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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "IPAddressSpace.h"
#include <array>
#include <cstdio>
#include <wtf/URL.h>
#include <wtf/Vector.h>
#include <wtf/text/MakeString.h>
#include <wtf/text/StringToIntegerConversion.h>
#include <wtf/text/StringView.h>
namespace WebCore {
IPAddressSpace determineIPAddressSpace(const URL& url)
{
// Defined in https://wicg.github.io/local-network-access/#ip-address-space-section
String host = url.host().toString();
host = makeStringByReplacingAll(host, '[', ""_s);
host = makeStringByReplacingAll(host, ']', ""_s);
if (!URL::hostIsIPAddress(host))
return IPAddressSpace::Public;
// Handle IPv6 addresses (check for colon to distinguish from IPv4)
if (host.contains(':')) {
// ::1/128 - IPv6 Local - loopback
if (host == "::1")
return IPAddressSpace::Local;
// fc00::/7 - Unique Loopback - local
if (host.startsWith("fc"_s) || host.startsWith("fd"_s))
return IPAddressSpace::Local;
// fe80::/10 - Link-Loopback Unicast - local
if (host.startsWith("fe8"_s) || host.startsWith("fe9"_s) || host.startsWith("fea"_s) || host.startsWith("feb"_s))
return IPAddressSpace::Local;
// ::ffff: - IPv4 Mapped IPv6 Addresses - format for parsing by IPv4 Algorithm.
if (host.startsWith("::ffff:"_s)) {
host = host.substring(7);
if (!host.contains('.')) {
// Parse hex representation like "c0a8:101" -> "192.168.1.1"
Vector<String> halves = host.split(':');
if (halves.size() != 2)
return IPAddressSpace::Public;
auto value1 = parseInteger<uint16_t>(halves[0], 16);
auto value2 = parseInteger<uint16_t>(halves[1], 16);
if (!value1.has_value() || !value2.has_value())
return IPAddressSpace::Public;
// Convert 16-bit hex values to dotted decimal IPv4 format
uint16_t val1 = *value1;
uint16_t val2 = *value2;
host = makeString(
static_cast<unsigned>(val1 >> 8), '.',
static_cast<unsigned>(val1 & 0xFF), '.',
static_cast<unsigned>(val2 >> 8), '.',
static_cast<unsigned>(val2 & 0xFF)
);
}
}
}
if (host.contains('.')) {
Vector<String> octets = host.split('.');
if (octets.size() != 4)
return IPAddressSpace::Public;
std::array<uint8_t, 4> parts;
for (size_t i = 0; i < 4; i++) {
auto value = parseInteger<uint8_t>(octets[i]);
if (!value)
return IPAddressSpace::Public;
parts[i] = *value;
}
// Check IPv4 address blocks according to spec table:
// 127.0.0.0/8 - IPv4 Loopback - loopback
if (parts[0] == 127)
return IPAddressSpace::Local;
// 10.0.0.0/8 - Local Use - local
if (parts[0] == 10)
return IPAddressSpace::Local;
// 100.64.0.0/10 - Carrier-Grade NAT - local
if (parts[0] == 100 && (parts[1] & 0xC0) == 64)
return IPAddressSpace::Local;
// 172.16.0.0/12 - Local Use - local
if (parts[0] == 172 && (parts[1] & 0xF0) == 16)
return IPAddressSpace::Local;
// 192.168.0.0/16 - Local Use - local
if (parts[0] == 192 && parts[1] == 168)
return IPAddressSpace::Local;
// 198.18.0.0/15 - Benchmarking - local
if (parts[0] == 198 && (parts[1] & 0xFE) == 18)
return IPAddressSpace::Local;
// 169.254.0.0/16 - Link Local - local
if (parts[0] == 169 && parts[1] == 254)
return IPAddressSpace::Local;
return IPAddressSpace::Public;
}
return IPAddressSpace::Public;
}
bool isLocalIPAddressSpace(const URL& url)
{
return determineIPAddressSpace(url) == IPAddressSpace::Local;
}
} // namespace WebCore
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