80 lines
2.6 KiB
C
80 lines
2.6 KiB
C
/******************************************************************************
|
|
|
|
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;
|
|
};
|
|
|