flowgen_wrapper.sh: support domain names

Create a wrapper script to support domain names to specify the
collector.

Dockerfile

@@ -4,7 +4,10 @@ FROM debian:bookworm-slim as builder
 RUN apt-get update && apt-get -y install gcc make
 COPY * /tmp/
 RUN cd tmp && make && ls -la
+RUN apt-get -y clean && rm -rf /var/lib/apt/lists/*
 
 FROM debian:bookworm-slim
+RUN apt-get -y install dnsutils
 COPY --from=builder /tmp/flowgen /usr/bin/
-ENTRYPOINT ["/usr/bin/flowgen"]
+COPY --from=builder /tmp/flowgen_wrapper.sh /usr/bin/
+ENTRYPOINT ["/usr/bin/flowgen_wrapper.sh"]

flowgen_wrapper.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -e
+
+# Attempt to resolve domain name
+IP=$(dig +short ${@: -1})
+
+#Print resolution
+echo "Sending flow records to ${IP}..."
+flowgen ${@:1:$#-1} ${IP}