From: Harald Hoyer <harald@redhat.com>
Date: Wed, 12 Aug 2015 12:24:05 +0000 (+0200)
Subject: network/net-lib.sh: add is_ip()
X-Git-Tag: 044~120
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=01b23b6900eabefbfd1f589b9f12c8ff38c5afc0;p=thirdparty%2Fdracut.git

network/net-lib.sh: add is_ip()

add function to test if string is a valid IP
---

diff --git a/modules.d/40network/net-lib.sh b/modules.d/40network/net-lib.sh
index 68bc09524..5c65a2ea8 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)