From ff9c641763702ae99632bbf4d0825d578440c074 Mon Sep 17 00:00:00 2001
From: Stefan Metzmacher <metze@samba.org>
Date: Fri, 11 Dec 2009 19:56:36 +0100
Subject: [PATCH] config: add some ipv4 helper shell functions

Many thanks to Michael Adam <obnox@samba.org>
for the basic work.

metze
---
 config/functions | 64 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/config/functions b/config/functions
index 115794ec..32d6d98a 100644
--- a/config/functions
+++ b/config/functions
@@ -658,6 +658,70 @@ ctdb_standard_event_handler ()
     esac
 }
 
+ipv4_host_addr_to_net_addr()
+{
+	local HOST=$1
+	local MASKBITS=$2
+
+	local HOST0=$(echo $HOST | awk -F . '{print $4}')
+	local HOST1=$(echo $HOST | awk -F . '{print $3}')
+	local HOST2=$(echo $HOST | awk -F . '{print $2}')
+	local HOST3=$(echo $HOST | awk -F . '{print $1}')
+
+	local HOST_NUM=$(( $HOST0 + $HOST1 * 256 + $HOST2 * (256 ** 2) + $HOST3 * (256 ** 3) ))
+
+	local MASK_NUM=$(( ( (2**32 - 1) * (2**(32 - $MASKBITS)) ) & (2**32 - 1) ))
+
+	local NET_NUM=$(( $HOST_NUM & $MASK_NUM))
+
+	local NET0=$(( $NET_NUM & 255 ))
+	local NET1=$(( ($NET_NUM & (255 * 256)) / 256 ))
+	local NET2=$(( ($NET_NUM & (255 * 256**2)) / 256**2 ))
+	local NET3=$(( ($NET_NUM & (255 * 256**3)) / 256**3 ))
+
+	echo "$NET3.$NET2.$NET1.$NET0"
+}
+
+ipv4_maskbits_to_net_mask()
+{
+	local MASKBITS=$1
+
+	local MASK_NUM=$(( ( (2**32 - 1) * (2**(32 - $MASKBITS)) ) & (2**32 - 1) ))
+
+	local MASK0=$(( $MASK_NUM & 255 ))
+	local MASK1=$(( ($MASK_NUM & (255 * 256)) / 256 ))
+	local MASK2=$(( ($MASK_NUM & (255 * 256**2)) / 256**2 ))
+	local MASK3=$(( ($MASK_NUM & (255 * 256**3)) / 256**3 ))
+
+	echo "$MASK3.$MASK2.$MASK1.$MASK0"
+}
+
+ipv4_is_valid_addr()
+{
+	local ADDR=$1
+	local fail=0
+
+	local N=`echo $ADDR | sed -e 's/[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*//'`
+	test -n "$N" && fail=1
+
+	local ADDR0=$(echo $ADDR | awk -F . '{print $4}')
+	local ADDR1=$(echo $ADDR | awk -F . '{print $3}')
+	local ADDR2=$(echo $ADDR | awk -F . '{print $2}')
+	local ADDR3=$(echo $ADDR | awk -F . '{print $1}')
+
+	test "$ADDR0" -gt 255 && fail=1
+	test "$ADDR1" -gt 255 && fail=1
+	test "$ADDR2" -gt 255 && fail=1
+	test "$ADDR3" -gt 255 && fail=1
+
+	test x"$fail" != x"0" && {
+		#echo "IPv4: '$ADDR' is not a valid address"
+		return 1;
+	}
+
+	return 0;
+}
+
 ########################################################
 # load a site local config file
 ########################################################
-- 
2.34.1