{*******************************************************}
{                                                       }
{       ManagerNic                                      }
{                                                       }
{       Copyright (C) 2022 kku                          }
{                                                       }
{*******************************************************}

unit ManagerNic;

interface

uses
  Tocsg.Obj, System.SysUtils, System.Classes, Winapi.Windows,
  System.Generics.Collections;

const
//  네트워크 어댑터 Type 식별
  MIB_IF_TYPE_OTHER          = 1; // Some other type of network interface. 기타 등등
  MIB_IF_TYPE_ETHERNET       = 6; // An Ethernet network interface. 이더넷(무선 포함)
  IF_TYPE_ISO88025_TOKENRING = 9; // MIB_IF_TYPE_TOKENRING 토큰링
  MIB_IF_TYPE_FDDI           = 15; // 광
  MIB_IF_TYPE_PPP            = 23; // A PPP network interface. PPP
  MIB_IF_TYPE_LOOPBACK       = 24; // A software loopback network interface. 루프백 (localloop)
  MIB_IF_TYPE_SLIP           = 28; // An ATM network interface. SLIP
  IF_TYPE_IEEE80211          = 71; // An IEEE 802.11 wireless network interface.

type
  PNicInfo = ^TNicInfo;
  TNicInfo = record
    sName,
    sDesc,
    sIpAddr,
    sMac: AnsiString;
    dwType,
    dwIndex: DWORD;
    bDhcp: Boolean;
    nNcType: Integer;
  end;
  TNicInfoList = class(TList<PNicInfo>)
  protected
    bFreeItem_: Boolean;
    procedure Notify(const Item: PNicInfo; Action: TCollectionNotification); override;
  public
    Constructor Create;
    property FreeItem: Boolean write bFreeItem_;
  end;

  TChangeNetAdapterState = (cnasNewAdapter, cnasDelAdapter, cnasChangeIP);
  TChangeNetAdapterEvent = procedure(aState: TChangeNetAdapterState; aOldInfo, aNewInfo: PNicInfo) of object;

  TManagerNic = class(TTgObject)
  private
    ChkNetList_: TNicInfoList;
    ChangeNetAdapterEvent_: TChangeNetAdapterEvent;
  public
    Constructor Create;
    Destructor Destroy; override;

    function GetNetAdapters(var aNetList: TNicInfoList): Integer;
    function GetChangeNetAdapterInfo: Integer;

    property OnChangeNetAdapterEvent: TChangeNetAdapterEvent write ChangeNetAdapterEvent_;
    property NetList: TNicInfoList read ChkNetList_;
  end;

implementation

uses
  Tocsg.Network, Tocsg.Strings, Tocsg.Exception, Tocsg.Safe;

{ TNicInfoList }

constructor TNicInfoList.Create;
begin
  Inherited Create;
  bFreeItem_ := true;
end;

procedure TNicInfoList.Notify(const Item: PNicInfo; Action: TCollectionNotification);
begin
  if bFreeItem_ and (Action = cnRemoved) then
    Dispose(Item);
end;

{ TManagerNic }

Constructor TManagerNic.Create;
begin
  Inherited Create;
  ChangeNetAdapterEvent_ := nil;
  ChkNetList_ := TNicInfoList.Create;
  GetNetAdapters(ChkNetList_);
end;

Destructor TManagerNic.Destroy;
begin
  if ChkNetList_ <> nil then
    FreeAndNil(ChkNetList_);
  Inherited;
end;

function TManagerNic.GetNetAdapters(var aNetList: TNicInfoList): Integer;
var
  NetAdapterInfo: TNetAdapterInfo;
  pInfo: PNicInfo;
  i: Integer;
begin
  Result := 0;
  try
    aNetList.Clear;

    Guard(NetAdapterInfo, TNetAdapterInfo.Create);
    for i := 0 to NetAdapterInfo.Count - 1 do
    begin
      New(pInfo);
      ZeroMemory(pInfo, SizeOf(TNicInfo));

      with NetAdapterInfo.Items[i]^ do
      begin
        pInfo.sName := sName;
        pInfo.sDesc := sDesc;
        pInfo.sIpAddr := sIpAddrs;
        pInfo.sMac := sMacAddr;
        pInfo.dwType := dwType;
        pInfo.dwIndex := dwIndex;
        pInfo.bDhcp := bDHCP;
        pInfo.nNcType := -1; // for HE, 선언만 해주고 다른데서 처리함 22_0622 11:24:07 kku
      end;

      aNetList.Add(pInfo);
    end;

    Result := aNetList.Count;
  except
    on E: Exception do
      ETgException.TraceException(Self, E, 'Fail .. GetNetAdapters()');
  end;
end;

// 네트워크 어댑터 제거된건 sDetectIps에 포함되지 않음 22_0117 16:37:04 sunk
function TManagerNic.GetChangeNetAdapterInfo: Integer;
var
  NetList,
  AddNetList: TNicInfoList;
  i, c: Integer;
  bAdd: Boolean;
begin
  Result := 0;
//  sDetectIps := '';

  try
    if ChkNetList_ = nil then
    begin
      ChkNetList_ := TNicInfoList.Create;
      GetNetAdapters(ChkNetList_);
      exit;
    end;

    AddNetList := TNicInfoList.Create;
    AddNetList.bFreeItem_ := false;
    try
      NetList := TNicInfoList.Create;
      if GetNetAdapters(NetList) > 0 then
      begin
      // IP 변경 감지
        for i := 0 to NetList.Count - 1 do
        begin
          bAdd := true;
          for c := ChkNetList_.Count - 1 downto 0 do
          begin
            if (NetList[i].dwIndex = ChkNetList_[c].dwIndex) and
               (NetList[i].dwType = ChkNetList_[c].dwType) and
               (CompareText(NetList[i].sName, ChkNetList_[c].sName) = 0) then
            begin
              bAdd := false;
              if NetList[i].sIpAddr <> ChkNetList_[c].sIpAddr then
              begin
                Inc(Result);
              // 이전 IP가 널이거나 유효한지 판단 추가 22_0125 09:28:57 sunk
              // 네트워크 장치가 새로 추가될때 IP가 안잡히는 경우 대상이 되지 않기때문에 다시 되돌림 22_0126 09:03:47 sunk
//                if IsValidIP(ChkNetList_[c].sIpAddr) then
//                  SumString(sDetectIps, NetList[i].sIpAddr, '|');

                if Assigned(ChangeNetAdapterEvent_) then
                  ChangeNetAdapterEvent_(cnasChangeIP, ChkNetList_[c], NetList[i]);
              end;

              ChkNetList_.Delete(c);
            end;
          end;

          if bAdd then
            AddNetList.Add(NetList[i]);
        end;

      // 추가된 네트워크 어댑터 확인
        for i := 0 to AddNetList.Count - 1 do
        begin
          Inc(Result);
//          SumString(sDetectIps, AddNetList[i].sIpAddr, '|');
          if Assigned(ChangeNetAdapterEvent_) then
            ChangeNetAdapterEvent_(cnasNewAdapter, AddNetList[i], AddNetList[i]);
        end;

      // 제거된 네트워크 어댑터 확인
        for i := 0 to ChkNetList_.Count - 1 do
        begin
          Inc(Result);
          if Assigned(ChangeNetAdapterEvent_) then
            ChangeNetAdapterEvent_(cnasDelAdapter, ChkNetList_[i], ChkNetList_[i]);
        end;
      end;
    finally
      FreeAndNil(AddNetList);
      FreeAndNil(ChkNetList_);
      ChkNetList_ := NetList;
    end;
  except
    on E: Exception do
      ETgException.TraceException(Self, E, 'Fail .. GetChangeNetAdapterInfo()');
  end;
end;

end.