Come chiudere una connessione TCP per porta?

Question

Vorrei chiudere una connessione esistente tra un'applicazione in esecuzione sul mio server. Se hai un suggerimento, ti preghiamo di rispondere su come programmarlo, sarai apprezzato.

Nota: l'applicazione TCPView può chiudere la connessione esattamente come è necessario, ma vorrei eseguirla come un'applicazione console o altra riga di comando.

Answer 1

Finalmente ho trovato la soluzione per la mia richiesta. Il credito va a CSharpFriends.com, ora migrato a debugging.com.

le seguenti finestre API deve essere utilizzato:

//API to get list of connections 
[DllImport("iphlpapi.dll")] 
private static extern int GetTcpTable(IntPtr pTcpTable, ref int pdwSize, bool bOrder); 

//API to change status of connection 
[DllImport("iphlpapi.dll")] 
private static extern int SetTcpEntry(IntPtr pTcprow); 

//Convert 16-bit value from network to host byte order 
[DllImport("wsock32.dll")] 
private static extern int ntohs(int netshort); 

//Convert 16-bit value back again 
[DllImport("wsock32.dll")] 
private static extern int htons(int netshort); 

 

using System; 
using System.Collections.Generic; 
using System.Text; 
using System.Collections; 
using System.Runtime.InteropServices; 


namespace ConnectionManager 
{ 
    class Disconnector 
    { 
    } 

    public class Starter 
    { 
     public static void Main(string[] args) 
     { 
      if (args.Length == 0) 
      { 
       Console.WriteLine("Disconnect IP1 [IP2 [IP3 [IPn]]]"); 
       Console.WriteLine(""); 
       Console.WriteLine("Connections up now:"); 
       string[] cons = Disconnecter.Connections(Disconnecter.State.Established); 
       foreach (string s in cons) 
       { 
        Console.WriteLine(s); 
       } 
      } 
      else 
      { 
       foreach (string s in args) 
       { 
        Disconnecter.CloseLocalIP(s); 
        Disconnecter.CloseRemoteIP(s); 
       } 
      } 
     } 
    } 

    public class Disconnecter 
    { 

     /// <summary> 
     /// Enumeration of the states 
     /// </summary> 
     public enum State 
     { 
      /// <summary> All </summary> 
      All = 0, 
      /// <summary> Closed </summary> 
      Closed = 1, 
      /// <summary> Listen </summary> 
      Listen = 2, 
      /// <summary> Syn_Sent </summary> 
      Syn_Sent = 3, 
      /// <summary> Syn_Rcvd </summary> 
      Syn_Rcvd = 4, 
      /// <summary> Established </summary> 
      Established = 5, 
      /// <summary> Fin_Wait1 </summary> 
      Fin_Wait1 = 6, 
      /// <summary> Fin_Wait2 </summary> 
      Fin_Wait2 = 7, 
      /// <summary> Close_Wait </summary> 
      Close_Wait = 8, 
      /// <summary> Closing </summary> 
      Closing = 9, 
      /// <summary> Last_Ack </summary> 
      Last_Ack = 10, 
      /// <summary> Time_Wait </summary> 
      Time_Wait = 11, 
      /// <summary> Delete_TCB </summary> 
      Delete_TCB = 12 
     } 

     /// <summary> 
     /// Connection info 
     /// </summary> 
     private struct MIB_TCPROW 
     { 
      public int dwState; 
      public int dwLocalAddr; 
      public int dwLocalPort; 
      public int dwRemoteAddr; 
      public int dwRemotePort; 
     } 

     //API to get list of connections 
     [DllImport("iphlpapi.dll")] 
     private static extern int GetTcpTable(IntPtr pTcpTable, ref int pdwSize, bool bOrder); 

     //API to change status of connection 
     [DllImport("iphlpapi.dll")] 
     //private static extern int SetTcpEntry(MIB_TCPROW tcprow); 
     private static extern int SetTcpEntry(IntPtr pTcprow); 

     //Convert 16-bit value from network to host byte order 
     [DllImport("wsock32.dll")] 
     private static extern int ntohs(int netshort); 

     //Convert 16-bit value back again 
     [DllImport("wsock32.dll")] 
     private static extern int htons(int netshort); 

     /// <summary> 
     /// Testexample 
     /// </summary> 
     public static void TEST() 
     { 
      Console.WriteLine("Not Working Yet!!!"); 
      //string[] ret = Connections(State.All); 
      //foreach (string con in ret) if (con.IndexOf("192.168.0.101") > -1) System.Diagnostics.Debug.WriteLine(con); 
      //System.Diagnostics.Debug.WriteLine("----------------------------"); 
      //CloseRemotePort(1863); 
      //CloseRemotePort(80); 
      //ret = Connections(State.All); 
      //foreach (string con in ret) if (con.IndexOf("192.168.0.101") > -1) System.Diagnostics.Debug.WriteLine(con); 
     } 

     /// <summary> 
     /// Close all connection to the remote IP 
     /// </summary> 
     /// <param name="IP">IPen på remote PC</param> 
     public static void CloseRemoteIP(string IP) 
     { 
      MIB_TCPROW[] rows = getTcpTable(); 
      for (int i = 0; i < rows.Length; i++) 
      { 
       if (rows[i].dwRemoteAddr == IPStringToInt(IP)) 
       { 
        rows[i].dwState = (int)State.Delete_TCB; 
        IntPtr ptr = GetPtrToNewObject(rows[i]); 
        int ret = SetTcpEntry(ptr); 
       } 
      } 
     } 

     /// <summary> 
     /// Close all connections at current local IP 
     /// </summary> 
     /// <param name="IP"></param> 
     public static void CloseLocalIP(string IP) 
     { 
      MIB_TCPROW[] rows = getTcpTable(); 
      for (int i = 0; i < rows.Length; i++) 
      { 
       if (rows[i].dwLocalAddr == IPStringToInt(IP)) 
       { 
        rows[i].dwState = (int)State.Delete_TCB; 
        IntPtr ptr = GetPtrToNewObject(rows[i]); 
        int ret = SetTcpEntry(ptr); 
       } 
      } 
     } 

     /// <summary> 
     /// Closes all connections to the remote port 
     /// </summary> 
     /// <param name="port"></param> 
     public static void CloseRemotePort(int port) 
     { 
      MIB_TCPROW[] rows = getTcpTable(); 
      for (int i = 0; i < rows.Length; i++) 
      { 
       if (port == ntohs(rows[i].dwRemotePort)) 
       { 
        rows[i].dwState = (int)State.Delete_TCB; 
        IntPtr ptr = GetPtrToNewObject(rows[i]); 
        int ret = SetTcpEntry(ptr); 
       } 
      } 
     } 

     /// <summary> 
     /// Closes all connections to the local port 
     /// </summary> 
     /// <param name="port"></param> 
     public static void CloseLocalPort(int port) 
     { 
      MIB_TCPROW[] rows = getTcpTable(); 
      for (int i = 0; i < rows.Length; i++) 
      { 
       if (port == ntohs(rows[i].dwLocalPort)) 
       { 
        rows[i].dwState = (int)State.Delete_TCB; 
        IntPtr ptr = GetPtrToNewObject(rows[i]); 
        int ret = SetTcpEntry(ptr); 
       } 
      } 
     } 

     /// <summary> 
     /// Close a connection by returning the connectionstring 
     /// </summary> 
     /// <param name="connectionstring"></param> 
     public static void CloseConnection(string connectionstring) 
     { 
      try 
      { 
       //Split the string to its subparts 
       string[] parts = connectionstring.Split('-'); 
       if (parts.Length != 4) throw new Exception("Invalid connectionstring - use the one provided by Connections."); 
       string[] loc = parts[0].Split(':'); 
       string[] rem = parts[1].Split(':'); 
       string[] locaddr = loc[0].Split('.'); 
       string[] remaddr = rem[0].Split('.'); 

       //Fill structure with data 
       MIB_TCPROW row = new MIB_TCPROW(); 
       row.dwState = 12; 
       byte[] bLocAddr = new byte[] { byte.Parse(locaddr[0]), byte.Parse(locaddr[1]), byte.Parse(locaddr[2]), byte.Parse(locaddr[3]) }; 
       byte[] bRemAddr = new byte[] { byte.Parse(remaddr[0]), byte.Parse(remaddr[1]), byte.Parse(remaddr[2]), byte.Parse(remaddr[3]) }; 
       row.dwLocalAddr = BitConverter.ToInt32(bLocAddr, 0); 
       row.dwRemoteAddr = BitConverter.ToInt32(bRemAddr, 0); 
       row.dwLocalPort = htons(int.Parse(loc[1])); 
       row.dwRemotePort = htons(int.Parse(rem[1])); 

       //Make copy of the structure into memory and use the pointer to call SetTcpEntry 
       IntPtr ptr = GetPtrToNewObject(row); 
       int ret = SetTcpEntry(ptr); 

       if (ret == -1) throw new Exception("Unsuccessful"); 
       if (ret == 65) throw new Exception("User has no sufficient privilege to execute this API successfully"); 
       if (ret == 87) throw new Exception("Specified port is not in state to be closed down"); 
       if (ret != 0) throw new Exception("Unknown error (" + ret + ")"); 

      } 
      catch (Exception ex) 
      { 
       throw new Exception("CloseConnection failed (" + connectionstring + ")! [" + ex.GetType().ToString() + "," + ex.Message + "]"); 
      } 
     } 

     /// <summary> 
     /// Gets all connections 
     /// </summary> 
     /// <returns></returns> 
     public static string[] Connections() 
     { 
      return Connections(State.All); 
     } 

     /// <summary> 
     /// Gets a connection list of connections with a defined state 
     /// </summary> 
     /// <param name="state"></param> 
     /// <returns></returns> 
     public static string[] Connections(State state) 
     { 
      MIB_TCPROW[] rows = getTcpTable(); 

      ArrayList arr = new ArrayList(); 

      foreach (MIB_TCPROW row in rows) 
      { 
       if (state == State.All || state == (State)row.dwState) 
       { 
        string localaddress = IPIntToString(row.dwLocalAddr) + ":" + ntohs(row.dwLocalPort); 
        string remoteaddress = IPIntToString(row.dwRemoteAddr) + ":" + ntohs(row.dwRemotePort); 
        arr.Add(localaddress + "-" + remoteaddress + "-" + ((State)row.dwState).ToString() + "-" + row.dwState); 
       } 
      } 

      return (string[])arr.ToArray(typeof(System.String)); 
     } 

     //The function that fills the MIB_TCPROW array with connectioninfos 
     private static MIB_TCPROW[] getTcpTable() 
     { 
      IntPtr buffer = IntPtr.Zero; bool allocated = false; 
      try 
      { 
       int iBytes = 0; 
       GetTcpTable(IntPtr.Zero, ref iBytes, false); //Getting size of return data 
       buffer = Marshal.AllocCoTaskMem(iBytes); //allocating the datasize 

       allocated = true; 

       GetTcpTable(buffer, ref iBytes, false); //Run it again to fill the memory with the data 

       int structCount = Marshal.ReadInt32(buffer); // Get the number of structures 

       IntPtr buffSubPointer = buffer; //Making a pointer that will point into the buffer 
       buffSubPointer = (IntPtr)((int)buffer + 4); //Move to the first data (ignoring dwNumEntries from the original MIB_TCPTABLE struct) 

       MIB_TCPROW[] tcpRows = new MIB_TCPROW[structCount]; //Declaring the array 

       //Get the struct size 
       MIB_TCPROW tmp = new MIB_TCPROW(); 
       int sizeOfTCPROW = Marshal.SizeOf(tmp); 

       //Fill the array 1 by 1 
       for (int i = 0; i < structCount; i++) 
       { 
        tcpRows[i] = (MIB_TCPROW)Marshal.PtrToStructure(buffSubPointer, typeof(MIB_TCPROW)); //copy struct data 
        buffSubPointer = (IntPtr)((int)buffSubPointer + sizeOfTCPROW); //move to next structdata 
       } 

       return tcpRows; 

      } 
      catch (Exception ex) 
      { 
       throw new Exception("getTcpTable failed! [" + ex.GetType().ToString() + "," + ex.Message + "]"); 
      } 
      finally 
      { 
       if (allocated) Marshal.FreeCoTaskMem(buffer); //Free the allocated memory 
      } 
     } 

     private static IntPtr GetPtrToNewObject(object obj) 
     { 
      IntPtr ptr = Marshal.AllocCoTaskMem(Marshal.SizeOf(obj)); 
      Marshal.StructureToPtr(obj, ptr, false); 
      return ptr; 
     } 

     //Convert an IP string to the INT value 
     private static int IPStringToInt(string IP) 
     { 
      if (IP.IndexOf(".") < 0) throw new Exception("Invalid IP address"); 
      string[] addr = IP.Split('.'); 
      if (addr.Length != 4) throw new Exception("Invalid IP address"); 
      byte[] bytes = new byte[] { byte.Parse(addr[0]), byte.Parse(addr[1]), byte.Parse(addr[2]), byte.Parse(addr[3]) }; 
      return BitConverter.ToInt32(bytes, 0); 
     } 
     //Convert an IP integer to IP string 
     private static string IPIntToString(int IP) 
     { 
      byte[] addr = System.BitConverter.GetBytes(IP); 
      return addr[0] + "." + addr[1] + "." + addr[2] + "." + addr[3]; 
     } 

    } 
} 

Answer 2

close(fd); /* comment to reach minimum size for an answer */