#!/bin/sh
#
# 30-ask-hostname - request the user to type in the hostname of the local host
#
# Copyright © martin f. krafft <madduck@madduck.net>
# Released under the terms of the Artistic Licence 2.0
#
set -eu

ME=molly-guard

[ -f "$MOLLYGUARD_SETTINGS" ] && . "$MOLLYGUARD_SETTINGS"

PRETEND_SSH=0
for arg in "$@"; do
  case "$arg" in
    (*-pretend-ssh) PRETEND_SSH=1;;
  esac
done

# require an interactive terminal connected to stdin
if ! test -t 0; then
  echo "E: $ME: not connected to a terminal."
  exit 1
fi

# we've been asked to always protect this host
if [ ${ALWAYS_QUERY_HOSTNAME:-0} -eq 1 ]; then
  echo "I: $ME: $MOLLYGUARD_CMD is always molly-guarded on this system."
else
  # only run if we are being called over SSH, that is if the current terminal
  # was created by sshd.
  PTS=$(readlink /proc/$$/fd/0)
  if ! pgrep -f "^sshd.+${PTS#/dev/}[[:space:]]*$" >/dev/null \
    && [ -z "${SSH_CONNECTION:-}" ]; then
      if [ $PRETEND_SSH -eq 1 ]; then
        echo "I: $ME: this is not an SSH session, but --pretend-ssh was given..."
      else
        exit 0
      fi
  else
    echo "W: $ME: SSH session detected!"
  fi
fi

HOSTNAME="$(hostname --short)"

sigh()
{
  echo "Good thing I asked; I won't $MOLLYGUARD_CMD $HOSTNAME ..."
  exit 1
}

trap 'echo;sigh' 1 2 3 9 10 12 15

echo -n "Please type in hostname of the machine to $MOLLYGUARD_CMD: "
read HOSTNAME_USER || :

[ "$HOSTNAME_USER" = "$HOSTNAME" ] || sigh

trap - 1 2 3 9 10 12 15

exit 0