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