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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""
The parent class for all the SSH services. Currently implemented services
are ssh-userauth and ssh-connection.
Maintainer: Paul Swartz
"""
from typing import Dict
from twisted.logger import Logger
class SSHService:
# this is the ssh name for the service:
name: bytes = None # type:ignore[assignment]
protocolMessages: Dict[int, str] = {} # map #'s -> protocol names
transport = None # gets set later
_log = Logger()
def serviceStarted(self):
"""
called when the service is active on the transport.
"""
def serviceStopped(self):
"""
called when the service is stopped, either by the connection ending
or by another service being started
"""
def logPrefix(self):
return "SSHService {!r} on {}".format(
self.name, self.transport.transport.logPrefix()
)
def packetReceived(self, messageNum, packet):
"""
called when we receive a packet on the transport
"""
# print self.protocolMessages
if messageNum in self.protocolMessages:
messageType = self.protocolMessages[messageNum]
f = getattr(self, "ssh_%s" % messageType[4:], None)
if f is not None:
return f(packet)
self._log.info(
"couldn't handle {messageNum} {packet!r}",
messageNum=messageNum,
packet=packet,
)
self.transport.sendUnimplemented()