twisted.conch.ssh.connection.SSHConnection(service.SSHService)
class documentationtwisted.conch.ssh.connection
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Known subclasses: twisted.conch.endpoints._ConnectionReady, twisted.conch.scripts.cftp.SSHConnection, twisted.conch.scripts.conch.SSHConnection, twisted.conch.scripts.tkconch.SSHConnection
An implementation of the 'ssh-connection' service. It is used to multiplex multiple channels over the single SSH connection.
Instance Variable | localChannelID | the next number to use as a local channel ID. (type: int ) |
Instance Variable | channels | a dict
mapping a local channel ID to SSHChannel subclasses. (type: dict ) |
Instance Variable | localToRemoteChannel | a dict
mapping a local channel ID to a remote channel ID. (type: dict ) |
Instance Variable | channelsToRemoteChannel | a dict
mapping a SSHChannel subclass to remote channel ID. (type: dict ) |
Instance Variable | deferreds | a dict
mapping a local channel ID to a list of Deferreds
for outstanding channel requests. Also, the 'global' key stores the
list of pending global request Deferred s. |
Method | __init__ | Undocumented |
Method | serviceStarted | called when the service is active on the transport. |
Method | serviceStopped | Called when the connection is stopped. |
Method | ssh_GLOBAL_REQUEST | No summary |
Method | ssh_REQUEST_SUCCESS | Our global request succeeded. Get the appropriate Deferred and call it back with the packet we received. |
Method | ssh_REQUEST_FAILURE | Our global request failed. Get the appropriate Deferred and errback it with the packet we received. |
Method | ssh_CHANNEL_OPEN | No summary |
Method | ssh_CHANNEL_OPEN_CONFIRMATION | No summary |
Method | ssh_CHANNEL_OPEN_FAILURE | No summary |
Method | ssh_CHANNEL_WINDOW_ADJUST | The other side is adding bytes to its window. Payload:: uint32 local channel number uint32 bytes to add |
Method | ssh_CHANNEL_DATA | The other side is sending us data. Payload:: uint32 local channel number string data |
Method | ssh_CHANNEL_EXTENDED_DATA | No summary |
Method | ssh_CHANNEL_EOF | The other side is not sending any more data. Payload:: uint32 local channel number |
Method | ssh_CHANNEL_CLOSE | The other side is closing its end; it does not want to receive any more data. Payload:: uint32 local channel number |
Method | ssh_CHANNEL_REQUEST | No summary |
Method | ssh_CHANNEL_SUCCESS | Our channel request to the other side succeeded. Payload:: uint32 local channel number |
Method | ssh_CHANNEL_FAILURE | Our channel request to the other side failed. Payload:: uint32 local channel number |
Method | sendGlobalRequest | Send a global request for this connection. Current this is only used for remote->local TCP forwarding. |
Method | openChannel | Open a new channel on this connection. |
Method | sendRequest | Send a request to a channel. |
Method | adjustWindow | Tell the other side that we will receive more data. This should not normally need to be called as it is managed automatically. |
Method | sendData | Send data to a channel. This should not normally be used: instead use channel.write(data) as it manages the window automatically. |
Method | sendExtendedData | Send extended data to a channel. This should not normally be used: instead use channel.writeExtendedData(data, dataType) as it manages the window automatically. |
Method | sendEOF | Send an EOF (End of File) for a channel. |
Method | sendClose | Close a channel. |
Method | getChannel | No summary |
Method | gotGlobalRequest | No summary |
Method | channelClosed | No summary |
Method | _cleanupGlobalDeferreds | All pending requests that have returned a deferred must be errbacked when this service is stopped, otherwise they might be left uncalled and uncallable. |
Method | _cbChannelRequest | Called back if the other side wanted a reply to a channel request. If
the result is true, send a MSG_CHANNEL_SUCCESS. Otherwise, raise a
error.ConchError |
Method | _ebChannelRequest | Called if the other wisde wanted a reply to the channel requeset and the channel request failed. |
Inherited from SSHService:
Method | logPrefix | Override this method to insert custom logging behavior. Its return value will be inserted in front of every line. It may be called more times than the number of output lines. |
Method | packetReceived | called when we receive a packet on the transport |
dict
mapping a local channel ID to a list
of Deferreds
for outstanding channel requests. Also, the 'global' key stores the
list
of pending global request Deferred
s.
called when the service is active on the transport.
Called when the connection is stopped.
All pending requests that have returned a deferred must be errbacked when this service is stopped, otherwise they might be left uncalled and uncallable.
The other side has made a global request. Payload:
string request type bool want reply <request specific data>
This dispatches to self.gotGlobalRequest.
Our global request succeeded. Get the appropriate Deferred and call it back with the packet we received.
Our global request failed. Get the appropriate Deferred and errback it with the packet we received.
The other side wants to get a channel. Payload:
string channel name uint32 remote channel number uint32 remote window size uint32 remote maximum packet size <channel specific data>
We get a channel from self.getChannel(), give it a local channel number and notify the other side. Then notify the channel by calling its channelOpen method.
The other side accepted our MSG_CHANNEL_OPEN request. Payload:
uint32 local channel number uint32 remote channel number uint32 remote window size uint32 remote maximum packet size <channel specific data>
Find the channel using the local channel number and notify its channelOpen method.
The other side did not accept our MSG_CHANNEL_OPEN request. Payload:
uint32 local channel number uint32 reason code string reason description
Find the channel using the local channel number and notify it by calling its openFailed() method.
The other side is adding bytes to its window. Payload:
uint32 local channel number uint32 bytes to add
Call the channel's addWindowBytes() method to add new bytes to the remote window.
The other side is sending us data. Payload:
uint32 local channel number string data
Check to make sure the other side hasn't sent too much data (more than what's in the window, or more than the maximum packet size). If they have, close the channel. Otherwise, decrease the available window and pass the data to the channel's dataReceived().
The other side is sending us exteneded data. Payload:
uint32 local channel number uint32 type code string data
Check to make sure the other side hasn't sent too much data (more than what's in the window, or than the maximum packet size). If they have, close the channel. Otherwise, decrease the available window and pass the data and type code to the channel's extReceived().
The other side is not sending any more data. Payload:
uint32 local channel number
Notify the channel by calling its eofReceived() method.
The other side is closing its end; it does not want to receive any more data. Payload:
uint32 local channel number
Notify the channnel by calling its closeReceived() method. If the channel has also sent a close message, call self.channelClosed().
The other side is sending a request to a channel. Payload:
uint32 local channel number string request name bool want reply <request specific data>
Pass the message to the channel's requestReceived method. If the other side wants a reply, add callbacks which will send the reply.
Called back if the other side wanted a reply to a channel request. If
the result is true, send a MSG_CHANNEL_SUCCESS. Otherwise, raise a
error.ConchError
Parameters | result | the value returned from the channel's requestReceived() method. If it's
False, the request failed. (type: bool ) |
localChannel | the local channel ID of the channel to which the request was made. (type: int ) | |
Raises | ConchError | if the result is False. |
Called if the other wisde wanted a reply to the channel requeset and the channel request failed.
Parameters | result | a Failure, but it's not used. |
localChannel | the local channel ID of the channel to which the request was made. (type: int ) |
Our channel request to the other side succeeded. Payload:
uint32 local channel number
Get the Deferred
out of self.deferreds and call it
back.
Our channel request to the other side failed. Payload:
uint32 local channel number
Get the Deferred
out of self.deferreds and errback it with
a error.ConchError
.
Send a global request for this connection. Current this is only used for remote->local TCP forwarding.
Send a request to a channel.
Tell the other side that we will receive more data. This should not normally need to be called as it is managed automatically.
Send data to a channel. This should not normally be used: instead use channel.write(data) as it manages the window automatically.
Send extended data to a channel. This should not normally be used: instead use channel.writeExtendedData(data, dataType) as it manages the window automatically.
The other side requested a channel of some sort. channelType is the type of channel being requested, windowSize is the initial size of the remote window, maxPacket is the largest packet we should send, data is any other packet data (often nothing).
We return a subclass of SSHChannel
.
By default, this dispatches to a method 'channel_channelType' with any non-alphanumerics in the channelType replace with _'s. If it cannot find a suitable method, it returns an OPEN_UNKNOWN_CHANNEL_TYPE error. The method is called with arguments of windowSize, maxPacket, data.
Returns | (type: subclass of SSHChannel /tuple ) |
We got a global request. pretty much, this is just used by the client to request that we forward a port from the server to the client. Returns either:
By default, this dispatches to a method 'global_requestType' with -'s in requestType replaced with _'s. The found method is passed data. If this method cannot be found, this method returns 0. Otherwise, it returns the return value of that method.
Returns | (type: int /tuple ) |
Called when a channel is closed. It clears the local state related to
the channel, and calls channel.closed(). MAKE SURE YOU CALL THIS METHOD,
even if you subclass SSHConnection
.
If you don't, things will break mysteriously.