I have generated an XML file with following command: nmap -PE -oX - $range > /home/users/axiroot/scripts/monitor-client/tmp/nmap.xml and parse it with following code: 
my @IPsinrange = &getAllIPs($range) ;
my $np = new Nmap::Parser;
$np->parsefile('/home/users/axiroot/scripts/monitor-client/tmp/nmap.xm
+l'); #using filenames

my $si = $np->get_session();
#my @MACsinrange = &getAllMACs($range,)
foreach my $ip (@IPsinrange) {
    $output .= "<tr>\n" ; 
    $output .= "<th>$ip</th>\n" ;    
    for my $host_obj ($np->all_hosts()){
        if ( $host_obj->ipv4_addr() eq $ip ){
            my $state = "";
            $state = $host_obj->status() ;
            if ( $state eq "up" ) {
                $output .= "<td align='center'>$state</td>\n" ;       
+     
                my $hostname = $host_obj->hostname() ;
                if ( $hostname eq 0 ) {
                    $hostname = "Hostname niet gekend" ;            
                }
                #print "hostname: $hostname \n" ; 
                $output .= "<td align='center'>$hostname</td>\n" ;
                my $a  = nslookup(host => $ip, type => "PTR");
                if ( $a eq ""){
                $output .= "<td align='center'>Niet in DNS</td>\n" ;  
+              
                } else {
                $output .= "<td align='center'>$a</td>\n" ;           
+     
                }
                my $openPort = (join ',',$host_obj->tcp_ports('open'))
+."\n" ;
                my @ports = split ',', $openPort;
                $output .= "<td align='left'>";
                foreach my $port (@ports) {
                    my $svc = $host_obj->tcp_service($port);
                    my $service = $svc->name() ;                    
                    #$output .= "$port : $service </br>" ;
                    $output .= "$port : $service </br>" ;
                }
                $output .= "</td>\n" ;                
                my $mac = $host_obj->mac_addr() ;
                $output .= "<td align='center'>$mac</td>\n" ;         
+       
                my $type = $host_obj->mac_vendor() ;
                $output .= "<td align='center'>$type</td>\n" ;        
+    
            }            
        }
    }    
    $output .= "<tr>\n" ;
}

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When I delete the section of tcp ports, the script runs without any speed problems. However, as soon as I want to parse the tcp ports output, the script takes very long. For instance a range of 4 addresses takes up to 20 minutes for the script to complete. That's doable but with a /24, this is simply too long. Now I have read that this kind of nmap port scanning takes a long time but is there something wrong with my code that makes it very slow? Perl newbie here so I think that could be the case :)

In reply to NMAP Parser very slow by Noosrep

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