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/*
* Copyright (C) 2009 Apple Inc. All Rights Reserved.
* Copyright (C) 2012, 2018 Igalia S.L.
*
* 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 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
* 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 "DNS.h"
#include "DNSResolveQueue.h"
#include <wtf/CompletionHandler.h>
#include <wtf/MainThread.h>
#if OS(UNIX)
#include <arpa/inet.h>
#endif
namespace WebCore {
void prefetchDNS(const String& hostname)
{
ASSERT(isMainThread());
if (hostname.isEmpty())
return;
DNSResolveQueue::singleton().add(hostname);
}
void resolveDNS(const String& hostname, uint64_t identifier, DNSCompletionHandler&& completionHandler)
{
ASSERT(isMainThread());
if (hostname.isEmpty())
return completionHandler(makeUnexpected(DNSError::CannotResolve));
WebCore::DNSResolveQueue::singleton().resolve(hostname, identifier, WTFMove(completionHandler));
}
void stopResolveDNS(uint64_t identifier)
{
WebCore::DNSResolveQueue::singleton().stopResolve(identifier);
}
bool IPAddress::containsOnlyZeros() const
{
return std::visit(WTF::makeVisitor([] (const WTF::HashTableEmptyValueType&) {
ASSERT_NOT_REACHED();
return false;
}, [] (const in_addr& address) {
return !address.s_addr;
}, [] (const in6_addr& address) {
for (uint8_t byte : address.s6_addr) {
if (byte)
return false;
}
return true;
}), m_address);
}
std::optional<IPAddress> IPAddress::fromString(const String& string)
{
#if OS(UNIX)
struct in6_addr addressV6;
if (inet_pton(AF_INET6, string.utf8().data(), &addressV6))
return IPAddress { addressV6 };
struct in_addr addressV4;
if (inet_pton(AF_INET, string.utf8().data(), &addressV4))
return IPAddress { addressV4 };
#else
// FIXME: Add support for this method on Windows.
UNUSED_PARAM(string);
#endif
return std::nullopt;
}
IPAddress IPAddress::isolatedCopy() const
{
if (isIPv4())
return IPAddress { ipv4Address() };
if (isIPv6())
return IPAddress { ipv6Address() };
RELEASE_ASSERT_NOT_REACHED();
return IPAddress { WTF::HashTableEmptyValue };
}
unsigned IPAddress::matchingNetMaskLength(const IPAddress& other) const
{
const unsigned char* addressData = nullptr;
const unsigned char* otherAddressData = nullptr;
size_t addressLengthInBytes = 0;
if (isIPv4() && other.isIPv4()) {
addressLengthInBytes = sizeof(struct in_addr);
addressData = reinterpret_cast<const unsigned char*>(&ipv4Address());
otherAddressData = reinterpret_cast<const unsigned char*>(&other.ipv4Address());
} else if (isIPv6() && other.isIPv6()) {
addressLengthInBytes = sizeof(struct in6_addr);
addressData = reinterpret_cast<const unsigned char*>(&ipv6Address());
otherAddressData = reinterpret_cast<const unsigned char*>(&other.ipv6Address());
} else
return 0;
std::optional<size_t> firstNonMatchingIndex;
unsigned matchingBits = 0;
for (size_t i = 0; i < addressLengthInBytes; ++i) {
if (addressData[i] != otherAddressData[i]) {
firstNonMatchingIndex = i;
break;
}
matchingBits += 8;
}
if (firstNonMatchingIndex) {
// Count the number of matching leading bits in the first byte that is different between the two addresses.
// For instance, 0xF2 and 0xF3 would have 7 matching bits.
matchingBits += clz<unsigned char>(addressData[*firstNonMatchingIndex] ^ otherAddressData[*firstNonMatchingIndex]);
}
return matchingBits;
}
}
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