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1 // Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies). |
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2 // All rights reserved. |
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3 // This component and the accompanying materials are made available |
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4 // under the terms of "Eclipse Public License v1.0" |
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5 // which accompanies this distribution, and is available |
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6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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7 // |
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8 // Initial Contributors: |
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9 // Nokia Corporation - initial contribution. |
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10 // |
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11 // Contributors: |
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12 // |
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13 // Description: |
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14 // llmnrconflict.h - Interface definitions LLMNR name conflict notification |
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15 // Interface definitions for the LLMNR name conflict notification |
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16 // |
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17 |
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18 |
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19 |
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20 /** |
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21 @file llmnrconflict.h |
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22 @publishedPartner |
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23 @released |
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24 */ |
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25 |
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26 #ifndef __LLMNRCONFLICT_H__ |
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27 #define __LLMNRCONFLICT_H__ |
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28 |
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29 #include <es_sock.h> |
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30 |
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31 /** |
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32 * The notification UID |
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33 */ |
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34 TInt KLlmnrConflictNotifyUid = 0x101F6D23; |
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35 |
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36 class TLlmnrConflictName |
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37 { |
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38 public: |
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39 inline TBool IsSafe() const; |
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40 THostName iName; //< The host name. |
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41 }; |
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42 |
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43 class TLlmnrConflictNotify : public TLlmnrConflictName |
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44 /** |
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45 * Conflict notification message format. |
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46 * |
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47 * The base iName contains the link local name which is conflict |
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48 * with some other host on some interface assotiated with the |
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49 * indicated IAP (iIAPId). |
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50 */ |
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51 { |
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52 public: |
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53 |
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54 TUint32 iIAPId; //< ID of selected IAP |
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55 TUint32 iNetworkId; //< ID of Network to which IAP belongs |
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56 }; |
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57 |
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58 /** |
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59 * The reply from notifier only has the replacement host name. |
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60 * |
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61 * The the nofitier completes with KErrNone, the reply message can contain |
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62 * a the new name. If this new name is also colliding with someone, another |
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63 * notify is issued. |
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64 * |
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65 * If the notifier does not want LLMNR to try an alternate name, it should |
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66 * either complete with some error (KErrCancel for example), or KErrNone |
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67 * with empty replacement name (iName.Length() == 0). |
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68 */ |
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69 typedef TLlmnrConflictName TLlmnrConflictReply; |
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70 |
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71 |
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72 TBool TLlmnrConflictName::IsSafe() const |
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73 /** |
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74 * Test if iName really is a TBuf derived descriptor. |
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75 */ |
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76 { |
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77 // This test is defined, because this structure is passed as a parameter, |
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78 // and any sender of the message can crash the receiver by placing tailored "garbage" |
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79 // on TBuf descriptor. The receiver has no official way of validating that TBuf |
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80 // descriptor is correct, and the garbage can be such that any reference to the |
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81 // content of TBuf will cause panic (for example place into iTypeLength field a |
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82 // value that implies TPtr and NULL into actual buffer address). |
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83 // |
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84 // This method gives some (but not 100%) confidence that accessing the iName |
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85 // does not cause a panic. This test works on assumtion that first TInt of |
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86 // the descriptor holds "type length" information, and that type of a TBuf is |
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87 // 0. |
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88 // |
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89 // Something like this sbould be provided by the descriptor class itself! |
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90 // |
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91 return ((iName.Length() | 0x30000000) == (TInt &)iName && // ... is really a TBuf? |
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92 iName.Length() <= iName.MaxLength() && // ... length & maxlength seem reasonable |
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93 iName.MaxSize() >= (sizeof(THostName) - 2*sizeof(TInt))); |
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94 } |
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95 |
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96 #endif |