通过网络将文件复制到域外的目标

问题描述

我想使用c＃通过网络将文件从计算机A（帐户为myAccount @ mydomain）复制到计算机B（用户B @ computerB）。 我尝试过标准

File.Copy(source,destination)

并尝试从计算机A启动cmd进程并调用复制方法

System.Diagnostics.Process process = new System.Diagnostics.Process();
System.Diagnostics.ProcessStartInfo startInfo = new System.Diagnostics.ProcessStartInfo();
startInfo.UseShellExecute = false;
startInfo.Domain = "computerB"; //ofcourse it wont work since its outside the local domain of A
startInfo.FileName = "cmd.exe";
startInfo.Arguments = @"/C COPY \\computerA\Path\File1.txt \\computerB\Path$ ";
process.StartInfo = startInfo;
process.Start();
process.WaitForExit();
//It will exit the user name or password is incorrect

我也尝试使用PSexec来模拟computerB：

 System.Diagnostics.Process process = new System.Diagnostics.Process();
 System.Diagnostics.ProcessStartInfo startInfo = new 
 System.Diagnostics.ProcessStartInfo();
 startInfo.UseShellExecute = false;
 startInfo.FileName = "cmd.exe";
 startInfo.Arguments = @"psexec \\computerB -u computerB\userB -p userBPassword cmd /c COPY \\computerA\Path\File1.txt \\computerB\Path$";
 process.StartInfo = startInfo;
 process.Start();
 process.WaitForExit();
//it will exit that the source file is unknown

总而言之，计算机A能够看到源（自身），但是看不到目的地（因为计算机B仅具有授权的本地用户）。 计算机B能够看到目的地（本身）但看不到源（因为计算机A在其域之外并且没有通过网络共享）。

是否有解决此问题的方法？

解决方法

这听起来像是一个相当简单的身份验证问题，只要当前用户在域中和域外都没有共享权限，就会弹出这种身份验证问题。在系统用户下运行并尝试访问其他设备上的共享时，也会出现此问题。

解决方案是使用WNetUseConnection API打开到目标设备的身份验证连接，执行文件操作，然后通过调用WNetCancelConnection2来关闭连接。

这是我过去为此使用的一些代码：

class ConnectSMB : IDisposable
{
    public string URI { get; private set; }
    public bool Connected { get; private set; } = false;

    public ConnectSMB(string uri,string username,string encPassword)
    {
        string pass = StringEncryption.Decode(encPassword);
        string connResult = Native.ConnectToRemote(uri,username,pass);
        if (connResult != null)
            throw new Exception(connResult);
            
        URI = uri;
        Connected = true;
    }

    public void Dispose()
    {
        Close();
    }

    public void Close()
    {
        if (Connected)
        {
            Native.DisconnectRemote(URI);
            URI = null;
            Connected = false;
        }
    }
}

public class Native
{
    #region Consts
    const int RESOURCETYPE_DISK = 1;
    const int CONNECT_UPDATE_PROFILE = 0x00000001;
    #endregion

    #region Errors
    public enum ENetUseError
    {
        NoError = 0,AccessDenied = 5,AlreadyAssigned = 85,BadDevice = 1200,BadNetName = 67,BadProvider = 1204,Cancelled = 1223,ExtendedError = 1208,InvalidAddress = 487,InvalidParameter = 87,InvalidPassword = 1216,MoreData = 234,NoMoreItems = 259,NoNetOrBadPath = 1203,NoNetwork = 1222,BadProfile = 1206,CannotOpenProfile = 1205,DeviceInUse = 2404,NotConnected = 2250,OpenFiles = 2401
    }
    #endregion

    #region API methods
    [DllImport("Mpr.dll")]
    private static extern ENetUseError WNetUseConnection(
        IntPtr hwndOwner,NETRESOURCE lpNetResource,string lpPassword,string lpUserID,int dwFlags,string lpAccessName,string lpBufferSize,string lpResult
    );

    [DllImport("Mpr.dll")]
    private static extern ENetUseError WNetCancelConnection2(
        string lpName,bool fForce
    );

    [StructLayout(LayoutKind.Sequential)]
    private class NETRESOURCE
    {
        // Not used
        public int dwScope = 0;
        // Resource Type - disk or printer
        public int dwType = RESOURCETYPE_DISK;
        // Not used
        public int dwDisplayType = 0;
        // Not used
        public int dwUsage = 0;
        // Local Name - name of local device (optional,not used here)
        public string lpLocalName = "";
        // Remote Name - full path to remote share
        public string lpRemoteName = "";
        // Not used
        public string lpComment = "";
        // Not used
        public string lpProvider = "";
    }
    #endregion

    public static string ConnectToRemote(string remoteUNC,string password)
    {
        NETRESOURCE nr = new NETRESOURCE
        {
            lpRemoteName = remoteUNC
        };

        ENetUseError ret = WNetUseConnection(IntPtr.Zero,nr,password,null,null);
        if (ret == ENetUseError.NoError) return null;
        return ret.ToString();
    }

    public static string DisconnectRemote(string remoteUNC)
    {
        ENetUseError ret = WNetCancelConnection2(remoteUNC,CONNECT_UPDATE_PROFILE,false);
        if (ret == ENetUseError.NoError) return null;
        return ret.ToString();
    }
}

在执行远程文件操作之前，创建ConnectSMB类的实例，然后在完成连接后处置（或关闭）该类。

using (var smb = new ConnectSMB(@"\\computerB\Path","userB","userBPassword"))
{
    File.Copy(source,destination);
}