98 lines
2.7 KiB
C++
Executable file
98 lines
2.7 KiB
C++
Executable file
// 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>
|
|
#include <stdexcept>
|
|
|
|
#include <netdb.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_addr));
|
|
freeaddrinfo(addressInfo);
|
|
return address;
|
|
}
|
|
|
|
}
|