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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Answer.h"
#include <AK/Stream.h>
#include <LibIPC/Decoder.h>
#include <LibIPC/Encoder.h>
#include <time.h>
namespace DNS {
Answer::Answer(Name const& name, RecordType type, RecordClass class_code, u32 ttl, String const& record_data, bool mdns_cache_flush)
: m_name(name)
, m_type(type)
, m_class_code(class_code)
, m_ttl(ttl)
, m_record_data(record_data)
, m_mdns_cache_flush(mdns_cache_flush)
{
time(&m_received_time);
}
bool Answer::has_expired() const
{
return time(nullptr) >= m_received_time + m_ttl;
}
unsigned Answer::hash() const
{
auto hash = pair_int_hash(CaseInsensitiveStringTraits::hash(name().as_string()), (u32)type());
hash = pair_int_hash(hash, pair_int_hash((u32)class_code(), ttl()));
hash = pair_int_hash(hash, record_data().hash());
hash = pair_int_hash(hash, (u32)mdns_cache_flush());
return hash;
}
bool Answer::operator==(Answer const& other) const
{
if (&other == this)
return true;
if (!Name::Traits::equals(name(), other.name()))
return false;
if (type() != other.type())
return false;
if (class_code() != other.class_code())
return false;
if (ttl() != other.ttl())
return false;
if (record_data() != other.record_data())
return false;
if (mdns_cache_flush() != other.mdns_cache_flush())
return false;
return true;
}
}
ErrorOr<void> AK::Formatter<DNS::RecordType>::format(AK::FormatBuilder& builder, DNS::RecordType value)
{
switch (value) {
case DNS::RecordType::A:
return builder.put_string("A"sv);
case DNS::RecordType::NS:
return builder.put_string("NS"sv);
case DNS::RecordType::CNAME:
return builder.put_string("CNAME"sv);
case DNS::RecordType::SOA:
return builder.put_string("SOA"sv);
case DNS::RecordType::PTR:
return builder.put_string("PTR"sv);
case DNS::RecordType::MX:
return builder.put_string("MX"sv);
case DNS::RecordType::TXT:
return builder.put_string("TXT"sv);
case DNS::RecordType::AAAA:
return builder.put_string("AAAA"sv);
case DNS::RecordType::SRV:
return builder.put_string("SRV"sv);
}
TRY(builder.put_string("DNS record type "sv));
TRY(builder.put_u64((u16)value));
return {};
}
ErrorOr<void> AK::Formatter<DNS::RecordClass>::format(AK::FormatBuilder& builder, DNS::RecordClass value)
{
switch (value) {
case DNS::RecordClass::IN:
return builder.put_string("IN"sv);
}
TRY(builder.put_string("DNS record class "sv));
TRY(builder.put_u64((u16)value));
return {};
}
namespace IPC {
template<>
bool encode(Encoder& encoder, DNS::Answer const& answer)
{
encoder << answer.name().as_string() << (u16)answer.type() << (u16)answer.class_code() << answer.ttl() << answer.record_data() << answer.mdns_cache_flush();
return true;
}
template<>
ErrorOr<void> decode(Decoder& decoder, DNS::Answer& answer)
{
String name;
TRY(decoder.decode(name));
u16 record_type, class_code;
TRY(decoder.decode(record_type));
TRY(decoder.decode(class_code));
u32 ttl;
TRY(decoder.decode(ttl));
String record_data;
TRY(decoder.decode(record_data));
bool cache_flush;
TRY(decoder.decode(cache_flush));
answer = { { name }, (DNS::RecordType)record_type, (DNS::RecordClass)class_code, ttl, record_data, cache_flush };
return {};
}
}
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