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DNS FLood Detector 1.2
Dennis Opacki
dopacki@adotout.com
What is DNS Flood Detector?
DNS Flood Detector was developed to detect abusive usage levels on high
traffic nameservers and to enable quick response to the use of one's
nameserver to facilitate spam. DNS Flood Detector is distributed under the
Gnu Public License (see included LICENSE file for details).
How does it work?
DNS Flood Detector uses libpcap (in non-promiscuous mode) to monitor
incoming dns queries to a nameserver. The tool may be run in one of two
modes, either daemon mode or "bindsnap" mode. In daemon mode, the tool
will alarm via syslog. In bindsnap mode, the user is able to get
near-real-time stats on usage to aid in more detailed troubleshooting.
By default, it will count dns queries directed to any address in the same
network as the primary IP address on the interface being watched; the -A,
-M, and -Q options can be used to modify this behaviour.
As of version 1.2, DNS Flood Detector can now send source IP request
data to a network-based collector as JSON. This lets you gather near
real-time information about who is using your DNS servers, and from
where. I've included a sample application called dns_flood_collector.pl,
which you can use to receive and report these data. The output of this
program can be easily fed into a graphing tool, such as Caida's
plot-latlong:
http://www.caida.org/tools/visualization/plot-latlong/
How do I build it?
Execute ./configure.pl to select the appropriate make target. Then simply
type "make".
Why was it written?
I wrote DNS Flood Detector because the fifty or so public recursive
nameservers I am responsible for were being abused by both customers and
non-customers. DNS Flood Detector allows for prompt action when anomalous
conditions are detected.
What do I need to use it?
You need libpcap and a little bit of patience.
What platforms does it work on?
Linux, BSDI, FreeBSD, Mac OSX, Solaris
Will it run under Windows {95,98,NT,2000,XP,2003,2008 or Win7}?
Maybe. I haven't tried. If it doesn't, feel free to submit a fix.
What does it look like?
Usage: ./dns_flood_detector [OPTION]
-i IFNAME specify interface to listen on
-t N alarm at >N queries per second
-a N reset alarm after N seconds
-w N calculate stats every N seconds
-x N create N buckets
-m N mark total query rate every N seconds
-A addr filter for specific address
-M mask netmask for filter (in conjunction with -A)
-Q don't filter by local interface address
-b run in foreground in bindsnap mode
-d run in background in daemon mode
-D dump dns packets (implies -b)
-v verbose output - use again for more verbosity
-s send source IP stats to collector as JSON
-z N.N.N.N address to send stats to (default 226.1.1.2)
-p N UDP port to send stats to (default 2000)
-h display this usage information
Sample Output:
dopacki:~$ sudo ./dns_flood_detector -v -v -b -t10
[15:14:56] source [192.168.1.45] - 0 qps tcp : 24 qps udp [8 qps A] [16 qps PTR]
[15:14:56] source [10.0.24.2] - 0 qps tcp : 15 qps udp [15 qps A]
[15:15:06] source [192.168.1.45] - 0 qps tcp : 24 qps udp [8 qps A] [16 qps PTR]
[15:15:06] source [10.0.24.2] - 0 qps tcp : 15 qps udp [14 qps A]
[15:15:16] source [192.168.1.45] - 0 qps tcp : 23 qps udp [7 qps A] [15 qps PTR]
What if I have questions?
You can e-mail me at dopacki@adotout.com

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#!/usr/bin/perl
use strict;
my $os = shift;
# get target listings
opendir(MAKE_TARGETS,'./makefiles');
my @targets = grep { /Makefile/ && -f './makefiles/'.$_ && s/^Makefile-// } readdir(MAKE_TARGETS);
closedir(MAKE_TARGETS);
# display usage
unless ($os && grep{/$os/}@targets) {print<<EOF;exit(0)}
usage: $0 {@targets}
EOF
# link appropriate target
symlink './makefiles/Makefile-'.$os, 'Makefile';
print "type make.\n";

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#!/usr/bin/perl
use strict;
use threads;
use threads::shared;
use Sys::Syslog;
use Data::Dumper;
use Getopt::Long;
use POSIX;
use IO::Socket::Multicast;
use JSON;
# Native Maxmind library - http://www.maxmind.com/download/geoip/api/perl/
# requires: http://www.maxmind.com/app/c
use Geo::IP;
# set these to the same port and multicast (or unicast) address as the detector
use constant GROUP => '226.1.1.2';
use constant PORT => '2000';
my %ipc_source :shared;
my %ipc_customer :shared;
my $time_to_die :shared = 0;
my $debug;
my $foreground=0;
# determines how often you want to aggregage and write-out stats dumps
my $interval = 60;
# you can get the binary format GeoLiteCity.dat from Maxmind
# http://www.maxmind.com/app/geolitecity
my $gi = Geo::IP->open("/usr/local/GeoLiteCity.dat",GEOIP_MEMORY_CACHE | GEOIP_CHECK_CACHE);
# adjust this to the path where you want to keep the
sub PATH {'/tmp/'}
$|=1;
GetOptions(
"debug" => \$debug,
"foreground" => \$foreground,
"interval=s" => \$interval,
);
main();
exit();
sub main() {
# daemonize unless running in foreground
unless ($foreground){
daemonize();
}
# prepare data acquisition thread
threads->new(\&get_data);
while (! $time_to_die ) {
# record time started to help evenly space runs
my $start_run = time();
my $next_run = $start_run + $interval;
# de-serialize latest copy of source address structure
# execute this in a isolated scope so that lock goes out of scope
{
my $source_distance;
# lock data structure to prevent other thread from updating it
lock(%ipc_source);
# open coordinates file for graph generation
open(CRDS, ">".PATH."/coords.txt.tmp");
# calculate great circle distance between each source IP and local POP
foreach my $key (keys %ipc_source) {
eval {
my $r = $gi->record_by_addr($key);
# write raw entry to coordinates file
print CRDS $key.",".$ipc_source{$key}.",".$r->latitude.",".$r->longitude."\n";
};
if ($@) {
print CRDS $key.",".$ipc_source{$key}.",0,0\n";
}
}
# close coordinate file
close CRDS;
system("mv ".PATH."/coords.txt.tmp ".PATH."/coords.txt");
# clean out structure for next sample period
%ipc_source = ();
}
# sleep to make the interval
while((my $time_left = ($next_run - time())) > 0) {
sleep($time_left);
}
}
threads->join();
return;
}
# fetch data from UDP multicast
sub get_data() {
# set up our multicast listener
# note: this will receive unicast fine too
my $sock = IO::Socket::Multicast->new(LocalPort=>PORT,ReuseAddr=>1);
$sock->mcast_add(GROUP) || die "Couldn't set group: $!\n";
while ( ! $time_to_die ) {
my $data;
next unless $sock->recv($data,1500);
# decode JSON
eval {
my $obj = decode_json $data;
print Dumper $obj;
foreach my $ip (keys %{$obj->{data}}) {
my $count = $obj->{data}->{$ip};
lock(%ipc_source);
$ipc_source{$ip}+=$count;
}
};
}
# done!
threads->exit();
}
# daemonize application
sub daemonize {
chdir '/' or die "Can't chdir to /: $!";
open STDIN, '/dev/null' or die "Can't read /dev/null: $!";
open STDOUT, '>/dev/null';
# fork and exit parent
my $pid = fork();
exit if $pid;
die "Couldn't fork: $!" unless defined ($pid);
POSIX::setsid() || die ("$0 can't start a new session: $!");
open STDERR, '>&STDOUT' or die "Can't dup stdout: $!";
# signal handlers
$SIG{KILL} = \&handler;
}
sub handler {
$time_to_die = 1;
}

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/******************************************************************************
Program: dns_flood_detector.h
Author: Dennis Opacki <dopacki@adotout.com>
Date: Tue Mar 18 16:46:53 EST 2003
Purpose: Monitor DNS servers for abusive usage levels
and alarm to syslog
Copyright (C) 2003 Dennis Opacki
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; either version 2 of the License, or
(at your option) any later version.
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*******************************************************************************/
// definitions
#ifndef ETHER_HDRLEN
#define ETHER_HDRLEN 14
#endif
#define NS_MAXDNAME 1025
#define MAXSYSLOG 192
#define MAXMESSAGE 1200
#define MAXDATALET 64
#define MAXHEAD 300
#define MAX_TIME_LEN 20
#define DEFAULT_PORT 2000
#define DEFAULT_IP "226.1.1.2"
#define HOST_NAME_MAX 254
// evil Solaris hack
#ifdef __sun__
typedef uint8_t u_int8_t;
typedef uint16_t u_int16_t;
typedef uint32_t u_int32_t;
#endif
// prototypes
void handle_IP(u_char *args,const struct pcap_pkthdr* pkthdr,const u_char* packet);
int calculate_averages();
int saddr_stats(int sock, struct sockaddr_in addr, char *hostname);
int scour_bucket(int i);
int find_bucket(struct in_addr *ip_src);
int daemonize(void);
int malloc_fail(char * var, int size);
int microsleep(unsigned int usec);
// data structures
struct my_dns {
u_int16_t dns_id; /* query identification number */
u_int8_t dns_flags1; /* first byte of flags */
u_int8_t dns_flags2; /* second byte of flags */
u_int16_t dns_qdcount; /* number of question entries */
u_int16_t dns_ancount; /* number of answer entries */
u_int16_t dns_nscount; /* number of authority entries */
u_int16_t dns_arcount; /* number of resource entries */
};
struct bucket {
struct in_addr ip_addr;
unsigned int tcp_count;
unsigned int udp_count;
unsigned int qps;
int qstats[256];
time_t first_packet;
time_t last_packet;
time_t alarm_set;
};

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#! /bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
test -f /usr/local/sbin/dns_flood_detector || exit 0
case "$1" in
start)
echo -n "Starting DNS flood detector: dns_flood_detector"
start-stop-daemon --start --quiet --exec /usr/local/sbin/dns_flood_detector -- -d
echo "."
;;
stop)
echo -n "Stopping DNS flood detector: dns_flood_detector"
start-stop-daemon --stop --quiet --exec /usr/local/sbin/dns_flood_detector
killall dns_flood_detector
echo "."
;;
restart|force-reload)
echo -n "Restarting DNS flood detector: dns_flood_detector... "
start-stop-daemon --stop --quiet --exec /usr/local/sbin/dns_flood_detector
sleep 2
start-stop-daemon --stop --quiet --exec /usr/local/sbin/dns_flood_detector
sleep 4
killall dns_flood_detector
sleep 2
start-stop-daemon --start --quiet --exec /usr/local/sbin/dns_flood_detector -- -d
echo "done."
;;
*)
echo "Usage: /etc/init.d/dnsflood {start|stop|restart|force-reload}"
exit 1
;;
esac
exit 0

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CFLAGS+=-O -g
LDLIBS=-lpcap -pthread -lm
all: dns_flood_detector
strip dns_flood_detector
clean:
rm -rf dns_flood_detector *.o *~
install:
cp dns_flood_detector /usr/local/sbin/
distclean: clean
rm Makefile
dns_flood_detector: dns_flood_detector.c

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CFLAGS+=-O -g
LDLIBS=-lpcap -pthread -lm
all: dns_flood_detector
strip dns_flood_detector
clean:
rm -rf dns_flood_detector *.o *~
install:
cp dns_flood_detector /usr/local/sbin/
distclean: clean
rm Makefile
dns_flood_detector: dns_flood_detector.c

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CFLAGS=-Wall -O -D_BSD_SOURCE -g
LDLIBS=-lpcap -lpthread -lm
all: dns_flood_detector
strip dns_flood_detector
clean:
rm -rf dns_flood_detector *.o *~
install:
cp dns_flood_detector /usr/local/sbin/
distclean: clean
rm Makefile
dns_flood_detector: dns_flood_detector.c

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CFLAGS+=-Wall -O -g -I/usr/local/include -I/usr/include
LDLIBS=-lpcap -lpthread -lm
all: dns_flood_detector
strip dns_flood_detector
clean:
rm -rf dns_flood_detector *.o *~
install:
cp dns_flood_detector /usr/local/sbin/
distclean: clean
rm Makefile
dns_flood_detector: dns_flood_detector.c

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CFLAGS+=-O -g -I/usr/local/include -I/usr/include
LDLIBS=-L/usr/local/lib -L/usr/lib -lpcap -lpthread -lm -lsocket -lnsl
all: dns_flood_detector
strip dns_flood_detector
clean:
rm -rf dns_flood_detector *.o *~
install:
cp dns_flood_detector /usr/local/sbin/
distclean: clean
rm Makefile
dns_flood_detector: dns_flood_detector.c