man ost_UDPSocket (Fonctions bibliothèques) - UDP sockets implement the TCP SOCK_DGRAM UDP protocol.Unreliable Datagram Protocol sockets.

NAME

ost::UDPSocket - UDP sockets implement the TCP SOCK_DGRAM UDP protocol.Unreliable Datagram Protocol sockets.

SYNOPSIS



#include <socket.h>

Inherits ost::Socket.

Inherited by ost::UDPBroadcast, ost::UDPReceive [protected], and ost::UDPTransmit [protected].

Public Member Functions

UDPSocket (Family family=IPV4)

Create an unbound UDP socket, mostly for internal use. UDPSocket (const char *name, Family family=IPV4)

Create a UDP socket bound by a service name. UDPSocket (const IPV4Address &bind, tpport_t port)

Create a UDP socket and bind it to a specific interface and port address so that other UDP sockets on remote machines (or the same host) may find and send UDP messages to it. UDPSocket (const IPV6Address &bind, tpport_t port)

virtual ~UDPSocket ()

Destroy a UDP socket as a socket. Error setLoopback (bool enable)

Set the loopback. Error setMulticast (bool enable)

Set the multicast. Error setTimeToLive (char ttl)

Set time to live. void setPeer (const IPV4Host &host, tpport_t port)

set the peer address to send message packets to. void connect (const IPV4Host &host, tpport_t port)

void setPeer (const IPV6Host &host, tpport_t port)

void connect (const IPV6Host &host, tpport_t port)

Socket::Error getInterfaceIndex (const char *ethX, int &InterfaceIndex)

get the interface index for a named network device Socket::Error join (const IPV4Multicast &ia, int InterfaceIndex)

join a multicast group on a particular interface ssize_t send (const void *buf, size_t len)

Send a message packet to a peer host. ssize_t receive (void *buf, size_t len, bool reply=false)

Receive a message from any host. IPV4Host getIPV4Peer (tpport_t *port=NULL) const

Examine address of sender of next waiting packet. IPV4Host getPeer (tpport_t *port=NULL) const

IPV6Host getIPV6Peer (tpport_t *port=NULL) const

ssize_t peek (void *buf, size_t len)

Examine contents of next waiting packet. void setPeer (const char *service)

Associate socket with a named connection. void connect (const char *service)

Error disconnect (void)

Disassociate this socket from any host connection.

Protected Attributes

union {

sockaddr_in6 ipv6

sockaddr_in ipv4

} peer

Family family

Detailed Description

UDP sockets implement the TCP SOCK_DGRAM UDP protocol.Unreliable Datagram Protocol sockets.

They can be used to pass unverified messages between hosts, or to broadcast a specific message to an entire subnet. Please note that Streaming of realtime data commonly use UDPDuplex related classes rather than UDPSocket.

In addition to connected TCP sessions, Common C++ supports UDP sockets and these also cover a range of functionality. Like a TCPSocket, A UDPSocket can be created bound to a specific network interface and/or port address, though this is not required. UDP sockets also are usually either connected or otherwise 'associated' with a specific 'peer' UDP socket. Since UDP sockets operate through discreet packets, there are no streaming operators used with UDP sockets.

In addition to the UDP 'socket' class, there is a 'UDPBroadcast' class. The UDPBroadcast is a socket that is set to send messages to a subnet as a whole rather than to an individual peer socket that it may be associated with.

UDP sockets are often used for building 'realtime' media streaming protocols and full duplex messaging services. When used in this manner, typically a pair of UDP sockets are used together; one socket is used to send and the other to receive data with an associated pair of UDP sockets on a 'peer' host. This concept is represented through the Common C++ UDPDuplex object, which is a pair of sockets that communicate with another UDPDuplex pair.

Author: David Sugar <dyfet@ostel.com>

Constructor & Destructor Documentation

ost::UDPSocket::UDPSocket (Family family = IPV4)

Create an unbound UDP socket, mostly for internal use.

ost::UDPSocket::UDPSocket (const char * name, Family family = IPV4)

Create a UDP socket bound by a service name.

ost::UDPSocket::UDPSocket (const IPV4Address & bind, tpport_t port)

Create a UDP socket and bind it to a specific interface and port address so that other UDP sockets on remote machines (or the same host) may find and send UDP messages to it.

On failure to bind, an exception is thrown.

Parameters: bind address to bind this socket to.

port number to bind this socket to.

ost::UDPSocket::UDPSocket (const IPV6Address & bind, tpport_t port)

virtual ost::UDPSocket::~UDPSocket () [virtual]

Destroy a UDP socket as a socket.

Member Function Documentation

void ost::UDPSocket::connect (const char * service)

void ost::UDPSocket::connect (const IPV6Host & host, tpport_t port)

Reimplemented in ost::UDPReceive, and ost::UDPDuplex.

void ost::UDPSocket::connect (const IPV4Host & host, tpport_t port)

Reimplemented in ost::UDPTransmit, ost::UDPReceive, and ost::UDPDuplex.

Error ost::UDPSocket::disconnect (void)

Disassociate this socket from any host connection.

No data should be read or written until a connection is established.

Reimplemented in ost::UDPDuplex.

Socket::Error ost::UDPSocket::getInterfaceIndex (const char * ethX, int & InterfaceIndex)

get the interface index for a named network device

Parameters: ethX is device name, like 'eth0' or 'eth1'

InterfaceIndex is the index value returned by os

IPV4Host ost::UDPSocket::getIPV4Peer (tpport_t * port = NULL) const

Examine address of sender of next waiting packet.

This also sets 'peer' address to the sender so that the next 'send' message acts as a 'reply'. This additional behavior overides the standard socket getSender behavior.

Parameters: port pointer to hold port number.

Reimplemented from ost::Socket.

IPV6Host ost::UDPSocket::getIPV6Peer (tpport_t * port = NULL) const

Reimplemented from ost::Socket.

IPV4Host ost::UDPSocket::getPeer (tpport_t * port = NULL) const [inline]

Reimplemented from ost::Socket.

Socket::Error ost::UDPSocket::join (const IPV4Multicast & ia, int InterfaceIndex)

join a multicast group on a particular interface

Parameters: ia is the multicast address to use

InterfaceIndex is the index value returned by getInterfaceIndex

ssize_t ost::UDPSocket::peek (void * buf, size_t len) [inline]

Examine contents of next waiting packet.

Parameters: buf pointer to packet buffer for contents.

len of packet buffer.

Returns: number of bytes examined.

ssize_t ost::UDPSocket::receive (void * buf, size_t len, bool reply = false)

Receive a message from any host.

Parameters: buf pointer to packet buffer to receive.

len of packet buffer to receive.

save sender address as peer to send reply if true.

Returns: number of bytes received.

ssize_t ost::UDPSocket::send (const void * buf, size_t len)

Send a message packet to a peer host.

Parameters: buf pointer to packet buffer to send.

len of packet buffer to send.

Returns: number of bytes sent.

Reimplemented in ost::UDPTransmit.

Error ost::UDPSocket::setLoopback (bool enable) [inline]

Set the loopback.

Error ost::UDPSocket::setMulticast (bool enable) [inline]

Set the multicast.

Reimplemented in ost::UDPTransmit, and ost::UDPReceive.

void ost::UDPSocket::setPeer (const char * service)

Associate socket with a named connection.

void ost::UDPSocket::setPeer (const IPV6Host & host, tpport_t port)

void ost::UDPSocket::setPeer (const IPV4Host & host, tpport_t port)

set the peer address to send message packets to.

This can be set before every send() call if nessisary.

Parameters: host address to send packets to.

port number to deliver packets to.

Error ost::UDPSocket::setTimeToLive (char ttl) [inline]

Set time to live.

Member Data Documentation

Family ost::UDPSocket::family [protected]

struct sockaddr_in ost::UDPSocket::ipv4 [protected]

struct sockaddr_in6 ost::UDPSocket::ipv6 [protected]

union { ... } ost::UDPSocket::peer [protected]

Author

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