ddns-scripts: fixed ovh dns record update

OVH changed its API to update DNS records. It now requires HTTP Basic
Authorization header. As such the default ddns-script method to update
the DNS record is failing. The fix is to move DNS record updates into
its own script/package.

Signed-off-by: David Andreoletti <david@andreoletti.net>

net/ddns-scripts/files/usr/lib/ddns/update_ovh_com.sh

@@ -0,0 +1,32 @@
+# Script for sending user defined updates using the OVH Dynhost API
+# 2025 David Andreoletti <david at andreoletti dot net>
+
+# Options passed from /etc/config/ddns:
+# Domain - the domain name managed by OVH (e.g. example.com)
+# Username - the dynhost username of the domain (e.g. myrouter)
+# Password -  the dynhost password of the domain
+
+. /usr/share/libubox/jshn.sh
+
+# base64 encoding
+http_basic_encoding() {
+	local user="$1"
+	local password="$2"
+	echo "${user}:${password}" | openssl base64 
+}
+
+[ -z "$domain" ] && write_log 14 "Service section not configured correctly! Missing domain name as 'Domain'"
+[ -z "$username" ] && write_log 14 "Service section not configured correctly! Missing username as 'Username'"
+[ -z "$password" ] && write_log 14 "Service section not configured correctly! Missing password as 'Password'"
+
+__STATUS=$(curl -Ss -X GET "https://dns.eu.ovhapis.com/nic/update?system=dyndns&hostname=${domain}&myip=${__IP}" \
+	-H "Authorization: Basic $(http_basic_encoding "$username" "$password")" \
+	-w "%{response_code}\n" -o $DATFILE 2>$ERRFILE)
+
+if [ $? -ne 0 ]; then
+	write_log 14 "Curl failed: $(cat $ERRFILE)"
+	return 1
+elif [ -z $__STATUS ] || [ $__STATUS != 200 ]; then
+	write_log 14 "Curl failed: $__STATUS \novh.com answered: $(cat $DATFILE)"
+	return 1
+fi