From 01b23b6900eabefbfd1f589b9f12c8ff38c5afc0 Mon Sep 17 00:00:00 2001
From: Harald Hoyer <harald@redhat.com>
Date: Wed, 12 Aug 2015 14:24:05 +0200
Subject: [PATCH] network/net-lib.sh: add is_ip()

add function to test if string is a valid IP
---
 modules.d/40network/net-lib.sh | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/modules.d/40network/net-lib.sh b/modules.d/40network/net-lib.sh
index 68bc095..5c65a2e 100755
--- a/modules.d/40network/net-lib.sh
+++ b/modules.d/40network/net-lib.sh
@@ -1,5 +1,17 @@
 #!/bin/sh
 
+is_ip() {
+    echo "$1" | {
+        IFS=. read a b c d
+        test "$a" -ge 0 -a "$a" -le 255 \
+             -a "$b" -ge 0 -a "$b" -le 255 \
+             -a "$c" -ge 0 -a "$c" -le 255 \
+             -a "$d" -ge 0 -a "$d" -le 255 \
+             2> /dev/null
+    } && return 0
+    return 1
+}
+
 get_ip() {
     local iface="$1" ip=""
     ip=$(ip -o -f inet addr show $iface)