Channel Class Reference

SSL aware socket buffers. More...

#include <channel.h>

Public Types
using	recv_buffer_type = std::vector< uint8_t, default_init_allocator< uint8_t > >
using	recv_view_type = std::span< typename recv_buffer_type::value_type >
using	Ssl = mysql_harness::Ssl

Public Member Functions
	Channel ()=default
	Channel (Ssl ssl)
void	clear ()
	clears all buffers. More...
void	init_ssl (SSL_CTX *ssl_ctx)
	initialize the SSL session. More...
stdx::expected< void, std::error_code >	tls_accept ()
	accept a TLS session. More...
stdx::expected< void, std::error_code >	tls_connect ()
	connect a TLS session. More...
bool	tls_init_is_finished ()
stdx::expected< bool, std::error_code >	tls_shutdown ()
template<class DynamicBuffer >
std::enable_if< net::is_dynamic_buffer< DynamicBuffer >::value, stdx::expected< size_t, std::error_code > >::type	write (DynamicBuffer &dyn_buf)
	write unencrypted net::dynamic_buffer to the channel. More...
stdx::expected< size_t, std::error_code >	write (const net::const_buffer &b)
	write unencrypted net::const_buffer to the channel. More...
template<class DynamicBuffer >
stdx::expected< size_t, std::error_code >	read (DynamicBuffer &dyn_buf, size_t sz)
	read unencrypted data from channel to a net::dynamic_buffer. More...
stdx::expected< size_t, std::error_code >	read_to_plain (size_t sz)
stdx::expected< size_t, std::error_code >	write_plain (const net::const_buffer &b)
	write unencrypted data from a net::const_buffer to the channel. More...
stdx::expected< size_t, std::error_code >	read_plain (const net::mutable_buffer &b)
	read plaintext data from recv_plain_buffer() into b. More...
stdx::expected< size_t, std::error_code >	flush_from_recv_buf ()
	flush data from receive buffer to recv_plain_buffer(). More...
stdx::expected< size_t, std::error_code >	flush_to_send_buf ()
	flush data to the send buffer. More...
void	want_recv (size_t wanted)
	bytes wanted. More...
size_t	want_recv () const
	bytes wanted. More...
recv_buffer_type &	recv_buffer ()
	buffer of data that was received from the socket. More...
recv_buffer_type &	send_buffer ()
	buffer of data to be sent to the socket. More...
recv_buffer_type &	send_plain_buffer ()
	unencrypted data to be sent to the socket. More...
const recv_buffer_type &	recv_buffer () const
	buffer of data that was received from the socket. More...
const recv_view_type &	recv_view () const
	network data after a recv(). More...
const recv_buffer_type &	send_buffer () const
	buffer of data to be sent to the socket. More...
const recv_buffer_type &	payload_buffer () const
	payload buffer for More...
recv_buffer_type &	payload_buffer ()
const recv_view_type &	recv_plain_view () const
	decrypted data after a recv(). More...
void	consume_raw (size_t count)
void	consume_plain (size_t count)
void	view_discard_raw ()
void	view_discard_plain ()
void	view_sync_raw ()
void	view_sync_plain ()
void	is_tls (bool v)
	mark channel as containing TLS data in the recv_buffer(). More...
bool	is_tls () const
	check if connection switched to TLS. More...
SSL *	ssl () const
	get access to the raw SSL handle. More...
Ssl	release_ssl ()
	release the internal Ssl structure. More...

Private Attributes
size_t	want_recv_ {}
recv_buffer_type	recv_buffer_
recv_view_type	recv_view_
recv_buffer_type	recv_plain_buffer_
recv_view_type	recv_plain_view_
recv_buffer_type	payload_buffer_
recv_buffer_type	send_plain_buffer_
recv_buffer_type	send_buffer_
bool	is_tls_ {false}
Ssl	ssl_ {}

Detailed Description

SSL aware socket buffers.

manages the raw and plaintext socket buffers of connection which may switch to TLS.

an external user like a socket class can

• receive from a socket and store the socket data into the recv_buffer().
• send to a socket from the send_buffer().

Once init_ssl() is called, the recv_plain() and write_plain() methods transparently decrypt and encrypt.

Member Typedef Documentation

recv_buffer_type

using Channel::recv_buffer_type = std::vector<uint8_t, default_init_allocator<uint8_t> >

recv_view_type

using Channel::recv_view_type = std::span<typename recv_buffer_type::value_type>

Ssl

using Channel::Ssl = mysql_harness::Ssl

Constructor & Destructor Documentation

Channel() [1/2]

Channel::Channel ( )

default

Channel() [2/2]

Channel::Channel ( Ssl  ssl )

inlineexplicit

Member Function Documentation

clear()

void Channel::clear ( )

inline

clears all buffers.

consume_plain()

void Channel::consume_plain

(

size_t

count

)

consume_raw()

void Channel::consume_raw

(

size_t

count

)

flush_from_recv_buf()

stdx::expected< size_t, std::error_code > Channel::flush_from_recv_buf

(

)

flush data from receive buffer to recv_plain_buffer().

if an SSL session is active, flush_to_recv_buf() ensures that data encrypted data gets decrypted and added to the recv_plain_buffer().

In case no SSL session is active, it is a no-op.

flush_to_send_buf()

stdx::expected< size_t, std::error_code > Channel::flush_to_send_buf

(

)

flush data to the send buffer.

if write_plain() was used and an SSL session is active, flush_to_send_buf() ensures that data plaintext data gets encrypted and added to the send_buf().

In case no SSL session is active, it is a no-op.

init_ssl()

void Channel::init_ssl ( SSL_CTX *  ssl_ctx )

inline

initialize the SSL session.

is_tls() [1/2]

bool Channel::is_tls ( ) const

inline

check if connection switched to TLS.

is_tls() [2/2]

void Channel::is_tls ( bool  v )

inline

mark channel as containing TLS data in the recv_buffer().

it is independent of calling init_tls() as the channel may be used to transfer encrypted data as is without ever call init_ssl().

payload_buffer() [1/2]

recv_buffer_type & Channel::payload_buffer ( )

inline

payload_buffer() [2/2]

const recv_buffer_type & Channel::payload_buffer ( ) const

inline

payload buffer for

read()

template<class DynamicBuffer >

stdx::expected< size_t, std::error_code > Channel::read ( DynamicBuffer &  dyn_buf, size_t  sz  )

inline

read unencrypted data from channel to a net::dynamic_buffer.

if the channel has a ssl session in transparently decrypts before the data is appending to the recv_plain_buf()

read_plain()

stdx::expected< size_t, std::error_code > Channel::read_plain

(

const net::mutable_buffer &

b

)

read plaintext data from recv_plain_buffer() into b.

read_to_plain()

stdx::expected< size_t, std::error_code > Channel::read_to_plain

(

size_t

sz

)

recv_buffer() [1/2]

recv_buffer_type & Channel::recv_buffer ( )

inline

buffer of data that was received from the socket.

recv_buffer() [2/2]

const recv_buffer_type & Channel::recv_buffer ( ) const

inline

buffer of data that was received from the socket.

recv_plain_view()

const Channel::recv_view_type & Channel::recv_plain_view

(

)

const

decrypted data after a recv().

recv_view()

const Channel::recv_view_type & Channel::recv_view

(

)

const

network data after a recv().

release_ssl()

Channel::Ssl Channel::release_ssl

(

)

release the internal Ssl structure.

send_buffer() [1/2]

recv_buffer_type & Channel::send_buffer ( )

inline

buffer of data to be sent to the socket.

written into by write(), write_plain(), flush_to_send_buf().

send_buffer() [2/2]

const recv_buffer_type & Channel::send_buffer ( ) const

inline

buffer of data to be sent to the socket.

send_plain_buffer()

Channel::recv_buffer_type & Channel::send_plain_buffer

(

)

unencrypted data to be sent to the socket.

ssl()

SSL * Channel::ssl ( ) const

inline

get access to the raw SSL handle.

can be used to call:

• SSL_get_cipher_name()
• SSL_version()

Return values

nullptr

if channel has no SSL initialized.

tls_accept()

stdx::expected< void, std::error_code > Channel::tls_accept

(

)

accept a TLS session.

expects a Tls::ClientHello in the recv_buf.

tls_connect()

stdx::expected< void, std::error_code > Channel::tls_connect

(

)

connect a TLS session.

tls_init_is_finished()

bool Channel::tls_init_is_finished

(

)

tls_shutdown()

stdx::expected< bool, std::error_code > Channel::tls_shutdown

(

)

Returns

on success, true if shutdown is finished, false if not

on failure, an error-code

view_discard_plain()

void Channel::view_discard_plain

(

)

view_discard_raw()

void Channel::view_discard_raw

(

)

view_sync_plain()

void Channel::view_sync_plain

(

)

view_sync_raw()

void Channel::view_sync_raw

(

)

want_recv() [1/2]

size_t Channel::want_recv ( ) const

inline

bytes wanted.

Returns

bytes wanted to be received at least.

want_recv() [2/2]

void Channel::want_recv ( size_t  wanted )

inline

bytes wanted.

signals to the socket layer how many bytes should be at least read into the buffer.

write() [1/2]

stdx::expected< size_t, std::error_code > Channel::write ( const net::const_buffer &  b )

inline

write unencrypted net::const_buffer to the channel.

if the channel has an ssl session it transparently encrypts before the data is appended to the send_buf()

write() [2/2]

template<class DynamicBuffer >

std::enable_if< net::is_dynamic_buffer< DynamicBuffer >::value, stdx::expected< size_t, std::error_code > >::type Channel::write ( DynamicBuffer &  dyn_buf )

inline

write unencrypted net::dynamic_buffer to the channel.

if the channel has an ssl session it transparently encrypts before the data is appended to the send_buf()

write_plain()

stdx::expected< size_t, std::error_code > Channel::write_plain

(

const net::const_buffer &

b

)

write unencrypted data from a net::const_buffer to the channel.

call flush_to_send_buf() ensure data is written to the send-buffers for the socket.

See also

flush_to_send_buf()

Member Data Documentation

is_tls_

bool Channel::is_tls_ {false}

private

payload_buffer_

recv_buffer_type Channel::payload_buffer_

private

recv_buffer_

recv_buffer_type Channel::recv_buffer_

private

recv_plain_buffer_

recv_buffer_type Channel::recv_plain_buffer_

private

recv_plain_view_

recv_view_type Channel::recv_plain_view_

private

recv_view_

recv_view_type Channel::recv_view_

private

send_buffer_

recv_buffer_type Channel::send_buffer_

private

send_plain_buffer_

recv_buffer_type Channel::send_plain_buffer_

private

ssl_

Ssl Channel::ssl_ {}

private

want_recv_

size_t Channel::want_recv_ {}

private

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

• router/src/routing/include/mysqlrouter/channel.h
• router/src/routing/src/channel.cc