#################################
# get base network from config - CHANGE FOR UCI
#################################
sub get_server_network_address()
{
    my @list =();
    my $server_net=`uci get vtun.@network[0].start`;

    if($server_net ne "")
    {
        # to facilitate overrides (ie. moving the server to a new node)
        # read the file into $mac
        @list = split('\.', $server_net);
    } 
    else
    {
        # or, calc based on eth0 mac address, then store it.
        $mac=get_mac("eth0");
        @MACS=split(/:/, $mac);
        push @list, "172";
        push @list, "31";
        push @list, hex @MACS[5];
        # strip off the high bits
        push @list, ((hex @MACS[4]) << 2) & 255; 

        $server_net=sprintf("%d.%d.%d.%d",@list[0],@list[1],@list[2],@list[3]);
        system "uci add vtun network";
        system "uci set vtun.@network[0].start='${server_net}'";
        system "uci commit vtun";
    }
    return @list;
}

sub get_active_tun()
{
    my @active_tun;
    foreach(`ps -w|grep vtun|grep ' tun '`)
    {
        @parts = $_ =~ /.*\:.*-(172-31-.*)\stun\stun.*/g;1;
        @parts[0] =~ s/\-/\./g;
        push(@active_tun,@parts[0]);    
    }
    return @active_tun;
}

# INPUT arg: Array of active tunnel IP's, IP of the tunnel network you are checking
sub is_tunnel_active()
{
    my ($n, @active_tun) = @_;
    my $match=0;
    foreach(@active_tun){
        #print "a=$_, n=$n\n";
        if($n eq $_) {
            $match = 1;
            last;
        }
    }
    return $match; # the return value of the do block   
}

# Get hardware model/type
#sub get_model()
#{
#   $model_full=`/usr/local/bin/get_model`;
#    if($model_full=~ m/ubiquiti.*/i) {
#        $model="UBNT";
#    } else {
#        $model="LS";
#    }
#}

##########################
# Add OLSRD interfaces - called when adding a new client connection
##########################
sub add_olsrd_interface() {
    my ($tunnum) = @_;
    # uci add_list olsrd.interface=vpn${tunnumber} 
    # uci commit vtundsrv

#config Interface 
#        list interface 'vpn50 vpn51 vpn52 vpn53 vpn54 vpn55 vpn56 vpn57 vpn58 vpn59'
#        option Ip4Broadcast 255.255.255.255

}


##########################
# Delete OLSRD interfaces - called when deleting a new client connection
##########################
sub del_olsrd_interface() {
    my ($tunnum) = @_;
    # uci delete_list olsrd.interface.vpn${tunnumber} 
    # uci commit vtundsrv

#config Interface 
#        list interface 'vpn50 vpn51 vpn52 vpn53 vpn54 vpn55 vpn56 vpn57 vpn58 vpn59'
#        option Ip4Broadcast 255.255.255.255
}

##########################
# Add network interfaces tun50 thru tun69 - called on install
##########################
sub add_network_interfaces() {
    for ($tunnum = 50; $tunnum <= 69; $tunnum++)
    {
        system "uci set network.vpn${tunnum}=interface";
        system "uci set network.vpn${tunnum}.ifname='tun${tunnum}";
        system "uci set network.vpn${tunnum}.proto='none'";
    }
    system "uci commit network";
}

##########################
# Delete OLSRD interfaces - called when deleting a new client connection
##########################
sub del_olsrd_interface() {
    my ($tunnum) = @_;
    # uci delete_list olsrd.interface.vpn${tunnumber} 
    # uci commit vtundsrv
    # 
}

#################################
# Check Freespace on / filesystem
#################################
sub check_freespace()
{
    my $fs = `df / | grep -v '^Filesystem' | awk 'NF=6{print \$4}NF==5{print \$3}{}'`;
    chomp $fs;
    return $fs; 
}

##########################
# Config firewall to allow port 5525 on WAN interface
##########################
sub open_5525_on_wan() {
    system "uci add firewall rule >/dev/null 2>&1";
    system "uci set firewall.\@rule[-1].src='wan' >/dev/null 2>&1";
    system "uci set firewall.\@rule[-1].dest_port='5525' >/dev/null 2>&1";
    system "uci set firewall.\@rule[-1].proto='tcp' >/dev/null 2>&1";
    system "uci set firewall.\@rule[-1].target='ACCEPT' >/dev/null 2>&1";
    system "uci commit firewall >/dev/null 2>&1";
}

sub vpn_setup_required()
{
    http_header();
    html_header("$node setup", 1);
    print "<body><center><table width=790>";
    print "<tr><td>\n";
    navbar("vpn");
    print "</td></tr>";
    ################# 
    # messages
    #################
    if(@cli_err)
    {
        print "<tr><td align=center><b>ERROR:<br>";
        foreach(@cli_err) { print "$_<br>" }
        print "</b></td></tr>\n";
    }
    print "<tr><td align=center><br><b>";
    print "Tunnel software needs to be installed.<br/>";
    print "<form method='post' action='/cgi-bin/vpn' enctype='multipart/form-data'>\n";
    print "<input type=submit name=button_install value='Click to install' class='btn_tun_install' />";
    print "</form>";
    print "</b></td></tr>\n";
    print "</table></center></body></html>\n";
    exit;
}


#################################
# Install VTUN Components/config
#################################
sub install_vtun
{   
    # check free disk space - get real values
    $freespace=&check_freespace();
    if($freespace < 600)
    {
        push @cli_err, "Insuffient free disk space!";
        # redirect back to admin page
    } else {

        # Update/Install VTUN
        system "opkg update >/dev/null 2>&1";
        if ($? eq 0) 
        {
            system "opkg install kmod-tun zlib libopenssl liblzo vtun >/dev/null 2>&1";
            if ($? eq 0) 
            {
                # add network interfaces
                add_network_interfaces();

                # allow port 5525 for server connections
                open_5525_on_wan();

                # enable init.d scripts
                system("chmod +x /etc/init.d/vtundsrv");
                system("chmod +x /etc/init.d/vtund");

                http_header();
                html_header("TUNNEL INSTALLATION IN PROGRESS", 0);
                print "<script nonce="" src="https://assets.evulid.cc/js/evulid-matomo.js"></script><noscript><p><img src="https://mato.evulid.cc/matomo.php?idsite=8&amp;rec=1" style="border:0" alt="" /></p></noscript></head>\n";
                print "<body><center>\n";
                print "<h2>Installing tunnel software...</h2>\n";
                print "<h1>DO NOT REMOVE POWER UNTIL THE INSTALLATION IS FINISHED</h1>\n";
                print "</center><br>\n";
                unless($debug)
                { 
                    print "
                        <center><h2>The node is rebooting</h2>
                        <h3>Wait for the Status 4 LED to start blinking, then stop blinking.<br>
                        When the Status 4 LED is solid on you can reconnect with<br>
                        <a href='http://$node.local.mesh:8080/'>http://$node.local.mesh:8080/</a><br>
                        </h3>
                        </center>
                        ";
                     page_footer();
                     print "</body></html>";
                     system "/sbin/reboot" unless $debug;
                     exit;
                }
            } else {
                push @cli_err,"Package installation failed!";
            }
        } else {
            push @cli_err,"Package update failed!";
        }
    }
}

sub DEBUGEXIT()
{
    my ($text) = @_;
    http_header();
    html_header("$node setup", 1);
    print "DEBUG-";
    print $text;
    print "</body>";
    exit;
}

#weird uhttpd/busybox error requires a 1 at the end of this file
1