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1
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2 // Copyright (c) 2013-2014 Sandstorm Development Group, Inc. and contributors
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3 // Licensed under the MIT License:
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4 //
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5 // Permission is hereby granted, free of charge, to any person obtaining a copy
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6 // of this software and associated documentation files (the "Software"), to deal
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7 // in the Software without restriction, including without limitation the rights
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8 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 // copies of the Software, and to permit persons to whom the Software is
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10 // furnished to do so, subject to the following conditions:
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11 //
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12 // The above copyright notice and this permission notice shall be included in
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13 // all copies or substantial portions of the Software.
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14 //
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15 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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16 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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17 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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18 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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19 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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21 // THE SOFTWARE.
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22
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23 #pragma once
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24
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25 #include "common.h"
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26 #include <cstdint>
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27
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28 KJ_BEGIN_HEADER
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29
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30 struct sockaddr;
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31
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32 namespace kj {
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33
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34 class CidrRange {
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35 public:
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36 CidrRange(StringPtr pattern);
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37
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38 static CidrRange inet4(ArrayPtr<const byte> bits, uint bitCount);
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39 static CidrRange inet6(ArrayPtr<const uint16_t> prefix, ArrayPtr<const uint16_t> suffix,
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40 uint bitCount);
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41 // Zeros are inserted between `prefix` and `suffix` to extend the address to 128 bits.
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42
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43 uint getSpecificity() const { return bitCount; }
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44
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45 bool matches(const struct sockaddr* addr) const;
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46 bool matchesFamily(int family) const;
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47
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48 String toString() const;
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49
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50 private:
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51 int family;
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52 byte bits[16];
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53 uint bitCount; // how many bits in `bits` need to match
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54
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55 CidrRange(int family, ArrayPtr<const byte> bits, uint bitCount);
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56
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57 void zeroIrrelevantBits();
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58 };
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59
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60 } // namespace kj
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61
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62 KJ_END_HEADER
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