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https://github.com/RGBCube/serenity
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1dad63824b
They're really the same thing: a DNS packet can contain both questions and answers, and there's a single bit in the header that determines whether the packet represents a query or a response. It'll be simpler for us to represent both types of packets using the same class. This class can be both serialized and deserialized to/from a raw DNS packet.
74 lines
3 KiB
C++
74 lines
3 KiB
C++
/*
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* Copyright (c) 2021, Sergey Bugaev <bugaevc@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "ClientConnection.h"
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#include "DNSPacket.h"
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#include "LookupServer.h"
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#include <AK/IPv4Address.h>
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namespace LookupServer {
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static HashMap<int, RefPtr<ClientConnection>> s_connections;
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ClientConnection::ClientConnection(AK::NonnullRefPtr<Core::LocalSocket> socket, int client_id)
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: IPC::ClientConnection<LookupClientEndpoint, LookupServerEndpoint>(*this, move(socket), client_id)
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{
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s_connections.set(client_id, *this);
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}
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ClientConnection::~ClientConnection()
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{
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}
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void ClientConnection::die()
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{
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s_connections.remove(client_id());
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}
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OwnPtr<Messages::LookupServer::LookupNameResponse> ClientConnection::handle(const Messages::LookupServer::LookupName& message)
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{
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auto addresses = LookupServer::the().lookup(message.name(), T_A);
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if (addresses.is_empty())
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return make<Messages::LookupServer::LookupNameResponse>(1, Vector<String>());
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return make<Messages::LookupServer::LookupNameResponse>(0, move(addresses));
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}
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OwnPtr<Messages::LookupServer::LookupAddressResponse> ClientConnection::handle(const Messages::LookupServer::LookupAddress& message)
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{
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if (message.address().length() != 4)
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return make<Messages::LookupServer::LookupAddressResponse>(1, String());
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IPv4Address address { (const u8*)message.address().characters() };
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auto name = String::formatted("{}.{}.{}.{}.in-addr.arpa",
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address[3],
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address[2],
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address[1],
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address[0]);
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auto hosts = LookupServer::the().lookup(name, T_PTR);
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if (hosts.is_empty())
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return make<Messages::LookupServer::LookupAddressResponse>(1, String());
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return make<Messages::LookupServer::LookupAddressResponse>(0, hosts[0]);
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}
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}
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