/* DNS 头定义 */
struct dnshdr
{
unsigned short id;
unsigned short flags;
unsigned short qdcount;
unsigned short ancount;
unsigned short nscount;
unsigned short arcount;
};
#pragma pack(pop)
int t_raw_socket = 0;
int t_scr_ip = 0;
int t_dns_ip = 0;
int t_send_interval = 0;
int count = 0;
/**
校验和函数
*/
unsigned short csum(unsigned short *buf, int nwords)
{
unsigned long sum;
for (sum = 0; nwords > 0; nwords--)
sum += *buf++;
sum = (sum >> 16) + (sum & 0xffff);
sum += (sum >> 16);
return ~sum;
}
/**
* 组装udp包
*/
int build_udp_ip_packet(char *packet, unsigned int payload_size, uint32_t src_ip, uint32_t dst_ip, u_int16_t port)
{
struct ip *ip_hdr = (struct ip *) packet;
struct udphdr *udp_hdr = (struct udphdr *) (packet + sizeof (struct ip));
ip_hdr->ip_hl = 5; //包头长度
ip_hdr->ip_v = 4; //ipv4
ip_hdr->ip_tos = 0; //tos
ip_hdr->ip_len = sizeof(struct ip) + sizeof(struct udphdr) + payload_size; //ip包长度
ip_hdr->ip_id = 0; //id
ip_hdr->ip_off = 0; //fragment offset
ip_hdr->ip_ttl = 255; //ttl
ip_hdr->ip_p = 17; //udp协议
ip_hdr->ip_sum = 0; //临时 checksum
ip_hdr->ip_src.s_addr = src_ip; //原ip
ip_hdr->ip_dst.s_addr = dst_ip; //目的ip
udp_hdr->source = port; //原端口
udp_hdr->dest = htons(53); //目标端口
udp_hdr->len = htons(sizeof(struct udphdr) + payload_size); //udp包长度
udp_hdr->check = 0; //udp校验和
ip_hdr->ip_sum = csum((unsigned short *) packet, ip_hdr->ip_len >> 1); //计算真ip校验和
return ip_hdr->ip_len >> 1;
}
void Sleep(uint32_t msec)
{
struct timespec slptm;
slptm.tv_sec = msec / 1000;
slptm.tv_nsec = 1000 * 1000 * (msec - (msec / 1000) * 1000); //1000 ns = 1 us
if (nanosleep(&slptm, NULL) != -1)
{
}
else
{
fprintf(stderr,"%s : %u", "nanosleep failed !!\n", msec);
}
}
谢谢NEURON提供的代码
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