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d dd�Zd dd�ZdS ) �_SSLPipea An SSL "Pipe".
An SSL pipe allows you to communicate with an SSL/TLS protocol instance
through memory buffers. It can be used to implement a security layer for an
existing connection where you don't have access to the connection's file
descriptor, or for some reason you don't want to use it.
An SSL pipe can be in "wrapped" and "unwrapped" mode. In unwrapped mode,
data is passed through untransformed. In wrapped mode, application level
data is encrypted to SSL record level data and vice versa. The SSL record
level is the lowest level in the SSL protocol suite and is what travels
as-is over the wire.
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do_handshake(). To shutdown SSL again, call unwrap().
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The *context* argument specifies the ssl.SSLContext to use.
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client side transport.
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�z_SSLPipe.do_handshakec C sj | j tkrtd��| j tkr$td��| j ttfks6t�t| _ || _| �d�\}}|g ksf|dgksft�|S )a1 Start the SSL shutdown sequence.
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will be called when the shutdown is complete. The callback will be
called without arguments.
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� � ||fS )a� Feed SSL record level data into the pipe.
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instance. This can be used to get ssldata for a handshake initiated by
this endpoint.
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buffers containing SSL data that needs to be sent to the remote SSL.
The appdata element is a list of buffers containing plaintext data that
needs to be forwarded to the application. The appdata list may contain
an empty buffer indicating an SSL "close_notify" alert. This alert must
be acknowledged by calling shutdown().
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|tj tjtjfkrڂ |tj k| _W 5 d}~X Y nX | jj�r|�| j�� � |t |�k�s,| jr`�q,q`||fS )a Feed plaintext data into the pipe.
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buffers containing record level data that needs to be sent to the
remote SSL instance. The offset is the number of plaintext bytes that
were processed, which may be less than the length of data.
NOTE: In case of short writes, this call MUST be retried with the SAME
buffer passed into the *data* argument (i.e. the id() must be the
same). This is an OpenSSL requirement. A further particularity is that
a short write will always have offset == 0, because the _ssl module
does not enable partial writes. And even though the offset is zero,
there will still be encrypted data in ssldata.
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N)rN rb �resume_readingr r
r
r re R s z$_SSLProtocolTransport.resume_readingc C s | j j�||� dS )a� Set the high- and low-water limits for write flow control.
These two values control when to call the protocol's
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the low-water limit must be less than or equal to the
high-water limit. Neither value can be negative.
The defaults are implementation-specific. If only the
high-water limit is given, the low-water limit defaults to an
implementation-specific value less than or equal to the
high-water limit. Setting high to zero forces low to zero as
well, and causes pause_writing() to be called whenever the
buffer becomes non-empty. Setting low to zero causes
resume_writing() to be called only once the buffer is empty.
Use of zero for either limit is generally sub-optimal as it
reduces opportunities for doing I/O and computation
concurrently.
N)rN rb �set_write_buffer_limits)r ZhighZlowr
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r rf Z s z-_SSLProtocolTransport.set_write_buffer_limitsc C s | j j�� S )z,Return the current size of the write buffer.)rN rb �get_write_buffer_sizer r
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r rh s s z&_SSLProtocolTransport._protocol_pausedc C s< t |tttf�s$tdt|�j� ���|s,dS | j�|� dS )z�Write some data bytes to the transport.
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