mirror of
https://github.com/GNS3/gns3-server
synced 2024-11-24 09:18:08 +00:00
History support for console and telnet application, Fixes: #1083
Arrows UP/DOWN for telnet, Ref. #1083 Typo, Ref. #1083 Support async commands, Ref. #1083 Small refactor, Ref. #1083 Asyncio telnet server - connections support, Ref. #10831 Prompt-toolkit in dependencies, ref. #1083 Few comments, ref. #1083 Direct imports, ref. #1083 Windows size changed support in telnet server, ref. #1139 Fake termios Fake termios - different approach InputStream - copied source from prompt_toolkit
This commit is contained in:
ziajka
parent
bb90c0ba52
commit
ac508435c3
@ -30,6 +30,7 @@ import gns3server.utils.get_resource
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import os
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import sys
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import types
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# To avoid strange bug later we switch the event loop before any other operation
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if sys.platform.startswith("win"):
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@ -38,6 +39,9 @@ if sys.platform.startswith("win"):
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loop = asyncio.ProactorEventLoop()
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asyncio.set_event_loop(loop)
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if sys.platform.startswith("win"):
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sys.modules['termios'] = types.ModuleType('termios')
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def daemonize():
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"""
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@ -20,7 +20,18 @@ import sys
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import asyncio
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import inspect
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from .telnet_server import AsyncioTelnetServer
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from prompt_toolkit import prompt
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from prompt_toolkit.history import InMemoryHistory
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from prompt_toolkit.contrib.completers import WordCompleter
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from prompt_toolkit.enums import DEFAULT_BUFFER
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from prompt_toolkit.eventloop.base import EventLoop
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from prompt_toolkit.interface import CommandLineInterface
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from prompt_toolkit.layout.screen import Size
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from prompt_toolkit.shortcuts import create_prompt_application, create_asyncio_eventloop
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from prompt_toolkit.terminal.vt100_output import Vt100_Output
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from .telnet_server import AsyncioTelnetServer, TelnetConnection
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from .input_stream import InputStream
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class EmbedShell:
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@ -60,6 +71,14 @@ class EmbedShell:
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def prompt(self, val):
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self._prompt = val
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@property
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def welcome_message(self):
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return self._welcome_message
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@welcome_message.setter
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def welcome_message(self, welcome_message):
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self._welcome_message = welcome_message
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@asyncio.coroutine
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def help(self, *args):
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"""
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@ -90,6 +109,11 @@ class EmbedShell:
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found = False
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if cmd[0] == '?':
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cmd[0] = 'help'
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# when there is no command specified just return empty result
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if not cmd[0].strip():
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return ""
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for (name, meth) in inspect.getmembers(self):
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if name == cmd[0]:
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cmd.pop(0)
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@ -97,7 +121,7 @@ class EmbedShell:
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found = True
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break
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if not found:
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res = ('Command not found {}'.format(cmd[0]) + (yield from self.help()))
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res = ('Command not found {}\n'.format(cmd[0]) + (yield from self.help()))
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return res
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@asyncio.coroutine
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@ -111,29 +135,140 @@ class EmbedShell:
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res = yield from self._parse_command(result)
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self._writer.feed_data(res.encode())
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def get_commands(self):
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"""
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Returns commands available to execute
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:return: list of (name, doc) tuples
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"""
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commands = []
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for name, value in inspect.getmembers(self):
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if not inspect.isgeneratorfunction(value):
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continue
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if name.startswith('_') or name == 'run':
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continue
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doc = inspect.getdoc(value)
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commands.append((name, doc))
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return commands
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class UnstoppableEventLoop(EventLoop):
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"""
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Partially fake event loop which cannot be stopped by CommandLineInterface
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"""
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def __init__(self, loop):
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self._loop = loop
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def close(self):
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" Ignore. "
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def stop(self):
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" Ignore. "
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def run_in_executor(self, *args, **kwargs):
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return self._loop.run_in_executor(*args, **kwargs)
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def call_from_executor(self, callback, **kwargs):
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self._loop.call_from_executor(callback, **kwargs)
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def add_reader(self, fd, callback):
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raise NotImplementedError
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def remove_reader(self, fd):
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raise NotImplementedError
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class ShellConnection(TelnetConnection):
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def __init__(self, reader, writer, shell, loop):
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super(ShellConnection, self).__init__(reader, writer)
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self._shell = shell
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self._loop = loop
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self._cli = None
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self._cb = None
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self._size = Size(rows=40, columns=79)
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self.encoding = 'utf-8'
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@asyncio.coroutine
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def connected(self):
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def get_size():
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return self._size
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self._cli = CommandLineInterface(
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application=create_prompt_application(self._shell.prompt),
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eventloop=UnstoppableEventLoop(create_asyncio_eventloop(self._loop)),
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output=Vt100_Output(self, get_size))
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self._cb = self._cli.create_eventloop_callbacks()
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self._inputstream = InputStream(self._cb.feed_key)
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# Taken from prompt_toolkit telnet server
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# https://github.com/jonathanslenders/python-prompt-toolkit/blob/99fa7fae61c9b4ed9767ead3b4f9b1318cfa875d/prompt_toolkit/contrib/telnet/server.py#L165
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self._cli._is_running = True
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if self._shell.welcome_message is not None:
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self.send(self._shell.welcome_message.encode())
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self._cli._redraw()
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@asyncio.coroutine
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def disconnected(self):
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pass
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def window_size_changed(self, columns, rows):
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self._size = Size(rows=rows, columns=columns)
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self._cb.terminal_size_changed()
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@asyncio.coroutine
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def feed(self, data):
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data = data.decode()
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self._inputstream.feed(data)
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self._cli._redraw()
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# Prompt toolkit has returned the command
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if self._cli.is_returning:
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try:
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returned_value = self._cli.return_value()
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except (EOFError, KeyboardInterrupt) as e:
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# don't close terminal, just keep it alive
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self.close()
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return
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command = returned_value.text
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res = yield from self._shell._parse_command(command)
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self.send(res.encode())
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self.reset()
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def reset(self):
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""" Resets terminal screen"""
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self._cli.reset()
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self._cli.buffers[DEFAULT_BUFFER].reset()
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self._cli.renderer.request_absolute_cursor_position()
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self._cli._redraw()
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def write(self, data):
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""" Compat with CLI"""
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self.send(data)
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def flush(self):
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""" Compat with CLI"""
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pass
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def create_telnet_shell(shell, loop=None):
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"""
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Run a shell application with a telnet frontend
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:param application: An EmbedShell instance
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:param loop: The event loop
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:returns: Telnet server
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"""
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class Stream(asyncio.StreamReader):
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def write(self, data):
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self.feed_data(data)
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@asyncio.coroutine
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def drain(self):
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pass
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shell.reader = Stream()
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shell.writer = Stream()
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if loop is None:
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loop = asyncio.get_event_loop()
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loop.create_task(shell.run())
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return AsyncioTelnetServer(reader=shell.writer, writer=shell.reader, binary=False, echo=False)
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def factory(reader, writer):
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return ShellConnection(reader, writer, shell, loop)
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return AsyncioTelnetServer(binary=True, echo=True, naws=True, connection_factory=factory)
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def create_stdin_shell(shell, loop=None):
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@ -145,9 +280,13 @@ def create_stdin_shell(shell, loop=None):
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:returns: Telnet server
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"""
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@asyncio.coroutine
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def feed_stdin(loop, reader):
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def feed_stdin(loop, reader, shell):
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history = InMemoryHistory()
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completer = WordCompleter([name for name, _ in shell.get_commands()], ignore_case=True)
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while True:
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line = yield from loop.run_in_executor(None, sys.stdin.readline)
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line = yield from prompt(
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">", patch_stdout=True, return_asyncio_coroutine=True, history=history, completer=completer)
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line += '\n'
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reader.feed_data(line.encode())
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@asyncio.coroutine
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@ -164,7 +303,7 @@ def create_stdin_shell(shell, loop=None):
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if loop is None:
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loop = asyncio.get_event_loop()
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reader_task = loop.create_task(feed_stdin(loop, reader))
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reader_task = loop.create_task(feed_stdin(loop, reader, shell))
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writer_task = loop.create_task(read_stdout(writer))
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shell_task = loop.create_task(shell.run())
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return asyncio.gather(shell_task, writer_task, reader_task)
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@ -181,20 +320,26 @@ if __name__ == '__main__':
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This command accept arguments: hello tutu will display tutu
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"""
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if len(args):
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return ' '.join(args)
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else:
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return 'world\n'
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@asyncio.coroutine
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def world():
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yield from asyncio.sleep(2)
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if len(args):
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return ' '.join(args)
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else:
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return 'world\n'
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return (yield from world())
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# Demo using telnet
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# server = create_telnet_shell(Demo())
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# coro = asyncio.start_server(server.run, '127.0.0.1', 4444, loop=loop)
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# s = loop.run_until_complete(coro)
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# try:
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# loop.run_forever()
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# except KeyboardInterrupt:
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# pass
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shell = Demo(welcome_message="Welcome!\n")
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server = create_telnet_shell(shell, loop=loop)
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coro = asyncio.start_server(server.run, '127.0.0.1', 4444, loop=loop)
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s = loop.run_until_complete(coro)
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try:
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loop.run_forever()
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except KeyboardInterrupt:
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pass
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# Demo using stdin
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loop.run_until_complete(create_stdin_shell(Demo()))
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loop.close()
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# loop.run_until_complete(create_stdin_shell(Demo()))
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# loop.close()
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419
gns3server/utils/asyncio/input_stream.py
Normal file
419
gns3server/utils/asyncio/input_stream.py
Normal file
@ -0,0 +1,419 @@
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"""
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Parser for VT100 input stream.
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"""
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# Copied from prompt_toolkit/terminal/vt100_input.py due to dependency on termios (which is not available on Windows)
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from __future__ import unicode_literals
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import re
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import six
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from six.moves import range
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from prompt_toolkit.keys import Keys
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from prompt_toolkit.key_binding.input_processor import KeyPress
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__all__ = (
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'InputStream',
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'raw_mode',
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'cooked_mode',
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)
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_DEBUG_RENDERER_INPUT = False
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_DEBUG_RENDERER_INPUT_FILENAME = 'prompt-toolkit-render-input.log'
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# Regex matching any CPR response
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# (Note that we use '\Z' instead of '$', because '$' could include a trailing
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# newline.)
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_cpr_response_re = re.compile('^' + re.escape('\x1b[') + r'\d+;\d+R\Z')
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# Mouse events:
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# Typical: "Esc[MaB*" Urxvt: "Esc[96;14;13M" and for Xterm SGR: "Esc[<64;85;12M"
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_mouse_event_re = re.compile('^' + re.escape('\x1b[') + r'(<?[\d;]+[mM]|M...)\Z')
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# Regex matching any valid prefix of a CPR response.
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# (Note that it doesn't contain the last character, the 'R'. The prefix has to
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# be shorter.)
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_cpr_response_prefix_re = re.compile('^' + re.escape('\x1b[') + r'[\d;]*\Z')
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_mouse_event_prefix_re = re.compile('^' + re.escape('\x1b[') + r'(<?[\d;]*|M.{0,2})\Z')
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class _Flush(object):
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""" Helper object to indicate flush operation to the parser. """
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pass
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# Mapping of vt100 escape codes to Keys.
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ANSI_SEQUENCES = {
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'\x1b': Keys.Escape,
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'\x00': Keys.ControlSpace, # Control-Space (Also for Ctrl-@)
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'\x01': Keys.ControlA, # Control-A (home)
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'\x02': Keys.ControlB, # Control-B (emacs cursor left)
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'\x03': Keys.ControlC, # Control-C (interrupt)
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'\x04': Keys.ControlD, # Control-D (exit)
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'\x05': Keys.ControlE, # Contrel-E (end)
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'\x06': Keys.ControlF, # Control-F (cursor forward)
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'\x07': Keys.ControlG, # Control-G
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'\x08': Keys.ControlH, # Control-H (8) (Identical to '\b')
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'\x09': Keys.ControlI, # Control-I (9) (Identical to '\t')
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'\x0a': Keys.ControlJ, # Control-J (10) (Identical to '\n')
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'\x0b': Keys.ControlK, # Control-K (delete until end of line; vertical tab)
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'\x0c': Keys.ControlL, # Control-L (clear; form feed)
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'\x0d': Keys.ControlM, # Control-M (13) (Identical to '\r')
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'\x0e': Keys.ControlN, # Control-N (14) (history forward)
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'\x0f': Keys.ControlO, # Control-O (15)
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'\x10': Keys.ControlP, # Control-P (16) (history back)
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'\x11': Keys.ControlQ, # Control-Q
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'\x12': Keys.ControlR, # Control-R (18) (reverse search)
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'\x13': Keys.ControlS, # Control-S (19) (forward search)
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'\x14': Keys.ControlT, # Control-T
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'\x15': Keys.ControlU, # Control-U
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'\x16': Keys.ControlV, # Control-V
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'\x17': Keys.ControlW, # Control-W
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'\x18': Keys.ControlX, # Control-X
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'\x19': Keys.ControlY, # Control-Y (25)
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'\x1a': Keys.ControlZ, # Control-Z
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'\x1c': Keys.ControlBackslash, # Both Control-\ and Ctrl-|
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'\x1d': Keys.ControlSquareClose, # Control-]
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'\x1e': Keys.ControlCircumflex, # Control-^
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'\x1f': Keys.ControlUnderscore, # Control-underscore (Also for Ctrl-hypen.)
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'\x7f': Keys.Backspace, # (127) Backspace
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'\x1b[A': Keys.Up,
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'\x1b[B': Keys.Down,
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'\x1b[C': Keys.Right,
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'\x1b[D': Keys.Left,
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'\x1b[H': Keys.Home,
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'\x1bOH': Keys.Home,
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'\x1b[F': Keys.End,
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'\x1bOF': Keys.End,
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'\x1b[3~': Keys.Delete,
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'\x1b[3;2~': Keys.ShiftDelete, # xterm, gnome-terminal.
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'\x1b[3;5~': Keys.ControlDelete, # xterm, gnome-terminal.
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'\x1b[1~': Keys.Home, # tmux
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'\x1b[4~': Keys.End, # tmux
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'\x1b[5~': Keys.PageUp,
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'\x1b[6~': Keys.PageDown,
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'\x1b[7~': Keys.Home, # xrvt
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'\x1b[8~': Keys.End, # xrvt
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'\x1b[Z': Keys.BackTab, # shift + tab
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'\x1b[2~': Keys.Insert,
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'\x1bOP': Keys.F1,
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'\x1bOQ': Keys.F2,
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'\x1bOR': Keys.F3,
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'\x1bOS': Keys.F4,
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'\x1b[[A': Keys.F1, # Linux console.
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'\x1b[[B': Keys.F2, # Linux console.
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'\x1b[[C': Keys.F3, # Linux console.
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'\x1b[[D': Keys.F4, # Linux console.
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'\x1b[[E': Keys.F5, # Linux console.
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'\x1b[11~': Keys.F1, # rxvt-unicode
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'\x1b[12~': Keys.F2, # rxvt-unicode
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'\x1b[13~': Keys.F3, # rxvt-unicode
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'\x1b[14~': Keys.F4, # rxvt-unicode
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'\x1b[15~': Keys.F5,
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'\x1b[17~': Keys.F6,
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'\x1b[18~': Keys.F7,
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'\x1b[19~': Keys.F8,
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'\x1b[20~': Keys.F9,
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'\x1b[21~': Keys.F10,
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'\x1b[23~': Keys.F11,
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'\x1b[24~': Keys.F12,
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'\x1b[25~': Keys.F13,
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'\x1b[26~': Keys.F14,
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'\x1b[28~': Keys.F15,
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'\x1b[29~': Keys.F16,
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'\x1b[31~': Keys.F17,
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'\x1b[32~': Keys.F18,
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'\x1b[33~': Keys.F19,
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'\x1b[34~': Keys.F20,
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# Xterm
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'\x1b[1;2P': Keys.F13,
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'\x1b[1;2Q': Keys.F14,
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# '\x1b[1;2R': Keys.F15, # Conflicts with CPR response.
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'\x1b[1;2S': Keys.F16,
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'\x1b[15;2~': Keys.F17,
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'\x1b[17;2~': Keys.F18,
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'\x1b[18;2~': Keys.F19,
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'\x1b[19;2~': Keys.F20,
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'\x1b[20;2~': Keys.F21,
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'\x1b[21;2~': Keys.F22,
|
||||
'\x1b[23;2~': Keys.F23,
|
||||
'\x1b[24;2~': Keys.F24,
|
||||
|
||||
'\x1b[1;5A': Keys.ControlUp, # Cursor Mode
|
||||
'\x1b[1;5B': Keys.ControlDown, # Cursor Mode
|
||||
'\x1b[1;5C': Keys.ControlRight, # Cursor Mode
|
||||
'\x1b[1;5D': Keys.ControlLeft, # Cursor Mode
|
||||
|
||||
'\x1b[1;2A': Keys.ShiftUp,
|
||||
'\x1b[1;2B': Keys.ShiftDown,
|
||||
'\x1b[1;2C': Keys.ShiftRight,
|
||||
'\x1b[1;2D': Keys.ShiftLeft,
|
||||
|
||||
# Tmux sends following keystrokes when control+arrow is pressed, but for
|
||||
# Emacs ansi-term sends the same sequences for normal arrow keys. Consider
|
||||
# it a normal arrow press, because that's more important.
|
||||
'\x1bOA': Keys.Up,
|
||||
'\x1bOB': Keys.Down,
|
||||
'\x1bOC': Keys.Right,
|
||||
'\x1bOD': Keys.Left,
|
||||
|
||||
'\x1b[5A': Keys.ControlUp,
|
||||
'\x1b[5B': Keys.ControlDown,
|
||||
'\x1b[5C': Keys.ControlRight,
|
||||
'\x1b[5D': Keys.ControlLeft,
|
||||
|
||||
'\x1bOc': Keys.ControlRight, # rxvt
|
||||
'\x1bOd': Keys.ControlLeft, # rxvt
|
||||
|
||||
'\x1b[200~': Keys.BracketedPaste, # Start of bracketed paste.
|
||||
|
||||
# Meta + arrow keys. Several terminals handle this differently.
|
||||
# The following sequences are for xterm and gnome-terminal.
|
||||
# (Iterm sends ESC followed by the normal arrow_up/down/left/right
|
||||
# sequences, and the OSX Terminal sends ESCb and ESCf for "alt
|
||||
# arrow_left" and "alt arrow_right." We don't handle these
|
||||
# explicitely, in here, because would could not distinguesh between
|
||||
# pressing ESC (to go to Vi navigation mode), followed by just the
|
||||
# 'b' or 'f' key. These combinations are handled in
|
||||
# the input processor.)
|
||||
'\x1b[1;3D': (Keys.Escape, Keys.Left),
|
||||
'\x1b[1;3C': (Keys.Escape, Keys.Right),
|
||||
'\x1b[1;3A': (Keys.Escape, Keys.Up),
|
||||
'\x1b[1;3B': (Keys.Escape, Keys.Down),
|
||||
|
||||
# Sequences generated by numpad 5. Not sure what it means. (It doesn't
|
||||
# appear in 'infocmp'. Just ignore.
|
||||
'\x1b[E': Keys.Ignore, # Xterm.
|
||||
'\x1b[G': Keys.Ignore, # Linux console.
|
||||
}
|
||||
|
||||
|
||||
class _IsPrefixOfLongerMatchCache(dict):
|
||||
"""
|
||||
Dictiory that maps input sequences to a boolean indicating whether there is
|
||||
any key that start with this characters.
|
||||
"""
|
||||
def __missing__(self, prefix):
|
||||
# (hard coded) If this could be a prefix of a CPR response, return
|
||||
# True.
|
||||
if (_cpr_response_prefix_re.match(prefix) or _mouse_event_prefix_re.match(prefix)):
|
||||
result = True
|
||||
else:
|
||||
# If this could be a prefix of anything else, also return True.
|
||||
result = any(v for k, v in ANSI_SEQUENCES.items() if k.startswith(prefix) and k != prefix)
|
||||
|
||||
self[prefix] = result
|
||||
return result
|
||||
|
||||
|
||||
_IS_PREFIX_OF_LONGER_MATCH_CACHE = _IsPrefixOfLongerMatchCache()
|
||||
|
||||
|
||||
class InputStream(object):
|
||||
"""
|
||||
Parser for VT100 input stream.
|
||||
|
||||
Feed the data through the `feed` method and the correct callbacks of the
|
||||
`input_processor` will be called.
|
||||
|
||||
::
|
||||
|
||||
def callback(key):
|
||||
pass
|
||||
i = InputStream(callback)
|
||||
i.feed('data\x01...')
|
||||
|
||||
:attr input_processor: :class:`~prompt_toolkit.key_binding.InputProcessor` instance.
|
||||
"""
|
||||
# Lookup table of ANSI escape sequences for a VT100 terminal
|
||||
# Hint: in order to know what sequences your terminal writes to stdin, run
|
||||
# "od -c" and start typing.
|
||||
def __init__(self, feed_key_callback):
|
||||
assert callable(feed_key_callback)
|
||||
|
||||
self.feed_key_callback = feed_key_callback
|
||||
self.reset()
|
||||
|
||||
if _DEBUG_RENDERER_INPUT:
|
||||
self.LOG = open(_DEBUG_RENDERER_INPUT_FILENAME, 'ab')
|
||||
|
||||
def reset(self, request=False):
|
||||
self._in_bracketed_paste = False
|
||||
self._start_parser()
|
||||
|
||||
def _start_parser(self):
|
||||
"""
|
||||
Start the parser coroutine.
|
||||
"""
|
||||
self._input_parser = self._input_parser_generator()
|
||||
self._input_parser.send(None)
|
||||
|
||||
def _get_match(self, prefix):
|
||||
"""
|
||||
Return the key that maps to this prefix.
|
||||
"""
|
||||
# (hard coded) If we match a CPR response, return Keys.CPRResponse.
|
||||
# (This one doesn't fit in the ANSI_SEQUENCES, because it contains
|
||||
# integer variables.)
|
||||
if _cpr_response_re.match(prefix):
|
||||
return Keys.CPRResponse
|
||||
|
||||
elif _mouse_event_re.match(prefix):
|
||||
return Keys.Vt100MouseEvent
|
||||
|
||||
# Otherwise, use the mappings.
|
||||
try:
|
||||
return ANSI_SEQUENCES[prefix]
|
||||
except KeyError:
|
||||
return None
|
||||
|
||||
def _input_parser_generator(self):
|
||||
"""
|
||||
Coroutine (state machine) for the input parser.
|
||||
"""
|
||||
prefix = ''
|
||||
retry = False
|
||||
flush = False
|
||||
|
||||
while True:
|
||||
flush = False
|
||||
|
||||
if retry:
|
||||
retry = False
|
||||
else:
|
||||
# Get next character.
|
||||
c = yield
|
||||
|
||||
if c == _Flush:
|
||||
flush = True
|
||||
else:
|
||||
prefix += c
|
||||
|
||||
# If we have some data, check for matches.
|
||||
if prefix:
|
||||
is_prefix_of_longer_match = _IS_PREFIX_OF_LONGER_MATCH_CACHE[prefix]
|
||||
match = self._get_match(prefix)
|
||||
|
||||
# Exact matches found, call handlers..
|
||||
if (flush or not is_prefix_of_longer_match) and match:
|
||||
self._call_handler(match, prefix)
|
||||
prefix = ''
|
||||
|
||||
# No exact match found.
|
||||
elif (flush or not is_prefix_of_longer_match) and not match:
|
||||
found = False
|
||||
retry = True
|
||||
|
||||
# Loop over the input, try the longest match first and
|
||||
# shift.
|
||||
for i in range(len(prefix), 0, -1):
|
||||
match= self._get_match(prefix[:i])
|
||||
if match:
|
||||
self._call_handler(match, prefix[:i])
|
||||
prefix = prefix[i:]
|
||||
found = True
|
||||
|
||||
if not found:
|
||||
self._call_handler(prefix[0], prefix[0])
|
||||
prefix = prefix[1:]
|
||||
|
||||
def _call_handler(self, key, insert_text):
|
||||
"""
|
||||
Callback to handler.
|
||||
"""
|
||||
if isinstance(key, tuple):
|
||||
for k in key:
|
||||
self._call_handler(k, insert_text)
|
||||
else:
|
||||
if key == Keys.BracketedPaste:
|
||||
self._in_bracketed_paste = True
|
||||
self._paste_buffer = ''
|
||||
else:
|
||||
self.feed_key_callback(KeyPress(key, insert_text))
|
||||
|
||||
def feed(self, data):
|
||||
"""
|
||||
Feed the input stream.
|
||||
|
||||
:param data: Input string (unicode).
|
||||
"""
|
||||
assert isinstance(data, six.text_type)
|
||||
|
||||
if _DEBUG_RENDERER_INPUT:
|
||||
self.LOG.write(repr(data).encode('utf-8') + b'\n')
|
||||
self.LOG.flush()
|
||||
|
||||
# Handle bracketed paste. (We bypass the parser that matches all other
|
||||
# key presses and keep reading input until we see the end mark.)
|
||||
# This is much faster then parsing character by character.
|
||||
if self._in_bracketed_paste:
|
||||
self._paste_buffer += data
|
||||
end_mark = '\x1b[201~'
|
||||
|
||||
if end_mark in self._paste_buffer:
|
||||
end_index = self._paste_buffer.index(end_mark)
|
||||
|
||||
# Feed content to key bindings.
|
||||
paste_content = self._paste_buffer[:end_index]
|
||||
self.feed_key_callback(KeyPress(Keys.BracketedPaste, paste_content))
|
||||
|
||||
# Quit bracketed paste mode and handle remaining input.
|
||||
self._in_bracketed_paste = False
|
||||
remaining = self._paste_buffer[end_index + len(end_mark):]
|
||||
self._paste_buffer = ''
|
||||
|
||||
self.feed(remaining)
|
||||
|
||||
# Handle normal input character by character.
|
||||
else:
|
||||
for i, c in enumerate(data):
|
||||
if self._in_bracketed_paste:
|
||||
# Quit loop and process from this position when the parser
|
||||
# entered bracketed paste.
|
||||
self.feed(data[i:])
|
||||
break
|
||||
else:
|
||||
# Replace \r by \n. (Some clients send \r instead of \n
|
||||
# when enter is pressed. E.g. telnet and some other
|
||||
# terminals.)
|
||||
|
||||
# XXX: We should remove this in a future version. It *is*
|
||||
# now possible to recognise the difference.
|
||||
# (We remove ICRNL/INLCR/IGNCR below.)
|
||||
# However, this breaks IPython and maybe other applications,
|
||||
# because they bind ControlJ (\n) for handling the Enter key.
|
||||
|
||||
# When this is removed, replace Enter=ControlJ by
|
||||
# Enter=ControlM in keys.py.
|
||||
if c == '\r':
|
||||
c = '\n'
|
||||
self._input_parser.send(c)
|
||||
|
||||
def flush(self):
|
||||
"""
|
||||
Flush the buffer of the input stream.
|
||||
|
||||
This will allow us to handle the escape key (or maybe meta) sooner.
|
||||
The input received by the escape key is actually the same as the first
|
||||
characters of e.g. Arrow-Up, so without knowing what follows the escape
|
||||
sequence, we don't know whether escape has been pressed, or whether
|
||||
it's something else. This flush function should be called after a
|
||||
timeout, and processes everything that's still in the buffer as-is, so
|
||||
without assuming any characters will folow.
|
||||
"""
|
||||
self._input_parser.send(_Flush)
|
||||
|
||||
def feed_and_flush(self, data):
|
||||
"""
|
||||
Wrapper around ``feed`` and ``flush``.
|
||||
"""
|
||||
self.feed(data)
|
||||
self.flush()
|
||||
@ -18,6 +18,7 @@
|
||||
import re
|
||||
import asyncio
|
||||
import asyncio.subprocess
|
||||
import struct
|
||||
|
||||
import logging
|
||||
log = logging.getLogger(__name__)
|
||||
@ -57,12 +58,73 @@ LINEMO = 34 # Line Mode
|
||||
READ_SIZE = 1024
|
||||
|
||||
|
||||
class AsyncioTelnetServer:
|
||||
|
||||
def __init__(self, reader=None, writer=None, binary=True, echo=False):
|
||||
class TelnetConnection(object):
|
||||
"""Default implementation of telnet connection which may but may not be used."""
|
||||
def __init__(self, reader, writer):
|
||||
self.is_closing = False
|
||||
self._reader = reader
|
||||
self._writer = writer
|
||||
self._clients = set()
|
||||
|
||||
@property
|
||||
def reader(self):
|
||||
return self._reader
|
||||
|
||||
@property
|
||||
def writer(self):
|
||||
return self._writer
|
||||
|
||||
@asyncio.coroutine
|
||||
def connected(self):
|
||||
"""Method called when client is connected"""
|
||||
pass
|
||||
|
||||
@asyncio.coroutine
|
||||
def disconnected(self):
|
||||
"""Method called when client is disconnecting"""
|
||||
pass
|
||||
|
||||
def window_size_changed(self, columns, rows):
|
||||
"""Method called when window size changed, only can occur when
|
||||
`naws` flag is enable in server configuration."""
|
||||
pass
|
||||
|
||||
def feed(self, data):
|
||||
"""
|
||||
Handles incoming data
|
||||
:return:
|
||||
"""
|
||||
|
||||
def send(self, data):
|
||||
"""
|
||||
Sending data back to client
|
||||
:return:
|
||||
"""
|
||||
data = data.decode().replace("\n", "\r\n")
|
||||
self.writer.write(data.encode())
|
||||
|
||||
def close(self):
|
||||
"""
|
||||
Closes current connection
|
||||
:return:
|
||||
"""
|
||||
self.is_closing = True
|
||||
|
||||
|
||||
class AsyncioTelnetServer:
|
||||
MAX_NEGOTIATION_READ = 10
|
||||
|
||||
def __init__(self, reader=None, writer=None, binary=True, echo=False, naws=False, connection_factory=None):
|
||||
"""
|
||||
Initializes telnet server
|
||||
:param naws when True make a window size negotiation
|
||||
:param connection_factory: when set it's possible to inject own implementation of connection
|
||||
"""
|
||||
assert connection_factory is None or (connection_factory is not None and reader is None and writer is None), \
|
||||
"Please use either reader and writer either connection_factory, otherwise duplicate data may be produced."
|
||||
|
||||
self._reader = reader
|
||||
self._writer = writer
|
||||
self._connections = dict()
|
||||
self._lock = asyncio.Lock()
|
||||
self._reader_process = None
|
||||
self._current_read = None
|
||||
@ -72,6 +134,15 @@ class AsyncioTelnetServer:
|
||||
# the data is echo on his terminal by telnet otherwise
|
||||
# it's our job (or the wrapped app) to send back the data
|
||||
self._echo = echo
|
||||
self._naws = naws
|
||||
|
||||
def default_connection_factory(reader, writer):
|
||||
return TelnetConnection(reader, writer)
|
||||
|
||||
if connection_factory is None:
|
||||
connection_factory = default_connection_factory
|
||||
|
||||
self._connection_factory = connection_factory
|
||||
|
||||
@staticmethod
|
||||
@asyncio.coroutine
|
||||
@ -86,7 +157,7 @@ class AsyncioTelnetServer:
|
||||
yield from writer.drain()
|
||||
|
||||
@asyncio.coroutine
|
||||
def _write_intro(self, writer, binary=False, echo=False):
|
||||
def _write_intro(self, writer, binary=False, echo=False, naws=False):
|
||||
# Send initial telnet session opening
|
||||
if echo:
|
||||
writer.write(bytes([IAC, WILL, ECHO]))
|
||||
@ -106,17 +177,23 @@ class AsyncioTelnetServer:
|
||||
IAC, DONT, SGA,
|
||||
IAC, WONT, BINARY,
|
||||
IAC, DONT, BINARY]))
|
||||
|
||||
if naws:
|
||||
writer.write(bytes([
|
||||
IAC, DO, NAWS
|
||||
]))
|
||||
yield from writer.drain()
|
||||
|
||||
@asyncio.coroutine
|
||||
def run(self, network_reader, network_writer):
|
||||
# Keep track of connected clients
|
||||
self._clients.add(network_writer)
|
||||
connection = self._connection_factory(network_reader, network_writer)
|
||||
self._connections[network_writer] = connection
|
||||
|
||||
try:
|
||||
yield from self._write_intro(network_writer, echo=self._echo, binary=self._binary)
|
||||
|
||||
yield from self._process(network_reader, network_writer)
|
||||
yield from self._write_intro(network_writer, echo=self._echo, binary=self._binary, naws=self._naws)
|
||||
yield from connection.connected()
|
||||
yield from self._process(network_reader, network_writer, connection)
|
||||
except ConnectionResetError:
|
||||
with (yield from self._lock):
|
||||
|
||||
@ -125,8 +202,15 @@ class AsyncioTelnetServer:
|
||||
if self._reader_process == network_reader:
|
||||
self._reader_process = None
|
||||
# Cancel current read from this reader
|
||||
self._current_read.cancel()
|
||||
self._clients.remove(network_writer)
|
||||
if self._current_read is not None:
|
||||
self._current_read.cancel()
|
||||
|
||||
yield from connection.disconnected()
|
||||
del self._connections[network_writer]
|
||||
|
||||
@asyncio.coroutine
|
||||
def client_connected_hook(self):
|
||||
pass
|
||||
|
||||
@asyncio.coroutine
|
||||
def _get_reader(self, network_reader):
|
||||
@ -136,13 +220,14 @@ class AsyncioTelnetServer:
|
||||
with (yield from self._lock):
|
||||
if self._reader_process is None:
|
||||
self._reader_process = network_reader
|
||||
if self._reader_process == network_reader:
|
||||
self._current_read = asyncio.async(self._reader.read(READ_SIZE))
|
||||
return self._current_read
|
||||
if self._reader:
|
||||
if self._reader_process == network_reader:
|
||||
self._current_read = asyncio.async(self._reader.read(READ_SIZE))
|
||||
return self._current_read
|
||||
return None
|
||||
|
||||
@asyncio.coroutine
|
||||
def _process(self, network_reader, network_writer):
|
||||
def _process(self, network_reader, network_writer, connection):
|
||||
network_read = asyncio.async(network_reader.read(READ_SIZE))
|
||||
reader_read = yield from self._get_reader(network_reader)
|
||||
|
||||
@ -172,7 +257,8 @@ class AsyncioTelnetServer:
|
||||
network_read = asyncio.async(network_reader.read(READ_SIZE))
|
||||
|
||||
if IAC in data:
|
||||
data = yield from self._IAC_parser(data, network_reader, network_writer)
|
||||
data = yield from self._IAC_parser(data, network_reader, network_writer, connection)
|
||||
|
||||
if len(data) == 0:
|
||||
continue
|
||||
|
||||
@ -182,18 +268,49 @@ class AsyncioTelnetServer:
|
||||
if self._writer:
|
||||
self._writer.write(data)
|
||||
yield from self._writer.drain()
|
||||
|
||||
yield from connection.feed(data)
|
||||
if connection.is_closing:
|
||||
raise ConnectionResetError()
|
||||
|
||||
elif coro == reader_read:
|
||||
if self._reader.at_eof():
|
||||
if self._reader and self._reader.at_eof():
|
||||
raise ConnectionResetError()
|
||||
|
||||
reader_read = yield from self._get_reader(network_reader)
|
||||
|
||||
# Replicate the output on all clients
|
||||
for writer in self._clients:
|
||||
writer.write(data)
|
||||
yield from writer.drain()
|
||||
for connection in self._connections.values():
|
||||
connection.writer.write(data)
|
||||
yield from connection.writer.drain()
|
||||
|
||||
def _IAC_parser(self, buf, network_reader, network_writer):
|
||||
@asyncio.coroutine
|
||||
def _read(self, cmd, buffer, location, reader):
|
||||
""" Reads next op from the buffer or reader"""
|
||||
try:
|
||||
op = buffer[location]
|
||||
cmd.append(op)
|
||||
return op
|
||||
except IndexError:
|
||||
op = yield from reader.read(1)
|
||||
buffer.extend(op)
|
||||
cmd.append(buffer[location])
|
||||
return op
|
||||
|
||||
def _negotiate(self, data, connection):
|
||||
""" Performs negotiation commands"""
|
||||
|
||||
command, payload = data[0], data[1:]
|
||||
if command == NAWS:
|
||||
if len(payload) == 4:
|
||||
columns, rows = struct.unpack(str('!HH'), bytes(payload))
|
||||
connection.window_size_changed(columns, rows)
|
||||
else:
|
||||
log.warning('Wrong number of NAWS bytes')
|
||||
else:
|
||||
log.debug("Not supported negotiation sequence, received {} bytes", len(data))
|
||||
|
||||
def _IAC_parser(self, buf, network_reader, network_writer, connection):
|
||||
"""
|
||||
Processes and removes any Telnet commands from the buffer.
|
||||
|
||||
@ -201,6 +318,7 @@ class AsyncioTelnetServer:
|
||||
:returns: buffer minus Telnet commands
|
||||
"""
|
||||
|
||||
|
||||
skip_to = 0
|
||||
while True:
|
||||
# Locate an IAC to process
|
||||
@ -218,7 +336,7 @@ class AsyncioTelnetServer:
|
||||
iac_cmd.append(buf[iac_loc + 1])
|
||||
|
||||
# Is this just a 2-byte TELNET command?
|
||||
if iac_cmd[1] not in [WILL, WONT, DO, DONT]:
|
||||
if iac_cmd[1] not in [WILL, WONT, DO, DONT, SB]:
|
||||
if iac_cmd[1] == AYT:
|
||||
log.debug("Telnet server received Are-You-There (AYT)")
|
||||
network_writer.write(b'\r\nYour Are-You-There received. I am here.\r\n')
|
||||
@ -234,6 +352,17 @@ class AsyncioTelnetServer:
|
||||
else:
|
||||
log.debug("Unhandled telnet command: "
|
||||
"{0:#x} {1:#x}".format(*iac_cmd))
|
||||
elif iac_cmd[1] == SB: # starts negotiation commands
|
||||
negotiation = []
|
||||
for pos in range(2, self.MAX_NEGOTIATION_READ):
|
||||
op = yield from self._read(iac_cmd, buf, iac_loc + pos, network_reader)
|
||||
negotiation.append(op)
|
||||
if op == SE:
|
||||
# ends negotiation commands
|
||||
break
|
||||
|
||||
# SE command is followed by IAC, remove the last two operations from stack
|
||||
self._negotiate(negotiation[0:-2], connection)
|
||||
|
||||
# This must be a 3-byte TELNET command
|
||||
else:
|
||||
@ -260,7 +389,7 @@ class AsyncioTelnetServer:
|
||||
log.debug("Unhandled DONT telnet command: "
|
||||
"{0:#x} {1:#x} {2:#x}".format(*iac_cmd))
|
||||
elif iac_cmd[1] == WILL:
|
||||
if iac_cmd[2] not in [BINARY]:
|
||||
if iac_cmd[2] not in [BINARY, NAWS]:
|
||||
log.debug("Unhandled WILL telnet command: "
|
||||
"{0:#x} {1:#x} {2:#x}".format(*iac_cmd))
|
||||
elif iac_cmd[1] == WONT:
|
||||
|
||||
@ -7,3 +7,4 @@ raven>=5.23.0
|
||||
psutil>=3.0.0
|
||||
zipstream>=1.1.4
|
||||
typing>=3.5.3.0 # Otherwise yarl fail with python 3.4
|
||||
prompt-toolkit
|
||||
|
||||
Loading…
Reference in New Issue
Block a user