From 56f0b37b25dfbc7a92dcf4a6b411fdf70bdcff72 Mon Sep 17 00:00:00 2001
From: Darren 'Tadgy' Austin <darren@afterdark.org.uk>
Date: Sat, 28 Nov 2020 21:56:39 +0000
Subject: Add function to convert new CIDR format netmasks to old style dotted
 quad.

Replace setting of BROADCAST and NETWORK for use when writing files.
---
 netconfig | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/netconfig b/netconfig
index acb9a85..0f1ce44 100644
--- a/netconfig
+++ b/netconfig
@@ -356,6 +356,14 @@ fi
 rm -f $TMP/tempmsg /cardfound
 } # end write_config_files
 
+# Covert CIDR notation masks to old style dotted quad.
+cidr2mask() {
+  # https://forum.archive.openwrt.org/viewtopic.php?id=47986&p=1#p220781
+  set -- $(( 5 - ($1 / 8) )) 255 255 255 255 $(( (255 << (8 - ($1 % 8))) & 255 )) 0 0 0
+  [ $1 -gt 1 ] && shift $1 || shift
+  echo "${1-0}.${2-0}.${3-0}.${4-0}"
+}
+
 # This checks IPv4 address syntax.
 # usage: syntax_check_v4 ADDRESS #-OF-EXPECTED-SEGMENTS (up to 4)
 # example: syntax_check_v4 123.22.43.1 4
@@ -635,7 +643,6 @@ else
 fi
 
 if [ "$LOOPBACK" = "no" -a ! "$USE_DHCP" = "yes" -a ! "$USE_SLAAC" = "yes" ]; then
-# FIXME: need to check the logic in these:
   while [ 0 ]; do
     while [ 0 ]; do
       if [ -r $TMP/SeTIPSv4 ]; then
@@ -1068,6 +1075,11 @@ can do that now using 'Edit' (or reconfigure later using 'netconfig')." \
       break
     fi
   done
+  if [ ! "${IPADDRS[0]}" = "" ]; then
+    NM="$(cidr2mask "${IPADDRS[0]#*/}")"
+    BROADCAST="$(ipmask "$NM" "${IPADDRS[0]%/*}" | cut -f 1 -d ' ')"
+    NETWORK="$(ipmask "$NM" "${IPADDRS[0]%/*}" | cut -f 2 -d ' ')"
+  fi
 else # DHCP was used
   dialog --title "CONFIRM NETWORK SETUP" \
 --yesno "Your networking system is now configured to use DHCP:
-- 
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