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a9a2e90fdd6a9bfb38ef46160e3f36cee75c1123
[code/molly-guard.git] / checks.d / molly-guard
1 #!/bin/sh
2 #
3 # molly-guard -- wrapper script to prevent erroneous shutdowns via SSH
4 #
5 # Copyright © martin f. krafft <madduck@madduck.net>
6 # Released under the terms of the Artistic Licence 2.0
7 #
8 set -eu
9
10 ME=molly-guard
11
12 PRETEND_SSH=0
13 CMD=$1
14 shift
15 for arg in "$@"; do
16   case "$arg" in
17     (*-help)
18       usage 2>&1
19       eval $EXEC --help 2>&1
20       exit 1
21       ;;
22     (*-pretend-ssh) PRETEND_SSH=1;;
23   esac
24 done
25
26 # require an interactive terminal connected to stdin
27 test -t 0                    || exit 0
28
29 # only run if we are being called over SSH, that is if the current terminal
30 # was created by sshd.
31 PTS=$(readlink /proc/$$/fd/0)
32 if ! pgrep -f "^sshd.+${PTS#/dev/}[[:space:]]*$" >/dev/null \
33   && [ -z "${SSH_CONNECTION:-}" ]; then
34     if [ $PRETEND_SSH -eq 1 ]; then
35       echo "I: this is not an SSH session, but --pretend-ssh was given..."
36     else
37       exit 0
38     fi
39 else
40   echo "W: $ME: SSH session detected!"
41 fi
42
43
44 HOSTNAME="$(hostname --short)"
45
46 sigh()
47 {
48   echo "Good thing I asked; I won't $CMD $HOSTNAME ..."
49   exit 1
50 }
51
52 trap 'echo;sigh' 1 2 3 9 10 12 15
53
54 echo -n "Please type in hostname of the machine to $CMD: "
55 read HOSTNAME_USER || :
56
57 [ "$HOSTNAME_USER" = "$HOSTNAME" ] || sigh
58
59 trap - 1 2 3 9 10 12 15
60
61 exit 0