/* * Copyright (c) 2008-2024 Jonathan Schleifer * * All rights reserved. * * This program is free software: you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License version 3.0 only, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License * version 3.0 for more details. * * You should have received a copy of the GNU Lesser General Public License * version 3.0 along with this program. If not, see * . */ #import "OFObject.h" #import "OFKernelEventObserver.h" #import "OFRunLoop.h" #import "OFSocket.h" OF_ASSUME_NONNULL_BEGIN /** @file */ @class OFData; @class OFDatagramSocket; #ifdef OF_HAVE_BLOCKS /** * @brief A block which is called when a packet has been received. * * @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 (^OFDatagramSocketAsyncReceiveBlock)(size_t length, const OFSocketAddress *_Nonnull sender, id _Nullable exception); /** * @brief A block which is called when a packet has been sent. * * @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 (^OFDatagramSocketAsyncSendDataBlock)( id _Nullable exception); #endif /** * @protocol OFDatagramSocketDelegate OFDatagramSocket.h \ * ObjFW/OFDatagramSocket.h * * @brief A delegate for OFDatagramSocket. */ @protocol OFDatagramSocketDelegate @optional /** * @brief This method is called when a packet has been received. * * @param socket The datagram 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: (OFDatagramSocket *)socket didReceiveIntoBuffer: (void *)buffer length: (size_t)length sender: (const OFSocketAddress *_Nonnull)sender exception: (nullable id)exception; /** * @brief This method is called when a packet has been sent. * * @param socket The datagram socket which sent a packet * @param data The data which was sent * @param receiver The receiver for the 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: (OFDatagramSocket *)socket didSendData: (OFData *)data receiver: (const OFSocketAddress *_Nonnull)receiver exception: (nullable id)exception; @end /** * @class OFDatagramSocket OFDatagramSocket.h ObjFW/OFDatagramSocket.h * * @brief A base class for datagram sockets. * * @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 OFDatagramSocket: OFObject { OFSocketHandle _socket; #ifdef OF_AMIGAOS LONG _socketID; int _family; /* unused, reserved for ABI stability */ #endif bool _canBlock; #ifdef OF_WII bool _canSendToBroadcastAddresses; #endif id _Nullable _delegate; OF_RESERVE_IVARS(OFDatagramSocket, 4) } /** * @brief Whether the socket can block. * * By default, a socket can block. * * @throw OFGetOptionFailedException The option could not be retrieved * @throw OFSetOptionFailedException The option could not be set */ @property (nonatomic) bool canBlock; /** * @brief Whether the socket can send to broadcast addresses. * * @throw OFGetOptionFailedException The option could not be retrieved * @throw OFSetOptionFailedException The option could not be set */ @property (nonatomic) bool canSendToBroadcastAddresses; /** * @brief The delegate for asynchronous operations on the socket. * * @note The delegate is retained for as long as asynchronous operations are * still ongoing. */ @property OF_NULLABLE_PROPERTY (assign, nonatomic) id delegate; /** * @brief Returns a new, autoreleased OFDatagramSocket. * * @return A new, autoreleased OFDatagramSocket */ + (instancetype)socket; /** * @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 OFSocketAddress, which will be set to the * address of the sender * @return The length of the received datagram * @throw OFReadFailedException Receiving failed * @throw OFNotOpenException The socket is not open */ - (size_t)receiveIntoBuffer: (void *)buffer length: (size_t)length sender: (nullable OFSocketAddress *)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 asynchronous * receive */ - (void)asyncReceiveIntoBuffer: (void *)buffer length: (size_t)length runLoopMode: (OFRunLoopMode)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: (OFDatagramSocketAsyncReceiveBlock)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 asynchronous * 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: (OFRunLoopMode)runLoopMode block: (OFDatagramSocketAsyncReceiveBlock)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 OFSocketAddress to which the datagram * should be sent * @throw OFWriteFailedException Sending failed * @throw OFNotOpenException The socket is not open */ - (void)sendBuffer: (const void *)buffer length: (size_t)length receiver: (const OFSocketAddress *)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 OFSocketAddress to which the datagram * should be sent. The receiver is copied. */ - (void)asyncSendData: (OFData *)data receiver: (const OFSocketAddress *)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 OFSocketAddress to which the datagram * should be sent. The receiver is copied. * @param runLoopMode The run loop mode in which to perform the asynchronous * send */ - (void)asyncSendData: (OFData *)data receiver: (const OFSocketAddress *)receiver runLoopMode: (OFRunLoopMode)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 OFSocketAddress 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 OFSocketAddress *)receiver block: (OFDatagramSocketAsyncSendDataBlock)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 OFSocketAddress to which the datagram * should be sent. The receiver is copied. * @param runLoopMode The run loop mode in which to perform the asynchronous * 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 OFSocketAddress *)receiver runLoopMode: (OFRunLoopMode)runLoopMode block: (OFDatagramSocketAsyncSendDataBlock)block; #endif /** * @brief Releases the socket from the current thread. * * This is necessary on some platforms in order to allow a different thread to * use the socket, e.g. on AmigaOS, but you should call it on all operating * systems before using the socket from a different thread. * * After calling this method, you must no longer use the socket until * @ref obtainSocketForCurrentThread has been called. */ - (void)releaseSocketFromCurrentThread; /** * @brief Obtains the socket for the current thread. * * This is necessary on some platforms in order to allow a different thread to * use the socket, e.g. on AmigaOS, but you should call it on all operating * systems before using the socket from a different thread. * * You must only call this method after @ref releaseSocketFromCurrentThread has * been called from a different thread. */ - (void)obtainSocketForCurrentThread; /** * @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. * * @throw OFNotOpenException The socket is not open */ - (void)close; @end OF_ASSUME_NONNULL_END