C语言实现ping

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/ip_icmp.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <sys/time.h>

#define PACKET_SIZE 64  // ICMP报文大小
#define MAX_WAIT_TIME 2 // 最大等待时间（秒）

// 计算校验和
unsigned short calculateChecksum(unsigned short *addr, int len) {
    unsigned int sum = 0;
    while (len > 1) {
        sum += *addr++;
        len -= 2;
    }
    if (len == 1) {
        sum += *(unsigned char *)addr;
    }
    sum = (sum >> 16) + (sum & 0xFFFF);
    sum += (sum >> 16);
    return (unsigned short)(~sum);
}

// 发送ICMP Echo请求
void sendICMPEchoRequest(int sockfd, struct sockaddr_in *dest_addr, int seq) {
    struct icmp send_pkt;
    int pkt_size = sizeof(struct icmp);

    memset(&send_pkt, 0, pkt_size); // 清空结构体