/*
* 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 "OFSequencedPacketSocket.h"
#import "OFRunLoop.h"
OF_ASSUME_NONNULL_BEGIN
/** @file */
@class OFSCTPSocket;
@class OFString;
/**
* @brief Flags for an SCTP packet.
*/
typedef enum {
/** The packet is sent / received out of order. */
OFSCTPPacketUnordered = 1
} OFSCTPPacketFlags;
#ifdef OF_HAVE_BLOCKS
/**
* @brief A block which is called when the socket connected.
*
* @param exception An exception which occurred while connecting the socket or
* `nil` on success
*/
typedef void (^OFSCTPSocketAsyncConnectBlock)(id _Nullable exception);
/**
* @brief A block which is called when a packet has been received.
*
* @param length The length of the packet
* @param streamID The stream ID for the message
* @param PPID The Payload Protocol Identifier for the message
* @param flags Flags for 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 (^OFSCTPSocketAsyncReceiveBlock)(size_t length, uint16_t streamID,
uint32_t PPID, OFSCTPPacketFlags flags, 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 (^OFSCTPSocketAsyncSendDataBlock)(
id _Nullable exception);
#endif
/**
* @protocol OFSCTPSocketDelegate OFSCTPSocket.h ObjFW/OFSCTPSocket.h
*
* A delegate for OFSCTPSocket.
*/
@protocol OFSCTPSocketDelegate <OFSequencedPacketSocketDelegate>
@optional
/**
* @brief A method which is called when a socket connected.
*
* @param socket The socket which connected
* @param host The host connected to
* @param port The port on the host connected to
* @param exception An exception that occurred while connecting, or nil on
* success
*/
- (void)socket: (OFSCTPSocket *)socket
didConnectToHost: (OFString *)host
port: (uint16_t)port
exception: (nullable id)exception;
/**
* @brief This method is called when a packet has been received.
*
* @param socket The sequenced packet socket which received a packet
* @param buffer The buffer the packet has been written to
* @param length The length of the packet
* @param streamID The stream ID for the message
* @param PPID The Payload Protocol Identifier for the message
* @param flags Flags for 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: (OFSCTPSocket *)socket
didReceiveIntoBuffer: (void *)buffer
length: (size_t)length
streamID: (uint16_t)streamID
PPID: (uint32_t)PPID
flags: (OFSCTPPacketFlags)flags
exception: (nullable id)exception;
/**
* @brief This method is called when a packet has been sent.
*
* @param socket The sequenced packet socket which sent a packet
* @param data The data which was sent
* @param streamID The stream ID for the message
* @param PPID The Payload Protocol Identifier for the message
* @param flags Flags 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: (OFSCTPSocket *)socket
didSendData: (OFData *)data
streamID: (uint16_t)streamID
PPID: (uint32_t)PPID
flags: (OFSCTPPacketFlags)flags
exception: (nullable id)exception;
@end
/**
* @class OFSCTPSocket OFSCTPSocket.h ObjFW/OFSCTPSocket.h
*
* @brief A class which provides methods to create and use SCTP sockets in
* one-to-one mode.
*
* To connect to a server, create a socket and connect it.
* To create a server, create a socket, bind it and listen on it.
*/
@interface OFSCTPSocket: OFSequencedPacketSocket
{
OF_RESERVE_IVARS(OFSCTPSocket, 4)
}
/**
* @brief Whether sending packets can be delayed. Setting this to NO sets
* SCTP_NODELAY on the socket.
*
* @throw OFGetOptionFailedException The option could not be retrieved
* @throw OFSetOptionFailedException The option could not be set
*/
@property (nonatomic) bool canDelaySendingPackets;
/**
* @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 <OFSCTPSocketDelegate> delegate;
/**
* @brief Connect the OFSCTPSocket to the specified destination.
*
* @param host The host to connect to
* @param port The port on the host to connect to
* @throw OFConnectIPSocketFailedException Connecting failed
* @throw OFAlreadyOpenException The socket is already connected or bound
*/
- (void)connectToHost: (OFString *)host port: (uint16_t)port;
/**
* @brief Asynchronously connect the OFSCTPSocket to the specified destination.
*
* @param host The host to connect to
* @param port The port on the host to connect to
*/
- (void)asyncConnectToHost: (OFString *)host port: (uint16_t)port;
/**
* @brief Asynchronously connect the OFSCTPSocket to the specified destination.
*
* @param host The host to connect to
* @param port The port on the host to connect to
* @param runLoopMode The run loop mode in which to perform the async connect
*/
- (void)asyncConnectToHost: (OFString *)host
port: (uint16_t)port
runLoopMode: (OFRunLoopMode)runLoopMode;
#ifdef OF_HAVE_BLOCKS
/**
* @brief Asynchronously connect the OFSCTPSocket to the specified destination.
*
* @param host The host to connect to
* @param port The port on the host to connect to
* @param block The block to execute once the connection has been established
*/
- (void)asyncConnectToHost: (OFString *)host
port: (uint16_t)port
block: (OFSCTPSocketAsyncConnectBlock)block;
/**
* @brief Asynchronously connect the OFSCTPSocket to the specified destination.
*
* @param host The host to connect to
* @param port The port on the host to connect to
* @param runLoopMode The run loop mode in which to perform the async connect
* @param block The block to execute once the connection has been established
*/
- (void)asyncConnectToHost: (OFString *)host
port: (uint16_t)port
runLoopMode: (OFRunLoopMode)runLoopMode
block: (OFSCTPSocketAsyncConnectBlock)block;
#endif
/**
* @brief Bind 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 address the socket was bound to
* @throw OFBindIPSocketFailedException Binding failed
* @throw OFAlreadyOpenException The socket is already connected or bound
*/
- (OFSocketAddress)bindToHost: (OFString *)host port: (uint16_t)port;
/**
* @brief Receives a packet for the specified stream and stores it into the
* specified buffer.
*
* If the buffer is too small, the packet is truncated.
*
* @param buffer The buffer to write the packet to
* @param length The length of the buffer
* @param streamID The stream ID for the message
* @param PPID The Payload Protocol Identifier for the message
* @param flags Flags for the packet
* @return The length of the received packet
* @throw OFReadFailedException Receiving failed
* @throw OFNotOpenException The socket is not open
*/
- (size_t)receiveIntoBuffer: (void *)buffer
length: (size_t)length
streamID: (nullable uint16_t *)streamID
PPID: (nullable uint32_t *)PPID
flags: (nullable OFSCTPPacketFlags *)flags;
/**
* @brief Asynchronously receives a packet with stream ID and PPID and stores
* it into the specified buffer.
*
* If the buffer is too small, the packet is truncated.
*
* @param buffer The buffer to write the packet to
* @param length The length of the buffer
*/
- (void)asyncReceiveWithInfoIntoBuffer: (void *)buffer
length: (size_t)length;
/**
* @brief Asynchronously receives a packet with stream ID and PPID and stores
* it into the specified buffer.
*
* If the buffer is too small, the packet is truncated.
*
* @param buffer The buffer to write the packet to
* @param length The length of the buffer
* @param runLoopMode The run loop mode in which to perform the asynchronous
* receive
*/
- (void)asyncReceiveWithInfoIntoBuffer: (void *)buffer
length: (size_t)length
runLoopMode: (OFRunLoopMode)runLoopMode;
#ifdef OF_HAVE_BLOCKS
/**
* @brief Asynchronously receives a packet with stream ID and PPID and stores
* it into the specified buffer.
*
* If the buffer is too small, the packet is truncated.
*
* @param buffer The buffer to write the packet to
* @param length The length of the buffer
* @param block The block to call when the packet has been received. If the
* block returns true, it will be called again with the same
* buffer and maximum length when more packets have been received.
* If you want the next method in the queue to handle the packet
* received next, you need to return false from the method.
*/
- (void)asyncReceiveWithInfoIntoBuffer: (void *)buffer
length: (size_t)length
block: (OFSCTPSocketAsyncReceiveBlock)block;
/**
* @brief Asynchronously receives a packet with stream ID and PPID and stores
* it into the specified buffer.
*
* If the buffer is too small, the packet is truncated.
*
* @param buffer The buffer to write the packet 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 packet has been received. If the
* block returns true, it will be called again with the same
* buffer and maximum length when more packets have been received.
* If you want the next method in the queue to handle the packet
* received next, you need to return false from the method.
*/
- (void)asyncReceiveWithInfoIntoBuffer: (void *)buffer
length: (size_t)length
runLoopMode: (OFRunLoopMode)runLoopMode
block: (OFSCTPSocketAsyncReceiveBlock)block;
#endif
/**
* @brief Sends the specified packet on the specified stream.
*
* @param buffer The buffer to send as a packet
* @param length The length of the buffer
* @param streamID The stream ID for the message
* @param PPID The Payload Protocol Identifier for the message
* @param flags Flags for the packet
* @throw OFWriteFailedException Sending failed
* @throw OFNotOpenException The socket is not open
*/
- (void)sendBuffer: (const void *)buffer
length: (size_t)length
streamID: (uint16_t)streamID
PPID: (uint32_t)PPID
flags: (OFSCTPPacketFlags)flags;
/**
* @brief Asynchronously sends the specified packet on the specified stream.
*
* @param data The data to send as a packet
* @param streamID The stream ID for the message
* @param PPID The Payload Protocol Identifier for the message
* @param flags Flags for the packet
*/
- (void)asyncSendData: (OFData *)data
streamID: (uint16_t)streamID
PPID: (uint32_t)PPID
flags: (OFSCTPPacketFlags)flags;
/**
* @brief Asynchronously sends the specified packet on the specified stream.
*
* @param data The data to send as a packet
* @param streamID The stream ID for the message
* @param PPID The Payload Protocol Identifier for the message
* @param flags Flags for the packet
* @param runLoopMode The run loop mode in which to perform the asynchronous
* send
*/
- (void)asyncSendData: (OFData *)data
streamID: (uint16_t)streamID
PPID: (uint32_t)PPID
flags: (OFSCTPPacketFlags)flags
runLoopMode: (OFRunLoopMode)runLoopMode;
#ifdef OF_HAVE_BLOCKS
/**
* @brief Asynchronously sends the specified packet on the specified stream.
*
* @param data The data to send as a packet
* @param streamID The stream ID for the message
* @param PPID The Payload Protocol Identifier for the message
* @param flags Flags for the packet
* @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
streamID: (uint16_t)streamID
PPID: (uint32_t)PPID
flags: (OFSCTPPacketFlags)flags
block: (OFSCTPSocketAsyncSendDataBlock)block;
/**
* @brief Asynchronously sends the specified packet on the specified stream.
*
* @param data The data to send as a packet
* @param streamID The stream ID for the message
* @param PPID The Payload Protocol Identifier for the message
* @param flags Flags for the packet
* @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
streamID: (uint16_t)streamID
PPID: (uint32_t)PPID
flags: (OFSCTPPacketFlags)flags
runLoopMode: (OFRunLoopMode)runLoopMode
block: (OFSCTPSocketAsyncSendDataBlock)block;
#endif
@end
OF_ASSUME_NONNULL_END