如何解决通过网络将文件复制到域外的目标
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);
}
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