断开已经建立的TCP连接
如何断开指定进程的网络连接,已经建立的
如何断开指定进程的网络连接,已经建立的
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Option Explicit
Private Type MIB_TCPROW ' TCP连接表中一行的结构
dwState As Long ' 状态
dwLocalAddr As Long ' Local IP
dwLocalPort As Long ' Local port
dwRemoteAddr As Long ' Remote IP
dwRemotePort As Long ' Remote port
End Type
Private Type MIB_TCPTABLE
dwNum_Of_Entries As Long ' 当前 TCP连接的总数
TCP_Table(120) As MIB_TCPROW ' 预留了120行的缓冲区
End Type
Private Declare Function GetTcpTable Lib "iphlpapi.dll" (ByRef pTcpTable _
As MIB_TCPTABLE, ByRef pdwSize As Long, ByVal bOrder As Long) As Long
Private Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (ByRef _
pDest As Any, ByRef pSource As Any, ByVal Length As Long)
Private Declare Function sndPlaySound Lib "winmm.dll" Alias "sndPlaySoundA" _
(ByVal lpszSoundName As String, ByVal uFlags As Long) As Long
Private Declare Function GetWindowsDirectory Lib "kernel32" Alias _
"GetWindowsDirectoryA" (ByVal lpBuffer As String, ByVal nSize As Long) As Long
Private Declare Function SetTcpEntry Lib "iphlpapi.dll" (ByRef pTcpTable _
As MIB_TCPROW) As Long
Dim Last_Num_Of_Entries As Long
Dim TCP1 As MIB_TCPTABLE
Private Sub Form_Load()
Timer1.Interval = 10000 ' 定时监控
Timer1_Timer
End Sub
Private Sub Timer1_Timer()
Dim Return1 As Long, i As Long, Tmp1 As Long, Tmp2 As Long
Dim Ip_Buf(1 To 4) As Byte
Dim Win_Path As String, Tmp3 As String
Return1 = GetTcpTable(TCP1, Len(TCP1), 1) ' 返回 TCP连接表
If Last_Num_Of_Entries <> 0 And _
Last_Num_Of_Entries <> TCP1.dwNum_Of_Entries Then ' 有异常时发出警告
Picture1.Visible = True ' 设置警告标志
On Error Resume Next
Win_Path = String(145, 0)
i = GetWindowsDirectory(Win_Path, 145)
Win_Path = Left(Win_Path, i)
i = sndPlaySound(Win_Path + "\Media\Ding.wav", &H1) ' 发出报警声音
On Error GoTo 0
Else
If Picture1.Visible = True Then Picture1.Visible = False
End If
Last_Num_Of_Entries = TCP1.dwNum_Of_Entries
Select Case Return1 ' 判断返回值
Case 0&:
Text1 = "": Combo1.Clear
For i = 0 To TCP1.dwNum_Of_Entries - 1
Tmp3 = Str(i + 1) + " "
Select Case TCP1.TCP_Table(i).dwState ' 显示连接状态
Case 1: Tmp3 = Tmp3 + "CLOSED"
Case 2: Tmp3 = Tmp3 + "LISTENING"
Case 3: Tmp3 = Tmp3 + "SYN_SENT"
Case 4: Tmp3 = Tmp3 + "SYN_RCVD"
Case 5: Tmp3 = Tmp3 + "ESTABLISHED"
Case 6: Tmp3 = Tmp3 + "FIN_WAIT1"
Case 7: Tmp3 = Tmp3 + "FIN_WAIT2"
Case 8: Tmp3 = Tmp3 + "CLOSE_WAIT"
Case 9: Tmp3 = Tmp3 + "CLOSING"
Case 10: Tmp3 = Tmp3 + "LAST_ACK"
Case 11: Tmp3 = Tmp3 + "TIME_WAIT"
Case 12: Tmp3 = Tmp3 + "DELETE_TCB"
End Select
Combo1.AddItem Tmp3 ' 充实列表以供用户删除
Tmp3 = Tmp3 + ":" + vbCrLf + vbTab + "Local: " ' 本地IP
CopyMemory Ip_Buf(1), TCP1.TCP_Table(i).dwLocalAddr, 4
Tmp3 = Tmp3 + CStr(Ip_Buf(1)) + "." + CStr(Ip_Buf(2)) + "." _
+ CStr(Ip_Buf(3)) + "." + CStr(Ip_Buf(4))
Tmp1 = TCP1.TCP_Table(i).dwLocalPort ' 本地端口
Tmp2 = Tmp1 / 256 + (Tmp1 Mod 256) * 256
Tmp3 = Tmp3 + ":" + Str(Tmp2) + vbTab + "Remote: " ' 远程IP
CopyMemory Ip_Buf(1), TCP1.TCP_Table(i).dwRemoteAddr, 4
Tmp3 = Tmp3 + CStr(Ip_Buf(1)) + "." + CStr(Ip_Buf(2)) + "." _
+ CStr(Ip_Buf(3)) + "." + CStr(Ip_Buf(4))
Tmp1 = TCP1.TCP_Table(i).dwRemotePort ' 远程端口
Tmp2 = Tmp1 / 256 + (Tmp1 Mod 256) * 256
Tmp3 = Tmp3 + ":" + Str(Tmp2) + vbCrLf
Text1 = Text1 + Tmp3
Next i
Case 50&:
MsgBox "系统不支持该API函数": End
Case 87:
MsgBox "无效的参数": End
Case 111&:
MsgBox "缓冲区溢出": End
Case 232&:
MsgBox "无数据": End
End Select
End Sub
Private Sub 删除该连接_Click()
Dim Return1 As Long
If Combo1.ListIndex < 0 Then Exit Sub
' 将欲删连接的状态置为MIB_TCP_STATE_DELETE_TCB(值为12)
TCP1.TCP_Table(Combo1.ListIndex).dwState = 12
Return1 = SetTcpEntry(TCP1.TCP_Table(Combo1.ListIndex)) ' 执行删除
If Return1 = 0 Then
MsgBox "成功删除当前连接"
Else
MsgBox "删除连接失败"
End If
Timer1_Timer
End Sub
比如我在NETSTAT -AN里看到很多连接,跟楼上得出的情况差不多
怎么才能判断某个连接所属的进程
设置
MDGB.DWATATE=12 '这个就是清除连接
其它的自行填充然后
SETTCPENTRY(MDGB)
PVOID pTcpTable,
PDWORD pdwSize,
BOOL bOrder,
ULONG ulAf,
TCP_TABLE_CLASS TableClass,
ULONG Reserved
);这个函数行吧?
这里的pTcpTable应该是
typedef struct { DWORD dwState; DWORD dwLocalAddr; DWORD dwLocalPort; DWORD dwRemoteAddr; DWORD dwRemotePort; DWORD dwOwningPid;
} MIB_TCPROW_OWNER_PID, *PMIB_TCPROW_OWNER_PID;
吧
GetTcpEXTable
等来获取信息...等到你要结束连接的时候,把要结束的那一项的数据填充到你定义的MIB_TCPROW记录行里
DIM A AS MIB_TCPROW
A.DWSTATE=12 '关闭的关键就在这个状态标志...值是12
然后SETTCPENTRY(你填充的MIB_TCPROW记录) 当然不一定真的就能关闭... 不过能关闭的它还是会关闭的