302 lines
8.7 KiB
C++
302 lines
8.7 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <folly/IPAddressV4.h>
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#include <ostream>
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#include <string>
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#include <folly/Format.h>
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#include <folly/IPAddress.h>
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#include <folly/IPAddressV6.h>
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#include <folly/detail/IPAddressSource.h>
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using std::ostream;
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using std::string;
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namespace folly {
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// free functions
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size_t hash_value(const IPAddressV4& addr) {
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return addr.hash();
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}
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ostream& operator<<(ostream& os, const IPAddressV4& addr) {
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os << addr.str();
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return os;
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}
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void toAppend(IPAddressV4 addr, string* result) {
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result->append(addr.str());
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}
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void toAppend(IPAddressV4 addr, fbstring* result) {
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result->append(addr.str());
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}
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bool IPAddressV4::validate(StringPiece ip) noexcept {
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return tryFromString(ip).hasValue();
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}
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// public static
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IPAddressV4 IPAddressV4::fromLong(uint32_t src) {
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in_addr addr;
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addr.s_addr = src;
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return IPAddressV4(addr);
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}
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IPAddressV4 IPAddressV4::fromLongHBO(uint32_t src) {
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in_addr addr;
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addr.s_addr = htonl(src);
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return IPAddressV4(addr);
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}
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// static public
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uint32_t IPAddressV4::toLong(StringPiece ip) {
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auto str = ip.str();
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in_addr addr;
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if (inet_pton(AF_INET, str.c_str(), &addr) != 1) {
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throw IPAddressFormatException(
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sformat("Can't convert invalid IP '{}' to long", ip));
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}
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return addr.s_addr;
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}
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// static public
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uint32_t IPAddressV4::toLongHBO(StringPiece ip) {
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return ntohl(IPAddressV4::toLong(ip));
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}
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// public default constructor
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IPAddressV4::IPAddressV4() = default;
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// ByteArray4 constructor
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IPAddressV4::IPAddressV4(const ByteArray4& src) noexcept : addr_(src) {}
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// public string constructor
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IPAddressV4::IPAddressV4(StringPiece addr) : addr_() {
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auto maybeIp = tryFromString(addr);
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if (maybeIp.hasError()) {
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throw IPAddressFormatException(
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to<std::string>("Invalid IPv4 address '", addr, "'"));
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}
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*this = maybeIp.value();
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}
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Expected<IPAddressV4, IPAddressFormatError> IPAddressV4::tryFromString(
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StringPiece str) noexcept {
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struct in_addr inAddr;
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if (inet_pton(AF_INET, str.str().c_str(), &inAddr) != 1) {
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return makeUnexpected(IPAddressFormatError::INVALID_IP);
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}
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return IPAddressV4(inAddr);
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}
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// in_addr constructor
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IPAddressV4::IPAddressV4(const in_addr src) noexcept : addr_(src) {}
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IPAddressV4 IPAddressV4::fromBinary(ByteRange bytes) {
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auto maybeIp = tryFromBinary(bytes);
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if (maybeIp.hasError()) {
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throw IPAddressFormatException(to<std::string>(
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"Invalid IPv4 binary data: length must be 4 bytes, got ",
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bytes.size()));
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}
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return maybeIp.value();
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}
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Expected<IPAddressV4, IPAddressFormatError> IPAddressV4::tryFromBinary(
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ByteRange bytes) noexcept {
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IPAddressV4 addr;
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auto setResult = addr.trySetFromBinary(bytes);
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if (setResult.hasError()) {
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return makeUnexpected(setResult.error());
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}
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return addr;
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}
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Expected<Unit, IPAddressFormatError> IPAddressV4::trySetFromBinary(
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ByteRange bytes) noexcept {
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if (bytes.size() != 4) {
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return makeUnexpected(IPAddressFormatError::INVALID_IP);
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}
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memcpy(&addr_.inAddr_.s_addr, bytes.data(), sizeof(in_addr));
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return folly::unit;
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}
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// static
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IPAddressV4 IPAddressV4::fromInverseArpaName(const std::string& arpaname) {
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auto piece = StringPiece(arpaname);
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// input must be something like 1.0.168.192.in-addr.arpa
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if (!piece.removeSuffix(".in-addr.arpa")) {
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throw IPAddressFormatException(
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sformat("input does not end with '.in-addr.arpa': '{}'", arpaname));
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}
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std::vector<StringPiece> pieces;
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split(".", piece, pieces);
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if (pieces.size() != 4) {
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throw IPAddressFormatException(sformat("Invalid input. Got {}", piece));
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}
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// reverse 1.0.168.192 -> 192.168.0.1
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return IPAddressV4(join(".", pieces.rbegin(), pieces.rend()));
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}
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IPAddressV6 IPAddressV4::createIPv6() const {
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ByteArray16 ba{};
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ba[10] = 0xff;
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ba[11] = 0xff;
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std::memcpy(&ba[12], bytes(), 4);
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return IPAddressV6(ba);
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}
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// public
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IPAddressV6 IPAddressV4::getIPv6For6To4() const {
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ByteArray16 ba{};
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ba[0] = (uint8_t)((IPAddressV6::PREFIX_6TO4 & 0xFF00) >> 8);
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ba[1] = (uint8_t)(IPAddressV6::PREFIX_6TO4 & 0x00FF);
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std::memcpy(&ba[2], bytes(), 4);
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return IPAddressV6(ba);
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}
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// public
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string IPAddressV4::toJson() const {
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return sformat("{{family:'AF_INET', addr:'{}', hash:{}}}", str(), hash());
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}
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// public
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bool IPAddressV4::inSubnet(StringPiece cidrNetwork) const {
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auto subnetInfo = IPAddress::createNetwork(cidrNetwork);
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auto addr = subnetInfo.first;
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if (!addr.isV4()) {
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throw IPAddressFormatException(
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sformat("Address '{}' is not a V4 address", addr.toJson()));
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}
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return inSubnetWithMask(addr.asV4(), fetchMask(subnetInfo.second));
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}
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// public
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bool IPAddressV4::inSubnetWithMask(
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const IPAddressV4& subnet,
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const ByteArray4 cidrMask) const {
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const auto mask = detail::Bytes::mask(toByteArray(), cidrMask);
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const auto subMask = detail::Bytes::mask(subnet.toByteArray(), cidrMask);
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return (mask == subMask);
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}
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// public
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bool IPAddressV4::isLoopback() const {
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static IPAddressV4 loopback_addr("127.0.0.0");
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return inSubnetWithMask(loopback_addr, fetchMask(8));
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}
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// public
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bool IPAddressV4::isLinkLocal() const {
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static IPAddressV4 linklocal_addr("169.254.0.0");
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return inSubnetWithMask(linklocal_addr, fetchMask(16));
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}
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// public
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bool IPAddressV4::isNonroutable() const {
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auto ip = toLongHBO();
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return isPrivate() ||
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(/* align */ true && ip <= 0x00FFFFFF) || // 0.0.0.0-0.255.255.255
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(ip >= 0xC0000000 && ip <= 0xC00000FF) || // 192.0.0.0-192.0.0.255
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(ip >= 0xC0000200 && ip <= 0xC00002FF) || // 192.0.2.0-192.0.2.255
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(ip >= 0xC6120000 && ip <= 0xC613FFFF) || // 198.18.0.0-198.19.255.255
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(ip >= 0xC6336400 && ip <= 0xC63364FF) || // 198.51.100.0-198.51.100.255
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(ip >= 0xCB007100 && ip <= 0xCB0071FF) || // 203.0.113.0-203.0.113.255
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(ip >= 0xE0000000 && ip <= 0xFFFFFFFF) || // 224.0.0.0-255.255.255.255
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false;
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}
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// public
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bool IPAddressV4::isPrivate() const {
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auto ip = toLongHBO();
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return // some ranges below
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(ip >= 0x0A000000 && ip <= 0x0AFFFFFF) || // 10.0.0.0-10.255.255.255
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(ip >= 0x7F000000 && ip <= 0x7FFFFFFF) || // 127.0.0.0-127.255.255.255
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(ip >= 0xA9FE0000 && ip <= 0xA9FEFFFF) || // 169.254.0.0-169.254.255.255
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(ip >= 0xAC100000 && ip <= 0xAC1FFFFF) || // 172.16.0.0-172.31.255.255
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(ip >= 0xC0A80000 && ip <= 0xC0A8FFFF) || // 192.168.0.0-192.168.255.255
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false;
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}
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// public
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bool IPAddressV4::isMulticast() const {
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return (toLongHBO() & 0xf0000000) == 0xe0000000;
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}
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// public
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IPAddressV4 IPAddressV4::mask(size_t numBits) const {
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static const auto bits = bitCount();
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if (numBits > bits) {
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throw IPAddressFormatException(
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sformat("numBits({}) > bitsCount({})", numBits, bits));
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}
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ByteArray4 ba = detail::Bytes::mask(fetchMask(numBits), addr_.bytes_);
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return IPAddressV4(ba);
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}
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// public
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string IPAddressV4::str() const {
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return detail::fastIpv4ToString(addr_.inAddr_);
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}
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// public
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void IPAddressV4::toFullyQualifiedAppend(std::string& out) const {
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detail::fastIpv4AppendToString(addr_.inAddr_, out);
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}
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// public
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string IPAddressV4::toInverseArpaName() const {
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return sformat(
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"{}.{}.{}.{}.in-addr.arpa",
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addr_.bytes_[3],
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addr_.bytes_[2],
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addr_.bytes_[1],
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addr_.bytes_[0]);
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}
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// public
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uint8_t IPAddressV4::getNthMSByte(size_t byteIndex) const {
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const auto highestIndex = byteCount() - 1;
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if (byteIndex > highestIndex) {
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throw std::invalid_argument(sformat(
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"Byte index must be <= {} for addresses of type: {}",
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highestIndex,
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detail::familyNameStr(AF_INET)));
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}
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return bytes()[byteIndex];
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}
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// protected
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ByteArray4 IPAddressV4::fetchMask(size_t numBits) {
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static const size_t bits = bitCount();
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if (numBits > bits) {
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throw IPAddressFormatException("IPv4 addresses are 32 bits");
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}
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auto const val = Endian::big(uint32_t(~uint64_t(0) << (32 - numBits)));
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ByteArray4 arr;
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std::memcpy(arr.data(), &val, sizeof(val));
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return arr;
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}
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// public static
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CIDRNetworkV4 IPAddressV4::longestCommonPrefix(
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const CIDRNetworkV4& one,
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const CIDRNetworkV4& two) {
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auto prefix = detail::Bytes::longestCommonPrefix(
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one.first.addr_.bytes_, one.second, two.first.addr_.bytes_, two.second);
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return {IPAddressV4(prefix.first), prefix.second};
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}
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} // namespace folly
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