/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014
* Jonathan Schleifer <js@webkeks.org>
*
* 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"
/*! @file */
/*!
* @brief A struct which represents a host / port pair for a UDP socket.
*/
typedef struct {
struct sockaddr_storage address;
socklen_t length;
} of_udp_socket_address_t;
/*!
* @brief A class which provides functions 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 hostForAddress:port: 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.
*/
@interface OFUDPSocket: OFObject <OFReadyForReadingObserving,
OFReadyForWritingObserving>
{
int _socket;
}
/*!
* @brief Returns a new, autoreleased OFUDPSocket.
*
* @return A new, autoreleased OFUDPSocket
*/
+ (instancetype)socket;
/*!
* @brief Resolves the specified host and creates a host / port pair together
* with the specified port.
*
* @param host The host to resolve
* @param port The port for the resulting host / port pair
* @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;
/*!
* @brief Returns the host for the specified address and optionally the port.
*
* @param address The address for which the host and (optionally) the port
* should be returned
* @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.
* @return The host of the host / port pair
*/
+ (OFString*)hostForAddress: (of_udp_socket_address_t*)address
port: (uint16_t*)port;
/*!
* @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 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: (of_udp_socket_address_t*)receiver;
/*!
* @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