telnetlib.Telnet does not process DATA MARK (DM)

[norbertb]

BPO	1737737
Nosy	@jackdied

^{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 = 'https://github.com/jackdied'
closed_at = <Date 2009-04-06.02:25:13.292>
created_at = <Date 2007-06-15.09:59:07.000>
labels = ['extension-modules', 'invalid']
title = 'telnetlib.Telnet does not process DATA MARK (DM)'
updated_at = <Date 2009-04-06.02:25:13.290>
user = 'https://bugs.python.org/norbertb'

bugs.python.org fields:

activity = <Date 2009-04-06.02:25:13.290>
actor = 'jackdied'
assignee = 'jackdied'
closed = True
closed_date = <Date 2009-04-06.02:25:13.292>
closer = 'jackdied'
components = ['Extension Modules']
creation = <Date 2007-06-15.09:59:07.000>
creator = 'norbert_b'
dependencies = []
files = []
hgrepos = []
issue_num = 1737737
keywords = []
message_count = 3.0
messages = ['32331', '85041', '85607']
nosy_count = 2.0
nosy_names = ['jackdied', 'norbert_b']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1737737'
versions = []

[norbertb]

According to RFC854, the DATA MARK (DM, character code 0xf2) is a control character of the TELNET protocol that should be removed from the input stream (see 'THE TELNET "SYNCH" SIGNAL' in RFC854). Unfortunately the telnetlib.Telnet implementation shipped with Python version 2.5 simply passes the DM char through..

[jackdied]

assigning all open telnetlib items to myself

[jackdied]

RFC 854 says that DM, like all other commands, is only valid when
preceded by an IAC. telnetlib does filter these out appropriately (I
just added tests for it in r71302 and it behaves appropriately).