rewrote

perftest.pl

 #!/usr/bin/perl
 
 use strict;
+use IO::Socket::INET;
+use Time::HiRes qw(sleep);
 use warnings;
 
+$| = 1;
 
-my($maccnt, $pps, $src, $dest) = @ARGV;
 
-usage() if !defined $dest;
 
-if ( $maccnt !~ /^\d+$/ || $maccnt < 1 ) {
-	print STDERR "MAC count must be a positive integer\n";
+my($clients, $leasetime, $floodclients, $floodpps, $dest, $destport) = @ARGV;
+
+usage() if !defined $destport;
+
+if ( $clients !~ /^\d+$/ || $clients < 1 ) {
+	print STDERR "clients count must be a positive integer\n";
+	exit 1;
+}
+
+if ( $leasetime !~ /^\d+$/ || $leasetime < 3 ) {
+	print STDERR "leasetime must be at least 3\n";
 	exit 1;
 }
 
-if ( $pps !~ /^\d+$/ || $pps < 1 ) {
-	print STDERR "packets/sec must be a positive integer\n";
+if ( $floodclients !~ /^\d+$/ || $floodclients < 0 ) {
+	print STDERR "floodclients must be a 0 or more\n";
 	exit 1;
 }
 
-if ( $src !~ /^(\d+\.\d+\.\d+\.\d+)$/ ) {
-	print STDERR "source IP must be a valid IPv4 address\n";
+if ( $floodpps !~ /^\d+$/ || $floodpps < 0 ) {
+	print STDERR "floodpps must be 0 or more\n";
 	exit 1;
 }
 
 	exit 1;
 }
 
-main($maccnt, $pps, $src, $dest);
+if ( $destport !~ /^\d+$/ || $destport < 1 || $destport > 65535 ) {
+	print STDERR "destport must be between 1 and 65535\n";
+	exit 1;
+}
+
+main($clients, $leasetime, $floodclients, $floodpps, $dest, $destport);
 
 sub usage {
-	print STDERR "DHCP Flood using option 82\n";
-	print STDERR "This is only to test dhcp_protect, the DHCP packets aren't really valid\n";
-	print STDERR "DO NOT SEND THIS TO YOUR DHCP SERVER !!!!\n";
-	print STDERR "\n";
-	print STDERR "Usage: $0 <MAC count> <packets/sec> <source IPv4> <destination IPv4>\n";
-	print STDERR "Dependency: nemesis must be installed\n";
-	print STDERR "https://ftp.troglobit.com/nemesis/\n";
-	print STDERR "\n";
+	print STDERR <<EOF;
+
+==============================================
+= DHCP Protect testing client                =
+= This is only to test dhcp_protect          =
+= DO NOT SEND THIS TO YOUR DHCP SERVER !!!!  =
+==============================================
+
+Usage: $0 <clients> <leasetime> <floodclients> <floodpps> <destination> <port>
+
+clients      : number of 'normal' dhcp clients to simulator.
+leasetime    : the desired leasetime.
+floodclients : number of client flood the server.
+floodpps     : packet rate at which the floodclients flood the server (per client).
+destination  : target IP address.
+port         : targer UDP port.
+EOF
 	exit 1;
 }
 
 
 sub main {
-	my($maccnt, $pps, $src, $dest)=@_;
+	my($clients, $leasetime, $floodclients, $floodpps, $dest, $destport)=@_;
+
+	# pseudo packet, the only really relevant thing
+	# is that option 82 is present and at the right place
 	my $hdr = "";
 
-	$hdr .= "010106010c02385600010000000000000000000000000000c16e5f43409c28db";
-	$hdr .= "d56c000000000000000000000000000000000000000000000000000000000000";
-	$hdr .= "0000000000000000000000000000000000000000000000000000000000000000";
-	$hdr .= "0000000000000000000000000000000000000000000000000000000000000000";
-	$hdr .= "0000000000000000000000000000000000000000000000000000000000000000";
-	$hdr .= "0000000000000000000000000000000000000000000000000000000000000000";
-	$hdr .= "0000000000000000000000000000000000000000000000000000000000000000";
-	$hdr .= "000000000000000000000000638253633501013707017903060f77fc390205dc";
-	$hdr .= "3d0701409c28dbd56c33040076a7000c097370616c6569666f6e000000000000";
-	$hdr .= "0000000000000000000000520e0104000000000206XXXXXXXXXXXXff00000000";
+	$hdr .= pack("H2","01"); # Opcode, bootrequest
+	$hdr .= pack("H2","01"); # Hardware type, ethernet
+	$hdr .= pack("H2","06"); # HW addr len, MAC = 6
+	$hdr .= pack("H2","01"); # hops, 1 relay
+	$hdr .= pack("H8","00000000"); # transaction ID
+	$hdr .= pack("H4","0000"); # secs
+	$hdr .= pack("H4","0000"); # flags
+	$hdr .= pack("H8","00000000"); # ciaddr
+	$hdr .= pack("H8","00000000"); # yiaddr
+	$hdr .= pack("H8","00000000"); # siaddr
+	$hdr .= pack("H8","00000000"); # giaddr
+	$hdr .= pack("H32","0"x32); # cihwaddr
+	$hdr .= pack("H128","0"x128); # hostname
+	$hdr .= pack("H256","0"x256); # boot filename
+	$hdr .= pack("H8","63825363"); # magic cookie
+
+	$hdr .= pack("C", 82); # opt 82
+	$hdr .= pack("C", 21); # opt 82 len
+	$hdr .= pack("C", 1); # subopt 1 (circuitid)
+	$hdr .= pack("C", 11); # subopt 1 len
+	$hdr .= "Hello World";
+	$hdr .= pack("C", 2); # subopt 2 (remoteid)
+	$hdr .= pack("C", 6); # subopt 2 len (mac)
+
+
+	if ( $floodclients > 0 ) {
+		my $pid = fork();
+		# flood client
+		if ( !$pid ) {
+
+			my $int = 1/$floodpps/$floodclients;
+			my $sock = IO::Socket::INET->new(
+				Proto => 'udp',
+				PeerAddr => "$dest:$destport",
+			);
+
+			while(1) {
+				for(my $i=0; $i<$floodclients; $i++) {
+					my $pkt = $hdr;
+					$pkt .= pack("H12", sprintf("66666666%04x", $i));
+					$sock->send($pkt);
+					sleep($int);
+				}
+			}
+			exit;
+		}
+	}
 
-	my $int = 1/$pps;
+	my $int = $leasetime/3/$clients;
+	my $sock = IO::Socket::INET->new(
+		Proto => 'udp',
+		PeerAddr => "$dest:$destport",
+	);
 
 	while(1) {
-		for(my $i=0; $i<$maccnt; $i++) {
-			my $mac = sprintf("000000%06x", $i);
+		for(my $i=0; $i<$clients; $i++) {
 			my $pkt = $hdr;
-			$pkt =~ s/XXXXXXXXXXXX/$mac/;
-	
-			open(N,"| nemesis udp -S $src -D $dest -x 67 -y 666 -i $int -P -") || die "install nemesis!";
-			print N pack("H*",$pkt);
-			print N "";
-			close(N);
+			$pkt .= pack("H12", sprintf("00112233%04x",$i));
+			$sock->send($pkt);
+			sleep($int);
 		}
 	}
 }