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ftest
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#!/usr/bin/perl
#
# FTester client v1.0
# Copyright (C) 2001-2006 Andrea Barisani <[email protected]>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
use strict;
use Getopt::Std;
use POSIX;
use Net::RawIP;
use NetPacket::IP qw(:strip);
use NetPacket::TCP;
use NetPacket::UDP;
getopts('c:d:e:Ff:g:k:m:p:rs:t:v');
our($opt_c, $opt_d, $opt_e, $opt_f, $opt_F, $opt_g, $opt_k, $opt_m, $opt_p, $opt_r, $opt_s, $opt_t, $opt_v);
die
"FTester client v1.0\nCopyright (C) 2001-2006 Andrea Barisani <andrea\@inversepath.com>\n\nConfiguration options:\n -f <conf_file>\n -c <source_ip>:<source_port>:<dest_ip>:<dest_port>:<flags>:<protocol>:<tos>\n -v <verbose>\n\nTiming options:\n -d <delay, 0.25 = 250 ms>\n -s <sleep time, 1 = 1 s>\n\nEvasion options:\n -e <evasion method>\n -t <ids_ttl>\n\nConnection options:\n -r <reset connection>\n -F <end connection>\n -g <IP fragments number, es. 4|IP fragments size, es. 16b>\n -p <TCP segments number, es. 4|TCP segments size, es 6b>\n -k <cksum value, es. 60000>\n -m <marker>\n\n"
unless ($opt_f || $opt_c);
my $delay = $opt_d || 0.01;
my $sleep = $opt_s || 1;
my $fragment = $opt_g || 0;
my $segments = $opt_p || 0;
my $evasion = $opt_e || 0;
my $verbose = $opt_v || 0;
my $reset = $opt_r;
my $finish = $opt_F;
my $checksum = $opt_k;
my $ids_ttl = $opt_t;
my $marker = $opt_m;
validate_flags();
my $tcp_payload = "ftestertcpprobe$marker";
my $udp_payload = "ftesterudpprobe$marker";
my $icmp_payload = "ftestericmpprobe$marker";
my $seqprobe = "seqprobe$marker";
my $stopsignal = "ftesterstop$marker";
my $ackme = "ackme$marker";
my $finme = "finme$marker";
my $ttl = 200;
my $id = 0;
my $count = 0;
my $null;
my @src_addr;
our($src_addr, $src_port, $dst_addr, $dst_port, $tos);
my @flags_table;
my ($psh, $ack, $rst, $syn, $urg, $fin);
open(OUT, ">>./ftest$marker.log") || die "cannot create log file";
print OUT ("# ftest started on ".`date`);
if ($opt_c) {
my @fields = split (/:/, $opt_c);
die "not enough parameters" unless @fields >= 6;
chomp @fields;
$src_addr = $fields[0]; $src_port = $fields[1];
$dst_addr = $fields[2]; $dst_port = $fields[3];
$tos = $fields[6];
if ($fields[5] =~ 'TCP') {
send_tcp($fields[4], $tcp_payload);
message_tcp($fields[4]) if $verbose;
}
if ($fields[5] =~ 'UDP') {
send_udp($udp_payload);
message_udp() if $verbose;
}
if ($fields[5] =~ 'ICMP') {
send_icmp(
$fields[4], $icmp_payload,
$fields[6], $fields[7]
);
message_icmp($fields[6], $fields[7]) if $verbose;
}
print OUT ("# ftest stopped on ".`date`);
}
for ($count = 0; $count < 64; $count++) {
$flags_table[$count] = "$flags_table[$count]P" if $count & 8;
$flags_table[$count] = "$flags_table[$count]U" if $count & 32;
$flags_table[$count] = "$flags_table[$count]S" if $count & 2;
$flags_table[$count] = "$flags_table[$count]A" if $count & 16;
$flags_table[$count] = "$flags_table[$count]F" if $count & 1;
$flags_table[$count] = "$flags_table[$count]R" if $count & 4;
}
open(CONF, $opt_f) or die "Can't open $opt_f" unless $opt_c;
while (<CONF>) {
if (/^flags:/) {
if (/restore/) {
print("\nRestoring command-line flags => $_\n") if $verbose;
$delay = $opt_d || 0.01;
$sleep = $opt_s || 1;
$fragment = $opt_g || 0;
$segments = $opt_p || 0;
$evasion = $opt_e || 0;
$reset = $opt_r; $finish = $opt_F;
$checksum = $opt_k; $ids_ttl = $opt_t;
} else {
print("\nOverriding command-line flags => $_\n") if $verbose;
$delay = $1 if /-d (\S+)/; $sleep = $1 if /-s (\S+)/;
$fragment = $1 if /-g (\S+)/; $segments = $1 if /-p (\S+)/;
$evasion = $1 if /-e (\S+)/; $checksum = $1 if /-k (\S+)/;
$ids_ttl = $1 if /-t (\S+)/; $reset = 'ok' if /-r/;
$finish = 'ok' if /-F/;
}
validate_flags();
}
next if /^#|^\s|^flags:/;
chomp;
my @fields = split /:/;
die "wrong configuration file syntax!" unless ( @fields >= 6 or $_ =~ /^insert/ );
$psh = 0; $ack = 0; $rst = 0; $syn = 0; $urg = 0; $fin = 0;
$psh = 1 if $fields[4] =~ /P/;
$ack = 1 if $fields[4] =~ /A/;
$rst = 1 if $fields[4] =~ /R/;
$syn = 1 if $fields[4] =~ /S/;
$urg = 1 if $fields[4] =~ /U/;
$fin = 1 if $fields[4] =~ /F/;
if ($_ !~ /^stop_signal|^connect|^ids|^insert/) {
if ($fields[0] =~ /\//) {
parse_cidr($fields[0]);
} else {
parse_range($fields[0]);
}
foreach $src_addr (@src_addr) {
my @src_port_range = split (/-/, $fields[1]);
($src_port_range[1] = $src_port_range[0]) if !($src_port_range[1]);
for $src_port ($src_port_range[0] .. $src_port_range[1]) {
my @dst_port_range = split (/-/, $fields[3]);
($dst_port_range[1] = $dst_port_range[0]) if !($dst_port_range[1]);
for $dst_port ($dst_port_range[0] .. $dst_port_range[1]) {
$dst_addr = $fields[2]; $tos = $fields[6];
if ($fields[5] =~ 'TCP') {
send_tcp($fields[4], $tcp_payload);
message_tcp($fields[4]) if $verbose;
}
if ($fields[5] =~ 'UDP') {
send_udp($udp_payload);
message_udp() if $verbose;
}
if ($fields[5] =~ 'ICMP') {
send_icmp(
$fields[4], $icmp_payload,
$fields[6], $fields[7]
);
message_icmp($fields[6], $fields[7]) if $verbose;
}
}
}
}
}
if ($fields[0] =~ /^connect/) {
die "only TCP can be specified in connection spoofing mode" unless $fields[5] =~ 'TCP';
die "connection spoofing is useless for SYN packets, use normal mode instead" unless $syn =~ 0;
my @connect_fields = split /=|:/;
chomp @connect_fields;
if ($fields[0] =~ /\//) {
parse_cidr($connect_fields[1]);
} else {
parse_range($connect_fields[1]);
}
foreach $src_addr (@src_addr) {
my @src_port_range = split (/-/, $fields[1]);
($src_port_range[1] = $src_port_range[0]) if !($src_port_range[1]);
for $src_port ($src_port_range[0] .. $src_port_range[1]) {
my @dst_port_range = split (/-/, $fields[3]);
($dst_port_range[1] = $dst_port_range[0]) if !($dst_port_range[1]);
for $dst_port ($dst_port_range[0] .. $dst_port_range[1]) {
$dst_addr = $connect_fields[3];
my $rand = int(rand(65535));
my $l = length $tcp_payload;
send_tcp_connect(
"S", $seqprobe,
$rand
);
print("Sent Syn Probe => ",$src_addr,":",$src_port," > ",$dst_addr,":",$dst_port," ","S", " ","TCP","\n") if $verbose;
print("Sleeping for $sleep seconds\n") if $verbose;
sleep($sleep);
send_tcp_connect(
"A", $null,
$rand+8, $rand+1024+1
);
print("Sent Ack Reply => ",$src_addr,":",$src_port," > ",$dst_addr,":",$dst_port," ","A"," ","TCP","\n") if $verbose;
send_tcp(
$connect_fields[5], $tcp_payload,
$rand+8, $rand+1024+1
);
message_tcp($connect_fields[5]) if $verbose;
send_tcp(
$connect_fields[5], $ackme,
$rand+8+$l, $rand+1024+1,
3
);
if ($reset) {
send_rst(
'R', $null,
$rand+8+$l+5, $rand+1024+1
);
}
if ($finish) {
my $l = length $tcp_payload;
my $finme = "finme";
send_fin(
'F', $finme,
$connect_fields[7], $rand+8+$l+5,
$rand+1024+1
);
sleep($sleep);
send_ack(
'A', $null,
$rand+8+$l+5+5, $rand+1024+2
);
}
}
}
}
}
if ( $fields[0] =~ /^stop_signal/ ) {
my @stop_fields = split /=|:/;
chomp @stop_fields;
$src_addr = $stop_fields[1];
$src_port = $stop_fields[2];
$dst_addr = $stop_fields[3];
$dst_port = $stop_fields[4];
$tos = $stop_fields[7];
if ($stop_fields[6] =~ 'TCP') {
print("Stop packet => ",$src_addr,":",$src_port," > ",$dst_addr,":",$dst_port," ",$stop_fields[5]," ","TCP","\n") if $verbose;
send_tcp($stop_fields[5], $stopsignal);
}
if ($stop_fields[6] =~ 'UDP') {
print("Stop packet => ",$src_addr,":",$src_port," > ",$dst_addr,":",$dst_port," ","UDP","\n") if $verbose;
send_udp($stopsignal);
}
if ($stop_fields[6] =~ 'ICMP') {
print("Stop packet => ",$src_addr," > ",$dst_addr," ","ICMP"," ",$stop_fields[7]," ",$stop_fields[8],"\n") if $verbose;
send_icmp(
$stop_fields[5], $stopsignal,
$stop_fields[7], $stop_fields[8]
);
}
}
if ($fields[0] =~ /^ids/) {
my @ids_fields = split (/=|:/, $_, 9);
chomp @ids_fields;
my $rand = int(rand(65535));
my $wrongack = int(rand(65535));
my $l = length $ids_fields[8];
if ($ids_fields[1] =~ /\//) {
parse_cidr($ids_fields[1]);
} else {
parse_range($ids_fields[1]);
}
foreach $src_addr (@src_addr) {
my @src_port_range = split (/-/, $ids_fields[2]);
($src_port_range[1] = $src_port_range[0]) if !($src_port_range[1]);
for $src_port ($src_port_range[0] .. $src_port_range[1]) {
my @dst_port_range = split (/-/, $ids_fields[4]);
($dst_port_range[1] = $dst_port_range[0]) if !($dst_port_range[1]);
for $dst_port ($dst_port_range[0] .. $dst_port_range[1]) {
$dst_addr = $ids_fields[3];
$tos = $ids_fields[7];
if ($evasion =~ 'desync2') {
$checksum = 60000;
send_tcp_connect(
"S", '',
$wrongack, 2
) if ($syn eq 0);
$checksum = $opt_k;
}
if ($ids_fields[6] =~ 'TCP') {
if (($ids_fields[0] =~ /ids-conn/) and ($syn eq 0)) {
send_tcp_connect(
"S", $seqprobe,
$rand
);
print("Sent Syn Probe => ",$src_addr,":",$src_port," > ",$dst_addr,":",$dst_port," ","S"," ","TCP","\n") if $verbose;
print("Sleeping for $sleep seconds\n") if $verbose;
sleep($sleep);
send_tcp_connect(
"A", $null,
$rand+8, $rand+1024+1
);
print("Sent Ack Reply => ",$src_addr,":",$src_port," > ",$dst_addr,":",$dst_port," ","A"," ","TCP","\n") if $verbose;
}
if (!($evasion) or $evasion =~ /frag/) {
send_tcp(
$ids_fields[5], $ids_fields[8],
$rand+8, $rand+1024+1,
1
);
if (($ids_fields[0] =~ /ids-conn/) and ($syn eq 0)) {
send_tcp(
$ids_fields[5], $ackme,
$rand+8+$l, $rand+1024+1,
3
);
if ($reset) {
send_rst(
'R', $null,
$rand+8+$l+5, $rand+1024+1
);
}
if ($finish) {
send_fin(
'F', $finme,
$rand+8+$l+5, $rand+1024+1
);
sleep($sleep);
send_ack(
'A', $null,
$rand+8+$l+5+5, $rand+1024+2
);
}
}
}
if ($evasion and $evasion !~ /frag/) {
my $seg_number = $segments || 2;
my $seq_off;
my $s;
my $stream = $ids_fields[8];
my $stream_length = length $stream;
my $bogus = "dumbIDS";
if ($segments =~ /(\d*)b$/) {
$s = $1;
while ($s > $stream_length) {
$s--;
print("resizing segments size to ",$s," bytes\n") if $verbose;
}
$seg_number = ceil($stream_length/$s);
} else { $s = floor($stream_length/$seg_number); }
while ($seg_number > $stream_length and ($seg_number != 1)) {
$seg_number--;
print("resizing fragments number to ",$seg_number,"\n") if $verbose;
}
for my $i (1 .. ($seg_number - 1)) {
$stream =~ s/(.{$s})(.*)/$2/g;
$seq_off = $seq_off + $s;
if ($i == 1) {
$seq_off = 0;
send_tcp(
$ids_fields[5], $1,
$rand+8, $rand+1024+1,
1
);
}
send_tcp(
$ids_fields[5], $1,
$rand+8+$seq_off, $rand+1024+1,
1
) if ($i != 1);
}
$seq_off = $seq_off + $s;
$seq_off = 0 if ($seg_number == 1);
if ($evasion =~ 'stream1') {
$checksum = 60000;
send_tcp(
$ids_fields[5], $bogus,
$rand+8+$seq_off, $rand+1024+1,
2
);
$checksum = $opt_k;
}
if ($evasion =~ 'ttl1') {
$ttl = $ids_ttl;
send_tcp(
$ids_fields[5], $bogus,
$rand+8+$seq_off, $rand+1024+1,
2
);
$ttl = 200;
}
if ($evasion =~ 'rst1') {
$checksum = 60000;
send_rst(
'R', $bogus,
$rand+8+$seq_off, $rand+1024+1,
2
);
$checksum = $opt_k;
}
if ($evasion =~ 'rst2') {
$ttl = $ids_ttl;
send_rst(
'R', $bogus,
$rand+8+$seq_off, $rand+1024+1,
2
);
$ttl = 200;
}
if ($evasion =~ 'desync1') {
send_tcp_connect(
"S", '',
$wrongack, 2
);
}
send_tcp(
$ids_fields[5], $stream,
$rand+8+$seq_off, $rand+1024+1,
1
);
if (($ids_fields[0] =~ /ids-conn/) and ($syn eq 0)) {
send_tcp(
$ids_fields[5], $ackme,
$rand+8+$l, $rand+1024+1,
3
);
if ($reset) {
send_rst(
'R', $null,
$rand+8+$l+5, $rand+1024+1
);
}
if ($finish) {
send_fin(
'F', $finme,
$rand+8+$l+5, $rand+1024+1
);
sleep($sleep);
send_ack(
'A', $null,
$rand+8+$l+5+5, $rand+1024+2
);
}
}
}
message_tcp_ids($ids_fields[5], $ids_fields[8]) if $verbose;
}
if ($ids_fields[6] =~ 'UDP') {
send_udp($ids_fields[8], 1);
message_udp_ids($ids_fields[8]) if $verbose;
}
if ($ids_fields[6] =~ 'ICMP') {
my @ids_fields = split (/=|:/, $_, 10); # ICMP has 9 fields
send_icmp(
$ids_fields[5], $ids_fields[9],
$ids_fields[7], $ids_fields[8],
1
);
message_icmp_ids($ids_fields[7], $ids_fields[8], $ids_fields[9]) if $verbose;
}
}
}
}
}
if ($fields[0] =~ /^insert/) {
my @insert_fields = split;
my ($protocol, $flag_field, $content, $msg, $dehex, $dsize, $mm, $offset);
my ($itype, $icode);
$src_addr = $insert_fields[2];
$dst_addr = $insert_fields[3];
$tos = $insert_fields[4];
open(SNORT, $insert_fields[1]) or die "Can't open $insert_fields[1]";
while (<SNORT>) {
if (/\S+\s+(\S+)\s+\S+\s(\S+)\s+-\>\s+\S+\s+(\S+)\s+\(([^\)]+)\)/) {
my $rand = int(rand(65535));
my $wrongack = int(rand(65535));
$protocol = $1;
$src_port = $2;
$dst_port = $3;
if ( $src_port =~ /any/ ) {
$src_port = int(rand(65535));
}
if ( $dst_port =~ /any/ ) {
$dst_port = int(rand(65535));
}
$msg = 0; $content = 0;
$flag_field = 0; $dsize = 0;
$offset = 0; $itype = 0;
$icode = 0;
next if (/^#/);
next if (!(/msg:\s*"([^"]+)";/));
$msg = $1;
next if (!(/content:\s*"([^"]+)";/));
$content = $1;
if (/flags:\s*([^;]+);/) { $flag_field = $1; }
if (/dsize:\s*([><]*)([^;]+)/) { $dsize = $2; $mm = $1; }
if (/offset:\s*(\d+)\s*;/) { $offset = $1; }
if (/itype:\s*(\d+);/) { $itype = $1; }
if (/icode:\s*(\d+);/) { $icode = $1; }
my $pad = 'A' x $offset;
$psh = 0; $ack = 0; $rst = 0; $syn = 0; $urg = 0; $fin = 0;
$psh = 1 if $flag_field =~ /P/;
#$psh = 1 if $flag_field =~ /+/; fixme
$ack = 1 if $flag_field =~ /A/;
$rst = 1 if $flag_field =~ /R/;
$syn = 1 if $flag_field =~ /S/;
$urg = 1 if $flag_field =~ /U/;
$fin = 1 if $flag_field =~ /F/;
if ($content =~ /\|([^\|]+)\|/) {
$dehex = $1;
$dehex =~ s/([0-9a-fA-F]{2})/pack('c',hex($1))/eg;
$dehex =~ s/ //g;
$content =~ s/\|[^\|]+\|/$dehex/g;
}
$content = $pad . $content;
if ($dsize) {
my $length = length($content);
my $need = $dsize - $length;
if ( $mm eq ">" ) {
$need++;
}
elsif ( $mm eq "<" ) {
$need--;
}
my $padd = 'A' x $need;
$content = $content . $padd;
}
if ($evasion =~ 'desync2') {
$checksum = 60000;
send_tcp_connect(
"S", '',
$wrongack, 2
) if ($syn eq 0);
$checksum = $opt_k;
}
if ($protocol =~ /tcp|TCP/) {
my $l = length $content;
if (($insert_fields[0] =~ /insert-conn/) and ($syn eq 0)) {
send_tcp_connect(
"S", $seqprobe,
$rand
);
print("Sent Syn Probe => ", $src_addr, ":", $src_port, " > ", $dst_addr, ":", $dst_port, " ", "S", " ", "TCP", "\n") if $verbose;
print("Sleeping for $sleep seconds\n") if $verbose;
sleep($sleep);
send_tcp_connect(
"A", $null,
$rand+8, $rand+1024+1
);
print("Sent Ack Reply => ",$src_addr,":",$src_port," > ",$dst_addr,":",$dst_port," ","A"," ","TCP","\n") if $verbose;
}
if (!($evasion) or $evasion =~ /frag/) {
send_tcp(
$flag_field, $content,
$rand+8, $rand+1024+1,
1
);
send_tcp(
$flag_field, $ackme,
$rand+8+$l, $rand+1024+1,
3
) if ($syn eq 0);
if (($insert_fields[0] =~ /insert-conn/) and ($syn eq 0)) {
if ($reset) {
send_rst(
'R', $null,
$rand+8+$l+5, $rand+1024+1
);
}
if ($finish) {
send_fin(
'F', $finme,
$rand+8+$l+5, $rand+1024+1
);
sleep($sleep);
send_ack(
'A', $null,
$rand+8+$l+5+5, $rand+1024+2
);
}
}
}
if ($evasion and $evasion !~ /frag/) {
my $seg_number = $segments || 2;
my $seq_off;
my $s;
my $stream = $content;
my $stream_length = length $stream;
my $bogus = "dumbIDS";
if ($segments =~ /(\d*)b$/) {
$s = $1;
while ($s > $stream_length) {
$s--;
print("resizing segments size to ",$s," bytes\n") if $verbose;
}
$seg_number = ceil($stream_length/$s);
} else { $s = floor($stream_length/$seg_number); }
while ($seg_number > $stream_length and ($seg_number != 1)) {
$seg_number--;
print("resizing fragments number to ",$seg_number,"\n") if $verbose;
}
for my $i (1 .. ($seg_number - 1)) {
$stream =~ s/(.{$s})(.*)/$2/g;
$seq_off = $seq_off + $s;
if ($i == 1) {
$seq_off = 0;
send_tcp(
$flag_field, $1,
$rand+8, $rand+1024+1,
1
);
}
send_tcp(
$flag_field, $1,
$rand+8+$seq_off, $rand+1024+1,
1
) if ($i != 1);
}
$seq_off = $seq_off + $s;
$seq_off = 0 if ($seg_number == 1);
if ($evasion =~ 'stream1') {
$checksum = 60000;
send_tcp(
$flag_field, $bogus,
$rand+8+$seq_off, $rand+1024+1,
2
);
$checksum = $opt_k;
}
if ($evasion =~ 'ttl1') {
$ttl = $ids_ttl;
send_tcp(
$flag_field, $bogus,
$rand+8+$seq_off, $rand+1024+1,
2
);
$ttl = 200;
}
if ($evasion =~ 'rst1') {
$checksum = 60000;
send_rst(
'R', $bogus,
$rand+8+$seq_off, $rand+1024+1,
2
);
$checksum = $opt_k;
}
if ($evasion =~ 'rst2') {
$ttl = $ids_ttl;
send_rst(
'R', $bogus,
$rand+8+$seq_off, $rand+1024+1,
2
);
$ttl = 200;
}
if ($evasion =~ 'desync1') {
send_tcp_connect(
"S", '',
$wrongack, 2
);
}
send_tcp(
$flag_field, $stream,
$rand+8+$seq_off, $rand+1024+1,
1
);
if (($insert_fields[0] =~ /insert-conn/) and ($syn eq 0)) {
send_tcp(
$flag_field, $ackme,
$rand+8+$l, $rand+1024+1,
3
);
if ($reset) {
send_rst(
'R', $null,
$rand+8+$l+5, $rand+1024+1
);
}
if ($finish) {
send_fin(
'F', $finme,
$rand+8+$l+5, $rand+1024+1
);
sleep($sleep);
send_fin(
'F', $null,
$rand+8+$l+5+5, $rand+1024+2
);
}
}
}
message_tcp_ids($flag_field, $msg) if $verbose;
}
if ($protocol =~ /udp|UDP/) {
send_udp($content, 1) if !($evasion or $evasion =~ /frag/);
message_udp_ids($msg) if $verbose;
}
if ($protocol =~ /icmp|ICMP/) {
send_icmp(
$flag_field, $content,
$itype, $icode,
1
) if !($evasion);
message_icmp_ids($itype, $icode, $msg) if $verbose;
}
}
}
}
}
print OUT ("# ftest stopped on ".`date`);
close(CONF);
sub validate_flags {
die "you cannot use -r and -F flags together! (see man page)" if ($reset & $finish);
die "the -p flag without an evasion option is useless!" if ($segments and !($evasion));
die "you have to specify at least two fragments (-g 2)!" if ($fragment and ($fragment !~ /b/) and $fragment < 2);
die "you cannot specify null fragment size!" if ($fragment and ($fragment eq '0b'));
die "you cannot specify null segment size!" if ($segments and ($segments eq '0b'));
}
sub parse_range {
undef @src_addr;
my @ip_range = split (/\.|-/, $_[0]);
($ip_range[4] = $ip_range[3]) if !($ip_range[4]);
for my $i ($ip_range[3] .. $ip_range[4]) {
my $address = "$ip_range[0].$ip_range[1].$ip_range[2].$i";
push (@src_addr, $address);
}
}
sub parse_cidr {
undef @src_addr;
my @address = split (/\//, $_[0]);
my @ip = split (/\./, $address[0]);
my $mask = $address[1];
my $host_num = 2**(32-$mask);
my $class_num = $host_num/256;
die "CIDR base address didn't start at subnet boundary"
if (($mask < 32) and ($ip[3] != 0) and ((($ip[3]/$class_num)/256) !~ /^\d+$/));
die "CIDR base address didn't start at subnet boundary"
if (($mask < 24) and ($ip[2] != 0) and (($ip[2]/$class_num) !~ /^\d+$/));
die "CIDR base address didn't start at subnet boundary"
if (($mask < 16) and ($ip[1] != 0) and ((($ip[1]*256)/$class_num) !~ /^\d+$/));
die "CIDR base address didn't start at subnet boundary"
if (($mask < 8) and ($ip[0] != 0) and ((($ip[0]*256)/$class_num) !~ /^\d+$/));
for my $i (1 .. $host_num) {
if (($ip[3] != 0) and ($ip[3] != 255)) {
my $address = "$ip[0].$ip[1].$ip[2].$ip[3]";
push (@src_addr, $address);
}
$ip[3]++;
($ip[2] = ($ip[2]+1) and ($ip[3] = 0)) if ($ip[3] == 256);
($ip[1] = ($ip[1]+1) and ($ip[2] = 0)) if ($ip[2] == 256);
($ip[0] = ($ip[0]+1) and ($ip[1] = 0)) if ($ip[1] == 256);
}
}
sub message_tcp {
print($id," - ",$src_addr,":",$src_port," > ",$dst_addr,":",$dst_port," ",$_[0]," ","TCP"," ",$tos,"\n");
}
sub message_udp {
print($id," - ",$src_addr,":",$src_port," > ",$dst_addr,":",$dst_port," ","UDP"," ",$tos,"\n");
}
sub message_icmp {
print($id," - ",$src_addr," > ",$dst_addr," ","ICMP"," ",$_[0]," ",$_[1],"\n");
}
sub message_tcp_ids {
print($id," - ",$src_addr,":",$src_port," > ",$dst_addr,":",$dst_port," ",$_[0]," ","TCP"," ",$tos," \"",$_[1],"\"","\n");
}
sub message_udp_ids {
print($id," - ",$src_addr,":",$src_port," > ",$dst_addr,":",$dst_port," ","UDP"," ",$tos," \"",$_[0],"\"","\n");
}
sub message_icmp_ids {
print($id," - ",$src_addr," > ",$dst_addr," ","ICMP"," ",$_[0]," ",$_[1]," \"",$_[2],"\"","\n");
}
# packet injection subs
#
# send_tcp(
# flags, payload,
# seq number, ack number,
# logging method (null > ftest.log, 1 > ftest.log [IDS mode], 2 > evasion packet, 3 > none)
# );
#
# send_udp(payload, logging method);
#
sub send_tcp {
$id++; if ($id > 65535) { $id = 0 };
$a = new Net::RawIP(
{
ip => {
ttl => $ttl,
id => $id,
saddr => $src_addr,
daddr => $dst_addr,
tos => $tos
},
tcp => {
check => $checksum,
source => $src_port,
dest => $dst_port,
psh => $psh,
ack => $ack,
rst => $rst,
syn => $syn,
urg => $urg,
fin => $fin,
seq => $_[2],
ack_seq => $_[3],
data => $_[1]
}
}
);
$a->send($delay, 1) if (!($fragment) or $_[1] =~ /ackme/ or ((length $_[1]) <= 4));
if ($fragment and $_[1] !~ /ackme/ and ((length $_[1]) > 4)) {
my $frag = $fragment;
my @fragments;
my $offset;
my $b = 8;
my $packet = $a->packet;
$packet = NetPacket::TCP->decode(ip_strip($packet));
my $cksum = $packet->{cksum} if !($checksum);
my $frag1_data = $_[1];
my $frag2_data = $_[1];
$frag1_data =~ s/(.{4}).*/$1/g;
$a = new Net::RawIP(
{
ip => {
frag_off => 0x2000,
protocol => 0x06,
ttl => $ttl,
id => $id,
saddr => $src_addr,
daddr => $dst_addr,
tos => $tos
},
tcp => {
check => $cksum,
source => $src_port,
dest => $dst_port,
psh => $psh,
ack => $ack,
rst => $rst,
syn => $syn,
urg => $urg,
fin => $fin,
seq => $_[2],
ack_seq => $_[3],
data => $frag1_data
}
}