1 /*

     2 * Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:  Handle and parse dhcp server response message.

    15 *

    16 */

    17 

    18 #include "dhcppsylogging.h"          // For logging

    19 #include "dhcpconstants.h"

    20 #include "dhcpdataresponsepacket.h"

    21 

    22 const TInt KLengthOverMCookie = 236;

    23 const TInt KDhcpMessageEndOption = 255;

    24 

    25 // ======== MEMBER FUNCTIONS ========

    26 

    27 // ---------------------------------------------------------------------------

    28 // TDhcpDataResponsePacket

    29 // ---------------------------------------------------------------------------

    30 //

    31 TDhcpDataResponsePacket::TDhcpDataResponsePacket()

    32     {

    33     iXid = 0;

    34     }

    35 

    36 // ---------------------------------------------------------------------------

    37 // Parses the location information part from the DHCPv4 Inform message,

    38 // Currently supported Options 123 and 99.

    39 // ---------------------------------------------------------------------------

    40 //

    41 TInt TDhcpDataResponsePacket::ParseDHCPAck ()

    42     {

    43     TRACESTRING( "TDhcpDataResponsePacket::ParseDHCPAck" );

    44     TInt dataFound = KErrNotFound;

    45     if (Length() > KLengthOverMCookie)

    46         {

    47         TPtrC8 magicCookie (KDhcpMagicCookie, sizeof(KDhcpMagicCookie));

    48         //Locate the 'magic cookie' after which the option field begins

    49         TInt offset = Find( magicCookie );

    50         if (offset!=KErrNotFound)

    51             {

    52             offset += 4; // Skip the cookie

    53             while (iBuffer[offset] != KDhcpMessageEndOption )

    54                 {

    55                 TInt messageOption = iBuffer[offset];

    56                 switch (messageOption)

    57                     {

    58                     case KDhcpMessageGeoSpatialCoordinates:

    59                         {

    60                         // Parse Option 123

    61                         TUint8 dataLength = iBuffer[offset+1];

    62                         iGeoConf = Mid( ( offset + 2 ), dataLength );

    63                         offset++;

    64                         offset += dataLength + 1;

    65                         dataFound = KErrNone;

    66                         }

    67                         break;

    68                     case KDhcpMessageCivicAddress:

    69                         {

    70                         // Parse Option 99

    71                         // GeoConfCivic can be of variable length

    72                         TUint8 dataLength = iBuffer[offset+1];

    73                         iCivicAddress = Mid( ( offset + 2 ), dataLength );

    74                         offset++;

    75                         offset += dataLength + 1;

    76                         dataFound = KErrNone;

    77                         }

    78                         break;

    79                     default:

    80                         {

    81                         offset++;

    82                         offset = offset + (iBuffer[offset]+1) ;

    83                         }

    84                         break;

    85                     }

    86                 }

    87             }

    88         }

    89     return dataFound;

    90     }

    91