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拒绝服务入侵机制及处理办法(一)

[10-05 23:40:36]   来源:http://www.5ijcw.com  网络知识   阅读:8437

概要:char*regex,*filter; structbpf_programpcapfilter; structin_addrnet,mask; char*dev=NULL; intlink_offset; pcap_t*pd; /TFN2Kdetection**/ unsignedintudp_flood_count=0,syn_flood_count=0; unsignedinttarga_flood_count=0,icmp_flood_count=0; unsignedlongmy_dns,targ1,targ2,rfp1,icmp_flood=1; time_tt; unsignedl
拒绝服务入侵机制及处理办法(一),标签:电脑网络知识,网络基础知识,http://www.5ijcw.com
  char *regex, *filter;
  struct bpf_program pcapfilter;
  struct in_addr net, mask;
  char *dev = NULL;
  int link_offset;
  pcap_t *pd;
  
  /**************** TFN2K detection **********************************/
  
  unsigned int udp_flood_count=0, syn_flood_count=0;
  
  unsigned int targa_flood_count=0, icmp_flood_count=0;
  unsigned long my_dns, targ1, targ2, rfp1, icmp_flood=1;
  time_t t;
  
  unsigned long dns_circbuff[DNS_REQUEST_MAX];
  unsigned int dns_cb_ptr=0;
  unsigned long icmp_circbuff[ICMP_REQUEST_MAX];
  unsigned int icmp_cb_ptr=0;
  
  void add_dns (unsigned long ipadd){
  dns_circbuff[dns_cb_ptr++]=ipadd;
  if (dns_cb_ptr==DNS_REQUEST_MAX) dns_cb_ptr=0;}
  
  void add_icmp (unsigned long ipadd){
  icmp_circbuff[icmp_cb_ptr++]=ipadd;
  if (icmp_cb_ptr==ICMP_REQUEST_MAX) dns_cb_ptr=0;}
  
  void anti_tfn_init (void) {
  unsigned int x;
  for(x=0;xfor(x=0;xmy_dns=inet_addr(DNS_SERVER_IP);
  printf("Ngrep with TFN detection modifications by wiretrip / www.wiretrip.netn");
  printf("Watching DNS server: %sn",inet_ntoa(my_dns));
  targ1=htons(16383); targ2=htons(8192);
  rfp1=htons(~(ICMP_ECHO << 8)); /* hopefull this is universal ;) */
  alarm(20);}
  
  void print_circbuffs (void) {
  unsigned int x;
  printf("Last (%u) DNS requests:n",DNS_REQUEST_MAX);
  for(x=0;xif(dns_circbuff[x]>0) printf("%sn",inet_ntoa(dns_circbuff[x]));
  printf("nLast (%u) ICMP echo requests (pings):n",ICMP_REQUEST_MAX);
  for(x=0;xif (icmp_circbuff[x]>0) printf("%sn",inet_ntoa(icmp_circbuff[x]));}
  
  void reset_counters (int sig) {
  udp_flood_count=syn_flood_count=targa_flood_count=icmp_flood_count=0;
  alarm(10);}
  
  void tfn_attack_detected (char* attack_type){
  if(icmp_flood==0) return;
  (void)time(&t);
  printf("n%s",ctime(&t));
  printf("A TFN2K %s attack has been detected!nn",attack_type);
  print_circbuffs();
  printf("nIncoming realtime ICMP echo requests (pings):n");
  icmp_flood=0;}
  
  /*********************************************************************/
  
  int main(int argc, char **argv) {
  cha www.5ijcw.com r c;
  signal(SIGINT,dealloc);
  signal(SIGQUIT,dealloc);
  signal(SIGABRT,dealloc);
  signal(SIGPIPE,dealloc);
  signal(SIGALRM,reset_counters);
  
  anti_tfn_init();
  
  while ((c = getopt(argc, argv, "d:")) != EOF) {
  switch (c) {
  case d: 
  dev = optarg;
  break;}}
  
  if (!dev) 
  if (!(dev = pcap_lookupdev(pc_err))) {
  perror(pc_err);
  exit(-1);}
  
  if ((pd = pcap_open_live(dev, snaplen, promisc, to, pc_err)) == NULL) {
  perror(pc_err);
  exit(-1);}
  
  if (pcap_lookupnet(dev,&net.s_addr,&mask.s_addr, pc_err) == -1) {
  perror(pc_err);
  exit(-1);} 
  
  printf("interface: %s (%s/", dev, inet_ntoa(net));

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