init edns

Dockerfile

@@ -0,0 +1,12 @@
+FROM alpine:3.20
+
+RUN apk --no-cache add \
+    socat
+
+ADD ./entrypoint.sh /usr/local/bin/entrypoint
+
+EXPOSE 53/udp
+
+ENTRYPOINT [ "entrypoint" ]
+
+CMD [ "-any" ]

entrypoint.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+
+set -ex
+
+# Without arguments, simply exec shell
+[[ -z $1 ]] && {
+	exec /bin/sh
+}
+
+
+# If the first character from the input is different from "-"
+# execute the command - allow it to run any command
+[[ ! "${1:0:1}" = '-' ]] && {
+  exec "$@"
+}
+
+debug=""
+bind="0.0.0.0"
+
+while [ "$#" != "0" ]; do
+  case $1 in
+    -debug)
+      debug="-d -d -d -d"
+      ;;
+
+    -any)   
+      ;;
+
+    -iface)   
+      bind="$1"
+      ;;
+
+    *) 
+      echo "Unknown Argument [$1]."
+      echo "Aborting."
+      exit 1
+      ;;
+  esac
+  shift
+done
+
+exec socat $debug UDP4-RECVFROM:53,fork,bind="$bind" UDP4-SENDTO:127.0.0.11:53