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【Linux】Windows 客户端访问 Linux 服务器

article 2025/3/20 10:56:44

Windows 客户端访问 Linux 服务器

  • 一.UDP通信
    • 1.UdpServer.cc
    • 2.UdpClient.cc
  • 二.TCP通信
    • 1.TcpServer.cc
    • 2.TcpClient.cc

一.UDP通信

.PHONY:all
all:tcp_server udp_server

tcp_server:TcpServer.cc
	g++ -o $@ $^ -std=c++14
udp_server:UdpServer.cc
	g++ -o $@ $^ -std=c++14

.PHONY:clean
clean:
	rm -rf tcp_server udp_server

1.UdpServer.cc

#include <iostream>
#include <string>
#include <memory>
#include <cerrno>
#include <cstring>
#include <unistd.h>
#include <strings.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

const static uint16_t defaultport = 8888;
const static int defaultfd = -1;
const static int defaultsize = 1024;

enum
{
    Usage_Err = 1,
    Socket_Err,
    Bind_Err
};

class UdpServer
{
public:
    UdpServer(uint16_t port = defaultport)
        : _port(port), _sockfd(defaultfd)
    {
    }
    void Init()
    {
        // 1. 创建socket，就是创建了文件细节
        _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
        if (_sockfd < 0)
        {
            exit(Socket_Err);
        }

        // 2. 绑定，指定网络信息
        struct sockaddr_in local;
        bzero(&local, sizeof(local)); // memset
        local.sin_family = AF_INET;
        local.sin_port = htons(_port);
        local.sin_addr.s_addr = INADDR_ANY; // 1. 4字节IP 2. 变成网络序列

        // 结构体填完，设置到内核中了吗？？没有
        int n = ::bind(_sockfd, (struct sockaddr *)&local, sizeof(local));
        if (n != 0)
        {
            exit(Bind_Err);
        }
    }
    void Start()
    {
        // 服务器永远不退出
        char buffer[defaultsize];
        for (;;)
        {
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer); // 不能乱写
            ssize_t n = recvfrom(_sockfd, buffer, sizeof(buffer) - 1, 0, (struct sockaddr *)&peer, &len);
            if (n > 0)
            {
                uint16_t clientport = ntohs(peer.sin_port);
                std::string clientip = inet_ntoa(peer.sin_addr);
                std::string prefix = clientip + ":" + std::to_string(clientport);
                buffer[n] = 0;
                std::cout << prefix << "# " << buffer << std::endl;


                std::string echo = buffer;
                echo += "[udp server echo message]";
                sendto(_sockfd, echo.c_str(), echo.size(), 0, (struct sockaddr *)&peer, len);
            }
        }
    }
    ~UdpServer()
    {
    }

private:
    uint16_t _port;
    int _sockfd;
};

void Usage(std::string proc)
{
    std::cout << "Usage : \n\t" << proc << " local_port\n"
              << std::endl;
}

// ./udp_server 8888
int main(int argc, char *argv[])
{
    if (argc != 2)
    {
        Usage(argv[0]);
        return Usage_Err;
    }

    uint16_t port = std::stoi(argv[1]);
    std::unique_ptr<UdpServer> usvr = std::make_unique<UdpServer>(port);
    usvr->Init();
    usvr->Start();

    return 0;
}

2.UdpClient.cc

#include <iostream>
#include <string>
#include <WinSock2.h>
#include <Windows.h>

#pragma warning(disable : 4996)

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

std::string serverip = "123.60.170.90";  // 填写你的云服务器ip
uint16_t serverport = 8080;              // 填写你的云服务开放的端口号

int main()
{
    WSADATA wsd;
    WSAStartup(MAKEWORD(2, 2), &wsd);

    struct sockaddr_in server;
    memset(&server, 0, sizeof(server));
    server.sin_family = AF_INET;
    server.sin_port = htons(serverport); //?
    server.sin_addr.s_addr = inet_addr(serverip.c_str());

    SOCKET sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd == SOCKET_ERROR)
    {
        std::cout << "socker error" << std::endl;
        return 1;
    }
    std::string message;
    char buffer[1024];
    while (true)
    {
        std::cout << "Please Enter@ ";
        std::getline(std::cin, message);
        if(message.empty()) continue;
        sendto(sockfd, message.c_str(), (int)message.size(), 0, (struct sockaddr *)&server, sizeof(server));
        struct sockaddr_in temp;
        int len = sizeof(temp);
        int s = recvfrom(sockfd, buffer, 1023, 0, (struct sockaddr *)&temp, &len);
        if (s > 0)
        {
            buffer[s] = 0;
            std::cout << buffer << std::endl;
        }
    }
    closesocket(sockfd);
    WSACleanup();
    
    return 0;
}

二.TCP通信

1.TcpServer.cc

#include <iostream>
#include <string>
#include <cerrno>
#include <cstring>
#include <cstdlib>
#include <memory>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <unistd.h>

const static int default_backlog = 6;

enum
{
    Usage_Err = 1,
    Socket_Err,
    Bind_Err,
    Listen_Err
};

#define CONV(addr_ptr) ((struct sockaddr *)addr_ptr)

class TcpServer
{
public:
    TcpServer(uint16_t port) : _port(port), _isrunning(false)
    {}
    
	~TcpServer()
    {}
    
    // 都是固定套路
    void Init()
    {
        // 1. 创建socket, file fd, 本质是文件
        _listensock = socket(AF_INET, SOCK_STREAM, 0);
        if (_listensock < 0)
        {
            exit(0);
        }
        int opt = 1;
        setsockopt(_listensock, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt));

        // 2. 填充本地网络信息并bind
        struct sockaddr_in local;
        memset(&local, 0, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(_port);
        local.sin_addr.s_addr = htonl(INADDR_ANY);

        // 2.1 bind
        if (bind(_listensock, CONV(&local), sizeof(local)) != 0)
        {
            exit(Bind_Err);
        }

        // 3. 设置socket为监听状态，tcp特有的
        if (listen(_listensock, default_backlog) != 0)
        {
            exit(Listen_Err);
        }
    }
    
    void ProcessConnection(int sockfd, struct sockaddr_in &peer)
    {
        uint16_t clientport = ntohs(peer.sin_port);
        std::string clientip = inet_ntoa(peer.sin_addr);
        std::string prefix = clientip + ":" + std::to_string(clientport);
        std::cout << "get a new connection, info is : " << prefix << std::endl;
        while (true)
        {
            char inbuffer[1024];
            ssize_t s = ::read(sockfd, inbuffer, sizeof(inbuffer)-1);
            if(s > 0)
            {
                inbuffer[s] = 0;
                std::cout << prefix << "# " << inbuffer << std::endl;
                std::string echo = inbuffer;
                echo += "[tcp server echo message]";
                write(sockfd, echo.c_str(), echo.size());
            }
            else
            {
                std::cout << prefix << " client quit" << std::endl;
                break;
            }
        }
    }
    
    void Start()
    {
        _isrunning = true;
        while (_isrunning)
        {
            // 4. 获取连接
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            int sockfd = accept(_listensock, CONV(&peer), &len);
            if (sockfd < 0)
            {
                continue;
            }
            ProcessConnection(sockfd, peer);
        }
    }
private:
    uint16_t _port;
    int _listensock; // TODO
    bool _isrunning;
};

using namespace std;

void Usage(std::string proc)
{
    std::cout << "Usage : \n\t" << proc << " local_port\n"
              << std::endl;
}

// ./tcp_server 8888
int main(int argc, char *argv[])
{
    if (argc != 2)
    {
        Usage(argv[0]);
        return Usage_Err;
    }
    uint16_t port = stoi(argv[1]);
    std::unique_ptr<TcpServer> tsvr = make_unique<TcpServer>(port);
    tsvr->Init();
    tsvr->Start();

    return 0;
}

2.TcpClient.cc

#define _CRT_SECURE_NO_WARNINGS 1

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

#pragma warning(disable : 4996)

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

std::string serverip = "123.60.170.90";  // 填写你的云服务器ip
uint16_t serverport = 8080;              // 填写你的云服务开放的端口号

int main()
{
    WSADATA wsaData;
    int result = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (result != 0)
    {
        std::cerr << "WSAStartup failed: " << result << std::endl;
        return 1;
    }

    SOCKET clientSocket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (clientSocket == INVALID_SOCKET)
    {
        std::cerr << "socket failed" << std::endl;
        WSACleanup();
        return 1;
    }

    sockaddr_in serverAddr;
    serverAddr.sin_family = AF_INET;
    serverAddr.sin_port = htons(serverport);                  // 替换为服务器端口
    serverAddr.sin_addr.s_addr = inet_addr(serverip.c_str()); // 替换为服务器IP地址

    result = connect(clientSocket, (SOCKADDR*)&serverAddr, sizeof(serverAddr));
    if (result == SOCKET_ERROR)
    {
        std::cerr << "connect failed" << std::endl;
        closesocket(clientSocket);
        WSACleanup();
        return 1;
    }
    
    while (true)
    {
        std::string message;
        std::cout << "Please Enter@ ";
        std::getline(std::cin, message);
        if (message.empty()) continue;
        send(clientSocket, message.c_str(), message.size(), 0);

        char buffer[1024] = { 0 };
        int bytesReceived = recv(clientSocket, buffer, sizeof(buffer) - 1, 0);
        if (bytesReceived > 0)
        {
            buffer[bytesReceived] = '\0'; // 确保字符串以 null 结尾
            std::cout << "Received from server: " << buffer << std::endl;
        }
        else
        {
            std::cerr << "recv failed" << std::endl;
        }
    }
    closesocket(clientSocket);
    WSACleanup();

    return 0;
}

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