我听说可以通过创建一个UDP socket并将我的（）连接到有效的目标IP地址（例如Google）来获得自己的IP地址（不是127.0.0.1）。

但是，我找不到任何参考或示例。

这可能吗？如果是这样，我该怎么做？

char* get_my_ip() {
    int sockfd;
    struct sockaddr_storage remoteaddr; // client address
    socklen_t addrlen;
    char remoteIP[INET6_ADDRSTRLEN];
    char *ip_addr;
    ip_addr = malloc(sizeof(char) * INET6_ADDRSTRLEN);
    int rv;

    struct addrinfo hints, *ai, *p;

    memset(&hints, 0, sizeof hints);
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_DGRAM;
    if ((rv = getaddrinfo("8.8.8.8", "http", &hints, &ai)) != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
        exit(1);
    }
    // loop through all the results and make a socket
    for(p = ai; p != NULL; p = p->ai_next) {
        if ((sockfd = socket(p->ai_family, p->ai_socktype,
            p->ai_protocol)) == -1) {
            perror("UDP: socket");
            continue;
        }

        if (connect(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
            close(sockfd);
            perror("UDP: connect");
            continue;
        }
        break;
    }
    if (p == NULL) {
        fprintf(stderr, "UDP: failed to bind socket\n");
        exit(2);
    }

    getsockname(sockfd, (struct sockaddr*)&remoteaddr, &addrlen);

    // deal with both IPv4 and IPv6:
    if (remoteaddr.ss_family == AF_INET) {
        struct sockaddr_in *s = (struct sockaddr_in *)&remoteaddr;
        inet_ntop(AF_INET, &s->sin_addr, remoteIP, addrlen);
    }
    else { // AF_INET6
        struct sockaddr_in6 *s = (struct sockaddr_in6 *)&remoteaddr;
        inet_ntop(AF_INET6, &s->sin6_addr, remoteIP, addrlen);
    }
    printf("IP_ADDRESS:%s", remoteIP);

    freeaddrinfo(ai); // all done with this structure
    close(sockfd);

    strcpy(ip_addr, remoteIP);
    return ip_addr;
}