/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
* 2018
* Jonathan Schleifer <js@heap.zone>
*
* 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 "socket.h"
OF_ASSUME_NONNULL_BEGIN
/*! @file */
@class OFUDPSocket;
/*!
* @struct of_udp_socket_address_t OFUDPSocket.h ObjFW/OFUDPSocket.h
*
* @brief A struct which represents a host / port pair for a UDP socket.
*/
typedef struct OF_BOXABLE {
struct sockaddr_storage address;
socklen_t length;
} of_udp_socket_address_t;
#ifdef OF_HAVE_BLOCKS
/*!
* @brief A block which is called when the host / port pair for the UDP socket
* has been resolved.
*
* @param host The host that has been resolved
* @param port The port of the host / port pair
* @param address The address of the resolved host / port pair
* @param exception An exception which occurred while resolving or `nil` on
* success
*/
typedef void (^of_udp_socket_async_resolve_block_t)(OFString *host,
uint16_t port, of_udp_socket_address_t address, id _Nullable exception);
/*!
* @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 *socket,
void *buffer, size_t length, of_udp_socket_address_t 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 buffer A pointer to the buffer which was sent. This can be changed to
* point to a different buffer to be used on the next send.
* @param bytesSent The number of bytes which have been sent. This matches the
* length specified on the asynchronous send if no exception
* was encountered.
* @param receiver The receiver for the UDP packet. This may be set to a new
* receiver to which the next packet is sent.
* @param exception An exception which occurred while reading or `nil` on
* success
* @return The length to repeat the send with or 0 if it should not repeat.
* The buffer and receiver may be changed, so that every time a new
* buffer, length and receiver can be specified while the callback
* stays the same.
*/
typedef size_t (^of_udp_socket_async_send_block_t)(OFUDPSocket *socket,
const void *_Nonnull *_Nonnull buffer, size_t bytesSent,
of_udp_socket_address_t *_Nonnull receiver, id exception);
#endif
/*!
* @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_udp_socket_address_t. You can use
* @ref resolveAddressForHost:port:address: to create an address for a host /
* port pair and @ref getHost:andPort:forAddress: to get the host / port pair
* for an address. If you want to compare two addresses, you can use
* @ref of_udp_socket_address_equal and you can use
* @ref of_udp_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 <OFCopying, OFReadyForReadingObserving,
OFReadyForWritingObserving>
{
of_socket_t _socket;
#ifdef OF_WII
uint16_t _port;
#endif
}
/*!
* @brief Returns a new, autoreleased OFUDPSocket.
*
* @return A new, autoreleased OFUDPSocket
*/
+ (instancetype)socket;
/*!
* @brief Resolves the specified host and creates a an address for the host /
* port pair.
*
* @param host The host to resolve
* @param port The port for the resulting address
* @param address A pointer to the address that should be filled with the
* host / port pair
*/
+ (void)resolveAddressForHost: (OFString *)host
port: (uint16_t)port
address: (of_udp_socket_address_t *)address;
#ifdef OF_HAVE_THREADS
/*!
* @brief Asynchronously resolves the specified host and creates an address for
* the host / port pair.
*
* @param host The host to resolve
* @param port The port for the resulting address
* @param target The target on which to call the selector once the host has been
* resolved
* @param selector The selector to call on the target. The signature must be
* `void (OFString *host, uint16_t port,
* of_udp_socket_address_t address, id context, id exception)`.
* @param context A context object to pass along to the target
*/
+ (void)asyncResolveAddressForHost: (OFString *)host
port: (uint16_t)port
target: (id)target
selector: (SEL)selector
context: (nullable id)context;
# ifdef OF_HAVE_BLOCKS
/*!
* @brief Asynchronously resolves the specified host and creates an address for
* the host / port pair.
*
* @param host The host to resolve
* @param port The port for the resulting address
* @param block The block to execute once the host has been resolved
*/
+ (void)asyncResolveAddressForHost: (OFString *)host
port: (uint16_t)port
block: (of_udp_socket_async_resolve_block_t)block;
# endif
#endif
/*!
* @brief Gets the host and port for the specified address.
*
* @param host A pointer to an @ref OFString *. If it is not NULL, it will be
* set to the host of the host / port pair.
* @param port A pointer to an uint16_t. If it is not NULL, the port of the
* host / port pair will be written to it.
* @param address The address for which the host and port should be retrieved
*/
+ (void)getHost: (OFString *__autoreleasing _Nonnull *_Nullable)host
andPort: (nullable uint16_t *)port
forAddress: (of_udp_socket_address_t *)address;
/*!
* @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_udp_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_udp_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
* @param target The target on which the selector should be called when the
* datagram has been received. If the method 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.
* @param selector The selector to call on the target. The signature must be
* `bool (OFUDPSocket *socket, void *buffer, size_t length,
* of_udp_socket_address_t sender, id context, id exception)`.
* @param context A context object to pass along to the target
*/
- (void)asyncReceiveIntoBuffer: (void *)buffer
length: (size_t)length
target: (id)target
selector: (SEL)selector
context: (nullable id)context;
#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;
#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_udp_socket_address_t to which the
* datagram should be sent
*/
- (void)sendBuffer: (const void *)buffer
length: (size_t)length
receiver: (const of_udp_socket_address_t *)receiver;
/*!
* @brief Asynchronously 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_udp_socket_address_t to which the
* datagram should be sent
* @param target The target on which the selector should be called when the
* packet has been sent. The method should return the length for
* the next send with the same callback or 0 if it should not
* repeat. The buffer and receiver may be changed, so that every
* time a new buffer, length and receiver can be specified while
* the callback stays the same.
* @param selector The selector to call on the target. The signature must be
* `size_t (OFUDPSocket *socket, const void **buffer,
* size_t bytesSent, of_udp_socket_address_t *receiver,
* id context, id exception)`.
* @param context A context object to pass along to the target
*/
- (void)asyncSendBuffer: (const void *)buffer
length: (size_t)length
receiver: (of_udp_socket_address_t)receiver
target: (id)target
selector: (SEL)selector
context: (nullable id)context;
#ifdef OF_HAVE_BLOCKS
/*!
* @brief Asynchronously 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_udp_socket_address_t to which the
* datagram should be sent
* @param block The block to call when the packet has been sent. It should
* return the length for the next send with the same callback or 0
* if it should not repeat. The buffer and receiver may be
* changed, so that every time a new buffer, length and receiver
* can be specified while the callback stays the same.
*/
- (void)asyncSendBuffer: (const void *)buffer
length: (size_t)length
receiver: (of_udp_socket_address_t)receiver
block: (of_udp_socket_async_send_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
#ifdef __cplusplus
extern "C" {
#endif
/*!
* @brief Compares two of_udp_socket_address_t for equality.
*
* @param address1 The address to compare with the second address
* @param address2 The second address
* @return Whether the two addresses are equal
*/
extern bool of_udp_socket_address_equal(of_udp_socket_address_t *address1,
of_udp_socket_address_t *address2);
/*!
* @brief Returns the hash for the specified of_udp_socket_address_t.
*
* @param address The address to hash
* @return The hash for the specified of_udp_socket_address_t
*/
extern uint32_t of_udp_socket_address_hash(of_udp_socket_address_t *address);
#ifdef __cplusplus
}
#endif
OF_ASSUME_NONNULL_END