1087 lines
37 KiB
Python
1087 lines
37 KiB
Python
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# -*- test-case-name: twisted.conch.test.test_telnet -*-
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# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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"""
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Telnet protocol implementation.
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@author: Jean-Paul Calderone
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"""
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import struct
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from zope.interface import implements
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from twisted.internet import protocol, interfaces as iinternet, defer
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from twisted.python import log
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MODE = chr(1)
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EDIT = 1
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TRAPSIG = 2
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MODE_ACK = 4
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SOFT_TAB = 8
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LIT_ECHO = 16
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# Characters gleaned from the various (and conflicting) RFCs. Not all of these are correct.
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NULL = chr(0) # No operation.
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BEL = chr(7) # Produces an audible or
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# visible signal (which does
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# NOT move the print head).
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BS = chr(8) # Moves the print head one
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# character position towards
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# the left margin.
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HT = chr(9) # Moves the printer to the
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# next horizontal tab stop.
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# It remains unspecified how
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# either party determines or
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# establishes where such tab
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# stops are located.
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LF = chr(10) # Moves the printer to the
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# next print line, keeping the
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# same horizontal position.
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VT = chr(11) # Moves the printer to the
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# next vertical tab stop. It
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# remains unspecified how
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# either party determines or
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# establishes where such tab
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# stops are located.
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FF = chr(12) # Moves the printer to the top
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# of the next page, keeping
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# the same horizontal position.
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CR = chr(13) # Moves the printer to the left
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# margin of the current line.
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ECHO = chr(1) # User-to-Server: Asks the server to send
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# Echos of the transmitted data.
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SGA = chr(3) # Suppress Go Ahead. Go Ahead is silly
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# and most modern servers should suppress
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# it.
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NAWS = chr(31) # Negotiate About Window Size. Indicate that
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# information about the size of the terminal
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# can be communicated.
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LINEMODE = chr(34) # Allow line buffering to be
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# negotiated about.
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SE = chr(240) # End of subnegotiation parameters.
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NOP = chr(241) # No operation.
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DM = chr(242) # "Data Mark": The data stream portion
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# of a Synch. This should always be
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# accompanied by a TCP Urgent
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# notification.
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BRK = chr(243) # NVT character Break.
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IP = chr(244) # The function Interrupt Process.
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AO = chr(245) # The function Abort Output
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AYT = chr(246) # The function Are You There.
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EC = chr(247) # The function Erase Character.
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EL = chr(248) # The function Erase Line
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GA = chr(249) # The Go Ahead signal.
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SB = chr(250) # Indicates that what follows is
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# subnegotiation of the indicated
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# option.
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WILL = chr(251) # Indicates the desire to begin
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# performing, or confirmation that
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# you are now performing, the
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# indicated option.
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WONT = chr(252) # Indicates the refusal to perform,
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# or continue performing, the
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# indicated option.
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DO = chr(253) # Indicates the request that the
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# other party perform, or
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# confirmation that you are expecting
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# the other party to perform, the
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# indicated option.
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DONT = chr(254) # Indicates the demand that the
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# other party stop performing,
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# or confirmation that you are no
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# longer expecting the other party
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# to perform, the indicated option.
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IAC = chr(255) # Data Byte 255. Introduces a
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# telnet command.
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LINEMODE_MODE = chr(1)
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LINEMODE_EDIT = chr(1)
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LINEMODE_TRAPSIG = chr(2)
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LINEMODE_MODE_ACK = chr(4)
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LINEMODE_SOFT_TAB = chr(8)
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LINEMODE_LIT_ECHO = chr(16)
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LINEMODE_FORWARDMASK = chr(2)
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LINEMODE_SLC = chr(3)
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LINEMODE_SLC_SYNCH = chr(1)
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LINEMODE_SLC_BRK = chr(2)
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LINEMODE_SLC_IP = chr(3)
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LINEMODE_SLC_AO = chr(4)
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LINEMODE_SLC_AYT = chr(5)
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LINEMODE_SLC_EOR = chr(6)
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LINEMODE_SLC_ABORT = chr(7)
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LINEMODE_SLC_EOF = chr(8)
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LINEMODE_SLC_SUSP = chr(9)
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LINEMODE_SLC_EC = chr(10)
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LINEMODE_SLC_EL = chr(11)
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LINEMODE_SLC_EW = chr(12)
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LINEMODE_SLC_RP = chr(13)
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LINEMODE_SLC_LNEXT = chr(14)
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LINEMODE_SLC_XON = chr(15)
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LINEMODE_SLC_XOFF = chr(16)
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LINEMODE_SLC_FORW1 = chr(17)
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LINEMODE_SLC_FORW2 = chr(18)
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LINEMODE_SLC_MCL = chr(19)
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LINEMODE_SLC_MCR = chr(20)
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LINEMODE_SLC_MCWL = chr(21)
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LINEMODE_SLC_MCWR = chr(22)
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LINEMODE_SLC_MCBOL = chr(23)
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LINEMODE_SLC_MCEOL = chr(24)
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LINEMODE_SLC_INSRT = chr(25)
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LINEMODE_SLC_OVER = chr(26)
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LINEMODE_SLC_ECR = chr(27)
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LINEMODE_SLC_EWR = chr(28)
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LINEMODE_SLC_EBOL = chr(29)
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LINEMODE_SLC_EEOL = chr(30)
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LINEMODE_SLC_DEFAULT = chr(3)
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LINEMODE_SLC_VALUE = chr(2)
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LINEMODE_SLC_CANTCHANGE = chr(1)
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LINEMODE_SLC_NOSUPPORT = chr(0)
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LINEMODE_SLC_LEVELBITS = chr(3)
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LINEMODE_SLC_ACK = chr(128)
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LINEMODE_SLC_FLUSHIN = chr(64)
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LINEMODE_SLC_FLUSHOUT = chr(32)
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LINEMODE_EOF = chr(236)
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LINEMODE_SUSP = chr(237)
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LINEMODE_ABORT = chr(238)
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class ITelnetProtocol(iinternet.IProtocol):
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def unhandledCommand(command, argument):
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"""A command was received but not understood.
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@param command: the command received.
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@type command: C{str}, a single character.
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@param argument: the argument to the received command.
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@type argument: C{str}, a single character, or None if the command that
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was unhandled does not provide an argument.
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"""
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def unhandledSubnegotiation(command, bytes):
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"""A subnegotiation command was received but not understood.
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@param command: the command being subnegotiated. That is, the first
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byte after the SB command.
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@type command: C{str}, a single character.
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@param bytes: all other bytes of the subneogation. That is, all but the
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first bytes between SB and SE, with IAC un-escaping applied.
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@type bytes: C{list} of C{str}, each a single character
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"""
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def enableLocal(option):
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"""Enable the given option locally.
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This should enable the given option on this side of the
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telnet connection and return True. If False is returned,
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the option will be treated as still disabled and the peer
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will be notified.
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@param option: the option to be enabled.
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@type option: C{str}, a single character.
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"""
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def enableRemote(option):
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"""Indicate whether the peer should be allowed to enable this option.
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Returns True if the peer should be allowed to enable this option,
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False otherwise.
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@param option: the option to be enabled.
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@type option: C{str}, a single character.
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"""
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def disableLocal(option):
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"""Disable the given option locally.
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Unlike enableLocal, this method cannot fail. The option must be
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disabled.
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@param option: the option to be disabled.
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@type option: C{str}, a single character.
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"""
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def disableRemote(option):
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"""Indicate that the peer has disabled this option.
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@param option: the option to be disabled.
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@type option: C{str}, a single character.
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"""
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class ITelnetTransport(iinternet.ITransport):
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def do(option):
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"""
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Indicate a desire for the peer to begin performing the given option.
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Returns a Deferred that fires with True when the peer begins performing
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the option, or fails with L{OptionRefused} when the peer refuses to
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perform it. If the peer is already performing the given option, the
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Deferred will fail with L{AlreadyEnabled}. If a negotiation regarding
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this option is already in progress, the Deferred will fail with
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L{AlreadyNegotiating}.
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Note: It is currently possible that this Deferred will never fire,
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if the peer never responds, or if the peer believes the option to
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already be enabled.
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"""
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def dont(option):
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"""
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Indicate a desire for the peer to cease performing the given option.
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Returns a Deferred that fires with True when the peer ceases performing
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the option. If the peer is not performing the given option, the
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Deferred will fail with L{AlreadyDisabled}. If negotiation regarding
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this option is already in progress, the Deferred will fail with
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L{AlreadyNegotiating}.
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Note: It is currently possible that this Deferred will never fire,
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if the peer never responds, or if the peer believes the option to
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already be disabled.
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"""
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def will(option):
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"""
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Indicate our willingness to begin performing this option locally.
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Returns a Deferred that fires with True when the peer agrees to allow us
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to begin performing this option, or fails with L{OptionRefused} if the
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peer refuses to allow us to begin performing it. If the option is
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already enabled locally, the Deferred will fail with L{AlreadyEnabled}.
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If negotiation regarding this option is already in progress, the
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Deferred will fail with L{AlreadyNegotiating}.
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Note: It is currently possible that this Deferred will never fire,
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if the peer never responds, or if the peer believes the option to
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already be enabled.
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"""
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def wont(option):
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"""
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Indicate that we will stop performing the given option.
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Returns a Deferred that fires with True when the peer acknowledges
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we have stopped performing this option. If the option is already
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disabled locally, the Deferred will fail with L{AlreadyDisabled}.
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If negotiation regarding this option is already in progress,
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the Deferred will fail with L{AlreadyNegotiating}.
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Note: It is currently possible that this Deferred will never fire,
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if the peer never responds, or if the peer believes the option to
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already be disabled.
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"""
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def requestNegotiation(about, bytes):
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"""
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Send a subnegotiation request.
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@param about: A byte indicating the feature being negotiated.
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@param bytes: Any number of bytes containing specific information
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about the negotiation being requested. No values in this string
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need to be escaped, as this function will escape any value which
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requires it.
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"""
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class TelnetError(Exception):
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pass
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class NegotiationError(TelnetError):
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def __str__(self):
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return self.__class__.__module__ + '.' + self.__class__.__name__ + ':' + repr(self.args[0])
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class OptionRefused(NegotiationError):
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pass
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class AlreadyEnabled(NegotiationError):
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pass
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class AlreadyDisabled(NegotiationError):
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pass
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class AlreadyNegotiating(NegotiationError):
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pass
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class TelnetProtocol(protocol.Protocol):
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implements(ITelnetProtocol)
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def unhandledCommand(self, command, argument):
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pass
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def unhandledSubnegotiation(self, command, bytes):
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pass
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def enableLocal(self, option):
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pass
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def enableRemote(self, option):
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pass
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def disableLocal(self, option):
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pass
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def disableRemote(self, option):
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pass
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class Telnet(protocol.Protocol):
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"""
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@ivar commandMap: A mapping of bytes to callables. When a
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telnet command is received, the command byte (the first byte
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after IAC) is looked up in this dictionary. If a callable is
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found, it is invoked with the argument of the command, or None
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if the command takes no argument. Values should be added to
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this dictionary if commands wish to be handled. By default,
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only WILL, WONT, DO, and DONT are handled. These should not
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be overridden, as this class handles them correctly and
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provides an API for interacting with them.
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@ivar negotiationMap: A mapping of bytes to callables. When
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a subnegotiation command is received, the command byte (the
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first byte after SB) is looked up in this dictionary. If
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a callable is found, it is invoked with the argument of the
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subnegotiation. Values should be added to this dictionary if
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subnegotiations are to be handled. By default, no values are
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handled.
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@ivar options: A mapping of option bytes to their current
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state. This state is likely of little use to user code.
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Changes should not be made to it.
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@ivar state: A string indicating the current parse state. It
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can take on the values "data", "escaped", "command", "newline",
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"subnegotiation", and "subnegotiation-escaped". Changes
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should not be made to it.
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@ivar transport: This protocol's transport object.
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"""
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# One of a lot of things
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state = 'data'
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def __init__(self):
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self.options = {}
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self.negotiationMap = {}
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self.commandMap = {
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|
|
WILL: self.telnet_WILL,
|
||
|
|
WONT: self.telnet_WONT,
|
||
|
|
DO: self.telnet_DO,
|
||
|
|
DONT: self.telnet_DONT}
|
||
|
|
|
||
|
|
def _write(self, bytes):
|
||
|
|
self.transport.write(bytes)
|
||
|
|
|
||
|
|
class _OptionState:
|
||
|
|
"""
|
||
|
|
Represents the state of an option on both sides of a telnet
|
||
|
|
connection.
|
||
|
|
|
||
|
|
@ivar us: The state of the option on this side of the connection.
|
||
|
|
|
||
|
|
@ivar him: The state of the option on the other side of the
|
||
|
|
connection.
|
||
|
|
"""
|
||
|
|
class _Perspective:
|
||
|
|
"""
|
||
|
|
Represents the state of an option on side of the telnet
|
||
|
|
connection. Some options can be enabled on a particular side of
|
||
|
|
the connection (RFC 1073 for example: only the client can have
|
||
|
|
NAWS enabled). Other options can be enabled on either or both
|
||
|
|
sides (such as RFC 1372: each side can have its own flow control
|
||
|
|
state).
|
||
|
|
|
||
|
|
@ivar state: C{'yes'} or C{'no'} indicating whether or not this
|
||
|
|
option is enabled on one side of the connection.
|
||
|
|
|
||
|
|
@ivar negotiating: A boolean tracking whether negotiation about
|
||
|
|
this option is in progress.
|
||
|
|
|
||
|
|
@ivar onResult: When negotiation about this option has been
|
||
|
|
initiated by this side of the connection, a L{Deferred}
|
||
|
|
which will fire with the result of the negotiation. C{None}
|
||
|
|
at other times.
|
||
|
|
"""
|
||
|
|
state = 'no'
|
||
|
|
negotiating = False
|
||
|
|
onResult = None
|
||
|
|
|
||
|
|
def __str__(self):
|
||
|
|
return self.state + ('*' * self.negotiating)
|
||
|
|
|
||
|
|
def __init__(self):
|
||
|
|
self.us = self._Perspective()
|
||
|
|
self.him = self._Perspective()
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return '<_OptionState us=%s him=%s>' % (self.us, self.him)
|
||
|
|
|
||
|
|
def getOptionState(self, opt):
|
||
|
|
return self.options.setdefault(opt, self._OptionState())
|
||
|
|
|
||
|
|
def _do(self, option):
|
||
|
|
self._write(IAC + DO + option)
|
||
|
|
|
||
|
|
def _dont(self, option):
|
||
|
|
self._write(IAC + DONT + option)
|
||
|
|
|
||
|
|
def _will(self, option):
|
||
|
|
self._write(IAC + WILL + option)
|
||
|
|
|
||
|
|
def _wont(self, option):
|
||
|
|
self._write(IAC + WONT + option)
|
||
|
|
|
||
|
|
def will(self, option):
|
||
|
|
"""Indicate our willingness to enable an option.
|
||
|
|
"""
|
||
|
|
s = self.getOptionState(option)
|
||
|
|
if s.us.negotiating or s.him.negotiating:
|
||
|
|
return defer.fail(AlreadyNegotiating(option))
|
||
|
|
elif s.us.state == 'yes':
|
||
|
|
return defer.fail(AlreadyEnabled(option))
|
||
|
|
else:
|
||
|
|
s.us.negotiating = True
|
||
|
|
s.us.onResult = d = defer.Deferred()
|
||
|
|
self._will(option)
|
||
|
|
return d
|
||
|
|
|
||
|
|
def wont(self, option):
|
||
|
|
"""Indicate we are not willing to enable an option.
|
||
|
|
"""
|
||
|
|
s = self.getOptionState(option)
|
||
|
|
if s.us.negotiating or s.him.negotiating:
|
||
|
|
return defer.fail(AlreadyNegotiating(option))
|
||
|
|
elif s.us.state == 'no':
|
||
|
|
return defer.fail(AlreadyDisabled(option))
|
||
|
|
else:
|
||
|
|
s.us.negotiating = True
|
||
|
|
s.us.onResult = d = defer.Deferred()
|
||
|
|
self._wont(option)
|
||
|
|
return d
|
||
|
|
|
||
|
|
def do(self, option):
|
||
|
|
s = self.getOptionState(option)
|
||
|
|
if s.us.negotiating or s.him.negotiating:
|
||
|
|
return defer.fail(AlreadyNegotiating(option))
|
||
|
|
elif s.him.state == 'yes':
|
||
|
|
return defer.fail(AlreadyEnabled(option))
|
||
|
|
else:
|
||
|
|
s.him.negotiating = True
|
||
|
|
s.him.onResult = d = defer.Deferred()
|
||
|
|
self._do(option)
|
||
|
|
return d
|
||
|
|
|
||
|
|
def dont(self, option):
|
||
|
|
s = self.getOptionState(option)
|
||
|
|
if s.us.negotiating or s.him.negotiating:
|
||
|
|
return defer.fail(AlreadyNegotiating(option))
|
||
|
|
elif s.him.state == 'no':
|
||
|
|
return defer.fail(AlreadyDisabled(option))
|
||
|
|
else:
|
||
|
|
s.him.negotiating = True
|
||
|
|
s.him.onResult = d = defer.Deferred()
|
||
|
|
self._dont(option)
|
||
|
|
return d
|
||
|
|
|
||
|
|
|
||
|
|
def requestNegotiation(self, about, bytes):
|
||
|
|
"""
|
||
|
|
Send a negotiation message for the option C{about} with C{bytes} as the
|
||
|
|
payload.
|
||
|
|
|
||
|
|
@see: L{ITelnetTransport.requestNegotiation}
|
||
|
|
"""
|
||
|
|
bytes = bytes.replace(IAC, IAC * 2)
|
||
|
|
self._write(IAC + SB + about + bytes + IAC + SE)
|
||
|
|
|
||
|
|
|
||
|
|
def dataReceived(self, data):
|
||
|
|
appDataBuffer = []
|
||
|
|
|
||
|
|
for b in data:
|
||
|
|
if self.state == 'data':
|
||
|
|
if b == IAC:
|
||
|
|
self.state = 'escaped'
|
||
|
|
elif b == '\r':
|
||
|
|
self.state = 'newline'
|
||
|
|
else:
|
||
|
|
appDataBuffer.append(b)
|
||
|
|
elif self.state == 'escaped':
|
||
|
|
if b == IAC:
|
||
|
|
appDataBuffer.append(b)
|
||
|
|
self.state = 'data'
|
||
|
|
elif b == SB:
|
||
|
|
self.state = 'subnegotiation'
|
||
|
|
self.commands = []
|
||
|
|
elif b in (NOP, DM, BRK, IP, AO, AYT, EC, EL, GA):
|
||
|
|
self.state = 'data'
|
||
|
|
if appDataBuffer:
|
||
|
|
self.applicationDataReceived(''.join(appDataBuffer))
|
||
|
|
del appDataBuffer[:]
|
||
|
|
self.commandReceived(b, None)
|
||
|
|
elif b in (WILL, WONT, DO, DONT):
|
||
|
|
self.state = 'command'
|
||
|
|
self.command = b
|
||
|
|
else:
|
||
|
|
raise ValueError("Stumped", b)
|
||
|
|
elif self.state == 'command':
|
||
|
|
self.state = 'data'
|
||
|
|
command = self.command
|
||
|
|
del self.command
|
||
|
|
if appDataBuffer:
|
||
|
|
self.applicationDataReceived(''.join(appDataBuffer))
|
||
|
|
del appDataBuffer[:]
|
||
|
|
self.commandReceived(command, b)
|
||
|
|
elif self.state == 'newline':
|
||
|
|
self.state = 'data'
|
||
|
|
if b == '\n':
|
||
|
|
appDataBuffer.append('\n')
|
||
|
|
elif b == '\0':
|
||
|
|
appDataBuffer.append('\r')
|
||
|
|
elif b == IAC:
|
||
|
|
# IAC isn't really allowed after \r, according to the
|
||
|
|
# RFC, but handling it this way is less surprising than
|
||
|
|
# delivering the IAC to the app as application data.
|
||
|
|
# The purpose of the restriction is to allow terminals
|
||
|
|
# to unambiguously interpret the behavior of the CR
|
||
|
|
# after reading only one more byte. CR LF is supposed
|
||
|
|
# to mean one thing (cursor to next line, first column),
|
||
|
|
# CR NUL another (cursor to first column). Absent the
|
||
|
|
# NUL, it still makes sense to interpret this as CR and
|
||
|
|
# then apply all the usual interpretation to the IAC.
|
||
|
|
appDataBuffer.append('\r')
|
||
|
|
self.state = 'escaped'
|
||
|
|
else:
|
||
|
|
appDataBuffer.append('\r' + b)
|
||
|
|
elif self.state == 'subnegotiation':
|
||
|
|
if b == IAC:
|
||
|
|
self.state = 'subnegotiation-escaped'
|
||
|
|
else:
|
||
|
|
self.commands.append(b)
|
||
|
|
elif self.state == 'subnegotiation-escaped':
|
||
|
|
if b == SE:
|
||
|
|
self.state = 'data'
|
||
|
|
commands = self.commands
|
||
|
|
del self.commands
|
||
|
|
if appDataBuffer:
|
||
|
|
self.applicationDataReceived(''.join(appDataBuffer))
|
||
|
|
del appDataBuffer[:]
|
||
|
|
self.negotiate(commands)
|
||
|
|
else:
|
||
|
|
self.state = 'subnegotiation'
|
||
|
|
self.commands.append(b)
|
||
|
|
else:
|
||
|
|
raise ValueError("How'd you do this?")
|
||
|
|
|
||
|
|
if appDataBuffer:
|
||
|
|
self.applicationDataReceived(''.join(appDataBuffer))
|
||
|
|
|
||
|
|
|
||
|
|
def connectionLost(self, reason):
|
||
|
|
for state in self.options.values():
|
||
|
|
if state.us.onResult is not None:
|
||
|
|
d = state.us.onResult
|
||
|
|
state.us.onResult = None
|
||
|
|
d.errback(reason)
|
||
|
|
if state.him.onResult is not None:
|
||
|
|
d = state.him.onResult
|
||
|
|
state.him.onResult = None
|
||
|
|
d.errback(reason)
|
||
|
|
|
||
|
|
def applicationDataReceived(self, bytes):
|
||
|
|
"""Called with application-level data.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def unhandledCommand(self, command, argument):
|
||
|
|
"""Called for commands for which no handler is installed.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def commandReceived(self, command, argument):
|
||
|
|
cmdFunc = self.commandMap.get(command)
|
||
|
|
if cmdFunc is None:
|
||
|
|
self.unhandledCommand(command, argument)
|
||
|
|
else:
|
||
|
|
cmdFunc(argument)
|
||
|
|
|
||
|
|
def unhandledSubnegotiation(self, command, bytes):
|
||
|
|
"""Called for subnegotiations for which no handler is installed.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def negotiate(self, bytes):
|
||
|
|
command, bytes = bytes[0], bytes[1:]
|
||
|
|
cmdFunc = self.negotiationMap.get(command)
|
||
|
|
if cmdFunc is None:
|
||
|
|
self.unhandledSubnegotiation(command, bytes)
|
||
|
|
else:
|
||
|
|
cmdFunc(bytes)
|
||
|
|
|
||
|
|
def telnet_WILL(self, option):
|
||
|
|
s = self.getOptionState(option)
|
||
|
|
self.willMap[s.him.state, s.him.negotiating](self, s, option)
|
||
|
|
|
||
|
|
def will_no_false(self, state, option):
|
||
|
|
# He is unilaterally offering to enable an option.
|
||
|
|
if self.enableRemote(option):
|
||
|
|
state.him.state = 'yes'
|
||
|
|
self._do(option)
|
||
|
|
else:
|
||
|
|
self._dont(option)
|
||
|
|
|
||
|
|
def will_no_true(self, state, option):
|
||
|
|
# Peer agreed to enable an option in response to our request.
|
||
|
|
state.him.state = 'yes'
|
||
|
|
state.him.negotiating = False
|
||
|
|
d = state.him.onResult
|
||
|
|
state.him.onResult = None
|
||
|
|
d.callback(True)
|
||
|
|
assert self.enableRemote(option), "enableRemote must return True in this context (for option %r)" % (option,)
|
||
|
|
|
||
|
|
def will_yes_false(self, state, option):
|
||
|
|
# He is unilaterally offering to enable an already-enabled option.
|
||
|
|
# Ignore this.
|
||
|
|
pass
|
||
|
|
|
||
|
|
def will_yes_true(self, state, option):
|
||
|
|
# This is a bogus state. It is here for completeness. It will
|
||
|
|
# never be entered.
|
||
|
|
assert False, "will_yes_true can never be entered, but was called with %r, %r" % (state, option)
|
||
|
|
|
||
|
|
willMap = {('no', False): will_no_false, ('no', True): will_no_true,
|
||
|
|
('yes', False): will_yes_false, ('yes', True): will_yes_true}
|
||
|
|
|
||
|
|
def telnet_WONT(self, option):
|
||
|
|
s = self.getOptionState(option)
|
||
|
|
self.wontMap[s.him.state, s.him.negotiating](self, s, option)
|
||
|
|
|
||
|
|
def wont_no_false(self, state, option):
|
||
|
|
# He is unilaterally demanding that an already-disabled option be/remain disabled.
|
||
|
|
# Ignore this (although we could record it and refuse subsequent enable attempts
|
||
|
|
# from our side - he can always refuse them again though, so we won't)
|
||
|
|
pass
|
||
|
|
|
||
|
|
def wont_no_true(self, state, option):
|
||
|
|
# Peer refused to enable an option in response to our request.
|
||
|
|
state.him.negotiating = False
|
||
|
|
d = state.him.onResult
|
||
|
|
state.him.onResult = None
|
||
|
|
d.errback(OptionRefused(option))
|
||
|
|
|
||
|
|
def wont_yes_false(self, state, option):
|
||
|
|
# Peer is unilaterally demanding that an option be disabled.
|
||
|
|
state.him.state = 'no'
|
||
|
|
self.disableRemote(option)
|
||
|
|
self._dont(option)
|
||
|
|
|
||
|
|
def wont_yes_true(self, state, option):
|
||
|
|
# Peer agreed to disable an option at our request.
|
||
|
|
state.him.state = 'no'
|
||
|
|
state.him.negotiating = False
|
||
|
|
d = state.him.onResult
|
||
|
|
state.him.onResult = None
|
||
|
|
d.callback(True)
|
||
|
|
self.disableRemote(option)
|
||
|
|
|
||
|
|
wontMap = {('no', False): wont_no_false, ('no', True): wont_no_true,
|
||
|
|
('yes', False): wont_yes_false, ('yes', True): wont_yes_true}
|
||
|
|
|
||
|
|
def telnet_DO(self, option):
|
||
|
|
s = self.getOptionState(option)
|
||
|
|
self.doMap[s.us.state, s.us.negotiating](self, s, option)
|
||
|
|
|
||
|
|
def do_no_false(self, state, option):
|
||
|
|
# Peer is unilaterally requesting that we enable an option.
|
||
|
|
if self.enableLocal(option):
|
||
|
|
state.us.state = 'yes'
|
||
|
|
self._will(option)
|
||
|
|
else:
|
||
|
|
self._wont(option)
|
||
|
|
|
||
|
|
def do_no_true(self, state, option):
|
||
|
|
# Peer agreed to allow us to enable an option at our request.
|
||
|
|
state.us.state = 'yes'
|
||
|
|
state.us.negotiating = False
|
||
|
|
d = state.us.onResult
|
||
|
|
state.us.onResult = None
|
||
|
|
d.callback(True)
|
||
|
|
self.enableLocal(option)
|
||
|
|
|
||
|
|
def do_yes_false(self, state, option):
|
||
|
|
# Peer is unilaterally requesting us to enable an already-enabled option.
|
||
|
|
# Ignore this.
|
||
|
|
pass
|
||
|
|
|
||
|
|
def do_yes_true(self, state, option):
|
||
|
|
# This is a bogus state. It is here for completeness. It will never be
|
||
|
|
# entered.
|
||
|
|
assert False, "do_yes_true can never be entered, but was called with %r, %r" % (state, option)
|
||
|
|
|
||
|
|
doMap = {('no', False): do_no_false, ('no', True): do_no_true,
|
||
|
|
('yes', False): do_yes_false, ('yes', True): do_yes_true}
|
||
|
|
|
||
|
|
def telnet_DONT(self, option):
|
||
|
|
s = self.getOptionState(option)
|
||
|
|
self.dontMap[s.us.state, s.us.negotiating](self, s, option)
|
||
|
|
|
||
|
|
def dont_no_false(self, state, option):
|
||
|
|
# Peer is unilaterally demanding us to disable an already-disabled option.
|
||
|
|
# Ignore this.
|
||
|
|
pass
|
||
|
|
|
||
|
|
def dont_no_true(self, state, option):
|
||
|
|
# Offered option was refused. Fail the Deferred returned by the
|
||
|
|
# previous will() call.
|
||
|
|
state.us.negotiating = False
|
||
|
|
d = state.us.onResult
|
||
|
|
state.us.onResult = None
|
||
|
|
d.errback(OptionRefused(option))
|
||
|
|
|
||
|
|
def dont_yes_false(self, state, option):
|
||
|
|
# Peer is unilaterally demanding we disable an option.
|
||
|
|
state.us.state = 'no'
|
||
|
|
self.disableLocal(option)
|
||
|
|
self._wont(option)
|
||
|
|
|
||
|
|
def dont_yes_true(self, state, option):
|
||
|
|
# Peer acknowledged our notice that we will disable an option.
|
||
|
|
state.us.state = 'no'
|
||
|
|
state.us.negotiating = False
|
||
|
|
d = state.us.onResult
|
||
|
|
state.us.onResult = None
|
||
|
|
d.callback(True)
|
||
|
|
self.disableLocal(option)
|
||
|
|
|
||
|
|
dontMap = {('no', False): dont_no_false, ('no', True): dont_no_true,
|
||
|
|
('yes', False): dont_yes_false, ('yes', True): dont_yes_true}
|
||
|
|
|
||
|
|
def enableLocal(self, option):
|
||
|
|
"""
|
||
|
|
Reject all attempts to enable options.
|
||
|
|
"""
|
||
|
|
return False
|
||
|
|
|
||
|
|
|
||
|
|
def enableRemote(self, option):
|
||
|
|
"""
|
||
|
|
Reject all attempts to enable options.
|
||
|
|
"""
|
||
|
|
return False
|
||
|
|
|
||
|
|
|
||
|
|
def disableLocal(self, option):
|
||
|
|
"""
|
||
|
|
Signal a programming error by raising an exception.
|
||
|
|
|
||
|
|
L{enableLocal} must return true for the given value of C{option} in
|
||
|
|
order for this method to be called. If a subclass of L{Telnet}
|
||
|
|
overrides enableLocal to allow certain options to be enabled, it must
|
||
|
|
also override disableLocal to disable those options.
|
||
|
|
|
||
|
|
@raise NotImplementedError: Always raised.
|
||
|
|
"""
|
||
|
|
raise NotImplementedError(
|
||
|
|
"Don't know how to disable local telnet option %r" % (option,))
|
||
|
|
|
||
|
|
|
||
|
|
def disableRemote(self, option):
|
||
|
|
"""
|
||
|
|
Signal a programming error by raising an exception.
|
||
|
|
|
||
|
|
L{enableRemote} must return true for the given value of C{option} in
|
||
|
|
order for this method to be called. If a subclass of L{Telnet}
|
||
|
|
overrides enableRemote to allow certain options to be enabled, it must
|
||
|
|
also override disableRemote tto disable those options.
|
||
|
|
|
||
|
|
@raise NotImplementedError: Always raised.
|
||
|
|
"""
|
||
|
|
raise NotImplementedError(
|
||
|
|
"Don't know how to disable remote telnet option %r" % (option,))
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
class ProtocolTransportMixin:
|
||
|
|
def write(self, bytes):
|
||
|
|
self.transport.write(bytes.replace('\n', '\r\n'))
|
||
|
|
|
||
|
|
def writeSequence(self, seq):
|
||
|
|
self.transport.writeSequence(seq)
|
||
|
|
|
||
|
|
def loseConnection(self):
|
||
|
|
self.transport.loseConnection()
|
||
|
|
|
||
|
|
def getHost(self):
|
||
|
|
return self.transport.getHost()
|
||
|
|
|
||
|
|
def getPeer(self):
|
||
|
|
return self.transport.getPeer()
|
||
|
|
|
||
|
|
class TelnetTransport(Telnet, ProtocolTransportMixin):
|
||
|
|
"""
|
||
|
|
@ivar protocol: An instance of the protocol to which this
|
||
|
|
transport is connected, or None before the connection is
|
||
|
|
established and after it is lost.
|
||
|
|
|
||
|
|
@ivar protocolFactory: A callable which returns protocol instances
|
||
|
|
which provide L{ITelnetProtocol}. This will be invoked when a
|
||
|
|
connection is established. It is passed *protocolArgs and
|
||
|
|
**protocolKwArgs.
|
||
|
|
|
||
|
|
@ivar protocolArgs: A tuple of additional arguments to
|
||
|
|
pass to protocolFactory.
|
||
|
|
|
||
|
|
@ivar protocolKwArgs: A dictionary of additional arguments
|
||
|
|
to pass to protocolFactory.
|
||
|
|
"""
|
||
|
|
|
||
|
|
disconnecting = False
|
||
|
|
|
||
|
|
protocolFactory = None
|
||
|
|
protocol = None
|
||
|
|
|
||
|
|
def __init__(self, protocolFactory=None, *a, **kw):
|
||
|
|
Telnet.__init__(self)
|
||
|
|
if protocolFactory is not None:
|
||
|
|
self.protocolFactory = protocolFactory
|
||
|
|
self.protocolArgs = a
|
||
|
|
self.protocolKwArgs = kw
|
||
|
|
|
||
|
|
def connectionMade(self):
|
||
|
|
if self.protocolFactory is not None:
|
||
|
|
self.protocol = self.protocolFactory(*self.protocolArgs, **self.protocolKwArgs)
|
||
|
|
assert ITelnetProtocol.providedBy(self.protocol)
|
||
|
|
try:
|
||
|
|
factory = self.factory
|
||
|
|
except AttributeError:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
self.protocol.factory = factory
|
||
|
|
self.protocol.makeConnection(self)
|
||
|
|
|
||
|
|
def connectionLost(self, reason):
|
||
|
|
Telnet.connectionLost(self, reason)
|
||
|
|
if self.protocol is not None:
|
||
|
|
try:
|
||
|
|
self.protocol.connectionLost(reason)
|
||
|
|
finally:
|
||
|
|
del self.protocol
|
||
|
|
|
||
|
|
def enableLocal(self, option):
|
||
|
|
return self.protocol.enableLocal(option)
|
||
|
|
|
||
|
|
def enableRemote(self, option):
|
||
|
|
return self.protocol.enableRemote(option)
|
||
|
|
|
||
|
|
def disableLocal(self, option):
|
||
|
|
return self.protocol.disableLocal(option)
|
||
|
|
|
||
|
|
def disableRemote(self, option):
|
||
|
|
return self.protocol.disableRemote(option)
|
||
|
|
|
||
|
|
def unhandledSubnegotiation(self, command, bytes):
|
||
|
|
self.protocol.unhandledSubnegotiation(command, bytes)
|
||
|
|
|
||
|
|
def unhandledCommand(self, command, argument):
|
||
|
|
self.protocol.unhandledCommand(command, argument)
|
||
|
|
|
||
|
|
def applicationDataReceived(self, bytes):
|
||
|
|
self.protocol.dataReceived(bytes)
|
||
|
|
|
||
|
|
def write(self, data):
|
||
|
|
ProtocolTransportMixin.write(self, data.replace('\xff','\xff\xff'))
|
||
|
|
|
||
|
|
|
||
|
|
class TelnetBootstrapProtocol(TelnetProtocol, ProtocolTransportMixin):
|
||
|
|
implements()
|
||
|
|
|
||
|
|
protocol = None
|
||
|
|
|
||
|
|
def __init__(self, protocolFactory, *args, **kw):
|
||
|
|
self.protocolFactory = protocolFactory
|
||
|
|
self.protocolArgs = args
|
||
|
|
self.protocolKwArgs = kw
|
||
|
|
|
||
|
|
def connectionMade(self):
|
||
|
|
self.transport.negotiationMap[NAWS] = self.telnet_NAWS
|
||
|
|
self.transport.negotiationMap[LINEMODE] = self.telnet_LINEMODE
|
||
|
|
|
||
|
|
for opt in (LINEMODE, NAWS, SGA):
|
||
|
|
self.transport.do(opt).addErrback(log.err)
|
||
|
|
for opt in (ECHO,):
|
||
|
|
self.transport.will(opt).addErrback(log.err)
|
||
|
|
|
||
|
|
self.protocol = self.protocolFactory(*self.protocolArgs, **self.protocolKwArgs)
|
||
|
|
|
||
|
|
try:
|
||
|
|
factory = self.factory
|
||
|
|
except AttributeError:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
self.protocol.factory = factory
|
||
|
|
|
||
|
|
self.protocol.makeConnection(self)
|
||
|
|
|
||
|
|
def connectionLost(self, reason):
|
||
|
|
if self.protocol is not None:
|
||
|
|
try:
|
||
|
|
self.protocol.connectionLost(reason)
|
||
|
|
finally:
|
||
|
|
del self.protocol
|
||
|
|
|
||
|
|
def dataReceived(self, data):
|
||
|
|
self.protocol.dataReceived(data)
|
||
|
|
|
||
|
|
def enableLocal(self, opt):
|
||
|
|
if opt == ECHO:
|
||
|
|
return True
|
||
|
|
elif opt == SGA:
|
||
|
|
return True
|
||
|
|
else:
|
||
|
|
return False
|
||
|
|
|
||
|
|
def enableRemote(self, opt):
|
||
|
|
if opt == LINEMODE:
|
||
|
|
self.transport.requestNegotiation(LINEMODE, MODE + chr(TRAPSIG))
|
||
|
|
return True
|
||
|
|
elif opt == NAWS:
|
||
|
|
return True
|
||
|
|
elif opt == SGA:
|
||
|
|
return True
|
||
|
|
else:
|
||
|
|
return False
|
||
|
|
|
||
|
|
def telnet_NAWS(self, bytes):
|
||
|
|
# NAWS is client -> server *only*. self.protocol will
|
||
|
|
# therefore be an ITerminalTransport, the `.protocol'
|
||
|
|
# attribute of which will be an ITerminalProtocol. Maybe.
|
||
|
|
# You know what, XXX TODO clean this up.
|
||
|
|
if len(bytes) == 4:
|
||
|
|
width, height = struct.unpack('!HH', ''.join(bytes))
|
||
|
|
self.protocol.terminalProtocol.terminalSize(width, height)
|
||
|
|
else:
|
||
|
|
log.msg("Wrong number of NAWS bytes")
|
||
|
|
|
||
|
|
|
||
|
|
linemodeSubcommands = {
|
||
|
|
LINEMODE_SLC: 'SLC'}
|
||
|
|
def telnet_LINEMODE(self, bytes):
|
||
|
|
revmap = {}
|
||
|
|
linemodeSubcommand = bytes[0]
|
||
|
|
if 0:
|
||
|
|
# XXX TODO: This should be enabled to parse linemode subnegotiation.
|
||
|
|
getattr(self, 'linemode_' + self.linemodeSubcommands[linemodeSubcommand])(bytes[1:])
|
||
|
|
|
||
|
|
def linemode_SLC(self, bytes):
|
||
|
|
chunks = zip(*[iter(bytes)]*3)
|
||
|
|
for slcFunction, slcValue, slcWhat in chunks:
|
||
|
|
# Later, we should parse stuff.
|
||
|
|
'SLC', ord(slcFunction), ord(slcValue), ord(slcWhat)
|
||
|
|
|
||
|
|
from twisted.protocols import basic
|
||
|
|
|
||
|
|
class StatefulTelnetProtocol(basic.LineReceiver, TelnetProtocol):
|
||
|
|
delimiter = '\n'
|
||
|
|
|
||
|
|
state = 'Discard'
|
||
|
|
|
||
|
|
def connectionLost(self, reason):
|
||
|
|
basic.LineReceiver.connectionLost(self, reason)
|
||
|
|
TelnetProtocol.connectionLost(self, reason)
|
||
|
|
|
||
|
|
def lineReceived(self, line):
|
||
|
|
oldState = self.state
|
||
|
|
newState = getattr(self, "telnet_" + oldState)(line)
|
||
|
|
if newState is not None:
|
||
|
|
if self.state == oldState:
|
||
|
|
self.state = newState
|
||
|
|
else:
|
||
|
|
log.msg("Warning: state changed and new state returned")
|
||
|
|
|
||
|
|
def telnet_Discard(self, line):
|
||
|
|
pass
|
||
|
|
|
||
|
|
from twisted.cred import credentials
|
||
|
|
|
||
|
|
class AuthenticatingTelnetProtocol(StatefulTelnetProtocol):
|
||
|
|
"""A protocol which prompts for credentials and attempts to authenticate them.
|
||
|
|
|
||
|
|
Username and password prompts are given (the password is obscured). When the
|
||
|
|
information is collected, it is passed to a portal and an avatar implementing
|
||
|
|
L{ITelnetProtocol} is requested. If an avatar is returned, it connected to this
|
||
|
|
protocol's transport, and this protocol's transport is connected to it.
|
||
|
|
Otherwise, the user is re-prompted for credentials.
|
||
|
|
"""
|
||
|
|
|
||
|
|
state = "User"
|
||
|
|
protocol = None
|
||
|
|
|
||
|
|
def __init__(self, portal):
|
||
|
|
self.portal = portal
|
||
|
|
|
||
|
|
def connectionMade(self):
|
||
|
|
self.transport.write("Username: ")
|
||
|
|
|
||
|
|
def connectionLost(self, reason):
|
||
|
|
StatefulTelnetProtocol.connectionLost(self, reason)
|
||
|
|
if self.protocol is not None:
|
||
|
|
try:
|
||
|
|
self.protocol.connectionLost(reason)
|
||
|
|
self.logout()
|
||
|
|
finally:
|
||
|
|
del self.protocol, self.logout
|
||
|
|
|
||
|
|
def telnet_User(self, line):
|
||
|
|
self.username = line
|
||
|
|
self.transport.will(ECHO)
|
||
|
|
self.transport.write("Password: ")
|
||
|
|
return 'Password'
|
||
|
|
|
||
|
|
def telnet_Password(self, line):
|
||
|
|
username, password = self.username, line
|
||
|
|
del self.username
|
||
|
|
def login(ignored):
|
||
|
|
creds = credentials.UsernamePassword(username, password)
|
||
|
|
d = self.portal.login(creds, None, ITelnetProtocol)
|
||
|
|
d.addCallback(self._cbLogin)
|
||
|
|
d.addErrback(self._ebLogin)
|
||
|
|
self.transport.wont(ECHO).addCallback(login)
|
||
|
|
return 'Discard'
|
||
|
|
|
||
|
|
def _cbLogin(self, ial):
|
||
|
|
interface, protocol, logout = ial
|
||
|
|
assert interface is ITelnetProtocol
|
||
|
|
self.protocol = protocol
|
||
|
|
self.logout = logout
|
||
|
|
self.state = 'Command'
|
||
|
|
|
||
|
|
protocol.makeConnection(self.transport)
|
||
|
|
self.transport.protocol = protocol
|
||
|
|
|
||
|
|
def _ebLogin(self, failure):
|
||
|
|
self.transport.write("\nAuthentication failed\n")
|
||
|
|
self.transport.write("Username: ")
|
||
|
|
self.state = "User"
|
||
|
|
|
||
|
|
__all__ = [
|
||
|
|
# Exceptions
|
||
|
|
'TelnetError', 'NegotiationError', 'OptionRefused',
|
||
|
|
'AlreadyNegotiating', 'AlreadyEnabled', 'AlreadyDisabled',
|
||
|
|
|
||
|
|
# Interfaces
|
||
|
|
'ITelnetProtocol', 'ITelnetTransport',
|
||
|
|
|
||
|
|
# Other stuff, protocols, etc.
|
||
|
|
'Telnet', 'TelnetProtocol', 'TelnetTransport',
|
||
|
|
'TelnetBootstrapProtocol',
|
||
|
|
|
||
|
|
]
|