1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
# $Id: telnet.py 23 2006-11-08 15:45:33Z dugsong $
# -*- coding: utf-8 -*-
"""Telnet."""
from __future__ import print_function
from __future__ import absolute_import
import struct
from .compat import compat_ord
IAC = 255 # interpret as command:
DONT = 254 # you are not to use option
DO = 253 # please, you use option
WONT = 252 # I won't use option
WILL = 251 # I will use option
SB = 250 # interpret as subnegotiation
GA = 249 # you may reverse the line
EL = 248 # erase the current line
EC = 247 # erase the current character
AYT = 246 # are you there
AO = 245 # abort output--but let prog finish
IP = 244 # interrupt process--permanently
BREAK = 243 # break
DM = 242 # data mark--for connect. cleaning
NOP = 241 # nop
SE = 240 # end sub negotiation
EOR = 239 # end of record (transparent mode)
ABORT = 238 # Abort process
SUSP = 237 # Suspend process
xEOF = 236 # End of file: EOF is already used...
SYNCH = 242 # for telfunc calls
def strip_options(buf):
"""Return a list of lines and dict of options from telnet data."""
l = buf.split(struct.pack("B", IAC))
# print l
b = []
d = {}
subopt = False
for w in l:
if not w:
continue
o = compat_ord(w[0])
if o > SB:
# print 'WILL/WONT/DO/DONT/IAC', `w`
w = w[2:]
elif o == SE:
# print 'SE', `w`
w = w[1:]
subopt = False
elif o == SB:
# print 'SB', `w`
subopt = True
for opt in (b'USER', b'DISPLAY', b'TERM'):
p = w.find(opt + b'\x01')
if p != -1:
d[opt] = w[p + len(opt) + 1:].split(b'\x00', 1)[0]
w = None
elif subopt:
w = None
if w:
w = w.replace(b'\x00', b'\n').splitlines()
if not w[-1]: w.pop()
b.extend(w)
return b, d
def test_telnet():
l = []
s = b"\xff\xfb%\xff\xfa%\x00\x00\x00\xff\xf0\xff\xfd&\xff\xfa&\x05\xff\xf0\xff\xfa&\x01\x01\x02\xff\xf0\xff\xfb\x18\xff\xfb \xff\xfb#\xff\xfb'\xff\xfc$\xff\xfa \x0038400,38400\xff\xf0\xff\xfa#\x00doughboy.citi.umich.edu:0.0\xff\xf0\xff\xfa'\x00\x00DISPLAY\x01doughboy.citi.umich.edu:0.0\x00USER\x01dugsong\xff\xf0\xff\xfa\x18\x00XTERM\xff\xf0\xff\xfd\x03\xff\xfc\x01\xff\xfb\x1f\xff\xfa\x1f\x00P\x00(\xff\xf0\xff\xfd\x05\xff\xfb!\xff\xfd\x01fugly\r\x00yoda\r\x00bashtard\r\x00"
l.append(s)
s = b'\xff\xfd\x01\xff\xfd\x03\xff\xfb\x18\xff\xfb\x1f\xff\xfa\x1f\x00X\x002\xff\xf0admin\r\x00\xff\xfa\x18\x00LINUX\xff\xf0foobar\r\x00enable\r\x00foobar\r\x00\r\x00show ip int Vlan 666\r\x00'
l.append(s)
s = b'\xff\xfb%\xff\xfa%\x00\x00\x00\xff\xf0\xff\xfd&\xff\xfa&\x05\xff\xf0\xff\xfa&\x01\x01\x02\xff\xf0\xff\xfb&\xff\xfb\x18\xff\xfb \xff\xfb#\xff\xfb\'\xff\xfc$\xff\xfa \x0038400,38400\xff\xf0\xff\xfa#\x00doughboy.citi.umich.edu:0.0\xff\xf0\xff\xfa\'\x00\x00DISPLAY\x01doughboy.citi.umich.edu:0.0\x00USER\x01dugsong\xff\xf0\xff\xfa\x18\x00XTERM\xff\xf0\xff\xfd\x03\xff\xfc\x01\xff\xfb"\xff\xfa"\x03\x01\x03\x00\x03b\x03\x04\x02\x0f\x05\x00\xff\xff\x07b\x1c\x08\x02\x04\tB\x1a\n\x02\x7f\x0b\x02\x15\x0c\x02\x17\r\x02\x12\x0e\x02\x16\x0f\x02\x11\x10\x02\x13\x11\x00\xff\xff\x12\x00\xff\xff\xff\xf0\xff\xfb\x1f\xff\xfa\x1f\x00P\x00(\xff\xf0\xff\xfd\x05\xff\xfb!\xff\xfa"\x01\x0f\xff\xf0\xff\xfd\x01\xff\xfe\x01\xff\xfa"\x03\x01\x80\x00\xff\xf0\xff\xfd\x01werd\r\n\xff\xfe\x01yoda\r\n\xff\xfd\x01darthvader\r\n\xff\xfe\x01'
l.append(s)
exp = [([b'fugly', b'yoda', b'bashtard'], {b'USER': b'dugsong', b'DISPLAY': b'doughboy.citi.umich.edu:0.0'}),
([b'admin', b'foobar', b'enable', b'foobar', b'', b'show ip int Vlan 666'], {}),
([b'werd', b'yoda', b'darthvader'], {b'USER': b'dugsong', b'DISPLAY': b'doughboy.citi.umich.edu:0.0'})]
assert (list(map(strip_options, l)) == exp)
if __name__ == '__main__':
test_telnet()
print('Tests Successful...')
|
