Bugzilla – Bug 44
display problems with sudo on sco openserver
Last modified: 2004-08-05 21:45:14 MDT
when running sudo from ptty (via telnet or ssh) sudo does not echo "Password" prompt. It does not echo the prompt until after the command is executed & sudo turns back on the local echo. It works fine from local console. We attempted to create a shell script that would "echo -n..." a Password prompt, but it would not echo until _after_ the execution of the sudo command. We created a break point in sudo right before it executes the password request routine and had it just exit(0), and then all prompts worked OK. This has been tested on sco 5.0.5, and we will try again on a 5.0.6 machine later this week.
That's very strange indeed. It sounds like a buffering problen but sudo doesn't use stdio so that should not be an issue. I suppose you could try changing the TCSAFLUSH in tgetpass.c to TCSADRAIN or TCSANOW and see if that makes a difference. This assumes that HAVE_TERMIOS_H is defined in config.h. If not (which would be surprising try changing the TCSETA in tgetpass.c to TCSETAF.
The prompt writing was changed to be after echo is turned off (instead of before) in sudo 1.6.7, which could possibly help things. Since I have no access to a machine running SCO, this bug report is from sudo 1.6.3, and it sounds like a bug in SCO's pty handling I am going to close it. We can open it again later if you wish to try an debug the issue with a newer version of sudo.