Internet socket class. More...

#include <InternetSocket.h>

Public Types
enum	ShutdownDirection { STOP_SEND = SHUT_WR , STOP_RECEIVE = SHUT_RD , STOP_BOTH = SHUT_RDWR }

Public Member Functions
void	bind (std::string_view localAddress, unsigned short localPort=0)
	bind socket to address / port

void	bind (unsigned short localPort=0)

void	connect (std::string_view foreignAddress, unsigned short foreignPort)
	establish a connection with the given foreign address and port

void	disconnect ()
	Disconnect and unset any foreign addresses.

std::string	getForeignAddress () const

unsigned short	getForeignPort () const

std::string	getLocalAddress () const

unsigned short	getLocalPort () const

int	nativeHandle ()
	return the native handle of the open socket

bool	peerDisconnected () const
	returns whether a peer disconnected

int	receive (void *buffer, size_t len)
	receive data from a bound socket

int	send (const void *buffer, size_t len)
	send data through a connected socket

void	shutdown (ShutdownDirection type)
	shutdown the connection in the specified direction

int	timedConnect (std::string_view foreignAddress, unsigned short foreignPort, int timeout)
	establish a connection with the given foreign address and port

int	timedReceive (void *buffer, size_t len, int timeout)
	receive data from a bound socket, return after the given timespan

Protected Types
enum	SocketDomain { INTERNET = PF_INET , UNIX = PF_LOCAL , CAN = PF_CAN }

enum	SocketType { RAW = SOCK_RAW , STREAM = SOCK_STREAM , DATAGRAM = SOCK_DGRAM }

Protected Member Functions
	InternetSocket (int sockfd)
	create socket from a SocketHandle returned by an accept() call

	InternetSocket (int type, int protocol)
	allows a subclass to create new socket

Static Protected Member Functions
static void	fillAddress (std::string_view address, unsigned short port, sockaddr_in &addr)

Protected Attributes
bool	m_peerDisconnected

int	m_socket

Detailed Description

Internet socket class.

InternetSocket is the base class for all sockets that use address/port to identify communication endpoints. Those are all classes that are used for protocols that build on the IP protocol. (TCP/UDP/etc.). It provides the basic interface for connecting and binding the socket to an address/interface.

Definition at line 18 of file InternetSocket.h.

Member Enumeration Documentation

◆ ShutdownDirection

enum NET::SimpleSocket::ShutdownDirection

inherited

Enumerator
STOP_SEND	disable all variants of send() on the socket, receive calls still work
STOP_RECEIVE	disable all variants of receive() on the socket, send calls still work
STOP_BOTH	disable all send() and receive() calls on the socket

Definition at line 51 of file SimpleSocket.h.

◆ SocketDomain

enum NET::SimpleSocket::SocketDomain

protectedinherited

Enumerator
INTERNET
UNIX
CAN

Definition at line 183 of file SimpleSocket.h.

◆ SocketType

enum NET::SimpleSocket::SocketType

protectedinherited

Enumerator
RAW
STREAM
DATAGRAM

Definition at line 190 of file SimpleSocket.h.

Constructor & Destructor Documentation

◆ InternetSocket() [1/2]

InternetSocket::InternetSocket ( int sockfd )

explicitprotected

create socket from a SocketHandle returned by an accept() call

Definition at line 16 of file InternetSocket.cpp.

◆ InternetSocket() [2/2]

InternetSocket::InternetSocket	(	int	type,
		int	protocol )

protected

allows a subclass to create new socket

Definition at line 12 of file InternetSocket.cpp.

Member Function Documentation

◆ connect()

void InternetSocket::connect	(	std::string_view	foreignAddress,
		unsigned short	foreignPort )

establish a connection with the given foreign address and port

If you are using a connection oriented socket (like TCPSocket), you have to call connect() on that socket in order to send data. However, if you are using a non-connection oriented socket (like UDPSocket), calling connect on that socket will allow you to use the send() function like on a connection oriented socket. If not connected, you would have to use sendTo

Parameters

foreignAddress	foreign address (IP address or name)
foreignPort	foreign port

Exceptions

SocketException thrown if unable to establish connection

Definition at line 19 of file InternetSocket.cpp.

◆ timedConnect()

int InternetSocket::timedConnect	(	std::string_view	foreignAddress,
		unsigned short	foreignPort,
		int	timeout )

establish a connection with the given foreign address and port

Provides timeout for TCP socket connection establishment.

Parameters

foreignAddress	foreign address (IP address or name)
foreignPort	foreign port

Returns: 0 on timeout, 1 when connection is established

Exceptions

SocketException thrown if unable to establish connection

Definition at line 30 of file InternetSocket.cpp.

◆ bind() [1/2]

void InternetSocket::bind ( unsigned short localPort = 0 )

This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. Instead of the richer function with more arguments, this bind() binds to any available interface / address

Definition at line 82 of file InternetSocket.cpp.

◆ bind() [2/2]

void InternetSocket::bind	(	std::string_view	localAddress,
		unsigned short	localPort = 0 )

bind socket to address / port

Set the local port to the specified port and the local address to an interface.

bind() attaches the local endpoint of the socket to the specified interface and port. Typically all servers use bind() to attach to the local port specified by the used protocol. You just need to call bind if you want to restrict the connection to a specific local interface, or if you want to listen on a specific port. If you are just a client using connect() to connect to a server, calling bind is most likely unnecessary.

To bind to a port < 1023 you need eighter superuser access, or the SUID bit set on your program.

Parameters

localAddress	local address
localPort	local port

Exceptions

SocketException thrown if setting local port fails

Definition at line 93 of file InternetSocket.cpp.

◆ getLocalAddress()

std::string InternetSocket::getLocalAddress ( ) const

Get the local address (after binding the socket).

Returns: local address of socket

Exceptions

SocketException thrown if fetch fails

Definition at line 102 of file InternetSocket.cpp.

◆ getLocalPort()

unsigned short InternetSocket::getLocalPort ( ) const

Get the local port (after binding the socket).

Returns: local port of socket

Exceptions

SocketException thrown if fetch fails

Definition at line 113 of file InternetSocket.cpp.

◆ getForeignAddress()

std::string InternetSocket::getForeignAddress ( ) const

Get the foreign address. Call connect() before using this function.

Returns: foreign address

Exceptions

SocketException thrown if unable to fetch foreign address

Definition at line 124 of file InternetSocket.cpp.

◆ getForeignPort()

unsigned short InternetSocket::getForeignPort ( ) const

Get the foreign port. Call connect() before using this function.

Returns: foreign port

Exceptions

SocketException thrown if unable to fetch foreign port

Definition at line 135 of file InternetSocket.cpp.

◆ fillAddress()

void InternetSocket::fillAddress	(	std::string_view	address,
		unsigned short	port,
		sockaddr_in &	addr )

staticprotected

Fill an address structure with the given address and port number. If the given address is not a valid IPv4 address, it will be resolved by hostname or DNS lookup. addr will be unchanged if this resolve fails.

Parameters

address	IPv4 domain name or address
port	IP port number to fill in
addr	address structure to fill

Exceptions

SocketException thrown if unable to resolve a hostname

Definition at line 146 of file InternetSocket.cpp.

◆ nativeHandle()

int NET::SimpleSocket::nativeHandle ( )

inlineinherited

return the native handle of the open socket

Definition at line 61 of file SimpleSocket.h.

◆ send()

int SimpleSocket::send	(	const void *	buffer,
		size_t	len )

inherited

send data through a connected socket

send() can only be used on a socket that called connect() before. If you try to use send() on a not connected socket, SocketException will be thrown.

If you are using a stream oriented socket (like TCPSocket), the operating system is allowed to send only a part of the packet you told it to send, so send() will return the number of bytes actually sent. It is your responsibility to resend the data not sent by send()

If you are using a datagram oriented socket (like UDPSocket or SCTPSocket) the operating system will only send and receive complete datagrams, but send() will fail if you are trying to send too much data. In that case SocketException will be thrown.

Parameters

buffer	data to be send
len	length of the data to be sent

Returns: number of bytes sent

Exceptions

SocketException if sending went wrong

Definition at line 44 of file SimpleSocket.cpp.

◆ receive()

int SimpleSocket::receive	(	void *	buffer,
		size_t	len )

inherited

receive data from a bound socket

receive() can only be used on a socket that called bind() or connect() before. If you try to use receive() on a not bound socket, SocketException will be thrown.

If using a stream oriented Socket, receive can return a part of a received messge, e.g. if you send 100 bytes, it's possible you will receive 50 bytes two times in a row. However, the order of the sent data will be preserved.

If you are using a datagram oriented sockets, you will only receive whole datagrams. But beware of using a too small buffer. If the receive buffer is too small for the received datagram, the data you didn't read in the receive call will be discared.

If the remote host has closed the connection (on a connection based socket like TCP or SCTP) receive() will return 0. If you are using a connectionless protocol (like UDP) there is no way to determine wheter the connection has been closed by the remote host or not.

Parameters

buffer	the buffer the received data will be written to
len	length of the provided buffer, receive will not read more than that

Returns: number of bytes received

Exceptions

SocketException in case an error occured

Definition at line 62 of file SimpleSocket.cpp.

◆ timedReceive()

int SimpleSocket::timedReceive	(	void *	buffer,
		size_t	len,
		int	timeout )

inherited

receive data from a bound socket, return after the given timespan

timedReceive() can only be used on a socket that called bind() or connect before. If you try to use receive() on a not bound socket, SocketException will be thrown.

If using a stream oriented Socket, receive can return a part of a received messge, e.g. if you send 100 bytes, it's possible you will receive 50 bytes two times in a row. However, the order of the sent data will be preserved.

If you are using a datagram oriented sockets, you will only receive whole datagrams. But beware of using a too small buffer. If the receive buffer is too small for the received datagram, the data you didn't read in the receive call will be discared.

If the remote host has closed the connection (on a connection based socket like TCP or SCTP) receive() will return 0. If you are using a connectionless protocol (like UDP) there is no way to determine wheter the connection has been closed by the remote host or not.

Parameters

buffer	the buffer the received data will be written to
len	length of the provided buffer, receive will not read more than that
timeout	the timeout in ms after which receive will give up and return

Returns: number of bytes received, 0 on timeout

Exceptions

SocketException in case an error occured

Definition at line 69 of file SimpleSocket.cpp.

◆ disconnect()

void SimpleSocket::disconnect ( )

inherited

Disconnect and unset any foreign addresses.

This will ungracefully abort the connection by sending an RST frame. disconnect() should not be used under normal circumstances, as it will terminate the connection OOB, preventing the other end of the communication from retrieving data that would still be available in the OS buffer.

For normal termination of a connection use shutdown().

Exceptions

SocketException thrown if unable to disconnect

Definition at line 93 of file SimpleSocket.cpp.

◆ shutdown()

void SimpleSocket::shutdown ( ShutdownDirection type )

inherited

shutdown the connection in the specified direction

This will gracefully end a connection by sending a FIN frame. Use this to end a normal communication cycle. To abort a connection see disconnect().

Depending on the specified ShutdownDirection, calls for that direction will stop working. Use this function if you want to have more control than just destroing the socket. It allows you to cut the connection in one direction, or both.

If you use shutdown() on an unconnected socket, the corresponding calls will simply stop working.

Parameters

type	the ShutdownDirection that be used

Exceptions

SocketException in case an error occured

Definition at line 108 of file SimpleSocket.cpp.

◆ peerDisconnected()

bool SimpleSocket::peerDisconnected ( ) const

inherited

returns whether a peer disconnected

Will only work if you use a connection oriented, connected socket. Returns true if the peer disconnected. Use this function after a call to receive, returned 0 received bytes.

Returns: true if a peer disconnected

Definition at line 114 of file SimpleSocket.cpp.

Member Data Documentation

◆ m_socket

int NET::SimpleSocket::m_socket

protectedinherited

Definition at line 204 of file SimpleSocket.h.

◆ m_peerDisconnected

bool NET::SimpleSocket::m_peerDisconnected

protectedinherited

Definition at line 205 of file SimpleSocket.h.

The documentation for this class was generated from the following files:

Public Types

Public Member Functions

Protected Types

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

◆ ShutdownDirection

◆ SocketDomain

◆ SocketType

Constructor & Destructor Documentation

◆ InternetSocket() [1/2]

◆ InternetSocket() [2/2]

Member Function Documentation

◆ connect()

◆ timedConnect()

◆ bind() [1/2]

◆ bind() [2/2]

◆ getLocalAddress()

◆ getLocalPort()

◆ getForeignAddress()

◆ getForeignPort()

◆ fillAddress()

◆ nativeHandle()

◆ send()

◆ receive()

◆ timedReceive()

◆ disconnect()

◆ shutdown()

◆ peerDisconnected()

Member Data Documentation

◆ m_socket

◆ m_peerDisconnected