"""Telnet functions and constants for the mudpy engine."""
-# Copyright (c) 2004-2018 mudpy authors. Permission to use, copy,
+# Copyright (c) 2004-2020 mudpy authors. Permission to use, copy,
# modify, and distribute this software is granted under terms
# provided in the LICENSE file distributed with this software.
TELOPT_LINEMODE: "line mode",
}
-# TODO(fungi): implement support for RFC 1091 terminal type information
supported = (
TELOPT_BINARY,
TELOPT_ECHO,
TELOPT_SGA,
+ TELOPT_TTYPE,
TELOPT_EOR,
TELOPT_NAWS,
TELOPT_LINEMODE
US: "us",
}
+# RFC 1091 commands
+IS = 0
+SEND = 1
+ttype_command_names = {
+ IS: "is",
+ SEND: "send",
+}
+
def log(message, user):
"""Log debugging info for Telnet client/server interactions."""
def translate_action(*command):
"""Convert a Telnet command sequence into text suitable for logging."""
- return "%s %s" % (command_names[command[0]], option_names[command[1]])
+ try:
+ command_name = command_names[command[0]]
+ except KeyError:
+ # This should never happen since we filter unknown commands from
+ # the input queue, but added here for completeness since logging
+ # should never crash the process
+ command_name = str(command[0])
+ try:
+ option_name = option_names[command[1]]
+ except KeyError:
+ # This can happen for any of the myriad of Telnet options missing
+ # from the option_names dict
+ option_name = str(command[1])
+ return "%s %s" % (command_name, option_name)
def send_command(user, *command):
user.telopts[(telopt, party)] = WANTNO
+def request_ttype(user):
+ """Clear and request the terminal type."""
+
+ # only actually request if the corresponding telopt is enabled
+ if is_enabled(user, TELOPT_TTYPE, HIM):
+ # set to the empty string to indicate it's been requested
+ user.ttype = ""
+ user.send(telnet_proto(IAC, SB, TELOPT_TTYPE, SEND, IAC, SE), raw=True)
+ log('Sent terminal type request to', user)
+
+
def negotiate_telnet_options(user):
"""Reply to and remove telnet negotiation options from partial_input."""
# make a local copy to play with
text = user.partial_input
- # start at the begining of the input
+ # start at the beginning of the input
position = 0
# as long as we haven't checked it all
# subnegotiation options
elif len_text > position + 4 and command is SB:
telopt = text[position + 2]
- if telopt is TELOPT_NAWS:
- user.columns = (
- text[position + 3] * 256 + text[position + 4])
end_subnegotiation = text.find(telnet_proto(IAC, SE), position)
if end_subnegotiation > 0:
+ if telopt is TELOPT_NAWS:
+ user.columns = (
+ text[position + 3] * 256 + text[position + 4])
+ user.rows = (
+ text[position + 5] * 256 + text[position + 6])
+ elif telopt is TELOPT_TTYPE and text[position + 3] is IS:
+ user.ttype = (
+ text[position + 4:end_subnegotiation]).decode("ascii")
text = text[:position] + text[end_subnegotiation + 2:]
else:
position += 1
log("Ignored unknown command %s from" % command, user)
text = text[:position] + text[position + 2:]
- # and this means we got the begining of an IAC
+ # and this means we got the beginning of an IAC
else:
position += 1