1 /*
2  *  Copyright (c) 2022, The OpenThread Authors.
3  *  All rights reserved.
4  *
5  *  Redistribution and use in source and binary forms, with or without
6  *  modification, are permitted provided that the following conditions are met:
7  *  1. Redistributions of source code must retain the above copyright
8  *     notice, this list of conditions and the following disclaimer.
9  *  2. Redistributions in binary form must reproduce the above copyright
10  *     notice, this list of conditions and the following disclaimer in the
11  *     documentation and/or other materials provided with the distribution.
12  *  3. Neither the name of the copyright holder nor the
13  *     names of its contributors may be used to endorse or promote products
14  *     derived from this software without specific prior written permission.
15  *
16  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17  *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18  *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19  *  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20  *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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25  *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26  *  POSSIBILITY OF SUCH DAMAGE.
27  */
28 
29 /**
30  * @file
31  *   This file includes definitions for managing the Network Name.
32  *
33  */
34 
35 #ifndef MESHCOP_NETWORK_NAME_HPP_
36 #define MESHCOP_NETWORK_NAME_HPP_
37 
38 #include "openthread-core-config.h"
39 
40 #include <openthread/dataset.h>
41 
42 #include "common/as_core_type.hpp"
43 #include "common/data.hpp"
44 #include "common/equatable.hpp"
45 #include "common/locator.hpp"
46 #include "common/non_copyable.hpp"
47 #include "common/string.hpp"
48 
49 namespace ot {
50 namespace MeshCoP {
51 
52 /**
53  * Represents a name string as data (pointer to a char buffer along with a length).
54  *
55  * @note The char array does NOT need to be null terminated.
56  *
57  */
58 class NameData : private Data<kWithUint8Length>
59 {
60     friend class NetworkName;
61 
62 public:
63     /**
64      * Initializes the NameData object.
65      *
66      * @param[in] aBuffer   A pointer to a `char` buffer (does not need to be null terminated).
67      * @param[in] aLength   The length (number of chars) in the buffer.
68      *
69      */
NameData(const char * aBuffer,uint8_t aLength)70     NameData(const char *aBuffer, uint8_t aLength) { Init(aBuffer, aLength); }
71 
72     /**
73      * Returns the pointer to char buffer (not necessarily null terminated).
74      *
75      * @returns The pointer to the char buffer.
76      *
77      */
GetBuffer(void) const78     const char *GetBuffer(void) const { return reinterpret_cast<const char *>(GetBytes()); }
79 
80     /**
81      * Returns the length (number of chars in buffer).
82      *
83      * @returns The name length.
84      *
85      */
GetLength(void) const86     uint8_t GetLength(void) const { return Data<kWithUint8Length>::GetLength(); }
87 
88     /**
89      * Copies the name data into a given char buffer with a given size.
90      *
91      * The given buffer is cleared (`memset` to zero) before copying the name into it. The copied string
92      * in @p aBuffer is NOT necessarily null terminated.
93      *
94      * @param[out] aBuffer   A pointer to a buffer where to copy the name into.
95      * @param[in]  aMaxSize  Size of @p aBuffer (maximum number of chars to write into @p aBuffer).
96      *
97      * @returns The actual number of chars copied into @p aBuffer.
98      *
99      */
100     uint8_t CopyTo(char *aBuffer, uint8_t aMaxSize) const;
101 };
102 
103 /**
104  * Represents an Network Name.
105  *
106  */
107 class NetworkName : public otNetworkName, public Unequatable<NetworkName>
108 {
109 public:
110     static constexpr const char *kNetworkNameInit = "OpenThread";
111     static constexpr const char *kDomainNameInit  = "DefaultDomain";
112 
113     /**
114      * This constant specified the maximum number of chars in Network Name (excludes null char).
115      *
116      */
117     static constexpr uint8_t kMaxSize = OT_NETWORK_NAME_MAX_SIZE;
118 
119     /**
120      * Initializes the Network Name as an empty string.
121      *
122      */
NetworkName(void)123     NetworkName(void) { m8[0] = '\0'; }
124 
125     /**
126      * Gets the Network Name as a null terminated C string.
127      *
128      * @returns The Network Name as a null terminated C string array.
129      *
130      */
GetAsCString(void) const131     const char *GetAsCString(void) const { return m8; }
132 
133     /**
134      * Gets the Network Name as NameData.
135      *
136      * @returns The Network Name as NameData.
137      *
138      */
139     NameData GetAsData(void) const;
140 
141     /**
142      * Sets the Network Name from a given null terminated C string.
143      *
144      * Also validates that the given @p aNameString follows UTF-8 encoding and can fit in `kMaxSize`
145      * chars.
146      *
147      * @param[in] aNameString      A name C string.
148      *
149      * @retval kErrorNone          Successfully set the Network Name.
150      * @retval kErrorAlready       The name is already set to the same string.
151      * @retval kErrorInvalidArgs   Given name is invalid (too long or does not follow UTF-8 encoding).
152      *
153      */
154     Error Set(const char *aNameString);
155 
156     /**
157      * Sets the Network Name.
158      *
159      * @param[in]  aNameData           A reference to name data.
160      *
161      * @retval kErrorNone          Successfully set the Network Name.
162      * @retval kErrorAlready       The name is already set to the same string.
163      * @retval kErrorInvalidArgs   Given name is too long.
164      *
165      */
166     Error Set(const NameData &aNameData);
167 
168     /**
169      * Overloads operator `==` to evaluate whether or not two given `NetworkName` objects are equal.
170      *
171      * @param[in]  aOther  The other `NetworkName` to compare with.
172      *
173      * @retval TRUE   If the two are equal.
174      * @retval FALSE  If the two are not equal.
175      *
176      */
177     bool operator==(const NetworkName &aOther) const;
178 };
179 
180 #if (OPENTHREAD_CONFIG_THREAD_VERSION >= OT_THREAD_VERSION_1_2)
181 /**
182  * Represents a Thread Domain Name.
183  *
184  */
185 typedef NetworkName DomainName;
186 #endif
187 
188 /**
189  * Manages the Network Name value.
190  *
191  */
192 class NetworkNameManager : public InstanceLocator, private NonCopyable
193 {
194 public:
195     /**
196      * Constructor.
197      *
198      * @param[in]  aInstance  A reference to the OpenThread instance.
199      *
200      */
201     explicit NetworkNameManager(Instance &aInstance);
202 
203     /**
204      * Returns the Network Name.
205      *
206      * @returns The Network Name.
207      *
208      */
GetNetworkName(void) const209     const NetworkName &GetNetworkName(void) const { return mNetworkName; }
210 
211     /**
212      * Sets the Network Name.
213      *
214      * @param[in]  aNameString   A pointer to a string character array. Must be null terminated.
215      *
216      * @retval kErrorNone          Successfully set the Network Name.
217      * @retval kErrorInvalidArgs   Given name is too long.
218      *
219      */
220     Error SetNetworkName(const char *aNameString);
221 
222     /**
223      * Sets the Network Name.
224      *
225      * @param[in]  aNameData     A name data (pointer to char buffer and length).
226      *
227      * @retval kErrorNone          Successfully set the Network Name.
228      * @retval kErrorInvalidArgs   Given name is too long.
229      *
230      */
231     Error SetNetworkName(const NameData &aNameData);
232 
233 #if (OPENTHREAD_CONFIG_THREAD_VERSION >= OT_THREAD_VERSION_1_2)
234     /**
235      * Returns the Thread Domain Name.
236      *
237      * @returns The Thread Domain Name.
238      *
239      */
GetDomainName(void) const240     const DomainName &GetDomainName(void) const { return mDomainName; }
241 
242     /**
243      * Sets the Thread Domain Name.
244      *
245      * @param[in]  aNameString   A pointer to a string character array. Must be null terminated.
246      *
247      * @retval kErrorNone          Successfully set the Thread Domain Name.
248      * @retval kErrorInvalidArgs   Given name is too long.
249      *
250      */
251     Error SetDomainName(const char *aNameString);
252 
253     /**
254      * Sets the Thread Domain Name.
255      *
256      * @param[in]  aNameData     A name data (pointer to char buffer and length).
257      *
258      * @retval kErrorNone          Successfully set the Thread Domain Name.
259      * @retval kErrorInvalidArgs   Given name is too long.
260      *
261      */
262     Error SetDomainName(const NameData &aNameData);
263 #endif // (OPENTHREAD_CONFIG_THREAD_VERSION >= OT_THREAD_VERSION_1_2)
264 
265 private:
266     Error SignalNetworkNameChange(Error aError);
267 
268     NetworkName mNetworkName;
269 
270 #if (OPENTHREAD_CONFIG_THREAD_VERSION >= OT_THREAD_VERSION_1_2)
271     DomainName mDomainName;
272 #endif
273 };
274 
275 } // namespace MeshCoP
276 
277 DefineCoreType(otNetworkName, MeshCoP::NetworkName);
278 
279 } // namespace ot
280 
281 #endif // MESHCOP_EXTENDED_PANID_HPP_
282