使用 PuTTY 连接到 winsock 服务器时出现错误 "Invalid padding length on received packet"

Question

我主要是网络新手，所以我想我应该从一些简单的东西开始，所以我试图制作一个简单的 C++ 回显服务器。我正在使用 PuTTY 进行测试。当我通过 PuTTY 连接到服务器时，出现

的 PuTTY 错误

Invalid padding length received packet

当我检查服务器控制台时，它说 PuTTY 客户端已连接但立即断开连接。这是我的代码。

#include <stdlib.h>
#include <WS2tcpip.h> //includes the winsock file as well
#include <string>
#pragma comment (lib,"ws2_32.lib")
#define PORT 17027
int main()
{

    //Initialize winsock
    WSADATA wsData;
    WORD ver = MAKEWORD(2, 2);

    int wsOK = WSAStartup(ver, &wsData);
    if (wsOK != 0)
    {
        std::cout << "Can't initialize wonsock! Quitting" << std::endl;
        return 0;
    }

    //Create a socket
    SOCKET listenSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (listenSocket == INVALID_SOCKET)
    {
        std::cout << "Can't create socket! Quitting" << std::endl;
        return 0;
    }

    //Bind the socket to an ip address and port
    sockaddr_in hint;
    hint.sin_family = AF_INET;
    hint.sin_port = htons(PORT);
    hint.sin_addr.S_un.S_addr = INADDR_ANY;

    bind(listenSocket, (sockaddr *)&hint, sizeof(hint));

    //Tell Winsock the socket is for listening
    listen(listenSocket, SOMAXCONN);

    //Wait for connection
    sockaddr_in client;
    int clientSize = sizeof(client);


    SOCKET clientSocket = accept(listenSocket, (sockaddr*)&client, &clientSize);
    if (clientSocket == INVALID_SOCKET)
    {
        std::cout << "Cant accept client! Quitting" << std::endl;
        return 0;
    }

    char host[NI_MAXHOST]; // Client's remote name;
    char service[NI_MAXHOST]; // Client's (i.e. port) the client is connected on

    ZeroMemory(host, NI_MAXHOST);
    ZeroMemory(service, NI_MAXHOST);

    if (getnameinfo((sockaddr*)&client, sizeof(client), host, NI_MAXHOST, service, NI_MAXHOST, 0) == 0) // try to get name of client
    {
        std::cout << host << " connected on port " << service << std::endl;
    }
    else 
    {
        inet_ntop(AF_INET, &client.sin_addr, host, NI_MAXHOST); //get address of client
        std::cout << host << " connected on port " << ntohs(client.sin_port) << std::endl;
    }

    //Close listening socket
    closesocket(listenSocket);

    //While loop: accept and echo message back to client
    char buf[4096];
    while (true)
    {
        ZeroMemory(buf, 4096);
        //Wait for client to send data
        int bytesReceived = recv(clientSocket, buf, 4096, 0);
        if (bytesReceived == SOCKET_ERROR)
        {
            std::cerr << "Error in recv(). Quitting" << std::endl;
            break;
        }

        if (bytesReceived == 0)
        {
            std::cerr << "Client disconnected" << std::endl;
            break;
        }

        //Echo message back to client
        send(clientSocket, buf, bytesReceived + 1, 0);
    }

    //Close the socket
    closesocket(clientSocket);

    //Cleanup winsock
    WSACleanup();

    return 0;
}

Answer 1

您似乎正在尝试使用 SSH 连接。您的代码不是 SSH 服务器。

要使用 PuTTY 连接到原始套接字服务器，您需要select“原始”连接类型。

使用 PuTTY 连接到 winsock 服务器时出现错误 "Invalid padding length on received packet"

Error "Invalid padding length on received packet" when connecting to winsock server using PuTTY

c++

winsock

putty

winsock2