linux/client.c

// client.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#include <sys/stat.h>
#include <arpa/inet.h>

#define PORT 8001
#define BUFFER_SIZE 1024

void upload_file(int client_socket)
{
    //发送通知服务器是上传文件
    send(client_socket, "upload", strlen("upload"), 0);


    char file_name[BUFFER_SIZE];
    char file_content[BUFFER_SIZE];
    mkdir("./newfile", 0777);
    // 用户输入文件名
    printf("输入要创建的文件名（不带路径,需携带后缀）例如：abc.txt: ");
    scanf("%s", file_name);

    // 提取文件名部分（去掉后缀）
    char base_name[BUFFER_SIZE];
    const char *dot = strrchr(file_name, '.');
    if (dot && dot != file_name)
    {
        strncpy(base_name, file_name, dot - file_name);
        base_name[dot - file_name] = '\0';
    }
    else
    {
        // 如果没有后缀，直接使用原文件名
        strcpy(base_name, file_name);
    }
    printf("文件名部分是: %s\n", base_name);

    // 用户输入文件内容
    printf("输入文件内容（输入完毕后按回车结束）:\n");
    getchar(); // 清除上一次输入的换行符
    fgets(file_content, BUFFER_SIZE, stdin);

    char dir_name[256];
    snprintf(dir_name, 256, "./newfile/%s", file_name);
    printf("文件路径是: %s\n", dir_name);
    
    // 根据dir_name目录，file_name为文件名创建文件并将输入内容写入文件
    FILE *plain_file = fopen(dir_name, "w");
    if (!plain_file)
    {
        perror("文件创建失败");
        return;
    }
    fprintf(plain_file, "%s", file_content);
    fclose(plain_file);
    printf("文件创建成功，准备上传。\n");
    
    // 发送文件名（不含后缀）到服务器
    send(client_socket, base_name, strlen(base_name), 0);
    // 等待服务器确认收到文件名
    char ack[BUFFER_SIZE] = {0};
    read(client_socket, ack, BUFFER_SIZE);
    if (strcmp(ack, "ACK") == 0)
    {
        printf("服务端确认文件名。\n");
    }
    else
    {
        printf("服务端未确认文件名。\n");
        return;
    }
    // 发送文件内容到服务器
    FILE *file = fopen(file_name, "rb");
    if (!file)
    {
        perror("文件打开失败");
        return;
    }
    char buffer[BUFFER_SIZE];
    int bytes_read;
    // 分块读取文件内容并发送到服务端
    while ((bytes_read = fread(buffer, 1, BUFFER_SIZE, file)) > 0)
    {
        if (send(client_socket, buffer, bytes_read, 0) < 0)
        {
            perror("发送文件数据失败");
            fclose(file);
            return;
        }
    }
    fclose(file);
    // 发送文件传输结束标志
    send(client_socket, "EOF", strlen("EOF"), 0);
    printf("文件已上传。\n");
    // 等待服务器发送加密压缩包的路径
    char compressed_path[BUFFER_SIZE] = {0};
    ssize_t bytes_received = read(client_socket, compressed_path, BUFFER_SIZE - 1);
    if (bytes_received > 0) {
        compressed_path[bytes_received] = '\0';  // 确保字符串以空字符结尾
        printf("服务器发送的加密压缩包路径是: %s\n", compressed_path);
    } else {
        perror("读取服务器发送的路径失败");
    }
}

void download_file(int client_socket)
{
    char output_file_name[BUFFER_SIZE];
    char file_path[BUFFER_SIZE];

    printf("输入要下载的文件（加密后的文件压缩包）完整路径: ");
    scanf("%s", file_path);
    
    // 发送下载请求到服务器
    send(client_socket, "download", strlen("download"), 0);
    send(client_socket, file_path, strlen(file_path), 0);
    // 等待服务端准备完成的信号
    char ack[BUFFER_SIZE] = {0};
    int ack_read = read(client_socket, ack, BUFFER_SIZE);
    if (ack_read > 0 && strcmp(ack, "READY") == 0)
    {
        printf("服务端已准备好，开始接收文件...\n");
    }
    else
    {
        printf("服务端未准备好或通信失败。\n");
        close(client_socket);
        return;
    }
    // 创建输出文件
    
    FILE *output = fopen("./output.txt", "wb");
    if (!output)
    {
        perror("文件打开失败");
        return;
    }
    // 接收文件数据
    char buffer[BUFFER_SIZE];
    int bytes_read;
    while ((bytes_read = read(client_socket, buffer, BUFFER_SIZE)) > 0)
    {
        fwrite(buffer, 1, bytes_read, output);
    }
    fclose(output);
    printf("文件已下载，保存在当前目录下的output.txt中。\n");
}

int main()
{
    int client_socket;
    struct sockaddr_in server_addr;

    // 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_addr.s_addr = inet_addr("127.0.0.1"); // 修改为服务器的实际IP地址
    server_addr.sin_port = htons(PORT);

    // 连接服务器
    if (connect(client_socket, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0)
    {
        perror("连接服务器失败");
        close(client_socket);
        return 1;
    }
    else
    {
        // 连接成功后打印确认消息
        printf("连接服务器成功。\n");
    }

    char command[10];
    while (1)
    {
        printf("请输入命令 (upload/download/exit): ");
        scanf("%s", command);

        if (strcmp(command, "upload") == 0)
        {
            upload_file(client_socket);
        }
        else if (strcmp(command, "download") == 0)
        {
            download_file(client_socket);
        }
        else if (strcmp(command, "exit") == 0)
        {
            break;
        }
        else
        {
            printf("未知命令，请重试。\n");
        }
    }

    close(client_socket);
    return 0;
}