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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com) | ||
| 3 | // | ||
| 4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | ||
| 5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/boostorg/url | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_URL_RFC_IMPL_IPV6_ADDRESS_RULE_IPP | ||
| 11 | #define BOOST_URL_RFC_IMPL_IPV6_ADDRESS_RULE_IPP | ||
| 12 | |||
| 13 | #include <boost/url/detail/config.hpp> | ||
| 14 | #include <boost/url/rfc/ipv6_address_rule.hpp> | ||
| 15 | #include <boost/url/rfc/ipv4_address_rule.hpp> | ||
| 16 | #include "detail/h16_rule.hpp" | ||
| 17 | #include <boost/url/grammar/charset.hpp> | ||
| 18 | #include <boost/url/grammar/hexdig_chars.hpp> | ||
| 19 | #include <boost/url/grammar/parse.hpp> | ||
| 20 | #include <boost/assert.hpp> | ||
| 21 | #include <cstring> | ||
| 22 | |||
| 23 | namespace boost { | ||
| 24 | namespace urls { | ||
| 25 | |||
| 26 | namespace detail { | ||
| 27 | |||
| 28 | // return `true` if the hex | ||
| 29 | // word could be 0..255 if | ||
| 30 | // interpreted as decimal | ||
| 31 | static | ||
| 32 | bool | ||
| 33 | 65 | maybe_octet( | |
| 34 | unsigned char const* p) noexcept | ||
| 35 | { | ||
| 36 | 65 | unsigned short word = | |
| 37 | static_cast<unsigned short>( | ||
| 38 | 65 | p[0]) * 256 + | |
| 39 | static_cast<unsigned short>( | ||
| 40 | 65 | p[1]); | |
| 41 |
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65 | if(word > 0x255) |
| 42 | 5 | return false; | |
| 43 |
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60 | if(((word >> 4) & 0xf) > 9) |
| 44 | 3 | return false; | |
| 45 |
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57 | if((word & 0xf) > 9) |
| 46 | 2 | return false; | |
| 47 | 55 | return true; | |
| 48 | } | ||
| 49 | |||
| 50 | } // detail | ||
| 51 | |||
| 52 | auto | ||
| 53 | 288 | ipv6_address_rule_t:: | |
| 54 | parse( | ||
| 55 | char const*& it, | ||
| 56 | char const* const end | ||
| 57 | ) const noexcept -> | ||
| 58 | system::result<ipv6_address> | ||
| 59 | { | ||
| 60 | 288 | int n = 8; // words needed | |
| 61 | 288 | int b = -1; // value of n | |
| 62 | // when '::' seen | ||
| 63 | 288 | bool c = false; // need colon | |
| 64 | 288 | auto prev = it; | |
| 65 | ipv6_address::bytes_type bytes; | ||
| 66 | 288 | system::result<detail::h16_rule_t::value_type> rv; | |
| 67 | for(;;) | ||
| 68 | { | ||
| 69 |
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1324 | if(it == end) |
| 70 | { | ||
| 71 |
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91 | if(b != -1) |
| 72 | { | ||
| 73 | // end in "::" | ||
| 74 | 83 | break; | |
| 75 | } | ||
| 76 |
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8 | BOOST_ASSERT(n > 0); |
| 77 | // not enough words | ||
| 78 | 8 | BOOST_URL_RETURN_EC( | |
| 79 | grammar::error::invalid); | ||
| 80 | } | ||
| 81 |
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1233 | if(*it == ':') |
| 82 | { | ||
| 83 | 794 | ++it; | |
| 84 |
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794 | if(it == end) |
| 85 | { | ||
| 86 | // expected ':' | ||
| 87 | 5 | BOOST_URL_RETURN_EC( | |
| 88 | grammar::error::invalid); | ||
| 89 | } | ||
| 90 |
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789 | if(*it == ':') |
| 91 | { | ||
| 92 |
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186 | if(b == -1) |
| 93 | { | ||
| 94 | // first "::" | ||
| 95 | 183 | ++it; | |
| 96 | 183 | --n; | |
| 97 | 183 | b = n; | |
| 98 |
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183 | if(n == 0) |
| 99 | 2 | break; | |
| 100 | 181 | c = false; | |
| 101 | 181 | continue; | |
| 102 | } | ||
| 103 | // extra "::" found | ||
| 104 | 3 | BOOST_URL_RETURN_EC( | |
| 105 | grammar::error::invalid); | ||
| 106 | } | ||
| 107 |
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603 | if(c) |
| 108 | { | ||
| 109 | 597 | prev = it; | |
| 110 | rv = grammar::parse( | ||
| 111 | it, end, | ||
| 112 | 597 | detail::h16_rule); | |
| 113 |
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597 | if(! rv) |
| 114 | 5 | return rv.error(); | |
| 115 | 592 | bytes[2*(8-n)+0] = rv->hi; | |
| 116 | 592 | bytes[2*(8-n)+1] = rv->lo; | |
| 117 | 592 | --n; | |
| 118 |
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592 | if(n == 0) |
| 119 | 51 | break; | |
| 120 | 541 | continue; | |
| 121 | } | ||
| 122 | // expected h16 | ||
| 123 | 6 | BOOST_URL_RETURN_EC( | |
| 124 | grammar::error::invalid); | ||
| 125 | } | ||
| 126 |
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439 | if(*it == '.') |
| 127 | { | ||
| 128 |
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75 | if(b == -1 && n > 1) |
| 129 | { | ||
| 130 | // not enough h16 | ||
| 131 | 10 | BOOST_URL_RETURN_EC( | |
| 132 | grammar::error::invalid); | ||
| 133 | } | ||
| 134 |
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65 | if(! detail::maybe_octet( |
| 135 | 65 | &bytes[2*(7-n)])) | |
| 136 | { | ||
| 137 | // invalid octet | ||
| 138 | 10 | BOOST_URL_RETURN_EC( | |
| 139 | grammar::error::invalid); | ||
| 140 | } | ||
| 141 | // rewind the h16 and | ||
| 142 | // parse it as ipv4 | ||
| 143 | 55 | it = prev; | |
| 144 | auto rv1 = grammar::parse( | ||
| 145 | 55 | it, end, ipv4_address_rule); | |
| 146 |
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55 | if(! rv1) |
| 147 | 22 | return rv1.error(); | |
| 148 | 33 | auto v4 = *rv1; | |
| 149 | auto const b4 = | ||
| 150 | 33 | v4.to_bytes(); | |
| 151 | 33 | bytes[2*(7-n)+0] = b4[0]; | |
| 152 | 33 | bytes[2*(7-n)+1] = b4[1]; | |
| 153 | 33 | bytes[2*(7-n)+2] = b4[2]; | |
| 154 | 33 | bytes[2*(7-n)+3] = b4[3]; | |
| 155 | 33 | --n; | |
| 156 | 33 | break; | |
| 157 | } | ||
| 158 | auto d = | ||
| 159 | 364 | grammar::hexdig_value(*it); | |
| 160 |
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364 | if( b != -1 && |
| 161 | d < 0) | ||
| 162 | { | ||
| 163 | // ends in "::" | ||
| 164 | 25 | break; | |
| 165 | } | ||
| 166 |
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339 | if(! c) |
| 167 | { | ||
| 168 | 335 | prev = it; | |
| 169 | rv = grammar::parse( | ||
| 170 | it, end, | ||
| 171 | 335 | detail::h16_rule); | |
| 172 |
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335 | if(! rv) |
| 173 | 20 | return rv.error(); | |
| 174 | 315 | bytes[2*(8-n)+0] = rv->hi; | |
| 175 | 315 | bytes[2*(8-n)+1] = rv->lo; | |
| 176 | 315 | --n; | |
| 177 |
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315 | if(n == 0) |
| 178 | 1 | break; | |
| 179 | 314 | c = true; | |
| 180 | 314 | continue; | |
| 181 | } | ||
| 182 | // ':' divides a word | ||
| 183 | 4 | BOOST_URL_RETURN_EC( | |
| 184 | grammar::error::invalid); | ||
| 185 | 1036 | } | |
| 186 |
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195 | if(b == -1) |
| 187 | 50 | return ipv6_address{bytes}; | |
| 188 |
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145 | if(b == n) |
| 189 | { | ||
| 190 | // "::" last | ||
| 191 | 34 | auto const i = | |
| 192 | 34 | 2 * (7 - n); | |
| 193 | 34 | std::memset( | |
| 194 | 34 | &bytes[i], | |
| 195 | 34 | 0, 16 - i); | |
| 196 | } | ||
| 197 |
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111 | else if(b == 7) |
| 198 | { | ||
| 199 | // "::" first | ||
| 200 | 45 | auto const i = | |
| 201 | 45 | 2 * (b - n); | |
| 202 | 90 | std::memmove( | |
| 203 | 45 | &bytes[16 - i], | |
| 204 | 45 | &bytes[2], | |
| 205 | i); | ||
| 206 | 45 | std::memset( | |
| 207 | 45 | &bytes[0], | |
| 208 | 45 | 0, 16 - i); | |
| 209 | } | ||
| 210 | else | ||
| 211 | { | ||
| 212 | // "::" in middle | ||
| 213 | 66 | auto const i0 = | |
| 214 | 66 | 2 * (7 - b); | |
| 215 | 66 | auto const i1 = | |
| 216 | 66 | 2 * (b - n); | |
| 217 | 132 | std::memmove( | |
| 218 | 66 | &bytes[16 - i1], | |
| 219 | 66 | &bytes[i0 + 2], | |
| 220 | i1); | ||
| 221 | 66 | std::memset( | |
| 222 | 66 | &bytes[i0], | |
| 223 | 66 | 0, 16 - (i0 + i1)); | |
| 224 | } | ||
| 225 | 145 | return ipv6_address{bytes}; | |
| 226 | } | ||
| 227 | |||
| 228 | } // urls | ||
| 229 | } // boost | ||
| 230 | |||
| 231 | #endif | ||
| 232 |