Add support for domains and not only IP

Author: rsp

internalip

@@ -1,10 +1,18 @@
-#!/bin/sh
+#!/bin/bash
 
 # get internal IP address
 # used for outgoing Internet connections
 # see: https://github.com/rsp/scripts/blob/master/internalip.md
 
+resolve() {
+	(gethostip -d $1 || getent ahostsv4 $t | grep RAW | awk '{print $1; exit}') 2>/dev/null
+}
+
 [ -n "$1" ] && t=$1 || t='8.8.8.8'
 
+[ -n "${t//[0-9.]}" ] && t=$(resolve $t)
+
+[ -n "$t" ] || { echo Cannot resolve domain $1 >&2; exit 1; }
+
 ip route get $t | awk '{print $NF; exit}'