danicoin/src/Platform/Windows/System/Ipv4Resolver.cpp

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2015-05-27 12:08:46 +00:00
// Copyright (c) 2012-2015, The CryptoNote developers, The Bytecoin developers
//
// This file is part of Bytecoin.
//
// Bytecoin is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Bytecoin is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with Bytecoin. If not, see <http://www.gnu.org/licenses/>.
#include "Ipv4Resolver.h"
#include <cassert>
#include <random>
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN
#endif
#include <ws2tcpip.h>
#include <System/InterruptedException.h>
#include <System/Ipv4Address.h>
namespace System {
Ipv4Resolver::Ipv4Resolver() : dispatcher(nullptr) {
}
Ipv4Resolver::Ipv4Resolver(Dispatcher& dispatcher) : dispatcher(&dispatcher), stopped(false) {
}
Ipv4Resolver::Ipv4Resolver(Ipv4Resolver&& other) : dispatcher(other.dispatcher) {
if (dispatcher != nullptr) {
stopped = other.stopped;
other.dispatcher = nullptr;
}
}
Ipv4Resolver::~Ipv4Resolver() {
}
Ipv4Resolver& Ipv4Resolver::operator=(Ipv4Resolver&& other) {
dispatcher = other.dispatcher;
if (dispatcher != nullptr) {
stopped = other.stopped;
other.dispatcher = nullptr;
}
return *this;
}
void Ipv4Resolver::start() {
assert(dispatcher != nullptr);
assert(stopped);
stopped = false;
}
void Ipv4Resolver::stop() {
assert(dispatcher != nullptr);
assert(!stopped);
stopped = true;
}
Ipv4Address Ipv4Resolver::resolve(const std::string& host) {
assert(dispatcher != nullptr);
if (stopped) {
throw InterruptedException();
}
addrinfo hints = { 0, AF_INET, SOCK_STREAM, IPPROTO_TCP, 0, NULL, NULL, NULL };
addrinfo* addressInfos;
int result = getaddrinfo(host.c_str(), NULL, &hints, &addressInfos);
if (result != 0) {
throw std::runtime_error("Ipv4Resolver::resolve, getaddrinfo failed, result=" + std::to_string(result));
}
std::size_t count = 0;
for (addrinfo* addressInfo = addressInfos; addressInfo != nullptr; addressInfo = addressInfo->ai_next) {
++count;
}
std::mt19937 generator{ std::random_device()() };
std::size_t index = std::uniform_int_distribution<std::size_t>(0, count - 1)(generator);
addrinfo* addressInfo = addressInfos;
for (std::size_t i = 0; i < index; ++i) {
addressInfo = addressInfo->ai_next;
}
Ipv4Address address(ntohl(reinterpret_cast<sockaddr_in*>(addressInfo->ai_addr)->sin_addr.S_un.S_addr));
freeaddrinfo(addressInfo);
return address;
}
}