Added dynu.com as dynamic DNS updater

Signed-off-by: Stefano Guandalini <stefano.guandalini@proton.ch>

Author: sguandal

bin/ncp/NETWORKING/dynuDNS.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+
+# DynuDNS updater client installation on Raspbian
+#
+# Copyleft 2022 by Stefano Guandalini <guandalf _a_t_ protonmail _d_o_t_ com>
+# GPL licensed (see end of file) * Use at your own risk!
+#
+
+
+
+install()
+{
+  apt-get update
+  apt-get install --no-install-recommends -y dnsutils
+}
+
+configure() 
+{
+  local updateurl=https://api.dynu.com/nic/update
+  local url="${updateurl}?hostname=${DOMAIN}&myipv6=${MYIPV6}&password=${PASSWORD}"
+
+  [[ $ACTIVE != "yes" ]] && { 
+    rm -f /etc/cron.d/dynuDNS
+    service cron restart
+    echo "dynuDNS client is disabled"
+    return 0
+  }
+
+  cat > /usr/local/bin/dynudns.sh <<EOF
+#!/bin/bash
+echo "DynuDNS client started"
+echo "${url}"
+registeredIP=\$(dig +short "$DOMAIN"|tail -n1)
+currentIP=\$(wget -q -O - http://checkip.dyndns.org|sed s/[^0-9.]//g)
+    [ "\$currentIP" != "\$registeredIP" ] && {
+        wget -q -O /dev/null "${url}"
+  }
+echo "Registered IP: \$registeredIP | Current IP: \$currentIP"
+EOF
+  chmod +744 /usr/local/bin/dynudns.sh
+
+  echo "*/${UPDATEINTERVAL}  *  *  *  *  root  /bin/bash /usr/local/bin/dynudns.sh" > /etc/cron.d/dynuDNS
+  chmod 644 /etc/cron.d/dynuDNS
+  service cron restart
+
+  set-nc-domain "$DOMAIN"
+
+  echo "DynuDNS client is enabled"
+}
+
+# License
+#
+# This script is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This script is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this script; if not, write to the
+# Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+# Boston, MA  02111-1307  USA

etc/ncp-config.d/dynuDNS.cfg

@@ -0,0 +1,40 @@
+{
+  "id": "dynuDNS",
+  "name": "Dynamic DNS from dynuDNS",
+  "title": "dynuDNS",
+  "description": "DynuDNS DynamicDNS service",
+  "info": "Need account from https://www.dynu.com/",
+  "infotitle": "",
+  "params": [
+    {
+      "id": "ACTIVE",
+      "name": "Active",
+      "value": "no",
+      "type": "bool"
+    },
+    {
+      "id": "PASSWORD",
+      "name": "Password (better UpdateIP hashed)",
+      "value": "",
+      "suggest": "abcdefghijklmnopqrstuvwxyzABCDEFGHIJK1234567"
+    },
+    {
+      "id": "MYIPV6",
+      "name": "IpV6 address",
+      "value": "no",
+      "suggest": "IpV6 address or 'no' not to update"
+    },
+    {
+      "id": "DOMAIN",
+      "name": "Domain",
+      "value": "mynextcloud.example.com",
+      "suggest": "mynextcloud.example.com"
+    },
+    {
+      "id": "UPDATEINTERVAL",
+      "name": "Update periodicity (in minutes)",
+      "value": "30",
+      "suggest": "30"
+    }
+  ]
+}