如何在C中使用非连接套接字udp将数据发送到ipv4和ipv6 google界面？

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

int sockfd;
sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
if (sockfd < 0) {
    perror("socket creation failed");
    exit(EXIT_FAILURE);
}

struct sockaddr_in6 server_addr;
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin6_family = AF_INET6;
server_addr.sin6_port = htons(53); // 设置目标端口，这里以DNS服务的默认端口53为例
if (inet_pton(AF_INET6, "2001:4860:4860::8888", &(server_addr.sin6_addr)) <= 0) {
    perror("inet_pton error");
    exit(EXIT_FAILURE);
}

char *message = "Hello, Google!";
int message_len = strlen(message);
if (sendto(sockfd, message, message_len, 0, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
    perror("sendto failed");
    exit(EXIT_FAILURE);
}

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

int main() {
    int sockfd;
    sockfd = socket(AF_INET6, SOCK_DGRAM, 0);
    if (sockfd < 0) {
        perror("socket creation failed");
        exit(EXIT_FAILURE);
    }

    struct sockaddr_in6 server_addr;
    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin6_family = AF_INET6;
    server_addr.sin6_port = htons(53);
    if (inet_pton(AF_INET6, "2001:4860:4860::8888", &(server_addr.sin6_addr)) <= 0) {
        perror("inet_pton error");
        exit(EXIT_FAILURE);
    }

    char *message = "Hello, Google!";
    int message_len = strlen(message);
    if (sendto(sockfd, message, message_len, 0, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("sendto failed");
        exit(EXIT_FAILURE);
    }

    close(sockfd);
    return 0;
}