Plain UDP sockets. More...

#include <inetserverdgram.hpp>

Inheritance diagram for libsocket::inet_dgram_server:

[legend]

Public Member Functions
	inet_dgram_server (const char host, const char port, int proto_osi3, int flags=0)
	Create datagram socket and bind it. More...

	inet_dgram_server (const string &host, const string &port, int proto_osi3, int flags=0)
	Create datagram socket and bind it. More...

ssize_t	sndto (const void buf, size_t len, const char dsthost, const char *dstport, int sndto_flags=0)
	Send data to UDP peer. More...

ssize_t	sndto (const void *buf, size_t len, const string &dsthost, const string &dstport, int sndto_flags=0)
	Send data to UDP peer; C++ string host and port. More...

ssize_t	sndto (const string &buf, const string &dsthost, const string &dstport, int sndto_flags=0)
	Send data to UDP peer; using C++ strings only. More...

ssize_t	rcvfrom (void buf, size_t len, char srchost, size_t hostlen, char *srcport, size_t portlen, int rcvfrom_flags=0, bool numeric=false)
	Receives data from peer. More...

ssize_t	rcvfrom (void *buf, size_t len, string &srchost, string &srcport, int rcvfrom_flags=0, bool numeric=false)
	rcvfrom for C++ strings More...

ssize_t	rcvfrom (string &buf, string &srchost, string &srcport, int rcvfrom_flags=0, bool numeric=false)
	rcvfrom for C++ strings, implemented consistently More...

const string &	gethost (void) const

const string &	getport (void) const

virtual int	destroy (void)
	Destroys a socket. More...

int	getfd (void) const
	Returns the socket file descriptor. More...

int	set_sock_opt (int level, int optname, const char *optval, socklen_t optlen) const
	Set socket options on the underlying socket. More...

void	set_close_on_destructor (bool cod)

Protected Attributes
string	host
	The address we're bound or connected to. More...

string	port
	The port we're bound or connected to. More...

int	proto
	Which internet protocol version we're using. More...

int	sfd
	sfd is the sockets API file descriptor More...

bool	is_nonblocking

bool	close_on_destructor

Private Member Functions
void	setup (const char host, const char port, int proto_osi3, int flags=0)
	Set up socket. NOT FOR EXTERNAL USE More...

void	setup (const string &host, const string &port, int proto_osi3, int flags=0)
	Set up socket. NOT FOR EXTERNAL USE More...

Detailed Description

Plain UDP sockets.

Although called ..._server, this class may also be used as client (UDP is symmetric). It has some special features, e.g. it's not possible to connect it.

Definition at line 49 of file inetserverdgram.hpp.

Constructor & Destructor Documentation

◆ inet_dgram_server() [1/2]

libsocket::inet_dgram_server::inet_dgram_server	(	const char *	host,
		const char *	port,
		int	proto_osi3,
		int	flags = `0`
	)

Create datagram socket and bind it.

Parameters

host	Bind address (Wildcard: "0.0.0.0"/"::")
port	Bind port
proto_osi3	`LIBSOCKET_IPv4` or `LIBSOCKET_IPv6` or `LIBSOCKET_BOTH`
flags	Flags for `socket(2)`

Definition at line 60 of file inetserverdgram.cpp.

Here is the call graph for this function:

◆ inet_dgram_server() [2/2]

libsocket::inet_dgram_server::inet_dgram_server	(	const string &	host,
		const string &	port,
		int	proto_osi3,
		int	flags = `0`
	)

Create datagram socket and bind it.

Parameters

host	Bind address (Wildcard: "0.0.0.0"/"::")
port	Bind port
proto_osi3	`LIBSOCKET_IPv4` or `LIBSOCKET_IPv6` or `LIBSOCKET_BOTH`
flags	Flags for `socket(2)`

Definition at line 73 of file inetserverdgram.cpp.

Here is the call graph for this function:

Member Function Documentation

◆ setup() [1/2]

void libsocket::inet_dgram_server::setup	(	const char *	bhost,
		const char *	bport,
		int	proto_osi3,
		int	flags = `0`
	)

private

Set up socket. NOT FOR EXTERNAL USE

Parameters

bhost	Bind address (Wildcard: "0.0.0.0"/"::")
bport	Bind port
proto_osi3	`LIBSOCKET_IPv4` or `LIBSOCKET_IPv6` or `LIBSOCKET_BOTH`
flags	Flags for `socket(2)`

Definition at line 86 of file inetserverdgram.cpp.

Here is the call graph for this function:

Here is the caller graph for this function:

◆ setup() [2/2]

void libsocket::inet_dgram_server::setup	(	const string &	bhost,
		const string &	bport,
		int	proto_osi3,
		int	flags = `0`
	)

private

Set up socket. NOT FOR EXTERNAL USE

Parameters

bhost	Bind address (Wildcard: "0.0.0.0"/"::")
bport	Bind port
proto_osi3	`LIBSOCKET_IPv4` or `LIBSOCKET_IPv6` or `LIBSOCKET_BOTH`
flags	Flags for `socket(2)`

Definition at line 109 of file inetserverdgram.cpp.

Here is the call graph for this function:

◆ sndto() [1/3]

ssize_t libsocket::inet_dgram::sndto	(	const void *	buf,
		size_t	len,
		const char *	dsthost,
		const char *	dstport,
		int	sndto_flags = `0`
	)

inherited

Send data to UDP peer.

This is the counterpart to system's sendto(2). It sends data to a UDP peer.

Parameters

buf	The data to be sent
len	Length of transmission
dsthost	Target host
dstport	Target port
sndto_flags	Flags for `sendto(2)`

Return values

>0	n bytes of data were sent.
0	Nothing was sent
-1	Socket is non-blocking and didn't send any data.

Every error makes the function throw an exception.

Definition at line 207 of file inetdgram.cpp.

Here is the call graph for this function:

Here is the caller graph for this function:

◆ sndto() [2/3]

ssize_t libsocket::inet_dgram::sndto	(	const void *	buf,
		size_t	len,
		const string &	dsthost,
		const string &	dstport,
		int	sndto_flags = `0`
	)

inherited

Send data to UDP peer; C++ string host and port.

This is the counterpart to system's sendto(2). It sends data to a UDP peer.

Parameters

buf	The data to be sent
len	Length of transmission
dsthost	Target host
dstport	Target port
sndto_flags	Flags for `sendto(2)`

Every error makes the function throw an exception, except for EWOULDBLOCK.

Return values

-1	Socket is non-blocking and didn't send any data.

Definition at line 243 of file inetdgram.cpp.

Here is the call graph for this function:

◆ sndto() [3/3]

ssize_t libsocket::inet_dgram::sndto	(	const string &	buf,
		const string &	dsthost,
		const string &	dstport,
		int	sndto_flags = `0`
	)

inherited

Send data to UDP peer; using C++ strings only.

This is the counterpart to system's sendto(2). It sends data to a UDP peer.

Parameters

buf	The data to be sent
dsthost	Target host
dstport	Target port
sndto_flags	Flags for `sendto(2)`

Every error makes the function throw an exception.

Return values

-1	Socket is non-blocking and didn't send any data.

Definition at line 266 of file inetdgram.cpp.

Here is the call graph for this function:

◆ rcvfrom() [1/3]

ssize_t libsocket::inet_dgram::rcvfrom	(	void *	buf,
		size_t	len,
		char *	hostbuf,
		size_t	hostbuflen,
		char *	portbuf,
		size_t	portbuflen,
		int	rcvfrom_flags = `0`,
		bool	numeric = `false`
	)

inherited

Receives data from peer.

rcvfrom is the equivalent to recvfrom(2).

Parameters

buf	Target memory
len	The size of the target memory
hostbuf	Buffer to write the peer's hostname to
hostbuflen	Its length
portbuf	Like `hostbuf`, but for the remote port
portbuflen	`portbuf`'s length
rcvfrom_flags	Flags to be passed to `recvfrom(2)`
numeric	If this is `true`, host and port are saved numerically (25 instead of "smtp")

Return values

>0	n bytes of data were read into `buf`.
0	Peer sent EOF
-1	Socket is non-blocking and returned without any data.

Every error makes the function throw an exception.

Definition at line 79 of file inetdgram.cpp.

Here is the call graph for this function:

Here is the caller graph for this function:

◆ rcvfrom() [2/3]

ssize_t libsocket::inet_dgram::rcvfrom	(	void *	buf,
		size_t	len,
		string &	srchost,
		string &	srcport,
		int	rcvfrom_flags = `0`,
		bool	numeric = `false`
	)

inherited

rcvfrom for C++ strings

Works like rcvfrom(), but takes C++ strings instead of pointers.

Parameters

buf	Buffer to copy the received data to
len	The buffer's length
srchost	String to place the remote host's name to
srcport	Like `srchost` but for the remote port
rcvfrom_flags	Flags to be passed to `recvfrom(2)`
numeric	If remote host and port should be saved numerically

Return values

>0	n bytes of data were read into `buf`.
0	Peer sent EOF
-1	Socket is non-blocking and returned without any data.

Every error makes the function throw an exception.

Definition at line 122 of file inetdgram.cpp.

Here is the call graph for this function:

◆ rcvfrom() [3/3]

ssize_t libsocket::inet_dgram::rcvfrom	(	string &	buf,
		string &	srchost,
		string &	srcport,
		int	rcvfrom_flags = `0`,
		bool	numeric = `false`
	)

inherited

rcvfrom for C++ strings, implemented consistently

Works like every other rcvfrom() library call, but places the received memory to the C++ string buf.

Parameters

buf	The string where the received data should be stored at. Its length determines how much data will be stored; the library will not resize `buf`.
srchost	String to place the remote host's name to
srcport	Like `srchost` but for the remote port
rcvfrom_flags	Flags to be passed to `recvfrom(2)`
numeric	If remote host and port should be saved numerically

Return values

>0	n bytes of data were read into `buf`.
0	Peer sent EOF
-1	Socket is non-blocking and returned without any data.

Every error makes the function throw an exception.

Definition at line 167 of file inetdgram.cpp.

Here is the call graph for this function:

◆ gethost()

const string & libsocket::inet_socket::gethost ( void ) const

inherited

For sockets behaving as client: Returns the remote host. For sockets behaving as server: Returns the address bound to.

Definition at line 59 of file inetbase.cpp.

◆ getport()

const string & libsocket::inet_socket::getport ( void ) const

inherited

For sockets behaving as client: Returns the remote port. For sockets behaving as server: Returns the port bound to.

Definition at line 65 of file inetbase.cpp.

◆ destroy()

int libsocket::socket::destroy ( void )

virtualinherited

Destroys a socket.

Return values

0	Fine!
<0	Most likely the socket was already closed before.

Definition at line 72 of file socket.cpp.

Here is the caller graph for this function:

◆ getfd()

int libsocket::socket::getfd ( void ) const

inherited

Returns the socket file descriptor.

Returns: The socket file descriptor of the class.

getfd() is a getter you may use to obtain the file descriptor for raw operations on it. It's relatively uncritical as libsocket just wraps other syscalls and doesn't manipulate it using unusual ways.

Definition at line 91 of file socket.cpp.

◆ set_sock_opt()

int libsocket::socket::set_sock_opt	(	int	level,
		int	optname,
		const char *	optval,
		socklen_t	optlen
	)		const

inherited

Set socket options on the underlying socket.

Returns: The return value of setsockopt(2).

Sets socket options using setsockopt(2). See setsockopt(2), tcp(7), udp(7), unix(7) for documentation on how to use this function.

Definition at line 101 of file socket.cpp.

◆ set_close_on_destructor()

void libsocket::socket::set_close_on_destructor ( bool cod )

inlineinherited

close_on_destructor is true by default. If set to false, do not call close(2) on the underlying socket in the destructor.

Definition at line 95 of file socket.hpp.

Member Data Documentation

◆ host

string libsocket::inet_socket::host

protectedinherited

The address we're bound or connected to.

Definition at line 55 of file inetbase.hpp.

◆ port

string libsocket::inet_socket::port

protectedinherited

The port we're bound or connected to.

Definition at line 57 of file inetbase.hpp.

◆ proto

int libsocket::inet_socket::proto

protectedinherited

Which internet protocol version we're using.

Definition at line 59 of file inetbase.hpp.

◆ sfd

int libsocket::socket::sfd

protectedinherited

sfd is the sockets API file descriptor

Definition at line 74 of file socket.hpp.

◆ close_on_destructor

bool libsocket::socket::close_on_destructor

protectedinherited

Default is true; if set to false, the file descriptor is not closed when the destructor is called.

Definition at line 78 of file socket.hpp.

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

headers/inetserverdgram.hpp
C++/inetserverdgram.cpp

Public Member Functions

Protected Attributes

Private Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ inet_dgram_server() [1/2]

◆ inet_dgram_server() [2/2]

Member Function Documentation

◆ setup() [1/2]

◆ setup() [2/2]

◆ sndto() [1/3]

◆ sndto() [2/3]

◆ sndto() [3/3]

◆ rcvfrom() [1/3]

◆ rcvfrom() [2/3]

◆ rcvfrom() [3/3]

◆ gethost()

◆ getport()

◆ destroy()

◆ getfd()

◆ set_sock_opt()

◆ set_close_on_destructor()

Member Data Documentation

◆ host

◆ port

◆ proto

◆ sfd

◆ close_on_destructor