#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define PORT 8001
#define BUFFER_SIZE 1024

int main() {
    int client_socket;
    struct sockaddr_in server_addr;
    char buffer[BUFFER_SIZE];

    // 创建客户端 socket
    client_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (client_socket == -1) {
        perror("客户端 socket 创建失败");
        exit(EXIT_FAILURE);
    }

    // 设置服务器地址
    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(PORT);
    server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");

    // 连接到服务器
    if (connect(client_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) == -1) {
        perror("连接服务器失败");
        close(client_socket);
        exit(EXIT_FAILURE);
    }

    printf("连接服务器成功！\n");

    while (1) {
        printf("输入要发送的消息: ");
        fgets(buffer, BUFFER_SIZE, stdin);
        buffer[strcspn(buffer, "\n")] = 0; // 去掉换行符

        send(client_socket, buffer, strlen(buffer), 0);

        if (strcmp(buffer, "exit") == 0) {
            break;
        }

        int bytes_read = recv(client_socket, buffer, sizeof(buffer) - 1, 0);
        if (bytes_read > 0) {
            buffer[bytes_read] = '\0';
            printf("服务器回复: %s\n", buffer);
        }
    }

    close(client_socket);
    return 0;
}