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authorKevin Lange <k@dakko.us>2011-11-30 17:12:57 -0600
committerKevin Lange <k@dakko.us>2011-11-30 17:12:57 -0600
commitf78de8320de533094e20e32e9f3f408905956e34 (patch)
treecdbaea67b32678700a92612cc37a79583c2ee4c2
parent7d0c23406b3d58bdeb467025198d89f5efea884d (diff)
downloadnyancat-f78de8320de533094e20e32e9f3f408905956e34.tar.gz
Telnet server
-rw-r--r--.gitignore1
-rw-r--r--nyancat.c1
-rwxr-xr-xnyancat.py30
-rw-r--r--telnetsrvlib.py776
4 files changed, 808 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
index 479a0ef..fb2d10d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
nyancat
+*.pyc
diff --git a/nyancat.c b/nyancat.c
index 055f5ba..25db66c 100644
--- a/nyancat.c
+++ b/nyancat.c
@@ -827,6 +827,7 @@ char ** frames[] = {
int main(int argc, char ** argv) {
printf("\033[H\033[2J");
+ fflush(stdout);
try_again:
printf("Select a mode:\n");
printf(" 1 xterm 256-color compatible mode (best)\n");
diff --git a/nyancat.py b/nyancat.py
new file mode 100755
index 0000000..ebeb303
--- /dev/null
+++ b/nyancat.py
@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+import SocketServer
+from subprocess import Popen, PIPE
+from telnetsrvlib import TelnetHandler
+
+class TNS(SocketServer.TCPServer):
+ allow_reuse_address = True
+
+class TNH(TelnetHandler):
+ def handle(self):
+ print self.TERM
+ p = Popen(["./nyancat"], shell=False, stdout=PIPE, stdin=PIPE, bufsize=0)
+ if (self.TERM.lower().find("xterm") != -1):
+ p.stdin.write("1\n")
+ elif (self.TERM.lower().find("linux") != -1):
+ p.stdin.write("3\n")
+ elif (self.TERM.lower().find("fallback") != -1):
+ p.stdin.write("4\n")
+ else:
+ p.stdin.write("2\n")
+ while 1:
+ s = p.stdout.read(1)
+ try:
+ self.write(s)
+ except:
+ p.kill()
+ return
+
+tns = TNS(("0.0.0.0", 23), TNH)
+tns.serve_forever()
diff --git a/telnetsrvlib.py b/telnetsrvlib.py
new file mode 100644
index 0000000..14b9b2f
--- /dev/null
+++ b/telnetsrvlib.py
@@ -0,0 +1,776 @@
+#!/usr/bin/python
+"""TELNET server class
+
+Based on the telnet client in telnetlib.py
+
+Presents a command line interface to the telnet client.
+Various settings can affect the operation of the server:
+
+ authCallback = Reference to authentication function. If
+ there is none, no un/pw is requested. Should
+ raise an exception if authentication fails
+ Default: None
+ authNeedUser = Should a username be requested?
+ Default: False
+ authNeedPass = Should a password be requested?
+ Default: False
+ COMMANDS = Dictionary of supported commands
+ Key = command (Must be upper case)
+ Value = List of (function, help text)
+ Function.__doc__ should be long help
+ Function.aliases may be a list of alternative spellings
+"""
+
+#from telnetlib import IAC, WILL, WONT, DO, DONT, ECHO, SGA, Telnet
+import threading
+import SocketServer
+import socket
+import time
+import sys
+import traceback
+import curses.ascii
+import curses.has_key
+import curses
+import logging
+import re
+if not hasattr(socket, 'SHUT_RDWR'):
+ socket.SHUT_RDWR = 2
+
+__all__ = ["TelnetHandler", "TelnetCLIHandler"]
+
+IAC = chr(255) # "Interpret As Command"
+DONT = chr(254)
+DO = chr(253)
+WONT = chr(252)
+WILL = chr(251)
+theNULL = chr(0)
+
+SE = chr(240) # Subnegotiation End
+NOP = chr(241) # No Operation
+DM = chr(242) # Data Mark
+BRK = chr(243) # Break
+IP = chr(244) # Interrupt process
+AO = chr(245) # Abort output
+AYT = chr(246) # Are You There
+EC = chr(247) # Erase Character
+EL = chr(248) # Erase Line
+GA = chr(249) # Go Ahead
+SB = chr(250) # Subnegotiation Begin
+
+BINARY = chr(0) # 8-bit data path
+ECHO = chr(1) # echo
+RCP = chr(2) # prepare to reconnect
+SGA = chr(3) # suppress go ahead
+NAMS = chr(4) # approximate message size
+STATUS = chr(5) # give status
+TM = chr(6) # timing mark
+RCTE = chr(7) # remote controlled transmission and echo
+NAOL = chr(8) # negotiate about output line width
+NAOP = chr(9) # negotiate about output page size
+NAOCRD = chr(10) # negotiate about CR disposition
+NAOHTS = chr(11) # negotiate about horizontal tabstops
+NAOHTD = chr(12) # negotiate about horizontal tab disposition
+NAOFFD = chr(13) # negotiate about formfeed disposition
+NAOVTS = chr(14) # negotiate about vertical tab stops
+NAOVTD = chr(15) # negotiate about vertical tab disposition
+NAOLFD = chr(16) # negotiate about output LF disposition
+XASCII = chr(17) # extended ascii character set
+LOGOUT = chr(18) # force logout
+BM = chr(19) # byte macro
+DET = chr(20) # data entry terminal
+SUPDUP = chr(21) # supdup protocol
+SUPDUPOUTPUT = chr(22) # supdup output
+SNDLOC = chr(23) # send location
+TTYPE = chr(24) # terminal type
+EOR = chr(25) # end or record
+TUID = chr(26) # TACACS user identification
+OUTMRK = chr(27) # output marking
+TTYLOC = chr(28) # terminal location number
+VT3270REGIME = chr(29) # 3270 regime
+X3PAD = chr(30) # X.3 PAD
+NAWS = chr(31) # window size
+TSPEED = chr(32) # terminal speed
+LFLOW = chr(33) # remote flow control
+LINEMODE = chr(34) # Linemode option
+XDISPLOC = chr(35) # X Display Location
+OLD_ENVIRON = chr(36) # Old - Environment variables
+AUTHENTICATION = chr(37) # Authenticate
+ENCRYPT = chr(38) # Encryption option
+NEW_ENVIRON = chr(39) # New - Environment variables
+# the following ones come from
+# http://www.iana.org/assignments/telnet-options
+# Unfortunately, that document does not assign identifiers
+# to all of them, so we are making them up
+TN3270E = chr(40) # TN3270E
+XAUTH = chr(41) # XAUTH
+CHARSET = chr(42) # CHARSET
+RSP = chr(43) # Telnet Remote Serial Port
+COM_PORT_OPTION = chr(44) # Com Port Control Option
+SUPPRESS_LOCAL_ECHO = chr(45) # Telnet Suppress Local Echo
+TLS = chr(46) # Telnet Start TLS
+KERMIT = chr(47) # KERMIT
+SEND_URL = chr(48) # SEND-URL
+FORWARD_X = chr(49) # FORWARD_X
+PRAGMA_LOGON = chr(138) # TELOPT PRAGMA LOGON
+SSPI_LOGON = chr(139) # TELOPT SSPI LOGON
+PRAGMA_HEARTBEAT = chr(140) # TELOPT PRAGMA HEARTBEAT
+EXOPL = chr(255) # Extended-Options-List
+NOOPT = chr(0)
+
+#Codes used in SB SE data stream for terminal type negotiation
+IS = chr(0)
+SEND = chr(1)
+
+CMDS = {
+ WILL: 'WILL',
+ WONT: 'WONT',
+ DO: 'DO',
+ DONT: 'DONT',
+ SE: 'Subnegotiation End',
+ NOP: 'No Operation',
+ DM: 'Data Mark',
+ BRK: 'Break',
+ IP: 'Interrupt process',
+ AO: 'Abort output',
+ AYT: 'Are You There',
+ EC: 'Erase Character',
+ EL: 'Erase Line',
+ GA: 'Go Ahead',
+ SB: 'Subnegotiation Begin',
+ BINARY: 'Binary',
+ ECHO: 'Echo',
+ RCP: 'Prepare to reconnect',
+ SGA: 'Suppress Go-Ahead',
+ NAMS: 'Approximate message size',
+ STATUS: 'Give status',
+ TM: 'Timing mark',
+ RCTE: 'Remote controlled transmission and echo',
+ NAOL: 'Negotiate about output line width',
+ NAOP: 'Negotiate about output page size',
+ NAOCRD: 'Negotiate about CR disposition',
+ NAOHTS: 'Negotiate about horizontal tabstops',
+ NAOHTD: 'Negotiate about horizontal tab disposition',
+ NAOFFD: 'Negotiate about formfeed disposition',
+ NAOVTS: 'Negotiate about vertical tab stops',
+ NAOVTD: 'Negotiate about vertical tab disposition',
+ NAOLFD: 'Negotiate about output LF disposition',
+ XASCII: 'Extended ascii character set',
+ LOGOUT: 'Force logout',
+ BM: 'Byte macro',
+ DET: 'Data entry terminal',
+ SUPDUP: 'Supdup protocol',
+ SUPDUPOUTPUT: 'Supdup output',
+ SNDLOC: 'Send location',
+ TTYPE: 'Terminal type',
+ EOR: 'End or record',
+ TUID: 'TACACS user identification',
+ OUTMRK: 'Output marking',
+ TTYLOC: 'Terminal location number',
+ VT3270REGIME: '3270 regime',
+ X3PAD: 'X.3 PAD',
+ NAWS: 'Window size',
+ TSPEED: 'Terminal speed',
+ LFLOW: 'Remote flow control',
+ LINEMODE: 'Linemode option',
+ XDISPLOC: 'X Display Location',
+ OLD_ENVIRON: 'Old - Environment variables',
+ AUTHENTICATION: 'Authenticate',
+ ENCRYPT: 'Encryption option',
+ NEW_ENVIRON: 'New - Environment variables',
+}
+
+class TelnetHandler(SocketServer.BaseRequestHandler):
+ "A telnet server based on the client in telnetlib"
+
+ # What I am prepared to do?
+ DOACK = {
+ ECHO: WILL,
+ SGA: WILL,
+ NEW_ENVIRON: WONT,
+ }
+ # What do I want the client to do?
+ WILLACK = {
+ ECHO: DONT,
+ SGA: DO,
+ NAWS: DONT,
+ TTYPE: DO,
+ LINEMODE: DONT,
+ NEW_ENVIRON: DO,
+ }
+ # Default terminal type - used if client doesn't tell us its termtype
+ TERM = "ansi"
+ # Keycode to name mapping - used to decide which keys to query
+ KEYS = { # Key escape sequences
+ curses.KEY_UP: 'Up', # Cursor up
+ curses.KEY_DOWN: 'Down', # Cursor down
+ curses.KEY_LEFT: 'Left', # Cursor left
+ curses.KEY_RIGHT: 'Right', # Cursor right
+ curses.KEY_DC: 'Delete', # Delete right
+ curses.KEY_BACKSPACE: 'Backspace', # Delete left
+ }
+ # Reverse mapping of KEYS - used for cooking key codes
+ ESCSEQ = {
+ }
+ # Terminal output escape sequences
+ CODES = {
+ 'DEOL': '', # Delete to end of line
+ 'DEL': '', # Delete and close up
+ 'INS': '', # Insert space
+ 'CSRLEFT': '', # Move cursor left 1 space
+ 'CSRRIGHT': '', # Move cursor right 1 space
+ }
+ # What prompt to display
+ PROMPT = "Telnet Server> "
+ # The function to call to verify authentication data
+ authCallback = None
+ # Does authCallback want a username?
+ authNeedUser = False
+ # Does authCallback want a password?
+ authNeedPass = False
+
+# --------------------------- Environment Setup ----------------------------
+
+ def __init__(self, request, client_address, server):
+ """Constructor.
+
+ When called without arguments, create an unconnected instance.
+ With a hostname argument, it connects the instance; a port
+ number is optional.
+ """
+ # Am I doing the echoing?
+ self.DOECHO = True
+ # What opts have I sent DO/DONT for and what did I send?
+ self.DOOPTS = {}
+ # What opts have I sent WILL/WONT for and what did I send?
+ self.WILLOPTS = {}
+ # What commands does this CLI support
+ self.COMMANDS = {}
+ self.sock = None # TCP socket
+ self.rawq = '' # Raw input string
+ self.cookedq = [] # This is the cooked input stream (list of charcodes)
+ self.sbdataq = '' # Sub-Neg string
+ self.eof = 0 # Has EOF been reached?
+ self.iacseq = '' # Buffer for IAC sequence.
+ self.sb = 0 # Flag for SB and SE sequence.
+ self.history = [] # Command history
+ self.IQUEUELOCK = threading.Lock()
+ self.OQUEUELOCK = threading.Lock()
+ self.RUNSHELL = True
+ # A little magic - Everything called cmdXXX is a command
+ for k in dir(self):
+ if k[:3] == 'cmd':
+ name = k[3:]
+ method = getattr(self, k)
+ self.COMMANDS[name] = method
+ for alias in getattr(method, "aliases", []):
+ self.COMMANDS[alias] = self.COMMANDS[name]
+ SocketServer.BaseRequestHandler.__init__(self, request, client_address, server)
+
+ def setterm(self, term):
+ "Set the curses structures for this terminal"
+ logging.debug("Setting termtype to %s" % (term, ))
+ curses.setupterm(term) # This will raise if the termtype is not supported
+ self.TERM = term
+ self.ESCSEQ = {}
+ for k in self.KEYS.keys():
+ str = curses.tigetstr(curses.has_key._capability_names[k])
+ if str:
+ self.ESCSEQ[str] = k
+ self.CODES['DEOL'] = curses.tigetstr('el')
+ self.CODES['DEL'] = curses.tigetstr('dch1')
+ self.CODES['INS'] = curses.tigetstr('ich1')
+ self.CODES['CSRLEFT'] = curses.tigetstr('cub1')
+ self.CODES['CSRRIGHT'] = curses.tigetstr('cuf1')
+
+ def setup(self):
+ "Connect incoming connection to a telnet session"
+ self.setterm(self.TERM)
+ self.sock = self.request._sock
+ for k in self.DOACK.keys():
+ self.sendcommand(self.DOACK[k], k)
+ for k in self.WILLACK.keys():
+ self.sendcommand(self.WILLACK[k], k)
+ self.thread_ic = threading.Thread(target=self.inputcooker)
+ self.thread_ic.setDaemon(True)
+ self.thread_ic.start()
+ # Sleep for 0.5 second to allow options negotiation
+ time.sleep(0.5)
+
+ def finish(self):
+ "End this session"
+ self.sock.shutdown(socket.SHUT_RDWR)
+
+# ------------------------- Telnet Options Engine --------------------------
+
+ def options_handler(self, sock, cmd, opt):
+ "Negotiate options"
+# if CMDS.has_key(cmd):
+# cmdtxt = CMDS[cmd]
+# else:
+# cmdtxt = "cmd:%d" % ord(cmd)
+# if cmd in [WILL, WONT, DO, DONT]:
+# if CMDS.has_key(opt):
+# opttxt = CMDS[opt]
+# else:
+# opttxt = "opt:%d" % ord(opt)
+# else:
+# opttxt = ""
+# logging.debug("OPTION: %s %s" % (cmdtxt, opttxt, ))
+ if cmd == NOP:
+ self.sendcommand(NOP)
+ elif cmd == WILL or cmd == WONT:
+ if self.WILLACK.has_key(opt):
+ self.sendcommand(self.WILLACK[opt], opt)
+ else:
+ self.sendcommand(DONT, opt)
+ if cmd == WILL and opt == TTYPE:
+ self.writecooked(IAC + SB + TTYPE + SEND + IAC + SE)
+ elif cmd == DO or cmd == DONT:
+ if self.DOACK.has_key(opt):
+ self.sendcommand(self.DOACK[opt], opt)
+ else:
+ self.sendcommand(WONT, opt)
+ if opt == ECHO:
+ self.DOECHO = (cmd == DO)
+ elif cmd == SE:
+ subreq = self.read_sb_data()
+ if subreq[0] == TTYPE and subreq[1] == IS:
+ try:
+ self.setterm(subreq[2:])
+ except:
+ logging.debug("Terminal type not known")
+ elif cmd == SB:
+ pass
+ else:
+ logging.debug("Unhandled option: %s %s" % (cmdtxt, opttxt, ))
+
+ def sendcommand(self, cmd, opt=None):
+ "Send a telnet command (IAC)"
+# if CMDS.has_key(cmd):
+# cmdtxt = CMDS[cmd]
+# else:
+# cmdtxt = "cmd:%d" % ord(cmd)
+# if opt == None:
+# opttxt = ''
+# else:
+# if CMDS.has_key(opt):
+# opttxt = CMDS[opt]
+# else:
+# opttxt = "opt:%d" % ord(opt)
+ if cmd in [DO, DONT]:
+ if not self.DOOPTS.has_key(opt):
+ self.DOOPTS[opt] = None
+ if (((cmd == DO) and (self.DOOPTS[opt] != True))
+ or ((cmd == DONT) and (self.DOOPTS[opt] != False))):
+# logging.debug("Sending %s %s" % (cmdtxt, opttxt, ))
+ self.DOOPTS[opt] = (cmd == DO)
+ self.writecooked(IAC + cmd + opt)
+# else:
+# logging.debug("Not resending %s %s" % (cmdtxt, opttxt, ))
+ elif cmd in [WILL, WONT]:
+ if not self.WILLOPTS.has_key(opt):
+ self.WILLOPTS[opt] = ''
+ if (((cmd == WILL) and (self.WILLOPTS[opt] != True))
+ or ((cmd == WONT) and (self.WILLOPTS[opt] != False))):
+# logging.debug("Sending %s %s" % (cmdtxt, opttxt, ))
+ self.WILLOPTS[opt] = (cmd == WILL)
+ self.writecooked(IAC + cmd + opt)
+# else:
+# logging.debug("Not resending %s %s" % (cmdtxt, opttxt, ))
+ else:
+ self.writecooked(IAC + cmd)
+
+ def read_sb_data(self):
+ """Return any data available in the SB ... SE queue.
+
+ Return '' if no SB ... SE available. Should only be called
+ after seeing a SB or SE command. When a new SB command is
+ found, old unread SB data will be discarded. Don't block.
+
+ """
+ buf = self.sbdataq
+ self.sbdataq = ''
+ return buf
+
+# ---------------------------- Input Functions -----------------------------
+
+ def _readline_echo(self, char, echo):
+ """Echo a recieved character, move cursor etc..."""
+ if echo == True or (echo == None and self.DOECHO == True):
+ self.write(char)
+
+ def readline(self, echo=None):
+ """Return a line of text, including the terminating LF
+ If echo is true always echo, if echo is false never echo
+ If echo is None follow the negotiated setting.
+ """
+ line = []
+ insptr = 0
+ histptr = len(self.history)
+ while True:
+ c = self.getc(block=True)
+ if c == theNULL:
+ continue
+ elif c == curses.KEY_LEFT:
+ if insptr > 0:
+ insptr = insptr - 1
+ self._readline_echo(self.CODES['CSRLEFT'], echo)
+ else:
+ self._readline_echo(chr(7), echo)
+ continue
+ elif c == curses.KEY_RIGHT:
+ if insptr < len(line):
+ insptr = insptr + 1
+ self._readline_echo(self.CODES['CSRRIGHT'], echo)
+ else:
+ self._readline_echo(chr(7), echo)
+ continue
+ elif c == curses.KEY_UP or c == curses.KEY_DOWN:
+ if c == curses.KEY_UP:
+ if histptr > 0:
+ histptr = histptr - 1
+ else:
+ self._readline_echo(chr(7), echo)
+ continue
+ elif c == curses.KEY_DOWN:
+ if histptr < len(self.history):
+ histptr = histptr + 1
+ else:
+ self._readline_echo(chr(7), echo)
+ continue
+ line = []
+ if histptr < len(self.history):
+ line.extend(self.history[histptr])
+ for char in range(insptr):
+ self._readline_echo(self.CODES['CSRLEFT'], echo)
+ self._readline_echo(self.CODES['DEOL'], echo)
+ self._readline_echo(''.join(line), echo)
+ insptr = len(line)
+ continue
+ elif c == chr(3):
+ self._readline_echo('\n' + curses.ascii.unctrl(c) + ' ABORT\n', echo)
+ return ''
+ elif c == chr(4):
+ if len(line) > 0:
+ self._readline_echo('\n' + curses.ascii.unctrl(c) + ' ABORT (QUIT)\n', echo)
+ return ''
+ self._readline_echo('\n' + curses.ascii.unctrl(c) + ' QUIT\n', echo)
+ return 'QUIT'
+ elif c == chr(10):
+ self._readline_echo(c, echo)
+ if echo == True or (echo == None and self.DOECHO == True):
+ self.history.append(line)
+ return ''.join(line)
+ elif c == curses.KEY_BACKSPACE or c == chr(127) or c == chr(8):
+ if insptr > 0:
+ self._readline_echo(self.CODES['CSRLEFT'] + self.CODES['DEL'], echo)
+ insptr = insptr - 1
+ del line[insptr]
+ else:
+ self._readline_echo(chr(7), echo)
+ continue
+ elif c == curses.KEY_DC:
+ if insptr < len(line):
+ self._readline_echo(self.CODES['DEL'], echo)
+ del line[insptr]
+ else:
+ self._readline_echo(chr(7), echo)
+ continue
+ else:
+ if ord(c) < 32:
+ c = curses.ascii.unctrl(c)
+ self._readline_echo(c, echo)
+ line[insptr:insptr] = c
+ insptr = insptr + len(c)
+
+ def getc(self, block=True):
+ """Return one character from the input queue"""
+ if not block:
+ if not len(self.cookedq):
+ return ''
+ while not len(self.cookedq):
+ time.sleep(0.05)
+ self.IQUEUELOCK.acquire()
+ ret = self.cookedq[0]
+ self.cookedq = self.cookedq[1:]
+ self.IQUEUELOCK.release()
+ return ret
+
+# --------------------------- Output Functions -----------------------------
+
+ def writeline(self, text):
+ """Send a packet with line ending."""
+ self.write(text+chr(10))
+
+ def write(self, text):
+ """Send a packet to the socket. This function cooks output."""
+ text = text.replace(IAC, IAC+IAC)
+ text = text.replace(chr(10), chr(13)+chr(10))
+ self.writecooked(text)
+
+ def writecooked(self, text):
+ """Put data directly into the output queue (bypass output cooker)"""
+ self.OQUEUELOCK.acquire()
+ self.sock.sendall(text)
+ self.OQUEUELOCK.release()
+
+# ------------------------------- Input Cooker -----------------------------
+
+ def _inputcooker_getc(self, block=True):
+ """Get one character from the raw queue. Optionally blocking.
+ Raise EOFError on end of stream. SHOULD ONLY BE CALLED FROM THE
+ INPUT COOKER."""
+ if self.rawq:
+ ret = self.rawq[0]
+ self.rawq = self.rawq[1:]
+ return ret
+ if not block:
+ if select.select([self.sock.fileno()], [], [], 0) == ([], [], []):
+ return ''
+ ret = self.sock.recv(20)
+ self.eof = not(ret)
+ self.rawq = self.rawq + ret
+ if self.eof:
+ raise EOFError
+ return self._inputcooker_getc(block)
+
+ def _inputcooker_ungetc(self, char):
+ """Put characters back onto the head of the rawq. SHOULD ONLY
+ BE CALLED FROM THE INPUT COOKER."""
+ self.rawq = char + self.rawq
+
+ def _inputcooker_store(self, char):
+ """Put the cooked data in the correct queue (with locking)"""
+ if self.sb:
+ self.sbdataq = self.sbdataq + char
+ else:
+ self.IQUEUELOCK.acquire()
+ if type(char) in [type(()), type([]), type("")]:
+ for v in char:
+ self.cookedq.append(v)
+ else:
+ self.cookedq.append(char)
+ self.IQUEUELOCK.release()
+
+ def inputcooker(self):
+ """Input Cooker - Transfer from raw queue to cooked queue.
+
+ Set self.eof when connection is closed. Don't block unless in
+ the midst of an IAC sequence.
+ """
+ try:
+ while True:
+ c = self._inputcooker_getc()
+ if not self.iacseq:
+ if c == IAC:
+ self.iacseq += c
+ continue
+ elif c == chr(13) and not(self.sb):
+ c2 = self._inputcooker_getc(block=False)
+ if c2 == theNULL or c2 == '':
+ c = chr(10)
+ elif c2 == chr(10):
+ c = c2
+ else:
+ self._inputcooker_ungetc(c2)
+ c = chr(10)
+ elif c in [x[0] for x in self.ESCSEQ.keys()]:
+ 'Looks like the begining of a key sequence'
+ codes = c
+ for keyseq in self.ESCSEQ.keys():
+ if len(keyseq) == 0:
+ continue
+ while codes == keyseq[:len(codes)] and len(codes) <= keyseq:
+ if codes == keyseq:
+ c = self.ESCSEQ[keyseq]
+ break
+ codes = codes + self._inputcooker_getc()
+ if codes == keyseq:
+ break
+ self._inputcooker_ungetc(codes[1:])
+ codes = codes[0]
+ self._inputcooker_store(c)
+ elif len(self.iacseq) == 1:
+ 'IAC: IAC CMD [OPTION only for WILL/WONT/DO/DONT]'
+ if c in (DO, DONT, WILL, WONT):
+ self.iacseq += c
+ continue
+ self.iacseq = ''
+ if c == IAC:
+ self._inputcooker_store(c)
+ else:
+ if c == SB: # SB ... SE start.
+ self.sb = 1
+ self.sbdataq = ''
+ # continue
+ elif c == SE: # SB ... SE end.
+ self.sb = 0
+ # Callback is supposed to look into
+ # the sbdataq
+ self.options_handler(self.sock, c, NOOPT)
+ elif len(self.iacseq) == 2:
+ cmd = self.iacseq[1]
+ self.iacseq = ''
+ if cmd in (DO, DONT, WILL, WONT):
+ self.options_handler(self.sock, cmd, c)
+ except EOFError:
+ pass
+
+# ------------------------------- Basic Commands ---------------------------
+
+# Format of docstrings for command methods:
+# Line 0: Command paramater(s) if any. (Can be blank line)
+# Line 1: Short descriptive text. (Mandatory)
+# Line 2+: Long descriptive text. (Can be blank line)
+
+ def cmdHELP(self, params):
+ """[<command>]
+ Display help
+ Display either brief help on all commands, or detailed
+ help on a single command passed as a parameter.
+ """
+ if params:
+ cmd = params[0].upper()
+ if self.COMMANDS.has_key(cmd):
+ method = self.COMMANDS[cmd]
+ doc = method.__doc__.split("\n")
+ docp = doc[0].strip()
+ docl = '\n'.join(doc[2:]).replace("\n\t\t", " ").replace("\t", "").strip()
+ if len(docl) < 4:
+ docl = doc[1].strip()
+ self.writeline(
+ "%s %s\n\n%s" % (
+ cmd,
+ docp,
+ docl,
+ )
+ )
+ return
+ else:
+ self.writeline("Command '%s' not known" % cmd)
+ else:
+ self.writeline("Help on built in commands\n")
+ keys = self.COMMANDS.keys()
+ keys.sort()
+ for cmd in keys:
+ method = self.COMMANDS[cmd]
+ doc = method.__doc__.split("\n")
+ docp = doc[0].strip()
+ docs = doc[1].strip()
+ if len(docp) > 0:
+ docps = "%s - %s" % (docp, docs, )
+ else:
+ docps = "- %s" % (docs, )
+ self.writeline(
+ "%s %s" % (
+ cmd,
+ docps,
+ )
+ )
+ cmdHELP.aliases = ['?']
+
+ def cmdEXIT(self, params):
+ """
+ Exit the command shell
+ """
+ self.RUNSHELL = False
+ self.writeline("Goodbye")
+ cmdEXIT.aliases = ['QUIT', 'BYE', 'LOGOUT']
+
+ def cmdDEBUG(self, params):
+ """
+ Display some debugging data
+ """
+ for (v,k) in self.ESCSEQ.items():
+ line = '%-10s : ' % (self.KEYS[k], )
+ for c in v:
+ if ord(c)<32 or ord(c)>126:
+ line = line + curses.ascii.unctrl(c)
+ else:
+ line = line + c
+ self.writeline(line)
+
+ def cmdHISTORY(self, params):
+ """
+ Display the command history
+ """
+ cnt = 0
+ self.writeline('Command history\n')
+ for line in self.history:
+ cnt = cnt + 1
+ self.writeline("%-5d : %s" % (cnt, ''.join(line)))
+
+# ----------------------- Command Line Processor Engine --------------------
+
+ def handleException(self, exc_type, exc_param, exc_tb):
+ "Exception handler (False to abort)"
+ self.writeline(traceback.format_exception_only(exc_type, exc_param)[-1])
+ return True
+
+ def handle(self):
+ "The actual service to which the user has connected."
+ username = None
+ password = None
+ if self.authCallback:
+ if self.authNeedUser:
+ if self.DOECHO:
+ self.write("Username: ")
+ username = self.readline()
+ if self.authNeedPass:
+ if self.DOECHO:
+ self.write("Password: ")
+ password = self.readline(echo=False)
+ if self.DOECHO:
+ self.write("\n")
+ try:
+ self.authCallback(username, password)
+ except:
+ return
+ while self.RUNSHELL:
+ if self.DOECHO:
+ self.write(self.PROMPT)
+ cmdlist = [item.strip() for item in self.readline().split()]
+ idx = 0
+ while idx < (len(cmdlist) - 1):
+ if cmdlist[idx][0] in ["'", '"']:
+ cmdlist[idx] = cmdlist[idx] + " " + cmdlist.pop(idx+1)
+ if cmdlist[idx][0] != cmdlist[idx][-1]:
+ continue
+ cmdlist[idx] = cmdlist[idx][1:-1]
+ idx = idx + 1
+ if cmdlist:
+ cmd = cmdlist[0].upper()
+ params = cmdlist[1:]
+ if self.COMMANDS.has_key(cmd):
+ try:
+ self.COMMANDS[cmd](params)
+ except:
+ (t, p, tb) = sys.exc_info()
+ if self.handleException(t, p, tb):
+ break
+ else:
+ self.write("Unknown command '%s'\n" % cmd)
+ logging.debug("Exiting handler")
+
+if __name__ == '__main__':
+ "Testing - Accept a single connection"
+ class TNS(SocketServer.TCPServer):
+ allow_reuse_address = True
+
+ class TNH(TelnetHandler):
+ def cmdECHO(self, params):
+ """ [<arg> ...]
+ Echo parameters
+ Echo command line parameters back to user, one per line.
+ """
+ self.writeline("Parameters:")
+ for item in params:
+ self.writeline("\t%s" % item)
+
+ logging.getLogger('').setLevel(logging.DEBUG)
+
+ tns = TNS(("0.0.0.0", 23), TNH)
+ tns.serve_forever()
+
+# vim: set syntax=python ai showmatch:
+