Subj : openbsd telnet to serial
To   : phigan
From : bbsing
Date : Thu Nov 27 2025 18:01:12

  Re: openbsd telnet to serial
  By: phigan to bbsing on Wed Nov 26 2025 05:43:54

 >   Re: openbsd telnet to serial
 >   By: bbsing to All on Mon Nov 24 2025 09:36 pm
 >
 >  > Does anyone know why the password is shown, and how to get it to not echo wh the user types it in?
 >
 > Have you tried using a raw connection into it instead of telnet? Try this for science.. make sure you have netcat (nc)
 > installed.
 > Create a file called raw.sh with this in it:
 >
 > settings=$(stty -g)
 > stty raw -echo
 > nc $1 $2
 > stty $settings
 >
 > then 'chmod +x raw.sh' and then './raw.sh ipaddress port'. Just one thing to note, when you finally disconnect, you need to hit
 > a
 > key to return to your prompt.
 >
 > The reason for this is telnet does some negotiation on connect, and you're not running telnetd. Your client says "Hey, let's
 > agree
 > on some stuff!" but your server isn't listening for that.
 >

OK this was interesting. The password did not appear when I typed it. The username did, but  not the password. I don't udnerstand why when I hook the serial port of my modem up directly to getty and its identified as a dialin device it does this.

netcat worked how I wanted it to.

Why does the behavior change using telnet vs netcat's raw connection.

NOTE: I switch from openbsd to freebsd because there is no inetd server, or telnetd server with openbsd.


FreeBSD/amd64 (dad) (ttyu0)

login: CONNECT

Password:
Login incorrect
login: bbsing
Password:
Last login: Wed Nov 26 17:32:27 on ttyu0
FreeBSD 14.3-RELEASE-p5 GENERIC


:) :)

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