[PATCH v2] OpenVPN: Calculate CIDR to DDN notation for RW

[Erik Kapfer <erik.kapfer@ipfire.org>]

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Fixes #11823

Patches enables CIDR and dotted-decimal notation for "OpenVPN subnet:" entries in "Global settings".
network-functions.pl has been introduced.

Signed-off-by: Erik Kapfer <erik.kapfer(a)ipfire.org>
---
 html/cgi-bin/ovpnmain.cgi | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/html/cgi-bin/ovpnmain.cgi b/html/cgi-bin/ovpnmain.cgi
index 976300fc7..6e57a4991 100644
--- a/html/cgi-bin/ovpnmain.cgi
+++ b/html/cgi-bin/ovpnmain.cgi
@@ -32,6 +32,7 @@ use strict;
 use Archive::Zip qw(:ERROR_CODES :CONSTANTS);
 use Sort::Naturally;
 require '/var/ipfire/general-functions.pl';
+require '/var/ipfire/network-functions.pl';
 require "${General::swroot}/lang.pl";
 require "${General::swroot}/header.pl";
 require "${General::swroot}/countries.pl";
@@ -245,6 +246,7 @@ sub pkiconfigcheck
 sub writeserverconf {
     my %sovpnsettings = ();  
     my @temp = ();  
+    my @tempovpnsubnet = ();
     &General::readhash("${General::swroot}/ovpn/settings", \%sovpnsettings);
     &read_routepushfile;
     
@@ -267,8 +269,16 @@ sub writeserverconf {
     print CONF "cert ${General::swroot}/ovpn/certs/servercert.pem\n";
     print CONF "key ${General::swroot}/ovpn/certs/serverkey.pem\n";
     print CONF "dh ${General::swroot}/ovpn/ca/$cgiparams{'DH_NAME'}\n";
-    my @tempovpnsubnet = split("\/",$sovpnsettings{'DOVPN_SUBNET'});
-    print CONF "server $tempovpnsubnet[0] $tempovpnsubnet[1]\n";
+    # ovpn subnet calculate prefix to netmask if needed
+    if ($sovpnsettings{'DOVPN_SUBNET'} ne '') {
+        my ($ip,$subnet) = split(/\//,"$vpnsettings{'DOVPN_SUBNET'}");
+        if (&Network::check_prefix($subnet)) {
+            $subnet = &Network::convert_prefix2netmask($subnet);
+            print CONF "server $ip $subnet\n";
+        } else {
+            print CONF "server $ip $subnet\n";
+        }
+    }
     #print CONF "push \"route $netsettings{'GREEN_NETADDRESS'} $netsettings{'GREEN_NETMASK'}\"\n";
 
     # Check if we are using mssfix, fragment and set the corretct mtu of 1500.
-- 
2.12.2