From: Leon M. Busch-George <leon@georgemail.eu>
Date: Fri, 16 Jun 2023 12:58:48 +0000 (+0200)
Subject: base-files: ipcalc.sh: don't print broadcast addr for prefix > 30
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=59e681eea1fbf969ff6f2da315f18142b70424bd;p=openwrt%2Fopenwrt.git

base-files: ipcalc.sh: don't print broadcast addr for prefix > 30

Printing a broadcast address doesn't make any sense for /31 and /32
prefixes.
Strictly speaking, the same goes for the network address but it is useful
to get the first address in the prefix, e.g. to create a canonical
CIDR notation "$NETWORK/$PREFIX".

Signed-off-by: Leon M. Busch-George <leon@georgemail.eu>
---

diff --git a/package/base-files/files/bin/ipcalc.sh b/package/base-files/files/bin/ipcalc.sh
index c852b5163f..ffcdfc02d8 100755
--- a/package/base-files/files/bin/ipcalc.sh
+++ b/package/base-files/files/bin/ipcalc.sh
@@ -50,12 +50,14 @@ BEGIN {
 
 	network=and(ipaddr,netmask)
 	prefix=32-bitcount(compl32(netmask))
-	broadcast=or(network,compl32(netmask))
 
 	print "IP="int2ip(ipaddr)
 	print "NETMASK="int2ip(netmask)
-	print "BROADCAST="int2ip(broadcast)
 	print "NETWORK="int2ip(network)
+	if (prefix<=30) {
+		broadcast=or(network,compl32(netmask))
+		print "BROADCAST="int2ip(broadcast)
+	}
 	print "PREFIX="prefix
 
 	# range calculations: