telnetlib raises UnboundLocalError

[noah]

BPO	593696
Nosy	@terryjreedy

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2002-08-11.20:09:40.000>
created_at = <Date 2002-08-11.16:57:00.000>
labels = ['library']
title = 'telnetlib raises UnboundLocalError'
updated_at = <Date 2002-08-11.20:09:40.000>
user = 'https://bugs.python.org/noah'

bugs.python.org fields:

activity = <Date 2002-08-11.20:09:40.000>
actor = 'nnorwitz'
assignee = 'nnorwitz'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2002-08-11.16:57:00.000>
creator = 'noah'
dependencies = []
files = []
hgrepos = []
issue_num = 593696
keywords = []
message_count = 3.0
messages = ['11907', '11908', '11909']
nosy_count = 3.0
nosy_names = ['nnorwitz', 'terry.reedy', 'noah']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue593696'
versions = ['Python 2.2']

[noah]

I have a tiny test script that causes telnetlib to
crash due to an UnboundLocalError exception.
I tested this on Python 2.2.1 on Linux and OpenBSD.
Here is the uname output of both test machines:
OpenBSD ark2 2.9 GENERIC#653 i386
Linux starship.python.net 2.2.19-6.2.12smp #1 SMP Fri
Oct 26 11:29:57 EDT 2001 i686 unknown

Here is the script:

import telnetlib
tn = telnetlib.Telnet ("surfers.org", 4242)
tn.read_until ("Please enter your name:")
tn.write ("Mongo\n")
tn.read_until ("just connect to Surfers:")

Here is the exact error:

# python term.py
Traceback (most recent call last):
  File "term.py", line 6, in ?
    tn.read_until ("just connect to Surfers:")
  File "/usr/local/lib/python2.2/telnetlib.py", line 297, in 
read_until
    self.process_rawq()
  File "/usr/local/lib/python2.2/telnetlib.py", line 424, in 
process_rawq
    self.msg('IAC %d not recognized' % ord(opt))
UnboundLocalError: local variable 'opt' referenced before 
assignment

Let me know if I can provide more information.

Yours,
Noah

[terryjreedy]

Logged In: YES
user_id=593130

This appears to be trivial fix in telnetlib.py, line 424:
self.msg('IAC %d not recognized' % ord(opt))
I believe 'opt' should be changed to 'c' since it is c that is
not recognized in the if-elif series above this line. Opt is
only set for certain values of c.

[nnorwitz]

Logged In: YES
user_id=33168

Checked in as 1.16.10.2.
Thanks!