src/corosio/src/ipv6_address.cpp
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Functions (18)
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boost::corosio::ipv6_address::ipv6_address(std::array<unsigned char, 16ul> const&)
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boost::corosio::ipv6_address::ipv6_address(boost::corosio::ipv4_address const&)
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boost::corosio::ipv6_address::ipv6_address(std::basic_string_view<char, std::char_traits<char> >)
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boost::corosio::ipv6_address::to_string[abi:cxx11]() const
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boost::corosio::ipv6_address::to_buffer(char*, unsigned long) const
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boost::corosio::ipv6_address::is_unspecified() const
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boost::corosio::ipv6_address::is_loopback() const
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boost::corosio::ipv6_address::is_multicast() const
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boost::corosio::ipv6_address::is_v4_mapped() const
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boost::corosio::ipv6_address::loopback()
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boost::corosio::operator<<(std::ostream&, boost::corosio::ipv6_address const&)
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boost::corosio::ipv6_address::print_impl(char*) const
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boost::corosio::ipv6_address::print_impl(char*) const::{lambda(unsigned char const*, unsigned char const*)#1}::operator()(unsigned char const*, unsigned char const*) const
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boost::corosio::ipv6_address::print_impl(char*) const::{lambda(char*, unsigned short)#1}::operator()(char*, unsigned short) const
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boost::corosio::(anonymous namespace)::hexdig_value(char)
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boost::corosio::(anonymous namespace)::parse_h16(char const*&, char const*, unsigned char&, unsigned char&)
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boost::corosio::(anonymous namespace)::maybe_octet(unsigned char const*)
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boost::corosio::parse_ipv6_address(std::basic_string_view<char, std::char_traits<char> >, boost::corosio::ipv6_address&)
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| Line | TLA | Hits | Source Code |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2026 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/cppalliance/corosio | ||
| 8 | // | ||
| 9 | |||
| 10 | #include <boost/corosio/ipv6_address.hpp> | ||
| 11 | #include <boost/corosio/ipv4_address.hpp> | ||
| 12 | |||
| 13 | #include <cstring> | ||
| 14 | #include <ostream> | ||
| 15 | #include <stdexcept> | ||
| 16 | |||
| 17 | namespace boost::corosio { | ||
| 18 | |||
| 19 | 117x | ipv6_address::ipv6_address(bytes_type const& bytes) noexcept | |
| 20 | { | ||
| 21 | 117x | std::memcpy(addr_.data(), bytes.data(), 16); | |
| 22 | 117x | } | |
| 23 | |||
| 24 | 3x | ipv6_address::ipv6_address(ipv4_address const& addr) noexcept | |
| 25 | { | ||
| 26 | 3x | auto const v = addr.to_bytes(); | |
| 27 | 12x | addr_ = { | |
| 28 | 3x | {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0xff, 0xff, v[0], v[1], v[2], v[3]}}; | |
| 29 | 3x | } | |
| 30 | |||
| 31 | 13x | ipv6_address::ipv6_address(std::string_view s) | |
| 32 | { | ||
| 33 | 13x | auto ec = parse_ipv6_address(s, *this); | |
| 34 | 13x | if (ec) | |
| 35 | 2x | throw std::invalid_argument("invalid IPv6 address"); | |
| 36 | 11x | } | |
| 37 | |||
| 38 | std::string | ||
| 39 | 9x | ipv6_address::to_string() const | |
| 40 | { | ||
| 41 | char buf[max_str_len]; | ||
| 42 | 9x | auto n = print_impl(buf); | |
| 43 | 18x | return std::string(buf, n); | |
| 44 | } | ||
| 45 | |||
| 46 | std::string_view | ||
| 47 | 3x | ipv6_address::to_buffer(char* dest, std::size_t dest_size) const | |
| 48 | { | ||
| 49 | 3x | if (dest_size < max_str_len) | |
| 50 | 1x | throw std::length_error("buffer too small for IPv6 address"); | |
| 51 | 2x | auto n = print_impl(dest); | |
| 52 | 2x | return std::string_view(dest, n); | |
| 53 | } | ||
| 54 | |||
| 55 | bool | ||
| 56 | 3x | ipv6_address::is_unspecified() const noexcept | |
| 57 | { | ||
| 58 | 3x | return *this == ipv6_address(); | |
| 59 | } | ||
| 60 | |||
| 61 | bool | ||
| 62 | 10x | ipv6_address::is_loopback() const noexcept | |
| 63 | { | ||
| 64 | 10x | return *this == loopback(); | |
| 65 | } | ||
| 66 | |||
| 67 | bool | ||
| 68 | 4x | ipv6_address::is_multicast() const noexcept | |
| 69 | { | ||
| 70 | 4x | return addr_[0] == 0xff; | |
| 71 | } | ||
| 72 | |||
| 73 | bool | ||
| 74 | 15x | ipv6_address::is_v4_mapped() const noexcept | |
| 75 | { | ||
| 76 | 28x | return addr_[0] == 0 && addr_[1] == 0 && addr_[2] == 0 && addr_[3] == 0 && | |
| 77 | 10x | addr_[4] == 0 && addr_[5] == 0 && addr_[6] == 0 && addr_[7] == 0 && | |
| 78 | 32x | addr_[8] == 0 && addr_[9] == 0 && addr_[10] == 0xff && | |
| 79 | 19x | addr_[11] == 0xff; | |
| 80 | } | ||
| 81 | |||
| 82 | ipv6_address | ||
| 83 | 60x | ipv6_address::loopback() noexcept | |
| 84 | { | ||
| 85 | 60x | ipv6_address a; | |
| 86 | 60x | a.addr_[15] = 1; | |
| 87 | 60x | return a; | |
| 88 | } | ||
| 89 | |||
| 90 | std::ostream& | ||
| 91 | 1x | operator<<(std::ostream& os, ipv6_address const& addr) | |
| 92 | { | ||
| 93 | char buf[ipv6_address::max_str_len]; | ||
| 94 | 1x | os << addr.to_buffer(buf, sizeof(buf)); | |
| 95 | 1x | return os; | |
| 96 | } | ||
| 97 | |||
| 98 | std::size_t | ||
| 99 | 11x | ipv6_address::print_impl(char* dest) const noexcept | |
| 100 | { | ||
| 101 | 40x | auto const count_zeroes = [](unsigned char const* first, | |
| 102 | unsigned char const* const last) { | ||
| 103 | 40x | std::size_t n = 0; | |
| 104 | 92x | while (first != last) | |
| 105 | { | ||
| 106 | 90x | if (first[0] != 0 || first[1] != 0) | |
| 107 | break; | ||
| 108 | 52x | n += 2; | |
| 109 | 52x | first += 2; | |
| 110 | } | ||
| 111 | 40x | return n; | |
| 112 | }; | ||
| 113 | |||
| 114 | 32x | auto const print_hex = [](char* dest, unsigned short v) { | |
| 115 | 32x | char const* const dig = "0123456789abcdef"; | |
| 116 | 32x | if (v >= 0x1000) | |
| 117 | { | ||
| 118 | 9x | *dest++ = dig[v >> 12]; | |
| 119 | 9x | v &= 0x0fff; | |
| 120 | 9x | *dest++ = dig[v >> 8]; | |
| 121 | 9x | v &= 0x0ff; | |
| 122 | 9x | *dest++ = dig[v >> 4]; | |
| 123 | 9x | v &= 0x0f; | |
| 124 | 9x | *dest++ = dig[v]; | |
| 125 | } | ||
| 126 | 23x | else if (v >= 0x100) | |
| 127 | { | ||
| 128 | 1x | *dest++ = dig[v >> 8]; | |
| 129 | 1x | v &= 0x0ff; | |
| 130 | 1x | *dest++ = dig[v >> 4]; | |
| 131 | 1x | v &= 0x0f; | |
| 132 | 1x | *dest++ = dig[v]; | |
| 133 | } | ||
| 134 | 22x | else if (v >= 0x10) | |
| 135 | { | ||
| 136 | 1x | *dest++ = dig[v >> 4]; | |
| 137 | 1x | v &= 0x0f; | |
| 138 | 1x | *dest++ = dig[v]; | |
| 139 | } | ||
| 140 | else | ||
| 141 | { | ||
| 142 | 21x | *dest++ = dig[v]; | |
| 143 | } | ||
| 144 | 32x | return dest; | |
| 145 | }; | ||
| 146 | |||
| 147 | 11x | auto const dest0 = dest; | |
| 148 | // find longest run of zeroes | ||
| 149 | 11x | std::size_t best_len = 0; | |
| 150 | 11x | int best_pos = -1; | |
| 151 | 11x | auto it = addr_.data(); | |
| 152 | 11x | auto const v4 = is_v4_mapped(); | |
| 153 | 22x | auto const end = v4 ? (it + addr_.size() - 4) : it + addr_.size(); | |
| 154 | |||
| 155 | 51x | while (it != end) | |
| 156 | { | ||
| 157 | 40x | auto n = count_zeroes(it, end); | |
| 158 | 40x | if (n == 0) | |
| 159 | { | ||
| 160 | 32x | it += 2; | |
| 161 | 32x | continue; | |
| 162 | } | ||
| 163 | 8x | if (n > best_len) | |
| 164 | { | ||
| 165 | 8x | best_pos = static_cast<int>(it - addr_.data()); | |
| 166 | 8x | best_len = n; | |
| 167 | } | ||
| 168 | 8x | it += n; | |
| 169 | } | ||
| 170 | |||
| 171 | 11x | it = addr_.data(); | |
| 172 | 11x | if (best_pos != 0) | |
| 173 | { | ||
| 174 | 5x | unsigned short v = static_cast<unsigned short>(it[0] * 256U + it[1]); | |
| 175 | 5x | dest = print_hex(dest, v); | |
| 176 | 5x | it += 2; | |
| 177 | } | ||
| 178 | else | ||
| 179 | { | ||
| 180 | 6x | *dest++ = ':'; | |
| 181 | 6x | it += best_len; | |
| 182 | 6x | if (it == end) | |
| 183 | 1x | *dest++ = ':'; | |
| 184 | } | ||
| 185 | |||
| 186 | 40x | while (it != end) | |
| 187 | { | ||
| 188 | 29x | *dest++ = ':'; | |
| 189 | 29x | if (it - addr_.data() == best_pos) | |
| 190 | { | ||
| 191 | 2x | it += best_len; | |
| 192 | 2x | if (it == end) | |
| 193 | 1x | *dest++ = ':'; | |
| 194 | 2x | continue; | |
| 195 | } | ||
| 196 | 27x | unsigned short v = static_cast<unsigned short>(it[0] * 256U + it[1]); | |
| 197 | 27x | dest = print_hex(dest, v); | |
| 198 | 27x | it += 2; | |
| 199 | } | ||
| 200 | |||
| 201 | 11x | if (v4) | |
| 202 | { | ||
| 203 | ipv4_address::bytes_type bytes; | ||
| 204 | 2x | bytes[0] = it[0]; | |
| 205 | 2x | bytes[1] = it[1]; | |
| 206 | 2x | bytes[2] = it[2]; | |
| 207 | 2x | bytes[3] = it[3]; | |
| 208 | 2x | ipv4_address a(bytes); | |
| 209 | 2x | *dest++ = ':'; | |
| 210 | char buf[ipv4_address::max_str_len]; | ||
| 211 | 2x | auto sv = a.to_buffer(buf, sizeof(buf)); | |
| 212 | 2x | std::memcpy(dest, sv.data(), sv.size()); | |
| 213 | 2x | dest += sv.size(); | |
| 214 | } | ||
| 215 | |||
| 216 | 11x | return static_cast<std::size_t>(dest - dest0); | |
| 217 | } | ||
| 218 | |||
| 219 | namespace { | ||
| 220 | |||
| 221 | // Convert hex character to value (0-15), or -1 if not hex | ||
| 222 | inline int | ||
| 223 | 484x | hexdig_value(char c) noexcept | |
| 224 | { | ||
| 225 | 484x | if (c >= '0' && c <= '9') | |
| 226 | 296x | return c - '0'; | |
| 227 | 188x | if (c >= 'a' && c <= 'f') | |
| 228 | 53x | return c - 'a' + 10; | |
| 229 | 135x | if (c >= 'A' && c <= 'F') | |
| 230 | 8x | return c - 'A' + 10; | |
| 231 | 127x | return -1; | |
| 232 | } | ||
| 233 | |||
| 234 | // Parse h16 (1-4 hex digits) returning 16-bit value | ||
| 235 | // Returns true on success, advances `it` | ||
| 236 | bool | ||
| 237 | 185x | parse_h16( | |
| 238 | char const*& it, | ||
| 239 | char const* end, | ||
| 240 | unsigned char& hi, | ||
| 241 | unsigned char& lo) noexcept | ||
| 242 | { | ||
| 243 | 185x | if (it == end) | |
| 244 | ✗ | return false; | |
| 245 | |||
| 246 | 185x | int d = hexdig_value(*it); | |
| 247 | 185x | if (d < 0) | |
| 248 | 2x | return false; | |
| 249 | |||
| 250 | 183x | unsigned v = static_cast<unsigned>(d); | |
| 251 | 183x | ++it; | |
| 252 | |||
| 253 | 265x | for (int i = 0; i < 3 && it != end; ++i) | |
| 254 | { | ||
| 255 | 203x | d = hexdig_value(*it); | |
| 256 | 203x | if (d < 0) | |
| 257 | 121x | break; | |
| 258 | 82x | v = (v << 4) | static_cast<unsigned>(d); | |
| 259 | 82x | ++it; | |
| 260 | } | ||
| 261 | |||
| 262 | 183x | hi = static_cast<unsigned char>((v >> 8) & 0xff); | |
| 263 | 183x | lo = static_cast<unsigned char>(v & 0xff); | |
| 264 | 183x | return true; | |
| 265 | } | ||
| 266 | |||
| 267 | // Check if a hex word could be 0..255 if interpreted as decimal | ||
| 268 | bool | ||
| 269 | 9x | maybe_octet(unsigned char const* p) noexcept | |
| 270 | { | ||
| 271 | 9x | unsigned short word = static_cast<unsigned short>(p[0]) * 256 + | |
| 272 | 9x | static_cast<unsigned short>(p[1]); | |
| 273 | 9x | if (word > 0x255) | |
| 274 | ✗ | return false; | |
| 275 | 9x | if (((word >> 4) & 0xf) > 9) | |
| 276 | ✗ | return false; | |
| 277 | 9x | if ((word & 0xf) > 9) | |
| 278 | ✗ | return false; | |
| 279 | 9x | return true; | |
| 280 | } | ||
| 281 | |||
| 282 | } // namespace | ||
| 283 | |||
| 284 | std::error_code | ||
| 285 | 76x | parse_ipv6_address(std::string_view s, ipv6_address& addr) noexcept | |
| 286 | { | ||
| 287 | 76x | auto it = s.data(); | |
| 288 | 76x | auto const end = it + s.size(); | |
| 289 | |||
| 290 | 76x | int n = 8; // words needed | |
| 291 | 76x | int b = -1; // value of n when '::' seen | |
| 292 | 76x | bool c = false; // need colon | |
| 293 | 76x | auto prev = it; | |
| 294 | 76x | ipv6_address::bytes_type bytes{}; | |
| 295 | unsigned char hi, lo; | ||
| 296 | |||
| 297 | for (;;) | ||
| 298 | { | ||
| 299 | 311x | if (it == end) | |
| 300 | { | ||
| 301 | 44x | if (b != -1) | |
| 302 | { | ||
| 303 | // end in "::" | ||
| 304 | 40x | break; | |
| 305 | } | ||
| 306 | // not enough words | ||
| 307 | 4x | return std::make_error_code(std::errc::invalid_argument); | |
| 308 | } | ||
| 309 | |||
| 310 | 267x | if (*it == ':') | |
| 311 | { | ||
| 312 | 161x | ++it; | |
| 313 | 161x | if (it == end) | |
| 314 | { | ||
| 315 | // expected ':' | ||
| 316 | 5x | return std::make_error_code(std::errc::invalid_argument); | |
| 317 | } | ||
| 318 | 156x | if (*it == ':') | |
| 319 | { | ||
| 320 | 61x | if (b == -1) | |
| 321 | { | ||
| 322 | // first "::" | ||
| 323 | 60x | ++it; | |
| 324 | 60x | --n; | |
| 325 | 60x | b = n; | |
| 326 | 60x | if (n == 0) | |
| 327 | 1x | break; | |
| 328 | 59x | c = false; | |
| 329 | 59x | continue; | |
| 330 | } | ||
| 331 | // extra "::" found | ||
| 332 | 1x | return std::make_error_code(std::errc::invalid_argument); | |
| 333 | } | ||
| 334 | 95x | if (c) | |
| 335 | { | ||
| 336 | 92x | prev = it; | |
| 337 | 92x | if (!parse_h16(it, end, hi, lo)) | |
| 338 | ✗ | return std::make_error_code(std::errc::invalid_argument); | |
| 339 | 92x | bytes[2 * (8 - n) + 0] = hi; | |
| 340 | 92x | bytes[2 * (8 - n) + 1] = lo; | |
| 341 | 92x | --n; | |
| 342 | 92x | if (n == 0) | |
| 343 | 6x | break; | |
| 344 | 86x | continue; | |
| 345 | } | ||
| 346 | // expected h16 | ||
| 347 | 3x | return std::make_error_code(std::errc::invalid_argument); | |
| 348 | } | ||
| 349 | |||
| 350 | 106x | if (*it == '.') | |
| 351 | { | ||
| 352 | 10x | if (b == -1 && n > 1) | |
| 353 | { | ||
| 354 | // not enough h16 | ||
| 355 | 5x | return std::make_error_code(std::errc::invalid_argument); | |
| 356 | } | ||
| 357 | 9x | if (!maybe_octet(&bytes[std::size_t(2) * std::size_t(7 - n)])) | |
| 358 | { | ||
| 359 | // invalid octet | ||
| 360 | ✗ | return std::make_error_code(std::errc::invalid_argument); | |
| 361 | } | ||
| 362 | // rewind the h16 and parse it as IPv4 | ||
| 363 | 9x | it = prev; | |
| 364 | 9x | ipv4_address v4; | |
| 365 | 9x | auto ec = parse_ipv4_address( | |
| 366 | 9x | std::string_view(it, static_cast<std::size_t>(end - it)), v4); | |
| 367 | 9x | if (ec) | |
| 368 | 4x | return ec; | |
| 369 | // Must consume exactly the IPv4 address portion | ||
| 370 | // Re-parse to find where it ends | ||
| 371 | 5x | auto v4_it = it; | |
| 372 | 53x | while (v4_it != end && | |
| 373 | 48x | (*v4_it == '.' || (*v4_it >= '0' && *v4_it <= '9'))) | |
| 374 | 48x | ++v4_it; | |
| 375 | // Verify it parsed correctly by re-parsing the exact substring | ||
| 376 | 5x | ipv4_address v4_check; | |
| 377 | 5x | ec = parse_ipv4_address( | |
| 378 | 5x | std::string_view(it, static_cast<std::size_t>(v4_it - it)), | |
| 379 | v4_check); | ||
| 380 | 5x | if (ec) | |
| 381 | ✗ | return ec; | |
| 382 | 5x | it = v4_it; | |
| 383 | 5x | auto const b4 = v4_check.to_bytes(); | |
| 384 | 5x | bytes[2 * (7 - n) + 0] = b4[0]; | |
| 385 | 5x | bytes[2 * (7 - n) + 1] = b4[1]; | |
| 386 | 5x | bytes[2 * (7 - n) + 2] = b4[2]; | |
| 387 | 5x | bytes[2 * (7 - n) + 3] = b4[3]; | |
| 388 | 5x | --n; | |
| 389 | 5x | break; | |
| 390 | } | ||
| 391 | |||
| 392 | 96x | auto d = hexdig_value(*it); | |
| 393 | 96x | if (b != -1 && d < 0) | |
| 394 | { | ||
| 395 | // ends in "::" | ||
| 396 | 2x | break; | |
| 397 | } | ||
| 398 | |||
| 399 | 94x | if (!c) | |
| 400 | { | ||
| 401 | 93x | prev = it; | |
| 402 | 93x | if (!parse_h16(it, end, hi, lo)) | |
| 403 | 2x | return std::make_error_code(std::errc::invalid_argument); | |
| 404 | 91x | bytes[2 * (8 - n) + 0] = hi; | |
| 405 | 91x | bytes[2 * (8 - n) + 1] = lo; | |
| 406 | 91x | --n; | |
| 407 | 91x | if (n == 0) | |
| 408 | 1x | break; | |
| 409 | 90x | c = true; | |
| 410 | 90x | continue; | |
| 411 | } | ||
| 412 | |||
| 413 | // ':' divides a word | ||
| 414 | 1x | return std::make_error_code(std::errc::invalid_argument); | |
| 415 | 235x | } | |
| 416 | |||
| 417 | // Must have consumed entire string | ||
| 418 | 55x | if (it != end) | |
| 419 | 5x | return std::make_error_code(std::errc::invalid_argument); | |
| 420 | |||
| 421 | 50x | if (b == -1) | |
| 422 | { | ||
| 423 | 2x | addr = ipv6_address{bytes}; | |
| 424 | 2x | return {}; | |
| 425 | } | ||
| 426 | |||
| 427 | 48x | if (b == n) | |
| 428 | { | ||
| 429 | // "::" last | ||
| 430 | 4x | auto const i = 2 * (7 - n); | |
| 431 | 4x | std::memset(&bytes[i], 0, 16 - i); | |
| 432 | } | ||
| 433 | 44x | else if (b == 7) | |
| 434 | { | ||
| 435 | // "::" first | ||
| 436 | 19x | auto const i = 2 * (b - n); | |
| 437 | 19x | std::memmove(&bytes[16 - i], &bytes[2], i); | |
| 438 | 19x | std::memset(&bytes[0], 0, 16 - i); | |
| 439 | } | ||
| 440 | else | ||
| 441 | { | ||
| 442 | // "::" in middle | ||
| 443 | 25x | auto const i0 = 2 * (7 - b); | |
| 444 | 25x | auto const i1 = 2 * (b - n); | |
| 445 | 25x | std::memmove(&bytes[16 - i1], &bytes[i0 + 2], i1); | |
| 446 | 25x | std::memset(&bytes[i0], 0, 16 - (i0 + i1)); | |
| 447 | } | ||
| 448 | |||
| 449 | 48x | addr = ipv6_address{bytes}; | |
| 450 | 48x | return {}; | |
| 451 | } | ||
| 452 | |||
| 453 | } // namespace boost::corosio | ||
| 454 |