Log parsing utils in contrib/reverse-dns

contrib/reverse-dns/reverse_replace.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+# $Id: reverse_replace.sh 4 2015-02-17 20:14:59Z jo $
+#
+# Usage e.g.: netstat -n -4 | reverse_replace.sh 
+# Parses stdin for IP4 addresses and replaces them 
+# with names retrieved by reverse_dns.sh
+#
+
+DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
+DNS=$DIR/reverse_dns.sh
+
+# sed regex
+IP_regex='[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}'
+
+while read LINE; do
+  if grep --quiet $IP_regex <<< "$LINE"; then
+    IPs=`sed "s#.*\b\($IP_regex\)\b.*#\1 #g" <<< "$LINE"`
+    IPs=($IPs)
+    for IP in "${IPs[@]}"
+    do
+      NAME=`$DNS $IP`
+      # echo "$NAME is $IP";
+      LINE="${LINE/$IP/$NAME}" 
+    done
+  fi
+  echo $LINE
+done < /dev/stdin
+