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# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.
"""Implement standard (and unused) TCP protocols.
These protocols are either provided by inetd, or are not provided at all.
"""
from __future__ import absolute_import, division
import time
import struct
from zope.interface import implementer
from twisted.internet import protocol, interfaces
class Echo(protocol.Protocol):
"""
As soon as any data is received, write it back (RFC 862).
"""
def dataReceived(self, data):
self.transport.write(data)
class Discard(protocol.Protocol):
"""
Discard any received data (RFC 863).
"""
def dataReceived(self, data):
# I'm ignoring you, nyah-nyah
pass
@implementer(interfaces.IProducer)
class Chargen(protocol.Protocol):
"""
Generate repeating noise (RFC 864).
"""
noise = b'@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ !"#$%&?'
def connectionMade(self):
self.transport.registerProducer(self, 0)
def resumeProducing(self):
self.transport.write(self.noise)
def pauseProducing(self):
pass
def stopProducing(self):
pass
class QOTD(protocol.Protocol):
"""
Return a quote of the day (RFC 865).
"""
def connectionMade(self):
self.transport.write(self.getQuote())
self.transport.loseConnection()
def getQuote(self):
"""
Return a quote. May be overrriden in subclasses.
"""
return b"An apple a day keeps the doctor away.\r\n"
class Who(protocol.Protocol):
"""
Return list of active users (RFC 866)
"""
def connectionMade(self):
self.transport.write(self.getUsers())
self.transport.loseConnection()
def getUsers(self):
"""
Return active users. Override in subclasses.
"""
return b"root\r\n"
class Daytime(protocol.Protocol):
"""
Send back the daytime in ASCII form (RFC 867).
"""
def connectionMade(self):
self.transport.write(time.asctime(time.gmtime(time.time())) + b'\r\n')
self.transport.loseConnection()
class Time(protocol.Protocol):
"""
Send back the time in machine readable form (RFC 868).
"""
def connectionMade(self):
# is this correct only for 32-bit machines?
result = struct.pack("!i", int(time.time()))
self.transport.write(result)
self.transport.loseConnection()
__all__ = ["Echo", "Discard", "Chargen", "QOTD", "Who", "Daytime", "Time"]