mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-21 10:19:03 +03:00
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.
99 lines
3.3 KiB
C++
99 lines
3.3 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "DNSRequest.h"
|
|
#include "DNSPacket.h"
|
|
#include <AK/BufferStream.h>
|
|
#include <AK/StringBuilder.h>
|
|
#include <arpa/inet.h>
|
|
#include <ctype.h>
|
|
#include <stdlib.h>
|
|
|
|
#define C_IN 1
|
|
|
|
DNSRequest::DNSRequest()
|
|
: m_id(arc4random_uniform(UINT16_MAX))
|
|
{
|
|
}
|
|
|
|
void DNSRequest::add_question(const String& name, u16 record_type, ShouldRandomizeCase should_randomize_case)
|
|
{
|
|
ASSERT(m_questions.size() <= UINT16_MAX);
|
|
|
|
if (name.is_empty())
|
|
return;
|
|
|
|
StringBuilder builder;
|
|
for (size_t i = 0; i < name.length(); ++i) {
|
|
u8 ch = name[i];
|
|
if (should_randomize_case == ShouldRandomizeCase::Yes) {
|
|
// Randomize the 0x20 bit in every ASCII character.
|
|
if (isalpha(ch)) {
|
|
if (arc4random_uniform(2))
|
|
ch |= 0x20;
|
|
else
|
|
ch &= ~0x20;
|
|
}
|
|
}
|
|
builder.append(ch);
|
|
}
|
|
|
|
if (name[name.length() - 1] != '.')
|
|
builder.append('.');
|
|
|
|
m_questions.empend(builder.to_string(), record_type, C_IN);
|
|
}
|
|
|
|
ByteBuffer DNSRequest::to_byte_buffer() const
|
|
{
|
|
DNSPacket request_header;
|
|
request_header.set_id(m_id);
|
|
request_header.set_is_query();
|
|
request_header.set_opcode(0);
|
|
request_header.set_truncated(false);
|
|
request_header.set_recursion_desired(true);
|
|
request_header.set_question_count(m_questions.size());
|
|
|
|
auto buffer = ByteBuffer::create_uninitialized(m_questions.size() * 4096);
|
|
BufferStream stream(buffer);
|
|
|
|
stream << ByteBuffer::wrap(&request_header, sizeof(request_header));
|
|
|
|
for (auto& question : m_questions) {
|
|
auto parts = question.name().split('.');
|
|
for (auto& part : parts) {
|
|
stream << (u8)part.length();
|
|
stream << part;
|
|
}
|
|
stream << '\0';
|
|
stream << htons(question.record_type());
|
|
stream << htons(question.class_code());
|
|
}
|
|
stream.snip();
|
|
|
|
return buffer;
|
|
}
|