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- // Copyright (c) 2015 The Chromium Authors. All rights reserved.
- // Use of this source code is governed by a BSD-style license that can be
- // found in the LICENSE file.
- #include "net/base/ip_address.h"
- #include <algorithm>
- #include <climits>
- #include "base/check_op.h"
- #include "base/containers/stack_container.h"
- #include "base/notreached.h"
- #include "base/strings/strcat.h"
- #include "base/strings/string_piece.h"
- #include "base/strings/string_split.h"
- #include "base/strings/stringprintf.h"
- #include "net/base/parse_number.h"
- #include "url/gurl.h"
- #include "url/url_canon_ip.h"
- namespace net {
- namespace {
- // The prefix for IPv6 mapped IPv4 addresses.
- // https://tools.ietf.org/html/rfc4291#section-2.5.5.2
- constexpr uint8_t kIPv4MappedPrefix[] = {0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0xFF, 0xFF};
- // Note that this function assumes:
- // * |ip_address| is at least |prefix_length_in_bits| (bits) long;
- // * |ip_prefix| is at least |prefix_length_in_bits| (bits) long.
- bool IPAddressPrefixCheck(const IPAddressBytes& ip_address,
- const uint8_t* ip_prefix,
- size_t prefix_length_in_bits) {
- // Compare all the bytes that fall entirely within the prefix.
- size_t num_entire_bytes_in_prefix = prefix_length_in_bits / 8;
- for (size_t i = 0; i < num_entire_bytes_in_prefix; ++i) {
- if (ip_address[i] != ip_prefix[i])
- return false;
- }
- // In case the prefix was not a multiple of 8, there will be 1 byte
- // which is only partially masked.
- size_t remaining_bits = prefix_length_in_bits % 8;
- if (remaining_bits != 0) {
- uint8_t mask = 0xFF << (8 - remaining_bits);
- size_t i = num_entire_bytes_in_prefix;
- if ((ip_address[i] & mask) != (ip_prefix[i] & mask))
- return false;
- }
- return true;
- }
- // Returns false if |ip_address| matches any of the reserved IPv4 ranges. This
- // method operates on a list of reserved IPv4 ranges. Some ranges are
- // consolidated.
- // Sources for info:
- // www.iana.org/assignments/ipv4-address-space/ipv4-address-space.xhtml
- // www.iana.org/assignments/iana-ipv4-special-registry/
- // iana-ipv4-special-registry.xhtml
- bool IsPubliclyRoutableIPv4(const IPAddressBytes& ip_address) {
- // Different IP versions have different range reservations.
- DCHECK_EQ(IPAddress::kIPv4AddressSize, ip_address.size());
- struct {
- const uint8_t address[4];
- size_t prefix_length_in_bits;
- } static const kReservedIPv4Ranges[] = {
- {{0, 0, 0, 0}, 8}, {{10, 0, 0, 0}, 8}, {{100, 64, 0, 0}, 10},
- {{127, 0, 0, 0}, 8}, {{169, 254, 0, 0}, 16}, {{172, 16, 0, 0}, 12},
- {{192, 0, 0, 0}, 24}, {{192, 0, 2, 0}, 24}, {{192, 88, 99, 0}, 24},
- {{192, 168, 0, 0}, 16}, {{198, 18, 0, 0}, 15}, {{198, 51, 100, 0}, 24},
- {{203, 0, 113, 0}, 24}, {{224, 0, 0, 0}, 3}};
- for (const auto& range : kReservedIPv4Ranges) {
- if (IPAddressPrefixCheck(ip_address, range.address,
- range.prefix_length_in_bits)) {
- return false;
- }
- }
- return true;
- }
- // Returns false if |ip_address| matches any of the IPv6 ranges IANA reserved
- // for local networks. This method operates on an allowlist of non-reserved
- // IPv6 ranges, plus the list of reserved IPv4 ranges mapped to IPv6.
- // Sources for info:
- // www.iana.org/assignments/ipv6-address-space/ipv6-address-space.xhtml
- bool IsPubliclyRoutableIPv6(const IPAddressBytes& ip_address) {
- DCHECK_EQ(IPAddress::kIPv6AddressSize, ip_address.size());
- struct {
- const uint8_t address_prefix[2];
- size_t prefix_length_in_bits;
- } static const kPublicIPv6Ranges[] = {// 2000::/3 -- Global Unicast
- {{0x20, 0}, 3},
- // ff00::/8 -- Multicast
- {{0xff, 0}, 8}};
- for (const auto& range : kPublicIPv6Ranges) {
- if (IPAddressPrefixCheck(ip_address, range.address_prefix,
- range.prefix_length_in_bits)) {
- return true;
- }
- }
- IPAddress addr(ip_address);
- if (addr.IsIPv4MappedIPv6()) {
- IPAddress ipv4 = ConvertIPv4MappedIPv6ToIPv4(addr);
- return IsPubliclyRoutableIPv4(ipv4.bytes());
- }
- return false;
- }
- bool ParseIPLiteralToBytes(const base::StringPiece& ip_literal,
- IPAddressBytes* bytes) {
- // |ip_literal| could be either an IPv4 or an IPv6 literal. If it contains
- // a colon however, it must be an IPv6 address.
- if (ip_literal.find(':') != base::StringPiece::npos) {
- // GURL expects IPv6 hostnames to be surrounded with brackets.
- std::string host_brackets = base::StrCat({"[", ip_literal, "]"});
- url::Component host_comp(0, host_brackets.size());
- // Try parsing the hostname as an IPv6 literal.
- bytes->Resize(16); // 128 bits.
- return url::IPv6AddressToNumber(host_brackets.data(), host_comp,
- bytes->data());
- }
- // Otherwise the string is an IPv4 address.
- bytes->Resize(4); // 32 bits.
- url::Component host_comp(0, ip_literal.size());
- int num_components;
- url::CanonHostInfo::Family family = url::IPv4AddressToNumber(
- ip_literal.data(), host_comp, bytes->data(), &num_components);
- return family == url::CanonHostInfo::IPV4;
- }
- } // namespace
- IPAddressBytes::IPAddressBytes() : size_(0) {}
- IPAddressBytes::IPAddressBytes(const uint8_t* data, size_t data_len) {
- Assign(data, data_len);
- }
- IPAddressBytes::~IPAddressBytes() = default;
- IPAddressBytes::IPAddressBytes(IPAddressBytes const& other) = default;
- void IPAddressBytes::Assign(const uint8_t* data, size_t data_len) {
- size_ = data_len;
- CHECK_GE(16u, data_len);
- std::copy_n(data, data_len, bytes_.data());
- }
- bool IPAddressBytes::operator<(const IPAddressBytes& other) const {
- if (size_ == other.size_)
- return std::lexicographical_compare(begin(), end(), other.begin(),
- other.end());
- return size_ < other.size_;
- }
- bool IPAddressBytes::operator==(const IPAddressBytes& other) const {
- return size_ == other.size_ && std::equal(begin(), end(), other.begin());
- }
- bool IPAddressBytes::operator!=(const IPAddressBytes& other) const {
- return !(*this == other);
- }
- IPAddress::IPAddress() = default;
- IPAddress::IPAddress(const IPAddress& other) = default;
- IPAddress::IPAddress(const IPAddressBytes& address) : ip_address_(address) {}
- IPAddress::IPAddress(const uint8_t* address, size_t address_len)
- : ip_address_(address, address_len) {}
- IPAddress::IPAddress(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3) {
- ip_address_.push_back(b0);
- ip_address_.push_back(b1);
- ip_address_.push_back(b2);
- ip_address_.push_back(b3);
- }
- IPAddress::IPAddress(uint8_t b0,
- uint8_t b1,
- uint8_t b2,
- uint8_t b3,
- uint8_t b4,
- uint8_t b5,
- uint8_t b6,
- uint8_t b7,
- uint8_t b8,
- uint8_t b9,
- uint8_t b10,
- uint8_t b11,
- uint8_t b12,
- uint8_t b13,
- uint8_t b14,
- uint8_t b15) {
- ip_address_.push_back(b0);
- ip_address_.push_back(b1);
- ip_address_.push_back(b2);
- ip_address_.push_back(b3);
- ip_address_.push_back(b4);
- ip_address_.push_back(b5);
- ip_address_.push_back(b6);
- ip_address_.push_back(b7);
- ip_address_.push_back(b8);
- ip_address_.push_back(b9);
- ip_address_.push_back(b10);
- ip_address_.push_back(b11);
- ip_address_.push_back(b12);
- ip_address_.push_back(b13);
- ip_address_.push_back(b14);
- ip_address_.push_back(b15);
- }
- IPAddress::~IPAddress() = default;
- bool IPAddress::IsIPv4() const {
- return ip_address_.size() == kIPv4AddressSize;
- }
- bool IPAddress::IsIPv6() const {
- return ip_address_.size() == kIPv6AddressSize;
- }
- bool IPAddress::IsValid() const {
- return IsIPv4() || IsIPv6();
- }
- bool IPAddress::IsPubliclyRoutable() const {
- if (IsIPv4()) {
- return IsPubliclyRoutableIPv4(ip_address_);
- } else if (IsIPv6()) {
- return IsPubliclyRoutableIPv6(ip_address_);
- }
- return true;
- }
- bool IPAddress::IsZero() const {
- for (auto x : ip_address_) {
- if (x != 0)
- return false;
- }
- return !empty();
- }
- bool IPAddress::IsIPv4MappedIPv6() const {
- return IsIPv6() && IPAddressStartsWith(*this, kIPv4MappedPrefix);
- }
- bool IPAddress::IsLoopback() const {
- // 127.0.0.1/8
- if (IsIPv4())
- return ip_address_[0] == 127;
- // ::1
- if (IsIPv6()) {
- for (size_t i = 0; i + 1 < ip_address_.size(); ++i) {
- if (ip_address_[i] != 0)
- return false;
- }
- return ip_address_.back() == 1;
- }
- return false;
- }
- bool IPAddress::IsLinkLocal() const {
- // 169.254.0.0/16
- if (IsIPv4())
- return (ip_address_[0] == 169) && (ip_address_[1] == 254);
- // [::ffff:169.254.0.0]/112
- if (IsIPv4MappedIPv6())
- return (ip_address_[12] == 169) && (ip_address_[13] == 254);
- // [fe80::]/10
- if (IsIPv6())
- return (ip_address_[0] == 0xFE) && ((ip_address_[1] & 0xC0) == 0x80);
- return false;
- }
- bool IPAddress::AssignFromIPLiteral(const base::StringPiece& ip_literal) {
- bool success = ParseIPLiteralToBytes(ip_literal, &ip_address_);
- if (!success)
- ip_address_.Resize(0);
- return success;
- }
- std::vector<uint8_t> IPAddress::CopyBytesToVector() const {
- return std::vector<uint8_t>(ip_address_.begin(), ip_address_.end());
- }
- // static
- IPAddress IPAddress::IPv4Localhost() {
- static const uint8_t kLocalhostIPv4[] = {127, 0, 0, 1};
- return IPAddress(kLocalhostIPv4);
- }
- // static
- IPAddress IPAddress::IPv6Localhost() {
- static const uint8_t kLocalhostIPv6[] = {0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 1};
- return IPAddress(kLocalhostIPv6);
- }
- // static
- IPAddress IPAddress::AllZeros(size_t num_zero_bytes) {
- CHECK_LE(num_zero_bytes, 16u);
- IPAddress result;
- for (size_t i = 0; i < num_zero_bytes; ++i)
- result.ip_address_.push_back(0u);
- return result;
- }
- // static
- IPAddress IPAddress::IPv4AllZeros() {
- return AllZeros(kIPv4AddressSize);
- }
- // static
- IPAddress IPAddress::IPv6AllZeros() {
- return AllZeros(kIPv6AddressSize);
- }
- bool IPAddress::operator==(const IPAddress& that) const {
- return ip_address_ == that.ip_address_;
- }
- bool IPAddress::operator!=(const IPAddress& that) const {
- return ip_address_ != that.ip_address_;
- }
- bool IPAddress::operator<(const IPAddress& that) const {
- // Sort IPv4 before IPv6.
- if (ip_address_.size() != that.ip_address_.size()) {
- return ip_address_.size() < that.ip_address_.size();
- }
- return ip_address_ < that.ip_address_;
- }
- std::string IPAddress::ToString() const {
- std::string str;
- url::StdStringCanonOutput output(&str);
- if (IsIPv4()) {
- url::AppendIPv4Address(ip_address_.data(), &output);
- } else if (IsIPv6()) {
- url::AppendIPv6Address(ip_address_.data(), &output);
- }
- output.Complete();
- return str;
- }
- std::string IPAddressToStringWithPort(const IPAddress& address, uint16_t port) {
- std::string address_str = address.ToString();
- if (address_str.empty())
- return address_str;
- if (address.IsIPv6()) {
- // Need to bracket IPv6 addresses since they contain colons.
- return base::StringPrintf("[%s]:%d", address_str.c_str(), port);
- }
- return base::StringPrintf("%s:%d", address_str.c_str(), port);
- }
- std::string IPAddressToPackedString(const IPAddress& address) {
- return std::string(reinterpret_cast<const char*>(address.bytes().data()),
- address.size());
- }
- IPAddress ConvertIPv4ToIPv4MappedIPv6(const IPAddress& address) {
- DCHECK(address.IsIPv4());
- // IPv4-mapped addresses are formed by:
- // <80 bits of zeros> + <16 bits of ones> + <32-bit IPv4 address>.
- base::StackVector<uint8_t, 16> bytes;
- bytes->insert(bytes->end(), std::begin(kIPv4MappedPrefix),
- std::end(kIPv4MappedPrefix));
- bytes->insert(bytes->end(), address.bytes().begin(), address.bytes().end());
- return IPAddress(bytes->data(), bytes->size());
- }
- IPAddress ConvertIPv4MappedIPv6ToIPv4(const IPAddress& address) {
- DCHECK(address.IsIPv4MappedIPv6());
- base::StackVector<uint8_t, 16> bytes;
- bytes->insert(bytes->end(),
- address.bytes().begin() + std::size(kIPv4MappedPrefix),
- address.bytes().end());
- return IPAddress(bytes->data(), bytes->size());
- }
- bool IPAddressMatchesPrefix(const IPAddress& ip_address,
- const IPAddress& ip_prefix,
- size_t prefix_length_in_bits) {
- // Both the input IP address and the prefix IP address should be either IPv4
- // or IPv6.
- DCHECK(ip_address.IsValid());
- DCHECK(ip_prefix.IsValid());
- DCHECK_LE(prefix_length_in_bits, ip_prefix.size() * 8);
- // In case we have an IPv6 / IPv4 mismatch, convert the IPv4 addresses to
- // IPv6 addresses in order to do the comparison.
- if (ip_address.size() != ip_prefix.size()) {
- if (ip_address.IsIPv4()) {
- return IPAddressMatchesPrefix(ConvertIPv4ToIPv4MappedIPv6(ip_address),
- ip_prefix, prefix_length_in_bits);
- }
- return IPAddressMatchesPrefix(ip_address,
- ConvertIPv4ToIPv4MappedIPv6(ip_prefix),
- 96 + prefix_length_in_bits);
- }
- return IPAddressPrefixCheck(ip_address.bytes(), ip_prefix.bytes().data(),
- prefix_length_in_bits);
- }
- bool ParseCIDRBlock(base::StringPiece cidr_literal,
- IPAddress* ip_address,
- size_t* prefix_length_in_bits) {
- // We expect CIDR notation to match one of these two templates:
- // <IPv4-literal> "/" <number of bits>
- // <IPv6-literal> "/" <number of bits>
- std::vector<base::StringPiece> parts = base::SplitStringPiece(
- cidr_literal, "/", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
- if (parts.size() != 2)
- return false;
- // Parse the IP address.
- if (!ip_address->AssignFromIPLiteral(parts[0]))
- return false;
- // Parse the prefix length.
- uint32_t number_of_bits;
- if (!ParseUint32(parts[1], &number_of_bits))
- return false;
- // Make sure the prefix length is in a valid range.
- if (number_of_bits > ip_address->size() * 8)
- return false;
- *prefix_length_in_bits = number_of_bits;
- return true;
- }
- bool ParseURLHostnameToAddress(const base::StringPiece& hostname,
- IPAddress* ip_address) {
- if (hostname.size() >= 2 && hostname.front() == '[' &&
- hostname.back() == ']') {
- // Strip the square brackets that surround IPv6 literals.
- auto ip_literal =
- base::StringPiece(hostname).substr(1, hostname.size() - 2);
- return ip_address->AssignFromIPLiteral(ip_literal) && ip_address->IsIPv6();
- }
- return ip_address->AssignFromIPLiteral(hostname) && ip_address->IsIPv4();
- }
- size_t CommonPrefixLength(const IPAddress& a1, const IPAddress& a2) {
- DCHECK_EQ(a1.size(), a2.size());
- for (size_t i = 0; i < a1.size(); ++i) {
- unsigned diff = a1.bytes()[i] ^ a2.bytes()[i];
- if (!diff)
- continue;
- for (unsigned j = 0; j < CHAR_BIT; ++j) {
- if (diff & (1 << (CHAR_BIT - 1)))
- return i * CHAR_BIT + j;
- diff <<= 1;
- }
- NOTREACHED();
- }
- return a1.size() * CHAR_BIT;
- }
- size_t MaskPrefixLength(const IPAddress& mask) {
- base::StackVector<uint8_t, 16> all_ones;
- all_ones->resize(mask.size(), 0xFF);
- return CommonPrefixLength(mask,
- IPAddress(all_ones->data(), all_ones->size()));
- }
- } // namespace net
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