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cf3b58fbe8
It didn't feel right to have a "DHCPClient" in a "Servers" directory. Rename this to Services to better reflect the type of programs we'll be putting in there.
98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@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 "DNSRequest.h"
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#include "DNSPacket.h"
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#include <AK/BufferStream.h>
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#include <AK/StringBuilder.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <stdlib.h>
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#define C_IN 1
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DNSRequest::DNSRequest()
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: m_id(arc4random_uniform(UINT16_MAX))
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{
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}
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void DNSRequest::add_question(const String& name, u16 record_type, ShouldRandomizeCase should_randomize_case)
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{
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ASSERT(m_questions.size() <= UINT16_MAX);
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if (name.is_empty())
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return;
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StringBuilder builder;
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for (size_t i = 0; i < name.length(); ++i) {
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u8 ch = name[i];
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if (should_randomize_case == ShouldRandomizeCase::Yes) {
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// Randomize the 0x20 bit in every ASCII character.
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if (isalpha(ch)) {
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if (arc4random_uniform(2))
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ch |= 0x20;
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else
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ch &= ~0x20;
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}
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}
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builder.append(ch);
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}
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if (name[name.length() - 1] != '.')
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builder.append('.');
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m_questions.empend(builder.to_string(), record_type, C_IN);
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}
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ByteBuffer DNSRequest::to_byte_buffer() const
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{
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DNSPacket request_header;
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request_header.set_id(m_id);
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request_header.set_is_query();
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request_header.set_opcode(0);
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request_header.set_truncated(false);
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request_header.set_recursion_desired(true);
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request_header.set_question_count(m_questions.size());
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auto buffer = ByteBuffer::create_uninitialized(m_questions.size() * 4096);
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BufferStream stream(buffer);
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stream << ByteBuffer::wrap(&request_header, sizeof(request_header));
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for (auto& question : m_questions) {
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auto parts = question.name().split('.');
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for (auto& part : parts) {
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stream << (u8)part.length();
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stream << part;
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}
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stream << '\0';
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stream << htons(question.record_type());
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stream << htons(question.class_code());
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}
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stream.snip();
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return buffer;
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}
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