1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
#!/bin/bash
# This script is a legacy. The same functionality can be implemented by setting
# up a back up task. See [conf/py-sample/sample.jsonc]
# Copyright (c) 2022 David Timber <dxdt@dev.snart.me>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
do_query () {
# dig returns 0 upon successful reception and parse of the response message.
# All the other exit codes other than 0 will cause the script to terminate
# as a result of set -e. +short option makes dig return the values of RR.
# We assume that a status code has returned when dig produces no output with
# the option. Caution must be taken in this approach as zones with no
# record will also return nothing with the status code zero.
dig +short +dnssec +notcp ANY "$TARGET" > "$tmpf"
if [ ! -s "$tmpf" ]; then
echo "The nameserver returned no RR!
DNSSEC verification probably failed." >&2
exit 1
fi
}
if [ "$#" -lt 1 ]; then
cat >&2 << EOF
The Periodic Automatic Linux Host Maintenance (PALHM) DNSSEC check
Usage: $0 <record name>
The zone must contain at least one resource record set. The nameservers
configured for the host must support DNSSEC validation.
To test your host configuration, running
\$ $0 dnssec-failed.org
should produce error messages.
EOF
exit 2
fi
declare TARGET="$1"
declare tmpf="$(mktemp --tmpdir "palhm-dnssec.XXXXXXXXXX")"
do_query & set +e
wait
ec="$?"
rm "$tmpf"
exit "$ec"
|
