2 # I, Ian Kelling, follow the GNU license recommendations at
3 # https://www.gnu.org/licenses/license-recommendations.en.html. They
4 # recommend that small programs, < 300 lines, be licensed under the
5 # Apache License 2.0. This file contains or is part of one or more small
6 # programs. If a small program grows beyond 300 lines, I plan to switch
9 # Copyright 2024 Ian Kelling
11 # Licensed under the Apache License, Version 2.0 (the "License");
12 # you may not use this file except in compliance with the License.
13 # You may obtain a copy of the License at
15 # http://www.apache.org/licenses/LICENSE-2.0
17 # Unless required by applicable law or agreed to in writing, software
18 # distributed under the License is distributed on an "AS IS" BASIS,
19 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
20 # See the License for the specific language governing permissions and
21 # limitations under the License.
24 # usage: I run this script on a timer to correct the dns on wrt for
25 # clients where dns is updated dynamically by openvpn, in the case that
26 # openvpn crashes or the computer running openvpn crashes.
29 trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
31 x
="$(readlink -f "$BASH_SOURCE")"; cd ${x%/*} # directory of this file
33 while read -r ip
host; do
35 is_connected
="grep -q "^CLIENT_LIST
,$host," /run/openvpn-server/status-server.log"
36 if $is_connected; then continue; fi
37 if ! grep -q "^CLIENT_LIST,$host," /run
/openvpn-server
/status-server.log
; then
38 cd $
(mktemp
-d); dir
=$PWD
39 ssh wrt
tar -C /etc
-c hosts |
tar -x
40 if grep -qFx "$ip $host" hosts
; then continue; fi
41 # openvpn udpates its status file every 60 seconds by default
42 if (( $
(stat
-c%Y hosts
) > EPOCHSECONDS
+ 60 )); then
44 if $is_connected; then continue; fi
46 ssh root@wrt.b8.nz cedit ovpn-
$host <<<"$ip $host" ||
[[ $?
== 1 ]]