GetTcpTable获取开放的端口

 

////获取tcp的连接信息 模拟netstat，此处只获取本地开放的端口
  ////获取tcp的连接信息 模拟netstat，此处只获取本地开发的端口
  vector<int> VengConfig::EnumTCPTable()
  {
      vector<int> nOpenPort;
      PMIB_TCPTABLE pTcpTable = NULL;
      DWORD dwSize = 0;
      DWORD dwRetVal = ERROR_SUCCESS;

      struct   in_addr rip;
      struct   in_addr lip;
      char  szrip[32] = {0};
      char  szlip[32] = {0};
      char sLocalIP[32]={0},sRemoteIP[32]={0};
      u_short nLocalPort = 0;

      pTcpTable = (MIB_TCPTABLE *) MALLOC(sizeof(MIB_TCPTABLE2));
      if (pTcpTable == NULL) {
          printf("Error allocating memory\n");
          return nOpenPort;
      }

      dwSize = sizeof (MIB_TCPTABLE);
      if ((dwRetVal = GetTcpTable(pTcpTable, &dwSize, TRUE)) ==
          ERROR_INSUFFICIENT_BUFFER) {
              FREE(pTcpTable);
              pTcpTable = (MIB_TCPTABLE *) MALLOC(dwSize);
              if (pTcpTable == NULL) {
                  printf("Error allocating memory\n");
                  return nOpenPort;
              }
      }

      string TmpStr;
      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;

              if (pTcpTable->table[i].dwState == MIB_TCP_STATE_LISTEN)
                  pTcpTable->table[i].dwRemotePort = 0;

              strcpy_s(sLocalIP,inet_ntoa(lip));
              if ( !strcmp(sLocalIP,"127.0.0.1") )
              {
                  continue;
              }
              nLocalPort = htons((u_short)pTcpTable->table[i].dwLocalPort);
              char cPortBuf[10] = {0};
              sprintf_s(cPortBuf,"%d",nLocalPort);
              if ( TmpStr.find(cPortBuf) == -1 )
              {
                  nOpenPort.push_back(nLocalPort);
              }
              TmpStr = TmpStr + cPortBuf +",";

              //sprintf_s(szlip,sizeof(szlip),"%s:%d",inet_ntoa(lip),nLocalPort);
              //strcpy_s(sRemoteIP,inet_ntoa(rip));

              //sprintf_s(szrip,sizeof(szrip),"%s:%d",inet_ntoa(rip),htons((u_short)pTcpTable->table[i].dwRemotePort));
              //printf("TCP\t%-24s%-24s%s\r\n",szlip,szrip,TcpState[pTcpTable->table[i].dwState]);
          }
          sort(nOpenPort.begin(),nOpenPort.end());
      }
      else
      {
          printf("\tGetTcpTable failed with %d\n", dwRetVal);
          FREE(pTcpTable);
          return nOpenPort;
      }

      if (pTcpTable != NULL) {
          FREE(pTcpTable);
          pTcpTable = NULL;
      }

      return nOpenPort;
  }