iOS UDP demo

// // GCDAsyncSocket.h // // This class is in the public domain. // Originally created by Robbie Hanson in Q3 2010. // Updated and maintained by Deusty LLC and the Apple development community. // // https://github.com/robbiehanson/CocoaAsyncSocket // #import <Foundation/Foundation.h> #import <Security/Security.h> #import <Security/SecureTransport.h> #import <dispatch/dispatch.h> @class GCDAsyncReadPacket; @class GCDAsyncWritePacket; @class GCDAsyncSocketPreBuffer; #if TARGET_OS_IPHONE // Compiling for iOS #if __IPHONE_OS_VERSION_MAX_ALLOWED >= 50000 // iOS 5.0 supported #if __IPHONE_OS_VERSION_MIN_REQUIRED >= 50000 // iOS 5.0 supported and required #define IS_SECURE_TRANSPORT_AVAILABLE YES #define SECURE_TRANSPORT_MAYBE_AVAILABLE 1 #define SECURE_TRANSPORT_MAYBE_UNAVAILABLE 0 #else // iOS 5.0 supported but not required #ifndef NSFoundationVersionNumber_iPhoneOS_5_0 #define NSFoundationVersionNumber_iPhoneOS_5_0 881.00 #endif #define IS_SECURE_TRANSPORT_AVAILABLE (NSFoundationVersionNumber >= NSFoundationVersionNumber_iPhoneOS_5_0) #define SECURE_TRANSPORT_MAYBE_AVAILABLE 1 #define SECURE_TRANSPORT_MAYBE_UNAVAILABLE 1 #endif #else // iOS 5.0 not supported #define IS_SECURE_TRANSPORT_AVAILABLE NO #define SECURE_TRANSPORT_MAYBE_AVAILABLE 0 #define SECURE_TRANSPORT_MAYBE_UNAVAILABLE 1 #endif #else // Compiling for Mac OS X #define IS_SECURE_TRANSPORT_AVAILABLE YES #define SECURE_TRANSPORT_MAYBE_AVAILABLE 1 #define SECURE_TRANSPORT_MAYBE_UNAVAILABLE 0 #endif extern NSString *const GCDAsyncSocketException; extern NSString *const GCDAsyncSocketErrorDomain; extern NSString *const GCDAsyncSocketQueueName; extern NSString *const GCDAsyncSocketThreadName; #if SECURE_TRANSPORT_MAYBE_AVAILABLE extern NSString *const GCDAsyncSocketSSLCipherSuites; #if TARGET_OS_IPHONE extern NSString *const GCDAsyncSocketSSLProtocolVersionMin; extern NSString *const GCDAsyncSocketSSLProtocolVersionMax; #else extern NSString *const GCDAsyncSocketSSLDiffieHellmanParameters; #endif #endif enum GCDAsyncSocketError { GCDAsyncSocketNoError = 0, // Never used GCDAsyncSocketBadConfigError, // Invalid configuration GCDAsyncSocketBadParamError, // Invalid parameter was passed GCDAsyncSocketConnectTimeoutError, // A connect operation timed out GCDAsyncSocketReadTimeoutError, // A read operation timed out GCDAsyncSocketWriteTimeoutError, // A write operation timed out GCDAsyncSocketReadMaxedOutError, // Reached set maxLength without completing GCDAsyncSocketClosedError, // The remote peer closed the connection GCDAsyncSocketOtherError, // Description provided in userInfo }; typedef enum GCDAsyncSocketError GCDAsyncSocketError; //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// #pragma mark - //////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// @interface GCDAsyncSocket : NSObject /** * GCDAsyncSocket uses the standard delegate paradigm, * but executes all delegate callbacks on a given delegate dispatch queue. * This allows for maximum concurrency, while at the same time providing easy thread safety. * * You MUST set a delegate AND delegate dispatch queue before attempting to * use the socket, or you will get an error. * * The socket queue is optional. * If you pass NULL, GCDAsyncSocket will automatically create it's own socket queue. * If you choose to provide a socket queue, the socket queue must not be a concurrent queue. * If you choose to provide a socket queue, and the socket queue has a configured target queue, * then please see the discussion for the method markSocketQueueTargetQueue. * * The delegate queue and socket queue can optionally be the same. **/ - (id)init; - (id)initWithSocketQueue:(dispatch_queue_t)sq; - (id)initWithDelegate:(id)aDelegate delegateQueue:(dispatch_queue_t)dq; - (id)initWithDelegate:(id)aDelegate delegateQueue:(dispatch_queue_t)dq socketQueue:(dispatch_queue_t)sq; #pragma mark Configuration - (id)delegate; - (void)setDelegate:(id)delegate; - (void)synchronouslySetDelegate:(id)delegate; - (dispatch_queue_t)delegateQueue; - (void)setDelegateQueue:(dispatch_queue_t)delegateQueue; - (void)synchronouslySetDelegateQueue:(dispatch_queue_t)delegateQueue; - (void)getDelegate:(id *)delegatePtr delegateQueue:(dispatch_queue_t *)delegateQueuePtr; - (void)setDelegate:(id)delegate delegateQueue:(dispatch_queue_t)delegateQueue; - (void)synchronouslySetDelegate:(id)delegate delegateQueue:(dispatch_queue_t)delegateQueue; /** * By default, both IPv4 and IPv6 are enabled. * * For accepting incoming connections, this means GCDAsyncSocket automatically supports both protocols, * and can simulataneously accept incoming connections on either protocol. * * For outgoing connections, this means GCDAsyncSocket can connect to remote hosts running either protocol. * If a DNS lookup returns only IPv4 results, GCDAsyncSocket will automatically use IPv4. * If a DNS lookup returns only IPv6 results, GCDAsyncSocket will automatically use IPv6. * If a DNS lookup returns both IPv4 and IPv6 results, the preferred protocol will be chosen. * By default, the preferred protocol is IPv4, but may be configured as desired. **/ - (BOOL)isIPv4Enabled; - (void)setIPv4Enabled:(BOOL)flag; - (BOOL)isIPv6Enabled; - (void)setIPv6Enabled:(BOOL)flag; - (BOOL)isIPv4PreferredOverIPv6; - (void)setPreferIPv4OverIPv6:(BOOL)flag; /** * User data allows you to associate arbitrary information with the socket. * This data is not used internally by socket in any way. **/ - (id)userData; - (void)setUserData:(id)arbitraryUserData; #pragma mark Accepting /** * Tells the socket to begin listening and accepting connections on the given port. * When a connection is accepted, a new instance of GCDAsyncSocket will be spawned to handle it, * and the socket:didAcceptNewSocket: delegate method will be invoked. * * The socket will listen on all available interfaces (e.g. wifi, ethernet, etc) **/ - (BOOL)acceptOnPort:(uint16_t)port error:(NSError **)errPtr; /** * This method is the same as acceptOnPort:error: with the * additional option of specifying which interface to listen on. * * For example, you could specify that the socket should only accept connections over ethernet, * and not other interfaces such as wifi. * * The interface may be specified by name (e.g. "en1" or "lo0") or by IP address (e.g. "192.168.4.34"). * You may also use the special strings "localhost" or "loopback" to specify that * the socket only accept connections from the local machine. * * You can see the list of interfaces via the command line utility "ifconfig", * or programmatically via the getifaddrs() function. * * To accept connections on any interface pass nil, or simply use the acceptOnPort:error: method. **/ - (BOOL)acceptOnInterface:(NSString *)interface port:(uint16_t)port error:(NSError **)errPtr; #pragma mark Connecting /** * Connects to the given host and port. * * This method invokes connectToHost:onPort:viaInterface:withTimeout:error: * and uses the default interface, and no timeout. **/ - (BOOL)connectToHost:(NSString *)host onPort:(uint16_t)port error:(NSError **)errPtr; /** * Connects to the given host and port with an optional timeout. * * This method invokes connectToHost:onPort:viaInterface:withTimeout:error: and uses the default interface. **/ - (BOOL)connectToHost:(NSString *)host onPort:(uint16_t)port withTimeout:(NSTimeInterval)timeout error:(NSError **)errPtr; /** * Connects to the given host & port, via the optional interface, with an optional timeout. * * The host may be a