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//
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// TCPConnection.h
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// MYNetwork
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//
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// Created by Jens Alfke on 5/18/08.
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// Copyright 2008 Jens Alfke. All rights reserved.
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//
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#import "TCPEndpoint.h"
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#import <Security/Security.h>
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@class IPAddress;
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@class TCPReader, TCPWriter, TCPListener, MYBonjourService;
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@protocol TCPConnectionDelegate;
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typedef enum {
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kTCP_Disconnected = -1,
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kTCP_Closed,
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kTCP_Opening,
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kTCP_Open,
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kTCP_Closing
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} TCPConnectionStatus;
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/** A generic class that manages a TCP socket connection.
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It creates a TCPReader and a TCPWriter to handle I/O.
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TCPConnection itself mostly deals with SSL setup and opening/closing the socket.
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(The SSL related methods are inherited from TCPEndpoint.) */
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@interface TCPConnection : TCPEndpoint
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{
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@private
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TCPListener *_server;
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IPAddress *_address;
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BOOL _isIncoming, _checkedPeerCert;
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TCPConnectionStatus _status;
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TCPReader *_reader;
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TCPWriter *_writer;
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NSError *_error;
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NSTimeInterval _openTimeout;
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}
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/** Initializes a TCPConnection to the given IP address.
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Afer configuring settings, you should call -open to begin the connection. */
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- (id) initToAddress: (IPAddress*)address;
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/** Initializes a TCPConnection to the given NSNetService's address and port.
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If the service's address cannot be resolved, nil is returned. */
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- (id) initToNetService: (NSNetService*)service;
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/** Initializes a TCPConnection to the given MYBonjourService's address and port.
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If the service's address cannot be resolved, nil is returned. */
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- (id) initToBonjourService: (MYBonjourService*)service;
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/** Initializes a TCPConnection from an incoming TCP socket.
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You don't usually need to call this; TCPListener does it automatically. */
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- (id) initIncomingFromSocket: (CFSocketNativeHandle)socket listener: (TCPListener*)listener;
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/** Timeout for waiting to open a connection. (Default is zero, meaning the OS default timeout.) */
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@property NSTimeInterval openTimeout;
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/** The delegate object that will be called when the connection opens, closes or receives messages. */
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@property (assign) id<TCPConnectionDelegate> delegate;
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/** The certificate(s) of the connected peer, if this connection uses SSL.
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The items in the array are SecCertificateRefs; use the Keychain API to work with them. */
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@property (readonly) NSArray *peerSSLCerts;
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/** Connection's current status */
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@property (readonly) TCPConnectionStatus status;
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/** Opens the connection. This happens asynchronously; wait for a delegate method to be called.
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You don't need to open incoming connections received via a TCPListener. */
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- (void) open;
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/** Closes the connection, after waiting for all in-progress messages to be sent or received.
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This happens asynchronously; wait for a delegate method to be called.*/
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- (void) close;
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/** Closes the connection, like -close, but if it hasn't closed by the time the timeout
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expires, it will disconnect the socket. */
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- (void) closeWithTimeout: (NSTimeInterval)timeout;
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/** Closes all open TCPConnections. */
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+ (void) closeAllWithTimeout: (NSTimeInterval)timeout;
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/** Blocks until all open TCPConnections close. You should call +closeAllWithTimeout: first. */
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+ (void) waitTillAllClosed;
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/** The IP address of the other peer. */
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@property (readonly,retain) IPAddress *address;
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/** The TCPListener that created this incoming connection, or nil */
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@property (readonly) TCPListener *server;
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/** Is this an incoming connection, received via a TCPListener? */
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@property (readonly) BOOL isIncoming;
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/** The fatal error, if any,
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that caused the connection to fail to open or to disconnect unexpectedly. */
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@property (readonly) NSError *error;
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/** The actual security level of this connection.
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Value is nil or one of the security level constants from NSStream.h,
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such as NSStreamSocketSecurityLevelTLSv1. */
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@property (readonly) NSString* actualSecurityLevel;
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@property (readonly) TCPReader *reader;
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@property (readonly) TCPWriter *writer;
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// protected:
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- (Class) readerClass;
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- (Class) writerClass;
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- (void) _beginClose;
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- (void) _unclose;
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@end
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/** The delegate messages sent by TCPConnection.
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All methods are optional. */
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@protocol TCPConnectionDelegate <NSObject>
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@optional
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/** Called after the connection successfully opens. */
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- (void) connectionDidOpen: (TCPConnection*)connection;
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/** Called after the connection fails to open due to an error. */
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- (void) connection: (TCPConnection*)connection failedToOpen: (NSError*)error;
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/** Called when the identity of the peer is known, if using an SSL connection and the SSL
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settings say to check the peer's certificate.
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This happens, if at all, after the -connectionDidOpen: call. */
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- (BOOL) connection: (TCPConnection*)connection authorizeSSLPeer: (SecCertificateRef)peerCert;
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/** Called after the connection closes.
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You can check the connection's error property to see if it was normal or abnormal. */
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- (void) connectionDidClose: (TCPConnection*)connection;
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@end
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