99 lines
2.7 KiB
C++
99 lines
2.7 KiB
C++
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// Copyright (c) 2012-2015, The CryptoNote developers, The Bytecoin developers
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//
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// This file is part of Bytecoin.
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//
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// Bytecoin is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Bytecoin is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with Bytecoin. If not, see <http://www.gnu.org/licenses/>.
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#include "Ipv4Resolver.h"
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#include <cassert>
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#include <random>
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#include <stdexcept>
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#include <netdb.h>
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#include <System/InterruptedException.h>
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#include <System/Ipv4Address.h>
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namespace System {
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Ipv4Resolver::Ipv4Resolver() : dispatcher(nullptr) {
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}
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Ipv4Resolver::Ipv4Resolver(Dispatcher& dispatcher) : dispatcher(&dispatcher), stopped(false) {
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}
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Ipv4Resolver::Ipv4Resolver(Ipv4Resolver&& other) : dispatcher(other.dispatcher) {
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if (dispatcher != nullptr) {
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stopped = other.stopped;
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other.dispatcher = nullptr;
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}
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}
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Ipv4Resolver::~Ipv4Resolver() {
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}
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Ipv4Resolver& Ipv4Resolver::operator=(Ipv4Resolver&& other) {
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dispatcher = other.dispatcher;
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if (dispatcher != nullptr) {
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stopped = other.stopped;
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other.dispatcher = nullptr;
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}
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return *this;
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}
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void Ipv4Resolver::start() {
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assert(dispatcher != nullptr);
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assert(stopped);
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stopped = false;
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}
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void Ipv4Resolver::stop() {
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assert(dispatcher != nullptr);
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assert(!stopped);
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stopped = true;
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}
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Ipv4Address Ipv4Resolver::resolve(const std::string& host) {
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assert(dispatcher != nullptr);
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if (stopped) {
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throw InterruptedException();
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}
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addrinfo hints = { 0, AF_INET, SOCK_STREAM, IPPROTO_TCP, 0, NULL, NULL, NULL };
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addrinfo* addressInfos;
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int result = getaddrinfo(host.c_str(), NULL, &hints, &addressInfos);
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if (result != 0) {
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throw std::runtime_error("Ipv4Resolver::resolve, getaddrinfo failed, result=" + std::to_string(result));
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}
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std::size_t count = 0;
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for (addrinfo* addressInfo = addressInfos; addressInfo != nullptr; addressInfo = addressInfo->ai_next) {
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++count;
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}
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std::mt19937 generator{ std::random_device()() };
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std::size_t index = std::uniform_int_distribution<std::size_t>(0, count - 1)(generator);
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addrinfo* addressInfo = addressInfos;
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for (std::size_t i = 0; i < index; ++i) {
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addressInfo = addressInfo->ai_next;
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}
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Ipv4Address address(ntohl(reinterpret_cast<sockaddr_in*>(addressInfo->ai_addr)->sin_addr.s_addr));
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freeaddrinfo(addressInfo);
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return address;
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}
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}
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