问如何从TCP连接中获得正确的MAC地址？

EN

int __cdecl main(int argc, char **argv) 
{
    WSADATA wsaData;
    SOCKET ConnectSocket = INVALID_SOCKET;
    struct addrinfo *result = NULL,
        *ptr = NULL,
        hints;
    int iResult;

    // Validate the parameters
    if (argc != 3) {
        printf("usage: %s server-name port\n", argv[0]);
        return 1;
    }

    // Initialize Winsock
    iResult = WSAStartup(MAKEWORD(2,2), &wsaData);
    if (iResult != 0) {
        printf("WSAStartup failed with error: %d\n", iResult);
        return 1;
    }

    ZeroMemory( &hints, sizeof(hints) );
    hints.ai_family = AF_UNSPEC;
    hints.ai_socktype = SOCK_STREAM;
    hints.ai_protocol = IPPROTO_TCP;

    // Resolve the server address and port
    iResult = getaddrinfo(argv[1], argv[2], &hints, &result);
    if ( iResult != 0 ) {
        printf("getaddrinfo failed with error: %d\n", iResult);
        WSACleanup();
        return 1;
    }

    // Attempt to connect to an address until one succeeds
    for(ptr=result; ptr != NULL ;ptr=ptr->ai_next) {
        static size_t attempt = 0;
        std::cout << "attempt: " << attempt++ << std::endl;

        // Create a SOCKET for connecting to server
        ConnectSocket = socket(ptr->ai_family, ptr->ai_socktype, 
            ptr->ai_protocol);
        if (ConnectSocket == INVALID_SOCKET) {
            printf("socket failed with error: %ld\n", WSAGetLastError());
            WSACleanup();
            return 1;
        }

        // Connect to server.
        iResult = connect( ConnectSocket, ptr->ai_addr, (int)ptr->ai_addrlen);
        if (iResult == SOCKET_ERROR) {
            closesocket(ConnectSocket);
            ConnectSocket = INVALID_SOCKET;
            continue;
        }
        break;
    }

    freeaddrinfo(result);

    if (ConnectSocket == INVALID_SOCKET) {
        printf("Unable to connect to server!\n");
        WSACleanup();
        return 1;
    }

    {
        char ip_address_info [128] = "";
        SOCKADDR_IN host = {0};
        int host_size = sizeof (SOCKADDR_IN);  
        int res;

        res = getsockname(ConnectSocket, (SOCKADDR*) &host, &host_size);    
        if (res == 0) {
            sprintf (ip_address_info, "%s:%d", inet_ntoa (host.sin_addr), htons (host.sin_port));
            std::cout << "ip_address_info: " << ip_address_info << std::endl;
        }
        else {
            std::cout << "res == 0 after getsockname" << std::endl;
        }

        host_size = sizeof (SOCKADDR_IN);  
        res = getpeername (ConnectSocket, (SOCKADDR*) &host, &host_size);    
        if (res == 0) {
            sprintf (ip_address_info, "%s:%d", inet_ntoa (host.sin_addr), htons (host.sin_port));   
            std::cout << "ip_address_info: " << ip_address_info << std::endl;
        }
        else {
            std::cout << "res == 0 after getpeername" << std::endl;
        }
    }

    // shutdown the connection since no more data will be sent
    iResult = shutdown(ConnectSocket, SD_SEND);
    if (iResult == SOCKET_ERROR) {
        printf("shutdown failed with error: %d\n", WSAGetLastError());
        closesocket(ConnectSocket);
        WSACleanup();
        return 1;
    }
    std::cout << "shutdown run" << std::endl;

    // cleanup
    closesocket(ConnectSocket);
    WSACleanup();

    return 0;
}