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#!/usr/bin/env bash
# gates-of-tartaros – Minimal replacement for agetty with SSH support
#
# Copyright © 2013, 2014, 2015 Mattias Andrée (m@maandree.se)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Read the parameters: the first is the tty, the rest are exports
tty="$1"
shift 1
if test ! $# = 0; then
export "$@"
fi
# Change TTY
exec 0<>"@dev@/${tty}"
exec 1>&0
exec 2>&0
# Store TTY settings so they can be restorted for the next run
tty_settings="$(stty --save)"
# Function used for printing information on the terminal for the user
display_function=_display
_display () {
printf '\033[H\033[2J\033[?0c'
printf "\033[%sm%s (%s)\033[0m\n" "${ANSI_COLOR}" "${NAME}" "${tty}"
printf '\nLogin: '
}
# Function for reading the username form the terminal
read_function=_read
_read () {
read user
}
# Function for logging in the user
login_function=_login
_login () {
if test ! "${user%@*}" = "${user}"; then
$_use_ssh_function
elif test -n "${user}" && test -z "${user%%-*}"; then
$_lock_tty_function
else
$_use_login_function
fi
}
# Function for locking the TTY
_lock_tty_function=_lock_tty
_lock_tty () {
stty -icanon -echo -isig -ixon -ixoff -ixany
printf '\033[01;31mNice try! Sleeping for 10 minutes...\033[0m\n'
sleep 600
}
# Function for performing the log in with `ssh`
_use_ssh_function=_use_ssh
_use_ssh () {
setsid -c ssh ${user} || sleep 3
# The sleep allows you to see any error you made
}
# Function for performing the log in with `login`
_use_login_function=_use_login
_use_login () {
setsid -c login -- "${user}"
}
# Load OS information and extensions
NAME="$(uname -o)"
ANSI_COLOR='01;34' # must be exactly ANSI_COLOR as it is defined in /etc/os-release
if test -f "@etc@/os-release"; then
. "@etc@/os-release"
fi
if test -f "@etc@/@command@rc"; then
. "@etc@/@command@rc"
fi
# Let the user log in
$display_function
$read_function
$login_function
# Restore the TTY settings for the next run
stty "${tty_settings}"
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