查找TCP连接状态

最新推荐文章于 2024-05-26 13:16:28 发布

转载最新推荐文章于 2024-05-26 13:16:28 发布 · 678 阅读

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#tcp #null #buffer #include #system #网络

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#include "Iphlpapi.h"
#include <malloc.h>
#include "Winsock2.h"
#include <stdlib.h>

#pragma comment(lib, "Iphlpapi.lib")
#pragma comment(lib, "ws2_32.lib")

static char TcpState[][32] =
{
     "???",
  "CLOSED",
  "LISTENING",
  "SYN_SENT",
  "SEN_RECEIVED",
  "ESTABLISHED",
  "FIN_WAIT",
  "FIN_WAIT2",
  "CLOSE_WAIT",
  "CLOSING",
  "LAST_ACK",
  "TIME_WAIT"
};

int IsMyTcpEstablished(CString strForeignTcpPort)
{
PMIB_TCPTABLE pTcpTable = NULL;
DWORD dwSize = 0;
DWORD dwRetVal = ERROR_SUCCESS;

struct   in_addr rip;
struct   in_addr lip;
char szrip[32] = {0}; //临时存放TCP连接的本地IP
char szlip[32] = {0}; //临时存放TCP连接的外地IP
CString strRip = "";
CString strTcpState = "";

//获得pTcpTable所需要的真实长度,dwSize
if (GetTcpTable(pTcpTable, &dwSize, TRUE) == ERROR_INSUFFICIENT_BUFFER)
{
  pTcpTable = (MIB_TCPTABLE*) malloc ((UINT) dwSize);
}
else
{
  TRACE("ERROR");
  return 0;
}

TRACE("Active Connections/n/n");
    TRACE("Proto/t%-24s%-24s%s/n","Local Address","Foreign Address","State");

if ((dwRetVal = GetTcpTable(pTcpTable, &dwSize, TRUE)) == NO_ERROR)
{
  for (int i = 0; i < (int) pTcpTable->dwNumEntries; i++)
  {
   rip.S_un.S_addr = pTcpTable->table[i].dwRemoteAddr;
   lip.S_un.S_addr = pTcpTable->table[i].dwLocalAddr;
   //监听端口，远程主机端口为0，但函数返回是有值的，不知道它是怎么考虑的
   if (pTcpTable->table[i].dwState == MIB_TCP_STATE_LISTEN)
    pTcpTable->table[i].dwRemotePort = 0;

   //dwLocalPort，dwRemotePort 是网络字节
   _snprintf(szlip,sizeof(szlip),"%s:%d",inet_ntoa(lip),htons((u_short)pTcpTable->table[i].dwLocalPort));
   _snprintf(szrip,sizeof(szrip),"%s:%d",inet_ntoa(rip),htons((u_short)pTcpTable->table[i].dwRemotePort));
   TRACE(" TCP/t%-24s%-24s%s/n",szlip,szrip,TcpState[pTcpTable->table[i].dwState]);
   strRip.Format("%s", szrip);
   strTcpState.Format("%s", TcpState[pTcpTable->table[i].dwState]);
   if(strForeignTcpPort == strRip && strTcpState == "ESTABLISHED")
   {
    if(pTcpTable != NULL)
    {
     free(pTcpTable);
     pTcpTable = NULL;
    }
    TRACE("Find!");
    return 1;
   }
  }
}
else
{
  TRACE("/tCall to GetTcpTable failed./n");

  LPVOID lpMsgBuf;

  if (FormatMessage(
   FORMAT_MESSAGE_ALLOCATE_BUFFER |
   FORMAT_MESSAGE_FROM_SYSTEM |
   FORMAT_MESSAGE_IGNORE_INSERTS,
   NULL,
   dwRetVal,
   MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
   (LPTSTR) &lpMsgBuf,
   0,
   NULL ))
  {
   TRACE("/tError: %s", lpMsgBuf);
  }
  LocalFree( lpMsgBuf );
}
if(pTcpTable != NULL)
{
  free(pTcpTable);
  pTcpTable = NULL;
}
TRACE("ERROR");
return 0;
}