printing the user-visible name for an entity Finding an Active Entity Reading and Writing Preferences Listing 2-7Reading a ﬁxed-size preference Reading Fixed-size Preferences OSStatus err AssertdbRef = nil Assertentity Listing 2-9Reading the user-visible name preference Reading Variable-size Preferences == noErr HLockbuffer Listing 2-11Writing a preference Writing Preferences Iterating the Preferences in an Entity Listing 2-12Printing an entity’s table of contents If err != noErr PrintfFailed with error %ld.\n, err Working with Sets Finding the Active Set Entity Listing 2-13Finding the active set entity NoErr Return err Working with Sets Listing 2-15Finding the active TCP/IP entity Areas and Sets TCP/IP Notes Protocol-speciﬁc Topics Start the cursor at the beginning of the packed preference PrefDataErr return paramErr AssertpackedPref != nil assertunpackedPref != nil Remote Access Notes Modem Notes Listing 2-17Encrypting the user’s password Using Network Setup Using Network Setup Opening and Closing the Network Setup Database Network Setup Functions OTCfgCloseDatabase OTCfgOpenDatabase Managing Areas Represents a database session previously opened by calling Obtains the default areaOTCfgGetCurrentArea On input, a value of type CfgDatabaseRef page 98 that OTCfgOpenArea OTCfgSetCurrentArea On input, a value of type CfgAreaID page 98 that identiﬁes Closes an area in the Network Setup databaseOTCfgCloseArea OTCfgBeginAreaModiﬁcations OTCfgCommitAreaModiﬁcations OTCfgIsSameAreaID OTCfgAbortAreaModiﬁcations OTCfgGetAreaName OTCfgSetAreaName OTCfgGetAreasList OTCfgGetAreasCount On input, an array of elements of type Str255 that is large Be less that expected if areas were deleted between callingIs large enough to hold the number of area IDs speciﬁed by You don’t want to get area IDs, set areaID to Null Value of noErr indicates that OTCfgCreateArea returned Creates an area in the Network Setup databaseOTCfgCreateArea Output, areaID contains the ID of the area that was created Value of noErr indicates that OTCfgDuplicateArea returned Copies the contents of one area to another areaOTCfgDuplicateArea By areaID does not exist, OTCfgDuplicateArea returns OTCfgDeleteArea Deletes an area in the Network Setup databaseManaging Entities KCfgTypeAnyEntity. For a list of possible types, see Entity Not exist, OTCfgGetEntitiesCount returns the errorOTCfgGetEntitiesCount Classes and Types Obtains information about entities in an area OTCfgGetEntitiesList Network Setup Reference Creates an entity in an area OTCfgIsSameEntityRefOTCfgCreateEntity Compares two entity references On input, a pointer to a value of type CfgEntityRef AreaID is not writable, OTCfgCreateEntity returns the errorAlready exists, OTCfgCreateEntity returns the error Speciﬁes the class, type, user-visible name, and icon for OTCfgDuplicateEntity OTCfgDeleteEntity User-visible name of the entity represented by entityRef OTCfgGetEntityLogicalNameObtains the user-visible name of an entity Reference for an entity, call OTCfgGetEntitiesList Obtains the name of an entity OTCfgGetEntityName OTCfgSetEntityName OTCfgChangeEntityArea OTCfgGetEntityArea Managing Preferences OTCfgOpenPrefs OTCfgGetPrefsSize OTCfgClosePrefs OTCfgGetPrefs OTCfgSetPrefs Gets the number of preferences in an entity OTCfgGetPrefsTOCCount Gets a list of the preferences in an entity OTCfgGetPrefsTOC Deletes a preference OTCfgGetDefaultOTCfgDeletePrefs OTCfgGetTemplate Gets the default value for a speciﬁc preference Value of noErr indicates that OTCfgGetTemplate returned Returns as much data as possible and returns the errorValue but not the default value itself, set data to Null Preference Utilities OTCfgDecrypt OTCfgEncrypt OTCfgInstallNotiﬁer Installing and Removing a Notiﬁcation Callback Values, see the constants described in Entity Classes Notiﬁcation callback that is to be installedNotiﬁcation callback when it is called Value of noErr indicates that OTCfgInstallNotifier returned Removes a notiﬁcation callback Was speciﬁed when the notiﬁcation callback was installedApplication-Deﬁned Routines OTCfgRemoveNotiﬁer Notiﬁcation Callback Routine Network Setup Structures and Data Types An unsigned 32-bit value that uniquely identiﬁes an area CfgDatabaseRefCfgAreaID Value of type CfgAreaID identiﬁes an area Area in which the entity resides CfgEntityRefCfgEntityInfo CfgEntityRef structure refers to a speciﬁc entity CfgPrefsHeader CfgEntityAccessID 101 CfgResourceLocatorCfgSetsStruct Follows For the fFlags ﬁeld that followsAn array of time stamps used during legacy import Export indexed by the enumeration for the fTimes ﬁeld that 103 CfgSetsElementCfgSetsVector Entity Classes and Types Network Setup Constants 105 Class code for network connection entities Following enumeration deﬁnes per-connection preference types Common Preference Types 107 This preference is not documentedDummy preference type used for free blocks in an entity Following enumeration deﬁnes global preference types Set Entity Preference Types Constant kInvalidCfgAreaID represents an invalid area ID Basic user modeAdvanced user mode Invalid Area ID Result Codes 111 Protocol StructuresTCP/IP Structures OTCfgTCPInterfacesUnpacked 113 Containing port, module, and framing information OTCfgTCPInterfacesPackedOTCfgTCPInterfacesPackedPart 115 OTCfgTCPDHCPLeaseInfo An unbounded array containing the IP addresses of name OTCfgTCPDNSServersListOTCfgTCPLocks Number of IP addresses in the list 117 ﬁeld Set to True to lock the Router address text ﬁeldSet to True to lock the Ending domain name text ﬁeld Set to True to lock the Additional search domains text 119 OTCfgTCPRoutersListOTCfgTCPRoutersListEntry Number of domains in the list OTCfgTCPSearchDomainsOTCfgTCPSearchList 121 OTCfgTCPUnloadAttr Apple Remote Access Structures 123 OTCfgRemoteAlternateAddressOTCfgRemoteApplication Must be zero OTCfgRemoteARAP 125 OTCfgRemoteClientLocks Control panel is locked when the headerCompress ﬁeld is set Allow error correction and compression in modemErrorCheck ﬁeld is set to 1 and unlocked when ErrorCheck ﬁeld is set to zero 127 OTCfgRemoteClientMiscOTCfgRemoteConnect Is to log on as Guest Set to 1 to use the password preferenceKOTCfgRemotePasswordPref or set to zero to prompt User for a password 129 OTCfgRemoteDialAssist 131 OTCfgRemoteDialing Milliseconds. Must be OTCfgRemoteIPCP 133 OTCfgRemoteLCP Port. Must be ‘Script’ 135 OTCfgRemotePasswordOTCfgRemoteLogOptions OTCfgRemoteServer 137 OTCfgRemoteServerPort OTCfgRemoteTerminal 139 OTCfgRemoteUserMode OTCfgRemoteX25 structure stores X.25 connection information Administration password. The format is notOTCfgRemoteX25 Documented 141 Modem StructuresOTCfgModemGeneral Must be zero for standard dial-up connections OTCfgModemApplication 143 OTCfgModemLocks AppleTalk Structures Set dialing to zero to unlock the setting 145 OTCfgATalkGeneral OTCfgATalkGeneralAARP 147 OTCfgATalkGeneralADSP Extended Tsdu Etsdu size. The default is FDefaultSendBlockingBytes, default isTransport Service Data Unit TSDU, which is Carry. The default is 149 OTCfgATalkGeneralASPSize in bytes of this structure Maximum amount of data that packets of this protocol Can carry. The default isOTCfgATalkGeneralATP 151 OTCfgATalkGeneralDDP Possible values Can carry. Must be 586, which is the basic AppleTalkDatagram size Whether AppleTalk is active. See discussion below for 153 OTCfgATalkGeneralNBP OTCfgATalkGeneralPAP 155 Default open interval in milliseconds. The default value isOTCfgATalkGeneralZIP OTCfgATalkLocks 157 OTCfgATalkNetworkArchitecture Open Transport device type such as Infrared StructuresOTCfgATalkPortDeviceType Must be OTOn 159 Protocol Constants and Other Data TypesOTCfgIRGeneral Reference to the infrared port KOTCfgTCPSearchListPref TCP/IP Constants and Other Data Types 161 Masks for the kOTCfgProtocolOptionsPref Preference If set, this bit turns off path MTU discovery If set, this bit disables Dhcp INIT-REBOOT capabilityOTCfgTCPConﬁgMethod 163 Apple Remote Access Constants and Other Data TypesARA Per-Connection Preferences Types Preference type for the OTCfgRemoteARAP page 124 structure 165 Preference type for the OTCfgRemoteIPCP page 132 structurePreference type for the OTCfgRemoteLCP page 133 structure Preference type for the OTCfgRemoteX25 page 140 structure Deﬁned but not used by ARA ARA Global Preference TypesOTCfgRemotePPPConnectScript 167 OTCfgRemoteProtocol OTCfgRemoteDialMode OTCfgRemoteLogLevel 169 OTCfgRemoteAnswerModeOTCfgRemoteNetworkProtocol Modem Constants and Other Data Types OTCfgRemoteNetAccessMode 171 Modem Global Preference TypesOTCfgModemDialingToneMode Preference type for the OTCfgModemLocks page 143 structure KModemDialToneIgnoreDo not wait for dial tone AppleTalk Constants and Other Data TypesPer-connection AppleTalk Preference Types 173 Infrared Constants and Other Data TypesGlobal AppleTalk Preference Types Speciﬁes the Infrared Data Association IrDA protocol OTCfgIRPortSettingOTCfgIRPortSetting enumeration deﬁnes constants for use 175 Aarp See AppleTalk Address Resolution Protocol IP See Internet Protocol Icmp See Internet Control Message Protocol 177 Media access control address The six-byte O S S a R Y 179 Index History, version 180 Structure 181 182 183 184