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//
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// MYDNSService.h
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// MYNetwork
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//
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// Created by Jens Alfke on 4/23/09.
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// Copyright 2009 Jens Alfke. All rights reserved.
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//
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#import <Foundation/Foundation.h>
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#import <CoreFoundation/CFSocket.h>
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@class MYDNSConnection;
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/** Abstract superclass for services based on DNSServiceRefs, such as MYPortMapper. */
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@interface MYDNSService : NSObject
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{
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@private
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BOOL _usePrivateConnection;
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MYDNSConnection *_connection;
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struct _DNSServiceRef_t *_serviceRef;
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CFSocketRef _socket;
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CFRunLoopSourceRef _socketSource;
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SInt32 _error;
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BOOL _continuous, _gotResponse;
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}
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/** If NO (the default), the service will stop after it gets a result.
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If YES, it will continue to run until stopped. */
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@property BOOL continuous;
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/** Starts the service.
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Returns immediately; you can find out when the service actually starts (or fails to)
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by observing the isOpen and error properties.
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It's very unlikely that this call itself will fail (return NO). If it does, it
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probably means that the mDNSResponder process isn't working. */
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- (BOOL) start;
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/** Stops the service. */
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- (void) stop;
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/** The error status, a DNSServiceErrorType enum; nonzero if something went wrong.
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This property is KV observable. */
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@property int32_t error;
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/** Utility to construct a service's full name. */
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+ (NSString*) fullNameOfService: (NSString*)serviceName
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ofType: (NSString*)type
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inDomain: (NSString*)domain;
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// PROTECTED:
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@property BOOL usePrivateConnection;
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/** Subclass must implement this abstract method to create a new DNSServiceRef.
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This method is called by -open.
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The implementation MUST pass the given sdRefPtr directly to the DNSService function
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that creates the new ref, without setting it to NULL first.
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It MUST also set the kDNSServiceFlagsShareConnection flag. */
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- (int32_t/*DNSServiceErrorType*/) createServiceRef: (struct _DNSServiceRef_t**)sdRefPtr;
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/** Subclass's callback must call this method after doing its own work.
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This method will update the error state, and will stop the service if it's not set to be
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continuous. */
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- (void) gotResponse: (int32_t/*DNSServiceErrorType*/)errorCode;
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@property (readonly) struct _DNSServiceRef_t* serviceRef;
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/** Same as -stop, but does not clear the error property.
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(The stop method actually calls this first.) */
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- (void) cancel;
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/** Block until a message is received from the daemon.
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This will cause the service's callback (defined by the subclass) to be invoked.
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@return YES if a message is received, NO on error (or if the service isn't started) */
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- (BOOL) waitForReply;
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@end
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@interface MYDNSConnection : NSObject
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{
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struct _DNSServiceRef_t* _connectionRef;
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CFSocketRef _socket;
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CFRunLoopSourceRef _runLoopSource;
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}
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+ (MYDNSConnection*) sharedConnection;
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- (id) initWithServiceRef: (struct _DNSServiceRef_t *)serviceRef;
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@property (readonly) struct _DNSServiceRef_t* connectionRef;
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- (BOOL) processResult;
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- (void) close;
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@end
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