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`r0c` telnet server

retr0chat, irc-like chat service for superthin clients (on PyPI)
MIT-Licensed, 2018-01-07, ed @ irc.rizon.net
windows telnet 360 noscope <- good video

download the latest release (standalone): r0c.py

summary

imagine being stuck on ancient gear, in the middle of nowhere, on a slow connection between machines that are even more archaic than the toaster you're trying to keep from falling apart

retr0chat is the lightweight, no-dependencies, runs-anywhere solution for when life gives you lemons

tries to be irssi
zero dependencies on python 2.6, 2.7, 3.x
supports telnet, netcat, /dev/tcp clients
fallbacks for inhumane conditions
- linemode
- no vt100 / ansi escape codes

features

irc-like:

public channels with persistent history (pgup/pgdn)
private messages (/msg acidburn hey)
nick completion with Tab ↹
notifications (bell/visual) on hilights and PMs
command subset (/nick, /join, /part, /names, /topic, /me)
inline message coloring, see /help

technical:

client behavior detection (echo, colors, charset, newline)
message input with readline-like editing (arrow-left/right, home/end, backspace)
- history of sent messages (arrow-up/down)
bandwidth-conservative (push/pop lines instead of full redraws; scroll-regions)

windows clients

use putty in telnet mode
or the powershell client
or enable Telnet Client in control panel -> programs -> programs and features -> turn windows features on or off, then press WIN+R and run telnet r0c.int

putty is the best option;

windows-telnet has a bug (since win7) where unicode letters become unstable the more text you have on the screen (starts flickering and then disappear one by one)
the powershell client is no longer spammy as of windows 10.0.15063 (win10 1703 / LTSC)

linux clients

most to least recommended

client	example
telnet	`telnet r0c.int`
socat	`socat -,raw,echo=0 tcp:r0c.int:531`
bash	mostly internals
netcat	`nc r0c.int 531`

you can even exec 147<>/dev/tcp/r0c.int/531;cat<&147&while IFS= read -rn1 x;do [ -z "$x" ]&&x=$'\n';printf %s "$x">&147;done (disconnect using exec 147<&-; killall cat #sorry)

firewall rules

telnet uses port 23 by default, so on the server you'll want to port-forward 23 to 2323 (and 531 to 1531 for plaintext):

iptables -A INPUT -p tcp --dport 23 -m state --state NEW -j ACCEPT
iptables -A INPUT -p tcp --dport 531 -m state --state NEW -j ACCEPT
iptables -A INPUT -p tcp --dport 2323 -m state --state NEW -j ACCEPT
iptables -A INPUT -p tcp --dport 1531 -m state --state NEW -j ACCEPT
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 23 -j REDIRECT --to-port 2323
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 531 -j REDIRECT --to-port 1531

documentation

not really but there is a list of commands and a list of hotkeys

3.2 KiB Raw Blame History

r0c telnet server