docker 中的entrypoint和cmd指令

下面是一个使用C++编写的简单的服务器和客户端程序，服务器通过socket向客户端发送cmd指令，并由客户端执行。

服务器端代码：

cpp复制插入

#include <iostream>
#include <winsock2.h>
#include <string>

#pragma comment(lib, "ws2_32.lib")

int main() {
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cerr << "Failed to initialize winsock" << std::endl;
        return -1;
    }

    // 创建socket
    SOCKET serverSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (serverSocket == INVALID_SOCKET) {
        std::cerr << "Failed to create socket" << std::endl;
        WSACleanup();
        return -1;
    }

    // 绑定IP和端口
    sockaddr_in serverAddr{};
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(8888);
    serverAddr.sin_addr.s_addr = INADDR_ANY;
    if (bind(serverSocket, (struct sockaddr*) &serverAddr, sizeof(serverAddr)) == SOCKET_ERROR) {
        std::cerr << "Failed to bind socket" << std::endl;
        closesocket(serverSocket);
        WSACleanup();
        return -1;
    }

    // 监听连接
    if (listen(serverSocket, 1) == SOCKET_ERROR) {
        std::cerr << "Failed to listen on socket" << std::endl;
        closesocket(serverSocket);
        WSACleanup();
        return -1;
    }

    std::cout << "Waiting for client connection..." << std::endl;

    // 接受连接
    SOCKET clientSocket;
    sockaddr_in clientAddr{};
    int clientAddrSize = sizeof(clientAddr);
    clientSocket = accept(serverSocket, (struct sockaddr*) &clientAddr, &clientAddrSize);
    if (clientSocket == INVALID_SOCKET) {
        std::cerr << "Failed to accept client connection" << std::endl;
        closesocket(serverSocket);
        WSACleanup();
        return -1;
    }

    std::cout << "Client connected" << std::endl;

    // 发送cmd指令给客户端
    std::string cmd;
    while (true) {
        std::cout << "Enter cmd command (or 'exit' to exit): ";
        std::getline(std::cin, cmd);

        // 发送cmd指令
        send(clientSocket, cmd.c_str(), cmd.size(), 0);

        if (cmd == "exit") {
            break;
        }

        // 接收客户端执行结果
        char buffer[4096];
        memset(buffer, 0, sizeof(buffer));
        if (recv(clientSocket, buffer, sizeof(buffer) - 1, 0) == SOCKET_ERROR) {
            std::cerr << "Failed to receive data from client" << std::endl;
            break;
        }

        std::cout << "Received result from client:" << std::endl;
        std::cout << buffer << std::endl;
    }

    // 关闭连接
    closesocket(clientSocket);
    closesocket(serverSocket);
    WSACleanup();

    std::cout << "Server terminated" << std::endl;

    return 0;
}

复制插入

客户端代码：

cpp复制插入

#include <iostream>
#include <winsock2.h>

#pragma comment(lib, "ws2_32.lib")

int main() {
    WSADATA wsaData;
    if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
        std::cerr << "Failed to initialize winsock" << std::endl;
        return -1;
    }

    // 创建socket
    SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (clientSocket == INVALID_SOCKET) {
        std::cerr << "Failed to create socket" << std::endl;
        WSACleanup();
        return -1;
    }

    // 连接到服务器
    sockaddr_in serverAddr{};
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(8888);
    serverAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
    if (connect(clientSocket, (struct sockaddr*) &serverAddr, sizeof(serverAddr)) == SOCKET_ERROR) {
        std::cerr << "Failed to connect to server" << std::endl;
        closesocket(clientSocket);
        WSACleanup();
        return -1;
    }

    // 接收并执行服务器发来的cmd指令
    while (true) {
        char buffer[4096];
        memset(buffer, 0, sizeof(buffer));
        if (recv(clientSocket, buffer, sizeof(buffer) - 1, 0) == SOCKET_ERROR) {
            std::cerr << "Failed to receive cmd command from server" << std::endl;
            break;
        }

        std::string cmd(buffer);

        if (cmd == "exit") {
            break;
        }

        std::cout << "Received cmd command from server: " << cmd << std::endl;

        // 执行cmd指令
        FILE* pipe = _popen(cmd.c_str(), "r");
        if (!pipe) {
            std::cerr << "Failed to execute cmd command" << std::endl;
            break;
        }

        std::cout << "Executing cmd command..." << std::endl;

        std::string result;
        char buffer2[128];
        while (!feof(pipe)) {
            if (fgets(buffer2, 128, pipe) != nullptr)
                result += buffer2;
        }

        _pclose(pipe);

        // 将执行结果发送给服务器
        send(clientSocket, result.c_str(), result.size(), 0);
    }

    // 关闭连接
    closesocket(clientSocket);
    WSACleanup();

    std::cout << "Client terminated" << std::endl;

    return 0;
}

复制插入

请注意，这只是一个简单的示例程序，没有处理错误和异常情况。在实际使用中，应该进行错误处理、合理的输入验证和安全措施。

制作不易,请点赞加关注