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[distro-setup] / disabled / home-vpn / lan-dyn-dns-update

diff --git a/disabled/home-vpn/lan-dyn-dns-update b/disabled/home-vpn/lan-dyn-dns-update
new file mode 100644 (file)
index 0000000..88cdf2d
--- /dev/null
+++ b/disabled/home-vpn/lan-dyn-dns-update
@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# usage: I run this script on a timer to correct the dns on wrt for
+# clients where dns is updated dynamically by openvpn, in the case that
+# openvpn crashes or the computer running openvpn crashes.
+
+set -eE -o pipefail
+trap 'echo "$0:$LINENO:error: \"$BASH_COMMAND\" returned $?" >&2' ERR
+
+x="$(readlink -f "$BASH_SOURCE")"; cd ${x%/*} # directory of this file
+
+while read -r ip host; do
+    found=false
+    is_connected="grep -q "^CLIENT_LIST,$host," /run/openvpn-server/status-server.log"
+    if $is_connected; then continue; fi
+    if ! grep -q "^CLIENT_LIST,$host," /run/openvpn-server/status-server.log; then
+        cd $(mktemp -d); dir=$PWD
+        ssh wrt tar -C /etc -c hosts | tar -x
+        if grep -qFx "$ip $host" hosts; then continue; fi
+        # openvpn udpates its status file every 60 seconds by default
+        if (( $(stat -c%Y hosts) > EPOCHSECONDS + 60 )); then
+            sleep 60
+            if $is_connected; then continue; fi
+        fi
+        ssh root@wrt.b8.nz cedit ovpn-$host <<<"$ip $host" || [[ $? == 1 ]]
+    fi
+done <lan-dns