bzero连接域名

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <unistd.h>

int main(int argc, char *argv[]) {
    if (argc != 3) {
        fprintf(stderr, "Usage: %s hostname port\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    const char *hostname = argv[1];
    const char *port = argv[2];

    struct addrinfo hints, *res, *p;
    int sockfd;

    memset(&hints, 0, sizeof hints);
    hints.ai_family = AF_UNSPEC; // 使用 IPv4 或 IPv6
    hints.ai_socktype = SOCK_STREAM; // TCP 流套接字

    int status = getaddrinfo(hostname, port, &hints, &res);
    if (status != 0) {
        fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(status));
        exit(EXIT_FAILURE);
    }

    for (p = res; p != NULL; p = p->ai_next) {
        sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
        if (sockfd == -1) {
            perror("socket");
            continue;
        }

        if (connect(sockfd, p->ai_addr, p->ai_addrlen) == -1) {
            perror("connect");
            close(sockfd);
        } else {
            break; // 成功连接
        }
    }

    if (p == NULL) {
        fprintf(stderr, "Failed to connect\n");
        exit(EXIT_FAILURE);
    }

    printf("Connected to %s\n", hostname);

    freeaddrinfo(res); // 释放 getaddrinfo 返回的结构体

    close(sockfd); // 关闭套接字

    return 0;
}