#!/usr/bin/perl

$debug = 0;

BEGIN {push @INC, '/www/cgi-bin'};
use perlfunc;

#
# load the config parms
#

read_postdata();

($config = $parms{config}) or 
($config = nvram_get("config") and -d "/etc/config.$config") or 
($config = "mesh");

# convert the %parms into scalars for convenience
if($parms{button_default})
{
    load_cfg("/etc/config.$config/_setup.default");
    foreach(keys %cfg)
    {
	eval (sprintf "\$$_ = \"%s\"", quotemeta $cfg{$_});
    }
}
else
{
    foreach(keys %parms)
    {
	next unless /^\w+$/;
	$parms{$_} =~ s/^\s+//;
	$parms{$_} =~ s/\s+$//;
	eval (sprintf "\$$_ = \"%s\"", quotemeta $parms{$_});
    }

    if($button_reset or $config ne $oldconfig)
    {
	load_cfg("/etc/config.$config/_setup");
	foreach(keys %cfg)
	{
	    eval (sprintf "\$$_ = \"%s\"", quotemeta $cfg{$_});
	}
    }
}

if($parms{button_reset} or $parms{button_default} or (not $nodetac and not keys %parms))
{
    $nodetac = nvram_get("node");
    $tactical = nvram_get("tactical");
    $nodetac .= " / $tactical" if $tactical;
}
else
{
    $nodetac = $parms{nodetac};
}

# make sure unchecked checkboxes are accounted for
foreach(qw(lan_dhcp olsrd_bridge olsrd_gw wifi_hidden))
{
    $parms{$_} = 0 unless $parms{$_};
}

# lan is always static
$lan_proto = "static";

# enforce direct mode settings
# (formerly known as dmz mode)
$dmz_mode = 0 unless $config eq "mesh";
$dmz_mode = 2 if $dmz_mode != 0 and $dmz_mode < 2;
$dmz_mode = 4 if $dmz_mode > 4;

if($dmz_mode)
{
    $ipshift = (ip2decimal($wifi_ip) << $dmz_mode) & 0xffffff;
    $dmz_lan_ip = add_ip_address("1" . decimal2ip($ipshift), 1);
    $dmz_lan_mask = decimal2ip(0xffffffff << $dmz_mode);
    ($octet) = $dmz_lan_ip =~ /\d+\.\d+\.\d+\.(\d+)/;
    $dmz_dhcp_start = $octet + 1;
    $dmz_dhcp_end = $dmz_dhcp_start + (1 << $dmz_mode) - 4;
    $parms{dmz_lan_ip}     = $dmz_lan_ip;
    $parms{dmz_lan_mask}   = $dmz_lan_mask;
    $parms{dmz_dhcp_start} = $dmz_dhcp_start;
    $parms{dmz_dhcp_end}   = $dmz_dhcp_end;
}

# derive values which are not explicitly defined
$parms{dhcp_limit} = $dhcp_limit = $dhcp_end - $dhcp_start;
$parms{dmz_dhcp_limit} = $dmz_dhcp_limit = $dmz_dhcp_end - $dmz_dhcp_start;

#
# get the active wifi settings on a fresh page load
#

unless($parms{reload})
{
    ($wifi_txpower) = `iwconfig wlan0 2>/dev/null` =~ /Tx-Power=(\d+)/;
    if (wifi_useschains()){
        $wifi_txant = `cat /sys/kernel/debug/ieee80211/phy0/ath9k/tx_chainmask`;
        $wifi_rxant = `cat /sys/kernel/debug/ieee80211/phy0/ath9k/rx_chainmask`;
        $wifi_txant = hex($wifi_txant);
        $wifi_rxant = hex($wifi_rxant); 
    }
    else {
        foreach ( `iw phy phy0 info` ) {
            next unless /Configured Antennas: TX 0x([\d]+) RX 0x([\d]+)/;
            $wifi_txant = $1;
            $wifi_rxant = $2;
        }
    }
    $slottime   = "";
}

# sanitize the active settings
%valid_ant = wifi_validant();
$wifi_txpower = wifi_maxpower() if not defined $wifi_txpower or $wifi_txpower > wifi_maxpower();
$wifi_txpower = 1 if $wifi_txpower < 1;
$wifi_rxant = wifi_defaultant() if not defined $wifi_rxant or not exists $valid_ant{$wifi_rxant};
$wifi_txant = wifi_defaultant() if not defined $wifi_txant or not exists $valid_ant{$wifi_txant};
$wifi_distance = 0 unless defined $wifi_distance;
$wifi_distance = 0 if $wifi_distance =~ /\D/;

# stuff the sanitized data back into the parms hash
# so they get saved correctly
$parms{wifi_distance} = $wifi_distance;
$parms{wifi_txpower} = $wifi_txpower;
$parms{wifi_txant} = $wifi_txant;
$parms{wifi_rxant} = $wifi_rxant;

#
# apply the wifi settings
#

if($parms{button_apply} or $parms{button_save})
{
    $cmd  = "iwconfig wlan0 txpower $wifi_txpower >/dev/null 2>&1;";
    $cmd .= "iw phy phy0 set distance $wifi_distance >/dev/null 2>&1;";
    if(wifi_useschains()){
        $cmd .= "uci set wireless.\@wifi-device[0].rxchain=$wifi_rxant >/dev/null 2>&1;";
        $cmd .= "uci set wireless.\@wifi-device[0].txchain=$wifi_txant >/dev/null 2>&1;";
        $cmd .= "echo $wifi_rxant > /sys/kernel/debug/ieee80211/phy0/ath9k/rx_chainmask;";
        $cmd .= "echo $wifi_txant > /sys/kernel/debug/ieee80211/phy0/ath9k/tx_chainmask;";
    } else {
        $cmd .= "iw phy phy0 set antenna $wifi_txantenna $wifi_rxantenna >/dev/null 2>&1;";
        $cmd .= "uci set wireless.\@wifi-device[0].rxantenna $wifi_rxant >/dev/null 2>&1;";
        $cmd .= "uci set wireless.\@wifi-device[0].txantenna $wifi_txant >/dev/null 2>&1;";
    }
    $cmd .= "uci set wireless.\@wifi-device[0].distance $wifi_distance >/dev/null 2>&1;";
    $cmd .= "uci commit >/dev/null 2>&1;";

    system $cmd;
}


# validate and save configuration

@errors = ();

if($parms{button_save})
{
    if($wifi_proto eq "static")
    {
	if(not validate_netmask($wifi_mask))
	{
	    push @errors, "invalid WiFi netmask";
	}
	elsif(not validate_ip_netmask($wifi_ip, $wifi_mask))
	{
	    push @errors, "invalid WiFi IP address";
	}
    }
	      
    push (@errors, "invalid WiFi SSID") unless length $wifi_ssid <= 32;    
    push (@errors, "invalid WiFi channel") if $wifi_channel < 1 or $wifi_channel > 11;
    push (@errors, "invalid WiFi distance") if $wifi_distance < 0 or $wifi_distance =~ /\D/;

    if($lan_proto eq "static")
    {
	if(not validate_netmask($lan_mask))
	{
	    push @errors, "invalid LAN netmask";
	}
	elsif($lan_mask !~ /^255\.255\.255\./)
	{
	    push @errors, "LAN netmask must begin with 255.255.255";
	}
	elsif(not validate_ip_netmask($lan_ip, $lan_mask))
	{
	    push @errors, "invalid LAN IP address";
	}
	else
	{
	    if($lan_dhcp)
	    {
		my $start_addr = change_ip_address($lan_ip, $dhcp_start);
		my $end_addr   = change_ip_address($lan_ip, $dhcp_end);

		unless(validate_ip_netmask($start_addr, $lan_mask) and
		       validate_same_subnet($start_addr, $lan_ip, $lan_mask))
		{
		    push @errors, "invalid DHCP start address";
		}

		unless(validate_ip_netmask($end_addr, $lan_mask) and
		       validate_same_subnet($end_addr, $lan_ip, $lan_mask))
		{
		    push @errors, "invalid DHCP end address";
		}

		if($dhcp_start > $dhcp_end)
		{
		    push @errors, "invalid DHCP start/end addresses";
		}
	    }

	    if($lan_gw and not
	       (validate_ip_netmask($lan_gw, $lan_mask) and 
		validate_same_subnet($lan_ip, $lan_gw, $lan_mask)))
	    {
		push @errors, "invalid LAN gateway";
	    }
	}
    }

    if($wan_proto eq "static")
    {
	if(not validate_netmask($wan_mask))
	{
	    push @errors, "invalid WAN netmask";
	}
	elsif(not validate_ip_netmask($wan_ip, $wan_mask))
	{
	    push @errors, "invalid WAN IP address";
	}
	else
	{
	    unless (validate_ip_netmask($wan_gw, $wan_mask) and 
		    validate_same_subnet($wan_ip, $wan_gw, $wan_mask))
	    {
		push @errors, "invalid WAN gateway";
	    }
	}
    }
	      
    push (@errors, "invalid WAN DNS 1") unless validate_ip($wan_dns1);
    push (@errors, "invalid WAN DNS 2") if $wan_dns2 ne "" and not validate_ip($wan_dns2);


    if($passwd1 or $passwd2)
    {
	push (@errors, "passwords do not match") if $passwd1 ne $passwd2;
	push (@errors, "passwords cannot contain '#'") if $passwd1 =~ /#/;
	push (@errors, "password must be changed") if $passwd1 eq "hsmm";
    }
    elsif(-f "/etc/config/unconfigured")
    {
	push @errors, "password must be changed during initial configuration";
    }
	      
    if($aprs_lat or $aprs_lon)
    {
	push (@errors, "invalid latitude") unless validate_latitude($aprs_lat);
	push (@errors, "invalid longitude") unless validate_longitude($aprs_lon);
    }

    if($nodetac =~ /\//)
    {
	$nodetac =~ /^\s*([\w\-]+)\s*\/\s*([\w\-]+)\s*$/;
	$node = $1;
	$tactical = $2;
	push(@errors, "invalid node/tactical name") if not $2;
    }
    else
    {
	$node = $nodetac;
	$tactical = "";
	push(@errors, "you must set the node name") if $node eq "";
    }

    if($node and ($node =~ /[^\w\-]/ or $node =~ /_/))
    {
	push(@errors, "invalid node name");
    }

    if($tactical =~ /[^\w\-]/ or $tactical =~ /_/)
    {
	push(@errors, "invalid tactical name");
    }

    if($debug == 3) # don't save the config, just validate it
    {
	push (@errors, "OK") unless @errors;
    }

    unless(@errors)
    {
	$parms{node} = $node;
	$parms{tactical} = $tactical;
	system "touch /tmp/unconfigured" if -f "/etc/config/unconfigured";
	$rc = save_setup("/etc/config.$config/_setup");
	if(-s "/tmp/web/save/node-setup.out")
	{
	    push @errors, `cat /tmp/web/save/node-setup.out`;
	}
	elsif(not $rc)
	{
	    push @errors, "error saving setup";
	}
	reboot_page("/cgi-bin/status") if -f "/tmp/unconfigured" and not @errors;
    }
}

system "rm -rf /tmp/web/save";
reboot_page("/cgi-bin/status") if $parms{button_reboot};


#
# generate the page
#

http_header() unless $debug == 2;
html_header(nvram_get("node") . " setup", 1);
print "<body><center>\n";
alert_banner();
print "<form method=post action=/cgi-bin/setup enctype='multipart/form-data'>\n" unless $debug == 2;
print "<form method=post action=test>\n" if $debug == 2;

print "<table width=790>\n";
print "<tr><td>\n";
navbar("setup");
print "</td></tr>\n";

#
# control buttons
#

print "<tr><td align=center>
<a href='/help.html#setup' target='_blank'>Help</a>
&nbsp;&nbsp;&nbsp;
<input type=submit name=button_save value='Save Changes' title='Store these settings'>&nbsp;
<input type=submit name=button_reset value='Reset Values' title='Revert to the last saved settings'>&nbsp;
<input type=submit name=button_default value='Default Values' title='Set all values to their default'>&nbsp;
<input type=submit name=button_reboot value=Reboot style='font-weight:bold' title='Immediately reboot this node'>
</td></tr>
<tr><td>&nbsp;</td></tr>\n";

# messages

if(@errors)
{
    print "<tr><th>Configuration NOT saved!</th></tr>\n";
    print "<tr><td align=center><table>\n";
    print "<tr><td><ul style='padding-left:0'>\n";
    foreach(@errors) { print "<li>$_</li>\n" }
    print "</ul></td></tr></table>\n";
    print "</td></tr>\n";
}
elsif($parms{button_save})
{
    print "<tr><td align=center>";
    print "<b>Configuration saved.</b><br><br>\n";
    print "</td></tr>\n";
}

if(not @errors and -f "/tmp/reboot-required")
{
    print "<tr><td align=center><h3>Reboot is required for changes to take effect</h3></td></tr>";
}

#
# node name and type, password
#

print "<tr><td align=center>\n";
print "<table cellpadding=5 border=0>

<tr>
<td>Node Name</td>
<td><input type=text name=nodetac value='$nodetac' tabindex=1></td>
<td align=right>Password</td>
<td><input type=password name=passwd1 value='$passwd1' size=8 tabindex=2></td>";

if(0)#$config eq "mesh")
{
    print "<td>&nbsp;</td>";
    print "<td align=right>Latitude</td>";
    print "<td><input type=text size=8 name=aprs_lat value='$aprs_lat' tabindex=4></td>\n";
}

print "
</tr>
<tr>
<td>Node Type</td>
<td><select name=config onChange='form.submit()' tabindex=6>\n";
selopt("Mesh Node", "mesh", $config);
selopt("Mesh Access Point", "mesh_ap", $config);
selopt("Standard Access Point", "ap", $config);
selopt("Wireless Client", "client", $config);
selopt("Wired Router", "router", $config);
#selopt("User", "user", $config, "disabled");
$oldconfig = $config;
print "</select></td>
<td>Verify Password</td>
<td><input type=password name=passwd2 value='$passwd2' size=8 tabindex=3></td>";

if(0)#$config eq "mesh")
{
    print "<td>&nbsp;</td>";
    print "<td align=right>Longitude</td>";
    print "<td><input type=text size=8 name=aprs_lon value='$aprs_lon' tabindex=5></td>\n";
}

print "
</tr>
</table>

</td></tr><tr><td>
<br>

<table cellpadding=5 border=1 width=100%>
<tr><td valign=top width=33%>\n";

#
# WiFi settings
#

print "<table width=100%>
<tr><th colspan=2>WiFi</th></tr>
<tr><td>Protocol</td>
<td>";

#if($config ne "user" and $config ne "client")
if($config ne "user")
{
    push @hidden, "<input type=hidden name=wifi_proto value='$wifi_proto'>";
    print "<select name=wifi_proto disabled>\n";
}
else
{
    print "<select name=wifi_proto onChange='form.submit()'>\n";
}

$dis = "";
$dis = "disabled" if $config eq "client";
selopt("Static", "static", $wifi_proto);
selopt("DHCP", "dhcp", $wifi_proto);
selopt("Bridged", "bridged", $wifi_proto, $dis);
selopt("disabled", "disabled", $wifi_proto, $dis);
print "</select></td>\n</tr>\n";
if($wifi_proto eq "static")
{
    print "<tr><td><nobr>IP Address</nobr></td>\n";
    print "<td><input type=text size=15 name=wifi_ip value='$wifi_ip'></td></tr>\n";
    print "<tr><td>Netmask</td>\n";
    print "<td><input type=text size=15 name=wifi_mask value='$wifi_mask'></td></tr>\n";
}
else
{
    push @hidden, "<input type=hidden name=wifi_ip value='$wifi_ip'>";
    push @hidden, "<input type=hidden name=wifi_mask value='$wifi_mask'>";
}
if($wifi_proto ne "disabled")
{
    print "<tr><td>SSID</td>\n";
    print "<td><input type=text size=15 name=wifi_ssid value='$wifi_ssid'></td></tr>\n";

    if($wifi_mode eq "ap")
    {
	print "<tr><td>Hidden</td>";
	print "<td><input type=checkbox name=wifi_hidden value=1";
	print " checked" if $wifi_hidden;
	print "></td></tr>\n";
    }

    print "<tr><td>Mode</td>\n";

    if($config ne "user")
    {
	push @hidden, "<input type=hidden name=wifi_mode value='$wifi_mode'>";
	print "<td><select name=wifi_mode disabled>\n";
    } else {
	print "<td><select name=wifi_mode>\n";
    }

    selopt("Access Point", "ap", $wifi_mode);
    selopt("Client", "sta", $wifi_mode);
    selopt("Ad-Hoc", "adhoc", $wifi_mode);
    print "</select></td></tr>\n";

    if($wifi_mode ne "sta")
    {
	print "<tr><td>Channel</td>\n";
	print "<td><select name=wifi_channel>\n";
	for($i = 1; $i <= 11; ++$i) { selopt($i, $i, $wifi_channel) }
	print "</select></td></tr>\n";
    }
    else
    {
	push @hidden, "<input type=hidden name=wifi_channel value='$wifi_channel'>";
    }

    print "<tr><td colspan=2 align=center><hr><small>Active Settings</small></td></tr>\n";

    print "<tr><td><nobr>Rx Antenna</nobr></td>\n";
    print "<td><select name=wifi_rxant>\n";
    %validants = wifi_validant();                            
    while (($value, $name) = each (%validants)){             
    selopt($name, $value, $wifi_rxant);                      
    }
    print "</select></td></tr>\n";

    print "<tr><td><nobr>Tx Antenna</nobr></td>\n";
    print "<td><select name=wifi_txant>\n";
    %validants = wifi_validant();                            
    while (($value, $name) = each (%validants)){             
    selopt($name, $value, $wifi_txant);                      
    }
    print "</select></td></tr>\n";

    print "<tr><td><nobr>Tx Power</nobr></td>\n";
    print "<td><select name=wifi_txpower>\n";
    for($i = wifi_maxpower(); $i >= 1; --$i) { selopt($i+wifi_txpoweroffset()." dBm", $i, $wifi_txpower) }
    print "</select></td></tr>\n";

    print "<tr><td>Distance</td>\n";
    print "<td><input type=text size=8 name=wifi_distance value='$wifi_distance' title='Distance in meters to the farthest neighbor; 0=automatic'></td></tr>\n";

    print "<tr><td></td><td><input type=submit name=button_apply value=Apply title='Immediately use these active settings'></td></tr>\n";
}
else
{
    push @hidden, "<input type=hidden name=wifi_ssid value='$wifi_ssid'>";
    push @hidden, "<input type=hidden name=wifi_mode value='$wifi_mode'>";
    push @hidden, "<input type=hidden name=wifi_channel value='$wifi_channel'>";
}
print "</table></td>\n";


#
# LAN settings
#

print "<td valign=top width=33%><table width=100%>
<tr><th colspan=2>LAN</th></tr>
<tr>
<td>LAN Mode</td>
<td><select name=dmz_mode onChange='form.submit()'";
print " disabled" unless $config eq "mesh";
print ">\n";
selopt("NAT", 0, $dmz_mode);
selopt("1 host Direct", 2, $dmz_mode);
selopt("5 host Direct", 3, $dmz_mode);
selopt("13 host Direct", 4, $dmz_mode);
print "</select></td>\n</tr>\n";
push @hidden, "<input type=hidden name=lan_proto value='static'>";

if($dmz_mode)
{
    print "<tr><td><nobr>IP Address</nobr></td>";
    #print "<td><input type=text size=15 name=dmz_lan_ip value='$dmz_lan_ip' disabled></td></tr>\n";
    print "<td>$dmz_lan_ip</td></tr>\n";
    push @hidden, "<input type=hidden name=dmz_lan_ip value='$dmz_lan_ip'>";
    
    print "<tr><td>Netmask</td>";
    #print "<td><input type=text size=15 name=dmz_lan_mask value='$dmz_lan_mask' disabled></td></tr>\n";
    print "<td>$dmz_lan_mask</td></tr>\n";
    push @hidden, "<input type=hidden name=dmz_lan_mask value='$dmz_lan_mask'>";
    
    print "<tr><td><nobr>DHCP Server</nobr></td>";
    print "<td><input type=checkbox name=lan_dhcp value=1";
    print " checked" if $lan_dhcp;
    print "></td></tr>\n";

    print "<tr><td><nobr>DHCP Start</nobr></td>";
    #print "<td><input type=text size=4 name=dmz_dhcp_start value='$dmz_dhcp_start' disabled></td></tr>\n";
    print "<td>$dmz_dhcp_start</td></tr>\n";
    push @hidden, "<input type=hidden name=dmz_dhcp_start value='$dmz_dhcp_start'>";

    print "<tr><td><nobr>DHCP End</nobr></td>";
    #print "<td><input type=text size=4 name=dmz_dhcp_end value='$dmz_dhcp_end' disabled></td></tr>\n";
    print "<td>$dmz_dhcp_end</td></tr>\n";
    push @hidden, "<input type=hidden name=dmz_dhcp_end value='$dmz_dhcp_end'>";

    push @hidden, "<input type=hidden name=dmz_dhcp_limit value='$dmz_dhcp_limit'>";

    push @hidden, "<input type=hidden name=lan_ip     value='$lan_ip'>";
    push @hidden, "<input type=hidden name=lan_mask   value='$lan_mask'>";
    push @hidden, "<input type=hidden name=dhcp_start value='$dhcp_start'>";
    push @hidden, "<input type=hidden name=dhcp_end   value='$dhcp_end'>";
}
else
{
    print "<tr><td><nobr>IP Address</nobr></td>";
    print "<td><input type=text size=15 name=lan_ip value='$lan_ip'></td></tr>\n";
    
    print "<tr><td>Netmask</td>";
    print "<td><input type=text size=15 name=lan_mask value='$lan_mask'></td></tr>\n";
    
    if($wan_proto eq "disabled" and $wifi_proto ne "dhcp")
    {
	print "<tr><td>Gateway</td>";
	print "<td><input type=text size=15 name=lan_gw value='$lan_gw' title='leave blank if not needed'></td></tr>\n";	
    }

    print "<tr><td><nobr>DHCP Server</nobr></td>";
    print "<td><input type=checkbox name=lan_dhcp value=1";
    if($config eq "mesh_ap")
    {
	print " disabled";
	push @hidden, "<input type=hidden name=lan_dhcp value='$lan_dhcp'>";
    }
    print " checked" if $lan_dhcp;
    print "></td></tr>\n";

    print "<tr><td><nobr>DHCP Start</nobr></td>";
    print "<td><input type=text size=4 name=dhcp_start value='$dhcp_start'";
    if($config eq "mesh_ap")
    {
	print " disabled";
	push @hidden, "<input type=hidden name=dhcp_start value='$dhcp_start'>";
    }
    print "></td></tr>\n";

    print "<tr><td><nobr>DHCP End</nobr></td>";
    print "<td><input type=text size=4 name=dhcp_end value='$dhcp_end'";
    if($config eq "mesh_ap")
    {
	print " disabled";
	push @hidden, "<input type=hidden name=dhcp_end value='$dhcp_end'>";
    }
    print "></td></tr>\n";

    push @hidden, "<input type=hidden name=dhcp_limit value='$dhcp_limit'>";

    push @hidden, "<input type=hidden name=dmz_lan_ip     value='$dmz_lan_ip'>";
    push @hidden, "<input type=hidden name=dmz_lan_mask   value='$dmz_lan_mask'>";
    push @hidden, "<input type=hidden name=dmz_dhcp_start value='$dmz_dhcp_start'>";
    push @hidden, "<input type=hidden name=dmz_dhcp_end   value='$dmz_dhcp_end'>";
}

if($config eq "mesh" and 0) # disable for now
{
    print "<tr><td colspan=2><hr></td></tr>\n";
    print "<tr><td><nobr><i>Mesh Bridge</i></nobr></td>\n";
    print "<td><input type=checkbox name=olsrd_bridge value=1";
    print " checked" if $olsrd_bridge;
    print "></td></tr>\n";
}

print "</table></td>\n";


#
# WAN settings
#

print "<td valign=top width=33%><table width=100%>
<tr><th colspan=2>WAN</th></tr>
<tr>
<td width=50%>Protocol</td>\n";

if($config ne "client" and $config ne "mesh_ap")
{
    print "<td><select name=wan_proto onChange='form.submit()'>\n";
}
else
{
    push @hidden, "<input type=hidden name=wan_proto value='$wan_proto'>";
    print "<td><select name=wan_proto disabled>\n";
}

selopt("Static", "static", $wan_proto);
selopt("DHCP", "dhcp", $wan_proto);
selopt("disabled", "disabled", $wan_proto);
print "</select></td>\n</tr>\n";

if($wan_proto eq "static")
{
    print "<tr><td><nobr>IP Address</nobr></td>\n";
    print "<td><input type=text size=15 name=wan_ip value='$wan_ip'></td></tr>\n";
    print "<tr><td>Netmask</td>\n";
    print "<td><input type=text size=15 name=wan_mask value='$wan_mask'></td></tr>\n";
    print "<tr><td>Gateway</td>\n";
    print "<td><input type=text size=15 name=wan_gw value='$wan_gw'></td></tr>\n";
}
else
{
    push @hidden, "<input type=hidden name=wan_ip value='$wan_ip'>";
    push @hidden, "<input type=hidden name=wan_mask value='$wan_mask'>";
    push @hidden, "<input type=hidden name=wan_gw value='$wan_gw'>";
}

print "<tr><td><nobr>DNS 1</nobr></td>\n";
print "<td><input type=text size=15 name=wan_dns1 value='$wan_dns1'></td></tr>\n";
print "<tr><td><nobr>DNS 2</nobr></td>\n";
print "<td><input type=text size=15 name=wan_dns2 value='$wan_dns2'></td></tr>\n";

if($config eq "mesh")
{
    print "<tr><td colspan=2><hr></td></tr>\n";
    print "<tr><td><nobr>Mesh Gateway</nobr></td>\n";
    print "<td><input type=checkbox name=olsrd_gw value=1 title='Allow this node to provide internet access to all other nodes'";
    print " checked" if $olsrd_gw;
    print "></td></tr>\n";
}

print "</table>

</td></tr>
</table><br>

</td></tr>\n";

print "</table>\n";

push @hidden, "<input type=hidden name=oldconfig value='$oldconfig'>";
push @hidden, "<input type=hidden name=reload value=1>";
foreach(@hidden) { print "$_\n" }

print "</form></center>\n";

show_debug_info();

if($debug)
{
    print "<br><b>config</b><br>\n";
    foreach(sort keys %cfg)
    {
	$tmp = $cfg{$_};
	$tmp =~ s/ /\(space\)/g;
	if($cfg{$_} eq "") { print "$_ = (null)<br>\n" }
	else               { print "$_ = $tmp<br>\n" }
    }
}

show_parse_errors();

print "</body>\n";
print "</html>\n";