如何从 C# 中的 FTP 请求中获取 IP 地址

Question

I have an incoming FTP request. I would like to get the IP Address of the FTP server mentioned in the incoming FTP request. I have to validate this against a list of whitelisted FTP servers.

Any help will be well appreciated..

My code is as follows:

try
{
    IPHostEntry host;
    string localIP = "?";
    host = Dns.GetHostEntry(uri);
    foreach (IPAddress ip in host.AddressList)
    {
        // we are only interested in IPV4 Addresses
        if (ip.AddressFamily == AddressFamily.InterNetwork) 
        {
            localIP = ip.ToString();
        }
    }

    return localIP;
}
catch (Exception exception)
{
    throw;
}

Answer 1

Ok here is my hack..

private string GetFTPAddress(string uri)
{
    try
    {
       // IPHostEntry host;
        string localIP = null;
        var entries = uri.Split('/');
        var host = Dns.GetHostAddresses(entries[2]);
        foreach (IPAddress ip in host)
        {
            // we are only interested in IPV4 Addresses
            if (ip.AddressFamily == AddressFamily.InterNetwork)
            {
                localIP = ip.ToString();
            }
        }

        return localIP;
    }
    catch (Exception exception)
    {
        throw;
    }
}