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https://github.com/RGBCube/serenity
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373d135e74
LookupServer can now itself server as a DNS server! To service DNS clients, it uses the exact same lookup logic as it does for LibIPC clients. Namely, it will synthesize records for data from /etc/hosts on its own (you can use this to configure host names for your domain!), and forward other questions to configured upstream DNS servers. On top of that, it implements its own caching, so once a DNS resource record has been obtained from an upstream server, LookupServer will cache it locally for faster future lookups. The DNS server part of LookupServer is disabled by default, because it requires you to run it as root (for it to bind to the port 53) and on boot, and we don't want either by default. If you want to try it, modify SystemServer.ini like so: [LookupServer] Socket=/tmp/portal/lookup SocketPermissions=666 Priority=low KeepAlive=1 User=root BootModes=text,graphical and enable server mode in LookupServer.ini like so: [DNS] Nameservers=... EnableServer=1 If in the future we implement socket takeover for IP sockets, these limitations may be lifted.
109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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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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#pragma once
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#include "DNSAnswer.h"
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#include "DNSQuestion.h"
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#include <AK/Optional.h>
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#include <AK/Types.h>
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#include <AK/Vector.h>
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#define T_A 1
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#define T_NS 2
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#define T_CNAME 5
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#define T_SOA 6
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#define T_PTR 12
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#define T_MX 15
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#define C_IN 1
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namespace LookupServer {
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enum class ShouldRandomizeCase {
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No = 0,
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Yes
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};
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class DNSPacket {
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public:
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DNSPacket() { }
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static Optional<DNSPacket> from_raw_packet(const u8*, size_t);
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ByteBuffer to_byte_buffer() const;
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bool is_query() const { return !m_query_or_response; }
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bool is_response() const { return m_query_or_response; }
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void set_is_query() { m_query_or_response = false; }
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void set_is_response() { m_query_or_response = true; }
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u16 id() const { return m_id; }
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void set_id(u16 id) { m_id = id; }
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const Vector<DNSQuestion>& questions() const { return m_questions; }
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const Vector<DNSAnswer>& answers() const { return m_answers; }
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u16 question_count() const
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{
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ASSERT(m_questions.size() <= UINT16_MAX);
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return m_questions.size();
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}
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u16 answer_count() const
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{
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ASSERT(m_answers.size() <= UINT16_MAX);
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return m_answers.size();
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}
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void add_question(const DNSQuestion&);
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void add_answer(const DNSAnswer&);
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enum class Code : u8 {
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NOERROR = 0,
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FORMERR = 1,
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SERVFAIL = 2,
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NXDOMAIN = 3,
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NOTIMP = 4,
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REFUSED = 5,
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YXDOMAIN = 6,
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XRRSET = 7,
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NOTAUTH = 8,
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NOTZONE = 9,
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};
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Code code() const { return (Code)m_code; }
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void set_code(Code code) { m_code = (u8)code; }
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private:
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u16 m_id { 0 };
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u8 m_code { 0 };
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bool m_query_or_response { false };
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Vector<DNSQuestion> m_questions;
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Vector<DNSAnswer> m_answers;
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};
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}
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