동적 IP, DNS 변경 함수

동적 IP와 DNS를 변경하는 함수입니다.

uses ComObj, ActiveX, UrlMon;

// ======================================================================
// SetIpConfig()
// Set IPAddress, Gateway and Subnetmask via WMI
// Arguments ...
// AIpAddress - If Null String or 'DHCP' then DHCP is ENABLED
//              else STATIC IP is set.
// AGateWay   - [Optional] If Omitted then GATEWAY is left unchanged.
// SubnetMask - [Optional] If Omited then default = '255.255.255.0'.
//
// SetDnsServers()
// Set  DNS Servers via WMI
// Arguments ...
// APrimaryDNS   - If Null String then DNS Server List is CLEARED.
// AAlternateDNS - [Optional]
//
// Return Values ...
//   0 Successful completion, no reboot required.
//   1 Successful completion, reboot required.
//  -1 Unknown OLE Error
//  64 Method not supported on this platform.
//  65 Unknown failure.
//  66 Invalid subnet mask.
//  67 An error occurred while processing an instance that was returned.
//  68 Invalid input parameter.
//  69 More than five gateways specified.
//  70 Invalid IP address.
//  71 Invalid gateway IP address.
//  72 An error occurred while accessing the registry for the info.
//  73 Invalid domain name.
//  74 Invalid host name.
//  75 No primary or secondary WINS server defined.
//  76 Invalid file.
//  77 Invalid system path.
//  78 File copy failed.
//  79 Invalid security parameter.
//  80 Unable to configure TCP/IP service.
//  81 Unable to configure DHCP service.
//  82 Unable to renew DHCP lease.
//  83 Unable to release DHCP lease.
//  84 IP not enabled on adapter.
//  85 IPX not enabled on adapter.
//  86 Frame/network number bounds error.
//  87 Invalid frame type.
//  88 Invalid network number.
//  89 Duplicate network number.
//  90 Parameter out of bounds.
//  91 Access denied.
//  92 Out of memory.
//  93 Already exists.
//  94 Path, file, or object not found.
//  95 Unable to notify service.
//  96 Unable to notify DNS service.
//  97 Interface not configurable.
//  98 Not all DHCP leases could be released or renewed.
//  100 DHCP not enabled on adapter.
// ======================================================================


// ==================================================================
// IP Address,Gateway and Subnet Mask
// EnableStatic takes array of string as a parameter
// for the Addresses. You may wish to rewrite this using
// array of string as parameter for multiple IP Addresses.
// I only have use for 1 IP address and Gateway in our application
// but it's nice to be able to expand it for other users.
// ==================================================================

function SetIpConfig(const AIpAddress : string;
                     const AGateWay : string = '';
                     const ASubnetMask : string = '') : integer;
var Retvar : integer;
    oBindObj : IDispatch;
    oNetAdapters,oNetAdapter,
    oIpAddress,oGateWay,
    oWMIService,oSubnetMask : OleVariant;
    i,iValue : longword;
    oEnum : IEnumvariant;
    oCtx : IBindCtx;
    oMk : IMoniker;
    sFileObj : widestring;
begin
  Retvar := 0;
  sFileObj := 'winmgmts:\\.\root\cimv2';

  // Create OLE [IN} Parameters
  oIpAddress := VarArrayCreate([1,1],varOleStr);
  oIpAddress[1] := AIpAddress;
  oGateWay := VarArrayCreate([1,1],varOleStr);
  oGateWay[1] := AGateWay;
  oSubnetMask := VarArrayCreate([1,1],varOleStr);
  if ASubnetMask = '' then
    oSubnetMask[1] := '255.255.255.0'
  else
    oSubnetMask[1] := ASubnetMask;

  // Connect to WMI - Emulate API GetObject()
  OleCheck(CreateBindCtx(0,oCtx));
  OleCheck(MkParseDisplayNameEx(oCtx,PWideChar(sFileObj),i,oMk));
  OleCheck(oMk.BindToObject(oCtx,nil,IUnknown,oBindObj));
  oWMIService := oBindObj;

  oNetAdapters := oWMIService.ExecQuery('Select * from ' +
                                        'Win32_NetworkAdapterConfiguration ' +
                                        'where IPEnabled=TRUE');
  oEnum := IUnknown(oNetAdapters._NewEnum) as IEnumVariant;

  while oEnum.Next(1,oNetAdapter,iValue) = 0 do begin
    try
      // Set by DHCP ? (Gateway and Subnet ignored)
      if (AIpAddress = '') or SameText(AIpAddress,'DHCP') then
        Retvar := oNetAdapter.EnableDHCP
      // Set via STATIC ?
      else begin
        Retvar := oNetAdapter.EnableStatic(oIpAddress,oSubnetMask);
        // Change Gateway ?
        if (Retvar = 0) and (AGateWay <> '') then
          Retvar := oNetAdapter.SetGateways(oGateway);

        // *** This is where we need some sort of ***
        // *** Network Mapped Resource Refresh    ***
      end;
    except
      Retvar := -1;
    end;

    oNetAdapter := Unassigned;
  end;

  oGateWay := Unassigned;
  oSubnetMask := Unassigned;
  oIpAddress := Unassigned;
  oNetAdapters := Unassigned;
  oWMIService := Unassigned;
  Result := Retvar;
end;


// ====================================================
// Set DNS Servers
// Instead of Primary and Alternate you may wish
// to rewrite this using array of string as the
// parameters as SetDNSServerSearchOrder will take
// a list of many DNS addresses. I only have use for
// Primary and Alternate.
// ====================================================

function SetDnsServers(const APrimaryDNS : string;
                       const AAlternateDNS : string = '') : integer;
var Retvar : integer;
    oBindObj : IDispatch;
    oNetAdapters,oNetAdapter,
    oDnsAddr,oWMIService : OleVariant;
    i,iValue,iSize : longword;
    oEnum : IEnumvariant;
    oCtx : IBindCtx;
    oMk : IMoniker;
    sFileObj : widestring;
begin
  Retvar := 0;
  sFileObj := 'winmgmts:\\.\root\cimv2';
  iSize := 0;
  if APrimaryDNS <> '' then inc(iSize);
  if AAlternateDNS <> '' then inc(iSize);

  // Create OLE [IN} Parameters
  if iSize > 0 then begin
   oDnsAddr := VarArrayCreate([1,iSize],varOleStr);
   oDnsAddr[1] := APrimaryDNS;
   if iSize > 1 then oDnsAddr[2] := AAlternateDNS;
  end;

  // Connect to WMI - Emulate API GetObject()
  OleCheck(CreateBindCtx(0,oCtx));
  OleCheck(MkParseDisplayNameEx(oCtx,PWideChar(sFileObj),i,oMk));
  OleCheck(oMk.BindToObject(oCtx,nil,IUnknown,oBindObj));
  oWMIService := oBindObj;

  oNetAdapters := oWMIService.ExecQuery('Select * from ' +
                                        'Win32_NetworkAdapterConfiguration ' +
                                        'where IPEnabled=TRUE');
  oEnum := IUnknown(oNetAdapters._NewEnum) as IEnumVariant;

  while oEnum.Next(1,oNetAdapter,iValue) = 0 do begin
    try
      if iSize > 0 then
        Retvar := oNetAdapter.SetDNSServerSearchOrder(oDnsAddr)
      else
        Retvar := oNetAdapter.SetDNSServerSearchOrder();
    except
      Retvar := -1;
    end;

    oNetAdapter := Unassigned;
  end;

  oDnsAddr := Unassigned;
  oNetAdapters := Unassigned;
  oWMIService := Unassigned;
  Result := Retvar;
end;



(* ----------------------------------------------------
See the Miscrosoft MSDN Documentation for the
Win32_NetworkAdapterConfiguration Class
(implemented as oNetAdatper in my examples),
There are many more calls besides EnableStatic,
EnableDHCP and SetDNBSServerSearchOrder.

Some of them are ...

DisableIPSec
EnableDHCP
EnableDNS
EnableIPFilterSec
EnableIPSec
EnableStatic
EnableWINS
ReleaseDHCPLease
ReleaseDHCPLeaseAll
RenewDHCPLease
RenewDHCPLeaseAll
SetArpAlwaysSourceRoute
SetArpUseEtherSNAP
SetDatabasePath
SetDeadGWDetect
SetDefaultTTL
SetDNSDomain
SetDNSServerSearchOrder
SetDNSSuffixSearchOrder
SetDynamicDNSRegistration
SetForwardBufferMemory Specifies
SetGateways
SetIGMPLevel
SetIPConnectionMetric
SetIPUseZeroBroadcast
SetIPXFrameTypeNetworkPairs
SetIPXVirtualNetworkNumber
SetKeepAliveInterval
SetKeepAliveTime
SetNumForwardPackets
SetPMTUBHDetect
SetPMTUDiscovery
SetTcpipNetbios
SetTcpMaxConnectRetransmissions
SetTcpMaxDataRetransmissions
SetTcpNumConnections
SetTcpUseRFC1122UrgentPointer
SetTcpWindowSize
SetWINSServer
------------------------------------------------ *)

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