#include <netinet/in.h>#include <netinet/ip.h>#include <netinet/tcp.h>#include <netinet/udp.h>#include <netinet/ip_icmp.h>#include <netinet/if_ether.h>#include <string.h>#include <stdlib.h>#include <stdio.h>#include <signal.h>#include <unistd.h>#include <sys/types.h> #include <sys/socket.h>#include <sys/ioctl.h>#include <linux/sockios.h>#include <linux/if.h>#define MAXBUFFSIZE 65536  #define MAX_URL_LEN 200   #define MAX_SYN 5#define MAX_ECHO 5#define MAX_ECHOREPLY 5#ifndef IP_OFFSET#define IP_OFFSET 0x1FFF#endifFILE *logfd;struct record {long saddr,daddr;unsigned int sport,dport;unsigned int status;unsigned long start_time,last_time;};struct trafflog {unsigned long ippacket;unsigned long fragment;	unsigned long bad_ippacket;	unsigned long tcppacket;unsigned long bad_tcppacket;unsigned long udppacket;unsigned long bad_udppacket;unsigned long icmppacket;unsigned long bad_icmppacket;unsigned long igmppacket;unsigned long unknownpacket;unsigned long totalbytes;};struct sbuff{   union{   struct tcphdr *tcph;   struct udphdr *udph;   struct icmphdr *icmph;   struct igmphdr *igmph;   } h;      union{   struct iphdr *iph;   } nh;      unsigned char *data;} ;struct attack_stats {    unsigned int synflood;    struct sbuff synsbuff;    unsigned int pingflood;    struct sbuff pingsbuff;    unsigned int smurf;    struct sbuff smurfsbuff;};extern void print_iph(const struct iphdr *iph);extern void print_tcph(const struct tcphdr *tcph);extern void print_udph(const struct udphdr *udph);extern void print_icmph(const struct icmphdr *icmph);extern void do_log(char *msg, \                   const struct sbuff *sb);extern void err_quit(char * errbuff);extern void final_quit();extern void process_tcp(const struct sbuff *sbuffptr);extern void process_udp(const struct sbuff *sbuffptr);extern void process_icmp(const struct sbuff *sbuffptr);extern void process_igmp(const struct sbuff *sbuffptr);extern void stats();extern int findport(__u16 port);extern void process_cfg();extern void check_dos_land(const struct sbuff *sbuffptr);extern void check_dos_winnuke(const struct sbuff *sbuffptr);extern void check_probe_cgi(const struct sbuff *sbuffptr);extern void check_scan_tcp(const struct sbuff *sbuffptr);extern void check_dos_longurl(const struct sbuff *sbuffptr);extern void check_dos_pingofdeath(const struct sbuff *sbuffptr);