如何用C语言编写一个网络连通性测试简单脚本输出测试后文档

在C语言中编写一个网络连通性测试脚本，可以使用socket编程的基本原理检测到目标主机是否可达。以下是一个简单的示例，测试完后你可以生成一个文档记录结果：

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

int is_connected(char* host, int port) {
    int sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock == -1) {
        fprintf(stderr, "Error creating socket: %s\n", strerror(errno));
        return 1;
    }

    struct sockaddr_in server_address;
    bzero(&server_address, sizeof(server_address));
    server_address.sin_family = AF_INET;
    server_address.sin_port = htons(port);
    inet_aton(host, &server_address.sin_addr);

    int result = connect(sock, (struct sockaddr*)&server_address, sizeof(server_address));
    close(sock);

    if (result == 0) {
        printf("%s:%d is connected.\n", host, port);
        return 0; // 连接成功
    } else {
        fprintf(stderr, "Failed to connect to %s:%d: %s\n", host, port, strerror(errno));
        return 1; // 连接失败
    }
}

// 测试函数
void test_network_connection(const char* hosts[], int num_hosts) {
    for (int i = 0; i < num_hosts; ++i) {
        int status = is_connected(hosts[i], 80); // 假设HTTP默认端口
        if (status == 1) {
            fprintf(stderr, "Could not connect to %s.\n", hosts[i]);
        }
    }
}

int main() {
    const char* hosts[] = {"www.google.com", "www.baidu.com", "localhost"};
    int num_hosts = sizeof(hosts) / sizeof(hosts[0]);
    test_network_connection(hosts, num_hosts);

    return 0;
}