#!/usr/bin/perl
=for commnet

  Part of AREDN -- Used for creating Amateur Radio Emergency Data Networks
  Copyright (C) 2015 Conrad Lara
   See Contributors file for additional contributors

  Copyright (c) 2013 David Rivenburg et al. BroadBand-HamNet

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation version 3 of the License.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

  Additional Terms:

  Additional use restrictions exist on the AREDN(TM) trademark and logo.
    See AREDNLicense.txt for more info.

  Attributions to the AREDN Project must be retained in the source code.
  If importing this code into a new or existing project attribution
  to the AREDN project must be added to the source code.

  You must not misrepresent the origin of the material conained within.

  Modified versions must be modified to attribute to the original source
  and be marked in reasonable ways as differentiate it from the original
  version.

=cut

$debug = 0;

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

# collect some variables
$node = nvram_get("node");
$node = "NOCALL" if $node eq "";
$tactical = nvram_get("tactical");
$config = nvram_get("config");
$config = "not set" if $config eq "" or not -d "/etc/config.$config";
($my_ip) = get_ip4_network(get_interface("wifi"));

read_postdata();

system "mkdir -p /tmp/web";
system "touch /tmp/web/automesh" if $parms{auto};
system "rm -f /tmp/web/automesh" if $parms{stop};

# parse the txtinfo output

$table = "none";
chomp($tmperr = `mktemp /tmp/web/nc.XXXXXX`);

foreach(`echo /all | nc 127.0.0.1 2006 2>$tmperr`)
{
    if(/^Table: (\w+)/)
    {
	$table = $1;
	next;
    }

    next if /^\s*$/ or /^\D/;

    if($table eq "Links")
    {
	($junk, $ip, $junk, $lq) = split /\s+/, $_;
	$links{$ip} = $lq;
    }
    elsif($table eq "Neighbors")
    {
    }
    elsif($table eq "Topology")
    {
    }
    elsif($table eq "HNA")
    {
    }
    elsif($table eq "MID")
    {
    }
    elsif($table eq "Routes")
    {
	($ip, $junk, $junk, $etx) = split /\s+/, $_;
	($net, $cidr) = split /\//, $ip;
	$routes{$net}{cidr} = $cidr;
	$routes{$net}{etx} = $etx;
	$routes{$net}{value} = ip2decimal($net);
	$routes{$net}{mask} = 0xffffffff - ((1 << (32 - $cidr)) - 1);
    }
}

# stat and -s do not work in microperl
@parts = split /\s+/, `ls -l $tmperr`;
$txtinfo_err = $parts[4];
unlink $tmperr;

# load the local hosts file
foreach(`cat /etc/hosts`)
{
    next unless /^10[.]/;
    chomp;
    ($ip, $name, $tactical) = split /\s+/, $_;
    next if $name =~ /^(localhost|localnode|localap|dtdlink\..*)$/;
    if($ip eq $my_ip)
    {
	$tactical = "" unless $tactical;
	$localhosts{$ip}{tactical} = $tactical;
	$localhosts{$ip}{name} = $name;
    }
    else
    {
	push @{$localhosts{$my_ip}{hosts}}, $name;
    }
}

# load the olsr hosts file
foreach(`cat /var/run/hosts_olsr 2>/dev/null`)
{
    next unless /^\d/;
    chomp;
    ($ip, $name, $junk, $originator, $mid, $midnum) = split /\s+/, $_;
    next unless $originator;
    next if $originator eq "myself";
    if ( $name =~ /^dtdlink\..*$/ )
    {
        $hosts{$ip}{name} = $name;
        $hosts{$ip}{hide} = 1;
        next;
    }

    if(defined $mid and $midnum =~ /^\#(\d+)/)
    {
        if ( !exists $hosts{$ip}{name} )
        {
            $hosts{$ip}{name} = $name;
        }
	$hosts{$ip}{hide} = 1;
	$hosts{$originator}{mid} = $1;
    }
    elsif($ip eq $originator)
    {
	if($hosts{$ip}{name}) { $hosts{$ip}{tactical} = $name }
	else                  { $hosts{$ip}{name} = $name }
    }
    else
    {
	push @{$hosts{$originator}{hosts}}, $name;
    }
}

# load the olsr services file
foreach(`cat /var/run/services_olsr 2>/dev/null`)
{
    next unless /^\w/;
    chomp;
    ($url, $junk, $name) = split /\|/, $_;
    next unless defined $name;
    ($protocol, $host, $port, $path) = $url =~ /^(\w+):\/\/([\w\-\.]+):(\d+)\/(.*)/;
    next unless defined $path;
    ($name, $originator) = split /\#/, $name;
    $name =~ s/\s+$//;

    if ( $host !~ /\./ )
    {
      $host="${host}.local.mesh";
    }

    #$host = $originator eq " my own service" ? $node : $hosts{$originator}{name};

    # attempt to work around olsr never forgetting defunct services
    # assume that the first entry in the file by this name is the most recent, ignore the rest
    next if $services{$host}{$name};

    $services{$host}{$name} = $port ? "<a href='${protocol}://${host}:${port}/${path}'>$name</a>" : $name;
}

# load the node history
foreach(`cat /tmp/node.history 2>/dev/null`)
{
    chomp;
    ($ip, $age, $host) = split / /, $_;
    next unless $age;
    $host = "" unless $host;
    $host =~ s|/| / |;
    $history{$ip}{age} = $age;
    $history{$ip}{host} = $host;
}

#delete $hosts{"127.0.0.1"};


# generate the page
http_header();
html_header("$node mesh status", 0);
print "<meta http-equiv='refresh' content='10;url=/cgi-bin/mesh'>\n" if -f "/tmp/web/automesh";
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><form method=post action=/cgi-bin/mesh enctype='multipart/form-data'>\n";
print "<input type=hidden name=reload value=1>\n";
print "<center>\n";

alert_banner();

# page header
print "<h1>$node mesh status</h1><hr><nobr>";

# nav buttons
if(-f "/tmp/web/automesh")
{
    print "<input type=submit name=stop value=Stop title='Abort continuous status'>\n";
}
elsif($config eq "mesh")
{
    print "<input type=submit name=refresh value=Refresh title='Refresh this page'>\n";
    print "&nbsp;&nbsp;&nbsp;\n";
    print "<input type=submit name=auto value=Auto title='Automatic page refresh'>\n";
}

print "&nbsp;&nbsp;&nbsp";
print "<button type=button onClick='window.location=\"status\"' title='Return to the status page'>Quit</button>\n";

if($config ne "mesh")
{
    print "<br><br><b>This page is available only when the router is acting as a Mesh Node.</b>\n";
    print "</center></form>";
    page_footer();
    print "</body></html>\n";
    exit;
}
elsif($txtinfo_err)
{
    print "<br><br><b>Whoops! OLSR is not running, try again later.</b>\n";
    print "</center></form>";
    page_footer();
    print "</body></html>\n";
    exit;
}

print "</nobr><br><br>\n";

unless(keys %localhosts or keys %links)
{
    print "No other nodes are available.\n";
    print "</center></form>";
    page_footer();
    print "</body></html\n";
    exit;
}


print "<table><tr><td valign=top><table>\n";


# show local hosts

print "<tr><th colspan=4 align=left><nobr>Local Hosts</nobr></th><th align=left>Services</th></tr>\n";
print "<tr><td colspan=5><hr></td></tr>\n";

if(keys %localhosts)
{
    %rows = ();

    foreach $ip (keys %localhosts)
    {
	$host = $localhosts{$ip}{name} . ".local.mesh";
	$tactical = $localhosts{$ip}{tactical} ? " / " . $localhosts{$ip}{tactical} : "";
	$rows{$host} = sprintf "<tr><td valign=top><nobr>%s</nobr></td><td colspan=3>&nbsp;</td><td>\n", $host . $tactical;
	foreach(sort keys %{$services{$host}})
	{
	    $rows{$host} .= "<nobr>" . $services{$host}{$_} . "</nobr><br>\n";
	}
	$rows{$host} .= "</td></tr>\n";

	# add locally advertised dmz hosts
	foreach $dmzhost (@{$localhosts{$ip}{hosts}})
	{
	    $rows{$host} .= "<tr><td valign=top><nobr>&nbsp;<img src='/dot.png'>$dmzhost</nobr></td>";
	    $rows{$host} .= "<td colspan=3></td><td>\n";
	    foreach(sort keys %{$services{$dmzhost}})
	    {
		$rows{$host} .= "<nobr>" . $services{$dmzhost}{$_} . "</nobr><br>\n";
	    }
	    $rows{$host} .= "</td></tr>\n";
	}
    }

    foreach(sort keys %rows) { print $rows{$_} }
}
else
{
    print "<tr><td>none</td></tr>\n";
}


# show remote nodes

print "<tr><td>&nbsp;</td></tr>\n";
print "<tr><th align=left><nobr>Remote Nodes</nobr></th><th>&nbsp;&nbsp;</th><th>ETX</th><th>&nbsp;&nbsp;</th><th align=left>Services</th></tr>\n";
print "<tr><td colspan=5><hr></td></tr>\n";

%rows = ();
foreach $ip (keys %hosts)
{
    next if $links{$ip};
    next if exists $hosts{$ip}{hide};
    $host = $hosts{$ip}{name};
    $tactical = $hosts{$ip}{tactical} ? " / " . $hosts{$ip}{tactical} : "";
    $etx = "unknown";

    if ( $host !~ /\./ ) 
    {
      $host="${host}.local.mesh";
    }

    if($routes{$ip}) # get the etx directly
    {
	$etx = sprintf "%.2f", $routes{$ip}{etx};
    }
    else # find the subnet it belongs to
    {
	foreach $net (keys %routes)
	{
	    next unless (ip2decimal($ip) & $routes{$net}{mask}) == $routes{$net}{value};
	    $etx = sprintf "%.2f", $routes{$net}{etx};
	    last;
	}
    }

    next if $etx eq "unknown";
    $rows{$host}  = sprintf "<tr><td valign=top><nobr><a href='http://%s:8080/'>%s</a>", $host, $host . $tactical;
    if($midnum = $hosts{$ip}{mid}) # show mid interfaces
    {
	$midnum = ($midnum > 1) ? "*$midnum" : "";
	$rows{$host} .= " &nbsp; <small>(mid$midnum)</small>";
    }
    $rows{$host} .= sprintf "</nobr></td><td></td><td align=right valign=top>%s</td><td></td><td>\n", $etx;
    foreach(sort keys %{$services{$host}})
    {
	$rows{$host} .= "<nobr>" . $services{$host}{$_} . "</nobr><br>\n";
    }
    $rows{$host} .= "</td></tr>\n";

    # add advertised dmz hosts
    foreach $dmzhost (@{$hosts{$ip}{hosts}})
    {
	$rows{$host} .= "<tr><td valign=top><nobr>&nbsp;<img src='/dot.png'>$dmzhost</nobr></td>";
	$rows{$host} .= "<td colspan=3></td><td>\n";
	foreach(sort keys %{$services{$dmzhost}})
	{
	    $rows{$host} .= "<nobr>" . $services{$dmzhost}{$_} . "</nobr><br>\n";
	}
	$rows{$host} .= "</td></tr>\n";
    }
}

if(keys %rows)
{
    foreach(sort keys %rows) { print $rows{$_} }
}
else
{
    print "<tr><td>none</td></tr>\n";
}


print "</table></td><td width=20>&nbsp;</td><td valign=top><table>\n";


# show current neighbors

print "<tr><th align=left><nobr>Current Neighbors</nobr></th><th>&nbsp;&nbsp;</th><th>LQ</th><th>&nbsp;&nbsp;</th><th align=left>Services</th></tr>\n";
print "<tr><td colspan=5><hr></td></tr>\n";

if(keys %links)
{
    %rows = ();

    foreach $ip (keys %links)
    {
	$host = $hosts{$ip}{name} ? $hosts{$ip}{name} : $ip;
	$tactical = $hosts{$ip}{tactical} ? " / " . $hosts{$ip}{tactical} : "";

        if ( $host !~ /\./ )
        {
          $host="${host}.local.mesh";
        }

	$rows{$host} = sprintf "<tr><td valign=top><nobr><a href='http://%s:8080/'>%s</a>", $host, $host . $tactical;

	if($midnum = $hosts{$ip}{mid}) # show mid interfaces
	{
	    $midnum = ($midnum > 1) ? "*$midnum" : "";
	    $rows{$host} .= " &nbsp; <small>(mid$midnum)</small>";
	}

	$rows{$host} .= sprintf "</nobr></td><td></td><td align=right valign=top>%.0f%%</td><td></td><td>\n", 100*$links{$ip};
	foreach(sort keys %{$services{$host}}) { $rows{$host} .= "<nobr>" . $services{$host}{$_} . "</nobr><br>\n" }
	$rows{$host} .= "</td></tr>\n";

	# add advertised dmz hosts
	foreach $dmzhost (@{$hosts{$ip}{hosts}})
	{
	    $rows{$host} .= "<tr><td valign=top><nobr>&nbsp;<img src='/dot.png'>$dmzhost</nobr></td><td colspan=3></td><td>\n";
	    foreach(sort keys %{$services{$dmzhost}}) { $rows{$host} .= $services{$dmzhost}{$_} . "<br>\n" }
	    $rows{$host} .= "</td></tr>\n";
	}
    }

    foreach(sort keys %rows) { print $rows{$_} }
}
else
{
    print "<tr><td>none</td></tr>\n";
}


# show previous neighbors

print "<tr><td>&nbsp;</td></tr>\n";
print "<tr><th colspan=4 align=left><nobr>Previous Neighbors</nobr></th><th align=left>When</th></tr>\n";
print "<tr><td colspan=5><hr></td></tr>\n";
%rows = ();
($uptime) = `cat /proc/uptime` =~ /^(\d+)/;

foreach $ip (keys %history)
{
    next if $links{$ip};
    $age = sprintf "%010d", $uptime - $history{$ip}{age};
    $host = $history{$ip}{host} ? $history{$ip}{host} : $ip;
    $rows{$age} .= sprintf "<tr><td colspan=4><nobr>%s</nobr>", $host;
    foreach(@{$hosts{$ip}{hosts}}) { $rows{$age} .= "<br><nobr><img src='/dot.png'>$_</nobr>" }
    $rows{$age} .= "</td><td valign=top><nobr>";
    if($age < 3600)
    {
	$val = int($age/60);
	$rows{$age} .= $val == 1 ? "1 minute ago" : "$val minutes ago";
    }
    else
    {
	$val = sprintf "%.1f", $age/3660;
	$rows{$age} .= $val eq "1.0" ? "1 hour ago" : "$val hours ago";
    }
    $rows{$age} .= "</nobr></td></tr>\n";
}

if(keys %rows)
{
    foreach(sort keys %rows) { print $rows{$_} }
}
else
{
    print "<tr><td>none</td></tr>\n";
}


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


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

if($debug)
{
    print "<pre>\n";
    print "localhosts\n";
    foreach $ip (sort keys %localhosts)
    {
	printf "%s %s", $ip, $localhosts{$ip}{name};
	printf "/%s", $localhosts{$ip}{tactical} if $localhosts{$ip}{tactical};
	foreach(@{$localhosts{$ip}{hosts}}) { print ":$_" }
	print "\n";
    }

    print "\nhosts\n";
    foreach $ip (sort keys %hosts)
    {
	$hosts{$ip}{name} = "" unless $hosts{$ip}{name};
	printf "%s %s", $ip, $hosts{$ip}{name};
	printf "/%s", $hosts{$ip}{tactical} if $hosts{$ip}{tactical};
	foreach(@{$hosts{$ip}{hosts}}) { print ":$_" }
	printf(" %d", $hosts{$ip}{mid}) if $hosts{$ip}{mid};
	print "\n";
    }    

    print "\nlinks\n";
    foreach(sort keys %links)
    {
	print "$_\n";
    }    

    print "</pre>\n";
}

show_debug_info();
show_parse_errors();

page_footer();
print "</body>\n";
print "</html>\n";