/* * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, * 2018, 2019 * Jonathan Schleifer * * All rights reserved. * * This file is part of ObjFW. It may be distributed under the terms of the * Q Public License 1.0, which can be found in the file LICENSE.QPL included in * the packaging of this file. * * Alternatively, it may be distributed under the terms of the GNU General * Public License, either version 2 or 3, which can be found in the file * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this * file. */ #import "OFObject.h" #import "OFKernelEventObserver.h" #import "OFRunLoop.h" #import "socket.h" OF_ASSUME_NONNULL_BEGIN /*! @file */ @class OFUDPSocket; #ifdef OF_HAVE_BLOCKS /*! * @brief A block which is called when a packet has been received. * * @param socket The UDP socket which received a packet * @param buffer The buffer the packet has been written to * @param length The length of the packet * @param sender The address of the sender of the packet * @param exception An exception which occurred while receiving or `nil` on * success * @return A bool whether the same block should be used for the next receive */ typedef bool (^of_udp_socket_async_receive_block_t)( OFUDPSocket *_Nonnull socket, void *_Nonnull buffer, size_t length, const of_socket_address_t *_Nonnull sender, id _Nullable exception); /*! * @brief A block which is called when a packet has been sent. * * @param socket The UDP socket which sent a packet * @param data The data which was sent * @param receiver The receiver for the UDP packet * @param exception An exception which occurred while reading or `nil` on * success * @return The data to repeat the send with or nil if it should not repeat */ typedef OFData *_Nullable (^of_udp_socket_async_send_data_block_t)( OFUDPSocket *_Nonnull socket, OFData *_Nonnull data, const of_socket_address_t *_Nonnull receiver, id _Nullable exception); #endif /*! * @protocol OFUDPSocketDelegate OFUDPSocket.h ObjFW/OFUDPSocket.h * * @brief A delegate for OFUDPSocket. */ @protocol OFUDPSocketDelegate @optional /*! * @brief This method is called when a packet has been received. * * @param socket The UDP socket which received a packet * @param buffer The buffer the packet has been written to * @param length The length of the packet * @param sender The address of the sender of the packet * @param exception An exception that occurred while receiving, or nil on * success * @return A bool whether the same block should be used for the next receive */ - (bool)socket: (OFUDPSocket *)socket didReceiveIntoBuffer: (void *)buffer length: (size_t)length sender: (const of_socket_address_t *_Nonnull)sender exception: (nullable id)exception; /*! * @brief This which is called when a packet has been sent. * * @param socket The UDP socket which sent a packet * @param data The data which was sent * @param receiver The receiver for the UDP packet * @param exception An exception that occurred while sending, or nil on success * @return The data to repeat the send with or nil if it should not repeat */ - (nullable OFData *)socket: (OFUDPSocket *)socket didSendData: (OFData *)data receiver: (const of_socket_address_t *_Nonnull)receiver exception: (nullable id)exception; @end /*! * @class OFUDPSocket OFUDPSocket.h ObjFW/OFUDPSocket.h * * @brief A class which provides methods to create and use UDP sockets. * * Addresses are of type @ref of_socket_address_t. You can use the current * thread's @ref OFDNSResolver to create an address for a host / port pair and * @ref of_socket_address_ip_string to get the IP string / port pair for an * address. If you want to compare two addresses, you can use @ref * of_socket_address_equal and you can use @ref of_socket_address_hash to get a * hash to use in e.g. @ref OFMapTable. * * @warning Even though the OFCopying protocol is implemented, it does *not* * return an independent copy of the socket, but instead retains it. * This is so that the socket can be used as a key for a dictionary, * so context can be associated with a socket. Using a socket in more * than one thread at the same time is not thread-safe, even if copy * was called to create one "instance" for every thread! */ @interface OFUDPSocket: OFObject { of_socket_t _socket; #ifdef OF_WII uint16_t _port; #endif bool _blocking; id _Nullable _delegate; } /*! * @brief Whether the socket is in blocking mode. * * By default, a socket is in blocking mode. */ @property (nonatomic, getter=isBlocking) bool blocking; /*! * @brief The delegate for asynchronous operations on the socket. * * @note The delegate is retained for as long as asynchronous operations are * still outstanding. */ @property OF_NULLABLE_PROPERTY (assign, nonatomic) id delegate; /*! * @brief Returns a new, autoreleased OFUDPSocket. * * @return A new, autoreleased OFUDPSocket */ + (instancetype)socket; /*! * @brief Binds the socket to the specified host and port. * * @param host The host to bind to. Use `@"0.0.0.0"` for IPv4 or `@"::"` for * IPv6 to bind to all. * @param port The port to bind to. If the port is 0, an unused port will be * chosen, which can be obtained using the return value. * @return The port the socket was bound to */ - (uint16_t)bindToHost: (OFString *)host port: (uint16_t)port; /*! * @brief Receives a datagram and stores it into the specified buffer. * * If the buffer is too small, the datagram is truncated. * * @param buffer The buffer to write the datagram to * @param length The length of the buffer * @param sender A pointer to an @ref of_socket_address_t, which will be set to * the address of the sender * @return The length of the received datagram */ - (size_t)receiveIntoBuffer: (void *)buffer length: (size_t)length sender: (of_socket_address_t *)sender; /*! * @brief Asynchronously receives a datagram and stores it into the specified * buffer. * * If the buffer is too small, the datagram is truncated. * * @param buffer The buffer to write the datagram to * @param length The length of the buffer */ - (void)asyncReceiveIntoBuffer: (void *)buffer length: (size_t)length; /*! * @brief Asynchronously receives a datagram and stores it into the specified * buffer. * * If the buffer is too small, the datagram is truncated. * * @param buffer The buffer to write the datagram to * @param length The length of the buffer * @param runLoopMode The run loop mode in which to perform the async receive */ - (void)asyncReceiveIntoBuffer: (void *)buffer length: (size_t)length runLoopMode: (of_run_loop_mode_t)runLoopMode; #ifdef OF_HAVE_BLOCKS /*! * @brief Asynchronously receives a datagram and stores it into the specified * buffer. * * If the buffer is too small, the datagram is truncated. * * @param buffer The buffer to write the datagram to * @param length The length of the buffer * @param block The block to call when the datagram has been received. If the * block returns true, it will be called again with the same * buffer and maximum length when more datagrams have been * received. If you want the next method in the queue to handle * the datagram received next, you need to return false from the * method. */ - (void)asyncReceiveIntoBuffer: (void *)buffer length: (size_t)length block: (of_udp_socket_async_receive_block_t)block; /*! * @brief Asynchronously receives a datagram and stores it into the specified * buffer. * * If the buffer is too small, the datagram is truncated. * * @param buffer The buffer to write the datagram to * @param length The length of the buffer * @param runLoopMode The run loop mode in which to perform the async receive * @param block The block to call when the datagram has been received. If the * block returns true, it will be called again with the same * buffer and maximum length when more datagrams have been * received. If you want the next method in the queue to handle * the datagram received next, you need to return false from the * method. */ - (void)asyncReceiveIntoBuffer: (void *)buffer length: (size_t)length runLoopMode: (of_run_loop_mode_t)runLoopMode block: (of_udp_socket_async_receive_block_t)block; #endif /*! * @brief Sends the specified datagram to the specified address. * * @param buffer The buffer to send as a datagram * @param length The length of the buffer * @param receiver A pointer to an @ref of_socket_address_t to which the * datagram should be sent */ - (void)sendBuffer: (const void *)buffer length: (size_t)length receiver: (const of_socket_address_t *)receiver; /*! * @brief Asynchronously sends the specified datagram to the specified address. * * @param data The data to send as a datagram * @param receiver A pointer to an @ref of_socket_address_t to which the * datagram should be sent. The receiver is copied. */ - (void)asyncSendData: (OFData *)data receiver: (const of_socket_address_t *)receiver; /*! * @brief Asynchronously sends the specified datagram to the specified address. * * @param data The data to send as a datagram * @param receiver A pointer to an @ref of_socket_address_t to which the * datagram should be sent. The receiver is copied. * @param runLoopMode The run loop mode in which to perform the async send */ - (void)asyncSendData: (OFData *)data receiver: (const of_socket_address_t *)receiver runLoopMode: (of_run_loop_mode_t)runLoopMode; #ifdef OF_HAVE_BLOCKS /*! * @brief Asynchronously sends the specified datagram to the specified address. * * @param data The data to send as a datagram * @param receiver A pointer to an @ref of_socket_address_t to which the * datagram should be sent. The receiver is copied. * @param block The block to call when the packet has been sent. It should * return the data for the next send with the same callback or nil * if it should not repeat. */ - (void)asyncSendData: (OFData *)data receiver: (const of_socket_address_t *)receiver block: (of_udp_socket_async_send_data_block_t)block; /*! * @brief Asynchronously sends the specified datagram to the specified address. * * @param data The data to send as a datagram * @param receiver A pointer to an @ref of_socket_address_t to which the * datagram should be sent. The receiver is copied. * @param runLoopMode The run loop mode in which to perform the async send * @param block The block to call when the packet has been sent. It should * return the data for the next send with the same callback or nil * if it should not repeat. */ - (void)asyncSendData: (OFData *)data receiver: (const of_socket_address_t *)receiver runLoopMode: (of_run_loop_mode_t)runLoopMode block: (of_udp_socket_async_send_data_block_t)block; #endif /*! * @brief Cancels all pending asynchronous requests on the socket. */ - (void)cancelAsyncRequests; /*! * @brief Closes the socket so that it can neither receive nor send any more * datagrams. */ - (void)close; @end OF_ASSUME_NONNULL_END