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o �b�& � @ sT d Z ddlmZ ddlmZ ddlmZ ddlmZ eej �G dd� dej��Z dS ) z� The parent class for all the SSH Channels. Currently implemented channels are session, direct-tcp, and forwarded-tcp. Maintainer: Paul Swartz � )� implementer)� interfaces)�Logger)�logc @ s� e Zd ZU dZe� ZdZeed< d0dd�Z de fdd �Z defd d �Z d d � Z dd� Zdd� Zdd� Zdd� Zdd� Zdd� Zdd� Zd d � Zd d � Zd d!� Zd"d#� Zd$d%� Zd&d'� Zd(d)� Zd*d+� Z d,d-� Z d.d/� Z dS )1� SSHChannela� A class that represents a multiplexed channel over an SSH connection. The channel has a local window which is the maximum amount of data it will receive, and a remote which is the maximum amount of data the remote side will accept. There is also a maximum packet size for any individual data packet going each way. @ivar name: the name of the channel. @type name: L{bytes} @ivar localWindowSize: the maximum size of the local window in bytes. @type localWindowSize: L{int} @ivar localWindowLeft: how many bytes are left in the local window. @type localWindowLeft: L{int} @ivar localMaxPacket: the maximum size of packet we will accept in bytes. @type localMaxPacket: L{int} @ivar remoteWindowLeft: how many bytes are left in the remote window. @type remoteWindowLeft: L{int} @ivar remoteMaxPacket: the maximum size of a packet the remote side will accept in bytes. @type remoteMaxPacket: L{int} @ivar conn: the connection this channel is multiplexed through. @type conn: L{SSHConnection} @ivar data: any data to send to the other side when the channel is requested. @type data: L{bytes} @ivar avatar: an avatar for the logged-in user (if a server channel) @ivar localClosed: True if we aren't accepting more data. @type localClosed: L{bool} @ivar remoteClosed: True if the other side isn't accepting more data. @type remoteClosed: L{bool} N�namer c C sn |pd| _ | j | _|p d| _|| _|| _d| _|| _|| _|| _d| _ d| _ g | _ d| _ d| _ d| _d | _d S )Ni i � � � r )�localWindowSize�localWindowLeft�localMaxPacket�remoteWindowLeft�remoteMaxPacket� areWriting�conn�data�avatar� specificData�buf�extBuf�closing� localClosed� remoteClosed�id)�self� localWindowr � remoteWindowr r r r � r �;/usr/lib/python3/dist-packages/twisted/conch/ssh/channel.py�__init__9 s zSSHChannel.__init__�returnc C s | � � �d�S )N�ascii)� __bytes__�decode�r r r r �__str__T s zSSHChannel.__str__c C s | j }|sd}d|| j| jf S )zD Return a byte string representation of the channel s Nones <SSHChannel %b (lw %d rw %d)>)r r r )r r r r r r" W s �zSSHChannel.__bytes__c C sL | j d ur t| j �p d}| jr| j�d�}nd}d|� d|� d| j�� � �S )N�unknownr! �Nonez SSHChannel z (z) on )r �strr r# r � logPrefix)r r r r r r r) e s zSSHChannel.logPrefixc C � | j �d� dS )z� Called when the channel is opened. specificData is any data that the other side sent us when opening the channel. @type specificData: L{bytes} z channel openN��_log�info)r r r r r � channelOpenm s zSSHChannel.channelOpenc C � | j jd|d� dS )z� Called when the open failed for some reason. reason.desc is a string descrption, reason.code the SSH error code. @type reason: L{error.ConchError} z(other side refused open reason: {reason})�reasonN)r, �error)r r0 r r r � openFailedv � zSSHChannel.openFailedc C sv | j | | _ | js| jsd| _| �� | jr!| j}d| _| �|� | jr7| j}g | _|D ] \}}| �||� q,dS dS )z� Called when bytes are added to the remote window. By default it clears the data buffers. @type data: L{bytes} Tr N)r r r � startWritingr �writer � writeExtended)r r �b�typer r r �addWindowBytes s �zSSHChannel.addWindowBytesc C sB |� dd��d�}t| d| d�}|r||�S | jjd|d� dS ) aJ Called when a request is sent to this channel. By default it delegates to self.request_<requestType>. If this function returns true, the request succeeded, otherwise it failed. @type requestType: L{bytes} @type data: L{bytes} @rtype: L{bool} � -� _r! �request_Nz#unhandled request for {requestType})� requestTyper )�replacer# �getattrr, r- )r r= r �foo�fr r r �requestReceived� s zSSHChannel.requestReceivedc C r/ )zL Called when we receive data. @type data: L{bytes} zgot data {data})r N�r, �debug�r r r r r � dataReceived� s zSSHChannel.dataReceivedc C s | j jd||d� dS )z� Called when we receive extended data (usually standard error). @type dataType: L{int} @type data: L{str} z%got extended data {dataType} {data!r})�dataTyper NrC �r rG r r r r � extReceived� s �zSSHChannel.extReceivedc C r* )zD Called when the other side will send no more data. z remote eofNr+ r$ r r r � eofReceived� s zSSHChannel.eofReceivedc C s | j �d� | �� dS )zD Called when the other side has closed the channel. z remote closeN)r, r- �loseConnectionr$ r r r � closeReceived� s zSSHChannel.closeReceivedc C r* )z� Called when the channel is closed. This means that both our side and the remote side have closed the channel. �closedNr+ r$ r r r rM � s zSSHChannel.closedc C s� | j r | j |7 _ dS t|�}|| jkr/|d| j� || jd� }| _ d| _| �� | j}| j}| jj}td||�}|D ] }|| |||| � � q>| j|8 _| j r_| j sa| � � dS dS dS )z� Write some data to the channel. If there is not enough remote window available, buffer until it is. Otherwise, split the data into packets of length remoteMaxPacket and send them. @type data: L{bytes} Nr ) r �lenr r � stopWritingr r �sendData�ranger rK )r r �top�rmpr5 �r�offsetr r r r5 � s( � �zSSHChannel.writec C s | j r#| j d d |kr| j d d |7 < dS | j �||g� dS t|�| jkrD|d| j� ||| jd� gg}| _ d| _| �� t|�| jkrn| j�| ||d| j� � || jd� }| j| j8 _t|�| jksK|r�| j�| ||� | jt|�8 _| j r�| � � dS dS )a Send extended data to this channel. If there is not enough remote window available, buffer until there is. Otherwise, split the data into packets of length remoteMaxPacket and send them. @type dataType: L{int} @type data: L{bytes} ���r r N) r �appendrN r r rO r r �sendExtendedDatar rK rH r r r r6 � s. � �� �zSSHChannel.writeExtendedc C s | � d�|�� dS )z� Part of the Transport interface. Write a list of strings to the channel. @type data: C{list} of L{str} r N)r5 �joinrE r r r � writeSequence r3 zSSHChannel.writeSequencec C s* d| _ | js| js| j�| � dS dS dS )zr Close the channel if there is no buferred data. Otherwise, note the request and return. r N)r r r r � sendCloser$ r r r rK s �zSSHChannel.loseConnectionc C � | j j�� S )z� See: L{ITransport.getPeer} @return: The remote address of this connection. @rtype: L{SSHTransportAddress}. )r � transport�getPeerr$ r r r r^ � zSSHChannel.getPeerc C r\ )z� See: L{ITransport.getHost} @return: An address describing this side of the connection. @rtype: L{SSHTransportAddress}. )r r] �getHostr$ r r r r` % r_ zSSHChannel.getHostc C � dS )z� Called when the remote buffer is full, as a hint to stop writing. This can be ignored, but it can be helpful. Nr r$ r r r rO . � zSSHChannel.stopWritingc C ra )ze Called when the remote buffer has more room, as a hint to continue writing. Nr r$ r r r r4 4 rb zSSHChannel.startWriting)r r r r NNN) �__name__� __module__� __qualname__�__doc__r r, r �bytes�__annotations__r r( r% r" r) r. r2 r9 rB rF rI rJ rL rM r5 r6 rZ rK r^ r` rO r4 r r r r r s@ � r N) rf �zope.interfacer �twisted.internetr �twisted.loggerr �twisted.pythonr � ITransportr r r r r �<module> s
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