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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.
108 lines
3.2 KiB
C++
108 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 String& name, u16 record_type, ShouldRandomizeCase);
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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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