##
# The MIT License (MIT)
#
# Copyright (c) 2016 Stefan Wendler
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
##
import sys
import telnetlib
import time
from collections import deque
from mp.conbase import ConBase, ConError
class ConTelnet(ConBase):
def __init__(self, ip, user, password):
ConBase.__init__(self)
if sys.version_info < (3, 0):
self.read = self.__read2
else:
self.read = self.__read3
self.tn = telnetlib.Telnet(ip)
if user == "":
self.fifo = deque()
return
if b"Login as:" in self.tn.read_until(b"Login as:", timeout=5.0):
self.tn.write(bytes(user.encode("ascii")) + b"\r\n")
if b"Password:" in self.tn.read_until(b"Password:", timeout=5.0):
# needed because of internal implementation details of the telnet server
time.sleep(0.2)
self.tn.write(bytes(password.encode("ascii")) + b"\r\n")
if b"for more information." in self.tn.read_until(
b'Type "help()" for more information.', timeout=5.0
):
self.fifo = deque()
return
raise ConError()
def __del__(self):
self.close()
def close(self):
try:
self.tn.close()
except Exception:
# the telnet object might not exist yet, so ignore this one
pass
def __fill_fifo(self, size):
while len(self.fifo) < size:
timeout_count = 0
data = self.tn.read_eager()
if len(data):
self.fifo.extend(data)
else:
time.sleep(0.25)
timeout_count += 1
def __read2(self, size=1):
self.__fill_fifo(size)
data = b""
while len(data) < size and len(self.fifo) > 0:
data += self.fifo.popleft()
return data
def __read3(self, size=1):
self.__fill_fifo(size)
data = b""
while len(data) < size and len(self.fifo) > 0:
data += bytes([self.fifo.popleft()])
return data
def write(self, data):
# print("write:", data)
self.tn.write(data)
return len(data)
def inWaiting(self):
n_waiting = len(self.fifo)
if not n_waiting:
data = self.tn.read_eager()
self.fifo.extend(data)
return len(data)
else:
return n_waiting
def survives_soft_reset(self):
return False
