如何使用原始套接字在C中接收ICMP请求

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>

#define BUF_SIZE 1500

int main() {
    int raw_sock;
    struct sockaddr_in my_addr;
    char buffer[BUF_SIZE];
    struct ip *ip_header;
    struct icmp *icmp_header;
    int header_len;

    // 创建原始套接字
    if ((raw_sock = socket(AF_INET, SOCK_RAW, IPPROTO_ICMP)) < 0) {
        perror("socket");
        exit(1);
    }

    memset(&my_addr, 0, sizeof(my_addr));
    my_addr.sin_family = AF_INET;
    my_addr.sin_port = htons(0);
    my_addr.sin_addr.s_addr = htonl(INADDR_ANY);

    while (1) {
        int n = recvfrom(raw_sock, buffer, BUF_SIZE, 0, NULL, NULL);
        if (n < 0) {
            perror("recvfrom");
            continue;
        }

        ip_header = (struct ip *)buffer;
        header_len = ip_header->ip_hl << 2;
        icmp_header = (struct icmp *)(buffer + header_len);

        if (icmp_header->icmp_type == ICMP_ECHO) {
            printf("Received ICMP Echo Request\n");
            // 处理ICMP Echo Request
        }
    }

    close(raw_sock);
    return 0;
}