/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* 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
* <https://www.gnu.org/licenses/>.
*/
#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/ObjFW.h
*
* @brief A delegate for OFDatagramSocket.
*/
@protocol OFDatagramSocketDelegate <OFObject>
@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/ObjFW.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 <OFCopying, OFReadyForReadingObserving,
OFReadyForWritingObserving>
{
OFSocketHandle _socket;
#ifdef OF_AMIGAOS
LONG _socketID;
int _family; /* unused, reserved for ABI stability */
#endif
bool _canBlock;
#ifdef OF_WII
bool _canSendToBroadcastAddresses;
#endif
id <OFDatagramSocketDelegate> _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 <OFDatagramSocketDelegate> 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